Branched crystalline polypropylene
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United States of America Patent
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Oct 21, 2008
Grant Date -
Jul 1, 2004
app pub date -
Oct 10, 2003
filing date -
Oct 24, 2002
priority date (Note) -
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Abstract
Branched crystalline polypropylene compositions and methods for the preparation of branched crystalline polypropylene compositions are provided. For example, described herein is a process of preparing a branched crystalline polypropylene composition that includes combining two or more different metallocene catalyst compounds with a polymerization medium that includes propylene, for a time sufficient to provide branched crystalline polypropylene that has from 0.0 wt % to 2.0 wt % ethylene and a heat of fusion of 70 J/g or more.
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