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

摘要

An acrylic pressure-sensitive adhesive composition excellent in adhesion to poorly bondable adherends and to surfaces which have undergone a treatment for imparting water repellency or unsusceptibility to fouling, and in adhesion to rough surfaces. It withstands long-term use and has excellent cohesive force. The acrylic pressure-sensitive adhesive comprises as the main component an acrylic copolymer obtained by photopolymerizing a polymerizable composition comprising a monomer ingredient which comprises an alkyl (meth)acrylate having C2-14 alkyl and a vinyl monomer having a polar group and in which the acrylic monomer is a major component, an olefin polymer having a polymerizable unsaturated double bond at an end, and a photopolymerization initiator, and has a gel content represented by the following equation (1) of 50 to 80%. Gel content = (B/A) x 100 (1) A: Weight of the acrylic pressure-sensitive adhesive composition B: Weight on dry basis of insolubles in the acrylic pressure-sensitive adhesive composition after 48-hour immersion in 40°C tetrahydrofuran.