EP0774364B1 - Procédé pour la fabrication d'une plaque lithographique par échauffement selon une image d'un élément pour l'enregistrement de l'image avec une tête thermique - Google Patents

Procédé pour la fabrication d'une plaque lithographique par échauffement selon une image d'un élément pour l'enregistrement de l'image avec une tête thermique Download PDF

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Publication number
EP0774364B1
EP0774364B1 EP19950203129 EP95203129A EP0774364B1 EP 0774364 B1 EP0774364 B1 EP 0774364B1 EP 19950203129 EP19950203129 EP 19950203129 EP 95203129 A EP95203129 A EP 95203129A EP 0774364 B1 EP0774364 B1 EP 0774364B1
Authority
EP
European Patent Office
Prior art keywords
imaging element
meth
image
polymer particles
hydrophilic binder
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
EP19950203129
Other languages
German (de)
English (en)
Other versions
EP0774364A1 (fr
Inventor
Joan Vermeersch
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
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Agfa Gevaert NV
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 filed Critical Agfa Gevaert NV
Priority to DE1995619100 priority Critical patent/DE69519100T2/de
Priority to EP19950203129 priority patent/EP0774364B1/fr
Priority to US08/747,667 priority patent/US5816162A/en
Priority to JP31875896A priority patent/JP2938400B2/ja
Publication of EP0774364A1 publication Critical patent/EP0774364A1/fr
Application granted granted Critical
Publication of EP0774364B1 publication Critical patent/EP0774364B1/fr
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
    • B41C1/1008—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
    • B41C1/1025—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 using materials comprising a polymeric matrix containing a polymeric particulate material, e.g. hydrophobic heat coalescing particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/36—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using a polymeric layer, which may be particulate and which is deformed or structurally changed with modification of its' properties, e.g. of its' optical hydrophobic-hydrophilic, solubility or permeability properties
    • B41M5/366—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using a polymeric layer, which may be particulate and which is deformed or structurally changed with modification of its' properties, e.g. of its' optical hydrophobic-hydrophilic, solubility or permeability properties using materials comprising a polymeric matrix containing a polymeric particulate material, e.g. hydrophobic heat coalescing particles
    • 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
    • B41C2210/22—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

