Process for preparing polyvinyl alcohol contact lenses
US6402995B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 2000 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Jan 28, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2810/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing crosslinked polyvinyl alcohol contact lenses through hydrolysis of a copolymer of a vinyl ester with triallyl isocyanurate, which includes preparing a mixture of 100 parts by weight of the vinyl ester with 0.05 to 5 parts by weight of the triallyl isocyanurate, filling a mold composed of a male mold and a female mold with the mixture, applying ultraviolet ray to form a lens-shaped polymer, and hydrolyzing the resultant polymer. Since this process has a lens-shaped polymer formed without machinery processings, the lens surface is not roughened and the shape stability of the completed lens in a swollen state is so good that the handleability thereof is good and the lens can be mass-prepared with equalized quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.