Flame-protected impact strength modified polycarbonate...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 69/00 (2006.01) C08K 3/36 (2006.01)

Patent

CA 2748327

The present invention relates to impact strength modified polycarbonate compounds comprising a graft polymer comprising silicon acrylate composite rubber as a graft basis, wherein the proportion of silicone rubber is 65 - 95 % by weight (relative to the graft basis), talc having a d98-value (also known as a "top cut") of less than 20 µm, and phosphoric flame-protection agents, to the use of the polycarbonate compounds for producing molded parts, and to the molded parts themselves. The compositions and molding compounds according to the invention comprise an optimal combination of good flame protection, good chemical and hydrolysis resistance, and good mechanical properties (particularly high E-modulus and high notch impact toughness a K).

La présente invention concerne des compositions polycarbonates à résilience modifiée qui contiennent un polymère greffé contenant un caoutchouc composite silicone-acrylate comme base de greffe, la part de caoutchouc silicone étant comprise entre 60 et 95 % en poids (par rapport à la base de greffe), du talc d'une coupe granulométrique d98 (également appelé « top cut ») inférieure à 20 µm, et des agents ignifuges contenant du phosphore. L'invention concerne également l'utilisation des compositions polycarbonates pour la fabrication de corps moulés et les corps moulés eux-mêmes. Les compositions et les masses moulées selon l'invention associent de manière optimale une bonne protection ignifuge, une bonne résistance aux substances chimiques et à l'hydrolyse et de bonnes propriétés mécaniques (c'est-à-dire qu'elles présentent notamment un coefficient d'élasticité élevé et une valeur de résilience élevée ak).

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