Alpha-olefin/propylene copolymers and their use
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United States of America Patent
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Jan 31, 2006
Grant Date -
Sep 22, 2005
app pub date -
May 6, 2005
filing date -
Aug 12, 1997
priority date (Note) -
Expired
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Abstract
Improved thermoplastic polymer blend compositions comprising an isotactic polypropylene component and an alpha-olefin and propylene copolymer component, said copolymer comprising crystallizable alpha-olefin sequences. In a preferred embodiment, improved thermoplastic polymer blends are provided comprising from about 35% to about 85% isotactic polypropylene and from about 30% to about 70% of an ethylene and propylene copolymer, wherein said copolymer comprises isotactically crystallizable propylene sequences and is predominately propylene. The resultant blends manifest unexpected compatibility characteristics, increased tensile strength, and improved process characteristics, e.g., a single melting point.
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