| 摘要 |
The invention relates to a compound according to the formula (XR5<->)(NR'4<+>), wherein X represents Si, Ge, Sn or Pb, the R groups may be the same or different, each being a monoanion chosen from the group comprising hydrogen, an alkyl group, an aryl group, an arylalkyl group, and the R' groups may be the same or different, each representing a hydrocarbon group containing 1-10 carbon atoms. The invention also relates to a process for the preparation of a compound of formula (XR5<->)(NR'4<+>), to an ion exchange process wherein the NR'4<+> is exchanged for another cation, and to the use of (XR5<->)(NR'4<+>) and the product of said ion exchange process as a cocatalyst in the polymerization of olefins.
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