EP0775594A1 - Verfahren zur fehlerfreien Herstellung eines Bildes nach dem Wärmeverfahren - Google Patents

Verfahren zur fehlerfreien Herstellung eines Bildes nach dem Wärmeverfahren Download PDF

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Publication number
EP0775594A1
EP0775594A1 EP95203208A EP95203208A EP0775594A1 EP 0775594 A1 EP0775594 A1 EP 0775594A1 EP 95203208 A EP95203208 A EP 95203208A EP 95203208 A EP95203208 A EP 95203208A EP 0775594 A1 EP0775594 A1 EP 0775594A1
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EP
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Prior art keywords
layer
image forming
exposure
heat mode
image
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EP95203208A
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English (en)
French (fr)
Inventor
Rudolf c/o Agfa-Gevaert N.V. van den Bergh
Johan c/o Agfa-Gevaert N.V. Lamotte
Luc C/O Agfa-Gevaert N.V. Leenders
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Agfa Gevaert NV
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Agfa Gevaert NV
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Priority to EP95203208A priority Critical patent/EP0775594A1/de
Publication of EP0775594A1 publication Critical patent/EP0775594A1/de
Withdrawn legal-status Critical Current

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    • 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
    • B41M5/48—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 combined with other image registration layers or compositions; Special originals for reproduction by thermography
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/494—Silver salt compositions other than silver halide emulsions; Photothermographic systems ; Thermographic systems using noble metal compounds
    • G03C1/498—Photothermographic systems, e.g. dry silver
    • G03C1/4989—Photothermographic systems, e.g. dry silver characterised by a thermal imaging step, with or without exposure to light, e.g. with a thermal head, using a laser

Definitions

  • the present invention relates to a method for the formation of an improved heat mode image.
  • Conventional photographic materials based on silver halide are used for a large variety of applications. For instance, in the pre-press sector of graphic arts rather sensitive camera materials are used for obtaining screened images. Scan films are used for producing colour separations from multicolour originals.
  • Phototype setting materials record the information fed to phototype- and image setters. Relative insensitive photographic materials serve as duplicating materials usually in a contact exposure process. Other fields include materials for medical recording, duplicating and hard copy, X-ray materials for non-destructive testing, black-and-white and colour materials for amateur- and professional still photography and materials for cinematographic recording and printing.
  • Silver halide materials have the advantage of high potential intrinsic sensitivity and excellent image quality. On the other hand they show the drawback of requiring several wet processing steps employing chemical ingredients which are suspect from an ecological point of view.
  • a dry imaging system known since quite a while is 3M's dry silver technology. It is a catalytic process which couples the light-capturing capability of silver halide to the image-forming capability of organic silver salts.
  • Non-conventional materials as alternative for silver halide is based on photopolymerisation.
  • photopolymerizable compositions for the production of images by information-wise exposure thereof to actinic radiation is known since quite a while. All these methods are based on the principle of introducing a differentiation in properties between the exposed and non-exposed parts of the photopolymerizable composition e.g. a difference in solubility, adhesion, conductivity, refractive index, tackiness, permeability, diffusibility of incorporated substances e.g. dyes etc..
  • thermographic materials When the heat pattern is applied directly by means of a thermal head such elements are called thermographic materials. When the heat pattern is applied by the transformation of intense laser light into heat these elements are called heat mode materials or thermal imaging media. They offer the advantage in addition to an ecological advantage that they do not need to be handled in a dark room nor is any other protection from ambient light needed.
  • Heat mode recording materials based on change of adhesion, 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 publ. Nos.
  • such a thermal imaging medium comprises a transparent support and an imaging layer containing carbon black, optionally additional layers and a stripping sheet.
  • Transparent polymeric resin supports such as polyethylene terephthalate supports tend to contain microscopic dust particles, or catalyst rest particles, or microscopic voids (so-called fish-eyes) which scatter the incoming laser beam so that it does not reach the radiation sensitive layer anymore at the proper location.
  • microscopic dust particles or catalyst rest particles, or microscopic voids (so-called fish-eyes) which scatter the incoming laser beam so that it does not reach the radiation sensitive layer anymore at the proper location.
  • pinholes in negative working systems it causes the formation of so-called pinpoints.
  • the same phenomenon is caused by the presence of dust or scratches on the surface of the support or in the optionally present subbing layer.
