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US 6,114,105 AGranted
High bromide tabular grain emulsions with edge placement of epitaxy
AssigneeEastman Kodak Company
InventorsThomas B. Brust, Bernard D. Stich
Life of this patent
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Abstract
A high bromide {111} tabular grain emulsion is disclosed in which most of the tabular grains exhibit silver salt epitaxy at a single site. Most of the silver halide epitaxy sites contact an edge region of the tabular grains. These emulsions exhibit chemical sensitization by the epitaxy and surprising lower levels of desensitization by spectral sensitizing dyes.
Claims12
An emulsion comprised of high bromide silver halide grains and a dispersing medium,
- tabular silver halide grains having {111} major faces accounting for greater than 50 percent of total grain projected area,
- any iodide at the major faces of the tabular grains being uniformly distributed and any iodide in a surface region accounting for 40 percent of total silver amounting to less than 7 mole percent, based on silver in the surface region,
- greater than 50 percent of the tabular grains serving as a host for silver halide epitaxy at a single site on a major face of the host tabular grains,
- the silver halide epitaxy contains a chloride content that is at least 10 mole percent higher than that of the host tabular grains, and
- greater than 50 percent of the silver halide epitaxy sites contacting an edge region of the host tabular grains.
2 more elements
Dependencies are inferred from the claim text.