Metallocene catalyst compositions, processes for making polyolefin resins using such catalyst compositions, and products produced thereby
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United States of America Patent
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Jul 16, 2002
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N/A
app pub date -
Aug 31, 1999
filing date -
Aug 31, 1999
priority date (Note) -
Expired
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Abstract
A catalyst composition for the polymerization of one or more 1-olefins (e.g., ethylene) comprises a transition metal catalyst precursor and a cocatalyst, the transition metal catalyst precursor comprising a contact product of an unsubstituted metallocene compound and an aluminum alkyl compound in a hydrocarbon solvent solution. In another embodiment, the transition metal catalyst precursor is bimetallic and contains a non-metallocene transition metal catalyst component. When a bimetallic catalyst precursor is used, the resin product exhibits improved properties, and has a bimodal molecular weight distribution, long chain branching (LCB), and good bubble stability.
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