EP1208973B1 - Plaque d'impression lithographique sans traitement - Google Patents

Plaque d'impression lithographique sans traitement Download PDF

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Publication number
EP1208973B1
EP1208973B1 EP20000204092 EP00204092A EP1208973B1 EP 1208973 B1 EP1208973 B1 EP 1208973B1 EP 20000204092 EP20000204092 EP 20000204092 EP 00204092 A EP00204092 A EP 00204092A EP 1208973 B1 EP1208973 B1 EP 1208973B1
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EP
European Patent Office
Prior art keywords
hydrophilic
material according
layer
oleophilic
cross
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
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EP20000204092
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German (de)
English (en)
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EP1208973A1 (fr
Inventor
Marc C/O Agfa-Gevaert N.V. Van Damme
Wim c/o AGFA-GEVAERT Corporate IP Departm. Sap
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Agfa Gevaert NV
Agfa Gevaert AG
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Agfa Gevaert NV
Agfa Gevaert AG
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Priority to DE2000610283 priority Critical patent/DE60010283T2/de
Priority to EP20000204092 priority patent/EP1208973B1/fr
Priority to US09/993,073 priority patent/US6620573B2/en
Priority to JP2001353251A priority patent/JP2002200854A/ja
Publication of EP1208973A1 publication Critical patent/EP1208973A1/fr
Application granted granted Critical
Publication of EP1208973B1 publication Critical patent/EP1208973B1/fr
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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
    • B41C1/1033—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 by laser or spark ablation

