Dye forming couplers, and a method of color image formation and silver halide color photographic photosensitive materials in which they are used

Claim 2

A silver halide color photosensitive material comprising a support having thereon at least one layer containing a dye forming coupler represented by formula (I): ##STR8## wherein R 1 and R 2 , which may be the same or different, each represents a substituent group, and R 1 and R 2 substantially cannot be eliminated when the dye forming coupler is reacted with the oxidized species of a primary aromatic amine derivative, and X is a hydrogen atom or a group which can be eliminated by a coupling reaction with the oxidized species of a primary aromatic amine derivative.

Claim 3

A silver halide color photosensitive material according to claim 1, wherein R 1 and R 2 each represents a halogen atom, an aliphatic group, an aromatic group, a heterocyclic group, an alkoxy group, an aryloxy group, an alkenyloxy group, an amino group, an aliphatic or aromatic acyl group, an aliphatic or aromatic oxycarbonyl group, an aliphatic or aromatic acyloxy group, an aliphatic or aromatic oxysulfonyl gorup, an alipahtic or aromatic acylamino group, a carbamoyl group, an aliphatic or aromatic sulfonamido group, a sulfamoyl group, a sulfamido group, an imido group, a ureido group, an aliphatic or aromatic sulfonyl group, an azo group, an aliphatic or aromatic sulfonyloxy group, a phosphoryl group, an aliphatic or aromatic thio group, an alipahtic or aromatic sulfinyl group, a hydroxyl group, a cyano group, a carboxyl group, a nitro group, or a sulfo group.

Claim 4

A silver halide color photosensitive material according to claim 1, wherein at least one of R 1 and R 2 is an electron withdrawing group having a Hammet substitution constant σ p of at least 0.10.

Claim 5

A silver halide color photosensitive material according to claim 3, wherein R 1 and R 2 each is an electron withdrawing group having a Hammet substitution constant σ p of at least 0 10.

Claim 6

A silver halide color photosensitive material according to claim 3, wherein said electron withdrawing group having a Hammet substitution constant σ p of at least 0.10 is selected from a cyano group, a carbamoyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, an aliphatic or aromatic acyl group, an aliphatic or aromatic sulfonyl group, a sulfamoyl group, a nitro group, an alkyl group substituted with polyhalogen atoms, a sulfinyl group, a carboxyl group, an azo group, an alkylsulfonyloxy group, a phosphoryl group, a heterocyclic residual group and an aryl group which is substituted with a cyano group, an aliphatic or aromatic sulfonyl group, a nitro group or polyhalogen atoms.

Claim 7

A silver halide color photosensitive material according to claim 3, wherein R 2 is an electron withdrawing group having a Hammet substitution constant σ p of at least 0.35.

Claim 8

A silver halide color photosensitive material according to claim 6, wherein said electron withdrawing group having a Hammet substitution constant σ p of at least 0.35 is selected from a cyano group, a carboxyl group, an azo group, a nitro group, an aliphatic or aromatic acyl group, a carbamoyl group, an alkoxycarbonyl group, an alkylsulfonyloxy group, a phosphoryl group, a heterocyclic residual group, a sulfamoyl group, an aliphatic or aromatic sulfonyl group, an alkyl group substituted with polyhalogen atoms and an aryl group which is substituted with a cyano group, a sulfonyl group, a nitro group or polyhalogen atoms.

Claim 9

A silver halide color photosensitive material according to claim 6, wherein R 2 is an electron withdrawing group having a Hammet substitution constant σ p of at least 0.60.

Claim 10

A silver halide color photosensitive material according to claim 8, wherein said electron withdrawing group having a Hammet substitution constant σ p of at least 0.60 is selected from a cyano group, a nitro group and an aliphatic or aromatic sulfonyl group.

Claim 11

A silver halide color photosensitive material according to claim 1, wherein X is a hydrogen atom or a group selected from a halogen atom, an alkoxy group, an aryloxy group, an aliphatic or aromatic acyloxy group, an aliphatic or aromatic sulfonyloxy group, an acylamino group, an aliphatic or aromatic sulfonamido group, an alkoxycarbonyloxy group, an aryloxycarbonyloxy group, an aliphatic or aromatic thio group, a carbamoylamino group, a five-or six-membered nitrogen-containing heterocyclic group, an imido group, an aromatic azo group, and a carboxyl group.

Claim 12

A silver halide color photosensitive material according to claim 1, wherein said dye forming coupler is a magenta dye forming coupler or a cyan dye forming coupler.

Claim 13

A silver halide color photosensitive material according to claim 1, wherein the amount of said dye forming coupler ranges from 1×10 -3 mol to 1 mol per mol of silver halide.