Hydrogel from ultraviolet-initiated copolymerization

Details Hydrogel from ultraviolet-initiated copolymerization Hydrogel from ultraviolet-initiated copolymerization

1985-06-07

1986-11-04

Michl, Paul R.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Utilizing plasma, electric, electromagnetic, particulate, or...

264 11, 522 13, 523108, 526264, C08J 300

Patent

active

046209549

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.

REFERENCES:
patent: 3772235 (1973-11-01), Stamberger
patent: 3839304 (1974-10-01), Hovey
patent: 4022754 (1977-05-01), Howes
patent: 4073577 (1978-02-01), Hofer
patent: 4433111 (1984-02-01), Tighe
patent: 4492776 (1985-01-01), Atkinson

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