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

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.

2. The composition of claim 1 , comprising:

(a) 14 to 30 percent by weight of a polyester;

(b) 30 to 60 percent by weight of Polycarbonate A; and

(c) 20 to 50 percent by weight of Polycarbonate B.

3. The composition of claim 2 , comprising:

(a) 15 to 28 percent by weight of a polyester;

(b) 32 to 68 percent by weight of Polycarbonate A; and

(c) 22 to 48 percent by weight of Polycarbonate B.

4. The composition of claim 3 , comprising:

(a) 15 to 28 percent by weight of a polyester;

(b) 32 to 68 percent by weight of Polycarbonate A; and

(c) 22 to 40 percent by weight of Polycarbonate B.

5. The composition of any one of claims 1 - 4 , wherein

(a) the polyester is polyethylene terephthalate (PET) or polybutylene terephthalate (PBT);

(b) Polycarbonate A is a copolymer of PPPBP and bisphenol-A;

(c) Polycarbonate B is a polycarbonate/polydimethylsiloxane (PC/PDMS) copolymer.

(d) the non-halogenated flame retardant is selected from the group consisting of bisphenol-A bis(diphenylphosphate (BPADP), Polyphosphonate, Phosphazene, and Solid Phosphonate ester.

6. The composition of claim 5 , comprising 4 to 7 percent by weight of a non-halogenated flame retardant.

7. The composition of claim 5 , comprising 4 to 10 percent by weight of a non-halogenated flame retardant provided that the non-halogenated flame retardant is not an organophosphate, organophosphonate, or organophosphinate flame retardant.

8. The composition of claim 7 , wherein the non-halogenated flame retardant is selected from the group consisting of Polyphosphonate, Phosphazene, and Solid Phosphonate ester.

9. A composition comprising:

(a) 15 to 28 percent by weight of PET or PBT;

(b) 32 to 68 percent by weight of Polycarbonate A which is a copolymer of PPPBP and bisphenol-A;

(c) 22 to 48 percent by weight of Polycarbonate B which is a polycarbonate/polydimethylsiloxane (PC/PDMS) copolymer; and

(d) 4 to 7 percent by weight of organophosphate, organophosphonate, or organophosphinate non-halogenated flame retardant.

10. The composition of claim 9 , comprising 4 to 7 percent by weight of BPADP.

11. A composition comprising:

(a) 15 to 28 percent by weight of PET or PBT;

(b) 32 to 68 percent by weight of Polycarbonate A which is a copolymer of PPPBP and bisphenol-A;

(c) 22 to 48 percent by weight of Polycarbonate B which is a polycarbonate/polydimethylsiloxane (PC/PDMS) copolymer; and

(d) 4 to 10 percent by weight of a non-halogenated flame retardant provided that the non-halogenated flame retardant is not an organophosphate, organophosphonate, or organophosphinate flame retardant.

12. The composition of claim 11 , comprising 4 to 10 percent by weight of non-halogenated flame retardant which is selected from the group consisting of Polyphosphonate, Phosphazene, and Solid Phosphonate.

13. An article comprising the composition of claim 1 .