EP1065053B1 - Verarbeitungsfreie Flachdruckplatte mit niedrigem anorganisches Pigment/Härter Verhältnis - Google Patents

Verarbeitungsfreie Flachdruckplatte mit niedrigem anorganisches Pigment/Härter Verhältnis Download PDF

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Publication number
EP1065053B1
EP1065053B1 EP19990202112 EP99202112A EP1065053B1 EP 1065053 B1 EP1065053 B1 EP 1065053B1 EP 19990202112 EP19990202112 EP 19990202112 EP 99202112 A EP99202112 A EP 99202112A EP 1065053 B1 EP1065053 B1 EP 1065053B1
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EP
European Patent Office
Prior art keywords
heat
sensitive material
material according
hydrophilic
layer
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
EP19990202112
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English (en)
French (fr)
Other versions
EP1065053A1 (de
Inventor
Marc C/O Agfa-Gevaert N.V. Van Damme
Joan C/O Agfa-Gevaert N.V. 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
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 EP19990202112 priority Critical patent/EP1065053B1/de
Priority to DE1999614589 priority patent/DE69914589T2/de
Priority to US09/577,485 priority patent/US6555285B1/en
Priority to JP2000191223A priority patent/JP2001039046A/ja
Publication of EP1065053A1 publication Critical patent/EP1065053A1/de
Application granted granted Critical
Publication of EP1065053B1 publication Critical patent/EP1065053B1/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
    • B41C1/1008—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
    • 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
    • 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
    • B41C2210/14—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
    • B41C2210/20—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by inorganic additives, e.g. pigments, salts
    • 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 heat mode recording material for making a lithographic plate for use in lithographic printing.
  • the present invention further relates to a method for imaging said heat mode recording material e.g. by means of a laser.
  • 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 (hydrophilic areas).
  • oleophilic areas areas of which are capable of accepting ink
  • hydrophilic areas areas of which are capable of accepting ink
  • hydrophilic areas are applied to the plate surface that contains hydrophilic and oleophilic areas.
  • the hydrophilic areas will be soaked with water or the dampening liquid and are thereby rendered oleophobic while the oleophilic areas will accept the ink.
  • 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 the areas of the recording material that have been exposed are rendered ink accepting.
  • DE-A- 2 448 325 concern "direct negative" printing plates comprising e.g. hydrophilic aluminium 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 include e.g. US-A- 4 341 183, 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 have on an anodized aluminium support a hydrophilic layer.
  • the disclosed heat mode recording materials are image-wise exposed using a laser.
  • Laser exposure renders the exposed areas insoluble and ink receptive, whereas the non exposed image portions remain hydrophilic and water soluble allowing to be removed by the dampening liquid during printing exposing the hydrophilic support.
  • Such plates can be used directly on the press without processing.
  • DD-A- 155 407 discloses a laser heat mode "direct negative" printing plate where a hydrophilic aluminum oxide layer is rendered oleophilic by direct laser heat mode imaging. These printing plates may also be used on the press without further processing.
  • EP-A- 580 393 discloses a 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. The lithographic properties of said material are not very good.
  • WO99/19143 discloses a heat mode printing plate element which comprises a support, an IR-sensitive oleophilic layer and a hydrophilic top layer comprising a cross-linked polymeric matrix containing a colloid of an oxide or hydroxide of a metal and a photothermal conversion material.
  • a heat-sensitive material for making lithographic plates comprising in the order given on a support an IR-sensitive oleophilic layer and a cross-linked hydrophilic layer comprising a hydrophilic organic polymer, an inorganic pigment and a hardener, wherein the ratio of said inorganic pigment over the hardener is comprised between 75/25 and 25/75 by weight.
  • the IR-sensitive oleophilic layer amounts preferably to a dry weight between 0.10 and 0.75 g/m2, more preferably between 0.15 and 0.5 g/m2.
  • the IR-sensitive oleophilic 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, bronze-structured oxides and oxides structurally related to the bronze family but lacking the A component e.g. WO2.9.
  • conductive polymer dispersion such as polypyrrole or polyaniline-based conductive polymer dispersions.
  • the lithographic performance and in particular the print endurance obtained depends i.a.on the heat-sensitivity of the imaging element. In this respect it has been found that carbon black or graphite yields very good and favorable results.
  • the binder is selected from the group consisting of polyvinyl chloride, polyesters, polyurethanes, novolac, polyvinyl carbazole etc., copolymers or mixtures thereof.
  • the polymeric binder in the recording layer is heat sensitive: e.g. a polymer containing nitrate ester groups (e.g. self oxidizing binder cellulose nitrate as disclosed in GB-P- 1 316 398 and DE-A- 2 512 038 ); e.g. a polymer containing carbonate groups (e.g. polyalkylene carbonate); e.g. a polymer containing covalently bound chlorine (e.g. polyvinylidene chloride). Also substances containing azo or azide groups , capable of liberating N 2 upon heating are favourably used.
