Patent ID: 7750079

Claim:
A method for producing a silicone hydrogel contact lens precursor composition, comprising: mixing a salt, a crosslinking agent, a first hydrophilic monomer, a hydrophobic monomer, a second hydrophilic monomer different than the first hydrophilic monomer, and a third hydrophilic monomer different than either the first hydrophilic monomer or the second hydrophilic monomer, to form a premix composition; mixing a first silicon containing macromer and a different second silicon containing macromer to form a macromer composition; contacting the premix composition with an initiator to form a premix/initiator composition; and contacting the premix/initiator composition with the macromer composition to form a polymerizable monomer-containing composition, wherein the salt is sodium dioctyl sulfosuccinate, the crosslinking agent is triallyl isocyanurate, the first hydrophilic monomer is N-vinyl-2-pyrrolidone, the hydrophobic monomer is isobornyl methacrylate, the second hydrophilic monomer is 2-hydroxybutyl methacrylate, the third hydrophilic monomer is N-vinyl-N-methylacetamide, the first silicon containing macromer is a polymethylsiloxane methacrylate derivative having a molecular weight of about 1,200, the second silicon containing macromer is a polysiloxanyl dimethacrylate having a molecular weight of about 15,000, and the initiator comprises an ultraviolet photoinitiator.