G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 5/12 (2006.01) B32B 3/00 (2006.01) B32B 27/30 (2006.01) C08K 5/132 (2006.01) C08K 5/3435 (2006.01) C08K 5/3437 (2006.01) C08L 27/06 (2006.01) C09B 57/14 (2006.01) C08L 67/02 (2006.01)
Patent
CA 2396033
Polyvinyl chloride ("PVC") compositions and articles are provided which are suitable for fabricating flexible, reflective roll-up roadway signs in which a fluorescent perylene imide dye is present in the PVC reflective layer. The compositions afford enhanced fluorescence durability of perylene imide fluorescent dyes in the articles through the combination of a polymeric hindered amine light stabilizing compound having molecular weight greater about 1500, and a benzophenone ultraviolet absorbing compound. The compositions and articles preferably further comprise a polymeric plasticizer having molecular weight in the range of about 2000 to about 8000 to provide enhanced retention of retroreflectivity in flexible PVC highway signs.
L'invention concerne des compositions et des articles en chlorure de polyvinyle (PVC) pouvant être utilisés afin de fabriquer des pancartes routières souples, enroulables et réfléchissantes dont la couche réfléchissante en PVC contient un colorant fluorescent à base d'imide de pérylène. Ces compositions permettent d'améliorer la durée de la fluorescence des colorants d'imide de pérylène de ces articles au moyen de la combinaison d'un composé polymère stabilisant la lumière présentant un empêchement amide, dont le poids moléculaire est supérieur à 1500, et d'un composé absorbant les ultraviolets à base de benzophénone. Ces compositions et ces articles, contiennent, de préférence, de plus, un plastifiant polymère dont le poids moléculaire est situé entre 2000 et 8000, ce qui permet d'améliorer la conservation de la capacité rétroréfléchissante des pancartes d'autoroute en PVC souple.
Avery Dennison Corporation
Buoni Drew J.
Ridout & Maybee Llp
LandOfFree
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