Patent ID: 7009026

Claim:
A method for producing a liquid crystalline polyester comprising melt-polymerizing aromatic hydroxycarboxylic acid represented by the formula (I), aromatic diol represented by the formula (II), and aromatic dicarboxylic acid represented by the formula (III) with a diaryl carbonate represented by the formula (IV): HO—R 1 —COOH (I) HO—R 2 —OH (II) HOOC—R 3 —COOH (III) wherein, R 1 and R 3 are an optionally substituted arylene group, R 2 is an optionally substituted arylene group or a group represented by the formula (V), wherein R 4 to R 7 are each independently a hydrogen atom, a halogen atom, an acyloxy group with a carbon number of from 1 to 6, or an alkyl group with a carbon number of from 1 to 6, and X is —O—, —S—, —SO 2 —, —CO—, —C 6 H 10 —, or an alkylene group, and wherein the melt-polymerization is carried out in the presence of at least one compound selected from the group consisting of 1-methylimidazole, 2-methylimidazole, and a pyridine compound represented by the formula (VII): wherein R 12 and R 13 are each independently a hydrogen atom, an alkyl group with a carbon number of from 1 to 6, a cycloalkyl group with a carbon number of from 5 to 10, an aryl group with a carbon number of from 6 to 12, or an aralkyl group with a carbon number of from 6 to 12, and R 12 and R 13 may be combined with each other, R 14 is an alkyl group with a carbon number of from 1 to 6, a cycloalkyl group with a carbon number of from 5 to 10, an aryl group with a carbon number of from 6 to 12, or an aralkyl group with a carbon number of from 6 to 12, and n is an integer of from 1 to 4, and solid-polymerizing the liquid crystalline polyester produced by the melt-polymerizing.