Patent
Direct thermographic materials with crosslinked carrier layer
| العنوان: | Direct thermographic materials with crosslinked carrier layer |
|---|---|
| Patent Number: | 7,297,658 |
| تاريخ النشر: | November 20, 2007 |
| Appl. No: | 11/166291 |
| Application Filed: | June 24, 2005 |
| مستخلص: | A direct thermographic material has one or more thermographic layers comprising a film-forming polymer binder on a polymeric support. Disposed between the polymeric support and the one or more thermographic layers is a non-light sensitive adhesive layer comprising one or more polyisocyanate crosslinked hydrophobic polymer binders. |
| Inventors: | Baird, David G. (Woodbury, MN, US); Kenney, Raymond J. (Woodbury, MN, US); Moose, Scott C. (Victor, NY, US) |
| Assignees: | Carestream Health, Inc. (Rochester, NY, US) |
| Claim: | 1. A direct thermographic material comprising a polymeric support and having thereon one or more thermographic layers comprising a film-forming polymer binder, and disposed between said polymeric support and said one or more thermographic layers, a non-light sensitive adhesive layer comprising a polyisocyanate-crosslinked hydrophobic polymer binder that is the reaction product of a polyisocyanate crosslinking agent with reactive sites of one or more hydrophobic polymer binders, and wherein said polyisocyanate crosslinking agent is a compound represented by the following Structure I: O═C═N—L—(N═C═O) m (I) wherein L is a linking group comprising an alkylene group having at least 6 carbon atoms, a cycloalkylene group, or an arylene group, and m is an integer of at least 1. |
| Claim: | 2. The material of claim 1 that is a black-and-white thermographic material comprising a non-photosensitive source of reducible silver ions and a reducing agent dispersed in a hydrophobic, organic solvent soluble binder. |
| Claim: | 3. The material of claim 1 wherein said arylene group comprises a carbocyclic aromatic group and m is 1, 2, or 3. |
| Claim: | 4. The material of claim 3 wherein L is a phenylene group and m is 1 or 2. |
| Claim: | 5. The material of claim 1 wherein said polyisocyanate crosslinking agent is one or more of the following compounds: toluene (2,4 or 2,6)-diisocyanate and derivatives thereof, naphthalene 1,5-diisocyanate, 4,4′-diisocyanatodiphenylmethane, p-phenylene diisocyanate, triphenylmethane triisocyanate, tris-(4-isocyanatophenyl)thiophosphate, 3,3′-dimethyl-4,4′-biphenyl diisocyanate, and 3,3′-dimethoxy-4,4′-biphenyl diisocyanate. |
| Claim: | 6. The material of claim 1 wherein said polyisocyanate-crosslinked hydrophobic polymer binder that is the reaction product of a polyisocyanate crosslinking agent with reactive sites of a hydrophobic polymer binder in the presence of a tertiary amine or transition metal catalyst. |
| Claim: | 7. The material of claim 1 wherein said non-light sensitive adhesive layer comprises a single-phase mixture of two or more hydrophobic polymer binders that include a first polymer serving to promote adhesion of said adhesive layer to said polymeric support, and a second polymer, wherein said first and second polymers are different polymers, wherein said first polymer is a polyvinyl acetal, cellulosic polymer, polyester, polycarbonate, epoxy resin, rosin polymer, polyketone resin, vinyl polymer, or maleic anhydride ester copolymer, and said second polymer is a polyvinyl acetal, cellulosic polymer, vinyl polymer, or maleic anhydride-ester copolymer, and wherein at least one of said two or more polymer binders is a polyisocyanate-crosslinked hydrophobic polymer. |
| Claim: | 8. The material of claim 7 wherein said first polymer is a polyester and said second polymer is a polyisocyanate-crosslinked polyvinyl acetal or cellulosic polymer. |
| Claim: | 9. The material of claim 7 wherein said second polymer is compatible with said film-forming polymer binder of said one or more thermographic layers. |
| Claim: | 10. The material of claim 1 wherein said one or more thermographic layers and said non-light sensitive adhesive layer independently contain at least one polyvinyl acetal or cellulosic polymer binder. |
| Claim: | 11. The material of claim 1 wherein said non-light sensitive adhesive layer has a dry thickness of from about 0.005 to about 5 μm. |
| Claim: | 12. The material of claim 1 that is duplitized and has the same or different one or more thermographic layers and non-light-sensitive adhesive layers on both sides of said polymeric support. |
