Method for producing a liquid crystalline polyester and the liquid crystalline polyester

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—R1—COOH (I)
• HO—R2—OH (II)
• HOOC—R3—COOH (III)
• wherein, R1 and R3 are an optionally substituted arylene group, R2 is an optionally substituted arylene group or a group represented by the formula (V),
• wherein R4 to R7 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—, —SO2—, —CO—, —C6H10—, 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 R12 and R13 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 R12 and R13 may be combined with each other, R14 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.