Claims
- 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 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.
- 2. A heat-developable, photographic element as in claim 1 wherein said photosensitive silver halide is a gelatino photographic silver halide emulsion.
- 3. A heat-developable, photographic element as in claim 1 wherein said organic reducing agent is selected from the group consisting of hydroquinone, ascorbic acid, pyrogallol, gallic acid ester, and phenylenediamine silver halide developing agents and combinations thereof.
- 4. A heat-developable, photographic element as in claim 1 wherein said polymeric binder is a gelatino binder.
- 5. A heat-developable, photographic element as in claim 1 also comprising a toning agent.
- 6. A heat-developable, photographic element as in claim 1 also comprising a toning agent selected from the group consisting of 1,2,4-triazole, 1H-tetrazole, thiouracil and 1,3,4-thiadiazole toning agents.
- 7. A heat-developable, photographic element as in claim 1 also comprising a 5-amino-1,3,4-thiadiazole-2-thiol toning agent.
- 8. A heat-developable, photographic element as in claim 1 also comprising a 3-mercapto-1,2,4-triazole toning agent.
- 9. A heat-developable, photographic element as in claim 1 also comprising a bis(dimethylthiocarbamyl) disulfide toning agent.
- 10. A heat-developable, photographic element as in claim 1 also comprising a separate melt-forming compound.
- 11. A heat-developable, photographic element as in claim 1 also comprising a separate melt-forming compound consisting essentially of 1,3-dimethylurea.
- 12. A heat-developable, photographic element as in claim 1 also comprising a spectral sensitizing dye selected from the group consisting of anionic cyanine dyes, anionic merocyanine dyes and combinations of said dyes.
- 13. A heat-developable, photographic element as in claim 1 comprising for each mole of said photographic silver halide, 5 to 20 moles of said complex and 3 to 15 moles of said organic reducing agent.
- 14. A heat-developable, photographic element as in claim 1 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 and pAg in said element is within the range of 2 to 6.
- 15. 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.
- 16. A heat-developable, photographic composition as in claim 15 wherein said photosensitive silver halide is a gelatino photographic silver halide emulsion.
- 17. A heat-developable, photographic composition as in claim 15 wherein said organic reducing agent is selected from the group consisting of hydroquinone, ascorbic acid, pyrogallol, gallic acid esters, and phenylenediamine silver halide developing agents, and combinations thereof.
- 18. A heat-developable, photographic composition as in claim 15 wherein said polymeric binder is a gelatino binder.
- 19. A heat-developable, photographic composition as in claim 15 also comprising a toning agent.
- 20. A heat-developable, photographic composition as in claim 15 also comprising a toning agent selected from the group consisting of 1,2,4-triazole, 1H-tetrazole, thiouracil and 1,3,4-thiadiazole toning agents.
- 21. A heat-developable, photographic composition as in claim 15 also comprising a 5-amino-1,3,4-thiadiazole-2-thiol toning agent.
- 22. A heat-developable, photographic composition as in claim 15 also comprising a 3-mercapto-1,2,4-triazole toning agent.
- 23. A heat-developable, photographic composition as in claim 15 also comprising a bis(dimethylthiocarbamyl) disulfide toning agent.
- 24. A heat-developable, photographic composition as in claim 15 also comprising a separate melt-forming compound.
- 25. A heat-developable, photographic composition as in claim 15 also comprising 1,3-dimethylurea at a separate melt-forming compound.
- 26. A heat-developable, photographic composition as in claim 15 also comprising a spectral sensitizing dye selected from the group consisting of anionic cyanine dyes, anionic merocyanine dyes, and combinations of said dyes.
- 27. A heat-developable, photographic composition as in claim 15 comprising for each mole of said photographic silver halide, 5 to 20 moles of said complex and 3 to 15 moles of said organic reducing agent.
- 28. 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.
- 29. A process as in claim 28 comprising heating said element to a temperature within the range of about 120.degree. C. to about 180.degree. C. for about 1 to about 30 seconds.
- 30. A process as in claim 28 wherein said complex of silver with a nitrogen acid is represented by the formula ##STR8## 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.
- 31. A process as in claim 28 wherein said complex of silver with a nitrogen acid is represented by the formula ##STR9## 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.
- 32. 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.
- 33. 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.
- 34. 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.
- 35. 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.
- 36. 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.
- 37. 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.
- 38. 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.
- 39. 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.
- 40. 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.
- 41. 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.
Parent Case Info
This is a continuation of application Ser. No. 684,699, filed May 10, 1976, now abandoned.
US Referenced Citations (13)
Foreign Referenced Citations (3)
Number |
Date |
Country |
1453635 |
Aug 1966 |
FRX |
1205500 |
Sep 1970 |
GBX |
1389501 |
Apr 1975 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Stabilization of Photographic AgX Emulsions, Birr Focal Press, N.Y., N.Y. .COPYRGT. 1974 pp. 204-207. |
Continuations (1)
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Number |
Date |
Country |
Parent |
684699 |
May 1976 |
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