PROCESS OF MANUFACTURING CONTACT LENSES IN AMBIENT ENVIRONMENT

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 th...

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Bibliographic Details
Main Authors JOHN B. ENNS, OLIN W. CALVIN, TURE KINDT-LARSEN
Format Patent
LanguageEnglish
Published 18.02.2003
Edition7
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
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Summary: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.
Bibliography:Application Number: SG19990006623