Hydrogel from ultraviolet-initiated copolymerization
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United States of America Patent
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Nov 4, 1986
Grant Date -
N/A
app pub date -
Jun 7, 1985
filing date -
Jun 7, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In the particular embodiment described in the specification, a contact lens hydrogel is prepared by copolymerizing 75 parts of N-vinyl pyrrolidone and 23 parts of phenyl ethyl methacrylate together with allyl methacrylate as a crosslinker, t-butyl peroctoate as a thermal initiator and 2,2-dimethoxy-2-phenylacetophenone or benzoin methyl ether as a photoinitiator. The mixture is maintained at a temperature of 5.degree. C. and protected from light prior to photopolymerization which is carried out under ultraviolet radiation. The copolymer is then post-cured thermally. Cloudy or hazy hydrogels are avoided by preventing prepolymerization of the mixture.
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