US3877943A - Heat developable photographic material - Google Patents

Heat developable photographic material Download PDF

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Publication number
US3877943A
US3877943A US439771A US43977174A US3877943A US 3877943 A US3877943 A US 3877943A US 439771 A US439771 A US 439771A US 43977174 A US43977174 A US 43977174A US 3877943 A US3877943 A US 3877943A
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photographic material
silver
compound
silver salt
group
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US439771A
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Takao Masuda
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Fujifilm Holdings Corp
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Fuji Photo Film Co Ltd
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    • 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
    • G03C1/49845—Active additives, e.g. toners, stabilisers, sensitisers
    • G03C1/49854—Dyes or precursors of dyes

Definitions

  • R and R each represents a hydrogen atom
  • X and Y each represents amonovalent or divalent atomic group necessary for forming a five-membered or six-membered heterocyclic group containing a nitrogen atom(s), the heterocyclic group optionally containing substituent(s) and'lortfused ring(s).
  • This invention relates to heat developable photographic materials, and in particular, it relates to those having at least one photosensitive layer of especially high sensitivity.
  • this invention relates to heat developable photographic materials having at least one photosensitive layer on a support, the layer containing (a) an organic silver salt, (b) a catalytic amount of a photosensitive silver halide or a compound which reacts with the organic silver salt (a) to produce a photosensitive silver halide, (c) a reducing agent, (d) a binder, and (e) as a sensitizer, a compound represented by the general formula described herein.
  • a photographic process using silver halide is one which has heretofore been most widely practiced due to the excellent photographic properties thereof such as high sensitivity and good gradation over all other processes such as an electro-photographic process or a diam-photographic process.
  • silver halide photographic materials used in the photographic process are developed with a developer after image-wise exposure thereof, and then they are subjected to several after-treatments such as stopping, fixation, washing with water or stabilization so that the developed images are not discolored or deteriorated under normal illumination or so that the non-developed part (hereinafter referred to as background) is not blackened.
  • a first process is the so-called one-bath development and fixation method as described in, for example, US. Pat. No. 2,875,048, British Pat. No. 954,453 and German Pat. No. 1,163,142, where the twooperations of development and fixation in the conventional silver halide photographic process are carried out in one bath.
  • a second process is to try to change the wet-type treatment which has been employed in the present silver halide photographic process, to a dry-type treatment, for example, described in German Pat. No. 1,174,159, British Pat. Nos. 943,476 and 951,644, etc.
  • a third process is to try to use, as photosensitive elements, a combination of a main component of a long chain aliphatic carboxylic acid silver salt such as silver behenate, or another silver salt such as silver saccharin or silver benzotriazole, and a catalytic amount of silver halide, for example, as described in Japanese Patent Publication No. 22185/70, and US. Pat. Nos. 3,152,904; 3,457,075; 3,635,719; 3,645,739 and 3,756,829; etc. i
  • This invention belongs to the third method of the above described three types of methods.
  • an object of this invention is to provide heat developable photographic materials having at least one sensitized photosensitive layer.
  • the present invention provides sensitized heat developable photographic materials having at least one photosensitive layer on a support, this layer containing the following components:
  • R and R each represents a hydrogen atom, an alkyl group or a phenyl group
  • X and Y each represents a monovalent or divalent atomic group necessary for forming a fivemembered or six-membered heterocyclic group containing nitrogen atom(s), with the heterocyclic group optionally containing substituent(s) and/or fused ring(s).
  • the photographic materials of this invention produce images of high sensitivity and high density.
  • Suitable alkyl groups for R and R are alkyl groups having 1 to 18 carbon atoms such as, for example, methyl, ethyl propyl, isopropyl, butyl, iso-butyl, secbutyl, tert-butyl, pentyl, hexyl, heptyl, octyl, 2-
  • Suitable atomic groups represented by X and Y are, for example, those derived from thiazoline,
  • R, R", and R each represents a hydrogen atom or an alkyl or aryl group; R, R, R and R each represents a hydrogen atom or an alkyl, alkoxy or aryl group; and X represents an anion such as C11, Br, I, C2H5SO4 f l0 N0 or C10 Se. ⁇ RLQ C: a N
  • R R R R R R R and R each represents a hydrogen atom or an alkyl or aryl group; R and R each represents a hydrogen atom or an alkyl, alkoxy or aryl group; and X represents an anion such as Cl, Br, I, C H SO 5
  • Suitable alkyl groups for R to R are alkyl groups having from 1 to 18, preferably 1 to 12, carbon atoms as described for R and R above.
  • Suitable aryl groups for R to R are phenyl or phenyl groups substituted with at least one alkyl group having 1 to 18 carbon atoms, preferably 1 to 12 carbon atoms as described above.
  • alkoxy groups for R, R R R', R and R are alkoxy groups having 1 to l8, preferably 1 to 12, carbon atoms. Specific examples thereof are the alkoxy groups corresponding to the i above described specific examples of alkyl groups, e.g.,
