Insulated electric wire

Patent metadata

Field	Value
Publication number	US-9330814-B2
Application number	US-201313943185-A
Country	US
Kind code	B2
Filing date	Jul 16, 2013
Priority date	Jul 20, 2012
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

According to one embodiment, an insulated electric wire is disclosed. The insulated electric 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 react with an acid component formed on the first layer, and a third layer of a polyimide formed on the second layer.

First claim

What is claimed is:

1. An insulated electric wire, comprising:
a conductor and an insulating film formed 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 obtained by reacting an isocyanate component containing 2,4′-diphenylmethane diisocyanate, dimer acid diisocyanate and 4,4′-diphenyl methane diisocyanate with an acid component formed on the first layer, and a third layer of a polyimide formed on the second layer,
wherein the isocyanate component contains 10 to 70 mol % of 2,4′-diphenylmethane diisocyanate and dimer acid diisocyanate, and 30 to 90 mol % of 4,4′-diphenylmethane diisocyanate, and
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 electric wire according to claim 1 ,
wherein a glass transition point (Tg) of the first polyamideimide is 250 to 300° C.

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

4. The insulated electric wire according to claim 1 ,
wherein the isocyanate component contains 30 to 60 mol % of 2,4′-diphenylmethane diisocyanate and dimer acid diisocyanate.

5. The insulated electric wire according to claim 1 ,
wherein the acid component is selected from an aromatic tetracarboxylic acid dianhydride and an isomer thereof.

6. A insulated electric wire according to claim 1 ,
wherein the total thickness of the insulating film is 60 to 200 μm.

7. The insulated electric wire according to claim 1 ,
wherein the conductor is a rectangular conductor.

8. The insulated electric wire according to claim 1 ,
wherein the rectangular conductor has a rectangular cross section with a width of 2.0 to 7.0 mm and a height of 0.7 to 3.0 mm.

9. An insulated electric wire, comprising:
a conductor and an insulating film formed 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 obtained by reacting an isocyanate component containing 2,4′-diphenylmethane diisocyanate, dimer acid diisocyanate and 4,4′-diphenylmethane diisocyanate with an acid component formed on the first layer, and a third layer of a polyimide formed on the second layer,
wherein. the isocyanate component contains 10 to 70 mol % of 2,4′- diphenvlmethane diisocyanate and dimer acid diisocyanate, and 30 to 90 mol % of 4,4′-diphenvImethane diisocyanate, and
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 15 to 20%, the second layer is 55 to 75%, and the third layer is 15 to 30%.

10. The insulated electric wire according to claim 9 ,
wherein a glass transition point (Tg) of the first polvamideimide is 250 to 300° C.

11. The insulated electric wire according to claim 9 ,
wherein a glass transition point (Tg) of the second polvamideimide is 200 to 270° C.

12. The insulated electric wire according to claim 9 ,
wherein the isocyanate component contains 30 to 60 mol % in total of 2,4′-diphenylmethane diisocyanate and dimer acid diisocyanate.

13. The insulated electric wire according to claim 9 ,
wherein the acid component is selected from an aromatic tetracarboxylic acid dianhydride and an isomer thereof.

14. A insulated electric wire according to claim 9 ,
wherein the total thickness of the insulating film is 60 to 200 μm.

15. The insulated electric wire according to claim 9 ,
wherein the conductor is a rectangular conductor.

16. The insulated electric wire according to claim 9
wherein the rectangular conductor has a rectangular cross section with a width of 2.0 to 7.0 mm and a height of 0.7 to 3.0 mm.

Assignees

• Denso Coporation
• Unimac Ltd
• Denso Corp
• Unimac Ltd

Inventors

• Hisada tomokazu
• Amano Yuki
• Hirai Kazuomi
• Kawachi Yumi
• Narita Masatoshi
• Hirano Tatsumi
• Kanemitsu Futoshi
• Ashida Yasunari

Classifications

• H01B3/306 Primary

  Polyimides or polyesterimides · CPC title

• H01F27/2823

  Wires (H01F27/2866 takes precedence) · CPC title

• Y10T428/2933

  Coated or with bond, impregnation or core · CPC title

• H01B7/0225 Primary

  Three or more layers · CPC title

• H01B3/308

  Wires with resins · CPC title