Patent ID: 8163836

Claim:
An adhesive composition comprising a polymer as an adhesive ingredient, said polymer produced from monomers consisting essentially of: (a) styrene; (b) a (meth)acrylic ester monomer containing a cyclic skeleton; and (c) an alkyl (meth)acrylate monomer, wherein the polymer has a carboxyl group content of no higher than 1.0 mmol per gram of the polymer, and wherein the (meth)acrylic ester monomer containing a cyclic skeleton (b) comprises at least (b1) a (meth)acrylic ester monomer containing a cyclic skeleton having a substituent on the cyclic skeleton, wherein the substituent is selected from the group consisting of a polar group, a linear lower alkyl group having 1 to 4 carbon atoms, and a branched lower alkyl group having 1 to 4 carbon atoms, and (b2) a (meth)acrylic ester monomer containing a cyclic skeleton not having the substituent on the cyclic skeleton, and wherein the styrene (a) is blended in an amount of 30 to 90 parts by mass, the (meth)acrylic ester monomer containing a cyclic skeleton (b) is blended in an amount of 5 to 60 parts by mass, and the alkyl (meth)acrylate monomer (c) is blended in an amount of 10 to 60 parts by mass, wherein the sum of the parts by mass of the styrene (a), the (meth)acrylic ester monomer containing a cyclic skeleton (b) and the alkyl (meth)acrylate monomer (c) is 100.