Claims
- 1. In a photographic process for forming a diffusion transfer image viewable as a reflection print which includes the steps of applying a layer of aqueous alkaline processing composition comprising a light-reflecting pigment and at least one light-absorbing pH-sensitive optical filter agent between a negative component comprising an exposed silver halide emulsion carried on a support and a positive component comprising an image-receiving layer carried on a transparent support; said layer of processing composition being effective to develop said exposed silver halide emulsion and to form a visible image in said image-receiving layer and being effective to prevent transmission of light actinic to said silver halide emulsion during development thereof; and after a predetermined time, reducing the pH of said processing composition layer to a pH effective to decolorize said pH-sensitive optical filter agent; said pH reduction being effected by an acid-reacting layer disposed in at least one of said negative and positive components;
- the improvement which comprises applying as said processing composition layer, an aqueous alkaline solution comprising a light-reflecting pigment and as at least one said light-absorbing pH-sensitive optical filter agent, a pH-sensitive indole phthalein of the formula ##STR9## wherein R is selected from alkyl, aryl, aralkyl and alkaryl, R' and R" each are selected from hydrogen, halo and --SO.sub.2 NR.sup.1 R.sup.2 provided one of said R' and R" is said --SO.sub.2 NR.sup.1 R.sup.2, R.sup.1 and R.sup.2 each are selected from hydrogen, alkyl, aryl, aralkyl and alkaryl, and X represents the carbon atoms necessary to complete phthalide or naphthalide.
- 2. A photographic process as defined in claim 1 wherein said X completes naphthalide.
- 3. A photographic process as defined in claim 2 wherein said R is alkyl.
- 4. A photographic process as defined in claim 3 wherein said R.sup.1 is hydrogen and said R.sup.2 is alkyl.
- 5. A photographic process as defined in claim 3 wherein said R.sup.1 and R.sup.2 each are alkyl.
- 6. A photographic process as defined in claim 1 wherein said processing composition additionally includes a viscosity-imparting reagent.
- 7. A photographic process as defined in claim 1 wherein said light-reflecting pigment is titanium dioxide.
- 8. A photographic process as defined in claim 1 wherein said processing composition includes a light-absorbing, pH-sensitive carboxynaphthol phthalein optical filter agent.
- 9. In a photographic film unit adapted for forming a transfer image viewable as a reflection print including a negative component comprising a photosensitive silver halide emulsion carried on a support; a positive component comprising an image-receiving layer carried on a transparent support; an acid-reacting layer disposed in at least one of said negative and positive components; and an aqueous alkaline processing composition comprising a light-reflecting pigment and at least one light-absorbing, pH sensitive optical filter agent releasably contained in a rupturable container positioned to release said composition for distribution between said negative and said positive components, the combination of said light-reflecting pigment and said optical filter agent being effective to prevent further exposure of said photosensitive emulsion during processing in the presence of radiation actinic to said emulsion and said light-reflecting pigment providing a layer after development which is effective to mask said photosensitive layer and provide a background for viewing the transfer image by reflected light;
- the improvement which comprises employing as said processing composition, an aqueous alkaline solution comprising a light-reflecting pigment and as at least one said light-absorbing pH-sensitive optical filter agent, a pH-sensitive indole phthalein of the formula ##STR10## wherein R is selected from alkyl, aryl, aralkyl and alkaryl, R' and R" each are selected from hydrogen, halo and --SO.sub.2 NR.sup.1 R.sup.2 provided one of said R' and R" is said --SO.sub.2 NR.sup.1 R.sup.2, R.sup.1 and R.sup.2 each are selected from hydrogen, alkyl, aryl, aralkyl and alkaryl, and X represents the carbon atoms necessary to complete phthalide or naphthalide.
- 10. A photographic product as defined in claim 9 wherein said X completes naphthalide.
- 11. A photographic product as defined in claim 10 wherein said R is alkyl.
- 12. A photographic product as defined in claim 11 wherein said R.sup.1 is hydrogen and said R.sup.2 is alkyl.
- 13. A photographic product as defined in claim 11 wherein said R.sup.1 and R.sup.2 each are alkyl.
- 14. A photographic product as defined in claim 9 wherein said processing composition additionally includes a viscosity-imparting reagent.
- 15. A photographic product as defined in claim 9 wherein said light-reflecting pigment is titanium dioxide.
- 16. A photographic product as defined in claim 9 wherein said processing composition includes a light-absorbing, pH-sensitive carboxynaphthol phthalein optical filter agent.
- 17. A rupturable container for use in diffusion transfer film units adapted to provide transfer images viewable by reflected light, said rupturable container releasably holding an aqueous alkaline processing composition comprising an aqueous solution of alkali metal hydroxide, a light-reflecting pigment and at least one light-absorbing, pH-sensitive optical filter agent, at least one said optical filter agent being a pH-sensitive indole phthalein of the formula ##STR11## wherein R is selected from alkyl, aryl, aralkyl and alkaryl, R' and R" each are selected from hydrogen, halo and --SO.sub.2 NR.sup.1 R.sup.2 provided one of said R' and R" is said --SO.sub.2 NR.sup.1 R.sup.2, R.sup.1 and R.sup.2 each are selected from hydrogen, alkyl, aryl, aralkyl and alkaryl, and X represents the carbon atoms necessary to complete phthalide or naphthalide.
- 18. A rupturable container releasably holding an aqueous alkaline processing composition as defined in claim 17 wherein said X completes naphthalide.
- 19. A rupturable container releasably holding an aqueous alkaline processing composition as defined in claim 17 wherein said R is alkyl.
- 20. A rupturable container releasably holding an aqueous alkaline processing composition as defined in claim 19 wherein said R.sup.1 is hydrogen and said R.sup.2 is alkyl.
- 21. A rupturable container releasably holding an aqueous alkaline processing composition as defined in claim 19 wherein said R.sup.1 and R.sup.2 each are alkyl.
- 22. A rupturable container releasably holding an aqueous alkaline processing composition as defined in claim 17 wherein said processing composition additionally includes a viscosity-imparting reagent.
- 23. A rupturable container releasably holding an aqueous alkaline processing composition as defined in claim 17 wherein said light-reflecting pigment is titanium dioxide.
- 24. A rupturable container releasably holding an aqueous alkaline processing composition as defined in claim 17 wherein said processing composition includes a light-absorbing, pH-sensitive carboxynaphthol phthalein optical filter agent.
- 25. A compound having the formula ##STR12## wherein R' and R" each are selected from hydrogen, halo and --SO.sub.2 NR.sup.1 R.sup.2 provided one of said R' and R" is said --SO.sub.2 NR.sup.1 R.sup.2, R.sup.1 and R.sup.2 each are selected from hydrogen, alkyl, aryl, aralkyl and alkaryl, R is selected from alkyl, aryl, aralkyl and alkaryl and X represents the carbon atoms necessary to complete phthalide or naphthalide.
- 26. A compound as defined in claim 25 wherein said X completes naphthalide.
- 27. A compound as defined in claim 26 wherein said R is alkyl.
- 28. A compound as defined in claim 27 wherein said R.sup.1 is hydrogen and said R.sup.2 is alkyl.
- 29. A compound as defined in claim 27 wherein said R.sup.1 and R.sup.2 each are alkyl.
Parent Case Info
This application is a continuation-in-part of copending U.S. patent application Ser. No. 752,444 filed July 3, 1985, now abandoned.
US Referenced Citations (7)
Continuation in Parts (1)
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Number |
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752444 |
Jul 1985 |
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