EP0908305B2 - Verfahren zur Herstellung einer positiv arbeitenden Druckplatte aus wärmeempflindlichem Bildaufzeichnungsmaterial - Google Patents

Verfahren zur Herstellung einer positiv arbeitenden Druckplatte aus wärmeempflindlichem Bildaufzeichnungsmaterial Download PDF

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Publication number
EP0908305B2
EP0908305B2 EP98203120A EP98203120A EP0908305B2 EP 0908305 B2 EP0908305 B2 EP 0908305B2 EP 98203120 A EP98203120 A EP 98203120A EP 98203120 A EP98203120 A EP 98203120A EP 0908305 B2 EP0908305 B2 EP 0908305B2
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EP
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Prior art keywords
layer
printing plates
lithographic printing
imaging element
plates according
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EP98203120A
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English (en)
French (fr)
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EP0908305B1 (de
EP0908305A1 (de
Inventor
Geert Deroover
Joan Vermeersch
Marc Van Damme
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Agfa Gevaert NV
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Agfa Gevaert NV
Agfa Gevaert AG
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Classifications

    • 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
    • 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
    • B41C2210/02—Positive working, i.e. the exposed (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
    • B41C2210/06—Developable by an alkaline 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
    • B41C2210/14—Multiple imaging layers
    • 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
    • B41C2210/22—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by organic non-macromolecular additives, e.g. dyes, UV-absorbers, plasticisers
    • 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
    • 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
    • B41C2210/26—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 not involving carbon-to-carbon unsaturated bonds
    • B41C2210/262—Phenolic condensation polymers, e.g. novolacs, resols

Definitions

  • the present invention relates to a method for preparing a lithographic printing plate using a heat mode imaging element comprising an IR sensitive top layer.
  • the invention is related to a method for preparing a lithographic printing plate using a heat mode imaging element whereby the capacity of the top layer of being penetrated and/or solubilised by an aqueous developer is changed upon exposure.
  • Lithography is the process of printing from specially prepared surfaces, some areas of which are capable of accepting lithographic ink, whereas other areas, when moistened with water, will not accept the ink.
  • the areas which accept ink form the printing image areas and the ink-rejecting areas form the background areas.
  • a photographic material is made imagewise receptive to oily or greasy inks in the photo-exposed (negative-working) or in the non-exposed areas (positive-working) on a hydrophilic background.
  • lithographic printing plates also called surface litho plates or planographic printing plates
  • a support that has affinity to water or obtains such affinity by chemical treatment is coated with a thin layer of a photosensitive composition.
  • Coatings for that purpose include light-sensitive polymer layers containing diazo compounds, dichromate-sensitized hydrophilic colloids and a large variety of synthetic photopolymers. Particularly diazo-sensitized systems are widely used.
  • the exposed image areas become insoluble and the unexposed areas remain soluble.
  • the plate is then developed with a suitable liquid to remove the diazonium salt or diazo resin in the unexposed areas.
  • printing plates are known that include a photosensitive coating that upon image-wise exposure is rendered soluble at the exposed areas. Subsequent development then removes the exposed areas.
  • a typical example of such photosensitive coating is a quinone-diazide based coating.
  • the above descnbed photographic materials from which the printing plates are made are camera-exposed through a photographic film that contains the image that is to be reproduced in a lithographic printing process.
  • Such method of working is cumbersome and labor intensive-
  • the printing plates thus obtained are of superior lithographic quality.
  • GB-1 492 070 discloses a method wherein a metal layer or a layer containing carbon black is provided on a photosensitive coating. This metal layer is then ablated by means of e laser so that an image mask on the photosensitive layer is obtained. The photosensitive layer is then overall exposed by UV-light through the image mask. After removal of the image mask, the photosensitive layer is developed to obtain a printing plate.
  • This method however still has the disadvantage that the image mask has to be removed prior to development of the photosensitive layer by a cumbersome processing.
