An electrical cable comprising four copper layers, where at least two of the four copper layers are separated by a polymeric base layer, and where at least two of the four copper layers are separated by an adhesive. The electrical cable further comprising a polymeric cover layer adhered to an outermost copper layer

An insulated wire having at least one layer of coating of the wire, comprising a thermosetting resin layer, at the outer periphery of a conductor, wherein the thermosetting resin layer is comprised of thermosetting resin layers having a laminated structure formed by coating and baking a thermosetting resin varnish; and wherein, in said laminated structure, an innermost layer having contact with the conductor comprises a thermosetting resin having an imide bond and is a layer having an average thickness of more than 5 μm and 10 μm or less; a method of producing the insulated wire; a coil; a rotating electrical machine; and an electrical or electronic equipment.

Provided is an electrodeposition dispersion including a polyamide-imide resin, a polar solvent, water, a poor solvent, and a base, in which the polar solvent is an organic solvent having a boiling point of higher than 100° C. and D.sub.(S-P) represented by a formula (1) satisfying a relationship of D.sub.(S-P)<6, and a weight-average molecular weight of the polyamide-imide is 10×10.sup.4 to 30×10.sup.4 or a number-average molecular weight of the polyamide-imide is 2×10.sup.4 to 5×10.sup.4.
D.sub.(S-P)=[(dD.sup.S−dD.sup.P).sup.2+(dP.sup.S−dP.sup.P).sup.2+(dH.sup.S−dH.sup.P).sup.2].sup.1/2  (1)

An insulated wire containing a thermoplastic resin layer (A) as a covering layer directly or indirectly on a rectangular conductor, in which the insulated wire has at least one protruding part which is continuous in a longitudinal direction of said insulated wire, on a surface of a portion of the thermoplastic resin layer (A), which portion corresponds to at least one side of a cross-section of the insulated wire, said protruding part and a flat part of the surface having the protruding part forms a curved portion with a radius of curvature of 0.01 to 0.75 mm in the cross-section of the insulated wire, and a lateral face of the protruding part has a slope of less than 90° to the flat part of the surface having the protruding part in the cross-section of the insulated wire, a coil produced by processing the insulated wire by winding, and an electric/electronic equipment comprising the coil.

A polyimide precursor solution includes: a polyimide precursor; polyester resin particles containing a polyester resin and having a volume average particle diameter of from 3 μm to 50 μm inclusive and an average circularity of 0.970 or more; and a solvent.

An insulated wire including: a conductor; and an insulating film provided on an outer periphery of the conductor, wherein the insulating film satisfies the following relation between a relative permittivity (ε) of the insulating film at 0.2 atm and a relative permittivity (ε.sub.0) of an outermost layer of the insulating film at 0.2 atm.

ε≤3.0 and ε.sub.0/ε≥1.2.

Magnet wire with corona resistant enamel insulation may include a conductor, and at least one layer of polymeric enamel insulation may be formed around the conductor. The polymeric enamel insulation may include a filler dispersed in a base polyimide material. Additionally, the polymeric enamel insulation may have a thermal index of at least 260° C.

The present invention relates to a polyamideimide composition that is highly suitable for use as primary insulation for wires. The composition comprises from 55 to 65 pbw of N-n-butyl pyrollidone, from 25 to 40 pbw of polyamideimide resin, from 0 to 20 pbw of other components, wherein the polyamideimide resin has a Mw of between 10000 to 40000 g/mol (Dalton) and a Mw/Mn ratio between 1,1 and 2.

A method for manufacturing a patterned polyimide aerogel film on a substrate includes: dispensing a polyimide prepolymer sol onto a first portion of a surface of a substrate, a second portion of the surface of the substrate being substantially free of the polyimide prepolymer sol; forming a patterned film of a polyimide prepolymer gel on the substrate from the polyimide prepolymer sol; drying the polyimide prepolymer gel to form a patterned film of a polyimide prepolymer aerogel on the substrate; and curing the polyimide prepolymer aerogel on the substrate to form the patterned polyimide aerogel film on the first portion of the surface of the substrate, the second portion of the surface of the substrate being substantially free of the patterned polyimide aerogel film.

The present disclosure provides for a coating composition for forming a coating on a wire. The coating composition includes a polyamide-imide resin, a polyimide resin, a polyesterimide resin, or any two or more of these resins and one or more caprolactam-derived solvents. The present disclosure also provides for a method of producing a coating composition for forming a coating on a wire. The method includes providing a polyamide-imide resin, a polyimide resin, a polyesterimide resin, or any two or more of these resins and one or more caprolactam-derived solvents, and mixing the polyamide-imide resin, the polyimide resin, the polyesterimide resin, or the two or more of these resins and the one or more caprolactam-derived solvents until the polyamide-imide resin, the polyimide resin, the polyesterimide resin, or the two or more of these resins is in solution with the one or more caprolactam-derived solvents to produce the coating composition.