Articles exhibiting durable color and/or fluorescent properties

C - Chemistry – Metallurgy – 09 – K

Patent

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C09K 11/06 (2006.01) B44F 1/04 (2006.01) C08K 5/00 (2006.01) C08K 5/3435 (2006.01) C09K 15/18 (2006.01) H01L 31/055 (2006.01)

Patent

CA 2205805

An article exhibiting durable fluorescent properties comprising a polymeric matrix, dye and hindered amine light stabilizer, wherein the polymeric matrix is comprised of polycarbonate and the dye is comprised of a dye selected from the group consisting essentially of thioxanthone, perylene imide and/or thioindigoid compounds. The article exhibits durable fluorescence which resists degradation by ultraviolet or visible radiation. The invention is optionally combined with retroreflective elements so that the resultant article has durable fluorescent properties when exposed to sunlight and is also retroreflective. A method of manufacturing an article exhibiting durable fluorescent properties is also disclosed along with a method of increasing the durability of polycarbonate in a dyed system.

L'invention concerne un article présentant des propriétés fluorescentes durables comprenant une matrice polymère, un colorant et un photostabilisant à amines entravées, la matrice polymère constituée d'un polycarbonate et du colorant comprend un colorant choisi dans le groupe constitué essentiellement de composés thioxanthone, pérylène imide et/ou thioindigoïde. L'article présente une fluorescence durable résistant à la dégradation par le rayonnement ultraviolet ou visible. L'invention peut également être combinée à des éléments réfléchissants de sorte que l'article obtenu présente des propriétés fluorescentes durables, lorsqu'il est exposé à la lumière du soleil, et soit également réfléchissant. L'invention concerne également un procédé de production d'un article présentant des propriétés fluorescentes durables, ainsi qu'un procédé d'augmentation de la durabilité du polycarbonate dans un système coloré.

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