| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide: a polyester fiber exhibiting deep color property to a cationic dye and a disperse dye in normal pressure atmosphere, excelling in washing fastness and fastness to light, and having dyeability under normal pressure; and a polyester fiber securing excellent dyeability and thread quality even to a combine filament with a material other than the polyester fiber, being excellent in anti-transparent property, having feeling excellent in bulkiness, bulge, tension, and drape, and forming a light and opaque knitted fabric. <P>SOLUTION: The polyester fiber has a cross-sectional shape including irregular cross-sections A-D, and is composed of not less than three copolymerization constituents. The polyester fiber includes a dicarboxylic acid component, not less than 75 mol% of which is terephthalic acid and/or an ester forming derivative thereof, and the polyester fiber is obtained by copolymerizing as copolymerization constituents (A) 1.0-3.5 mol% of a metal salt of sulfoisophthalic acid, (B) 2.0-10 mol% of cyclohexanedicarboxylic acid and/or an ester forming derivative thereof, and (C) 2.0-8 mol% of an aliphatic dicarboxylic acid and/or an ester forming derivative thereof. <P>COPYRIGHT: (C)2013,JPO&INPIT |
