G - Physics – 03 – C
Patent
G - Physics
03
C
96/96
G03C 1/005 (2006.01) G03C 5/16 (2006.01)
Patent
CA 1316036
TITLE PD-2283 PROCESS FOR PREPARING A PHOTOGRAPHIC EMULSION CONTAINING TABULAR GRAINS HAVING NARROW SIZE DISTRIBUTION ABSTRACT OF THE DISCLOSURE Process for preparing a photographic emulsion containing tabular silver halide grains which have narrow size distribution comprising: A. adding silver nitrate to a vessel containing dispersing medium/bromide mixture, initial bromide ion concentration is 0.08 to 0.25 N to form tabular seed grains; B. adding a basic silver halide solvent e.g., ammonia, ammoniacal solution, etc. to achieve 0.02 N to 0.2 N of the solvent (e.g., after at least 2% by weight of total silver nitrate hag been added); C. stopping silver nitrate addition for 0.5 to 60 minutes, e.g., bromide ion concentration is in the range of 0.005 to 0.05 N; D. neutralizing at least some of the basic silver halide solvent present; and E. adding additional silver nitrate and halide, i.e., Br- and BrI-, by balanced double jet procedure. The emulsions are used in photographic elements for x-ray, graphic arts, etc. 4357k
548682
Mccallum Brooks & Co.
Sterling Diagnostic Imaging Inc.
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