CN112512824B - On-press developable lithographic printing plate precursor, method for producing lithographic printing plate, and lithographic printing method - Google Patents

On-press developable lithographic printing plate precursor, method for producing lithographic printing plate, and lithographic printing method Download PDF

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CN112512824B
CN112512824B CN201980050526.1A CN201980050526A CN112512824B CN 112512824 B CN112512824 B CN 112512824B CN 201980050526 A CN201980050526 A CN 201980050526A CN 112512824 B CN112512824 B CN 112512824B
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lithographic printing
printing plate
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plate precursor
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CN112512824A (en
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野越启介
荒木健次郎
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Fujifilm Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • B41C1/1008—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials
    • B41C1/1016—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials characterised by structural details, e.g. protective layers, backcoat layers or several imaging layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/06—Lithographic printing
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
    • G03F7/028—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with photosensitivity-increasing substances, e.g. photoinitiators
    • G03F7/029—Inorganic compounds; Onium compounds; Organic compounds having hetero atoms other than oxygen, nitrogen or sulfur
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
    • G03F7/032—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders
    • G03F7/033—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders the binders being polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
    • G03F7/11—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having cover layers or intermediate layers, e.g. subbing layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2201/00—Location, type or constituents of the non-imaging layers in lithographic printing formes
    • B41C2201/02—Cover layers; Protective layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2201/00—Location, type or constituents of the non-imaging layers in lithographic printing formes
    • B41C2201/10—Location, type or constituents of the non-imaging layers in lithographic printing formes characterised by inorganic compounds, e.g. pigments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2201/00—Location, type or constituents of the non-imaging layers in lithographic printing formes
    • B41C2201/14—Location, type or constituents of the non-imaging layers in lithographic printing formes characterised by macromolecular organic compounds, e.g. binder, adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/04—Negative working, i.e. the non-exposed (non-imaged) areas are removed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/08—Developable by water or the fountain solution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/24—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by a macromolecular compound or binder obtained by reactions involving carbon-to-carbon unsaturated bonds, e.g. acrylics, vinyl polymers

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermal Sciences (AREA)
  • Optics & Photonics (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Materials For Photolithography (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Printing Methods (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Abstract

The invention provides an on-press development type lithographic printing plate precursor, a method for manufacturing a lithographic printing plate using the on-press development type lithographic printing plate precursor, and a lithographic printing method using the on-press development type lithographic printing plate precursor, wherein the on-press development type lithographic printing plate precursor comprises a support, an image recording layer and an overcoat layer in this order, the image recording layer comprises a binder polymer and an electron donating polymerization initiator, the binder polymer comprises a structural unit formed from an aromatic vinyl compound and a structural unit formed from an acrylonitrile compound, and the film thickness of the overcoat layer is thicker than the film thickness of the image recording layer.

Description

On-press developable lithographic printing plate precursor, method for producing lithographic printing plate, and lithographic printing method
Technical Field
The present invention relates to an on-press developable lithographic printing plate precursor, a method for producing a lithographic printing plate, and a lithographic printing method.
Background
In general, a lithographic printing plate is composed of an oleophilic image portion that receives ink during printing and a hydrophilic non-image portion that receives fountain solution. The lithographic printing is a method of performing printing by using the property that water and oil-based ink repel each other, using an oleophilic image portion of a lithographic printing plate as an ink-receiving portion and a hydrophilic non-image portion as a fountain solution-receiving portion (ink-non-receiving portion), causing a difference in ink adhesion on the surface of the lithographic printing plate, allowing ink to adhere only to the image portion, and then transferring the ink onto a printing medium such as paper.
In order to produce such a lithographic printing plate, a lithographic printing plate precursor (PS plate) in which an oleophilic photosensitive resin layer (image recording layer) is provided on a hydrophilic support has been widely used. In general, a lithographic printing plate is obtained by exposing an original image such as a high contrast film to light, leaving a portion of the image portion to be an image recording layer, removing the remaining unnecessary image recording layer by dissolving it in an alkaline developer or an organic solvent to expose the surface of a hydrophilic support, and performing plate making by a method of forming a non-image portion.
Further, since the global environment is being increasingly concerned, environmental problems associated with waste liquid accompanying wet treatment such as development treatment become apparent.
In order to solve the above environmental problems, development and plate making have been simplified and have not been treated. As one of the simple manufacturing methods, a method called "on-press development" is performed. That is, a method is used in which after exposure of a lithographic printing plate precursor, the lithographic printing plate precursor is directly mounted on a printing press without conventional development, and unnecessary portions of an image recording layer are removed at an initial stage of a normal printing process.
In the present invention, a lithographic printing plate precursor that can be used for such on-press development is referred to as an "on-press development type lithographic printing plate precursor".
As conventional lithographic printing plate precursors or printing methods using lithographic printing plate precursors, for example, the contents described in patent documents 1 to 3 can be cited.
Patent document 1 describes a negative-working lithographic printing plate precursor having a support and an image recording layer containing a compound having a repeating unit represented by general formula (1) below and a radical polymerization initiator.
[ chemical formula 1]
General formula (1)
Figure GDA0002921369300000021
In the general formula (1), A represents a single bond or a divalent linking group. Ar represents a benzene nucleus or a naphthalene nucleus. R 1 Represents a hydroxyl group, an alkyl group or an aryl group. i represents an integer of 0 to 3. When i represents an integer of 2 or more, a plurality of R's are present 1 May be the same or different. R 2 Represents a hydrogen atom, an alkyl group or an aryl group. L represents-O-, OCO-, or-OCONH-. * Indicates a site bonded to Ar. * Denotes a site bonded to Y. Y represents a (m + 1) -valent linking group. X represents a (meth) acryloyloxy group.
l represents an integer of 0 or 1. m represents an integer of 1 or 2. Wherein, in the case where l is 0, m is 1.n represents an integer of 1 or 2.
Patent document 2 describes an image-forming element including a substrate having thereon an image-forming layer containing a radical polymerizable component, an initiator composition, an infrared absorbing cyanine dye having a methine chain to which a heterocyclic group is bonded (wherein the methine chain has a chain length of at least 7 carbon atoms), and a primary polymer binder, and an overcoat layer disposed on the image-forming layer, the overcoat layer being mainly composed of poly (vinyl alcohol) having a degree of hydrolysis of 85% or less, wherein the initiator composition is capable of generating radicals sufficient to initiate polymerization of the radical polymerizable group by exposure to an image-forming radiation and contains diaryliodonium borate.
Patent document 3 describes a negative-working lithographic printing plate precursor comprising: a substrate; a negative image forming layer disposed on the substrate and including a radical polymerizable component, an initiator composition capable of generating radicals when exposed to imaging radiation light, a radiation light absorber, and a polymer binder; and an outermost water-soluble overcoat layer disposed directly on the negative image-forming layer and comprising (1) one or more film-forming water-soluble polymer binders present and (2) organic paraffin particles dispersed in the one or more film-forming water-soluble polymer binders in an amount of at least 1.3 wt% and at most 60 wt% based on the total outermost water-soluble overcoat layer weight, wherein the organic paraffin particles have an average maximum dimension of at least 0.05 μm and at most 0.7 μm as measured from a scanning electron micrograph of the dried outermost water-soluble overcoat layer.
Patent document 1: japanese patent laid-open publication No. 2017-132227
Patent document 2: japanese Kohyo publication No. 2010-529490
Patent document 3: japanese table 2015-519610
Disclosure of Invention
Technical problem to be solved by the invention
In printing using a lithographic printing plate, a plate surface is cleaned with a plate cleaner or the like during printing, for example. Therefore, there is a demand for an on-press developable lithographic printing plate precursor that can obtain a lithographic printing plate having excellent chemical resistance to chemicals such as a plate cleaner.
The present inventors have found that the chemical resistance of the lithographic printing plate precursor of the present invention (hereinafter, also referred to simply as "lithographic printing plate precursor") can be further improved as compared with the lithographic printing plate precursors described in patent documents 1 to 3.
An object to be solved by the embodiments of the present invention is to provide an on-press developable lithographic printing plate precursor capable of obtaining a lithographic printing plate excellent in chemical resistance, a method for producing a lithographic printing plate using the on-press developable lithographic printing plate precursor, and a lithographic printing method using the on-press developable lithographic printing plate precursor.
Means for solving the technical problem
The means for solving the above problems include the following means.
< 1 > an on-press developable lithographic printing plate precursor comprising, in order, a support, an image-recording layer and an overcoat layer,
the image recording layer contains a binder polymer and an electron-donating polymerization initiator,
the binder polymer has a structural unit composed of an aromatic vinyl compound and a structural unit composed of an acrylonitrile compound,
the overcoat layer has a film thickness larger than that of the image recording layer.
< 2 > the on-press development type lithographic printing plate precursor according to the above < 1 >, wherein the image recording layer further comprises a polymerizable compound, and a content of the binder polymer in the image recording layer is more than 0 mass% and 400 mass% or less with respect to a total mass of the polymerizable compound.
< 3 > the on-press developable lithographic printing plate precursor according to the above < 1 > or < 2 >, wherein the above overcoat layer contains a water-soluble polymer.
< 4 > the on-press developable lithographic printing plate precursor according to the above < 3 >, wherein the water-soluble polymer comprises polyvinyl alcohol having a saponification degree of 50% or more.
< 5 > the on-press developable lithographic printing plate precursor according to any one of the above < 1 > to < 4 >, wherein the above electron-donating polymerization initiator is a borate compound.
< 6 > the on-press developable lithographic printing plate precursor according to any one of the above < 1 > to < 5 >, wherein the above electron-donating polymerization initiator is a tetraarylborate compound.
< 7 > the on-press developable lithographic printing plate precursor according to any one of the above < 1 > to < 6 >, wherein the above electron donating polymerization initiator is a tetraphenylborate compound.
< 8 > the on-press developable lithographic printing plate precursor according to any one of the above < 1 > to < 7 >, wherein the electron donating polymerization initiator has a maximum occupied molecular orbital of-6.0 eV or more.
< 9 > the on-press developable lithographic printing plate precursor according to any one of the above < 1 > to < 8 >, wherein the above image recording layer further contains an electron accepting polymerization initiator.
< 10 > the on-press developable lithographic printing plate precursor according to < 9 > above, wherein the electron accepting polymerization initiator is an onium compound.
< 11 > the on-press developable lithographic printing plate precursor according to the above < 9 > or < 10 >, wherein the electron accepting polymerization initiator has a lowest unoccupied molecular orbital of-3.0 eV or less.
< 12 > the on-press developable lithographic printing plate precursor according to any one of the above < 9 > to < 11 >, wherein the above electron accepting polymerization initiator and the above electron donating polymerization initiator form a salt.
< 13 > the on-press developable lithographic printing plate precursor according to any one of the above < 9 > to < 12 > comprising an iodonium borate compound as the above electron accepting polymerization initiator and the above electron donating polymerization initiator.
< 14 > the on-press developable lithographic printing plate precursor according to any one of the above < 1 > to < 13 >, wherein the above binder polymer further has a structural unit formed from N-vinylpyrrolidone.
< 15 > the on-press developable lithographic printing plate precursor according to any one of the above < 1 > to < 14 >, wherein the above image recording layer further comprises an infrared absorber.
< 16 > the on-press developable lithographic printing plate precursor according to the above < 15 >, wherein the infrared absorber is an infrared absorber decomposed by infrared exposure.
< 17 > the on-press developable lithographic printing plate precursor according to the above < 15 > or < 16 >, wherein the infrared absorber is an infrared absorber decomposed by heat, electron transfer or both of the heat and the electron transfer due to infrared exposure.
< 18 > the on-press developable lithographic printing plate precursor according to any one of the above < 15 > to < 17 >, wherein the infrared absorber is a cyanine dye.
< 19 > the on-press developable lithographic printing plate precursor according to any one of the above < 15 > to < 18 >, wherein the infrared absorber is a compound represented by the following formula 1.
[ chemical formula 2]
Figure GDA0002921369300000051
In the formula 1, R 1 Represents R by infrared ray exposure 1 -L bond-breaking group, R 11 ～R 18 Independently represent a hydrogen atom, a halogen atom, -Ra, -ORb, -SRc or-NRdRe, ra to Re independently represent a hydrocarbon group, A 1 、A 2 And a plurality of R 11 ～R 18 May be linked to form a monocyclic or polycyclic ring, A 1 And A 2 Each independently represents an oxygen atom, a sulfur atom or a nitrogen atom, n 11 And n 12 Each independently represents an integer of 0 to 5, wherein n 11 And n 12 Is 2 or more, n 13 And n 14 Each independently represents 0 or 1,L represents an oxygen atom, a sulfur atom or-NR 10 -，R 10 Represents a hydrogen atom, an alkyl group or an aryl group, and Za represents a counter ion for neutralizing a charge.
< 20 > the on-press developable lithographic printing plate precursor according to the above < 19 >, wherein R in the above formula 1 1 Is a group represented by the following formula 2.
[ chemical formula 3]
Figure GDA0002921369300000052
In the formula 2, R Z Represents an alkyl group, and the wavy line moiety represents a bonding site with a group represented by L in the above formula 1.
< 21 > a method of making a lithographic printing plate, the method comprising: image-wise exposing the on-press development type lithographic printing plate precursor described in any of the above-mentioned < 1 > to < 20 >; and
and a step of supplying at least one selected from the group consisting of printing ink and dampening solution to the printing press to remove the image recording layer of the non-image portion.
< 22 > a lithographic method, said method comprising: image-wise exposing the on-press development type lithographic printing plate precursor described in any of the above-mentioned < 1 > to < 20 >;
a step of supplying at least one selected from the group consisting of printing ink and dampening solution, and removing the image recording layer of the non-image portion on the printing press to produce a lithographic printing plate; and
and a step of performing printing using the obtained lithographic printing plate.
Effects of the invention
According to the embodiments of the present invention, it is possible to provide an on-press development type lithographic printing plate precursor capable of obtaining a lithographic printing plate excellent in chemical resistance, a method for manufacturing a lithographic printing plate using the on-press development type lithographic printing plate precursor, and a lithographic printing method using the on-press development type lithographic printing plate precursor.
Detailed Description
The present invention will be described in detail below. The following description of the constituent elements is made in accordance with the exemplary embodiments of the present invention, but the present invention is not limited to such embodiments.
In the present specification, "to" indicating a numerical range is used in a meaning including numerical values described before and after the range as a lower limit value and an upper limit value.
Also, in the expression of a group (atomic group) in the present specification, the expression not labeled with substituted and unsubstituted includes a group having no substituent and also includes a group having a substituent. For example, "alkyl group" includes not only an alkyl group having no substituent (unsubstituted alkyl group) but also an alkyl group having a substituent (substituted alkyl group).
In the present specification, "(meth) acrylic acid" is a term used as a concept including both acrylic acid and methacrylic acid, and "(meth) acryloyl group" is a term used as a concept including both acryloyl group and methacryloyl group.
The term "step" in the present specification includes not only an independent step but also a step that can achieve the intended purpose of the step even when the step cannot be clearly distinguished from other steps. In the present invention, "mass%" means the same as "weight%" and "parts by mass" means the same as "parts by weight".
In the present invention, each component in the composition or each structural unit in the polymer may contain one kind or two or more kinds of the components or the structural units may be used simultaneously unless otherwise specified.
Further, in the present invention, in the case where there are a plurality of substances or structural units corresponding to each component in the composition or each structural unit in the polymer, unless otherwise specified, the amount of each structural unit in each component or polymer in the composition means the total amount of the corresponding plurality of substances present in the composition or the corresponding plurality of each structural units present in the polymer.
In the present invention, a combination of 2 or more preferred embodiments is a more preferred embodiment.
The weight average molecular weight (Mw) and the number average molecular weight (Mn) in the present invention are, unless otherwise specified, molecular weights obtained by detection with a solvent THF (tetrahydrofuran), a differential refractometer and conversion using polystyrene as a standard substance by a Gel Permeation Chromatography (GPC) analyzer using a column of TSKgel GMHxL, TSKgel G4000HxL, TSKgel G2000HxL (both of product names manufactured by TOSOH CORPORATION).
In the present invention, the term "lithographic printing plate precursor" includes not only lithographic printing plate precursors but also waste plate precursors. The term "lithographic printing plate" includes not only a lithographic printing plate produced by exposing and developing a lithographic printing plate precursor as necessary, but also a waste plate. In the case of a waste plate precursor, the operations of exposure and development are not necessarily required. The waste plate is, for example, a lithographic printing plate precursor to be mounted on an unused plate cylinder when printing is performed on a part of a paper surface in a single color or two colors in a color newspaper printing.
In the present invention, an "" in the chemical structural formula represents a bonding position with another structure.
The present invention will be described in detail below.
(lithographic printing original plate of on-press development type)
The on-press developable lithographic printing plate precursor of the present invention comprises a support, an image recording layer and an overcoat layer in this order, the image recording layer contains a binder polymer and an electron donating polymerization initiator, the binder polymer has a structural unit comprising an aromatic vinyl compound and a structural unit comprising an acrylonitrile compound, and the film thickness of the overcoat layer is thicker than the film thickness of the image recording layer.
As a result of intensive studies, the present inventors have found that a lithographic printing plate precursor capable of obtaining a lithographic printing plate excellent in chemical resistance can be provided by adopting the above-described structure.
The detailed mechanism by which the above-described effects can be obtained is not clear, but is presumed as follows.
The lithographic printing plate precursor of the present invention has an overcoat layer containing an electron donating polymerization initiator and having a film thickness thicker than that of the image recording layer. Thus, it is considered that the polymerization efficiency of the radical polymerizable compound in the exposed portion is improved, and the strength of the film of the image portion obtained after development is improved, so that the chemical resistance is improved.
The lithographic printing plate precursor according to the present invention contains a binder polymer (hereinafter, also referred to as "specific binder polymer") having a structural unit composed of an aromatic vinyl compound and a structural unit composed of an acrylonitrile compound. The chemical resistance is further improved by the synergistic effect based on the inclusion of all of the specific binder polymer, the overcoat layer and the electron-donating polymerization initiator, but the mechanism thereof is not clear.
The lithographic printing plate precursor described in patent document 1 or patent document 2 does not contain a specific binder polymer, and there is room for further improvement in terms of improvement in chemical resistance.
In the lithographic printing plate precursor described in patent document 3, there is no description nor suggestion about an overcoat layer having a film thickness thicker than that of an image recording layer, and chemical resistance is poor.
Further, it is considered that a lithographic printing plate excellent in printing durability can be easily obtained from the lithographic printing plate precursor according to the present invention. This is presumed to be a result of the improvement of the polymerization efficiency, the synergistic effect, and the like.
In a lithographic printing plate, the number of plates that can be printed is often referred to as "excellent resistance to brushing". Further, it is considered that a lithographic printing plate having excellent ink-fixing properties (hereinafter, also simply referred to as "ink-fixing properties") can be easily obtained from the lithographic printing plate precursor according to the present invention. This is presumed to be based on the result of the inclusion of the specific binder polymer, the synergistic effect, and the like.
Further, it is considered that a lithographic printing plate precursor excellent in on-press developability can be easily obtained from the lithographic printing plate precursor according to the present invention. This is presumed to be based on the result that, by containing a specific binder polymer, the non-image portion is easily removed by adhering to the ink roller at the time of on-press development (ink tack development), the above-described synergistic effect, and the like.
The lithographic printing plate precursor according to the present invention is considered to be excellent in the effects of being easily excellent in all of the brushing resistance, chemical resistance, inking property, and on-press developability, by including all of the specific binder polymers, the overcoat layer, and the electron-donating polymerization initiator. It is considered that, if any of the above requirements is absent, at least one of these effects is reduced.
In general, in the on-press development type lithographic printing plate, it is considered difficult to achieve a balance between chemical resistance obtained by reducing the solubility of an image portion with a chemical such as the above-mentioned plate cleaning solution, brushing resistance obtained by improving the resistance to an ink as a chemical, ink-staining property obtained by improving the affinity to an ink, or on-press development property obtained by excellent affinity of an unexposed portion with an ink.
Hereinafter, the details of each constituent element of the lithographic printing plate precursor according to the present invention will be described.
< support >
The lithographic printing plate precursor of the present invention has a support.
As the support, a support having a hydrophilic surface (also referred to as "hydrophilic support") is preferable. As the hydrophilic surface, a surface having a contact angle with water of less than 10 ° is preferable, and a surface having a contact angle with water of less than 5 ° is more preferable.
The water contact angle in the present invention was measured as a contact angle of a water droplet on a surface at 25 ℃ (after 0.2 sec) by DM-501 manufactured by Kyowa Interface Science co.
