| http://www.w3.org/ns/prov#value | - nt and water, wherein the volume ratio of the water-soluble organic solvent (A) to water (B) is (A):(B)=1:9 to 9:1, and wherein the polymerization catalyst is at least one member selected from the group consisting of(1) a metal compound represented by the formula (1) Lp.M.Xq ( 1) wherein M is a member selected from the group consisting of Ti, Zr, Hf and V;
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