Impact-modified polycarbonate compositions with high...

C - Chemistry – Metallurgy – 08 – L

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C08L 69/00 (2006.01)

Patent

CA 2722228

The present invention relates to polycarbonate compositions comprising A) an aromatic polycarbonate and/or an aromatic polyester carbonate, B) a graft polymer obtained by the co-precipitation of a mixture of at least two graft polymer dispersions B.1 and B.2, characterized in that the production of graft polymer component B.1 is performed using at least one redox system as an initiator and that the production of graft polymer component B.2 is performed using at least one persulfate compound as an initiator, and C) optionally vinyl(co)polymer and/or polyalkylene terephthalate, D) optionally flame retardants containing phosphorous, E) at least one phenolic antioxidant, F) optionally neutral co-stabilizers (synergists) containing phosphorous or sulfur and G) optionally additives characterized by an optimum combination of good hydrolysis resistance and a light natural colour, and to the use of the polycarbonate compositions for the production of molded bodies, and to said molded bodies.

L'invention concerne des compositions de polycarbonate contenant:A) un polycarbonate aromatique et/ou un carbonate de polyester aromatique, B) un polymérisat greffé, obtenu par coprécipitation d'un mélange d'au moins deux dispersions de polymérisat greffé B.1 et B,2, qui se caractérisent en ce que la production du constituant polymérisat greffé B,1 s'effectue au moyen d'au moins un système d'oxydoréduction, comme initiateur et en ce que la production du constituant polymérisat greffé B.2 s'effectue au moyen d'au moins un composé persulfate, comme initiateur, et C) éventuellement un (co)polymérisat vinylique et/ou un polyalkylène-térephtalate, D) éventuellement un agent ignifuge à base de phosphore, E) au moins un antioxydant phénolique, F) éventuellement des costabilisants neutres à base de phosphore ou de soufre (synergistes) et G) éventuellement des additifs, qui se caractérisent par une combinaison optimale entre une bonne résistante hydrolytique et une couleur naturelle claire. L'invention concerne également l'utilisation de ces compositions polycarbonate pour produire des corps moulés, ainsi que les corps moulés à proprement parler.

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