Transparent flame retardant ductile compositions and thin-wall articles thereof

A thermoplastic composition comprising

• a highly branched polycarbonate comprising 1.5-5.0 mole % branching, wherein the highly branched polycarbonate has a weight average molecular weight of 25,000-45,000 grams per mole, as determined by gel permeation chromatography, according to polystyrene standards and calculated for polycarbonate;
• a branched polycarbonate comprising 0.1-1.0 mole % branching, wherein the branched polycarbonate has a weight average molecular weight of 25,000-45,000 grams per mole, as determined by gel permeation chromatography, according to polystyrene standards and calculated for polycarbonate;
• a first poly (carbonate siloxane) having 30-70 wt % siloxane,
• a second poly (carbonate siloxane) having 5-15 wt % siloxane, and
• wherein the total siloxane content provided to the thermoplastic composition by the first and second poly (carbonate-siloxanes) is less than 4.17 wt %;
• and
• wherein the ratio of the siloxane content provided to the thermoplastic composition by the first poly (carbonate siloxane) to the siloxane content provided to the thermoplastic composition by the second poly (carbonate siloxane) is less than 6.7 to 1,
• a flame retardant comprising a phosphorous-nitrogen bond;
• optionally, an auxiliary polycarbonate;
• wherein a molded sample of the composition has a percent transmission of at least 80% as determined according to ASTM D1003 on a molded sample having a thickness of 0.8 mm.