Soft contact lenses and process for preparation thereof
US3983083A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Dec 6, 1974 |
| Grant date | Sep 28, 1976 |
| Priority date | — |
| Expiry date | Dec 6, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/936
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Soft contact lenses comprising a copolymer comprising at least one monomer of the general formula, ##EQU1## wherein X is H or CH.sub.3 and n is 2 or 3, at least one monomer of the general formula, ##EQU2## wherein X is H or CH.sub.3 and m is an integer of 4 to 13, and optionally at least one polymerizable monomer other than the monomers of the above-mentioned two groups are disclosed. These contact lenses are soft and flexible in the non-swollen state and are tougher and less susceptible to microbiological contamination than the hitherto known soft contact lenses. Also a novel process for preparation of these soft contact lenses is disclosed, which comprises cast-polymerizing a mixture of the above-mentioned monomers, cooling the resulting copolymer to a low temperature at which it stands rigid, and shaping the copolymer body into the lens form in the cooled rigid state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.