INSULATING VARNISH Russian patent published in 1998 - IPC

FIELD: varnishes. SUBSTANCE: insulating varnish has 27-40 mas. p. ethylene glycol-base oligoetherisocyanurateimide, tris-(2-hydroxyethyl)-isocyanurate, dimethylterephthalate or its mixture with terephthalic acid at molar ratio (0.5-0.8):(0.2-0.5), trimellite anhydride and 4,4'-diaminodiphenylmethane taken at molar ratio (3.2-4.5):(1.3-2.0):1:(2.0-3.0):(1.0-1.5), respectively, and at acidic number 1-10 mg KOH/g, at hydroxyl groups amount 8.0-11.0%, and 59.20-72.46 mas. p. aromatic solvent, 0.54-0.80 mas. p. ortho-titanic acid alkylester. Varnish has a mixture of tricresol (or dicresol) as an aromatic solvent and solvent at mass ratio (3-4):1. Product is insulating varnish providing high temperature of insulation pressing through (320 C, not below) and temperature index 180, not less. EFFECT: improved quality of varnish. 3 tbl