Control process and apparatus for the formation of silver halide

Details Control process and apparatus for the formation of silver halide Control process and apparatus for the formation of silver halide

1989-12-21

1991-07-30

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430567, G03C 1015

Patent

active

050359916

ABSTRACT:
A control process and apparatus for the formation of silver halide grains comprising a mixer disposed outside of a reaction vessel containing an aqueous protective colloid solution and causing a nucleus formation (nucleation) and/or a crystal growth of silver halide grains. The process and apparatus further include: supplying an aqueous solution of a water-soluble silver salt, an aqueous solution of water-soluble halide(s), and an aqueous solution of a protective colloid to the mixer through supply conduits while controlling the flow rates of the solutions; mixing them while controlling the rotational speed of a stirrer of the mixer to form fine, silver halide grains; and immediately supplying the fine grains into the reaction vessel through a conduit connecting the mixer to the reaction vessel to perform the nucleus formation and/or the crystal growth of the silver halide grains in the reaction vessel. The control process and apparatus further comprise measuring the silver ion potential of the fine grains formed in the mixer or the silver ion potential in the reaction vessel with an electrode, and controlling the flow rate of at least one of the aqueous silver salt solution, the aqueous halide solution, and the aqueous protective colloid solution being added to the mixer, such that the measured value equals a predetermined value.

REFERENCES:
patent: 3821002 (1974-06-01), Culhane et al.
patent: 4879208 (1989-11-01), Urabe
Patent Abstracts of Japan, vol. 10, No. 300 (P-506)(2356), Oct. 14, 1986 and JP-A-61 11533 (Konishiroku Photo Ind. Co. Ltd.), Jun. 4, 1986, *whole document*.
Chemical Abstracts, vol. 108, No. 12, Mar. 21, 1988, Columbus, Ohio, U.S.A., p. 163; Ref. No. 97240N and JP-62-275023 (Fuji) *abstract*.
European Search Report No. EP 89 12 3808, May 7, 1990.

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