EP0232770B1 - Verfahren zur Herstellung von Farbbildern - Google Patents

Verfahren zur Herstellung von Farbbildern Download PDF

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Publication number
EP0232770B1
EP0232770B1 EP19870100941 EP87100941A EP0232770B1 EP 0232770 B1 EP0232770 B1 EP 0232770B1 EP 19870100941 EP19870100941 EP 19870100941 EP 87100941 A EP87100941 A EP 87100941A EP 0232770 B1 EP0232770 B1 EP 0232770B1
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group
silver halide
color
silver
colour
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French (fr)
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EP0232770A2 (de
EP0232770B2 (de
EP0232770A3 (en
Inventor
Osamu C/O Fuji Photo Film Co. Ltd. Takahashi
Hideaki C/O Fuji Photo Film Co. Ltd. Naruse
Nobuo C/O Fuji Photo Film Co. Ltd. Sakai
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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
    • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
    • G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
    • G03C7/388—Processes for the incorporation in the emulsion of substances liberating photographically active agents or colour-coupling substances; Solvents therefor
    • G03C7/3885—Processes for the incorporation in the emulsion of substances liberating photographically active agents or colour-coupling substances; Solvents therefor characterised by the use of a specific solvent

Definitions

  • the present invention relates to a method for the formation of color images on silver halide color photographic materials and, in particular, to using improved color couplers without the use of benzyl alcohol for the reduction of processing time.
  • a silver halide color photographic material has a multilayer light-sensitive film, as coated on a support, comprising three kinds of silver halide emulsion layers selectively sensitized so that the layers may have a light sensitivity to blue light, green light and red light, individually.
  • a so-called color photographic paper (hereinafter referred to as "color paper") generally has a red-sensitive emulsion layer, a green-sensitive emulsion layer and a blue-sensitive emulsion layer as coated on a support to be exposed to light and, in addition, for example color stain preventive or ultraviolet absorptive intermediate layers and protective layers, are provided between the light-sensitive layers.
  • photographic couplers for the three colors of yellow, magenta and cyan are incorporated into the light-sensitive layers and the photographic materials are, after having been exposed to light, subjected to color development with a so-called color developing agent.
  • the coupling reaction between the oxidized product of an aromatic primary amine and the coupler results in the formation of colored dyes. Coupling speed in the reaction as high as possible and the couplers having higher colorability so as to obtain a higher color density within the limited developing time are desired.
  • the colored dyes are required to be sharp cyan, magenta, and yellow dyes, individually, with less side absorption and to form color photographic images of good color reproduceability.
  • the color photographic images as formed are required to have good preservation stability under various conditions.
  • benzyl alcohol requires diethylene glycol, triethylene glycol or alkanolamines as a solvent, since benzyl alcohol has poor water solubility.
  • Benzyl alcohol and these solvents have high BOD and COD values, which are environmental pollution load values, and, therefore, the elimination of benzyl alcohol is preferable in view of the need to reduce the environmental pollution load.
  • benzyl alcohol is preferably not used in view of the above-mentioned reasons.
  • Color development is, in general, completed within 3 to 4 minutes by conventional means and, recently, reduction of processing time is being required along with the reduction of the time limit for the delivery of commercial color prints and with the reduction of the development laboratory work load.
  • high boiling organic solvents used as coupler solvents are as follows; dibutyl phthalate (for example, as described in Japanese Patent Application (OPI) Nos. 200037/82, 50536/83, 48755/84, 177553/84 and 162256/85, and Japanese Patent Publication No. 29461/74), dioctyl phthalate (for example, as described in Japanese Patent Application (OPI) Nos.
  • the object of the present invention can be achieved by the provision of a new method for the formation of color images
  • a silver halide color photographic material having at least one silver halide emulsion layer on a reflective support, said emulsion layer containing a dispersion of oleophilic fine grains which contains a coupler capable of forming a dye after having been coupled with an oxidation product of an aromatic primary amine developing agent, and at least one high boiling organic solvent, selected from the group consisting of the following formulae (I), (II), (III), (IV) and (V): wherein W i , W 2 and W 3 each represents a substituted or unsubstituted alkyl, cycloaklyl, alkenyl, aryl or heterocyclic group; W 4 represents Wi, O-W 1 , or S-W 1 ; n represents an integer from 1 to 5, and when n is 2 or more, each W 4 may be the same or different; and in the formula (V), W 1 and W 2 may be linked together to form a condensed ring; said photographic material being imagewise exposed and then subjected
  • the phrase "color developer which does not substantially contain benzyl alcohol” means that the concentration of benzyl alcohol in the color developer is 0.5 ml/l or less and, in particular, it is preferred that no benzyl alcohol is contained in the color developer.
  • the mean grain size is measured by the dynamic light scattering photometric method.
  • Preferred substances represented by the above-mentioned formulae (I), (II), (III), (IV) and (V) are those, in which the total of the carbon atoms in W 1 and W 2 or W i , W 2 and W 3 (or W 4 ) is about 8 or more and their dielectric constant is 4.00 or more (25°C, 10 KHz).
  • the dielectric constant can easily be obtained by measuring by means of the transformer bridge method.
  • the substituents may contain one or more linking groups selected from -COO-, -CON ⁇ , -R 8 -N ⁇ , and -O-, where R 8 represents a divalent to hexavalent group derived from a phenyl group by removal of hydrogen atom(s) therefrom.
  • the alkyl group as represented by W i , W 2 , W 3 or W 4 may be either linear or branched, and include, for example, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, a tridecyl group, a tetradecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, an octadecyl group, a nonadecyl group or an eicosyl group.
  • Substituents for these alkyl groups are, for example, in the case of the above-mentioned formula (I), halogen atoms, cycloalkyl groups, aryl groups and ester groups, and examples of the substituted alkyl groups include:
  • Dibasic acid ester-forming groups such as or
  • Lactate-forming groups such as
  • the alkyl group may be substituted by the same substituents as those in the alkyl group of the formula (I) as mentioned above.
  • W 1 and W 2 may be linked together to form a condensed ring such as an oxirane ring, an oxolane ring or an oxane ring.
  • the cycloalkyl group represented by W 1 , W 2 , W 3 or W 4 is, for example, and the substituted cyclohexyl group represented by W 1 , W 2 , W 3 or W 4 is, for example,
  • the aryl group represented by W 1 , W 2 , W 3 or W 4 include, for example, aromatic, substituted or unsubstituted, fused or nonfused, 6-membered rings such as and the substituted aryl group represented by the same is, for example,
  • Alkenyl groups include for example -C 4 H 7 , -C 5 H 9 , -C 6 H 11 , -C 7 H 13 , -C 8 H 15 , -C 10 H 19 , -C 12 H 23 and -C 18 H 35 ; and substituted alkenyl groups include, for example, those substituted by a halogen atom (e.g., F, Cl, Br), -OC 8 H 17 , -OC 12 H 25 , -OCOC 8 H 17 , and -C 8 H 15 , -C 12 H 23 , or include for example
  • a halogen atom e.g., F, Cl, Br
  • the unsubstituted or substituted heterocyclic group represented by .W 1 , W 2 , W 3 , or W 4 includes, for example,
  • the high boiling organic solvents as substituted by the substituents Wi, W 2 , W 3 and/or W 4 have a dielectric constant of 5.00 or more at 25 ° C (10 KHz) and a viscosity of 20 mPa.s or more at 25 ° C. It is surprising that compounds satisfying these conditions can improve the colorability of coloring dyes without deteriorating the absorbance and other characteristics of the dyes. Though the reason for these results is not clear, it is assumed that the high boiling organic solvents having a high dielectric constant can accept a large amount of the color developing agents and those having a viscosity of 20 mPa.s or more at 25 ° C can reduce some adverse effects of the couplers and the silver halides in the oil droplets.
  • the amount of the high boiling organic solvent represented by the formula (I), (II), (III), (IV) or (V) may be any desired amount, depending upon the kinds and the amounts of the couplers used.
  • the ratio by weight of the high boiling solvent/coupler falls, preferably, in the range of 0.05 to 20.
  • the high boiling organic solvents of the formula (I), (II), (III), (IV) or (V) of the present invention can be used singly or in the form of a mixture of two or more of them.
  • the oleophilic fine grains to be used in the present invention can be obtained, in general, by a method where a solution of the compound dissolved in a substantially water-insoluble high boiling organic solvent and a hydrophilic colloid solution are blended and dispersed. This method is described, for example, in U.S. Patents 2,322,027, 2,533,514 and 2,801,171. If necessary, a low boiling solvent or a water-miscible organic solvent can be used, and these solvents are removed by drying evaporation or water-washing. In the case of this method, a surfactant is preferably co-used.
  • the reduction of the grain size of the above-mentioned oleophilic fine grains can be attained by the ingenuity in the apparatus or the operation, including the selection of the kinds of surfactants, the increment of the amount of the surfactant to be used, the increment of the viscosity of the hydrophilic colloid solution, the reduction of the viscosity of the organic layer in which the above-mentioned compound has been dissolved by the co-use of the low boiling solvent, the elevation of the rotation of the stirring blades in the emulsifier to reinforce the cutting force, and increasing emulsifying time.
  • Other methods for the preparation of the oleophilic fine grain dispersion for example, as described in U.S.
  • Patent 3,619,195 West German Patent (OAS) No. 1,957,467 and Japanese Patent Application (OPI) No. 59943/76, can also be utilized.
  • Preferred surfactants are described, for example, in Japanese Patent Publication No. 4923/84 and U.S. Patent 3,676,141.
  • Particularly preferred surfactants are the following compounds having an aliphatic group and a sulfonic acid group. and (ii)
  • the grain size of the oleophilic fine grains of the present invention is 0.25 ⁇ m or less, preferably 0.05 ⁇ m to 0.20 ⁇ m.
  • the oleophilic fine grains may contain, in addition to the coupler, a discoloration inhibitor, an ultraviolet absorbent, a DIR coupler and the like oleophilic photographic elements.
  • the "reflective support" to be used in the present invention is one having an improved reflectivity, which has a function to improve the sharpness of the color image as formed in the silver halide emulsion layer.
  • Examples of such reflective supports include those formed by coating a hydrophobic resin which contains a dispersion of a light-reflective substance such as titanium oxide, zinc oxide, calcium carbonate or calcium sulfate, on a support, or those made of a hydrophobic resin containing a dispersion of such a light-reflective substance.
  • baryta paper, polyethylene-coated paper, polypropylene type synthetic paper, as well as transparent supports on which a reflective layer has been provided or in which a reflective substance has been incorporated such as a lass plate, polyethylene terephthalate, cellulose triacetate, cellulose nitrate and the like polyester films, and polyamide films polycarbonate films and polystyrene films can be used.
  • transparent supports on which a reflective layer has been provided or in which a reflective substance has been incorporated such as a lass plate, polyethylene terephthalate, cellulose triacetate, cellulose nitrate and the like polyester films, and polyamide films polycarbonate films and polystyrene films can be used.
  • These supports can properly be selected in accordance with the use and the object of the photographic materials.
  • the color development step in the present invention progresses rapidly:
  • the processing time is 2 min and 30 s or less.
  • the preferred processing time is 1 to 2 min .
  • Processing time means the time from the first contact of the photographic material to be processed with color developer to contact of the material with the next bath, including the time for the transference of the material between the baths.
  • the color developer to be used in the present invention is preferably an alkaline aqueous solution mainly comprising an aromatic primary amine type color developing agent.
  • Paraphenylenediamine type compounds are preferably used as the color developing agent and typical examples thereof are 3-methyl-4-amino-N,N-diethylaniline, 3-methyl-4-amino-N-ethyl-N- ⁇ -hydroxyethylaniline, 3-methyl-4-amino-N-ethyl-N- ⁇ -methanesulfonamidoethylaniline, 3-methyl-4-amino-N-ethyl-N- ⁇ 3-methoxyethylaniline and sulfates, hydrochlorides, phosphates, p-toluenesulfonates, tetraphenyl borates and p-(t-octyl)benzenesulfonates thereof.
  • 3-methyl-4-amino-N-ethyl-N- ⁇ 3-hydroxyethylaniline, and 3-methyl-4-amino-N-ethyl-N- ⁇ 3- methanesulfonamidoethylaniline are preferred, and in particular, 3-methyl-4-amino-N-ethyl-N- ⁇ -methanesu-Ifonamidoethylaniline, is especially preferred.
  • Aminophenyl type derivatives include, for example, o-aminophenol, p-aminophenol, 4-amino-2-methylphenol, 2-amino-3-methylphenol and 2-hydroxy-3-amino-1,4-dimethylbenzene.
  • the processing temperature of the color developer of the present invention is preferably 30 to 50 ° C, more preferably 33 to 45 ° C.
  • any compounds can be used so far as these do not substantially contain benzyl alcohol.
  • a fog inhibitor may be used in the color developer of the present invention.
  • Alkali metal halides such as potassium bromide, sodium bromide and potassium iodide and organic fog inhibitors are preferably used as the fog inhibitor in the present invention.
  • examples of usable organic fog inhibitors are nitrogen-containing heterocyclic compounds such as benzotriazole, 6-nitrobenzimidazole, 5-nitrosoindazole, 5-methylbenzotriazole, 5-nitrobenzotriazole, 5-chlorobenzotriazole, 2-thiazolylbenzimidazole, 2-thiazolylmethylben- zimidazole, hydroxyazaindolizine; mercapto-substituted heterocyclic compounds such as 1-phenyl-5-mercaptotetrazole, 2-mercaptobenzimidazole, 2-mercaptobenzothiazole; and, additionally, mercapto-substituted aromatic compounds such as thiosalicylic acid.
  • the halides are especially preferred.
  • the color developer of the present invention may further contain pH buffers such as alkali metal carbonates, borates or phosphates; preservatives such as hydroxylamines, triethanolamines, compounds as described in DE-A- 2,622,950, sulfites or bisulfites; organic solvents such as diethylene glycol; dye-forming couplers; competing couplers; nucleating agents such as sodium borohydride; auxiliary developing agents such as 1-phenyl-3-pyrazolidone; tackifiers; and chelating agents such as aminopolycarboxylic acids, e.g., ethylenediaminetetraacetic acid, nitrilotriacetic acid, cyclohexanediaminetetraacetic acid, iminodiacetic acid, N-hydroxymethylethylenediaminetriacetic acid, diethylenetriaminepentaacetic acid, triethylenetetraminehex- aacetic acid and compounds as described in Japanese Patent Application (OPI) No.
  • pH buffers such
  • the color development line may comprise two or more color developer baths and a color developer replenisher can be replenished in the first prebath or in the last postbath whereby the development time can be reduced and the amount of the replenisher may be reduced.
  • the silver halide color photographic materials are, after having been color-developed, generally bleached.
  • the bleaching can be carried out simultaneously with fixation (bleach-fixing) or, alternatively, separately therefrom.
  • the bleaching agent there can be used, for example, compounds of polyvalent metals such as iron (III), cobalt (III), chromium (VI) or copper (II), peracids, quinones and nitroso compounds.
  • ferricyanides, bichromates, organic complexes with iron (III) or cobalt (III) such as complexes of ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, nitrilotriacetic acid, 1,3-diamino-2-propanoltetraacetic acid or the like aminopolycarboxylic acids or with citric acid, tartaric acid, malic acid or the like organic acids, persulfates; manganates; and nitrosophenol can be used.
  • potassium ferricyanide sodium ethylenediaminetetraacetate/iron (III), ammonium ethylenediaminetetraacetate/iron (III), ammonium triethylenetetraminepentaacetate/iron (III) and persulfates are especially preferred.
  • Ethylenediaminetetraacetate/iron (III) complexes are usable both in an independent bleaching solution and in a combined bleach-fixing solution.
  • the bleaching solution and the bleach-fixing solution may contain, if necessary, various kinds of accelerators.
  • various kinds of accelerators for instance, a bromide ion, an iodide ion, as well as thiourea type compounds as described in U.S. Patent 3,706,561, Japanese Patent Publication Nos. 8506/70 and 26586/74, Japanese Patent Application (OPI) Nos. 32735/78, 36233/78 and 37016/78; thiol type compounds as described in Japanese Patent Application (OPI) Nos. 124424/78, 95631/78, 57831/78, 32736/78, 65732/78 and 52534/79 and U.S.
  • Patent 3,893,858 heterocyclic compounds as described in Japanese Patent Application (OPI) Nos. 59644/74, 140129/75, 28426/78, 141623/78, 104232/78 and 35727/79; thioether type compounds as described in Japanese Patent Application (OPI) Nos. 20832/77, 25064/80 and 26506/80; quaternary amines as described in Japanese Patent Application (OPI) No. 84440/73; and thiocarbamoyl type compounds as described in Japanese Patent Application (OPI) No. 42349/74 can be used.
  • the fixing agents can be mentioned thiosulfates, thiocyanates, thioether type compounds, thioureas, and a large amount of iodides.
  • thiosulfates are generally used.
  • sulfites or bisulfites or carbonyl-bisulfuric acid adducts are preferred.
  • the photographic materials are generally rinsed.
  • various kinds of known compounds can be used for the purpose of the prevention of precipitation or of the economization of water.
  • hard water softeners such as inorganic phosphoric acids, aminopolycarboxylic acids or organic phosphoric acids; bactericides or fungicides for the prevention of growth of various bacteria, algae or fungi; hardeners such as magnesium salts or aluminum salts and surfactants for the prevention of drying load or unevenness can be added in need thereof.
  • compounds as described in L.E. West, Photographic Science and Engineering, Vol. 9, No. 6 (1965) can be added.
  • the addition of the chelating agent or fungicide is effective.
  • a multistage (e.g., two- stage to five-stage) countercurrent flow system can be applied to the rinsing step for the purpose of the economization of water.
  • the photographic material may be subjected to multistage countercurrent stabilization system as described in Japanese Patent Application (OPI) No. 8543/82.
  • This step requires a countercurrent system bath line comprising two to nine baths.
  • Various kind of compounds are added to the stabilization baths for the stabilization of images.
  • a pH-regulating buffers such as borates, metaborates, borax, phosphates, carbonates, potassium hydroxide, sodium hydroxide, aqueous ammonia, monocarboxylic acids, dicarboxylic acids and polycarboxylic acids
  • formalin can be added.
  • hard water softeners such as inorganic phosphoric acids, aminopolycarboxylic acids, organic phosphoric acids, aminopolyphosphonic acids and phosphonocarboxylic acids
  • bactericides such as Proxel, isothiazolone, 4-thiazolylbenzimidazole and halogenated phenol-benzotriazoles
  • surfactants fluorescent whiteners, and hardeners
  • ammonium salts such as ammonium chloride, ammonium nitrate, ammonium sulfate, ammonium phosphate, ammonium sulfite, or ammonium thiosulfate can be added as a film pH-regulator for regulating the pH value of the film after processing.
