2-equivalent acylacetamide yellow forming couplers with 2,6-dioxo-7-purinyl coupling off group

Claim 2

A photographic material comprising at least one silver halide emulsion layer and a 2-equivalent yellow forming ketomethylene colour coupler wherein the active methylene group carries a 2,6-dioxo-7-purinyl group in its oxo- or enol form and has the formula: ##STR7## wherein: Cp represents a yellow forming open-chain acylacetamide coupler residue linked through the active methylene group, each of R 1 and R 2 , which may be the same or different, represents hydrogen, an alkyl group, or an aryl group, and R 3 represents hydrogen, an alkyl group, an aryl group, a hydroxy group, an alkoxy group, an amino group, a mercapto group, an alkylthio group, a carboxy group, an alkoxycarbonyl group or a carbamoyl group.

Claim 3

A photographic material according to claim 1, wherein R 1 and R 2 are alkyl.

Claim 4

A photographic material according to claim 2, wherein R 1 and R 2 are methyl.

Claim 5

A photographic material according to claim 1, wherein the yellow forming colour coupler residue carrying the heterocyclic substituent at the coupling position corresponds to the formula: ##STR8## wherein: each of Q 1 and Q 3 , which may be the same or different, represents an aliphatic, aromatic or heterocyclic group, and Q 2 represents hydrogen or C 1 -C 5 alkyl.

Claim 6

A photographic material according to claim 4, wherein Q 1 represents an alkyl group, an alkoxyalkyl group, a dicycloalkyl group, a heterocycle or an aryl group, Q 2 represents hydrogen or C 1 -C 5 alkyl, and Q 3 represents C 1 -C 18 alkyl, a heterocycle or an aryl group.

Claim 7

A photographic material according to claim 5, wherein the yellow forming colour coupler is a pivaloyl acetanilide colour coupler or a benzoylacetanilide colour coupler.

Claim 8

A photographic material according to claim 6, wherein R 1 and R 2 are alkyl.

Claim 9

A photographic material according to claim 7, wherein R 1 and R 2 are methyl.

Claim 10

A photographic material according to claim 8, wherein the yellow forming colour coupler residue corresponds to one of the formula: ##STR9## wherein: Z represents a halogen atom or an alkyl, alkoxy, aryloxy or amino group, each of Z 1 , Z 2 and Z 3 , which may be the same or different represents a hydrogen or halogen atom, an alkyl, alkoxy, aryl, aryloxy, alkoxycarbonyl, aryloxycarbonyl, alkylamino, arylamino, alkylsulphonyl, carbamoyl, sulphamoyl, acylamino, ureido, or hydroxy group or a sulpho or carboxy group in acid or salt form, and each of W, W 1 , W 2 and W 3 , which may be the same or different represents a hydrogen or halogen atom or an alkyl, alkoxy, aryloxy or amino group.

Claim 11

A photographic material according to claim 1, wherein the material also comprises a competing coupler in a light-sensitive or in a non-light-sensitive hydrophilic colloid layer.

Claim 12

A photographic material according to claim 1, wherein the yellow forming colour coupler is present in a silver halide emulsion layer.

Claim 13

A photographic material according to claim 1, wherein the yellow forming colour coupler is present in a non-light-sensitive hydrophilic colloid layer.

Claim 14

Method of producing coloured photographic images in a photographic light-sensitive silver halide material which comprises exposing the material and developing it with an aromatic primary amino colour developing agent in the presence of a 2-equivalent yellow forming ketomethylene colour coupler wherein the colour coupler carries at the active methylene group a 2,6-dioxo-7-purinyl group in its oxo- or enol form and has the formula: ##STR10## wherein: Cp represents a yellow forming open-chain acylacetamide coupler residue linked through the active methylene group, each of R 1 and R 2 , which may be the same or different, represents hydrogen, an alkyl group, or an aryl group, and R 3 represents hydrogen, an alkyl group, an aryl group, a hydroxy group, an alkoxy group, an amino group, a mercapto group, an alkylthio group, a carboxy group, an alkoxycarbonyl group or a carbamoyl group.

Claim 15

Method of producing coloured photographic images in a photographic light-sensitive silver halide material which comprises exposing the material and developing it with an aromatic primary amino colour developing agent in the presence of a 2-equivalent yellow forming ketomethylene colour coupler wherein the colour coupler carries at the active methylene group a 2,6-dioxo-7-purinyl group in its oxo- or enol form and has the formula: ##STR10## wherein: Cp represents a yellow forming open-chain acylacetamide coupler residue linked through the active methylene group, each of R 1 and R 2 , which may be the same or different, represents hydrogen, an alkyl group, or an aryl group, and R 3 represents hydrogen, an alkyl group, an aryl group, a hydroxy group, an alkoxy group, an amino group, a mercapto group, an alkylthio group, a carboxy group, an alkoxycarbonyl group or a carbamoyl group.

Claim 16

Method according to claim 13, wherein R 1 and R 2 are alkyl.

Claim 17

Method according to claim 14, wherein R 1 and R 2 are methyl.