Highly oriented multilayer film
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United States of America Patent
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Jan 9, 1996
Issued Date -
N/A
app pub date -
Mar 22, 1994
filing date -
Nov 3, 1992
priority date (Note) -
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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.
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