Method for manufacturing synthetic fiber treatment agent, synthetic fiber treatment agent, synthetic fiber, and method for manufacturing synthetic fiber

摘要

PROBLEM TO BE SOLVED: To preferably suppress fluff in a spinning process. SOLUTION: This is a method for producing a synthetic fiber treatment agent having a boron content of 200 ppm or less detected from the non-volatile content of the synthetic fiber treatment agent by ICP emission spectrometry, and the catalyst having a boron atom in the molecule. In the presence of the addition step, alkylene oxide is added to alcohol to prepare a (poly) oxyalkylene derivative, and the content of boron detected from the non-volatile content of the synthetic fiber treatment agent by ICP emission spectrometry is 200 ppm or less. It has a removal step of removing the catalyst so as to be. [Selection diagram] None