| abstract |
A surface having an intrinsic viscosity of 0.85 or more, having ethylene terephthalate as the main repeating unit, having an amount of terminal carboxyl groups in the fiber of 20 equivalents / ton or more, a long period of 9 to 12 nm by X-ray incineration diffraction, and an epoxy group on the fiber surface It is a polyester fiber for rubber reinforcement with the processing agent attached. Moreover, the manufacturing method melt-discharges the polyethylene terephthalate polymer whose intrinsic viscosity is 0.9 or more and terminal amount of carboxyl groups is 15 equivalent / ton or more, and after providing the spinning emulsion containing an alkaline curing catalyst, the speed | rate of 2000-6000 m / min. It is a manufacturing method of the polyester fiber obtained by pulling in, and extending | stretching then, giving the finishing oil containing an epoxy compound, and carrying out aging treatment. |