US4297411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat sealable packaging film comprising propylene polymer substrate and a surface layer of an ethylene copolymer and a different olefin copolymer
Assignee: Mobil Oil AS
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Filing: 1979-10-05
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Granted: 1981-10-27
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Expires: 1999-10-05
Abstract
Abstract Multiple-layer, heat-sealable films comprising a substrate layer of polypropylene homopolymer or polypropylene copolymer, or blends thereof with compatible polyolefins; and at least one heat-sealable surface layer of a blend comprising a copolymer of ethylene and a higher olefin, and a different copolymer of higher olefins. 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 22:23
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; B32B2323/00; B32B2323/10; B32B2553/00; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/2848; Y10T428/2852; Y10T428/2878; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/31924
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
121 words
A multiple-layer, heat-sealable film comprising (a) a substrate layer consisting essentially of a homopolymer of polypropylene, a copolymer of polypropylene, or a blend of said homopolymer or copolymer containing up to 40% by weight of a different compatible polyolefin or polyolefin blend; and (b) on at least one of the surfaces of the substrate layer, a surface layer comprising a blend of 5-95 weight percent of a copolymer of ethylene (10-75 mole percent) and a higher olefin having 4 or more carbon atoms (90-25 mole percent), and 95-5 weight percent of a different copolymer of an alpha olefin having 2 or more carbon atoms (2-98 mole percent) and a different higher olefin having 3 or more carbon atoms (98-2 mole percent);
Claim 2
Dependent Claim
121 words
A multiple-layer, heat-sealable film comprising (a) a substrate layer consisting essentially of a homopolymer of polypropylene, a copolymer of polypropylene, or a blend of said homopolymer or copolymer containing up to 40% by weight of a different compatible polyolefin or polyolefin blend; and (b) on at least one of the surfaces of the substrate layer, a surface layer comprising a blend of 5-95 weight percent of a copolymer of ethylene (10-75 mole percent) and a higher olefin having 4 or more carbon atoms (90-25 mole percent), and 95-5 weight percent of a different copolymer of an alpha olefin having 2 or more carbon atoms (2-98 mole percent) and a different higher olefin having 3 or more carbon atoms (98-2 mole percent);
Claim 3
Dependent Claim
14 words
The multiple-layer, heat-sealable film of claim 1 in which the substrate is polypropylene homopolymer.
Claim 4
Dependent Claim
24 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.
Claim 5
Dependent Claim
29 words
The multiple-layer, heat-sealable film of claim 1 in which the substrate is a mixture of polypropylene homopolymer comprising propylene and up to 20 mole percent of a higher alpha-olefin.
Claim 6
Dependent Claim
25 words
The multiple-layer, heat-sealable film of claim 1 in which the substrate is a mixture of polypropylene homopolymer or polypropylene copolymer, and said surface layer blend.
Claim 7
Dependent Claim
22 words
The multiple-layer, heat-sealable film of claim 1 in which both surfaces of the substrate have a layer comprising said surface layer blend.
Claim 8
Dependent Claim
23 words
The multiple-layer, heat-sealable film of claim 1 in which only one surface of the substrate has a layer comprising said surface layer blend.
Claim 9
Dependent Claim
40 words
The multiple-layer, heat-sealable film of claim 1 in which only one surface of the substrate has a layer comprising said surface layer blend; and the substrate is a mixture of polypropylene homopolymer or polypropylene copolymer, and said surface layer blend.
Claim 10
Dependent Claim
29 words
The multiple-layer, heat-sealable film of claim 1 in which said different copolymer in the surface layer is a copolymer of ethylene (2-98 mole percent) and propylene (98-2 mole percent).
References Cited (Backward Citations)
US4186240A
Cited
US4125662A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |