Water-based inks for hydrogel lenses

G - Physics – 02 – B

Patent

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Details

G02B 1/04 (2006.01) B29D 11/00 (2006.01) C08G 18/67 (2006.01) C08G 18/81 (2006.01) C09D 11/10 (2006.01) G02C 7/04 (2006.01)

Patent

CA 2574143

The present invention is related to water-based inks for making colored hydrogel contact lenses, in particular, colored HEMA-based hydrogel contact lenses. The ink of the invention comprises at least one colorant, water, and a water-soluble and actinically-curable binder polymer which is a vinyl group- terminated polyurethane polymer, a vinyl group-terminated polyurea binder polymer, or a mixture thereof. Also, the ink of the invention is characterized by having a viscosity greater than 50 centipoise (cps), a prolonged stability, and a good adhesion to a HEMA-based hydrogel contact lens. The ink of the invention preferably further has a good compatibility with a HEMA-based hydrogel material, and/or good transferability from a mold to a HEMA-based hydrogel contact lens made in the mold. The present invention is also related to a method for making colored hydrogel contact lenses using an ink of the invention.

L'invention concerne des encres aqueuses destinées à la fabrication de lentilles de contact hydrogel colorées, en particulier de lentilles de contact hydrogel colorées à base d'hydroxyléthylméthacrylate (HEMA). L'encre selon l'invention contient au moins un colorant, de l'eau, un polymère liant hydrosoluble pouvant être durci par rayonnement actinique, se présentant sous la forme d'un polymère de polyuréthane à terminaison vinyle, un polymère liant de polyurée à terminaison vinyle ou un mélange de ceux-ci. L'encre selon l'invention est caractérisée par une viscosité supérieure à 50 centipoise (cP), une stabilité prolongée et une bonne adhérence à une lentille de contact hydrogel à base de HEMA. L'encre selon l'invention présente par ailleurs une bonne compatibilité avec des matériaux hydrogel à base de HEMA et/ou un bon pouvoir de transfert d'un moule vers une lentille de contact hydrogel à base de HEMA. La présente invention concerne également un procédé de fabrication de lentilles de contact hydrogel colorées au moyen d'une encre selon l'invention.

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