Claims
- 1. A thermographic recording film comprising a support carrying:
- (a) a thermographic image-forming system comprising at least one layer;
- (b) a protective layer positioned above said image-forming system or positioned below the surface of said support opposite that which carries said image-forming system, and comprising: at least one colloidal silica, and a binder; and
- (c) a washcoat layer positioned over the surface of said protective layer which is remote from said support, said washcoat layer comprising: a compound containing at least two epoxide moieties and at least one quaternary ammonium salt including at least one hydroxyl functional group.
- 2. A thermographic recording film according to claim 1 further characterized by said quaternary ammonium salt including a pendent fatty acid chain.
- 3. A thermographic recording film according to claim 2 wherein said fatty acid chain includes an amide.
- 4. A thermographic recording film according to claim 3 wherein said quaternary ammonium salt is stearamidopropyldimethyl-B-hydroxyammonium nitrate.
- 5. A thermographic recording film according to claim 1 wherein said washcoat layer further includes a lubricant.
- 6. A thermographic recording film according to claim 5 wherein said lubricant comprises polytetrafluoroethylene.
- 7. A thermographic recording film according to claim 1 wherein said washcoat layer further includes a surfactant.
- 8. A thermographic recording film according to claim 1 wherein said compound containing at least two epoxide moieties is a diepoxy crosslinking compound.
- 9. A thermographic recording film according to claim 8 wherein said diepoxy crosslinking compound is bis (3,4-epoxycyclohexyl)adipate.
- 10. A thermographic recording film according to claim 8 wherein said diepoxy crosslinking compound is 1,4-butanediol diglycidyl ether.
- 11. A thermographic recording film according to claim 1 wherein said protective layer further includes a compound containing at least two epoxide moieties.
- 12. A thermographic recording film according to claim 11 wherein said compound containing at least two epoxide moieties is a diepoxy crosslinking compound.
- 13. A thermographic recording film according to claim 12 wherein said diepoxy crosslinking compound is bis (3,4-epoxycyclohexyl)adipate.
- 14. A thermographic recording film according to claim 12 wherein said diepoxy crosslinking compound is 1,4-butanediol diglycidyl ether.
- 15. A thermographic recording film according to claim 1 wherein said protective layer includes at least two colloidal silicas having different average particle diameters.
- 16. A thermographic recording film according to claim 1 wherein said protective layer further includes a compound containing at least two diepoxide moleties and wherein in said protective layer the ratio of total silica to said compound containing at least two epoxide moleties [being]is at least about 2:1 by weight.
- 17. A thermographic recording film according to claim 1 wherein said colloidal silica is fumed colloidal silica.
- 18. A thermographic recording film according to claim 1 wherein said binder in said protective layer is water-insoluble.
- 19. A thermographic recording film according to claim 18 wherein said binder in said protective layer is an aliphatic polyurethane.
- 20. A thermographic recording film according to claim 1 wherein said binder in said protective layer is water-soluble.
- 21. A thermographic recording film according to claim 20 wherein said binder in said protective layer is polyvinylalcohol.
- 22. A thermographic recording film according to claim 1 wherein said protective layer includes a surfactant.
- 23. A thermographic recording film according to claim 1 wherein said protective layer includes a lubricant.
- 24. A thermographic recording film according to claim 23 wherein said lubricant is polytetrafluoroethylene.
- 25. A thermographic recording film according to claim 1 wherein said Lewis acid material comprises a source of silver ions.
- 26. A thermographic recording film according to claim 25 wherein said source of silver ions comprises an organic silver salt.
- 27. A thermographic recording film according to claim 26 wherein said organic silver salt is silver behenate.
- 28. A thermographic recording film according to claim 1 wherein said image-forming system comprises a di- or triarylmethane thiolactone dye precursor, a Lewis acid material, an organic acidic material, and a binder.
- 29. A thermographic recording film according to claim 1 wherein said washcoat layer includes a plurality of quaternary ammonium salts.
- 30. A thermographic recording film according to claim 28 wherein said organic acidic material comprises 3,5-dihydroxybenzoic acid.
- 31. A thermographic recording film comprising a support carrying in sequence:
- (a) a thermographic image-forming system comprising at least one layer and including a di- or triarylmethane thiolactone dye precursor and an organic silver salt;
- (b) a protective layer positioned above said image-forming system and comprising: at least one colloidal silica, and a binder; and
- (c) a washcoat layer positioned above said protective layer, said washcoat layer comprising: a compound containing at least two epoxide moieties and at least one quaternary ammonium salt including at least one hydroxyl functional group.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of application Ser. No. 08/161,146, filed Dec. 2, 1993, now abandoned.
US Referenced Citations (14)
Foreign Referenced Citations (2)
Number |
Date |
Country |
0250558 |
Feb 1990 |
EPX |
0521423 |
Jan 1993 |
EPX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
161146 |
Dec 1993 |
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