EP0295492A2 - Procédé de diffusion couleur - Google Patents

Procédé de diffusion couleur Download PDF

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Publication number
EP0295492A2
EP0295492A2 EP88108728A EP88108728A EP0295492A2 EP 0295492 A2 EP0295492 A2 EP 0295492A2 EP 88108728 A EP88108728 A EP 88108728A EP 88108728 A EP88108728 A EP 88108728A EP 0295492 A2 EP0295492 A2 EP 0295492A2
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EP
European Patent Office
Prior art keywords
group
dye
color
alkyl
compound
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EP88108728A
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German (de)
English (en)
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EP0295492A3 (en
EP0295492B1 (fr
Inventor
Holger Dr. Ohst
Carlhans Dr. Süling
Günther Dr. Schenk
Kaspar Wingender
Manfred Dr. Peters
Immo Dr. Boie
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Agfa Gevaert AG
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Agfa Gevaert AG
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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
    • G03C8/00—Diffusion transfer processes or agents therefor; Photosensitive materials for such processes
    • G03C8/40—Development by heat ; Photo-thermographic processes
    • G03C8/4013—Development by heat ; Photo-thermographic processes using photothermographic silver salt systems, e.g. dry silver
    • G03C8/4033—Transferable dyes or precursors
    • 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
    • G03C8/00—Diffusion transfer processes or agents therefor; Photosensitive materials for such processes
    • G03C8/40—Development by heat ; Photo-thermographic processes
    • G03C8/4013—Development by heat ; Photo-thermographic processes using photothermographic silver salt systems, e.g. dry silver
    • G03C8/408—Additives or processing agents not provided for in groups G03C8/402 - G03C8/4046
    • G03C8/4086—Base precursors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
    • Y10S430/156—Precursor compound

