| http://www.w3.org/ns/prov#value | - ogeneity throughout each resulting polymer chain and throughout the total number of chains formed, and in the presence of a catalyst comprising: (a) an aluminoxane of the formula IX ##STR22## for the linear type and/or of formula X ##STR23## for the cyclic type, where, in the formulae IX and X, the radicals R13 are identical or different and are a C1 -C6 -alkyl group or phenyl or benzyl, and n is
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