| abstract |
Catalyst systems for the polymerization of C 2 -C 10 -alk-1-enes contain, as active components, n a) a metallocene complex of the general formula I ##STR1## where M is titanium, zirconium, hafnium, vanadium, niobium or tantalum, X is halogen or C 1 --C 8 -alkyl, Y is carbon, phosphorus, sulfur, silicon or germanium, Z is C 1 -C 8 -alkyl, C 3 -C 10 -cycloalkyl or C 6 -C 10 -aryl, R 1 and R 2 are identical or different and are each C 1 -C 4 -alkyl, R 3 to R 6 are identical or different and are each hydrogen or C 1 -C 8 -alkyl, or two adjacent radicals R 3 and R 4 and R 5 and R 6 in each case together form a hydrocarbon ring system of 4 to 15 carbon atoms and n is 0, 1 or 2, and n b) an open-chain or cyclic alumoxane compound of the general formula II or III ##STR2## where R 7 is C 1 -C 4 -alkyl and n is from 5 to 30. The novel catalyst systems are particularly suitable for the preparation of polyalk-1-enes having high molecular weights. |