Process for producing photographic silver halide emulsions having a core/shell structure
AssigneeE. I. Du Pont de Nemours and Company
InventorsWolfgang Friedrich, Horst Friedel, Erhard Jury
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Abstract
The invention is a process of producing a lithographic silver halide emulsion having a core/shell structure exhibiting improved halftone dot quality and increased photographic speed, comprising: (1) precipitating a silver chloride emulsion in a protective colloid, (2) converting said silver chloride emulsion to a silver bromide emulsion, and (3) precipitating a silver chloride shell on the surfaces of the silver bromide grains.
Claims6
A process for producing a light-sensitive lithographic silver halide emulsion with a core/shell structure exhibiting improved halftone dot quality and increased photographic speed, comprising:
- (1) precipitating a silver chloride emulsion in a protective colloid, (2) converting said silver chloride emulsion into a silver bromide emulsion, and (3) precipitating a silver chloride shell on the surfaces of the silver bromide grains.
A process for producing a light-sensitive lithographic silver halide emulsion with a core/shell structure exhibiting improved halftone dot quality and increased photographic speed, comprising:
- (1) precipitating a silver chloride emulsion in a protective colloid, (2) converting said silver chloride emulsion into a silver bromide emulsion, and (3) in the presence of chloride liberated in the aforesaid conversion adding silver nitrate solution to the unwashed converted silver bromide emulsion to precipitate silver chloride on the surface of the silver bromide grains, to produce an emulsion containing grains in which a core of converted silver bromide is coated with a shell of silver chloride.
Dependencies are inferred from the claim text.