Method for preparing a crosslinked graft copolymer of silicone and polyvinylpyrrolidone for use as a contact lens, and a contact lens produced thereby
US3959102A · kind A · utility
36Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 10, 1974 |
| Grant date | May 25, 1976 |
| Priority date | — |
| Expiry date | Oct 10, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S522/913
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An improved flexible contact lens is provided having hydrophilic and lipophobic properties which allow extended duration of wear by eliminating or greatly reducing the risk of rupture of the natural tear film produced by the cornea. These properties are achieved by crosslinking a selected water soluble polymer which has been grafted onto a pre-formed substrate, for example crosslinking polyvinyl pyrrolidone which has been previously grafted onto a silicone substrate. The grafting and the crosslinking are accomplished in separate stages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.