Method for desalting silver halide emulsion and silver halide emulsion prepared thereby
AssigneeKonica Corporation
InventorsYumiko Nimura, Kazuyoshi Ichikawa, Haruhiko Masutomi, Chikao Mamiya
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Abstract
A desalting method of a silver halide emulsion is disclosed, comprising removing soluble salts from the silver halide emulsion by electrodialysis, wherein said electrodialysis is carried out at a pH within a range of .+-.0.5 of an isoelectric point of a gelatin contained in the silver halide emulsion. Furthermore, by adding a salt during the course of the electrodialysis, the concentration of the emulsion is accomplished concurrently with desalting thereof.
Claims10
A method for desalting a silver halide emulsion comprising removing soluble salts from the silver halide emulsion by electrodialysis, wherein said electrodialysis is carried out at a pH within a range of .+-.0.5 of an isoelectric point of a gelatin contained in the silver halide emulsion and a salt is added to said emulsion during said electrodialysis.
A method of preparing a desalted silver halide emulsion by a process comprising (i) mixing an aqueous silver salt solution, an aqueous halide solution and an aqueous gelatin solution to produce a silver halide emulsion comprising silver halide grains having an average size of not more than 0.05 .mu.m, (ii) subjecting the silver halide emulsion to desalting which comprises removing soluble salts by applying electrodialysis to the silver halide emulsion, wherein said electrodialysis is carried out at a pH which is .+-.0.5 of an isoelectric point of a gelatin contained in said silver halide emulsion and a salt is added during said electrodialysis, and (iii) supplying said desalted silver halide emulsion, as a source of silver halide, to another emulsion comprising silver halide seed grains to cause said seed grains to grow.
Dependencies are inferred from the claim text.