Photographic coupler compositions and methods for reducing conti

Details Photographic coupler compositions and methods for reducing conti Photographic coupler compositions and methods for reducing conti

1991-04-23

1994-03-29

Wright, Lee C.

Radiation imagery chemistry: process, composition, or product th

Color imaging process

Stabilizing

430377, 430386, 430387, 430428, 430430, 430546, 430551, 430554, 430555, G03C 134, G03C 7384, G03C 742

Patent

active

052983684

ABSTRACT:
Photographic coupler compositions comprise (a) a pyrazolone magenta dye-forming coupler compound, and (b) a sulfoxide compound in an amount sufficient to reduce continued coupling of the coupler compound during the bleach step of a color photographic process. The sulfoxide compound is of the formula ##STR1## wherein R.sub.1 and R.sub.2 are individually selected from the group consisting of straight and branched chain alkyl groups, alkenyl groups and alkylene groups; straight and branched chain alkyl groups, alkenyl groups and alkylene groups containing at least one substituent selected from the group consisting of alkoxy, aryloxy, aryl, alkoxycarbonyl, aryloxycarbonyl, acyloxy, carbonamido and carbamoyl groups and halogen atoms; a phenyl group; and a phenyl group containing at least one substituent selected from the group consisting of alkyl, alkoxy, aryloxy, aryl, alkoxycarbonyl, aryloxycarbonyl, acyloxy, carbonamido and carbamoyl groups and halogen atoms. Additionally, R.sub.1 and R.sub.2 combined contain at least 12 carbon atoms. Preferably, the coupler composition is substantially free of phenol compounds when R.sub.1 and R.sub.2 are other than unsubstituted alkyl, alkenyl or alkylene groups.

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