C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 1/00 (2006.01) C03C 17/25 (2006.01) G02B 1/11 (2006.01)
Patent
CA 2285944
The invention relates to an optical article which comprises a mineral substrate and an anti-reflecting coating on at least one surface of said mineral substrate. In a characteristic way, said mineral substrate has a refractive index between 1.5 and 1.9 and said anti-reflecting coating is a single layer, nanoporous/nanograin structured coating, obtained by heat- treating a sol-gel film, constituted of strongly interconnected, inorganic polymers, also linked with inorganic particles, said polymers forming a tri- dimensional network which has the general formula M-OH/M-O-M, in which M represents a metal or a metalloid, advantageously selected from silicon, aluminium, zirconium, titanium and mixtures thereof. The invention also relates to a sol-gel material which is precursor of said anti-reflecting coating, and to a coating method for obtaining said optical article. Said device is advantageously an ophthalmic lens.
Cet article optique est constitué d'un substrat minéral comportant sur l'une au moins de ses deux faces une couche antireflet. Normalement, l'indice de réfraction du substrat minéral se situe entre 1,5 et 1,9. Normalement également, la couche antireflet est une couche unique, à structure nanoporeuse ou nanogranuleuse, obtenue par traitement thermique d'un film sol-gel constitué de polymères inorganiques fortement interconnectés, et liés à des particules inorganiques. Ces polymères forment un réseau tridimensionnel de formule générale M-OH/M-O-M dans laquelle M représente un métal ou un métalloïde appartenant de préférence au groupe des silicium, aluminium, zirconium, titane, ou certains de leurs mélanges. L'invention concerne également, d'une part un matériau de type sol-gel qui est un précurseur de la couche antireflet considérée, et d'autre part une technique de traitement permettant d'aboutir à l'article optique considéré. Le dispositif considéré est de préférence un verre correcteur.
Corning Incorporated
Corning S.a.
Gowling Lafleur Henderson Llp
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