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US 5,965,345 AGranted
Co-dispersion of sensitizing dyes
AssigneeEastman Kodak Company
InventorsSteven George Link, John William Boettcher, Frederick Charles Derks, Heidi Melissa Viterise
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Abstract
A method of sensitizing a silver halide emulsion comprises the steps of: a) forming a co-dispersion of a first sensitizing dye and a second sensitizing dye in an aqueous medium, wherein the peak absorptance of the second dye is at least 10 nm different from the peak absorptance of the first dye, and wherein the ratio of the first dye to the second dye is from about 0.1 to 20; and b) incorporating the resulting co-dispersion in a silver halide emulsion.
Claims11
A method of sensitizing an aqueous silver halide emulsion comprising the steps of:
- a) forming a co-dispersion of a first sensitizing dye and a second sensitizing dye in an aqueous medium, in the absence of an organic solvent, wherein the peak absorptance of the second dye is at least 10 nm different from the peak absorptance of the first dye, and wherein the ratio of the first dye to the second dye is about 10:1 to 1:20;
- and
- b) incorporating the resulting co-dispersion in an aqueous silver halide emulsion;
- wherein each of the dyes is a J-aggregating dye and the dyes co-aggregate when incorporated into the silver halide emulsion to give a single intermediate peak absorptance.
1 more element
Dependencies are inferred from the claim text.