Definitions

  • the invention relates to a process for producing colored images by the color diffusion process, the development being carried out in the presence of a base which is released under the conditions of development from a base precursor compound.
  • color-imparting compounds are those which can be embedded in the layer of a photographic recording material in a non-diffusing form and which, as a result of the development, can release a diffusible dye (color releaser).
  • a recording material having a layer containing a combination of silver halide, silver benzotriazole, a color releasing agent and guanidine trichloroacetate is exposed imagewise and then subjected to a heat treatment in contact with an image-receiving sheet, whereby the image-released dye is transferred to the image-receiving sheet .
  • the silver halide in each of these combinations being sensitive to a different spectral range of the light and, in accordance with its spectral sensitivity, containing a color releaser which releases a dye of a different color, usually a color that is complementary is the color of the light for which the silver halide in question has a predominant sensitivity.
  • Such assignments can be arranged one above the other in different layers.
  • Alkaline conditions are beneficial for the development and in particular the diffusion of the released dyes; these arise, for example, during the decomposition of the base dispenser mentioned due to the heat treatment.
  • the alkaline conditions arise prematurely, e.g. if the base donor is insufficiently stable, or if a base in the free form is present in the recording material, then the stability of the recording material leaves something to be desired and it is difficult, especially when the recording material is stored for a long time before use, to have a sufficient density difference between areas of low and high exposure to obtain.
  • the invention has for its object to provide a photographic color diffusion process with which simple diffusion images with high maximum color density and low fog can be produced by a simple heat treatment, even if the recording material has been stored for a long time before use.
  • the present invention relates to a process for producing colored images according to the photographic color diffusion process, in which a first sheet-like material which contains at least one light-sensitive silver halide emulsion layer and at least one color-providing compound which is capable of imagewise developing a diffusible dye during development to provide, and / or a second non-photosensitive sheet material containing a base precursor compound will be moistened with an aqueous liquid, whereupon the two sheet materials in contact on the coating side at 40 to 120 ° C warmed and then separated from each other, characterized in that the second sheet material contains in at least one binder layer as a base precursor compound a salt of a weakly acidic organic compound and a strong organic base.
  • the weakly acidic organic compound preferably has a pK A value> 6.
  • the base in the form of a base precursor compound is incorporated into a non-light-sensitive material which is stored separately from the light-sensitive material and is only brought into contact with it during development. Furthermore, the release of the base is not caused by thermal decomposition of the base precursor compound, but rather by its hydrolysis. The presence of water is necessary for this, since the base precursor compound used according to the invention is thermally stable at the processing temperatures.
  • a non-light-sensitive sheet material which has at least one binder layer with a layer on a transparent or opaque substrate contains a salt of a weakly acidic organic acid and a strong organic base dispersed therein.
  • This non-light-sensitive sheet material serves as a processing aid sheet and, if necessary, additionally as an image receiving material. It is brought into contact with the imagewise exposed light-sensitive sheet material on the coating side after at least one of these two sheet-like materials has been sufficiently moistened with an aqueous liquid.
  • the laminate formed in this way is heated to 40 to 120 ° C. and then separated again after a contact time which is sufficient for the development and dye diffusion, for example after 5 to 200 s.
  • Strong organic bases which are suitable for the process according to the invention and which can be used in the form of their salts with weakly acidic organic compounds are, for example, amidines, guanidines, their derivatives and vinylogous compounds which are derived therefrom. Many of these compounds can be described by the following formula I.
  • An aryl group represented by R4 is in particular a phenyl group which may be unsubstituted or substituted, the substituents which are preferably those having an electron donor character (e.g. methyl, methoxy, amino).
  • alkyl groups optionally represented by R1, R2, R3 and R4 may be the same or different, straight-chain or branched and generally contain up to 12 carbon atoms; they preferably contain 1 to 3 carbon atoms.
  • the bases are used as salts of a weakly acidic organic compound, in particular an organic compound with a pK A value> 6.
  • the weakly acidic organic compounds (hereinafter referred to as acid) have, for example, one or more of the following groups:
  • the weakly acidic compounds can also be compounds with a heterocyclic -NH group, in particular compounds in which the group is -NH-ring member of an aromatic ring.
  • the weakly acidic compounds can be in the form of low molecular weight compounds, preferably with a molecular weight of less than 400, or else as a polymer. They preferably correspond to the following formula II R5-SO2-NH-R6 II wherein R5 is alkyl, aryl or a heterocyclic group, each substituted or unsubstituted, and R6 is a radical such as R5 or hydrogen.
  • the compounds A-15, A-19, A-20, A-21 are oligomeric or polymers in which the structures shown are present two or more times.
  • the non-light-sensitive sheet material serves primarily to provide the alkali required for carrying out the process according to the invention in the form of the base liberated from the base precursor compound by hydrolysis if the development is carried out in the presence of water becomes. It can also perform other functions. For example, it may contain a dye-stripping layer that can be colored by diffusing dyes, if the dye-stripping layer is not an integral part of the light-sensitive sheet material.
  • the dye pickling layer serves as an image-receiving layer for receiving and fixing the dyes that have become imagewise diffusible during development. It essentially consists of a binder which contains mordants for the determination of the diffusible dyes formed from the coloring compounds. Long-chain quaternary ammonium or phosphonium compounds, e.g. those as described in US-A-3,271,147 and US-A-3,271,148.
  • stains are also polyvinylimidazole stains which are partially quaternized, for example with benzyl, hydroxyethyl, Alkyl, epoxypropyl, propyl, methyl and ethyl halides, the degree of quaternization being between 1 and 50%.
  • the dye mordants are dispersed in the mordant layer in one of the usual hydrophilic binders, for example in gelatin, polyvinyl alcohol, polyvinyl pyrrolidone, completely or partially hydrolyzed cellulose esters.
  • some binders can also act as mordants, for example polymers of nitrogen-containing, optionally quaternary bases, such as N-methyl-4-vinylpyridine, 4-vinylpyridine, 1-vinylimidazole, as described, for example, in US Pat. No. 2,484,430.
  • Others Usable pickling binders are, for example, guanylhydrazone derivatives of alkyl vinyl ketone polymers, as described, for example, in US Pat. No.
  • the color photographic recording material used in the process according to the invention contains on a dimensionally stable support at least one binder layer which contains a light-sensitive silver halide, optionally in combination with an essentially non-light-sensitive silver salt, and a color-changing compound which can develop a diffusible dye by development.
  • An essential component of the color photographic recording material used according to the invention is therefore the silver halide, which consists of silver chloride, silver bromide, silver iodide or mixtures thereof and can have a particle size between 0.02 and 2.0 ⁇ m, preferably between 0.1 and 1.0 ⁇ m.
  • the silver halide grains can have a regular crystal structure, for example in the form of cubes or octahedra. However, they can also have an irregular crystal structure or be designed in the form of platelets. In the case of mixed crystals, the silver halides can be distributed uniformly over the entire crystal cross section. The silver halide composition can also be different in different areas.
  • silver halide emulsions with a layered grain structure can also be used, in which there are at least two layers with a different silver halide composition.
  • Negative working silver halide emulsions are generally used; In other embodiments, however, directly positive-working silver halide emulsions can also be used, as described, for example, in DE-A-23 32 802, DE-A-23 08 239 and DE-A-22 11 728.
  • the light-sensitive emulsion can be in the form of an unsensitized silver halide or can be chemically and / or spectrally sensitized by suitable additives, the spectral sensitizer being able to be added before, during and after chemical ripening.
  • the amount of light-sensitive silver halide in the respective layer can be between 0.01 and 3.0 g per m 2, the actual amount of silver halide used depending on the requirements of the reactants used and the desired effects.
  • organic silver salts that are approximately the same or less soluble than the light-sensitive silver halide are advantageous.
  • Silver salts of organic cyclic imino compounds are suitable. In preferred examples, these include silver salts of benzotriazole and its derivatives, such as, for example, alkyl-, hydroxy-, sulfo- or halogen-substituted benzotriazoles.
  • the organic silver salt compound that is added can be added in molar excess or deficit or equimolar to the silver halide compound. It must be adapted to the respective requirements in the layer structure.
  • Another essential component of the light-sensitive material used in the method according to the invention is a color-providing compound. As a result of a redox reaction that occurs during development, this can release a diffusible dye. Preferred coloring compounds are referred to below as color releasers.
  • the dye releasers used according to the invention can be a variety of connection types, all of which are distinguished by a link which is redox-dependent in terms of their bond strength and which links a dye residue to a carrier residue containing a ballast residue.
  • Redox-active color releasers of the formula have proven to be particularly advantageous BALLAST - REDOX - DYE, in what mean BALLAST a ballast remnant REDOX is a redox-active group, i.e. a group that can be oxidized or reduced under the conditions of alkaline development and, depending on whether it is in the oxidized or in the reduced state, is subject to different degrees to an elimination reaction, a nucleophilic displacement reaction, a hydrolysis or another cleavage reaction with the result that the rest of DYE is split off, and DYE the rest of a diffusible dye, for example a yellow, purple or cyan dye, or the rest of a dye precursor.
  • a ballast remnant REDOX is a redox-active group, i.e. a group that can be oxidized or reduced under the conditions of alkaline development and, depending on whether it is in the oxidized or in the reduced state, is subject to different degrees to an elimination reaction, a nucleophilic
  • Such residues are to be regarded as ballast residues which make it possible to store the color releasers according to the invention in a diffusion-resistant manner in the hydrophilic colloids usually used in photographic materials.
  • Organic radicals which generally contain straight-chain or branched aliphatic groups with generally 8 to 20 C atoms and optionally also carbocyclic or heterocyclic optionally aromatic groups are preferably suitable for this purpose. With the rest of the molecule, these radicals are either directly or indirectly, for example connected via one of the following groups: -NHCO-, -NHSO2-, -NR-, where R is hydrogen or alkyl, -O- or -S-.
  • ballast residue also contain water-solubilizing groups, such as sulfo groups or carboxyl groups, which may also be in anionic form. Since the diffusion properties depend on the molecular size of the total compound used, it is sufficient in certain cases, for example if the total molecule used is large enough, to use shorter-chain residues as ballast residues.
