| 摘要 |
A process for preparing isotactic 1- butene copolymers containing up to 30% by mol of units derived from of one or more alpha olefins of formula CH2=CHZ, wherein Z is a C3C20 hydrocarbon group comprising contacting 1-butene and one or more of said alphaolefins under polymerization conditions in the presence of a catalyst system obtainable by contacting: (A) a metallocene compound of formula (I) (1) wherein: M is an atom of a transition metal; p is an integer from 0 to 3; X, same or different, are hydrogen atoms, halogen atoms, or an hydrocarbon group; L is a divalent bridging group; R1 and R3 are hydrocarbon groups; R 2 and R4 are hydrogen atoms or hydrocarbon groups; T 1 and T2, equal to or different from each other are a moiety of formula (lI), (III) or (IV): wherein: the atom marked with the symbol * is bound the atom marked with the same symbol in formula (I); R5, R6, R7, R8 and R9, equal to or different from each other, are hydrogen or hydrocarbon groups; and (B) an alumoxane or a compound able to form an alkylmetallocene cation. |
