Liquid crystalline polyester fiber

摘要

A liquid crystalline polyester fiber which exhibits a heat of melting (”Hm1) of 5.0 J/g or more as observed in differential calorimetry under heating from 50°C at a temperature elevation rate of 20°C/min, and a strength of 13.0 cN/dtex or more; 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 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 strength, high elastic modulus and excellent thermal resistance.