Patent ID: 8552085
Filing Date: 2013-10-08
Classification: B29D,B29K,G02B,G02C

Abstract:
1. A method for producing a silicone hydrogel contact lens having an ophthalmically acceptable surface wettability, 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 silicon-containing component and a non-silicon containing component, the non-silicon containing- component comprising an N-vinyl pyrrolidone monomer, an N-vinyl-N-methyl acetamide monomer, an N-vinyl-N-ethyl acetamide monomer, an N-vinyl-N-ethyl formamide monomer, an N-vinyl formamide monomer, an N-2-hydroxyethyl vinyl carbamate monomer, or an N-carboxy-β-alanine N-vinyl ester monomer, or combinations thereof, and the contact lens mold comprising a first contact lens mold member and a second contact lens mold member assembled together; polymerizing the polymerizable silicone hydrogel lens precursor composition in the non-polar resin contact lens mold 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.