Method For Producing Polyester Resin, And Polyester Resin

Abstract: The present invention addresses the problem of providing a method for producing a polyester resin which has satisfactory flowability, causes little mold fouling, has satisfactory mechanical properties, and is excellent in terms of moldability, producibility, and quality. This method for producing a polyester resin comprises a heating [1] step in which 0.1-5.0 parts by mass of an alkylene glycol is added to 100 parts by mass of a polyester resin [A] and the mixture is heated at a temperature exceeding the melting point TmA (°C) of the polyester resin [A], thereby obtaining a polyester resin [B] and a heating [2] step in which the obtained polyester resin [B] is heated at a temperature not higher than TmB (°C), the TmB (°C) being the melting point of the polyester resin [B], the polyester resin [B] containing the alkylene glycol remaining unreacted in an amount of 0.05-4.76 mass%.

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