Westinghouse Electric Corporation

William S Gorton, Jr

Richard D Buckley

Frank A Sattler

Disclosed is a UV-curable coating composition and method of preparing it, a method of coating a conductor with it, and the resulting coated conductor. The composition comprises about 20 to about 40% by weight of an acrylated epoxy which is the reaction product of an epoxy resin and an acrylate adduct. The acrylate adduct is the reaction product of an acrylate which may be either 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxyethyl methacrylate or mixture thereof, and either an anhydride or a diisocyanate. The anhydride may be phthalic anhydride, maleic anhydride, trimellitic anhydride, or mixtures thereof. The diisocyanate can be toluene diisocyanate, 4,4'-diisocyanato diphenyl methane, or mixtures thereof. The composition also includes about 4 to about 15% by weight of an acrylated blocked isocyanate which is the reaction product of caprolactam and an acrylated isocyanate. The acrylated isocyanate is the reaction product of an acrylate which can be 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxyethyl methacrylate, or mixtures thereof, with an isocyanate which can be toluene diisocyanate, 4,4'-diisocyanato diphenyl methane, or mixtures thereof. The composition also includes about 45 to about 65% by weight of a mono-acrylate of which at least 60% by weight is phenoxyethyl acrylate, about 5 to about 20% by weight of a polyacrylate of which at least about 50% is triethylene glycol diacrylate, about 2 to about 5% of a photoinitiator, and about 0.05 to about 0.3% by weight of an inhibitor.

UV Curable composition and coil coatings

Electrical winding assembly constructed by (A) winding an electrical conductor into a plurality of radially-spaced layers about an axis, (B) disposing electrical insulating sheet material, which has dry, heat-reactive resin material disposed at discrete areas on at least one side thereof, between the layers of the electrical conductor, (C) applying a slurry formed of solid, heat-reactive resin particles suspended in a non-aqueous liquid carrier, wherein the liquid is chemically inert for the resin particles suspended therein so as not to dissolve or enter into a reaction with the resin, at predetermined locations between certain of the layers of the electrical insulative material and the electrical conductor and (D) heating the electrical winding assembly at a predetermined temperature for a predetermined period of time sufficient to volatize the non-aqueous liquid carrier and to cause the resin on the electrical insulative material and in the slurry to soften and form cohesive bonds between adjacent layers of the electrical insulative material and the electrical conductor as it polymerizes to a solid state.

Growing community of inventors

Athens, GA, United States of America

William S Gorton, Jr