| 摘要 |
A method for producing polyester resin includes: esterifying an alcoholic component, and an acid component containing polyvalent carboxylic acid and/or an ester-forming derivative thereof in a reaction solution. A condition of reaction pressure is changed from a pressurized state to a normal pressure state, or to a depressurized state under a condition (I) that an acid-based extent of reaction of the esterification is 76-94%, and a condition (II) that an undissolved acid component is present in the reaction solution.
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