Producing soft contact lenses
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United States of America Patent
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-
Aug 31, 1982
Issued Date -
N/A
app pub date -
Sep 25, 1980
filing date -
Sep 12, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A soft contact lens is provided by: pouring an excess amount of an original solution for producing a soft contact lens into a concave mold; placing a convex mold on said concave mold and overflowing the excess of said original solution to thereby uniformly fill said original solution in a space between said concave mold and said convex mold; gelling said original solution between the two molds to form therebetween a lens having a tensile strength of at least about 0.1 kgf/cm.sup.2 ; immersing said lens and said two molds in a liquid to peel said lens from said molds; and extracting the thus-peeled lens via an extraction treatment with water. The 'original solution' contains: a component A selected from the group consisting of monomers and hydrophillic polymers wherein the monomers yield hydrophillic component when polymerized; a compound B selected from the group consisting of monomers and hydrophobic polymers wherein the monomers yield hydrophobic component when polymerized; and a solvent C the weight ratio of A:B being from about 85:15 to about 55:45 and solvent C being about 5 to 95% by weight.
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