Films using blends of polypropylene and polyisobutylene
First Claim
1. A multiple layer sheet material, comprising:
- (a) a first polypropylene-based layer having two opposing surfaces, said first layer being a blend of 35% to 90% by weight polypropylene copolymer and conversely 65% to 10% by weight polyisobutylene, said polypropylene copolymer comprising 70 to 98 mole percent propylene moieties and conversely 30 to 2 mole percent ethylene moieties, the overall composition of said blend comprising at least about 1.8 mole percent ethylene; and
(b) a second layer of a metal foil affixed on one said surface of said first layer.
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Abstract
This invention teaches using blends of polyisobutylene and polypropylene copolymer in the formation of single layer films and multiple layer sheet materials. The films and sheet materials are useful as flexible packaging materials. The multiple layer sheet materials may be entirely polymeric or may include layers having non-polymeric components, such as metal. The blends of polyisobutylene and polypropylene copolymer unexpectedly have the capability of being extruded through a slot die to form a film having a functionally useful mixture of its components. Thus the invention further includes methods of forming film-like layers of the blends of polyisobutylene and polypropylene copolymer.
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Citations
28 Claims
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1. A multiple layer sheet material, comprising:
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(a) a first polypropylene-based layer having two opposing surfaces, said first layer being a blend of 35% to 90% by weight polypropylene copolymer and conversely 65% to 10% by weight polyisobutylene, said polypropylene copolymer comprising 70 to 98 mole percent propylene moieties and conversely 30 to 2 mole percent ethylene moieties, the overall composition of said blend comprising at least about 1.8 mole percent ethylene; and (b) a second layer of a metal foil affixed on one said surface of said first layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification