EP0800928B1 - Elément d'enregistrement thermosensible et procédé pour la fabrication de plaques lithographiques utilisant cet élément - Google Patents

Elément d'enregistrement thermosensible et procédé pour la fabrication de plaques lithographiques utilisant cet élément Download PDF

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Publication number
EP0800928B1
EP0800928B1 EP19970200832 EP97200832A EP0800928B1 EP 0800928 B1 EP0800928 B1 EP 0800928B1 EP 19970200832 EP19970200832 EP 19970200832 EP 97200832 A EP97200832 A EP 97200832A EP 0800928 B1 EP0800928 B1 EP 0800928B1
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EP
European Patent Office
Prior art keywords
imaging element
heat sensitive
element according
sensitive imaging
heat
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Expired - Lifetime
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EP19970200832
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German (de)
English (en)
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EP0800928A1 (fr
Inventor
Marc Van Damme
Joan Vermeersch
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Agfa Gevaert NV
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Agfa Gevaert NV
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Priority to EP19970200832 priority Critical patent/EP0800928B1/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
    • B41C1/1025—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
    • B41C2210/06—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
    • B41C2210/24—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 heat sensitive material for making a lithographic printing plate.
  • the present invention further relates to a method for preparing a printing plate from said heat sensitive material.
  • 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 ink in the photo-exposed (negative working) or in the non-exposed areas (positive working) on a hydrophilic 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.
  • EP-A-514145 discloses a heat sensitive imaging element including a coating comprising core-shell particles having a water insoluble heat softenable core component and a shell component which is soluble or swellable in aqueous alkaline medium.
  • Red or infrared laser light directed image-wise at said imaging element causes selected particles to coalesce, at least partially, to form an image and the non-coalesced particles are then selectively removed by means of an aqueous alkaline developer. Afterwards a baking step is performed.
  • the printing endurance of a so obtained printing plate is low.
  • EP-A-599510 discloses a heat sensitive imaging element which comprises a substrate coated with (i) a layer which comprises (1) a disperse phase comprising a water-insoluble heat softenable component A and (2) a binder or continuous phase consisting of a component B which is soluble or swellable in aqueous, preferably aqueous alkaline medium, at least one of components A and B including a reactive group or precursor therefor, such that insolubilisation of the layer occurs at elevated temperature and/or on exposure to actinic radiation , and (ii) a substance capable of strongly absorbing radiation and transferring the energy thus obtained as heat to the disperse phase so that at least partial coalescence of the coating occurs.
  • said plate After image-wise irradiation of the imaging element and developing the image-wise irradiated plate, said plate is heated and/or subjected to actinic irradiation to effect insolubilisation.
  • the printing endurance of a so obtained printing plate is low.
  • 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. The printing results of a lithographic plate obtained by irradiating and developing said imaging element are poor.
  • US-P-5,340,699 is almost identical with EP-A-625728 but discloses the method for obtaining a negative working IR-laser recording imaging element.
  • the IR-sensitive layer comprises a resole resin,a novolac resin, a latent Bronsted acid and an IR-absorbing substance.
  • the printing results of a lithographic plate obtained by irradiating and developing said imaging element are poor.
  • US-P-4,708,925 discloses a positive working 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 eventually IR-radiation followed by a development step with an aqueous alkali liquid there is obtained a positive working printing plate. The printing results of a lithographic plate obtained by irradiating and developing said imaging element are poor.
  • FR 1,561,957 discloses an imaging element comprising atleast a recording layer comprising a binder and a liquid or solid compound dispersed in said binder, the liquid or solid compound being more hydrophobic than the binder and forming at least partially a mixture compatible with said binder when heated.
  • Said binders can be compounds which are insoluble in water or only partially soluble in wateri.e. binders which comprise only a limited number of solubilizing groups such as alcohols or acids. The printing results of a lithographic plate obtained by irradiating and developing said imaging element are poor.
  • a heat sensitive imaging element comprising on a hydrophilic surface of a lithographic base an image forming layer comprising hydrophobic thermoplastic polymer particles dispersed in a water insoluble alkali soluble or swellable resin and a compound capable of converting light into heat, said compound being present in said image forming layer or a layer adjacent thereto, characterized in that said alkali swellable or soluble resin comprises phenolic hydroxy groups.
  • a method for obtaining a lithographic printing plate comprising the steps of:
  • lithographic printing plates of high quality can be obtained according to the method of the present invention using an imaging element as described above. More precisely it has been found that said printing plates are of high quality and are provided in a convenient way, thereby offering economical and ecological advantages.
  • a compound is insoluble in a solvent when less than 0.1 g of said compound dissolves in said solvent at 20 ° C and it is said that a compound is soluble in a solvent when at least 1 g of said compound dissolves in said solvent at 20 ° C.
  • 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 water insoluble alkali soluble or swellable resin having phenolic hydroxy groups as hydrophilic binder.
  • Preferred hydrophilic binders for use in an image forming layer in connection with this invention are for example synthetic novolac resins such as ALNOVOL, a registered trade mark of Reichold Hoechst and DUREZ, a registered trade mark of OxyChem and synthetic polyvinylfenols such as MARUKA LYNCUR M, a registered trade mark of Dyna Cyanamid.
  • synthetic novolac resins such as ALNOVOL, a registered trade mark of Reichold Hoechst and DUREZ
  • OxyChem and synthetic polyvinylfenols such as MARUKA LYNCUR M
  • Dyna Cyanamid a registered trade mark of Dyna Cyanamid.
  • the hydrophilic binder used in connection with the present invention is preferably not cross-linked or only slightly cross-linked.
  • 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 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 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.
  • 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.
  • an image forming layer on top of a hydrophilic surface there is provided an image forming layer.
  • an image forming layer in connection with the present invention comprises thermoplastic polymer particles dispersed in a water insoluble alkali soluble or swellable resin having phenolic hydroxy groups as hydrophilic binder.
  • 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 in an aqueous liquid.
  • hydrophobic polymer particles for use in connection with the present invention are e.g. polyethylene, polyvinyl chloride, polymethyl (meth)acrylate, polyethyl (meth)acrylate, polyvinylidene chloride, polyacrylonitrile, polyvinyl carbazole etc. or copolymers thereof. Most preferably used is polyethylene.
  • 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 between 20% by weight and 65% by weight and more preferably between 25% by weight and 55% by weight and most preferably between 30% by weight and 45% by weight.
  • the image forming layer can also comprise crosslinking agents although this is not necessary.
  • Preferred crosslinking agents are low molecular weight substances comprising a methylol group such as for example melamine-formaldehyde resins, glycoluril-formaldehyde resins, thiourea-formaldehyde resins, guanamine-formaldehyde resins, benzoguanamine-formaldehyde resins.
  • a number of said melamine-formaldehyde resins and glycoluril-formaldehyde resins are commercially available under the trade names of CYMEL (Dyno Cyanamid Co., Ltd.) and NIKALAC (Sanwa Chemical Co., Ltd.)
  • the imaging element further includes a compound capable of converting light to heat.
  • This compound is preferably comprised in the image forming layer but can also be provided in a layer adjacent to the image forming layer.
  • Suitable compounds capable of converting light into heat are preferably infrared absorbing components although the wavelength of absorption is not of particular importance as long as the absorption of the compound used is in the wavelength range of the light source used for image-wise exposure.
  • Particularly useful compounds are for example dyes and in particular infrared dyes, carbon black, metal carbides, borides, nitrides, carbonitrides, bronze-structured oxides and oxides structurally related to the bronze family but lacking the A component e.g. WO 2.9 .
  • conductive polymer dispersion such as polypyrrole or polyaniline-based conductive polymer dispersions.
  • the lithographic performance and in particular the print endurance obtained depends on the heat-sensitivity of the imaging element. In this respect it has been found that carbon black yields very good and favorable results.
  • a light to heat converting compound in connection with the present invention is most preferably added to the image forming layer but at least part of the light to heat converting compound may also be comprised in a neighbouring layer.
  • Such layer can be for example the cross-linked hydrophilic layer of the lithographic base according to the second embodiment of lithographic bases explained above.
  • the imaging element is image-wise exposed and subsequently developed with an aqueous alkaline solution
  • Image-wise exposure in connection with the present invention is preferably an image-wise scanning exposure involving the use of a laser or L.E.D.. It is highly preferred in connection with the present invention to use a laser emitting in the infrared (IR) and/or near-infrared, i.e. emitting in the wavelength range 700-1500nm. Particularly preferred for use in connection with the present invention are laser diodes emitting in the near-infrared.
  • IR infrared
  • near-infrared i.e. emitting in the wavelength range 700-1500nm.
  • laser diodes emitting in the near-infrared are particularly preferred for use in connection with the present invention.
  • an image-wise exposed imaging element with an aqueous alkaline solution and drying the obtained plate can be used as a printing plate as such.
  • the exposed and developed plates can be baked at a temperature of 230 ° C for 5 minutes, at a temperature of 150 ° C for 10 minutes or at a temperature of 120 ° C for 30 minutes.
  • 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 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, 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.
  • the grained and anodized lithographic base was then submersed in an aqueous solution containing 5 % w/w of citric acid for 60 seconds, rinsed with demineralized water and dried at 40°C.
  • An imaging element according to the invention was produced by preparing the following coating composition and coating it to the above described lithographic base in an amount of 30 g/m 2 (wet coating amount) and drying it at 35°C.
  • MARUKA LYNCUR M H-2 (a homopolymer of polyvinylphenol from Maruzen Co.) was added 14.32 g of a 1 % w/w NaOH solution in water.
  • An imaging element as described above was subjected to a scanning NdYLF infra red laser emitting at 1.05 ⁇ m (scanspeed 4 m/s and 8 m/s, spot size 15 ⁇ m and the power on the plate surface was varied from 120 to 540 mW ).
  • the plate was processed with Fuji PS-plate developer DP-5 (an alkaline aqueous developer) to remove the unexposed areas resulting in a negative working lithographic printing plate.
  • the obtained lithographic printing plate could be used to print on a conventional offset press using a commonly employed ink and fountain. Excellent copies and a high printing endurance were obtained.

