BIAXIALLY ORIENTED POLYPROPYLENE FILM STRUCTURE HAVING IMPROVED MECHANICAL AND BARRIER PROPERTIES
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United States of America Patent
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Issued Date -
Mar 14, 2002
app pub date -
Sep 26, 1994
filing date -
Sep 27, 1993
priority date (Note) -
Abandoned
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Abstract
A single-ply or laminar biaxially oriented polypropylene film structure is described. The n-hexane-insoluble fraction of the film has a chain isotaxy index, measured by means of .sup.13C-NMR spectroscopy, of at least 95%. The base ply of the laminar structure (or the single ply of the single-ply structure) contains essentially no hydrocarbon resin or low molecular weight resin. The modulus of elasticity of the film structure in the longitudinal direction is greater than 2,500 N/mm.sup.2. The modulus of elasticity of the film structure in the transverse direction is greater than 4,00 N/mm.sup.2. A process for the production of the polypropylene film structure and the use thereof are also described.
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