Patent ID: 9187601
Filing Date: 2015-11-17
Classification: C08G,C08J,C08L,G02B

Abstract:
1. A water-processable prepolymer, comprising: (1) siloxane-containing monomeric units and/or polysiloxane-containing crosslinking units, wherein the siloxane-containing monomeric units are derived from one or more siloxane-containing vinylic monomers each having at least one hydrophilic polymeric chain with a molecular weight of up to about 10000 Daltons, wherein the polysiloxane-containing crosslinking units are derived from at least one hydrophilized polysiloxane crosslinker and/or chain-extended hydrophilized polysiloxane crosslinker each having one or more pendant hydrophilic polymeric chains; (2) hydrophilic monomeric units derived from one or more hydrophilic vinylic monomers; (3) from about 0.05% to about 5% by weight of polymerizable units each having a pendant or terminal, ethylenically-unsaturated group and free of any polysiloxane segment; and (4) optionally hydrophobic units derived from at least one hydrophobic vinylic monomer free of silicone, wherein the prepolymer comprises the polysiloxane-containing crosslinking units derived from a hydrophilized polysiloxane or chain-extended polysiloxane crosslinker of formula (7) or (8) In which e3, e4, e5, e6, e7, ν1, ν2, ν3, ν4, and ν5 independent of one other are 0, 1, 2 or 3 and (e3+e4+e5+e6+e7)≧1 and (ν1+ν2+ν3+ν4+ν5)≧1; X D in which Y L —Z B T wherein the prepolymer comprises from about 20% to about 50% by weight of silicone relative to the total weight of the prepolymer and has a high water solubility or dispersibility of at least about 5% by weight in water, wherein the prepolymer is capable of being actinically crosslinked, in the absence of one or more vinylic monomers, to form a silicone hydrogel contact lens having a water content of from about 20% to about 75% by weight when fully hydrated, an oxygen permeability (Dk) of at least about 40 barrers, and optionally a hydrophilic surface characterized by an average water contact angle of about 90 degrees or less without post-molding surface treatment.