prov:value
| - A catalyst system which comprises a metallocene, as the transition metal compound, and a cocatalyst, wherein said metallocene is a compound of the formula I ##STR13## in which M1 is a metal of group IVb, Vb or VIb of the periodic table,R1 and R2 are identical or different and are a hydrogen atom, a C1 -C10 -alkyl group, a C1 -C10 -alkoxy group, a C6 -C10 -aryl group, a C6 -C10 -aryloxy group, a C2
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