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US 5,516,467 AGranted
Process for producing a tinted contact lens
AssigneeMenicon Co., Ltd.
InventorsKazuharu Niwa, Yoshitaka Taniyama, Noriko Iwata, Yasuhiro Yokoyama
Life of this patent
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Abstract
A process for producing a tinted contact lens, which includes dissolving a soluble vat dye in a monomer capable of dissolving the soluble vat dye therein, mixing the monomer having the soluble vat dye dissolved therein and other monomers, polymerizing the monomer mixture and processing the resulting polymer into a shape of a contact lens.
Claims10
A process for producing a tinted contact lens, which comprises:
- (a) dissolving a solubilised vat dye in one or more monomers capable of dissolving the solubilised vat dye therein, said one or more monomers comprising, at least, N,N,-dimethyl acrylamide or N,N-dimethyl(meth)acrylamide;
- (b) mixing the one or more monomers having said solubilised vat dye dissolved therein and other monomers;
- (c) polymerizing the monomer mixture;
- and
- (d) processing the resulting polymer into a shape of a contact lens.
2 more elements
Dependencies are inferred from the claim text.