EP0792477A2 - Photothermographisches element mit verbesserter haftung zwischen den schichten - Google Patents

Photothermographisches element mit verbesserter haftung zwischen den schichten

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Publication number
EP0792477A2
EP0792477A2 EP95938197A EP95938197A EP0792477A2 EP 0792477 A2 EP0792477 A2 EP 0792477A2 EP 95938197 A EP95938197 A EP 95938197A EP 95938197 A EP95938197 A EP 95938197A EP 0792477 A2 EP0792477 A2 EP 0792477A2
Authority
EP
European Patent Office
Prior art keywords
silver
silver halide
photothermographic
layer
polyvinyl acetal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP95938197A
Other languages
English (en)
French (fr)
Inventor
Thomas C. Geisler
Kimberly K. Marquardt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
Original Assignee
Imation Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Imation Corp filed Critical Imation Corp
Publication of EP0792477A2 publication Critical patent/EP0792477A2/de
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • G03C1/49836—Additives
    • G03C1/49863—Inert additives, e.g. surfactants, binders
    • 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
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/04—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with macromolecular additives; with layer-forming substances
    • 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
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/16—X-ray, infrared, or ultraviolet ray processes
    • G03C5/164—Infrared processes

Definitions

  • This invention relates to radiation sensitized, photothermographic elements composed of silver halide, a reducible silver source, a reducing agent for silver ion, and a binder and in particular to such photo- thermographic elements having emulsion coatings which display improved adhesion to adjacent layers and particularly improved adhesion to polymeric film base and supports.
  • Silver halide-containing, photothermographic imaging materials i.e., heat-developable photographic elements
  • These materials are also known as "dry silver" compositions or emulsions and generally comprise a support having coated thereon: (a) a photosensitive material that generates silver atoms when irradiated; (b) a non-photosensitive, reducible silver source; (c) a reducing agent (i.e., a developer) for silver ion, for example that silver ion in the non-photosensitive, reducible silver source; and (d) a binder.
  • a photosensitive material that generates silver atoms when irradiated
  • a non-photosensitive, reducible silver source i.e., a non-photosensitive, reducible silver source
  • a reducing agent i.e., a developer
  • the photosensitive material is generally photo ⁇ graphic silver halide which must be in catalytic proximity to the non-photosensitive, reducible silver source. Catalytic proximity requires an intimate physical association of these two materials so that when silver atoms (also known as silver specks, clusters, or nuclei) are generated by irradiation or light exposure of the photographic silver halide, those nuclei are able to catalyze the reduction of the reducible silver source. It has long been understood that silver atoms ⁇ Ag°) are a catalyst for the reduction of silver ions, and that the photosensitive silver halide can be placed into catalytic proximity with the non-photosensitive, reducible silver source in a number of different fashions.
  • catalytic proximity can be accomplished by partial metathesis of the reducible silver source with a halogen-containing source (see, for example, U.S. Patent No. 3,457,075); by coprecipitation of silver halide and the reducible silver source material (see, for example, U.S. Patent No. 3,839,049); and other methods that intimately associate the photosensitive, photographic silver halide and the non-photosensitive, reducible silver source.
  • a halogen-containing source see, for example, U.S. Patent No. 3,457,075
  • coprecipitation of silver halide and the reducible silver source material see, for example, U.S. Patent No. 3,839,049
  • other methods that intimately associate the photosensitive, photographic silver halide and the non-photosensitive, reducible silver source.
  • the non-photosensitive, reducible silver source is a material that contains silver ions.
  • the preferred non-photosensitive reducible silver source is a silver salt of a long chain aliphatic carboxylic acid having from 10 to 30 carbon atoms.
  • the silver salt of behenic acid or mixtures of acids of similar molecular weight are generally used. Salts of other organic acids or other organic materials, such as silver imidazolates, have been proposed.
  • 4,260,677 discloses the use of complexes of inorganic or organic silver salts as non-photosensitive, reducible silver sources.
  • the reducing agent for the organic silver salt may be any material, preferably any organic material, that can reduce silver ion to metallic silver.
  • the non-photosensitive reducible silver source e.g., silver behenate
  • the reducing agent for silver ion is reduced by the reducing agent for silver ion. This produces a negative black-and-white image of elemental silver.
  • toning agents may be incorporated to improve the color of the silver image of the photothermographic element.
  • Another method of increasing the maximum image density in photographic and photothermographic emulsions without increasing the amount of silver in the emulsion layer is by incorporating dye-forming or dye-releasing materials in the emulsion. Upon imaging, the dye-forming or dye- releasing material is oxidized, and a dye and a reduced silver image are simultaneously formed in the exposed region. In this way, a dye-enhanced black-and-white silver image can be produced.
  • thermographic and thermographic elements significantly differ from conventional silver halide photographic elements which require wet-processing.
  • a visible image is created by heat as a result of the reaction of a developer incorporated within the element. Heat is essential for development and temperatures of over 100°C are routinely required.
  • conventional wet-processed photographic imaging elements require processing in aqueous processing baths to provide a visible image (e.g., developing and fixing baths) and development is usually performed at a more moderate temperature (e.g., 30°-50°C) .
  • photothermographic elements only a small amount of silver halide is used to capture light and a different form of silver (e.g., silver behenate) is used to generate the image with heat.
  • the silver halide serves as a catalyst for the development of the non-photosensitive, reducible silver source.
  • conventional wet-processed black-and-white photographic elements use only one form of silver (e.g., silver halide) which, upon development, is itself converted to the silver image.
  • photothermographic elements require an amount of silver halide per unit area that is as little as one-hundredth of that used in a conventional wet-processed silver halide.
  • Photothermographic systems employ a light- insensitive silver salt, such as silver behenate, which participates with the developer in developing the latent image.
  • photographic systems do not employ a light-insensitive silver salt directly in the image-forming process.
  • the image in photothermographic elements is produced primarily by reduction of the light-insensitive silver source (silver behenate) while the image in photographic black-and-white elements is produced primarily by the silver halide.
  • photothermographic and thermographic elements all of the "chemistry" of the system is incorporated within the element itself.
