EP0649757B1 - Wärmeempfindliches Aufzeichnungsmaterial und Bildaufzeichnungsverfahren, das dieses Material verwendet - Google Patents

Wärmeempfindliches Aufzeichnungsmaterial und Bildaufzeichnungsverfahren, das dieses Material verwendet Download PDF

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Publication number
EP0649757B1
EP0649757B1 EP19940202810 EP94202810A EP0649757B1 EP 0649757 B1 EP0649757 B1 EP 0649757B1 EP 19940202810 EP19940202810 EP 19940202810 EP 94202810 A EP94202810 A EP 94202810A EP 0649757 B1 EP0649757 B1 EP 0649757B1
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EP
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Prior art keywords
recording material
layer
heat
heat mode
recording layer
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EP19940202810
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English (en)
French (fr)
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EP0649757A1 (de
Inventor
Yves C/O Agfa-Gevaert Nv Verburgh
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Agfa Gevaert NV
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Agfa Gevaert NV
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Classifications

    • 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
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/42—Intermediate, backcoat, or covering layers
    • B41M5/44—Intermediate, backcoat, or covering layers characterised by the macromolecular compounds
    • 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
    • B41M5/382—Contact thermal transfer or sublimation processes
    • B41M5/38207—Contact thermal transfer or sublimation processes characterised by aspects not provided for in groups B41M5/385 - B41M5/395
    • B41M5/38214—Structural details, e.g. multilayer systems
    • 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
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/46—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography characterised by the light-to-heat converting means; characterised by the heat or radiation filtering or absorbing means or layers
    • 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
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/41—Base layers supports or substrates
    • 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
    • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • B41M5/46—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography characterised by the light-to-heat converting means; characterised by the heat or radiation filtering or absorbing means or layers
    • B41M5/465—Infrared radiation-absorbing materials, e.g. dyes, metals, silicates, C black

