Films using blends of polypropylene and polyisobutylene
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United States of America Patent
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May 5, 1992
Issued Date -
N/A
app pub date -
Apr 8, 1991
filing date -
Nov 29, 1985
priority date (Note) -
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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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