Patent ID: 7935756

Claim:
A hydrogenated block copolymer that is a hydrogenated material of a copolymer comprising a conjugated diene and a vinyl aromatic compound, and has following properties (1) to (6): (1) the hydrogenated block copolymer has therein at least one of each of following polymer blocks a, b, and c: a. a vinyl aromatic compound polymer block A, b. a hydrogenated polymer block B of a random copolymer comprising a conjugated diene and a vinyl aromatic compound, and c. a hydrogenated polymer block C of a conjugated diene homopolymer having a vinyl bond content of not less than 30% obtained by adding conjugated diene monomers to a product of a polymerization of at least one of polymer blocks a and b; (2) the hydrogenated block copolymer has a vinyl aromatic compound content of more than 58 wt % and less than 95 wt %; (3) the hydrogenated block copolymer has a weight average molecular weight in a range of from 50,000 to 1,000,000; (4) a vinyl bond content of conjugated diene monomer units constituting a polymer of the hydrogenated polymer block B before hydrogenation is not less than 10% and less than 20%; (5) a double bond hydrogenation ratio of the conjugated diene monomer units is not less than 75%; and (6) the hydrogenated block copolymer has the vinyl aromatic compound polymer block A content in a range of from 25 to 50 wt %, the hydrogenated copolymer block B content in a range of from 30 to 80 wt %, and the hydrogenated polymer block C content in a range of from 10 to 35 wt %.