Process for the copolymerization of ethylene

摘要

A process for producing a polymer of ethylene containing from 0.1 to 50% by weight of one or more derived units of alpha-olefins fo formula CH₂-CHR, wherein R is a C₂-C₂₀ alkyl radical, comprising contacting, under ploymerization conditions, ethylene and one or more alpha-olefins in the presence of a catalyst system obtainable by contacting: a) a metallocene compound of formula (I) wherein: is zirconium titanium or hafminum, X, equal to or different from each other, is hydrogen halogen or an hydrocarbyl radical, R¹, R², R³, R⁴, R⁵, R⁶, R⁷, R⁸ and R⁹, equal to or different from each other are hydrogen atoms, halogen atoms, or hydrocarbyl radicals; and b) an alumoxane or a compound capable of forming an alkyl metallocene cation.