BLOCK COPOLYMER COMPOSITION FOR ADHESIVES, AND ADHESIVE COMPOSITION

摘要

It is an object to provide a block copolymer composition for a viscous adhesive, which will be a viscous adhesive composition excellent in balance of the adhesive properties such as tack strength and tackiness, having a low melt viscosity, and excellent solubility, coating properties, ejection stability, and surface skin quality. The block copolymer composition for a viscous adhesive having:
a component (a) in an amount of 50 mass% or more and 90 mass% or less; and
a component (b) in an amount of 10 mass% or more and 50 mass% or less;
a content of the vinyl aromatic monomer unit being 25 to 50 mass%;
a viscosity of the 15 mass% toluene solution being 10 to 40 mPa·s; and
a number average molecular weight ratio of the component (b) to the component (a) being 2.0 to 4.0.