Weather-resistant, high impact strength acrylic compositions

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 33/12 (2006.01) B29C 47/06 (2006.01) B32B 27/36 (2006.01) C08J 5/18 (2006.01) C08L 33/08 (2006.01) C08L 33/10 (2006.01) C08L 51/00 (2006.01)

Patent

CA 2423773

Disclosed is an improved weatherable thermoplastic composition. The composition is comprised of a copolymer of an alkyl acrylate or alkyl methacrylate and poly(methyl)methacrylate and a multi-stage, sequentially-polymerized impact modifier polymer. The copolymer is characterized by greater than 15 weight percent alkyl acrylate content. The multi-stage, sequentially- polymerized impact modifier is characterized by an elastomer stage, which is 55 percent by weight or greater of the impact modifier composition and is minimally crosslinked. The thermoplastic composition can be used in a wide range of film, sheet, or molded applications.

Divulgation d'une composition thermoplastique améliorée résistante aux intempéries. Ladite composition comprend un copolymère d'un acrylate d'alkyle ou d'un méthacrylate d'alkyle et d'un poly(méthacrylate de méthyle), ainsi qu'un polymère modificateur de la résistance aux chocs multi-séquence polymérisé en séquence. Le copolymère est caractérisé par une teneur massique en acrylate d'alkyle supérieure à 15 %. Le modificateur de la résistance aux chocs multi-séquence polymérisé en séquence est caractérisé par une séquence élastomère qui représente 55 % ou plus du poids dudit modificateur de la résistance aux chocs, et qui est minimalement réticulé. La composition thermoplastique peut servir à une large gamme d'applications de film, de feuille ou d'articles moulés.

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