Bis-HEMA Polycaprolactone/Poly(1,4-Butanediol)-6/IPDI Copolymer is a urethane polymer formed by a multi-step process. First Epsilon-Caprolactone is reacted with Poly(1,4-Butanediol)-6. This polyester is then reacted with Isophorone Diisocyanate to form a polyurethane. The resulting polymer is end-capped with HEMA.