Patent ID: 9272473
Filing Date: 2016-03-01
CPC Classification: B29D,B29K,G02B,G02C

Claim Text:
1. A method for producing a silicone hydrogel contact lens, comprising: providing a polymerizable silicone hydrogel lens precursor composition in a contact lens shaped cavity of a non-polar resin contact lens mold, the polymerizable silicone hydrogel precursor composition comprising a silicone-containing component and a non-silicone containing component, the non-silicone containing component being present in an amount between about 10% to about 60% (w/w) based upon the weight of all reactive components of the precursor composition and said non-silicone containing component comprising an N-vinyl pyrrolidone (NVP) monomer and a N,N-dimethylacrylamide (DMA) monomer, and the contact lens mold comprising a first contact lens mold member and a second contact lens mold member; polymerizing the polymerizable silicone hydrogel lens precursor composition in the non-polar resin contact lens mold using heat or ultraviolet light to form a pre-extracted polymerized silicone hydrogel contact lens product having a dry weight, the pre-extracted silicone hydrogel contact lens product having a removable monomeric component in an amount of at least 10% (w/w) based on the dry weight of the pre-extracted polymerized silicone hydrogel contact lens product; extracting and hydrating the pre-extracted polymerized silicone hydrogel contact lens product by contacting the pre-extracted polymerized silicone hydrogel contact lens product with an extraction media to produce a silicone hydrogel contact lens having a dry weight no greater than 90% of the dry weight of the pre-extracted polymerized silicone hydrogel contact lens product; and packaging the silicone hydrogel contact lens in a contact lens package, wherein the silicone hydrogel contact lens has an advancing contact angle less than about 120 degrees, a tensile modulus less than about 1.6 MPa, an oxygen permeability of at least about 70 barrers, and a water content of at least about 30% by weight.