| http://www.w3.org/ns/prov#value | - b) a soluble activator selected from the group consisting of activators of the formula AIR.sub.(3-n) Xn in which R is a C1-8 alkyl radical, X is a halogen atom and n is 0, 1, or 2; alkyl aluminoxane compounds in which the alkyl group has from 1 to 8 carbon atoms and boron trihalide, tetraphenylborate and tri-or tetra(pentafluorophenyl) boron compounds or complexes,
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