# US 10,504,636 B2 · Insulated wire, coil and electric or electronic equipment

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- Number: US 10,504,636 B2
- Document ID: US10504636B2
- Status: Granted
- Kind: B2
- Application number: 16/001,205
- Filed: 2018-06-06
- Published: 2018-10-04
- Granted: 2019-12-10
- Earliest claimed: 2015-12-08
- Assignees: Furukawa Electric Co., Ltd.; Furukawa Magnet Wire Co., Ltd.
- Applicants: Furukawa Electric Co., Ltd.; Furukawa Magnet Wire Co., Ltd.
- Inventors: Makoto Oya
- Web page: https://patentgrep.com/patent/US10504636B2

## CPC

- H01B 7/0216: {Two layers}
- H01B 3/30: plastics; resins; waxes
- H01B 3/301: {Macromolecular compounds obtained by reactions forming a linkage containing sulfur with or without nitrogen, oxygen or carbon in the main chain of the macromolecule, not provided for in group H01B3/302}
- H01B 3/306: {Polyimides or polyesterimides}
- H01B 3/427: {Polyethers}
- H01B 7/02: Disposition of insulation
- H01F 5/06: Insulation of windings
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## 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.

## Claims

### Claim 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%.

### Claim 2 (depends on 1)

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%.

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 1)

The insulated wire according to claim 1, wherein the polyimide resin has a partial structure represented by Formula (1):

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

A coil, which is obtained by winding working the insulated wire according to claim 1.

### Claim 7 (depends on 6)

An electric or electronic equipment, comprising the coil according to claim 6.