  • the color coupler to be incorporated in the photographic materials preferably has a ballast group or is polymerized to be nondiffusible.
  • 2-Equivalent color couplers where the coupling active positions are substituted by coupling off groups are preferred to 4-equivalent color couplers having hydrogen atoms in the coupling active positions, since the amount of the silver to be coated can be reduced.
  • couplers to form colored dyes with pertinent diffusibility, non-coloring couplers, DIR couplers to release a development inhibitor in the coupling reaction, and couplers to release a development accelerator in the coupling reaction can also be used.
  • yellow couplers which can be used in the present invention are oil-protected acylacetamide type couplers. Specific examples thereof are described in U.S. Patents 2,407,210, 2,875,057 and 3,265,506.
  • 2-equivalent yellow couplers are preferably used, and typical examples thereof are oxygen atom-coupling off type yellow couplers as described in U.S. Patents 3,408,194, 3,447,928, 3,933,501 and 4,022,620 and nitrogen atom-coupling off type yellow couplers as described in Japanese Patent Publication No. 10739/83, U.S. Patents 4,401,752 and 4,326,024, Research Disclosure, RD No.
  • a-Pivaloylacetanilide type couplers are excellent in fastness, especially to light, of the colored dyes.
  • a-benzoylacetanilide type couplers are excellent in producing high color density.
  • Magenta couplers which can be used in the present invention include oil-protected indazolone type or cyanoacetyl type couplers, preferably 5-pyrazolone type couplers and pyrazoloazole type couplers such as pyrazolotriazoles.
  • 5-pyrazolone type couplers those whose 3-position is substituted by an arylamino group or an acylamino group are preferred in view of the hue and the color density of the colored dyes.
  • Typical examples of these couplers are described in U.S. Patents 2,311,082, 2,343,703, 2,600,788, 2,908,573, 3,062,653, 3,152,896 and 3,936,015.
  • Pyrazoloazole type couplers which can be used in the present invention include pyrazolobenzimidazoles as described in U.S. Patent 3,369,879, preferably pyrazolo[5,1-c][1,2,4]triazoles as described in U.S. Patent 3,725,067, pyrazolotetrazoles as described in Research Disclosure, RD No. 24220 (June, 1984) and pyrazolopyrazoles as described in Research Disclosure, RD No. 24230 (June, 1984).
  • imidazo-[1,2-b]pyrazoles as described in European Patent 119,741 are preferred because the yellow side absorption of the dyes formed is small and the light fastness thereof is high, and especially, pyrazolo[1,5-b][1,2,4]-triazoles as described in European Patent 119,860 are particularly preferred.
  • Cyan couplers which can be used in the present invention are oil-protected naphthol type and phenol type couplers. Typical examples thereof are naphthol type couplers as described in U.S. Patent 2,474,293, preferably oxygen atom-coupling off type 2-equivalent naphthol type couplers as described in U.S. Patents 4,052,212, 4,146,396, 4,228,233 and 4,296,200. Specific examples of phenol type couplers are described in U.S. Patents 2,369,929, 2,801,171, 2,772,162 and 2,895,826.
  • Cyan couplers which are fast to moisture and temperature are preferably used in the present invention, and typical examples thereof are phenol type cyan couplers where the phenol nucleus has an ethyl or a higher alkyl group in the m-position as described in U.S. Patent 3,772,002; 2,5-diacylamino-substituted phenol type couplers as described in U.S. Patents 2,772,162, 3,758,308, 4,126,396, 4,334,011 and 4,327,173, DE-A- 3,329,729 and Japanese Patent Application (OPI) No. 166956/84; and phenol type couplers having a 2-ureido group and a 5-acylamino group as described in U.S. Patents 3,446,622, 4,333,999, 4,451,559 and 4,427,767.
  • the graininess can be improved by the incorporation of a coupler capable of forming a colored dye with appropriate diffusibility.
  • a coupler capable of forming a colored dye with appropriate diffusibility.
  • Such dye-diffusible couplers are magenta couplers as described in U.S. Patent 4,366,237 and British Patent 2,125,570 and yellow, magenta or cyan couplers as described in European Patent 96,570 and DE-A- 3,234,533.
  • the dye-forming couplers and the above-mentioned special couplers may be in the form of a dimer or more polymer.
  • Typical examples of the polymerized dye-forming couplers are described in U.S. Patents 3,451,820 and 4,080,211.
  • Specific examples of polymerized magenta couplers are described in British Patent 2,102,173 and U.S. Patent 4,367,282.
  • two or more kinds of the couplers can be incorporated in the same layer of the light-sensitive layer, or the same compound can be incorporated in two or more different layers, so that the photographic material can have the necessary characteristics.
  • the standard amount of the color coupler to be used is within 0.001 to 1 mol per mol of the light-sensitive silver halide, and preferably the amount of the yellow coupler is 0.01 to 0.5 mol, that of the magenta coupler is 0.003 to 0.3 mol and that of the cyan coupler is 0.002 to 0.3 mol, each per mol of the silver halide.
  • the photographic light-sensitive material used in the present invention can for example contain hydroquinone derivatives, aminophenol derivatives, amines, gallic acid derivatives, catechol derivatives, ascorbic acid derivatives, non-coloring couplers and sulfonamidophenol derivatives as a color fog inhibitor or color stain preventing agent.
  • the photographic light-sensitive materials used in the present invention can contain a known discoloration inhibitor.
  • Typical examples of usable organic discoloration inhibitors are hindered phenols such as hydroquinones, 6-hydroxychromans, 5-hydroxycoumarans, spirochromans, p-alkoxyphenols and bisphenols, and gallic acid derivatives, methylenedioxybenzenes, aminophenols, hindered amines, as well as ether and ester derivatives thereof where the phenolic hydroxyl group is silylated or alkylated.
  • metal complexes such as (bissalicylaldoximato)nickel complexes and (bis-N,N-dialkyldithiocarbamato)nickel complexes can also be used.
  • Benzotriazole type ultraviolet absorbents are preferably used for improving preservation stability, especially light fastness, of the cyan-colored images.
  • the ultraviolet absorbent can be co-emulsified with the cyan coupler.
