CN(CCN(C)C)C.[CH2:9]=[CH:10][C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1.C([Li])CCC.C=CC(=C)C>C1CCCCC1>[CH2:9]=[CH:10][C:11](=[CH2:12])[CH3:16].[CH2:9]=[CH:10][C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1In a pressure-resistant reactor, 23.3 kg of cyclohexane, 2.6 millimoles of TMEDA, and 1.35 kg of styrene were introduced, and while the content was stirred at 40° C., 86 millimoles of n-butyllithium was added thereto. Polymerization was carried out for one hour while the temperature was increased to 50° C. The polymerization conversion ratio of styrene was 100%. Subsequently, 7.1 kg of isoprene was continuously added to the reactor over one hour while the temperature was controlled to be maintained at 50° C. to 60° C. After the addition of isoprene was completed, polymerization was carried out for another one hour, and thus a styrene-isoprene block copolymer was formed. The polymerization conversion ratio of isoprene was 100%. Thereafter, 172 millimoles of methanol as a polymerization terminator was added thereto and mixed thoroughly therein, and thus the reaction was terminated. Incidentally, the amounts of the various reagents used in the reaction are summarized in Table 1. The reaction liquid obtained as described above was treated in the same manner as in Production Example 1, and thus a composition of Production Example 6 (block copolymer) was collected. Furthermore, a portion of the reaction liquid thus obtained was taken, and the same measurements as in Production Example 1 were carried out. These measurement values are presented in Table 2.
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