The support for the lithographic printing plate precursor according to the present invention can be appropriately selected from known supports for lithographic printing plate precursors and used. The support is preferably an aluminum plate which has been subjected to roughening treatment by a known method and to anodic oxidation treatment.
The aluminum plate may be further subjected to a surface hydrophilization treatment by alkali metal silicate as described in each specification of U.S. Pat. nos. 2,714,066, 3,181,461, 3,280,734 and 3,902,734, or a surface hydrophilization treatment by polyvinylphosphonic acid or the like as described in each specification of U.S. Pat. nos. 3,276,868, 4,153,461 and 4,689,272, and the pore enlargement treatment and pore sealing treatment of the anodic oxide film as described in japanese patent application laid-open nos. 2001-253181 and 2001-322365 can be appropriately selected and carried out as needed.
The center line average roughness of the support is preferably 0.10 to 1.2 μm.
The support may have a back coat layer containing an organic polymer compound described in Japanese patent application laid-open No. 5-045885 or a silicon alkoxide compound described in Japanese patent application laid-open No. 6-035174 on the surface opposite to the image recording layer, if necessary.
< image recording layer >
The lithographic printing plate precursor according to the present invention has an image recording layer formed on a support.
The image recording layer used in the present invention preferably further contains a polymerizable compound from the viewpoint of brush resistance and photosensitivity.
From the viewpoint of brush resistance and photosensitivity, the image recording layer used in the present invention preferably further contains an electron-accepting polymerization initiator.
The image recording layer used in the present invention preferably further contains an infrared absorber from the viewpoint of exposure sensitivity.
The image recording layer used in the present invention may further contain an acid developer in order to confirm exposed portions before development.
From the viewpoint of on-press developability, the lithographic printing plate precursor according to the present invention is preferably capable of removing unexposed portions of the image recording layer by at least one selected from the group consisting of a fountain solution and a printing ink.
The details of each component contained in the image recording layer will be described below.
[ specific Binder Polymer ]
The image recording layer used in the present invention contains a specific binder polymer.
In the present invention, the specific binder polymer is a binder resin that is not in the form of particles, and the polymer particles described later are not included in the specific binder polymer in the present invention.
The specific binder polymer has a structural unit formed from an aromatic vinyl compound and a structural unit formed from an acrylonitrile compound.
Structural units formed from aromatic vinyl compounds
The specific binder polymer has a structural unit formed of an aromatic vinyl compound.
The aromatic vinyl compound may be a compound having a structure in which an aromatic ring is bonded to a vinyl group, and examples thereof include a styrene compound and a vinylnaphthalene compound, and a styrene compound is preferable, and styrene is more preferable.
The styrene compound includes styrene, p-methylstyrene, p-methoxystyrene, β -methylstyrene, p-methyl- β -methylstyrene, α -methylstyrene and p-methoxy- β -methylstyrene, and styrene is preferably used.
Examples of the vinylnaphthalene compound include 1-vinylnaphthalene, methyl-1-vinylnaphthalene,. Beta. -methyl-1-vinylnaphthalene, 4-methyl-1-vinylnaphthalene, and 4-methoxy-1-vinylnaphthalene, and 1-vinylnaphthalene is preferably used.
Further, as the structural unit formed of an aromatic vinyl compound, a structural unit represented by the following formula A1 can be preferably mentioned.
[ chemical formula 4]
Figure GDA0002921369300000111
In the formula A1, R A1 And R A2 Each independently represents a hydrogen atom or an alkyl group, ar represents an aromatic ring group, R A3 Represents a substituent, and n represents an integer not more than the maximum number of substituents of Ar.
In the formula A1, R A1 And R A2 Each independently is preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, more preferably a hydrogen atom or a methyl group, and still more preferably a hydrogen atom.
In formula A1, ar is preferably a benzene ring or a naphthalene ring, and more preferably a benzene ring.
In the formula A1, R A3 Preferably an alkyl group or an alkoxy group, more preferably an alkyl group having 1 to 4 carbon atoms or an alkoxy group having 1 to 4 carbon atoms, and still more preferably a methyl group or a methoxy group.
In the formula A1, in the presence of a plurality of R A3 In the case of (2), a plurality of R A3 May be the same or different.
In formula A1, n is preferably an integer of 0 to 2, more preferably 0 or 1, and even more preferably 0.
The content of the structural unit formed from an aromatic vinyl compound in the specific binder polymer is preferably 15 to 85 mass%, more preferably 30 to 70 mass%, with respect to the total mass of the specific binder polymer.
Structural units formed from acrylonitrile compounds
The specific binder polymer has a structural unit formed of an acrylonitrile compound.
The acrylonitrile compound includes (meth) acrylonitrile and the like, and acrylonitrile is preferably used.
Further, as the structural unit formed of an acrylonitrile compound, a structural unit represented by the following formula B1 can be preferably mentioned.
[ chemical formula 5]
Figure GDA0002921369300000112
In the formula B1, R B1 Represents a hydrogen atom or an alkyl group.
In the formula B1, R B1 A hydrogen atom or an alkyl group having 1 to 4 carbon atoms is preferable, a hydrogen atom or a methyl group is more preferable, and a hydrogen atom is even more preferable.
The content of the structural unit composed of an acrylonitrile compound in the specific binder polymer is preferably 15 to 85 mass%, more preferably 30 to 70 mass%, with respect to the total mass of the specific binder polymer.
Structural units formed from N-vinyl heterocyclic compounds
From the viewpoint of brush resistance and chemical resistance, the specific binder polymer preferably further has a structural unit formed of an N-vinyl heterocyclic compound.
Examples of N-vinyl heterocyclic compounds include N-vinylpyrrolidone, N-vinylcarbazole, N-vinylpyrrole, N-vinylphenothiazine, N-vinylsuccinimide, N-vinylphthalimide, N-vinylcaprolactam and N-vinylimidazole, with N-vinylpyrrolidone being preferred.
Further, as the structural unit formed of the N-vinyl heterocyclic compound, a structural unit represented by the following formula C1 can be preferably mentioned.
[ chemical formula 6]
Figure GDA0002921369300000121
In the formula C1, ar N Represents a heterocyclic structure containing a nitrogen atom, ar N The nitrogen atom in (b) is bonded to the carbon atom represented by.
In the formula C1, from Ar N The heterocyclic structure represented by (a) is preferably a pyrrolidone ring, a carbazole ring, a pyrrole ring, a phenothiazine ring, a succinimide ring, a phthalimide ring, a caprolactam ring, or an imidazole ring, and more preferably a pyrrolidone ring.
And, from Ar N The heterocyclic structure represented may have a known substituent.
The content of the structural unit formed of the N-vinyl heterocyclic compound in the specific binder polymer is preferably 5 to 50% by mass, and more preferably 10 to 40% by mass, with respect to the total mass of the specific binder polymer.
Structural units having ethylenically unsaturated groups
The specific binder polymer may also have a structural unit having an ethylenically unsaturated group.
The ethylenically unsaturated group is not particularly limited, and examples thereof include a vinyl group, an allyl group, a vinylphenyl group, a (meth) acrylamide group, and a (meth) acryloyloxy group, and from the viewpoint of reactivity, a (meth) acryloyloxy group is preferable.
The structural unit having an ethylenically unsaturated group can be introduced into a specific binder polymer by a high molecular reaction or copolymerization. Specifically, the introduction can be carried out, for example, by a method in which a compound having an epoxy group and an ethylenically unsaturated group (for example, glycidyl methacrylate or the like) is reacted with a polymer into which a structural unit having a carboxyl group such as methacrylic acid or the like is introduced, a method in which a compound having an isocyanate group and an ethylenically unsaturated group (2-isocyanatoethyl methacrylate or the like) is reacted with a polymer into which a structural unit having a group having an active hydrogen such as a hydroxyl group is introduced, or the like.
The structural unit having an ethylenically unsaturated group can be introduced into the specific binder polymer by a method such as reacting a compound having a carboxyl group and an ethylenically unsaturated group with a polymer into which a structural unit having an epoxy group such as glycidyl (meth) acrylate is introduced.
Further, the structural unit having an ethylenically unsaturated group can be introduced into a specific binder polymer by using a monomer containing a partial structure represented by the following formula d1 or the following formula d2, for example. Specifically, for example, after polymerization is performed using at least the above-mentioned monomer, a partial structure represented by the following formula d1 or the following formula d2 is subjected to a release reaction using a basic compound to form an ethylenically unsaturated group, whereby a structural unit having an ethylenically unsaturated group is introduced into a specific binder polymer.
Figure GDA0002921369300000131
In the formulae d1 and d2, R d Represents a hydrogen atom or an alkyl group, A d Represents a halogen atom, X d represents-O-or-NR N -，R N Represents a hydrogen atom or an alkyl group, and represents a bonding site with another structure.
In the formulae d1 and d2, R d Preferably a hydrogen atom or a methyl group.
In the formulae d1 and d2, A d Preferably a chlorine atom, a bromine atom or an iodine atom.
In the formulae d1 and d2, X d preferably-O-. At X d represents-NR N In the case of-R N Preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and more preferably a hydrogen atom.
Examples of the structural unit having an ethylenically unsaturated group include structural units represented by the following formula D1.
[ chemical formula 7]
Figure GDA0002921369300000141
In the formula D1, L D1 Represents a single bond or a divalent linking group, L D2 Represents a m +1 valent linking group, X D1 And X D2 Each independently represents-O-or-NR N -，R N Represents a hydrogen atom or an alkyl group, R D1 And R D2 Each independently represents a hydrogen atom or a methyl group, and m represents an integer of 1 or more.
In the formula D1, L D1 Preferably a single bond. At L D1 When a divalent linking group is represented, it is preferably an alkylene group, an arylene group, or a divalent group in which 2 or more of these groups are bonded, and more preferably an alkylene group or a phenylene group having 2 to 10 carbon atoms.
In the formula D1, L D2 A group represented by any one of the following formulae D2 to D6 is preferable.
In the formula D1, X D1 And X D2 Are preferably-O-. And, in X D1 And X D2 At least one of (A) represents-NR N In the case of-R N Preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and more preferably a hydrogen atom.
In the formula D1, R D1 Preferably methyl.
In the formula D1, m are R D2 At least one of them is preferably methyl.
In the formula D1, m is preferably an integer of 1 to 4, more preferably 1 or 2, and further preferably 1.
[ chemical formula 8]
Figure GDA0002921369300000151
In the formulae D2 to D6, L D3 ～L D7 Represents a divalent linking group, L D5 And L D6 May be different from X in formula D1 D1 The wavy line portion represents a bond site with X in the formula D1 D2 The bonding site of (3).
In the formula D3, L D3 Preferably an alkylene group, an arylene group or a group in which 2 or more of these are bonded, and more preferably an alkylene group or a phenylene group having 1 to 10 carbon atoms or a group in which 2 or more of these are bonded.
In the formula D4, L D4 Preferably an alkylene group, an arylene group, or a group in which 2 or more of these are bonded, and more preferably an alkylene group having 1 to 10 carbon atoms, a phenylene group, or a group in which 2 or more of these are bonded.
In the formula D5, L D5 Preferably an alkylene group, an arylene group, or a group in which 2 or more of these are bonded, and more preferably an alkylene group having 1 to 10 carbon atoms, a phenylene group, or a group in which 2 or more of these are bonded.
In the formula D6, L D6 Preferably an alkylene group, an arylene group, or a group in which 2 or more of these are bonded, and more preferably an alkylene group having 1 to 10 carbon atoms, a phenylene group, or a group in which 2 or more of these are bonded.
In the formula D7, L D7 Preferably an alkylene group, an arylene group, or a group in which 2 or more of these are bonded, and more preferably an alkylene group having 1 to 10 carbon atoms, a phenylene group, or a group in which 2 or more of these are bonded.
Specific examples of the structural unit having an ethylenically unsaturated group are shown below, but the structural unit having an ethylenically unsaturated group contained in the binder polymer according to the present invention is not limited thereto. In the following specific examples, R represents a hydrogen atom or a methyl group, respectively.
[ chemical formula 9]
Figure GDA0002921369300000161
The content of the structural unit having an ethylenically unsaturated group in the specific binder polymer is preferably 5 to 60% by mass, and more preferably 10 to 30% by mass, with respect to the total mass of the specific binder polymer.
Structural units having acidic groups-
The specific binder polymer may contain a structural unit having an acidic group, and preferably does not contain a structural unit having an acidic group from the viewpoint of on-press developability and ink-receptivity.
Specifically, the content of the structural unit having an acidic group in the specific binder polymer is preferably 20% by mass or less, more preferably 10% by mass or less, and still more preferably 5% by mass or less. The lower limit of the content is not particularly limited, and may be 0 mass%.
The acid value of the specific binder polymer is preferably 160mgKOH/g or less, more preferably 80mgKOH/g or less, and still more preferably 40mgKOH/g or less. The lower limit of the acid value is not particularly limited, and may be 0mgKOH/g.
In the present invention, the acid value can be determined by a method based on JIS K0070:1992, etc.
Structural units having hydrophobic groups
The specific binder polymer may contain a structural unit containing a hydrophobic group from the viewpoint of ink receptivity.
Examples of the hydrophobic group include an alkyl group, an aryl group, and an aralkyl group.
The structural unit containing a hydrophobic group is preferably a structural unit formed from an alkyl (meth) acrylate compound, an aryl (meth) acrylate compound, or an arylalkyl (meth) acrylate compound, and more preferably a structural unit formed from an alkyl (meth) acrylate compound.
The alkyl group in the alkyl (meth) acrylate compound preferably has 1 to 10 carbon atoms. The alkyl group may be linear or branched, and may have a cyclic structure. Examples of the alkyl (meth) acrylate compound include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and dicyclopentyl (meth) acrylate.
The aryl group in the aryl (meth) acrylate compound preferably has 6 to 20 carbon atoms, and more preferably a phenyl group. The aryl group may have a known substituent. The aryl (meth) acrylate compound is preferably phenyl (meth) acrylate.
The alkyl group in the arylalkyl (meth) acrylate compound preferably has 1 to 10 carbon atoms. The alkyl group may be linear or branched, and may have a cyclic structure. The aryl group in the arylalkyl (meth) acrylate compound preferably has 6 to 20 carbon atoms, and more preferably a phenyl group. The arylalkyl (meth) acrylate compound is preferably benzyl (meth) acrylate.
The content of the structural unit having a hydrophobic group in the specific binder polymer is preferably 5 to 50% by mass, and more preferably 10 to 30% by mass, with respect to the total mass of the specific binder polymer.
Structural units having hydrophilic groups
From the viewpoint of improving the brush resistance, chemical resistance, and on-press developability, the specific binder polymer may contain a structural unit having a hydrophilic group.
Examples of the hydrophilic group include-OH, -CN and-CONR 1 R 2 、-NR 2 COR 1 (R 1 、R 2 Each independently represents a hydrogen atom, an alkyl group, an alkenyl group or an aryl group. R is 1 And R 2 May be bonded to form a ring. ) -NR 3 R 4 、-N + R 3 R 4 R 5 X - (R 3 ～R 5 Each independently represents an alkyl group having 1 to 8 carbon atoms, X - Representing a counter anion), a group represented by the following formula PO, and the like.
Among these hydrophilic groups, the group represented by-CONR is preferable 1 R 2 Or a group represented by the formula PO, more preferably a group represented by the formula PO.
[ chemical formula 10]
Figure GDA0002921369300000171
In the formula PO, L P Each independently represents an alkylene group, R P Represents a hydrogen atom or an alkyl group, and n represents an integer of 1 to 100.
In the formula PO, L P Each independently is preferably vinyl, 1-methylvinyl or 2-methylvinyl, more preferably vinyl.
In the formula PO, R P The alkyl group is preferably a hydrogen atom or an alkyl group having 1 to 18 carbon atoms, more preferably a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, still more preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and particularly preferably a hydrogen atom or a methyl group.
In the formula PO, n is preferably an integer of 1 to 10, more preferably an integer of 1 to 4.
The content of the structural unit having a hydrophilic group in the specific binder polymer is preferably 5 to 60% by mass, and more preferably 10 to 30% by mass, with respect to the total mass of the specific binder polymer.
Other structural units-
Certain binder polymers may also contain other structural units. The other constituent unit may include, but is not particularly limited to, a constituent unit other than the above-described constituent units, and examples thereof include a constituent unit formed from an acrylamide compound, a vinyl ether compound, and the like.
Examples of the acrylamide compound include (meth) acrylamide, N-methyl (meth) acrylamide, N-ethyl (meth) acrylamide, N-propyl (meth) acrylamide, N-butyl (meth) acrylamide, N '-dimethyl (meth) acrylamide, N' -diethyl (meth) acrylamide, N-hydroxyethyl (meth) acrylamide, N-hydroxypropyl (meth) acrylamide, and N-hydroxybutyl (meth) acrylamide.
Examples of the vinyl ether compound include methyl vinyl ether, ethyl vinyl ether, propyl vinyl ether, n-butyl vinyl ether, tert-butyl vinyl ether, 2-ethylhexyl vinyl ether, n-nonyl vinyl ether, lauryl vinyl ether, cyclohexyl methyl vinyl ether, 4-methylcyclohexyl methyl vinyl ether, benzyl vinyl ether, dicyclopentenyl vinyl ether, 2-dicyclopentenyloxyethyl vinyl ether, methoxyethyl vinyl ether, ethoxyethyl vinyl ether, butoxyethyl vinyl ether, methoxyethoxyethyl vinyl ether, ethoxyethoxyethoxyethyl vinyl ether, methoxypolyethylene glycol vinyl ether, tetrahydrofurfuryl vinyl ether, 2-hydroxyethyl vinyl ether, 2-hydroxypropyl vinyl ether, 4-hydroxybutyl vinyl ether, 4-hydroxymethylcyclohexyl methyl vinyl ether, diethylene glycol monovinyl ether, polyethylene glycol vinyl ether, chloroethyl vinyl ether, chlorobutyl vinyl ether, chloroethoxyethyl vinyl ether, phenethyl vinyl ether, and phenoxypolyethylene glycol vinyl ether.
The content of the other structural unit in the specific binder polymer is preferably 5 to 50% by mass, and more preferably 10 to 30% by mass, based on the total mass of the specific binder polymer.
Method for producing specific binder polymers
The method for producing the specific binder polymer is not particularly limited, and can be produced by a known method.
For example, the polymerizable compound is obtained by polymerizing a styrene compound, an acrylonitrile compound, and, if necessary, at least one compound selected from the group consisting of the above-mentioned N-vinyl heterocyclic compound, the compound used for forming the structural unit having an ethylenically unsaturated group, the compound used for forming the structural unit having an acidic group, the compound used for forming the structural unit having a hydrophobic group, and the compound used for forming the other structural unit by a known method.
Molecular weight-
The weight average molecular weight of the specific binder polymer is preferably 3,000 to 300,000, more preferably 5,000 to 100,000.
Specific examples
Specific examples of the specific binder polymer are shown in the following table, but the specific binder polymer used in the present invention is not limited thereto.
[ chemical formula 11]
Figure GDA0002921369300000201
In the specific examples, the content ratio of each constituent unit can be appropriately changed according to the preferable range of the content of each constituent unit.
The weight average molecular weight of each compound shown in the specific examples can be appropriately changed depending on the preferable range of the weight average molecular weight of the specific binder polymer.
Content-
The image recording layer may contain one specific binder polymer alone or two or more types may be used simultaneously.
The content of the specific binder polymer is preferably 5% by mass or more and 95% by mass or less, more preferably 7% by mass or more and 80% by mass or less, and still more preferably 10% by mass or more and 60% by mass or less, with respect to the total mass of the image recording layer.
[ Electron donating type polymerization initiator ]
The image recording layer used in the present invention preferably contains an electron donating polymerization initiator. It is considered that the electron donating type polymerization initiator contributes to the improvement of chemical resistance and brush resistance in the lithographic printing plate. Examples of the electron donating polymerization initiator include the following 5 types.
(i) Alkyl or arylate type complexes: it is believed that the carbon-heterobonds are oxidatively cleaved and active radicals are generated. Specifically, a borate compound and the like can be given.
(ii) Aminoacetic acid compound: it is believed that the C — X bond on the carbon adjacent to the nitrogen is cleaved by oxidation to generate an active radical. X is preferably a hydrogen atom, a carboxyl group, a trimethylsilyl group or a benzyl group. Specific examples thereof include N-phenylglycine (which may have a substituent on the phenyl group), N-phenyliminodiacetic acid (which may have a substituent on the phenyl group), and the like.
