Patent ID: 9607736
Date: 2017-03-28
CPC Classifications: H01B,Y10T

Claim:
1. An insulated wire, comprising: a conductor; and an insulating film disposed on the conductor, the insulating film comprising a first layer of a first polyamideimide containing an adhesion improver; a second layer of a second polyamideimide disposed on the first layer, the second polyamideimide being obtained by reacting an isocyanate component containing 10 to 70 mol % in total of 2,4′-diphenylmethane diisocyanate and dimer acid diisocyanate with an acid component; and a third layer of a polyimide disposed on the second layer, the polyimide being obtained by reacting an acid component containing 50 to 80 mol % of 3,3′,4,4′-biphenyl tetracarboxylic dianhydride and 20 to 50 mol % of pyromellitic anhydride with a diamine component containing 4,4′-diaminodiphenyl ether, wherein, with regard to a proportion of thicknesses of the first to third layers in relation to the total thickness of the insulating film, the first layer is 10 to 20%, the second layer is 10 to 75%, and the third layer is 10 to 75%.