Patent ID: 6222132
Filing Date: 2001-04-24
Classification: H01B,H01F

Abstract:
A multilayer insulated wire comprising a conductor and solderable extrusion-insulating layers made up of two or more layers for covering the conductor, wherein at least one of said insulating layers including the outermost layer is made of a mixture comprising 100 parts by weight of resin components, said mixture 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 at least one inorganic filler (B) selected from the group consisting of titanium oxide, silica, alumina, zirconium oxide, barium sulfate, clay, and talc, the multilayer insulated wire being formed by a method comprising forming the at least one of said layers including the outermost layer by extrusion-coating of the mixture made by mixing the thermoplastic polyester-series resin (A), the ethylene-series copolymer having a carboxylic acid component or the metal salt of the carboxylic acid component on its side chain, and the inorganic filler (B), wherein the thermoplastic polyester-series resin (A), the ethylene-series copolymer, and the inorganic filler (B) are kneaded into a mixture after the water content of each of the thermoplastic polyester-series resin (A), the ethylene-series copolymer, and the inorganic filler (B) is brought to 0.02% by weight or less, and the resulting mixture is extruded onto the outside of the conductor to form the at least one insulating layer with the water content of the resulting mixture being 0.02% by weight or less.