  • nitrate ester groups e.g. self oxidizing binder cellulose nitrate as disclosed in GB-P- 1 316 398 and DE-A- 2 512 038
  • carbonate groups e.g. polyalkylene carbonate
  • chlorine e.g. polyvinylidene chloride
  • substances containing azo or azide groups capable of liberating N 2 upon heating
  • hydrophilic coatings are preferably cast 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 polymers for hydrophilic layers may be selected from the group consisting of gum arabic, casein, gelatin, starch derivatives, carboxymethyl cellulose and Na salt thereof, cellulose acetate, sodium alginate, vinyl acetate-maleic acid copolymers, styrenemaleic 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-P- 3 476 937 are particularly preferred because their use in the present heat mode recording material results in excellent lithographic printing properties.
  • a cross-linked hydrophilic binder in the heat-sensitive layer used in accordance with the present embodiment also contains colloidal inorganic pigments that increase the mechanical strength and the porosity of the layer e.g. metal oxide 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.
  • metal oxide 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 oxides or hydroxydes of beryllium, magnesium, aluminium, silicon, gadolinium, germanium, arsenic, indium, tin, antimony, tellurium, lead, bismuth, titanium or a transition metal.
  • Particularly preferable colloid particles are oxides or hydroxides of aluminum, silicon, zirconium or titanium, used in at most 75 % by weight of the hydrophilic layer.
  • the cross-linked hydrophilic 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 hardened hydrophilic layer may comprise additional substances such as e.g. plasticizers, pigments, dyes etc.
  • the cross-linked hydrophilic layer can additionally 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, US-P- 4 284 705 and EP-A- 514 490 .
  • the support according to the present invention can be a dimensionally stable support e.g. aluminum or another metal or alloy or it can be a flexible support e.g. polyethylene terephthalate.
  • the support is a lithographic base with a hydrophilic surface.
  • the lithographic base may be an anodised aluminum support.
  • 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. Further, 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 with 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-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, 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 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 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 cross-linked hydrophilic 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 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.
  • plastic film e.g. substrated polyethylene terephthalate film, substrated polyethylene naphthalate film, cellulose acetate film, polystyrene film, polycarbonate film etc.
  • the plastic film support may be opaque or transparent.
  • glass with a thickness less than 1.2 mm and a failure stress (under tensile stress) equal or higher than 5 x 107.
  • the amount of silica in the adhesion improving layer is between 200 mg per m2 and 750 mg per m2.
  • 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 m2 per gram, more preferably at least 500 m2 per gram.
  • the imaging element is image-wise exposed.
  • the cross-linked hydrophilic layer can be removed and said 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). However when using longer pixel dwell times (for example 1 to 20 ⁇ s) the hydrophilic layer is not or only partially removed upon exposure.
  • the remaining parts of the hydrophilic layer can 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.
  • 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.
  • a laser or L.E.D Preferably used are lasers that operate in the infrared or near-infrared, i.e. wavelength range of 700-1500 nm. Most preferred are laser diodes emitting in the near-infrared with an intensity greater than 0.1 mW/ ⁇ m2.
  • the plate is then ready for printing without an additional development and can be mounted on the printing press.
  • the imaging element is first mounted on the printing cylinder of the printing press and then image-wise exposed directly on the press. Subsequent to exposure, the imaging element 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 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 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.
  • the following example illustrates the present invention without limiting it thereto. All parts and percentages are by weight unless otherwise specified.
  • 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/m2 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/m2 for about 300 seconds to form an anodic oxidation film of 3.00 g/m2 of Al2O3 then washed with demineralized water, posttreated with a solution containing polyvinylphosphonic acid and subsequently with a solution containing aluminum trichloride, rinsed with demineralized water at 20°C during 120 seconds and dried.
  • the hydrophilic layer was coated to a wet coating thickness of 20 ⁇ m from a solution having the following compositions
  • Element 6, 7 and 8 are identical to elements 1, 2 and 3 with the exception that SiO2 is replaced by TiO2.
  • the resulting imaging elements were imaged on a Gerber C42 TTM at 2400 dpi operating at a scanning speed of 150 rps and a laser output of 7.5 Watt

