Patent ID: 8871343
Filing Date: 2014-10-28
Classification: C08K,C09D,H01B,Y10T

Abstract:
1. A partial-discharge-resistant insulating varnish, comprising: a polyamide-imide enamel varnish comprising a polyamide-imide resin and a solvent component used for a synthesis reaction of the polyamide-imide enamel varnish, the solvent component comprising 67% to 87% by weight of γ-butyrolactone and a balance consisting of 1) at least one of N-methyl-2-pyrrolidone and N,N-dimethylformamide, or 2) cyclohexanone and N,N-dimethylformamide; and an organo-silica sol comprising silica and a dispersion solvent component comprising at least one selected from the group consisting of γ-butyrolactone, benzyl alcohol and solvent naphtha, wherein a total amount of γ-butyrolactone comprised in the solvent component and the dispersion solvent component is 50% or more and less than 100% by weight relative to a total amount of the solvent component and the dispersion solvent component.