Process for the preparation of silver halide emulsions

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

1990-02-16

1991-05-21

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430567, G03C 102

Patent

active

050174681

ABSTRACT:
A method is disclosed for preparing silver halide emulsions useful in photography. Said method comprises the step of precipitating silver halide grains in an aqueous solution of peptizer initially and finally under pAg values suitable for forming cubic silver halide crystals characterized in that at least once during the precipitation stage the pAg is increased for at least 10 percent by weight of the total amount of silver salt used during the precipitation by at least 1.5 units to such value whereby the formation of octahedral crystals would occur if that value were to persist over the entire precipitation stage.
Preferably the increase of the pAg value is brought about after precipitation of between ten and twenty percent of the total amount of silver halide to be precipitated.

REFERENCES:
patent: 3917485 (1975-11-01), Morgan
patent: 4496652 (1985-01-01), Haugh et al.
patent: 4769315 (1988-09-01), Suda et al.

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