| 摘要 |
Process for the polymerization of olefins comprising contacting olefins under polymerization conditions in the presence of a catalyst system comprising the product obtained by contacting:(A) at least one transition metal organometallic compound, pyrolidyl bis(eta-cyclopentadienyl)methylzirconium being excluded, and(B) an organometallic compound obtained by contacting:(a) a Lewis base having formula (I):wherein R<a>, R<b>, R<c >and R<d>, equal to or different from each other, are selected from the group consisting of hydrogen, halogen, linear or branched, saturated or unsaturated, C1-C10 alkyl, C6-C20 aryl, C7-C20 arylalkyl and C7-C20 alkylaryl groups; withb) a Lewis acid of formula (II)wherein Mt is a metal belonging to Group 13 of the Periodic Table of the Elements; R<1>, equal to or different from each other, are selected from the group consisting of halogen, halogenated C6-C20 aryl and halogenated C7-C20 alkylaryl groups; and(C) optionally an alkylating agent.
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