Phenol substituted pyrazolo 1, 5-a benzimidazole couplers

Details Phenol substituted pyrazolo 1, 5-a benzimidazole couplers Phenol substituted pyrazolo 1, 5-a benzimidazole couplers

1997-02-11

1998-07-07

Letscher, Geraldine

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Identified radiation sensitive composition with color...

G03C 108, G03C 726, G03C 732

Patent

active

057766690

ABSTRACT:
formula (I) ##STR1## wherein R to R.sup.4 are selected from H, substituted or unsubstituted alkoxy, anilino, aryl, alkyl or amido groups, and X is H or a coupling-off group; characterized in that said compound of Formula I is linked via any of the moieties R to R.sup.4 or X to a compound of the formula (II): ##STR2## wherein W is an electron withdrawing group and L is a linking group. Compounds with the low pKa phenolic substituent provide improved coupling activity when used with a photographic element and improved contrast.

REFERENCES:
patent: 5143821 (1992-09-01), Crawley et al.
English Translation of J62/196662, Aug. 1987, Japan.

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