Photographic color couplers and photographic materials containing them
AssigneeEastman Kodak Company
InventorHugh M. Williamson
Life of this patent
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Abstract
A photographic element comprising a support, at least one photosensitive silver halide layer and associated therewith a color coupler of the general formula (1) or (2): ##STR1## wherein A and B represent the same or different electron-withdrawing group, X is H or a group which splits off on coupling with oxidized color developer, R is an alkyl, cycloalkyl, aryl or heterocyclic which may be substituted, --COR.sup.1, --CSR.sup.1, SOR.sup.1, SO.sub.2 R.sup.1, --NHCOR.sup.1, --CONHR.sup.1, --COOR.sup.1, --COSR.sup.1, --NHSO.sub.2 R.sup.1 wherein R.sup.1 is an alkyl, cycloalkyl, or aryl group any of which are optionally substituted, and wherein two or more of A, B, R, and X optionally form part of a ring, Link is a linking group and n is 0, 1 or 2.
Claims17
A photographic element comprising a support, at least one photosensitive silver halide layer and associated therewith a color coupler of the general formula (1) or (2):
- ##STR271## wherein A and B represent the same or different electron-withdrawing groups,
- X is H or a group which splits off from the carbon atom to which it is attached on coupling with oxidized color developer,
- R is an alkyl, cycloalkyl, aryl or heterocyclic which may be substituted, --COR.sup.1, --CSR.sup.1, SOR.sup.1, SO.sub.2 R.sup.1, --NHCOR.sup.1, --CONHR.sup.1, --COOR.sup.1, --COSR.sup.1, --NHSO.sub.2 R.sup.1 wherein R.sup.1 is an alkyl, cycloalkyl, or aryl group any of which are optionally substituted,
- and wherein two or more of B, R, and X optionally form part of a ring and A does not form part of a ring with B, R, or X,
- Link is a linking group and
- n is 0, 1 or 2.
Dependencies are inferred from the claim text.