US5064579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing an oriented silicone resin coated polymeric film
Assignee: Akzo Nobel Films Holding Ltd
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Filing: 1990-05-29
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Granted: 1991-11-12
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Expires: 2010-05-29
Abstract
Abstract This invention concerns the production of oriented polymeric films in which a layer of an ambient temperature curable silicone resin composition is formed on a layer of a polymeric film which is thereafter stretched at an elevated temperature to effect orientation of the film. The silicone resin composition includes a volatile inhibitor for inhibiting curing of the composition while stretching is effected. Suitable inhibitors include alkanols when the silicone resin has hydroxyl functionality. Films so produced can be used as release films.
Inventors
- 👤 Kenneth D. Kendall
- 👤 Darren W. Dean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:11
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/052; C08J2483/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
89 words
A process for the production of an oriented polymeric film which process comprises forming a layer of an ambient temperature curable silicone resin composition on a surface of a polymeric film, stretching the film at an elevated temperature to effect orientation of the film and winding the stretched film into a roll, wherein the silicone resin composition includes a volatile inhibitor for inhibiting curing of the composition while stretching is effected such that the majority of curing of the composition occurs after the film is wound into a roll.
Claim 2
Dependent Claim
89 words
A process for the production of an oriented polymeric film which process comprises forming a layer of an ambient temperature curable silicone resin composition on a surface of a polymeric film, stretching the film at an elevated temperature to effect orientation of the film and winding the stretched film into a roll, wherein the silicone resin composition includes a volatile inhibitor for inhibiting curing of the composition while stretching is effected such that the majority of curing of the composition occurs after the film is wound into a roll.
Claim 3
Dependent Claim
30 words
A process according to claim 1, wherein the volatile inhibitor is present in the composition in an amount sufficient to inhibit curing thereof until the said stretching is substantially complete.
Claim 4
Dependent Claim
13 words
A process according to claim 1, wherein the volatile inhibitor comprises an alkanol.
Claim 5
Dependent Claim
14 words
A process according to claim 3, wherein the volatile alkanol is ethanol or propan-2-ol.
Claim 6
Dependent Claim
21 words
A process according to claim 3, wherein the silicone resin composition includes an organometallic catalyst for catalyzing curing of the composition.
Claim 7
Dependent Claim
13 words
A process according to claim 5, wherein the catalyst is a tin-containing compound.
Claim 8
Dependent Claim
23 words
A process according to claim 1, wherein the silicone of the composition comprises a dialkyl or alkyl aryl silicone fluid having hydroxyl functionality.
Claim 9
Dependent Claim
17 words
A process according to claim 7, wherein the composition contains a tetra-silicate ester as a cross-linking agent.
Claim 10
Dependent Claim
33 words
A process according to claim 1, wherein the film is stretched to effect orientation in one direction before the silicone resin composition is applied and the film is thereafter oriented in another direction.
Claim 11
Dependent Claim
22 words
A process according to claim 1, wherein the film is subjected to a corona discharge treatment before the curable composition is applied.
Claim 12
Dependent Claim
25 words
A process according to claim 1, wherein the film is heat set after the composition has been applied and the film has thereafter been oriented.
Claim 13
Dependent Claim
13 words
A process according to claim 1, wherein the film is a polypropylene film.
Claim 14
Dependent Claim
15 words
A process according to claim 1, wherein the polymeric film comprises two or more layers.
Claim 15
Dependent Claim
15 words
A process according to claim 1, wherein the polymeric film after stretching has voids therein.
Claim 16
Dependent Claim
19 words
A process according to claim 1, wherein the film is stretched by at least 4.5:1 in the machine direction.
Claim 17
Dependent Claim
19 words
A process according to claim 1, wherein the film produced has a thickness of from 20 to 100 microns.
Claim 18
Dependent Claim
18 words
A process according to claim 15, wherein the film is stretched 5.5 to 6.5:1 in the machine direction.
Claim 19
Dependent Claim
19 words
A process according to claim 16, wherein the film produced has a thickness of from 40 to 60 microns.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-11 | 1995-05-13 | 1995-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-11 | 1999-05-13 | 1999-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-11 | 2003-05-13 | 2003-11-12 | $7700.00 | Window Closed / Lapsed |