  • photothermo ⁇ graphic and thermographic elements incorporate a developer (i.e., a reducing agent for the non-photo ⁇ sensitive reducible source of silver) within the element while conventional photographic elements do not.
  • a developer i.e., a reducing agent for the non-photo ⁇ sensitive reducible source of silver
  • the incorporation of the developer into photo ⁇ thermographic elements can lead to increased formation of "fog" upon coating of photothermographic emulsions as compared to photographic emulsions.
  • developer chemistry is physically separated from the silver halide until development is desired. Much effort has gone into the preparation and manufacture of photothermographic and thermographic elements to minimize formation of fog upon coating, storage, and post-processing aging.
  • the unexposed silver halide inherently remains after development and the element must be stabilized against further development.
  • the silver halide is removed from photographic elements after development to prevent further imaging (i.e., the fixing step).
  • photothermographic and thermographic elements the binder is capable of wide variation and a number of binders are useful in preparing these elements.
  • photographic elements are limited almost exclusively to hydrophilic colloidal binders such as gelatin.
  • photothermographic and thermographic elements require thermal processing, they pose different considerations and present distinctly different problems in manufacture and use.
  • additives e.g., stabilizers, antifoggants, speed enhancers, sensitizers, super- sensitizers, etc.
  • additives e.g., stabilizers, antifoggants, speed enhancers, sensitizers, super- sensitizers, etc.
  • polyester (polyethyleneterephthalate or polyethylenenaphthalate) film support is the preferred film support and polyvinyl butyral is the preferred binder for the photothermographic emulsion layer prevents the alteration of those components to improve adhesion.
  • the present invention describes constructions which improves the adhesion between layers within a photothermographic imaging system, including those spectrally sensitized to the red or infrared, providing improved adhesion between the emulsion layer and adjacent polymeric binder layers or polymeric support layers.
  • a spectrally sensitized photothermographic silver halide element comprising a support layer having on at least one surface thereof a photothermographic composition, said composition comprising a polyvinyl acetal binder, a light insensitive silver source, a reducing agent for silver ion and infrared radiation sensitive silver halide grains, wherein said composition also comprises 1) a dissolved (solution) or dispersed polymeric component which is not a polyvinyl acetal, or 2) a metal soap other than a silver soap of an organic acid (especially not the long chain fatty acid normally present in silver halide based photothermographic elements) , which dispersions and/or solutions are in said composition in an amount of from 0.5 to 20% by weight of said polyvinyl acetal, which polymeric component has higher strength of adhesion to polyester film than does the polyvinyl acetal.
  • the term "emulsion layer” means a layer of a photothermographic element that contains photosensitive silver salt (e.g., silver halide) and silver source material.
  • the ter- "photothermographic element” means a construct: - comprising at least one photothermographic emulsion layer and any supports, topcoat layers, image receiving layers, blocking layers, antihalation layers, subbing or priming layers, etc.
  • the infrared region of the spectrum is defined as 750-1400 nm
  • the visible region of the spectrum is defined as 400-750 nm
  • the red region of the spectrum is defined as 640-750 nm.
  • the red region of the spectrum is 650-700 nm.
  • an adhesion promoting resin and/or a metal soap to the silver layer significantly improves the adhesion of the silver layer to the support and is readily observed in high density image areas where adhesion is poor.
  • Addition of adhesion promoting resins to the photosensitive layer (the silver halide containing layer) can clearly improve the adhesion of the emulsion layer to the support layer (with or without a primer layer thereon) .
  • adhesion promoting resin particles are generated in the silver halide layer by blending two different resins which are not stable in a single phase (using polyvinyl butyral, for example, as the primary binder for the photothermographic layer(s) containing the silver halide) , such binders as polyester resins (e.g., PE 2200 polyester), polyvinyl acetate, resins, etc. separate out of the blend as particles dispersed within the polyvinyl butyral phase. These in si t ⁇ generated particles have been noted as tending to deposit, contact, or adhere to the support (or primer layer on the support) when the silver halide layer containing these materials is coated on the support.
  • polyvinyl butyral for example, as the primary binder for the photothermographic layer(s) containing the silver halide
  • binders as polyester resins (e.g., PE 2200 polyester), polyvinyl acetate, resins, etc.
  • These particles tend to not affect the refractive pattern of the surface of the topcoat layer as they tend to be significantly smaller in size than the thickness of the silver halide containing layer and remain immersed or buried within that layer. These particles may have an average size which appears to be on the order of 1/10 to 2/3 the dimensions of the thickness of the silver halide containing layer.
  • Particular metal soaps evaluated which improved the adhesion of the silver layer to polyester were magnesium stearate and zinc stearate.
  • the present invention includes a photosensitive silver halide in the photothermographic construction.
  • the photosensitive silver halide can be any photosensitive silver halide, such as silver bromide, silver iodide, silver chloride, silver bromo- iodide, silver chlorobromoiodide, silver chlorobromide, etc.
  • the photosensitive silver halide can be added to the emulsion layer in any fashion so long as it is placed in catalytic proximity to the organic silver compound which serves as a source of reducible silver.
  • the silver halide may be in any form which is photosensitive including, but not limited to cubic, octahedral, rhombic dodecahedral, orthrohombic, tetrahedral, other polyhedral habits, etc., and may have epitaxial growth of crystals thereon.
  • Tabular grains are not preferred and are in fact least preferred crystal habits to be used in the photothermo ⁇ graphic elements of the present invention. Narrow grain size distributions of truly tabular grains (e.g., with aspect ratios of 5:1 and greater) can not be readily provided by existing techniques with the preferred grain sizes of less than an average diameter size of 0.10 ⁇ m.
  • tabular there are grains referred to in the art as "tabular,” “laminar,” or “sigma” grains which may have aspect ratios of less than 5:1, such as disclosed in U.S. Patent No. 4,806,461 which shows “tabular” twinned plane grains called laminar grains with aspect ratios equal to or greater than 2:1 with grain thickness of less than 0.5 ⁇ m and grain diameter averages of less than 0.3, but it is not clear that such grains are within the consideration of the ordinarily skilled artisan as laminar or tabular grains as much as they are merely definitions broadening the coverage of the terms without the conceptual benefits of the original disclosures of tabular grains in providing higher capture surface areas to volume ratios for the silver halide grains (e.g., higher projected areas per coating weight of grains as in U.S. Patent Nos. 4,425,425 and 4,425,426).