  • the amount of the ultraviolet absorbent to be coated is enough to be satisfactory for imparting the light stability to the cyan-colored images. If, however, the amount is too large, the non-exposed part (white background part) of the color photographic material will be yellowed and, therefore, the amount is, in general, preferably to fall within the range of 1 x 10- 4 mol/m 2 to 2 X 10- 3 mol/m 2 , especially 5 x 10- 4 mol/m 2 to 1.5 x 10- 3 mol/m 2 .
  • the ultraviolet absorbent is incorporated into either one, preferably both, of the layers as adjacent to the both sides of the cyan coupler- containing red-sensitive emulsion layer.
  • the ultraviolet absorbent is added to the intermediate layer between the green-sensitive layer and the red-sensitive layer, this may be co-emulsified with the color stain preventing agent.
  • another protective layer can be provided as an outermost layer.
  • the protective layer can for example contain a matting agent having any desired grain size.
  • the photographic light-sensitive materials used in the present invention can contain the ultraviolet absorbent in the hydrophilic colloid layer.
  • the photographic light-sensitive materials used in the present invention can contain a water-soluble dye in the hydrophilic colloid layer as a filter dye or for irradiation prevention or halation prevention or for other various purposes.
  • the photographic light-sensitive materials used in the present invention can contain whitening agents such as stilbene type, triazine type, oxazole type and coumarin type compounds in the photographic emulsion layers or in other hydrophilic colloid layers.
  • the whitening agents to be used may be water-soluble or, as the case may be, water-insoluble whitening agents can be used in the form of a dispersion thereof.
  • Multilayer natural color photographic materials have, in general, at least one red-sensitive emulsion layer, at least one green-sensitive emulsion layer and at least one blue-sensitive emulsion layer on a support.
  • the order of these layers to be provided on the support can be selected freely in need thereof.
  • Each of the emulsion layers may comprise two or more layers having different degrees of sensitivity or a light-insensitive layer may be provided between two or more layers, having the same color sensitivity.
  • the photographic light-sensitive materials used in the present invention preferably have auxiliary layers such as a protective layer, intermediate layer, filter layer, antihalation layer and backing layer, in addition to the silver halide emulsion layers, when needed.
  • auxiliary layers such as a protective layer, intermediate layer, filter layer, antihalation layer and backing layer, in addition to the silver halide emulsion layers, when needed.
  • Gelatin is advantageously used as the binder or protective colloid to be incorporated into the emulsion layer or intermediate layer of the photographic light-sensitive materials of the present invention, and other hydrophilic colloids can, of course, be used.
  • proteins such as gelatin derivatives, graft polymers of gelatin, and other high molecular weight substances, proteins such as albumin and casein; cellulose derivatives such as hydroxyethyl cellulose, carboxymethyl cellulose and cellulose sulfates; saccharide derivatives such as sodium alginate and starch derivatives; mono- co copolymers various synthetic hydrophilic high molecular weight substances such as polyvinyl alcohol, partially acetalized polyvinyl alcohol, poly-N-vinylpyrrolidone, polyacrylic acid, polymethacrylic acid, polyacrylamide, polyvinyl imidazole and polyvinyl pyrazole, can be used.
  • proteins such as gelatin derivatives, graft polymers of gelatin, and other high molecular weight substances
  • proteins such as albumin and casein
  • cellulose derivatives such as hydroxyethyl cellulose, carboxymethyl cellulose and cellulose sulfates
  • saccharide derivatives such as sodium alginate and starch derivatives
  • Gelatins which can be used in the present invention include lime-treated gelatin, acid-treated gelatin and enzyme-treated gelatin as described in Bull. Scc. Sci. Phot. Japan, No. 16, page 30 (1966); and in addition, hydrolyzed or enzyme-decomposed products of gelatins can also be used.
  • the photographic light-sensitive materials used in the present invention can further contain, in addition to the above-mentioned additives, various kinds of stabilizers, stain inhibitors, developing agents or precursors thereof, lubricants, mordants, matting agents, antistatic agents, plasticizers and other various kinds of additives which are useful for photographic light-sensitive materials. Typical examples of these additives are described in Research Disclosure, RD Nos. 17643 (December, 1978) and 18716 (November, 1979).
  • the silver halide emulsions which can be used in the present invention are those of silver bromide, silver chlorobromide and silver chloride which are substantially free from any silver iodide; and preferred silver halides are silver chlorobromide containing 20 to 98 mol% of silver bromide.
  • silver chlorobromide containing more than 80 mol% of silver chloride is preferably used.
  • the silver halide grains to be used in the present invention may comprise different inner and surface layer phases, or may have a multiphase constitution with epitaxial structure, or otherwise, may have a wholly uniform phase. Further, the present grains may comprise a combination of these structures.
  • the average grain size of the silver halide grains to be used in the present invention is preferably 0.1 /1.m to 2 /1 .m, especially preferably 0.15 ⁇ m to 1 /1.m.
  • the grain size is the grain diameter in the case of spherical or nearly spherical grains or is the side length in the case of cubic grains, and the average grain size is represented on the basis of the mean value of the projected area of the grains.
  • the grain size distribution may be either narrow or broad.
  • a so-called monodispersed silver halide emulsion is preferably used in the present invention, where the value of the standard deviation in the grain size distribution curve of the silver halide emulsion as divided by the average grain size thereof (or, that is, coefficient of variation) can fall within 20% or less, especially preferably 15% or less.
  • two or more monodispersed silver halide emulsions (where the monodispersed system preferably has the above-defined variation coefficient) having substantially the same color sensitivity but having different grain size distributions can be incorporated in the same layer or into plural different layers as laminated.
  • two or more kinds of polydispersed silver halide emulsions or a combination of a monodispersed emulsion and a polydispersed emulsion can be used in mixture or in laminate.
  • the shape of the silver halide grains to be used in the present invention may be a cubic, octahedral, dodecahedral, tetradecahedral or the like regular crystal, or may be a spherical or the like irregular crystal or, otherwise, the present grains may comprise composite forms of these crystal shapes. Cubic, tetradecahedral or the like regular crystal grains are preferably used. Further, the present grains may be tabular and, in particular, an emulsion where in 50% or more of the total projected area of the grains comprise tabular grains having an aspect ratio (length/thickness) of 5 or more, especially 8 or more, can be used in the present invention.
  • An emulsion comprising a mixture of these various kinds of crystal forms can, of course, be used.
  • These various kinds of emulsions may belong to either a surface latent image type where a latent image is formed essentially on the surface of the grains or an internal latent image type where a latent image is formed essentially in the inner part of the grains.
