prov:value
| - As the aluminoxane compound, there can be used an aluminum compound represented by the general formula (2) or (3), wherein R is an alkyl group having 1 to 6 carbon atoms and, preferably, 1 to 4 carbon atoms, such as methyl group, ethyl group, propyl group, butyl group or isobutyl group and, particularly preferably, the methyl group provided that the aluminum compound may include an alkyl group hav
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