Adhesive composition, double-coated adhesive sheet, adhesion method and portable electronic devices

摘要

The adhesive composition of the present invention has a gel fraction of 20-50%, which comprises an acrylic polymer obtained by polymerizing a monomer mixture containing the following component (a) as a main component and the following component (b) in a proportion of 5-49 wt %: component (a): an alkyl (meth)acrylate wherein the alkyl group has 4 to 12 carbon atoms, component (b): a carboxyl group-containing monomer having a carboxyl group and an ethylenic unsaturated double bond, which affords, when polymerized, a homopolymer having a glass transition temperature of not more than 70° C. Since the adhesive composition of the present invention is superior in all of the adhesion, impact resistance and repulsion resistance, it can adhere even to a part having a coated film formed on a surface to be adhered.