Photographic silver halide materials and process comprising new pyrazoloazole couplers
AssigneeEastman Kodak Company
InventorsRobert F. Romanet, Teh-Hsuan Chen
Life of this patent
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Abstract
Novel pyrazoloazole dye-forming couplers contain on the azole ring a group containing a carbon atom bonded directly to the azole ring and wherein this carbon atom is bonded directly to a nitrogen atom in the group. Such couplers provide advantageous bathochromic hue shift in dyes formed from the couplers. These couplers are useful in photographic silver halide materials and processes.
Claims17
A photographic element comprising a support, at least one photographic silver halide emulsion and a photographic pyrazoloazole coupler having substituted on the azole ring of the coupler a group represented by the structure:
- ##STR67## wherein:
- R.sub.1 and R.sub.2 are individually hydrogen, unsubstituted or substituted alkyl or unsubstituted or substituted aryl;
- R3 and R4 are individually hydrogen, unsubstituted or substituted alkyl, unsubstituted or substituted aryl, or ##STR68## wherein at least one of R.sub.3 and R.sub.4 is alkyl, aryl or ##STR69## R.sub.5 is unsubstituted or substituted alkyl, unsubstituted or substituted aryl, or NH--R.sub.6 ;
- and
- R.sub.6 is unsubstituted or substituted alkyl or unsubstituted or substituted aryl and wherein the photographic silver halide emulsion is a silver bromoiodide emulsion.
A photographic element comprising a support, at least one photographic silver halide emulsion and a photographic coupler represented by the structure:
- ##STR70## wherein:
- J is a substituent;
- Q is hydrogen or a coupling-off group;
- X, Y and Z are individually selected from carbon and nitrogen atoms necessary to complete an azole ring;
- R.sub.8 and R.sub.9 are individually hydrogen, unsubstituted or substituted alkyl or unsubstituted or substituted aryl;
- R.sub.10 and R.sub.11 are individually hydrogen, unsubstituted or substituted alkyl, unsubstituted or substituted aryl or ##STR71## wherein at least one of R.sub.10 and R.sub.11 is alkyl, aryl or ##STR72## R.sub.12 is unsubstituted or substituted alkyl, unsubstituted or substituted aryl or NH--R.sub.13 ;
- R.sub.13 is unsubstituted or substituted alkyl or unsubstituted or substituted aryl and further wherein said silver halide emulsion is a silver bromoiodide emulsion.
A process of forming a photographic image which comprises developing an exposed silver halide emulsion layer with a color developing agent in the presence of a photographic pyrazoloazole coupler wherein the pyrazoloazole coupler has substituted on the azole ring of the coupler a group represented by the formula:
- ##STR75## wherein:
- R.sub.1 and R.sub.2 are individually hydrogen, unsubstituted or substituted alkyl, or unsubstituted or substituted aryl;
- R.sub.3 and R.sub.4 are individually hydrogen, unsubstituted or substituted alkyl, unsubstituted or substituted aryl, or ##STR76## wherein at least one of R.sub.3 and R.sub.4 is alkyl or aryl or ##STR77## R.sub.5 is unsubstituted or substituted alkyl, or NH--R.sub.6 ;
- and R.sub.6 is unsubstituted or substituted alkyl, or unsubstituted or substituted aryl and further wherein said silver halide emulsion layer is a silver bromoiodide emulsion layer.
A photographic element comprising a support, at least one silver halide emulsion and a photographic pyrazolotriazole coupler having substituted on the azole ring of the coupler a group containing a carbon atom (A) bonded directly to the azole ring and wherein the carbon atom (A) is bonded directly to a nitrogen atom in the group and to an unsubstituted or substituted alkyl or aryl group and further wherein said emulsion is a photographic silver bromoiodide emulsion.
A photographic element comprising a support, at least one silver halide emulsion and a pyrazolo[3,2-c]-s-triazole coupler having in the 3-position a ballast group containing a carbon atom (A) bonded directly to the pyrazolo[3,2-c]-s-triazole nucleus and wherein the carbon atom (A) is bonded directly to a nitrogen atom in the ballast group and to an unsubstituted or substituted alkyl or aryl group and further wherein said emulsion is a photographic silver bromoiodide emulsion.
Dependencies are inferred from the claim text.