Process for preparing monodispersed silver halide emulsions
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United States of America Patent
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Aug 1, 1995
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N/A
app pub date -
Jun 10, 1994
filing date -
Jul 2, 1993
priority date (Note) -
Expired
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Abstract
A process for preparing a monodispersed silver halide grain emulsion characterized in that said process comprises the steps of: (a) forming silver halide nuclei with single jet precipitation by adding a watersoluble silver salt solution to a reaction vessel containing a water-soluble halide salt solution in a hydrophilic colloid at a pCl of from 1.0 to 2.0 and at a temperature lower than 80.degree. C., said water-soluble silver salt solution being added in an amount of from 0.1 to 15% by weight of silver relative to the total silver, (b) stabilizing said silver halide nuclei to seed crystals for at least six minutes at a temperature lower than 80.degree. C. and at pCl of from 1.5 to 3.0 by Ostwald ripening, and (c) growing said seed crystals by double jet precipitation of silver and halide salt solutions at a constant chloride ions excess of from 30 to 70% mol and a temperature lower than 80.degree. C.
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