| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for bath drawing of finely dividable conjugate fiber, enabling the high temperature bath drawing, the good staple drawing and the easy stable fine dividing of a conjugate fiber, which is difficult in bath drawing as it is, without lowering weak-alkali solubility when a conjugate fiber, composed of a weak-alkali-soluble component, is drawn in a bath and to produce a conjugate fiber capable of producing ultrafine fibers in an easy and stabile manner. SOLUTION: This finely dividable conjugate fiber is composed of constituting components mainly comprising terephthalic acid and ethylene glycol and a component comprising a weak-alkali-soluble polymer consisting of a copolymer ester containing 6-12mol% of 5-sodium sulfoisophthalic acid and 0-10mol% of isophthalic acid based on the total acid components. For drawing the finely dividable conjugate fiber in a bath, the fiber is subjected to a primary drawing in a bath below 65 deg.C or with dry heat at 60-120 deg.C, and subsequently the resultant fiber is drawn in a bath of >=65 deg.C. |
