| 摘要 |
Polymers of C2-C10 alkenes are prepared in the presence of catalyst systems comprising as active constituentsA) a metallocene complex of the general formula I where the substituents and indices have the following meanings:M is titanium, zirconium, hafnium, vanadium, niobium or tantalum,R1 to R4 are hydrogen, C1-C10-alkyl, 5- to 7-membered cycloalkyl which in turn can bear a C1-C10-alkyl as substituent, C6-C15-aryl or arylalkyl, where two adjacent radicals may also together be cyclic groups having from 4 to 15 carbon atoms, Si(R6)3, whereR6 is C1-C10-alkyl, C6-C15-aryl or C3-C10-cycloalkyl,R7 and R8 are hydrogen, C1-C10-alkyl, C6-C15-aryl or C3-C10-cycloalkyl,R9 and R10 are C1-C10-alkyl, C6-C15-aryl or C3-C10-cycloalkyl,Y is nitrogen, phosphorus, arsenic, antimony, or bismuth,Z is oxygen, sulfur, selenium or tellurium,n is an integer in the range from 0 to 10,B) a compound forming metallocenium ions.
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