Patent ID: 7585570

Claim:
An adhesive comprising an acrylic resin (1), an acrylic resin (2), a silicone oligomer (3) and a crosslinking agent (4): wherein the acrylic resin (1) comprises a structural unit (a) derived from a monomer (A) and a structural unit (b) derived from a monomer (B) and has a weight-average molecular weight of 1,000,000 to 2,000,000, wherein the monomer (A) is a (meth)acrylic ester represented by the formula (A) (wherein R 1 represents hydrogen atom or methyl group, and R 2 represents alkyl or aralkyl groups having 1 to 14 carbon atoms wherein hydrogen atom(s) of the R 2 may be substituted with alkoxy group having 1 to 10 carbon atoms), and the monomer (B) is at least any one of a (B-1) and a (B-2) wherein (B-1) is a monomer comprising carboxyl group and one olefinic double bond, and (B-2) is a monomer comprising at least one polar functional group selected from the group consisting of hydroxy group, amide group, amino group, epoxy group, oxetanyl group, aldehyde group and isocyanate group and an olefinic double bond; the acrylic resin (2) comprises the structural unit (a) and the structural unit (b) and has a weight-average molecular weight of 50,000 to 500,000; wherein the silicone oligomer (3) comprises 2 to 100 structure units (s) derived from a compound (S1) and a compound (S2) respectively represented by (wherein R 3 and R 4 represent alkyl group or phenyl group, X and Y represent hydrogen atom, optionally substituted alkyl group, optionally substituted phenyl group, optionally substituted alkoxy group, optionally substituted phenoxy group, optionally substituted aralkyl group, optionally substituted aralkyloxy group, vinyl group, vinyloxy group, 1,2-epoxycyclohexyl group, 1,2-epoxycyclohexyloxy group, styryl group, styryloxy group, methacryloyloxy group, amino group, ureido group, mercapto group or isocyanate group).