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US 4,900,657 AGranted
Novel pyrazolone photographic color couplers and photographic elements containing them
AssigneeEastman Kodak Company
InventorsMichael W. Crawley, Paul Louis R. Stanley
Life of this patent
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Abstract
Pyrazolone magenta dye-forming couplers are described which provide excellent formaldehyde stability and which result in dyes having good stability to light, heat and moisture and which have higher .beta.max values as compared with dyes obtained from prior described pyrazolone couplers.
Claims5
A photographic recording material comprising a support and a photosensitive silver halide emulsion layer which has associated therewith a magenta dye-forming coupler compound having the structural formula:
- ##STR6## wherein:
- R.sup.1 is H or Cl;
- R.sup.2 is NHSO.sub.2 R.sup.9, NHCOR.sup.9, --NHCONHR.sup.9, --CONHR.sup.9, --NR.sup.8 R.sup.9, --R.sup.9 or --OR.sup.9, or together with R.sup.3 forms a fused ring system;
- R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are each H, Cl or R.sup.2 ;
- R.sup.7 is H, --COOR.sup.8 or --CONHR.sup.8 ;
- R.sup.8 is alkyl or substituted alkyl;
- and
- R.sup.9 is H or as defined for R.sup.8.
5 more elements
Dependencies are inferred from the claim text.