Definitions

  • the present invention relates to a negative-working heat-sensitive material which is suitable for making a lithographic printing plate by direct-to-plate recording and to a method for imaging said heat-mode recording material by means of an infrared laser.
  • Lithographic printing is the process of printing from specially prepared surfaces, which contain a lithographic image consisting of areas that are capable of accepting ink (oleophilic areas) and areas that do not accept ink but are water-accepting (hydrophilic areas).
  • a lithographic image consisting of areas that are capable of accepting ink (oleophilic areas) and areas that do not accept ink but are water-accepting (hydrophilic areas).
  • wet lithographic printing methods both water or an aqueous dampening liquid (also called fountain solution) and ink are applied to the plate surface that contains the hydrophilic and oleophilic areas.
  • the hydrophilic areas are soaked with water or the dampening liquid and are thereby rendered oleophobic.
  • heat-mode plate materials which can be used as a lithographic master for printing with greasy inks.
  • Ablative plates are the best known examples of so-called processless plates, i.e. plates which do not require any processing and therefore can be used as a printing plate immediately after exposure.
  • the heat which is generated in the recording layer of such ablative plates by light absorption of a laser beam, removes a hydrophilic or oleophilic topcoat to expose an underlying oleophilic respectively hydrophilic surface, thereby obtaining the necessary differentiation of ink-acceptance between the image (printing) and non-image or background (non-printing) areas.
  • DE-A-2 448 325 discloses a laser heat-mode 'direct negative' printing plate comprising e.g. a polyester film support provided with a hydrophilic surface layer.
  • the disclosed heat-mode recording material is imaged using an Argon laser thereby rendering the exposed areas oleophilic.
  • An offset printing plate is thus obtained which can be used on an printing press without further processing.
  • the plate is called a 'direct negative' plate because it is suitable for direct exposure by a laser beam ("computer-to-plate", no film mask required) and because the areas of the recording material that have been exposed to the laser are rendered ink-accepting and define the image areas, i.e. the printing areas.
  • DE-A-2 448 325 concern "direct negative" printing plates comprising e.g. hydrophilic aluminum support coated with a water soluble laser light (Argon-488nm) absorbing dye or with a coating based on a mixture of hydrophilic polymer and laser light absorbing dye (Argon-488nm).
  • heat-mode recording materials for preparing "direct negative” printing plates have been described in e.g. DE-A-2 607 207, DD-A-213 530, DD-A-217 645 and DD-A-217 914 . These documents disclose heat-mode recording materials that contain an anodized aluminum support and a hydrophilic recording layer provided thereon.
  • DD-A-155 407 discloses a processless heat-mode 'direct negative' printing plate where a hydrophilic aluminum oxide layer is rendered oleophilic by direct laser heat-mode imaging.
  • the above heat-mode 'direct negative' lithographic printing plate are characterized by a low recording speed and/or the obtained plates are of poor quality and durability.
  • EP-A-580 393 discloses an ablative lithographic printing plate directly imageable by laser discharge, the plate comprising a topmost first layer and a second layer underlying the first layer wherein the first layer is characterized by efficient absorption of infrared radiation and the first and second layer exhibit different affinities for at least one printing liquid.
  • EP-A-683 728 discloses a heat-mode recording material comprising on a support having an ink receptive surface or being coated with an ink receptive layer a substance capable of converting light into heat and a hardened hydrophilic surface layer having a thickness not more than 3 ⁇ m.
  • US 4,034,183 describes a processless lithographic plate that comprises a light-absorbing hydrophilic top layer coated on a support which is exposed to a laser beam to convert the absorber from an ink repelling to an ink receiving state. All of the examples and teachings require a high power laser, and the run lengths of the resulting lithographic plates are limited.
  • US 4,054,094 describes a process for making a lithographic printing plate by using a laser beam to etch away a thin top coating of polysilicic acid on a polyester base, thereby rendering the exposed areas receptive to ink. No details of run length or print quality are given, but it is expected that an non-crosslinked polymer such as polysilicic acid will wear off rapidly and give a short run length.
  • US 4,081,572 describes a method for preparing a printing master on a substrate by coating the substrate with a hydrophilic polyamic acid and then image-wise converting the polyamic acid to melanophilic polyimide with heat from a flash lamp or a laser. No details of run length, image quality or ink/water balance are given.
