| 主权项 |
1. A thermoplastic composition comprising, based on the total weight of the composition,
88 to 98 wt % of a poly(carbonate-arylate ester), wherein the poly(carbonate-arylate ester) is a poly(carbonate-monoaryl arylate ester), a poly(carbonate-monoaryl arylate ester) comprising siloxane units, or a combination comprising at least one of the foregoing; and 2 to 12 wt % of bisphenol A bis(diphenyl phosphate); optionally, up to 5 wt % of an additive selected from a processing aid, a heat stabilizer, an ultra violet light absorber, a colorant, or a combination comprising at least one of the foregoing, wherein an article molded from the composition has
a maximum average heat release (MAHRE) of less than or equal to 90 kW/m2 determined according to ISO 5660-1 on a 3 mm thick plaque, anda smoke density after 4 minutes (Ds-4) of less than or equal to 300 determined according to ISO 5659-2 on a 3 mm thick plaque,wherein the poly(carbonate-monoaryl arylate ester) comprises
repeating carbonate units of the formula wherein
Ra and Rb are each independently are each independently C1-12 alkyl,p and q are each independently integers of 0 to 4, andXa is a single bond, —O—, —S—, —S(O)—, —S(O)2—, —C(O)—, or a C1-18 organic group; and monoarylate ester units of the formula wherein
Rh is each independently a halogen or C1-10 hydrocarbon group, andn is 0 to 4; andwherein the poly(carbonate-monoaryl arylate ester) comprising siloxane units comprises
repeating carbonate units of the formula wherein
Ra and Rb are each independently are each independently C1-12 alkyl,p and q are each independently integers of 0 to 4, andXa is a single bond, —O—, —S—, —S(O)—, —S(O)2—, —C(O)—, or a C1-18 organic group; and arylate ester units of the formula wherein
Rh is each independently a halogen or C1-10 hydrocarbon group, andn is 0 to 4; andsiloxane units of the formula wherein
each R is independently a C1-13 monovalent hydrocarbon group, andE has an average value of 2 to 500; and wherein poly(carbonate-arylate ester) is a combination of a poly(bisphenol-A carbonate)-co-poly(isophthalate-terephthalate-resorcinol ester) and a poly(bisphenol-A carbonate)-co-poly(isophthalate-terephthalate-resorcinol ester)-co-poly(siloxane) comprising, a based on the total weight of the poly(carbonate-arylate ester)s, 20 to 80 wt % of the poly(bisphenol-A carbonate)-co-poly(isophthalate-terephthalate-resorcinol ester); and 20 to 80 wt % of the poly(bisphenol-A carbonate)-co-poly(isophthalate-terephthalate-resorcinol ester)-co-poly(siloxane) which comprises siloxane units of the formula or a combination thereof, wherein E has an average value of 5 to 60, and the siloxane units are present in an amount effective to provide 0.1 to 10 wt % of siloxane units, based on the weight of the poly(bisphenol-A carbonate)-co-poly(isophthalate-terephthalate-resorcinol ester)-co-poly(siloxane). |
