High-heat polycarbonate blends that are halogen-free and flame retardant

摘要

The present invention is directed to a composition comprising:
(a) a polyethylene terephthalate;(b) a copolycarbonate of 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine (PPPBP) and another bisphenol;(c) a polycarbonate-polysiloxane copolymer; and(d) a non-halogenated flame retardant.;The invention is also directed to processes for making such compositions as well as articles derived therefrom.

主权项

1. A composition comprising:
(a) 10 to 50 percent by weight of a polyester; (b) 20 to 70 percent by weight of Polycarbonate A which is a copolycarbonate of 2-phenyl-3,3-bis(4-hydroxyphenyl)phthalimidine (PPPBP) and another bisphenol; (c) 10 to 60 percent by weight of Polycarbonate B, which is a polycarbonate-polysiloxane copolymer; and (d) 4 to 10 percent by weight of a non-halogenated flame retardant provided that when the non-halogenated flame retardant is an organophosphate, organophosphonate, or organophosphinate, the weight percent is 4 to 7 percent by weight; wherein: the weight percents are based on the total weight of the composition and the composition passes the following tests:
(i) the Ball Pressure Test according to (IEC) DIN EN 60695-10-2, VDE 0471 Part 10-2 or (IEC) DIN EN 60335-1 at 125° C.; or(ii) the Glow Wire Flammability Test (IEC) 60695-2-12 at 850° C.; and(iii) has a UL94 Vertical Flame Rating, V-0 at 1.5 mm.