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

Claims (11)

  1. Ein wärmeempfindliches Material zur Herstellung von lithografischen Druckplatten, das der Reihe nach auf einem Träger eine gegenüber Infrarotstrahlung empfindliche oleophile Schicht und eine vernetzte hydrophile Schicht mit einem hydrophilen organischen Polymer, einem anorganischen Pigment und einem Härter enthält, dadurch gekennzeichnet, dass das Gewichtsverhältnis des anorganischen Pigments zum Härter zwischen 75/25 und 25/75 liegt.
  2. Wärmeempfindliches Material nach Anspruch 1, dadurch gekennzeichnet, dass der Träger eine lithografische Unterlage mit einer hydrophilen Oberfläche ist.
  3. Wärmeempfindliches Material nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die gegenüber Infrarotstrahlung empfindliche oleophile Schicht in einem Trockengewicht zwischen 0,1 und 0,75 g/m2 aufgetragen wird.
  4. Wärmeempfindliches Material nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die oleophile Schicht ein Bindemittel und eine Verbindung, die Licht in Wärme umzuwandeln vermag, enthält.
  5. Wärmeempfindliches Material nach Anspruch 4, dadurch gekennzeichnet, dass das oleophile Bindemittel wärmeempfindlich ist.
  6. Wärmeempfindliches Material nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die Verbindung, die Licht in Wärme umzuwandeln vermag, Ruß oder Grafit ist.
  7. Wärmeempfindliches Material nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die vernetzte hydrophile Schicht Oxide oder Hydroxide von Beryllium, Magnesium, Aluminium, Silicium, Gadolinium, Germanium, Arsen, Indium, Zinn, Antimon, Tellur, Blei, Wismut, Titan oder einem Übergangsmetall enthält.
  8. Wärmeempfindliches Material nach einem der Ansprüche 2 bis 7, dadurch gekennzeichnet, dass die lithografische Unterlage ein gekörnter und eloxierter Aluminiumträger ist.
  9. Wärmeempfindliches Material nach einem der Ansprüche 2 bis 7, dadurch gekennzeichnet, dass die lithografische Unterlage eine vernetzte hydrophile Schicht auf einem biegsamen Träger ist.
  10. Wärmeempfindliches Material nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die hydrophile Schicht eine Trockenschichtstärke zwischen 0,3 und 5 µm aufweist.
  11. Ein durch die nachstehenden Schritte gekennzeichnetes Verfahren zur Herstellung von lithografischen Druckplatten : (i) bildmäßige Belichtung eines wärmeempfindlichen Materials nach einem der Ansprüche 1 bis 10 mit einem Laserstrahl mit einer Stärke von mehr als 0,1 mW/µm2, (ii) vor oder nach Schritt (i) das Einspannen der Platte in eine Druckpresse und (iii) das Inkontaktbringen der Platte mit Feuchtwasser und Druckfarbe.
EP19990202112 1999-06-29 1999-06-29 Verarbeitungsfreie Flachdruckplatte mit niedrigem anorganisches Pigment/Härter Verhältnis Expired - Lifetime EP1065053B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP19990202112 EP1065053B1 (de) 1999-06-29 1999-06-29 Verarbeitungsfreie Flachdruckplatte mit niedrigem anorganisches Pigment/Härter Verhältnis
DE1999614589 DE69914589T2 (de) 1999-06-29 1999-06-29 Verarbeitungsfreie Flachdruckplatte mit niedrigem anorganisches Pigment/Härter Verhältnis
US09/577,485 US6555285B1 (en) 1999-06-29 2000-05-25 Processless printing plate with low ratio of an inorganic pigment over hardener
JP2000191223A JP2001039046A (ja) 1999-06-29 2000-06-26 無機顔料対硬膜剤の低い比率を有する無処理印刷版

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19990202112 EP1065053B1 (de) 1999-06-29 1999-06-29 Verarbeitungsfreie Flachdruckplatte mit niedrigem anorganisches Pigment/Härter Verhältnis

Publications (2)

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EP1065053A1 EP1065053A1 (de) 2001-01-03
EP1065053B1 true EP1065053B1 (de) 2004-02-04

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DE (1) DE69914589T2 (de)

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Publication number Priority date Publication date Assignee Title
US6720130B1 (en) 2002-10-08 2004-04-13 Kodak Polychrome Graphics Llc Radiation sensitive lithographic printing plate precursors having ablation-free imageable composition and method

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Publication number Priority date Publication date Assignee Title
JPS55105560A (en) * 1979-02-07 1980-08-13 Tomoegawa Paper Co Ltd Photoengraving by laser
JP3625089B2 (ja) * 1995-09-13 2005-03-02 富士写真フイルム株式会社 湿し水不要平版印刷版の形成方法
GB9702568D0 (en) * 1997-02-07 1997-03-26 Horsell Graphic Ind Ltd Planographic printing
US6090524A (en) * 1997-03-13 2000-07-18 Kodak Polychrome Graphics Llc Lithographic printing plates comprising a photothermal conversion material

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DE69914589D1 (de) 2004-03-11
JP2001039046A (ja) 2001-02-13
EP1065053A1 (de) 2001-01-03

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