Production of borate crosslinked polyvinyl alcohol contact lenses
US4559186A · kind A · utility
19Cited by
5References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 23, 1984 |
| Grant date | Dec 17, 1985 |
| Priority date | — |
| Expiry date | Jul 23, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B1/043
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Soft contact lenses of polyvinyl alcohol having a weight average molecular weight of at least about 6,000, crosslinked with borate in an effective amount, to increase the elastic modulus thereof, said lenses being substantially insoluble in the ocular tear fluid environment, and methods for their preparation are disclosed. These materials are characterized by their high water content, high dissolved oxygen permeability, high optical clarity and especially their superior mechanical strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.