  • the silver halide grains may have a uniform ratio of halide throughout; they may have a graded halide content, with a continuously varying ratio of, for example, silver bromide and silver iodide; or they may be of the core-shell-type, having a discrete core of one halide ratio, and a discrete shell of another halide ratio.
  • Core-shell type silver halide grains useful in photothermographic elements and methods of preparing these materials are described in allowed copending U.S. Patent Application Serial Number 08/199,114 (filed February 22, 1994) .
  • a core-shell silver halide grain having an iridium doped core is particularly preferred. Iridium doped core-shell grains of this type are described in copending U.S. Patent Application Serial number 08/239,984 (filed May 9, 1994).
  • the silver halide may be prepared ex si tu f (i.e., be pre-formed) and mixed with the organic silver salt in a binder prior to use to prepare a coating solution.
  • the silver halide may be pre-formed by any means, e.g., in accordance with U.S. Patent No. 3,839,049. For example, it is effective to blend the silver halide and organic silver salt using a homogenizer for a long period of time. Materials of this type are often referred to as "pre-formed emulsions.” Methods of preparing these silver halide and organic silver salts and manners of blending them are described in Research Disclosure, June 1978, item 17029; U.S. Patent Nos. 3,700,458 and 4,076,539; and Japanese patent application Nos. 13224/74, 42529/76, and 17216/75.
  • the number average particle size of the grains is between 0.01 and 0.08 ⁇ m; more preferably, between 0.03 and 0.07 ⁇ m; and most preferably, between 0.04 and 0.06 ⁇ m. It is also preferred to use iridium doped silver halide grains and iridium doped core-shell silver halide grains as disclosed in copending U.S. Patent Application Serial Nos. 08/072,153, and 08/239,984 described above.
  • Pre-formed silver halide emulsions when used in the material of this invention can be unwashed or washed to remove soluble salts.
  • the soluble salts can be removed by chill-setting and leaching or the emulsion can be coagulation washed, e.g., by the procedures described in U.S. Patent Nos. 2,618,556; 2,614,928; 2,565,418; 3,241,969; and 2,489,341.
  • the light sensitive silver halide used in the present invention can be employed in a range of about 0.005 mole to about 0.5 mole; preferably, from about 0.01 mole to about 0.15 mole per mole; and more preferably, from 0.03 mole to 0.12 mole per mole of non-photosensitive reducible silver salt.
  • the silver halide used in the present invention may be chemically and spectrally sensitized in a manner similar to that used to sensitize conventional wet process silver halide or state-of-the-art heat- developable photographic materials.
  • it may be chemically sensitized with a chemical sensitizing agent, such as a compound containing sulfur, selenium, tellurium, etc., or a compound containing gold, platinum, palladium, ruthenium, rhodium, iridium, etc., a reducing agent such as a tin halide, etc., or a combination thereof.
  • a chemical sensitizing agent such as a compound containing sulfur, selenium, tellurium, etc.
  • a reducing agent such as a tin halide, etc.
  • sensitizing dyes to the photosensitive silver halides serves to provide them with high sensitivity to visible and infrared light by spectral sensitization.
  • the photosensitive silver halides may be spectrally sensitized with various known dyes that spectrally sensitize silver halide.
  • sensitizing dyes include cyanine dyes, merocyanine dyes, complex cyanine dyes, complex merocyanine dyes, holopolar cyanine dyes, hemicyanine dyes, styryl dyes, and hemioxanol dyes. Of these dyes, cyanine dyes, merocyanine dyes, and complex merocyanine dyes are particularly useful.
  • sensitizing dye added is generally about 10 ⁇ 10 to 10 "1 mole; and preferably, about 10 "8 to 10 "3 moles per mole of silver halide.
  • Supersensitizers To get the speed of the photothermographic elements up to maximum levels and further enhance infrared sensitivity, it is often desirable to use supersensitizers. Any supersensitizer could be used which increases the infrared sensitivity, but the preferred supersensitizers are described in copending U.S. Patent Application Serial No. 07/846,919 and include heteroaromatic mercapto compounds (I) or heteroaromatic disulfide compounds (II) Ar-SM (I) Ar-S-S-Ar (II) wherein M represents a hydrogen atom or an alkali metal atom.
  • Ar represents an aromatic ring or fused aromatic ring containing one or more of nitrogen, sulfur, oxygen, selenium or tellurium atoms.
  • the heteroaromatic ring is benzi- midazole, naphthimidazole, benzothiazole, naphtho- thiazole, benzoxazole, naphthoxazole, benzoselenazole, benzotellurazole, imidazole, oxazole, pyrazole, triazole, thiadiazole, tetrazole, triazine, pyrimidine, pyridazine, pyrazine, pyridine, purine, quinoline or quinazolinone.
  • heteroaromatic rings are envisioned under the breadth of this invention.
  • the heteroaromatic ring may also carry substituents with examples of preferred substituents being selected from the class consisting of halogen (e.g., Br and Cl), hydroxy, amino, carboxy, alkyl (e.g. of 1 or more carbon atoms, preferably 1 to 4 carbon atoms) and alkoxy (e.g. of 1 or more carbon atoms, preferably of 1 to 4 carbon atoms.
  • the preferred supersensitizers are 2-mercaptobenz- i idazole, 2-mercapto-5-methylbenzimidazole and 2-mercaptobenzothiazole.
  • the supersensitizers are used in general amount of at least 0.001 moles/mole of silver in the emulsion layer. Usually the range is between 0.001 and 1.0 moles of the compound per mole of silver and preferably between 0.01 and 0.3 moles of compound per mole of silver.
  • the non-photosensitive reducible silver source that can be used in the present invention can be any material that contains a source of reducible silver ions.
  • it is a silver salt which is comparatively stable to light and forms a silver image when heated to 80°C or higher in the presence of an exposed photocatalyst (such as silver halide) and a reducing agent.
