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US 5,512,426 AGranted
Emulsions with high grain surface to volume ratios
AssigneeEastman Kodak Company
InventorDavid H. Levy
Life of this patent
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Abstract
Radiation sensitive emulsions are disclosed in which surface sensitized silver halide grains are agglomerated into discrete clumps and the clumps are separated by peptizer. The emulsions exhibit a higher sensitivity than emulsions in which grains of the same mean size are individually separated by peptizer.
Claims10
A radiation sensitive emulsion comprised of a dispersing medium containing a peptizer and silver halide grains
- WHEREIN the silver halide grains
- (1) are each surface sensitized and
- (2) are agglomerated into discrete clumps with adjacent separate grains lying in direct contact, the discrete clumps being separated by the peptizer and having a mean equivalent circular diameter of less than 10 .mu.m.
A process of preparing a radiation sensitive emulsion comprising
- (1) forming silver halide grains in the absence of a peptizer,
- (2) chemically sensitizing the grains, (3) agglomerating the grains so that adjacent grains lie in direct contact, and
- (4) adding a peptizer to form discrete clumps of the grains agglomerated in step (3).
Dependencies are inferred from the claim text.