Normal pressure cation dyeable polyester flat fiber and fabric using it

摘要

PROBLEM TO BE SOLVED: To provide a normal pressure cation dyeable polyester flat fiber capable of obtaining a cloth having excellent dyeability, glossy feeling and elasticity. Further, the present invention provides a fabric having excellent dyeability, a glaring luster, and a firmness. A poly (polyester) having a main repeating unit of ethylene terephthalate, containing 2.0 to 3.0 mol% of a metal sulfonate group-containing isophthalic acid component with respect to the acid component of the entire polyester, and having an average molecular weight of 150 to 400. It is made of polyester containing alkylene glycol in a proportion of 2.0 to 3.5% by mass with respect to the entire polyester, and the cross-sectional shape of the fiber exhibits a flat cross-sectional shape having no unevenness on the fiber surface in the major axis direction. A normal pressure cation dyeable polyester flat fiber characterized by an aspect ratio of 4.0 to 6.0 in the cross section of the fiber and a single yarn fineness of 9 to 15 dtex. A woven fabric using the atmospheric pressure cationic dyeable polyester flat fiber. [Selection diagram] Fig. 1