| http://www.w3.org/ns/prov#value | - According to the present invention, the aluminoxane used is one of the formula I ##STR1## for the linear type and/or the formula II ##STR2## for the cyclic type, where, in the formulae I and II, the radicals R can be identical or different and are each a C1 -C6 -alkyl group and n is an integer in the range 1-50.
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