Substituted At Coupling Position With Other Than Hydrogen Patents (Class 430/557)
-
Patent number: 4409323Abstract: A silver halide photographic material containing a coupler capable of releasing a photographically useful group in a controllable timing.Type: GrantFiled: February 13, 1981Date of Patent: October 11, 1983Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Ryosuke Sato, Yuji Hotta, Katsumi Matsuura
-
Patent number: 4404274Abstract: A photographic light-sensitive element comprising a support and having thereon at least one silver halide emulsion layer containing an .alpha.-diacylamino substituted (aliphatic acyl) acetamide yellow dye forming coupler and a method for forming yellow dye images which comprises processing a silver halide photographic emulsion with an aromatic primary amino developing agent in the presence of an .alpha.-diacylamino substituted (aliphatic acyl) acetamide compound are disclosed. The coupler is an excellent two-equivalent coupler.Type: GrantFiled: April 6, 1981Date of Patent: September 13, 1983Assignee: Fuji Photo Film Co., Ltd.Inventors: Atsuaki Arai, Yasushi Oishi, Akio Okumura, Kiyoshi Nakazyo
-
Patent number: 4401752Abstract: Couplers of good reactivity contain an aryloxy coupling-off group having in an ortho position a polarizable carbonyl, sulfonyl or phosphinyl substituent group which is free of photographic dye groups and photographic reagent groups.Type: GrantFiled: November 23, 1981Date of Patent: August 30, 1983Assignee: Eastman Kodak CompanyInventor: Philip T. S. Lau
-
Patent number: 4390618Abstract: A silver halide photographic light-sensitive material is described comprising a layer containing a coupler compound represented by formula (I)A--B (I)wherein A represents a residue of a compound capable of undergoing a coupling reaction with an oxidation product of an aromatic primary amine developing agent, by the removal of one hydrogen atom from the active position of said compound, and B represents a group which is released by the coupling reaction and exhibits a development accelerating function.Type: GrantFiled: March 15, 1982Date of Patent: June 28, 1983Assignee: Fuji Photo Film Co., Ltd.Inventors: Hidetoshi Kobayashi, Toshirou Takahashi, Shigeo Hirano, Takeshi Hirosa, Keiichi Adachi
-
Patent number: 4387159Abstract: A light-sensitive, color photographic silver halide multilayer material contains for the improvement of definition, grain and color rendition DIR-couplers which are substituted in coupling position by mercapto-azole-, mercaptobenz-azole- or mercapto-azine moieties, which themselves carry hydrophilic substituents. The DIR-couplers according to the invention may be used together with other couplers and additives or as sole color forming element and are noteworthy for their high color yields, inter- and intra-image effects. They may be added as well in hydrophobic state (in dispersed form) as in hydrophilic state (as alkaline solutions) and they may be used in single layers or as associated layers with a maximum three layers of a color forming unit and the layers may be arranged in any desired order within the whole combination of layers.Type: GrantFiled: May 8, 1981Date of Patent: June 7, 1983Assignee: VEB Filmfabrik WolfenInventors: Horst Engelmann, Rainer Redmann, Monika Bethke, Christa Melz, Gerd West, Jurgen Mistol, Udo Sydow
-
Patent number: 4370410Abstract: A silver halide color material comprising red, green and blue photosensitive silver halide emulsion layers, each of which contains a coupler, and in which said green photosensitive layer is composed of at least two layers and between those of which said red photosensitive layer is arranged, and said green photosensitive layer contains an anti-diffusive yellow coupler.Type: GrantFiled: December 23, 1981Date of Patent: January 25, 1983Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Toshifumi Iijima, Wataru Fujimatsu, Kaoru Onodera
-
