| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester fiber excellent in dyeability and anti-pilling to a cationic dye under normal pressure.SOLUTION: The polyester fiber is obtaining by dispersing a phosphorus containing polymer (B) in a polyester (A) consisting of a dicarboxylic acid component and a glycol component. The dicarboxylic acid component includes: 75 mol% or more of a terephthalic acid component; 1.0-3.5 mol% of a component (a) derived from a compound represented by the following formula (I); 2.0-10.0 mol% of a cyclohexanedicarboxylic acid component (b); and 2.0-8.0 mol% of an aliphatic dicarboxylic acid component (c). ( where, in the following formula (I), R represents hydrogen, a 1-10C alkyl group or a 2-hydroxyethyl group, and X represents a metal ion, a quaternary phosphonium-ion or a quaternary ammonium ion.) |
