EP0882583B1 - Wärmempfindliches Aufzeichnungselement und Verfahren zur Herstellung einer lithographischen Druckform damit - Google Patents

Wärmempfindliches Aufzeichnungselement und Verfahren zur Herstellung einer lithographischen Druckform damit Download PDF

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Publication number
EP0882583B1
EP0882583B1 EP19980201651 EP98201651A EP0882583B1 EP 0882583 B1 EP0882583 B1 EP 0882583B1 EP 19980201651 EP19980201651 EP 19980201651 EP 98201651 A EP98201651 A EP 98201651A EP 0882583 B1 EP0882583 B1 EP 0882583B1
Authority
EP
European Patent Office
Prior art keywords
ink
layer
heat sensitive
image
abhesive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19980201651
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English (en)
French (fr)
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EP0882583A1 (de
Inventor
Ludo Van Rompuy
Peter Ceyssens
Luc Leenders
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agfa Gevaert NV
Original Assignee
Agfa Gevaert NV
Agfa Gevaert AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Agfa Gevaert NV, Agfa Gevaert AG filed Critical Agfa Gevaert NV
Priority to EP19980201651 priority Critical patent/EP0882583B1/de
Publication of EP0882583A1 publication Critical patent/EP0882583A1/de
Application granted granted Critical
Publication of EP0882583B1 publication Critical patent/EP0882583B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41C1/1041—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by modification of the lithographic properties without removal or addition of material, e.g. by the mere generation of a lithographic pattern

