Method for tinting a hydrophilic polymer

Details Method for tinting a hydrophilic polymer Method for tinting a hydrophilic polymer

D - Textiles, Paper

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D06P 5/00 (2006.01) B29D 11/00 (2006.01) D06P 1/52 (2006.01) D06P 1/673 (2006.01) D06P 3/34 (2006.01) G02C 7/02 (2006.01) G02C 7/04 (2006.01)

Patent

CA 2098822

A hydrophilic polymer, e.g., provided as a contact lens, is tinted by a method which incorporates a reactive dye into the po- lymer during formation of the latter. Following physical entrainment of the reactive dye in the polymer, the polymer is contacted with an aqueous solution of a base which catalyzes the reaction of the dye with the polymer. In this way, the dye becomes perma- nently covalently bound to the polymer.

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