G - Physics – 03 – C
Patent
G - Physics
03
C
96/96
G03C 1/035 (2006.01) G03C 1/005 (2006.01)
Patent
CA 1316035
TITLE PD-2375 PROCESS FOR PREPARING A PHOTOGRAPHIC EMULSION CONTAINING TABULAR GRAINS EXHIBITING HIGH SPEED ABSTRACT OF THE DISCLOSURE Process for preparing a photographic emulsion containing tabular silver halide grains, which exhibit high speed upon sensitization having a thickness of about 0.05 to 0.5 µm, average grain volume of about 0.05 to 1.0 µm3 and mean aspect ratio of greater than 2:1 comprising A. adding silver nitrate to a vessel containing dispersing medium/bromide mixture, initial bromide ion concentration 0.08 to 0.25 N, to form tabular seed grains; B. adding an ammoniacal base solution, to achieve 0.002 to 0.2 normal of the base (e.g., after at least 2% of total silver nitrate has been added); and C. adding additional silver nitrate and halide, i.e., Br- or BrI- by balanced double jet procedure. The emulsions are used in photographic elements for x-ray, graphic arts, etc. 4246k
548681
Mccallum Brooks & Co.
Sterling Diagnostic Imaging Inc.
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