Method of dyeing or printing hydrogel resin

Details Method of dyeing or printing hydrogel resin Method of dyeing or printing hydrogel resin

D - Textiles, Paper

06

P

8/3, 88/40

D06P 1/22 (2006.01) B29D 11/00 (2006.01) G02B 1/04 (2006.01) G02C 7/02 (2006.01)

Patent

CA 1093763

Abstract of the Disclosure A method of dyeing or printing hydrogel resin which comprises the steps of impregnating hydrogel resin or a hydrophilic water- expansible high polymer with a water-soluble dyestuff or leuco or colorless compound thereof having a great affinity to said hydrogel resin; and treating said water-soluble dyestuff or leuco or color- less compound thereof to render them water insoluble and capable of presenting a color, said method being suitably applied in making a soft contact lens prepared from the hydrogel resin.

281252

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