| 摘要 |
Metallocene cpds. of formula R<5>nCp<1>Cp<2>M<1>R<1>R<2> (I) are new, in which Cp<1>, Cp<2> = opt. substd. cyclopentadienyl; n = 0 or 1; R<5> = bridging gp.; M<1> = Gp. IVb, Vb or VIb metal; R<1>, R<2> = H or 1-40C carbon-contg. gp. At least one of the Cp gps. is substd. with at least one 3-30C cyclic gp. contg. at least one ring-heteroatom or with a 2-30C condensed-ring system contg. at least one ring- heteroatom. Also claimed is (1) a catalyst component contg. cpd(s). (I) and cocatalyst(s); and (2) a process for the prodn. of polyolefins by polymerisation of olefins in presence of a catalyst contg. (I) and cocatalyst(s).
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