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Dimethyl terephthalate, dimethyl isophthalate, ethylene glycol, bisphenol A-ethylene oxide (2 mols) adduct, and manganese acetate were deposit into a reactor installed with a heater, a stirrer, a rectification column, a pressure-reducing device and a thermometer, as in Table 17, and gradually heated in a nitrogen atmosphere up to a temperature falling between 160 and 220° C. over a period of about 4 hours to effect interesterification, while removing ethanol through distillation. Then, this was subjected to polycondensation under a reduced pressure of from 0.5 to 5.0 mmHg at 260° C. for about 2 hours. Thus were obtained bisphenol A-added polyester resins b-1 to b-4 as in Table 17. Each of the thus-obtained, bisphenol A-added polyester resins was dissolved in a mixed solvent of cyclohexanone/Solvesso 150 (50/50, by weight) to prepare a resin solution having a nonvolatile content of 40%. The molecular weight of each bisphenol A-added polyester resin being produced was controlled by varying the polycondensation time. The number-average molecular weight of each resin was measured in terms of polystyrene, through gel permeation chromatography.

1. temperaturea rectification column, a pressure-reducing device and a thermometer, as in Table 17, and gradually heated in a nitrogen atmosphere up to a temperature
2. customwhile removing ethanol
3. distillationthrough distillation
4. waitThen, this was subjected to polycondensation under a reduced pressure of from 0.5 to 5.0 mmHg at 260° C. for about 2 hours