| 摘要 |
PURPOSE:To make it possible to disperse a photographic additive in the silver halide emulsion without remaining the coarse particle of the emulsion at the time of dispers ing a recrystallized crystal in the emulsion, and to prevent the generation of a coating trouble by being existed said additive together with a photographic additive which has a good dispersibility against water, at the time of dispersing the recrystallized crystal in the emulsion. CONSTITUTION:A water-insoluble photographic additive is dissolved in a solution which is incorporated a surfactant having -SO3 or -OSO3 group as a hydrophilic group, in an org. solvent belonging to alcohols, and then the obtd. solution is dropped into the water to recrystallize the additive. Next, the recrystallized additive is dispersed in the water contg. an another photographic additive which has the good dispersibility against the water with a dispersing device. The obtd. dispersion is incorporated in the silver halide emulsion. For example, the dispersion is carried out in the solution 2 to be dispersed which is enclosed in a tank 1 using a rotary agitator having a dissolver blade 3. Thus, the photographic additive can be incorporated in the silver halide emulsion, and the generation of the coating trouble is prevented without remaining the coarse particle of the emulsion at the time of dispersing the recrystallized particle in the emulsion. |
