Composite films free from metal layers
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United States of America Patent
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-
Sep 8, 1992
Grant Date -
N/A
app pub date -
Mar 19, 1990
filing date -
Mar 29, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The composite film contains individual layers of polyvinyl alcohol, a polyolefin, an ethylene/vinyl alcohol and a polyolefin in that order and is comparable in its barrier properties to water vapor and gas with composite films containing metal layers without having any of their disadvantages.
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