Fluorinated insulated electric wire

Patent metadata

Field	Value
Publication number	US-10347392-B2
Application number	US-201715429448-A
Country	US
Kind code	B2
Filing date	Feb 10, 2017
Priority date	Aug 27, 2014
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

An insulated electric wire comprising a conductor and an insulating layer covering the conductor, wherein the insulating layer comprises a fluorinated copolymer (A) having units based on tetrafluoroethylene and units based on a perfluoroalkyl vinyl ether, the content of the units based on a perfluoroalkyl vinyl ether is from 0.1 to 1.9 mol % to the total units in the fluorinated copolymer (A); MRF of the fluorinated copolymer (A) as measured by the method in accordance with ASTM D-3307 is at least 0.1 and less than 15; the melting point of the fluorinated copolymer (A) is at least 260° C.; and the ratio of the thickness Di of the insulating layer to the diameter Dc of the conductor (Di/Dc) is less than 0.5.

First claim

What is claimed is:

1. An insulated electric wire comprising a conductor and an insulating layer covering the conductor, wherein the insulating layer comprises a fluorinated copolymer (A) having units based on tetrafluoroethylene and units based on a perfluoroalkyl vinyl ether, the content of the units based on a perfluoroalkyl vinyl ether is from 0.1 to 1.9 mol % to the total units in the fluorinated copolymer (A); MFR of the fluorinated copolymer (A) as measured by the method in accordance with ASTM D-3307 is from 0.1 to less than 15; the melting point of the fluorinated copolymer (A) is at least 260° C.; and the ratio of the thickness Di of the insulating layer to the diameter Dc of the conductor (Di/Dc) is less than 0.5,
wherein
the surface roughness (Ra) of the insulating layer is at most 10 μm
the insulating layer comprising the fluorinated copolymer (A) directly covers the conductor; and
the insulating layer is formed by covering the conductor with a molten fluorinated copolymer (A) by means of an electric wire-extrusion molding machine provided with a die.

2. The insulated electric wire according to claim 1 , wherein the perfluoroalkyl vinyl ether is a perfluoropropyl vinyl ether.

3. The insulated electric wire according to claim 1 , wherein the surface roughness (Ra) of the insulating layer is at most 5 μm.

4. The insulated electric wire according to claim 1 , wherein the content of the units based on a perfluoroalkyl vinyl ether is from 1.0 to 1.9 mol % to the total units in the fluorinated copolymer (A).

5. The insulated electric wire according to claim 1 , wherein the ratio of the thickness Di of the insulating layer (Di/Dc) is at least 0.2 and less than 0.5.

6. The insulated electric wire according to claim 1 , wherein the ratio of the thickness Di of the insulating layer (Di/Dc) is at least 0.05 and at most 0.2.

7. The insulated electric wire according to claim 1 , which is used as a member for a vehicle.

8. A process for producing the insulated electric wire as defined in claim 1 , wherein the temperature of the die is at least 320° C. and less than 420° C.

9. The process according to claim 8 , wherein when draw downing the molten fluorinate copolymer (A) from the die to the conductor, the draw down ratio (DDR) is at least 5.0 and less than 180.

Assignees

• Agc Inc

Inventors

• Abe Masatoshi
• Sato Takashi
• Hosoda Tomoya

Classifications

• B29C48/34

  Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated · CPC title

• H01B3/441

  from alkenes · CPC title

• H01B3/445

  from vinylfluorides or other fluoroethylenic compounds · CPC title

• B29L2031/34

  Electrical apparatus, e.g. sparking plugs or parts thereof · CPC title

• B29C48/154

  Coating solid articles, i.e. non-hollow articles · CPC title