Patent ID: 8772415

Claim:
A hydrogenated straight-chain block copolymer, obtained by selective hydrogenation of a straight-chain block copolymer comprising: i. at least two polymer blocks A, on both terminals thereof, which each comprise a vinyl aromatic monomer unit as a main component and which may be the same or different from each other; ii. at least two polymer blocks B, internally in relation to the polymer blocks A, which each comprise a conjugated diene monomer unit having 5 or more carbon atoms as a main component and which may be the same or different from each other; and iii. one or more polymer blocks selected from a. one or more polymer blocks C which each comprise a conjugated diene monomer unit having 4 or more carbon atoms as a main component and which may be the same or different from each other, b. one or more random copolymer blocks D which each comprise a conjugated diene monomer unit having 4 or more carbon atoms (d-1) and a vinyl aromatic monomer unit (d-2) as main components and which may be the same or different, and c. a combination of the polymer blocks C and D, wherein: a. the polymer block A has a weight-average molecular weight M of 21,000 or more; b. the polymer block B has a hydrogenation rate of 50% or less for olefinic unsaturated double bonds; c. the polymer blocks C and D have a hydrogenation rate of 80% or more for olefinic unsaturated double bonds; d. the block copolymer comprises 10% by weight to 85% by weight of the vinyl aromatic monomer unit; e. the block copolymer has contents of 10% by weight to 70% by weight of A, 1% by weight to 15% by weight of B, 0% by weight to 85% by weight of C, 0% by weight to 85% by weight of D and 25% by weight to 85% by weight of C+D, based on 100% by weight of the total of A+B+C+D; and f. the A, B, C, and D are arranged linearly.