Soft contact lenses and manufacture thereof

Details Soft contact lenses and manufacture thereof Soft contact lenses and manufacture thereof

C - Chemistry, Metallurgy

08

K

400/9209, 400/92

C08K 5/05 (2006.01) B29D 11/00 (2006.01) C08F 230/06 (2006.01) C08L 33/14 (2006.01) G02B 1/04 (2006.01)

Patent

CA 1213997

ABSTRACT OF THE DISCLOSURE Soft contact lenses are made by polymerizing a substantially anhydrous polymerization mixture containing a polymerizable, hydrophilic hydroxy ester of acrylic or methacrylic acid and a polyhydric alcohol, and a water displaceable ester of boric acid and a compound containing 3 or more hydroxyl groups so as to form a hydrophilic polymer containing at least 30% of said boric acid ester. In a preferred embodiment, the polymerization is effected in a mould cavity where the contact between a sharp circular edge in one mould part and a spherial surface in the other mould part defines the edge of the lens and the distance between the two mould surfaces outside the sharp edge increases in all radial directions away from the center.

401986

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