| abstract |
[Problem] To provide a liquid crystalline polyester fiber having high strength, high elastic modulus, excellent wear resistance, and particularly excellent longitudinal uniformity in order to improve the weaving property and quality of a fabric made of liquid crystalline polyester fiber. In differential calorimetry, a peak half-value width in an endothermic peak (Tm1) observed when measured under a temperature rising condition of 50 ° C. to 20 ° C./min is 15 ° C. or more, and a weight average molecular weight in terms of polystyrene. A liquid crystal polyester fiber characterized by having a fluctuation waveform of less than 10% in a half inert diagram mass waveform in a Worcester yarn unevenness testing machine. [Selection figure] None |