Uniroyal Chemical Company, Inc.

Willie C Burton

Daniel J Gillis

Xu Wu Feng

A polyolefin elastomer possessing a unique combination of properties, i.e., high molecular weight (M,), high Mooney viscosity (ML,at 125&deg; C.), low polydispersity index (M,/M,) and low glass transition temperature (T,), 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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Naugatuck, CT, United States of America

Willie C Burton