G - Physics – 03 – C
Patent
G - Physics
03
C
96/134
G03C 1/07 (2006.01) C07D 239/48 (2006.01) C07D 251/48 (2006.01) C07D 487/04 (2006.01) G03C 1/035 (2006.01)
Patent
CA 1331303
TITLE PROCESS FOR THE PREPARATION OF OCTAHEDRAL SILVER CHLORIDE-CONTAINING EMULSIONS ABSTRACT OF THE INVENTION Process for preparing photographic emulsion comprising bringing aqueous silver and chloride- containing halide salt solutions into contact in the presence of a dispersing medium to form octahedral silver halide grains having a halide content of at least 50 mole percent chloride, based on total moles of silver present. The improvement comprises forming the grains in the presence of a crystal modifying amount of an aminoazapyridine as described in pH range of 2.5 to 9, pC1 range of 0 to 3, the aminoazapyridine compound being added after at least about 6% to about 45% of the silver salt solution has been added. The photographic emulsion is useful in x-ray, laser scanner films, as color separation elements and inverse transfer systems, etc.
575662
Sim & Mcburney
Sterling Diagnostic Imaging Inc.
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