Silicone hydrogel contact lenses having non-uniform morphology
US11578176B2 · kind B2 · utility
1Cited by
99References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 15, 2020 |
| Grant date | Feb 14, 2023 |
| Priority date | — |
| Expiry date | Jan 27, 2041 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2203/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Described is a silicone hydrogel contact lens having non-uniform morphology. The contact lens may be made from a reactive mixture comprising: a silicone-containing component; a hydrophilic component; a non-reactive polymeric internal wetting agent; and a polymerization initiator, the contact lens having an oxygen permeability of at least about 60 barrers, and wherein the molar ratio in the lens of the polymeric non-reactive internal wetting agent to silicone, without a surface treatment, is greater in the lens's surface than in its bulk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.