ACTIVATING ORGANOMETALLIC COMPOSITION FOR THE (CO)POLYMERIZATION OF ALPHA-OLEFINS COMPRISING FLUORINATED CYCLOPENTADIENYL COMPOUNDS

摘要

An organometallic composition which can be used as activating component in a metallocene catalyst for the (co)polymerization of .alpha.-olefins, comprise s: (A) a fluorinated di-unsaturated cyclic compound, having a relatively acid hydrogen atom, (B) an organometallic compound sufficiently basic to react wi th the acid hydrogen of the above compound (A), and (C) a polar aprotic organic compound, not containing metallic atoms, having a dielectric constant, in th e pure state, equal to or greater than 2, and a weak coordinating capacity. Sa id 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.< /SDOAB>