  • the surface latent image type silver halide emulsion is preferably used in the present invention.
  • the photographic emulsions to be used in the present invention can be prepared by a variety of methods, for example, as described in P. Glafkides, Chimie et Physique Photographique (Paul Montel Co., 1967), G.F. Duffin, Photographic Emulsion Chemistry (Focal Press Co., 1966) and V.L. Zelikman et al., Making and Coating Photographic Emulsion (Focal Press Co., 1964).
  • the present emulsions can be obtained by any of an acidic method, a neutral method, or an ammonia method; and for the reaction of a soluble silver salt and a soluble halide, a single jet method, a double jet method or a combination thereof can be utilized.
  • a so-called reverse mixing method where the grains are formed in the presence of excess silver ions can also be utilized.
  • a so-called controlled double jet method which is one type of the double jet method can also be utilized, where the pAg value in the liquid phase to form the silver halide grains is kept constant. According to this method, silver halide emulsions having a regular crystalline form and a nearly uniform grain size can be obtained.
  • emulsions as prepared by a conversion method comprising a step for converting the already formed silver halide grains into those having a smaller solubility product during the procedure up to the completion of the formation of the silver halide grains, or emulsions as prepared by a method where the same halogen conversion is applied to the already formed grains after completion of the formation of the grains, can also be used.
  • a cadmium salt, a zinc salt, a lead salt, a thallium salt, an iridium salt or a complex thereof, a rhodium salt or a complex thereof and an iron salt or a complex thereof can exist for preventing the reciprocity law failure, e.g. increasing the sensitivity and controlling the gradation in the step for the formation of the silver halide grains or the physical ripening thereof.
  • the silver halide grains are generally subjected to physical ripening, demineralization or chemical ripening, after the formation thereof, and then coated on a support.
  • Known silver halide solvents for example, ammonia, rhodankali or thioethers and thione compounds as described in U.S. Patent 3,271,157 and Japanese Patent Application (OPI) Nos. 12360/76, 82408/78, 144319/78, 100717/79 and 155828/79) can be used in precipitation, physical ripening and chemical ripening.
  • the removal of soluble silver salts from the physically ripened emulsions can be carried out by noodle washing, flocculation precipitation or ultrafiltration.
  • the silver halide emulsions to be used in the present invention can be sensitized by a sulfur sensitization method where in sulfur-containing compound capable of reacting with an active gelatin or silver (for example, thiosulfates, thioureas, mercapto compounds and rhodanines) are used; a reductive sensitization method where in reducing substances (for example, stannous salts, amines, hydrazine derivatives, formamidine sulfinic acid, silane compounds) are used; or a noble metal sensitization method where in metal compounds (for example, gold complexes as well as complexes of the Periodic Table VIII group metals such as Pt, lr, Pd, Rh, Fe) are used; and these sensitization methods can be utilized singly or in the form of a combination thereof.
  • sulfur sensitization method where in sulfur-containing compound capable of reacting with an active gelatin or silver (for example, thiosulfates, thioureas,
  • the single sulfur sensitization is more preferred.
  • Each of the blue-sensitive, green-sensitive and red-sensitive emulsions of the present invention are spectrally sensitized with methine dyes or the like other dyes so as to have the respective color sensitivity.
  • Usable dyes include cyanine dyes, merocyanine dyes, complex cyanine dyes, complex merocyanine dyes, holopolar cyanine dyes, hemicyanine dyes, styryl dyes and hemioxonol dyes.
  • Especially useful dyes are those belonging to cyanine dyes, merocyanine dyes and complex merocyanine dyes. Any and every basic heterocyclic nucleus which may generally be contained in cyanine dyes may be applied to these dyes.
  • such nuclei include pyrroline, oxazoline, thiazoline, pyrrole, oxazole, thiazole, selenazole, imidazole, tetrazole and pyridine nuclei; alicyclic hydrocarbon ring-fused heterocyclic nuclei; and aromatic hydrocarbon ring-fused heterocyclic nuclei such as indolenine, benzindolenine, indole, benzoxazole, naphthoxazole, benzothiazole, naphthothiazole, benzoselenazole, benzimidazole and quinoline nuclei. These nuclei may be substituted on their carbon atoms.
  • Merocyanine dyes and complex merocyanine dyes may contain a ketomethylene structure-containing 5-or 6-membered heterocyclic nucleus, such as pyrazolin-5-one, thiohydantoin, 2-thiooxazolidine-2,4-dione, thiazolidine-2,4-dione, rhodanine or thiobarbituric acid nucleus.
  • a ketomethylene structure-containing 5-or 6-membered heterocyclic nucleus such as pyrazolin-5-one, thiohydantoin, 2-thiooxazolidine-2,4-dione, thiazolidine-2,4-dione, rhodanine or thiobarbituric acid nucleus.
  • sensitizing dyes can be used singly or in the form of a mixture thereof, and the combination of the sensitizing dyes is often utilized for the purpose of supersensitization.
  • Typical examples thereof are described in U.S. Patents 2,688,545, 2,977,229, 3,397,060, 3,522,052, 3,527,641, 3,617,293, 3,628,964, 3,666,480, 3,672,898, 3,679,428, 3,703,377, 3,769,301, 3,814,609, 3,837,862 and 4,026,707, British Patents 1,344,281 and 1,507,803, Japanese Patent Publication Nos. 4936/68 and 12375/78, and Japanese Patent Application (OPI) Nos. 110618/77 and 109925/77.
  • Dyes which themselves have no spectral sensitization activity or substances which do not substantially absorb visible rays but have a supersensitization activity can be incorporated into the emulsions together with the sensitizing dyes.
  • the grain size was measured by the use of a grain size measuring apparatus with laser ray-scattering.
  • the total amount of the resulting dispersion was added to a silver chlorobromide emulsion comprising 80% of Br (Ag content: 70 g/kg), and the resulting emulsion was coated on a paper support laminated on both sides thereof with polyethylene, the coated Ag amount being 0.31 g/m 2 , and a gelatin layer was provided over the thus coated layer to obtain Sample No. 1.
  • Sodium 1-hydroxy-3,5-dichloro-s-triazine was used as the gelatin hardener.
  • Sample Nos. 13 through 20 and Sample Nos. 21 through 28 were formed in the same manner as Sample Nos. 1 through 12 with the exception that a Magenta Coupler (M-1) and a Cyan Coupler (C-1) were used, respectively, in place of a Yellow Coupler (Y-1).
