METHOD OF INCREASING THE CONCENTRATION OF RADIATION-ABSORBING AGENTS IN OPTICAL AND OPHTHALMIC LENSES

• Main Authors: JANSSEN, ROBERT, ALLEN, MULCAHY, DEBORAH, JEAN, PEEPLES, JUDY, LAVERNE, STEBBINS, LESLIE, FRANK, COOPER, CHARLOTTE, LYNN
• Format: Patent
• Language: English; French
• Published: 30.11.1995
• Edition: 6
• Subjects: ADHESIVES; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; CONTACT LENSES; DYES; GENERAL PROCESSES OF COMPOUNDING; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PERFORMING OPERATIONS; PHYSICS; POLISHES; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURESAS SPECTACLES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

A method and composition useful in fabricating radiation-absorbing contact lenses, especially ultraviolet (UV) and visible (tint) light-absorbing lenses. The radiation-absorber is incorporated into a contact lens in the presence of a buffer which maintains the pH near neutral. Subsequently, the radiation-absorber is chemically affixed to the lens by raising the pH to a highly basic level. L'invention concerne un procédé et une composition utiles dans la fabrication de lentilles de contact absorbant les rayonnements, en particulier la lumière ultraviolette (UV) et la lumière visible (lentilles teintées). L'agent absorbant le rayonnement est incorporé dans une lentille de contact en présence d'un tampon qui maintient le pH proche de la neutralité. Ensuite, l'agent absorbant le rayonnement est fixé chimiquement à la lentille, par augmentation du pH jusqu'à une valeur fortement basique.