Multi-layered film
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United States of America Patent
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Issued Date -
Apr 12, 2007
app pub date -
Oct 12, 2005
filing date -
Oct 12, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
To provide a multi-layered film as transparent as that produced by T-die or water-cooled inflation molding, even when produced by air-cooled inflation molding, and excellent in tearing strength, impact strength, heat-sealing capacity at low temperature and interlayer strength. The multi-layered film comprises a propylene-based resin layer composed of a propylene/.alpha.-olefin random copolymer as the major component, which has a melt flow rate (MFR, determined at 230.degree. C.) of 1 to 30 g/10 minutes, melting peak temperature (Tm) of 110 to 165.degree. C. and Mw/Mn ratio of 1.5 to 3.5, and is produced in the presence of a metallocene catalyst, wherein the propylene-based resin layer is laminated, on each side, with a copolymer of ethylene and .alpha.-olefin of 3 to 12 carbon atoms, having an MFR (determined at 190.degree. C.) of 0.1 to 20 g/10 minutes and density: 0.860 to 0.925 g/cm.sup.3.
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