ABS-Moulding compositions having high notched impact strength

ABS-moulding compositions comprising an ABS-polymer of

• (a) 5 to 70% by weight of one or more graft products which have been made by graft polymerising styrene, a mixture of styrene and acrylonitrile, a mixture of styrene and methylmethacrylate or a mixture of styrene, acrylonitrile and methylmethacrylates onto a polybutadiene, butadiene/styrene or butadiene/acrylonitrile rubber,
• (b) 95 to 30% by weight of one or more thermoplastic resins selected from polystyrene, styrene/acrylonitrile copolymers, .alpha.-methylstyrene/acrylonitrile copolymers, polymethylmethacrylate and terpolymers of styrene, acrylonitrile and maleic acid anhydride, and
• (c) 0.05 to 1% by weight (based on total mixture) of a perfluoroalkane acid of the formula CF.sub.3 --CF.sub.2).sub.n COOH, CF.sub.3 --CF.sub.2).sub.n SO.sub.3 H (n=1-20), a salt of said acid, an ester or an amide of said acid.