Actinically-crosslinkable siloxane-containing copolymers

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 283/12 (2006.01) B29D 11/00 (2006.01) C08F 290/06 (2006.01) G02B 1/04 (2006.01)

Patent

CA 2760747

The invention provide a class of actinically-crosslinkable silicone-containing prepolymers which comprise dangling polysiloxane chains each having a terminal ethylenically-unsaturated group and are obtained in a one-step of RAFT polymerization of a reactive mixture comprising a polysiloxane crosslinker, a hydrophilic vinylic monomer, a RAFT agent, and a free-radical initiator. The present invention is also related to silicone hydrogel contact lenses made from a prepolymer of the invention and methods for making the contact lenses in a cost-effective way and with high consistency and high fidelity to the original lens design.

L'invention porte sur une classe de prépolymères contenant du silicone réticulable par voie actinique qui comprennent des chaînes de polysiloxane pendantes ayant chacune un groupe terminal à insaturation éthylénique et qui sont obtenus dans une polymérisation RAFT en une étape d'un mélange réactionnel comprenant un agent de réticulation polysiloxane, un monomère vinylique hydrophile, un agent de RAFT et un initiateur de radicaux libres. La présente invention porte également sur des lentilles de contact en hydrogel de silicone fabriquées à partir d'un prépolymère de l'invention et sur des procédés pour la fabrication des lentilles de contact d'une manière économique et avec une uniformité élevée et une fidélité élevée au modèle de lentille d'origine.

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