Patent ID: 8785546

Claim:
A hydrogenated block copolymer, obtained by a process comprising hydrogenating a coupling agent and a block copolymer which is obtained by reacting a living polymer of formula (1): B 1 -A-B 2 —X (1) wherein B 1 is a polymer block mainly comprising a structural unit derived from a conjugated diene compound comprising a mixture of 1,3-butadiene and isoprene, B 2 is a polymer block mainly comprising a structural unit derived from the same conjugated diene compound, A is a polymer block mainly comprising a structural unit derived from a vinyl aromatic compound, X is an active terminal end of a living anion polymer, 80% or more of carbon-carbon double bonds in the polymer blocks B 1 and B 2 are hydrogenated, a ratio of a mass of the polymer block B 1 to a total mass of B 1 and B 2 before hydrogenation is from 0.10 to 0.45, and a content of the structural unit derived from the vinyl aromatic compound is from 25 to 50 mass % based on the mass of the hydrogenated block copolymer.