Silver halide grains having small twin-plane separations
AssigneeEastman Kodak Company
InventorsDonald L. Black, Robert D. Wilson
Life of this patent
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Abstract
The invention is generally accomplished by providing a tabular-grain silver halide emulsion in which at least 50 percent of the total grain projected area is accounted for by tabular grains having a mean diameter of at least 0.6 micrometer and a spacing between at least two parallel twin planes of less than about 0.011 micrometer. In a preferred form, at least 90 percent of the total grain projected area is accounted for by the tabular grains of the invention having a mean diameter of at least 0.6 micrometer and a spacing between at least two parallel twin planes of less than 0.012 micrometer.
Claims20
A tabular-grain silver halide emulsion in which at least 50 percent of the total grain projected area is accosted for by tabular grains having a mean diameter of at least 0.6 micrometer and a spacing between two parallel twin planes of less than 0.012 micrometer wherein said tabular silver halide grains of said emulsion comprise greater than 90 percent of the total number of grains in said emulsion.
A photographic element comprised of a film support and, coated on the support, a tabular-grain silver bromoiodide emulsion in which at least 50 percent of the total grain projected area is accounted for by tabular silver bromoiodide grains containing less than 10 mole percent iodide, based on total halide, having a mean diameter of at least 0.6 micrometer and exhibiting a spacing between at least two parallel twin planes of less than about 0.11 micrometer and wherein said tabular silver bromoiodide grains in said emulsion comprise greater than 90 percent of the number of grains in said emulsion.
Dependencies are inferred from the claim text.