D - Textiles – Paper – 06 – P
Patent
D - Textiles, Paper
06
P
D06P 5/00 (2006.01) C08F 2/44 (2006.01) C09B 9/00 (2006.01) D06P 1/00 (2006.01) D06P 1/28 (2006.01) D06P 1/52 (2006.01) D06P 1/92 (2006.01) D06P 3/00 (2006.01) D06P 3/34 (2006.01) G02B 1/04 (2006.01)
Patent
CA 2190153
Disclosed are processes for tinting hydrogel materials, such as contact lenses, by dissolving a leuco sulfate ester of a vat dye in a compatible monomer solution, adding an oxidizing initiator to the monomer solution, and oxidizing and polymerizing the monomer solution and dye in the same solution. In one aspect, the oxidation and polymerization are conducted simultaneously whereas in another embodiment the oxidation of the soluble leuco sulfate ester of a vat dye to the insoluble vat dye and polymerization are conducted sequentially in the same reaction medium.
L'invention se rapporte à des procédés de nuançage de matériaux hydrogels, tels que des lentilles de contact, qui consistent à dissoudre un leuco sulfate ester d'un colorant de cuve dans une solution monomère compatible, et à oxyder et polymériser la solution monomère et le colorant dans cette même solution. Selon un aspect de l'invention, l'oxydation et la polymérisation sont effectuées simultanément alors que, selon un autre mode de réalisation, l'oxydation du leuco sulfate ester soluble d'un colorant de cuve en un colorant de cuve insoluble et la polymérisation sont effectuées de manière séquentielle dans le même milieu de réaction.
Fetherstonhaugh & Co.
Pbh Inc.
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