(iii) A sulfur-containing compound: the compound obtained by substituting the nitrogen atom of the glycine compound with a sulfur atom can generate an active radical by the same action. Specifically, phenylthioacetic acid (which may have a substituent in the phenyl group) and the like are exemplified.
(iv) A tin-containing compound: the compound obtained by substituting the nitrogen atom of the glycine compound with a tin atom can generate an active radical by the same action.
(v) Sulfinates: can generate active free radicals by oxidation. Specifically, sodium arylsulfinate and the like can be given.
Of these electron-donating polymerization initiators, the image-recording layer preferably contains a borate compound. The borate compound is preferably a tetraarylborate compound or a monoalkyltriarylborate compound, and from the viewpoint of stability of the compound, a tetraarylborate compound is more preferably used, and a tetraphenylborate compound is particularly preferably used.
The counter cation of the borate compound is not particularly limited, but is preferably an alkali metal ion or a tetraalkylammonium ion, and more preferably a sodium ion, a potassium ion or a tetrabutylammonium ion.
Specific examples of the borate compound include sodium tetraphenylborate.
From the viewpoint of chemical resistance and brush resistance, the Highest Occupied Molecular Orbital (HOMO) of the electron donating polymerization initiator used in the present invention is preferably-6.00 eV or more, more preferably-5.95 eV or more, and still more preferably-5.93 eV or more.
The upper limit is preferably-5.00 eV or less, and more preferably-5.40 eV or less.
In the present invention, the calculation of the Highest Occupied Molecular Orbital (HOMO) and the Lowest Unoccupied Molecular Orbital (LUMO) is performed by the following method.
First, the counter anion in the compound to be calculated is ignored.
Quantum chemistry computing software Gaussian09 was used and structure optimization was performed by DFT (B3 LYP/6-31G (d)).
For MO (molecular orbital) energy calculation, the structure obtained by the above structure optimization was used and performed as DFT (B3 LYP/6-31+ G (d, p)/CPCM (solvent) = methanol)).
The MO energy Ebare (unit: hartree) obtained by the above MO energy calculation is converted into Escaped (unit: eV) which is used as the value of HOMO and LUMO in the present invention by the following formula.
Escaled＝0.823168×27.2114×Ebare-1.07634
27.2114 is a coefficient for converting hartree to eV only, 0.823168 and-1.07634 are adjustment coefficients, and HOMO and LUMO of a compound to be calculated are defined so that the calculation matches the actual measurement value.
Hereinafter, B-1 to B-8 and other compounds are shown as preferable specific examples of the electron donating type polymerization initiator, but it goes without saying that these are not limitative. In the following chemical formula, bu represents an n-butyl group, and Z represents a counter cation.
As the counter cation represented by Z, na may be mentioned + 、K + And N + (Bu) 4 And the like. Bu mentioned above represents an n-butyl group.
Further, as the counter cation represented by Z, an onium ion in an electron accepting type polymerization initiator described later can be preferably used.
[ chemical formula 12]
Figure GDA0002921369300000231
[ chemical formula 13]
Figure GDA0002921369300000241
The electron-donating polymerization initiator may be added alone or in combination of two or more.
The content of the electron-donating polymerization initiator is preferably 0.01 to 30% by mass, more preferably 0.05 to 25% by mass, and still more preferably 0.1 to 20% by mass, based on the total mass of the image recording layer.
[ polymerizable Compound ]
The image recording layer in the present invention preferably contains a polymerizable compound.
In the present invention, even if the compound is a polymerizable compound, the compound corresponding to the specific binder polymer, the polymer particles described later, and the binder polymer other than the specific binder described later does not correspond to the polymerizable compound.
The molecular weight (weight average molecular weight in the case of having a molecular weight distribution) of the polymerizable compound is preferably 50 or more and less than 2,500, and more preferably 50 or more and 2,000 or less.
The polymerizable compound used in the present invention may be, for example, a radical polymerizable compound or a cationic polymerizable compound, but is preferably an addition polymerizable compound (ethylenically unsaturated compound) having at least one ethylenically unsaturated bond. The ethylenically unsaturated compound is preferably a compound having at least one terminal ethylenically unsaturated bond, and more preferably a compound having 2 or more terminal ethylenically unsaturated bonds. The polymerizable compound has a chemical form such as a monomer, a prepolymer, that is, a dimer, a trimer, or an oligomer, or a mixture thereof.
Examples of the monomer include unsaturated carboxylic acids (e.g., acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, and maleic acid), esters thereof, and amides thereof, and esters of unsaturated carboxylic acids and polyhydric alcohol compounds, and amides of unsaturated carboxylic acids and polyhydric amine compounds are preferably used. Further, addition reaction products of unsaturated carboxylic acid esters or amides having a nucleophilic substituent such as a hydroxyl group, an amino group, or a mercapto group with monofunctional or polyfunctional isocyanates or epoxies, dehydration condensation reaction products with monofunctional or polyfunctional carboxylic acids, and the like are also preferably used. Also, addition reaction products of unsaturated carboxylic acid esters or amides having electrophilic substituent groups such as isocyanate group and epoxy group with monofunctional or polyfunctional alcohols, amines and thiols are preferable, and substitution reaction products of unsaturated carboxylic acid esters or amides having leaving substituent groups such as halogen atom and tosyloxy group with monofunctional or polyfunctional alcohols, amines and thiols are more preferable. As another example, a compound group in which the unsaturated carboxylic acid is substituted with an unsaturated phosphonic acid, styrene, vinyl ether, or the like can also be used. These are described in Japanese patent application laid-open No. 2006-508380, japanese patent application laid-open No. 2002-287344, japanese patent application laid-open No. 2008-256850, japanese patent application laid-open No. 2001-342222, japanese patent application laid-open No. 9-179296, japanese patent application laid-open No. 9-179297, japanese patent application laid-open No. 9-179298, japanese patent application laid-open No. 2004-294935, japanese patent application laid-open No. 2006-243493, japanese patent application laid-open No. 2002-275129, japanese patent application laid-open No. 2003-064130, japanese patent application laid-open No. 2003-280187, japanese patent application laid-open No. 10-333321, and the like.
Specific examples of the ester monomer of the polyol compound and the unsaturated carboxylic acid include ethylene glycol diacrylate, 1,3-butanediol diacrylate, tetramethylene glycol diacrylate, propylene glycol diacrylate, trimethylolpropane triacrylate, hexanediol diacrylate, tetraethylene glycol diacrylate, pentaerythritol tetraacrylate, sorbitol triacrylate, ethylene oxide isocyanurate (EO) -modified triacrylate, and polyester acrylate oligomer. Examples of the methacrylate include tetramethylene glycol dimethacrylate, neopentyl glycol dimethacrylate, trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, pentaerythritol trimethacrylate, bis [ p- (3-methacryloyloxy-2-hydroxypropoxy) phenyl ] dimethyl methane, bis [ p- (methacryloyloxy-ethoxy) phenyl ] dimethyl methane and the like. Specific examples of the amide monomer of the polyamine compound and the unsaturated carboxylic acid include methylenebisacrylamide, methylenebismethacrylamide, 1,6-hexamethylenebisacrylamide, 1,6-hexamethylenebismethacrylamide, diethylenetriaminetriacrylate, xylylenebisacrylamide, diphenylenedimethacrylamide, and the like.
Further, urethane addition polymerizable compounds produced by an addition reaction of isocyanate and hydroxyl group are also preferable, and specific examples thereof include vinyl urethane compounds containing 2 or more polymerizable vinyl groups in 1 molecule, which are obtained by adding a polyisocyanate compound having 2 or more isocyanate groups in 1 molecule and a hydroxyl group-containing vinyl monomer represented by the following formula (M) as described in japanese patent publication No. 48-041708.
CH 2 ＝C(R M4 )COOCH 2 CH(R M5 )OH (M)
In the formula (M), R M4 And R M5 Each independently represents a hydrogen atom or a methyl group.
Also, preferred are urethane acrylates described in Japanese patent laid-open Nos. Sho 51-037193, japanese patent publication No. Hei 2-032293, japanese patent publication No. Hei 2-016765, japanese patent laid-open No. 2003-344997, japanese patent laid-open No. 2006-065210, japanese patent publication No. Sho 58-049860, japanese patent publication No. Sho 56-017654, japanese patent publication No. Sho 62-039417, japanese patent publication No. Hei 62-039418, japanese patent laid-open Nos. 2000-250211 and 2007-094138, urethane compounds having an ethylene oxide skeleton described therein, japanese patent publication No. 7153632, japanese patent laid-open No. Hei 8-505958, japanese patent publication No. Sho 3221 and Japanese patent laid-open No. 2007-293, and hydrophilic urethane compounds described therein.
The structure of the polymerizable compound can be arbitrarily set to the details of the method of use such as single use or simultaneous use, and the amount of addition.
The content of the polymerizable compound is preferably 5 to 75% by mass, more preferably 10 to 70% by mass, and still more preferably 15 to 60% by mass, based on the total mass of the image recording layer.
The content of the specific binder polymer in the image recording layer is preferably more than 0% by mass and 400% by mass or less, more preferably 25% by mass to 300% by mass, and still more preferably 50% by mass to 200% by mass, based on the total mass of the polymerizable compound.
In the image recording layer, the specific binder polymer and the polymerizable compound preferably have a sea-island structure. For example, a structure in which the above-mentioned polymerizable compound is dispersed in islands (discontinuous layer) in the sea (continuous phase) of a specific binder polymer can be employed. It is considered that the sea-island structure is easily formed by setting the content of the specific binder polymer to the value within the above range with respect to the total mass of the polymerizable compound.
[ Electron-accepting polymerization initiator ]
The image recording layer preferably contains an electron accepting type polymerization initiator.
The electron accepting type polymerization initiator used in the present invention is a compound which generates a polymerization initiating species such as a radical or a cation by light, heat or energy of both, and can be appropriately selected from known thermal polymerization initiators, compounds having a bond with a small bond dissociation energy, photopolymerization initiators and the like.
The electron acceptor type polymerization initiator is preferably a radical polymerization initiator, and more preferably an onium compound.
The electron-accepting type polymerization initiator is preferably an infrared photosensitive polymerization initiator.
The electron accepting type polymerization initiator may be used singly or in combination of two or more.
Examples of the radical polymerization initiator include (a) an organic halide, (b) a carbonyl compound, (c) an azo compound, (d) an organic peroxide, (e) a metallocene compound, (f) an azide compound, (g) a hexaarylbiimidazole compound, (i) a disulfone compound, (j) an oxime ester compound, and (k) an onium compound.
(a) As the organic halide, for example, compounds described in paragraphs 0022 to 0023 of jp 2008-195018 a are preferable.
(b) As the carbonyl compound, for example, a compound described in paragraph 0024 of jp 2008-195018 a is preferable.
(c) As the azo compound, for example, an azo compound described in Japanese patent application laid-open No. 8-108621 can be used.
(d) As the organic peroxide, for example, a compound described in paragraph 0025 of japanese unexamined patent application publication No. 2008-195018 is preferable.
(e) The metallocene compound is preferably a compound described in paragraph 0026 of Japanese patent laid-open No. 2008-195018, for example.
(f) Examples of the azide compound include 2,6-bis (4-azidobenzylidene) -4-methylcyclohexanone and the like.
(g) As the hexaarylbiimidazole compound, for example, a compound described in paragraph 0027 of japanese patent application laid-open No. 2008-195018 is preferable.
(i) Examples of the disulfone compound include those described in Japanese patent application laid-open Nos. 61-166544 and 2002-328465.
(j) The oxime ester compound is preferably a compound described in paragraphs 0028 to 0030 of jp 2008-195018 a, for example.
Among the above-mentioned electron-accepting polymerization initiators, preferred compounds include oxime ester compounds and onium compounds from the viewpoint of curability. Among them, from the viewpoint of brush resistance, an iodonium salt compound, a sulfonium salt compound, or an azinium salt compound is preferable, an iodonium salt compound or a sulfonium salt compound is more preferable, and an iodonium salt compound is even more preferable.
Specific examples of these compounds are shown below, but the present invention is not limited thereto.
As an example of the iodonium salt compound, a diaryliodonium salt compound is preferable, an electron donating group is particularly preferable, for example, a diphenyliodonium salt compound substituted with an alkyl group or an alkoxy group is more preferable, and an asymmetric diphenyliodonium salt compound is preferable. Specific examples include diphenyliodonium = hexafluorophosphate, 4-methoxyphenyl-4- (2-methylpropyl) phenyliodonium = hexafluorophosphate, 4- (2-methylpropyl) phenyl-p-tolyliodonium = hexafluorophosphate, 4-hexyloxyphenyl-2,4,6-trimethoxyphenyliodonium = hexafluorophosphate, 4-hexyloxyphenyl-2,4-diethoxyphenyliodonium = tetrafluoroborate, 4-octyloxyphenyl-2,4,6-trimethoxyphenyliodonium = 1-perfluorobutylsulfonate, 4-octyloxyphenyl-2,4,6-trimethoxyphenyliodonium = hexafluorophosphate, and bis (4-tert-butylphenyl) iodonium = tetraphenylborate.
As an example of the sulfonium salt compound, a triarylsulfonium salt compound is preferable, and particularly, an electron-withdrawing group is preferable, and for example, a triarylsulfonium salt compound in which at least a part of groups on an aromatic ring is substituted with a halogen atom is preferable, and a triarylsulfonium salt compound in which the total number of substitution of halogen atoms on an aromatic ring is 4 or more is more preferable. Specific examples thereof include triphenylsulfonium = hexafluorophosphate, triphenylsulfonium = benzoylformate, bis (4-chlorophenyl) phenylsulfonium = benzoylformate, bis (4-chlorophenyl) -4-tolylsulfonium = tetrafluoroborate, tris (4-chlorophenyl) sulfonium =3,5-bis (methoxycarbonyl) benzenesulfonate, tris (4-chlorophenyl) sulfonium = hexafluorophosphate, and tris (2,4-dichlorophenyl) sulfonium = hexafluorophosphate.
Further, as the counter anion of the iodonium salt compound and the sulfonium salt compound, a sulfonamide or sulfonimide is preferable, and sulfonimide is more preferable.
As the sulfonamide, aryl sulfonamide is preferable.
Also, as the sulfonimide, bis-aryl sulfonimide is preferable.
Specific examples of sulfonamides and sulfonimides are shown below, but the present invention is not limited to these. In the following specific examples, ph represents a phenyl group, me represents a methyl group, and Et represents an ethyl group.
[ chemical formula 14]
Figure GDA0002921369300000291
In a preferred embodiment of the present invention, a salt is formed from the electron accepting polymerization initiator and the electron donating polymerization initiator.
Specifically, for example, there is a mode in which the onium compound is a salt of an onium ion and an anion (for example, tetraphenylborate anion) in the electron donating polymerization initiator. Further, more preferably, an iodonium borate compound in which a salt is formed from an iodonium cation (for example, a di-to-tri iodonium cation) in the iodonium salt compound described later and a borate anion in the electron donating polymerization initiator is mentioned.
In the present invention, when the image recording layer contains an onium ion and an anion in the electron-donating polymerization initiator, the image recording layer contains an electron-accepting polymerization initiator and an electron-donating polymerization initiator.
From the viewpoint of chemical resistance and brush resistance, the Lowest Unoccupied Molecular Orbital (LUMO) of the electron-accepting polymerization initiator is preferably-3.00 eV or less, and more preferably-3.02 eV or less.
The lower limit is preferably-3.80 eV or more, and more preferably-3.60 eV or more.
The content of the electron accepting type polymerization initiator is preferably 0.1 to 50% by mass, more preferably 0.5 to 30% by mass, and particularly preferably 0.8 to 20% by mass, with respect to the total mass of the image recording layer.
[ Infrared absorber ]
The image recording layer preferably contains an infrared absorber.
Examples of the infrared absorber include pigments and dyes.
As The dye used as The infrared absorber, there can be used a commercially available dye and a known dye described in The literature such as "dye review" (The Society of Synthetic Organic Chemistry, japan. Ed., showa 45 (1970) "). Specific examples thereof include azo dyes, metal complex azo dyes, pyrazolone azo dyes, naphthoquinone dyes, anthraquinone dyes, phthalocyanine dyes, carbonium dyes, quinonimine dyes, methine dyes, cyanine dyes, arylcyanine dyes, pyrylium salts, metal thiolate complexes, and the like.
Among these dyes, particularly preferred dyes include cyanine dyes, squarylium dyes, pyrylium salts, nickel thiol complexes, and indocyanine dyes. Further, cyanine dyes and indocyanine dyes can be mentioned. Among them, cyanine is particularly preferable.
Specific examples of the cyanine dye include compounds described in paragraphs 0017 to 0019 of Japanese patent application laid-open No. 2001-133969, paragraphs 0016 to 0021 of Japanese patent application laid-open No. 2002-023360, and paragraphs 0012 to 0037 of Japanese patent application laid-open No. 2002-040638, preferably in paragraphs 0034 to 0041 of Japanese patent application laid-open No. 2002-278057, and paragraphs 0080 to 0086 of Japanese patent application laid-open No. 2008-195018, and particularly preferably in paragraphs 0035 to 0043 of Japanese patent application laid-open No. 2007-090850, and paragraphs 0105 to 0113 of Japanese patent application laid-open No. 2012-206495.
Further, it is also possible to preferably use compounds described in paragraphs 0008 to 0009 of Japanese patent application laid-open No. 5-005005 and paragraphs 0022 to 0025 of Japanese patent application laid-open No. 2001-222101.
The pigment is preferably a compound described in paragraphs 0072 to 0076 of jp 2008-195018 a.
The infrared absorber is preferably an infrared absorber that decomposes by exposure to infrared light (hereinafter, also referred to as a "decomposable infrared absorber").
It is estimated that a film having high polarity can be obtained by using an infrared absorber dye which is decomposed by infrared exposure as the infrared absorber to accelerate polymerization of the infrared absorber or its decomposition product and using a specific binder polymer, and that the brush resistance (UV brush resistance) is excellent even when UV ink is used by allowing the decomposition product of the infrared absorber to interact with the binder polymer.
The decomposable infrared absorber is preferably an infrared absorber having a function of developing a color by absorbing and decomposing infrared rays upon exposure to infrared rays. The term "color development" means that there is almost no absorption in the visible light region (wavelength region of 400nm or more and less than 750 nm) before infrared exposure, but absorption occurs in the visible light region by infrared exposure, and the absorption in the lower wavelength region than the visible light region is also a wavelength longer in the visible light region.
Hereinafter, a color-developing compound formed by the decomposable infrared absorber absorbing and decomposing infrared light by infrared light exposure is also referred to as a "color-developing body of the decomposable infrared absorber".
The decomposable infrared absorbing agent preferably has a function of absorbing infrared rays by infrared ray exposure and converting the absorbed infrared rays into heat.
The decomposable infrared ray absorber may be one which absorbs and decomposes at least a part of light in the infrared ray wavelength region (wavelength of 750nm to 1 mm), and is preferably one having a maximum absorption in the wavelength region of 750nm to 1,400nm.
The decomposable infrared absorbing agent is preferably an infrared absorbing agent decomposed by heat, electron transfer or both of them due to infrared exposure, and more preferably an infrared absorbing agent decomposed by electron transfer due to infrared exposure. Here, "decomposition by electron transfer" means that, by exposure to infrared light, electrons excited from the HOMO (highest occupied molecular orbital) to the LUMO (lowest unoccupied molecular orbital) of the decomposable infrared absorber undergo intramolecular electron transfer to an electron-accepting group (group close to the LUMO potential) in a molecule, thereby causing decomposition.
The above-mentioned decomposable infrared absorber is preferably a cyanine dye decomposed by infrared exposure from the viewpoints of color developability and UV resistance of the obtained lithographic printing plate.
The infrared absorber is more preferably a compound represented by the following formula 1 from the viewpoints of color developability and UV resistance of the obtained lithographic printing plate.
[ chemical formula 15]
Figure GDA0002921369300000321
In the formula 1, R 1 Represents R by infrared ray exposure 1 -L bond-breaking group, R 11 ～R 18 Independently represent a hydrogen atom, a halogen atom, -Ra, -ORb, -SRc or-NRdRe, ra to Re independently represent a hydrocarbon group, A 1 、A 2 And a plurality of R 11 ～R 18 May be linked to form a monocyclic or polycyclic ring, A 1 And A 2 Each independently represents an oxygen atom, a sulfur atom or a nitrogen atom, n 11 And n 12 Each independently represents an integer of 0 to 5, wherein n 11 And n 12 Is 2 or more, n 13 And n 14 Each independently represents 0 or 1,L represents an oxygen atom, a sulfur atom or-NR 10 -，R 10 Represents a hydrogen atom, an alkyl group or an aryl group, and Za represents a counter ion for neutralizing a charge.
