Biaxially oriented multilayer barrier films

Details Biaxially oriented multilayer barrier films Biaxially oriented multilayer barrier films

1987-10-05

1989-11-14

Ives, P. C.

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

428349, 428520, 428910, 264171, 426127, B32B 2708, B29F 306

Patent

active

048807060

ABSTRACT:
Films having a core of ethylene-vinyl alcohol copolymer (EVOH) sandwiched between polyolefin, e.g. polypropylene are coextruded so that the polyolefin also encapsulates the EVOH layer on the side edges. The films which can contain adhesive layers are oriented greater than 4 greater in the machines direction and greater than 7 greater in the transverse direction to give excellent oxygen and moisture barrier properties.

REFERENCES:
patent: 3448183 (1969-06-01), Chisholm
patent: 3555604 (1971-01-01), Pahlke
patent: 3882259 (1975-05-01), Nohara et al.
patent: 4152387 (1979-05-01), Cloeren
patent: 4533510 (1985-08-01), Nissel
patent: 4561920 (1985-12-01), Foster
patent: 4650721 (1987-03-01), Ashcraft et al.
patent: 4713296 (1987-12-01), Aoyama et al.
3,398,431, Corbett Filed 10/23/64 (OG except only).

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