Soft contact lens with high moisture content and method for producing the same

A method for producing moisture-containing soft contact lenses, comprising the steps of:

• polymerizing a mixture comprising (1) 50-75% by weight of two or more hydrophilic monomers selected from the group consisting of 2-hydroxyethyl methacrylate, N vinyl-2-pyrrolidone and N,N-dimethylacrylamide, (2) 3-20% by weight of an alkyl methacrylate, (3) a cross-linking monomer, and (4) a diluent consisting essentially of one or more constituents selected from the group consisting of triethylene glycol, diethylene glycol monomethyl ether and triethylene glycol monomethyl ether;
• and
• substituting an aqueous solution for the diluent and
• wherein the cross-linking monomer comprises one or more monomers selected from the group consisting of diacrylates of polyalcohols and monomers having at least one allyl group in each molecule
• and wherein the alkyl methacrylate is methyl methacrylate and/or ethyl methacrylate.

A method for producing moisture-containing soft contact lenses, comprising the steps of:

• polymerizing a mixture comprising (1) 50-75% by weight of two or more hydrophilic monomers selected from the group consisting of 2-hydroxvethyl methacrylate, N vinyl-2-pyrrolidone and N,N-dimethylacrylamide, (2) 3-20% by weight of an alkyl methacrylate, (3) a cross-linking monomer, and (4) a diluent consisting essentially of one or more constituents selected from the group consisting of triethylene glycol, diethylene glycol monomethyl ether and triethylene glycol monomethyl ether;
• and
• substituting an aqueous solution for the diluent and
• wherein the monomers contain 0.1-2% by weight of the cross-linking monomer based on the total amount of the hydrophilic monomers and the alkyl methacrylate
• and wherein the alkyl methacrvlate is methyl methacrylate and/or ethyl methacrylate.