LIQUID CRYSTALLINE POLYESTER FIBER AND PROCESS FOR PRODUCTION OF THE SAME

摘要

A liquid crystalline polyester fiber which exhibits a half width of endothermic peak (Tm1) of 15°C or above as observed in the differential calorimetry under heating from 50°C at a temperature rise rate of 20°C/min and a tenacity of 12.0cN/dtex or above; and a process for production of the same. A liquid crystalline polyester fiber which is excellent in abrasion resistance and lengthwise uniformity and is improved in weavability and the quality of fabric and which is characterized by a small single-fiber fineness can be efficiently produced without impairing the characteristics inherent in fabric made of liquid crystalline polyester fiber produced by solid phase polymerization, namely, high tenacity, high elastic modulus and excellent heat resistance.