Blue light cutting optical material comprising a benzotriazole UV absorber
US10308618B2 · kind B2 · utility
1Cited by
2References
16Claims
0Family size
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Key dates
| Filing date | Feb 7, 2017 |
| Grant date | Jun 4, 2019 |
| Priority date | — |
| Expiry date | Feb 7, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/223
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Optical material comprising a polymer matrix and at least one benzotriazole compound having at least one ester group, wherein said at least one benzotriazole is a chlorobenzotriazole compound that does not comprise any polymerizable group selected from allylic, acrylic and methacrylic moieties, or the optical transmittance through a 2 mm thick layer of said optical material is lower than 1% for each light wavelength ranging from 280 to 400 nm, and higher than 65% for light having a wavelength of 430 nm. This optical material can be used to protect from phototoxic blue light and UV light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.