  • negative working heat mode systems bases on change of adhesion as described above, the pinholes become apparent after the delamination step.
  • the defect is most disturbing in recorded full areas, where the pinholes appear as tiny white spots on a black background, and less in recorded separate lines and dots.
  • these pinholes depending on their size are hardly disturbing for practical applications of the finished image, e.g. as a master for the exposure of a printing plate or of a duplicating material, they give the image an unsatisfactory outlook, especially when inspected by means of a magnifying glass.
  • the objects of the present invention are realized by providing a method for the formation of a heat mode image comprising the following steps :
  • the objects of the present invention are realized by providing a method for the formation of a heat mode image comprising the following steps :
  • the pinhole defect is overcome by the density generated in layer (3) or (8').
  • the image forming substance is carbon black
  • the organic reducible metal salt is silver behenate
  • PET polyethylene terephthalate
  • other transparent polymeric resins e.g. polycarbonate, polyvinylchloride, polyethylene, polypropylene or polystyrene can be used.
  • the transparent support preferably PET
  • a subbing layer (2) is provided with a subbing layer (2).
  • An example of a suitable subbing layer is a layer containing a polymer containing covalently bound chlorine. Suitable chlorine containing polymers are e.g.
  • a preferred chlorine containing polymer is co(vinylidenechloride-methylacrylate-itaconic acid ; 88 % / 10 % : 2 %).
  • a most suitable subbing layer contains the latter polymer and a colloidal silica such as KIESELSOL 100F (Bayer AG).
  • Layer (3) or (8') contains as main ingredients a reducible metal salt, a reducing agent, a binder and optionally a toning agent.
  • the organic metal salt is an organic silver salt.
  • Substantially light-insensitive organic silver salts particularly suited for use according to the present invention in the photosensitive recording layer are silver salts of aliphatic carboxylic acids known as fatty acids, wherein the aliphatic carbon chain has preferably at least 12 C-atoms, e.g. silver laurate, silver palmitate, silver stearate, silver hydroxystearate, silver oleate and silver behenate.
  • Silver salts of modified aliphatic carboxylic acids with thioether group as described e.g. in GB-P 1,111,492 and other organic silver salts as described in GB-P 1,439,478, e.g. silver benzoate and silver phthalazinone, may be used likewise to produce a thermally developable silver image.
  • silver salts of aromatic carboxylic acids e.g.
  • benzoic acid phtalic acid, terephtalic acid, salicylic acid, m-nitrobenzoic-, phenylacetic-, pyromellitic-, p-phenylbenzoic-, camphoric-, huroic-, acetamidobenzoic- and o-aminobenzoic acid, etc.
  • silver salts of mercapto group- or thione group-containing compounds e.g., 3-mercapto-4-phenyl-1,2,4-triazole, 2-mercaptobenzimidazole, etc.
  • an imino group-containing compound e.g.
  • the organic silver salt is silver behenate.
  • the compound is colourless, stable toward visible light, insoluble in many volatile liquid vehicles, and moisture-resistant. It is produced in the desired physical form without difficulty and at reasonable cost.
  • reducible organic metal salts beside silver salts include e.g. iron(III) stearate, iron(III) rosinate, iron(III) laurate, nickel stearate, nickel rosinate, nickel acetate, nickel oleate, copper rosinate, copper acetate, cobalt stearate, cobalt acetate and zinc stearate.
  • a particular salt is often used in combination with a particular reducing agent in the donor element (see furtheron) in order to obtain optimal results.
  • the organic metal salt is preferably present in an amount between 1 and 20 mmole/m 2 .
  • Suitable reducing agents for use in layer (3) or (8') include pyrogallol; 4-azeloyl-bis-pyrogallol; 4-stearyl pyrogallol; galloacetophenone; di-tertiary-butyl pyrogallol; gallic acid anilide; methyl gallate, ethyl gallate; normal- and iso-propyl gallate; butyl gallate; dodecyl gallate; gallic acid; ammonium gallate; ethyl protocatechuate; cetyl protocatechuate; 2,5-dihydroxy benzoic acid, 1-hydroxy-2-naphthoic acid; 2-hydroxy, 3-naphthoic acid; phloroglucinol; catechol; 2,3-naphthalene diol; 4-lauroyl catechol; sodium gallate; protocatechualdehyde; 4-methyl esculetin; 3,4-dihydroxy benzoic acid; 2,3-dihydroxy benzo
  • reducing agents include resorcins, m-aminophenols, alkylphenols, alkoxynaphtols, m-phenylenediamines.
  • a further class of reducing agents is constituted by hydrazine compounds.
  • hydrazine compounds include p-tolylhydrazine hydrochloride, N,N-phenylformylhydrazide, acetohydrazide, benzoylhydrazide, p-toluenesulphonylhydrazide, N,N'-diacetylhydrazine, ⁇ -acetyl-phenylhydrazine, etc.
  • the reducing agents may be used in combination if desired.
  • Particular organic metal salts of the photosensitive element are often preferably used with particular reducing agents in order to optimize the reduction reaction.
  • Examples of such preferred "reaction pairs" can be found e.g. in US 3,722,406, col. 3, table 1.
  • the reducible metal salt is silver behenate
  • the reducing agent is preferably chosen from ethyl gallate or the butyl ester of 3,4-dihydroxy benzoic acid.
  • the recording layer contains in admixture with the organic metal salt and/or the reducing agent a so-called toning agent known from thermography or photo-thermography.
  • a so-called toning agent known from thermography or photo-thermography.
  • this toning agent is incorporated in the photosensitive element but in principle it can also be present in the donor element.
  • Suitable toning agents are the phthalimides and phthalazinones mentioned in US-P Re. 30,107. Further reference is made to the toning agents described in US-P 3,074,809, 3,446,648 and 3,844,797.
  • Other particularly useful toning agents are the heterocyclic toner compounds of the benzoxazine dione or naphthoxazine dione type within the scope of following general formula : wherein
  • a preferred toner compound is 3,4-dihydro-2,4-dioxo-1,3,2H-benzoxazine described in US-P 3,951,660.
  • organic solvent-soluble polymers e.g. polymers derived from ⁇ , ⁇ -ethylenically unsaturated compounds such as e.g. polymethyl methacrylate, polyvinyl chloride, a vinylidene chloride-vinyl chloride copolymer, polyvinyl acetate, a vinyl acetate-vinyl chloride copolymer, a vinylidene chloride-acrylonitrile copolymer, a styrene-acrylonitrile copolymer. chlorinated polyethylene, chlorinated polypropylene, a polyester, a polyamide, etc.
  • organic solvent-soluble polymers e.g. polymers derived from ⁇ , ⁇ -ethylenically unsaturated compounds such as e.g. polymethyl methacrylate, polyvinyl chloride, a vinylidene chloride-vinyl chloride copolymer, polyvinyl acetate, a vinyl acetate-vinyl chloride copolymer
  • polyvinylbutyral containing some vinyl alcohol units sold under the trade name BUTVAR by MONSANTO Co.
  • organic solvents can be used for dissolving and coating these polymers.
  • These polymer binders may be used either alone or in combination of two or more thereof. Also they can be combined with water-soluble binders, e.g. gelatin, polyvinyl alcohol, polyvinyl pyrrolidone, carboxymethyl cellulose, methyl cellulose, ethyl cellulose, gum arabic, casein, etc.
  • the above mentioned polymers or mixtures thereof forming the binder may be used in conjunction with waxes or "heat solvents” also called “thermal solvents” or “thermosolvents” improving the reaction speed of the redox-reaction at elevated temperature.
  • the image forming substance is preferably a pigment, e.g. a magnetic pigment, e.g. iron oxides, a coloured piment, e.g. copper phtalocyanine, or metal particles.
  • a pigment e.g. a magnetic pigment, e.g. iron oxides, a coloured piment, e.g. copper phtalocyanine, or metal particles.
  • the most preferred pigment is carbon black. It can be used in the amorphous or in the graphite form.
  • the preferred average particle size of the carbon black ranges from 0.01 to 1 ⁇ m. Different commercial types of carbon black can be used, preferably with a very fine average particle size, e.g.
  • the image forming substance and the compound transforming intense laser radiation into heat is one and the same product.
  • the image forming substance is another compound not absorptive for the laser radiation, which is preferably infra-red laser radiation
  • an extra compound, preferably an infrared absorbing compound is required for transforming the radiation into heat.
  • This infra-red absorbing compound can be a soluble infra-red absorbing dye or a dispersable infra-red absorbing pigment.
  • Infra-red absorbing compounds are known since a long time and can belong to several different chemical classes, e.g. indoaniline dyes, oxonol dyes, porphine derivatives, anthraquinone dyes, merostyryl dyes, pyrylium compounds and squarylium derivatives.
  • a suitable infra-red dye can be chosen from the numerous disclosures and patent applications in the field, e.g., from US-Patent No's 4,886,733, 5,075,205, 5,077,186, 5,153,112 5,244,771, from Japanese unexamined patent publications (Kokai) No.'s 01-253734, 01-253735, 01-253736, 01-293343, 01-234844, 02-3037, 02-4244, 02-127638, 01-227148, 02-165133, 02-110451, 02-234157, 02-223944, 02-108040, 02-259753, 02-187751, 02-68544, 02-167538, 02-201351, 02-201352, 03-23441, 03-10240, 03-10239, 03-13937, 03-96942, 03-217837, 03-135553, 03-235940, and from the European published patent applications publ.
  • binders for the image forming layer gelatin polyvinylpyrrolidone, polyvinylalcohol, hydroxyethylcellulose, polyethyleneoxide and a broad variety of polymer latices can be considered. These latices can be film forming or non-film forming. They can comprise acid groups as a result of which they can swell in an alkaline coating medium and/or become totally or partially soluble. In this way the layer properties can be strongly influenced, e.g. less coating and drying point defects will appear. When choosing a particular type of carbon black and a particular type of polymeric binder the ratio of the amounts of both has to be optimized for each case.
  • Preferred binders are copolymers of ethylacrylate, methylacrylate and methacrylic acid.
  • the thickness of the image forming layer is preferably comprised between 0.5 and 1.5 micron.
  • the release layer contains a binder and one or more of the typical ingredients for release layers known in the art such as waxes, polyethylene, silicones, fluorated polymers such as Teflon, silica particles (e.g. SEAHOSTAR KE types, Nippon Shokukai Co), colloidal silica, polymeric beads (e.g. polystyrene, polymethylmethacrylate), hollow polymeric core/sheat beads (e.g. ROPAQUE particles, Rohm and Haas Co), beads of siliconised pigments like siliconised silica (e.g. TOSPEARL types, Toshiba Silicones Co), and matting agents.
  • the release layer contains a mixture of polyethylene and a per(fluoroethylene) compound (Teflon). The preferred coverage of the release layer ranges between 0.1 and 3 g/m 2 .
  • the thermal adhesive layer (6) or (4') contains one or more thermoadhesive polymers having a glass transition temperature T g preferably comprised between 20 and 60 °C.
  • T g glass transition temperature
  • the polymers are preferably incorporated as latices.
  • Other additives can be present into the TAL to improve the layer formation or the layer properties, e.g. thickening agents, surfactants, levelling agents, thermal solvents and pigments.
  • Preferred latices are styrene-butadiene latices. These latices can contain other comonomers which improve the stablitity of the latex, such as acrylic acid, methacrylic acid and acrylamide.
  • Other possible polymer latices include polyvinylacetate, copoly(ethylene-vinylacetate), copoly(acrylonitrile-butadiene-acrylic acid), copoly(styrene-butylacrylate), copoly(methylmethacrylate-butadiene), copoly(methylmethacrylate-butylmethacrylate), copoly(methylmethacrylate-ethylacrylate), copolyester(terephtalic acid-sulphoisophtalic acid-ethyleneglycol), copolyester(terephtalic acid-sulphoisophtalic acid-hexanediol-ethyleneglycol).
  • Particularly suitable polymers for use in the TAL layer are the BAYSTAL polymer types, marketed by Bayer AG, which are on the basis of styrene-butadiene copolymers. Different types with different physical properties are available. The styrene content varies between 40 and 80 weight %, while the amount of butadiene varies between 60 and 20 weight % ; optionally a few weight % (up to about 10 %) of acrylamide and/or acrylic acid can be present. Most suited are e.g. BAYSTAL KA 8558, BAYSTAL KA 8522, BAYSTAL S30R and BAYSTAL P1800 because they are not sticky at room temperature when used in a TAL layer. Other useful polymers are the EUDERM polymers, also from Bayer AG, which are copolymers comprising n.-butylacrylate, methylmethacrylate, acrylonitrile and small amounts of methacrylic acid.
  • the TAL can be coated on a separate temporary support. In that case the TAL is laminated to the release layer and then the temporary support is removed by delamination.
  • the release layer can contain a thermoadhesive polymer.