  • the amount of the component (e), which is a compound effective as a sensitizer in the present invention, which can be added is suitably about to l0 'mole per 1 mole of organic silver salt. This amount can be varied, depending upon the kind of compound used, the kind of organic silver salt, the kind of the catalytic amount of silver halide, the kind of reducing agent, the treating temperature, etc. If the amount of the component (e) exceeds the above described range, the degree of coloration of the light sensitive layer increases very often, which is disadvantageous in some uses. However, when the material is applied to such uses where coloration is not a problem or when compounds of less coloration are used as the component (e), the amount of the component (e) which can be used can exceed this range.
  • organic silver salt (component a) which can be used in the present invention, for example, silver salts of organic compounds containing imino, mercapto or carboxyl group are suitable.
  • organic silver salts are silver benzotriazole, silver saccharin, silver phthalazinone, the silver salt of 3-mercapto-4-phenyl- 1,2,4-triazole, the silver salt of 4-hydroxy-6-methyll,3,3a,7-tetrazaindene, the silver salt of 2-(S-ethylthioglycolamido)-benzothiazole, silver caprate, silver laurate, silver myristate, silver palmitate, silver stearate, silver behenate, silver adipate, silver sebacate, etc.
  • Suitable organic silver salts are described in US. Pat. Nos. 3,761,279; 3,589,903; 3,457,075; 3,152,904; 3,635,719; 3,645,739 and 3,756,829.
  • the component (b) of the present invention is (1) a compound which reacts with the silver salt of the component (a) to form a silver halide, or (2) a silver halide.
  • the former compounds (1) are inorganic compounds of the formula MXn; where M represents a hydrogen atom, an ammonium group or a metal atom (such as a strontium, cadmium,
  • X represents a halogen bromoethanol, dichlorobenzophenone, iodoform, bromoform, carbon tetrabromidegjcarbon tetrachloride,
  • the silver halide'of the latter compound (2) includes silver chloride, silver bromide, silver chloroiodide, silver iodobromide, silver iodobromochloride, silver bromochloride and silver iodide.
  • the photosensitive silver halide can be in any form of crude particles and fine particles, and in particular, an emulsion of extremely fine particles is especially useful.
  • a suitable particle size ranges from about 0.001 to l 1., preferably 0.01 to 0.1 p.-
  • the emulsion containing the photosensitive silver halide can be optionally prepared using any of the convcrntional methods which are known in the photographic art.
  • suitable emulsions are emulsions by the single-jet process, emulsions by the doublejet process, for example, Lippmann emulsions, ammonia process emulsions, thiocyanate or thioether digested emulsions, for example, emulsions as described in U.S. Pat. Nos. 2,222,264 and 3,320,069 and 3,271,157.
  • the silver halide which can be used in this invention can be sensitized using conventional chemical sensitizers which are generally used for silver halide emulsions, for example, reducing agents, sulfur or selenium compounds, gold, platinum or palladium compounds or a mixture thereof. Suitable methods for sensitization are described, for example, in US. Pat. Nos. 2,623,499; 2,399,083; 3,297,447 and 3,297,446.
  • the compound of the above described component (b) can be used alone or in the form of a mixture of two or more compounds.
  • the amount of the component (b) which can be added is suitably in the range of about 0.001 to 0.5 mole, preferably 0.005 to 0.1 mole, per 1 mole of organic silver salt. If the amount of the component (b) is less than this range, the sensitivity of the material is reduced, but on the contrary, if the amount thereof exceeds this range, the existence of too large an amount of the component (b) causes a disadvantageous phenomenon in that when the material is left under normal illumination after heat development thereof, the non-image part gradually becomes blackened, resulting in a damage to the contrast between the non-image part and the image part.
  • the reducing agent of the component (c) of the present invention must be one suitable for the reduction of organic silver salts to form silver images, when heated in the presence of the exposed silver halide as a catalyst.
  • a suitable reducing agent is determined based on the combination with the organic silver salt used, and for example, substituted phenols, substituted or unsubstituted bisphenols, substituted or unsubstituted naphthols, dior poly-hydroxy benzenes, dior poly-hydroxy naphthalenes, hydroquinone monoethers, ascorbic acid or derivatives thereof, 3-pyrazolidones, pyrazol-S- ones, reducing succharides, kojic acid, hinokitiol, etc., are suitable.
  • Hydroquinone chlorohydroquinone, bromohydroquinone, methylhydroquinone, phenylhydroquinone, hydroquinone-monosulfonate, toctylhydroquinone, t-butylhydroquinone, 2,5-dimethylhydroquinone, 2,6-dimethylhydroquinone, methoxyhydroquinone, ethoxyhydroquinone, pmethoxyphenol, p-ethoxyphenol, hy-
  • droquinonemonobenzylether catechol, pyrogallol, resorcin, p-aminophenol, o-aminophenol, N-methyl-paminophenol, 2-methoxy-4-aminophenol, 2,4- diaminophenol, 2-B-hydroxy ethyl-4-aminophenol, p-tbutylphenol, p-t-amylphenol, p-cresol, 2,6-di-t-butyl-pcresol, p-acetophenol, p-phenylphenol, ophenylphenol, 1,4-dimethoxyphenol, 3,4-xylenol, 2,4- xylenol, 2,6-dimethoxyphenol, l-amino-2-naphthol-6- sodium sulfonate, l-naphthylamine-7-sulf0nic acid, 1- hydroxy-4-methoxy-naphthalene, l
  • droxytetronic acid N,N-di( 2-ethoxyethyl hydroxylamine glucose, lactose 1-phenyl-3 pyrazolidone, 4-methyl-4-hydroxymethyl-1-phenyl-3- pyrazolidone, bis( 3-methyl-4-hydroxy-5 -tbutylphenyl )sulfide, 3 ,5-di-t-butyl-4-hydroxybenzyldimethylamine, a,a'-(3,5-di-t-butyl-4-hydroxyphenyl)- dimethylether, etc.
  • These reducing agents can be used in the form of a mixture of two or more of them.
