Polyimide enamels, Insulation

The initial applications of polyimldes were as varnishes and overcoat enamels as wire Insulation. Polyimldes provided significant Improvement in high temperature cut through resistance as well as excellent dielectric properties. They continue In use today both as homopolymers and copolymers with amides and ester moieties. Paralleling this technology was the development by duPont of Kapton polyimide film. Kapton enjoys a strong position as a class 22 f organic film. These applications represent the major portion of polyimide consumption. 

The first application of polyimides was for wire enamel. Applications for polyimides include bearings for appliances and aircraft, seals, and gaskets. Film versions are used in flexible wiring and electric motor insulation. Printed circuit boards are also fabricated with polyimides/ ... 

Uses. Polyimide coatings are used in electrical applications as insulating varnishes and magnet wire enamels in high-temperature, high-reliability applications. They are also used as alternatives to fluorocarbon coatings on cookware, as shown in Fig. 10.5. 

Fine metal wires may be directly integrated into the fabric or yam stracture. In some applications, there is a need to insulate the wires. This can be achieved by the application of an insulated coating. For example, Elektrisola Feindraht (2014) markets enamelled copper wire with coatings of polyurethane, polyesterimide, poly-amidimide and polyimide. 

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