  • thermoplastic polymer particles By image-wise exposure to an infrared laser, the thermoplastic polymer particles are image-wise coagulated thereby rendering the surface of the imaging element at these areas ink-acceptant without any further development.
  • a disadvantage of this method is that the printing plate obtained is easily damaged since the non-printing areas may become ink accepting when some pressure is applied thereto. Moreover, under critical conditions, the lithographic performance of such a printing plate may be poor and accordingly such printing plate has little lithographic printing latitude.
  • US-P-4 708 925 discloses imaging elements including a photosensitive composition comprising an alkali-soluble novolac resin and an onium-salt. This composition can optionally contain an IR-sensitizer. After image-wise exposing said imaging element to UV - visible - or IR-radiation followed by a development step with an aqueous alkali liquid there is obtained a positive or negative working printing plate. The printing results of a lithographic plate obtained by irradiating and developing said imaging element are poor.
  • EP-A-625 728 discloses an imaging element comprising a layer which is sensitive to UV- and IR-irradiation and which can be positive or negative working.
  • This layer comprises a resole resin, a novolac resin, a latent Bronsted acid and an IR-absorbing substance.
  • the printing results of a lithographic plate obtained by irradiating and developing said imaging element are poor.
  • US-P-5 340 699 is almost identical with EP-A-625 728 but discloses the method for obtaining a negative working IR-laser recording imaging element.
  • the IR-sensitive layer comprises a resole resin, a novolac resin, a latent Bronsted acid and an IR-absorbing substance.
  • the printing results of a lithographic plate obtained by irradiating and developing said imaging element are poor.
  • EP-A-678 380 discloses a method wherein a protective layer is provided on a grained metal support underlying a laser-ablatable surface layer. Upon image-wise exposure the surface layer is fully ablated as well as some parts of the protective layer. The printing plate is then treated with a cleaning solution to remove the residu of the protective layer and thereby exposing the hydrophilic surface layer.
  • EP-A-97 200 588.8 discloses a heat mode imaging element for making lithographic printing plates comprising on a lithographic base having a hydrophilic surface an intermediate layer comprising a polymer, soluble in an aqueous alkaline solution and a top layer that is sensitive to IR-radiation wherein said top layer upon exposure to IR-radiation has a decreased or increased capacity for being penetrated and/or solubilised by an aqueous alkaline solution. This material does not give a selective dissolution of the exposed or unexposed parts of the top and intermediate layer.
  • the above discussed systems have one or more disadvantages e.g. low infrared sensitivity, need for a preheating step (complex processing), are not imageable at short as well as at long pixel dwell times, lack a selective dissolution of the exposed or unexposed parts of the top and intermediate layer or said dissolution(development) is slow.
  • disadvantages e.g. low infrared sensitivity, need for a preheating step (complex processing), are not imageable at short as well as at long pixel dwell times, lack a selective dissolution of the exposed or unexposed parts of the top and intermediate layer or said dissolution(development) is slow.
  • GB-A-1 155 035 discloses a method of recording information, wherein a recording material is used comprising a layer of a polymeric material which when any given area of the layer is sufficiently heated undergoes in that area a modification resulting in a decrease in the solubility of that area of the layer in water or an aqueous medium, such layer also incorporating a substance or substances distributed over the whole area of the layer and being capable of being heated by exposing the layer to intense radiant energy which is absorbed by such substance or substances, and wherein the said material is exposed to intense radiant energy which is distributed over the material in a pattern determined by the information to be recorded and which is at least partly absorbed by said distributed substance or substances, so that a corresponding heat pattern is generated in the material, whereby such information is recorded in terms of a difference in the solubilities in water or an aqueous medium of different areas of said layer.
