Producing soft contact lenses

Details Producing soft contact lenses Producing soft contact lenses

1980-09-25

1982-08-31

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Changing mold size or shape during molding or with shrinkage...

264 11, 264 26, 425808, B29D 1100

Patent

active

043471986

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:

REFERENCES:
patent: 3660545 (1972-05-01), Wichterle
patent: 3894129 (1975-07-01), Hoffman et al.
patent: 3937680 (1976-02-01), de Carle
patent: 3949021 (1976-04-01), Kunitomo et al.
patent: 4113224 (1978-09-01), Clark et al.

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