Photochromic naphthopyran compositions of neutral color

C - Chemistry – Metallurgy – 09 – K

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C09K 9/02 (2006.01) G02B 5/23 (2006.01)

Patent

CA 2248117

Described are novel compositions of a carrier and at least two photochromic naphthopyran compounds, selected on the basis of specific criteria, that when exposed to solar ultraviolet radiation, exhibit neutral colors of gray or brown contained within the a* and b* ranges of +10 to -10 in the CIELAB color system. Also described are carriers, i.e., organic solvents and organic polymeric host materials, such as optically clear articles, e.g., ophthalmic lenses or other plastic transparencies that contain or that are coated with the naphthopyran compounds.

On décrit de nouvelles compositions d'un support et au moins deux composés photochromes de naphthopyran sélectionnés sur la base de critères spécifiques, qui, lorsqu'ils sont exposés à des radiations ultraviolettes solaires, adoptent des couleurs neutres de gris ou de marron situées dans les gammes a* et b* de +10 à -10 dans le système des couleurs CIELAB. On décrit également des supports, c'est-à-dire des solvants organiques et des matières réceptrices polymères organiques telles que des articles transparents du point de vue optique comme par exemple des lentilles ophthalmiques ou d'autres objets transparents en plastique qui contiennent ces composés de naphthopyran ou qui possèdent un revêtement de ces derniers.

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