  • Redox-active carrier residues of the BALLAST-REDOX structure and corresponding color releasers are known in a wide variety of embodiments. A detailed description can be omitted here with regard to the overview article in the app. Chem. Int. Ed. Engl. 22 (1983) 191-209.
  • the groups enclosed in brackets are functional groups of the dye residue and are separated together with this from the remaining part of the carrier residue.
  • the functional group can be a substituent which can have a direct influence on the absorption and, if appropriate, complex formation properties of the released dye.
  • the functional group can also be separated from the chromophore of the dye by an intermediate link or a link.
  • the functional group together with the intermediate member may also be of importance for the diffusion and pickling behavior of the released dye.
  • Suitable intermediate members are, for example, alkylene or aryl groups.
  • the residues of dyes of all classes of dyes are suitable as dye residues insofar as they are sufficiently diffusible to diffuse from the light-sensitive layer of the light-sensitive material into an image-receiving layer.
  • the dye residues can be provided with one or more alkali-solubilizing groups.
  • Suitable alkali-solubilizing groups include carboxyl groups, sulfo groups, sulfonamide groups and aromatic hydroxyl groups.
  • Such alkali-solubilizing groups may already have been pre-formed in the dye releasers used according to the invention or may only result from the cleavage of the dye residue from the carrier residue which contains ballast groups.
  • dyes which are special for the process according to the invention Suitable are to be mentioned: azo dyes, azomethine dyes, anthraquinone dyes, phthalocyanine dyes, indigo dyes, triphenylmethane dyes, including those dyes that are complexed or complexable with metal ions.
  • the residues of dye precursors are to be understood as the residues of those compounds which, in the course of photographic processing, in particular under the conditions of heat development, either by oxidation, by coupling, by complex formation or by exposure of an auxochromic group in a chromophoric system, for example by saponification, can be converted into dyes.
  • Dye precursors in this sense can be leuco dyes, couplers or dyes that are converted into other dyes during processing. Unless a distinction between dye residues and the residues of dye precursors is essential, the latter should also be understood below as dye residues.
  • Suitable color releasing agents are described, for example, in: US-A-3 227 550, US-A-3 443 939, US-A-3 443 940, DE-A-1 930 215, DE-A-2 242 762, DE-A-2 402 900, DE-A-2 406 664, DE-A-2 505 248, DE-A-2 543 902, DE-A-2 613 005, DE-A-2 645 656, DE-A-2 809 716, DE-A-2 823 159, BE-A-861 241, EP-A-0 004 399, EP-A-0 004 400, DE-A-3 008 588, DE-A-3 014 669, EP-A-0 038 092.
  • the color releasers can be present as oxidisable or couplable color releasers, in others as reducible color releasers.
  • the dye is released from the oxidized or from the reduced form of the color releasing agent, negative or positive illumination is obtained from the original when conventional negative-working silver halide emulsions are used. You can therefore create positive or negative images by selecting suitable color releasing systems.
  • the color splitter can be oxidized, then it is itself a reducing agent which is oxidized directly or indirectly with the aid of electron transfer agents (electron transfer agent, ETA) through the imagewise exposed silver halide. This creates a pictorial differentiation in terms of the ability to release the diffusible dye.
  • the color releaser is reducible, then it is expediently used in combination with a reducing agent present in a limited amount, a so-called electron donor compound or an electron donor precursor compound, which in this case in addition to the color releaser and the photosensitive Silver halide is contained in the same binder layer.
  • the use of electron transfer agents can also prove to be advantageous in the case of the use of reducible color releasers in combination with electron donor compounds.
  • a recording material according to the invention which contains reducible color releasers with a carrier residue of the following formula is suitable, for example, for producing positive color images of positive originals (original) when using negative working silver halide emulsions: in what mean R1 alkyl or aryl; R2 is alkyl, aryl or a group which together with R3 completes a fused ring; R3 is hydrogen, alkyl, aryl, hydroxyl, halogen such as chlorine or bromine, amino, alkylamino, dialkylamino including cyclic amino groups (such as piperidino, morpholino), acylamino, alkylthio, alkoxy, aroxy, sulfo, or a group which together with R2 fused one Ring completed; R4 alkyl; R5 alkyl or preferably hydrogen, and wherein at least one of the radicals R1 to R4 contains a ballast radical.
  • the electron donor compound used in combination with a reducible dye releasing agent serves equally as a reducing agent for the silver halide and the color releasing agent. Due to the fact that the silver halide and the color releaser compete with each other to a certain extent in the oxidation of the electron donor compound, but is superior to the latter, the silver halide present becomes determinant for the image areas within which the color releaser through the electron donor compound in its reduced form is transferred.
  • the electron donor compound present in a limited amount is oxidized under the conditions of development, for example when the imagewise exposed color photographic recording material is heated, in accordance with the extent of the exposure and is consequently no longer available for reaction with the color releaser. This creates an image-like distribution of unused electron donor compound.
