Patent ID: 9244197
Filing Date: 2016-01-26
CPC Classification: C08F,C08G,G02B

Claim Text:
1. A silicone hydrogel comprising a water content of at least about 50% and an oxygen permeability of at least about 80 barrers wherein said silicone hydrogel is formed from a reaction mixture comprising about 37 to about 75 wt % of at least one slow-reacting hydrophilic monomer having a slow-reacting hydrophilic monomer kinetic half life; 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; at least one hydroxyl-containing component selected from said silicone-containing components substituted with at least one hydroxyl group, at least one hydroxyalkyl monomer, and mixtures thereof, wherein ratio of said slow-reacting hydrophilic component half life to said silicone-containing component half life is at least 2, said reaction mixture comprising between 9 and 14 wt % silicon from all components and less than 15 wt % TRIS and wherein all reactive components other than said slow-reacting hydrophilic monomer and said silicone containing components in the reaction mixture are ancillary components and the hydroxyl containing components are present in an amount sufficient to provide a molar ratio of hydroxyl groups in the reaction mixture to silicon atom content between about 0.16 and about 0.4.