  • GB-A-1 245 924 discloses an information recording method wherein a recording material is used comprising a heat-sensitive recording layer of a composition such that the solubility of any given area of the layer in a given solvent can be increased by heating that area of the layer, wherein the said layer is information-wise heated to produce a record of the information in terms of a difference in the solubilities in the said solvent of different areas of the recording layer, and wherein the whole layer is then contacted with such scivent to cause the portions of the recording layer which are soluble or most soluble in such solvent to be removed or penetrated by such solvent.
  • US-P-5 466 557 discloses a radiation-sensitive composition
  • a radiation-sensitive composition comprising (1) a resole resin, (2) a novolac resin, (3) a latent Bronsted acid, (4) an infrared absorber, and (5) terephthalaldshyde.
  • GB-A-1 154 568 discloses a method of recording a graphic original having contrasting light-absorbing and light-transmitting areas, wherein a recording material comprising a supported layer composed mainly of gelatin the water-solubility or water-absorptive capacity of which increases if the layer is sufficiently heated, such layer also having light absorbing substance(s) distributed therein, is placed with such gelatin layer in contact with the light-absorbing areas of the original and the said gelatin layer is exposed to light through the original, the intensity of the light and the duration of the exposure being such that the areas of the gelatin layer in contact with the light-absorbing areas of the original are substantially unaffected by heat conduction from such light-absorbing areas, but the water-solubility or water-absorptive capacity of the other areas of the gelatin layer is increased by heating thereof due to absorption of copying light by the light-absorbing substance(s) in those other areas of the gelatin layer.
  • lithographic printing plates including the following steps:
  • lithographic printing plates including the following steps:
  • the top layer in accordance with the present invention comprises an IR cyanine-dye and a binder resin.
  • a mixture of IR cyanine-dyes may be used, but it is preferred to use only one IR cyanine-dye.
  • Particularly useful IR-cyanine dyes are cyanines dyes with two acid groups, more preferably with two sulphonic groups. Still more preferably are cyanines dyes with two indolenine two sulphonic acid groups. Most preferably is compound I with the structure as indicated
  • the top layer can comprise as binder a water insoluble polymer such as a cellulose ester, a copolymer of vinylidene chloride and acrylonitrile, poly(meth)acrylates, polyvinyl chloride, silicone resins, etc.
  • a water insoluble polymer such as a cellulose ester, a copolymer of vinylidene chloride and acrylonitrile, poly(meth)acrylates, polyvinyl chloride, silicone resins, etc.
  • the top layer comprises as a binder resin in accordance with the present invention preferably a water soluble polymer.
  • a protein preferably gelatin may be used.
  • synthetic, seml-synthetic, or natural water soluble polymers may be used.
  • Synthetic polymers are e.g. polyvinyl alcohol, poly-N-vinyl pyrrolidone, polyvinyl imidazole, polyvinyl pyrazole, polyacrylamide, and derivatives thereof, in particular copolymers thereof.
  • Natural substitutes for gelatin are e.g. other proteins such as zein, albumin and casein, cellulose, saccharides, starch, and alginates.
  • the semi-synthetic substitutes for gelatin are modified natural products e.g. gelatin derivatives obtained by conversion of gelatin with alkylating or acylating agents or by grafting of polymerizable monomers on gelatin, and cellulose derivatives such as hydroxyalkyl cellulose, carboxymethyl cellulose, phthaloyl cellulose, and cellulose sulphates.
  • modified natural products e.g. gelatin derivatives obtained by conversion of gelatin with alkylating or acylating agents or by grafting of polymerizable monomers on gelatin
  • cellulose derivatives such as hydroxyalkyl cellulose, carboxymethyl cellulose, phthaloyl cellulose, and cellulose sulphates.
  • Said first layer preferably also includes a low molecular acid, preferably a carboxylic acid, still more preferably a benzoic acid, most preferably 3,4,5-trimethoxybenzoic acid.
  • a low molecular acid preferably a carboxylic acid, still more preferably a benzoic acid, most preferably 3,4,5-trimethoxybenzoic acid.
