Electrical tracking resistance compositions, articles formed therefrom, and methods of manufacture thereof
A composition comprises, based on the total weight of the composition, 25 wt % to 50 wt % of a polyetherimide; and 50 wt % to 75 wt % of a polyphthalamide; wherein the composition has a number of drops to tracking at 250 volts of greater than or equal to 50 drops determined according to ASTM D-3638-85.
1. A composition comprising, based on the total weight of the composition,
25 wt % to 40 wt % of a polyetherimide; and
60 wt % to 75 wt % of a polyphthalamide;
wherein the composition has a number of drops to tracking at 250 volts of greater than or equal to 50 drops determined according to ASTM D-3638-85, and
the polyphthalamide comprises units of the formula
wherein each G 1 is a C6 alkylene group, and
wherein the polyetherimide comprises units of the formula
R is m-phenylene, and T is —O—Z—O— wherein Z is a divalent group of formula
and Q is 2,2-isopropylidene, and the composition is free of aliphatic polyamides.
2. The composition of claim 1 , wherein the composition has a tensile strength greater than or equal to 60 MPa determined according to ASTM D638, a tensile modulus greater than equal to 2500 GPa determined according to ASTM D638, and notched Izod impact strength greater than or equal to 45 Jim measured at room temperature on 3.2 millimeter thick bars as per ASTM D256.
3. The composition of claim 1 , wherein the composition has heat defection temperature of greater than or equal to 110° C. measured on 3.2 millimeter injection molded bar at 1.82 MPa stress according to ASTM D648.
4. The composition of claim 1 , further comprising 5 wt % to 20 wt % of talc.
5. An insulating material comprising the composition of claim 1 .
6. An article selected from a molded article, a thermoformed article, an extruded film, an extruded sheet, one or more layers of a multi-layer article, a substrate for a coated article, and a substrate for a metallized article made from the composition of claim 1 .
7. An article made from the composition of claim 1 , wherein the article is a solar apparatus, an electrical junction box, an electrical connector, an electrical vehicle charger, an outdoor electrical enclosure, a smart meter enclosure, a smart grid power node, a photovoltaic frame and a miniature circuit breaker.
8. A method of manufacture of an article, comprising molding, extruding, or casting the composition of claim 1 to form the article.
9. A method of controlling the tracking of an electrical current of an article of manufacture, the method comprising: providing a composition of claim 1 , and processing the composition to form an article of manufacture.
10. The method of claim 9 , wherein the article is a solar apparatus, an electrical junction box, an electrical connector, an electrical vehicle charger, an outdoor electrical enclosure, a smart meter enclosure, a smart grid power node, a photovoltaic frame and a miniature circuit breaker.
11. The composition of claim 1 consisting essentially of the polyetherimide; and the polyphthalamide.