Method for marking a water-absorptive contact lens: dyeing dry l

Details Method for marking a water-absorptive contact lens: dyeing dry l Method for marking a water-absorptive contact lens: dyeing dry l

1992-01-28

1993-09-14

Clingman, A. Lionel

Bleaching and dyeing; fluid treatment and chemical modification

Nontextile, dyeing process or product, including inorganic...

Contact lens

8650, 8651, 8653, D06P 500, D06P 300, G02C 704

Patent

active

052444708

ABSTRACT:
A method for tinting a water-absorptive contact lens to have a mark tinted thereon, which comprises superimposing on a water-absorptive contact lens in the dry state a screen provided with a tinting pattern corresponding to the mark to be tinted on the contact lens, applying to the contact lens through the tinting pattern of the screen a dye solution containing a vat dye and an alkaline reducing agent, followed by insolubilizing the vat dye.

REFERENCES:
patent: 4238524 (1980-12-01), La Liberte et al.
patent: 4494954 (1985-01-01), Suminoe et al.
patent: 4518390 (1985-05-01), Rabenau et al.
patent: 4777684 (1988-10-01), Johnson
patent: 4898695 (1990-02-01), Doshi
patent: 4981487 (1991-01-01), da Costa

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