  • the ratio between the total amount of low molecular acid and polymer in the first layer preferably ranges from 2:98 to 40:60, more preferably from 5:95 to 20:80.
  • the total amount of said first layer preferably ranges from 0.1 to 10 g/m 2 , more preferably from 0.3 to 2 g/m 2 .
  • the lithographic base can be an anodised aluminum.
  • a particularly preferred lithographic base is an electrochemically grained and anodised aluminum support.
  • the anodised aluminum support may be treated to improve the hydrophilic properties of its surface.
  • the aluminum support may be silicated by treating its surface with sodium silicate solution at elevated temperature, e.g. 95°C.
  • a phosphate treatment may be applied which involves treating the aluminum oxide surface with a phosphate solution that may further contain an inorganic fluoride.
  • the aluminum oxide surface may be rinsed with a citric acid or citrate solution. This treatment may be carried out at room temperature orcan be carried out at a slightly elevated temperature of about 30 to 50°C.
  • a further interesting treatment involves rinsing the aluminum oxide surface with a bicarbonate solution.
  • the aluminum oxide surface may be treated with polyvinylphosphonic acid, polyvinylmethylphosphonic acid, phosphoric acid esters of polyvinyl alcohol, polyvinylsulphonic acid, polyvinylbenzenesulphonic acid, sulphuric acid esters of polyvinyl alcohol, and acetals of polyvinyl alcohols formed by reaction with a sulphonated aliphatic aldehyde it is further evident that one or more of these post treatments may be carried out alone or in combination.
  • the lithographic base having a hydrophilic surface comprises a flexible support, such as e.g. paper or plastic film, provided with a cross-linked hydrophilic layer.
  • a particularly suitable cross-linked hydrophilic layer may be obtained from a hydrophilic binder cross-linked with a cross-linking agent such as formaldehyde, glyoxal, polyisocyanate or a hydrolysed tetra-alkylorthosilficate. The latter is particularly preferred.
  • hydrophilic binder there may be used hydrophilic (co)polymers such as for example, homopolymers and copolymers of vinyl alcohol, acrylamide, methylol acrylamide, methylol methacrylamide, acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxyethyl methacrylate or maleic anhydride/vinylmethylether copolymers.
  • the hydrophilicity of the (co)polymer or (co)polymer mixture used is preferably the same as or higher than the hydrophilicity of polyvinyl acetate hydrolyzed to at least an extent of 60 percent by weight, preferably 80 percent by weight.
  • the amount of crosslinking agent, in particular of tetraalkyl orthosilicate, is preferably at least 0.2 parts by weight per part by weight of hydrophilic binder, more preferably between 0.5 and 5 parts by weight, most preferably between 1.0 parts by weight and 3 parts by weight.
  • a cross-linked hydrophilic layer in a lithographic base used in accordance with the present embodiment preferably also contains substances that increase the mechanical strength and the porosity of the layer.
  • colloidal silica may be used.
  • the colloidal silica employed may be in the form of any commercially available water-dispersion of colloidal silica for example having an average particle size up to 40 nm, e.g. 20 nm.
  • inert particles of larger size than the colloidal silica can be added e.g. silica prepared according to Stöber as described in J. Colloid and interface Sci., Vol.
  • alumina particles or particles having an average diameter of at least 100 nm which are particles of titanium dioxide or other heavy metal oxides.
  • the thickness of a cross-linked hydrophilic layer in a lithographic base in accordance with this embodiment may vary in the range of 0.2 to 25 ⁇ m and is preferably 1 to 10 ⁇ m.
  • cross-linked hydrophilic layers for use in accordance with the present invention are disclosed in EP-A-601 240, GB-P-1 419 512, FR-P-2 300 354, US-P-3 971 660, US-P-4 284 705 and EP-A- 514 490 .
  • plastic film e.g. substrated polyethylene terephthalate film, cellulose acetate film, polystyrene film, polycarbonate film etc.
