ACRYLIC SELF-ADHESIVE COMPOSITION, ACRYLIC SELF-ADHESIVE, SELF-ADHESIVE SHEET, AND SUBSTRATE-FREE SELF-ADHESIVE SHEET

摘要

PROBLEM TO BE SOLVED: To provide an acrylic self-adhesive composition for forming a self-adhesive excellent in transparency and foaming resistance even when used under high temperature and high humidity environment, the self-adhesive being excellent in self-adhesive force and its retentivity under high temperatures, further excellent in these properties even when acid groups such as a carboxylic group are not introduced, and free from corrosion problems; and to provide an acrylic self-adhesive, self-adhesive sheet, and a substrate-free self-adhesive sheet.SOLUTION: An acrylic self-adhesive composition includes an acrylic resin (A) obtained by copolymerizing a copolymerization component [I] containing (meth)acrylic alkyl ester-based monomer (a1) essentially comprising an acrylic alkyl ester-based monomer (a1-1) having a 1-5C alkyl group, and a hydroxy group-containing monomer (a2), where the content of the hydroxy group-containing monomer (a2) is 15 wt.% or more to the whole copolymerization component [I], and the glass transition temperature of the acrylic resin (A) is -45°C or higher.