Electrical insulating coatings

摘要

A polyester resin, polyester-imide resin or polyester-amide-imide resin dissolved in a solvent containing 60% by weight or more of at least one polyhydric alcohol derivative selected from the group consisting of R1COO(CHR2CH2O)nH, R1COO(CHR2CH2O)nCOR3, R1O(CHR2CH2O)nCOR3 and R1O(CHR2CH2O)nR4, wherein R1, R3 and R4 are independently lower alkyl, aryl or aralkyl; R2 is hydrogen or methyl; and n is an integer of 1 to 3, gives an electrical insulating coating having excellent storage stability and high resin concentration without causing defects of phenols when used as a solvent.