| 摘要 |
PURPOSE:To obtain a high-polymerization degree polyester excellent in mechanical and thermal properties within a short time, by effecting the polycondensation reaction for producing a polyester by adding a predetermined amount of hydrogen chloride after completion of the esterification or transesterification. CONSTITUTION:A polyester is produced by reacting terephthalic acid or a terephthalic acid-based dicarboxylic acid (or its esterifiable derivative) with ethylene glycol or an ethylene glycol-based glycol (its esterifiable derivative). Hydrogen chloride, as a polycondensation catalyst, in an amount of 0.2X10<-4>- 30X10<-4>mol, per mol of the acid component is added to the reaction system after the esterification or transesterification reaction is completed, and the reaction mixture is polycondensed to obtain the purpose high-polymerization degree polyester. The obtained polyester is separated from hydrogen chloride by drying to obtain a pure polyester.
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