Patent ID: 8501897

Claim:
A method for producing a liquid-crystalline polyester, the method comprising: a step of melt-polymerizing raw monomers in a reactor having a draw outlet to obtain a polymer melt; and a step of drawing the polymer melt through the draw outlet, characterized in that: the raw monomers comprise at least one kind of a compound (1) selected from the group consisting of an aromatic hydroxycarboxylic acid and polymerizable derivatives thereof, at least one kind of a compound (2) selected from the group consisting of an aromatic dicarboxylic acid and polymerizable derivatives thereof and at least one kind of a compound (3) selected from the group consisting of an aromatic diol, an aromatic hydroxyamine, an aromatic diamine and polymerizable derivatives thereof; the amount of units derived from a compound (A) containing a 1,2-phenylene skeleton and/or a 1,3-phenylene skeleton in a main chain of the resulting polyester is in the range of from 0 to 10 mol % based on the raw monomers; the melt polymerization is performed in the presence of a heterocyclic compound containing two or more nitrogen atoms; and the polymer melt has a flow initiation temperature of from 220 to 250° C.