Highly oriented multilayer film

Details Highly oriented multilayer film Highly oriented multilayer film

1994-03-22

1996-01-09

Buffalow, Edith

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428 367, 4284744, 428483, 428500, 428516, 428520, B32B 516

Patent

active

054827701

ABSTRACT:
An oriented multilayer film comprises a barrier layer of polymerized ethylene vinyl alcohol, and an orientation-compatible polymeric layer having a modulus of at least about 4.times.10.sup.4 psi. The a barrier layer occupies from about 2 to 15 volume percent of the oriented multilayer film, and has a thickness of from about 0.01 to 0.75 mils. The polymerized ethylene vinyl alcohol has an ethylene content of from about 38 to 48 weight percent. The orientation compatible layer has a thickness of from about 0.49 to 4.5 mils. The multilayer film is oriented at a temperature of from about 165.degree. F. to 212.degree. F., has an orientation ratio greater than 9, an oxygen permeability at 0% relative humidity of from about 1 and 6 cm.sup.3 -mil/day-m.sup.2 -atm, and a total thickness of from about 0.5 to 5 mils.

REFERENCES:
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patent: 4501798 (1985-02-01), Koschak et al.
patent: 4640852 (1987-03-01), Ossian
patent: 4650721 (1987-03-01), Ashcraft et al.
patent: 4684573 (1987-08-01), Mueller et al.
patent: 5004647 (1991-04-01), Shah

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