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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)

Claims (10)

  1. Un élément formateur d'image thermosensible comprenant sur une surface hydrophile d'une base lithographique une couche formatrice d'image comprenant des particules polymères thermoplastiques hydrophobes dispersées dans une résine insoluble dans l'eau et soluble ou gonflable dans un alcali et un composé capable de convertir la lumière en chaleur, lequel composé est présent dans ladite couche formatrice d'image ou dans une couche adjacente à celle-ci, caractérisé en ce que ladite résine soluble ou gonflable dans un alcali comprend des groupes hydroxy phénoliques.
  2. Un élément formateur d'image thermosensible selon la revendication 1, caractérisé en ce que ladite résine insoluble dans l'eau et soluble ou gonflable dans un alcali comprenant des groupes hydroxy phénoliques est une résine novolaque ou une résine de polyvinylphénol.
  3. Un élément formateur d'image thermosensible selon la revendication 1 ou 2, caractérisé en ce que lesdites particules polymères thermoplastiques ont une température de coagulation d'au moins 35 °C.
  4. Un élément formateur d'image thermosensible selon l'une quelconque des revendications 1 à 3, caractérisé en ce que les particules polymères thermoplastiques sont choisies dans le groupe constitué par le poly(éthylène), le poly(styrène), le poly((méth)acrylate de méthyle), le poly((méth)acrylate d'éthyle), le poly(chlorure de vinyle), le poly(chlorure de vinylidène), le poly(acrylonitrile) et le poly(vinylcarbazole) et leurs copolymères.
  5. Un élément formateur d'image thermosensible selon l'une quelconque des revendications 1 à 4, caractérisé en ce que ledit composé capable de convertir la lumière en chaleur est choisi dans le groupe constitué par un colorant absorbant la lumière infrarouge, le noir de carbone, un borure de métal, un carbure de métal, un nitrure de métal, un carbonitrure de métal et une dispersion polymère conductrice.
  6. Un élément formateur d'image thermosensible selon l'une quelconque des revendications 1 à 5, caractérisé en ce que la base lithographique est de l'aluminium anodisé ou comprend un support flexible sur lequel se trouve une couche hydrophile réticulée.
  7. Un élément formateur d'image thermosensible selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la couche formatrice d'image comprend un réticulant.
  8. Un élément formateur d'image thermosensible selon l'une quelconque des revendications 1 à 7, caractérisé en ce que ledit composé capable de convertir la lumière en chaleur est présent dans ladite couche formatrice d'image.
  9. Un procédé pour obtenir une plaque d'impression lithographique comprenant les phases consistant à :
    (a) exposer en forme d'image ou d'informations à la lumière ou la chaleur un élément formateur d'image selon l'une quelconque des revendications 1 à 8.
    (b) développer ledit élément formateur d'image exposé avec une solution de développement alcaline aqueuse afin d'éliminer les zones non exposées, formant ainsi une plaque d'impression lithographique.
  10. Un procédé pour obtenir une plaque lithographique selon la revendication 9, caractérisé en ce que ledit élément formateur d'image exposé et développé est cuit à une température entre 100 °C et 230 °C pendant une période de 40 min à 5 min.
EP19970200832 1996-04-09 1997-03-20 Elément d'enregistrement thermosensible et procédé pour la fabrication de plaques lithographiques utilisant cet élément Expired - Lifetime EP0800928B1 (fr)

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EP19970200832 EP0800928B1 (fr) 1996-04-09 1997-03-20 Elément d'enregistrement thermosensible et procédé pour la fabrication de plaques lithographiques utilisant cet élément

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Application Number Priority Date Filing Date Title
EP96200972 1996-04-09
EP96200972 1996-04-09
EP19970200832 EP0800928B1 (fr) 1996-04-09 1997-03-20 Elément d'enregistrement thermosensible et procédé pour la fabrication de plaques lithographiques utilisant cet élément

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EP0800928A1 EP0800928A1 (fr) 1997-10-15
EP0800928B1 true EP0800928B1 (fr) 1999-07-28

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EP0864420B2 (fr) * 1997-03-11 2005-11-16 Agfa-Gevaert Elément d'enregistrement de l'image pour la fabrication de plaques lithographiques positives
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
EP1038667B1 (fr) * 1999-03-25 2005-07-27 Dainippon Ink And Chemicals, Inc. Plaque d'impression lithographique et procédé de formation d'image
US6558787B1 (en) 1999-12-27 2003-05-06 Kodak Polychrome Graphics Llc Relation to manufacture of masks and electronic parts
EP1344644B1 (fr) * 2002-03-13 2007-07-25 FUJIFILM Corporation Précurseur pour plaque d'impression lithographique
US7358032B2 (en) 2002-11-08 2008-04-15 Fujifilm Corporation Planographic printing plate precursor
JP2004226472A (ja) * 2003-01-20 2004-08-12 Fuji Photo Film Co Ltd 平版印刷版原版
US7348126B2 (en) 2004-04-27 2008-03-25 Agfa Graphics N.V. Negative working, heat-sensitive lithographic printing plate precursor
US7354696B2 (en) 2004-07-08 2008-04-08 Agfa Graphics Nv Method for making a lithographic printing plate
US7195861B2 (en) 2004-07-08 2007-03-27 Agfa-Gevaert Method for making a negative working, heat-sensitive lithographic printing plate precursor
US7425405B2 (en) 2004-07-08 2008-09-16 Agfa Graphics, N.V. Method for making a lithographic printing plate
JP4458984B2 (ja) * 2004-08-16 2010-04-28 富士フイルム株式会社 平版印刷版原版

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