US3779776A - Fogged, direct-positive silver halide emulsion containing a color coupler and a heterocyclic mercaptan desensitizer - Google Patents
Fogged, direct-positive silver halide emulsion containing a color coupler and a heterocyclic mercaptan desensitizer Download PDFInfo
- Publication number
- US3779776A US3779776A US00269861A US3779776DA US3779776A US 3779776 A US3779776 A US 3779776A US 00269861 A US00269861 A US 00269861A US 3779776D A US3779776D A US 3779776DA US 3779776 A US3779776 A US 3779776A
- Authority
- US
- United States
- Prior art keywords
- direct
- silver halide
- element according
- positive
- photographic element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- -1 silver halide Chemical class 0.000 title claims abstract description 69
- 229910052709 silver Inorganic materials 0.000 title claims abstract description 62
- 239000004332 silver Substances 0.000 title claims abstract description 62
- 239000000839 emulsion Substances 0.000 title claims abstract description 29
- 229940090898 Desensitizer Drugs 0.000 title description 5
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 title description 3
- 125000000623 heterocyclic group Chemical group 0.000 title 1
- 239000003975 dentin desensitizing agent Substances 0.000 claims abstract description 34
- 125000000217 alkyl group Chemical group 0.000 claims abstract description 16
- 239000002243 precursor Substances 0.000 claims abstract description 13
- 125000003118 aryl group Chemical group 0.000 claims abstract description 12
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 6
- 150000001875 compounds Chemical class 0.000 claims description 13
- 239000003638 chemical reducing agent Substances 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 125000003710 aryl alkyl group Chemical group 0.000 claims description 6
- 150000002344 gold compounds Chemical class 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- RYYXDZDBXNUPOG-UHFFFAOYSA-N 4,5,6,7-tetrahydro-1,3-benzothiazole-2,6-diamine;dihydrochloride Chemical group Cl.Cl.C1C(N)CCC2=C1SC(N)=N2 RYYXDZDBXNUPOG-UHFFFAOYSA-N 0.000 claims description 5
- 230000029087 digestion Effects 0.000 claims description 5
- 230000001376 precipitating effect Effects 0.000 claims description 5
- 230000005855 radiation Effects 0.000 claims description 4
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims description 3
- 125000005331 diazinyl group Chemical group N1=NC(=CC=C1)* 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- KZTYYGOKRVBIMI-UHFFFAOYSA-N S-phenyl benzenesulfonothioate Natural products C=1C=CC=CC=1S(=O)(=O)C1=CC=CC=C1 KZTYYGOKRVBIMI-UHFFFAOYSA-N 0.000 abstract description 6
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 abstract description 6
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 3
- 239000001257 hydrogen Substances 0.000 abstract description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract description 3
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 abstract description 3
- 125000006527 (C1-C5) alkyl group Chemical group 0.000 abstract 2
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 4
- ZXQHSPWBYMLHLB-BXTVWIJMSA-M 6-ethoxy-1-methyl-2-[(e)-2-(3-nitrophenyl)ethenyl]quinolin-1-ium;methyl sulfate Chemical compound COS([O-])(=O)=O.C1=CC2=CC(OCC)=CC=C2[N+](C)=C1\C=C\C1=CC=CC([N+]([O-])=O)=C1 ZXQHSPWBYMLHLB-BXTVWIJMSA-M 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 238000003795 desorption Methods 0.000 description 3
- 239000000975 dye Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 108010010803 Gelatin Proteins 0.000 description 2
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- WGQKYBSKWIADBV-UHFFFAOYSA-N benzylamine Chemical compound NCC1=CC=CC=C1 WGQKYBSKWIADBV-UHFFFAOYSA-N 0.000 description 2
- 229920002301 cellulose acetate Polymers 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 239000008273 gelatin Substances 0.000 description 2
