Process for photographic emulsion precipitation in a recycle str

Details Process for photographic emulsion precipitation in a recycle str Process for photographic emulsion precipitation in a recycle str

1975-02-28

1979-04-03

Brammer, Jack P.

Gas separation: apparatus

Electric field separation apparatus

Electrode retaining or supporting means

96 94BF, 961147, G03C 102

Patent

active

041475518

ABSTRACT:
A process for preparing a photographic emulsion having a controlled grain size, structure and size distribution, wherein precipitation of first silver halide grains is accomplished in a stream, and partial substitution in the first silver halide grains of a second soluble halide is accomplished in a vessel by halide conversion to form mixed crystal silver halide grains. The initially formed mixed crystal silver halide grains are recycled in the stream wherein additional precipitation of the first silver halide occurs on the surfaces of the mixed crystals, which are enlarged. The enlarged crystals are fed from the recycle stream to a vessel wherein additional substitution by halide conversion is accomplished. Continuous or intermittent recycling of the mixed crystal silver halide grains, control of recycle flow rates, control of addition flow rates of silver salts and soluble halides to the process and control of excess halide concentration in the conversion vessel and recycle stream yields mixed crystal silver halide grains having a controlled grain size, structure and distribution.

REFERENCES:
patent: 3628959 (1971-12-01), Theielemann et al.
patent: 3705034 (1972-12-01), McNamara
patent: 3782954 (1974-01-01), Porter et al.
patent: 3790386 (1974-03-01), Posse et al.

Affiliated with

Also associated with

Rating

Process for photographic emulsion precipitation in a recycle str does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for photographic emulsion precipitation in a recycle str, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for photographic emulsion precipitation in a recycle str will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1745232