Ionic silicone hydrogels
AssigneeJohnson & Johnson Vision Care, Inc.
InventorsAzaam Alli, James D. Ford, Douglas G. Vanderlaan, Scott L. Joslin
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Abstract
The present invention relates to a process comprising the steps of reacting a reactive mixture comprising at least one silicone-containing component, at least one hydrophilic component, and at least one diluent to form an ophthalmic device having an advancing contact angle of less than about 80°; and contacting the ophthalmic device with an aqueous extraction solution at an elevated extraction temperature, wherein said at least one diluent has a boiling point at least about 10° higher than said extraction temperature.
Claims83
A silicone hydrogel formed from a reaction mixture comprising
- about 37 to about 75 wt % of a mixture of slow-reacting hydrophilic monomers, each having a slow-reacting hydrophilic monomer kinetic half life;
- said mixture of slow reacting hydrophilic monomers comprising at least one slow-reacting ionic monomer;
- at least one silicone-containing component having a silicone-containing component kinetic half life, which may be optionally substituted with at least one hydroxyl containing group;
- and
- at least one hydroxyl-containing component selected from said silicone-containing components substituted with at least one hydroxyl containing group, at least one hydroxyalkyl monomer, and mixtures thereof,
- wherein ratio of each of said slow-reacting hydrophilic component half lives to said silicone-containing component half life is at least 2.
Dependencies are inferred from the claim text.