Insulated wire, coil and electric or electronic equipment
View Patent ↗An insulated wire, containing a conductor, an adhesion layer provided in direct contact with the conductor, and an insulating layer composed of a polyimide resin, which is provided on the adhesion layer, in which, in the adhesion layer, the content rate of a total formula weight of an imide structure represented by Formula (a) in a polyimide resin skeleton is 27% or more and 33% or less; and, in the polyimide resin of the insulating layer, the content rate of a total formula weight of the imide structure in a polyimide resin skeleton is more than 27% and 37% or less: a coil; and an electric or electronic equipment.
1. An insulated wire, comprising:
a conductor;
an adhesion layer composed of a polyimide resin, which is provided in direct contact with the conductor; and
an insulating layer with a film thickness of 20 μm or more, composed of a polyimide resin, which is provided on the adhesion layer,
wherein, in the adhesion layer, the content rate of a total formula weight of an imide structure represented by Formula (a) in a polyimide resin skeleton is 27% or more and 33% or less;
wherein, in the polyimide resin of the insulating layer, the content rate of a total formula weight of the imide structure in a polyimide resin skeleton is more than 27% and 37% or less:
and
wherein the insulating layer is composed of two or more layers, and a difference in the content rate of the total formula weight of the imide structure between insulating layers adjacent to each other is from 4.0 to 10.0%.
2. The insulated wire according to claim 1 , wherein a difference in the content rate of the total formula weight of the imide structure between the adhesion layer and the insulating layer is from 4.0 to 10.0%.
3. The insulated wire according to claim 1 , wherein a difference in the content rate of the total formula weight of the imide structure between the adhesion layer and the insulating layer is from 4.0 to 10.0%, and the content rate of the total formula weight of the insulating layer is greater than the adhesion layer.
4. The insulated wire according to claim 1 , wherein the polyimide resin has a partial structure represented by Formula (1):
5. The insulated wire according to claim 1 , further comprising a reinforcing insulating layer composed of a thermoplastic resin, wherein the thermoplastic resin contains at least one kind of resin selected from a polyetherether ketone resin and a polyphenylene sulfide resin.
6. A coil, which is obtained by winding working the insulated wire according to claim 1 .
7. An electric or electronic equipment, comprising the coil according to claim 6 .