US 12,092,908 B2
Optical article having an interferential coating with an improved abrasion-resistance
Benoit Emprin, Paris (FR); Nicolas Maitre, Conflans-Sainte-Honorine (FR); and Sébastien Chiarotto, Paris (FR)
Assigned to Essilor International, Charenton-le-Pont (FR)
Appl. No. 17/285,591
Filed by Essilor International, Charenton-le-Pont (FR)
PCT Filed Oct. 17, 2019, PCT No. PCT/EP2019/078299
§ 371(c)(1), (2) Date Apr. 15, 2021,
PCT Pub. No. WO2020/079197, PCT Pub. Date Apr. 23, 2020.
Claims priority of application No. 18306374 (EP), filed on Oct. 18, 2018.
Prior Publication US 2021/0397025 A1, Dec. 23, 2021
Int. Cl. B32B 7/023 (2019.01); G02C 7/02 (2006.01); G02C 7/10 (2006.01); C23C 14/08 (2006.01); G02B 1/115 (2015.01)
CPC G02C 7/107 (2013.01) [B32B 7/023 (2019.01); G02C 7/024 (2013.01); C23C 14/081 (2013.01); G02B 1/115 (2013.01); G02C 7/022 (2013.01)] 16 Claims
 
1. An optical article comprising a substrate having at least one main face successively coated with:
a layer comprising chromium, silicon and oxygen;
a monolayer sub-layer having a thickness higher than or equal to 100 nm;
a multilayer interferential coating comprising a stack of at least one high refractive index layer having a refractive index higher than 1.55 and at least one low refractive index layer having a refractive index of 1.55 or less, wherein the ratio:

OG Complex Work Unit Math
is higher than or equal to 1.7; and
wherein the optical article has a Bayer value determined in accordance with the ASTM F735-81 standard higher than or equal to 7.