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
  • 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
  • G03C7/392—Additives
  • G03C7/39208—Organic compounds
  • G03C7/39232—Organic compounds with an oxygen-containing function
• • 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
  • G03C7/392—Additives
  • G03C7/39208—Organic compounds
  • G03C7/39212—Carbocyclic
  • G03C7/39216—Carbocyclic with OH groups

Definitions

• the invention relates to a color photographic silver halide material with a reflective support and at least one blue-sensitive silver halide emulsion layer, the silver halide emulsion of which consists of at least 80 mol% of silver chloride, which is characterized by a steeper gradation gamma 1 and reduced fog.
• Color photographic silver halide material with a reflective support (color paper) on which the prints are made with the aid of the negative usually contains at least one blue-sensitive silver halide emulsion layer with at least one yellow coupler, at least one green-sensitive silver halide emulsion layer with at least one magenta coupler and at least one red-sensitive silver halide emulsion layer with at least one cyan. More and more emulsions for color paper are used with a very high proportion of silver chloride, since these can be developed much faster compared to conventional emulsions, which contain predominantly silver bromide.
• the process for the conventional materials is set to a development time of 195 seconds, the development process (RA-4 process) for the high-chloride emulsions to 45 seconds.
• the emulsions containing high chloride in particular in the yellow area, cause an increase in the haze and a flattening of the light gradation (gamma 1).
• the object of the invention was therefore to find measures to eliminate these disadvantages and thus to be able to better utilize the advantages of the chloride emulsions.
• the invention therefore relates to the material mentioned at the outset, which contains at least one compound of the formula in the at least one blue-sensitive silver halide emulsion layer with a silver chloride content of at least 80 mol% in addition to a yellow coupler XL-OH (I) contains what X -OH or a further substituted nitrogen atom, preferably of the formula L is a bridge member with 2 or 3 carbon atoms.
• Compound I preferably contains at least one acid group, for example a sulfonic acid group, but in particular a carboxylic acid group.
• the OH groups can be part of carboxylic acid groups.
• R1 is in particular an optionally substituted C1-C4 alkyl radical or, together with R2 and a carbon atom of the bridge member, the remaining members of a heteroaromatic ring with 5 to 10 C atoms, which may be further substituted, e.g. by sulfonic acid or carboxylic acid groups.
• R2 is in particular hydrogen, an optionally substituted alkyl radical or, together with a carbon atom of the bridge member, the remaining members of a heteroatomic ring.
• R1 represents the radical -CH2-COOH.
• Suitable bridge members are, for example wherein R3 together with the nitrogen atom is the double bonded radical of an optionally substituted heteroaromatic 5- or 6-ring and R4, R5, R6 the double bonded radical of an aromatic or heteroaromatic 6- to 10-membered ring system, which is optionally further substituted.
• the compounds of formula I are used in an amount of 10 ⁇ 5 to 10 ⁇ 1 ⁇ mol / mol silver halide of the layer in question, preferably from 10 ⁇ 3 to 10 ⁇ 2 ⁇ mol / mol silver halide.
• All light-sensitive silver halide emulsion layers preferably contain silver halides with at least 80 mol% AgCl, preferably at least 95 mol% AgCl.
• Suitable reflective supports are preferably paper laminated with a baryta layer or ⁇ -olefin polymer layer (e.g. polyethylene).
• the color photographic materials usually contain at least one red-sensitive, green-sensitive and blue-sensitive silver halide emulsion layer and, if necessary, intermediate layers and protective layers.
• Binding agents, silver halide grains and color couplers are essential components of the photographic emulsion layers.
• Gelatin is preferably used as the binder. However, this can be replaced in whole or in part by other synthetic, semi-synthetic or naturally occurring polymers.
• Synthetic gelatin substitutes are, for example, polyvinyl alcohol, poly-N-vinylpyrrolidone, polyacrylamides, polyacrylic acid and their derivatives, in particular their copolymers.
• Naturally occurring gelatin substitutes are, for example, other proteins such as albumin or casein, cellulose, sugar, starch or alginates.
• Semi-synthetic gelatin substitutes are usually modified natural products.
• cellulose derivatives such as hydroxyalkyl cellulose, carboxymethyl cellulose and phthalyl cellulose and gelatin derivatives which have been obtained by reaction with alkylating or acylating agents or by grafting on polymerizable monomers.