  • the plastic film support may be opaque or transparent.
  • the amount of silica in the adhesion improving layer is between 200 mg per m 2 and 750 mg per m 2 .
  • the ratio of silica to hydrophilic binder is preferably more than 1 and the surface area of the colloidal silica is preferably at least 300 m 2 per gram, more preferably at least 500 m 2 per gram.
  • Image-wise exposure in connection with the present invention is an image-wise scanning exposure involving the use of a laser that operates in the infrared or near-infrared, i.e. wavelength range of 700-1500 nm. Most preferred are laser diodes emitting in the near-infrared. Exposure of the imaging element can be performed with lasers with a short as well as with lasers with a long pixel dwell time. Preferred are lasers with a pixel dwell time between 0.005 ⁇ s and 20 ⁇ s.
  • the heat mode imaging element is developed by rinsing it with an aqueous alkaline solution.
  • the aqueous alkaline solutions used in the present invention are preferably those that are used for developing conventional positive working presensltised printing plates and have preferably a pH between 11.5 and 14.
  • the imaged parts of the top layer that were rendered more penetrable for the aqueous alkaline solution upon exposure and the corresponding parts of the underlying layer are cleaned-out whereby a positive working printing plate is obtained.
  • the composition of the developer used is also very important.
  • the developers and replenishers for developer used in the invention are preferably aqueous solutions mainly composed of alkali metal silicates and alkali metal hydroxides represented by MOH or their oxyde, represented by M 2 O, wherein said developer comprises SiO 2 and M 2 O in a molar ratio of 0.5 to 1.5 and a concentration of SiO 2 of 0.5 to 5% by weight.
  • alkali metal silicates preferably used are, for instance, sodium silicate, potassium silicate, lithium silicate and sodium metasilicate.
  • alkali metal hydroxides preferred are sodium hydroxide, potassium hydroxide and lithium hydroxide.
  • the developers used in the invention may simultaneously contain other alkaline agents.
  • other alkaline agents include such inorganic alkaline agents as ammonium hydroxide, sodiumtertiary phosphate, sodium secondary phosphate, potassium tertiary phosphate, potassium secondary phosphate, ammonium tertiary phosphate, ammonium secondary phosphate, sodium bicarbonate, sodium carbonate, potassium carbonate and ammonium carbonate; and such organic alkaline agents as mono-, di- or triethanolamine, mono-, di- or trimethylamine, mono-, di- or triethylamine, mono- or diisopropylamine, n-butylamine, mono-, di- or triisopropanolamine, ethyleneimine, ethylenediimine and tetramethylammonium hydroxide.
  • the concentration of SiO 2 in the developer and replenisher preferably ranges from 1 to 4 % by weight. Such limitation of the concentration of SiO 2 makes it possible to stably provide lithographic printing plates having good finishing qualities even when a large amount of plates according to the invention are processed for a long time period.
  • an aqueous solution of an alkali metal silicate having a molar ratio [SiO 2 ] / [M 2 O], which ranges from 1.0 to 1.5 and a concentration of SiO 2 of 1 to 4 % by weight is used as a developer.
  • a replenisher having alkali strength equal to or more than that of the developer is employed.
  • a molar ratio, [SiO 2 ] / [M 2 O] of the replenisher is equal to or smaller than that of the developer, or that a concentration of SiO 2 is high if the molar ratio of the developer is equal to that of the replenisher.
  • organic solvents having solubility in water at 20 °C of not more than 10 % by weight according to need.
