Elastic films including crystalline polymer and crystallizable polymers of propylene
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United States of America Patent
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Dec 31, 2002
Grant Date -
N/A
app pub date -
May 11, 2000
filing date -
May 13, 1999
priority date (Note) -
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Abstract
Improved thermoplastic polymer elastic film blend compositions including a crystalline isotactic polypropylene component and a crystallizable alpha-olefin and propylene copolymer component, the copolymer having crystallizable alpha-olefin sequences. In a preferred embodiment, improved thermoplastic polymer blends are provided made up of from 0% to 95%, preferably 2% to 40 weight % of the crystalline isotactic polypropylene and from 5% to 100%, preferably 60% to 98 weight % of a crystallizable ethylene and propylene copolymer, wherein the copolymer has isotactically crystallizable propylene sequences and is predominately propylene. The resultant blends manifest unexpected compatibility characteristics, and improved resistance to elastic deformation of the crystalline isotactic polypropylene and from of a crystallizable ethylene and propylene copolymer.
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