1,2,4-triazole-releasing pyrazolone DIR couplers

Details 1,2,4-triazole-releasing pyrazolone DIR couplers 1,2,4-triazole-releasing pyrazolone DIR couplers

1996-12-30

1998-10-13

Letscher, Geraldine

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Identified radiation sensitive composition with color...

430505, 430555, G03C 108, G03C 726, G03C 732

Patent

active

058210431

ABSTRACT:
This invention provides a photographic element comprising a support bearing one or more silver halide emulsions and one or more pyrazolone magenta dye-forming DIR couplers of structure I: ##STR1## wherein: the R.sub.1 substituents are individually selected from halogen atoms and alkyl, phenyl, alkoxy, phenoxy, alkylthio, carbonamido, sulfonamido, carbamoyl, alkoxycarbonyl, and aryloxycarbonyl groups;

REFERENCES:
patent: 3933500 (1976-01-01), Shiba et al.
patent: 4745048 (1988-05-01), Kishimoto et al.
patent: 4748100 (1988-05-01), Umemmoto et al.
patent: 4820623 (1989-04-01), Koshimizu et al.
patent: 5021331 (1991-06-01), Vetter et al.
patent: 5200309 (1993-04-01), Merkel et al.
patent: 5563026 (1996-10-01), Singer
patent: 5709987 (1998-01-01), Begley et al.

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