  • Silver salts of organic acids are preferred.
  • the chains typically contain 10 to 30, preferably 15 to 28, carbon atoms.
  • Suitable organic silver salts include silver salts of organic compounds having a carboxyl group. Examples thereof include a silver salt of an aliphatic carboxylic acid and a silver salt of an aromatic carboxylic acid.
  • Preferred examples of the silver salts of aliphatic carboxylic acids include silver behenate, silver stearate, silver oleate, silver laureate, silver caprate, silver myristate, silver palmitate, silver maleate, silver fu arate, silver tartarate, silver furoate, silver linoleate, silver butyrate, silver camphorate, and mixtures thereof, etc.
  • Silver salts that can be substituted with a halogen atom or a hydroxyl group also can be effectively used.
  • Preferred examples of the silver salts of aromatic carboxylic acid and other carboxyl group-containing compounds include: silver benzoate, a silver-substituted benzoate, such as silver 3, 5-dihydroxybenzoate, silver o-methylbenzoate, silver m-methylbenzoate, silver p-methylbenzoate, silver
  • Preferred examples of these compounds include: a silver salt of 3-mercapto-4-phenyl-l,2, 4-triazole; a silver salt of 2-mercaptobenzimidazole; a silver salt of 2-mercapto-5-aminothiadiazole; a silver salt of
  • 2- (2-ethylglycolamido)benzothiazole a silver salt of thioglycolic acid, such as a silver salt of a S-alkyl- thioglycolic acid (wherein the alkyl group has from 12 to 22 carbon atoms) ; a silver salt of a dithio- carboxylic acid such as a silver salt of dithioacetic acid; a silver salt of thioamide; a silver salt of 5-carboxylic-l-methyl-2-phenyl-4-thiopyridine; a silver salt of mercaptotriazine; a silver salt of 2-mercapto- benzoxazole; a silver salt as described in U.S. Patent No. 4,123,274, for example, a silver salt of a
  • 1,2, 4-mercaptothiazole derivative such as a silver salt of 3-amino-5-benzylthio-l,2, -thiazole; and a silver salt of a thione compound, such as a silver salt of 3- (2-carboxyethyl) -4-methyl-4-thiazoline-2-thione as disclosed in U.S. Patent No. 3,201,678.
  • Silver salts of acetylenes can also be used.
  • Silver acetylides are described in U.S. Patent Nos. 4,761,361 and 4,775, 613.
  • a silver salt of a compound containing an imino group can be used.
  • Preferred examples of these compounds include: silver salts of benzotriazole and substituted derivatives thereof, for example silver methylbenzotriazole and silver 5-chlorobenzotriazole, etc.; silver salts of 1,2, 4-triazoles or l-H-tetrazoles as described in U.S. Patent No. 4,220,709; and silver salts of imidazoles and imidazole derivatives.
  • a preferred example of a silver half soap is an equimolar blend of silver behenate and behenic acid, which analyzes for about 14.5% silver and which is prepared by precipitation from an aqueous solution of the sodium salt of commercial behenic acid.
  • Transparent sheet materials made on transparent film backing require a transparent coating.
  • a silver behenate full soap containing not more than about 4 or 5 percent of free behenic acid and analyzing about 25.2 percent silver, can be used.
  • the silver halide and the non-photosensitive reducible silver source material that form a starting point of development should be in catalytic proximity, i.e., reactive association.
  • catalytic proximity or “reactive association” is meant that they should be in the same layer, in adjacent layers, or in layers separated from each other by an intermediate layer having a thickness of less than 1 micrometer (1 ⁇ m) .
  • the silver halide and the non- photosensitive reducible silver source material be present in the same layer.
  • Photothermographic emulsions containing pre-formed silver halide in accordance with this invention can be sensitized with chemical sensitizers, or with spectral sensitizers as described above.
  • the source of reducible silver material generally constitutes about 5 to about 70 percent by weight of the emulsion layer. It is preferably present at a level of about 10 to about 50 percent by weight of the emulsion layer.
  • the reducing agent for the organic silver salt may be any material, preferably organic material, that can reduce silver ion to metallic silver.
  • Conventional photographic developers such as phenidone, hydro- quinones, and catechol are useful, but hindered bisphenol reducing agents are preferred.
  • the photothermographic element used in this invention containing a reducing agent for the non- photosensitive reducible silver source is heat developed, preferably at a temperature of from about 80°C to about 250°C (176°F to 482°F) for a duration of from about 1 second to about 2 minutes, in a substantially water-free condition after, or simultaneously with, imagewise exposure, a black-and- white silver image is obtained either in exposed areas or in unexposed areas with exposed photosensitive silver halide.
  • amidoximes such as phenylamidoxime, 2-thienylamidoxime and p-phenoxy- phenylamidoxime
  • azines such as 4-hydroxy- 3, 5-dimethoxybenzaldehydeazine
  • a combination of aliphatic carboxylic acid aryl hydrazides and ascorbic acid such as 2,2'-bis (hydroxymethyl)propionyl- ⁇ -phenylhydrazide in combination with ascorbic acid
  • a combination of polyhydroxybenzene and hydroxylamine a reductone and/or a hydrazine, such as a combination of hydroquinone and bis (ethoxyethyl)hydroxylamine, piperidinohexose reductone, or formyl-4-methylphenyl- hydrazine
  • hydroxamic acids such as phenylhydroxamic acid, p-hydroxyphenylhydroxamic acid, and
  • 1-naphthyl) ethane a combination of bis-o-naphthol and a 1, 3-dihydroxybenzene derivative, such as 2,4-dihydroxybenzophenone or 2, 4-dihydroxyacetophenone; 5-pyrazolones such as 3-methyl-l-phenyl-5-pyrazolone; reductones, such as dimethylaminohexose reductone, anhydrodihydroaminohexose reductone, and anhydro- dihydro-piperidone-hexose reductone; sulfonamidophemol reducing agents, such as 2, 6-dichloro-4-benzene- sulfonamidophenol and p-benzenesulfonamidophenol; indane-1, 3-diones, such as 2-phenylindane-l, 3-dione; chromans, such as 2,2-dimethyl-7-t-butyl-6-hydroxy- chroman; 1,4-
  • the reducing agent should be present as 1 to 10% by weight of the imaging layer. In multilayer constructions, if the reducing agent is added to a layer other than an emulsion layer, slightly higher proportions, of from about 2 to 15%, tend to be more desirable.
