Tinted contact lenses and a method for their preparation with reactive dyes
First Claim
1. A contact lens colored over at least a portion of its surface, comprising a copolymeric hydrogel material to which at least one reactive dyestuff of the formula ##STR11## wherein D is the radical of an organic dyestuff radical;
- R is a divalent organic electron attracting group capable of causing electron withdrawal of the C carbon atoms, thus activating the same;
X is hydrogen or halo; and
Y is leaving group;
or mixtures thereof, is covalently bonded external to the polymer backbone by reaction at temperatures up to 40°
C. with hydroxyl, amino, amido or mercapto groups present in said polymer, over the colored portion of the lens.
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Accused Products
Abstract
Contact lenses comprising polymeric lens materials in which reactive dyestuffs have been covalently bonded to monomer units of the polymer backbone, said reactive dyestuffs being reactive dyes capable of forming ether linkages with cellulose and reactive with hydroxyl, amino, amido or mercapto groups present in a hydrogel polymer to form the covalent bond therewith. The invention is of particular interest in the area of so-called hydrophilic or "soft" contact lenses, commonly referred to as hydrogel lenses.
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Citations
14 Claims
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1. A contact lens colored over at least a portion of its surface, comprising a copolymeric hydrogel material to which at least one reactive dyestuff of the formula ##STR11## wherein D is the radical of an organic dyestuff radical;
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R is a divalent organic electron attracting group capable of causing electron withdrawal of the C carbon atoms, thus activating the same; X is hydrogen or halo; and Y is leaving group; or mixtures thereof, is covalently bonded external to the polymer backbone by reaction at temperatures up to 40°
C. with hydroxyl, amino, amido or mercapto groups present in said polymer, over the colored portion of the lens. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A process for preparing a contact lens colored over at least a portion of its surface, comprising reacting at temperatures up to 40°
- C. at least one reactive dyestuff of the formula ##STR13## wherein D is the radical of an organic dyestuff radical;
R is a divalent organic electron attracting group capable of causing electron withdrawal of the C carbon atoms, thus activating the same; X is hydrogen or halo; and Y is a leaving group; or mixtures thereof with hydroxyl, amino, amido or mercapto groups present in the polymeric hydrogel contact lens material, and removing unreacted dyestuff from said lens material. - View Dependent Claims (9, 10, 11, 12, 13, 14)
- C. at least one reactive dyestuff of the formula ##STR13## wherein D is the radical of an organic dyestuff radical;
Specification