  • Japanese Kokai No. 55/105560 describes a method of preparation of a lithographic printing plate by laser beam removal of a hydrophilic layer coated on a melanophilic support, in which the hydrophilic layer contains colloidal silica, colloidal alumina, a carboxylic acid, or a salt of a carboxylic acid.
  • the hydrophilic layer contains colloidal silica, colloidal alumina, a carboxylic acid, or a salt of a carboxylic acid.
  • the only examples given use colloidal alumina alone, or zinc acetate alone, with no crosslinkers or addenda. No details are given for the ink/water balance or limiting run length.
  • WO 92/09934 describes and broadly claims any photosensitive composition containing a photo acid generator, and a polymer with acid labile tetrahydropyranyl groups. This would include a hydrophobic /hydrophilic switching lithographic plate composition. However, such a polymeric switch is known to give weak differentiation between hydrophilic and oleophilic areas.
  • Unpublished EP-A-1065050 discloses a negative-working heat-sensitive material for making lithographic plates comprising in the order given a lithographic base having a hydrophilic surface, an oleophilic imaging layer and a cross-linked hydrophilic upper layer.
  • the heat generated during exposure in the light-sensitive layer removes the hydrophilic upper layer by ablation.
  • the oleophilic imaging layer has a thin coating thickness that is optimized for achieving a high run length.
  • it was found that the run length of the image areas was still not satisfying, because of the effect of the hydrophilic support just below the thin oleophilic layer. This is especially the case when using long pixel dwell times as those for example on external drum laser recording equipment such as the Creo TrendSetter 3244 (drum rotating at 50 to 250 rpm).
  • the lithographic printing plate of the present invention comprises in the order given a lithographic base having a hydrophilic surface, an oleophilic imaging layer and a cross-linked hydrophilic upper layer. It has surprisingly been found that by the addition of even very small amounts of transition metal complexes of an organic acid in the oleophilic imaging layer , the run length of these plate increases substantially. Transition metals are generally defined as the elements of atomic numbers 21-31, 39-49 and 71-81. Chromium is highly preferred.
  • chromium complexes of organic acids are sold under the QUILON trade name by Dupont Corporation, such as QUILON C, a 25 to 30% by weight solution of the Werner complex of trivalent chromium and myristic or stearic acid in isopropyl alcohol, as described in Quilon chrome Complexes, Dupont Corporation, April, 1992.
  • the oleophilic imaging layer comprises a binder and a compound capable of converting light into heat.
  • Suitable compounds capable of converting light into heat are preferably infrared absorbing components having an absorption 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 as disclosed in EP-A- 908 307 and pigments and in particular infrared pigments such as carbon black, metal carbides, borides, nitrides, carbonitrides, and bronze-structured oxides.
  • conductive polymer dispersion such as polypyrrole, polyaniline, or polythiophene-based conductive polymer dispersions. Carbon black or graphite yield very good and favorable results.
  • the binder of the oleophilic imaging layer is preferably selected from the group consisting of polyvinyl chloride, polyesters, polyurethanes, novolac, polyvinyl carbazole, or copolymers or mixtures thereof.
  • the binder itself is heat-sensitive: e.g. a self-oxidizing polymer containing nitrate ester groups such as cellulose nitrate as disclosed in GB-P-1 316 398 and DE-A- 2 512 038 ; a polymer containing carbonate groups such as polyalkylene carbonate; or a polymer containing covalently bound chlorine such as polyvinylidene chloride.
  • substances containing azo or azide groups, capable of liberating N 2 upon heating are favorably used.
  • the dry coating weight of the oleophilic imaging layer is preferably between 0.10 and 0.75 g/m 2 , more preferably between 0.15 and 0.50 g/m 2 .
  • the cross-linked hydrophilic upper layer is preferably coated from aqueous compositions containing hydrophilic binders having free reactive groups including e.g. hydroxyl, carboxyl, hydroxyethyl, hydroxypropyl, amino, aminoethyl, aminopropyl, carboxymethyl, etc., along with suitable crosslinking or modifying agents including e.g. hydrophilic organotitanium reagents, aluminoformyl acetate, dimethylol urea, melamines, aldehydes, hydrolyzed tetraalkyl orthosilicate, etc.
  • hydrophilic organotitanium reagents e.g. hydrophilic organotitanium reagents, aluminoformyl acetate, dimethylol urea, melamines, aldehydes, hydrolyzed tetraalkyl orthosilicate, etc.
  • Suitable hydrophilic binders for use in the upper layer may be selected from the group consisting of gum arabic, casein, gelatin, starch derivatives, carboxymethyl cellulose and the salts thereof, cellulose acetate, sodium alginate, vinyl acetate-maleic acid copolymers, styrene-maleic acid copolymers, polyacrylic acids and salts thereof, polymethacrylic acids and salts thereof, hydroxyethylene polymers, polyethylene glycols, hydroxypropylene polymers, polyvinyl alcohols and hydrolyzed polyvinylacetate having a hydrolyzation degree of at least 60% by weight and more preferably at least 80% by weight.
