Patent ID: 8784993
Filing Date: 2014-07-22
Classification: C08K,H01B,H01F,Y10T

Abstract:
1. A composite magnet wire comprising: a metal wire; and a coating applied to an outer surface of said wire, said coating comprising a polyimide polymer comprising poly(biphenyltetracarboxylic dianhydride-co-phenylenediamine) and a plurality of alumina nano particles dispersed in said polyimide polymer, said alumina nano particles having a surface treatment applied to outer surfaces of said alumina nano particles, said surface treatment comprises a phenyl-silane; said composite magnet wire having a thermal degradation temperature index of at least 300° C. as calculated in accordance with ASTM E1641 or ASTM D2307 (2005), wherein said coating comprises about 1% to about 6% by weight of said surface treated alumina nano particles, said coating on said outer surface has a thickness of about 25 μm to about 50 μm, and said alumina nano particles having an average particle size less than about 100 nanometers (nm).