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US 4,291,092 AGranted
Heat sealable packaging film comprising propylene polymer substrate and a surface layer blend of ethylene copolymer and propylene copolymer
AssigneeMobil Oil Corporation
InventorMilton L. Weiner
Life of this patent
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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.
Claims9
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).
1 more element
Dependencies are inferred from the claim text.