Thermoplastic molding composition having improved toughness...

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 67/02 (2006.01) C08L 69/00 (2006.01)

Patent

CA 2670729

A thermoplastic molding composition containing polycarbonate, polyalkylene terephthalate and an elastomeric impact modifier is disclosed. The impact modifier that exhibits pH value of less than 7 and contains less than 500 ppm of sodium ions, is characterized in its core/shell morphology, where the core contains polymerized butadiene structural units and shell contains polymerized methacrylate structural units. The core is present in an amount of 40 to 70 percent relative to the weight of the impact modifier, and the glass transition temperature of the shell is greater than 23°C. The composition is characterized in its improved surface quality and toughness at low temperatures.

Composition de moulage thermoplastique contenant un polycarbonate, un polyalkylène téréphtalate et un modificateur d'impact élastomère. Le modificateur d'impact présente une valeur de pH inférieure à 7 et contient moins de 500 ppm d'ions sodium, il se caractérise par sa morphologie noyau/enveloppe, ledit noyau contenant des unités structurelles de butadiène polymérisées et ladite enveloppe des unités structurelles de méthacrylate polymérisées. Le noyau est présent en une quantité de 40 à 70 pour cent par rapport au poids du modificateur d'impact, et la température de transition vitreuse de l'enveloppe est supérieure à 23 °C. La composition se caractérise par une meilleure qualité de surface et une meilleure ténacité à des températures faibles.

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