Heterocyclic magenta dye-forming couplers
AssigneeEastman Kodak Company
InventorsJoseph Bailey, John Cook
Life of this patent
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Abstract
Photographic magenta dye-forming couplers have the general formula: ##STR1## wherein: A represents the atoms necessary to complete, with the nitrogen atom to which it is attached, a magenta dye-forming coupler moiety whose coupling position is inactivated by the --CHR.sup.1 R.sup.2 group; CHR.sup.1 R.sup.2 is a blocking group which, upon reaction with oxidized color developing agent, is detached from the coupler moiety to yield a mobile reaction product; R.sup.1 is alkyl--O--CO--, alkyl--CO--, aryl--O--CO--, aryl--CO--, --COOH, --NO.sub.2 or --CN and R.sup.2 is a group specified for R.sup.1 or aryl--NHCO--. These couplers can be incorporated in photographic elements, emulsions and processing compositions.
Claims8
A photographic element comprising a support and a photosensitive silver halide emulsion having associated therewith a nondiffusible magenta dye-forming coupler of the formula:
- ##STR9## wherein A represents the atoms necessary to complete, with the nitrogen atom to which it is attached, a ballasted pyrazolotriazole, pyrazolobenzimidazole or indazolin-3-one magenta dye-forming coupler moiety whose coupling position is inactivated by the --CHR.sup.1 R.sup.2 group;
- CHR.sup.1 R.sup.2 is a blocking group which, upon reaction with oxidized color developing agent, is detached from the magenta dye-forming coupler moiety to yield a mobile reaction product;
- R.sup.1 is alkyl--O--CO--, alkyl--C0--, aryl--O--CO--, aryl--C0--, --COOH, --NO.sub.2 or --CN;
- and
- R.sup.2 is a group specified for R.sup.1 or aryl--NHCO--.
A process of forming a magenta dye image in a photographic element comprising a support and an imagewise exposed silver halide emulsion, comprising the step of developing the element with a developer composition containing a color developing agent in the presence of a magenta dye-forming coupler having the structure:
- ##STR12## wherein:
- A represents the atoms necessary to complete, with the nitrogen atom to which it is attached, a pyrazolotriazole, pyrazolobenzimidazole or indazolin-3-one magenta dye-forming coupler moiety whose coupling position is inactivated by the --CHR.sup.1 R.sup.2 group;
- CHR.sup.1 R.sup.2 is a blocking group which, upon reaction with oxidized color developing agent, is detached from the magenta dye-forming coupler moiety to yield a mobile reaction product;
- R.sup.1 is alkyl---O--CO--, alkyl--CO--, aryl--O--CO--, aryl--CO--, --COOH, --NO.sub.2 or --CN;
- and
- R.sup.2 is a group specified for R.sup.1 or aryl--NHCO--.
Dependencies are inferred from the claim text.