Silver halide photographic material

Details Silver halide photographic material Silver halide photographic material

1991-09-03

1993-07-20

Wright, Lee C.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Identified radiation sensitive composition with color...

430567, G03C 738

Patent

active

052292614

ABSTRACT:
A silver halide color photographic material, which comprises a support and a silver halide emulsion layer, contains a pyrazoloazole type coupler represented by the following general formula (II) in the emulsion layer, to ensure high sensitivity and high gamma without attended by increase in fog: ##STR1## wherein R.sub.1 represents a hydrogen atom or a substituent group; X represents a hydrogen atom or a group releasable upon coupling with the oxidation product of an aromatic primary amine developing agent; or --NH--; Zb and Zc also represent a methine group, a substituted methine group, .dbd.N-- or --NH--, wherein the substituent of at least either of Zb and Zc is a tertiary alkyl group represented by ##STR2## provided that when Zc is the above-described substituted methine group having the tertiary alkyl group as a substituent, R.sub.1 is not such a tertiary alkyl group, and when Zb represents the above-described substituted methine group, either Za or Zc is --NH-- and the remainder is a methine group, a substituted methine group or .dbd.NH--, while when Zc represents the above-described substituted methine group, Za is --NH-- and Zb is a methine group, a substituted methine group or .dbd.N--. R.sub.2 represents an alkyl group or a halogen atom; and R.sub.3 and R.sub.4 each represents substituents as defined in the specification.

REFERENCES:
patent: 4522916 (1985-06-01), Hirano
patent: 4623617 (1986-11-01), Kaneko et al.
patent: 4665015 (1987-05-01), Iijima et al.
patent: 4710453 (1987-12-01), Hirabayashi et al.
patent: 4882266 (1989-11-01), Kawagishi et al.

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