Flame retardant poly(siloxane-etherimide) copolymer compositions, methods of manufacture, and articles formed therefrom

摘要

A composition comprising: a first polymer comprising a poly(etherimide-siloxane) copolymer comprising (a) a repeating polyetherimide unit, and (b) a poly(siloxane) block unit, a second polymer different from the first polymer and comprising bromine; and optionally, a third polymer comprising a polycarbonate different from the first polymer and second polymer; wherein polysiloxane block units are present in the composition in an amount of at least 0.3 wt %, and bromine is present in the composition in an amount of at least 7.8 wt %, each based on the sum of the wt % of the first, second, and third polymers; and further wherein an article molded from the composition has an OSU integrated 2 minute heat release test value of less than 65 kW-min/m2 and a peak heat release rate of less than 65 kW/m2, and an E662 smoke test Dmax value of less than 200.

主权项

1. A composition comprising:
a first polymer comprising a poly(etherimide-siloxane) copolymer comprising (a) a repeating polyetherimide unit, and (b) a repeating poly(siloxane) block unit, the poly(siloxane) block unit having the formula: wherein
R is each independently a C1-C30 hydrocarbon group, andE has an average value of 5 to 200; a second polymer different from the first polymer and comprising bromine; and an optional one or more polymers comprising a polycarbonate different from the second polymer; wherein
the composition is free of copolymers comprising carbonate units and ester units,the wt % of the first polymer, second polymer, and optional one or more polymers sum to 100 wt %,siloxane units are present in the composition in an amount of 0.3 to 3.5 wt %, based on the sum of the wt % of the first, second, and optional one or more polymers, andbromine is present in the composition in an amount of 7.8 wt % to 13 wt %, based on the sum of the wt % of the first, second, and optional one or more polymers; andfurther wherein an article molded or formed from the composition has
an OSU integrated 2 minute heat release test value of less than 65 kW-min/m2 and a peak heat release rate of less than 65 kW/m2 as measured using the method of FAR F25.4, in accordance with Federal Aviation Regulation FAR 25.853 (d), and an E662 smoke test Dmax value of less than 200 when measured at a thickness of 1.6 mm.