Aminoplast resin photochromic coating composition and...

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 9/02 (2006.01) B32B 27/00 (2006.01) B32B 27/42 (2006.01) C08G 12/40 (2006.01) C08J 7/04 (2006.01) C09D 161/20 (2006.01) G02B 1/10 (2006.01) G02B 5/23 (2006.01) G02C 7/10 (2006.01) G03C 1/685 (2006.01)

Patent

CA 2355081

Described are articles having an aminoplast resin photochromic coating prepared from an aminoplast resin, component(s) having at least two different functional groups and photochromic substances. The coatings exhibit a Fischer microhardness of from 45 to 180 Newstons per mm2 and desirable photochromic properties, i.e., the formation of darker activated colors and faster rates of photochromic activation and fade when irradiated with ultraviolet light. Also described are photochromic aminplast resin articles.

L'invention concerne des articles à revêtement photochromique en résine aminoplaste. Ce type de revêtement est établi à partir d'une résine aminoplaste, d'un ou plusieurs composants ayant au moins deux groupes fonctionnels différents et de substances photochromiques. Il offre une microdureté de Fischer comprise entre 45 et 180 Newtons par mm<2> et les propriétés photochromiques souhaitées, à savoir: formation de couleurs activées plus sombres et taux plus rapides d'activation photochromique et d'affaiblissement photochromique en cas d'illumination par les rayons ultraviolets. L'invention concerne également des articles photochromiques en résine aminoplaste.

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