Definitions

  • the present invention relates to a heat mode recording material and to a method for making images therewith. More in particular the present invention relates to an improvement of the quality, i.e. a low minimum density, of an image obtained with a heat mode recording material so that these images can be used as masks in a printing plate making process.
  • contact originals are prepared containing text and graphics. These originals are then used for imaging a printing plate.
  • Such contact originals can be made by manually preparing a paste-up or they can be prepared by the aid of a computer. In the latter case the computer may control an output device, generally a laser, for imaging a recording material.
  • a particular desirable recording material for imaging a printing plate contains the image on a transparent support allowing the printing plate to be exposed through the support of the recording material.
  • the minimum density, i.e. the density at the non-image areas, of the image on the recording material is extremely low.
  • the minimum density of the image used as a mask for exposing the printing plate is below 0.05.
  • a commonly used recording material is a silver halide photographic material that offers such advantages as high sensitivity, high density and good resolving power.
  • a silver halide photographic material requires special liquids for processing and as a consequence a lot of chemical waste is produced. Further silver halide photographic materials are susceptible to ambient light thus requiring handling in the dark.
  • Heat mode recording materials are heat mode recording materials because they are generally not susceptible to ambient light and can thus be handled in day light.
  • Heat mode recording materials are disclosed in e.g. US-P-4.123.309, US-P-4.123.578, US-P-4.157.412, US-P-4.547.456 and PCT application WO 88/04237.
  • the latter application discloses a web having an image forming surface and a porous layer of an image forming substance.
  • the element further comprises a heat sensitive substance.
  • the image forming surface Upon imaging with a laser the image forming surface is liquefied at the exposed parts thereby penetrating the porous layer and improving its adherence to the web while at the non-exposed parts liquefying of the image forming surface does not take place and as a consequence the adherence of the porous layer to the web remains poor.
  • the porous layer can then be removed in the non-exposed areas using a stripping tape or by simply rubbing. Due to the subtle balance of adhesion forces between the porous layer and the image forming surface and the cohesive forces within the porous layer the removal of the porous layer with a stripping tape has to be performed under very stringent conditions and even then lateral cracks of the porous layer in the exposed parts may occur resulting in a decreased image density.
  • the resulting image may be scratch sensitive and a protective layer should be laminated thereto which is inconvenient.
  • GB-A-2.029.267 discloses a heat mode recording material comprising on a support a metallic recording layer and a protective surface layer. Upon imaging with a laser the density of the metallic recording layer is reduced at the exposed areas due to melting of the metallic layer in these areas. Such a recording material is however unsuitable for imaging a printing plate because of the poor contrast and high fogging level of the image that is obtained
  • WO 92/06410 discloses a heat mode recording material that comprises a support substrate (i), at least one intermediate "dynamic release layer” (ii) essentially coextensive therewith and an imaging radiation-ablative carrier topcoat (iii) also essentially coextensive therewith, said imaging radiation-ablative carrier topcoat (iii) including an imaging amount of a contrast imaging material contained therein, and said at least one dynamic release layer (ii) absorbing such imaging radiation at a rate sufficient to effect the imagewise ablation mass transfer of at least said carrier topcoat (iii).
  • a heat mode recording material comprising on a transparent support a recording layer containing a light to heat converting substance, an image forming substance and a binder characterised in that there is present a heat decomposable intermediate layer between said transparent support and said recording layer and said heat decomposable intermediate layer being hardened and contiguous to said recording layer.
  • a method for making an image comprising image-wise exposing a heat mode recording material as defined above to light and rubbing the heat mode recording material to remove the recording layer in the exposed areas.
  • heat decomposable in connection with the present invention is meant that the intermediate layer at least partially decomposes and/or that the adhesion of the recording layer to the intermediate layer is reduced at the exposed areas.
  • thermoelectric layer in accordance with the present invention there can be used any polymeric layer that is readily decomposable at the temperature generated in the heat mode recording material.
  • the temperature generated in the heat mode recording material may reach 300°C to 800°C. It will furthermore be clear that the decomposition of the intermediate layer may not yield colored reaction products remaining on the heat mode recording material after rubbing.
  • a particular suitable polymer for use in the heat decomposable intermediate layer is an auto-oxidising polymer such as nitro-cellulose. It is furthermore essential to harden the intermediate layer.
  • a layer containing a hardened nitro-cellulose there is used a layer containing a hardened nitro-cellulose. Hardening of nitro-cellulose may be accomplished by means of an aromatic or aliphatic polyisocyanate, the latter being preferred.
  • the recording layer according to the present invention comprises a light to heat converting substance and an image forming substance.
  • the image forming substance and light to heat converting substance are the same substance.
  • the light to heat converting substance in connection with the present invention is a compound that is capable of absorbing a substantial amount of the exposure radiation and subsequently releasing the associate energy mainly in the form of heat.
  • the thickness of the heat mode recording layer is not more than 2.5 ⁇ m and most preferably not more than 1.5 ⁇ m. When the thickness of the recording layer becomes too large not all of the recording layer can be removed in the exposed areas so that a high fogging level results.
  • Suitable light to heat converting substances are e.g. carbon black, metals or metal alloys preferably having a low melting point and low conductivity e.g. Bi, Ge, Sn, Te etc., infrared or near infrared dyes as disclosed in e.g. US-4833124, EP-321923, US-4772583, US-4942141, US-4948776, US-4948777, US-4948778, US-4950639, US-4950640, US-4912083, US-4952552, US-5024990, US-5023229 etc. or infrared absorbing pigments such as e.g. HEUCODORTM metal oxide pigments available from Heubach Langelsheim.
  • Suitable image forming substances to be used in accordance with the invention are substances that can yield sufficient density in the desired range of the spectrum, e.g. in the visual or in the UV part of the spectrum.
