Process of manufacturing contact lenses in ambient environment

• Main Authors: ENNS JOHN B, KINDT-LARSEN TURE, CALVIN OLIN W
• Format: Patent
• Language: English
• Published: 05.06.2001
• Edition: 7
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; CONTACT LENSES; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; OPTICS; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICS; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; 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

A method of casting polymer contact lenses between two mold halves in an ambient (air) environment containing molecular oxygen (O2) in which the mold halves forming the cast geometry are exposed to the environment where the air exposure time, the time between which the injection mold used to form the mold halves is opened until the mold halves are assembled is less than 70 seconds, more preferably 40 seconds or less, and most preferably 24 seconds or less.