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

1976-07-22

1978-02-21

Louie, Jr., Won H.

Gas separation: apparatus

Electric field separation apparatus

Electrode retaining or supporting means

96113, 96114, 961147, 96107, 96108, G03C 102, G03C 128

Patent

active

040750205

ABSTRACT:
A silver halide emulsion is made by continuous conversion of a more soluble silver halide into a less soluble silver halide. From a first part of up to 50% of the total amount of silver nitrate by reaction with a first water soluble halide a silver halide is precipitated consisting at least partly of a more readily soluble silver halide, e.g. silver chloride. In the presence of this more readily soluble silver halide the remaining silver nitrate is reacted with a second water soluble halide composition to form the residual silver halide (main precipitation). The amount of total halide in the precipitation is slightly more than equivalent to the amount of silver ions. However the amount of halide that forms the less readily soluble silver halide is less by at least 5 mol% than equivalent to the amount of silver ions in the precipitation medium.

REFERENCES:
patent: 2592250 (1952-04-01), Davey et al.
patent: 3761266 (1973-09-01), Milton
patent: 3935014 (1976-01-01), Klotzer et al.
Duffin; Photographic Emulsion Chemistry, The Focal Press, 11-1969, pp. 59-60.

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