Silver halide emulsion sensitized with a heavy metal compound an

Details Silver halide emulsion sensitized with a heavy metal compound an Silver halide emulsion sensitized with a heavy metal compound an

1992-04-30

1994-02-01

Baxter, Janet C.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430603, 430605, G03C 109

Patent

active

052831680

ABSTRACT:
The invention is generally accomplished when a heavy metal compound and a substituted thiourea sensitizer are used together as chemical sensitizers. There is a surprising increase in photographic efficiency and, therefore, in photographic sensitivity. This effect does not depend on the presence of a dye. The preferred heavy metal compound is potassium hexachloroiridate (IV), and the preferred thiourea is 3-acetamidophenyl thiourea.

REFERENCES:
patent: 2410689 (1946-11-01), Sheppard et al.
patent: 2448060 (1948-08-01), Smith et al.
patent: 4629678 (1986-12-01), Murai
patent: 4693965 (1987-09-01), Ihama et al.
patent: 4786588 (1988-11-01), Ogawa
patent: 4810626 (1989-03-01), Burgmaier et al.
patent: 4902611 (1990-02-01), Leubner et al.
patent: 4952491 (1990-08-01), Nishikawa et al.
patent: 4997751 (1991-03-01), Kim
Abstract of European Patent 466416, Jul. 9, 1990.
Abstract of Japanese Patent 03-279940, Mar. 28, 1990.

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