INSULATED ELECTRIC WIRE

• US 20200135360A1
• Filed: 06/15/2018
• Published: 04/30/2020
• Est. Priority Date: 06/16/2017
• Status: Abandoned Application

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation), Sumitomo Electric Wintec, Inc. (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation), Sumitomo Electric Wintec, Inc. (Sumitomo Corporation)
• Inventors: MAEDA, Shuhei, YAMAUCHI, Masaaki, OTA, Shinya, SAITO, Hideaki, TAMURA, Yasushi, YOSHIDA, Kengo, HOMMA, Shigenori
• Application Number:
  US16/619,559
• Publication Number:
  US 20200135360A1
• Time in Patent Office: Days
• CPC Class Codes: C08G 73/10 Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
• CPC Class Codes: C08G 73/1067 Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
• CPC Class Codes: C09D 179/08 Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
• CPC Class Codes: H01B 3/306 Polyimides or polyesterimides
• CPC Class Codes: H01B 3/308 Wires with resins
• CPC Class Codes: H01B 7/02 Disposition of insulation
• CPC Class Codes: H01B 7/0208 Cables with several layers of insulating material
• CPC Class Codes: H01B 7/292 using material resistant to heat

Abstract

An insulated electric wire includes a linear conductor and an insulating film disposed to surround the periphery of the conductor. The insulating film includes a polyimide layer formed of a polyimide that has a molecular structure including a PMDA-ODA-type repeating unit A and a BPDA-ODA-type repeating unit B, the mole fraction [B×100/(A+B)] (% by mole) represented by the percentage of the number of moles of the repeating unit B to the total number of moles of the repeating unit A and the repeating unit B being 25% or more by mole and 95% or less by mole. The polyimide layer has a plurality of pores. The pores occupy 5% or more by volume and 80% or less by volume of the polyimide layer.

Claims

1. An insulated electric wire comprising:

a linear conductor; and

an insulating film disposed to surround the periphery of the conductor,

wherein the insulating film includes a polyimide layer formed of a polyimide that has a molecular structure including a repeating unit A represented by the following formula (1) and

2. The insulated electric wire according to claim 1, further comprising

a shell surrounding the pores.

3. The insulated electric wire according to claim 2, wherein

the shell has a higher elastic modulus than the polyimide.

4. The insulated electric wire according to claim 1, wherein

the insulating film includes a first layer that is in contact with the periphery of the conductor and that covers the periphery of the conductor,

the polyimide layer constitutes a second layer disposed to surround the periphery of the first layer, and

the first layer contains a resin with a storage modulus E′

of 200 MPa or more at 325°

C.

5. The insulated electric wire according to claim 4, wherein

the resin in the first layer contains at least one of poly ether ether ketone, polyamideimide, and polyimide having a molecular structure including the repeating unit A.

6. The insulated electric wire according to claim 4, wherein

the second layer has a thickness of 20 μ

m or more.

7. The insulated electric wire according to claim 4, wherein

the resin in the first layer has a storage modulus E′

of 20000 MPa or less at 325°

C.

8. The insulated electric wire according to claim 2, wherein

the insulating film includes a first layer that is in contact with the periphery of the conductor and that covers the periphery of the conductor,

the polyimide layer constitutes a second layer disposed to surround the periphery of the first layer, and

the first layer contains a resin with a storage modulus E′

of 200 MPa or more at 325°

C.

9. The insulated electric wire according to claim 3, wherein

the insulating film includes a first layer that is in contact with the periphery of the conductor and that covers the periphery of the conductor,

the polyimide layer constitutes a second layer disposed to surround the periphery of the first layer, and

the first layer contains a resin with a storage modulus E′

of 200 MPa or more at 325°

C.

10. The insulated electric wire according to claim 5, wherein

the second layer has a thickness of 20 μ

m or more.

11. The insulated electric wire according to claim 5, wherein

the resin in the first layer has a storage modulus E′

of 20000 MPa or less at 325°

C.

12. The insulated electric wire according to claim 6, wherein

the resin in the first layer has a storage modulus E′

of 20000 MPa or less at 325°

C.

13. The insulated electric wire according to claim 8, wherein

the resin in the first layer has a storage modulus E′

of 20000 MPa or less at 325°

C.