| 摘要 |
PROBLEM TO BE SOLVED: To provide a latently crimpable polylactic acid conjugated fiber exhibiting biodegradability in soil or in the air, having good yarn manufacturing properties, imparting excellent stretchability to a product using the fiber and further suitable for affording a fabric having light screening properties (see- through preventing properties). SOLUTION: The latently crimpable polylactic acid conjugated fiber is obtained by arranging a polylactic acid resin A which is a high-molecular weight component and a polylactic acid resin B that is a low-molecular weight component in a side-by-side type. The fiber has the latent crimpability exhibiting spiral crimps of≥50 crimps/25 mm after dry heat treatment at 140°C. The number-average molecular weight of the polylactic acid resin A forming the fiber is preferably 60,000-90,000 and that of the polylactic acid resin B is preferably 10,000-40,000. The difference between the polylactic acid resins A and B is preferably 10,000-40,000. The optical purity of the polylactic acid resins A and B is preferably≥98% and≥0.10 mass% of titanium dioxide is preferably contained in the fiber. COPYRIGHT: (C)2004,JPO
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