Claims
- 1. A photographic processing composition comprising an aqueous alkaline processing solution having dissolved therein a silver halide developing agent and as a silver halide solvent, a compound of the formula ##STR11## wherein R.sup.1 is lower alkyl, R.sup.2 is hydrogen, lower alkyl or --CH.sub.2).sub.m S--R.sup.o wherein R.sup.o is lower alkyl and m is a whole number 2 to 5; and X represents the residue of a 1-piperazine.
- 2. A photographic processing composition as defined in claim 1 wherein said X represents ##STR12## wherein A is a halide or a sulfonate, R.sup.3 is hydrogen or lower alkyl and R.sup.4 and R.sup.5 each are lower alkyl.
- 3. A photographic processing composition as defined in claim 2 wherein said R.sup.2 is hydrogen.
- 4. A photographic processing composition as defined in claim 2 wherein said R.sup.2 is --CH.sub.2).sub.m S--R.sup.o.
- 5. A photographic processing composition as defined in claim 4 wherein m is 2.
- 6. A photographic processing composition as defined in claim 4 wherein m is 3.
- 7. A photographic processing composition as defined in claim 3 wherein said silver halide solvent is ##STR13##
- 8. A photographic processing composition as defined in claim 3 wherein said siliver halide solvent is ##STR14##
- 9. A photographic processing composition as defined in claim 3 wherein said silver halide solvent is ##STR15##
- 10. A photographic processing composition as defined in claim 3 wherein said silver halide solvent is ##STR16##
- 11. A photographic processing composition as defined in claim 4 wherein said silver halide solvent is ##STR17##
- 12. A photographic processing composition as defined in claim 1 which additionally includes a viscosity-increasing reagent.
- 13. A photographic process for forming a water-soluble complex silver salt with the unexposed and undeveloped silver halide of an imagewise exposed and developed but unfixed photosensitive silver halide layer carried on a support which comprises treating said silver halide layer with an aqueous alkaline processing composition including therein as a silver halide solvent, a compound of the formula ##STR18## wherein R.sup.1 is lower alkyl, R.sup.2 is hydrogen, lower alkyl or --CH.sub.2).sub.m S--R.sup.o wherein R.sup.o is lower alkyl and m is a whole number 2 to 5; and X represents the residue of a 1-piperazine.
- 14. A photographic process as defined in claim 13 wherein said X represents ##STR19## wherein A is a halide or a sulfonate, R.sup.3 is hydrogen or lower alkyl and R.sup.4 and R.sup.5 each are lower alkyl.
- 15. A photographic process as defined in claim 13 wherein R.sup.2 is hydrogen.
- 16. A photographic process as defined in claim 13 wherein R.sup.2 is --CH.sub.2).sub.m S--R.sup.o.
- 17. A photographic process as defined in claim 16 wherein m is 2.
- 18. A photographic process as defined in claim 16 wherein m is 3.
- 19. A photographic process as defined in claim 15 wherein said silver halide solvent is ##STR20##
- 20. A photographic process as defined in claim 15 wherein said silver halide solvent is ##STR21##
- 21. A photographic process as defined in claim 15 wherein said silver halide solvent is ##STR22##
- 22. A photographic process as defined in claim 15 wherein said silver halide solvent is ##STR23##
- 23. A photographic process as defined in claim 16 wherein said silver halide solvent is ##STR24##
- 24. A diffusion transfer photographic process comprising the steps of:
- 1. reacting exposed silver halide of an imagewise exposed photosensitive silver halide emulsion layer carried on a support with a silver halide developing agent in aqueous alkaline solution;
- 2. reacting unreduced silver halide of said photosensitive emulsion with as a silver halide solvent, a compound of the formula ##STR25## wherein R.sup.1 is lower alkyl, R.sup.2 is hydrogen, lower alkyl or --CH.sub.2)S--R.sup.o wherein R.sup.o is lower alkyl and m is a whole number 2 to 5; and X represents the residue of a 1-piperazine to form a complex silver salt that is soluble in said alkaline solution;
- 3. transferring said complex silver salt to a superposed image-receiving layer; and
- 4. reducing said transferred complex silver salt to provide a silver image.
- 25. A photographic process as defined in claim 24 wherein said X represents ##STR26## wherein A is a halide or a sulfonate; R.sup.3 is hydrogen or lower alkyl and R.sup.4 and R.sup.5 each are lower alkyl.
- 26. A photographic process as defined in claim 25 wherein R.sup.2 is hydrogen.
- 27. A photgraphic process as defined in claim 25 wherein R.sup.2 is --CH.sub.2).sub.m S--R.sup.o.
- 28. A photographic process as defined in claim 27 wherein m is 2.
- 29. A photographic process as defined in claim 27 wherein m is 3.
- 30. A photographic process as defined in claim 26 wherein said silver halide solvent is ##STR27##
- 31. A photographic process as defined in claim 26 wherein said silver halide solvent is ##STR28##
- 32. A photographic process as defined in claim 26 wherein aid silver halide solvent is ##STR29##
- 33. A photographic process as defined in claim 26 wherein said silver halide solvent is ##STR30##
- 34. A photographic process as defined in claim 27 wherein said silver halide solvent is ##STR31##
- 35. A photographic process as defined in claim 24 with additionally includes a viscosity-increasing reagent in said aqueous alkaline solution.
- 36. A photographic product which comprises a first sheet-like element comprising a photosensitive silver halide emulsion layer on a support; a second sheet-like element adapted to be superposed with said first sheet-like element and means for retaining an aqueous alkaline processing solution so positioned as to distribute said processing solution between said first and second sheet-like elements, at least one of said elements and said processing solution containing a silver halide solvent which forms a silver complex soluble in said aqueous alkaline solution, said silver halide solvent being a compound of the formula ##STR32## wherein R.sup.1 is lower alkyl, R.sup.2 is hydrogen, lower alkyl or --CH.sub.2).sub.m S--R.sup.o wherein R.sup.o is lower alkyl and m is a whole number 2 to 5; and X represents the residue of a 1-piperazine, said product including a silver halide developing agent in said processing composition.
- 37. A photographic product as defined in claim 36 wherein said X represents ##STR33## wherein A is a halide or a sulfonate, R.sup.3 is hydrogen or lower alkyl and R.sup.4 and R.sup.5 each are lower alkyl.
- 38. A photographic product as fined in claim 37 wherein R.sup.2 is hydrogen.
- 39. A photographic product as defined in claim 37 wherein R.sup.2 is --CH.sub.2).sub.m S--R.
- 40. A photographic product as defined in claim 39 wherein m is 2.
- 41. A photographic product as defined in claim 39 wherein m is 3.
- 42. A photographic product as defined in claim 38 wherein said silver halide solvent is ##STR34##
- 43. A photographic product as defined in claim 38 wherein said silver halide solvent is ##STR35##
- 44. A photographic product as defined in claim 38 wherein said silver halide solvent is ##STR36##
- 45. A photographic product as defined in claim 38 wherein said silver halide solvent is ##STR37##
- 46. A photographic product as defined in claim 39 wherein said silver halide solvent is ##STR38##
- 47. A photographic product as defined in claim 36 wherein one of said first and second sheet-like elements additionally includes an image-receiving layer.
- 48. A photographic product as defined in claim 47 wherein said image-receiving layer is included in said second sheet-like element.
- 49. A photographic product as defined in claim 48 wherein said image-receiving layer is a dye image-receiving layer and said first sheet-like element additionally includes a photographically inert compound capable of undergoing cleavage in the presence of silver ions and/or soluble silver complex to liberate a diffusible dye.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of my copending application Ser. No. 564,167 filed Apr. 1, 1975, now abandoned.
US Referenced Citations (3)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
564167 |
Apr 1975 |
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