LIQUID-CRYSTAL POLYESTER FIBER

PROBLEM TO BE SOLVED: To provide liquid-crystal polyester fiber capable of enhancing a property of woven fabric, excellent in abrasion resistance and in compression resistance in the fiber-axis perpendicular direction (traverse direction) without deteriorating the characteristics of woven fabric composed of the fibers of a solid phase-polymerized liquid-crystal polyester, such as high strength, high elastic modulus and excellent heat resistance. SOLUTION: The liquid-crystal polyester fiber is characterized in that a peak half-value width is ≥15°C at an endothermic peak (Tm1) observed when measured under a temperature-rising condition of 20°C/min from 50°C in a differential caloric measurement and in that the average molecular weight of the polystyrene conversion is ≥250,000 and ≤2,000,000 with its structural unit including condensed polycyclic aromatic hydrocarbon to the entire liquid-crystal polyester structural unit being ≥5 mol%. COPYRIGHT: (C)2010,JPO&INPIT