[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.C=CC=C.CO.Cl>C[O-].C[O-].C[O-].C[Ti](C)(C)(C)(C)C1C=CC=C1.CO>[CH2:1]=[CH:2][CH:3]=[CH2:4].[CH2:1]=[CH:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1In a 1.0-liter reactor equipped with a stirrer were placed 100 ml of styrene and 6.0 mmol as aluminum atom of methylaluminoxane obtained in the above Example 1 (1), and the resultant was stirred at the polymerization temperature of 30° C. for 30 minutes. Subsequently, 56.3 g of 1,3-butadiene was charged in a stainless steel catalyst-input tube which had been sufficiently replaced with nitrogen, and added to the reaction system, and, at the same time, 0.03 mmol as titanium atom of pentamethylcyclopentadienyltitanium trimethoxide was added. And polymerization was carried out at 40° C. for 5 hours with stirring. After reaction was over, methanol was poured to stop the reaction. Further, a mixture of methanol-hydrochloric acid was added to decompose the catalyst components. Then, washing with methanol was repeated three times. The yield of thus obtained styrene-1,3-butadiene copolymer was 41.4 g. Intrinsic viscosity measured in 1,2,4-trichlorobenzene at 135° C. was 1.63 dl/g.
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