Insulated wire

Patent metadata

Field	Value
Publication number	US-9601238-B2
Application number	US-201514597371-A
Country	US
Kind code	B2
Filing date	Jan 15, 2015
Priority date	Jan 17, 2014
Publication date	Mar 21, 2017
Grant date	Mar 21, 2017

Abstract

According to one embodiment, an insulated wire is disclosed. The wire includes a conductor and an insulating film formed on the conductor, the insulating film including a first layer of a first polyamideimide containing an adhesion improver; a second layer of a second polyamideimide 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 obtained by reacting an acid component containing 50 to 90 mol % of 3,3′,4,4′-biphenyl tetracarboxylic dianhydride, 5 to 20 mol % of 3,3′,4,4′-benzophenonetetracarboxylic dianhydride and 5 to 40 mol % of pyromellitic anhydride with a diamine component containing 4,4′-diaminodiphenyl ether.

First claim

What is claimed is:

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 90 mol % of 3,3′,4,4′-biphenyl tetracarboxylic dianhydride, 5 to 20 mol % of 3,3′,4,4′-benzophenonetetracarboxylic dianhydride and 5 to 40 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%.

2. The insulated wire according to claim 1 ,
wherein the acid component of the third layer contains 60 to 70 mol % of 3,3′,4,4′-biphenyl tetracarboxylic dianhydride, 10 to 15 mol % of 3,3′,4,4′-benzophenonetetracarboxylic dianhydride and 25 to 30 mol % of pyromellitic anhydride.

3. The insulated wire according to claim 1 ,
wherein, the second layer is 55 to 75%, and the third layer is 15 to 30%.

4. The insulated wire according to claim 1 ,
wherein a glass transition point (Tg) of the second polyamideimide is 200 to 270° C.

5. The insulated wire according to claim 1 ,
wherein the total thickness of the insulating film is 60 to 200 μm.

6. The insulated wire according to claim 1 ,
wherein the conductor is a rectangle conductor.

7. The insulated wire according to claim 6 ,
wherein the rectangle conductor has a rectangular cross section of 2.0 to 7.0 mm in width and 0.7 to 3.0 mm in height.

Assignees

• Denso Corp
• Unimac Ltd

Inventors

• Amano Yuki
• Sugiura Shinsuke
• Hirai Kazuomi
• Nakane Yumi
• Narita Masatoshi
• Hirano Tatsumi
• Kanemitsu Futoshi
• Ashida Yasunari

Classifications

• H01B7/292 Primary

  using material resistant to heat · CPC title

• H01B7/28

  {Protection against damage caused} by moisture, corrosion, chemical attack or weather · CPC title

• Y10T428/2933

  Coated or with bond, impregnation or core · CPC title

• H01B3/306

  Polyimides or polyesterimides · CPC title

• Y10T428/269

  including synthetic resin or polymer layer or component · CPC title