• the binders should have a sufficient amount of functional groups so that enough resistant layers can be produced by reaction with suitable hardening agents.
• Such function Light groups are in particular amino groups, but also carboxyl groups, hydroxyl groups and active methylene groups.
• the gelatin which is preferably used can be obtained by acidic or alkaline digestion. Oxidized gelatin can also be used. The production of such gelatins is described, for example, in The Science and Technology of Gelatine, published by A.G. Ward and A. Courts, Academic Press 1977, page 295 ff.
• the gelatin used in each case should contain the lowest possible level of photographically active impurities (inert gelatin). High viscosity, low swelling gelatins are particularly advantageous.
• the emulsions contain at least 80 mol%, preferably at least 95 mol% AgCl and also 0 to 20 mol% AgBr and 0 to 5 mol% AgI, preferably 0 to 5 mol% AgBr and 0 to 1 Mol% AgI.
• the crystals can be predominantly compact, which are, for example, regularly cubic or octahedral or can have transitional forms.
• platelet-shaped crystals can preferably also be present, the average ratio of diameter to thickness of which is preferably at least 5: 1, the diameter of a grain being defined as the diameter of a circle with a circle content corresponding to the projected area of the grain.
• the layers can also have tabular silver halide crystals, where the ratio of diameter to thickness is significantly greater than 5: 1, e.g. 12: 1 to 30: 1.
• the silver halide grains can also have a multi-layered grain structure, in the simplest case with an inner and an outer grain area (core / shell), the halide composition and / or other modifications, such as e.g. Doping of the individual grain areas are different.
• the average grain size of the emulsions is preferably between 0.2 ⁇ m and 2.0 ⁇ m, the grain size distribution can be both homo- and heterodisperse. Homodisperse grain size distribution means that 95% of the grains do not deviate from the mean grain size by more than ⁇ 30%.
• the emulsions can also contain organic silver salts, e.g. Silver benzotriazolate or silver behenate.
• Two or more kinds of silver halide emulsions, which are prepared separately, can be used as a mixture.
• the photographic emulsions can be prepared using various methods (e.g. P. Glafkides, Chimie et Physique Photographique, Paul Montel, Paris (1967), GF Duffin, Photographic Emulsion Chemistry, The Focal Press, London (1966), VL Zelikman et al, Making and Coating Photographic Emulsion, The Focal Press, London (1966) from soluble silver salts and soluble halides.
• various methods e.g. P. Glafkides, Chimie et Physique Photographique, Paul Montel, Paris (1967), GF Duffin, Photographic Emulsion Chemistry, The Focal Press, London (1966), VL Zelikman et al, Making and Coating Photographic Emulsion, The Focal Press, London (1966) from soluble silver salts and soluble halides.
• the silver halide is preferably precipitated in the presence of the binder, for example the gelatin, and can be carried out in the acidic, neutral or alkaline pH range, silver halide complexing agents preferably being additionally used.
• the latter include, for example, ammonia, thioether, imidazole, ammonium thiocyanate or excess halide.
• the water-soluble silver salts and the halides are combined either in succession by the single-jet process or simultaneously by the double-jet process or by any combination of the two processes. Dosing with increasing inflow rates is preferred, the "critical" feed rate, at which no new germs are being produced, should not be exceeded.
• the pAg range can vary within wide limits during the precipitation, preferably the so-called pAg-controlled method is used, in which a certain pAg value is kept constant or a defined pAg profile is traversed during the precipitation.
• so-called inverse precipitation with an excess of silver ions is also possible.
• the silver halide crystals can also grow through physical ripening (Ostwald ripening), in the presence of excess halide and / or silver halide complexing agent. The growth of the emulsion grains can even take place predominantly by Ostwald ripening, a fine-grained, so-called Lippmann emulsion preferably being mixed with a less soluble emulsion and being redissolved on the latter.
• Salts or complexes of metals such as Cd, Zn, Pb, Tl, Bi, Ir, Rh, Fe can also be present during the precipitation and / or physical ripening of the silver halide grains.
• the precipitation can also be carried out in the presence of sensitizing dyes.
• Complexing agents and / or dyes can be rendered ineffective at any time, e.g. by changing the pH or by an oxidative treatment.
