Patent ID: 8628847

Claim:
An adhesive binder, comprising a (meth)acrylic copolymer having repeating units represented by Formulae 1-1, 1-2, 1-3 and 1-4: in Formula 1-1, R1 is a hydrogen atom or a methyl group and R4 is a C 1 -C 20 alkyl group; in Formula 1-2, R2 is a hydrogen atom or a methyl group, R5 and R6 are each independently a C 1 -C 20 alkylene group, and R7 is a hydrogen atom or a methyl group; in Formula 1-3, R3 is a hydrogen atom or a methyl group and R5 is a C 1 -C 20 alkylene group; and in Formula 1-4, R3 is a hydrogen atom or a methyl group, R5 is a C 1 -C 20 alkylene group, Y is an oxygen or sulfur atom, n is 0 or 1, and Ar is a substituted or unsubstituted aromatic group, wherein the repeating units of Formulae 1-1, 1-2, 1-3, and 1-4 are included in the (meth)acrylate copolymer in a weight ratio of about 75˜90:1˜3:1˜5:5˜20.