| 摘要 |
A process for producing a copolymer of ethylene containing from 0.1 to 99 % by mol of one or more derived units of alpha-olefins of formula CH2=CHA, wherein A is a C2-C20 alkyl radical, comprising contacting, under polymerization 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 M is zirconium, titanium or hafnium; X, same or different, is a hydrogen atom, a halogen atom, or an hydrocarbon group; R<1>, is a hydrocarbon group; R<2> R<3>, R<4>, R5 and R<6>, are hydrogen atoms or hydrocarbon groups; Q is a radical of formula (II), being bonded to the indenyl at the position marked by the symbol *; (II) wherein: T<1>, T<2>, T<3>, T<4> and T<5>, are carbon atoms (C) or nitrogen atoms (N); m<1>, m<2>, m<3>, m<4> and m<5> are 0 or 1; R<7>, R<8>, R<9>, R<10> and R<11> are hydrogen atoms or hydrocarbon groups; and b) an alumoxane or a compound capable of forming an alkyl metallocene cation. |
