| http://www.w3.org/ns/prov#value | - As the polymerization solvent for liquid phase polymerization, hydrocarbons capable of dissolving both the components of the zirconium or hafnium compound and the aluminoxane are used, and concretely, aromatic hydrocarbons such as benzene, toluene, o-xylene, m-xylene, p-xylene, ethylbenzene, butylbenzene, mesitylene, naphthalene, etc., preferably toluene and xylene are used.
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