Silver halide photographic materials

Details Silver halide photographic materials Silver halide photographic materials

1992-02-27

1993-04-20

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430513, 430517, 430522, 544 82, 546256, 546187, 548183, 5483654, G03C 1825

Patent

active

052042367

ABSTRACT:
The improved silver halide photographic material is provided which contains a compound of the general formula (I): ##STR1## wherein R.sub.1 and R.sub.2 each represents a hydrogen atom, an alkyl group, an aryl group, an alkenyl group or a heterocyclic group; Z.sub.1 and Z.sub.2 each represents a non-metallic atomic group necessary for forming a 5- to 7-membered ring; X.sub.1 and X.sub.2 each represents an oxygen atom, a sulfur atom or .dbd.N-R.sub.3 ; R.sub.3 is a hydrogen atom, an alkyl group, an aryl group, an alkenyl group, a heterocyclic group or --OR.sub.4 ; R.sub.4 represents a hydrogen atom, an alkyl group, an aryl group, an alkenyl group or a heterocyclic group; L.sub.1 to L.sub.5 each represents a methine group; and n.sub.1 and n.sub.2 each represents an integer of 0, 1 or 2.

REFERENCES:
patent: 3247127 (1966-04-01), Bailey et al.
patent: 4440852 (1984-04-01), Onishi et al.
patent: 4960686 (1990-10-01), Kawashima et al.

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