US4340641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat sealable packaging film comprising propylene polymer substrate and a surface layer blend of ethylene copolymer and propylene copolymer
Assignee: Mobil Oil AS
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Filing: 1980-11-03
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Granted: 1982-07-20
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Expires: 2000-11-03
Abstract
Abstract Multiple layer, heat sealable films are described comprising a substrate layer of polypropylene homopolymers or copolymers, or blends thereof with compatible polyolefins, and at least one heat sealable surface layer of a blend of a copolymer of ethylene and a higher olefin, and a copolymer of 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
2026-10-24 11:32
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; 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
132 words
A multiple-layer, heat-sealable film comprising; (a) a substrate layer consisting essentially of a homopolymer of polypropylene or a copolymer of polypropylene which is blended with up to 40 weight % of a different compatible polyolefin; and (b) on one of the surfaces of the substrate layer, a surface layer comprising a blend of 5-95 wt. % of a copolymer of ethylene (1-9.5 mole %) and a higher olefin having 4 or more carbon atoms (99-90.5 mole %), and a 95-5 wt. % copolymer of propylene (less than 80 mole % or greater than 95 mole %) and a higher olefin having 4 or more carbon atoms (greater than 20 mole % or less than 5 mole %); in which said different compatible polyolefin in the substrate corresponds to said surface layer blend.
Claim 2
Dependent Claim
132 words
A multiple-layer, heat-sealable film comprising; (a) a substrate layer consisting essentially of a homopolymer of polypropylene or a copolymer of polypropylene which is blended with up to 40 weight % of a different compatible polyolefin; and (b) on one of the surfaces of the substrate layer, a surface layer comprising a blend of 5-95 wt. % of a copolymer of ethylene (1-9.5 mole %) and a higher olefin having 4 or more carbon atoms (99-90.5 mole %), and a 95-5 wt. % copolymer of propylene (less than 80 mole % or greater than 95 mole %) and a higher olefin having 4 or more carbon atoms (greater than 20 mole % or less than 5 mole %); in which said different compatible polyolefin in the substrate corresponds to said surface layer blend.
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 blend.
Claim 4
Dependent Claim
34 words
The multiple-layer, heat-sealable film of claim 1 in which the substrate is polypropylene copolymer comprising propylene and up to 10 mole percent of ethylene blended with 1-40% by weight of the surface layer blend.
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 percent of a higher alpha-olefin blended with 1-40% by weight of the surface layer blend.
References Cited (Backward Citations)
US4205021A
Cited
US4297411A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-19 | 1986-01-18 | 1986-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-19 | 1990-01-18 | 1990-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-19 | 1994-01-18 | 1994-07-20 | $7700.00 | Window Closed / Lapsed |