  • Hydrophilic layers containing polyvinylalcohol or polyvinylacetate hydrolyzed to an extent of at least 60% by weight hardened with a tetraalkyl orthosilicate, e.g. tetraethyl orthosilicate or tetramethyl orthosilicate, as disclosed in e.g. US 3,476,937, are particularly preferred because their use in the present heat-mode recording material results in excellent lithographic printing properties.
  • a further suitable cross-linked hydrophilic layer is disclosed in EP-A- 514 990 .
  • the layer disclosed in this EP-application comprises the hardening reaction product of a (co)polymer containing amine or amide functions having at least one free hydrogen (e.g. amino modified dextrane) and aldehyde.
  • the cross-linked hydrophilic upper layer preferably also contains substances that increase the mechanical strength and the porosity of the layer e.g. metal oxide colloid particles which are particles of titanium dioxide or other metal oxides. Incorporation of these particles gives the surface of the cross-linked hydrophilic layer a uniform rough texture consisting of microscopic hills and valleys.
  • These particles are preferably oxides or hydroxides of beryllium, magnesium, aluminum, silicon, gadolinium, germanium, arsenic, indium, tin, antimony, tellurium, lead, bismuth or a transition metal.
  • Particularly preferable colloid particles are oxides or hydroxides of aluminum, silicon, zirconium and titanium, used in 20 to 95 % by weight of the hydrophilic layer, more preferably in 30 to 90% by weight of the hydrophilic layer.
  • the cross-linked hydrophilic upper layer is preferably coated at a dry thickness of 0.3 to 5 ⁇ m, more preferably at a dry thickness of 0.5 to 3 ⁇ m.
  • the cross-linked hydrophilic upper layer may further comprise additional substances such as e.g. plasticizers, pigments, dyes etc.
  • the cross-linked hydrophilic upper layer may also contain an IR-absorbing compound in order to increase the IR-sensitivity.
  • suitable 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, and US-P- 4 284 705.
  • the lithographic base may be an anodized aluminum support.
  • a particularly preferred lithographic base is an electrochemically grained and anodized aluminum support.
  • the anodized aluminum support may be treated to improve the hydrophilic properties of its surface.
  • the aluminum support may be silicated by treating its surface with a 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 may 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 can also be a flexible support, which is provided with a hydrophilic layer, hereinafter called 'base layer'.
  • the flexible support is e.g. paper, plastic film or aluminum.
  • the base layer is preferably a cross-linked hydrophilic layer obtained from a hydrophilic binder cross-linked with a hardening agent such as formaldehyde, glyoxal, polyisocyanate or a hydrolysed tetra-alkylorthosilicate. The latter is particularly preferred.
  • the hydrophilic binder for use in the base layer is e.g. a hydrophilic (co)polymer such as homopolymers and copolymers of vinyl alcohol, acrylamide, methylol acrylamide, methylol methacrylamide, acrylate acid, methacrylate 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% by weight, preferably 80% by weight.
  • the amount of hardening agent, in particular tetraalkyl orthosilicate, is preferably at least 0.2 parts per part by weight of hydrophilic binder, more preferably between 0.5 and 5 parts by weight, most preferably between 1 parts and 3 parts by weight.
  • the hydrophilic base layer may also contain 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 may be added e.g. silica prepared according to Stöber as described in J. Colloid and Interface Sci., Vol. 26, 1968, pages 62 to 69 or 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 surface of the hydrophilic base layer is given a uniform rough texture consisting of microscopic hills and valleys, which serve as storage places for water in background areas.
  • the thickness of the hydrophilic base layer may vary in the range of 0.2 to 25 ⁇ m and is preferably 1 to 10 ⁇ m.
  • hydrophilic base 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, and US-P- 4 284 705.
  • plastic film e.g. 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 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.
  • the heat-sensitive imaging material can be covered with an additional hydrophilic layer, provided on top of the hydrophilic upper layer discussed above, which comprises an organic compound containing cationic groups as described in EP-A -1065051.
  • the imaging material is image-wise exposed to cause removal of the cross-linked hydrophilic upper layer and whereby the exposed areas are converted to oleophilic areas while the unexposed areas remain hydrophilic.
  • This is mostly the case when using short pixel dwell times (for example 1 to 100 ns).
  • longer pixel dwell times for example 1 to 20 ⁇ s
  • the hydrophilic layer may not completely be removed upon exposure.
  • the remaining parts of the hydrophilic layer can then be removed on the press by contact with fountain solution and ink or by an additional wet or dry processing step between the IR-laser exposure and the start-up of the printing process.
  • a suitable dry processing step is e.g. mechanical treatment such as rubbing or brushing the layer with e.g.
  • a preferred additional wet processing step is a gumming step as is commonly used for conventional plates.
  • a gumming step is normally not regarded as a processing step, but rather as a treatment which protects the hydrophilic areas from fingerprints or other contamination which may affect the water-acceptance of these areas. Upon gumming the remaining ablation dust on the plate is removed thereby avoiding contamination of the press. At the same time the hydrophilic areas are covered with a thin layer of the gumming solution inducing a better start-up performance.
  • 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.
  • lasers are used that operate in the infrared or near-infrared, i.e. wavelength range of 700-1500 nm.
  • laser diodes emitting in the near-infrared with an intensity higher than 0.1 mW/ ⁇ m 2 .
  • the plate is then ready for printing without an additional development and can be mounted on the printing press.
  • the imaging material is first mounted on the printing cylinder of the printing press and then image-wise exposed directly on the press by means of an integrated image recording device. Subsequent to exposure, the imaging material is ready for printing.
  • the printing plate of the present invention can also be used in the printing process as a seamless sleeve printing plate.
  • the printing plate may be soldered in a cylindrical form by means of a laser.
  • Such cylindrical printing plate which has as diameter the diameter of the print cylinder can be slid on the print cylinder instead of mounting a conventional printing plate. More details on sleeves are given in "Grafisch Nieuws" , 15, 1995, page 4 to 6.
  • a 0.30 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 ⁇ m.
  • the aluminum foil was 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, post-treated with a solution containing polyvinylphosphonic acid and a solution containing aluminum trichloride, and subsequently rinsed with demineralized water at 20°C during 120 seconds and dried.
  • the light-sensitive layer was coated on the lithographic base at a wet coating thickness of 20 ⁇ m from a solution having the following composition: 52.00g Carbon black dispersion of the following composition : - 6.50 g Special Schwarz (trade mark from Degussa) - 0.65 g Nitrocellulose E950 (trade mark from Wolf Walsrode) - 0.78 g Dispersing agent - 44.07 g Methyl ethyl ketone 15.70g Nitrocellulose solution of the following composition - 1.57 g Nitrocellulose E950 (trade mark from Wolf Walsrode) - 14.13 g Ethylacetate 2.12g Cymel solution of the following composition - 0.42 g Cymel 301 (trade mark from Dyno Cytec) - 1.70 g Ethylacetate 0.76g p-toluene sulphonic acid solution of the following composition - 0.076 g g p-toluene sulphonic acid (ptsa) - 0.684 g E
  • the hydrophilic layer was coated to a wet coating thickness of 20 ⁇ m from a solution having the following composition 70.0g 6.25% TiO 2 -dispersion in water, stabilized with Polyviol WX 48TM (polyvinyl alcohol from Wacker); the dispersion contained 10 % polyvinyl alcohol versus TiO 2 (average particle size 0.3 to 0.5 ⁇ m) 30.0g 6.25% hydrolyzed tetramethyl orthosilicate in water/ ethanol 90:10. 1.2g 5% wetting agent in water
  • the materials 2-6 were prepared in an identical way as the comparative material described above with the only difference that in the solution of the oleophilic layer a part of the Nitrocellulose solution was replaced by a Quilon C solution (5% of the commercially available solution in Ethylacetate/isopropanol 1:1; trade mark of DuPont Corporation). The details are given in table 1.
  • the resulting imaging materials were imaged on a Creo Trendsetter 3244T TM at 2400 dpi operating at a scanning speed of 80 rpm and a laser output of 16 Watt.
  • the plate was mounted on a Sakurai Oliver 52 press using K+E 800 Skinnex as ink and 4% Aqua aid + 3% Tame as dampening liquid.
  • a non-compressible blanket was used.
  • the press was started by allowing the print cylinder with the imaging material mounted thereon to rotate.
  • the dampener rollers of the press were first dropped on the imaging material so as to supply dampening liquid to the imaging material and after 10 revolutions of the print cylinder, the ink rollers were dropped to supply ink. After 10 further revolutions, the paper supply was started.
  • the run length was determined based on the number of sheets that could be printed without toning and without significant image wear. The results are summarized in table 2. It is clear that the addition of very small amounts of Quilon C i.e. 0.75 mg/m 2 causes a significant improvement of the run length.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Materials For Photolithography (AREA)

