Polymethylmethacrylate cellulosic copolymer lens material
AssigneeNeefe Optical Laboratory, Inc.
InventorCharles W. Neefe
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Abstract
A gas permeable dimensionally stable contact lens material which is a transparent, optically clear methylmethacrylate cellulosic copolymer.
Claims6
A gas permeable, dimensionally stable, optically clear contact lens material made by the steps of dissolving in monomeric methylmethacrylate 2% to 80% by weight of the methylmethacrylate of a soluble solid cellulose ether or ester polymer material which does not prevent the polymerization of the monomeric methylmethacrylate, polymerizing the methylmethacrylate cellulosic solution to form a ridged transparent contact lens material which has a faster recovery from being flexed than a polymethylmethacrylate or a cellulosic contact lens material.
A material as in cliam 1 wherein the soluble cellulosic material is Cellulose Nitrate.
Dependencies are inferred from the claim text.