Heat-resistant polyester magnet wire

THE INFLUENCE of chemical composition and structure on the mechanical properties and thermal stability of polymers has long been of great interest to the chemist. An outgrowth of such work in the General Electric Research Laboratory has been the synthesis of a completely organic polymer of the polyester class, a polymer shown by tests to be eminently suitable as a thin-film magnet wire insulation. Wire insulated with this polymer, which will be referred to as Alkanex¿ wire, possesses excellent initial properties important in manufacturing electrical equipment. Its thermal stability is such that it can be used at class B, 130 degrees centigrade (C), and higher operating temperatures in long-lived electric apparatus.