Heat sealable, biaxally oriented polypropylene film with improved barrier properties
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United States of America Patent
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Aug 17, 2004
Grant Date -
N/A
app pub date -
Sep 5, 2000
filing date -
Feb 12, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a multi-layer, sealable biaxially oriented polypropylene film consisting of a base layer and at least one sealable covering layer. The base layer contains between 1 and 15 weight % of a resin with a mean molecular weight Mw of between 600 and 1,500 and between 1 and 6 weight % of a wax with a mean molecular weight Mn of between 200 and 700. The n-heptane insoluble part of the polypropylene of the base layer has a chain isotactic index of at least 95%, as measured by .sup.13 C-NMR spectroscopy. The invention also relates to a method for producing said film and to its use.
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