Multilayer insulated wire and transformer made by using the same

摘要

There is disclosed a multilayer insulated wire which comprises a conductor and solderable extrusion-insulating layers made up of two or more layers for covering the conductor, wherein at least one insulating layer including the outermost layer is formed by a mixture that comprises 100 parts by weight of resin components in which 100 parts by weight of a thermoplastic polyester-series resin (A) is blended with 5 to 40 parts by weight of an ethylene-series copolymer having a carboxylic acid component or a metal salt of the carboxylic acid component in its side chain, and 10 to 80 parts by weight of an inorganic filler (B). There is also disclosed a transformer which utilizes the multilayer insulted wire. The multilayer insulated wire is excellent in solderability, high-frequency characteristic, property to prevent scraping off of an insulating coating under high-voltage and high-frequency, and coilability, and it is favorably suitable for industrial production. Further, the transformer utilizing the multilayer insulated wire is excellent in electrical properties and high in reliability, since when used at high frequencies, there arises no problem of lowering of electric properties and scraping-off from the wire by corona.