Thermoplastic polyurethane composition with high insulation resistance
Flame retardant compositions that include a thermoplastic polyurethane, a metal hydrate flame retardant and a phosphorus-based flame retardant are provided. The compositions are characterized by good flame retardant properties, as well as high insulation resistance.
1. A composition comprising:
(a) 20-40 wt % of a thermoplastic polyurethane;
(b) 30-41 wt % of a metal hydrate flame retardant selected from the group consisting of aluminum hydroxide and magnesium hydroxide; and
(c) 10-15 wt % of bisphenol A bis(diphenyl phosphate);
(d) 0.1-5 wt % of a char-forming agent comprising an epoxidized novolac resin;
the wt % based on the total weight of the composition;
the composition characterized in that it passes the UL 94 flame retardant standard and has an insulation resistance of at least 3 GΩ.m as measured by UL 62.
2. The composition of claim 1 , in which the composition has an insulation resistance of at least 3.5 GΩ.m as measured by UL 62.
3. The composition of claim 1 , comprising 30 to 40 wt % metal hydrate flame retardant, based on the total weight of the composition.
4. The composition of claim 1 , wherein the metal hydrate flame retardant is an aluminum hydroxide.
5. An insulated electrically conductive wire at least partially coated with the composition of claim 1 .
6. An insulated electrically conductive wire at least partially coated with the composition of claim 3 .