The cyanine dye represented by formula 1, when exposed to infrared light, R represents 1 -L bond cleavage, L being = O, = S or = NR 10 Thereby forming a color developing body of the decomposable infrared ray absorbing agent. R is 1 Disassociate to form free radicals or ions. These contribute to polymerization of the compound having polymerizability contained in the image recording layer.
In formula 1, R 11 ～R 18 Each independently preferably a hydrogen atom, -Ra, -ORb, -SRc or-NRdRe.
The hydrocarbon group in Ra to Re is preferably a hydrocarbon group having 1 to 30 carbon atoms, more preferably a hydrocarbon group having 1 to 15 carbon atoms, and still more preferably a hydrocarbon group having 1 to 10 carbon atoms. The hydrocarbon group may be linear, branched, or cyclic.
R in formula 1 11 ～R 14 Each independently is preferably a hydrogen atom or a hydrocarbon group, more preferably a hydrogen atom or an alkyl group, and still more preferably a hydrogen atom.
And R bonded to the carbon atom bonded to L 11 And R 13 Preferably an alkyl group, more preferably the two are linked to form a ring. Formed as described aboveThe ring is preferably a 5-or 6-membered ring, more preferably a 5-membered ring.
And A 1 + R bound to the carbon atom to which it is bound 12 And A 2 R bound to the carbon atom to which it is bound 14 Preferably each of R 15 And R 17 Joined to form a ring.
R in formula 1 15 Preferably a hydrocarbon group. And, preferably R 15 And A 1 + R bound to the carbon atom to which it is bound 12 Joined to form a ring. The ring to be formed is preferably an indole ring, a pyrylium ring, a thiopyrylium (thiopyrylium) ring, a benzoxazoline ring or a benzimidazoline ring, and more preferably an indole ring from the viewpoint of color developability.
R in formula 1 17 Preferably a hydrocarbon group. And, preferably R 17 And A 2 R bound to the carbon atom to which it is bound 14 Joined to form a ring. The ring to be formed is preferably an indole ring, a pyran ring, a thiopyran ring, a benzoxazole ring or a benzimidazole ring, and more preferably an indole ring from the viewpoint of color developability.
R in formula 1 15 And R 17 The same groups are preferred, and in the case where the groups form respective rings, the same rings are preferably formed.
R in formula 1 16 And R 18 Preferably the same groups.
Furthermore, from the viewpoint of improving the water solubility of the compound represented by formula 1, R 16 And R 18 Each independently is preferably an alkyl group having a (poly) oxyalkylene group or an alkyl group having an anionic structure, more preferably an alkoxyalkyl group, an alkyl group having a carboxylate group or a sulfonate group, and still more preferably an alkyl group having a sulfonate group at a terminal. The alkyl group is preferably an alkyl group having 1 to 10 carbon atoms, and more preferably an alkyl group having 1 to 4 carbon atoms.
The counter cation of the above anionic structure may be R in the formula 1 1 A cation which can be contained in-L or A 1 + The cation may be an alkali metal cation or an alkaline earth metal cation.
Above sulfurThe counter cation of the ester group may be R in formula 1 1 A cation which can be contained in-L or A 1 + The cation may be an alkali metal cation or an alkaline earth metal cation.
Further, the maximum absorption wavelength of the compound represented by formula 1 is made longer, and R is from the viewpoint of color developability and brush resistance in a lithographic printing plate 16 And R 18 Each independently is preferably an alkyl group or an alkyl group having an aromatic ring. The alkyl group is preferably an alkyl group having 1 to 10 carbon atoms, more preferably an alkyl group having 1 to 4 carbon atoms, and still more preferably a methyl group or an ethyl group. The alkyl group having an aromatic ring is preferably an alkyl group having an aromatic ring at the end, and more preferably a 2-phenylethyl group, a 2-naphthylethyl group or a 2- (9-anthryl) ethyl group.
N in formula 1 11 And n 12 The same integer of 0 to 5 is preferable, an integer of 1 to 3 is more preferable, 1 or 2 is further preferable, and 2 is particularly preferable.
A in formula 1 1 And A 2 Each independently represents an oxygen atom, a sulfur atom or a nitrogen atom, preferably a nitrogen atom.
A in formula 1 1 And A 2 Preferably the same atom.
Za in formula 1 represents a counter ion for neutralizing charge. Examples of the anion species include a sulfonate ion, a carboxylate ion, a tetrafluoroborate ion, a hexafluorophosphate ion, a hexafluoroantimonate ion, a p-toluenesulfonate ion, and a perchlorate ion, and a hexafluorophosphate ion or a hexafluoroantimonate ion is preferable. When a cationic species is represented, examples thereof include alkali metal ions, alkaline earth metal ions, ammonium ions, pyridinium ions, sulfonium ions, and the like, and sodium ions, potassium ions, ammonium ions, pyridinium ions, or sulfonium ions are preferable, and sodium ions, potassium ions, or ammonium ions are more preferable.
R 11 ～R 18 And R 1 L may have an anionic structure and a cationic structure, if R 11 ～R 18 And R 1 L all being charge-neutral radicals, then Za is a monovalent counter anion, e.g. at R 11 ～R 18 And R 1 When L has an anionic structure of 2 or more, za can be a counter cation.
If the cyanine dye represented by formula 1 has a structure in which the charge is neutral in the entire compound, za does not exist.
By R in formula 1 1 R is an infrared ray exposure 1 The group in which the-L bond is broken will be described in detail later.
The above-mentioned decomposable infrared absorber is more preferably a cyanine dye represented by the following formula 1-a from the viewpoints of color developability and UV resistance of the obtained lithographic printing plate.
[ chemical formula 16]
Figure GDA0002921369300000341
In the formula 1-A, R 1 Represents R by infrared ray exposure 1 -L bond-breaking group, R 2 And R 3 Each independently represents a hydrogen atom or an alkyl group, R 2 And R 3 May be linked to each other to form a ring, ar 1 And Ar 2 Each independently represents a group forming a benzene ring or a naphthalene ring, Y 1 And Y 2 Each independently represents an oxygen atom, a sulfur atom, -NR 0 Or a dialkylmethylene group, R 0 Represents a hydrogen atom, an alkyl group or an aryl group, R 4 And R 5 Each independently represents an alkyl group, -CO 2 M radical or-PO 3 M 2 M represents a hydrogen atom, a Na atom, a K atom or an onium group, R 6 ～R 9 Each independently represents a hydrogen atom or an alkyl group, L represents an oxygen atom, a sulfur atom or-NR 10 -，R 10 Represents a hydrogen atom, an alkyl group or an aryl group, and Za represents a counter ion for neutralizing a charge.
In the formula 1-A, R 2 ～R 9 And R 0 The alkyl group in (1) is preferably an alkyl group having 1 to 30 carbon atoms, more preferably an alkyl group having 1 to 15 carbon atoms, and still more preferably an alkyl group having 1 to 10 carbon atoms. The alkyl group may be linear, branched, or the likeMay have a ring structure.
Specific examples thereof include methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, hexadecyl, octadecyl, eicosyl, isopropyl, isobutyl, sec-butyl, tert-butyl, isopentyl, neopentyl, 1-methylbutyl, isohexyl, 2-ethylhexyl, 2-methylhexyl, cyclohexyl, cyclopentyl and 2-norbornyl groups.
Among the alkyl groups, methyl, ethyl, propyl or butyl is preferred.
The above alkyl group may have a substituent. Examples of the substituent include an alkoxy group, an aryloxy group, an amino group, an alkylthio group, an arylthio group, a halogen atom, a carboxyl group, a carboxylate group, a sulfo group, a sulfonate group, an alkoxycarbonyl group, an aryloxycarbonyl group, and a group obtained by combining these groups.
R 0 The aryl group in (4) is preferably an aryl group having 6 to 30 carbon atoms, more preferably an aryl group having 6 to 20 carbon atoms, and still more preferably an aryl group having 6 to 12 carbon atoms.
The above aryl group may have a substituent. Examples of the substituent include an alkyl group, an alkoxy group, an aryloxy group, an amino group, an alkylthio group, an arylthio group, a halogen atom, a carboxyl group, a carboxylate group, a sulfo group, a sulfonate group, an alkoxycarbonyl group, an aryloxycarbonyl group, and a group obtained by combining these groups.
Specific examples thereof include phenyl, naphthyl, p-tolyl, p-chlorophenyl, p-fluorophenyl, p-methoxyphenyl, p-dimethylaminophenyl, p-methylthiophenyl and p-phenylthiophenyl.
Among aryl groups, preferred is a phenyl group, a p-methoxyphenyl group, a p-dimethylaminophenyl group, or a naphthyl group.
R 2 And R 3 Preferably joined to form a ring.
At R 2 And R 3 When they are linked to form a ring, they are preferably 5-or 6-membered rings, and particularly preferably 5-membered rings.
Y 1 And Y 2 Each independently represents an oxygen atom, a sulfur atom, -NR 0 -or dialkylmethylene, preferably-NR 0 -or a dialkylmethylene group, more preferably a dialkylmethylene group.
R 0 Represents a hydrogen atom, an alkyl group or an aryl group, preferably an alkyl group.
R 4 Or R 5 The alkyl groups represented may be substituted alkyl groups. As R 4 Or R 5 Examples of the substituted alkyl group include those represented by any of the following formulae (a 1) to (a 4).
[ chemical formula 17]
Figure GDA0002921369300000351
-R W2 -CO 2 M (a2)
-R W3 -PO 3 M 2 (a3)
-R W4 -SO 3 M (a4)
In the formulae (a 1) to (a 4), R W0 Represents an alkylene group having 2 to 6 carbon atoms, W represents a single bond or an oxygen atom, n W1 Represents an integer of 1 to 45, R W1 Represents an alkyl group having 1 to 12 carbon atoms or-C (= O) -R W5 ，R W5 Represents an alkyl group having 1 to 12 carbon atoms, R W2 ～R W4 Each independently represents a single bond or an alkylene group having 1 to 12 carbon atoms, and M represents a hydrogen atom, a Na atom, a K atom or an onium group.
In the formula (a 1), as R W0 Specific examples of the alkylene group include a vinyl group, a n-propylene group, an isopropylene group, a n-butylene group, an isobutylene group, a n-pentylene group, an isopentylene group, a n-hexylene group, and an isohexylene group, and preferably a vinyl group, a n-propylene group, an isopropylene group, and a n-butylene group, and particularly preferably a n-propylene group.
n W1 Preferably 1 to 10, more preferably 1 to 5, and particularly preferably 1 to 3.
As R W1 Specific examples of the alkyl group include a methyl group, an ethyl group, a n-propyl group, an isopropyl group, a n-butyl group, an isobutyl group, a tert-butyl group, a n-pentyl group, an isopentyl group, a neopentyl group, a n-hexyl group, and a n-octyl groupThe alkyl group and the n-dodecyl group are preferably methyl, ethyl, n-propyl, isopropyl, n-butyl, and tert-butyl, more preferably methyl and ethyl, and particularly preferably methyl.
R W5 Alkyl group represented by the formula and R W1 The alkyl radicals are preferably identical to R W1 The preferred modes of the alkyl groups represented are the same.
Specific examples of the group represented by the formula (a 1) are shown below, but the present invention is not limited to these. In the following structural formulae, me represents a methyl group, et represents an ethyl group, and x represents a bonding site.
[ chemical formula 18]
Figure GDA0002921369300000371
In the formulae (a 2) to (a 4), R is W2 ～R W4 Specific examples of the alkylene group include a methylene group, a vinyl group, a n-propylene group, an isopropylene group, a n-butylene group, an isobutylene group, a n-pentylene group, an isopentylene group, a n-hexylene group, an isohexylene group, a n-octylene group, and a n-dodecylene group, and preferably include a vinyl group, a n-propylene group, an isopropylene group, and a n-butylene group, and particularly preferably include a vinyl group and a n-propylene group.
In the formula (a 3), M which is present in 2 may be the same or different.
In the formulae (a 2) to (a 4), examples of the onium group represented by M include an ammonium group, an iodonium group, a phosphonium group, and a sulfonium group.
Among the groups represented by the formulae (a 1) to (a 4), the group represented by the formula (a 1) or the formula (a 4) is preferable.
In the formula 1-A, R 4 And R 5 Each is preferably an unsubstituted alkyl group. R 4 And R 5 Preferably the same group.
R 6 ～R 9 Each independently represents a hydrogen atom or an alkyl group, preferably a hydrogen atom.
Ar 1 And Ar 2 Each independently represents a group forming a benzene ring or a naphthalene ring. The above benzene ring and naphthalene ring may have a substituent. Examples of the substituent include an alkyl group, an alkoxy group, an aryloxy group, an amino group, an alkylthio group, an arylthio group, a halogen atom, a carboxyl group, a carboxylate group, a sulfo group, a sulfonate group, an alkoxycarbonyl group, an aryloxycarbonyl group, an acyloxy group, a phosphonate group, and a group obtained by combining these groups. The substituent is preferably an alkyl group.
Further, ar is Ar for increasing the maximum absorption wavelength of the compound represented by the formula 1-A to a longer wavelength, and from the viewpoint of improving color developability and the brush resistance of a lithographic printing plate 1 And Ar 2 Each independently is preferably a group forming a naphthalene ring or a benzene ring having an alkyl group or an alkoxy group as a substituent, more preferably a group forming a naphthalene ring or a benzene ring having an alkoxy group as a substituent, and particularly preferably a group forming a naphthalene ring or a benzene ring having a methoxy group as a substituent.
In formula 1-A, ar 1 Or Ar 2 Preferred is a group forming a group represented by the following formula (b 1).
[ chemical formula 19]
Figure GDA0002921369300000381
In the formula (b 1), R 19 Represents an alkyl group having 1 to 12 carbon atoms. n3 represents an integer of 1 to 4. * Indicating the bonding site.
Za represents a counter ion for neutralizing charge. The compound represented by the formula 1-a has an ionic substituent corresponding to the structure thereof, and when neutralization of charge is not required, za is not required. When Za represents an anion species, examples thereof include a sulfonate ion, a carboxylate ion, a tetrafluoroborate ion, a hexafluorophosphate ion, a hexafluoroantimonate ion, a p-toluenesulfonate ion, and a perchlorate ion, and preferably a hexafluorophosphate ion or a hexafluoroantimonate ion. When Za represents a cationic species, examples thereof include an alkali metal ion, an alkaline earth metal ion, an ammonium ion, a pyridinium ion, a sulfonium ion, and the like, preferably a sodium ion, a potassium ion, an ammonium ion, a pyridinium ion, or a sulfonium ion, and more preferably a sodium ion, a potassium ion, or an ammonium ion.
R 1 ～R 9 、R 0 、Ar 1 、Ar 2 、Y 1 And Y 2 Can have an anionic structure and a cationic structure, if R 1 ～R 9 、R 0 、Ar 1 、Ar 2 、Y 1 And Y 2 All being charge-neutral radicals, then Za is a monovalent counter anion, e.g. at R 1 ～R 9 、R 0 、Ar 1 、Ar 2 、Y 1 And Y 2 When the anion structure has 2 or more anions, za can be a counter cation.
By R in the above formula 1 and formula 1-A 1 R is an infrared ray exposure 1 The group in which the bond of-L is broken will be described later.
In the formula 1 or formula 1-A in which L is an oxygen atom, R is an oxygen atom in view of color development 1 The group represented by any one of the following formulae (1-1) to (1-7) is preferable, and the group represented by any one of the following formulae (1-1) to (1-3) is more preferable.
[ chemical formula 20]
Figure GDA0002921369300000391
In the formulae (1-1) to (1-7), ● represents a bonding site to the oxygen atom represented by L in the formula 1 or the formula 1-A, R 20 Each independently represents a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, -OR 24 、-NR 25 R 26 or-SR 27 ，R 21 Each independently represents a hydrogen atom, an alkyl group or an aryl group, R 22 Represents aryl, -OR 24 、-NR 25 R 26 、-SR 27 、-C(＝O)R 28 、-OC(＝O)R 28 Or a halogen atom, R 23 Represents an aryl, alkenyl, alkoxy or onium group, R 24 ～R 27 Each independently represents a hydrogen atom, an alkyl group or an aryl group, R 28 Represents alkyl, aryl, -OR 24 、-NR 25 R 26 or-SR 27 ，Z 1 For neutralising electricityA charged counterion.
At R 20 、R 21 And R 24 ～R 28 Preferred modes for the case of alkyl radicals with R 2 ～R 9 And R 0 The preferable mode of the alkyl group in (1) is the same.
R 20 And R 23 The alkenyl group in (b) preferably has 1 to 30 carbon atoms, more preferably 1 to 15 carbon atoms, and still more preferably 1 to 10 carbon atoms.
At R 20 ～R 28 Preferred modes for the aryl radical with R 0 The preferred mode of aryl in (1) is the same.
R in the formula (1-1) from the viewpoint of color rendering properties 20 Preferably alkyl, alkenyl, aryl, -OR 24 、-NR 25 R 26 or-SR 27 More preferably alkyl, -OR 24 、-NR 25 R 26 or-SR 27 Further preferably an alkyl group OR-OR 24 Particularly preferably-OR 24 。
And, R in the formula (1-1) 20 In the case of an alkyl group, the alkyl group may be an alkyl group having an arylthio group, an alkoxycarbonyl group or an arylsulfonyl group at the α -position, and is preferably an alkyl group having an arylthio group or an alkoxycarbonyl group at the α -position.
R in the formula (1-1) 20 is-OR 24 In the case of (1), R 24 The alkyl group is preferably an alkyl group, more preferably an alkyl group having 1 to 8 carbon atoms, yet more preferably an isopropyl group or a tert-butyl group, and particularly preferably a tert-butyl group.
R in the formula (1-1) 20 In the case of an alkenyl group, the alkenyl group may be an alkenyl group having an aryl group or a hydroxyaryl group.
R in the formula (1-2) from the viewpoint of color rendering properties 21 Preferably a hydrogen atom.
R in the formula (1-2) is a group represented by the formula 22 preferably-C (= O) OR 24 、-OC(＝O)OR 24 OR a halogen atom, more preferably-C (= O) OR 24 OR-OC (= O) OR 24 . R in the formula (1-2) 22 is-C (= O) OR 24 OR-OC (= O) OR 24 In the case of (2), R 24 Preferably an alkyl group.
R in the formula (1-3) from the viewpoint of color rendering properties 21 Each independently preferably a hydrogen atom or an alkyl group, and at least one R in the formula (1-3) 21 More preferably an alkyl group.
And, R 21 The alkyl group in (1) is preferably an alkyl group having 1 to 10 carbon atoms, and more preferably an alkyl group having 3 to 10 carbon atoms.
And, R 21 The alkyl group in (1) is preferably an alkyl group having a branched or cyclic structure, and more preferably an isopropyl group, a cyclopentyl group, a cyclohexyl group or a tert-butyl group. And, R 21 The alkyl group in (1) is preferably a secondary alkyl group or a tertiary alkyl group.
R in the formula (1-3) is a group represented by the formula 23 It is preferably an aryl group, an alkoxy group or an onium group, more preferably a p-dimethylaminophenyl group or a pyridinium group, and still more preferably a pyridinium group.
As R 23 Examples of the onium group in (1) include a pyridinium group, an ammonium group and a sulfonium group. The onium group may have a substituent. Examples of the substituent include an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an amino group, an alkylthio group, an arylthio group, a halogen atom, a carboxyl group, a sulfo group, an alkoxycarbonyl group, an aryloxycarbonyl group, and a group obtained by combining these groups.
Among them, a pyridinium group is preferable, and an N-alkyl-3-pyridinium group, an N-benzyl-3-pyridinium group, an N- (alkoxypolyalkyleneoxyalkyl) -3-pyridinium group, an N-alkoxycarbonylmethyl-3-pyridinium group, an N-alkyl-4-pyridinium group, an N-benzyl-4-pyridinium group, an N- (alkoxypolyalkyleneoxyalkyl) -4-pyridinium group, an N-alkoxycarbonylmethyl-4-pyridinium group or an N-alkyl-3,5-dimethyl-4-pyridinium group is more preferable, an N-alkyl-3-pyridinium group or an N-alkyl-4-pyridinium group is even more preferable, an N-methyl-3-pyridinium group, an N-octyl-3-pyridinium group, an N-methyl-4-pyridinium group or an N-octyl-4-pyridinium group is particularly preferable, and an N-octyl-3-pyridinium group or an N-octyl-4-pyridinium group is most preferable.
