Patent ID: 6960625

Claim:
A polyurethane-hydrogel composition, said composition being prepared by a method comprising: admixing at least one prepolymer and at least one water-soluble crosslinker in aqueous solvent and in the substantial absence of organic solvent to form a polyurethane-hydrogel mixture, said prepolymer being prepared from at least one water-soluble polyol and at least one isocyanate and being present in an amount of no greater than about 5 weight percent, said weight percent being based on total weight of all components; and (b) polymerizing said mixture to form a composition, wherein said composition is substantially polymerized, is transparent, has an effective number-average molecular weight between crosslinks and the crosslinker comprises an amine end-capped poly(ethylene oxide), or at least one of a 3-arm amine end-capped polyethyleneglycol or polyoxyethylene bis(amine).