Acrylic block copolymer and adhesive composition

Abstract

[Object] To provide an acrylic block copolymer which can be used in an adhesive composition to give an excellent adhesive force, cohesive force, holding power, tack, and hot-melt coatability; and also to provide an adhesive composition containing such a block copolymer. [Solution] An acrylic block copolymer (I) contains at least two polymer blocks (A) containing methacrylic acid ester units and at least one polymer block (B) containing acrylic acid ester units, wherein the acrylic block copolymer (I) has structure of blocks (A)-(B)-(A), a weight average molecular weight (Mw) ranging from 30,000 to 100,000 and a melt viscosity of not more than 100,000 mPa·s, the melt viscosity being measured at 100° C. with a Brookfield viscometer.

Dependencies are inferred from the claim text.