ACRYLIC PRESSURE-SENSITIVE-ADHESIVE COMPOSITION AND PRESSURE-SENSITIVE-ADHESIVE TAPE

摘要

[Problem] To provide an acrylic pressure-sensitive-adhesive composition whereby a pressure-sensitive-adhesive tape having excellent fixing properties can be obtained. [Solution] A pressure-sensitive-adhesive composition containing an ABA-type triblock copolymer (a) comprising a segment (A) having a methacrylic acid ester as the main component thereof and a segment (B) having an acrylic acid ester as the main component thereof, an ABA-type triblock copolymer (b) comprising a segment (A) having a methacrylic acid ester as the main component thereof and a segment (B) having an acrylic acid ester as the main component thereof, and a tackifying resin (c) compatible with the triblock copolymer (a) and the triblock copolymer (b) and having a softening point of 110°C or above, the segment (B) of the triblock copolymer (b) having 2-ethylhexyl acrylate as a constituent monomer, and the triblock copolymer (b) being blended in a ratio of 0.1% by mass to 50% by mass with respect to the total amount of the triblock copolymer (a) and the triblock copolymer (b).