  • organic solvents are such carboxilic acid esters as ethyl acetate, propyl acetate, butyl acetate, amyl acetate, benzyl acetate, ethylene glycol monobutyl acetate, butyl lactate and butyl levulinate; such ketones as ethyl butyl ketone, methyl isobutyl ketone and cyclohexanone; such alcohols as ethylene glycol monobutyl ether, ethylene glycol benzyl ether, ethylene glycol monophenyl ether, benzyl alcohol, methylphenylcarbinol, n-amyl alcohol and methylamyl alcohol; such alkyl-substituted aromatic hydrocarbons as xylene; and such halogenated hydrocarbons
  • organic solvents may be used alone or in combination. Particularly preferred is benzyl alcohol in the invention. These organic solvents are added to the developer or replenisher therefor generally in an amount of not more than 5 % by weight and preferably not more than 4 % by weight.
  • the developers and replenishers used in the present invention may simultaneously contain a surfactant for the purpose of improving developing properties thereof.
  • surfactants include salts of higher alcohol (C8 - C22) sulfuric acid esters such as sodium salt of lauryl alcohol sulfate, sodium salt of octyl alcohol sulfate, ammonium salt of lauryl alcohol sulfate, Teepol B-81 (trade mark, available from Shell Chemicals Co., Ltd.) and disodium alkyl sulfates; salts of aliphatic alcohol phosphoric acid esters such as sodium salt of cetyl alcohol phosphate; alkyl aryl sulfonic acid salts such as sodium salt of dodecylbenzene sulfonate, sodium salt of isopropylnaphthalene sulfonate, sodium salt of dinaphthalene disulfonate and sodium salt of metanitrobenzene sulfonate; sulfonic acid salts of alkylamides
  • Examples of such compounds are neutral salts such as NaCl, KCl and KBr as disclosed in JN-A-58-75152 ; chelating agents such as EDTA and NTA as disclosed in JN-A-58-190 952 (U.S-A-4 469 776) , complexes such as [Co(NH3)6]Cl3 as disclosed in JN-A-59-121 336 (US-A-4 606 995) ; ionizable compounds of elements of the group IIa, IIIa or IIIb of the Periodic Table such as those disclosed in JN-A-55-25 100 ; anionic or amphoteric surfactants such as sodium alkyl naphthalene sulfonate and N-tetradecyl-N,N-dihydroxythyl betaine as disclosed in JN-A-50-51 324; tetramethyldecyne diol as disclosed in US-A-4 374 920 ; non-ionic surfactants as disclosed in JN-
  • the printing plate of the present invention can also be used in the printing process as a seamless sleeve printing plate.
  • the printing plate is soldered in a cylindrical form by means of a laser.
  • This cylindrical printing plate which has as diameter the diameter of the print cylinder is slided on the print cylinder instead of applying in a classical way a classically formed printing plate. More details on sleeves are given in "Grafisch Nieuws" ed. Keesing, 15, 1995, page 4 to 6.
  • the obtained plate After the development of an image-wise exposed imaging element with an aqueous alkaline solution and drying, the obtained plate can be used as a printing plate as such. However, to improve durability it is still possible to bake said plate at a temperature between 200°C and 300°C for a period of 30 seconds to 5 minutes. Also the imaging element can be subjected to an overall post-exposure to UV-radiation to harden the image in order to increase the run lenght of the printing plate.
  • EXAMPLE 1 Positive working thermal plate based on an alkali-soluble binder.
  • a 0.20 mm thick aluminum foil was degreased by immersing the foil in an aqueous solution containing 5 g/l of sodium hydroxide at 50°C and rinsed with demineralized water.
  • the foil was then electrochemically grained using an alternating current in an aqueous solution containing 4 g/l of hydrochloric acid, 4 g/l of hydroboric acid and 5 g/l of aluminum ions at a temperature of 35°C and a current density of 1200 A/m 2 to form a surface topography with an average center-line roughness Ra of 0.5 mm.
  • the aluminum foil was then etched with an aqueous solution containing 300 g/l of sulfuric acid at 60°C for 180 seconds and rinsed with demineralized water at 25°C for 30 seconds.
