Tinted contact lens and method for preparation with dichlorotriazine reactive dye
AssigneeCooperVision, Inc.
InventorsJoseph W. Wittmann, John M. Evans
Life of this patent
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Abstract
Hydrophilic contact lenses comprised of a copolymer of an hydroxyl group-containing monomer and N-vinylpyrrolidone are tinted by impregnating the lens with an aqueous solution of a dichlorotriazine reactive dye and fixing the dye in the lens by contacting the lens with an aqueous alkaline solution.
Claims20
A process for coloring hydrophilic soft contact lenses comprised of a synthetic resin containing substantial proportions of an hydroxyl group-containing acrylic ester and N-vinylpyrrolidone comprising
- impregnating the lens with an aqueous solution of a dichlorotriazine dye, and
- contacting the impregnated lens with an aqueous alkaline solution for a period of time sufficient to fix the dye within the lens.
A hydrophilic soft contact lens comprised of a synthetic resin containing substantial proportions of an hydroxyl group-containing acrylic ester and N-vinylpyrrol-idone which has been tinted by a process comprising
- impregnating said lens with an aqueous solution of a dichlorotriazine dye, and
- contacting the impregnated lens with an aqueous alkaline solution for a period of time sufficient to fix the dye within the lens.
A tinted hydrophilic contact lens comprising an interpolymer hydrogel containing substantial proportions of residues of an hydroxyl group-containing monomer and vinylpyrrolidone residues and having a dichlorotriazine reactive dye bonded to the polymer through ether groups.
Dependencies are inferred from the claim text.