  • the reducing agent for the reducible source of silver may be a compound that can be oxidized directly or indirectly to form or release a dye.
  • the photothermographic element used in this invention containing an optional dye-forming or dye- releasing material is heat developed, preferably at a temperature of from about 80°C to about 250°C (176°F to
  • Leuco dyes are one class of dye-forming material that form a dye upon oxidation. Any leuco dye capable of being oxidized by silver ion to form a visible image can be used in the present invention. Leuco dyes that are both pH sensitive and oxidizable can also be used, but are not preferred. Leuco dyes that are sensitive only to changes in pH are not included within scope of dyes useful in this invention because they are not oxidizable to a colored form.
  • a "leuco dye” or “blocked leuco dye” is the reduced form of a dye that is generally colorless or very lightly colored and is capable of forming a colored image upon oxidation of the leuco or blocked leuco dye to the dye form.
  • the blocked leuco dyes i.e., blocked dye-releasing compounds
  • the resultant dye produces an image either directly on the sheet on which the dye is formed or, when used with a dye- or image-receiving layer, on the image-receiving layer upon diffusion through emulsion layers and interlayers.
  • chromogenic leuco dyes such as indoaniline, indophenol, or azomethine leuco dyes
  • leuco dyes useful in this invention are those derived from azomethine leuco dyes or indoaniline leuco dyes. These are often referred to herein as "chromogenic leuco dyes" because many of these dyes are useful in conventional, wet- processed photography. Chromogenic dyes are prepared by oxidative coupling of a p-phenylenediamine compound or a p-aminophenol compound with a photographic-type coupler. Reduction of the corresponding dye as described, for example, in U.S. Patent No. 4,374,921 forms the chromogenic leuco dye. Leuco chromogenic dyes are also described in U.S. Patent No. 4,594,307.
  • Cyan leuco chromogenic dyes having short chain carbamoyl protecting groups are described in Europea.. Laid Open Patent Application No. 533,008.
  • chromogenic leuco dyes see K. Venkataraman, The Chemistry of Synthetic Dyes, Academic Press: New York, 1952; Vol. 4, Chapter VI.
  • leuco dyes useful in this invention are "aldazine” and "ketazine” leuco dyes. Dyes of this type are described in U.S. Patent Nos. 4,587,211 and 4,795,697. Benzylidene leuco dyes are also useful in this invention. Dyes of this type are described in U.S. Patent No. 4,923,792.
  • PDR pre-formed-dye-release
  • RDR redox-dye-release
  • the reducing agent for the organic silver compound releases a mobile pre ⁇ formed dye upon oxidation. Examples of these materials are disclosed in Swain, U.S. Patent No. 4,981,775.
  • image-forming materials materials where the mobility of the compound having a dye part changes as a result of an oxidation-reduction reaction with silver halide, or an organic silver salt at high temperature can be used, as described in Japanese Patent Application No. 165,054/84.
  • the reducing agent may be a compound that releases a conventional photographic dye coupler or developer on oxidation as is known in the art.
  • the dyes formed or released in the various color- forming layers should, of course, be different. A difference of at least 60 nm in reflective maximum absorbance is preferred. More preferably, the absorbance maximum of dyes formed or released will differ by at least 80-100 nm. When three dyes are to be formed, two should preferably differ by at least these minimums, and the third should preferably differ from at least one of the other dyes by at least 150 nm, and more preferably, by at least 200 nm. Any reducing agent capable of being oxidized by silver ion to form or release a visible dye is useful in the present invention as previously noted.
  • the total amount of optional leuco dye used as a reducing agent used in the present invention should preferably be in the range of 0.5-25 weight percent, and more preferably, in the range of 1-10 weight percent, based upon the total weight of each individual layer in which the reducing agent is employed.
  • the Binder The photosensitive silver halide, the non-photo ⁇ sensitive reducible source of silver, the reducing agent, and any other addenda used in the present invention are generally added to at least one binder.
  • the binder(s) that can be used in the present invention can be employed individually or in combination with one another. It is preferred that the binder be selected from polymeric materials, such as, for example, natural and synthetic resins that are sufficiently polar to hold the other ingredients in solution or suspension.
  • a typical hydrophilic binder is a transparent or translucent hydrophilic colloid.
  • hydrophilic binders include: a natural substance, for example, a protein such as gelatin, a gelatin derivative, a cellulose derivative, etc.; a poly- saccharide such as starch, gum arabic, pullulan, dextrin, etc.; and a synthetic polymer, for example, a water-soluble polyvinyl compound such as polyvinyl alcohol, polyvinyl pyrrolidone, acrylamide polymer, etc.
  • a hydrophilic binder is a dispersed vinyl compound in latex form which is used for the purpose of increasing dimensional stability of a photographic element.
  • Examples of typical hydrophobic binders are polyvinyl acetals, polyvinyl chloride, polyvinyl acetate, cellulose acetate, polyolefins, polyesters, polystyrene, polyacrylonitrile, polycarbonates, methacrylate copolymers, maleic anhydride ester copolymers, butadiene-styrene copolymers, and the like. Copolymers, e.g., terpolymers, are also included in the definition of polymers.
  • the polyvinyl acetals, such as polyvinyl butyral and polyvinyl formal, and vinyl copolymers such as polyvinyl acetate and polyvinyl chloride are particularly preferred.
  • the binder can be hydrophilic or hydrophobic, preferably it is hydrophobic in the silver containing layer(s).
  • these polymers may be used in combination of two or more thereof.
  • the binders are preferably used at a level of about 30-90 percent by weight of the emulsion layer, and more preferably at a level of about 45-85 percent by weight.
  • the binder should be able to withstand those conditions. Generally, it is preferred that the binder not decompose or lose its structural integrity at 250°F (121°C) for 60 seconds, and more preferred that it not decompose or lose its structural integrity at 350°F (177°C) for 60 seconds.
