High melt strength polypropylene
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United States of America Patent
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Issued Date -
Aug 30, 2007
app pub date -
Feb 27, 2006
filing date -
Feb 27, 2006
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Abandoned
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Abstract
A method for producing a polypropylene-containing composition which includes (a) polymerizing a first quantity of propylene in a first reaction zone in the presence of a first polymerization catalyst to provide a first quantity of polypropylene having a weight-average molecular weight M.sub.w,A; (b) polymerizing a second quantity of propylene optionally mixed with a minor amount of one or more olefins other than propylene in a second reaction zone in the presence of a second polymerization catalyst to provide a second quantity of polypropylene comprising a polypropylene homopolymer or random copolymer and having a weight-average molecular weight M.sub.w,B; and (c) combining the first quantity of polypropylene with the second quantity of polypropylene to form a bimodal polypropylene; wherein the percent by weight of the first quantity of polypropylene in the bimodal polypropylene composition is equal to or greater than 65 percent, and the ratio M.sub.w,B/M.sub.w,A is at least about 2.
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