HIGH TEMPERATURE RESISTANT FAST SOLDERING WIRE ENAMEL

摘要

The presentinvention relates to electrical insulating wire enamels which give high temperature resistance as well as fast soldering capability to a magnet wire when it is coated (insulated) by this enamel which is a polyurethane wire enamel composition comprising a mixture of (a) a blocked isocyanate and (b) polyesterimide resin, wherein said polyesterimide resin (b) comprises (i) units of a polyester of alcohols and at least one carboxylic acid and (ii) diimide dicarboxylic acid units, said alcohols including at least one alcohol which contains isocyanurate groups, and wherein said blocked isocyanate (a) is prepared from an isocyanate selected from the group consisting of diphenylmethane diisocyanate, diphenyl sulfone diisocyanate, and diphenyl ether diisocyanate or a urethane polymer derived by reaction of said isocyanate with an alcohol.