Method for producing a silver halide photographic emulsion
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United States of America Patent
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-
Oct 7, 2003
Grant Date -
Jan 31, 2002
app pub date -
Apr 24, 2001
filing date -
Apr 25, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention is directed to a method for producing a silver halide photographic emulsion comprising the step of reacting a water-soluble silver salt and at least one water-soluble halide salt containing chloride or bromide in aqueous solution in the presence of an organic Grain Growth Modifier (GGM) compound, containing a halide X, which halide is not released in the form of an ion, to form light-sensitive silver halide grains having a silver halide content of a least 50 mole %, said grain growth modifier compound being water-soluble with a solubility>4 mmole per liter, and being selected from the group of compounds with an aliphatic or cyclo-aliphatic backbone R to which is attached one or more halide groups and at least one polar group.
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