  • image forming substances are e.g. dyes or dye pigments.
  • the image forming substance and light to heat converting substance are the same substance.
  • Compounds that can be used as image forming substance and light to heat converting substance are e.g. carbon black or metals.
  • the recording layer is a layer containing carbon black and a polymeric binder preferably having a good thermal degradation.
  • binders that can be used are e.g. gelatin, cellulose, cellulose esters e.g. cellulose acetate, nitrocellulose, polyvinyl alcohol, polyvinyl pyrrolidone, a copolymer of vinylidene chloride and acrylonitrile, poly(meth)acrylates, polyvinyl chloride, silicone resin etc.
  • the recording layer may further contain other ingredients such as e.g. wetting agents, matting agents, anti-oxidizing agents etc..
  • the recording layer is preferably covered with a surface layer.
  • a corresponding image-wise heat pattern will be formed in the recording layer due to the conversion of the radiation into heat by the light to heat converting substance.
  • This heat pattern will cause image-wise decomposition of the recording layer and optionally of the surface layer that may be on top thereof.
  • the recording layer will be sufficiently decomposed so that the recording layer and optional surface layer can be easily removed at these parts by simply rubbing the recording material.
  • the optional surface layer may also be decomposed due to the heat generated at the exposed parts, however this is not a requirement because the decomposition of the recording layer at the exposed parts can be sufficient to also remove the surface layer by rubbing.
  • the optional surface layer on top of the recording layer offers the advantage that no or little decrease of the density in the non-exposed parts occurs during rubbing which may otherwise occur as a consequence of possible damaging of the recording layer during rubbing.
  • the optional surface layer in accordance with the present invention preferably also contains a polymer that shows good thermal degradation.
  • polymers that can be used in the surface layer are e.g. gelatin, cellulose, cellulose eaters e.g. cellulose acetate, nitrocellulose, polyvinyl alcohol, polyvinyl pyrrolidone, a copolymer of vinylidene chloride and acrylonitrile, poly(meth)acrylates, polyvinyl chloride, a copolymer of styrene and butadiene, silicone resins etc...
  • silicone resins are hardened silicone resins.
  • the silicone resin contains one or more components one of which is generally a linear silicone polymer terminated with a chemically reactive group at both ends and a multifunctional component as a hardening agent.
  • the silicone resin can be hardened by condensation curing, addition curing or radiation curing.
  • Condensation curing can be performed by using a hydroxy terminated polysiloxane that can be cured with a multifunctional silane.
  • Suitable silanes are e.g. acetoxy silanes, alkoxy silanes and silanes containing oxime functional groups.
  • the condensation curing is carried out in the presence of one or more catalyst such as e.g. tin salts or titanates.
  • hydroxy terminated polysiloxanes can be cured with a polyhydrosiloxane polymer in the presence of a catalyst e.g. dibutyltindiacetate.
  • Addition curing is based on the addition of Si-H to a double bond in the presence of a platinum catalyst.
  • Silicone coatings that can be cured according to the addition curing thus comprise a vinyl group containing polymer, a platinum catalyst e.g. chloroplatinic acid complexes and a polyhydrosiloxane e.g. polymethylhydrosiloxane.
  • Suitable vinyl group containing polymers are e.g. vinyldimethyl terminated polydimethylsiloxanes and dimethylsiloxane/vinylmethyl siloxane copolymers.
  • Radiation cure coatings that can be used in accordance with the present invention are e.g. U.V. curable coatings containing polysiloxane polymers containing epoxy groups or electron beam curable coatings containing polysiloxane polymers containing (meth)acrylate groups.
  • the latter coatings preferably also contain multifunctional (meth)acrylate monomers.
  • the surface layer may contain additional substances such as plasticizers, pigments, matting agents, anti-statica etc.. Part of the light to heat converting substance may also be incorporated in the surface layer.
  • the thickness of the surface layer is preferably between 0.1 ⁇ m and 3 ⁇ m and more preferably between 0.1 ⁇ m and 1 ⁇ m.
  • the total thickness thereof is preferably kept as low as possible.
  • the layer thickness at a low level the imaged parts of the recording material can be more easily removed and further the sharpness and resolution of the image can be improved in this way.
  • the total thickness will not exceed 7 ⁇ m and most preferably will not exceed 5 ⁇ m.
  • the heat mode recording material used in accordance with the invention may contain additional layers such as e.g. one or more layers between the support and the heat decomposable intermediate layer for improving the adhesion thereof to the support.
  • a further image forming layer on top of the recording layer in order to increase the density of the image.
  • a particularly suitable layer for this purpose is a vapour deposited metal layer such e.g. a layer of bismuth, silver, aluminium etc...
  • a peelable polymeric film may be provided on top of the recording layer or on top of the surface layer when present.
  • Such polymeric film avoids contamination of the exposure device by parts of the recording material that may otherwise be ablated during exposure.
  • the polymeric film is removed after an image has been formed on the recording material.
  • the polymeric film further avoids the occurence of electric discharges when taking a recording material out of a pile. To further reduce such discharge the peelable polymeric film may be given an antistatic treatment.
  • Suitable polymeric films for use in accordance with the present invention are e.g. polyester, polycarbonate or polystyrene film, cellulose derivatives, polyolefines, polyvinylchloride, etc.
  • the peelable polymeric film is metallized or it may be a polymeric film being pigmented with a conductive pigment such as e.g. carbon black, a metal or metal oxide etc..
  • the peelable polymeric film has a thickness between 3 ⁇ m and 100 ⁇ m and more preferably between 10 ⁇ m and 50 ⁇ m.
  • a thin peelable polymeric film offers the advantage that it can be laminated to the recording material without the aid of an adhesive and that it can be easily removed afterwards.
  • the peelable polymeric film in connection with the present invention may also be laminated to the recording material using an adhesive provided the adhesive does not cause adverse effects on the imaging properties of the recording material or damage when peeled off.
  • Suitable transparent supports for the heat mode recording material used in connection with present invention are e.g. a polyester film support, polycarbonate film, polystyrene film etc..
  • the thickness of the support is preferably between 0.1mm and 0.35mm.
  • the heat mode recording material is image-wise exposed to light, preferably through the support of the recording material and subsequently rubbed to remove the recording layer and optional surface layer at the exposed parts.
