Patent ID: 8492480

Claim:
A block copolymer composition comprising a block copolymer A represented by the following general formula (A) and a block copolymer B represented by the following general formula (B), wherein the ratio by weight of the block copolymer A to the block copolymer B (A/B) is from 36/64 to 85/15, and the proportion of aromatic vinyl monomer units relative to all the polymer components in the block copolymer composition is from 27 to 60% by weight: Ar1 a -D a -Ar2 a (A) Ar1 b -D b -Ar2 b (B); (in the general formulae (A) and (B), Ar1 a , Ar1 b and Ar2 b each represent an aromatic vinyl polymer block having a weight-average molecular weight of from 6,000 to 18,000; Ar2 a represents an aromatic vinyl polymer block having a weight-average molecular weight of from 40,000 to 400,000; D a represents a conjugated diene polymer block having a vinyl bond content of from 1 to 20% by mol; and D b represents a conjugated diene polymer block having a vinyl bond content of from 1 to 20 mol % and having a weight-average molecular weight of from 60,000 to 400,000).