| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyester fiber having good color tone, scarcely generating spinneret deposits even if continuously spun for a long time through a spinneret, having high performance of good formability, and having improved clearness, and to provide a method for producing the polyester fiber. SOLUTION: This polyester fiber is produced by the following process: in producing the polyester, a catalyst made from a specific titanium compound and a phosphorus compound is used, and at any stage prior to completing synthesizing the polyester, a metal-containing phosphorus compound and an alkaline earth metal compound are added to the polyester synthesis system without making a reaction between both the compounds in advance, and the resultant polyester polymer obtained by completing the synthesis is melt-spun into fiber, and thereafter, 2-40 wt.% of the resultant fiber is dissolved out by the aid of an aqueous solution of an alkaline compound to form micropores on the cross section of the fiber. |
