Claims
- 1. A printable, coated, biaxially oriented film, comprising:
(a) a base film having a first and a second side, said base film comprising polypropylene; and (b) a urethane coating on said first side, said coating having been applied to said base film between a machine direction orientation and a transverse direction orientation of a two step tentering operation.
- 2. The film of claim 1, wherein the base film additionally comprises a base film antiblock agent.
- 3. The film of claim 2, wherein the base film antiblock agent is present at up to 1% by weight of the film.
- 4. The film of claim 2, wherein the base film antiblock agent is present at up to 0.5% by weight of the film.
- 5. The film of claim 2, wherein the base film antiblock agent is an antiblock agent selected from the group consisting of silica-based, silicone-based, and a blend of silica-based and silicone-based antiblock agents.
- 6. The film of claim 1, wherein the urethane coating comprises a waterborne urethane dispersion.
- 7. The film of claim 1, wherein the urethane coating comprises a waterborne urethane dispersion blended with waterborne acrylic dispersions.
- 8. The film of claim 1, wherein the urethane coating comprises a crosslinking agent.
- 9. The film of claim 8, wherein the crosslinking agent is present in the coating at up to 1% by dry weight.
- 10. The film of claim 8, wherein the crosslinking agent is polyfunctional aziridine crosslinking agent at up to 1% by dry weight of the coating.
- 11. The film of claim 1, wherein the urethane coating comprises a coating antiblock agent.
- 12. The film of claim 11, wherein the urethane coating comprises up to 1% coating antiblock agent based on dry component weight of the coating.
- 13. The film of claim 11, wherein the base film antiblock agent is an antiblock agent selected from the group consisting of silica-based, silicone-based, and a blend of silica-based and silicone-based antiblock agents.
- 14. The film of claim 1, including a surface treatment on the first side beneath the urethane coating.
- 15. The film of claim 14, wherein the surface treatment on the first side comprises an oxidative treatment.
- 16. The film of claim 1, including a surface treatment on the second side.
- 17. The film of claim 16, wherein the surface treatment on the second side comprises an oxidative treatment.
- 18. The film of claim 1, wherein the polypropylene is a polypropylene homopolymer.
- 19. The film of claim 1, wherein the polypropylene is a copolymer of propylene.
- 20. The film of claim 1, wherein the polypropylene is a blend of homopolymers and copolymers.
- 21. The film of claim 1, wherein the base film is a coextruded structure.
- 22. The film of claim 21, wherein the coextruded structure has at least three layers.
- 23. The film of claim 21, wherein the coextruded structure includes a core and at least one skin layer.
- 24. The film of claim 1, wherein the base film is an extruded film that has an additional layer added by extrusion coating.
- 25. A method for manufacturing a printable polypropylene film comprising the steps of:
(a) forming a base film comprising a substantially uniform film layer comprising polypropylene; (b) uniaxially orienting the base film by machine direction stretching of the base film; (c) applying a coating of urethane to a first side of the uniaxially oriented base film; and (d) biaxially orienting the coated film by stretching the film transversely to the machine direction.
- 26. The method of claim 25, wherein the step of forming the base film comprises forming the base film comprising a base film antiblock agent.
- 27. The method of claim 25, wherein the step of forming the base film includes a step of forming the base film having a base film antiblock agent present at up to 1% by weight of the coating.
- 28. The method of claim 25, wherein the step of forming the base film includes a step of forming the base film having a base film antiblock agent present at up to 0.5% by weight of the coating.
- 29. The method of claim 26, wherein the base film antiblock agent is an antiblock agent selected from the group consisting of silica-based, silicone-based, and a blend of silica-based and silicone-based antiblock agents.
- 30. The method of claim 25, wherein the step of applying a coating comprises a step of applying a waterborne urethane dispersion.
- 31. The method of claim 25, wherein the step of applying a coating comprises a step of applying a waterborne urethane dispersion blended with waterborne acrylic dispersions.
- 32. The method of claim 25, wherein the step of applying a coating of urethane comprises a step of applying a coating of urethane having a coating crosslinking agent.
- 33. The method of claim 25, wherein the step of applying a coating of urethane comprises a step of applying a coating having a coating crosslinking agent present at up to 1% by weight of the coating.
- 34. The method of claim 25, wherein the step of applying a coating of urethane comprises a step of applying a coating of urethane having a polyfunctional aziridine crosslinking agent at approximately 1% by dry weight of the coating.
- 35. The method of claim 25, wherein the step of applying a coating comprises applying a urethane coating comprising a coating antiblock agent.
- 36. The method of claim 25, wherein the step of applying a coating comprises applying a urethane coating comprising up to 1% antiblock agent based on dry component weight.
- 37. The method of claim 25, wherein the base film antiblock agent is an antiblock agent selected from the group consisting of silica-based, silicone-based, and a blend of silica-based and silicone-based antiblock agents.
- 38. The method of claim 25, including a step of surface treating the first side prior to the step of applying the coating of urethane.
- 39. The method of claim 38, wherein the step of surface treating the first side includes oxidatively treating.
- 40. The method of claim 25, including the step of surface treating the second side.
- 41. The method of claim 40, wherein the step of surface treating the second side comprises oxidative treating.
- 42. The method of claim 25, wherein the step of forming the film base film comprising a substantially uniform film layer comprising polypropylene includes forming the base film comprising polypropylene homopolymer.
- 43. The method of claim 25, wherein the step of forming the base film comprising a substantially uniform film layer comprising polypropylene includes forming the base film comprising propylene copolymer.
- 44. The method of claim 25, wherein the step of forming the base film comprising a substantially uniform film layer comprising polypropylene includes forming the base film comprising a blend of homopolymers and copolymers.
- 45. The method of claim 25, wherein the step of forming the base film includes coextruding a base film.
- 46. The method of claim 25, wherein the step of forming the base film includes coextruding a three layer base film.
- 47. The method of claim 25, wherein the step of forming the base film includes coextruding a base film having a core and at least one skin layer.
- 48. The method of claim 25, wherein the step of forming the base film includes forming an extruded film that has an additional layer added by extrusion coating.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority to U.S. Provisional Application Serial No. 60/457,473, entitled Urethane Based Coating Applied In-Line for Improved Ink Adhesion, filed Mar. 25, 2003, now pending.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60457473 |
Mar 2003 |
US |