  • the stripping sheet can be laminated to the thermoadhesive layer after or before laser exposure.
  • the stripping sheet self-evidently must be transparent to the laser radiation.
  • This transparent stripping sheet can be composed of any of the same polymeric resins suitable for use as support.
  • a polyethylene terephthalate sheet is preferred. Its thickness if preferably comprised between 10 and 200 ⁇ m. Preferably it is somewhat thinner than the support for ecological reasons.
  • the stripping sheet can also be an opaque sheet such as a paper base, e.g. a plain paper base or a polyethylene coated paper.
  • the reducible metal salt layer is incorporated directly into the medium.
  • the original layer arrangement and the status after processing are illustrated in fig. 1(I) and fig. 1(II), respectively.
  • Following layer arrangement is provided, in order : support (1), subbing layer (2), reducible metal salt layer (3), image forming layer (4), release layer (5) and thermoadhesive layer (6).
  • support (1) subbing layer (2), reducible metal salt layer (3), image forming layer (4), release layer (5) and thermoadhesive layer (6).
  • a negative heat mode image is obtained comprising at least part of layer (5) and the layers (4), (3) and (2) which all adhere to the original support (1).
  • delamination layer (4) shows a lot of pinholes (see vertical white bars in fig. 1(II)).
  • An overall exposure to active radiation is applied to the negative image.
  • active radiation is meant radiation that according to its nature and intensity is capable of generating sufficient beat in the recorded full areas.
  • This overall exposure can be a lamp exposure, preferably an infra-red lamp exposure, but, most preferably, it is simply a scanning-wise exposure by the same laser as used for the information-wise exposure. Due to lateral spread of the heat generated and to its partial diffusion in layer (3) chemical reduction is induced in this layer (3). The density obtained, though be it a small one, is sufficient to fill up the white pinhole spots so that they are no longer visible. On a recorded isolated line or dot the generation and diffusion of heat is too insignificant to cause a broadening of that line or dot.
  • a thin polymeric film forming layer (3bis) is incorporated between layer (3) and layer (4).
  • layer (4) is locked to layer (3bis) in the exposed parts.
  • this layer is also present in the layer pack forming the negative heat mode image after exposure and further treatment.
  • This extra layer must show a good adhesion to the reducible metal layer (3).
  • This layer must be thin, otherwise the diffusion of heat to layer (3) coming from layer (4) will be insufficient.
  • the thickness of this layer is preferably comprised between 0.1 and 1 ⁇ m. With this particular embodiment the residual pinhole level is even lower than without this extra layer and practically reduced to zero.
  • this thin polymeric film forming layer is composed of polyethylene terephthalate coated from an organic solvent. This particular embodiment is illustrated by fig. 2.
  • the metal salt layer is not incorporated in the original medium but is applied later after image formation and processing by means of a separate laminate.
  • a thermal element (A) comprising, in order, a support (1'), an image forming layer (2'), a release layer (3') and a thermoadhesive layer (4').
  • a stripping sheet (5') and delamination After exposure, lamination of a stripping sheet (5') and delamination, a negative heat mode image is obtained composed of at least part of layer (3') and layer (2') both adhering to support (1'). Again, after delamination, layer (2') shows a lot of pinholes.
  • a laminate (B) comprising a base (6'), preferably also a PET base, optionally a subbing layer (7') and a reducible metal salt layer (8'). Then this laminate is laminated to the negative image formed out of thermal element (A).
  • a base (6') preferably also a PET base
  • a subbing layer (7') and a reducible metal salt layer (8') is laminated to the negative image formed out of thermal element (A).
  • the information-wise and/or overall scanning laser exposure can be performed by an Ar ion laser, a HeNe laser, a Kr laser, a frequency doubled Nd-YAG laser, a dye laser emitting in the visual spectral region.
  • the laser is an infra-red laser.
  • semiconductor diode lasers or solid state lasers such as a Nd-YAG laser emitting at 1064 nm, or a Nd-YLF laser emitting at 1053 nm.
  • Other possible infra-red laser types include diode lasers emitting at 823 nm or diode lasers emitting at 985 nm.
  • Important parameters of the laser recording are the spot diameter (D) measured at the 1/e 2 value of the intensity, the applied laser power on the film (P), the recording speed of the laser beam (v) and the number of dots per inch (dpi).
  • an infra-red lamp is used.
