Polyester/polycarbonate blends

A thermoplastic molding composition comprising

• A) from 1 to 97.85% by weight of at least one thermoplastic polyester,
• B) from 1 to 97.85% by weight of at least one polycarbonate,
• C) from 1 to 50% by weight of an elastomeric polymer,
• D) from 0.1 to 5% by weight of a phosphorus-containing stabilizer, wherein component D) is composed of an organic phosphonite of the formula (I):
• where
• m is 0 or 1,
• n is 0 or 1,
• Y is an oxygen bridge, a sulfur bridge or a 1,4-phenylene bridge, or a bridging unit of the formula —CH(R2)—;
• each of the R—O— and R1—O-groups, independently of one another, is the radical of an aliphatic, alicyclic or aromatic alcohol which may contain up to three hydroxyl groups, but excluding any arrangement of the hydroxyl groups which permits these to be part of a phosphorus-containing ring (termed monovalent R—O-groups), or two R—O— or, respectively, R1—O-groups, bonded to a phosphorus atom, in each case independently of one another, together are the radical of an aliphatic, alicyclic or aromatic alcohol having a total of up to three hydroxyl groups (termed bivalent R—O—, or, respectively, R1—O-groups),
• R2 is hydrogen, C1-C8-alkyl or a group of the formula COOR3, and
• R3 is C1-8-alkyl
• or is composed of at least one inorganic salt of phosphoric acids,
• E) from 0.05 to 2% by weight of an organic acid, and
• F) from 0 to 60% by weight of other additives, where the percentages by weight of components A) to F) give 100%.