And, at R 23 In the case of a pyridinium group, as a counter anionExamples of the ion include a sulfonate ion, a carboxylate ion, a tetrafluoroborate ion, a hexafluorophosphate ion, a hexafluoroantimonate ion, a p-toluenesulfonate ion, and a perchlorate ion, and a p-toluenesulfonate ion, a hexafluorophosphate ion, and a hexafluoroantimonate ion are preferable.
R in the formula (1-4) from the viewpoint of color rendering properties 20 Preferably an alkyl or aryl group, more preferably 2R 20 One of which is an alkyl group and the other is an aryl group. The above 2R 20 May be joined to form a ring.
R in the formula (1-5) from the viewpoint of color rendering properties 20 Preferably an alkyl group or an aryl group, more preferably an aryl group, and further preferably a p-tolyl group.
R in the formula (1-6) from the viewpoint of color rendering properties 20 Each independently is preferably an alkyl or aryl group, more preferably a methyl or phenyl group.
Z in the formula (1-7) from the viewpoint of color rendering properties 1 As long as it is a counter ion for neutralizing a charge, it may be contained in the Za as a whole.
Z 1 Preferably a sulfonate ion, a carboxylate ion, a tetrafluoroborate ion, a hexafluorophosphate ion, a hexafluoroantimonate ion, a p-toluenesulfonate ion or a perchlorate ion, and more preferably a p-toluenesulfonate ion, a hexafluorophosphate ion or a hexafluoroantimonate ion.
In the case where L is an oxygen atom in formula 1 or formula 1-A, R is more preferably R from the viewpoint of color developability 1 Is a group represented by the following formula (5).
[ chemical formula 21]
Figure GDA0002921369300000411
In the formula (5), R 15 And R 16 Each independently represents a hydrogen atom, an alkyl group or an aryl group, E represents an onium group, and represents a bonding site to an oxygen atom represented by L in formula 1 or formula 1-A.
R 15 Or R 16 Alkyl group represented by the formula and R 2 ～R 9 And R 0 The alkyl in (1) is the same as R in a preferred manner 2 ～R 9 And R 0 The preferable mode of the alkyl group in (1) is the same.
R 15 Or R 16 Aryl and R 0 The aryl in (A) is the same as R in a preferred embodiment 0 The preferred mode of aryl in (1) is the same.
Onium group represented by E and R 23 In the same manner as the onium group in (1), preferably in the same manner as R 23 The preferred mode of the onium group in (1) is the same.
In the formula (5), the onium group represented by E is preferably a pyridinium group represented by the following formula (6).
[ chemical formula 22]
Figure GDA0002921369300000421
In the formula (6), R 17 Represents a halogen atom, an alkyl group, an aryl group, a hydroxyl group or an alkoxy group, in the presence of a plurality of R 17 In the case of (2), a plurality of R 17 May be the same or different, or a plurality of R 17 May be joined to form a ring. n2 represents an integer of 0 to 4. R is 18 Represents an alkyl group or an aryl group. Z b Represents a counter ion for neutralizing a charge.
R 17 Or R 18 Alkyl or aryl of formula (I) with R 2 ～R 9 And R 0 Alkyl or R in (1) 0 The aryl in (A) is the same as R in a preferred embodiment 2 ～R 9 And R 0 Alkyl or R in (1) 0 The preferred mode of aryl in (1) is the same.
R 17 The alkoxy group is preferably an alkoxy group having 1 to 10 carbon atoms, and examples thereof include a methoxy group, an ethoxy group, an n-propoxy group, an isopropoxy group, an n-butoxy group, an isobutoxy group, a tert-butoxy group and the like.
n2 is preferably 0.
Z b The counter ion for neutralizing charge represented by the formula (1-7) and Z 1 In the same manner, the preferable mode is the same as that in the formula (1-7)Z 1 The preferred manner of doing so is the same.
Hereinafter, in the case where L in the formula 1 or the formula 1-A is an oxygen atom, R is mentioned 1 Specific examples of the groups are shown, but the present invention is not limited to these. In the following structural formula, tsO - Represents a p-toluenesulfonate anion, and ● represents a bonding site to the oxygen atom represented by L of formula 1 or formula 1-A.
[ chemical formula 23]
Figure GDA0002921369300000431
[ chemical formula 24]
Figure GDA0002921369300000432
[ chemical formula 25]
Figure GDA0002921369300000441
[ chemical formula 26]
Figure GDA0002921369300000442
[ chemical formula 27]
Figure GDA0002921369300000443
[ chemical formula 28]
Figure GDA0002921369300000451
[ chemical formula 29]
Figure GDA0002921369300000452
[ chemical formula 30]
Figure GDA0002921369300000453
[ chemical formula 31]
Figure GDA0002921369300000454
In the case where L is an oxygen atom, if R 1 Is aryl or linear alkyl, does not cause R upon infrared exposure 1 -cleavage of the O bond.
In the case where L in formula 1 or formula 1-A is a sulfur atom, R 1 A group represented by the following formula (2-1) is preferred.
[ chemical formula 32]
Figure GDA0002921369300000461
In the formula (2-1), ● represents a bonding site to the sulfur atom represented by L in the formula 1 or the formula 1-A, and R 21 Each independently represents a hydrogen atom, an alkyl group or an aryl group, R 22 Represents an aryl, alkenyl, alkoxy or onium group.
L is-NR in formula 1 or formula 1-A 10 In the case of-R bonded to N 1 A group represented by the following formula (3-1) is preferred.
[ chemical formula 33]
Figure GDA0002921369300000462
In the formula (3-1), ● represents a bonding site to a nitrogen atom contained in L in the formula 1 or the formula 1-A, X 1 And X 2 Each independently represents an oxygen atom or a sulfur atom, and Y represents a group represented by the above formula (2-1).
In the above formula (2-1), with respect to R 21 And R 22 Alkyl, aryl, alkenyl groups represented byAs the alkyl group, aryl group, alkenyl group, alkoxy group and onium group, those mentioned in the above formulae (1-1) to (1-7) can be used.
In the formula 1 or the formula 1-A, L preferably represents a sulfur atom or-NR from the viewpoint of improving the brush resistance or the like 10 -and R 10 Represents a hydrogen atom, an alkyl group or an aryl group.
R in the above formula 1 and formula 1-A 1 The group represented by the following formula 2 is preferred.
The group represented by formula 2 is preferably R in formula 2 by exposure to infrared light Z -an O bond breaking group.
[ chemical formula 34]
Figure GDA0002921369300000471
In the formula 2, R Z Represents an alkyl group, and the wavy line moiety represents a bonding site to a group represented by L in formula 1 or formula 1-A.
As R Z Alkyl group represented by the formula, with the above R 2 ～R 9 And R 0 The preferable mode of the alkyl group in (1) is the same.
From the viewpoint of color developability and UV resistance of the lithographic printing plate obtained, the alkyl group is preferably a secondary alkyl group or a tertiary alkyl group, and is preferably a tertiary alkyl group.
In view of color developability and UV resistance of the lithographic printing plate obtained, the alkyl group is preferably an alkyl group having 1 to 8 carbon atoms, more preferably a branched alkyl group having 3 to 10 carbon atoms, still more preferably a branched alkyl group having 3 to 6 carbon atoms, and particularly preferably an isopropyl group or a tert-butyl group, and most preferably a tert-butyl group.
Specific examples of the group represented by the above formula 2 are given below, but the present invention is not limited to these. In the following structural formula, ● represents a bonding site to L in formula 1 or formula 1-a.
[ chemical formula 35]
Figure GDA0002921369300000472
Specific examples of the infrared absorber decomposed by infrared exposure are given below, but the present invention is not limited to these.
[ chemical formula 36]
Figure GDA0002921369300000481
[ chemical formula 37]
Figure GDA0002921369300000482
[ chemical formula 38]
Figure GDA0002921369300000483
Further, as the infrared absorber decomposed by infrared exposure, the infrared absorbers described in japanese patent application laid-open No. 2008-544322 and international publication No. 2016/027886 can be preferably used.
The infrared absorber may be used alone or in combination of two or more. As the infrared absorber, a pigment and a dye may be used together.
The content of the infrared absorber in the image recording layer is preferably 0.1 to 10.0% by mass, and more preferably 0.5 to 5.0% by mass, based on the total mass of the image recording layer.
[ relationship between Electron donating polymerization initiator, electron accepting polymerization initiator, and Infrared absorber ]
The image recording layer in the present invention contains the electron donating polymerization initiator, the electron accepting polymerization initiator, and the infrared absorber, and it is preferable that the HOMO of the electron donating polymerization initiator is-6.0 eV or more and the LUMO of the electron accepting polymerization initiator is-3.0 eV or less.
More preferred embodiments of the HOMO of the electron donating polymerization initiator and the LUMO of the electron accepting polymerization initiator are as described above.
It is presumed that in the image recording layer of the present invention, the electron donating polymerization initiator, the infrared absorber, and the electron accepting polymerization initiator transmit energy as described in the following chemical formula, for example.
Therefore, it is considered that if the HOMO of the electron donating polymerization initiator is-6.0 eV or more and the LUMO of the electron accepting polymerization initiator is-3.0 eV or less, the generation efficiency of radicals is improved, and thus the chemical resistance and the brush resistance are more easily excellent.
[ chemical formula 39]
Figure GDA0002921369300000491
From the viewpoint of brush resistance and chemical resistance, the difference between the HOMO of the electron donating polymerization initiator and the HOMO of the infrared absorber is preferably 1.00eV to-0.200 eV, and more preferably 0.700eV to-0.100 eV. In addition, a negative value indicates that the HOMO of the electron-donating polymerization initiator is higher than the HOMO of the infrared absorber.
In addition, the difference between the LUMO of the infrared absorber and the LUMO of the electron accepting type polymerization initiator is preferably 1.00eV to-0.200 eV, and more preferably 0.700eV to-0.100 eV, from the viewpoint of brush resistance and chemical resistance. In addition, a negative value indicates that the LUMO of the infrared absorber is higher than the LUMO of the electron accepting polymerization initiator.
[ Polymer particles ]
The image recording layer preferably contains polymer particles.
The polymer particles are preferably selected from the group consisting of thermoplastic polymer particles, thermally reactive polymer particles, polymer particles having a polymerizable group, microcapsules containing a hydrophobic compound, and microgels (crosslinked polymer particles). Among them, polymer particles or microgels having a polymerizable group are preferable. In a particularly preferred embodiment, the polymer particles comprise at least one ethylenically unsaturated polymerizable group. The presence of such polymer particles can provide an effect of improving the brushing resistance of exposed portions and the on-press developability of unexposed portions.
Also, the polymer particles are preferably thermoplastic polymer particles.
As the thermoplastic polymer particles, preferred are those described in, for example, the specifications of Research Disclosure No.33303, japanese patent application laid-open No. 9-123387, japanese patent application laid-open No. 9-131850, japanese patent application laid-open No. 9-171249, japanese patent application laid-open No. 9-171250, and European patent No. 931647, which are published in No. 1.1992.
Specific examples of the polymer constituting the thermoplastic polymer particles include homopolymers or copolymers of monomers such as ethylene, styrene, vinyl chloride, methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate, vinylidene chloride, acrylonitrile, vinylcarbazole, and an acrylate or methacrylate having a polyalkylene structure, and mixtures thereof. Preferably, the resin composition includes a copolymer of polystyrene, styrene and acrylonitrile, or polymethacrylic acid methyl group. The thermoplastic polymer particles preferably have an average particle diameter of 0.01 to 3.0. Mu.m.
Examples of the thermally reactive polymer particles include polymer particles having a thermally reactive group. The thermally reactive polymer particles form a hydrophobic region by crosslinking based on a thermal reaction and a change in functional group when crosslinking is performed.
The thermally reactive group in the polymer particles having a thermally reactive group may be a functional group which can form a chemical bond, and is preferably a polymerizable group, and examples thereof include an ethylenically unsaturated group (for example, acryloyl group, methacryloyl group, vinyl group, allyl group, or the like) which undergoes a radical polymerization reaction, a cationically polymerizable group (for example, vinyl group, vinyloxy group, epoxy group, oxetanyl group, or the like), an isocyanate group which undergoes an addition reaction or a block thereof, an epoxy group, a vinyloxy group, a functional group having an active hydrogen atom to be a reaction target (for example, amino group, hydroxyl group, carboxyl group, or the like), a carboxyl group which undergoes a condensation reaction, a hydroxyl group or an amino group to be a reaction target, an acid anhydride which undergoes a ring-opening addition reaction, an amino group or a hydroxyl group to be a reaction target, and the like.
As the microcapsules, at least a part of the components of the image recording layer is contained in the microcapsules, as described in, for example, japanese patent application laid-open nos. 2001-277740 and 2001-277742. The constituent components of the image recording layer may be contained outside the microcapsules. A preferable embodiment of the image recording layer containing microcapsules has a structure in which the microcapsules contain a hydrophobic constituent and the microcapsules contain a hydrophilic constituent.
The microgel (crosslinked polymer particles) can contain a part of the constituent components of the image recording layer on at least one of the surface or the inside thereof. In particular, from the viewpoint of image forming sensitivity and brushing resistance, a reactive microgel having a radical polymerizable group on the surface thereof is preferred.
In order to microencapsulate or microgel the constituent components of the image recording layer, a known method can be applied.
From the viewpoint of brush resistance, stain resistance and storage stability, the polymer particles are preferably those obtained by the reaction of a polyhydric isocyanate compound which is an adduct of a polyhydric phenol compound having 2 or more hydroxyl groups in the molecule and isophorone diisocyanate and a compound having active hydrogen.
The polyphenol compound is preferably a compound having a plurality of benzene rings having a phenolic hydroxyl group.
The compound having active hydrogen is preferably a polyol compound or a polyamine compound, more preferably a polyol compound, and still more preferably at least one compound selected from the group consisting of propylene glycol, glycerin, and trimethylolpropane.
The resin particles obtained by the reaction of the polyvalent isocyanate compound, which is an adduct of a polyvalent phenol compound having 2 or more hydroxyl groups in the molecule and isophorone diisocyanate, and the compound having active hydrogen include polymer particles described in paragraphs 0032 to 0095 of jp 2012-206495 a.
In addition, from the viewpoint of brush resistance and solvent resistance, the polymer particles preferably have a hydrophobic main chain, and include i) a constituent unit having a cyano side group directly bonded to the hydrophobic main chain and ii) a constituent unit having a side group (Pendant group) including a hydrophilic polyalkylene oxide segment.
The hydrophobic main chain preferably includes an acrylic resin chain.
Preferable examples of the cyano side group include- [ CH ] 2 CH(C≡N)-]Or- [ CH ] 2 C(CH 3 )(C≡N)-]。
Further, the constituent unit having the cyano side group can be easily derived from an ethylenically unsaturated monomer, such as acrylonitrile or methacrylonitrile, or from a combination of these.
The alkylene oxide in the hydrophilic polyalkylene oxide segment is preferably ethylene oxide or propylene oxide, and more preferably ethylene oxide.
The number of repetition of the alkylene oxide structure in the hydrophilic polyalkylene oxide segment is preferably 10 to 100, more preferably 25 to 75, and still more preferably 40 to 50.
Particles of resins having a hydrophobic main chain, i) constituent units having cyano side groups directly bonded to the hydrophobic main chain, and i i) constituent units having side groups comprising hydrophilic polyalkylene oxide segments are preferably those described in paragraphs 0039 to 0068 of japanese patent application laid-open No. 2008-503365.
The average particle diameter of the polymer particles is preferably 0.01 to 3.0. Mu.m, more preferably 0.03 to 2.0. Mu.m, and still more preferably 0.10 to 1.0. Mu.m. In this range, good resolution and stability over time can be obtained.
The average primary particle diameter of each particle in the present invention is measured by a light scattering method, or an electron micrograph of the particle is taken, and the particle diameters of 5,000 particles in total are measured on the micrograph, and the average value is calculated. In addition, regarding the non-spherical particles, the particle diameter value of spherical particles having the same particle area as the particle area on the photograph is defined as the particle diameter.
Also, the average particle diameter in the present invention is a volume average particle diameter unless otherwise specified.
The content of the polymer particles is preferably 5 to 90 mass% with respect to the total mass of the image recording layer.
[ acid developer ]
The image recording layer used in the present invention preferably contains an acid developer.
The "acid color developer" used in the present invention is a compound having a color-developing property by being heated in a state of receiving an electron-accepting compound (for example, a proton such as an acid). Particularly preferred as the acid color developer is a colorless compound having a partial skeleton such as lactone, lactam, sultone, spiropyran (Spiropyran), ester, amide, etc., and rapidly opening or breaking the partial skeleton when it comes into contact with an electron-accepting compound.
