Hydrophilic reflective article

C - Chemistry – Metallurgy – 03 – C

Patent

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Details

C03C 17/34 (2006.01) B60R 1/02 (2006.01) G02B 1/00 (2006.01) G02B 5/08 (2006.01)

Patent

CA 2502224

The invention relates to a composite article, in particular a rear-view mirror for a motor vehicle, comprising a substrate (10), generally made of glass, a reflective layer (20) composed of an oxidised or nitrided metal, possibly in an under-stoichiometric state, disposed on the front face (Figure 1) or on the rear face (Figure 2). The coating stack on the front face comprises a generally titanium dioxide-based layer (40) having photocatalytic properties, possibly covered by a fine hydrophilic layer (50), in particular composed of silicon oxide. The coating stack possibly comprises a barrier sub-layer (30). The article according to the invention advantageously has an attenuated reflection which can vary between 40 and 75 %.

La présente invention concerne un article composite, en particulier un rétroviseur d'un véhicule automobile, comprenant un substrat (10) le plus souvent composé de verre, une couche réfléchissante (20) composée d'un métal oxydé ou nitruré, éventuellement dans un état sous-stoechiométrique, disposée sur la surface avant ou sur la surface arrière. L'empilement de revêtements formé sur la surface avant comprend une couche généralement à base de dioxyde de titane (40) présentant des propriétés photocatalytiques éventuellement recouverte d'une fine couche hydrophile (50) composée en particulier d'oxyde de silicium. Cet empilement de revêtements comprend éventuellement une sous-couche barrière (30). L'article de cette invention présente l'avantage d'atténuer la réflexion, qui peut varier entre 40 et 75 %.

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