Patent US4613547A successfully refreshed from Google Patents.
US4613547A
Expired / Lapsed
US
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Multi-layer oriented polypropylene films
Assignee: Mobil Oil AS
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Filing: 1984-12-19
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Granted: 1986-09-23
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Expires: 2004-12-19
Abstract
Abstract An oriented film structure comprising a polypropylene film having on at least one surface thereof a layer of a blend of (I) a linear low density copolymer of ethylene with a minor proportion of a C3-C10 alpha olefin and (II) polypropylene.
Inventors
- 👤 John R. Wagner, Jr.
- 👤 Melvil B. Clauson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:48
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B2307/00; B32B2307/30; B32B2307/31; B32B2307/70; B32B2307/746; B32B2553/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
58 words
An oriented film structure comprising a polypropylene film having on at least one surface thereof a layer of a blend of (I) a linear low density copolymer of ethylene with a minor proportion of a C 3 -C 10 alpha olefin and (II) polypropylene wherein said blend layer has a lower coefficient of friction than said polypropylene film.
Claim 2
Dependent Claim
58 words
An oriented film structure comprising a polypropylene film having on at least one surface thereof a layer of a blend of (I) a linear low density copolymer of ethylene with a minor proportion of a C 3 -C 10 alpha olefin and (II) polypropylene wherein said blend layer has a lower coefficient of friction than said polypropylene film.
Claim 3
Dependent Claim
17 words
The structure of claim 1 wherein said blend contains from about 2-90 wt. % of said copolymer.
Claim 4
Dependent Claim
17 words
The structure of claim 2 wherein said blend contains from about 4-70 wt. % of said copolymer.
Claim 5
Dependent Claim
21 words
The structure of claim 2 wherein said minor proportion of alpha olefin constitutes from about 2-8 wt. % of said copolymer.
Claim 6
Dependent Claim
18 words
The structure of claim 3 wherein said minor proportion constitutes from about 2.5-5 wt. % of said copolymer.
Claim 7
Dependent Claim
16 words
The structure of claim 1 wherein said layer is on one surface of said polypropylene film.
Claim 8
Dependent Claim
16 words
The structure of claim 1 wherein said layer is on both surfaces of said polypropylene film.
Claim 9
Independent Claim
63 words
A method for making an oriented film structure comprising: applying to at least one surface of a polypropylene film a layer of a blend of (I) a linear low density copolymer of ethylene with a minor proportion of a C 3 -C 10 alpha olefin and (II) polypropylene, bringing the combination to a stretch-orientable condition and stretching it in at least one direction.
Claim 10
Independent Claim
63 words
A method for making an oriented film structure comprising: applying to at least one surface of a polypropylene film a layer of a blend of (I) a linear low density copolymer of ethylene with a minor proportion of a C 3 -C 10 alpha olefin and (II) polypropylene, bringing the combination to a stretch-orientable condition and stretching it in at least one direction.
Claim 11
Dependent Claim
27 words
The method of claim 8 wherein the blend layer is applied to the polypropylene film during coextrusion through a die followed by cooling prior to biaxial orientation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |