Method for stabilizing photographic dispersions in melts containing fine grain silver halide

摘要

The present invention is a method for stabilizing a photographic coating melt. The photographic melt includes an aqueous medium and a dispersed liquid organic phase containing an ultraviolet ray absorbing compound, and an emulsion containing silver halide particles having an average equivalent circular diameter of from 0.03 to 0.10 microns. The photographically useful ultraviolet ray absorber compound is soluble in a liquid organic phase and substantially insoluble in water. The method includes the step of adding to the emulsion containing silver halide particles a sufficient amount of surfactant to passify surfaces of the silver halide particles. The present invention is also a method of preparing a photographic coating melt. A dispersion is prepared which includes an aqueous medium, a dispersed liquid organic phase and an ultraviolet ray absorber compound wherein the ultraviolet ray absorber compound is soluble in the dispersed liquid organic phase and substantially insoluble in water. An emulsion is prepared containing silver halide particles having an average equivalent circular diameter of from 0.03 to 0.10 microns. A sufficient amount of surfactant to passify surfaces of the silver halide particles is added to the emulsion. The dispersion and emulsion are combined to form the photographic coating melt.