Definitions

  • the present invention relates to a method for making a lithographic printing plate involving image-wise heating of an imaging element by means of a thermal head.
  • 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.
  • Lithocraft 10008 FOTOPLATETM is a diazo based printing plate that comprises on a paper support a hydrophilic layer on top of which is provided a diazo based photosensitive layer.
  • a plate can be prepared by image-wise exposure of the lithographic printing plate precursor or imaging element, mounting the exposed imaging element on the press and wiping its surface with Lithocraft® 10008 Developer Desensitizer.
  • the plate instructions also contemplate a method wherein no developer desensitizer is used. However, such method most often results in poor lithographic preformance so that in practice a Developer Desensitizer is almost always needed.
  • the present invention relates to method for making a lithographic printing plate comprising the steps of:
  • An imaging element for use in accordance with the present invention comprises on a hydrophilic surface of a lithographic base an image forming layer comprising hydrophobic thermoplastic polymer particles dispersed in a hydrophilic binder and further a diazonium salt, diazo resin or aryldiazosulphonate resin.
  • the hydrophilic binder of the image forming layer used in connection with the present invention is preferably not cross-linked or only slightly cross-linked.
  • the lithographic base comprises a flexible support, such as e.g. paper or plastic film, provided with an ink-repellant layer comprising a cross-linked hydrophilic binder.
  • a particularly suitable ink-repellant layer may be obtained from a hydrophilic binder cross-linked with a cross-linking agent such as formaldehyde, glyoxal, polyisocyanate or a hydrolysed tetra-alkylorthosilicate. 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, preferably between 0.5 and 5 parts by weight, more preferably between 1.0 parts by weight and 3 parts by weight.
  • An ink-repellant 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.
  • the thickness of an ink-repellant 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.
  • ink-repellant layers for use in accordance with the present invention are disclosed in EP-A 601240, GB-P-1419512, FR-P-2300354, US-P-3971660, US-P-4284705 and EP-A 514490.
  • plastic film e.g. substrated polyethylene terephthalate film, polyethylene naphthalate 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 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 a surface area of 500 m 2 per gram.
  • an image forming layer on top of a hydrophilic surface of the lithographic base there is provided an image forming layer.
  • an image forming layer in connection with the present invention comprises hydrophobic thermoplastic polymer particles dispersed in a hydrophilic binder and further a diazonium salt, diazo resin or aryldiazosulphonate resin.
  • Suitable hydrophilic binders for use in an image forming layer in connection with this invention are for example synthetic homo or copolymers such as a polyvinylalcohol, a poly(meth)acrylic acid, a poly(meth)acrylamide, a polyhydroxyethyl(meth)acrylate, a polyvinylmethylether or natural binders such as gelatin, a polysacharide such as e.g. dextran, pullulan, cellulose, arabic gum, alginic acid.
  • Hydrophobic thermoplastic polymer particles used in connection with the present invention preferably have a coagulation temperature above 35°C and more preferably above 50°C. Coagulation may result from softening or melting of the thermoplastic polymer particles under the influence of heat. There is no specific upper limit to the coagulation temperature of the thermoplastic hydrophobic polymer particles, however the temperature should be sufficiently below the decomposition of the polymer particles. Preferably the coagulation temperature is at least 10°C below the temperature at which the decomposition of the polymer particles occurs.
  • said polymer particles When said polymer particles are subjected to a temperature above coagulation temperature they coagulate to form a hydrophobic agglomerate in the hydrophilic layer so that at these parts the hydrophilic layer becomes insoluble in plain water or an aqueous liquid.
  • hydrophobic thermoplastic polymer particles for use in connection with the present invention are e.g. polyethylene, polyvinyl chloride, polymethyl (meth)acrylate, polyethyl (meth)acrylate, polyvinylidene chloride, polystyrene polyacrylonitrile, polyvinyl carbazole etc. or copolymers thereof. Most preferably used is polymethyl (meth)acrylate or polystyrene.
  • the weight average molecular weight of the polymers may range from 5,000 to 1,000,000g/mol.
  • the hydrophobic particles 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 polymer particles are present as a dispersion in the aqueous coating liquid of the image forming layer and may be prepared by the methods disclosed in US-P-3.476.937. Another method especially suitable for preparing an aqueous dispersion of the thermoplastic polymer particles comprises:
  • the amount of hydrophobic thermoplastic polymer particles contained in the image forming layer is preferably more than 30% by weight, more preferably at least 50% by weight and most preferably at least 65% by weight.
  • diazo resins useful in the present invention include condensation products of an aromatic diazonium salt as the light-sensitive substance.
  • condensation products are known and are described, for example, in German Pat. no. 1214086. They are in general prepared by condensation of a polynuclear aromatic diazonium compound, preferably of substituted or unsubstituted diphenylamine-4-diazonium salts, with active carbonyl compounds, preferably formaldehyde, in a strongly acid medium.
  • the obtained dispersion was coated on a polyethyleneterephthalate film support (coated with a hydrophilic adhesion layer) to a wet coating thickness of 50 g/m 2 , dried at 30 °C, and subsequently hardened by subjecting it to a temperature of 57 °C for 1 week.
  • the obtained element was then heated for 1 week at 57 °C.
  • An imaging element was produced by preparing the following coating composition and coating it to the above described lithographic base in an amount of 35g/m 2 (wet coating amount) and drying it at 30°C.
  • An imaging element as described above was image-wise heated in a DRYSTARTM MATRIXTM DI2000 thermal printer (commercially available from Agfa-Gevaert NV) and hereafter the non-heated parts were washed-off manually as follows:
  • This printing plate was then mounted on an AB Dick 360TM offsetpress equipped with a VARNTM KOMPAC II dampening system.
  • VARNTM KOMPAC II dampening system As ink, Van Son RB2329TM and as a dampening liquid G671cTM (Agfa-Gevaert NV) was used. Good prints were obtained during printing without ink uptake in the non-image areas.
  • An imaging element was prepared as described in example 1 and image-wise heated as in example 1. Subsequently, the image-wise heated imaging element was mounted on the offset press mentioned in example 1. The same ink and dampening liquid were used as in example 1.
  • the printing press was started and dampening liquid was supplied to the imaging elements surface by dropping the dampener rollers of the printing press. After 5 revolutions the ink rollers were dropped as well and after a further 5 revolutions, a good printing quality was obtained without any ink uptake in the non-image areas.

