PRODUCTION OF CONTACT LENS IN ATMOSPHERE ENVIRONMENT

PROBLEM TO BE SOLVED: To embody a process for producing polymer contact lenses which is capable of producing the lenses having good quality even if the special gas environment is not used. SOLUTION: This process consists in cast molding the polymer contact lens between two half molds within the atmo...

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Bibliographic Details
Main Authors ENNS JOHN B, KINDT-LARSEN TURE, CALVIN OLIN W
Format Patent
LanguageEnglish
Published 11.08.2000
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:PROBLEM TO BE SOLVED: To embody a process for producing polymer contact lenses which is capable of producing the lenses having good quality even if the special gas environment is not used. SOLUTION: This process consists in cast molding the polymer contact lens between two half molds within the atmosphere (air) environment containing oxygen molecules. The half molds for shaping a molded shape are exposed to this environment. The air exposure time which is the time after opening of the injection molds used for production of the half molds to the assembly of the half molds is below 70 seconds, more preferably below 40 seconds and most preferably <=24 seconds.
Bibliography:Application Number: JP19990375243