Photographic material containing magenta dye forming coupler
AssigneeEastman Kodak Company
InventorsJane Sarah Boff, Bernard Arthur Clark, Paul Louis Stanley, Christina Mary Watts, Stephen Paul Singer
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Abstract
The invention provides a light sensitive photographic silver halide emulsion layer having associated therewith a magenta coupler having formula I: ##STR1## wherein: R represents a ballasted monosubstituted amino group which enables the coupler to form, upon development with 4-amino-3-methyl-N-ethyl-N-(2-hydroxyethyl)aniline sulfate developing agent, a magenta dye having a wavelength of maximum absorbance of 545 nm or greater; and X represents hydrogen or a coupling-off group. The resulting dye has an improved spectral absorption curve.
Claims20
A light sensitive photographic silver halide emulsion layer having associated therewith a magenta coupler having formula (I):
- ##STR20## wherein:
- R represents a ballasted monosubstituted amino group, wherein the amino group is an anilino group, which enables the coupler to form, upon development with 4-amino-3-methyl-N-ethyl-N-(2-hydroxyethyl)aniline sulfate developing agent, a magenta dye having a wavelength of maximum absorbance of 545 nm or greater;
- and
- X represents hydrogen or a coupling-off group.
A light sensitive photographic silver halide emulsion layer having associated therewith a magenta coupler that has formula (II):
- ##STR21## wherein:
- X is hydrogen or a coupling-off group;
- each R.sub.1 independently represents a substituent such that the sum total of the Hammett .sigma.-para constants of the n substituents is 0.68 or greater, and
- n=1 to 5;
- provided that the selection of the R.sub.1 substituents is sufficient to ballast the coupler.
A light sensitive photographic silver halide emulsion layer having associated therewith a magenta coupler that has formula (III):
- ##STR22## wherein:
- X is as above;
- R.sub.2 is a ballasted sulfone (--SO.sub.2 R.sub.3), sulfamoyl (--SO.sub.2 NR.sub.3 R.sub.4) or carbamoyl (--CONR.sub.3 R.sub.4) group in which R.sub.3 is an alkyl or aryl group and R.sub.4 is hydrogen or an alkyl or aryl group.
Dependencies are inferred from the claim text.