Thermoplastic composition containing polycarbonate-polyester...

C - Chemistry – Metallurgy – 08 – K

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C08K 3/34 (2006.01) C08K 5/09 (2006.01) C08L 69/00 (2006.01)

Patent

CA 2635919

A thermoplastic composition comprising a resinous blend of (A) aromatic polycarbonate and (B) polyester, (C) nanoclay and (D) carboxylic acid is disclosed. The composition features improved melt stability and impact strength over corresponding compositions that contain no acid. The nanoclay is present in an amount of 0.1 to 30 percent relative to the weight of the resinous blend, and the acid is present in an amount of 1 to 20 percent relative to the weight of the nanoclay. The average thickness of the clay particles is about 1 to 100 nm, and their average lengths and average widths, independently one of the other are 50 to 700 nm.

L'invention concerne une composition thermoplastique comprenant un mélange résineux (A) d'un polycarbonate aromatique et (B) d'un polyester, (C) une nanoargile et (D) un acide carboxylique. Cette composition présente une stabilité à l'état fondu et une résistance au choc améliorées par comparaison avec les compositions correspondantes ne contenant pas d'acide. La nanoargile est présente en quantité comprise entre 0,1 et 30% par rapport au poids du mélange résineux, et l'acide est présent en quantité comprise entre 1 et 20% par rapport au poids de la nanoargile. L'épaisseur moyenne des particules d'argile est comprise entre environ 1 et 100 nm, et leur longueur moyenne et leur largeur moyenne, indépendamment l'une de l'autre, sont comprises entre 50 et 700 nm.

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