  • the foil was subsequently subjected to anodic oxidation in an aqueous solution containing 200 g/l of sulfuric acid at a temperature of 45°C, a voltage of about 10 V and a current density of 150 A/m 2 for about 300 seconds to form an anodic oxidation film of 3.00 g/m 2 of Al 2 O 3 then washed with demineralized water, posttreated with a solution containing polyvinylphosphonic acid and then with a solution containing aluminum trichloride, subsequently rinsed with demineralized water at 20°C during 120 seconds and dried.
  • Both materials were imaged with an external drum IR-laser imaging apparatus (diode laser 830 nm, drum-speed 3.2 m/s, addressability 3600 dpi, power level in image plane 80-120 mW), and developed in an alkaline silicate containing developing solution (75% EP 26 developer commercially available from Agfa), containing 1.16 weight percent of SiO 2 and a molar ratio of [SiO 2 ] to [Na 2 O] of 0.59., dissolving very rapidly the exposed parts. With the material having no IR cyanine dye in the toplayer the non exposed parts were also rapidly dissolved; a selective dissolution of the exposed parts was not possible. With the material I containing an IR cyanine cyanine dye a selective dissolution of the exposed parts was obtained.
  • EXAMPLE 2 Positive working thermal plate based on an alkali-soluble binder
  • a heat mode material III was prepared in an identical way as material I except that the top layer contained 0.06 g/m 2 of Carbon black (trade name Printex L6) and 0.54 g/m 2 polyacrylic acid(Carbopol WS 801 from Goodrichg)
  • Materials I and III were imaged with an external drum iR-iaser imaging apparatus (diode laser 830 nm, drum-speed 3.2 m/s, addressability 3600 dpi, power level in image plane 80-120 mW), and developed in an alkaline silicate containing developing solution (75% EP 26 developer commercially available from Agfa), containing 1.16 weight percent of SiO 2 and a molar ratio of [SiO 2 ] to [Na 2 O] of 0.59.dissolving very rapidly the exposed parts. With the material having no IR-cyanine dye in the toplayer the non exposed parts were also rapidly dissolved; a selective dissolution of the exposed parts was not possible. With the material I containing an IR cyanine dye a selective dissolution of the exposed parts was obtained.
  • EXAMPLE 3 Positive working thermal plate based on an alkali-soluble binder
  • a lithographic base as described above is coated a first layer identical with the first layer of example 1 but at a concentration of 3% and at a wet coating thickness of 30 ⁇ m giving a dry weight of 0.90 g/m 2 .
  • This material was imaged with an external drum IR-laser imaging apparatus (diode laser 830 nm, drumdpeed 3.2 m/s, addressability 3600 dpi, power level in image plane 80-120 mW), and developed in an alkaline silicate containing developing solution (75% EP 26 developer commercially available from Agfa), containing 1.16 weight percent of SiO 2 and a molar ratio of [SiO 2 ] to [Na 2 O] of 0.59.dissolving very rapidly the exposed parts.
  • This plate was printed on a Heidelberg GTO 46 printing machine with a conventional ink (K+E197) and fountain solution (Rotamatic) resulting in good prints, i.e. no scumming in non imaged parts and good ink-uptake in imaged parts for more than 17,000 copies.
  • EXAMPLE 4 Positive working thermal plate based on an alkali-soluble binder
  • This material was imaged with an external drum IR-Laser imaging apparatus (diode laser 830 nm, drumdpeed 3.2 m/s, addressability 3600 dpi, power level in image plane 80-120 mW), and developed in an alkaline silicate containing developing solution (75% EP 26 developer commeroially available from Agfa), containing 1.16 weight percent of SiO 2 and a molar ratio of [SiO 2 ] to [Na 2 O] of 0.59.dissolving very rapidly the exposed parts.
