Miscible polyphenylene ether sulfone/polyalkylene terephthalate blends

1. A composition comprising:

a polymer blend comprising

92 to 99 weight percent of a polyphenylene ether sulfone comprising greater than or equal to 70 mole % of repeating units of formula

wherein each R is independently a C 1-8 alkyl, C 6-12 aryl, C 7-11 alkylarylene, C 1-8 alkoxy, halogen, or a combination comprising at least one of the foregoing, and x is 0 to 4, n equals 25 to 1000, and the aryl sulfone linkages are 4,4′ linkages, 3,3′ linkages, 3,4′ linkages or a combination comprising at least one of the foregoing; and

1 to 8 weight percent of a polyalkylene terephthalate, wherein the polyalkylene terephthalate is derived from a C 2 to C 8 aliphatic or cycloaliphatic diol or a combination of aliphatic or cycloaliphatic C 2 to C 8 diols, weight percent is based on the combined weight of the polyphenylene ether sulfone and polyalkylene terephthalate;

wherein the polymer blend has a transmittance greater than or equal to 60% and a haze less than or equal to 10% at a thickness of 3.2 millimeters, as determined according to ASTM D1003-03.

2. The composition of claim 1 , wherein the polyphenylene ether sulfone comprises greater than or equal to 90 mol % of repeating units of formula (1).

3. The composition of claim 1 , wherein the polyalkylene terephthalate comprises a polyethylene terephthalate, a polycyclohexane dimethanol terephthalate, a polycyclohexane dimethanol-ethylene glycol terephthalate copolymer or a combination comprising at least one of the foregoing.

4. The composition of claim 1 , wherein the polyalkylene terephthalate is a polyethylene terephthalate having a diethylene glycol content of 0.1 to 4 weight percent based on the weight of the polyethylene terephthalate, an intrinsic viscosity greater than 0.4 and less than 0.90 dl/g and 5 to 100 meq/kg of carboxylic acid end groups.

5. The composition of claim 1 , wherein the polyphenylene ether sulfone has a weight average molecular weight of 10,000 to 90,000.

6. The composition of claim 1 , wherein the polyphenylene ether sulfone is present in an amount of 95 to 99 weight percent and the polyalkylene terephthalate is present in an amount of 1 to 5 weight percent.

7. The composition of claim 1 , wherein the polyphenylene ether sulfone is present in an amount of 95 to 97 weight percent and the polyalkylene terephthalate is present in an amount of 3 to 5 weight percent.

8. The composition of claim 1 , wherein the polymer blend has a single glass transition temperature and no melting temperature as determined by differential scanning calorimetry.

9. The composition of claim 1 , wherein the polymer blend has a melt volume rate greater than or equal to 2.5 at 6 minutes when determined according to ASTM D1238-10 at 300° C. and 6.7 kilograms.

10. The composition of claim 1 , wherein the polymer blend has a melt volume rate at 18 minutes is within 20% of the melt volume rate at 6 minutes when determined according to ASTM D1238-10 at 337° C. and 6.7 kilograms.

11. The composition of claim 1 , wherein the composition has a multi axial total energy greater than or equal to 60 Joules as determined according to ASTM D3763-10.

12. The composition of claim 1 , wherein the polyalkylene terephthalate has 0 to 300 ppm of cobalt and 10 to 300 pbw of antimony, titanium or a combination comprising at least one of the foregoing, based on the weight of the polyalkylene terephthalate, and no detectable lead, cadmium or mercury.

13. The composition of claim 1 , wherein the polyphenylene ether sulfone has a phenolic hydroxyl end group concentration less than 20 ppm.

14. The composition of claim 1 , wherein the composition further comprises titanium dioxide and the composition has a light transmittance less than 60% as determined according to ASTM D1003-03.