  • the polymer binder is used in an amount sufficient to carry the components dispersed therein, that is, within the effective range of the action as the binder.
  • the effective range can be appropriately determined by one skilled in the art.
  • the formulation for the photothermographic emulsion layer can be prepared by dissolving and dispersing the binder, the photosensitive silver halide, the non-photosensitive reducible source of silver, the reducing agent for the non-photosensitive reducible silver source, and optional additives, in an inert organic solvent, such as, for example, toluene, 2-butanone, or tetrahydrofuran.
  • an inert organic solvent such as, for example, toluene, 2-butanone, or tetrahydrofuran.
  • Toners or derivatives thereof which improve the image, is highly desirable, but is not essential to the element. Toners can be present in an amount of about 0.01-10 percent by weight of the emulsion layer, preferably about 0.1-10 percent by weight. Toners are well known materials in the photo ⁇ thermographic art, as shown in U.S. Patent Nos. 3,080,254; 3,847,612; and 4,123,282.
  • toners include: phthalimide and N-hydroxyphthalimide; cyclic imides, such as succinimide, pyrazoline-5-ones, quinazolinone, 1-phenylurazole, 3-phenyl-2-pyrazoline-5-one, and 2,4-thiazolidinedione; naphthali ides, such as
  • N-hydroxy-1, 8-naphthalimide cobalt complexes, such as cobaltic hexamine trifluoroacetate; mercaptans such as 3-mercapto-l,2, 4-triazole, 2,4-dimercaptopyrimidine, 3-mercapto-4, 5-diphenyl-l,2,4-triazole and 2, 5-dimercapto-l, 3, 4-thiadiazole; N- (aminomethyl)aryl- dicarboximides, such as (N,N-dimethylaminomethyl)- phthalimide, and N- (dimethylaminomethyl)naphthalene- 2, 3-dicarboximide; a combination of blocked pyrazoles, isothiuronium derivatives, and certain photobleach agents, such as a combination of N,N'-hexamethylene- bis (l-carbamoyl-3,5-dimethylpyrazole) , 1, 8- (3, 6-diaza- octane)bis (is
  • the photothermographic elements used in this invention can be further protected against the additional production of fog and can be stabilized against loss of sensitivity during storage. While not necessary for the practice of the invention, it may be advantageous to add mercury (II) salts to the emulsion layer (s) as an antifoggant.
  • Preferred mercury (II) salts for this purpose are mercuric acetate and mercuric bromide.
  • Other suitable antifoggants and stabilizers, which can be used alone or in combination, include the thiazolium salts described in U.S. Patent Nos. 2,131,038 and U.S. Patent No. 2,694,716; the azaindenes described in U.S. Patent Nos. 2,886,437; the triazaindolizines described in U.S. Patent No.
  • Photothermographic elements of the invention can contain plasticizers and lubricants such as polyalcohols and diols of the type described in U.S. Patent No. 2,960,404; fatty acids or esters, such as those described in U.S. Patent Nos. 2,588,765 and
  • the photothermographic elements of the present invention can also include image dye stabilizers.
  • image dye stabilizers are illustrated by U.K. Patent No. 1,326,889; and U.S. Patent Nos. 3,432,300; 3,698,909; 3,574,627; 3,573,050; 3,764,337; and 4,042,394.
  • Photothermographic elements according to the present invention can further contain light-absorbing materials, antihalation, acutance, and filter dyes such as those described in U.S. Patent Nos. 3,253,921; 2,274,782; 2,527,583; 2,956,879, 5,266,452, and 5,314,795. If desired, the dyes can be mordanted, for example, as described in U.S. Patent No. 3,282,699.
  • the photothermographic elements according to the present invention can also contain matting agents such as starch, titanium dioxide, zinc oxide, silica, and polymeric beads including beads of the type described in U.S. Patent Nos. 2,992,101 and 2,701,245.
  • antistatic or conducting layers such as layers that comprise soluble salts, e.g., chlorides, nitrates, etc., evaporated metal layers, ionic polymers such as those described in U.S. Patent Nos. 2,861,056 and 3,206,312 or insoluble inorganic salts such as those described in U.S. Patent No. 3,428,451.
  • soluble salts e.g., chlorides, nitrates, etc.
  • evaporated metal layers ionic polymers such as those described in U.S. Patent Nos. 2,861,056 and 3,206,312
  • insoluble inorganic salts such as those described in U.S. Patent No. 3,428,451.
  • the photothermographic elements of this invention can be constructed of one or more layers on a support.
  • Single layer constructions should contain the silver halide, the non-photosensitive, reducible silver source material, the reducing agent for the non-photosensitive reducible silver source, the binder as well as optional materials such as toners, dye-forming or dye-releasing materials, coating aids, and other adjuvants.
  • Two-layer constructions should contain silver halide and non-photosensitive, reducible silver source in one emulsion layer (usually the layer adjacent to the support) and some of the other ingredients in the second layer or both layers, although two layer constructions comprising a single emulsion layer coating containing all the ingredients and a protective topcoat are envisioned.
  • Multicolor photothermographic dry silver constructions can contain sets of these bilayers for each color or they can contain all ingredients within a single layer, as described in U.S. Patent No. 4,708,928.
  • the various emulsion layers are generally maintained distinct from each other by the use of functional or non-functional barrier layers between the various photosensitive layers, as described in U.S. Patent No. 4,460,681.
  • Barrier layers preferably comprising a polymeric material, can also be present in the photothermographic element of the present invention.
  • Polymers for the material of the barrier layer can be selected from natural and synthetic polymers such as gelatin, poly ⁇ vinyl alcohols, polyacrylic acids, sulfonated poly ⁇ styrene, and the like.
  • the polymers can optionally be blended with barrier aids such as silica.
  • the formulation can be spray-dried or encapsulated to produce solid particles, which can then be redispersed in a second, possibly different, binder and then coated onto the support.
  • the formulation for the emulsion layer can also include coating aids such as fluoroaliphatic polyesters.