Definitions

  • the present invention relates to a method for making a heat sensitive recording material for making a lithographic printing plate precursor for use in lithographic printing without dampening.
  • Lithographic printing is the process of printing from specially prepared surfaces, some areas of which are capable of accepting ink (oleophilic areas) whereas other areas will not accept ink (oleophobic areas).
  • the oleophilic areas form the printing areas while the oleophobic areas form the background areas.
  • lithographic printing plates Two basic types of lithographic printing plates are known. According to a first type, so called wet offset printing plates, both water or an aqueous dampening liquid and ink are applied to the plate surface that contains hydrophilic and hydrophobic areas. The hydrophilic areas will'be soaked with water or the dampening liquid and are thereby rendered oleophobic while the hydrophobic areas will accept the ink.
  • a second type of lithographic offset printing plates operates without the use of a dampening liquid and are called driographic printing plates. This type of printing plates comprises highly ink repellant areas and oleophilic areas. Generally the highly ink repellant areas consist of a silicone layer.
  • Driographic printing plates can be prepared using a photographic material that is made image-wise receptive or repellant to ink upon photo-exposure of the photographic material.
  • heat sensitive recording materials the surface of which can be made image-wise receptive or repellant to ink upon image-wise exposure to heat and/or subsequent development are also known for preparing driographic printing plates.
  • a heat sensitive recording material that comprises on a support carrying or having an oleophilic surface (i) a heat sensitive recording layer containing a self oxidizing binder e.g. nitrocellulose and a substance that is capable of converting radiation into heat e.g. carbon black and (ii) a non-hardened silicone layer as a surface layer.
  • the disclosed heat sensitive recording material is image-wise exposed using a laser and is subsequently developed using a developing liquid that is capable of dissolving the silicone layer in the exposed areas. Subsequent to this development the silicone surface layer is cured. Due to the use of naphta as a developing liquid the process is ecologically disadvantageous. Further since the surface layer is not hardened the heat sensitive recording material may be easily damaged during handling.
  • FR-A-1.473.751 discloses a heat sensitive recording material comprising a substrate having an oleophilic surface, a layer containing nitrocellulose and carbon black and a silicone layer. After image-wise exposure using a laser the imaged areas are said to be rendered oleophilic. The silicone layer decomposed on the exposed areas is removed on press. Ink acceptance of the obtained plates is poor and the printing properties such as printing endurance and resolution of the copies is rather poor.
  • Research Disclosure 19201 of april 1980 discloses a heat sensitive recording material comprising a polyester film support provided with a bismuth layer as a heat sensitive recording layer and a silicon layer on top thereof.
  • the disclosed heat sensitive recording material is imaged using an Argon laser and developed using hexane.
  • EP-A-573091 discloses a method for making a lithographic printing plate requiring a heat sensitive recording material comprising on a support having an oleophilic surface (i) a recording layer having a thickness of not more than 3 ⁇ m and containing a substance capable of converting the laser beam radiation into heat and (ii) a cured oleophobic surface layer and wherein said recording layer and oleophobic surface layer may be the same layer.
  • the exposed material is processed by a rub-off step.
  • GB-1 387 542 discloses the preparation of an electrophotographic toner image on a silicone layer.
  • the toner image is thermally fused.
  • the ink accepting phase is a continuous phase.
  • JP 63-22687 discloses a lithographic printing plate wherein on a support is coated a dispersion layer which contains particles comprising a thermoplastic resin containing fluorine and a binder resin, and a tetrafluoroethylene resin and a polymer of fluorine-containing acrylic acid are adapted to the particles of the thermoplastic resin containing fluorine. It is not disclosed that said binder is ink accepting.
  • US-P 4 010 687 discloses a printing master and a a method for producing the same which comprises: coating a suitable substrate with a layer of an ink releasable material selected from the group consisting of silicone elastomers and heterophase polymeric compositions. It is not mentioned that the non-silicone phase is a continuous phase.
  • US-P 4 686 138 discloses a printing plate for offset printing which comprises a water resistant support and an image receiving layer provided thereon which comprises an inorganic pigment and a mixed binder comprising a water-soluble high polymer compound and a synthetic high polymer latex. It is not mentioned that an inkabhesive phase is present.
  • WO 97/175 discloses a printing plate including a substrate, an IR absorbing layer comprised substantially of a first water based emulsion and a top IR ablatable layer comprised substantially of a second water based emulsion. It is not disclosed that said top layer consist of two phases.
  • EP-A 755 803 discloses a lithographic printing plate comprising the non-image area of a hydrophilic swellable layer ; being 1 to 50 mg/m 2 in water absorbability, and the water absorbability of the image area, being less than that of the non-image area. It is not disclosed that said plate comprises an ink abhesive phase.
  • US-P 4 012 254 discloses a process for preparing a nonimage photoconductive waterless lithographic printing master comprising providing a heterogenous copolymer containing an abhesive species of polysiloxane groups and an imaging material adhesive species of organic thermoplastic groups, providing a solvent which will preferentially dissolve one of said species, placing said copolymer in said solvent wherein the non-soluble species forms micelles, providing a photoconductive pigment and dispersing said pigment in the resultant solution, providing a suitable master substrate and coating the resultant suspension on said master substrate, and allowing the solvent to evaporate whereby the soluble species forms the matrix in which the pigment is dispersed. It does not disclose the presence of a ink accepting homogeneous phase.
  • XP02019315 discloses a repellant composition for making driographic printing plates comprising a polysiloxane oil, a solid fluorinated polymer and a hydrophobic polymeric binder.
  • the described composition is solvent coatable.
  • a method for making a lithographic printing plate precursor comprising the steps of:
  • a hydrophilic polymer means that water will adhere to said polymer when coated on a support and brought in contact with a mixture of water and oil.
  • a layer of such a hydrophilic polymer can adhere to oil when brought in contact with a waterless oily solution.
  • an oleophilic polymer means that oil will adhere to the polymer when coated on a support and brought in contact with a mixture of water and oil.
  • the ink accepting polymer comprises a latex of an oleophilic polymer.
  • oleophilic polymer latices for use in connection with the present embodiment of the invention are preferably polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polyvinyl carbazole etc., copolymers or mixtures thereof. Most preferably used are polystyrene, polymethyl-methacrylate or copolymers thereof Said polymer latex may be hardened.
  • the ink abhesive polymer comprises also an ink abhesive latex of a silicone based polymer.
  • the ratio between the amount of ink abhesive latex and oleophilic binder lies in the range between 1:10 to 10:1, more preferably in the range between 1:5 to 5:1, most preferably in the range between 1:2 to 2:1.
  • This embodiment has the advantage that it can be coated from an aqueous dispersion.
  • the thickness of the recording layer ranges preferably from 0.2 to 25 ⁇ m, more preferably from 1 to 10 ⁇ m.
  • the weight average molecular weight of the ink accepting or ink abhesive polymers may range from 5,000 to 1,000,000g/mol.
  • the polymer latices may have a particle size from 0.01 ⁇ m to 50 ⁇ m, more preferably between 0.05 ⁇ m and 10 ⁇ m and most preferably between 0.05 ⁇ m and 2 ⁇ m.
  • the heat sensitive recording material preferably includes a compound capable of converting light to heat.
  • the compound capable of converting light into heat can be present in a layer contiguous to the recording layer but is preferably present in the recording layer.
  • Suitable compounds capable of converting light into heat are more preferably infrared absorbing components although the wavelength of absorption is not of particular importance as long as the absorption of the compound used is in the wavelength range of the light source used for image-wise exposure.
  • Particularly useful compounds are for example dyes and in particular infrared dyes, carbon black, metal carbides, borides, nitrides, carbonitrides, bronze-structured oxides and oxides structurally related to the bronze family but lacking the A component e.g. WO 2.9 .
  • conductive polymer dispersions such as polypyrrole or polyaniline-based conductive polymer dispersions. It has been found that carbon black yields very good and favorable results.
  • the support of the heat sensitive recording material may be any support which is suitable for lithographic printing materials.
  • Said support can be a layer having a hydrophilic or a hydrophobic surface such as a polymeric, a metallic or a glass layer.
  • the lithographic base has a hydrophilic surface which favourably influences the adhesion of aqueous coated layers.
  • a particularly preferred lithographic base having a hydrophilic surface is an electrochemically grained and anodised aluminum support.
  • an 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 or can 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. Still further, 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 hydrophobic supports may be opaque or transparent, e.g. a paper support or a resin support.
  • a paper support preference is given to one coated at one or both sides with an alpha-olefin polymer, e.g. a polyethylene layer which optionally contains an anti-halation dye or pigment.
  • an organic resin support is used e.g. cellulose esters such as cellulose acetate, cellulose propionate and cellulose butyrate; polyesters such as poly(ethylene terephthalate); polyvinyl acetals, polystyrene, polycarbonate; polyvinylchloride or poly-Alpha-olefins such as polyethylene or polypropylene.
  • One or more subbing layers may be coated between the support and the recording layer for use in accordance with the present invention in order to get an improved adhesion between these two layers.
  • the heat sensitive element according to the invention is image-wise heated or exposed to actinic light and is then used as a printing plate without further development.
  • Heat is preferably applied by a thermal printer
  • Actinic light is light that is absorbed by the compound converting light into heat.
  • Image-wise exposure in connection with the present invention is preferably an image-wise scanning exposure involving the use of a laser or L.E.D.. It is highly preferred in connection with the present invention to use a laser emitting in the infrared (IR) and/or near-infrared, i.e. emitting in the wavelength range 700-1500nm. Particularly preferred for use in connection with the present invention are laser diodes emitting in the near-infrared.
  • IR infrared
  • near-infrared i.e. emitting in the wavelength range 700-1500nm.
  • laser diodes emitting in the near-infrared are particularly preferred for use in connection with the present invention.
  • the exposed areas become ink abhesive while the unexposed areas remain ink accepting or the exposed areas become ink accepting while the unexposed areas remain ink abhesive.
  • An aqueous dispersion is prepared by mixing 2.5 g of a 20% polystyrene dispersion with 4.0 g of a 50% silicone emulsion (Dehesive 410 E from Wacker-Chemie GmbH, Germany), 0.81 g of a 37% of a methyl hydrogen siloxane crosslinking agent (V 72 from Wacker-Chemie GmbH, Germany) and 0.12 g of an infrared absorbing dye with the following formula:
  • the dispersion is made up with water to a total volume of 20 ml and well mixed.
  • the dispersion is coated with a coating knife on a PET polyester support at a wet thickness of 20 ⁇ m and dried at a temperature of 60°C during 10 minutes.
  • An image is formed with an external drum diode laser (830 nm) with an output level of 305 mW and a drumspeed of 8 m/s.
  • the negative image material is used as a waterless printing plate on an AB DICK 9860 printing press using a Hostman-Steinberg Reflecta Dry ink (magenta). Up to 100 copies of the image were satisfactorily printed.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Claims (5)

