Thermoplastic molding compounds containing aliphatic polycarbonates

Thermoplastic molding compounds containing

• (1.) thermoplastic aromatic polycarbonates, thermoplastic aromatic polyesters or mixtures thereof,
• (2.) graft polymers obtained by grafting of
• (2.1.) 5 to 90 parts by weight of a mixture of
• (2.1.1.) 50 to 95 parts by weight styrene, .alpha.-methylstyrene, nucleus-substituted styrene, methyl methacrylate or mixtures thereof and
• (2.1.2.) 50 to 5 parts by weight acrylonitrile, methacrylonitrile, methyl methacrylate, maleic anhydride, N-substituted maleic imide or mixtures thereof onto
• (2.2.) 95 to 10 parts by weight of a rubber having a glass temperature T.sub.G of <10.degree. C., and, optionally,
• (2.a) thermoplastic copolymers obtained by copolymerization of
• (2.a.1.) 50 to 95 parts by weight styrene, .alpha.-methylstyrene, nucleus-substituted styrene, methyl methacrylate or mixtures thereof with
• (2.a.2.) 50 to 5 parts by weight acrylonitrile, methacrylonitrile, methyl methacrylate, N-substituted maleic imide or mixtures thereof,
• characterized in they additionally contain aliphatic polycarbonates having weight average molecular weights Mw (as measured by ultracentrifugation or light scattering) in the range from 15,000 to 500,000.