  • M-1 Magenta Coupler
  • C-1 Cyan Coupler
  • the amount of the coated coupler was 0.37 g/m 2 , and the Ag-coated amount of the silver chlorobromide emulsion (Br content: 75 mol%) was 0.20 g/m 2 ; and in the case of the use of the cyan coupler, the amount of the coated coupler was 0.33 g/m 2 , and the Ag-coated amount of the silver chlorobromide emulsion (Br content: 70 mol%) was 0.28 g/m 2 .
  • Step (A) or (B) were subjected to gradation exposure for sensitometry and thereafter processed by the following Step (A) or (B), each using the following Color Developer (A) or (B), respectively.
  • Steps (A) and (B) were the same with the differentiation of only the use of Color Developer (A) or (B) in each step.
  • the evaluation of the photographic properties was made on the two items of the maximum density (Dmax) and the minimum density (Dmin).
  • Table 1 proves that the samples (Sample Nos. 6, 8, 10, 12, 16, 18, 20, 24, 26 and 28) of the present invention had sufficient maximum density both in Step (A) and in Step (B) in the use of any of the yellow, magenta and cyan couplers, while the decrease in color density was especially noticeable in the comparative samples (Sample Nos. 1 to 5, 7, 9, 11, 13 to 15, 17, 19, 21 to 23, 25 and 27) when processed in Step (B) with no benzyl alcohol.
  • a multilayer color photographic paper of the present invention was formed, having the layers as shown in the following Table 2, the layers being provided on a paper support laminated on both sides thereof with polyethylene.
  • This light-sensitive material was designated as Sample (a).
  • the coating solutions were prepared as follows:
  • the following blue-sensitive sensitizing dye was added to a silver chlorobromide emulsion (silver bromide content: 80 mol%, silver content: 70 g/kg) in an amount of 7.0 x 10- 4 mol per mol of the silver chlorobromide to obtain 90 g of a blue-sensitive emulsion.
  • the emulsified dispersion and the emulsion were blended and dissolved, and the gelatin concentration was regulared as shown in Table 2 to obtain a first layer-coating solution.
  • the other second layer- to seventh layer-coating solutions were prepared in the same manner as the first layer-coating solution.
  • the spectral sensitizer as used in each emulsion was as follows:
  • the anti-irradiation dye as used in each layer was as follows:
  • Second Layer Color Stain Presenting Layer
  • Polyethylene laminated paper (containing white pigment of Ti0 2 and bluish dye of ultramarine in the polyethylene on the side supporting the first layer)
  • the photographic process comprised color development, bleach-fixing and rinsing; and the photographic characteristics of the samples were evaluated by varying the development 1 min, 2 min, and 3 min. Steps (A) and (B) were the same with the differentiation of only the use of Color Developer (A) or (B) in each step.
  • the evaluations of the photographic characteristics were made on four items of relative sensitivity, gradation, maximum density (Dmax) and minimum density (Dmin).
  • the relative sensitivity was represented by a relative value on the basis of the index value (100) of the sensitivity of each sample as processed by Step (A) wherein the color development time was 2 min .
  • the sensitivity was designated by the relative value of the reciprocal of the exposure amount as required for obtaining the density comprising the minimum density plus 0.5.
  • the gradation was designated by the density difference between the sensitivity point and the point comprising the logarithm of the exposure amount (logE) plus 0.5.
  • Table 3 proves that the Photographic Light-Sensitive Material Sample (a) of the present invention is superior to the other Comparative Photographic Light-Sensitive Material Samples (b) through (d) in that the difference of the photographic properties(including relative sensitivity, gradation and maximum density) is small in Process (A) and Process (B) and thus the same result as in Process (A) can be attained even by Process (B) with no benzyl alcohol.
  • Samples (e), (f), (g) and (h) were prepared in the same manner as described for Samples (a), (b), (c) and (d), respectively, except that silver halide emulsions used for the first layer (blue-sensitive layer), the third layer (green-sensitive layer), and the fifth layer (red-sensitive layer) were a silver chlorobromide emulsion (silver bromide: 1 mol%, cubic shape, mean grain size: 1.0 ⁇ m), a silver chlorobromide emulsion (silver bromide: 1.5 mol%, cubic shape, mean grain size: 0.4 ⁇ m), and a silver chlorobromide emulsion (silver bromide: 1.5 mol%, cubic shape, mean grain size: 0.5 ⁇ m), respectively.
  • silver chlorobromide emulsion silver bromide: 1 mol%, cubic shape, mean grain size: 1.0 ⁇ m
  • a silver chlorobromide emulsion silver bromide:
  • Steps (C) and (D) were the same with the differentiation of only the use of Color Developer (C) or (D) in each step.
  • the evaluations of the photographic characteristics were made on two items of maximum density (Dmax) and minimum density (Dmin).
  • Table 4 proves that the Photographic Light-Sensitive Material Sample (e) of the present invention is superior to the other Comparative Photographic Light-Sensitive Material Samples (f) through (h) in that the coloring property is high and the difference of the photographic properties of Step (C) and that of Step (D) is small.

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Claims (28)

1. Verfahren zur Herstellung von Farbbildern, worin ein farbfotographisches Silberhalogenidmaterial mit mindestens einer Silberhalogenid-Emulsionsschicht auf einem reflektierenden Träger, die eine Dispersion oleophiler, feiner Körner, welche einen Kuppler enthält, der fähig ist, nach dem Kuppeln mit dem Oxidationsprodukt eines aromatischen, primären Aminentwicklungsmittels eine Farbe zu bilden, und mindestens ein hoch-siedendes organisches Lösungsmittel, ausgewählt aus der Gruppe, bestehend aus folgenden Formeln (I), (11), (III), (IV) und (V):
Figure imgb0157
Figure imgb0158
Figure imgb0159
Figure imgb0160
Figure imgb0161
enthält, worin W1, W2 und W3 jeweils eine substituierte oder unsubstituierte Alkyl-, Cycloalkyl-, Alkenyl- , Aryl- oder heterocyclische Gruppe darstellen; W4 W1, O-W1 oder S-W1 ist; n eine ganze Zahl von 1 bis 5 ist, und wenn n 2 oder mehr ist, W4 gleich oder verschieden sein kann; und in Formel (U) W1 und W2 so miteinander verbunden sein können, daß sie einen kondensierten Ring bilden; bildweise belichtet und dann mit einem Farbentwickler, der ein aromatisches, primäres Aminentwicklungsmittel, aber im wesentlichen keinen Benzylalkohol enthält, entwickelt wird, dadurch gekennzeichnet, daß die oleophilen, feinen Körner eine mittlere Korngröße von 0,25 um oder weniger haben, wobei die organischen Lösungsmittel eine Dielektrizitätskonstante von 4,0 oder mehr (25°C, 10 kHz) haben und das bildweise belichtete fotographische Material 2 Min 30 s lang oder weniger entwickelt wird.
