Hydrogenated block copolymer and composition comprising the same

Abstract

A hydrogenated block copolymer having a number-average molecular weight of 40,000-700,000, obtained by hydrogenating at least 80% of the olefinic bonds of a block copolymer having in the molecule at least one each of a polymer block A composed of 90% by weight or more of a vinyl aromatic compound, a polybutadiene polymer block B having a 1,2-vinyl structure of 30-70%, and a polybutadiene polymer block C having a 1,2-vinyl structure of less than 30%, in which block copolymer the blocks A, B and C are contained at a specific ratio, or a unit of the block copolymer is bonded, via a coupling agent residue, to at least one polymer block unit of the blocks A, B and C and thereby the polymer molecular chain is extended or branched; and a thermoplastic resin composition comprising the hydrogenated block copolymer.

Dependencies are inferred from the claim text.