BLOCK COPOLYMER COMPOSITION AND ADHESIVE COMPOSITION

摘要

A block copolymer composition including:
10% by mass or more and 90% by mass or less of a component (a), and 10% by mass or more and 90% by mass or less of a component (b), wherein
the component (a) is a block copolymer containing a polymer block (A) primarily including a vinyl aromatic monomer unit and a polymer block (B) primarily including a conjugated diene monomer unit, wherein the block copolymer has a weight average molecular weight of 30,000 or higher and 150,000 or lower;
the component (b) is a block copolymer containing a polymer block (A) primarily including a vinyl aromatic monomer unit and a polymer block (B) primarily including a conjugated diene monomer unit;
the component (b) includes a component (b-2) at a ratio of weight average molecular weight to the weight average molecular weight of the component (a) of 2.5 or more and less than 3.4, and a component (b-3) at a ratio of weight average molecular weight to the weight average molecular weight of the component (a) of 3.4 or more and less than 4.5; and
the content of the vinyl aromatic monomer unit in the component (a) and the component (b) is 10 to 50% by mass based on the total amount of the component (a) and the component (b).