Silver halide precipitation process with deletion of materials

Details Silver halide precipitation process with deletion of materials Silver halide precipitation process with deletion of materials

G - Physics

03

C

96/100

G03C 1/06 (2006.01) G03C 1/015 (2006.01)

Patent

CA 1137805

-0- SILVER HALIDE PRECIPITATION PROCESS WITH DELETION OF MATERALS Abstract of the Disclosure An improved silver halide precipitation process of preparing a dispersion of silver halide grains is disclosed. The process comprises forming a radiation- sensitive silver halide dispersion by reacting silver and halide salts in solution within a dispersing medium to form silver halide grain nuclei within the dispersing medium and allowing silver halide grain growth to occur in a reaction vessel in which the silver halide grain nuclei and the dispersing medium are present. The improvement comprises, while increasing silver halide present in the dispersing medium during silver halide grain growth, with- drawing a portion of the dispersion from the reaction vessel, reducing the volume of the withdrawn dispersion by separating a portion of the dispersing medium while retaining the silver halide grains within the remaining withdrawn dispersion, and returning the remaining with- drawn dispersion to the reaction vessel.

365396

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