Heat developable imaging materials and process
AssigneeEastman Kodak Company
InventorRichard A. deMauriac
Life of this patent
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Abstract
A heat developable photographic material comprising in reactive association (a) photosensitive silver halide, (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid selected from the group consisting of imidazole, pyrazole, urazole, 1,2,4-triazole and 1H-tetrazole nitrogen acids or combinations thereof, with (ii) an organic reducing agent, and (c) a polymeric binder, provide developed images without the need for processing solutions or baths. An image can be developed in this heat developable material by merely heating the material to moderately elevated temperatures. Other addenda employed in heat developable materials can be employed with the heat developable photographic materials described.
Claims41
In a heat-developable, photographic element comprising a support having thereon in a polymeric binder and in reactive association
- (a) photosensitive silver halide, and
- (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid, with (ii) an organic reducing agent,
- the improvement wherein said nitrogen acid of said complex is a nitrogen acid selected from the group consisting of imidazole, pyrazole, urazole, 1,2,4-triazole and 1H-tetrazole nitrogen acids and combinations thereof.
In a heat-developable, photographic composition comprising in a polymeric binder and in reactive association:
- (a) photosensitive silver halide, and
- (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid, with (ii) an organic reducing agent,
- the improvement wherein said nitrogen acid of said complex is a nitrogen acid selected from the group consisting of imidazole, pyrazole, urazole, 1,2,4-triazole and 1H-tetrazole nitrogen acids and combinations thereof.
A process of developing an image in an exposed heat-developable, photographic element comprising a support having thereon in reactive association
- (a) photosensitive silver halide,
- (b) an image forming combination comprising
- (i) a complex of silver with a nitrogen acid selected from the group consisting of imidazole, pyrazole, urazole, 1,2,4-triazole and 1H-tetrazole nitrogen acid and combinations thereof with (ii) an organic reducing agent, and
- (c) a polymeric binder,
- comprising heating said element to a temperature within the range of about 120.degree. C. to about 180.degree. C. until said image is developed.
In a heat-developable, photographic element comprising a support having thereon in a polymeric binder and in reactive association
- (a) photosensitive silver halide, and
- (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid, with (ii) an organic reducing agent,
- the improvement wherein said complex of silver with a nitrogen acid is represented by the formula:
- ##STR10## wherein R is hydrogen or NH.sub.2 ;
- and wherein the ratio of said nitrogen acid to silver as silver ion in said complex is within the range of 1:1 to 3:1.
In a heat-developable, photographic element comprising a support having thereon in a polymeric binder and in reactive association
- (a) photosensitive silver halide, and
- (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid, with (ii) an organic reducing agent,
- the improvement wherein said complex of silver with a nitrogen acid is represented by the formula:
- ##STR11## wherein R.sup.1 is hydrogen, alkyl containing 1 to 20 carbon atoms, or NH.sub.2 ;
- and wherein the ratio of said nitrogen acid to silver as silver ion in said complex is within the range of 1:1 to 3:1.
In a heat-developable, photographic composition comprising in a polymeric binder and in reactive association
- (a) photosensitive silver halide, and
- (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid, with (ii) an organic reducing agent,
- the improvement wherein said complex of silver with a nitrogen acid is represented by the formula:
- ##STR12## wherein R is hydrogen or NH.sub.2 ;
- and wherein the ratio of said nitrogen acid to silver as silver ion in said complex is within the range of 1:1 to 3:1.
In a heat-developable, photographic composition comprising in a polymeric binder and in reactive association
- (a) photosensitive silver halide, and
- (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid, with (ii) an organic reducing agent,
- the improvement wherein said complex of silver with a nitrogen acid is represented by the formula:
- ##STR13## wherein R.sup.1 is hydrogen, alkyl containing 1 to 20 carbon atoms, or NH.sub.2 ;
- and wherein the ratio of said nitrogen acid to silver as silver ion in said complex is within the range of 1:1 to 3:1.
A process of developing an image in an exposed heat-developable, photographic element comprising a support having thereon in reactive association
- (a) a gelatino photosensitive silver halide emulsion,
- (b) an image-forming combination comprising
- (i) a silver salt of dodecyltetrazole, and
- (ii) an ascorbic acid developing agent,
- (c) a gelatino binder,
- (d) a toning agent consisting essentially of 5-amino-1,3,4-thiadiazole-2-diol or 3-mercapto-1,2,4-triazole, and
- (e) a melt-forming compound consisting essentially of 1,3-dimethylurea,
- comprising heating said element to a temperature within the range of about 140.degree. C. to about 165.degree. C. until said image is developed.
A process of developing an image in an exposed heat-developable, photographic element comprising a support having thereon in reactive association
- (a) a gelatino photosensitive silver halide emulsion,
- (b) an image-forming combination comprising
- (i) a complex of silver with 3-amino-1,2,4-triazole, and
- (ii) a hydroquinone developing agent,
- (c) a gelatino binder,
- (d) a toning agent consisting essentially of 5-amino-1,3,4-thiadiazole-2-thiol or 3-mercapto-1,2,4-triazole, and
- (e) a melt-forming compound consisting essentially of 1,3-dimethylurea,
- comprising heating said element to a temperature within the range of about 140.degree. C. to about 165.degree. C. until said image is developed.
A heat-developable, photographic element comprising a support having thereon in reactive association
- (a) a gelatino photosensitive silver halide emulsion,
- (b) an image forming combination comprising
- (i) a complex of silver with dodecyltetrazole, and
- (ii) an ascorbic acid developing agent,
- (c) a gelatino binder,
- (d) a toning agent consisting essentially of 5-amino-1,3,4-thiadiazole-2-thiol or 3-mercapto-1,2,4-triazole, and
- (e) a melt-forming compound consisting essentially of 1,3-dimethylurea.
A heat-developable, photographic element comprising a support having thereon in reactive association
- (a) a gelatino photosensitive silver halide emulsion,
- (b) an image-forming combination comprising
- (i) a complex of silver with 3-amino-1,2,4-triazole, and
- (ii) a hydroquinone developing agent,
- (c) a gelatino binder,
- (d) a toning agent consisting essentially of 5-amino-1,3,4-thiadiazole-2-thiol or 3-mercapto 1,2,4-triazole, and
- (e) a melt-forming compound consisting essentially of 1,3-dimethylurea.
A heat-developable, photographic composition comprising in reactive association
- (a) a gelatino photosensitive silver halide emulsion,
- (b) an image forming combination comprising
- (i) a complex of silver with dodecyltetrazole, and
- (ii) an ascorbic acid developing agent,
- (c) a gelatino binder,
- (d) a toning agent consisting essentially of 5-amino-1,3,4-thiadiazole-2-thiol or 3-mercapto-1,2,4-triazole, and
- (e) a melt-forming compound consisting essentially of 1,3-dimethylurea.
A heat-developable, photographic composition comprising in reactive association
- (a) a gelatino photosensitive silver halide emulsion,
- (b) an image-forming combination comprising
- (i) a complex of silver with 3-amino-1,2,4-triazole, and
- (ii) a hydroquinone developing agent,
- (c) a gelatino binder,
- (d) a toning agent consisting essentially of 5-amino-1,3,4-thiadiazole-2-thiol or 3-mercapto-1,2,4-triazole, and
- (e) a melt-forming compound consisting essentially of 1,3-dimethylurea.
Dependencies are inferred from the claim text.