Patent ID: 6171738
Filing Date: 2001-01-09
Classification: G03C

Abstract:
A method for the preparation of a silver halide emulsion comprisingintroducing a silver salt and a halide into a reaction zone whereby silver halide grains are first formed and subsequently grown, said silver halide grains having a mean intergrain distance;controlling said mean intergrain distance by ultrafiltration during silver halide grain growth so that said mean intergrain distance is 0.6 to 1.15 times the mean intergrain distance at the start of said silver halide grain growth; thereby forming a permeating solution;introducing dislocation lines into said silver halide grains when said mean intergrain distance is 0.6 to 0.8 times the mean intergrain distance at the start of said silver halide grain growth,wherein:mean intergrain distance=(volume of a reaction mixture solution/number of grains in the reaction mixture solution).sup.1/3.