Bis-HPMA Poly(Caprolactone/Neopentyl Glycol)/IPDI Copolymer is a urethane polymer formed by a multi-step process. First, a prepolymer is made by condensing Epsilon-Caprolactone and Neopentyl Glycol, which is subsequently reacted with Isophorone Diisocyanate. The resulting polymer is end-capped with Hydroxypropyl Methacrylate (HPMA).