  • a suitable reducing agent is selected in combination with the organic silver salt.
  • higher fatty acid silver salts such as silver behenate are relatively difficulty reduced, and therefore relatively strong reducing agents, for example, bisphenols such as 4,4-methylenebis(3-methyl-5-tbutylphenol) are suitable therefor.
  • relatively weak reducing agents for example substituted phenols such as p-phenylphenol, are suitable for silver salts which are relatively easily reduced, such as silver laurate.
  • strong reducing agents such as ascorbic acid type reducing agents are suitable for silver salts which are extremely difficultly reduced, such as silver benzotriazole.
  • the amount of reducing agent which can be used in this invention as described above will vary depending upon the organic silver salt used and the kind of the reducing agent used, and therefore, the amount cannot be set forth unequivocally, but in general, a range of about 0.1 to 5 moles, preferably 0.5 to 2 moles, per 1 mole of organic silver salt is suitable.
  • an appropriate reducing agent can be selected and used in combination with a specific organic silver salt, and therefore it is unnecessary to specifically define the organic silver salt and reducing agent which are used.
  • the components (a), (b), (c) and (e) are preferably dispersed in a binder and applied on a support.
  • all of the components (a)(b)(c) (e) together can be dispersed in a binder and applied to a support as one layer, or alternatively, these components (a)(b)(c)(e) can be divided into groups and dispersed separately in a binder and then the respective dispersions are applied to a support as individual layers.
  • the binder component ((1) which can be used any and every conventional binder which has heretofore been used in this field is suitable. In general, hydrophobic binders are preferred,
  • hydrophilic binders can also be used. These binders are preferably transparent or semi-transparent, and examples are, for example, natural substances, such as gelatin, gelatin derivatives or a mixture thereof with latex type vinyl polymers, cellulose derivatives, and
  • binder polymer, polyvinyl alcohol, polyvinyl acetate, benzyl cellulose, cellulose acetate, cellulose propionate, cellulose acetatephthalate, etc. If desired, two or more of these binders can optionally be used in admixture.
  • the amount of binder is suitably in a ratio (by weight) of about 4:1 to 1:4, preferably 3:1 to 1:3, on the basis of the organic silver salt. If the component (a) or (c) is a high molecular weight substance which can function as a binder, the use of binder can be omitted.
  • a suitable coating amount ranges from 0.2 to 3 g, preferably 0.3 to L5 g, (as silver) per square meter of the support.
  • An antistatic layer or a conductive layer can be provided in the heat developable photographic materials of this invention.
  • an anti-halation substance and an anti-halation dye can also be incorporated therein.
  • Suitable example of conductive layers are disclosed in U.S. Pat. No. 3,748,137 and examples of anti halation layers in U.S. Pat. Nos. 3,769,019; 3,745,009; and 3,615,432.
  • the heat developable photographic materials of this invention can optionally contain a matting agent, such as starch, titanium dioxide, zinc oxide and silica.
  • a matting agent such as starch, titanium dioxide, zinc oxide and silica.
  • fluorescent brightening agents such as stilbene, triazine, oxazole and coumarin type fluorescent brightening agents can also be contained therein.
  • the heat developable photosensitive layer of this invention can be applied to a support using various coating methods, for example, using a dip method, a airknife method, a curtain coating method as well as an extrusion coating method with a hopper as described in U.S. Pat. No. 2,681,294. If desired, two or more layers can simultaneously be applied.
  • optical sensitizing dyes which have heretofore been used for silver halide emulsions can advantageously be used in the heat developable photographic materials of the present invention for imparting additional sensitivity thereto.
  • Suitable examples are the cyanine dyes and merocyanine dyes as optical sensitizing dyes which can be used in the present invention. These are well known in the art and examples suitable for use are disclosed in U.S. Pat. Nos. 3,457,075, 3,719,495, 3,761,279, etc.
  • merocyanine dyes examples are as follows:
  • sensitizing dyes are preferably added to the 40 lose, cellulose acetate-butyrate, cellulose acetate, polyphotographic materials in the form of a solution or dispersion dissolved or dispersed in an organic solvent.
  • the use of the optical sensitizing dye together with the sensitizer component (e) of this invention causes an increase in the sensitivity of the resulting heat developable photographic material.
  • the content of the optical sensitizing dye in the photographic material of this invention generally is about to 10 mole per 1 mole of the organic silver salt component (a). If the sensitizer of the present invention is effective also as an optical sensitizer, the optical esnsitizing dye need not necessarily be used.
  • an over-coating polymer layer can optionally be provided on the photosentitive layer of the heat developable photographic material of this invention, for the purpose of increasing the transparency of the photosensitive layer, increasing the density of the image formed and improving the storage stability to that it originally possesses (that is, the ability to maintain the original photographic properties, or those immediately possessed after the preparation of the photographic material, even after storage thereof).
  • the thickness of the over-coating polymer layer film is suitably l to pt.
