Copper methacrylate undergoes high-yield copolymerization with hydroxi-ethylmethacrylate in the presence of 1,1,1-tris(hydroximethyl) propane trimethacrylate under -rays irradiation at room temperature. The bluish-green materials are characterized by bulk expanded volume measurements and infrared and ultraviolet-visible spectroscopy, and appear to be able to slowly release an appreciable percentage of the metal center embodied in the polymer network.