| 摘要 |
<p>A process for copolymerizing ethylene, comprising the step of contacting ethylene, one or more non-conjugated cyclic diene and optionally one or more alpha olefins of formula CH2=CHT wherein T is a C1-C20 alkyl radical under polymerization conditions in the presence of a catalyst system obtainable by contacting: A) a metallocene compound of formula (I) wherein: M is titanium zirconium or hafnium; X, equal to or different from each other, is a hydrogen atom, a halogen atom, a hidrocabon group optionally containing heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements; R1 are C1-C40 hydrocarbon radical; R2, and R5 are hydrogen atoms, or C1-C20 hydrocarbon radicals; R6, equal to or different from each other, are C1-C20 hydrocarbon radicals; R3 and R4, form together a condensed saturated or unsaturaded C3-C7-membered ring; B) an alumoxane or a compound capable of forming an alkyl metallocene cation; and optionally (C) an organo aluminum compound.</p> |
