Back to results
US 7,887,882 B2Granted
Stabilized ultra-violet absorbers
AssigneeEssilor International (Compagnie Generale d'Optique)
InventorsIvan M. Nunez, Venkat Sekharipuram, Scott J. Carlesco, Michele L. Alron
Life of this patent
Estimating the term…
Abstract
The invention provides UV absorber solutions that do not require use of a solvent to prevent formation of insoluble reaction products. The invention is useful in the manufacture of ocular devices including spectacle, contact and intraocular lenses, but may find its greatest utility in the manufacture of spectacle lenses.
Claims6
A method for producing an ocular device comprising an ultraviolet absorber, wherein the method comprises
- providing an aqueous composition consisting essentially of
- from 0.5 percent to 20 percent of a water-soluble ultraviolet absorber selected from the group consisting of benzophenones, benzotriazoles, triazines, substituted acrylonitriles, salicylic acid derivatives, benzoic acid derivatives, cinnamic acid derivatives, chalcone derivatives, dypnone derivatives, crotonic acid derivatives, diphenyl acrylates, and mixtures thereof,
- from 0.5 percent to 1 percent of a water-soluble antioxidant that is citric acid in the form of lemon juice concentrate, and
- water,
- heating the aqueous composition until complete dissolution of all components,
- applying the aqueous composition onto the ocular device by using a dipping technique.
3 more elements
A method for producing an ocular device comprising an ultraviolet absorber, wherein the method comprises
- providing an aqueous composition consisting essentially of
- from 0.5 percent to 20 percent of a water-soluble ultraviolet absorber selected from the group consisting of benzophenones, benzotriazoles, triazines, substituted acrylonitriles, salicylic acid derivatives, benzoic acid derivatives, cinnamic acid derivatives, chalcone derivatives, dypnone derivatives, crotonic acid derivatives, diphenyl acrylates, and mixtures thereof,
- from 0.5 percent to 1 percent of a water-soluble antioxidant that is citric acid in the form of lemon juice concentrate, and
- water,
- heating the aqueous composition to a temperature of about 80 to 96 degrees Celsius until complete dissolution of all components so as to obtain an aqueous bath containing the ultraviolet absorber,
- soaking the ocular device in said aqueous bath while maintaining the aqueous bath at a temperature of about 80 to 96 degrees Celsius,
- removing the ocular device from said aqueous bath, and
- rinsing the ocular device.
5 more elements
Dependencies are inferred from the claim text.