POLYIMIDE RESIN VANISH, AND INSULATED ELECTRIC WIRE, ELECTRIC COIL AND MOTOR USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a polyimide resin vanish, which suppresses the viscosity rise accompanying sharp high molecularization of a polyimide precursor (polyamic acid) and allows reduction of the synthetic reaction time in a reaction to obtain the polyimide precursor resin by reacting an aromatic tetracarboxylic dianhydride with an aromatic diamine in an organic solvent.

SOLUTION: The method for producing a polyimide resin vanish obtains a solution containing a polyimide precursor resin (polyimide resin vanish) by reacting an aromatic tetracarboxylic dianhydride with an aromatic diamine in an organic solvent, wherein a monocarboxylic anhydride or a monoamine is used as a terminal blocking agent; in the case where a terminal blocking agent is a monocarboxylic anhydride, the terminal blocking agent is made to be present in ≥0.1 mol% and ≤5 mol% for the reaction with respect to the total amount of the aromatic tetracarboxylic dianhydride, and in the case where being a monoamine, the terminal blocking agent is made to be present in the same mol% range as above with respect to the total amount of the aromatic diamine.

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