Cross-linked n-vinyl pyrrolidone polymer composition suitable for contact lenses
US3949021A · kind A · utility
22Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1974 |
| Grant date | Apr 6, 1976 |
| Priority date | — |
| Expiry date | Aug 7, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F291/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Contact lens having high water content make from polymer of cross-link-polymerized N-vinyl pyrrolidone in the presence of water-insoluble polymer has excellent properties suitable for continuous wearing for a long period of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.