METHOD FOR PRODUCING POLYIMIDE FIBER

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a polyimide fiber which can provide a polyimide fiber having excellent characteristics such as thermal resistance and is low in production cost and low in environmental load, and to provide a polyimide precursor solution and a polyimide precursor fiber used for the same.SOLUTION: The method for producing a polyimide fiber comprises: obtaining a polyimide precursor fiber by spinning using a polyimide precursor solution; and imidizing the obtained polyimide precursor fiber, in which a) the polyimide precursor is a polyamide acid having a carboxylate structure in a part of the molecular structure and b) the solution viscosity of the polyimide precursor solution is 0.1 to 170 Pa s at 30°C.