Hydrogenated block copolymer, Polypropylene resin composition using the same, and its molded object

摘要

The present invention provides a hydrogenated block copolymer having, in a molecule, a polymer block (S) mainly composed of vinyl aromatic compound units and a polymer block (B) mainly composed of conjugated diene compound units, in the hydrogenated block copolymer described above. Content of a polymer block (S) is 5-20 mass%, content of the said polymer block (B) is 80-95 mass%, The said polymer block (B) makes a polymer block (B1) and a polymer block (B2) It includes, the vinyl bond amount before the hydrogenation of the polymer block (B1) is 30 to 60 mol%, the vinyl bond amount before the hydrogenation of the polymer block (B2) is more than 60 to 100 mol%, in the hydrogenated block copolymer, Content of a polymer block (B1) is 5-60 mass%, content of the said polymer block (B2) is 30-85 mass%, and content of the structure represented by following formula (1) in the said hydrogenated block copolymer is Within 40 100 wt.%, Provides a hydrogenation rate of the hydrogenated block copolymer at least 70 mol%, the hydrogenated block copolymer. (SB)... Formula (1) (In formula (1), S means a polymer block (S) and B means a polymer block (B).)