Process for the preparation of an olefin polymer using metallocenes containing specifically substituted indenyl ligands

Claim 1

A compound of the formula I ##STR9## in which M 1 is a metal from group IVb, Vb or VIb of the Periodic Table, R 1 and R 2 are identical or different and are a hydrogen atom, a C 1 -C 10 -alkyl group, a C 1 -C 10 -alkoxy group, a C 6 -C 10 -aryl group, a C 6 -C 10 -aryloxy group, a C 2 -C 10 -alkenyl group, a C 7 -C 40 -arylalkyl group, a C 7 -C 40 -alkylaryl group, a C 8 -C 40 -arylalkenyl group or a halogen atom, R 3 , R 4 and R 5 are identical or different and R 3 and R 4 and/or R 5 are other than hydrogen and are a C 1 -C 20 -alkyl group, a C 6 -C 20 -aryl group, a C 2 -C 10 -alkenyl group, a C 7 -C 40 -arylalkyl group, a C 7 -C 40 -alkylaryl group or a C 8 -C 40 -arylalkenyl group, these radicals optionally being halogenated, R 5 may alternatively be hydrogen, R 6 is ##STR10## ═BR 9 , ═AlR 9 , --Ge--, --Sn--, --O--, --S--, ═SO , ═SO 2 , ═NR 9 , ═CO, ═PR 9 or ═P(O)R 9 , where R 9 , R 10 and R 11 are identical or different and are a hydrogen atom, a halogen atom, a C 1 -C 10 -alkyl group, a C 1 -C 10 -fluoroalkyl group, a C 6 -C 10 -aryl group, a C 6 -C 10 -fluoroaryl group, a C 1 -C 10 -alkoxy group, a C 2 -C 10 -alkenyl group, a C 7 -C 40 -arylalkyl group, a C 8 -C 40 -arylalkenyl group or a C 7 -C 40 -alkylaryl group, or R 9 and R 10 or R 9 and R 11 , in each case together with the atoms connecting them, form a ring, M 2 is silicon, germanium or tin, R 7 and R 8 are identical or different and are as defined for R 9 , and m and n are identical or different and are zero, 1 or 2, where m plus n is zero, 1 or 2.