METHOD FOR PRODUCING POLYESTER

摘要

The polyester chip having an excellent surface property was prepared by the reaction of dimethylterephthalate and ethylene glycol. 50- 500 ppm of an inorganic metal compound such as calcium acetate and 100- 700 ppm of an antimony oxide such as antimony trioxide were esterified, followed by addition of 50- 800 ppm of an inorganic metal compound such as lithium acetate, 60- 950 ppm of phosphor compound such as trimethyl phosphate, acetic acid and sodium hydroxide or tetramethylhydroamine. Thus, 1:2 mole ratio of dimethylterephthalate and ethylene glycol were esterified at 235 deg.C in the presence of 0.50 mole % of calcium acetate and 0.67 mole % of antimony trioxide, followed by polycondensation of 0.5 mole % of lithium acetate and 0.5 mole % of phosphoric acid at 235 deg.C.