- 229920000159 gelatin Polymers 0.000 description 2
- 235000019322 gelatine Nutrition 0.000 description 2
- 235000011852 gelatine desserts Nutrition 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000001235 sensitizing effect Effects 0.000 description 2
- ZUNKMNLKJXRCDM-UHFFFAOYSA-N silver bromoiodide Chemical compound [Ag].IBr ZUNKMNLKJXRCDM-UHFFFAOYSA-N 0.000 description 2
- LUMLZKVIXLWTCI-NSCUHMNNSA-N (e)-2,3-dichloro-4-oxobut-2-enoic acid Chemical compound OC(=O)C(\Cl)=C(/Cl)C=O LUMLZKVIXLWTCI-NSCUHMNNSA-N 0.000 description 1
- CBCKQZAAMUWICA-UHFFFAOYSA-N 1,4-phenylenediamine Chemical compound NC1=CC=C(N)C=C1 CBCKQZAAMUWICA-UHFFFAOYSA-N 0.000 description 1
- KJCVRFUGPWSIIH-UHFFFAOYSA-N 1-naphthol Chemical compound C1=CC=C2C(O)=CC=CC2=C1 KJCVRFUGPWSIIH-UHFFFAOYSA-N 0.000 description 1
- GOJUJUVQIVIZAV-UHFFFAOYSA-N 2-amino-4,6-dichloropyrimidine-5-carbaldehyde Chemical group NC1=NC(Cl)=C(C=O)C(Cl)=N1 GOJUJUVQIVIZAV-UHFFFAOYSA-N 0.000 description 1
- XRZDIHADHZSFBB-UHFFFAOYSA-N 3-oxo-n,3-diphenylpropanamide Chemical compound C=1C=CC=CC=1NC(=O)CC(=O)C1=CC=CC=C1 XRZDIHADHZSFBB-UHFFFAOYSA-N 0.000 description 1
- XBTWVJKPQPQTDW-UHFFFAOYSA-N 4-n,4-n-diethyl-2-methylbenzene-1,4-diamine Chemical compound CCN(CC)C1=CC=C(N)C(C)=C1 XBTWVJKPQPQTDW-UHFFFAOYSA-N 0.000 description 1
- 229920001817 Agar Polymers 0.000 description 1
- 102000009027 Albumins Human genes 0.000 description 1
- 108010088751 Albumins Proteins 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- PNKUSGQVOMIXLU-UHFFFAOYSA-N Formamidine Chemical compound NC=N PNKUSGQVOMIXLU-UHFFFAOYSA-N 0.000 description 1
- 241000206672 Gelidium Species 0.000 description 1
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical compound ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 206010070834 Sensitisation Diseases 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- 229920002494 Zein Polymers 0.000 description 1
- SJOOOZPMQAWAOP-UHFFFAOYSA-N [Ag].BrCl Chemical compound [Ag].BrCl SJOOOZPMQAWAOP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 235000010419 agar Nutrition 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 235000010323 ascorbic acid Nutrition 0.000 description 1
- 229960005070 ascorbic acid Drugs 0.000 description 1
- 239000011668 ascorbic acid Substances 0.000 description 1
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 1
- 229910001864 baryta Inorganic materials 0.000 description 1
- IYMAUEAFOBSGCY-UHFFFAOYSA-N benzene;sulfurochloridic acid Chemical compound OS(Cl)(=O)=O.C1=CC=CC=C1 IYMAUEAFOBSGCY-UHFFFAOYSA-N 0.000 description 1
- PASDCCFISLVPSO-UHFFFAOYSA-N benzoyl chloride Chemical compound ClC(=O)C1=CC=CC=C1 PASDCCFISLVPSO-UHFFFAOYSA-N 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 229920006217 cellulose acetate butyrate Polymers 0.000 description 1
- 229920003086 cellulose ether Polymers 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- XMBWDFGMSWQBCA-UHFFFAOYSA-N hydrogen iodide Chemical compound I XMBWDFGMSWQBCA-UHFFFAOYSA-N 0.000 description 1
- LOCAIGRSOJUCTB-UHFFFAOYSA-N indazol-3-one Chemical compound C1=CC=C2C(=O)N=NC2=C1 LOCAIGRSOJUCTB-UHFFFAOYSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052741 iridium Inorganic materials 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 1
- ZAKLKBFCSHJIRI-UHFFFAOYSA-N mucochloric acid Natural products OC1OC(=O)C(Cl)=C1Cl ZAKLKBFCSHJIRI-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 150000004714 phosphonium salts Chemical class 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 235000019422 polyvinyl alcohol Nutrition 0.000 description 1
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 1
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 1
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- JEXVQSWXXUJEMA-UHFFFAOYSA-N pyrazol-3-one Chemical compound O=C1C=CN=N1 JEXVQSWXXUJEMA-UHFFFAOYSA-N 0.000 description 1
- AOJFQRQNPXYVLM-UHFFFAOYSA-N pyridin-1-ium;chloride Chemical compound [Cl-].C1=CC=[NH+]C=C1 AOJFQRQNPXYVLM-UHFFFAOYSA-N 0.000 description 1
