Bridged metallocene complex for the (co)polymerization of...

C - Chemistry – Metallurgy – 07 – F

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C07F 17/00 (2006.01) C07C 13/465 (2006.01) C07C 15/24 (2006.01) C07C 25/22 (2006.01) C07F 7/08 (2006.01) C08F 4/64 (2006.01) C08F 10/00 (2006.01) C08F 10/02 (2006.01) C08F 4/659 (2006.01) C08F 210/16 (2006.01) C08F 210/18 (2006.01)

Patent

CA 2262868

A "bridged" bis-cyclopentadienyl complex which can be advantageously used for the formation of a catalytic system active in the (co) polymerization of ethylene and other .alpha.-olefins is represented by means of the following formula (II): (see formula II) wherein: M represents a metal selected from titanium, zirconium or hafnium; A' and A" each independently represent an anion containing an .eta.75-cyclopentadienyl ring coordinated to M; R' or R" each independently represents a group of an anionic nature a-bound to the metal M; B represents an unsaturated bivalent organic residue having from 1 to 30 carbon atoms, bound, respectively, to the ring of group A' and to the -CH2- methylene group by means of unsaturated carbon atoms. This complex, combined with a suitable cocatalyst, forms a catalyst with a high activity in the polymerization of olefins, producing polymers with a high molecular weight, especially in the case of the copolymerization of ethylene with a second .alpha.-olefin.

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