• the soluble salts are removed from the emulsion, e.g. by pasta and washing, by flakes and washing, by ultrafiltration or by ion exchangers.
• the silver halide emulsion is generally subjected to chemical sensitization under defined conditions - pH, pAg, temperature, gelatin, silver halide and sensitizer concentration - until the optimum sensitivity and fog are reached.
• the procedure is e.g. described by H. Frieser "The basics of photographic processes with silver halides" page 675-734, Akademische Verlagsgesellschaft (1968).
• Chemical sensitization with the addition of compounds of sulfur, selenium, tellurium and / or metal compounds of, for example, gold, platinum, palladium, Iridium can occur, thiocyanate compounds, surface-active compounds such as thioethers, heterocyclic nitrogen compounds (eg imidazoles, azaindenes) or spectral sensitizers (described, for example, by F. Hamer "The Cyanine Dyes and Related Compounds", 1964, or Ullman's Encyclopedia of Industrial Chemistry) , 4th edition, vol. 18, p. 431 ff. And Research Disclosure No. 17643, section III).
• a reduction sensitization with the addition of reducing agents can be carried out by hydrogen, by low pAg (eg less than 5) and / or high pH (eg above 8) .
• the photographic emulsions may contain compounds to prevent fogging or to stabilize the photographic function during production, storage or photographic processing.
• Azaindenes are particularly suitable, preferably tetra- and penta-azaindenes, in particular those which are substituted by hydroxyl or amino groups. Such connections are for example from Birr, Z. Wiss. Phot. 47 (1952), pp. 2-58. Salts of metals such as mercury or cadmium, aromatic sulfonic or sulfinic acids such as benzenesulfinic acid, or nitrogen-containing heterocycles can also be used as antifoggants such as nitrobenzimidazole, nitroindazole, optionally substituted benzotriazoles or benzthiazolium salts.
• metals such as mercury or cadmium, aromatic sulfonic or sulfinic acids such as benzenesulfinic acid, or nitrogen-containing heterocycles
• antifoggants such as nitrobenzimidazole, nitroindazole, optionally substituted benzotriazoles or benzthiazolium salts.
• Heterocycles containing mercapto groups for example mercaptobenzthiazoles, mercaptobenzimidazoles, mercaptotetrazoles, mercaptothiadiazoles, mercaptopyrimidines, are particularly suitable, these mercaptoazoles also being able to contain a water-solubilizing group, for example a carboxyl group or sulfo group.
• mercaptobenzthiazoles for example mercaptobenzthiazoles, mercaptobenzimidazoles, mercaptotetrazoles, mercaptothiadiazoles, mercaptopyrimidines
• these mercaptoazoles also being able to contain a water-solubilizing group, for example a carboxyl group or sulfo group.
• a water-solubilizing group for example a carboxyl group or sulfo group.
• the stabilizers can be added to the silver halide emulsions before, during or after their ripening.
• the compounds can also be added to other photographic layers which are assigned to a halogen silver layer.
• the photographic emulsion layers or other hydrophilic colloid layers of the light-sensitive material produced according to the invention can contain surface-active agents for various purposes, such as coating aids, to prevent electrical charging, to improve the sliding properties, to emulsify the dispersion, to prevent adhesion and to improve the photographic characteristics (eg acceleration of development, high contrast, sensitization etc.).
• non-ionic surfactants for example alkylene oxide compounds, glycerol compounds or glycidol compounds
• cationic surfactants for example higher alkylamines, quaternary ammonium salts, pyridine compounds and other heterocyclic compounds
• sulfonium compounds or phosphonium compounds anionic surfactants, containing an acid group, for example carboxylic acid, sulfonic acid, a phosphoric acid, sulfuric acid ester or phosphoric acid ester group
• ampholytic surfactants for example amino acid and aminosulfonic acid compounds and sulfur or phosphoric acid esters of an amino alcohol.
• the photographic emulsions can be spectrally sensitized using methine dyes or other dyes.
• Particularly suitable dyes are cyanine dyes, merocyanine dyes and complex merocyanine dyes.
