Studies on the synthesis of poly(1,4-butyleneterephthalate) by the direct polycon densation and its properties. (Part 3) Polycondensation of poly(1,4-butyleneterephthalate) prepolymer.

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  • Iida Hiroshi
    Fibers and Textiles Research Laboratories, Toray Industries Chemical Products Department, Toray Industries
  • Ikeuchi Hiroyuki
    Fibers and Textiles Research Laboratories, Toray Industries Patent Department, Toray Industries
  • Nakazawa Shunji
    Fibers and Textiles Research Laboratories, Toray Industries Technical Department, Ehime Plant, Toray Industries
  • Suganuma Heiroku
    Fibers and Textiles Research Laboratories, Toray Industries
  • Komatsu Hideo
    Fibers and Textiles Research Laboratories, Toray Industries Torayca Production Department, Ehime Plant, Toray Industries
  • Tanaka Michihiko
    Fibers and Textiles Research Laboratories, Toray Industries

Bibliographic Information

Other Title
  • 直接重合法によるポリ（１，４‐ブチレンテレフタレート）の合成とその性質に関する研究　ＩＩＩ　　ポリ（１，４‐ブチレンテレフタレート）プレポリマーの重縮合反応

Description

Polycondensation reaction conditions of poly (1, 4-butyleneterephthalate) (PBT) prepolymer obtained by direct esterification of terephthalic acid (TA) with butanediol-1, 4 were investigated. It was found that<br>1) the amount of tetrahydrofurane formed as a by-product decreases with lowering the conversion of TA at the esterification stage, while the ultimate molecular weight of PBT obtained decreases with lowering the conversion.<br>2) the optimum reaction temperature is lower than that in the synthesis of other poly (alkylene terephthalates).<br>3) the catalyst is favorably added at stages of both initial esterification and subsequent polycondensation, although its total concentration does not affect an ultimate molecular weight of the resulting PBT.<br>To obtain the Mark-Houwink-Sakurada viscosity equation of PBT in o-chlorophenol at 25°C, the samples having the molecular weight in the range from 8, 400 to 67, 000 were prepared and the following viscosity equation was obtained:

Journal

  • Sen'i Gakkaishi

    Sen'i Gakkaishi 43 (5), 251-256, 1987

    The Society of Fiber Science and Technology, Japan

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