  • electron donor compounds are described in DE-A-2 947 425, DE-A-3 006 268, DE-A-3 130 842, DE-A-3 144 037, DE-A-3 217 877 and EP-A- 0 124 915 and Research Disclosure 24 305 (July 1984). It has been shown that the electron donor compounds mentioned also meet the requirements placed on them under the conditions of heat development and are therefore also suitable as electron donor compounds in the context of the present invention. Particularly suitable are those electron donor compounds which are formed only under the conditions of heat development in the layer from corresponding electron donor precursor compounds, ie electron donor compounds which are only present in the recording material before development in a capped form in which they are practically ineffective. Under the conditions of heat development, the electron donor compounds, which are initially ineffective, are then converted into their effective form, for example by hydrolytically cleaving off certain protective groups. In the present case, the electron donor precursor compounds mentioned are also understood as electron donor compounds.
  • color releasers which can be coupled and which can release a diffusible dye as a result of a coupling reaction.
  • the dye is only formed by chromogenic coupling, whereby a diffusion-inhibiting ballast group is split off from the coupling position.
  • non-diffusing couplers which contain an already formed dye residue as an escape group in the coupling point, which is split off by coupling and thus becomes diffusible.
  • the dye releasers can also be polymeric couplers of the dye-releasing type, as described, for example, in DE-A-34 22 455.
  • the coloring compound can also be a so-called developer dye, ie a compound which contains both a dye residue and a residue which can be oxidized and thus immobilized by exposed silver halide or by developer oxidation products.
  • the oxidizable residue is a hydroquinone residue.
  • Developer dyes of this type which provide a positive transfer image in conjunction with conventional silver halide emulsions have long been known and are described, for example, in DE-B-1 196 075, US-A-2 983 606, US-A-3 415 644 and US-A-3 594 164; they have also already been described in connection with a method in which the development is carried out by heat treatment, for example EP-A-0 192 272.
  • the above-mentioned essential components of the color photographic recording material namely the silver halide emulsion and the coloring compound, e.g. a color releasing agent, optionally in combination with an electron donor compound, is present next to one another dispersed in a binder.
  • the coloring compound e.g. a color releasing agent, optionally in combination with an electron donor compound
  • a binder can be hydrophobic as well as hydrophilic binders, but the latter are preferred.
  • Gelatin is preferably used as the binder for the light-sensitive layer. However, this can be replaced in whole or in part by other natural or synthetic binders. On natural binders e.g.
  • Alginic acid and its derivatives such as salts, esters or amides, cellulose derivatives such as carboxymethyl cellulose, alkyl cellulose such as hydroxyethyl cellulose, starch and its derivatives and caragenates are suitable.
  • Synthetic binders include polyvinyl alcohol, partially saponified polyvinyl acetate and polyvinyl pyrrolidone.
  • hydrophobic binders are polymers made from polymerizable ethylenically unsaturated monomers such as alkyl acrylates, alkyl methacrylates, styrene, vinyl chloride, vinyl acetate, acrylonitrile and acrylamides. Furthermore, polyester, polyurethane compounds and waxes can be used. Such polymers can be used in latex form, for example.
  • the light-sensitive binder layer contains for the production of monochrome color images assigned to the photosensitive silver halide one or more color releasers, from which dyes of a certain color are released.
  • the overall resulting color can be obtained by mixing several dyes.
  • the color photographic recording material of the present invention contains a plurality, that is to say three, of assignments of color releasers and silver halide which has been sensitized differently, in each case preferably the absorption range of the dye released from the color releaser with the range of the spectral sensitivity of the assigned silver halide im essentially coincides.
  • the various assignments of color releaser and assigned silver halide can be accommodated in different binder layers of the color photographic recording material, with separating layers of a water-permeable binder, for example gelatin, which preferably contain a scavenger for developer oxidation products, which essentially have the function, between these different binder layers to separate the different assignments from each other and thus counteract color distortion.
  • a water-permeable binder for example gelatin
  • a scavenger for developer oxidation products which essentially have the function
  • the color photographic recording material of the present invention contains, for example, a light-sensitive binder layer in which the silver halide contained therein is predominantly red-sensitive due to spectral sensitization and in which a cyan color releaser is included, a further light-sensitive binder layer in which the silver halide contained therein is predominantly green-sensitive due to spectral sensitization and in which a purple dye cleavage is contained, and a third light-sensitive binder layer in which the silver halide contained therein is predominantly blue-sensitive due to its inherent sensitivity or due to spectral sensitization and in which a yellow dye releasing agent is contained.
  • the sensitization assignment can also be changed, which can be advantageous, for example, if the imagewise exposure is not carried out with natural visible light, but with CRT, laser or light-emitting diode light, or also with infrared light.
  • each of the named assignments of light-sensitive silver halide and color releaser is used in the form of a so-called complex coacervate.
  • a complex coacervate is understood to mean a form of dispersion in which a mixture of the essential constituents is enclosed in a common covering made of a hardened binder. Such dispersions are also called packet emulsions. They are obtained through complex coacervation.
  • packet emulsions allows, according to the invention, the combination of several emulsion components, finally the relevant color releasers, in a single binder layer, without losing the spectral assignment and thereby causing a color falsification.
  • This is possible because the degree of exposure of a particular silver halide particle becomes almost exclusively the determining factor for the degree of dye release from the color releaser which is in the same coacervate particle (package) as the silver halide.