Claims (6)

  1. Un procédé pour faire une plaque d'impression lithographique comprenant les phases consistant à:
    (1) échauffer en forme d'image au moyen d'une tête thermique un élément formateur d'image comprenant sur un support flexible (i) une couche repoussant l'encre qui contient un liant hydrophile réticulé et (ii) une couche formatrice d'image comprenant des particules polymères thermoplastiques hydrophobes qui sont dispersées dans un liant hydrophile, et en plus un sel de diazonium, une résine diazo ou une résine de diazosulfonate d'aryle;
    (2) développer un élément formateur d'image échauffé en forme d'image - que l'on a obtenu de cette façon - avec de l'eau ou un liquide aqueux;
    (3) exposer intégralement à la lumière UV un élément formateur d'image développé que l'on a obtenu de cette façon.
  2. Un procédé selon la revendication 1, caractérisé en ce que le support flexible est un film plastique.
  3. Un procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les particules polymères thermoplastiques hydrophobes ont une température de coagulation d'au moins 35 °C.
  4. Un procédé selon la revendication 3, caractérisé en ce que les particules polymères thermoplastiques hydrophobes sont choisies dans le groupe constitué par le poly(éthylène), le poly(styrène), le poly((méth)acrylate de méthyle), le poly(chlorure de vinyle), le poly((méth)acrylate d'éthyle), le poly(chlorure de vinylidène), le poly(acrylonitrile) et le poly(vinylcarbazole).
  5. Un procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le liant hydrophile dans la couche formatrice d'image est choisi dans le groupe constitué par un poly(alcool de vinyle), un acide poly(méth)acrylique, un poly((méth)acrylamide), un poly((méth)acrylate d'hydroxyéthyle), un poly(éther de vinyle et de méthyle), un poly(saccharide).
  6. Un procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le liant hydrophile dans la couche repoussant l'encre est un poly(alcool de vinyle) qui est réticulé au moyen d'un orthosilicate de tétraalkyle hydrolysé.
EP19950203129 1995-11-16 1995-11-16 Procédé pour la fabrication d'une plaque lithographique par échauffement selon une image d'un élément pour l'enregistrement de l'image avec une tête thermique Expired - Lifetime EP0774364B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE1995619100 DE69519100T2 (de) 1995-11-16 1995-11-16 Verfahren zur Herstellung einer Flachdruckplatte durch bildmässige Erwärmung eines Bildaufnahmeelements mittels eines Thermodruckkopfes
EP19950203129 EP0774364B1 (fr) 1995-11-16 1995-11-16 Procédé pour la fabrication d'une plaque lithographique par échauffement selon une image d'un élément pour l'enregistrement de l'image avec une tête thermique
US08/747,667 US5816162A (en) 1995-11-16 1996-11-12 Method for making a lithographic printing plate by image-wise heating an imaging element using a thermal head
JP31875896A JP2938400B2 (ja) 1995-11-16 1996-11-14 サーマルヘツドを用いた画像形成要素の画像通りの加熱による平版印刷版の作製法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19950203129 EP0774364B1 (fr) 1995-11-16 1995-11-16 Procédé pour la fabrication d'une plaque lithographique par échauffement selon une image d'un élément pour l'enregistrement de l'image avec une tête thermique

Publications (2)

Publication Number Publication Date
EP0774364A1 EP0774364A1 (fr) 1997-05-21
EP0774364B1 true EP0774364B1 (fr) 2000-10-11

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EP19950203129 Expired - Lifetime EP0774364B1 (fr) 1995-11-16 1995-11-16 Procédé pour la fabrication d'une plaque lithographique par échauffement selon une image d'un élément pour l'enregistrement de l'image avec une tête thermique

Country Status (3)

