METHOD FOR MOLDING LENS MATERIAL FOR EYE

PROBLEM TO BE SOLVED: To prevent the occurrence of a shrink mark by effectively introducing a monomer composition from a monomer reservoir into a molding cavity, and compensating for a polymerization shrinkage in the cavity. SOLUTION: As a mold, a mold having a monomer reservoir (having an intermedi...

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Hauptverfasser:	YASUDA AKIHIRO, YAMASHITA KEIJI, NIWA KAZUHARU, KOSHIO TATSUYA
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CONTACT LENSES OPTICS PERFORMING OPERATIONS PHYSICS PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE 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 TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To prevent the occurrence of a shrink mark by effectively introducing a monomer composition from a monomer reservoir into a molding cavity, and compensating for a polymerization shrinkage in the cavity. SOLUTION: As a mold, a mold having a monomer reservoir (having an intermediate chamber 20 and an external containing chamber 22) communicating with a molding cavity 24 is used. A monomer composition 30 is filled in the cavity 24 of the mold. Further, a pressure higher than an atmospheric pressure is operated at a liquid level of the composition 30 contained in the reservoirs 20, 22 in the state that the composition 30 is contained in the reservoirs 20, 22, and the composition 30 is polymerized at 10 to 80 deg.C.