Process for producing soft contact lenses

Details Process for producing soft contact lenses Process for producing soft contact lenses

1975-02-06

1976-10-26

Bleutge, John C.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

260 297T, 260 775UA, 264 1, 526160, 526320, 526328, 516318, C08F 1824, C08F21602, B29D 1100

Patent

active

039882748

ABSTRACT:
A soft contact lens having a water content of at least 45% and a tensile strength of at least 100 g/mm.sup.2 can be produced by pouring into a mold a composition consisting of 70 to 93% by weight of an alkylene glycol monoacrylate or monomethacrylate, 0.3 to 2.0% by weight of a polyfunctional monomer, 1 to 10% by weight of a monomer having at least one carboxyl group in its molecule and 5 to 20% by weight of an acrylic or methacrylic acid derivative, raising the temperature of the composition from 35.degree. C to 110.degree. C continuously to effect polymerization, processing the resulting formed product into a lens, and then swelling the lens thus obtained by hydration treatment including alkali treatment.

REFERENCES:
patent: 2998414 (1961-08-01), West et al.
patent: 3503942 (1970-03-01), Seiderman
patent: 3598770 (1971-08-01), Moore et al.
patent: 3699089 (1972-10-01), Wichterle
patent: 3728315 (1973-04-01), Gustafson
patent: 3803093 (1974-04-01), Neefe
patent: 3807398 (1974-04-01), Grucza
patent: 3822089 (1974-07-01), Wichterle
patent: 3880818 (1975-04-01), Shen et al.

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