C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/12, 167/328,
C08F 220/54 (2006.01) A61L 26/00 (2006.01) A61L 27/00 (2006.01) A61L 27/16 (2006.01) A61L 27/52 (2006.01) C08F 220/22 (2006.01) G02B 1/04 (2006.01)
Patent
CA 1338363
This invention describes polymers which are obtained by copolymerization of 15-85 wt % N,N-dimethylacrylamide with about 15-85 % of a fluorinated monomer such as perfluoroalkyl-alkylene acrylate or -methacrylate with from 3 to 25 fluorine-atoms and optionally, 0-50 wt % other acrylates or methacrylates and 0-20 wt %, but not more than 5 mol % of a polyvinyl functional crosslinking agent. These polymers are machinable in the dry state and form clear hydrogels with about 25-75 wt % water content and which possess oxygen-permeabilities 3-7 times higher than conventional hydrogels of similar water content. In the absence of crosslinking, the novel polymers are plasticized by water, forming clear hydroplastics with 30-70 wt % water content. The crosslinked polymers are especially useful for fabricating contact lenses for extended wear by either cutting and polishing a xerogel button, or by spin casting or direct molding in bulk or in solution.
604473
Fetherstonhaugh & Co.
Novartis Ag
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