PROBLEM TO BE SOLVED: To obtain a polylactic acid filament which has excellent insecticidal effect, has no decomposition of an insecticide during spinning, excellent productivity and strength with no problem of weaving and knitting by adding a pyrethroid-based insecticide to a polylactic acid. SOLUTION: The polylactic acid filament is obtained by adding 0.3-7% of a pyrethroid-based repellent to the polylactic acid having≥95% L isomer, has excellent insecticidal (repelling) effect on insect pests, exhibits excellent strength/productivity due to slight decomposition of the insecticide during spinning and has no problem of weaving and knitting. COPYRIGHT: (C)2003,JPO
