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AssigneeToray Industries, Inc.
InventorsAkito Konishi, Mitsushige Hamaguchi, Hideyuki Umetsu
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The present invention is a method for producing a liquid crystalline polyester, which comprises reacting an aromatic hydroxycarboxylic acid, a diol containing 70 mol % or more of an aromatic diol having a structural unit (I) as shown below and an aromatic dicarboxylic acid with one another in the presence of an acylating agent and an aliphatic sulfonic acid represented by formula (A) shown below. (wherein Ar represents a bivalent aromatic group which is an aromatic hydrocarbon group and has a molecular weight of less than 200) Formula (A) R—SO3H (wherein R represents an alkyl group having 1 to 12 carbon atoms) According to the present invention, a liquid crystalline polyester, which can be molded into an article having excellent tensile strength and excellent creep properties and from which a gas is generated in a reduced amount, can be produced with high efficiency.
A method for producing a liquid crystalline polyester, said method comprising reacting an aromatic hydroxycarboxylic acid(s), a diol(s) containing an aromatic diol having the following structural unit (I) in an amount of not less than 70 mol % with respect to 100 mol % of entire diol used for producing liquid crystalline polyester, and an aromatic dicarboxylic acid(s),
A liquid crystalline polyester comprising a structural unit derived from an aromatic diol represented by the following structural unit (I):
Dependencies are inferred from the claim text.