Fade-resistant fluorescent retroreflective articles

Details Fade-resistant fluorescent retroreflective articles Fade-resistant fluorescent retroreflective articles

C - Chemistry, Metallurgy

08

L

C08L 27/06 (2006.01) B44F 1/04 (2006.01) C08K 5/132 (2006.01) C08K 5/3435 (2006.01) C08K 5/3437 (2006.01)

Patent

CA 2552070

A fade-resistant fluorescent colorant composition includes a polymer; a fade- susceptible fluorescent colorant, provided the fluorescent colorant is not a perylene imide derivative; and a hindered amine light stabilizer of molecular weight greater than about 1,200 AMU. The hindered amine light stabilizer includes at least one secondary or tertiary hindered amine. A fade-resistant retroreflective article includes the colorant composition and a retroreflective structure, comprising an array of transparent optical elements. Also included are methods for forming the composition and articles.

L'invention concerne une composition colorante fluorescente solide à la lumière qui comprend un polymère, un colorant fluorescent susceptible de décoloration à condition que ce colorant ne soit pas un dérivé d'imide de perylène, et un agent photostabilisateur à amine empêchée de poids moléculaire supérieur à environ 1 200 AMU. Ledit agent photostabilisateur à amine empêchée comprend au moins une amine empêchée secondaire ou tertiaire. Un article rétroréfléchissant résistant à la décoloration comprend la composition colorante et une structure rétroréfléchissante comprenant un réseau d'éléments optiques transparents. L'invention concerne également des procédés permettant de former ladite composition et des articles.

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