Abstract: A new insulated wire resists heat cycles under severe operating ambient temperatures without reducing the lifetime of coils in which the insulated wire is used. The insulated wire has on the insulating coating a fluororesin coating without or with a binder constituting 20 wt. % or less. The fluororesin coating comprises fluororesin such as polytetrafluoroethylene, a tetrafluoroethylene-perfluoroalkylvinylether copolymer, or a fluoroethylene-propylene copolymer.

Abstract: An insulated wire having excellent fabricability causing no cracking in the film even after severe winding or rolling fabrication and also having heat resistance comparable to that of polyamideimide is disclosed, in which a first insulation layer of a thermosetting resin composition having a Tg of 250° C. or higher is formed on a conductor, on which a second insulation layer formed of a mixture of a thermosetting resin composition having a Tg of 250° C. or higher and a thermoplastic resin composition having a Tg of 140° C.

Abstract: The present invention provides a wire saw for use in cutting works of electronics materials or optical materials and a method for manufacturing the same, said wire saw having the following characteristic features. Namely, onto a high-strength core wire 2, abrasive grains 3 having a grain size not smaller than two-thirds the thickness of a layer of resin bond 4 on said core wire 2 but not exceeding a half the diameter of said core wire are fixed with said resin bond, said resin bond containing a filler having a grain size smaller than two-thirds the thickness of said resin bond layer. The thus structured and arranged wire saw has an improved efficiency and precision in cutting. The wire saw can be manufactured readily by using an enamelling oven.

Abstract: An insulated wire having as components a conductor, a first insulating layer on the conductor, and a second insulating layer which comprises a coating resin having a glass transition temperature of between 100 and 250.degree. C. after baking and a lubricant and has a thickness of 0.005 mm or less, which has good lubricity and resistance to processing.

Abstract: An insulated wire comprising a conductor and an insulating coating which has a tensile strength of at least 13 kg/mm.sup.2 and a Young's modulus of at least 270 kg/mm.sup.2, which has good flexibility and resistance to flaw.

Abstract: An insulated wire comprising a conductor and an insulating coating made from a polyamideimide base coating, which polyamideimide is made of an acid component and a diisocyanate component containing 10 to 80 % by mole of an aromatic diisocyanate compound of the formula: ##STR1## or which polyamideimide is made of an diisocyanate component and an imidodicarboxylic acid that is a reaction product of an acid component and a diamine component, in which the diamine component contains an aromatic diamine compound of the formula: ##STR2## and/or the diisocyanate component contains the above aromatic diisocyanate compound in such an amount that a total amount of the aromatic diamine compound and the diisocyanate compound is from 10 to 80 % by mole based on the total amount of the whole diamine component and the whole diisocyanate component.

Abstract: A self-bonding insulated wire and a coil formed therefrom are disclosed, which wire comprising a first fusion-bonding film comprising a polyhydroxyether resin having a glass transition temperature of not lower than 90.degree. C. provided on an insulating film on a conductor; and a second fusion-bonding film comprising a polyamide copolymer resin having a melting point of from 50.degree. to 150.degree. C. provided further thereon, the second fusion-bonding film comprising the polyamide copolymer resin making up from 5% to 40% by film thickness of the entire fusion bonding films.

Abstract: An insulated wire comprising a conductor coated and baked thereon with an insulating lacquer, the insulating lacquer comprising (a) 100 parts by weight of a polyamideimide resin having a molecular weight corresponding to a reduced specific viscosity of from 0.1 to 1.0, and (b) 75 to 400 parts by weight of a stabilized polyisocyanate compound derived from diphenylmethane-diisocyanate.

Abstract: A process for producing an insulating twisted electric wire having a reduced overall diameter with an insulating coating of high quality. The insulating coating has a thickness in a range of 3 to 100% of the radius of a smallest circle circumscribing the assembled set of twisted conductors. The insulating coating is formed by two or more cycles of coating and curing an insulating paint. Preferably, a bottom layer of the insulating coating is formed by applying a heat-curable insulating paint with a felt applicator or with a roller coating device. The heat-curable insulating paint should have a viscosity of not more than about 300 cps at 30.degree. C.

Abstract: 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.

Abstract: A self-bonding magnet wire comprising a conductor having a baked overcoat applied over another insulation layer is disclosed. Said overcoat is applied from an enamel composition consisting essentially of a polyhydroxyether or sulfonated polyhydroxyether having a straight alkyl group of 21 or more carbon atoms connected to a terminal or a side chain of at least one molecule of the polymer.

Abstract: A magnet wire comprising a layer of baked enamel formed on the conductor either directly or through another insulation is disclosed. At least the outermost layer of the wire has an insulation coating formed by applying and baking an enamel composition consisting essentially of a polyamide at least one molecule of which is terminated with a straight alkyl group having 21 or more carbon atoms.