| 摘要 |
A liquid crystalline polyester having structural units (I), (II), (III), (IV) and (V) given below, wherein
a ratio of the structural unit (I) to sum of the structural units (I), (II) and (III) is 68 to 80 mol%, a ratio of the structural unit (II) to sum of the structural units (II) and (III) is 55 to 75 mol%, and a ratio of the structural unit (IV) to sum of the structural units (IV) and (V) is 60 to 85 mol%, wherein
a total amount of the structural units (II) and (III) is substantially equimolar with a total amount of the structural units (IV) and (V), and ”S (entropy of melting) defined by Equation [1] given below is 1.0 to 3.0×10 -3 J/g·K: ”S J / g ‹ K = ”Hm J / g / Tm K
(Tm herein means an endothermic peak temperature (Tm3) observed in differential scanning calorimetry of the liquid crystalline polyester, wherein after observation of an endothermic peak temperature (Tm1) in measurement with heating the liquid crystalline polyester at a rate of temperature of 20°C/ minute from room temperature, an endothermic peak temperature (Tm2) is observed when temperature is sequentially maintained at Tm1+20°C for 5 minutes, decreased to room temperature at a rate of 20°C/ minute, and increased again at a rate of 20°C/ minute, wherein after observation of the endothermic peak temperature (Tm2), the endothermic peak temperature (Tm3) is observed when temperature is sequentially maintained at Tm1+20°C for 5 minutes, decreased to room temperature at a rate of 20°C/ minute, and increased again at a rate of 20°C/ minute, and wherein ”Hm represents an endothermic peak area (”Hm3) at the temperature Tm3.) |