- KIWUVOGUEXMXSV-UHFFFAOYSA-N rhodanine Chemical compound O=C1CSC(=S)N1 KIWUVOGUEXMXSV-UHFFFAOYSA-N 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000008313 sensitization Effects 0.000 description 1
- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 125000005504 styryl group Chemical group 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
- 239000005019 zein Substances 0.000 description 1
- 229940093612 zein Drugs 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C1/00—Photosensitive materials
- G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
- G03C1/485—Direct positive emulsions
- G03C1/48515—Direct positive emulsions prefogged
- G03C1/48523—Direct positive emulsions prefogged characterised by the desensitiser
Definitions
- R is hydrogen or C -C alkyl
- n 1, 2, or 3.
- the desensitizing agents are highly compatible with color couplers.
- the above desensitizing agents were found to be fully compatible with color couplers in that they favourably resist desorption from the silver halide grains by color forming couplers.
- a direct-positive photographic emulsion comprising fogged silver halide grains, a colorforming coupler and a desensitizing agent corresponding to one of the above general formulae, a corresponding disulphide thereof or such desensitizing agent precursor compound.
- the present invention further provides a method of producing direct-positive color images, which method comprises image-wise exposing a direct-positive element having prefogged silver halide grains and comprising a desensitizing agent according to one of the above general formulae, a corresponding disulphide thereof or such desensitizing agent precursor compound, and developing said element by means of an aromatic primary amino color developing agent in the presence of a co1orforming coupler.
- the amount of desensitizing compounds used according to the present invention may vary within very wide limits. They are preferably used in amounts ranging from about mg to about 2 g per mole of silver halide.
- color-forming couplers include cyan-forming color couplers of the phenol or naphthol type, magenta forming color couplers of the pyrazolone or indazolone type and yellow forming open-chain reactive methylene compounds containing the COCH -CO group, e.g., benzoylacetanilide couplers. They include polymeric as well as non-polymeric color couplers.
- the color-forming couplers can be incorporated into the direct-positive photographic silver halide emulsion any suitable technique, e.g., from aqueous alkaline solutions or by techniques of the type shown in US. Pat. Nos. 2,186,849 of Gustave Wilmanns, Kreis Bitterfield, Karl Kumetat, Alfred Friihlich, Wilhelm Scheider and Richard Brodersen issued Jan. 9, 1940; 2,269,158 of Michele Martinez issued Jan. 6, 1942; 2,284,887 of Emil Vollenweider issued June 2, 1942; 2,304,939 of Emil Vollenweider issued Dec. 15, 1942; 2,304,940 of Leopold D.Mannes and Leopold Godowsky Jr. issued Dec.
- tion is not critical and may consist of any of the known silver halides suitable for the formation of directpositive silver halide emulsions, e.g., silver bromide, silver chloride, silver chlorobromide, silver bromoiodide and silver chlorobromoiodide.
- Especially suitable for use according to the present invention are direct-positive silver halide emulsions, the silver halide grains of which have an average grain size of less than about 1 micron.
- the silver halide grains may be regular and have one of the commonly known shapes, e.g., cubic, octahedral or rhombohedral as described in British Pat. Application No. 14,224/71 filed May 1 l, 1971 by Gevaert-Agfa N.V. They preferably have a substantially uniform diameter.
- Fogging of the silver halide emulsions may occur by exposure before or after coating of the emulsion, to actinic radiation but preferably fogging occurs by chemical means.