  • the lamination of the stripping sheet to the TAL can be performed before or after the laser exposure.
  • Lamination may be conducted by putting the two materials in contact and then introducing the materials into the nip of a pair of heated laminating rollers under suitable pressure.
  • Suitable laminating temperatures usually range from approximately 60°C to 100°C, preferably from 70°C to 90°C.
  • the lamination temperature may not be too high in order to avoid total blackening of the organic metal salt layer.
  • the delamination can be performed manually or in a delamination apparatus.
  • the stripping layer is held planar and the medium is peeled off at an angle of about 180° at a speed of about 10 m/min.
  • the heat mode image can be used as a master for the exposure of a printing plate or a graphic arts duplicating material.
  • a thermal imaging medium is prepared by coating on a polyethylene terephthalate support (1) having a thickness of 100 ⁇ m, the following layers, in order, :
  • composition of the different layers is represented in table 1.
  • the thus prepared thermal imaging medium was information-wise exposed to intense laser radiation according to the following specifications :
  • a 100 ⁇ m thick polyethylene terephthalate stripping sheet was laminated on top of the exposed thermal imaging medium at 85 °C at a speed of 0.5 m/min. Then this stripping sheet was kept flat and the film was delaminated at an angle of 180° with a speed of 10 m/min approximately.
  • the thermal imaging medium of this example was similar to the one of the previous example with the exception that a polyethylene terephtalate film forming layer (3bis) was coated from the organic solvent hexafluoroisopropanol between layer (3) and layer (4).
  • composition of the thermal imaging medium was as represented by table 2 : TABLE 2 layer composition amount (g/m 2 ) TAL (6) BAYSTAL KA8522 25 RL (5) polyethylene 0.5 " Teflon 0.25 " BAYSTAL KA8522 0.75 " gelatin 0.1 C-layer (4) CORAX L6 1.0 " co(EA-MMA-MAA) 0.8 " ULTRAVON 0.4 layer (3bis) coated PET 0.2 layer (3) BUTVAR B79 3.8 " silver behenate 3.8 " BAYSILON OIL A 0.014 " reducing agent 0.9 " toning agent 0.275 layer (2) silica + co(ViCl 2 -MA-IA) 0.2
  • a thermal element (A) was prepared comprising, in order, an unsubbed polyethylene terephthalate support (1'), a carbon containing image forming layer (2'), a release layer (3') and a TAL (4').
  • the composition is illustrated in table 3.
  • a laminate (B) was prepared comprising, in order, a polyethylene terephthalate support (6'), a subbing layer (7') and a silver behenate + reducing agent containing layer (8').
  • the composition is represented in table 4.
  • the reducing agent and the toning agent were the same as in the previous examples.
  • the thermal element (A) was subjected to the same exposure, lamination (by means of a PET stripping sheet (5')) and delamination steps as the thermal imaging medium of the previous examples.
  • part of release layer (3') and carbon layer (2') adhered to PET support (1') while in the unexposed areas the carbon layer (2'), the release layer (3') and the TAL (4') were removed with the PET stripping sheet (5').
  • a negative heat mode image showing a lot of pinholes in the recorded full areas was obtained on the original support (1') of thermal element (A).
  • laminate (B) was laminated to the negative heat mode element formed out of thermal element (A), layer (8') of (B) and the left over part of layer (3') facing each other, at 85 °C and at a speed of 0.5 m/min.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
EP95203208A 1995-11-22 1995-11-22 Verfahren zur fehlerfreien Herstellung eines Bildes nach dem Wärmeverfahren Withdrawn EP0775594A1 (de)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0599368A1 (de) * 1992-11-17 1994-06-01 Agfa-Gevaert N.V. Thermisches Aufzeichnungsverfahren
WO1995000342A1 (en) * 1993-06-25 1995-01-05 Agfa-Gevaert Naamloze Vennootschap Process for the formation of a heat mode image

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0599368A1 (de) * 1992-11-17 1994-06-01 Agfa-Gevaert N.V. Thermisches Aufzeichnungsverfahren
WO1995000342A1 (en) * 1993-06-25 1995-01-05 Agfa-Gevaert Naamloze Vennootschap Process for the formation of a heat mode image

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"IMPROVED THERMAL IMAGING MEDIUM", RESEARCH DISCLOSURE, no. 374, 1 June 1995 (1995-06-01), pages 378 - 383, XP000519431 *

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