Varnish compositions for electrical insulation and method of using the same

A curable composition for electrically insulating a motor comprising:

• 10 to 45 weight percent of poly(phenylene ether) having the structural formula:
• wherein each occurrence of Q5 and Q6 is independently methyl or di-n-butylaminomethyl and herein n is a number providing an intrinsic viscosity of about 0.06 to 0.25 deciliter per gram, measured in chloroform at 25° C.;
• 30 to 50 weight percent of unsaturated polyester resin;
• 2 to 20 weight percent of polystyrene-block-poly(1,4-butadiene)-block-poly(methyl methacrylate)-block structure copolymer;
• 20 to 70 weight percent of reactive liquid monomer selected from the group consisting of vinyl toluene, styrene, t-butyl styrene, dibromostyrene, and combinations thereof;
• and
• 1 to 30 weight percent of the total composition of a multifunctional acrylate crosslinking agent.