Bis-HPMA Poly(Caprolactone/1,4-Butanediol)/IPDI Copolymer is a urethane polymer formed by a multi-step process. First, a pre-polymer is made by condensing Epsilon-Caprolactone and 1,4-Butanediol, which is subsequently reacted with Isophorone Diisocyanate (IPDI). The resulting polymer is end-capped with Hydroxypropyl Methacrylate (HPMA).