Patent ID: 8603630

Claim:
A radiation-curable adhesive composition comprising a base polymer as a principal base material, the base polymer includes structural units derived from at least a monomer A that has a functional group a; a monomer B that is formed from a methacrylate monomer that has an alkyl group that includes at least 10 and no more than 17 carbon atoms; and a monomer C that has both a functional group c that reacts with the functional group a and a polymerizable carbon-carbon double bond group, and a main chain of the base polymer is configured from the monomer B and the monomer A, the proportion of the monomer B being at least 50 wt % of the total monomers configuring the main chain; and the base polymer includes a polymerizable carbon-carbon double bond group in a side chain as a result of a portion of the functional group a in the monomer A reacting and bonding with the functional group c in the monomer C.