  • the use of packet emulsions thus enables a blue-sensitive, a green-sensitive and a red-sensitive silver halide emulsion and spectrally assigned color separators to be accommodated in the same binder layer, without fear of serious color falsification.
  • the color photographic recording material used according to the invention can contain further constituents and auxiliary substances. These further constituents or auxiliary substances can be contained in a light-sensitive layer or in a non-sensitive layer.
  • auxiliary substances are, for example, auxiliary developers.
  • auxiliary developers generally have developing ones Properties for exposed silver halide; in the present case, they primarily have a beneficial effect on the reactions which take place between the exposed silver halide and the reducing agent, the reducing agent being able to be identical to the latter if oxidizable color releasers are used, or the color releasing agent in the case of using reducible color releasers responds. Since this reaction consists mainly of electron transfer, the auxiliary developers are also referred to as electron transfer agents (ETA).
  • ETA electron transfer agents
  • auxiliary developers include hydroquinone, pyrocatechol, pyrogallol, hydroxylamine, ascorbic acid, 1-phenyl-3-pyrazolidone and their derivatives, for example 4-methyl-1-phenyl-3-pyrazolidone, 4,4-dimethyl-1-phenyl- 3-pyrazolidone, 4-hydroxymethyl-4-methyl-1-phenyl-3-pyrazolidone, 4-hydroxymethyl-4-methyl-1-tolyl-3-pyrazolidone and 4,4-dihydroxymethyl-1-phenyl-3-pyrazolidone.
  • auxiliary developers have a catalytic function, it is not necessary for them to be present in stoichiometric amounts. In general, it is sufficient if they are present in the layer in amounts of up to 1/2 mol per mol of color releaser. Incorporation into the layer can take place, for example, from solutions in water-soluble solvents or in the form of aqueous dispersions which have been obtained using oil formers.
  • Color developers are required for coupling color systems. Reference is made here to the customary p-phenylenediamine developers and also to aminophenols. For reasons of stability, it is advantageous to use the developer additives in masked form, the protective group then being split off under the process conditions.
  • the light-sensitive element can also contain an image-receiving layer, in particular if the non-light-sensitive sheet-like material containing the base precursor compound does not already contain such an image-receiving layer.
  • the mordants used in such image-receiving layers have already been mentioned.
  • the image-receiving layer can be arranged above the light-sensitive layers or else below between the light-sensitive layers and the layer support. In both cases the substrate is transparent and there is still an alkali-permeable pigment-containing light-reflecting binder layer between the image-receiving layer and the light-sensitive layers, which serves for the optical separation between negative and positive and as an aesthetically pleasing image background for the transferred positive color image.
  • stripping layers can also be included, which enable the two layer elements to be separated.
  • the supports for the light-sensitive element and, if appropriate, for the image-receiving element must remain dimensionally stable at the process temperature.
  • Standard film or paper documents are eligible. Polyester materials are preferably used.
  • the conventional hardening agents as well as rapid and instant hardeners, which are customary for photographic materials, can be used as hardening agents for both the light-sensitive element and for the image receiving element.
  • Suitable curing agents are described for example in DE-A24 39 551.
  • the aqueous liquid may optionally contain wetting agents and / or anti-limescale agents.
  • a photosensitive member A of a color photographic recording material for the color diffusion process was prepared by coating the layers described below on a transparent substrate made of polyethylene terephthalate. The quantities given relate to 1 m2.
  • An image receiving element B for the recording material was produced by successively applying the following layers to a support made of paper coated with polyethylene.
  • the quantities given here also refer to 1 m2.
  • a pickling layer with 2 g of polyurethane pickle (from 4,4'-diphenylmethane diisocyanate and N-ethyldiethanolamine, quaternized with epichlorohydrin according to DE-A-26 31 521, Example 1), 0.035 g of the compound WA and 2 g of gelatin.
  • a hardening layer with 0.09 g triacrylic formal and 0.85 gelatin 0.09 g triacrylic formal and 0.85 gelatin.
  • the processing was carried out in such a way that the recording material exposed through a step wedge was immersed in water for 3 seconds and then heated to 90 ° C. for 30 seconds in contact with the image-receiving element on the layer side. Then the two elements were separated from each other. A purple negative image of the exposure original was obtained on the image receiving element. When measured behind the green filter, the minimum density was 0.12 and the maximum density was 1.78.
  • the image-receiving element B from Example 1 was modified for Examples 2-16 in such a way that the guanidinium carbonate was replaced by an equivalent amount of the salts (S-) used according to the invention.
  • the transfer color densities obtained (Dmin and Dmax) can be seen from the following table:
  • the salts of weakly acidic organic compounds are particularly advantageous with regard to their storage stability. Depending on the moisture content of the layers or the moisture content of the environment, their tendency to diffuse to the surface and crystallize out there is very slight.
  • the following salts were stored in layer 1 of the image-receiving element B as described in Example 1 and stored at high humidity. The results (visual assessment) are given in the following table.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
EP88108728A 1987-06-13 1988-06-01 Procédé de diffusion couleur Revoked EP0295492B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3719765 1987-06-13
DE19873719765 DE3719765A1 (de) 1987-06-13 1987-06-13 Farbdiffusionsverfahren

