A process for preparing a butyl polymer, the process comprising contacting a C4 to C8 monoolefin monomer with a C4 to C14 multiolefin monomer at a temperature in the range of from about -100°C to about +50°C in the presence of a diluent and a catalyst mixture comprising a monoalkylaluminum dihalide and an aluminoxane, with the proviso that the catalyst mixture does not contain a dialkylaluminum monohalide.
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