BLOCK COPOLYMER FOR ADHESIVE, PRODUCTION METHOD THEREFOR, AND ADHESIVE COMPOSITION

摘要

[Problem] To provide a block copolymer for adhesive that has a good finish, and an adhesive composition that has an excellent adhesive property and a good performance balance, and further an excellent solubility and coatability. [Solution] A block copolymer for adhesive, containing at least two polymer blocks of vinyl aromatic monomer unit (A) and at least one polymer block (B) containing conjugated diene monomer unit as a main component, wherein the amount (% by mass) of polymer blocks of vinyl aromatic monomer unit in the polymer block of vinyl aromatic monomer unit (A) is 95.0 to 99.0% relative to the total amount of vinyl aromatic monomer unit (% by mass) that has been used for polymerizing the polymer block of vinyl aromatic monomer unit (A), and the block copolymer for adhesive selectively contains block copolymer components (a) to (d) that have a specific structure provided with the polymer blocks (A) and (B).