Sumitomo Electric Industries, Limited

Sumito Electric Industrial Co., Ltd.

Hirohiko Nakabayashi

Munetaka Kawaguchi

Masayoshi Miyake

Teruyuki Yamamoto

Waichiro Kozen

Akihisa Takeuchi

Isao Ueoka

A polyurethane magnet wire comprising a conductor having provided thereon a polyurethane insulation coating, wherein the total amount of the phenolic compounds contained in organic compounds which evaporate from said coating by heating at 280.degree. C. for 2 minutes is 0.2 wt% or less based on the weight of the coating and the total amount of the organic compounds is 2 wt% or less based on the weight of the coating; and an electric relay comprising such a wire.

Magnet wire and electromagnetic relay using the same

A polyurethane magnet wire comprising a conductor having provided thereon a polyurethane insulation coating, wherein the total amount of the phenolic compounds contained in organic compounds which evaporate from said coating by heating at 280.degree. C. for 2 minutes is 0.2 wt % or less based on the weight of the coating and the total amount of the organic compounds is 2 wt % or less based on the weight of the coating; and an electric relay comprising such a wire.

An enameled wire which can be safely used for electric machinery such as an electric motor and transformer without causing smoking or fire accidents comprising a conductive wire coated with a thermoplastic straight chain polyurethane having therein the following repeating unit ##STR1## wherein R and R' each represents a divalent group having at least 2 carbon atoms.

Enameled wires

An enamelled wire comprising a layer of baked insulation formed on the conductor either directly or through another insulation can be produced by applying to at least the outermost layer of the wire a wire enamel composition consisting essentially of a polyester resin at least one molecule of which is terminated with a straight alkyl group having 21 or more carbon atoms, and drying the same.

Enamelled wire

A magnet wire comprising a conductor having thereon an outermost insulating wire enamel layer, either directly or over another insulating layer, said wire enamel consisting essentially of a polyamideimide wherein either one or both ends of at least one polyamideimide molecule is a terminal linear alkyl group having at least 21 carbon atoms. The magnet wire has a high resistance to refrigerant as well as to thermal or mechanical damage and has a high lubricity.

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Aichi, Japan

Hirohiko Nakabayashi