Continuous wear hydratable, boilable methylmethacrylate copolymer contact lens
OwnerCharles W. Neefeinventor
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Abstract
A gas permeable continuous wear contact lens material made by copolymerizing methylmethacrylate, N-(1,1-dimethyl-3-oxobutyl) acrylamide, propylene glycol monomethacrylate and methacrylic acid to form a hard solid contact lens material which may be made soft and hydrophilic by placing the lens in an alkaline solution and may be sterilized by boiling.
Claims6
A material for making flexable, nonelastic, oxygen permeable contact lenses having an oxygen equivalent of 7.8% at a thickness of 0.20 milimeter which may be sterilized by heat or chemicals, made of a copolymer comprising, 100 parts by weight methylmethacrylate monomer copolymerized with from 1 to 50 parts by weight of N-(1,1-dimethyl-3-oxobutyl) acrylamide monomer and 2 to 30 parts by weight methacrylic acid and 1 to 20 parts by weight propylene glycol monomethacrylate.
Dependencies are inferred from the claim text.