Patent ID: 8299148

Claim:
A fiber made of a composition which comprises (i) poly(L-lactic acid) having a weight average molecular weight of 50,000 to 300,000 (component A), (ii) poly(D-lactic acid) having a weight average molecular weight of 50,000 to 300,000 (component B) and (iii) 0.05 to 5 parts by weight of a phosphate metal salt (component C) based on 100 parts by weight of the total of the components A and B and (iv) the fiber has a strength of 2.5 to 10 cN/dTex, and (v) the fiber has substantially a single melting peak in differential scanning calorimeter (DSC) measurement, a melting peak temperature of 195° C. or higher, and a stereo crystallization ratio in wide-angle X-ray diffraction (XRD) measurement of not less than 90%, wherein the phosphate metal salt (component C) is a compound represented by the following formula (1) or (2): wherein R 1 is a hydrogen atom or alkyl group having 1 to 4 carbon atoms, R 2 and R 3 are each independently a hydrogen atom or alkyl group having 1 to 12 carbon atoms, M 1 is an alkali metal atom or alkali earth metal atom, and p is 1 or 2, wherein R 4 , R 5 and R 6 are each independently a hydrogen atom or alkyl group having 1 to 12 carbon atoms, M 2 is an alkali metal atom or alkali earth metal atom, and p is 1 or 2.