• 9-ethylcarbocyanines with benzthiazole, benzselenazole or naphthothiazole as basic end groups the can be substituted in the 5- and / or 6-position by halogen, methyl, methoxy, carbalkoxy, aryl and 9-ethyl-naphthoxathia or -selenecarbocyanine and 9-ethyl-naphthothiaoxa- or - benzimidazocarbocyanine, provided that the dyes carry at least one sulfoalkyl group on the heterocyclic nitrogen.
• the differently sensitized emulsion layers are assigned non-diffusing monomeric or polymeric color couplers, which can be located in the same layer or in a layer adjacent to it.
• the red-sensitive layers usually turn blue green couplers, the green-sensitive layers of purple couplers and the blue-sensitive layers of yellow couplers.
• Color couplers for producing the purple partial color image are generally couplers of the 5-pyrazolone, indazolone or pyrazoloazole type; suitable examples are
• Color couplers for generating the yellow partial color image are generally couplers with an open-chain ketomethylene grouping, in particular couplers of the ⁇ -acylacetamide type; suitable examples of this are ⁇ -benzoylacetanilide couplers and ⁇ -pivaloylacetanilide couplers of the formulas
• the color couplers can be 4-equivalent couplers, but also 2-equivalent couplers.
• the latter are derived from the 4-equivalent couplers in that they contain a substituent in the coupling site which is split off during the coupling.
• the 2-equivalent couplers include those which are colorless, and also white couplers which, when reacted with color developer oxidation products, essentially give colorless products.
• white couplers are:
• High molecular weight color couplers are described, for example, in DE-C-1 297 417, DE-A-24 07 569, DE-A-31 48 125, DE-A-32 17 200, DE-A-33 20 079, DE-A-33 24 932, DE-A-33 31 743, DE-A-33 40 376, EP-A-27 284, US-A-4 080 211.
• the high molecular weight color couplers are usually produced by polymerizing ethylenically unsaturated monomeric color couplers. You can but can also be obtained by polyaddition or polycondensation.
• the couplers or other compounds can be incorporated into silver halide emulsion layers by first preparing a solution, a dispersion or an emulsion from the compound in question and then adding it to the casting solution for the layer in question.
• the selection of the suitable solvent or dispersing agent depends on the solubility of the compound.
• Hydrophobic compounds can also be introduced into the casting solution using high-boiling solvents, so-called oil formers. Corresponding methods are described for example in US-A-2 322 027, US-A-2 801 170, US-A-2 801 171 and EP-A-O 043 037.
• oligomers or polymers instead of the high-boiling solvents, oligomers or polymers, so-called polymeric oil formers, can be used.
• the compounds can also be introduced into the casting solution in the form of loaded latices.
• anionic water-soluble compounds e.g. dyes
• pickling polymers e.g. acrylic acid
• Suitable oil formers are e.g. Alkyl phthalates, phosphonic acid esters, phosphoric acid esters, citric acid esters, benzoic acid esters, amides, fatty acid esters, trimesic acid esters, alcohols, phenols, aniline derivatives and hydrocarbons.
• oil formers examples include dibutyl phthalate, dicyclohexyl phthalate, di-2-ethylhexyl phthalate, decyl phthalate, triphenyl phosphate, tricresyl phosphate, 2-ethylhexyl diphenyl phosphate, tricyclohexyl phosphate, tri-2-ethylhexyl phosphate, tridecoxy phosphate, 2-ethylhexyl phosphate, tridecoxy phosphate, 2-ethylhexyl phylate, , 2-ethylhexyl p-hydroxybenzoate, diethyldodecanamide, N-tetradecylpyrrolidone, isostearyl alcohol, 2,4-di-tert-amylphenol, dioctyl acylate, glycerol tributyrate, isostearyl lactate, trioctyl citrate, N,
• the non-light-sensitive intermediate layers which are generally arranged between layers of different spectral sensitivity, can contain agents which prevent undesired diffusion of developer oxidation products from one light-sensitive layer into another light-sensitive layer with different spectral sensitization.
• Suitable agents which are also called scavengers, are described in Research Disclosure 17 643 (Dec. 1978), Chapter VII, 17 842/1979, pages 94-97 and 18.716 / 1979, page 650 and in EP-A-69 070, 98 072, 124 877, 125 522 and in US-A-463 226.
• the photographic material can also contain UV light-absorbing compounds, whiteners, spacers, light stabilizers, antioxidants, D Min dyes, additives to improve dye, coupler and white stabilization and to reduce the color fog, plasticizers (latices), biocides and others .
