SYNTHETIC FIBER TREATMENT AGENT AND APPLICATION THEREFOR

摘要

Provided is a synthetic fiber treatment agent capable of providing drop-off preventive properties of a fiber oligomer in a synthetic fiber production step. Provided is a synthetic fiber treatment agent containing an ester compound (A) being at least one compound selected from an alditol fatty acid ester compound (A1) and an ester compound of dianhydride alditol and a fatty acid, and a smoothing agent (B), wherein the total weight percentage of the compound (A) and the smoothing agent (B) with respect to the non-volatile content of the treatment agent is 3-90 weight%, the hydroxyl value of the alditol constituting the compound (A1) is 5 or more, and the kinematic viscosity of the non-volatile content of the treatment agent at 25°C is 100-250 mPa∙s.