Claims (10)

  1. Matériau thermosensible à effet négatif pour la confection d'une plaque d'impression lithographique par insolation directe de la plaque, comprenant dans l'ordre indiqué une base lithographique possédant une surface hydrophile, une couche de formation d'images oléophile et une couche supérieure hydrophile réticulée, caractérisé en ce que ladite couche de formation d'images oléophile comprend au moins un complexe de métal de transition d'un acide organique.
  2. Matériau selon la revendication 1, caractérisé en ce que ledit métal de transition est le chrome.
  3. Matériau selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite couche de formation d'images oléophile possède un poids de l'enduit sec de 0,1 à 0,75 g/m2.
  4. Matériau selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite couche de formation d'images oléophile comprend un liant thermosensible.
  5. Matériau selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite couche de formation d'images oléophile comprend du noir de carbone ou du graphite faisant office de composé absorbant les rayons infrarouges.
  6. Matériau selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite couche supérieure hydrophile réticulée comprend des oxydes ou des hydroxydes du béryllium, du magnésium, de l'aluminium, du silicium, du gadolinium, du germanium, de l'arsenic, de l'indium, de l'étain, de l'antimoine, du tellure, du plomb, du bismuth, du titane ou d'un métal de transition.
  7. Matériau selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite base lithographique est un support en aluminium grainé et anodisé ou un support flexible muni d'une couche de fond hydrophile réticulée.
  8. Matériau selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite couche supérieure hydrophile réticulée possède une épaisseur de l'enduit sec de 0,3 à 5 µm.
  9. Procédé à insolation directe de la plaque pour la confection d'une plaque d'impression lithographique comprenant les étapes consistant à
    (i) procurer un matériau tel que défini dans l'une quelconque des revendications précédentes,
    (ii) exposer ledit matériau en forme d'image à un faisceau laser infrarouge possédant une intensité supérieure à 0,1 mW/µm2,
    (iii) mettre ledit matériau au contact d'une solution de mouillage et d'un encre.
  10. Procédé selon la revendication 9, caractérisé en ce que, avant ou après l'étape (ii), ledit matériau est monté sur un cylindre d'une presse d'impression.
EP20000204092 2000-11-21 2000-11-21 Plaque d'impression lithographique sans traitement Expired - Lifetime EP1208973B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE2000610283 DE60010283T2 (de) 2000-11-21 2000-11-21 Verarbeitungsfreie Flachdruckplatte
EP20000204092 EP1208973B1 (fr) 2000-11-21 2000-11-21 Plaque d'impression lithographique sans traitement
US09/993,073 US6620573B2 (en) 2000-11-21 2001-11-19 Processless lithographic printing plate
JP2001353251A JP2002200854A (ja) 2000-11-21 2001-11-19 無処理平版印刷版

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20000204092 EP1208973B1 (fr) 2000-11-21 2000-11-21 Plaque d'impression lithographique sans traitement

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EP1208973A1 EP1208973A1 (fr) 2002-05-29
EP1208973B1 true EP1208973B1 (fr) 2004-04-28

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DE (1) DE60010283T2 (fr)

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EP0967077B1 (fr) * 1998-06-26 2003-08-20 Agfa-Gevaert Elément d'enregistrement de l'image et procédé pour la fabrication de plaques lithographiques utilisant cet élément

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JP2002200854A (ja) 2002-07-16
DE60010283T2 (de) 2005-05-19
EP1208973A1 (fr) 2002-05-29
DE60010283D1 (de) 2004-06-03

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