Radiation imagery chemistry: process – composition – or product th – Radiation sensitive product – Silver compound sensitizer containing
Patent
1992-10-01
1994-03-29
Baxter, Janet C.
Radiation imagery chemistry: process, composition, or product th
Radiation sensitive product
Silver compound sensitizer containing
430569, G03C 1035
Patent
active
052983846
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.
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World Patents Index Latest, Section PQ, Week 4084, Derwent Publications Ltd., London Publications, Ltd., London GB; Class P83, AN84-247118 & JPA59149349 (Konishiroku Photo K.K.) 27, Abstract.
Abstract of Japanese Patent 62-18538, Jan. 27, 1987.
Abstract of Japanese Patent 59-50438, Mar. 23, 1984.
Lushington Kenneth J.
Tandon Sucheta
Baxter Janet C.
Eastman Kodak Company
Leipold Paul A.
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