- Chemical fogging can be effected by chemical sensitization to fog and any of the usual chemical sensitizing methods may be used.
- Fogging can be effected successfully by means of reducing agents, e.g., hydrazine, hydroxylamine, tin(ll) salts such as tin(ll) chloride, ascorbic acid, formaldehyde, thiourea dioxide also called formamidine sulphinic acid, polyamines, phosphonium salts etc.
- the direct positive silver halide emulsions may further comprise all kinds of known emulsion ingredients, e.g., wetting agents, development accelerators, optical brightening agents, hardeners, such as formaldehyde and mucochloric acid, stabilizers, spectral sensitizing dyes, which include cyanines, meroeyanines, complex (trinuclear) cyanines, complex (trinuclear) meroeyanines, styryls, and hemicyanines, etc.
- known emulsion ingredients e.g., wetting agents, development accelerators, optical brightening agents, hardeners, such as formaldehyde and mucochloric acid, stabilizers, spectral sensitizing dyes, which include cyanines, meroeyanines, complex (trinuclear) cyanines, complex (trinuclear) meroeyanines, styryls, and hemicyanines, etc.
- Gelatin is preferably used as a vehicle for the silver halide but like in other silver halide emulsions the gelatin may be replaced wholly or partly by other hydrophilic colloids, e.g., colloidal albumin, zein, agar-agar, polyvinyl alcohol, polyvinyl pyrrolidone, cellulose ethers, partly hydrolyzed cellulose esters, e.g., partly hydrolyzed cellulose acetate etc.
- hydrophilic colloids e.g., colloidal albumin, zein, agar-agar, polyvinyl alcohol, polyvinyl pyrrolidone, cellulose ethers, partly hydrolyzed cellulose esters, e.g., partly hydrolyzed cellulose acetate etc.
- the emulsions may be coated on any of a wide variety of supports in accordance with usual practice to provide light-sensitive silver halide materials.
- the supports include glass, paper, baryta-coated paper, polyolefin-coated paper, e.g., coated with polyethylene and polypropylene, which in order to promote adhesion of the emulsion may be electron-radiated, film supports of cellulose acetate, cellulose acetatebutyrate, polyesters, e.g., polyethylene terephthalate,
- the emulsion was reductionand gold-fogged by adjustment of the pAg to 5.3 and the pH to 7, by heating for 90 minutes at 60C and by the addition of 30 mg of chloroaurate per mole of silver halide. Heating was continued for minutes at 60C whereupon the pAg was adjusted to 8.2 at 35C.
- the emulsion was divided into several samples and to each sample one of the desensitizing agents listed in the table below was added in an amount of 600 mg per mole of silver halide.
- a magentaforming color coupler of the formula t-CsHn C N m5 lLNHCo was added also in an amount of 4() g. per mole of silver halide.
- the values of the speed obtained after exposure and conventional black-and-white or color processing are listed in the table below.
- the values given for the speed are relative log exposure values. An increase of these values by 0.30 means a doubling of the speed.
- Example 1 was repeated with the difference that the magenta-forming color coupler was replaced by the cyan forming color coupler corresponding to the formula
- the values of the speed obtained are listed in the following table.
- Example 1 was repeated with the difference that the magenta-forming color coupler was replaced by a yellow-forming color coupler corresponding to the formula 0 (CH1) GB:
- Example 1 was repeated with the difference that 5-mnitrobenzylidene rhodanine was used as comparative desensitizing agent instead of pinacryptol yellow.
- Example 4 was repeated with the difference that the magenta-forming color coupler was replaced by the color coupler of the formula The values of the speed obtained are listed in the foll.
- a direct-positive photographic color element which comprises uniformly fogged radiation-sensitive silver halide, a color forming coupling product capable of forming a dye on coupling with an oxidized aromatic primary amino color developing agent and a desensitizing agent or a desensitizing agent precursor wherein said desensitizing agent has one of the following general formulae, a tautomeric form thereof, or is a corresponding disulphide R is hydroxyl or C,C alkyl,
- R is hydrogen or C C alkyl
- R is C -C alkyl or aryl
- A is a single bond or NH
- B is phenyl or diphenyl sulphone group in which the or both phenyl group(s) is (are) substituted with one or more nitro groups
- n 1, 2, or 3.
