An organometallic composition which can be used as activating component in a metallocene catalyst for the (co)polymerization of &agr;-olefins, comprises: (A) a fluorinated di-unsaturated cyclic compound, having a relatively acid hydrogen atom, (B) an organometallic compound sufficiently basic to react with the acid hydrogen of the above compound (A), and (C) a polar aprotic organic compound, not containing metallic atoms, having a dielectric constant, in the pure state, equal to or greater than 2, and a weak coordinating capacity. Said composition allows a metallocene catalytic system of the ionic type to be obtained, with a high activity in the (co)polymerization of olefins and a reduced content of metallic residue in the polymeric product thus obtained.
一种可以用作
金属茂催化剂中活性组分的有机
金属化合物,用于α-烯烃的(共)聚合反应,包括:(A)一种含有相对酸性氢原子的
氟代二烯环化合物,(B)一种有机
金属化合物,足够碱性以与上述化合物(A)的酸性氢原子反应,以及(C)一种极性非脂肪有机化合物,不含
金属原子,在纯态下具有介电常数等于或大于2的弱配位能力。该组合物可以获得离子型
金属茂催化系统,在α-烯烃的(共)聚合反应中具有高的活性,并且所得到的聚合物产品中含有较少的
金属残留物。