ZIEGLER-NATTA CATALYST COMPOSITIONS FOR PRODUCING POLYETHYLENES WITH A HIGH MOLECULAR WEIGHT TAIL AND METHODS OF MAKING THE SAME
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United States of America Patent
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Issued Date -
Jun 2, 2011
app pub date -
Aug 6, 2009
filing date -
Aug 6, 2008
priority date (Note) -
Abandoned
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Abstract
Methods of preparing a polymerization catalyst component is provided, in which a magnesium component, a Lewis acid solubilizing component, a titanium compound, optionally a transition metal compound different than the titanium compound, and typically an inert filler are combined in a slurrying agent and spray-dried to produce a catalyst precursor in the form of a substantially spherical and porous solid particle. The methods and catalysts of this disclosure can provide ethylene homopolymer and copolymer resins having a high molecular weight tail and a broadened molecular weight distribution as compared to more traditional Ziegler-Natta catalysts.
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