Films using blends of polypropylene and polyisobutylene

Details Films using blends of polypropylene and polyisobutylene Films using blends of polypropylene and polyisobutylene

1988-06-13

1991-04-09

Buffalow, Edith

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

4284763, 428522, 525240, B29D 2200

Patent

active

050063847

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 nonpolymeric 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.

REFERENCES:
patent: 4568580 (1986-02-01), Ghirardello et al.
patent: 4588648 (1986-05-01), Krueger et al.
patent: 4717618 (1988-01-01), Tse et al.
patent: 4724185 (1988-02-01), Shah
patent: 4764404 (1988-08-01), Genske et al.
patent: 4769261 (1988-09-01), Hazelton et al.
patent: 4818592 (1989-04-01), Ossian

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