  • the exposure is preferably accomplished using a laser.
  • lasers are e.g. semiconductor lasers, YAG lasers e.g. Nd-YAG lasers, Argon lasers etc..
  • the laser may have a power output between 40 and 7500mW and preferably operates in the infrared part of the spectrum.
  • Rubbing in connection with the present invention is preferably carried in two steps.
  • the recording material may be rubbed e.g. by means of a brush under essentially dry conditions, without the aid of a liquid, to remove the exposed areas.
  • a liquid that does not swell the recording layer may be used to take away any residual dust that may still be present.
  • a particular suitable liquid for this purpose in case the recording layer and/or the surface layer is hydrophobic is water optionally containing a detergent.
  • the image obtained according to the above described method can be used as an original for imaging a lithographic printing plate.
  • a lithographic printing plate precursor containing an oleophobic or oleophilic base is imaged using as an original an image obtainable by the above described method so that an image-wise pattern of respectively oleophilic or oleophobic parts is formed on the oleophobic or oleophilic background. Exposure may take place through the support of the imaged recording material being in contact with the lithographic printing plate precursor.
  • a plate precursor containing an aluminium support carrying on a hydrophilic (oleophobic) surface a photosensitive coating of e.g. a photopolymerizable composition or a diazo resin etc. is exposed to actinic radiation in contact with an imaged heat mode recording material of the present invention and is subsequently developed so that an image-wise pattern of oleophilic parts remains on the oleophobic background.
  • a photosensitive coating e.g. a photopolymerizable composition or a diazo resin etc.
  • a silver salt diffusion transfer plate precursor containing a silver halide photosensitive layer and an image receiving layer is camera or contact exposed using an imaged heat mode recording material of the present invention and is subsequently developed according to the silver salt diffusion transfer process.
  • Such type of printing plate precursors are described in e.g. EP-A-410500, EP-A-474922, US-P-4297429.
  • E510TM is a medium molecular nitrocellulose, supplier Wolff Walsode Co.
  • Special SchwarzTM250 is a carbon black from Degussa
  • SolsperseTM24000 is a wetting agent from ICI
  • SolsperseTM 5000 is a wetting agent from ICI
  • the recording layer was applied at a dry coating weight of about 1.5 g/m2, corresponding to an optical density of about 3.0.
  • ExxsolTMDSP 80/110 (tradename) is a nahptha i.e. mixture of paraffins and in which the content of aromatics has been reduced, supplier Exxon Chemicals.
  • PS 255 (tradename) is a poly (dimethylsiloxane/methylvinylsiloxane) copolymer, gum, from Huls.
  • PS 447.6 (tradename) is a vinyldimethyl terminated polydimethylsiloxane with a viscosity of 65,000 ctsk., molecular weight about 119,000 from Huls (8)
  • Syl-OffTM7367 (tradename) is the cross-linker used and is a solution of 71% of methyl hydrogen polysiloxane in ethynylcyclohexene, from Dow Corning (9)
  • PC 072 (tradename) is a divinyltetramethyl disiloxane complex of platinum in xylene, supplier Huls.
  • the surface layer coating composition was coated on the recording layer to a dry coating weight of 2.0 g/m2 to obtain an oleophobic top layer. Subsequent the surface layer was cured for 300 s (5 min.) at 130°C.
  • the thus prepared heat mode recording material was image-wise exposed through the support with a Nd-YLF laser (1053nm) at a linear writing speed of 32.8 m/s, with a spot diameter of (1/e2) and a power output at the surface of the recording material of 1600 mW.
  • the recording layer together with the surface layer were image-wise removed by rubbing with a dry cotton pad.
  • the obtained image portions were post-cleaned with a cotton pad wetted with a 1% aqueous dilution of a commercial detergent.
  • the image portions showed a residual optical density of 0.05.
  • a base coat layer according following composition: 100 g n-butanone 10.0 g nitrocellulose E510TM (1) 6.7 g DesmodurTMN75 (10) 0.3 g SiccatolTMZN12 (11) (10) DesmodurTMN75 (tradename) is an aliphatic polyisocyanate crosslinking agent solution (75% solids) recommend for application in clear non yellowing coatings, supplier Bayer. (11) SiccatolTMZN12 (tradename) is a 12% Zn-octanoate solution (catalyst) supplied by Akzo.
  • the base coat was applied to a dry coating weight about 1.0 g/m2 and cured for 10 min. at 120°C.
  • the coating composition from example 1 for the recording layer was then coated to obtain a coating showing an optical density of 3.7.
  • To the recording layer was then coated the composition for the surface layer described in example 1 to a dry coating weight of about 2.0 g/m2. Subsequent the surface layer was cured for 300 s (5 min.) at 130°C.
  • the thus prepared heat mode recording material was image-wise exposed through the backside with a Nd-YLF laser (1053nm) at a linear writing speed of 32.8 m/s, with a spot diameter of (1/e2) and a power output at the surface of the recording material of 1600 mW.
  • the recording layer together with the surface layer were image-wise removed by rubbing with a dry cotton pad.
  • the obtained image portions were post-cleaned with a cotton pad wetted with a 1% dilution of a commercial detergent.
  • the image portions showed a very low residual optical density of 0.02. (measured with a McBethTMTR924 - visible light densitometer) towards the uncoated polyester base taken as reference.
  • TegoglideTM410 (tradename) is an alkylene siloxane blockcopolymer coating additive from Goldsmith. In the application from example 4 it increases the slip properties of the recording layer together with an enhancement of the scratch resistance.
  • the thus prepared heat mode recording material was image-wise exposed through the backside with a Nd-YLF laser (1053nm) at a linear writing speed of 32.8 m/s, with a spot diameter of (1/e2) and a power output at plate level of 1600 mW. After imaging the recording layer was image wise removed by rubbing with a dry cotton pad. The obtained image portions were post-cleaned with a cotton pad wetted with a 1% aqueous dilution of a commercial detergent.
  • the image portions showed a very low residual optical density of 0.02.
  • the composition for the surface layer described in example 1 was then coated to a dry coating weight of about 2.0 g/m2. Subsequent the surface layer was cured for 300 s (5 min.) at 130°C.
  • the thus prepared heat mode recording material was image-wise exposed through the backside with a Nd-YLF laser (1053 nm) at a linear writing speed of 32.8 m/s, with a spot diameter of (1/e2) and a power output at the surface of the heat mode recording material of 1600 mW.
  • the recording layer together with the metallic layer and the surface layer were image-wise removed by rubbing with a dry cotton pad.
  • the obtained image portions were post-cleaned with a cotton pad wetted with a 1% aqueous dilution of a commercial detergent.
  • the image portions showed a very low residual optical density of 0.01.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Claims (10)

