Near infrared light-cutting optical articles with low residual color
US11124599B2 · kind B2 · utility
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3References
16Claims
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Key dates
| Filing date | Oct 20, 2017 |
| Grant date | Sep 21, 2021 |
| Priority date | — |
| Expiry date | Dec 4, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K2201/014
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to an optical article having a substrate made of an optical material comprising a polymer matrix and at least one near infrared absorber, wherein TVIS is higher than or equal to 70%, TNIR is lower than or equal to 85%, TNIR and TVIS being respectively the average optical transmittance in the 780-1400 nm and in the 380-780 nm wavelength range for the optical material through a 2 mm thick layer of said optical material. This optical article can be used to protect from noxious infrared light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.