Patent ID: 8101688

Claim:
Polylactic acid fiber comprising a polylactic acid containing fatty acid bisamide in an amount of 0.1 to 5 weight % in relation to the whole of fiber, said fatty acid bisamide having a melting point of 100° C. or higher and being selected from the group consisting of ethylene-bis(stearamide), ethylene-bis(oleamide), ethylene-bis(erucamide) and m-xylylene-bis(stearamide), wherein said fiber is produced by a melt-spinning method and has a b* value in fiber color system of L*a*b* in the range of −1 to 5 and a single fiber fineness of 0.1-10 dtex, and the polylactic acid is 40 eq/t or less in carboxyl end group amount.