Invention Grant
- Patent Title: Blue light cutting optical material having a bluish appearance
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Application No.: US17051863Application Date: 2019-04-29
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Publication No.: US11774636B2Publication Date: 2023-10-03
- Inventor: Pierre Fromentin , Armel Jimenez , Waranya Phompan
- Applicant: Essilor International
- Applicant Address: FR Charenton-le-Pont
- Assignee: Essilor International
- Current Assignee: Essilor International
- Current Assignee Address: FR Charenton-le-Pont
- Agency: Norton Rose Fulbright US LLP
- Priority: EP 315009 2018.04.30
- International Application: PCT/EP2019/060930 2019.04.29
- International Announcement: WO2019/211242A 2019.11.07
- Date entered country: 2020-10-30
- Main IPC: G02B1/04
- IPC: G02B1/04 ; C08G18/24 ; C08G18/38 ; G02C7/04

Abstract:
The present invention relates to an optical material cutting blue light, comprising at least one UV absorber that at least partially blocks light having a wavelength ranging from 400 to 450 nm, at least one absorbing dye A having its maximum absorption wavelength in the range from 520 nm to 640 nm, the optical material being made of a material chosen from polythiourethane materials, polyurethane urea materials, materials resulting from the polymerization or copolymerization of polyepisulfide monomers or oligomers, and materials resulting from the polymerization or copolymerization of allylic monomers or oligomers, the optical material having a colorimetric coefficient b* as defined in the CIE (1976) L*a*b* international colorimetric system that is lower than or equal to 6, and a hue angle h higher than or equal to 120° and lower than or equal to 180°, for an optical material thickness of 2 mm.
Public/Granted literature
- US20210116604A1 Blue Light Cutting Optical Material Having a Bluish Appearance Public/Granted day:2021-04-22
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