申请人:Enichem S.p.A.
公开号:US05936051A1
公开(公告)日:1999-08-10
Metallocene complexes of a metal M selected from titanium, zirconium and hafnium, comprising at least one anionic group A containing an .eta..sup.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.sup.6 R.sup.7).sub.n wherein: R.sup.6 and R.sup.7 are independently hydrogen, halogen or a C.sub.1 -C.sub.4 alkyl group, preferably hydrogen, "n" is 0 or 1, preferably 1, Ph* is a C.sub.6 -C.sub.14 group comprising an aromatic ring linked to --CR.sup.6 R.sup.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..sup.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.
从钛、锆和铪中选择的金属M的茂金属配合物,包括至少一个带有.eta..sup.5-环戊二烯基环与金属M配位的阴离子基团A,其中阴离子基团在环戊二烯基环的至少一个位置上用具有以下公式的基团取代:Ph*--(CR.sup.6 R.sup.7).sub.n,其中:R.sup.6和R.sup.7独立地是氢、卤素或C.sub.1-C.sub.4烷基,优选为氢,"n"为0或1,优选为1,Ph*是包括与--CR.sup.6 R.sup.7--或A连接的芳香环并被至少一个和最多三个电子亲和基团取代的C.sub.6-C.sub.14基团,在A为.eta..sup.5-茚基基团且"n"为0时,至少一个Ph基团连接到茚基的1或3位置。这些配合物可用于α-烯烃的(共)聚合过程,可能在适当的共催化剂存在下,用于生产具有非常高分子量的聚烯烃。