• Compounds that absorb UV light are intended to protect the image dyes from fading by UV-rich daylight.
• Examples are aryl-substituted benzotriazole compounds (US-A-3 533 794), 4-thiazolidone compounds (US-A-3 314 794 and 3 352 681), benzophenone compounds (JP-A-2784/71), cinnamic acid ester compounds (US-A-3 705 805 and 3,707,375), butadiene compounds (US-A-4,045,229) or benzoxazole compounds (US-A-3,700,455).
• Ultraviolet absorbing couplers such as ⁇ -naphthol type cyan couplers
• ultraviolet absorbing polymers can also be used. These ultraviolet absorbents can be fixed in a special layer by pickling.
• Suitable whiteners are described, for example, in Research Disclosure 17,643 (Dec. 1978), Chapter V, in US-A-2,632,701, 3,269,840 and in GB-A-852,075 and 1,319,763.
• binder layers in particular the most distant layer from the support, but also occasionally intermediate layers, especially if they are the most distant layer from the support during manufacture, may contain photographically inert particles of inorganic or organic nature, e.g. as a matting agent or as a spacer (DE-A-33 31 542, DE-A-34 24 893, Research Disclosure 17 643, (Dec. 1978), Chapter XVI).
• photographically inert particles of inorganic or organic nature e.g. as a matting agent or as a spacer (DE-A-33 31 542, DE-A-34 24 893, Research Disclosure 17 643, (Dec. 1978), Chapter XVI).
• the average particle diameter of the spacers is in particular in the range from 0.2 to 10 ⁇ m.
• the spacers are water-insoluble and can be alkali-insoluble or alkali-soluble, the alkali-soluble ones generally being removed from the photographic material in the alkaline development bath.
• suitable polymers are polymethyl methacrylate, copolymers of acrylic acid and methyl methacrylate and hydroxypropyl methyl cellulose hexahydrophthalate.
• Additives to improve dye, coupler and whiteness stability and to reduce the color haze can belong to the following chemical substance classes: hydroquinones, 6-hydroxychromanes, 5-hydroxycoumarans, spirochromans, spiroindanes, p- Alkoxyphenols, sterically hindered phenols, gallic acid derivatives, methylenedioxybenzenes, aminophenols, sterically hindered amines, derivatives with esterified or etherified phenolic hydroxyl groups, metal complexes.
• the layers of the photographic material can be hardened with the usual hardening agents.
• Suitable curing agents are, for example, formaldehyde, glutaraldehyde and similar aldehyde compounds, diacetyl, cyclopentadione and similar ketone compounds, bis (2-chloroethyl urea), 2-hydroxy-4,6-dichloro-1,3,5-triazine and other compounds, the reactive halogen contain (US-A-3 288 775, US-A-2 732 303, GB-A-974 723 and GB-A-1 167 207) divinyl sulfone compounds, 5-acetyl-1,3-di-acryloylhexahydro-1,3 , 5-triazine and other compounds containing a reactive olefin bond (US-A-3 635 718, US-A-3 232 763 and GB-A-994 869); N-hydroxymethylphthalimide and other N-methylol compounds (US-
• the hardening can be effected in a known manner by adding the hardening agent to the casting solution for the layer to be hardened or by overlaying the layer to be hardened with a layer which contains a diffusible hardening agent.
• Immediate hardeners are understood to mean compounds which crosslink suitable binders in such a way that the hardening is completed to such an extent immediately after casting, at the latest after 24 hours, preferably at the latest after 8 hours, that no further change in the sensitometry caused by the crosslinking reaction and the swelling of the layer structure occurs .
• Swelling is understood to mean the difference between the wet film thickness and the dry film thickness during the aqueous processing of the film (Photogr. Sci., Eng. 8 (1964), 275; Photogr. Sci. Eng. (1972), 449).
• hardening agents which react very quickly with gelatin are, for example, carbamoylpyridinium salts which are able to react with free carboxyl groups of the gelatin, so that the latter react with free amino groups of the gelatin with the formation of peptide bonds and crosslinking of the gelatin.
