Method for preparing ultraviolet radiation absorbing contact lenses
US5681871A · kind A · utility
110Cited by
17References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 24, 1995 |
| Grant date | Oct 28, 1997 |
| Priority date | — |
| Expiry date | May 24, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2810/30
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a process for producing an ultraviolet radiation absorbing contact lens from a lens shaped polymer having hydroxyl groups pendant therefrom and having dispersed therein a UV absorbing agent substituted with at least one anhydride group which is exposed to basic conditions such that the hydroxyl groups react with the anhydride groups on the UV absorbing agent. As a result the UV absorbing agent becomes fixed to the polymer through the formation of a covalent ester bond.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.