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In a 2 gallon autoclave reactor, 4,500 g of cyclohexane was placed. 9 g of tetrahydrofuran, 112.5 g of styrene monomer and 1.3 g of n-butyllithium were charged into the reactor and then the reaction mixture was subjected to polymerization for 1 hour. Thereafter, 525 g of 1,3-butadiene monomer was injected into the reactor to polymerize for one hour. Finally, 112.5 g of styrene monomer was added and then polymerized for one hour to obtain styrene-butadien-styrene living block copolymer with a number average molecular weight of about 100,000 which had a styrene content of 29.9% (block styrene content of 29.5%) and 1,2-vinyl bond content of 39.6% (27.9% when reduced into whole polymer). Living lithium in the polymer was present in an amount of 1.00 mmol per 100 g of polymer.

1. customthe reaction mixture was subjected to polymerization for 1 hour
2. customto polymerize for one hour
3. custompolymerized for one hour