SPIN FINISH OIL FOR POLYESTER SYNTHETIC FIBER, PROCESSING METHOD OF POLYESTER SYNTHETIC FIBER AND POLYESTER SYNTHETIC FIBER

摘要

This is to provide a spin finish oil for polyester synthetic fiber which simultaneously satisfies emulsification stability, heat resistance, antistatic property in the carding process of the spinning process and proof against scum deposition in the drawing process, and does not cause lowering in fiber strength with time, a processing method of polyester synthetic fiber using such a spin finish oil and a polyester synthetic fiber obtainable by such a processing method. This is to use the spin finish oil for polyester synthetic fiber comprising, with a ratio of, 40 to 80% by mass of a specific alkylphosphoric acid ester, 10 to 50% by mass of a specific surfactant and 0.01 to 10% by mass of a monovalent aliphatic alcohol having an alkyl group with 12 to 22 carbon atoms in the molecule (100% by mass in total).