Patent ID: 9541676
Date: 2017-01-10
CPC Classifications: B29D,C07F,C08F,G02B

Claim:
1. A method for making silicone hydrogel contact lenses, comprising the steps of: introducing a lens-forming formulation into a mold for making contact lenses, wherein the lens-forming formulation comprises (a) a solvent selected from the group consisting of water, 1,2-propylene glycol, dipropylene glycol, tripropylene glycol, propylene glycol methyl ether, dipropylene glycol methyl ether, tripropylene glycol methyl ether, a polyethyleneglycol having a molecular weight of about 400 Daltons or less, and mixtures thereof, (b) at least one amphiphilic siloxane-containing vinylic monomer of formula (I) In which: (c) at least one hydrophilic vinylic monomer, and (d) at least one component selected from the group consisting of a hydrophilized polysiloxane-containing crosslinker, a hydrophilic crosslinker, a photoinitiator, a thermal initiator, a UV-absorbing vinylic monomer, a visibility tinting agent, an antimicrobial agent, a bioactive agent, a leachable lubricant, a leachable tear-stabilizing agent, and mixtures thereof; polymerizing the lens-forming formulation in the mold to form a silicone hydrogel contact lens, wherein the formed silicone hydrogel contact lens has a water content of from about 20% to about 75% by weight when fully hydrated, an oxygen permeability (Dk) of at least 40 barrers, and an elastic modulus of from about 0.1 MPa to about 2.0 MPa.