Copolymer

Details Copolymer Copolymer

C - Chemistry, Metallurgy

08

F

88/40, 402/403

C08F 220/10 (2006.01) C08F 220/28 (2006.01) C08F 226/06 (2006.01) C08J 3/24 (2006.01) G02B 1/04 (2006.01)

Patent

CA 1052945

ABSTRACT Water-swellable lightly cross-linked copolymers, specifically terpolymers, between 3-methoxy-2-hydroxy-propyl methacrylate (G-MEMA), at least one N-vinyl lactam and at least one copolymerizable monomer to increase strength and stiffness, have utility as contact lenses. Preferred examples contain methyl methacrylate (MMA) and vinylpyrrolidone (VP) as comonomers, and up to 5% e.g. 2% of a cross-linking agent, preferably with non-equivalent functional groups such as allyl methacrylate. Preferably the water content is up to 65% based on total gel, e.g. 50-60% by weight; the VP:MMA ratio is from 50:50 to 70:30 and from 10-75% by weight G-MEMA units are present.

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