Flame-resistant polycarbonate-polyester blend

A thermoplastic molding compound consisting of

• A) 45% to 65% by weight of at least one of an aromatic polycarbonate, polyestercarbonate, and mixtures thereof,
• B) 18% by weight to 31% by weight of at least one polybutylene terephthalate having a flowability of 5 g/10 min to 30 g/10 min to DIN EN ISO 1133 at measurement temperature 250° C. and a load of 2.16 kg, wherein the polybutylene terephthalate comprises structural units derived from terephthalic acid and butane-1,4-diol and from no other acid or diol
• C) 3% to 10% by weight of at least one rubber-modified graft polymer having a graft base comprising a silicone-acrylate composite rubber and a silicone rubber content of 20% to 60% by weight based on the graft base,
• D) 8% to 13% by weight of at least one phosphazene,
• E) 0% to 8.0% by weight of at least one polymer additive selected from the group consisting of lubricants and demolding agents, antistats, conductivity additives, stabilizers, anti-drip agents, flame retardant synergists, smoke inhibitors, dyes and pigments,
• wherein the weight ratio of components D) to C) is from 1.3:1 to 2.5:1.