| 摘要 |
PROBLEM TO BE SOLVED: To provide an insulated wire that has excellent environmental atmosphere resistance, processing resistance, and also that has excellent flexibility, heat resistance, and thermal deterioration resistance.SOLUTION: The insulated wire comprises a conductor 10, and an insulation film 20 provided thereon and composed of: a first layer 21 composed of a first polyamide-imide comprising an adhesion improver; a second layer 22 provided on this first layer and composed of a second polyamide-imide produced by reacting an isocyanate component containing 2,4'-diphenylmethane diisocyanate and dimer acid diisocyanate by a total of 10 to 70 mol%, with an acid component; and a third layer 23 provided on this second layer and composed of a polyimide produced by reacting an acid component composed of 3,3',4,4'-biphenyl tetracarboxylic dianhydride by 50 to 80 mol% and pyromellitic anhydride by 20 to 50 mol%, with a diamine component containing 4,4'-diamino diphenyl ether. |
