发明名称 |
Process for producing a polyoxyalkylenecarboxylic acid |
摘要 |
A process for producing a polyoxyalkylenecarboxylic acid which comprises: (A) a step of obtaining a salt of a polyoxyalkylenecarboxylic acid by reacting a polyoxyalkylene compound having hydroxyl group at one or both ends of the molecule with a salt of a halogenated acetic acid or a salt of a halogenated propionic acid in an amount of 4 to 50 mol per 1 mol of the polyoxyalkylene compound and an alkali metal hydroxide in an amount of 8 to 70 mol per 1 mol of the polyoxyalkylene compound in the presence of an organic solvent at 80 DEG to 150 DEG C.; (B) a step of converting the obtained salt of a polyoxyalkylenecarboxylic acid into the polyoxyalkylenecarboxylic acid by adjusting pH of the reaction mixture obtained in step (A) to 3 or less by adding an inorganic acid; (C) a step of removing byproducts and the like by washing the obtained solution containing the polyoxyalkylenecarboxylic acid with an aqueous solution of an inorganic salt; and (D) a step of removing the organic solvent and water at a decreased pressure at 50 DEG to 120 DEG C. and removing precipitated salts by filtration. A high purity, high molecular weight polyoxyalkylenecarboxylic acid which contains only small amounts of unreacted starting materials or byproducts can easily be obtained.
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申请公布号 |
US5840973(A) |
申请公布日期 |
1998.11.24 |
申请号 |
US19970917824 |
申请日期 |
1997.08.27 |
申请人 |
NOF CORPORATION |
发明人 |
YASUKOHCHI, TOHRU;MARUYAMA, KEI-ICHI;MARUYAMA, TSUNEKATSU |
分类号 |
C07C51/367;C07C59/125;(IPC1-7):C07C59/125 |
主分类号 |
C07C51/367 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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