ETHYLENE POLYMERS

摘要

A process for copolymerizing 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 comprising the step of contacting the monomers under polymerization conditions in the presence of a catalyst system comprising a metallocene compound of formula (I) wherein: M is titanium zirconium or hafnium; X, is a hydrogen atom, a halogen atom, a R, OR, OR'O, OSO2CF3, OCOR, SR, NR2 or PR2 group wherein R is an hydrocarbon radical and R' is a C1-C20-alkylidene, C6-C20-arylidene, C7-C20-alkylarylidene, or C7-C20-arylalkylidene radical; R1, is a C1-C20-alkyl radical; R2, R3, R4, R5, R6 and R7 are hydrogen atoms, or C1-C20 hydrocarbon radicals or two or more R2, R3 , R4, and R5 can also be joined to form a C3-C10 ring; L is a divalent C1-C40 hydrocarbon radical.