Olefin polymerization process employing metallocene catalyst provided by cocatalyst activation of a metallocene procatalyst
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United States of America Patent
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May 1, 2001
Grant Date -
N/A
app pub date -
Oct 15, 1998
filing date -
Oct 15, 1998
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Abstract
A polyolefin elastomer possessing a unique combination of properties, i.e., high molecular weight (M.sub.w), high Mooney viscosity (ML.sub.1+4 at 125.degree. C.), low polydispersity index (M.sub.w /M.sub.n) and low glass transition temperature (T.sub.g), is obtained by a polymerization process employing a particular type of a metallocene catalyst. The polyolefin elastomer is useful for manufacturing a variety of products including rubber articles such as hoses, belts and moldings, polymer blends containing one or more other hydrocarbon polymers and lubricating oils in which the elastomer functions as a viscosity modifier. Also disclosed is a cocatalyst for activating the metallocene procatalyst employing a specific molar ratio of the components of the cocatalyst to the transition metal of the procatalyst.
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