Patent ID: 7641966

Claim:
A curable re-release adhesive comprising (1) a radiation-reactive polymer comprising a main chain and a plurality of intramolecular side chains, each side chain having a terminal carbon-carbon double bond, a chain length of 13 or more in terms of number of atoms, and the same or a different number of atoms as each other side chain in the polymer; and (2) a radiation-reactive oligomer in an amount of 0.1 to 150 parts by weight per 100 parts by weight of said radiation-reactive polymer; and said re-release adhesive having a shrinkage force of 3 MPa or less as developed upon curing with radiation, wherein said side chains are introduced into the radiation-reactive polymer by a method comprising copolymerizing a monomer containing a reactive functional group (a) with a comonomer to synthesize a polymer having the functional group (a) in its side chains, and then reacting the polymer having the functional group (a) with a compound having a functional group (b) that is reactive with the functional group (a) and one carbon-carbon double bond while maintaining the carbon-carbon double bond, such that the terminal carbon-carbon double bond of each side chain of the radiation-reactive polymer is the only carbon-carbon double bond of each side chain, wherein the functional group (a) is —OH and functional group (b) is —N═C═O, wherein the compound having the functional group (b) is 2-methacryloyloxyethyl isocyanate, and wherein the proportion of the monomer unit having a terminal carbon-carbon double bond and a chain length of 13 or more in terms of number of atoms in all monomer units is from 5 to 40 mol %.