  • Photothermographic emulsions used in this invention can be coated by various coating procedures including wire wound rod coating, dip coating, air knife coating, curtain coating, or extrusion coating using hoppers of the type described in U.S. Patent No. 2,681,294. If desired, two or more layers can be coated simultaneously by the procedures described in U.S. Patent ' No. 2,761,791 and British Patent No. 837,095.
  • Typical wet thickness of the emulsion layer can be about 10-150 micrometers ( ⁇ m) , and the layer can be dried in forced air at a temperature of about 20-100°C. It is preferred that the thickness of the layer be selected to provide maximum image densities greater than 0.2, and, more preferably, in the range
  • the latent image obtained after exposure of the heat-sensitive construction can be developed by heating the material at a moderately elevated temperature of, for example, about 80-250°C, preferably about 100-200°C, for a sufficient period of time, generally about 1 second to about 2 minutes. Heating may be carried out by the typical heating means such as a hot plate, an iron, a hot roller, a heat generator using carbon or titanium white, or the like.
  • the development is carried out in two steps. Thermal development takes place at a higher temperature, e.g., about 150°C for about 10 seconds, followed by thermal diffusion at a lower temperature, e.g., about 80°C, in the presence of a transfer solvent.
  • the second heating step at the lower temperature prevents further development and allows the dyes that are already formed to diffuse out of the emulsion layer to the receptor layer.
  • Photothermographic emulsions used in the invention can be coated on a wide variety of supports.
  • the support also known as the substrate
  • the support can be selected from a wide range of materials depending on the imaging requirement.
  • Supports may be transparent or at least translucent.
  • Typical supports include polyester film, subbed polyester film (e.g.,polyethylene terephthalate or polyethylene naphthalate film) , cellulose acetate film, cellulose ester film, polyvinyl acetal film, polyolefinic film (e.g., polethylene or polypropylene or blends thereof) , polycarbonate film and related or resinous materials, as well as glass, paper, and the like.
  • a flexible support is employed, especially a polymeric film support, which can be partially acetylated or coated, particularly with a polymeric subbing or priming agent.
  • Preferred polymeric materials for the support include polymers having good heat stability, such as polyesters. Particularly preferred polyesters are polyethylene terephthalate and polyethylene naphthalate.
  • a support with a backside resistive heating layer can also be used photothermographic imaging systems such as shown in U.S. Patent No. 4,374,921. Use as a Photomask
  • the possibility of low absorbance of the photothermographic element at 380 nm in non-imaged areas facilitates the use of the photo ⁇ thermographic elements of the present invention in a process where there is a subsequent exposure of an ultraviolet radiation sensitive imageable medium.
  • imaging the photothermographic element and subsequent development affords a visible image.
  • the developed photothermographic element absorbs ultra- violet radiation in the areas where there is a visible image and transmits ultraviolet radiation where there is no visible image.
  • the developed element may then be used as a mask and placed between an ultraviolet radiation energy source and an ultraviolet radiation photosensitive imageable medium such as, for example, a photopolymer, diazo material, or photoresist.
  • AcryloidTM A-21 is an acrylic copolymer available from Rohm and Haas, Philadelphia, PA.
  • ButvarTM B-79 is a polyvinyl butyral resin available from Monsanto Company, St. Louis, MO.
  • CAB 171-15S is a cellulose acetate butyrate resin available form Eastman Kodak Co.
  • DesmodurTM N3300 is an aliphatic triisocyanate available from Mobay Chemicals, Pittsburgh, PA.
  • GelvaTM VI.5 is a polyvinyl acetate resin available from Monsanto Company, St. Louis, MO.
  • MEK is methyl ethyl ketone (2-butanone) .
  • MR-60 is a polyketone resin available from Mohawk.
  • PE-2200 is a polyester resin available from Shell.
  • PET is polyethylene terephthalate.
  • Dye-1 has the structure shown below. Its preparation is disclosed in allowed co-pending U.S. Patent Application USS ⁇ 08/202,941 (filed February 28, 1994) .
  • Dye-2 has the structure shown below. Its preparation is disclosed in European Laid Open Patent Application No. 0 616 014 A2.
  • Dye-2 2- (tribromomethylsulphonyl)quinoline has the following structure:
  • the adhesion of a coated emulsion layer of the photothermographic element to a support is significantly improved by the addition of an "adhesion promoting resin" or a metal soap to the silver containing emulsion layer (i.e., the first layer adjacent to the support) coating layer formulation.
  • the "adhesion promoting resin” is a resin which meets the following two criteria:
  • the resin blend adheres to the support more strongly than does the polyvinyl butyral.
  • Resins from the following classes exhibited adhesion to polyester greater than polyvinyl butyral: acrylics, cellulose acetate butyrate, polyamide, polyanhydrides, polyesters, polyketones, polystyrene copolymers, vinyl toluene copolymers, polyvinyl acetate, polyvinyl pyrrolidone/vinyl acetate copolymers, chlorinated rubber and polyimide.
  • Resins meeting this criterion are: cellulose acetate butyrate (CAB 551-0.2, Eastman Chemicals), polyester (Vitel PE-22000, PE-2700, Shell), polyketone (K-3886, K-1717B, MR-60, Mohawk, Union Carbide 252), styrene-butadiene (Pliolite S5A, Goodyear) , vinyl toluene-butadiene (Pliolite VT, Goodyear) , polyvinyl acetate (AYAC, Union Carbide, GelvaTM VI.5, Monsanto) and polyvinyl pyrrolidone/vinyl acetate (PVP/VA E-335, GAF) .
  • Particular metal soaps evaluated which improved the adhesion of the silver layer to polyester were magnesium stearate and zinc stearate.
  • the resin layer-to-support adhesion for each sample was determined according to Method B of ASTM D3359-92a, "Standard Test Methods for Measuring Adhesion by Tape Test” using a 2 mm cross-cut tester (Byk-Gardner) and 3M #610 tape (available from 3M Company, St. Paul. MN) .
  • This test assesses the adhesion of a coating to a support and classifies the adhesion on a zero to five scale, where zero is the poorest adhesion and 5 is the best adhesion.