  • Suitable polymers for the top-coating layer are, for example, as follows: Polyvinyl chloride, polyvinyl acetate, vinyl chloride-vinyl acetate copolymer, polyvinyl butyral, polystyrene, polymethylmethacrylate, polyurethane rubber, xylene resin, benzyl cellulose, ethyl celluvinylidene chloride, chlorinated polypropylene, polyvinyl pyrrolidone, cellulose propionate, polyvinyl formal, cellulose acetate-phthalate, polycarbonate, cellulose acetate-propionate, etc.
  • the above described heat developable photographic materials can be developed merely by heating the same, after'exposure to a light source such as a xenon lamp, a tungsten lamp, a mercury lamp, etc.
  • the temperature in the heating is suitably in the range of about to 160C, more preferably to C. Higher temperatures or lower temperatures can be selected within the above described range, by prolonging or reducing the heating time.
  • the time for development is in general about 1 to 60 seconds.
  • the photographic material can be brought into contact with a simple hot plate or the like, or can be brought into contact with a heated drum, or as the case may be, can also be passed through a heated space.
  • high frequency induction heating or laser beam heating can also be utilized.
  • the complex solution was prepared as follows: Aqueous ammonia was added to about 80 ml of an aqueous solution containing 1.7 g of silver nitrate to form a silverammonium complex, and water was added thereto to make the total 100 ml of aqueous solution). Thus, a dispersion containing fine crystals of silver behenate was obtained. This dispersion was left at room temperature (about -30C) for 20 minutes, whereby an aqueous layer and a toluene layer separated from each other.
  • the aqueous layer was first removed, and 400 ml of water were added anew to the remaining toluene layer, which was then washed therewith according to a decantation method. This operation was repeated three times, and then 400 ml of toluene were added to separate the silver behenate by centrifuging. 4 g of silver behenate were obtained in the form of spindle-shaped crystals (long side: about 1 t: short side; about 0.05 p).
  • Material (A) Material (B) Material (C) Relative 50,000 100 600 Sensitivity EXAMPLE 3 Material (A) Material (8) Material (C) Relative 30,000 100 600 Sensitivity EXAMPLE 4 The same amount of the above described Compound (9) was used in place of Compound (1), and the others were the same as used in Example 1.
  • the aqueous phase was first removed, and 400 ml of water was added anew to the remaining phase to wash the same by a decantation method. This operation was repeated three times, and then 400 ml of methanol were added to separate the silver benzotriazole by centrifuging. Thus, 8 g of silver benzotriazole were obtained.
  • the particles of the silver benzotriazole were of a nearly spherical form, having a particle size of about 1 ,1 (diameter).
  • a heat developable photographic material comprising a support having at least one photosensitive layer containing the following components:
  • a catalytic amount of a photosensitive silver halide or a compound which reacts with said organic silver salt (a) to produce a photosensitive silver halide terials (A) to (C) were exposed to a tungsten light 65 a reducing agent,
  • R and R each represents a hydrogen atom, an gen atom or an alkyl group, an alkoxy group or an aryl alkyl group or a phenyl group, and X and Y each repregroup; and X represents an anion. sents a monovalent or divalent atomic group necessary I 4.
  • R, R R R R R R and R each rep- L resents a hydrogen atom an alkyl group, or an aryl R 7 group;
  • R" and R each represents a hydrogen atom or an alkyl group, an alkoxy group or an aryl group; and where R", R R", R", R R R, R, R" and R X represents an anion.
  • each represents a hydrogen atom, an alkyl group or an 5.
  • aryl group: R, R, R and R each represents a hydrowherein the component (e) is Compound No.6
  • component (e) is present in an amount ranging from about to 10 mole per 1 mole of said organic silver salt.
  • organic silver salt (a) is a silver salt of an organic compound containing an imino group, mercapto group or carboxyl group.
  • said component (b) which is capable of forming a lightsensitive silver halide by reaction with said organic silver salt (a) is selected from the group consisting of (i) inorganic halides of the general formula MX wherein M is a hydrogen atom, an ammonium group or a metal atom, X is a halogen atom, and n is 1 when M is a hydrogen atom or an ammonium group or represents the valency of said metal atom when M is a metal, and (-ii) organic halogen compounds.
  • reducing agent (c) is selected from the group consistingiof substituted phenols, substituted or unsubstituted bisphenols, substituted or unsubstituted naphthols, dior poly-hydroxybenzenes, dior polyhydroxynaphthalenes, hydroquinone monoethers, ascorbic acid, ascorbic acid derivatives, 3- pyrazolidones, pyrazoline-S-ones, reducing saccharides, kojic acid, and hinokitiol.
  • said metal is strontium, cadmium, zinc, tin, chromium, sodium, barium, iron, cesium, lanthanum, copper, calcium, nickel, magnesium, potassium, aluminum, antimony, gold, cobalt, mercury, lead, beryllium, lithium, manganese, gallium, indium, rhodium, ruthenium, palladium, platinum, thallium or bismuth and wherein said X is chlorine, bromine or iodine.
  • said compound capable of forming a lightsensitive silver halide by the reaction thereof with said organic silver salt (a) is triphenylmethyl chloride, triphenylmethyl bromide, 2-bromo-2-methylpropane, 2- bromobutyric acid, 2-bromoethanol, dichlorobenzophenone, iodoform, bromoform, carbon tetrabromide or carbon tetrachloride.
  • said light-sensitive silver halide is silver chloride, silver bromide, silver bromoiodide, silver chlorobromoiodide, silver chlorobromide, silver iodide or silve'r chloroiodide.
  • binder is a hydrophobic binder or a hydrophilic binder.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
US439771A 1973-02-06 1974-02-05 Heat developable photographic material Expired - Lifetime US3877943A (en)

