Inherently stable high chloride tabular grains with improved blue absorption
AssigneeEastman Kodak Company
InventorsThomas B. Brust, Paul J. Madigan
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Abstract
A radiation sensitive emulsion is disclosed that improves the light absorption of high chloride tabular grain emulsions in the longer wavelength half of the blue spectrum. The tabular grains each have a tabular substrate portion containing at least 50 mole percent chloride, based on silver, bounded by {100} major faces and a portion deposited on the substrate containing a silver salt exhibiting a higher solubility than silver iodide and a higher absorption of blue light at wavelengths longer than 450 nm than silver iodide.
Claims20
A radiation sensitive emulsion containing a silver halide grain population, at least 50 percent of the grain population projected area being accounted for by tabular grains each having an aspect ratio of at least 2,
- wherein the tabular grains are each comprised of
- (1) a tabular substrate containing at least 50 mole percent chloride, based on silver, bounded by {100} major faces and
- (2) a portion deposited uniformly on the major faces of the substrate containing a silver salt exhibiting a higher solubility than silver iodide and a higher absorption of blue light at wavelengths longer than 450 nm than silver iodide.
A radiation sensitive emulsion containing a silver halide grain population, at least 50 percent of the grain population projected area being accounted for by tabular grains each having an aspect ratio of at least 2,
- wherein the tabular grains are each comprised of
- (1) a tabular substrate containing at least 50 mole percent chloride, based on silver, bounded by {100} major faces and
- (2) a portion deposited on the substrate comprised of silver phosphate and containing at least 0.1 mole percent iodide, thereby exhibiting a higher solubility than silver iodide and a higher absorption of blue light at wavelengths longer than 450 nm than silver iodide.
Dependencies are inferred from the claim text.