| 摘要 |
PROBLEM TO BE SOLVED: To provide a polylactic acid short fiber having an excellent mechanical strength and also showing less deformation caused by heat, a method for producing the same, and a nonwoven fabric using the polylactic acid short fiber as a main fiber and having a good dimensional stability. SOLUTION: This polylactic acid short fiber is characterized by constituted with the polylactic acid having≥(99/1) ratio of the L-lactic acid/D-lactic acid (copolymerization molar ratio),≤30% dry shrinkage at 140°C and≥3.0 cN/dtex single fiber strength. Also, the polylactic acid short fiber is produced by melt-spinning the polylactic acid having≥(99/1) ratio of the L-lactic acid/D-lactic acid (copolymerization molar ratio) and≤0.08 mass% monomer amount, then drawing the obtained undrawn yarn and performing a heat treatment under a tension. COPYRIGHT: (C)2006,JPO&NCIPI
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