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JP1491673A JPS5442249B2 (enrdf_load_stackoverflow) 1973-02-06 1973-02-06

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JP (1) JPS5442249B2 (enrdf_load_stackoverflow)
DE (1) DE2405713A1 (enrdf_load_stackoverflow)
GB (1) GB1428606A (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4212937A (en) * 1977-12-23 1980-07-15 Asahi Kasei Kogyo Kabushiki Kaisha Heat developable photosensitive materials
US4637975A (en) * 1984-09-06 1987-01-20 Fuji Photo Film Co., Ltd. Heat-developable photographic materials
US5508162A (en) * 1995-05-12 1996-04-16 Eastman Kodak Company Photothermographic elements containing a combination of spectral sensitizers
US5510236A (en) * 1995-05-12 1996-04-23 Eastman Kodak Company Spectrally sensitized photothermographic elements
EP0635756A3 (en) * 1993-07-15 1996-05-01 Canon Kk Heat-developable photographic element and imaging process using the same.
JPH10142727A (ja) * 1996-04-30 1998-05-29 Fuji Photo Film Co Ltd 熱現像写真感光材料
US6117624A (en) * 1993-06-04 2000-09-12 Eastman Kodak Company Infrared sensitized, photothermographic article
US6171707B1 (en) 1994-01-18 2001-01-09 3M Innovative Properties Company Polymeric film base having a coating layer of organic solvent based polymer with a fluorinated antistatic agent
EP1582919A1 (en) 2004-03-23 2005-10-05 Fuji Photo Film Co. Ltd. Silver halide photosensitive material and photothermographic material
EP1635216A1 (en) 2004-09-14 2006-03-15 Fuji Photo Film Co., Ltd. Photothermographic material