- a direct-positive photographic element wherein the said desensitizing agent precursor is a compound corresponding to one of the general formulae of claim 1, or a tautomeric form thereof, wherein the tautomeric hydrogen atom is replaced by a COX group in which X represents alkyl, aralkyl, aryl, or a group identical to the diazine group linked to the carbonyl group of COX, by a SO Y group in which Y is alkyl, aryl, or aralkyl, or by a COOZ group wherein Z is alkyl or aryl.
- a direct-positive photographic element according to claim 1, wherein the silver halides of the emulsion have a substantially uniform diameter.
- a method of producing a direct-positive image which comprises exposing image-wise to radiation a direct-positive element according to claim 1, and developing the exposed material in a silver halide developer comprising an aromatic primary amino color developing agent.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
- Plural Heterocyclic Compounds (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3601771A GB1388847A (en) | 1971-07-30 | 1971-07-30 | Direct-positive silver halide emulsions |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3779776A true US3779776A (en) | 1973-12-18 |
Family
ID=10384047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00269861A Expired - Lifetime US3779776A (en) | 1971-07-30 | 1972-07-07 | Fogged, direct-positive silver halide emulsion containing a color coupler and a heterocyclic mercaptan desensitizer |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3779776A (en:Method) |
| BE (1) | BE785847A (en:Method) |
| CA (1) | CA1000100A (en:Method) |
| DE (1) | DE2237036A1 (en:Method) |
| FR (1) | FR2147985B1 (en:Method) |
| GB (1) | GB1388847A (en:Method) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3980481A (en) * | 1973-01-25 | 1976-09-14 | Afga-Gevaert N.V. | Direct-positive super-sensitized silver halide emulsions |
| US4273862A (en) * | 1977-06-11 | 1981-06-16 | Mitsubishi Paper Mills, Ltd. | Direct-positive silver halide photographic sensitive materials |
| US4444871A (en) * | 1981-10-08 | 1984-04-24 | Konishiroku Photo Industry Co., Ltd. | Method for forming a direct positive color image |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2901351A (en) * | 1954-12-10 | 1959-08-25 | Gavaert Photo Producten N V | Direct positive photographic material |
| US3501305A (en) * | 1966-03-11 | 1970-03-17 | Eastman Kodak Co | Monodispersed photographic reversal emulsions |
-
0
- BE BE785847D patent/BE785847A/nl unknown
-
1971
- 1971-07-30 GB GB3601771A patent/GB1388847A/en not_active Expired
-
1972
- 1972-07-07 US US00269861A patent/US3779776A/en not_active Expired - Lifetime
- 1972-07-10 FR FR7225022A patent/FR2147985B1/fr not_active Expired
- 1972-07-12 CA CA146,954A patent/CA1000100A/en not_active Expired
- 1972-07-28 DE DE2237036A patent/DE2237036A1/de active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2901351A (en) * | 1954-12-10 | 1959-08-25 | Gavaert Photo Producten N V | Direct positive photographic material |
| US3501305A (en) * | 1966-03-11 | 1970-03-17 | Eastman Kodak Co | Monodispersed photographic reversal emulsions |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3980481A (en) * | 1973-01-25 | 1976-09-14 | Afga-Gevaert N.V. | Direct-positive super-sensitized silver halide emulsions |
| US4273862A (en) * | 1977-06-11 | 1981-06-16 | Mitsubishi Paper Mills, Ltd. | Direct-positive silver halide photographic sensitive materials |
| US4444871A (en) * | 1981-10-08 | 1984-04-24 | Konishiroku Photo Industry Co., Ltd. | Method for forming a direct positive color image |
Also Published As
| Publication number | Publication date |
|---|---|
| CA1000100A (en) | 1976-11-23 |
| BE785847A (nl) | 1973-01-05 |
| DE2237036A1 (de) | 1973-02-08 |
| GB1388847A (en) | 1975-03-26 |
| FR2147985A1 (en:Method) | 1973-03-11 |
| FR2147985B1 (en:Method) | 1978-03-24 |
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