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US 2004/0012757 A1Published application
Method for preparing the reactive tinting compound and the tinted contact lens
OwnerShinn-Gwo Honginventor
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OwnerShinn-Gwo Honginventor
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A method for preparing the tinted contact lens with the covalently bonded novel reactive tinting compound is disclosed. The reactive tinting compound with mono vinyl functionality is prepared by reacting the reactive dye with a hydrophilic monomer containing both pendent hydroxyl and vinyl groups under an alkaline condition. The water soluble reactive dyes containing either difluoro-chloropyrimidine or β-sulphatoethylsulphone reactive groups are used for synthesis of the reactive tinting dye. The lens forming materials is photo-polymerized in the presence of the reactive tinting compound to prepare a tinted contact lens. The reactive tinting compound is copolymerized with the lens forming monomers in a single photo-polymerization step that required no subsequently alkaline soaking or developing step as used in the prior art. In addition, the covalently bonded dye is stable and durable in the lens and does not fade or leach out after multiple high-pressure thermal sterilization.
A method for preparing a reactive tinting compound for tinted contact lens comprising the step of:
A reactive tinting compound which is prepared by the steps comprising
A tinted contact lens comprising a hydrophilic monomer material, an inert diluent, an acrylic crosslinker with multiple unsaturated vinyl groups and a reactive tinting compound which is prepared by the steps comprising
Dependencies are inferred from the claim text.