Examples of such acid-developing agents include 3,3-bis (4-dimethylaminophenyl) -6-dimethylaminophthalide (referred to as "crystal violet lactone"), 3,3-bis (4-dimethylaminophenyl) phthalide, 3- (4-dimethylaminophenyl) -3- (4-diethylamino-2-tolyl) -6-dimethylaminophthalide, 3- (4-dimethylaminophenyl) -3- (1,2-dimethylindol-3-yl) phthalide, 3- (4-dimethylaminophenyl) -3- (2-methylindol-3-yl) phthalide, 3,3-bis (1,2-dimethylindol-3-yl) -5-dimethylaminophthalide, 3,3-bis (1,2-dimethylindol-3-yl) -6-dimethylaminophthalide, 3,3-bis (9-ethylcarbazole-3-yl) -6-dimethylaminophthalide, 4264 zxft 533-dimethyl-3-yl) -3-dimethylaminophthalide, and 3- (3-dimethylaminophenyl) -3-yl) phthalide,
3,3-bis [ 1,1-bis (4-dimethylaminophenyl) ethen-2-yl ] -4,5,6,7-tetrachlorophthalide, 3,3-bis [ 1,1-bis (4-pyrrolidinophenyl) ethen-2-yl ] -4,5,6,7-tetrabenzoide, 3,3-bis [ 1- (4-dimethylaminophenyl) -1- (4-methoxyphenyl) ethen-2-yl ] -4,5,6,7-tetrachlorophthalide, 3,3-bis [ 1- (4-pyrrolidinophenyl) -1- (4-methoxyphenyl) ethen-2-yl ] -4,5,6,7-tetrachlorophthalide 3- [ 1,1-bis (1-ethyl-2-methylindol-3-yl) ethen-2-yl ] -3- (4-diethylaminophenyl) phthalide, 3- [ 1,1-bis (1-ethyl-2-methylindol-3-yl) ethen-2-yl ] -3- (4-N-ethyl-N-phenylaminophenyl) phthalide, 3- (2-ethoxy-4-diethylaminophenyl) -3- (1-N-octyl-2-methylindol-3-yl) -phthalide, 3,3-bis (1-N-octyl-2-methylindol-3-yl) -phthalide, phthalides such as 3- (2-methyl-4-diethylaminophenyl) -3- (1-n-octyl-2-methylindol-3-yl) -phthalide,
4,4-bis-dimethylaminobenzopropanol benzyl ether, N-halophenyl-leuco auramine, N-2,4,5-trichlorophenyl-leuco auramine, rhodamine-B-anilinolactam, rhodamine- (4-nitroanilino) lactam, rhodamine-B- (4-chloroanilino) lactam, 3,7-bis (diethylamino) -10-benzoylbenzoxazine, benzoyl leuco methylene blue, 4-nitrobenzoylmethylene blue,
3,6-dimethoxyfluorane, 3-dimethylamino-7-methoxyfluorane, 3-diethylamino-6-methoxyfluorane, 3-diethylamino-7-chlorofluorane, 3-diethylamino-6-methyl-7-chlorofluorane, 3-diethylamino-6,7-dimethylfluorane, 3-N-cyclohexyl-N-N-butylamino-7-methylfluorane, 3-diethylamino-7-dibenzylaminofluorane, 3-diethylamino-7-Xin An-fluorane, 3-diethylamino-7-di-N-hexylaminofluorane, 3-diethylamino-7-anilinofluorane, 3-diethylamino-7- (2 ' -fluoroanilino) fluorane, 3-diethylamino-7- (2 ' -chlorophenylamino) fluorane, 3-diethylamino-7- (3 ' -chlorophenylamino) fluorane, 3-diethylamino-7- (2 ',3' -dichlorophenylamino) fluorane, 3-diethylamino-7- (3 ' -trifluoromethylphenylamino) fluorane, 3-di-N-butylamino-7- (2 ' -fluoroanilino) fluorane, 3-di-N-butylamino-7- (2 ' -chlorophenylamino) fluorane, 3-N-isopentyl-N-ethylamino-7- (2 ' -chlorophenylamino) fluorane, methods of making and using the same,
3-N-N-hexyl-N-ethylamino-7- (2' -chlorophenylamino) fluoran, 3-diethylamino-6-chloro-7-anilinofluoran, 3-di-N-butylamino-6-chloro-7-anilinofluoran, 3-diethylamino-6-methoxy-7-anilinofluoran, 3-di-N-butylamino-6-ethoxy-7-anilinofluoran, 3-pyrrolidinyl-6-methyl-7-anilinofluoran, 3-hydropyridyl-6-methyl-7-anilinofluoran, 3-morpholinyl-6-methyl-7-anilinofluoran, 3-dimethylamino-6-methyl-7-anilinofluoran, 3-diethylamino-6-methyl-7-anilinofluoran, 3-di-N-butylamino-6-methyl-7-anilinofluoran, 3-di-N-pentylamino-6-methyl-7-anilinofluoran, 3-N-ethyl-6-methylamino-7-methylanilinofluoran, 3-di-N-butylamino-6-methyl-7-anilinofluoran, 3-N-ethyl-7-methylanilinopropyl, 3-6-methyl-7-anilinofluoran, 3-6-methyl-7-6-ethylaminofluoran, 3-methyl-7-ethylaminopropyl-6-ethylaminofluoran, and a, 3-N-N-butyl-N-methylamino-6-methyl-7-anilinofluoran, 3-N-N-butyl-N-ethylamino-6-methyl-7-anilinofluoran, 3-N-isobutyl-N-methylamino-6-methyl-7-anilinofluoran, 3-N-isobutyl-N-ethylamino-6-methyl-7-anilinofluoran, 3-N-isopentyl-N-ethylamino-6-methyl-7-anilinofluoran, 3-N-N-hexyl-N-methylamino-6-methyl-7-anilinofluoran, 3-N-cyclohexyl-N-ethylamino-6-methyl-7-anilinofluoran, 3-N-cyclohexyl-N-N-propylamino-6-methyl-7-anilinofluoran, 3-N-cyclohexyl-N-N-butylamino-6-methyl-7-anilinofluoran, 3-N-cyclohexyl-N-N-hexylamino-6-methyl-7-anilinofluoran, 3-N-cyclohexyl-6-methyl-7-anilinofluoran,
3-N- (2 '-methoxyethyl) -N-methylamino-6-methyl-7-anilinofluoran, 3-N- (2' -methoxyethyl) -N-ethylamino-6-methyl-7-anilinofluoran, 3-N- (2 '-methoxyethyl) -N-isobutylamino-6-methyl-7-anilinofluoran, 3-N- (2' -ethoxyethyl) -N-methylamino-6-methyl-7-anilinofluoran, 3-N- (2 '-ethoxyethyl) -N-ethylamino-6-methyl-7-anilinofluoran, 3-N- (3' -methoxypropyl) -N-methylamino-6-methyl-7-anilinofluoran, 3-N- (3 '-methoxypropyl) -N-ethylamino-6-methyl-7-anilinofluoran, 3-N- (3' -ethoxypropyl) -N-methylamino-6-methyl-7-anilinofluoran, 3-N- (3 '-ethoxypropyl) -N-ethylamino-7-anilinofluoran, 3-N- (2' -ethylaminomethyl-7-anilinofluoran, 3-ethylamino-6-anilinofluoran, 3-tetrahydro-6-anilinofluoran, 3262-<ref:Sup>uoran and other alkanes such as 3-N- (4 ' -methylphenyl) -N-ethylamino-6-methyl-7-anilinofluoran, 3-diethylamino-6-ethyl-7-anilinofluoran, 3-diethylamino-6-methyl-7- (3 ' -tolylamino) fluoran, 3-diethylamino-6-methyl-7- (2 ',6' -xylylamino) fluoran, 3-di-N-butylamino-7- (2 ',6' -xylylamino) fluoran, 3238 zx3238-bis [ 4' - (3-N-cyclohexyl-N-methylamino-6-methylfluoran) -7-ylaminophenyl ] propane, 3- [ 4' - (4-anilino) aminophenyl ] amino-6-methyl-7-fluoran, 3- [ 4' - (dimethylaminophenyl) ] amino-3262 zxhfluoran,
3- (2-methyl-4-diethylaminophenyl) -3- (1-ethyl-2-methylindol-3-yl) -4-azaphthalide, 3- (2-n-propoxycarbonylamino-4-di-n-propylaminophenyl) -3- (1-ethyl-2-methylindol-3-yl) -4-azaphthalide, 3- (2-methylamino-4-di-n-propylaminophenyl) -3- (1-ethyl-2-methylindol-3-yl) -4-azaphthalide, 3- (2-methyl-4-di-n-hexylaminophenyl) -3- (1-n-octyl-2-methylindol-3-yl) -4,7-diazabephthalide, a3,3-bis (2-ethoxy-4-diethylaminophenyl) -4-azaphthalide, 3,3-bis (1-n-octyl-2-methylindol-3-yl) -4-azaphthalide, 3- (2-ethoxy-4-diethylaminophenyl) -3- (1-ethyl-2-methylindol-3-yl) -4-azaphthalide, 3- (2-ethoxy-4-diethylaminophenyl) -3- (1-octyl-2-methylindol-3-yl) ) -4 or 7-azaphthalide, 3- (2-ethoxy-4-diethylaminophenyl) -3- (1-ethyl-2-methylindol-3-yl) -4 or 7-azaphthalide, 3- (2-hexyloxy-4-diethylaminophenyl) -3- (1-ethyl-2-methylindol-3-yl) -4 or 7-azaphthalide, 3- (2-ethoxy-4-diethylaminophenyl) -3- (1-ethyl-2-phenylindol-3-yl) -4 or 7-azaphthalide, 3- (2-butoxy-4-diethylaminophenyl) -3- (1-ethyl-2-phenylindol-3-yl) -4 or 7-azaphthalide 3-methyl-spiro-naphthopyran, 3-ethyl-spiro-naphthopyran, 3-phenyl-spiro-naphthopyran, 3-benzyl-spiro-naphthopyran, 3-methyl-naphthopyran- (3-methoxybenzo) spiropyran, 3-propyl-spiropyran-3238 dibenzopyran- (9 '- (9-spiro-6-fluorene, 3' - (9-6-bis (3-6-spirofluorene) fluorene, 3-methyl-naphthopyran Phthalides such as amino) phthalide,
In addition, 2 '-anilino-6' - (N-ethyl-N-isoamyl) amino-3 '-methylspiro [ isobenzofuran-1 (3H), 9' - (9H) xanthene-3-one, 2 '-anilino-6' - (N-ethyl-N- (4-tolyl)) amino-3 '-methylspiro [ isobenzofuran-1 (3H), 9' - (9H) xanthene ] -3-one, 3'-N, N-dibenzylamino-6' -N, N-diethylaminospiro [ isobenzofuran-1 (3H), 9'- (9H) xanthene ] -3-one, 2' - (N-methyl-N-phenyl) amino-6 '- (N-ethyl-N- (4-tolyl)) aminospiro [ isobenzofuran-1 (3H), 9' - (9H) xanthene ] -3-one, and the like.
Among them, the acid color developer used in the present invention is preferably at least one compound selected from the group consisting of a spiropyran compound, a spirooxazine compound, a spirolactone compound, and a spirolactam compound, from the viewpoint of color developability.
The color of the developed dye is preferably green, blue or black from the viewpoint of visibility.
As the acid-color developer, commercially available products such as ETAC, RED500, RED520, CVL, S-205, BLACK305, BLACK400, BLACK100, BLACK500, H-7001, GREEN300, NIRBLACK78, BLUE220, H-3035, BLUE203, ATP, H-1046, H-2114 (see above, fukui Yamada Chemical Co., ltd.), ANORGE-DCF, version-DCF, PINK-DCF, RED-DCF, BLMB, CVL, GREEN-DCF, TH-107 (see above, HODOYA GA CHEMICAL CO., LTD. Manufactured), ODB-2, ODB-4, ODB-250, ODB-BlackXV, BLUE-63, BLUE-502, HODOYA-169, ODG-2, yard-118, yard-40, and Crystal color lactone (see above, red Co., manufactured by Rekyo, ltd.), and crystal color lactone may be used. Among these commercially available products, ETAC, S-205, BLACK305, BLACK400, BLACK100, BLACK500, H-7001, GREEN300, NIRBLACK78, H-3035, ATP, H-1046, H-2114, GREEN-DCF, blue-63, GN-169 and crystal violet lactone are preferable because the visible light absorption of the film is good.
These acid color developers may be used alone, or two or more components may be used in combination.
The content of the acid developer is preferably 0.5 to 10% by mass, and more preferably 1 to 5% by mass, based on the total mass of the image recording layer.
[ adhesive polymers other than the specific adhesive polymer ]
The image recording layer may contain a binder polymer other than the specific binder polymer (hereinafter, also referred to as "other binder polymer").
The specific binder polymer and the polymer corresponding to the polymer particles do not correspond to the other binder polymers. That is, the other binder polymer is a polymer that does not have at least one selected from the group consisting of a structural unit formed from a styrene compound and a structural unit formed from an acrylonitrile compound and is not in a particle shape.
As the other binder polymer, a (meth) acrylic resin, a polyvinyl acetal resin, or a urethane resin is preferable.
Among them, the other binder polymers can be preferably used as well-known binder polymers used in the image-recording layer of the lithographic printing plate precursor. As an example, a binder polymer used for an on-press development type lithographic printing plate precursor (hereinafter, also referred to as an on-press development binder polymer) is described in detail.
The on-press developing binder polymer is preferably a binder polymer having an alkylene oxide chain. The adhesive polymer having an alkylene oxide chain may have a poly (alkylene oxide) site in the main chain or may have a side chain. The graft polymer may have a poly (alkylene oxide) in a side chain, or may be a block copolymer of a block material composed of a repeating unit containing a poly (alkylene oxide) and a block material composed of a repeating unit not containing a poly (alkylene oxide).
In the case where the main chain has a poly (alkylene oxide) site, a urethane resin is preferable. Examples of the polymer of the main chain in the case where the main chain has a poly (alkylene oxide) site in a side chain include a (meth) acrylic resin, a polyvinyl acetal resin, a urethane resin, a polyurea resin, a polyimide resin, a polyamide resin, an epoxy resin, a polystyrene resin, a novolac-type phenol resin, a polyester resin, a synthetic rubber, and a natural rubber, and a (meth) acrylic resin is particularly preferable.
Another preferable example of the other binder polymer is a polymer compound (hereinafter, also referred to as a star polymer compound) having a polymer chain in which a multifunctional thiol having 6 to 10 functions is bonded to a core through a thioether bond, the polymer chain having a polymerizable group. As the star polymer compound, for example, a compound described in japanese patent laid-open publication No. 2012-148555 can be preferably used.
As the star polymer compound, a compound having a polymerizable group such as an ethylenically unsaturated bond in a main chain or a side chain (preferably a side chain) for improving the film strength of an image portion is exemplified as described in jp 2008-195018 a. Crosslinking is formed between polymer molecules by the polymerizable group, and curing is promoted.
The polymerizable group is preferably an ethylenically unsaturated group such as a (meth) acrylic group, a vinyl group, an allyl group, or a vinylphenyl (styryl) group, or an epoxy group, and from the viewpoint of polymerization reactivity, a (meth) acrylic group, a vinyl group, and a vinylphenyl (styryl) group are more preferable, and a (meth) acrylic group is particularly preferable. These groups can be introduced into the polymer by a high molecular reaction and copolymerization. For example, a reaction between a polymer having a carboxyl group in a side chain and glycidyl methacrylate, or a reaction between a polymer having an epoxy group and a carboxylic acid having an ethylenically unsaturated group such as methacrylic acid can be used. These groups may be used simultaneously.
The molecular weight of the other binder polymer is preferably 2,000 or more, more preferably 5,000 or more, and still more preferably 10,000 to 300,000 in terms of polystyrene by GPC.
If necessary, a hydrophilic polymer such as polyacrylic acid or polyvinyl alcohol described in jp 2008-195018 a can be used in combination. Further, it is also possible to use both the lipophilic polymer and the hydrophilic polymer.
In the image recording layer used in the present invention, one kind of other binder polymer may be used alone, or two or more kinds may be used simultaneously.
The other binder polymer may be contained in any amount in the image recording layer, but the content of the binder polymer is preferably 1 to 90% by mass, and more preferably 5 to 80% by mass, with respect to the total mass of the image recording layer.
In the case where the image recording layer of the present invention contains another binder polymer, the content of the other binder polymer is preferably more than 0% by mass and not more than 99% by mass, more preferably 20% by mass and not more than 95% by mass, and still more preferably 40% by mass and not more than 90% by mass, based on the total mass of the specific binder polymer and the other binder polymer.
[ chain transfer agent ]
The image recording layer used in the present invention may contain a chain transfer agent. The chain transfer agent helps to improve the brush resistance in lithographic printing plates.
The chain transfer agent is preferably a thiol compound, more preferably a thiol compound having 7 or more carbon atoms from the viewpoint of a boiling point (low volatility), and still more preferably a compound having a mercapto group on an aromatic ring (aromatic thiol compound). The thiol compound is preferably a monofunctional thiol compound.
Specific examples of the chain transfer agent include the following compounds.
[ chemical formula 40]
Figure GDA0002921369300000581
[ chemical formula 41]
Figure GDA0002921369300000591
[ chemical formula 42]
Figure GDA0002921369300000592
[ chemical formula 43]
Figure GDA0002921369300000593
The chain transfer agent may be added in one kind alone, or two or more kinds may be used simultaneously.
The content of the chain transfer agent is preferably 0.01 to 50% by mass, more preferably 0.05 to 40% by mass, and still more preferably 0.1 to 30% by mass, based on the total mass of the image recording layer.
[ sensitizer ]
The image recording layer may contain a sensitizer such as a phosphonium compound, a nitrogen-containing low-molecular-weight compound, or an ammonium group-containing polymer for improving the ink-receptivity. In particular, when the overcoat layer contains an inorganic layered compound, these compounds can function as a surface coating agent for the inorganic layered compound, and can suppress a decrease in the ink adhesion during printing due to the inorganic layered compound.
The sensitizer is preferably used in combination with a phosphonium compound, a nitrogen-containing low-molecular-weight compound, and an ammonium group-containing polymer, and more preferably used in combination with a phosphonium compound, a quaternary ammonium salt, and an ammonium group-containing polymer.
Phosphonium compounds
Examples of the phosphonium compound include phosphonium compounds described in Japanese patent application laid-open Nos. 2006-297907 and 2007-050660. Specific examples thereof include tetrabutyliodophosphine, butyltriphenylphosphonium bromide, tetraphenylphosphonium bromide, 1,4-bis (triphenylphosphine) butane = bis (hexafluorophosphate), 1,7-bis (triphenylphosphine) heptane = sulfate, and 1,9-bis (triphenylphosphine) nonane = naphthalene-2,7-disulfonate.
Nitrogen-containing low molecular weight compounds
Examples of the nitrogen-containing low-molecular-weight compound include amine salts and quaternary ammonium salts. Furthermore, imidazolinium salts, benzimidazolinium salts, pyridinium salts and quinolinium salts are also included. Among them, quaternary ammonium salts and pyridinium salts are preferable. Specific examples thereof include tetramethylammonium = hexafluorophosphate, tetrabutylammonium = hexafluorophosphate, dodecyltrimethylammonium = p-toluenesulfonic acid, benzyltriethylammonium = hexafluorophosphate, benzyldimethyloctylammonium = hexafluorophosphate, benzyldimethyldodecylammonium = hexafluorophosphate, compounds described in paragraphs 0021 to 0037 of jp 2008-284858 a, compounds described in paragraphs 0030 to 0057 of jp 2009-090645 a, and the like.
Polymers containing ammonium groups
The ammonium group-containing polymer may have an ammonium group in its structure, and is preferably a polymer containing 5 to 80mol% of a (meth) acrylate having an ammonium group in a side chain as a copolymerization component. Specific examples thereof include polymers described in paragraphs 0089 to 0105 of Japanese patent application laid-open No. 2009-208458.
The value of reduced viscosity (unit: ml/g) of the ammonium group-containing polymer determined by the measurement method described in jp 2009-208458 a is preferably in the range of 5 to 120, more preferably in the range of 10 to 110, and particularly preferably in the range of 15 to 100. The reduced viscosity is preferably 10,000 to 150,000, more preferably 17,000 to 140,000, and particularly preferably 20,000 to 130,000 in terms of the weight average molecular weight (Mw).
Specific examples of the ammonium group-containing polymer are shown below.
(1) 2- (trimethylammonium) ethylmethacrylate = p-toluenesulfonate/3,6-dioxaheptyl methacrylate copolymer (molar ratio 10/90, mw4.5 ten thousand)
(2) 2- (trimethylammonium) ethyl methacrylate = hexafluorophosphate/3,6-dioxaheptyl methacrylate copolymer (molar ratio 20/80, mw6.0 ten thousand)
(3) 2- (ethyldimethylammonio) ethylmethacrylate = p-toluenesulfonate/hexyl methacrylate copolymer (molar ratio 30/70, mw4.5 ten thousand)
(4) 2- (trimethylammonium) ethyl methacrylate = hexafluorophosphate/2-ethylhexyl methacrylate copolymer (molar ratio 20/80, mw6.0 ten thousand)
(5) 2- (trimethylammonium) ethyl methacrylate = methyl sulfate/hexyl methacrylate copolymer (molar ratio 40/60, mw7.0 ten thousand)
(6) 2- (butyldimethylammonio) ethylmethacrylate = hexafluorophosphate/3,6-dioxaheptyl methacrylate copolymer (molar ratio 25/75, mw6.5 ten thousand)
(7) 2- (butyldimethylammonio) ethylacrylate = hexafluorophosphate/3,6-dioxaheptyl methacrylate copolymer (molar ratio 20/80, mw6.5 ten thousand)
(8) 2- (butyldimethylammonio) ethylmethacrylate = 13-ethyl-5,8,11-trioxa-1-heptadecanesulfonate/3,6-dioxaheptyl methacrylate copolymer (molar ratio 20/80, mw7.5 ten thousand)
The content of the sensitizer is preferably 1 to 40.0% by mass, more preferably 2 to 25.0% by mass, and still more preferably 3 to 20% by mass, based on the total mass of the image recording layer.
[ development Accelerator ]
The image recording layer used in the present invention may contain a development accelerator.
The development accelerator is preferably a hydrophilic high molecular compound or a hydrophilic low molecular compound.
In the present invention, the hydrophilic high molecular compound means a compound having a molecular weight (weight average molecular weight in the case of having a molecular weight distribution) of 3,000 or more, and the hydrophilic low molecular compound means a compound having a molecular weight (weight average molecular weight in the case of having a molecular weight distribution) of less than 3,000.
Hydrophilic polymer compounds
Examples of the hydrophilic polymer compound include a cellulose compound and polyvinyl alcohol, and a cellulose compound is preferable.
The cellulose compound includes cellulose and a compound in which at least a part of cellulose is modified (modified cellulose compound), and preferably a modified cellulose compound.
The modified cellulose compound is preferably a compound in which at least a part of the hydroxyl groups of cellulose is substituted with at least one member selected from the group consisting of alkyl groups and hydroxyalkyl groups.
The modified cellulose compound is preferably an alkyl cellulose compound or a hydroxyalkyl cellulose compound, and more preferably a hydroxyalkyl cellulose compound.
As the alkyl cellulose compound, methyl cellulose can be preferably used.
Preferred examples of the hydroxyalkyl cellulose compound include hydroxypropyl cellulose.
The molecular weight (weight average molecular weight in the case of having a molecular weight distribution) of the hydrophilic polymer compound is preferably 3,000 to 300,000, more preferably 10,000 to 150,000.
Hydrophilic low molecular weight compounds
Examples of the hydrophilic low-molecular compound include an ethylene glycol compound, a polyol compound, an organic amine compound, an organic sulfonic acid compound, an organic sulfamic acid compound, an organic sulfuric acid compound, an organic phosphonic acid compound, an organic carboxylic acid compound, and a betaine compound, and the polyol compound, the organic sulfonic acid compound, and the betaine compound are preferable.
Examples of the ethylene glycol compound include ethylene glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, and tripropylene glycol, and ether or ester derivatives of these compounds.
Examples of the polyol compound include glycerol, pentaerythritol, and tris (2-hydroxyethyl) isocyanurate.
