Method for preparing a photographic emulsion, and apparatus for

Details Method for preparing a photographic emulsion, and apparatus for Method for preparing a photographic emulsion, and apparatus for

1996-12-05

1998-01-20

Huff, Mark F.

Radiation imagery chemistry: process, composition, or product th

Radiation sensitive product

Silver compound sensitizer containing

430 30, 422225, 422234, G03C 1015, B01F 510

Patent

active

057099901

ABSTRACT:
The invention relates to a method and a device for preparing a photographic emulsion.
In the device of an external loop type of the invention, a solution of a first halide salt X.sub.1.sup.- is introduced at a point in the loop situated outside the reaction zone R within which the silver salt (Ag.sup.+) added to the loop precipitates almost entirely in order to produce silver halide grains or cause them to grow in said solution, the Ag.sup.+ solution being introduced into the reactor in the form of a "centered" jet within said reactor, the Reynolds number Re at the point of introduction of the Ag.sup.+ salt being between approximately 5000 and approximately 50,000.

REFERENCES:
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patent: 3482982 (1969-12-01), Miyata
patent: 3650757 (1972-03-01), Irie et al.
patent: 3655166 (1972-04-01), Sauer et al.
patent: 3790386 (1974-02-01), Posse et al.
patent: 3897935 (1975-08-01), Forster et al.
patent: 4046576 (1977-09-01), Terwilliger et al.
patent: 4147551 (1979-04-01), Finnicum et al.
patent: 4242445 (1980-12-01), Saito
patent: 4758505 (1988-07-01), Hoffmann
patent: 5104786 (1992-04-01), Chronis et al.
patent: 5334496 (1994-08-01), Pond et al.
Research Disclosure No. 36544, Sep. 1994, "Emulsion Grains and their Preparation".

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