  • the results, shown below in Table 1, demonstrate that certain resins adhere more strongly than polyvinyl butyral to a polyester support.
  • a pre-formed core-shell silver iodobromide emulsion was prepared by the method described in U.S. Patent Application Serial Number 08/199,114 (filed February 22, 1994) and incorporated herein by reference.
  • the pre-formed silver soap contained 2.0% by weight of a
  • Homogenization of Pre-formed Soaps was prepared by homogenizing the following ingredients:
  • the ingredients above were mixed at 21°C for 10 minutes and held for 24 hours.
  • the mixture was homogenized at 4000 psi and then again at 8000 psi.
  • Topcoat solution A topcoat solution was prepared by mixing the following ingredients in order:
  • Each of the Examples 3A-D was dual coated (tandem or consecutive coated in a single trip) with the topcoat solution on 7 mil (0.18 mm) polyester.
  • the photothermographic silver emulsion orifice was set at 3.7 to 4.0 mil (0.09 to 0.10 mm) and the topcoat solution orifice was set to 5.2 to 5.5 mil (0.13 to
  • the resin layer-to-support adhesion in the Dmax image area for each sample was determined according to method B of ASTM D3359-92a, "Standard Test Methods for Measuring Adhesion by Tape Test” using a 2 mm cross-cut tester (Byk-Gardner) and 3M #610 tape (available from 3M Corporation, St. Paul, MN) . The results are shown below in Table 4.
  • Example 4 The following example illustrates adhesion improvement using zinc stearate. Homogenization of Pre-formed Soaps (Homogenate) :
  • a pre-formed silver fatty acid salt homogenate was prepared by homogenizing the following ingredients:
  • Example 4a The first two ingredients listed above were mixed at 10°C for 120 minutes. Calcium bromide was added and the mixture was allowed to stir an additional 30 minutes, followed by the addition of ButvarTM B-79, and Antifoggant A. PermanaxTM, DesmodurTM N3300 triiso- cyanate, and tetrachlorophthalic acid were added individually with 15 minute mixing intervals. After mixing for 30 minutes, the dispersion was held at 10°C for 16 hours. 2- (3-Chlorobenzolyl)benzoic, Dye-2, and methanol. This emulsion coating dispersion was used in Example 4a.
  • a zinc stearate dispersion was prepared by homogenizing a dispersion of 71.74 parts of methyl ethyl ketone, 10.76 parts of toluene, 1.68 parts of ButvarTM B-79 and 15.82 parts of zinc stearate.
  • a photothermographic silver emulsion coating dispersion was prepared by combining 50.0 g of silver emulsion coating dispersion from above with 5.27 g of the zinc stearate dispersion. This emulsion coating dispersion was used in Example 4b.
  • Topcoat solution A topcoat solution was prepared by mixing the following ingredients in order:
  • Emulsion coating dispersion, Example 4a (control) , and topcoat solution were dual coated on 7 mil (0.18 mm) polyester at a wet thickness of 4.2 mil (0.11 mm) and 5.6 mil (0.14 mm), respectively, and dried for 3 minutes at 82°C (180°F) .
  • Example 4a (of this invention) , Example 4b, and topcoat solution were dual coated on 7 mil (0.18 mm) polyester at a wet thickness of 4.6 mil (0.12 mm) and 6.0 mil (0.15 mm), respectively, and dried for 3 minutes at 82°C (180°F) .
  • Each coated film was exposed to an infrared laser sensitometer containing an 811 nm laser diode and developed by heating to 124°C (255°F) for 15 seconds.
  • the silver layer to support adhesion in the Dmax region for each sample was determined according to method B of ASTM D3359-92a test method using a 2 mm cross-cut tester (Byk-Gardner) and 3M #610 tape (available from 3M Corporation, St. Paul, MN) .
  • Table 5 The silver layer to support adhesion in the Dmax region for each sample was determined according to method B of ASTM D3359-92a test method using a 2 mm cross-cut tester (Byk-Gardner) and 3M #610 tape (available from 3M Corporation, St. Paul, MN) . Table 5

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EP0821270A1 (de) * 1996-07-24 1998-01-28 Agfa-Gevaert N.V. Photothermographisches Material, das einen Infrarotsensibilisator enthält
US6074814A (en) * 1996-07-24 2000-06-13 Agfa-Gevaert Photothermographic material comprising an infra-red sensitizer
US6355405B1 (en) * 1999-02-26 2002-03-12 Eastman Kodak Company Multi-layer article with improved adhesion and method of making
US6350561B1 (en) 2000-12-01 2002-02-26 Eastman Kodak Company Thermally developable imaging materials containing surface barrier layer
EP1484641A1 (de) * 2003-06-06 2004-12-08 Agfa-Gevaert Bindemittel zur Verwendung in wärmeempfindlichen Elementen von thermographischen Aufzeichnungsmaterialien, die im wesentlichen lichtunempfindlich sind
US9523915B2 (en) 2014-11-04 2016-12-20 Carestream Health, Inc. Image forming materials, preparations, and compositions
US9746770B2 (en) 2015-06-02 2017-08-29 Carestream Health, Inc. Thermally developable imaging materials and methods

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US3816122A (en) * 1972-02-02 1974-06-11 Eastman Kodak Co Film element comprising aromatic diester containing copolyester support
US3885965A (en) * 1973-09-04 1975-05-27 Eastman Kodak Co Photothermographic element, composition and process
DE2702919A1 (de) * 1976-01-26 1977-07-28 Canon Kk Durch erwaermung entwickelbares, lichtempfindliches aufzeichnungsmaterial
JPS5911093B2 (ja) * 1977-11-01 1984-03-13 富士写真フイルム株式会社 熱現像感光材料用感光性組成物
JPS55108654A (en) * 1979-02-15 1980-08-21 Fuji Photo Film Co Ltd Heat developable photosensitive material
CA2029980A1 (en) * 1990-01-31 1991-08-01 Gregory J. Mccarney Two-side imageable photothermographic paper
JP2560579B2 (ja) * 1991-09-10 1996-12-04 日本鋼管株式会社 高透磁率を有する高珪素鋼板の製造方法
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