Patent number: 4359521Abstract: Light-sensitive color photographic material which contains on a base in at least one silver halide emulsion layer or an interlayer which is assigned to this and does not contain silver halide, at least one DIR coupler of the formula ##STR1## in which R is alkyl having 1 to 18 carbons atoms or aryl, D is hydrogen, optionally substituted alkyl having 1 to 18 carbon atoms, cycloalkyl having 3 to 10 carbon atoms, alkenyl having 2 to 18 carbon atoms, cycloalkenyl having 5 to 10 carbon atoms, aralkyl having 7 to 18 carbon atoms, cyano or halogen and G is a optionally substituted aliphatic hydrocarbon radical having 1 to 18 carbon atoms, the sum of the carbon atoms in the substituents D and G being at least 5, L.sub.1 is hydrogen or alkyl having 1 to 5 carbon atoms, L.sub.Type: GrantFiled: December 19, 1979Date of Patent: November 16, 1982Assignee: Ciba-Geigy AGInventors: Mario Fryberg, Remon Hagen, John G. V. Scott
-
Patent number: 4356258Abstract: A photographic acylacetanilide yellow coupler having at the acyl or anilide portion thereof a moiety represented by --X--Y--Z where X represents --NHCO-- or --CONH-- radical, Y represents a divalent organic radical, Z represents ##STR1## wherein R.sub.1 is an alkyl or aryl radical, and a color photographic material containing an acylacetanilide yellow coupler.Type: GrantFiled: November 21, 1980Date of Patent: October 26, 1982Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Tugumoto Usui, Katsunori Kato, Tamotsu Kojima
-
Patent number: 4355100Abstract: A color photographic material having a light-sensitive silver halide emulsion layer containing a DIR compound having an amino group and a DIR compound having no amino group.Type: GrantFiled: January 19, 1981Date of Patent: October 19, 1982Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Hiroshi Sugita, Shizuo Saito, Ryosuke Sato, Kiyoshi Yamashita
-
Patent number: 4352873Abstract: A silver halide color photographic material comprising: a support; and a plurality of photographic layers including silver halide emulsion layer formed thereon, wherein one of said photographic layers is comprised of a compound containing recurring unit represented by formula (I) ##STR1## wherein R represents a hydrogen, an alkyl group having 1 to 6 carbon atoms, or a halogen group; M represents hydrogen, an alkali metal, an alkaline earth metal, or an organic base; X represents an alkyl group having 1 to 6 carbon atoms, an alkoxy group, an alkylamino group or a halogen group; m represents 0, 1, or 2 and n represents 1 or 2.Type: GrantFiled: April 27, 1981Date of Patent: October 5, 1982Assignee: Fuji Photo Film Co., Ltd.Inventors: Yuzo Toda, Junji Koizumi, Masasi Ogawa, Hidefumi Sera, Seiiti Kubodera
-
Patent number: 4336327Abstract: A silver halide color photographic light-sensitive material containing a yellow color coupler represented by the following general formula (I): ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3, which may be the same or different, each represents a hydrogen atom, a methyl group or a halogen atom; R.sub.4 represents an aryl group which may be substituted; and X.sub.1 represents a hydrogen atom or a group capable of coupling off.The color photographic light-sensitive material provides a yellow color image having exceptional fastness to light.Type: GrantFiled: December 17, 1980Date of Patent: June 22, 1982Assignee: Fuji Photo Film Co., Ltd.Inventors: Mitsugu Tanaka, Momotoshi Tsuda
-
Patent number: 4327175Abstract: A silver halide photographic light-sensitive material having on a support at least one layer containing a color coupler selected from the compounds represented by the general formulae (III) and (IV). The coupler is dispersed using a high boiling point organic solvent selected from the compounds represented by the general formulae (I) and (II). By the combined use of such a color coupler and high boiling point organic solvent, it is possible to prevent color deepening which occurs with the lapse of time, and prevent the formation of dye stain in an area not to be developed during the development process. ##STR1## wherein R.sub.1 is an alkyl group, an alkoxy group, an acyloxy group, an aryloxy group or a halogen atom; R.sub.2 is a cyclic saturated hydrocarbon residue; m is 0 or an integer of 1 to 5; and n is an integer of 1 to 6; and wherein when m or n is an integer of 2 or more, each R.sub.1 and R.sub.2 may be the same or different. ##STR2## wherein R.sub.3 is a cyclic saturated hydrocarbon residue; and R.Type: GrantFiled: April 27, 1981Date of Patent: April 27, 1982Assignee: Fuji Photo Film Co., Ltd.Inventors: Yuzo Toda, Hidetoshi Kobayashi, Junji Koizumi
-
Patent number: 4326024Abstract: A silver halide color photosensitive material containing a yellow-dye-forming coupler having the formula (I): ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 each independently represents a hydrogen, a halogen, an alkyl group, an alkoxy group, an aryloxy group, an alkoxycarbonyl group, an aryl group, a heterocyclic group or a carboxyl group; R.sub.4 represents an aryl group or a tertiary alkyl group; R.sub.5 and R.sub.6 each independently represents a hydrogen, a halogen or an alkoxy group; and R.sub.7 represents a substituted or unsubstituted alkyl group.Type: GrantFiled: March 20, 1981Date of Patent: April 20, 1982Assignee: Fuji Photo Film Co., Ltd.Inventors: Hidetoshi Kobayashi, Mitsugu Tanaka
-
Patent number: 4324898Abstract: Color photographic material is provided which comprises at least one silver halide emulsion layer containing a yellow color coupler of the formula ##STR1## in which G represents a yellow coupler radical bonded via the active methine group to the heterocyclic ring, Z represents --CO-- or --SO.sub.2 -- and M represents a substituent and A represents the non-metallic atoms necessary to complete a five-membered saturated heterocyclic ring.The new two-equivalent yellow couplers lead due to their improved reactivity (high maximum density), minimal fog and high fastness to light and outstanding spectral properties of the dyestuffs formed therefrom to a color photographic material of advantageous properties.Type: GrantFiled: August 30, 1979Date of Patent: April 13, 1982Assignee: Ciba Geigy AGInventor: Paul Tschopp
-
Patent number: 4315069Abstract: Color photographic material is described in which a yellowish image is formed which can be used to print black and white prints. Also present in the layer is a small amount of a more reactive coupler which produces a colored image to which black and white paper is not sensitive. This more reactive coupler reduces the fog in the highlight areas.Most preferably small amounts of other couplers are present which result in a green or brown image which makes it easier for the operator to focus the image.Type: GrantFiled: September 11, 1980Date of Patent: February 9, 1982Assignee: Ciba Geigy AGInventors: John G. V. Scott, Anthony K. Harvey
-
Patent number: 4314023Abstract: A photographic yellow coupler having a general formula selected from the group consisting of (I), (II) and (III) ##STR1## wherein A is a yellow coupler residue defined by removing one hydrogen atom of a active methylene group from a yellow coupler having the active methylene group; Q is a group having a formula selected from the group consisting of ##STR2## and ##STR3## (where X and Y are individually a hydrogen atom or an alkyl, acyl, aryl or aralkyl group; Z is a hydrogen atom or an alkyl, aryl or aralkyl group; and R.sub.1 and R.sub.2 are individually a hydrogen atom or an alkyl, aryl or aralkyl group or both of R.sub.1 and R.sub.2 together may form a benzylidene group or a cycloalkyl group); and Q' is a group of the formula --CH.sub.2 --CH.sub.2 -- or ##STR4## (wherein R.sub.3 is a hydrogen or halogen atom or an alkoxy group; R.sub.4 is a hydrogen or halogen atom, an amino, acylamino, ureido, lower alkyl, alkoxy or hydroxy group; and R.sub.4 and R.sub.5 are individually a lower alkyl group).Type: GrantFiled: November 24, 1980Date of Patent: February 2, 1982Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Tamotsu Kojima, Hiroyuki Imamura, Mitsuto Fujiwhara, Wataru Fujimatsu, Takaya Endo
-
Patent number: 4310618Abstract: Novel dye-forming couplers have the structure: ##STR1## wherein: Z represents the atoms to complete, with the attached oxygen atom, the same or different 5-pyrazolone dye-forming coupler moiety, phenol dye-forming coupler moiety or naphthol dye-forming coupler moiety, the * in the ring completed by Z representing the coupling position;R is hydrogen or a coupling-off group;Bl is a blocking group removable, during development, from the coupler moiety completed by Z to which it is directly attached; andn is an integer of 2 to 4.Type: GrantFiled: May 30, 1980Date of Patent: January 12, 1982Assignee: Eastman Kodak CompanyInventors: Jose M. Fernandez, Joseph P. Pepe
-
