Hydrogenated block copolymer and composition containing same

摘要

To provide a thermoplastic elastomer composition excellent in fluidity, compression set property, and flexibility, and a hydrogenated block copolymer that provides the composition. The hydrogenated block copolymer is obtained by hydrogenating a block copolymer which is obtained by reacting a living polymer represented by the following formula (1):
B1-A-B2—X  (1)
wherein B1 and B2 each represent a polymer block mainly including a structural unit derived from a conjugated diene compound, A represents a polymer block mainly including a structural unit derived from a vinyl aromatic compound, and X represents an active terminal end of a living anion polymer, with a coupling agent, wherein the ratio of the mass of the polymer block B1 to the total mass of B1 and B2 before hydrogenation is from 0.10 to 0.45; and the 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.

主权项

1. 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):
B1-A-B2—X  (1) wherein B1 is a polymer block mainly comprising a structural unit derived from a conjugated diene compound comprising a mixture of 1,3-butadiene and isoprene, B2 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 B1 and B2 are hydrogenated, a ratio of a mass of the polymer block B1 to a total mass of B1 and B2 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.