Poly(etherimide-siloxane)-polyester compositions, method of manufacture, and articles made therefrom

1. A thermoplastic composition comprising

35-95 weight percent of a poly(etherimide-siloxane) copolymer having a siloxane content of more than 0 to less than 50 weight percent based on the total weight of the poly(etherimide-siloxane) copolymer;

40-65 weight percent of a polyester comprising a combination of a poly(carbonate-ester) copolymer and a polyethylene naphthalate; and

0-20 weight percent of one or more additives;

wherein the weight percent of each component is based on the combined weight of the poly(etherimide-siloxane) copolymer and the polyester.

2. The thermoplastic composition of claim 1 , wherein the thermoplastic composition has one or more of the following properties:

a flexural modulus of 200 to 3,000 megaPascals as determined by ASTM D790 at a thickness of 6.4 millimeters; and

a tensile elongation at break of greater than or equal to 10% as determined by ASTM D638.

3. The thermoplastic composition of claim 1 , wherein the poly(etherimide-siloxane) copolymer is a block copolymer having a siloxane content of 5 to 50 weight percent, based on the total weight of the block copolymer, and comprises repeating units of the formula

wherein Z is a residue of bisphenol A, R 4 is n-propylene, E is 2 to 50, n is 5 to 100, each R′ is methyl, and R is phenylene.

4. The thermoplastic composition of claim 1 , wherein the one or more additives comprises a thermal stabilizer, a hydrolysis stabilizer, a nucleating agent, a metal deactivator, a flame retardant additive, or a combination comprising at least one of the foregoing.

5. The thermoplastic composition of claim 1 , wherein the composition has a siloxane content of 1 to 25 percent by weight, based on the combined weight of the polymer components.

6. An article comprising the thermoplastic composition of claim 1 , wherein the article is an extruded part, an injection molded part, or a hot-compressed part.

7. An electrical wire comprising a conductor wire and a covering disposed over the conductor wire, wherein the covering comprises the thermoplastic composition of claim 1 , wherein the thermoplastic composition coating the conductor wire has one or more of a tensile stress of greater than 20 MPa, determined according to UL-1581 after 24 hours at 23° C.; and a tensile elongation of greater than 10% as extruded, determined according to UL-1581.

8. The electrical wire of claim 7 , wherein the thermoplastic composition coating the conductor wire has: a tensile stress of greater than 20 MPa, determined according to UL-1581 after heat aging for 168 hours at 158° C.; and a tensile elongation of greater than 10%, determined according to UL-1581 after heat aging for 168 hours at 158° C.

9. The electrical wire of claim 7 , wherein the thermoplastic composition coating the conductor wire has: a tensile stress of greater than 20 MPa, determined according to UL-1581 after heat aging for 168 hours at 180° C.; and a tensile elongation of greater than 10%, determined according to UL-1581 after heat aging for 168 hours at 180° C.

10. The electrical wire of claim 7 , wherein the electrical wire achieves a pass rating in the single wire vertical flame propagation test conducted according to EN50265-2-1/IEC60332-1.

11. The electrical wire of claim 7 wherein the electrical wire achieves a pass VW1 rating in the single wire burn test conducted according to UL-1581.

12. The electrical wire of claim 7 , wherein the thermoplastic composition has a tear strength of greater than 20 N/mm, determined according to ISO 34-1 in the presence of the conductor wire.

13. The electrical wire of claim 7 , wherein the conductor wire comprises copper, aluminum, lead, gold, silver, iron, nickel, chromium, or an alloy comprising at least one of the foregoing.

14. The electrical wire of claim 7 , wherein the covering has a thickness of 0.1 to 1 millimeter.

15. An article comprising the electrical wire of claim 7 .