BLOCK COPOLYMER AND ADHESIVE COMPOSITION

摘要

There is provided a block copolymer composition having 20% by mass or more and 90% by mass or less of a component (A) and 10% by mass or more and 80% by mass or less of a component (B),
wherein the component (A) is a block copolymer having a polymer block mainly comprising a vinyl aromatic monomer unit and a polymer block mainly comprising a conjugated diene monomer unit, and having a weight-average molecular weight of 30,000 or higher and 190,000 or lower; and
the component (B) is a block copolymer having a polymer block mainly comprising a vinyl aromatic monomer unit and a polymer block mainly comprising a conjugated diene monomer unit, and having a weight-average molecular weight of 60,000 or higher and 500,000 or lower,
wherein the hydrogenation ratio of the conjugated diene monomer units in the component (A) and the component (B) is 10 to 80% by mol to the total amount of the conjugated diene monomer units of the component (A) and the component (B); and
the ratio of the weight-average molecular weight of the component (B) to the weight-average molecular weight of the component (A) is 1.3 to 10.