Polyester resin composition

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PROBLEM TO BE SOLVED : To provide a polyester resin composition having excellent thermal/oxidative degradation resistance and transparency. SOLUTION : A polyester resin composition contains a rare earth element, an alkali metal element, and a phosphorus element, satisfying formula (I). M/A≥0.1 (I) (M is the total molar quantity of rare earth elements, and A is the total molar quantity of alkali metal elements). SELECTED DRAWING : None COPYRIGHT : (C)2019, JPO&INPIT