Photographic color couplers, photographic materials containing them and method of forming dye images
AssigneeEastman Kodak Company
InventorsJoseph Bailey, David N. Rogers
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Abstract
Novel photographic dye-forming couplers comprise an imidazo[1,2-b]pyrazole nucleus which reacts at its 3-position with an oxidized aromatic primary amino color developing agent. These couplers are monomeric or polymeric and are useful in photographic materials and processes and have improved absorption and solubility characteristics.
Claims9
A photographic element comprising a support and a photographic silver halide emulsion having associated therewith a color coupler which comprises an imidazo[1,2-b]pyrazole nucleus and which reacts at its 3-position with an oxidized aromatic primary amino color developing agent and contains a non-coupling-off group in the 7-position.
A process of forming a dye image in an exposed photographic element comprising a support and a photographic silver halide emulsion, said process comprising developing the photographic element with a silver halide color developing agent in the presence of a color coupler which comprises an imidazo-[1,2-b]pyrazole nucleus and which reacts at its 3-position with an oxidized aromatic primary amino color developing agent and said coupler contains a non-coupling-off group in the 7-position.
A photographic element comprising a support and a photographic silver halide emulsion having associated therewith a color coupler selected from the group consisting of:
- ______________________________________ ##STR40## Coupler No. X R1 R2 R3 ______________________________________ 1 H ##STR41## t-Bu CO.sub.2 Et 2 H H t-Bu CN 3 H H t-Bu CONH.sub.2 4 H H t-Bu CO.sub.2 Et 5 OPh ##STR42## t-Bu CO.sub.2 Et ______________________________________
Dependencies are inferred from the claim text.