Process of producing silver halide photographic emulsions
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United States of America Patent
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Apr 12, 2005
Grant Date -
Dec 18, 2003
app pub date -
Apr 25, 2003
filing date -
Apr 26, 2002
priority date (Note) -
Expired
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Abstract
A process of producing a silver halide photographic emulsion containing tabular silver halide grains having an aspect ratio of 5 or more, which comprises using silver halide fine grains as prepared by the following method in at least one of a nucleation step and a growth step of the production of silver halide emulsion, the method comprising mixing at least a silver salt aqueous solution and a halide aqueous solution to prepare silver halide fine grains, wherein one of the silver salt aqueous solution and the halide aqueous solution is introduced as a jet flow into a mixer; a region where the jet flow slows down is provided within the mixer; and the other solution is introduced into the jet flow before the velocity of the jet flow has become 1/10 of the velocity at the time when the jet flow comes into the slowing-down region.
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