Process for the preparation of silver halide emulsions containin

Details Process for the preparation of silver halide emulsions containin Process for the preparation of silver halide emulsions containin

1998-10-27

1999-11-02

Huff, Mark F.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430567, 430568, 430637, 430642, G03C 1015, G03C 1035, G03C 1043, G03C 1047

Patent

active

059767782

ABSTRACT:
A process of preparing a radiation-sensitive silver halide emulsion is disclosed in which the silver halide grains form dispersed clumps. A population of fine silver halide grains is precipitated at higher concentrations than previously taught for preparing this type of an emulsion by employing a peptizer limited in amount, limited in methionine content, or both. Following formation of the grains, they are aggregated into clumps by the addition of a surfactant, optionally assisted by the adding iodide, increasing pH or both. The grain clumps are stabilized against further aggregation by adding a high methionine peptizer and optionally assisted by the precipitation of additional silver halide.

REFERENCES:
patent: 4334012 (1982-06-01), Mignot
patent: 4356257 (1982-10-01), Gerber
patent: 5512426 (1996-04-01), Levy

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