Iodide banded tabular grain emulsion
AssigneeEastman Kodak Company
InventorsThomas B. Brust, Mark R. Mis
Life of this patent
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Abstract
A radiation sensitive emulsion is disclosed containing a high chloride {100} tabular grain population in which the tabular grains contain bands of higher iodide.
Claims11
A radiation sensitive emulsion containing a silver halide grain population comprised of at least 50 mole percent chloride, based on silver, wherein at least 50 percent of the grain population projected area is accounted for by tabular grains
- (1) bounded by {100} major faces having adjacent edge ratios of less than 10 and
- (2) each having an aspect ratio of at least 2;
- wherein
- (3) each of the tabular grains is comprised of a core and a surrounding band containing a higher level of iodide ions and containing up to 30 percent of the silver in the tabular grain.
A radiation sensitive emulsion containing a silver halide grain population comprised of at least 50 mole percent chloride, based on silver, wherein at least 50 percent of the grain population projected area is accounted for by tabular grains
- (1) bounded by {100} major faces having adjacent edge ratios of less than 10 and
- (2) each having an aspect ratio of at least 2;
- wherein
- (3) each of the tabular grains is comprised of a core and a surrounding band containing a higher level of iodide ions and
- (4) each band is surrounded by a shell of lower iodide ion content.
A radiation sensitive emulsion containing a silver halide grain population comprised of at least 50 mole percent chloride, based on silver, wherein at least 50 percent of the grain population projected area is accounted for by tabular grains
- (1) bounded by {100} major faces having adjacent edge ratios of less than 10 and
- (2) each having an aspect ratio of at least 2;
- wherein
- (3) each of the tabular grains is comprised of a core and a surrounding band containing a higher level of iodide ions;
- (4) the core accounts for at least 50 percent of the total grain silver;
- and
- (5) the band contains sufficient iodide to increase the average iodide concentration of the grain to a level that exceeds that of the core by at least 0.1 mole percent.
A radiation sensitive emulsion containing a silver halide grain population comprised of at least 50 mole percent chloride, based on silver, wherein at least 50 percent of the grain population projected area is accounted for by tabular grains
- (1) bounded by {100} major faces having adjacent edge ratios of less than 10 and
- (2) each having an aspect ratio of at least 2;
- wherein
- (3) each of the tabular grains is comprised of a core and a surrounding band containing a higher level of iodide ions;
- (4) the band accounts for up to 5 percent of silver;
- and
- (5) the band contains sufficient iodide to increase the average iodide concentration of the grain to a level that exceeds that of the core by at least 0.1 mole percent.
Dependencies are inferred from the claim text.