Flame retardant polyimide/polyester-polycarbonate compositions, methods of manufacture, and articles formed therefrom

A composition comprising, based on the total weight of the composition,

• from 20 to 60 wt. % of a polyimide having a glass transition temperature above 180° C.;
• from 10 to 30 wt. % a polyester-polycarbonate, wherein the content of ester units is from greater than 0 to 60 wt. % of the polyester-polycarbonate;
• from 30 to 60 wt. % of a reinforcing filler;
• from 0.01 to 0.15 wt. % of potassium diphenyl sulfone sulfonate;
• from 0.01 to 0.5 wt. % of sodium toluene sulfonate;
• and
• from 0.5 to 1 wt. % of a siloxane copolymer comprising a polyetherimide-siloxane copolymer;
• wherein
• the polyimide is a polyetherimide derived from the reaction of bisphenol-A dianhydride, oxydiphthalic anhydride, or a combination thereof, with m-phenylenediamine, p-phenylenediamine, a diamino diaryl sulfone, or a combination thereof;
• the polyester-polycarbonate comprises poly(isophthalate-terephthalate-resorcinol ester)-co-(bisphenol-A carbonate);
• the ratio of potassium diphenyl sulfone sulfonate to sodium toluene sulfonate is 2.5:1 to 6:1;
• and
• an article molded from the composition attains a UL94 rating of V0 at a thickness of 0.83 mm without dripping.