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1. (WO1999006199) PROCESS FOR PREPARING POLYVINYL ALCOHOL CONTACT LENSES

Pub. No.:    WO/1999/006199    International Application No.:    PCT/JP1998/003084
Publication Date: Fri Feb 12 00:59:59 CET 1999 International Filing Date: Fri Jul 10 01:59:59 CEST 1998
IPC: B29C 35/08
B29C 39/00
C08F 8/12
C08F 216/06
C08F 218/08
G02B 1/04
Applicants: SEED CO., LTD.

DEGAWA, Hiroki

IKEDA, Yuki

UNO, Kenji

Inventors: DEGAWA, Hiroki

IKEDA, Yuki

UNO, Kenji

Title: PROCESS FOR PREPARING POLYVINYL ALCOHOL CONTACT LENSES
Abstract:
A process for preparing cross-linked polyvinyl alcohol contact lenses through hydrolysis of a copolymer of a vinyl ester with triallyl isocyanurate, which comprises preparing a mixture of 100 parts by weight of a vinyl ester with 0.05 to 5 parts by weight of triallyl isocyanurate, filling the mixture into a mold composed of a male mold and a female mold, applying ultraviolet light to form a lenslike polymer, and hydrolyzing the resultant polymer. Since this process permits a lenslike polymer to be formed without resort to machining, the lens surfaces are not roughened and the shape stability of the lenses in a swollen state after the completion is so good that the handleability thereof is good and the lenses can be mass-prepared with a constant quality.