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EP0295492A2 true EP0295492A2 (fr) 1988-12-21
EP0295492A3 EP0295492A3 (en) 1989-05-24
EP0295492B1 EP0295492B1 (fr) 1991-03-27

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EP88108728A Revoked EP0295492B1 (fr) 1987-06-13 1988-06-01 Procédé de diffusion couleur

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US (1) US4894312A (fr)
EP (1) EP0295492B1 (fr)
JP (1) JPS643653A (fr)
DE (2) DE3719765A1 (fr)

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JP3584059B2 (ja) * 1994-07-07 2004-11-04 富士写真フイルム株式会社 ハロゲン化銀感光材料を用いたカラーフイルター
US6958181B1 (en) * 2003-09-05 2005-10-25 Hewlett-Packard Development Company, L.P. Protected activators for use in leuco dye compositions
AU2010366640B2 (en) 2010-12-31 2016-06-02 Cilag Gmbh International Systems and methods for high accuracy analyte measurement

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0160313A2 (fr) * 1984-05-04 1985-11-06 Fuji Photo Film Co., Ltd. Matériau photographique en couleurs, sensible à la lumière et développable à chaud
EP0195979A2 (fr) * 1985-03-23 1986-10-01 Agfa-Gevaert AG Matériau d'enregistrement phtographique en couleurs développable à la chaleur

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59174830A (ja) * 1983-03-25 1984-10-03 Fuji Photo Film Co Ltd 熱現像感光材料
JPS59218443A (ja) * 1983-05-26 1984-12-08 Fuji Photo Film Co Ltd 画像形成方法
JPS6151140A (ja) * 1984-08-21 1986-03-13 Fuji Photo Film Co Ltd 熱現像感光材料
JPS6152638A (ja) * 1984-08-22 1986-03-15 Fuji Photo Film Co Ltd 熱現像感光材料
DE3523361A1 (de) * 1985-06-29 1987-01-08 Agfa Gevaert Ag Waermeentwicklungsverfahren und hierfuer geeignetes hilfsblatt
JPS6242152A (ja) * 1985-08-15 1987-02-24 Fuji Photo Film Co Ltd 画像形成方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0160313A2 (fr) * 1984-05-04 1985-11-06 Fuji Photo Film Co., Ltd. Matériau photographique en couleurs, sensible à la lumière et développable à chaud
EP0195979A2 (fr) * 1985-03-23 1986-10-01 Agfa-Gevaert AG Matériau d'enregistrement phtographique en couleurs développable à la chaleur

Also Published As

Publication number Publication date
US4894312A (en) 1990-01-16
EP0295492A3 (en) 1989-05-24
DE3719765A1 (de) 1988-12-22
EP0295492B1 (fr) 1991-03-27
JPS643653A (en) 1989-01-09
DE3862165D1 (de) 1991-05-02

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