• Suitable examples of instant hardeners are, for example, compounds of the general formulas wherein R1 denotes alkyl, aryl or aralkyl, R2 has the same meaning as R1 or means alkylene, arylene, aralkylene or alkaralkylene, the second bond having a group of the formula is linked or R1 and R2 together represent the atoms required to complete an optionally substituted heterocyclic ring, for example a piperidine, piperazine or morpholine ring, which ring can be substituted, for example, by C1-C3alkyl or halogen, R3 for hydrogen, alkyl, aryl, alkoxy, -NR4-COR5, - (CH2) m -NR8R9, - (CH2) n -CONR13R14 or or a bridge link or a direct bond to a polymer chain, wherein R4, R6, R7, R9, R14, R15, R17, R18, and R19 are hydrogen or
• Color photographic negative materials are usually processed by developing, bleaching, fixing and washing or by developing, bleaching, fixing and stabilizing without subsequent washing, whereby bleaching and fixing can be combined into one processing step.
• All developer compounds which have the ability to react in the form of their oxidation product with color couplers to form azomethine or indophenol dyes can be used as the color developer compound.
• Suitable color developer compounds are aromatic compounds of the p-phenylenediamine type containing at least one primary amino group, for example N, N-dialkyl-p-phenylenediamines such as N, N-diethyl-p-phenylenediamine, 1- (N-ethyl-N-methanesulfonamidoethyl) -3 -methyl-p-phenylenediamine, 1- (N-ethyl-N-hydroxyethyl) -3-methyl-p-phenylenediamine and 1- (N-ethyl-N-methoxyethyl) -3-methyl-p-phenylenediamine.
• Further useful color developers are described, for example, in J. Amer. Chem. Soc. 73 , 3106 (1951) and G. Haist, Modern Photographic Processing, 1979, John Wiley and Sons, New York, page 545 ff.
• the material is bleached and fixed immediately after color development.
• bleaching agents e.g. Fe (III) salts and Fe (III) complex salts such as ferricyanides, dichromates, water-soluble cobalt complexes can be used.
• Iron (III) complexes of aminopolycarboxylic acids are particularly preferred, especially e.g. of ethylenediaminetetraacetic acid, propylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid, nitrilotriacetic acid, iminodiacetic acid, N-hydroxyethylethylenediaminetriacetic acid, alkyliminodicarboxylic acids and corresponding phosphonic acids.
• Persulphates and peroxides e.g. Hydrogen peroxide.
• the bleach-fixing bath or fixing bath is usually followed by washing, which is designed as countercurrent washing or consists of several tanks with their own water supply.
• the washing can be completely replaced by a stabilizing bath, which is usually carried out in countercurrent.
• this stabilizing bath also functions as a final bath.
• a color photographic recording material was produced by applying the following layers in the order given to a support made of paper coated on both sides with polyethylene.
• the quantities given relate to 1 m2.
• the corresponding amounts of AgNO3 are given.
• layer structure 1 layer structure 1, but additionally with a compound formula I (according to the blue-sensitive layer) according to the following table.
• the veil and gradation G 1 (light gradation) of the samples were determined fresh and after the casting solutions had been digested for 24 hours at 40 ° C.
• the processing was carried out according to the RA-4 process.
• Construction connection amount Veil behind blue filter Gradation G 1 (mg) 0 h 24 hours 0 h 24 hours 1 - - 0.121 0.154 1.85 1.78 2nd K 1 3rd 0.117 0.136 1.85 1.81 3rd K 2 4th 0.120 0.131 1.85 1.82 4th K 3 3rd 0.120 0.136 1.81 1.79 5 K 4 4th 0.121 1,137 1.81 1.79 6 K 5 5 0.121 0.145 1.82 1.79 7 K 6 4th 0.120 0.147 1.85 1.83 8th K 7 4th 0.120 0.147 1.86 1.82 9 K 8 5 0.123 0.137 1.87 1.86
• the table shows that the addition of the substances according to the invention causes a significantly lower increase in fog after 24-hour digestion and a lower decrease in the light gradation (threshold gradation G 1).

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• 1988
  • 1988-10-01 DE DE19883833387 patent/DE3833387A1/de not_active Withdrawn
• 1989
  • 1989-09-16 EP EP89117176A patent/EP0362604A3/de not_active Withdrawn
  • 1989-09-28 JP JP25082689A patent/JPH02123351A/ja active Pending

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