| abstract |
PROBLEM TO BE SOLVED: To provide a catalyst for producing a polyester having a good color tone (b value), having a small amount of foreign matter, and having excellent fusion heat stability, and a polyester production method using the same. SOLUTION: An aromatic dicarboxylic acid is produced by using a reaction product of a titanium compound and / or a titanium compound component containing a titanium compound obtained by reacting a titanium compound with a polyvalent carboxylic acid or an anhydride thereof and a phosphorus compound component as a catalyst. A polyester is obtained by subjecting a polymerization starting material comprising an alkylene glycol ester of an acid and / or a low polymer thereof to a polycondensation reaction. |