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Abstract

The present invention relates to soluble catalyst systems for the polymerization of C.sub.2 - to C.sub.10 -alk-l-enes, containing, as active constituents, a) a metallocene complex of the general formula I ##STR1## where R.sup.1 and R.sup.2 are branched C.sub.4 - to C.sub.10 -alkyl, 5-to 7-membered cycloalkyl, which may itself be substituted by C.sub.1 - to C.sub.6 -alkyl, or are C.sub.6 - to C.sub.15 -aryl or aralkyl; R.sup.3 to R.sup.6 are C.sub.1 - to C.sub.8 -alkyl, M is titanium, zirconium, hafnium or vanadium, Y is silicon or germanium, and X is halogen or C.sub.1 - to C.sub.8 -alkyl, b) and an open-chain or cyclic aluminoxane compound of the general formula II or III ##STR2## where R.sup.7 is C.sub.1 -C.sub.4 -alkyl, and m is from 5 to 30. These catalyst systems are particularly suitable for the preparation of polypropylene and copolymers of propylene with lesser amounts of other C.sub.2 - to C.sub.10 -alky-l-enes.

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First Claim