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2535993A (en) * 1948-12-21 1950-12-26 Gen Aniline & Film Corp Process of preparing trinuclear cyanine dyes
US3679422A (en) * 1970-06-03 1972-07-25 Eastman Kodak Co Photothermic composition containing onium halide sensitizer and the use thereof
US3734733A (en) * 1970-04-09 1973-05-22 Agfa Gevaert Nv Positive working photo-thermographic materials containing bi-imidazolyl compounds and reducing agents and the use thereof in color development

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2535993A (en) * 1948-12-21 1950-12-26 Gen Aniline & Film Corp Process of preparing trinuclear cyanine dyes
US3734733A (en) * 1970-04-09 1973-05-22 Agfa Gevaert Nv Positive working photo-thermographic materials containing bi-imidazolyl compounds and reducing agents and the use thereof in color development
US3679422A (en) * 1970-06-03 1972-07-25 Eastman Kodak Co Photothermic composition containing onium halide sensitizer and the use thereof

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4212937A (en) * 1977-12-23 1980-07-15 Asahi Kasei Kogyo Kabushiki Kaisha Heat developable photosensitive materials
US4637975A (en) * 1984-09-06 1987-01-20 Fuji Photo Film Co., Ltd. Heat-developable photographic materials
US6117624A (en) * 1993-06-04 2000-09-12 Eastman Kodak Company Infrared sensitized, photothermographic article
EP0635756A3 (en) * 1993-07-15 1996-05-01 Canon Kk Heat-developable photographic element and imaging process using the same.
US6171707B1 (en) 1994-01-18 2001-01-09 3M Innovative Properties Company Polymeric film base having a coating layer of organic solvent based polymer with a fluorinated antistatic agent
US5508162A (en) * 1995-05-12 1996-04-16 Eastman Kodak Company Photothermographic elements containing a combination of spectral sensitizers
US5510236A (en) * 1995-05-12 1996-04-23 Eastman Kodak Company Spectrally sensitized photothermographic elements
JPH10142727A (ja) * 1996-04-30 1998-05-29 Fuji Photo Film Co Ltd 熱現像写真感光材料
EP1582919A1 (en) 2004-03-23 2005-10-05 Fuji Photo Film Co. Ltd. Silver halide photosensitive material and photothermographic material
EP1635216A1 (en) 2004-09-14 2006-03-15 Fuji Photo Film Co., Ltd. Photothermographic material

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JPS5442249B2 (enrdf_load_stackoverflow) 1979-12-13
GB1428606A (en) 1976-03-17
JPS49105524A (enrdf_load_stackoverflow) 1974-10-05
DE2405713A1 (de) 1974-08-08

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