Optical material comprising a red-shifted benzotriazole UV absorber
US10838111B2 · kind B2 · utility
1Cited by
2References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 21, 2017 |
| Grant date | Nov 17, 2020 |
| Priority date | — |
| Expiry date | Jul 31, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L75/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to an eyeglass lens comprising a substrate made of an optical material comprising a polymer matrix and at least one 2-(2-hydroxy-5-R1-phenyl)benzotriazole, in which R1 is a resonant group, the optical transmittance through a 2 mm thick layer of said optical material being lower than 1% for each light wavelength ranging from 280 to 405 nm. This eyeglass lens protects from phototoxic blue light and UV light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.