| http://www.w3.org/ns/prov#value | - ferent and are a C1 -C6 -alkyl group or phenyl or benzyl, and n is an integer from 0 to 50, and of a metallocene of the formula XI ##STR16## in which M1 is titanium, zirconium, hafnium, vanadium, niobium or tantalum, R14 and R15 are identical or different and are a hydrogen atom, a halogen 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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