Process for rendering silicone rubber contact lenses hydrophilic
AssigneeTitmus Eurocon
InventorsGerhard Kossmehl, Dietrich Quast, Horst Schafer
Life of this patent
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Abstract
Process for rendering silicone rubber contact lenses hydrophilic by first reacting the silicone rubber with an oligomeric siloxane containing SiH groups in the presence of a catalyst and then subjecting the resulting equilibrated silicone rubber to a reaction with an aqueous base; or a silane addition reaction with a reactant containing C.dbd.C double bonds.
Claims13
Process for rendering silicone rubber contact lenses hydrophilic, which process comprises, as a first step, reacting the silicone rubber with an oligomeric siloxane containing SiH groups in the presence of a catalyst and a solvent which is a weak swelling agent for the silicone rubber and, in a second step, subjecting the resulting equilibrated silicone rubber to
- (i) a reaction with an aqueous base in the presence of an alkali metal hydroxide;
- or
- (ii) a silane addition reaction with a reactant containing C.dbd.C double bonds.
Dependencies are inferred from the claim text.