| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for production of polybutylene terephthalate improving conversion in esterification or transesterification, reducing foreign substances, with suppressed side reactions. SOLUTION: The method for production of polybutylene terephthalate comprising a step carrying out an esterification (or transesterification) by continuously feeding terephthalic acid (or dialkyl terephthalate) and 1, 4-butanediol to an esterification reaction tank (or a transesterification reaction tank) in the presence of a metal compound, at least a part of the 1, 4-butanediol is fed to the esterification reaction tank (or transesterification reaction tank) independent from the terephthalic acid (or dialkyl terephthalate), wherein≥10 wt.% of the 1, 4-butanediol fed to the esterification reaction tank (or transesterification reaction tank) independent from the terephthalic acid (or dialkyl terephthalate) is fed into the liquid phase of the reaction tank and≥10 wt.% of the metal compound is fed into the liquid phase of the reaction tank independent from the terephthalic acid (or dialkyl terephthalate). COPYRIGHT: (C)2004,JPO&NCIPI
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