Tinted contact lenses and a method for their preparation
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 fluorotriazine dyestuff is covalently bonded external to the polymer backbone by reaction at temperatures up to 60°
- C. with hydroxyl, amino, amido or mercapto groups present in said polymer, over the colored portion of the lens.
1 Assignment
0 Petitions
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.
83 Citations
13 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 fluorotriazine dyestuff is covalently bonded external to the polymer backbone by reaction at temperatures up to 60°
- 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)
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7. A process for preparing a contact lens colored over at least a portion of its surface, comprising reacting at temperatures up to 60°
- C. at least one ractive fluorotriazine dyestuff 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 (8, 9, 10, 11, 12, 13)
Specification