| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermoplastic elastomer composition excellent in flowability, permanent compression set and flexibility and a block copolymer providing the same.SOLUTION: There is provided a hydrogenated block copolymer obtained by hydrogenating a block copolymer obtained by reacting a living polymer represented by the formula (1): B-A-B-X (1), where Band Brepresent polymer blocks mainly comprising a structural unit derived from a conjugated diene compound, A represents a polymer block mainly comprising a structural unit derived from a vinyl aromatic compound, and X represents an active terminal of the living anionic polymer, and a coupling agent, wherein a ratio of the mass of the polymer block Bbefore hydrogenation to the total mass of Band Bis 0.10 to 0.45 and the content of the structural unit derived from the vinyl aromatic compound is 25 to 50 mass% relative to the mass of the hydrogenated block copolymer.SELECTED DRAWING: None |
