Insulated wire, coil and electric or electronic equipment

Patent metadata

Field	Value
Publication number	US-10504636-B2
Application number	US-201816001205-A
Country	US
Kind code	B2
Filing date	Jun 6, 2018
Priority date	Dec 8, 2015
Publication date	Dec 10, 2019
Grant date	Dec 10, 2019

Abstract

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.

First claim

The invention claimed is:

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 .

Assignees

• Furukawa Electric Co Ltd
• Furukawa Magnet Wire Co Ltd

Inventors

• Oya Makoto

Classifications

• H01B7/02 Primary

  Disposition of insulation · CPC title

• H01F5/06

  Insulation of windings · CPC title

• H01B3/306

  Polyimides or polyesterimides · CPC title

• H01B3/427

  Polyethers · CPC title

• H01B7/0216 Primary

  Two layers · CPC title