Method for making silicone hydrogel contact lenses
US8506856B2 · kind B2 · utility
0Cited by
29References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2008 |
| Grant date | Aug 13, 2013 |
| Priority date | — |
| Expiry date | Dec 26, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29D11/00038
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The invention provides a method for making silicone hydrogel contact lenses. The method of the invention is characterized by using a solvent mixture including at least one organic solvent which dissolves the polymerizable material in a lens-forming composition and a small amount of water. By having a small amount of water in the lens-forming composition, the mechanical strength of lenses cast-molded from the lens-forming composition can be sufficiently high so that the lenses can survives during mold opening and demolding process, thereby increasing the production yield.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.