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US 5,441,863 AGranted
Photographic elements with heterocyclic cyan dye-forming couplers
AssigneeEastman Kodak Company
InventorsPing W. Tang, Thomas H. Jozefiak, David J. Decker
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Abstract
Novel imidazo[3,2-a]imidazole cyan dye-forming couplers and photographic elements containing them are described. The couplers are represented by the following structure: ##STR1## wherein: EWG.sub.1 and EWG.sub.2 each independently represent an electron withdrawing group; X is hydrogen or a coupling-off group; and R.sup.1 is hydrogen or a substituent group.
Claims9
A light-sensitive photographic element comprising a support bearing a silver halide emulsion associated with a imidazo[3,2-a]imidazole cyan dye-forming coupler having the structure:
- ##STR7## wherein:
- EWG.sub.1 and EWG.sub.2 each independently represent an electron withdrawing group;
- X is hydrogen or a coupling-off group;
- and
- R.sup.1 is hydrogen or a substituent group;
- and
- the dye formed on coupling with an N-{2-[(4-amino-3-methylphenyl)ethylamino]ethyl}methanesulfonamide sesquisulfate developing agent has a spectral absorption peak in the region of the spectrum from 650 to 710 nm with a half band width of less than 195 nm.
4 more elements
Dependencies are inferred from the claim text.