METHOD FOR PRODUCING POLYESTER RESIN AND POLYESTER RESIN OBTAINED THEREBY

PROBLEM TO BE SOLVED: To provide a method for producing a polyester resin capable of providing a polyester molded product such as a heat-resistant bottle in high efficiency by which a crystallization rate while raising the temperature is increased when producing the polyester resin, the time required for crystallization step is shortened when carrying out the production, and the adhesion of the polyester resin to each other is avoided to improve the productivity, without damaging the transparency of a molded product and the moldability. SOLUTION: This method for producing the polyester resin by subjecting a dicarboxylic acid component consisting essentially of an aromatic dicarboxylic acid or an ester-forming derivative thereof, and a diol component consisting essentially of ethylene glycol to an esterification or ester-interchange reaction, and polymerizing the resultant product by a polycondensation reaction comprises carrying out the polymerization reaction by adding an ester-forming organic compound having a >=15C saturated or unsaturated hydrocarbon chain which may have an ether group in the chain, in an amount regulated so that the remaining amount thereof in the polyester resin may be