Methods and compositions for protecting polymers from uv light

Details Methods and compositions for protecting polymers from uv light Methods and compositions for protecting polymers from uv light

C - Chemistry, Metallurgy

08

L

C08L 23/10 (2006.01) C08J 3/20 (2006.01) C08K 5/3492 (2006.01) C08L 23/04 (2006.01) C08L 79/04 (2006.01)

Patent

CA 2330422

A polymeric article, such as an extruded or molded article or a biaxially oriented tape of film, and a method of stabilizing such a polymeric article to protect the article from degradation due to exposure to UV light. The article is formed by blending a polymeric material with from about 50 to about 5,000 ppm of at least one ortho hydroxy tris-aryl triazine light absorber and from about 500 ppm to about 1.25 percent of at least one oligomeric, polymeric, or high molecular weight HALS having a molecular weight of at least about 500, wherein the weight ratio of HALS to triazine light absorber is from about 3:1 to about 20:1, to form a stabilized polymeric composition, and forming an extruded or molded article or a biaxially oriented tape or film from the stabilized polymeric composition.

L'invention concerne un article polymère, tel qu'un article extrudé ou moulé ou une bande ou un film orienté biaxialement, ainsi qu'un procédé de stabilisation dudit article polymère pour le protéger d'une dégradation due à une exposition aux rayons UV. On fabrique ledit article en homogénéisant, pour produire une composition polymère stabilisée, une matière polymère contenant entre environ 50 et environ 5000 mg/kg d'au moins un absorbeur de lumière à base d'ortho hydroxy tris-aryl triazine et entre environ 500 mg/kg et environ 1,25 % d'au moins un anti-UV à amine encombrée (HALS), lequel est oligomère, polymère ou à masse moléculaire élevée, cette masse moléculaire s'élevant à environ 500. Dans cette matière polymère, la proportion pondérale entre l'anti-UV à amine encombrée et l'absorbeur de lumière à base de triazine se situe entre environ 3:1 et environ 20:1. On forme ensuite, à partir de ladite composition polymère stabilisée, un article extrudé ou moulé ou une bande ou un film orienté biaxialement.

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