EP0864419B1 - Procédé de fabrication de plaques d'impression lithographiques positives - Google Patents

Procédé de fabrication de plaques d'impression lithographiques positives Download PDF

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Publication number
EP0864419B1
EP0864419B1 EP19980200433 EP98200433A EP0864419B1 EP 0864419 B1 EP0864419 B1 EP 0864419B1 EP 19980200433 EP19980200433 EP 19980200433 EP 98200433 A EP98200433 A EP 98200433A EP 0864419 B1 EP0864419 B1 EP 0864419B1
Authority
EP
European Patent Office
Prior art keywords
layer
imaging element
sensitive
hydrophobic
heat
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
EP19980200433
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German (de)
English (en)
Other versions
EP0864419A1 (fr
Inventor
Joan Vermeersch
Marc Van Damme
Johan Van Hunsel
Fred Marland
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
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Publication of EP0864419A1 publication Critical patent/EP0864419A1/fr
Application granted granted Critical
Publication of EP0864419B1 publication Critical patent/EP0864419B1/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
    • B41C1/1016—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
    • B41C1/1008—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/02—Positive working, i.e. the exposed (imaged) areas are removed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/06—Developable by an alkaline solution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/22—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by organic non-macromolecular additives, e.g. dyes, UV-absorbers, plasticisers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/24—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by a macromolecular compound or binder obtained by reactions involving carbon-to-carbon unsaturated bonds, e.g. acrylics, vinyl polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
    • B41C2210/26—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by a macromolecular compound or binder obtained by reactions not involving carbon-to-carbon unsaturated bonds
    • B41C2210/262—Phenolic condensation polymers, e.g. novolacs, resols

Definitions

  • the present invention relates to a method for making lithographic printing plates involving the use of a heat-sensitive imaging element. More in particular the present invention relates to a method wherein the heat-sensitive imaging element is exposed to an infrared laser having a pixel dwell time of less than 0.075 ⁇ s to obtain positive working printing plates with a high sensitivity.
  • Lithographic printing is the process of printing from specially prepared surfaces, some areas of which are capable of accepting ink, whereas other areas will not accept ink.
  • a photographic material is made imagewise receptive to oily or greasy ink in the photo-exposed (negative working) or in the non-exposed areas (positive working) on an ink-repelling background.
  • lithographic 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.
  • thermoplastic polymer particles By image-wise exposure to an infrared laser, the thermoplastic polymer particles are image-wise coagulated thereby rendering the surface of the imaging element at these areas ink acceptant without any further development.
  • a disadvantage of this method is that the printing plate obtained is easily damaged since the non-printing areas may become ink-accepting when some pressure is applied thereto. Moreover, under critical conditions, the lithographic performance of such a printing plate may be poor and accordingly such printing plate has little lithographic printing latitude.
  • US-P-4,708,925 discloses an imaging element including a photosensitive composition comprising an alkali-soluble novolac resin and an onium-salt. This composition can optionally contain an IR-sensitizer. After image-wise exposing said imaging element to UV-visible - or IR-radiation followed by a development step with an aqueous alkali liquid there is obtained a positive or negative working printing plate.
  • EP-A-625728 discloses an imaging element comprising a layer which is sensitive to UV- and IR-irradiation and which can be positive or negative working. This layer comprises a resole resin, a novolac resin, a latent Bronsted acid and an IR-absorbing substance.
  • EP-A-738930 discloses an image-forming element comprising a substrate, and an image-forming medium comprising (a) a compound absorbing at a first wavelenght in the UV/blue region and (b) a dye absorbing at a second wavelenght which is longer than the first wavelenght, irradiation at said second wavelenght bleaching absorption of said compound (a) at said first wavelenght.
  • suitable exposure dwell times are from about 1 ⁇ s to about 0.1 ⁇ s.
  • GB-1492070 discloses a planographic printing plate comprising a layer of material which is sensitive to ultraviolet light and overlying said layer, a second layer which is opaque to ultraviolet light and capable of being removed or rendered transparent to ultraviolet light by non-UV laser radiation.
  • EP-A-464270 discloses a method for writing characters on a tape or plate provided with radiation-sensitive portions, wherein the characters are written thereon by means of laser radiation, wherein after developing radiation -sensitive portions of the tape a protective layer is applied over at least the portions of the tape to be written on, the characters to be arranged are written onto the protective layer using the laser beam, and that the material of the radiation-sensitive portions under the parts of the protective layer that has been written on are removed.
  • FR-1561957 discloses an imaging element comprising a photosensitive layer containing a binder and a liquid and/or solid material dispersed in said binder, said liquid and/or solid material being more hydrophobic than the binder.
  • EP-A-580394 discloses different kind of imaging apparatuses based on the use of lasers as exposing units.
  • EP-A-803771 which constitutes prior art under Art.54(3) EPC for the designated states DE, FR and GB only, discloses an imaging element comprising an Ozasol N61 printing plate and provided thereon a topcoat comprising, inter alia, carbon black and nitrocellulose. After image-wise exposure by an IR-laser, the plate is rubbed with a cotton pad to remove ablated material, then exposed to UV light and finally developed with an alkaline developer.
  • the above discussed heat-sensitive imaging systems can be imaged with rotating drum image setters using one or more laser beams (resp. internal or external drum scanners).
  • a disadvantage is that the sensitivity is not always satisfactory especially when internal drum scanners are used.
  • a method for making high sensitivity lithographic printing plates comprising the steps of imagewise exposing with a laser emitting in the wavelength range of 700-1500 nm a positive heat-sensitive imaging element comprising on a lithographic base with a hydrophilic surface a hydrophobic infra-red radiation sensitive layer and, without any further treatment except an optional thermal treatment, developing said imaging element in an aqueous alkaline solution, characterised in that the infra-red laser has a pixel dwell time of less than 0.075 ⁇ s.
  • the heat-sensitive imaging element After the exposure the heat-sensitive imaging element is developed in a simple wet clean-out process by rinsing it with an aqueous alkaline solution.
  • Image-wise exposure in connection with the present invention is an image-wise scanning exposure involving the use of a laser that operates in the infrared or near-infrared, i.e. wavelength range of 700-1500 nm. Most preferred are laser diodes emitting in the near-infrared
  • an internal drum or flatbed scanner is used whereby the imaging element is exposed with one or a few laser beams having a short pixel dwell time (0.01 ⁇ s to 0.07 ⁇ s).
  • the infrared radiation sensitive layer comprises an infrared absorbing compound and a binder resin.
  • Particularly useful infrared absorbing compounds are for example infrared dyes, 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 .
  • carbon black is used as the IR-absorbing compound.
  • a binder resin cellulose and its derivatives, cellulose esters e.g. cellulose acetate, cellulose nitrate etc., a copolymer of vinylidene chloride and acrylonitrile, poly(meth)acrylates, polyvinyl chloride, phenolic resins e.g.
  • phenol formaldehyde cresol formaldehyde, novolac etc.
  • polyesters aromatic or aliphatic
  • polystyrenes polystyrenes
  • polycarbonates e.g. bisphenol A containing polycarbonates and copolymers or terpolymers of the above can be used.
  • the present invention may comprise a thermally hardenable layer, comprising a self hardening hydrophobic polymer or a hardener and a hydrophobic polymerand being soluble in an aqueous developing solution more preferably an aqueous alkaline developing solution with preferentially a pH between 7.5 and 14.
  • the alkali soluble binders used in this layer are preferably hydrophobic binders as used in conventional positive or negative working PS-plates e.g. novolac, polyvinyl phenols, carboxy substituted polymers etc. Typical examples of these polymers are descibed in DE-A-4007428, DE-A-4027301 and DE-A-4445820.
  • the hydrophobic binder used in connection with the present invention is further characterised by: insolubility in water and partial solubility/swellability in an alkaline solution and/or partial solubility in water when combined with a cosolvent.
  • this aqueous alkali soluble layer is preferably a visible light- or UV-desensitised layer that is thermally hardenable and ink-accepting.
  • This visible light- or UV-desensitised layer does not comprise photosensitive ingredients such as diazo compounds, photoacids, photoinitiators, quinone diazides, sensitisers etc. which absorb in the wavelength range of 250nm to 650nm.
  • the lithographic base can be an anodised aluminum.
  • a particularly preferred lithographic base 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 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 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. It is further evident that one or more of these post treatments may be carried out alone or in combination.
  • the lithographic base 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 crosslinking 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.
  • a cross-linked hydrophilic layer in a lithographic base used in accordance with the present embodiment preferably also contains substances that increase the mechanical strength and the porosity of the layer.
  • colloidal silica may be used.
  • the colloidal silica employed may be in the form of any commercially available water-dispersion of colloidal silica for example having an average particle size up to 40 nm, e.g. 20 nm.
  • inert particles of larger size than the colloidal silica can be added e.g. silica prepared according to Stöber as described in J. Colloid and Interface Sci., Vol.
  • alumina particles or particles having an average diameter of at least 100 nm which are particles of titanium dioxide or other heavy metal oxides.
  • the thickness of a cross-linked hydrophilic layer in a lithographic base in accordance with this embodiment may vary in the range of 0.2 to 25 ⁇ m and is preferably 1 to 10 ⁇ m.
  • cross-linked hydrophilic layers for use in accordance with the present invention are disclosed in EP-A 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, 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 element is, without any additional treatment except a thermal treatment, developed by rinsing it with an aqueous alkaline developing solution.
  • This development is a simple clean-out process whereby developing solutions with a pH between 7.5 and 14 such as the developing solutions that are used for developing conventional positive or negative working presensitised printing plates are employed. No additional pre-processing steps such as pre-baking are performed.
  • the obtained plate After the wet development of the image-wise exposed imaging element with an aqueous alkaline solution and drying, the obtained plate can be used as a printing plate as such. However, to improve durability it is still possible to bake said plate at a temperature between 200°C and 250°C for a period of 5 minutes to 1 minute.
  • Example 1 Positive working thermal plate which is imageable with pixel times ⁇ 0.075 ⁇ s
  • the UV-sensitive layer of the Ozasol N61 printing plate was coated by means of a knife coater with the IR-sensitive formulation to a wet coating thickness of 20 ⁇ m
  • the IR-sensitive printing plate was subjected to a scannnig Nd YAG infrared laser emitting at 1064 nm in-an internal drum configuration (scan speed 218 m/s, pixel time 0.05 ⁇ s, spot size 14 ⁇ m and the power on the surface of the imaging element was varied from 2 to 6W). After this exposure the IR-sensitive mask has partly disappeared in areas exposed to the laser-beam. Further the imaging element was subjected to a developing process with Ozasol EN143 (developing solution available from AGFA), hereby removing the IR-imaged parts and resulting in a positive printing plate. The sensitivity measured was 60mJ/cm 2 . After processing, the printing plate was mounted on a GTO46 offset-press. As an ink was used K+E 123W and as a fountain solution Rotamatic. Printing was started and a good printing quality was obtained without any ink uptake in the IR-imaged parts.
  • Example 2 Positive working thermal plate based on an alkali-soluble binder. IR-laser exposure with short pixel dwell time(0.05 ⁇ s)
  • a 0.20 mm thick aluminum foil was degreased by immersing the foil in an aqueous solution containing 5 g/l of sodium hydroxide at 50°C and rinsed with demineralized water.
  • the foil was then electrochemically grained using an alternating current in an aqueous solution containing 4 g/l of hydrochloric acid, 4 g/l of hydroboric acid and 5 g/l of aluminum ions at a temperature of 35°C and a current density of 1200 A/m 2 to form a surface topography with an average center-line roughness Ra of 0.5 ⁇ m.
  • 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 at 25°C for 30 seconds.
  • the foil was subsequently subjected to anodic oxidation in an aqueous solution containing 200 g/l of sulfuric acid at a temperature of 45°C, a voltage of about 10 V and a current density of 150 A/m 2 for about 300 seconds to form an anodic oxidation film of 3.00 g/m 2 of Al 2 O 3 , then washed with demineralized water, posttreated with a solution containing 20 g/l of sodium bicarbonate at 40°C for 30 seconds, subsequently rinsed with demineralized water at 20°C during 120 seconds and dried.
  • MARUKA LYNCUR M H-2 homopolymer of polyvinylphenol from Maruzen Co.
  • methyl ethyl ketone methyl ethyl ketone
  • This layer was dried for 10 minutes at 40°C.
  • Upon this layer was then coated, with a wet coating thickness of 20 ⁇ m, the IR-sensitive formulation on basis of a carbon black dispersion, with the following ingredients in parts by weight, as indicated.
  • the IR-sensitive coating was dried for 2 minutes at 120°C.
  • the IR-sensitive printing plate was subjected to a scannnig NdYAG infrared laser emitting at 1064 nm in an internal drum configuration (scan speed 218 m/s, pixel time 0.05 ⁇ s, spot size 14 ⁇ m and the power on the surface of the imaging element was varied from 2 Watts to 6 Watts). After this exposure the IR-sensitive mask has partly disappeared in areas exposed to the laser-beam. Further the imaging element was subjected to a developing process with Ozasol EP26 (developing solution available fron AGFA), hereby removing the IR-imaged parts and resulting in a positive printing plate. The sensitivity measured was 45mJ/cm 2 . After processing, the printing plate was mounted on a GTO46 offset-press. As an ink was used K+E 123W and as a fountain solution Rotamatic. Printing was started and a good printing quality was obtained without any ink uptake in the IR-imaged parts.

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

Claims (10)

  1. Un procédé pour faire des plaques d'impression lithographiques à sensibilité élevée comprenant les phases consistant à exposer sous forme d'image avec un laser émettant dans le domaine de longueurs d'onde de 700 - 1500 nm un élément formateur d'image thermosensible à effet positif comprenant sur une base lithographique munie d'une surface hydrophile une couche hydrophobe sensible au rayonnement infrarouge, et à développer, sans autre traitement supplémentaire à l'exception d'un éventuel traitement thermique, ledit élément formateur d'image dans une solution alcaline aqueuse, caractérisé en ce que le laser infrarouge a un temps de séjour de pixels inférieur à 0,075 µs.
  2. Un procédé selon la revendication 1, caractérisé en ce que ledit élément formateur d'image thermosensible est exposé sur un scanner à tambour interne ou sur un scanner à plat.
  3. Un procédé selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que ledit élément formateur d'image thermosensible est développé dans un simple procédé de nettoyage humide en le rinçant avec une solution de développement alcaline aqueuse.
  4. Un procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite couche hydrophobe sensible au rayonnement infrarouge comprend un absorbant infrarouge et un liant de résine.
  5. Un procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite couche hydrophobe sensible au rayonnement infrarouge comprend de la nitrocellulose.
  6. Un procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit élément formateur d'image comprend une couche thermodurcissable entre la base lithographique et la couche hydrophobe sensible au rayonnement infrarouge, cette couche thermodurcissable étant soluble dans une solution de développement aqueuse et comprenant un polymère hydrophobe autodurcissable ou un durcissant et un polymère hydrophobe.
  7. Un procédé selon la revendication 6, caractérisé en ce que ledit polymère hydrophobe autodurcissable est une résine phénolique.
  8. Un procédé selon l'une quelconque des revendications 6 ou 7, caractérisé en ce que ladite'couche thermodurcissable est rendue insensible à la lumière visible ou ultraviolette.
  9. Un procédé selon l'une quelconque des revendications 6 à 8, caractérisé en ce que ladite couche thermodurcissable accepte l'encre.
  10. Un élément formateur d'image thermosensible selon l'une quelconque des revendications 7 à 9, caractérisé en ce que ladite couche thermodurcissable accepte l'encre.
EP19980200433 1997-03-11 1998-02-11 Procédé de fabrication de plaques d'impression lithographiques positives Expired - Lifetime EP0864419B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US4040797P 1997-03-11 1997-03-11
US40407P 1997-03-11

Publications (2)

Publication Number Publication Date
EP0864419A1 EP0864419A1 (fr) 1998-09-16
EP0864419B1 true EP0864419B1 (fr) 2002-08-07

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EP (1) EP0864419B1 (fr)
JP (1) JPH10254143A (fr)
DE (1) DE69806986T2 (fr)

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Publication number Priority date Publication date Assignee Title
US6485890B2 (en) 1996-04-23 2002-11-26 Kodak Polychrome Graphics, Llc Lithographic printing forms

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US6117610A (en) 1997-08-08 2000-09-12 Kodak Polychrome Graphics Llc Infrared-sensitive diazonaphthoquinone imaging composition and element containing non-basic IR absorbing material and methods of use
US6063544A (en) * 1997-03-21 2000-05-16 Kodak Polychrome Graphics Llc Positive-working printing plate and method of providing a positive image therefrom using laser imaging
US6090532A (en) * 1997-03-21 2000-07-18 Kodak Polychrome Graphics Llc Positive-working infrared radiation sensitive composition and printing plate and imaging method
ATE204388T1 (de) 1997-07-05 2001-09-15 Kodak Polychrome Graphics Llc Bilderzeugungsverfahren
US6060217A (en) 1997-09-02 2000-05-09 Kodak Polychrome Graphics Llc Thermal lithographic printing plates
EP1449655A1 (fr) 1997-10-17 2004-08-25 Fuji Photo Film Co., Ltd. Produit formateur d'image photosensible travaillant en positif pour laser infra-rouge et composition travaillant en positif pour laser infra-rouge
US6352812B1 (en) 1998-06-23 2002-03-05 Kodak Polychrome Graphics Llc Thermal digital lithographic printing plate
US6352811B1 (en) 1998-06-23 2002-03-05 Kodak Polychrome Graphics Llc Thermal digital lithographic printing plate
US6534238B1 (en) 1998-06-23 2003-03-18 Kodak Polychrome Graphics, Llc Thermal digital lithographic printing plate
US6358669B1 (en) 1998-06-23 2002-03-19 Kodak Polychrome Graphics Llc Thermal digital lithographic printing plate
EP1023994B1 (fr) * 1999-01-26 2004-04-28 Agfa-Gevaert Un élément pour l'enregistrement de l'image thermosensible pour la fabrication de plaques lithographiques positives
US6472119B1 (en) 1999-01-26 2002-10-29 Agfa-Gavaert Heat mode sensitive imaging element for making positive working printing plates
US6186067B1 (en) * 1999-09-30 2001-02-13 Presstek, Inc. Infrared laser-imageable lithographic printing members and methods of preparing and imaging such printing members
US6378432B1 (en) * 2000-05-03 2002-04-30 Presstek, Inc. Lithographic imaging with metal-based, non-ablative wet printing members
US6506533B1 (en) 2000-06-07 2003-01-14 Kodak Polychrome Graphics Llc Polymers and their use in imagable products and image-forming methods
US6558872B1 (en) 2000-09-09 2003-05-06 Kodak Polychrome Graphics Llc Relation to the manufacture of masks and electronic parts

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WO1996002021A1 (fr) * 1994-07-11 1996-01-25 Konica Corporation Element initial pour plaque lithographique et procede de preparation de ladite plaque
EP0803771A1 (fr) * 1996-04-23 1997-10-29 Agfa-Gevaert N.V. Méthode pour la fabrication d'une plaque lithographique utilisant un élément formateur d'image contenant un masque thermosensible
EP0839647B2 (fr) * 1996-10-29 2014-01-22 Agfa Graphics N.V. Procédé de fabrication d'une plaque d'impression lithographique à prise d'encre améliorée

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6485890B2 (en) 1996-04-23 2002-11-26 Kodak Polychrome Graphics, Llc Lithographic printing forms

Also Published As

Publication number Publication date
JPH10254143A (ja) 1998-09-25
EP0864419A1 (fr) 1998-09-16
DE69806986T2 (de) 2003-05-08
DE69806986D1 (de) 2002-09-12

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