Patent US4839123A successfully refreshed from Google Patents.
US4839123A
Expired / Lapsed
US
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Process of applying a silicone release coating to an oriented polymer film
Assignee: Mobil Oil AS
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Filing: 1986-08-18
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Granted: 1989-06-13
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Expires: 2006-08-18
Abstract
Abstract A process is disclosed for making an oriented polymer film product which comprises: (a) applying a solventless, curable silicone release composition to an extrudable, orientable polymer; (b) extruding the polymer as a sheet or film; (c) orienting the sheet or film such that curable silicone release composition migrates to at least one surface of the sheet or film forming a substantially continuous layer thereon; and (d) subjecting the oriented sheet or film to silicone-curing conditions whereby said curable silicone release composition forms a substantially continuous release layer thereon.
Inventors
- 👤 Gary L. Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:47
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/56; B29C33/60; B29C33/62; B29C33/64; B29C48/00; B29C48/022; B29C48/03; B29C48/07; B29C48/08; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/305; B29C48/307; B29C55/00; B29C55/02; B29C55/023; B29C55/026; B29C35/00; B29K; B29K2995/00; B29K2995/0018; B29K2995/0025; B29L; B29L2009/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
85 words
A process for making an oriented polymer film product which comprises: (a) incorporating a solventless, curable silicone release composition into an extrudable, orientable polymer; (b) extruding the polymer as a sheet or film; (c) orienting the sheet or film such that curable silicone release composition migrates to at least one surface of the sheet or film forming a substantially continuous layer thereon; and, (d) subjecting the oriented sheet or film to silicone-curing conditions whereby said curable silicone release composition forms a peelable release layer thereon.
Claim 2
Dependent Claim
85 words
A process for making an oriented polymer film product which comprises: (a) incorporating a solventless, curable silicone release composition into an extrudable, orientable polymer; (b) extruding the polymer as a sheet or film; (c) orienting the sheet or film such that curable silicone release composition migrates to at least one surface of the sheet or film forming a substantially continuous layer thereon; and, (d) subjecting the oriented sheet or film to silicone-curing conditions whereby said curable silicone release composition forms a peelable release layer thereon.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein in step (c), the film is biaxially oriented in the machine and transverse directions.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the film is fabricated from a highly stereoregular polypropylene homopolymer.
Claim 5
Dependent Claim
33 words
The process of claim 1 wherein the film possesses a barrier layer applied to one surface thereof, said barrier layer preventing or blocking the exudation of curable silicone release composition upon said surface.
Claim 6
Dependent Claim
34 words
The process of claim 3 wherein the film possesses a relatively thin layer of polymer of comparatively low stereoregularity applied to one surface thereof, the curable silicone release composition preferentially migrating to said surface.
Claim 7
Dependent Claim
35 words
The process of claim 5 wherein the film possesses a barrier layer applied to the opposite surface thereof, said barrier layer preventing or blocking the exudation of curable silicone release composition upon said opposite sureface.
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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) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |