Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1988-01-11
1990-01-09
Thurlow, Jeffery
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
264171, 2641761, 264349, 525197, 525198, B29C 4706, B32B 2708, B32B 3130, C08L 2302
Patent
active
048929115
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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American National Can Company
Audet Paul R.
Tentoni Leo B.
Thurlow Jeffery
Wilhelm Thomas D.
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