| Claim: | 13. The material of claim 1 wherein said one or more thermographic layers and said non-light sensitive adhesive layer are disposed on only one side of said polymeric support, and one or more non-light sensitive layers are disposed on the backside of said polymeric support, at least one of said backside layers comprises an antistatic agent. |
| Claim: | 14. The material of claim 13 wherein at least one of said non-light sensitive backside layers is a buried antistatic layer comprising metal oxide particles or electronically conductive polymer particles. |
| Claim: | 15. The material of claim 1 further comprising an outermost layer disposed over said one or more thermographic layers, said outermost layer comprising matte particles, a lubricant, thermomeltable particles, or any combination thereof. |
| Claim: | 16. A black-and-white direct thermographic material comprising an uncoated and untreated polyester support and having on only one side thereof: a thermographic layer comprising a non-photosensitive source of reducible silver ions that includes at least highly crystalline silver behenate and a reducing agent for producing a silver image, all distributed in a film-forming polyvinyl acetal or cellulosic polymer binder, an outermost layer disposed over said thermographic layer, said outermost layer comprising matte particles and a lubricant mixture distributed in a cellulosic polymer binder, disposed between said polymeric support and said thermographic layer, a non-light sensitive adhesive layer comprising a polyisocyanate-crosslinked hydrophobic polymer binder that is the reaction product of a polyisocyanate crosslinking agent with reactive sites of at least one of two or more hydrophobic polymer binders, that include a first polymer serving to promote adhesion of said adhesive layer to said polymeric support, and a second polymer, wherein said first and second polymers are different polymers, wherein said first polymer is a polyvinyl acetal, cellulosic polymer, polyester, polycarbonate, epoxy resin, rosin polymer, polyketone resin, vinyl polymer, or maleic anhydride ester copolymer, and said second polymer is a polyvinyl acetal, cellulosic polymer, vinyl polymer, or maleic anhydride-ester copolymer, and said polyisocyanate crosslinking agent comprising one or more of the following aromatic polyisocyanates in an amount of from about 10 to about 30% based on the total dry weight of said single-phase mixture: toluene (2,4 or 2,6)-diisocyanate and derivatives thereof, naphthalene 1,5-diisocyanate, 4,4′-diisocyanatodiphenylmethane, p-phenylene diisocyanate, triphenylmethane triisocyanate, tris-(4-isocyanatophenyl)thiophosphate, 3,3′-dimethyl-4,4′-biphenyl diisocyanate, and 3,3′-dimethoxy-4,4′-biphenyl diisocyanate. |
| Claim: | 17. A method of providing a visible image comprising contacting the thermographic material of claim 1 with a thermal imaging source. |
| Claim: | 18. The method of claim 17 wherein said thermal imaging source is a thermal print-head, and said thermographic material has a non-thermally sensitive outermost protective layer disposed over said one or more thermographic layers that has a dynamic coefficient of friction of less than 0.3 when said material is moved in contact with and relative to said thermal print-head. |
| Claim: | 19. A method of manufacturing a direct thermographic material comprising: A) applying to a polymeric support, a non-light sensitive adhesive layer formulation to form a non-light sensitive adhesive layer, said non-light sensitive adhesive layer formulation comprising a crosslinkable hydrophobic polymer binder and a polyisocyanate crosslinking agent that is reactive with reactive sites of said crosslinkable hydrophobic polymer binder, said polyisocyanate crosslinking agent being present in an amount of at least 10% based on total dry weight of said crosslinkable hydrophilic polymer binder, and B) subsequently or simultaneously, applying one or more thermographic layer formulations comprising a film-forming polymer binder over said non-light-sensitive adhesive layer. |
| Claim: | 20. The method of claim 19 wherein said non-light sensitive adhesive layer formulation further comprises a tertiary amine catalyst. |
| Current U.S. Class: | 503/201 |
| Patent References Cited: | 5275932 January 1994 Weigel et al. 5468603 November 1995 Kub 5578548 November 1996 Bjork et al. 5686228 November 1997 Murray et al. 6313065 November 2001 Horsten et al. 6436622 August 2002 Geisler 2004/0043338 March 2004 Yanagisawa 0 600 586 June 1994 1 006 405 June 2000 06001960 January 1994 06240213 August 1994 09113724 May 1997 10158614 June 1998 |
| Primary Examiner: | Hess, Bruce H. |
| رقم الانضمام: | edspgr.07297658 |
| قاعدة البيانات: | USPTO Patent Grants |
| الوصف غير متاح. |