Process for producing soft contact lenses

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

G - Physics

02

C

18/106, 88/40, 4

G02C 7/04 (2006.01) B29D 11/00 (2006.01) G02B 1/04 (2006.01)

Patent

CA 1038524

ABSTRACT OF THE DISCLOSURE A soft contact lens having a water content of at least 45% and a tensile strength of at least 100 g/mm2 can be produced by pouring into a mold a com- position 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 alkyl acrylate or methacrylate, raising the temperature of the composition from 35°C to 110°C continuously to effect polymerization, processing the resulting formed product into a lens, and then swelling the lens thus obtained by hydration treat- meat including alkali treatment.

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