| 摘要 |
PROBLEM TO BE SOLVED: To provide a production method of a polyester resin composition which is excellent in color tone and suitable for optical applications. SOLUTION: This production method of a polyester resin composition is characterized in that in the production of a polyester resin composition by subjecting terephthalic acid and/or naphthalenedicarboxylic acid containing an aldehyde acid in an amount of 0.1 to 0.5 mol/ton, based on the amount of the polyester resin composition, and ethylene glycol to an esterification reaction and a polycondensation reaction, a phosphonite compound and/or a phosphite compound are(is) added to the reaction mixture in an amount of 20 ppm or more and 150 ppm or less in terms of a phosphorus atom based on the polyester, and in the amount satisfying the equation (I): 5≤P/AA≤30 (Equation (I)) (where P and AA represent a content of a phosphorus atom and an added amount of an aldehyde acid respectively in an unit of mol/ton (based on the amount of the polyester resin composition)), during the period until the intrinsic viscosity of the reaction mixture reaches 0.3 after the completion of the esterification reaction. COPYRIGHT: (C)2010,JPO&INPIT
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