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EP (1) EP0774364B1 (fr)
JP (1) JP2938400B2 (fr)
DE (1) DE69519100T2 (fr)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3843584B2 (ja) 1998-03-20 2006-11-08 大日本インキ化学工業株式会社 感熱性組成物およびそれを用いた平版印刷版原版および印刷刷版作製方法
EP0963841B1 (fr) * 1998-06-12 2003-05-28 Agfa-Gevaert Méthode de fabrication de plaques d'impression travaillant en positif à partir d'un latex
US6124425A (en) 1999-03-18 2000-09-26 American Dye Source, Inc. Thermally reactive near infrared absorption polymer coatings, method of preparing and methods of use
JP4588182B2 (ja) * 2000-08-31 2010-11-24 株式会社きもと 平版印刷用刷版および平版印刷用刷版の製造方法
US6815139B2 (en) 2000-12-07 2004-11-09 Agfa-Gevaert Method of processing a printing plate material with a single-fluid ink
EP1232858B1 (fr) 2001-02-16 2003-10-15 Agfa-Gevaert Revêtement et développement sur presse d'une plaque lithographique
US6789481B2 (en) 2001-02-16 2004-09-14 Agfa-Gevaert On-press coating and on-press processing of a lithographic material
US6789480B2 (en) 2001-02-16 2004-09-14 Agfa-Gevaert On-press exposure and on-press processing of a lithographic material
EP1232859B1 (fr) 2001-02-16 2003-11-26 Agfa-Gevaert Revêtement et développement sur presse d'une plaque lithographique
EP1243433B1 (fr) 2001-03-22 2004-05-26 Agfa-Gevaert Méthode d'impression lithographique utilisant une encre comprenant un fluide unique
EP1321309A2 (fr) 2001-12-21 2003-06-25 Agfa-Gevaert Procédé de fabrication d'une plaque d'impression lithographique
EP1884372B1 (fr) 2006-08-03 2009-10-21 Agfa Graphics N.V. Support pour plaque d'impression lithographique
ATE468981T1 (de) 2007-11-30 2010-06-15 Agfa Graphics Nv Verfahren zur behandlung einer lithografiedruckplatte
ES2430562T3 (es) 2008-03-04 2013-11-21 Agfa Graphics N.V. Método para la fabricación de un soporte de una plancha de impresión litográfica
ATE514561T1 (de) 2008-03-31 2011-07-15 Agfa Graphics Nv Verfahren zur behandlung einer lithografischen druckplatte
US8221960B2 (en) 2009-06-03 2012-07-17 Eastman Kodak Company On-press development of imaged elements
EP3032334B1 (fr) 2014-12-08 2017-10-18 Agfa Graphics Nv Système permettant de réduire les débris d'ablation
WO2017157574A1 (fr) 2016-03-16 2017-09-21 Agfa Graphics Nv Procédé et appareil de traitement d'une plaque d'impression lithographique
EP3637188A1 (fr) 2018-10-08 2020-04-15 Agfa Nv Précurseur de révélateur effervescent pour le traitement d'un précurseur de plaque d'impression lithographique

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Publication number Priority date Publication date Assignee Title
FR1424008A (fr) * 1963-12-05 1966-01-07 Gevaert Photo Prod Nv Procédé d'enregistrement d'informations au moyen d'un matériel sensible à la chaleur et à la pression
GB1208414A (en) * 1966-10-24 1970-10-14 Agfa Gevaert Nv Improvements relating to thermo recording
JPS5935797B2 (ja) * 1980-12-17 1984-08-30 コニカ株式会社 感熱記録材料
US4965322A (en) * 1987-04-06 1990-10-23 Asahi Kasei Kogyo Kabushiki Kaisha Photosensitive and heat-sensitive polymers, process for producing the same and process for recording information using the same
JP2955636B2 (ja) * 1990-05-31 1999-10-04 株式会社リコー 感熱型平版印刷用原版

Also Published As

Publication number Publication date
JPH09141819A (ja) 1997-06-03
DE69519100D1 (de) 2000-11-16
DE69519100T2 (de) 2001-05-10
JP2938400B2 (ja) 1999-08-23
EP0774364A1 (fr) 1997-05-21

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