| abstract |
A catalyst system comprising n a) at least one support, n b) at least one metallocene and n c) at least one compound of the formula (I) n where n M 1 is an element of group IIa, IIIa, IVa or Va of the Periodic Table of the Elements, n x is 0 or 1, n y is 0 or 1, n z is 0 or 1, n A is a cation of group Ia, IIa, IIIa of the Periodic Table of the Elements, a carbenium, oxonium, phosphonium or sulfonium cation or a quaternary ammonium compound, n Q 1 , Q 2 , Q 3 are each a ligand system based on a biphenyl framework bound to M 1 via the positions 2 and 12 and having the formula (II) n where n R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 are identical or different and are each a hydrogen atom, a halogen atom, a C 1 -C 40 group, or an OSiR 3 9 group, where R 9 are identical or different and are each a hydrogen atom, a halogen atom, a C 1 -C 40 group and two or more radicals R 1 to R 8 may be joined to one another so as to form a monocyclic or polycyclic ring system which may be substituted. |