Bis-HEMA Poly(Pentylene/Hexamethylene Carbonate)/IPDI Copolymer is a urethane polymer formed by a multi-step process. First, a prepolymer is made by condensing 1,5-Pentanediol, Hexanediol and Dimethyl Carbonate, which is subsequently reacted with Isophorone Diisocyanate. The resulting polymer is end-capped with HEMA