Patent ID: 7022807
Filing Date: 2006-04-04
Classification: C08G

Abstract:
1. A method for producing a liquid-crystalline polyester solution composition comprising an aprotic solvent and a liquid-crystalline polyester comprising: at least one of the repeating units selected from the group consisting of a repeating unit derived from aromatic diamine, a repeating unit derived from aromatic amine having a hydroxyl group, and a repeating unit derived from aromatic amino acid, wherein the at least one of the repeating units is from 10 to 35 mol % in the liquid-crystalline polyester, and at least one of the repeating units represented by formulae (1), (2) and (3): wherein Ar wherein the content of the repeating units represented by formulae (1), (2) and (3) is 30 to 80 mol %, 35 to 10 mol % and 35 to 10 mol %, respectively, in the liquid crystalline polyester and the method comprising the steps of: acylating at least one repeating unit selected from the group consisting of a hydroxycarboxylic acid providing the repeating unit represented by formula (1), an aromatic diamine, an aromatic amine having a hydroxyl group, an aromatic acid, and a repeating unit represented by formula (3) with an excess amount of a fatty acid anhydride to obtain an acylated compound, transesterification of the acylated compound and an aromatic dicarboxylic acid providing the repeating unit represented by formula (2) to obtain a liquid-crystalline polyester; dissolving the polyester in an aprotic solvent to obtain a liquid-crystalline polyester solution composition thereof.