Claims
- 1. A release film, comprising:a base polymer film; a release coating on said base polymer film, wherein said coating includes a cross-linked acrylic and a polyolefin wax, with a ratio of said polyolefin wax to said cross-linked acrylic of about 1:1 to about 30:1.
- 2. The release film of claim 1, having a dry coating thickness of about 0.0004 to about 0.06 microns.
- 3. The release film of claim 1, wherein said coating has a coefficient of friction of about 0.15 to about 0.4.
- 4. The release film of claim 1, wherein said coating has a coefficient of friction of about 0.2 to about 0.35.
- 5. The release film of claim 1, wherein said coating has a release force of less than about 100 grams per inch.
- 6. The release film of claim 1, wherein said coating has a release force of less than about 80 grams per inch.
- 7. The release film of claims 1, wherein said coating has a release force of about 20 to about 60 grams per inch.
- 8. The release film of claim 1, wherein said base polymer film has said coating on a first face and a cold seal adhesive on a second face.
- 9. The release film of claim 8, wherein said cold seal adhesive includes a natural or synthetic latex rubber compound.
- 10. The release film of claim 1, wherein said base polymer film includes polyester.
- 11. The release film of claim 1, wherein said base polymer film is polyester.
- 12. The release film of claim 1, wherein said release film has a haze of less than about 5%.
- 13. The release film of claim 1, wherein said base polymer film is not polypropylene.
- 14. The release film of claim 1, wherein said coating has a surface energy level of about 20 to about 40 dynes/cm.
- 15. A method of forming a release film, comprising:positioning a base polymer film; applying a release coating to said base polymer film, wherein said coating comprises a cross-linkable acrylic and a polyolefin wax, and has a ratio of said polyolefin wax to said cross-linkable acrylic of about 1:1 to about 30:1; and cross-linking said cross-linkable acrylic.
- 16. The method of claim 15, wherein the cross-linking step is performed by heat setting said release polymer film after said coating step at temperatures of about 190 to about 240 degrees Celsius.
- 17. The method of claim 15, wherein said base polymer film is corona treated prior to said coating step.
- 18. The method of claim 15, wherein said coating is applied by in-line coating.
- 19. The method of claim 15, further comprising the step of contacting a ceramic coating to at least a portion of said release film.
- 20. The method of claim 15, further comprising the step of contacting a cold seal adhesive to at least a portion of said release film.
- 21. The method of claim 15, wherein said release film is a thermal lamination film.
- 22. The method of claim 15, wherein said release film is a photoresist cover sheet.
- 23. The method of claim 15, wherein said release film is a flexographic printing plate cover sheet.
- 24. The method of claim 15, wherein said release film is a ceramic capacitor release sheet.
- 25. A method of forming a release film, comprising:positioning a base polymer film; applying a release coating to said base polymer film, wherein said coating comprise a cross-linkable acrylic and a polyolefin wax, and has a ratio of said polyolefin wax to said cross-linkable of about 25:1 to about 60:1 and cross-linking said cross-linkable acrylic.
- 26. The method of claim 15, wherein said release film is a protective sheet for a plastic or metal object.
- 27. The method of claim 15, wherein said release coating comprises:water; about 0.05 to about 5 weight percent of said cross-linkable acrylic and about 0.05 to about 15 weight percent of said polyolefin wax.
- 28. The method of claim 15, wherein said release coating is a water-based coating.
- 29. The release film of claim 1, wherein at least one of said cross-linked acrylic and said polyolefin wax are water dispersible.
- 30. The release film of claim 1, wherein said coating provides a release surface having a release force of less than about 100 grams per inch.
- 31. The release film of claim 1, wherein said polyolefin wax is selected from the group consisting of polypropylene, polyethylene, polytetrafluoroethylene and combinations thereof.
- 32. The release film of claim 31, wherein said polyolefin wax is polypropylene.
- 33. The release film of claim 31, wherein said polyolefin wax is polyethylene.
- 34. The release film of claim 31, wherein said polyolefin wax is polytetrafluoroethylene.
- 35. The release film of claim 31, wherein said polyolefin wax includes an oxidized homopolymer of ethylene.
- 36. The method of claim 15, wherein said polyolefin wax is present at about 1 to about 4 weight percent.
- 37. The method of claim 15, wherein said polyolefin wax is present at about 2 to about 3 weight percent.
- 38. The release film of claim 1, wherein said cross-linked acrylic is selected from the group consisting of methylmethacrylates, ethyl acrylates, N-methylol acrylamides, methacrylamides, melamines, aziridines, and combinations thereof.
- 39. The release film of claim 1, wherein said cross-linked acrylic includes methylmethacrylate, ethyl acrylate and N-methylol acrylamides.
- 40. The method of claim 15, wherein said cross-linkable acrylic is present at about 0.05 to about 0.5 weight percent.
- 41. The method of claim 15, wherein said cross-linkable acrylic is present at about 0.2 to about 0.3 weight percent.
- 42. The method of claim 15, wherein said coating has a solids level of about 0.1 to about 7 weight percent.
- 43. The release film of claim 1, wherein said coating is substantially silicone-free.
- 44. The release film of claim 1, wherein said coating further includes one.
- 45. The release film of claim 1, wherein said coating further includes a pendent vinyl polysiloxane.
- 46. The release film of claim 1, wherein said coating further includes a polysiloxane crosslinker.
- 47. The method of claim 15, wherein said coating further includes a silicone, and said silicone is present at up to about 8 percent by weight.
- 48. The method of claim 47, wherein said silicone is present at about 0.5 to about 2 percent by weight.
- 49. The release film of claim 1, having a dry coating thickness of about 0.005 microns to about 0.018 microns.
- 50. The release film of claim 1, wherein said cross-linked acrylic forms nodules on said polymer film.
Parent Case Info
This application claims priority in Provisional Appication Serial No. 60/230,652. filed on Sep. 7, 2000 and U.S. Provisional Application Serial No. 60/249,605 filed on Nov. 17, 2000.
US Referenced Citations (25)
Foreign Referenced Citations (6)
Number |
Date |
Country |
0 527 080 |
Feb 1993 |
EP |
0 789 281 |
Aug 1997 |
EP |
1411564 |
Oct 1975 |
GB |
53 025654 |
Mar 1978 |
JP |
53 031739 |
Mar 1978 |
JP |
05 065461 |
Mar 1993 |
JP |
Non-Patent Literature Citations (1)
Entry |
European Search Report, Examiner: Schmidt, Nov. 21, 2001. |
Provisional Applications (2)
|
Number |
Date |
Country |
|
60/230652 |
Sep 2000 |
US |
|
60/249605 |
Nov 2000 |
US |