| abstract |
(57) [Abstract] [Problem] Titanium, which has excellent environmental safety, is used as a catalyst element. Provided is a method for producing a polyester resin which is excellent in color tone and has few by-products such as acetaldehyde and cyclic trimer, and is suitable for food containers. SOLUTION: A dicarboxylic acid component mainly containing an aromatic dicarboxylic acid or an ester-forming derivative thereof and a diol component mainly containing ethylene glycol are combined with a titanium compound, a phosphorus compound and a group Ia element compound except hydrogen, IIa A method for producing a polyester resin which is polymerized in the presence of a catalyst containing at least one compound selected from Group III element compounds and manganese compounds, characterized in that these compounds are added to the reaction system in the following order: Method for producing polyester resin. |