| 摘要 |
PROBLEM TO BE SOLVED: To provide a crystalline polyester resin excellent in coloring, improved in thermostability and good in mechanical properties, and to provide an aromatic dicarboxylic acid composition useful for producing the same resin. SOLUTION: This aromatic dicarboxylic acid composition is composed of one or more of aromatic dicarboxylic acids, at least a compound of 1-3000 ppm to the total amount of aromatic dicarboxylic acids, selected from a group composed of 6-formyl-2-naphthoic acid, 6-methoxycarbonyl-2-naphthoic acid and trimellitic acid, and alkaline metal compound of 1-1000 ppm as alkaline metal. This crystalline polyester resin is produced by using the aromatic dicarboxylic acid composition. |
