Heat resistant resin and process for producing the same

An insulated wire comprising a coating of a heat resistant resin composition on an electric conductor;

• said heat resistant resin composition comprising a heat resistant resin and a phenolic solvent;
• the heat resistant resin being produced by reacting with heating
• (A) a polyamideimide resin obtained by reacting in a phenolic solvent the following components (a) to (e):
• (a) a polyisocyanate containing an isocyanurate ring in an amount of 0 to 30 equivalent percents based on the total isocyanate equivalent,
• (b) a diisocyanate free of an isocyanurate ring,
• (c) a lactam,
• (d) a tricarboxylic acid anhydride, and
• (e) a compound different from the component (d) and selected from the group consisting of trimesic acid, tris(2-carboxyethyl) isocyanurate, 3,3',4,4'-butanetricarboxylic acid, anhydrides thereof and a reaction product of trimellitic anhydride and a trimer of isophorone diisocyanate or a trimer of tolylene diisocyanate, in an amount of 0 to 30 equivalent percents based on the total carboxyl equivalent, with
• (B) an alcohol component selected from the group consisting of a di- or higher polyhydric alcohol and a mixture of a di- or higher polyhydric alcohol with a monohydric alcohol, and
• (C) an acid component selected from the group consisting of a divalent or higher polyvalent carboxylic acid, an ester thereof and an anhydride thereof.