| http://www.w3.org/ns/prov#value | - As described above, the zirconium compound having been n-bonded with a conjugated five-membered ring is carried on the oxide support having been treated with the alumoxane by adding the support and the zirconium compound sequentially or simultaneously to an aromatic hydrocarbon solvent such as benzene, toluene or the like and contacting them at a temperature of 20??? to 100??? C., preferably 40???
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