Examples of the organic amine compound include triethanolamine, diethanolamine, monoethanolamine and salts thereof.
Examples of the organic sulfonic acid compound include alkylsulfonic acid, toluenesulfonic acid, benzenesulfonic acid and the like, and salts thereof, and preferable examples thereof include alkylsulfonic acids having an alkyl group having 8 to 20 carbon atoms.
Examples of the organic sulfamic acid compound include alkylaminosulfonic acids and salts thereof.
Examples of the organic sulfuric acid compound include alkyl sulfuric acid, alkyl ether sulfuric acid, and salts thereof.
Examples of the organic phosphonic acid compound include phenylphosphonic acid and salts thereof.
Examples of the organic carboxylic acid compound include tartaric acid, oxalic acid, citric acid, malic acid, lactic acid, gluconic acid, and salts thereof.
Examples of the betaine compound include phosphobetaine compounds, sulfobetaine compounds, and carboxybetaine compounds, and trimethylglycine is preferable.
The molecular weight (weight average molecular weight in the case of having a molecular weight distribution) of the hydrophilic low-molecular compound is preferably 50 or more and less than 3,000, and more preferably 100 to 1,000.
Content-
The content of the development accelerator is preferably 0.1% by mass or more and 20% by mass or less, more preferably 0.5% by mass or more and 15% by mass or less, and still more preferably 1% by mass or more and 10% by mass or less, relative to the total mass of the image recording layer.
[ other Components ]
The image recording layer may contain, as other components, a surfactant, a polymerization inhibitor, a higher fatty acid derivative, a plasticizer, inorganic particles, an inorganic layered compound, and the like. Specifically, reference can be made to the descriptions of paragraphs 0114 to 0159 of japanese patent application laid-open No. 2008-284817.
[ formation of image recording layer ]
The image recording layer in the lithographic printing plate precursor according to the present invention can be formed by, for example, dispersing or dissolving the above-described necessary components in a known solvent to prepare a coating liquid, applying the coating liquid on a support by a known method such as bar coating, and drying the coating liquid, as described in paragraphs 0142 to 0143 of jp 2008-195018 a. The amount of the image recording layer (solid content) after coating and drying is preferably 0.3g/m, although it varies depending on the application 2 ～3.0g/m 2 . Within this range, good sensitivity and good film properties of the image recording layer can be obtained.
As the solvent, a known solvent can be used. Specific examples of the organic solvent include water, acetone, methyl ethyl ketone (2-butanone), cyclohexane, ethyl acetate, dichloroethane, tetrahydrofuran, toluene, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol dimethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, acetylacetone, cyclohexanone, diacetone alcohol, ethylene glycol monomethyl ether acetate, ethylene glycol ethyl ether acetate, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether acetate, 1-methoxy-2-propanol, 3-methoxy-1-propanol, methoxymethoxyethanol, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, 3-methoxypropyl acetate, N-dimethylformamide, dimethyl sulfoxide, γ -butyrolactone, methyl lactate, and ethyl lactate. One solvent may be used alone, or two or more solvents may be used simultaneously. The solid content concentration in the coating liquid is preferably 1 to 50% by mass.
The amount of the image recording layer (solid content) applied after coating and drying varies depending on the application, but is preferably 0.3g/m from the viewpoint of obtaining good sensitivity and good film properties of the image recording layer 2 ～3.0g/m 2 。
The film thickness of the image recording layer in the lithographic printing plate precursor according to the present invention is preferably 0.1 to 3.0. Mu.m, and more preferably 0.3 to 2.0. Mu.m.
In the present invention, a slice cut in a direction perpendicular to the surface of the lithographic printing plate precursor is prepared for each layer thickness in the lithographic printing plate precursor, and the cross section of the slice is observed by a scanning microscope (SEM) to confirm the thickness.
< outer coating >
The lithographic printing plate precursor according to the present invention has an overcoat layer (also sometimes referred to as a "protective layer") on the surface of the image-recording layer on the side opposite to the support side.
The overcoat layer has a film thickness larger than that of the image recording layer.
In addition to the function of suppressing the image formation inhibition reaction by blocking oxygen, the overcoat layer also has the function of preventing scratches from being generated in the image recording layer and the function of preventing ablation upon exposure to high-illuminance laser light.
The overcoat layer having such properties is described in, for example, U.S. Pat. No.3,458,311 and Japanese patent publication No. 55-049729. The low oxygen-permeable polymer used in the overcoat layer may be used by appropriately selecting either one of a water-soluble polymer and a water-insoluble polymer, or may be used by mixing two or more kinds of polymers as necessary.
In the present invention, the water-soluble polymer means a polymer which is obtained by dissolving 1g or more of a polymer in 100g of pure water at 70 ℃ and does not precipitate even when a solution obtained by dissolving 1g of the polymer in 100g of pure water at 70 ℃ is cooled to 25 ℃.
Examples of the water-soluble polymer used in the overcoat layer include polyvinyl alcohol, modified polyvinyl alcohol, polyvinyl pyrrolidone, water-soluble cellulose derivatives, polyethylene glycol, and poly (meth) acrylonitrile.
As the modified polyvinyl alcohol, an acid-modified polyvinyl alcohol having a carboxyl group or a sulfo group is preferably used. Specifically, modified polyvinyl alcohols described in Japanese patent application laid-open Nos. 2005-250216 and 2006-259137 are mentioned.
The water-soluble polymer preferably contains polyvinyl alcohol, and more preferably contains polyvinyl alcohol having a saponification degree of 50% or more.
The saponification degree is preferably 60% or more, more preferably 70% or more, and still more preferably 85% or more. The upper limit of the saponification degree is not particularly limited, and may be 100% or less.
The saponification degree described above was measured according to JIS K6726: 1994, by the method described in 1994.
Further, as an embodiment of the overcoat layer, an embodiment including polyvinyl alcohol and polyethylene glycol can be preferably cited.
When the overcoat layer in the present invention contains a water-soluble polymer, the content of the water-soluble polymer is preferably 1 to 99% by mass, more preferably 3 to 97% by mass, and still more preferably 5 to 95% by mass, based on the total mass of the overcoat layer.
The overcoat layer may contain an inorganic layered compound in order to improve oxygen barrier properties. The inorganic layered compound is particles having a relatively thin flat plate-like shapeExamples thereof include mica groups such as natural mica and synthetic mica, and formulae: 3 MgO.4 SiO.H 2 Talc represented by O, taeniolite, montmorillonite, saponite, hectorite, zirconium phosphate, and the like.
The inorganic lamellar compound preferably used is a mica compound. Examples of the mica compound include: a (B, C) 2-5 D 4 O 10 (OH,F,O) 2 Wherein A is any one of K, na and Ca, B and C are any one of Fe (II), fe (III), mn, al, mg and V, and D is Si or Al. Mica groups such as natural mica and synthetic mica.
In the mica group, examples of natural mica include muscovite, paragonite, phlogopite, biotite, and lepidolite. Examples of the synthetic mica include fluorophlogopite KMg 3 (AlSi 3 O 10 )F 2 Potassium tetrasilicic mica KMg 2.5 (Si 4 O 10 )F 2 Iso-nonswelling mica and Na tetrafluoro silicon mica NaMg 2.5 (Si 4 O 10 )F 2 Na or Li with mica (Na, li) Mg 2 Li(Si 4 O 10 )F 2 Montmorillonite series Na or Li hectorite (Na, li) 1/8 Mg 2/5 Li 1/8 (Si 4 O 10 )F 2 And swelling mica. Furthermore, synthetic smectites are also useful.
Among the mica compounds, fluorine-based swellable mica is particularly useful. That is, the swelling synthetic mica has a structure consisting of
Figure GDA0002921369300000651
The metal atom substitution in the unit lattice layer of the thickness of the laminated structure is significantly larger than that of other clay minerals. As a result, a shortage of positive charge occurs in the lattice layer, and Li is adsorbed between the layers to compensate for the shortage + 、Na + 、Ca 2+ 、Mg 2+ And the like. These cations interposed between the layers are called exchangeable cations, and can be obtained by exchanging with a plurality of kinds of cations. In particular, the cation between the layers is Li + 、Na + Due to ionic moietiesThe diameter is small and the bonding between the lamellar lattices is weak, and the swelling is large by water. When a shear force is applied in this state, the layered crystal lattice is easily broken, and a stable sol is formed in water. This tendency of the swellable synthetic mica is strong, and thus it is particularly preferably used.
The shape of the mica compound is preferably as thin as possible from the viewpoint of diffusion control, and the larger the plane size is, the better the smoothness of the coated surface and the transparency of the active light ray are not hindered. Accordingly, the aspect ratio is preferably 20 or more, more preferably 100 or more, and particularly preferably 200 or more. The aspect ratio is a ratio of the length to the thickness of the particle, and can be measured, for example, by a projection view obtained from a micrograph of the particle. The larger the aspect ratio, the greater the effect obtained.
The average major axis of the particle diameter of the mica compound is preferably 0.3 to 20 μm, more preferably 0.5 to 10 μm, and particularly preferably 1 to 5 μm. The average thickness of the particles is preferably 0.1 μm or less, more preferably 0.05 μm or less, and particularly preferably 0.01 μm or less. Specifically, for example, in the case of swellable synthetic mica, which is a typical compound, the thickness is preferably about 1nm to 50nm and the planar size (major axis) is preferably about 1 μm to 20 μm.
The content of the inorganic layered compound is preferably 1 to 60% by mass, more preferably 3 to 50% by mass, based on the total solid content of the overcoat layer. When a plurality of inorganic layered compounds are used simultaneously, the total amount of the inorganic layered compounds is also preferably the above amount. Within the above range, the oxygen barrier property is improved and good sensitivity can be obtained. Further, the ink adhesion can be prevented from being lowered.
The overcoat layer may contain known additives such as a plasticizer for imparting flexibility, a surfactant for improving coatability, and inorganic particles for controlling surface slipperiness. The overcoat layer may contain a sensitizer described in the image recording layer.
The overcoat layer is applied by a known method. The coating amount (solid content) of the overcoat layer is preferably 0.01g/m 2 ～10g/m 2 More preferably 0.02g/m 2 ～3g/m 2 Particularly preferably 0.02g/m 2 ～1g/m 2 。
The thickness of the overcoat layer in the lithographic printing plate precursor according to the present invention is preferably 0.1 to 5.0. Mu.m, and more preferably 0.3 to 4.0. Mu.m.
The thickness of the overcoat layer in the lithographic printing plate precursor according to the present invention is preferably 1.1 to 5.0 times, and more preferably 1.5 to 3.0 times the thickness of the image recording layer.
< undercoat layer >
The lithographic printing plate precursor according to the present invention preferably has an undercoat layer (also sometimes referred to as an intermediate layer) between the image-recording layer and the support. The undercoat layer enhances adhesion between the support and the image recording layer in the exposed portion, and facilitates peeling of the image recording layer from the support in the unexposed portion, and therefore, the undercoat layer contributes to improvement of the developability while suppressing a decrease in the brush resistance. In addition, in the case of infrared laser exposure, the undercoat layer functions as a heat-insulating layer, and thus the effect of preventing the heat generated by exposure from diffusing to the support and decreasing the sensitivity is also obtained.
Examples of the compound used for the undercoat layer include polymers having adsorptive groups and hydrophilic groups that can be adsorbed on the surface of the support. In order to improve the adhesion to the image recording layer, a polymer having an adsorptive group and a hydrophilic group and further having a crosslinkable group is preferable. The compound used in the undercoat layer may be a low molecular compound or a polymer. Two or more compounds used for the undercoat layer may be mixed and used as necessary.
When the compound used in the undercoat layer is a polymer, a copolymer of a monomer having an adsorptive group, a monomer having a hydrophilic group, and a monomer having a crosslinkable group is preferable.
As the adsorptive group which can be adsorbed on the surface of the support, preferred are a phenolic hydroxyl group, a carboxyl group and-PO 3 H 2 、-OPO 3 H 2 、-CONHSO 2 -、-SO 2 NHSO 2 -and-COCH 2 COCH 3 . The hydrophilic group is preferably a sulfo group, a salt thereof, or a salt of a carboxyl group. The crosslinkable group is preferably an acrylic group, a methacrylic group, an acrylamide group, a methacrylamide group, an allyl group or the like.
The polymer may have a crosslinkable group introduced by formation of a polar substituent of the polymer, a substituent having a charge opposite to that of the polar substituent, and a salt of a compound having an ethylenically unsaturated bond, and may further have a monomer other than the above, preferably a hydrophilic monomer copolymerized therewith.
Specifically, a silane coupling agent having an addition polymerizable ethylenic double bond reactive group described in Japanese patent application laid-open No. H10-282679 and a phosphorus compound having an ethylenic double bond reactive group described in Japanese patent application laid-open No. H2-304441 are preferable. It is also possible to use a low-molecular or high-molecular compound having a crosslinkable group (preferably an ethylenically unsaturated bond group), a functional group that interacts with the surface of the support, and a hydrophilic group, as described in each of Japanese patent application laid-open Nos. 2005-238816, 2005-125749, 2006-239867, and 2006-215263.
More preferred examples of the compound include high molecular polymers having an adsorptive group, a hydrophilic group and a crosslinkable group, which are capable of being adsorbed on the surface of a support, as described in Japanese patent application laid-open Nos. 2005-125749 and 2006-188038.
The content of the ethylenically unsaturated bond group in the polymer used in the undercoat layer is preferably 0.1 to 10.0mmol, more preferably 0.2 to 5.5mmol, per 1g of the polymer.
The weight average molecular weight (Mw) of the polymer used in the undercoat layer is preferably 5,000 or more, and more preferably 1 to 30 ten thousand.
The undercoat layer may contain, in addition to the compound for undercoat layer, a chelating agent, a secondary or tertiary amine, a polymerization inhibitor, an amino group or a functional group having a polymerization inhibiting action, and a compound having a group that interacts with the surface of the support (for example, 1,4-diazabicyclo [2.2.2] octane ring (DABCO), 2,3,5,6-tetrahydroxy-p-benzoquinone, chloranil, sulfophthalic acid, hydroxyethylethylenediaminetriacetic acid, dihydroxyethylethylenediaminediacetic acid, hydroxyethyliminodiacetic acid, and the like) in order to prevent contamination with time.
The undercoat layer is coated by a known method. The amount of the primer coating (solid content) is preferably 0.1mg/m 2 ～100mg/m 2 More preferably 1mg/m 2 ～30mg/m 2 。
(method of manufacturing planographic printing plate and planographic printing method)
The lithographic printing plate precursor of the present invention can be subjected to image exposure and development treatment to produce a lithographic printing plate.
The method of manufacturing a lithographic printing plate according to the present invention preferably includes: a step of image-wise exposing the on-press development type lithographic printing plate precursor according to the present invention (hereinafter, also referred to as "exposure step"); and a step of supplying at least one selected from the group consisting of printing ink and fountain solution to the printing press to remove the image recording layer of the non-image portion (hereinafter, also referred to as "on-press development step").
The lithographic method according to the present invention preferably comprises: a step (exposure step) of image-wise exposing the on-press development type lithographic printing plate precursor according to the present invention; a step (on-press development step) of supplying at least one selected from the group consisting of printing ink and dampening solution to the printing press to remove the image recording layer of the non-image portion, thereby producing a lithographic printing plate; and a step (printing step) of printing using the obtained lithographic printing plate.
Preferred embodiments of the method for producing a lithographic printing plate according to the present invention and the steps of the lithographic printing method according to the present invention will be described below in order. The lithographic printing plate precursor according to the present invention can be developed with a developer.
Hereinafter, an exposure step and an on-press development step in the method for manufacturing a lithographic printing plate will be described, the exposure step in the method for manufacturing a lithographic printing plate according to the present invention is the same as the exposure step in the lithographic printing method according to the present invention, and the on-press development step in the method for manufacturing a lithographic printing plate according to the present invention is the same as the on-press development step in the lithographic printing method according to the present invention.
< Exposure Process >
The method for producing a lithographic printing plate according to the present invention preferably includes an exposure step of imagewise exposing the lithographic printing plate precursor according to the present invention to form exposed portions and unexposed portions. The lithographic printing plate precursor according to the present invention is preferably subjected to image-wise exposure by laser exposure or laser scanning based on digital data using a transparent original image having a line image, a halftone image, or the like.
The wavelength of the light source is preferably 750nm to 1,400nm. The light source of 750nm to 1,400nm is preferably a solid laser or a semiconductor laser that radiates infrared rays. Regarding the infrared laser, the output is preferably 100mW or more, the exposure time per 1 pixel is preferably within 20 microseconds, and the amount of irradiation energy is preferably 10mJ/cm 2 ～300mJ/cm 2 . Also, in order to shorten the exposure time, a multi-beam laser apparatus is preferably used. The exposure mechanism may be any of an inner drum system, an outer drum system, a flat plate system, and the like.
As for the image exposure, a plate making machine or the like can be used and performed by a conventional method. In the case of on-press development, the lithographic printing plate precursor may be mounted on a printing press and then image-exposed on the printing press.
< on-machine development Process >
The method of manufacturing a lithographic printing plate according to the present invention preferably includes an on-press development step of supplying at least one selected from the group consisting of printing ink and fountain solution to a printing press to remove an image recording layer of a non-image portion.
Hereinafter, an on-machine development method will be described.
[ on-machine development method ]
In the on-press development method, the lithographic printing plate precursor subjected to image exposure is preferably prepared by supplying an oil-based ink and an aqueous component to a printing press to remove an image-recording layer in a non-image portion.
That is, when the lithographic printing plate precursor is subjected to image exposure, then directly mounted on a printing press without performing any development treatment or after being mounted on a printing press, image exposure is performed on the printing press, and then the oil-based ink and the aqueous component are supplied and printing is performed, in the initial stage of the printing process, in the non-image portion, the image recording layer that has not been cured by either or both of the supplied oil-based ink and aqueous component is dissolved or dispersed and removed, and the hydrophilic surface is exposed in the portion. On the other hand, in the exposure portion, the image recording layer cured by exposure forms an oil-based ink-receiving portion having an oleophilic surface. The ink to be supplied to the printing surface may be an oil-based ink or an aqueous component, but the oil-based ink is preferably supplied at first from the viewpoint of preventing contamination due to the component of the image recording layer from which the aqueous component is removed. Thus, the lithographic printing plate precursor is subjected to on-press development on a printing press and is directly used in multi-sheet printing. As the oil-based ink and the aqueous component, a general lithographic printing ink and a fountain solution are preferably used.
As the laser light for image-wise exposing the lithographic printing plate precursor according to the present invention, a laser light having a light source wavelength of 300nm to 450nm or 750nm to 1,400nm is preferably used. In the case of a light source of 300nm to 450nm, a lithographic printing plate precursor containing a sensitizing dye having an absorption maximum in the wavelength region in the image recording layer is preferably used, and the above-described lithographic printing plate precursor is preferably used as a light source of 750nm to 1,400nm wavelength. The light source having a wavelength of 300nm to 450nm is preferably a semiconductor laser.
< printing Process >
The lithographic printing method according to the present invention includes a printing step of supplying printing ink to a lithographic printing plate and printing a recording medium.
The printing ink is not particularly limited, and various known inks can be used as needed. Further, as the printing ink, oil-based ink or ultraviolet curing type ink (UV ink) can be preferably used.
In the printing step, a fountain solution may be supplied as needed.
The printing step may be performed after the on-press developing step without stopping the printing press.
The recording medium is not particularly limited, and a known recording medium can be used as needed.
In the method for producing a lithographic printing plate of a lithographic printing plate precursor according to the present invention and the lithographic printing method according to the present invention, the entire surface of the lithographic printing plate precursor may be heated before exposure, during exposure, and during exposure to development, as necessary. Such heating promotes an image forming reaction in the image recording layer, and can provide advantages such as improvement in sensitivity and brush resistance and stabilization of sensitivity. The heating before development is preferably performed under mild conditions of 150 ℃ or lower. In this way, problems such as curing of the non-image portion can be prevented. The heating after the development is preferably performed under very strong conditions, and is preferably in the range of 100 to 500 ℃. Within the above range, a sufficient image-reinforcing effect can be obtained, and problems such as deterioration of the support body and thermal decomposition of the image portion can be suppressed.
Examples
The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. In the present example, "%" and "part" represent "% by mass" and "part by mass", respectively, unless otherwise specified. In addition, in the polymer compound, unless otherwise specified, the molecular weight is a weight average molecular weight (Mw), and the ratio of the structural repeating units is a mole percentage. The weight average molecular weight (Mw) is a value measured as a polystyrene conversion value by a Gel Permeation Chromatography (GPC) method.
