Method for producing silver halide grain and silver halide emulsion using the grain
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United States of America Patent
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Dec 24, 1996
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N/A
app pub date -
Jul 13, 1995
filing date -
Jul 14, 1994
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Abstract
Disclosed is a method for producing silver halide grains containing tabular grains having a thickness of from 0.02 to 0.3 .mu.m and an aspect ratio (diameter/thickness) of from 2 to 50 at a proportion of from 75 to 100% of the total projected area of silver halide grains, which comprises at least nucleation, ripening and growing steps in a dispersion medium solution consisting of water and a dispersion medium, wherein gelatin having the following characteristics (a) occupies from 30 to 100 wt % of said dispersion medium used in said growing step: characteristics (a) the relation between the number percentage of a chemically modified --NH.sub.2 group in the gelatin and the methionine content of the gelatin is in the region a.sub.1 depicted in FIG. 1. Also disclosed is a silver halide emulsion comprising at least a dispersion medium and silver halide grains produced by the above-described method.
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