Hydrogel contact lenses for extended wear

Details Hydrogel contact lenses for extended wear Hydrogel contact lenses for extended wear

C - Chemistry, Metallurgy

08

F

88/40

C08F 226/10 (2006.01) B29D 11/00 (2006.01) C08F 220/18 (2006.01) G02B 1/04 (2006.01)

Patent

CA 1251069

Abstract Hydrogel Contact Lenses For Permanent Wear A process is disclosed for the preparation of hydrogel contact lenses having improved mechanical properties, said process comprising polymerizing, in the presence of an azo type initiator, a monomer mixture comprising from 25% to 50% by weight of N-vinyl pyrrolidone, up to 5% by weight of methacrylic ar acrylic acid, 0.1 to 1% by weight of 1,3,5-tris(propenoxy)-2,4,6- triazine (TPT), or perhydro-2,4,6,-triketo-1,3 5,- tris(propene-2)-1,3,5 triazine (TTPT), as a cross-linking monomer, the balance being essentially hydroxy alkyl acrylate or methacrylate, wherein the alkyl group is ethyl or propyl.

453077

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