| 摘要 |
<p>A polyolefin elastomer possessing a unique combination of properties, i.e., high molecular weight (Mw), high Mooney viscosity (ML1+4 at 125 °C), low polydispersity index (Mw/Mn), low glass transition temperature (Tg) and low hysteresis (tan δ), is obtained by a polymerization process employing a particular type of 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 cation-generating cocatalyst for activating a metallocene procatalyst, preferably in the presence of olefin monomer.</p> |