  1. Ein durch die nachstehenden Schritte gekennzeichnetes Verfahren zur Herstellung eines wärmeempfindlichen lithografischen Druckplattenvorläufers :
    Anfertigung einer wäßrigen Lösung, die einen farbanziehenden Polymerlatex und einen farbabstoßenden Silikonlatex in einem Verhältnis zwischen 1:10 und 10:1 enthält,
    Auftrag der wäßrigen Lösung auf einen Träger, wobei eine Bildaufzeichnungsschicht erhalten wird.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der farbanziehende Polymerlatex aus der Gruppe bestehend aus Polystyrol, Polymethylmethacrylat, Polyvinylchlorid, Polyvinylidenchlorid, Polyacrylnitril, Polyvinylcarbazol und Copolymeren oder Gemischen derselben gewählt wird.
  3. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der farbanziehende Polymerlatex und der farbabstoßende Silikonlatex in einem Verhältnis zwischen 1:5 und 5:1 enthalten sind.
  4. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß der farbanziehende Polymerlatex und der farbabstoßende Silikonlatex in einem Verhältnis zwischen 1:2 und 2:1 enthalten sind.
  5. Verfahren zur Herstellung einer driografischen Druckplatte, wobei ein nach dem Verfahren von Anspruch 1 bis 4 hergestellter Druckplattenvorläufer bildmäßig mit Wärme beaufschlagt oder IR-Licht belichtet wird, wobei ein aus farbanziehenden und farbabstoßenden Bereichen zusammengesetztes Bild erhalten wird.
EP19980201651 1997-06-05 1998-05-15 Wärmempfindliches Aufzeichnungselement und Verfahren zur Herstellung einer lithographischen Druckform damit Expired - Lifetime EP0882583B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19980201651 EP0882583B1 (de) 1997-06-05 1998-05-15 Wärmempfindliches Aufzeichnungselement und Verfahren zur Herstellung einer lithographischen Druckform damit

