Polycarbonate molding compositions

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 69/00 (2006.01) C08L 55/02 (2006.01)

Patent

CA 2750250

An impact modified thermoplastic molding composition comprising aromatic polycarbonate and/or polyester carbonate and a rubber-modified graft polymer prepared by the bulk, solution or bulk- suspension polymerization process is disclosed. The composition that is characterized by its low content of lithium ions and its specified content of sodium and/or potassium ions exceeding a minimum level and preferably not exceeding a maximum level features improved hydrolytic resistance.

L'invention porte sur une composition à mouler thermoplastique présentant une résistance au choc modifiée renfermant un polycarbonate aromatique et/ou un polyester-carbonate et un polymère greffé modifié par du caoutchouc préparé par le procédé de polymérisation en masse, en solution ou en masse-suspension. La composition, qui est caractérisée par sa faible teneur en ions du lithium et sa teneur spécifiée en ions de sodium et/ou de potassium dépassant un niveau minimal et de préférence ne dépassant pas un niveau maximal, présente une résistance hydrolytique améliorée.

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