US4339498A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat sealable packaging film comprising propylene polymer substrate and a surface layer blend of olefin copolymer or interpolymer
Assignee: Mobil Oil AS
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Filing: 1980-11-03
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Granted: 1982-07-13
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Expires: 2000-11-03
Abstract
Abstract Multiple-layer, heat-sealable films are described comprising a substrate layer of polypropylene homopolymer or copolymer, or blends thereof with compatible polyolefins; and at least one heat-sealable surface layer of an interpolymer of propylene and two different higher alpha-olefins; a copolymer of butene-1 and a higher alpha-olefin or an interpolymer of ethylene, propylene and a higher olefin. The films are prepared by extrusion coating or coextrusion and can be oriented.
Inventors
- 👤 Milton L. Weiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:12
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; C; C09; C09J; C09J7/00; C09J7/20; C09J7/22; C09J7/30; C09J7/35; B32B2270/00; B32B2307/00; B32B2307/30; B32B2307/31; B32B2553/00; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31938
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
94 words
A multiple-layer heat sealable film comprising; (a) a substrate layer consisting essentially of a homopolymer of polypropylene or a copolymer of polypropylene, wherein said homopolymer or copolymer is blended with 1-40% by weight of a different compatible polyolefin; and (b) on 1 of the surfaces of the substrate layer, a surface layer comprising an interpolymer of 2-94 mole % of ethylene, 1-93 mole % of propylene and 5-97 mole % of an alpha-olefin having 4 or more carbon atoms; in which said different compatible polyolefin in the substrate corresponds to the surface layer interpolymer.
Claim 2
Dependent Claim
94 words
A multiple-layer heat sealable film comprising; (a) a substrate layer consisting essentially of a homopolymer of polypropylene or a copolymer of polypropylene, wherein said homopolymer or copolymer is blended with 1-40% by weight of a different compatible polyolefin; and (b) on 1 of the surfaces of the substrate layer, a surface layer comprising an interpolymer of 2-94 mole % of ethylene, 1-93 mole % of propylene and 5-97 mole % of an alpha-olefin having 4 or more carbon atoms; in which said different compatible polyolefin in the substrate corresponds to the surface layer interpolymer.
Claim 3
Dependent Claim
24 words
The multiple-layer heat-sealable film of claim 1 in which the substrate is polypropylene homopolymer blended with 1-40% by weight of the surface layer interpolymer.
Claim 4
Dependent Claim
33 words
The multiple-layer heat-sealable film of claim 1 in which the substrate is polypropylene copolymer comprising propylene and up to 10 mole % of ethylene, blended with 1-40 wt.% of the surface layer interpolymer.
Claim 5
Dependent Claim
36 words
The multiple-layer heat-sealable film of claim 1 in which the substrate is polypropylene copolymer comprising propylene and up to 20 mole % of a higher alpha-olefin, blended with 1-40% by weight of the surface layer interpolymer.
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) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |