Photothermographic element with iridium and copper doped silver halide grains
AssigneeEastman Kodak Company
InventorChaofeng Zou
Life of this patent
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Abstract
A negative-acting photothermographic element comprises a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer that contains photosensitive silver halide grains doped with iridium and copper; a non-photosensitive, reducible source of silver; a reducing agent for the non-photosensitive, reducible source of silver; and a binder. A process of forming photothermographic emulsions from doped silver halide grains by forming silver soaps in the presence of those grains is also described.
Claims27
A negative-acting photothermographic element comprising a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer comprising:
- (a) pre-formed photosensitive silver halide grains that are doped with a first doping agent that is a water-soluble iridium compound, and a second doping agent that is a copper (II) containing compound;
- (b) a non-photosensitive, reducible source of silver;
- (c) a reducing agent for the non-photosensitive, reducible source of silver;
- and
- (d) a binder.
A negative-acting photothermographic element comprising a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer comprising:
- (a) pre-formed photosensitive silver halide grains that are doped with a first doping agent that is a water-soluble iridium compound and a second doping agent that is a copper (II) containing compound;
- (b) a non-photosensitive, reducible source of silver;
- (c) a reducing agent for the non-photosensitive, reducible source of silver;
- and
- (d) a binder;
- wherein the element substantially retains its sensitometric characteristics after about 15 months under normal storage conditions.
A negative-acting photothermographic element comprising a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer comprising:
- (a) pre-formed photosensitive silver halide grains that are doped with a first doping agent that is a water-soluble iridium compound, and a second doping agent that is a copper (II) containing compound;
- (b) a non-photosensitive, reducible source of silver;
- (c) a reducing agent for the non-photosensitive, reducible source of silver;
- and
- (d) a binder;
- wherein the element substantially retains its sensitometric characteristics after about 9 months under normal storage conditions.
A negative-acting photothermographic element comprising a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer comprising:
- (a) pre-formed photosensitive silver halide grains that are doped with a first doping agent that is a water-soluble iridium compound, and a second doping agent that is a copper (II) containing compound;
- (b) a non-photosensitive, reducible source of silver;
- (c) a reducing agent for the non-photosensitive, reducible source of silver;
- and
- (d) a binder;
- wherein the element substantially retains its sensitometric characteristics after about 6 months under normal storage conditions.
A negative-acting photothermographic element comprising a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer comprising:
- (a) pre-formed photosensitive silver halide core-shell grains that are doped with a first doping agent that is a water-soluble iridium compound, and a second doping agent that is a copper (II) containing compound;
- (b) a non-photosensitive, reducible source of silver;
- (c) a reducing agent for the non-photosensitive, reducible source of silver;
- and
- (d) a binder;
- wherein the element substantially retains its sensitometric characteristics after about 9 months under normal storage conditions.
A negative-acting photothermographic element comprising a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer comprising:
- (a) pre-formed photosensitive silver halide core-shell grains that are doped with a first doping agent that is a water-soluble iridium compound, and a second doping agent that is a copper (II) containing compound;
- (b) a non-photosensitive, reducible source of silver;
- (c) a reducing agent for the non-photosensitive, reducible source of silver;
- and
- (d) a binder;
- wherein the element substantially retains its sensitometric characteristics after about 6 months under normal storage conditions.
Dependencies are inferred from the claim text.