| 摘要 |
The present invention provides a copolyester fiber consisting of a copolyester with primarily C2-4 alkylene terephthalate units and a process for producing these copolyester fibers. The copolyester contains more than 4 wt % up to 12 wt % poly(C2-4 alkylene glycol) units and 60 to 260 ppm pentaerythritol units and/or a total of 150 to less than 2500 ppm carboxy methylene phosphonic acid units and/or carboxy ethylene phosphonic acid units polymerized into it.
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