G - Physics – 03 – C
Patent
G - Physics
03
C
96/112
G03C 1/005 (2006.01)
Patent
CA 1175698
-0- NOVEL SILVER CHLOROBROMIDE EMULSIONS AND PROCESSES FOR THEIR PREPARATION Abstract of the Disclosure Tabular grain silver halide emulsions are disclosed containing chloride and bromide in at least annular grain regions. The tabular grains having a thickness of less than 0.5 micron, preferably less than 0.3 micron, a diameter of at least 0.6 micron, and an average aspect ratio of at least 5:1, account for at least 35 percent of the total projected area of the total silver halide grain population. The average molar ratio of chloride to bromide in at least the annular grain regions ranges up to 2:3. The tabular grains containing chloride and bromide in at least annular grain regions are formed by main- taining a molar ratio of chloride and bromide ions of from 1.6:1 to 258:1 and the total concentration of halide ions in the reaction vessel in the range of from 0.10 to 0.90 N during introduction of silver, chloride, and bromide salts into a reaction vessel, thereby favoring the coprecipitation of chloride and bromide in a tabular crystal habit.
415264
Wey Jong-Shinn
Wilgus Herbert S. III
Eastman Kodak Company
Gowling Lafleur Henderson Llp
LandOfFree
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