| 摘要 |
<p>The invention describes a slurry process for producing ethylene polymers and copolymers with high productivity capability that will be particularly suitable for industrial practice. This process relates to contacting ethylene, optionally with one or more copolymerizable monomers, under slurry conditions with a supported zirconium biscyclopentadienyl metallocene wherein at least one cyclopentadienyl group contains a hydrocarbyl or hydrocarbylsilyl group that is a C4-C20 branched-alkyl or -silylalkyl substituent with said branch occurring at the second or third atom removed from the cyclopentadienyl rings thereof. Examples of poly(ethylene-hexene) made with bis(isobutylcyclopentadienyl) zirconium dichloride and bis((trimethylsilylmethyl)cyclopentadienyl) zirconium dichloride are presented with suitable comparisons of similar catalysts.</p> |
