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Nishikawa, et al., U.S. Pat. No. 5,436,295, Jul. 25, 1995 describes the reparation of block copolymer using a pressure-proof vessel equipped with a stirrer was charged with 3,000 g of cyclohexane, 50 g of sufficiently dewatered styrene and 0.01 mole of lithium sec-butyl followed by polymerization at 60. degree. C. for 60 minutes, addition of 200 g of a 50/50 by weight mixture of isoprene/butadiene followed by polymerization at 60. degree. C. for 60 minutes and addition of 50 g of styrene followed by polymerization for 60 minutes, to obtain a styrene-isoprene/1,3-butadiene-styrene block copolymer. Hydrogenation was conducted in the same manner as above to obtain a block copolymer having a hydrogenation ratio of 98%. This was named SEEPS-1. The block copolymer's olefinic elastomer block having a glass transition point of not higher than −20. degree. C. and a heat of fusion of crystal of not more than 8 cal/g.

1. customequipped with a stirrer
2. customfollowed by polymerization at 60
3. customfollowed by polymerization at 60
4. waitfor 60 minutes
5. customfollowed by polymerization for 60 minutes