Process for making ophthalmic lenses

Details Process for making ophthalmic lenses Process for making ophthalmic lenses

B - Operations, Transporting

29

D

B29D 11/00 (2006.01) G02B 1/04 (2006.01)

Patent

CA 2647177

The present invention relates to aqueous processes for the production of silicone hydrogel contact lenses. The process comprises: (a) curing in a mold a reaction mixture comprising at least one silicone containing component wherein said reaction mixture is substantially free from sparingly water soluble components or impurities having a retention time, relative to TRIS of less than about 0.9 to form a lens; (b) contacting said lens and mold with an aqueous solution at a temperature less than 990C for less than about 1 hour, to release said lens from the mold and; (c) optionally post processing the lens, wherein said post processing, if conducted, is conducted with aqueous solutions for a time less than 6 hours.

La présente invention concerne des procédés aqueux de fabrication de lentilles de contact à base d'un hydrogel de silicone.

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