US4291092A
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: 1979-10-05
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Granted: 1981-09-22
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Expires: 1999-10-05
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 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
2026-10-25 15:13
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/32; B32B2270/00; 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: 10
Claim 1
Independent Claim
124 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 of copolymer containing up to 40% by weight of a different compatible polyolefin; and (b) on at least one of the surfaces of the substrate layer, a surface layer comprising a blend of less than 25 weight percent or greater than 90 weight percent of a copolymer of ethylene (1-9.5 mole percent) and a higher olefin having 4 or more carbon atoms (99-90.5 mole percent), and greater than 75 weight percent or less than 10 weight percent of a copolymer of propylene (80-95 mole percent) and a higher olefin having 4 or more carbon atoms (20-5 mole percent).
Claim 2
Dependent Claim
124 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 of copolymer containing up to 40% by weight of a different compatible polyolefin; and (b) on at least one of the surfaces of the substrate layer, a surface layer comprising a blend of less than 25 weight percent or greater than 90 weight percent of a copolymer of ethylene (1-9.5 mole percent) and a higher olefin having 4 or more carbon atoms (99-90.5 mole percent), and greater than 75 weight percent or less than 10 weight percent of a copolymer of propylene (80-95 mole percent) and a higher olefin having 4 or more carbon atoms (20-5 mole percent).
Claim 3
Dependent Claim
14 words
The multiple-layer, heat-sealable film of claim 1 in which the substrate is polypropylene homopolyer.
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 copolymer comprising propylene and up to 20 mole percent of a higher alpha-olefin.
Claim 6
Dependent Claim
33 words
The multiple-layer, heat-sealable film of claim 1 in which the substrate is a mixture of polypropylene homopolymer or polypropylene copolymer, and the said blend (1); and the surface layer comprises the said blend.
Claim 7
Dependent Claim
20 words
The multiple-layer, heat-sealable film of claim 1 in which both surfaces of the substrate have a layer comprising said blend.
Claim 8
Dependent Claim
21 words
The multiple-layer, heat-sealable film of claim 1 in which only one surface of the substrate has a layer comprising said blend.
Claim 9
Dependent Claim
36 words
The multiple-layer, heat-sealable film of claim 1 in which only one surface of the substrate has a layer comprising said blend; and the substrate is a mixture of polypropylene homopolymer or polypropylene copolymer, and said blend.
Claim 10
Dependent Claim
72 words
The multiple-layer, heat sealable film of claim 1, in which the surface layer comprises a blend of greater than 90 weight percent of a copolymer of ethylene (1-9.5 mole percent) and a higher olefin having 4 or more carbon atoms (99 to 90.5 mole percent), and less than 10 weight percent of a copolymer of propylene (80-95 mole percent) and a higher olefin having 4 or more carbon atoms (20-5 mole percent).
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) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |