Bis-HPMA Poly(Methylpentanediol Adipate)/IPDI Copolymer is a urethane polymer formed by a multi-step process. First, a prepolymer is made by condensing 3-methyl-1,5-pentanediol and Adipic Acid, which is subsequently reacted with Isophorone Diisocyanate (IPDI. The resulting polymer is end-capped with Hydroxypropyl Methacrylate (HPMA).