| 摘要 |
<p>Metallocene complexes of a metal M selected from titanium, zirconium and hafnium, comprising at least one anionic group A containing an eta <5>-cyclopentadienyl ring co-ordinated with the metal M, wherein the anionic group is substituted in at least one position of the cyclopentadienyl ring with a radical having the formula: Ph*-(CR<6>R<7>)n wherein: R<6> and R<7> are independently hydrogen, halogen or a C1-C4 alkyl group, preferably hydrogen, "n" is 0 or 1, preferably 1, Ph* is a C6-C14 group comprising an aromatic ring linked to -CR<6>R<7>- or to A and substituted with at least one and up to a maximum of three electron-attractor groups, on the condition that, when A is an eta <5>-indenyl group and "n" is 0, at least one Ph* group is linked to A in position 1 or 3 of indenyl. These complexes can be used in (co)polymerization processes of alpha -olefins, possibly in the presence of a suitable co-catalyst, for the production of polyolefins with a very high molecular weight.</p> |
