Claims
- 1. A release film having a maximum release force value of 39 g/cm (0.22 lbs/inch) at a film thickness of 0.10 to 0.15 mm in an adhesive peel test, the release film comprising a linear ethylenic polymer having a density from 0.865 g/cc to 0.900 g/cc and an index of polydispersity of less than 5.0, wherein the release film is substantially free of silicone.
- 2. The release film of claim 1, wherein the linear ethylenic polymer is a copolymer of ethylene and at least one comonomer selected from the group consisting of propylene, butene, pentene, hexene, methylpentene and octene, and combinations thereof.
- 3. The release film of claim 1, wherein the linear ethylenic polymer has an index of polydispersity of less than 3.0.
- 4. The release film of claim 3, wherein the linear ethylenic polymer has an index of polydispersity of less than 2.5.
- 5. The release film of claim 1, wherein the release film is 0.01 to 0.5 mm (0.5 to 20 mils) in thickness.
- 6. The release film of claim 1, further comprising at least two layers of polymeric film laminated with the release film to provide a multi-layer construction having an odd number of layers of polymeric film and having two release surfaces, each surface having a maximum release force value of 39 g/cm (0.22 lbs/inch) at a film thickness of 0.10 to 0.15 mm in an adhesive peel test.
- 7. The release film of claim 6, wherein the multi-layer construction comprises a core layer of at least one polymeric film having a tensile modulus at 5% elongation of at least 8.27 MPa (1,200 psi) for mechanical support.
- 8. The release film of claim 7, wherein the core layer is selected from the group of films consisting of polyethylene polymers and copolymers having a density greater than 0.940 g/cc, polyamide, polypropylene, polymethylpentene and polyester and combinations thereof.
- 9. The release film of claim 6, wherein the two release surfaces have different maximum release force values.
- 10. The release film of claim 1, wherein the release film is 0.05 to 0.15 mm (2 to 6 mils) in thickness.
- 11. The release film of claim 1, wherein the linear ethylenic polymer has been polymerized using a metallocene catalyst.
Parent Case Info
This is a divisional of application Ser. No. 08/623,208 filed on Mar. 28, 1996 U.S. Pat. No. 5,817,386.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
5817386 |
Adamko et al. |
Oct 1998 |
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Foreign Referenced Citations (1)
Number |
Date |
Country |
9500333 |
Jan 1995 |
WOX |
Divisions (1)
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Number |
Date |
Country |
Parent |
623208 |
Mar 1996 |
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