| http://www.w3.org/ns/prov#value | - he formulae II and III, the radicals R may be identical or different and are a C1 -C6 -alkyl group, a C1 -C6 -fluoroalkyl group, a C6 -C18 -aryl group, a C1 -C6 -fluoroaryl group or a hydrogen, and n is an integer from 0 to 50, or, instead of the aluminoxane, comprises a mixture of an aluminoxane of the formula II and/or of the formula III with a compound AlR3, which comprises using, as the transi
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