Bis-HEMA Poly(Butylene/Hexamethylene Carbonate)/IPDI Copolymer is a copolymer of Isophorone Diisocyanate and the polymer produced by the reaction of 1,4-Butanediol, Hexanediol and Dimethyl Carbonate, end-capped with 2-hydroxyethyl methacrylate HEMA.