Dimethylacrylamide-copolymer hydrogels with high oxygen permeabi

Details Dimethylacrylamide-copolymer hydrogels with high oxygen permeabi Dimethylacrylamide-copolymer hydrogels with high oxygen permeabi

1990-07-06

1991-04-30

Schofer, Joseph L.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

623 6, 604289, 6048901, 128155, G02C 704

Patent

active

050112759

ABSTRACT:
The 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.

REFERENCES:
patent: 2834763 (1958-05-01), Halpern et al.
patent: 3118161 (1963-03-01), Cramton
patent: 3403070 (1964-01-01), Lewis, Jr.
patent: 3411979 (1965-08-01), Lewis, Jr.
patent: 4010308 (1975-06-01), Wiczer

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