Preparation of silver halide emulsion

Abstract

Abstract PURPOSE:To stabilize a process for prepg. a silver halide emulsion by dispersing photographic additives into an aq. system, then adding a photographic additive which is insoluble in water but soluble in a surfactant to the liquid dispersion together with the surfactant. CONSTITUTION:At first, a substantially water-insoluble photographic additive is mixed with a surfactant having a hydrophilic group such as -SO3, -OSO3, and the liquid mixture is added to an aq. dispersion of a photographic additive having high dispersibility in water. Obtd. mixture of the liquid dispersion can be added to a silver halide emulsion without requiring addition of an org. solvent. Moreover, if the mixture of the liquid dispersion is added to a silver halide emulsion a silver halide emulsion of good quality is obtd. without causing generation of coagulated product, destruction of emulsified product, nor defects in a coating stage. Further, productivity of a silver halide emulsion is improved because several photographic additives having different dispersibility and insolubility in water or surface active agent can be dispersed to form one and same liquid dispersion.

Inventors

• 👤 Fumitaka Terai
• 👤 文隆 寺井
• 👤 Isamu Iwamoto
• 👤 勇 岩本

Bibliographic Details