Process for making a pressure fog-resistant photographic element

Details Process for making a pressure fog-resistant photographic element Process for making a pressure fog-resistant photographic element

1990-12-27

1992-12-01

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430603, 430608, G03C 1015

Patent

active

051680351

ABSTRACT:
A method for controlling pressure-induced fog in a silver bromide photographic material involves surface treatment of the emulsion AgBr grains with thiocyanate and an iodide salt. In particular, a process for making a pressure fog-resistant photographic emulsion includes steps of forming a photographic emulsion containing cubic or cubooctahedral silver bromide grains, surface-treating the AgBr grains with a thiocyanate by adding the thiocyanate to the emulsion, chemically sensitizing the emulsion, maintaining the emulsion at a temperature and for a time sufficient to allow the thiocyanate to react with the grain surfaces, and then surface-treating the AgBr grains with an iodide salt by adding the salt to the emulsion in an amount and under conditions effective to fill in cubic faces of the AgBr grains. The latter step partially or fully converts the AgBr grains to octahedral grains. A photographic element can then be made by coating the emulsion on a suitable base.

REFERENCES:
patent: 3320069 (1967-05-01), Illingsworth
patent: 4177071 (1979-12-01), DeBrabandere et al.
patent: 4247620 (1981-01-01), Nagatani et al.
patent: 4495277 (1985-01-01), Becker et al.
patent: 5017468 (1991-05-01), Joly et al.
World Patents Index Latest, Section PQ, Week 4084, Derwent Publications Ltd., London GB; Class P83, AN84-247118 & JPA59149349 (Konishiroku Photo K.K.) 27, abstract.
Abstract of Japanese Patent 59-50438, Mar. 23, 1984.
Abstract of Japanese Patent 62-18538, Jan. 27, 1987.

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