METHOD FOR PRODUCING LIQUID CRYSTALLINE POLYESTER, METHOD FOR SOLID PHASE POLYMERIZATION OF LIQUID CRYSTALLINE POLYESTER, AND LIQUID CRYSTALLINE POLYESTERS OBTAINED BY THE METHODS

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a liquid crystalline polyester which exhibits good discharge property from a polymerization can, can adequately improve heat resistance by solid phase polymerization, and substantially avoids a viscosity rise when melted after solid phase polymerization.;SOLUTION: When a liquid crystalline polyester having a flow start temperature of ≥255°C is produced by melt polymerization using an aromatic hydroxycarboxylic acid, an aromatic dicarboxylic acid and an aromatic diol, further an aromatic monoalcohol is used in an amount of 50-200 wt.ppm relative to the total amount of the aromatic diol and the aromatic monoalcohol. The aromatic moiety of the hydroxycarboxylic acid is a 2,6-naphthalenediyl group, a 1,4-phenylene group or a 4,4'-biphenylene group. The aromatic moieties of the dicarboxylic acid and the diol are each a 2,6-naphthalenediyl group, a 1,4-phenylene group, a 1,3-phenylene group or a 4,4'-biphenylene group. The aromatic moiety of the monoalcohol is a naphthyl group.;COPYRIGHT: (C)2010,JPO&INPIT