Patent number: 4304845Abstract: The present invention relates to a process for forming a yellow color image which requires contacting exposed silver halide grain with a developer in the presence of a particular yellow coupler.Type: GrantFiled: June 20, 1980Date of Patent: December 8, 1981Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Wataru Fujimatsu, Shui Sato, Tamotsu Kojima, Shigemasa Itoh, Takaya Endo
-
Patent number: 4289847Abstract: The present invention relates to a method of forming a dye image which involves processing a light-sensitive silver halide photographic image, after its imagewise exposure, in the presence of a novel yellow coupler as depicted in the formula below and an aromatic primary amine color developing agent ##STR1## wherein R.sub.1 represents cyano, alkyl carbonyl, phenylalkyl carbonyl, phenoxy alkyl carbonyl, phenylthio alkyl carbonyl, arylcarbonyl, alkyl phenyl carbonyl, alkoxy phenyl carbonyl, R.sub.2, R.sub.3, R.sub.4, R.sub.5 independently are hydrogen, halogen, alkyl, alkoxy, aryloxy, alkylacyloxy, arylacyloxy, acylamino, N-alkyl carbamoyl, N-phenylcarbamoyl, alkylsulfonamido, arylsulfonamido, N-alkyl sulfamoyl, N-phenylsulfamoyl, or imido, R.sub.6 represents cycloalkyl, alkenyl, naphthyl, thienyl, benzothienyl, furyl, or pyranyl, or a group of the formula (II): ##STR2## wherein R.sub.7, R.sub.9 and R.sub.11 are each hydrogen or alkyl, the sum of the carbon atoms in R.sub.7, R.sub.9 and R.sub.Type: GrantFiled: July 21, 1980Date of Patent: September 15, 1981Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Wataru Ishikawa, Mitsuto Fujiwhara, Tamotsu Kojima, Takaya Endo, Katsunori Kato
-
Patent number: 4286053Abstract: Process for forming yellow dye images in silver halide photographic material using 2-equivalent .alpha.-pivaloyl acetanilide couplers having at the 5-position a ballasting sulfonyl amido group.Type: GrantFiled: November 21, 1979Date of Patent: August 25, 1981Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Wataru Ishikawa, Ryosuke Satoh, Kiyoshi Yamashita, Tugumoto Usui, Katsunori Kato
-
Patent number: 4286054Abstract: A light-sensitive, color photographic silver halide multilayer material contains for the improvement of definition, grain and color rendition DIR-couplers which are substituted in coupling position by mercapto-azole-, mercaptobenz-azole- or mercapto-azine moieties, which themselves carry hydrophilic substituents. The DIR-couplers according to the invention may be used together with other couplers and additives or as sole color forming element and are noteworthy for their high color yields, inter- and intra-image effects. They may be added as well in hydrophobic state (in dispersed form) as in hydrophilic state (as alkaline solutions) and they may be used in single layers or as associated layers with a maximum three layers of a color forming unit and the layers may be arranged in any desired order within the whole combination of layers.Type: GrantFiled: May 29, 1980Date of Patent: August 25, 1981Assignee: VEB Filmfabrik WolfenInventors: Horst Englemann, Rainer Redmann, Monika Bethke, Christa Melz, Gerd West, Jurgen Mistol, Udo Sydow
-
Patent number: 4283486Abstract: A silver halide color photographic light-sensitive material comprising a paper support, at least one color image-forming emulsion layer, and an oxygen-impermeable layer having an oxygen permeability of not more than 2.0 ml/m.sup.2 .multidot.hr.multidot.atm, said color image-forming layer and oxygen-impermeable layer being provided on the same side of the paper support.Type: GrantFiled: April 30, 1980Date of Patent: August 11, 1981Assignee: Fuji Photo Film Co., Ltd.Inventors: Toshiaki Aono, Takeshi Hirose
-
Patent number: 4273861Abstract: A multilayer color photographic material with improved color reproduction comprising a support having thereon at least two photosensitive silver halide emulsion layers which provide color images having different colors from each other, the multilayer color photographic material containing at least one interlayer color correction coupler as defined hereinafter.Type: GrantFiled: February 23, 1976Date of Patent: June 16, 1981Assignee: Fuji Photo Film Co., Ltd.Inventors: Keisuke Shiba, Takeshi Hirose, Jun Hayashi, Atsuaki Arai, Nobuo Furutachi, Harumi Katsuyama
-
