Multiple-layer films
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United States of America Patent
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-
Feb 24, 1981
Issued Date -
N/A
app pub date -
Jan 31, 1979
filing date -
Mar 29, 1974
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multiple-layer film having a substrate layer of high density polyethylene or a propylene homo- or co-polymer, and, on at least one surface of the substrate, a heat-sealable layer of a propylene co-polymer containing from 80 to 95% of propylene, the balance being a C.sub.4 to C.sub.10 olefin. The substrate and surface layers exhibit a monoclinic crystalline structure.
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