Silver halide photographic material

Details Silver halide photographic material Silver halide photographic material

1993-05-04

1994-08-09

Chea, Thorl

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430578, 430581, 430582, 430583, 430584, 430585, 430586, 430587, 430588, G03C 112

Patent

active

053365941

ABSTRACT:
Disclosed is a silver halide photographic material containing at least one methine compound of formula (I) or (II): ##STR1## wherein A.sub.1 : ##STR2## and wherein Z.sub.1, Z.sub.2, Z.sub.3 and Z.sub.4 each is an atomic group of forming a 5- or 6-membered N-containing heterocyclic ring; R.sub.1, R.sub.2 and R.sub.4 each is an alkyl group; R.sub.3 is an alkyl, aryl or heterocyclic group; D.sub.1, D.sub.1a, D.sub.2 and D.sub.2a each is an atomic group of forming an acidic nucleus; V.sub.1 to V.sub.22 each is a hydrogen or a monovalent substituent; L.sub.1 to L.sub.12 each is a methine group; M.sub.1 and M.sub.2 each is a charge-neutralizing pair ion; m.sub.1 and m.sub.2 each is a number of 0 or more for neutralizing the charge in the molecule; n.sub.1, n.sub.2 and n.sub.4 each are 0 or 1; and n.sub.3 and n.sub.5 each is an integer of 0 or more. The material has a high sensitivity and storage stability.

REFERENCES:
patent: 2493748 (1950-01-01), Brooker et al.
patent: 3582344 (1971-06-01), Heseltine et al.
patent: 4940657 (1990-07-01), Tanaka et al.

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