US 12,106,868 B2
Insulated wire
Takahiro Iwamoto, Osaka (JP); Masaaki Yamauchi, Osaka (JP); and Hirotsugu Mochida, Koka (JP)
Assigned to SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP); and SUMITOMO ELECTRIC WINTEC, INC., Shiga (JP)
Appl. No. 17/925,671
Filed by SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP); and SUMITOMO ELECTRIC WINTEC, INC., Koka (JP)
PCT Filed May 2, 2022, PCT No. PCT/JP2022/019515
§ 371(c)(1), (2) Date Nov. 16, 2022,
PCT Pub. No. WO2023/026591, PCT Pub. Date Mar. 2, 2023.
Claims priority of application No. 2021-136332 (JP), filed on Aug. 24, 2021.
Prior Publication US 2024/0145116 A1, May 2, 2024
Int. Cl. H01B 3/00 (2006.01); H01B 3/30 (2006.01); H01B 17/62 (2006.01)
CPC H01B 3/303 (2013.01) [H01B 17/62 (2013.01)] 4 Claims
 
1. An insulated wire comprising: a linear conductor; and an insulating layer that covers an outer peripheral surface of the conductor, wherein
the insulating layer comprises, as residual solvents, a first solvent having a relative permittivity of 15 or more and a second solvent having a relative permittivity of less than 15,
a first ratio that is a ratio of a content of the second solvent to a total content of the first solvent and the second solvent contained in the insulating layer is 50% by mass or more,
a second ratio that is a ratio of the content of the second solvent to the total content of the first solvent and the second solvent contained in the insulating layer after a heating treatment of heating the insulated wire at 350° C. for 1 minute is higher than the first ratio,
the insulating layer comprises 5% by mass or less of the first solvent, and
the insulating layer comprises 0.1% by mass or more and 5% by mass or less of the second solvent.