Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1989-05-23
1990-09-04
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526279, 526286, C08F 2022
Patent
active
049545876
ABSTRACT:
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.
REFERENCES:
patent: 4540761 (1985-09-01), Kawamura et al.
patent: 4735990 (1988-04-01), Kihara et al.
Ciba-Geigy Corporation
Hall Luther A. R.
Sarofin N.
Schofer Joseph L.
LandOfFree
Dimethylacrylamide-copolymer hydrogels with high oxygen permeabi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dimethylacrylamide-copolymer hydrogels with high oxygen permeabi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dimethylacrylamide-copolymer hydrogels with high oxygen permeabi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-442961