Indenyl compounds and catalyst components for the polymerization of olefins

Claim 1

A process for polymerizing an olefin which comprises contacting at least one olefin with a 2-indenyl compound having an unsaturated aromatic six-membered ring, in the presence of a cocatalyst, under effective polymerization conditions, wherein said 2-indenyl compound is represented by the general formula R'Ind--M--(CP)--Q.sub.k ( 1) wherein Ind represents an indenyl group, R' represents a substituent, other than hydrogen, bound to the Ind group at the 2-position, Cp represents a cyclopentadienyl group, M represents a transition metal from group 4, 5, or 6 of the Periodic System of Elements, Q represents a ligand to M, and k is an integer linked to the valence of M, wherein k equals the valence of M minus two divided by the valence of Q, and wherein in said process for polymerizing an olefin, processes utilizing compounds in which the Cp-group is an indenyl group and in which either: a) the Ind- and the Cp-groups are bridged over the respective 1-positions, b) the indenyl compound is bis(2,3-dimethyl-1-indenyl)-zirconiumdichloride, or c) the indenyl compound is either ethylene-1-(3-but-3-enyl) inden-1-yl-2-((1-but-3-enyl)-inden-2-yl)-zirconiumdichloride, or ethylene-1-((3-allyldimethylsilyl) inden-1-yl)-2-((1-allyldimethylsilyl)inden-2-yl)zirconium-dichloride, are disclaimed as the process for polymerizing an olefin with a 2-indenyl compound.