Ist Corporation, Limited

Ryuta Nakagaki

Koji Moriuchi

Katsuki Morishima

The method for producing a polyimide fiber includes a coagulation step of forming a polyimide precursor fiber by extruding a polyimide precursor solution containing a polyimide precursor and a compound having an acid dissociation constant (pKa) of a conjugate acid in water at 25&#xb0; C. of 6.0 to 10 inclusive and an octanol-water partition coefficient (Log P) at 25&#xb0; C. of &#x2212;0.75 to 0.75 inclusive into a poor solvent or nonsolvent for the polyimide precursor; and a heat drawing step of forming the polyimide fiber by drawing the polyimide precursor fiber while heating same. The polyimide fiber of the present disclosure has a physical property such that the coefficient of thermal expansion thereof is in the range of &#x2212;15 ppm/K to 0 ppm/K inclusive.

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Shiga, Japan

Ryuta Nakagaki