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP97201682 1997-06-05
EP97201682 1997-06-05
EP19980201651 EP0882583B1 (de) 1997-06-05 1998-05-15 Wärmempfindliches Aufzeichnungselement und Verfahren zur Herstellung einer lithographischen Druckform damit

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EP0882583A1 EP0882583A1 (de) 1998-12-09
EP0882583B1 true EP0882583B1 (de) 2002-06-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7380500B2 (en) 2002-10-31 2008-06-03 Agfa-Gevaert Process for the offset printing of patterns via the fountain medium

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3713920B2 (ja) 1997-09-22 2005-11-09 コニカミノルタホールディングス株式会社 感熱性平版印刷版材料及びその製造方法、並びに、画像形成方法
EP0922572A1 (de) * 1997-12-09 1999-06-16 Agfa-Gevaert N.V. Wärmeempfindliches Aufzeichnungselement, sowie Verfahren zur Herstellung von lithographischen Druckplatten
EP1415826B1 (de) 2002-10-31 2008-10-01 Agfa-Gevaert Verfahren zum Bedrucken von Mustern mit Offsetdruck durch das Feuchtwasser

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL114137A (en) * 1995-06-13 1998-12-06 Scitex Corp Ltd Infrared radiation-sensitive printing plates and methods for their preparation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7380500B2 (en) 2002-10-31 2008-06-03 Agfa-Gevaert Process for the offset printing of patterns via the fountain medium

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