Patent number: 4269936Abstract: The process of forming a dye image by developing an image-exposed silver halide photographic emulsion layer by an aromatic primary amine color developing agent in the presence of the yellow dye forming coupler shown by the general formula ##STR1## wherein R.sup.1 represents an aromatic group, R.sup.2 represents an aromatic group or a heterocyclic group, and Z represents the non-metallic atom or atoms necessary for forming a 4-membered ring, a 5-membered ring or a 6-membered ring together with ##STR2## in the above formula. A photographic element containing such a yellow-forming coupler.Type: GrantFiled: December 29, 1972Date of Patent: May 26, 1981Assignee: Fuji Photo Film Co., Ltd.Inventors: Atsuaki Arai, Yasushi Oishi, Kiyoshi Nakazyo, Atsushi Sugizaki, Akio Okumura
-
Patent number: 4268591Abstract: Light-sensitive recording material for color photography, which contains, in at least one silver halide emulsion layer, at least one yellow coupler of the formula ##STR1## in which R.sub.1 is alkyl, R.sub.2 is alkyl or aryl and R.sub.3 is substituted or unsubstituted alkyl, alkoxy or alkylmercapto, cycloalkylmercapto, aryl, aryloxy or arylmercapto, the sum of the carbon atoms in the substituents R.sub.1, R.sub.2 and R.sub.3 being 3 to 30 and at least two of these substituents being able to form a cyclic radical together with the carbon atom to which they are bonded, the R.sub.4 s are each halogen, alkyl, alkoxy, halogenoalkyl, alkylsulfonyl or aryloxy, X is a radical detachable during the coupling reaction, A is a 5-membered, heterocyclic, unsaturated ring system which contains 2 or 3 hetero-atoms, at least one of which is a nitrogen atom, and can be fused with a benezene ring and which is substituted by at least one ballast group and r is 1 or 2.Type: GrantFiled: August 28, 1979Date of Patent: May 19, 1981Assignee: Ciba-Geigy AGInventor: Paul Tschopp
-
Patent number: 4266019Abstract: A silver halide color photographic material containing a yellow coupler represented by following general formula (I): ##STR1## wherein A represents a yellow coupler from which one hydrogen atom bound to a carbon atom other than at a coupling active site is removed, and R.sub.1 and R.sub.2 each represents a straight chain or branched alkyl group containing 2 to 16 carbon atoms, with the sum of the carbon atoms contained in R.sub.1 and R.sub.2 being 10 to 20 is disclosed.Type: GrantFiled: September 13, 1979Date of Patent: May 5, 1981Assignee: Fuji Photo Film Co., Ltd.Inventors: Hidetoshi Kobayashi, Mitsugu Tanaka, Kozo Inouye, Hideki Naito
-
Patent number: 4264721Abstract: A color photographic material comprising, on a support, a silver halide emulsion layer which contains a 2-equivalent .alpha.-acylacetamide yellow coupler carrying a nitrogen-containing heterocyclic coupling off group, joined to a nitrogen atom, as being releasable upon the reaction with an oxidation product of a color developing agent and a compound of the following formula (I) or its tautomer: ##STR1## wherein X and Y are as herein defined, is described.Type: GrantFiled: October 29, 1979Date of Patent: April 28, 1981Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Shinji Shimano, Tsuneo Wada, Katsuo Mogaki, Shinichi Nakamura, Kouji Tokitou
-
Patent number: 4248962Abstract: Photographic couplers which release a photographically useful group by an intramolecular nucleophilic displacement reaction can be used in photographic emulsions, elements and processes to provide a photographically useful group in a controlled manner.Type: GrantFiled: December 22, 1978Date of Patent: February 3, 1981Assignee: Eastman Kodak CompanyInventor: Philip T. S. Lau
-
Patent number: 4248961Abstract: Light-sensitive recording material for color photography is provided which contains, in at least one silver halide emulsion layer, a yellow coupler of the formula ##STR1## in which R and R' are alkyl, cycloalkyl or aryl and X.sub.1 and X.sub.2 are radicals which are detachable during the coupling reaction, Y is halogen, alkyl, alkoxy, alkylmercapto, --CN, --COOH, carbalkoxy, --NH.sub.2, --NHR.sub.1, --NR.sub.1 R.sub.2 or --NHCOR.sub.1, in which R.sub.1 and R.sub.2 are alkyl or phenyl, Z is alkyl having 5 to 40 carbon atoms, alkoxy having 5 to 40 carbon atoms, cycloalkoxy having 5 to 12 carbon atoms or aralkyl; alkoxyalkyl, alkoxycycloalkyl, cycloalkoxyalkyl, optionally substituted phenoxyalkyl, alkylamino- and dialkylamino-alkyl, optionally substituted arylamino- and diarylamino-alkyl, alkylmercaptoalkyl or optionally substituted arylmercaptoalkyl, in which radicals the sum of the carbon atoms in each case is 6 to 40; or --COOR.sub.3, --COR.sub.3, --NR.sub.3 R.sub.4, --CONR.sub.3 R.sub.4, --NR.sub.4 COR.sub.Type: GrantFiled: May 2, 1979Date of Patent: February 3, 1981Assignee: Ciba-Geigy AGInventors: Remon Hagen, Mario Fryberg
-
Patent number: 4241172Abstract: A silver halide color photographic material comprising a coupler represented by the following general formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 individually represent a substituted or unsubstituted alkyl, alkenyl, aryl, cycloalkyl group, or,-A-X).sub.n ].sub.m Cp in which Cp represents a cyan coupler, magenta coupler or yellow coupler, A represents a substituted or unsubstituted divalent aliphatic group, X represents a divalent group, and m and n individually represent a value of 0 or 1, provided that at least one of R.sub.1, R.sub.2, R.sub.3 and R.sub.4 is -A-X).sub.n ].sub.m Cp.Type: GrantFiled: May 24, 1979Date of Patent: December 23, 1980Assignee: Konishiroku Photo Industry Co., Ltd.Inventors: Kenichiro Okaniwa, Takashi Uchida, Morio Kobayashi, Hiroshi Sugita, Takashi Sasaki
-
Patent number: 4238564Abstract: Recording material for color photography, which contains, in at least one silver halide emulsion layer, at least one yellow coupler of the formula ##STR1## in which R.sub.1, R.sub.2, and R.sub.3 and R.sub.4 are alkyl, cycloalkyl or aryl, X.sub.1, X.sub.2, X.sub.3 and X.sub.4 are radicals detachable during the coupling reaction and Y.sub.1 and Y.sub.2 are halogen, alkyl, alkoxy, alkylmercapto, --CN, --COOH, carbalkoxy, --NH.sub.2, --NHR.sub.5, --NR.sub.5 R.sub.6 or --NHCOR.sub.5, in which R.sub.5 and R.sub.6 are alkyl or phenyl, Z is a divalent bridge member and r is 1 or 2.Photographic colored images with excellent spectral absorption characteristics and good resistance to light, heat and moisture are obtained by exposing the recording material image-wise and developing.Type: GrantFiled: June 11, 1979Date of Patent: December 9, 1980Assignee: Ciba-Geigy AktiengesellschaftInventor: Mario Fryberg
-
Patent number: 4206278Abstract: Color photographic material is provided which comprises at least one silver halide emulsion layer containing a yellow color coupler of the formula ##STR1## in which G represents a yellow coupler radical bonded via the active methine group to the heterocyclic ring, Z represents --CO-- or --SO.sub.2 -- and M represents a substituent and A represents the non-metallic atoms necessary to complete a five-membered saturated heterocyclic ring.The new two-equivalent yellow couplers lead due to their improved reactivity (high maximum density), minimal fog and high fastness to light and outstanding spectral properties of the dyestuffs formed therefrom to a color photographic material of advantageous properties.Type: GrantFiled: April 12, 1978Date of Patent: June 3, 1980Assignee: Ciba-Geigy AGInventor: Paul Tschopp
-
Patent number: 4186019Abstract: Useful 2-equivalent yellow couplers correspond to the formula ##STR1## in which A represents a yellow coupler radical connected through the coupling positionPy represents a pyridine group connected to the N through one of its carbon atomsR represents alkyl, aryl or dialkylaminoThe couplers provide high color density and low color fog.Type: GrantFiled: May 18, 1978Date of Patent: January 29, 1980Assignee: Agfa-Gevaert AktiengesellschaftInventors: Friedrich-Wilhelm Kunitz, Heinz Salzmann
-
Patent number: T101004Abstract: Novel 5-pyrazolone magenta dye-forming couplers are blocked with a coupler moiety which yields an alkali-soluble or colorless reaction product. The coupler moiety is joined via its coupling position to the enol oxygen of the 5-pyrazolone and is displaced therefrom during processing as a result of reaction by means of oxidized color developing agent to thereby activate the 5-pyrazolone coupler. These couplers have good reactivity and good resistance to aerial contaminants, such as formaldehyde, and can be incorporated in photographic emulsions and elements.Type: GrantFiled: December 29, 1980Date of Patent: September 1, 1981Inventors: Thomas E. Gompf, Howell A. Hammond, Jared B. Mooberry