JPS649343B

1. Thermoplastic moulding compositions of (A) thermoplastic, aromatic polycarbonates having molecular weights Mw of between 10,000 and 200,000 (Mw = weight average, determined using light scattering), optionally, (B) thermoplastic polyesters, preferably in a quantitative ratio of polycarbonate to polyester of 98:2 to 30:70, and, optionally, (C) rubber-elastic graft polymers in quantities of 1 - 30% by weight, based on the total weight of (A) and (B), characterized by a content of (D) hydrogenated copolymers of unsaturated nitrile units and conjugated diene monomers, in which the content of unsaturated nitrile monomers is 10 - 55% by weight and the degree of hydrogenation of the conjugated diene units is > 50 mol-%, wherein in mixtures of (a) (A) + (D) and (b) (A) + (B) + (D) the quantity by weight of (D) is 2 - 30% by weight, based on the total weight of (A) + (D) respectively (A) + (B), and in mixtures of (c) (A) + (B) + (C) + (D) the quantity by weight of (D) is 0.5 - 7% by weight, based on the total weight of (A) + (B).