Bleaching and dyeing; fluid treatment and chemical modification – Nontextile – dyeing process or product – including inorganic... – Contact lens
Patent
1992-04-24
1994-03-08
Skaling, Linda
Bleaching and dyeing; fluid treatment and chemical modification
Nontextile, dyeing process or product, including inorganic...
Contact lens
8509, 351160H, 351162, G02C 704, D06P 500
Patent
active
052923509
ABSTRACT:
An improved method is disclosed of imparting a tint or color to a soft, hydrogel contact lens by uniformly dispersing a dye throughout the lens. The dye is composed of a water-soluble compound essentially free of ethylenic unsaturation. A homogeneous solution of the dye in a hydrophilic monomer is prepared, the solution is subjected to polymerization conditions to yield a hydrophilic polymer from which the lens is formed, and the dye dispersed within the polymer is bonded to the polymer by contact with aqueous base prior to final hydration.
The finished lens does not require soaking in an aqueous solution of the dye to impart the desired tint or color to the lens. Additionally, the dye uniformly dispersed throughout the lens according to the improved method does not leach out of the lens or migrate within the lens.
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Ford James D.
Heaton John C.
Hill Gregory A.
Molock Frank F.
Rastrelli Edmund C.
Dusheck Caroline L.
Goodwin Matthew S.
Metz Charles J.
Skaling Linda
Vistakon, Inc.
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