  • This plate was printed on a Heidelberg GTO 46 printing machine with a conventional ink (K+E197) and fountain solution (Rotamatic) resulting in good prints, i.e. no scumming in non imaged pars and good ink-uptake in imaged parts for more than 17,000 copies.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Materials For Photolithography (AREA)

Claims (11)

  1. Ein durch die nachstehenden Schritte gekennzeichnetes Verfahren zur Herstellung von lithografischen Druckplatten :
    a) Anfertigung eines wärmeempfindlichen Bilderzeugungselements, das auf einem lithografischen Träger mit einer hydrophilen Oberfläche eine erste Schicht mit einem in einer wäßrigalkalischen Lösung löslichen Polymer und auf der gleichen Seite des lithografischen Trägers wie die erste Schicht eine Deckschicht enthält, die gegenüber IR-Strahlung empfindlich ist und nicht durch einen alkalischen, SiO2 als Silikat enthaltenden Entwickler durchdringbar ist,
    b) bildmäßige Belichtung des wärmeempfindlichen Bilderzeugungselements mit IR-Strahlung, und
    c) Entwicklung des bildmäßig belichteten wärmeempfindlichen Bilderzeugungselements mit dem alkalischen Entwickler, so daß die belichteten Bereiche der Deckschicht und die unterliegenden Bereiche der ersten Schicht gelöst werden und die unbelichteten Bereiche der ersten Schicht ungelöst bleiben, dadurch gekennzeichnet, daß die Deckschicht einen IRabsorbierenden Cyaninfarbstoff enthält.
  2. Verfahren zur Herstellung von lithografischen Druckplatten nach Anspruch 1, dadurch gekennzeichnet, daß der IR-absorbierende Cyaninfarbstoff zwei Säuregruppen enthält.
  3. Verfahren zur Herstellung von lithografischen Druckplatten nach Anspruch 2, dadurch gekennzeichnet, daß der IR-absorbierende Cyaninfarbstoff zwei Indoleningruppen enthält.
  4. Verfahren zur Herstellung von lithografischen Druckplatten nach Anspruch 3, dadurch gekennzeichnet, daß der IR-absorbierende Cyaninfarbstoff Verbindung I der nachstehenden Struktur ist :
    Figure imgb0003
  5. Verfahren zur Herstellung von lithografischen Druckplatten nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Polymer in der Deckschicht ein wasserlösliches Polymer ist.
  6. Verfahren zur Herstellung von lithografischen Druckplatten nach Anspruch 5, dadurch gekennzeichnet, daß das Polymer Säuregruppen enthält.
  7. Verfahren zur Herstellung von lithografischen Druckplatten nach Anspruch 6, dadurch gekennzeichnet, daß das Polymer eine Verbindung aus der Gruppe bestehend aus Polymethacrylsäure und Polyacrylsäure ist.
  8. Verfahren zur Herstellung von lithografischen Druckplatten nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß der alkalische Entwickler SiO2 und M2O in einem Molverhältnis zwischen 0,5 und 1,5 und einem SiO2-Gewichtsverhältnis zwischen 0,5 und 5 Gew.-% enthält.
  9. Verfahren zur Herstellung von lithografischen Druckplatten nach Anspruch 8, dadurch gekennzeichnet, daß das bildmäßig belichtete wärmeempfindliche Bilderzeugungselement mit einem alkalischen Entwickler, der SiO2 und M2O in einem Molverhältnis zwischen 0,7 und 1,3 enthält, entwickelt wird.
  10. Verfahren zur Herstellung von lithografischen Druckplatten nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß das bildmäßig belichtete wärmeempfindliche Bilderzeugungselement mit einem alkalischen Entwickler, der SiO2 in einem Gewichtsverhältnis zwischen 1 und 4 Gew.-% enthält, entwickelt wird.
  11. Verfahren zur Herstellung von lithografischen Druckplatten nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß das Bindemittel der ersten Schicht Novolak ist.
EP98203120A 1997-10-08 1998-09-16 Verfahren zur Herstellung einer positiv arbeitenden Druckplatte aus wärmeempflindlichem Bildaufzeichnungsmaterial Expired - Lifetime EP0908305B2 (de)

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