2. Verfahren nach Anspruch 1, worin W1, W2 und W3 in den Formeln (I) bis (V) jeweils eine unsubstituierte Alkyl-, Cycloalkyl-, Alkenyl-, Aryl- oder heterocyclische Gruppe darstellen.
3. Verfahren nach Anspruch 1, worin W1, W2 und W3 in den Formeln (I) bis (V) jeweils eine Alkylgruppe, eine Cycloalkylgruppe, eine Alkenylgruppe, eine Arylgruppe oder eine heterocyclische Gruppe darstellen, die substituiert sind mit einem oder mehreren Substituenten mit einer oder mehreren Verbindungsgruppen, ausgewählt aus der Gruppe, bestehend aus -COO-, -CON ( , -R8 N ( und -O-, worin R8 eine divalente bis hexavalente Gruppe, die abgeleitet ist von einer Phenylgruppe durch Entfernung eines oder mehrerer Wasserstoffatome, darstellt.
4. Verfahren nach Anspruch 1, worin W1, W2, W3 oder W4 in den Formel (I) bis (V) eine lineare oder verzweigte Alkylgruppe darstellen, die wahlweise mit einem oder mehreren Substituenten, ausgewählt aus einem Halogenatom, einer Cycloalkylgruppe, einer Arylgruppe und einer Estergruppe, substituiert ist.
5. Verfahren nach Anspruch 1, worin W1 und W2 in der Formel (V) so miteinander verbunden sind, daß ein Oxiranring, ein Oxolanring oder ein Oxanring gebildet wird.
6. Verfahren nach Anspruch 1, worin die hoch-siedenden organischen Lösungsmittel der Formeln (I) bis (V) eine Dielektrizitätskonstante von 5,00 oder mehr bei 25°C, 10 kHz, und eine Viskosität von 20 mPa.s oder mehr bei 25°C aufweisen.
7. Verfahren nach Anspruch 1, worin eines oder mehrere hoch-siedende organische Lösungsmittel der Formeln (I) und (11) verwendet werden.
8. Verfahren nach Anspruch 1, worin das hoch-siedende organische Lösungsmittel der Formel (I) verwendet wird.
9. Verfahren nach Anspruch 1, worin die Konzentration des Benzylalkohols in dem Farbentwickler 0,5 ml/1 oder weniger beträgt.
10. Verfahren nach Anspruch 1, worin der Farbentwickler keinen Benzylalkohol enthält.
11. Verfahren nach Anspruch 1, worin die Farbentwicklungsdauer 1 bis 2 min beträgt.
12. Verfahren nach Anspruch 1, worin die oleophilen, feinen Körner eine mittlere Korngröße von 0,05 um bis 0,20 um aufweisen.
13. Verfahren nach Anspruch 1, worin der Farbentwickler eine alkalische, wäßrige Lösung ist, die hauptsächlich ein Farbentwicklungsmittel vom aromatischen, primären Amin-Typ umfaßt.
14. Verfahren nach Anspruch 1, worin die Verarbeitungstemperatur des Farbentwicklers 30 bis 50°C ist.
15. Verfahren nach Anspruch 1, worin die Verarbeitungstemperatur des Farbentwicklers 33 bis 45°C ist.
16. Verfahren nach Anspruch 12, worin das hoch-siedende organische Lösungsmittel der Formel (I) verwendet wird.
17. Verfahren nach Anspruch 12, worin der Farbentwickler keinen Benzylalkohol enthält.
18. Verfahren nach Anspruch 4, worin die Estergruppe eine 2-basische Säureestergruppe, eine von Laktat abgeleitete Gruppe, eine von Citrat abgeleitete Gruppe, eine von Malat abgeleitete Gruppe oder eine von Tartrat abgeleitete Gruppe und -CH2-C(COOC8H17)(OH)CH2COOC8H17 ist.
19. Verfahren nach Anspruch 1, worin das Gewichtsverhältnis des hoch-siedenden organischen Lösungsmittels zu dem Kuppler von 0,05/1 bis 20/1 beträgt.
20. Verfahren nach Anspruch 1, worin das farbfotographische Silberhalogenidmaterial weiterhin ein Alkalimetallhalogenid oder einen organischen Schleierinhibitor enthält.
21. Verfahren nach Anspruch 1, worin die SilberhalogenidEmulsionsschicht Silberhalogenidkörner kubischer oder tetradekaedrischer Kristallform enthält.
22. Verfahren nach Anspruch 1, worin die SilberhalogenidEmulsionsschicht eine Silberhalogenid-Emulsion mit einem Variationskoeffizienten von 20 % oder weniger enthält.
23. Verfahren nach Anspruch 22, worin der Variationskoeffizient 15 % oder weniger beträgt.
24. Verfahren nach Anspruch 1, worin die Silberhalogenid-Emulsionsschicht ein Silberchlorbromid mit von 20 bis 98 Mol% Silberbromidgehalt, aber im wesentlichen kein Jodid, enthält.
25. Verfahren nach Anspruch 1, worin die Silberhalogenid-Emulsionsschicht ein Silberchlorid oder ein Silberchlorbromid mit einem Silberchloridgehalt von mehr als 80 Mol% enthält.
26. Verfahren nach Anspruch 1, worin die Silberhalogenid-Emulsionsschicht eine Silberhalogenid-Emulsion, die hauptsächlich ein latentes Bild auf ihrer Oberfläche durch Belichtung bildet, enthält.
27. Verfahren nach Anspruch 1, worin das aromatische, primäre Aminentwicklungsmittel 3-Methyl-4-amino-N-ethyl-N-β-hydroxyethylanilin oder 3-Methyl-4-amino-N-ethyl-N-ß-methansulfonamidoethylanilinist.
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