Silver halide photosensitive materials containing thiourea and a

Details Silver halide photosensitive materials containing thiourea and a Silver halide photosensitive materials containing thiourea and a

1988-03-29

1989-03-07

Schilling, Richard L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430600, 430603, G03C 110

Patent

active

048106267

ABSTRACT:
A photographic silver halide emulsion comprising a 1,1,3,3-tetrasubstituted middle chalcogen urea compound is described wherein at least one substituent comprises a nucleophilic center. The urea compound is an effective chemical sensitizing agent. A process for chemically sensitizing silver halide is also described.

REFERENCES:
patent: 1623499 (1927-04-01), Sheppard et al.
patent: 3598598 (1971-08-01), Herz
patent: 4221863 (1980-09-01), Overman et al.
patent: 4284712 (1981-08-01), Toya et al.
patent: 4469783 (1984-09-01), Kuwabara et al.
patent: 4749656 (1988-06-01), Herz et al.

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