| abstract |
The present invention relates to a metallocene of the formula I, ##STR1## for preparing polyolefins, where M 1 is preferably Zr, Hf or Ti, R 1 and R 2 are each a hydrogen atom, a C 1 -C 3 -alkyl group, a C 1 -C 3 -alkoxy group, a C 6 -C 8 -aryl group, a C 6 -C 8 -aryloxy group, a C 2 -C 4 -alkenyl group, a C 7 -C 10 -arylalkyl group, a C 7 -C 12 -alkylaryl group, a C 8 -C 12 -arylalkenyl group or chlorine, R 3 is a chlorine atom, a C 1 -C 3 -alkyl group, a C 2 -C 4 -alkenyl group, a C 6 -C 8 -aryl group, an NR 16 2 , SR 16 , OSiR 16 3 , SiR 16 3 or PR 16 2 radical where R 16 is chlorine, a C 1 -C 4 -alkyl group or a C 6 -C 8 -aryl group. R 4 is a hydrogen atom, R 13 is --(R 14 M 2 R 15 )--, --(R 14 CR 15 )--(R 14 CR 15 )--, --(R 14 CR 15 )--(R 14 M 2 R 15 )-- or --(R 14 CR 15 )--, where R 14 and R 15 are each a hydrogen atom, chlorine, an Si(methyl) 3 group, an N(methyl) 2 group, an N(phenyl) 2 group, an Si(phenyl) 3 group, a B(methyl) 2 group, a B(phenyl) 2 group, a C 1 -C 4 -alkyl group, in particular a methyl group, a CF 3 group, a C 6 -C 12 -aryl group, a pentafluorophenyl group, a C 1 -C 4 -alkoxy group, in particular a methoxy group, a C 2 -C 4 -alkenyl group, a C 7 -C 10 -arylalkyl group, a C 8 -C 12 -arylalkenyl group or a C 7 -C 12 -alkylaryl group, or R 14 and R 15 together with the atoms connecting them form a ring, M 2 is silicon or germanium, z is 0 or 1, R x and R y are identical where R 5 to R 9 are as defined for R 14 , and l+m+n+o+p≧2 and ≦5, and l+n+p is ≧1, where l, n, m, o or p can be 0, 1, 2 or 3 or R 5 to R 9 together with the atoms connecting them form one or more rings. |