Patent ID: 9006359
Filing Date: 2015-04-14
Classification: C08G,G02B

Abstract:
1. A process for modifying the surface of a silicon-containing hydrogel, the process comprising the steps of: imbibing a zwitterionic monomer into the silicon-containing hydrogel in an imbibing mixture comprising the silicon-containing hydrogel, the zwitterionic monomer and a solvent system; wherein the imbibing absorbs the monomer into the hydrogel; and polymerizing the zwitterionic monomer to modify the surface of the silicon-containing polymer with a zwitterionic polymer in a polymerization reaction mixture, the polymerization reaction mixture comprising the imbibed silicon-containing hydrogel, a solvent system, the zwitterionic monomer and a free radical initiator, the polymerization reaction mixture having a composition that differs from the composition of the imbibing mixture.