| 摘要 |
PROBLEM TO BE SOLVED: To provide staple fiber that is biodegradable, has excellent thermal binder property and durability, retaining the thermal binder property even after repeated use, and a method for production thereof. SOLUTION: The polylactic acid-based conjugate staple fiber is composed of two kinds of polylactic acid-based polymers A and B having optical purity mutuary different by 5 to 20% and the melt flow rate value of the polymer A, MFR(A) and the melt flow rate value of the polymer B, MFR(B) satisfy following formulas (1) to (3) and further they are conjugated so that the polymer B of low optical purity may partially be exposed on the fiber surface. 5≤MFR(A)≤100 (1), 5≤MFR(B)≤80 (2), MFR(A)≥MFR(B) (3). MFR(A): the melt flow rate of the polymer of high optical purity (g/10 mn), MFR(B): the melt flow rate of the polymer of lower optical purity than that of the polymer (A) (g/10 mn). COPYRIGHT: (C)2009,JPO&INPIT
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