Polynuclear metallocene compound, process for preparing it and its use as catalyst

摘要

Metallocene cpds. of formula (I) with at least two different metallocene fragments L-MX2-L are new: (I) B = bridging unit; m = 2-100,000; M = Gp. IVb, Vb or VIb metal; X = H, 1-40C hydrocarbon-contg. gp., OH, halogen or pseudohalogen L = a pi-ligand or other electron donor. Also claimed is (i) a catalyst component contg. cpd(s). (I) and cocatalyst(s); (ii) a process for the prodn. of olefin polymers by polymerisation of olefin(s) in presence of a catalyst as in (i); (iii) polyolefins obtd. by this process.