Low coefficient of friction magnet wire enamels
AssigneeEssex Group, Inc.
InventorsCharles W. McGregor, Melody L. Sutto
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Abstract
An improved thermally stable, lubricious magnet wire enamel is disclosed which is particularly suitable for use as an outermost insulating, lubricating layer on a magnet wire substrate. The enamel comprises the reaction product of a tri-basic acid anhydride, a diisocyanate and a polyfunctional organosiloxane. The coating has a coefficient of friction, after application to magnet wire, of less than 0.10. It is also substantially all polyfunctional organosiloxane reacted, i.e. substantially no polyfunctional organosiloxane is capable of being extracted from the cured coating with organic solvents.
Claims5
An electrical conductor coated with an insulating layer of magnet wire enamel comprising a polyamideimide consisting essentially of the reaction product of a tri-basic anhydride, a diisocyanate and polyfunctional organosiloxane, the polyfunctional organosiloxane being reacted into the polymer backbone prior to application to the electrical conductor, said polyorganosiloxane being present in an amount of about 0.5% to about 5% by weight based on the weight of the enamel, the enamel having a coefficient of friction, after application to magnet wire, of less than 0.10 and the polyfunctional organosiloxane component being substantially non-solvent extractable after application to the wire.
Dependencies are inferred from the claim text.