(examples 1 to 17 and comparative examples 1 to 4)
< production of support >
For removing 0.3mm thick aluminum plate (material JIS A1050)The rolling oil on the surface was degreased with 10 mass% aqueous sodium aluminate solution at 50 ℃ for 30 seconds, and then bound nylon Long Maoshua with 3 bundles of 0.3mm in diameter and pumice-water suspension (specific gravity 1.1 g/cm) with a median particle size of 25 μm were used 3 ) The surface of the aluminum plate was granulated and thoroughly washed with water. The aluminum plate was immersed in a 25 mass% aqueous solution of sodium hydroxide at 45 ℃ for 9 seconds to be etched and washed with water, and then immersed in a 20 mass% aqueous solution of nitric acid at 60 ℃ for 20 seconds to be washed with water. The etching amount of the grained surface was about 3g/m 2 。
Next, the electrochemical graining treatment was continuously performed by using an alternating voltage of 60 Hz. The electrolyte was a1 mass% nitric acid aqueous solution (containing 0.5 mass% aluminum ions), and the liquid temperature was 50 ℃. The ac power waveform was subjected to electrochemical roughening treatment using a carbon electrode as a counter electrode, using a trapezoidal rectangular wave ac with a time TP for the current value to reach the peak value from zero of 0.8ms, a duty ratio of 1:1, and a zero-crossing current. Ferrite is used as the auxiliary anode. The current density was 30A/dm at the peak of the current 2 And 5% of the current from the power supply is shunted to the auxiliary anode. The electric quantity in the nitric acid electrolysis is 175C/dm of that when the aluminum plate is used as the anode 2 . Then, water washing was performed by a nebulizer.
Then, using an aqueous solution (containing 0.5 mass% of aluminum ions) of 0.5 mass% hydrochloric acid and an electrolyte solution having a liquid temperature of 50 ℃ and an electric energy of 50℃/dm when an aluminum plate is used as an anode 2 The electrochemical graining treatment was performed by the same method as in the nitric acid electrolysis under the conditions of (1) and then, water washing was performed by a sprayer.
Then, a 15 mass% sulfuric acid aqueous solution (containing 0.5 mass% of aluminum ions) was applied to the aluminum plate as an electrolytic solution at a current density of 15A/dm 2 Form 2.5g/m 2 The coating film was then subjected to direct current anodic oxidation, washed with water, and dried to prepare a support. The average pore diameter (surface average pore diameter) in the surface layer of the anodic oxide film was 10nm.
The pore diameter in the surface layer of the anodic oxide film was measured by observing the surface at a magnification of 15 ten thousand times using an ultra-high resolution SEM (scanning electron microscope, hitachi, S-900 manufactured by ltd.) without performing a deposition treatment for imparting conductivity at a relatively low acceleration voltage of 12V, and randomly extracting 50 pores and calculating an average value. The standard deviation is ± 10% or less of the mean.
< formation of lithographic printing plate precursor >
An undercoat liquid (1) having the following composition was applied to the support so that the amount of the applied liquid was 20mg/m in dry state 2 And dried at 100 ℃ for 30 seconds by an oven, thereby producing a support having an undercoat layer.
The following image recording layer coating liquid (1) was bar-coated on the undercoat layer, and dried at 100 ℃ for 60 seconds to form a dry coating weight of 0.60g/m 2 (film thickness = about 0.60 μm), thereby obtaining a lithographic printing plate precursor.
Thereafter, an overcoat coating liquid (1) having the following composition was applied on the image recording layer and dried at 100 ℃ for 60 seconds to give a dry coating amount of 1.0g/m 2 An overcoat layer (containing a hydrophobic portion) (film thickness = about 1.0 μm), thereby obtaining a lithographic printing plate precursor.
[ primer liquid (1) ]
The following base coating compound 1:0.18 part
Methanol: 55.24 parts
Distilled water: 6.15 parts
Synthesis of priming Compound 1
< purification of monomer M-1 >)
LIGHT ESTER P-1M (2-methacryloyloxyethyl acid phosphate, KYOEISHA CHEMICAL CO., LTD. Manufactured) 420 parts, diethylene glycol dibutyl ether 1,050 parts, and distilled water 1,050 parts were added to a separatory funnel, vigorously stirred, and then left to stand. After discarding the upper layer, 1,050 parts of diethylene glycol dibutyl ether was added thereto, and the mixture was vigorously stirred and then allowed to stand. The upper layer was discarded to obtain 1,300 parts of an aqueous solution of the monomer M-1 (10.5% by mass in terms of solid content).
< Synthesis of undercoating Compound 1 >
53.73 parts of distilled water and 3.66 parts of monomer M-2 shown below were added to a three-necked flask, and the mixture was heated to 55 ℃ under a nitrogen atmosphere. Subsequently, the dropwise addition solution 1 shown below was added dropwise over 2 hours and stirred for 30 minutes, and then 0.386 part of VA-046B (manufactured by Wako Pure Chemical Industries, ltd.) was added thereto, and the mixture was heated to 80 ℃ and stirred for 1.5 hours. After the reaction mixture was returned to room temperature (25 ℃), a 30 mass% aqueous solution of sodium hydroxide was added to adjust the pH to 8.0, and then 0.005 part of 4-hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl (4-OH-TEMPO) was added. Through the above operations, 180 parts of an aqueous solution of the undercoating compound 1 was obtained. The weight average molecular weight (Mw) as a polyethylene glycol converted value obtained by a Gel Permeation Chromatography (GPC) method was 17 ten thousand.
[ chemical formula 44]
Figure GDA0002921369300000721
(drop solution 1) >)
Aqueous solution of the above monomer M-1: 87.59 parts
The monomer M-2:14.63 parts
VA-046B (2,2' -azobis [2- (2-imidazolin-2-yl) propane ] disulfate dihydrate, wako Pure Chemical Industries, ltd.): 0.386 parts of
Distilled water: 20.95 parts
< coating liquid (1) for image recording layer >
An infrared absorber (compound of the following structure) described in table 1: 0.030 parts of
Di-to-triiodonium PF 6 Salt (manufactured by Aldrich Co.): in Table 1 is described as "presence" in the case of 0.032 parts, in the case of "not" is 0 parts
NK ester A-9300 (Shin-Nakamura Chemical Co., ltd.): 0.100 part
A-DPH (Shin-Nakamura Chemical Co., ltd.): 0.100 part
Specific binder polymers described in table 1: 0.825 part
BYK306 (Byk Chemie Co.): 0.008 parts of
1-methoxy-2-propanol: 8.609 parts
Methyl ethyl ketone: 1.091 parts
An electron donating polymerization initiator described in table 1: the amounts reported in Table 1
< overcoat coating liquid >
POVAL PVA105 (KURARAY co., ltd. System, saponification degree 80% or more): 0.6 part by mass
PEG4000 (Tokyo Chemical Industry co., ltd.): 0.39 parts by mass
Surfactant (RAPISOLA-80, manufactured by NOF CORPORATION): 0.01 part by mass
Water: the whole amount is 10 parts by mass
< evaluation >
[ Brush resistance ]
The lithographic printing plate precursors obtained in the examples and comparative examples were exposed to light at an outer drum rotation speed of 1,000rpm (resolution per minute), a laser output of 70%, and a resolution of 2,400dpi (1 inch =2.54 cm) using a lux PLATESETTER T-6000III manufactured by Fujifilm Corporation equipped with an infrared semiconductor laser. A graph of solid images and 20 μm point fm screened 50% dots is included in the exposure image.
The obtained exposed lithographic printing plate precursor was mounted on a plate cylinder of a printer LITHRONE26 manufactured by KOMORI Corporation without being subjected to a development treatment. After on-machine development was performed by supplying fountain solution and ink by the standard automatic printing start method of LITHRONE26 using ecoity-2 (manufactured by Fujifilm Corporation)/tap water =2/98 (volume ratio) fountain solution and Space Color Fusion G ink (manufactured by DIC Graphics Corporation) on the basis of decelerating the water supply roller by 5% with respect to the plate cylinder, 50,000 sheets were printed on Tokubishi Art (manufactured by mitsubishi oji Paper Sales co., ltd., continuous amount: 76.5 kg) Paper at a printing speed of 10,000 sheets per hour.
As the number of printed sheets increases, the image recording layer gradually wears and the ink receptivity decreases, so that the ink concentration in the printing paper decreases. The number of printed copies was determined by measuring the dot area ratio of 3% halftone dots in the printed matter by the use of x-lite (manufactured by x-lite corporation) and determining that the value was 5% lower than the measured value of the 100 th printed sheet, and the print durability was evaluated.
[ chemical resistance ]
The lithographic printing plate precursors of the respective examples or comparative examples were subjected to exposure and printing in the same manner as in the evaluation of the above-described brushing resistance. Chemical resistance was evaluated in the same manner as the evaluation of the brushing resistance described above, except that a step of wiping the surface of the plate with a cleaner (Fujifilm Corporation, multifunctional cleaner) was added every 5,000 sheets printed.
Specifically, the ratio of the number of completed prints in the case where the step of wiping the layout is added to the number of completed prints in the evaluation of the brushing resistance is used as an index value, and the evaluation is performed based on the following evaluation criteria.
The larger the index value, the smaller the change in the brushing resistance, and the better the chemical resistance, even when a step of wiping the surface of the printing plate with a cleaning agent is added.
Evaluation criteria-
5: an index value of 95% or more and 100% or less
4: the index value is more than 80% and less than 95%
3: the index value is more than 60% and less than 80%
2: the index value is more than 40% and less than 60%
1: the index value is less than 40 percent
[ on-machine developability ]
The lithographic printing plate precursors obtained in the respective examples or comparative examples were exposed to light at an outer drum rotation speed of 1,000rpm and a laser output of 70% with a resolution of 2,400dpi by Luxel PLATESETTER T-6000III manufactured by Fujifilm Corporation equipped with an infrared semiconductor laser. The exposure image was set to include a solid image, a graph of 20 μm dots of 50% halftone dots frequency-modulated and screened, and a non-image portion.
The obtained exposed original plate was mounted on a plate cylinder of a printer LITHONE 26 manufactured by KOMORI Corporation without being subjected to a development process. After on-line development was performed by supplying fountain solution and ink by the standard automatic printing start method of printer LITHRONE26 manufactured by KOMORI Corporation using fountain solution of ecoity-2 (manufactured by Fujifilm Corporation)/tap water =2/98 (capacity ratio) and Space Color Fusion G yellow ink (manufactured by DIC Graphics Corporation), 500 sheets were printed on Tokubishi Art (Mitsubishi Oji Paper sheets salts co., ltd., manufactured, continuous mass: 76.5 kg) Paper at a printing speed of 10,000 sheets per hour.
After the unexposed portions of the image recording layer were developed on the printing press, the number of sheets of printing paper required until the ink was not transferred to the non-image portions was measured as on-press developability. It can be said that the smaller the number of sheets, the more excellent the on-press developability.
[ inking Property (initial ink inking Property for printing) ]
The lithographic printing plate exposed under the same exposure conditions as those in the evaluation of on-press developability described above (set to a chart containing a solid image and 50% dots of 20 μm dot frequency modulation screening in the exposed image) was mounted on a plate cylinder of a printer LITHRONE26 manufactured by KOMORI Corporation. The fountain solution and the ink were supplied and printing was started by the standard automatic printing start method of LITHRONE26 using the fountain solution of ecoity-2 (manufactured by Fujifilm Corporation)/tap water =2/98 (volume ratio) and the Values-G (N) ink (manufactured by DIC Corporation), and 100 sheets were printed on Tokubishi Art (Mitsubishi Oji Paper Sales co., manufactured by ltd. Continuous volume: 76.5 kg) Paper at a printing speed of 10,000 sheets per hour.
The ink density in the solid image portion was measured using a MACBETH densitometer (exact, manufactured by X-Rite corporation), and the number of sheets of printing paper required until the number of sheets became 1.0 or more was evaluated as an index value of ink receptivity (initial ink receptivity in printing) according to the following evaluation criteria. It can be said that the smaller the number of sheets, the more excellent the ink adhesion of the lithographic printing plate.
Evaluation criteria-
1: index value of more than 100
2: index value of 50 sheets or more and less than 100 sheets
3: the index value is more than 30 and less than 50
4: index value of 20 sheets or more and less than 30 sheets
5: index value less than 20
[ Table 1]
Figure GDA0002921369300000761
In table 1, the column entitled "type" of the electron polymerization initiator indicates which of the following compounds 1 to 10 was used.
In table 1, the column "type" of the infrared absorber indicates which compound among the following infrared absorbers 1 to 5 is used. In addition, the units of HOMO and LUMO described below are eV.
In table 1, the description in the column "type" of the specific binder polymer indicates which compound among the following polymers 1 to 2 is used.
In Table 1, comparative example 2 was conducted by changing the dry coating amount of the overcoat layer to 0.1g/m 2 (film thickness = about 0.1 μm).
The details of the compounds shown in table 1 are as follows. In the following chemical structural formula, me represents a methyl group, and Bu represents a butyl group.
[ chemical formula 45]
Figure GDA0002921369300000771
[ chemical formula 46]
Figure GDA0002921369300000781
[ chemical formula 47]
Figure GDA0002921369300000782
[ Synthesis of specific Binder polymers ]
Synthesis of Binder Polymer 1
300g of methyl ethyl ketone was added to a three-necked flask, and the mixture was heated to 80 ℃ under a nitrogen stream. To the reaction vessel, a mixed solution composed of 1.0g of the following compound, 2.0 g of the following compound, 0.7g of AIBN (azobisisobutyronitrile), and 100g of methyl ethyl ketone was added dropwise over 30 minutes. After the completion of the dropwise addition, the reaction was continued for 7.5 hours. Then, AIBN0.3g was added, and the reaction was continued for 12 hours. After the reaction was completed, the reaction solution was cooled to room temperature. The composition ratio of the structural unit formed from compound 1 to the structural unit formed from compound 2 was 50 (mass ratio), and the weight average molecular weight of the binder polymer 1 was 75,000. The amount of the solid content was 20% by mass.
[ chemical formula 48]
Figure GDA0002921369300000783
Synthesis of the Binder Polymer 5
300g of methyl ethyl ketone was added to a three-necked flask, and the mixture was heated to 80 ℃ under a nitrogen stream. A mixed solution of 50.0g of compound 1, 30.0g of compound 2, 20.0g of compound 3, 0.7g of AIBN0 and 100g of methyl ethyl ketone was added dropwise to the reaction vessel over 30 minutes. After the completion of the dropwise addition, the reaction was continued for 7.5 hours. Then, 0.3g of AIBN was added and the reaction was continued for 12 hours. After the reaction was completed, the reaction solution was cooled to room temperature. The composition ratio of the structural unit formed from compound 1, the structural unit formed from compound 2, and the structural unit formed from compound 3 was 50. The amount of the solid content was 20% by mass.
[ chemical formula 49]
Figure GDA0002921369300000791
[ comparison specific adhesive Polymer (Polymer 2) ]
Polymer 2: polymethyl methacrylate (20 mass% 1-methoxy-2-propanol (MFG) solution), weight average molecular weight =75,000
From the results described in table 1, it was found that the lithographic printing plate precursor according to the example was excellent in chemical resistance, brushing resistance, and ink-staining property, and also excellent in on-press developability.
The disclosures of Japanese patent application No. 2018-142865 filed on 7/30/2018 and Japanese patent application No. 2018-205750 filed on 10/31/2018 are incorporated in their entirety into the present specification by reference.
All documents, japanese patent applications, and technical standards described in the present specification are incorporated by reference in the present specification in the same manner as in the case where each of the documents, japanese patent applications, and technical standards incorporated by reference is specifically and individually described.

Claims (22)

1. An on-press developable lithographic printing plate precursor comprising a support, an image recording layer and an overcoat layer in this order,
the image recording layer contains a binder polymer and an electron-donating polymerization initiator,
the binder polymer has a structural unit formed from an aromatic vinyl compound and a structural unit formed from an acrylonitrile compound,
the film thickness of the overcoat layer is thicker than the film thickness of the image recording layer.
2. The on-press developable lithographic printing plate precursor according to claim 1,
the image recording layer further contains a polymerizable compound, and the content of the binder polymer in the image recording layer exceeds 0 mass% and is 400 mass% or less with respect to the total mass of the polymerizable compound.
3. The on-press developable lithographic printing plate precursor according to claim 1 or 2,
the outer coating comprises a water soluble polymer.
4. The on-press developable lithographic printing plate precursor according to claim 3,
the water-soluble polymer contains polyvinyl alcohol having a saponification degree of 50% or more.
5. The on-press developable lithographic printing plate precursor according to claim 1 or 2,
the electron-donating polymerization initiator is a borate compound.
6. The on-press developable lithographic printing plate precursor according to claim 1 or 2,
the electron-donating polymerization initiator is a tetraarylborate compound.
7. The on-press developable lithographic printing plate precursor according to claim 1 or 2,
the electron donating polymerization initiator is a tetraphenylborate compound.
8. The on-press developable lithographic printing plate precursor according to claim 1 or 2,
the highest occupied molecular orbital of the electron-donating polymerization initiator is more than-6.0 eV.
9. The on-press developable lithographic printing plate precursor according to claim 1 or 2,
the image recording layer further contains an electron accepting type polymerization initiator.
10. The on-press developable lithographic printing plate precursor according to claim 9,
the electron accepting type polymerization initiator is an onium compound.
11. The on-press developable lithographic printing plate precursor according to claim 9,
the electron accepting type polymerization initiator has a lowest unoccupied molecular orbital of-3.0 eV or less.
12. The on-press developable lithographic printing plate precursor according to claim 9,
the electron accepting polymerization initiator and the electron donating polymerization initiator form a salt.
13. The on-press developable lithographic printing plate precursor according to claim 9, comprising an iodonium borate compound as the electron accepting polymerization initiator and the electron donating polymerization initiator.
14. The on-press developable lithographic printing plate precursor according to claim 1 or 2,
the binder polymer also has structural units formed from N-vinylpyrrolidone.
15. The on-press developable lithographic printing plate precursor according to claim 1 or 2,
the image recording layer further comprises an infrared absorber.
16. The on-press developable lithographic printing plate precursor according to claim 15,
the infrared absorber is decomposed by infrared exposure.
17. The on-press developing type lithographic printing plate precursor according to claim 15,
the infrared absorber is decomposed by heat, electron transfer, or both of them due to infrared exposure.
18. The on-press developable lithographic printing plate precursor according to claim 15,
the infrared absorbent is cyanine pigment.
19. The on-press developable lithographic printing plate precursor according to claim 15,
the infrared absorber is a compound represented by the following formula 1,
Figure FDA0002921369290000021
in the formula 1, R 1 Represents R by infrared ray exposure 1 -L bond-breaking group, R 11 ～R 18 Independently represent a hydrogen atom, a halogen atom, -Ra, -ORb, -SRc or-NRdRe, ra to Re independently represent a hydrocarbon group, A 1 、A 2 And a plurality of R 11 ～R 18 Optionally linked to form a monocyclic or polycyclic ring, A 1 And A 2 Each independently represents an oxygen atom, a sulfur atom or a nitrogen atom, n 11 And n 12 Each independently represents an integer of 0 to 5, wherein n 11 And n 12 Is 2 or more in total, n 13 And n 14 Each independently represents 0 or 1,L represents an oxygen atom, a sulfur atom or-NR 10 -，R 10 Represents a hydrogen atom, an alkyl group or an aryl group, and Za represents a counter ion for neutralizing a charge.
20. The on-press developable lithographic printing plate precursor according to claim 19,
r in the formula 1 1 Is a group represented by the following formula 2,
Figure FDA0002921369290000031
in the formula 2, R Z Represents an alkyl group, and the wavy line moiety represents a bonding site to a group represented by L in the formula 1.
21. A method of making a lithographic printing plate, the method comprising:
a step of image-wise exposing the on-press development type lithographic printing plate precursor of any one of claims 1 to 20; and
and a step of supplying at least one selected from printing ink and dampening solution to the printing press to remove the image recording layer of the non-image portion.
22. A method of lithography, the method comprising:
a step of image-wise exposing the on-press development type lithographic printing plate precursor according to any one of claims 1 to 20;
a step of supplying at least one selected from printing ink and dampening solution, removing the image recording layer of the non-image portion on a printing machine, and producing a lithographic printing plate; and
and a step of performing printing using the obtained lithographic printing plate.
CN201980050526.1A 2018-07-30 2019-07-17 On-press developable lithographic printing plate precursor, method for producing lithographic printing plate, and lithographic printing method Active CN112512824B (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2018142865 2018-07-30
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