Multi-layer barrier film

Details Multi-layer barrier film Multi-layer barrier film

1978-12-28

1980-12-16

Kendell, Lorraine T.

Stock material or miscellaneous articles

Hollow or container type article

Cellular material derived from plant or animal source

428411, 428500, 428516, 428518, 428520, 428522, 4284758, B32B 904, B32B 2708

Patent

active

042398266

ABSTRACT:
A delamination resistant multi-layer film comprises a core layer of vinyl alcohol polymers or copolymers such as polyvinyl alcohol or ethylene vinyl alcohol. Adhered to the core layer are one or more layers of a partially hydrolyzed vinyl acetate polymer or copolymer having functional groups in the polymer such that strong adhesion to the core layer is obtained. The core layer provides an excellent oxygen barrier, while the adjacent layers protect the core layer from degradation by exposure to water vapor. Additional layers of various polymer materials may be provided over the layers of partially hydrolyzed vinyl acetate. The film can be prepared by coextrusion techniques.

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