Method for producing total aromatic thermotropic liquid crystalline polyester and its use

摘要

PROBLEM TO BE SOLVED: To improve hue degradation of a wholly aromatic thermotropic liquid crystal polyester without deteriorating good moldability and heat resistance.;SOLUTION: The production method for the wholly aromatic thermotropic liquid crystal polyester is carried out by using raw materials including an aromatic hydroxycarboxylic acid, and involves an acetylation process, a melt polycondensation process, a cooling solidification process where the product by the melt polycondensation process is cooled and solidified, a process of pulverizing the solidified product and a solid-phase polycondensation process, in this order. The solidification process comprises the means of cooling with nitrogen stream, where the product is cooled to ≤50°C within 20 hours after being taken out from the melt polyconsensation process.;COPYRIGHT: (C)2007,JPO&INPIT