Essilor International

Corporation De L'ecole Polytechnique De Montreal

Sébastien Chiarotto

Karin Scherer

Ludvik Martinu

Oleg Zabeida

Nicolas Maitre

Stephanie Pega

Jolanta Klemberg-Sapieha

Martin Caron

Bruce Faure

Benoit Emprin

Jolanta Sapieha

Stéphanie Pega

The invention relates to an article comprising a substrate having at least one main surface coated with a layer L of a material M obtained by vacuum deposition, by co-evaporation, of at least one metallic compound A chosen from alkaline-earth metal fluorides and of at least one organic compound B, the material M having a refractive index at the wavelength of 632.8 nm ranging from 1.38 to 1.47. According to the invention:

Item comprising an organic-inorganic layer with a low refractive index

The invention relates to 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 (I) is higher than or equal to 1.5, and the optical article has a Bayer value determined in accordance with the ASTM F735-81 standard higher than or equal to 7.

Optical article having an interferential coating with an improved abrasion-resistance

The invention relates to an item comprising a substrate having at least one main surface coated with a multilayer interferential coating comprising at least one layer with a refractive index higher than 1.65 and at least one layer with a refractive index lower than, or equal to, 1.65, at least one of the layers of the interferential coating being an organic-inorganic layer that has been deposited in a vacuum environment and has a thickness of at least 30 nm, said interferential coating having a thickness of at least 450 nm and/or at least 8 layers.

Item having improved thermomechanical properties, comprising an organic-inorganic layer

The invention concerns an item comprising a substrate having at least one main surface coated with a layer A in direct contact with a hydrophobic outer layer B, characterized in that said layer A has been obtained by depositing, under ion beam, activated species from at least one compound C, in gas form, containing, in the structure of same: at least one carbon atom, at least one hydrogen atom, at least one Si&#x2014;X group, in which X is a hydroxy group or a hydrolysable group chosen from the H, halogen, alkoxy, aryloxy and acyloxy groups, &#x2014;NRRin which Rand Rseparately designate a hydrogen atom, an alkyl group or an aryl group, and &#x2014;N(R)&#x2014;Si in which Rdesignates an alkyl group or an aryl group, said compound C being neither tetramethyldisiloxane nor tetraethoxysilane, nor vinylmethyldiethoxysilane, nor hexamethylcyclotrisilazane, said layer A not being formed from inorganic precursor compounds.

Item coated with a silicon/organic layer improving the performances of an outer coating

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Charenton-le-Pont, France

Sébastien Chiarotto