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    • 50. 发明公开
    • Process for producing poly(arylene sulfide)
    • 生产聚(亚油酸酯)的方法
    • EP0244187A3
    • 1987-12-02
    • EP87303708
    • 1987-04-27
    • KUREHA KAGAKU KOGYO KABUSHIKI KAISHA
    • Iwasaki, TakaoIizuka, YoKatto, TakayukiShiiki, Zenya
    • C08G75/02
    • C08G75/0254C08G75/0213C08G75/0281
    • A poly(arylene sulfide) useful for packaging electronic parts, containing not more than 50 ppm of an alkali metal and having a melt viscosity of 1 to 30 Pa s (10 to 300 poise) measured at 310°C and shear rate of 10,000 sec-1) is prepared by:
      [A] reacting an alkali metal sulfide with from 1.0 to 2.0 mol of a dihaloaromatic compound per mole of the alkali metal sulfide at a temperature of from 180 to 235°C and in the presence of from 0.5 to 2.4 mol of water per mol of the alkali metal sulfide until the conversion rate of the dihaloaromatic compound is not less than 50 mol% of the theoretically necessary amount and the melt viscosity (measured at 310°C and at a shear rate of 10,000 sec-1) of the thus formed poly(arylene sulfide) is not more than 0,5 Pa s (5 poise); [B] adding water to the thus obtained reaction mixture so that from 2.5 to 7.0 mol of water is present per mol of the alkali metal sulfide and heating the reaction mixture to a temperature of from 250 to 290°C, thereby continuing the reaction so that the melt viscosity (measured at 310°C and a shear rate of 10,000 sec -1 ) of the thus formed poly(arylene sulfide) is not less than 5 times that of the poly(arylene sulfide) formed in step [A] and not more than 30 Pa s (300 poise); and [C] after separating the thus formed poly(arylene sulfide) from the polymerisation reaction mixture of step [B], treating the thus obtained poly(arylene sulfide) with an aqueous solution of a strong acid of pH of less than 2 or with an aqueous 0.1 to 30% by weight solution of a salt of the strong acid and a weak base at a temperature of from 0 to 200°C for from 1 to 500 min.