  1. Ein wärmeempfindliches Aufzeichnungsmaterial, das auf einem transparenten Träger eine Aufzeichnungsschicht mit einer Licht in Wärme umwandelnden Substanz, einer bilderzeugenden Substanz und einem Bindemittel enthält, dadurch gekennzeichnet, daß zwischen dem transparenten Träger und der Aufzeichnungsschicht eine wärmezersetzbare, gehärtete, an die Aufzeichnungsschicht grenzende Zwischenschicht angeordnet ist.
  2. Wärmeempfindliches Aufzeichnungsmaterial nach Anspruch 1, dadurch gekennzeichnet, daß die wärmezersetzbare Zwischenschicht Nitrocellulose enthält.
  3. Wärmeempfindliches Aufzeichnungsmaterial nach Anspruch 2, dadurch gekennzeichnet, daß die Nitrocellulose mit einem Polyisocyanat gehärtet ist.
  4. Wärmeempfindliches Aufzeichnungsmaterial nach irgendeinem der vorstehenden Ansprüche, das auf der Aufzeichnungsschicht weiterhin eine Oberflächenschicht enthält.
  5. Wärmeempfindliches Aufzeichnungsmaterial nach irgendeinem der vorstehenden Ansprüche, dadurch gekennzeichnet, daß die Licht in Wärme umwandelnde Substanz und die bilderzeugende Substanz dieselbe Substanz sind.
  6. Wärmeempfindliches Aufzeichnungsmaterial nach Anspruch 5, dadurch gekennzeichnet, daß die Licht in Wärme umwandelnde Substanz und die bilderzeugende Substanz Gasruß sind.
  7. Ein Bildaufzeichnungsverfahren, in dem ein wärmeempfindliches Aufzeichnungsmaterial, das auf einem transparenten Träger eine Aufzeichnungsschicht mit einer Licht in Wärme umwandelnden Substanz, einer bilderzeugenden Substanz und einem Bindemittel enthält und in dem zwischen dem transparenten Träger und der Aufzeichnungsschicht eine wärmezersetzbare, gehärtete, an die Aufzeichnungsschicht grenzende Zwischenschicht angeordnet ist, bildmäßig belichtet und die Aufzeichnungsschicht an den belichteten Bereichen vom Aufzeichnungsmaterial abgerieben wird.
  8. Ein Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß der Abreibvorgang aus zwei aufeinanderfolgenden Stufen besteht, wobei in einer ersten Stufe unter wesentlich trockenen Bedingungen und in einer zweiten Stufe mit einer die Aufzeichnungsschicht nicht schwellenden Flüssigkeit über dem wärmeempfindlichen Aufzeichnungsmaterial gerieben wird.
  9. Ein Verfahren nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß das wärmeempfindliche Aufzeichnungsmaterial durch seinen Träger belichtet wird.
  10. Ein Verfahren nach irgendeinem der Ansprüche 7 bis 9, dadurch gekennzeichnet, daß die Zwischenschicht gehärtet ist.
EP19940202810 1993-10-25 1994-09-29 Wärmeempfindliches Aufzeichnungsmaterial und Bildaufzeichnungsverfahren, das dieses Material verwendet Expired - Lifetime EP0649757B1 (de)

Priority Applications (1)

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EP19940202810 EP0649757B1 (de) 1993-10-25 1994-09-29 Wärmeempfindliches Aufzeichnungsmaterial und Bildaufzeichnungsverfahren, das dieses Material verwendet

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP93202973 1993-10-25
EP93202973 1993-10-25
EP19940202810 EP0649757B1 (de) 1993-10-25 1994-09-29 Wärmeempfindliches Aufzeichnungsmaterial und Bildaufzeichnungsverfahren, das dieses Material verwendet

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EP0649757A1 EP0649757A1 (de) 1995-04-26
EP0649757B1 true EP0649757B1 (de) 1996-12-11

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Publication number Priority date Publication date Assignee Title
US5766819A (en) * 1995-11-29 1998-06-16 E. I. Dupont De Nemours And Company Donor elements, assemblages, and associated processes with flexible ejection layer(s) for laser-induced thermal transfer
JP3789569B2 (ja) * 1996-10-02 2006-06-28 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
US6143451A (en) * 1996-11-26 2000-11-07 E. I. Du Pont De Nemours And Company Imaged laserable assemblages and associated processes with high speed and durable image-transfer characteristics for laser-induced thermal transfer
US5840463A (en) * 1997-07-14 1998-11-24 E. I. Du Pont De Nemours And Company Photosensitive donor element assemblages and associated process for laser-induced thermal transfer

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5546988A (en) * 1978-09-29 1980-04-02 Fuji Photo Film Co Ltd Thermal recording material
JPS597948A (ja) * 1982-07-06 1984-01-17 Asahi Chem Ind Co Ltd 画像形成方法
US5171650A (en) * 1990-10-04 1992-12-15 Graphics Technology International, Inc. Ablation-transfer imaging/recording
DE69217065T2 (de) * 1991-08-16 1997-05-22 Du Pont Durch infrarot direktbeschreibbare aufzeichnungsmaterialien
JPH0558045A (ja) * 1991-08-29 1993-03-09 I C I Japan Kk 熱溶融転写カラーインクシート

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