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发明公开
CN102977045A 4-(5-氨基-6-羟基苯并噁唑-2-基)苯甲酸铵及其制备与应用 失效 - 权利终止

4-(5-氨基-6-羟基苯并噁唑-2-基)苯甲酸铵及其制备与应用
摘要：
本发明公开了式（I）所示的4-(5-氨基-6-羟基苯并噁唑-2-基)苯甲酸铵及其制备与应用，其制备方法为：以式（II）所示的4-(5-氨基-6-羟基苯并噁唑-2-基)苯甲酸或者式（III）所示的4-(5-氨基-6-羟基苯并噁唑-2-基)苯甲酸羧胺盐为原料，在水溶剂中与氨充分反应，所得反应液直接加热脱出过量的氨，得到4-(5-氨基-6-羟基苯并噁唑-2-基)苯甲酸铵。本发明制得的4-(5-氨基-6-羟基苯并噁唑-2-基)苯甲酸铵的质量可达聚合级（纯度99.5%以上，金属离子含量200ppm以下且不含DMF阻聚杂质），可作为AB型单体制备PBO和改性PBO纤维，制得的PBO和改性PBO具有分子量高、抗拉性能优异的特点。
摘要（英）：

The invention discloses 4-(5-amino-6-hydroxybenzoxazole-2-yl)ammonium benzoate shown by a formula (I) as well as a preparation method and application thereof. According to the preparation method, 4-(5-amino-6-hydroxybenzoxazole-2-yl)benzoic acid shown by a formula (II) or 4-(5-amino-6-hydroxybenzoxazole-2-yl)carboxamide benzoate is utilized as a raw material. The method comprises the following steps of: enabling the raw material to sufficiently react with ammonia in a water solvent; and directly heating the obtained reaction liquid to remove excessive ammonia to obtain 4-(5-amino-6-hydroxybenzoxazole-2-yl)ammonium benzoate. According to the method disclosed by the invention, the mass of the prepared 4-(5-amino-6-hydroxybenzoxazole-2-yl)ammonium benzoate can reach a polymer grade (the purity is over 99.5%, the content of metal ions is less than 200ppm, and no DMF (Dimethyl Formamide) polymerization inhibition impurity is contained), and the 4-(5-amino-6-hydroxybenzoxazole-2-yl)ammonium benzoate can be used as an AB type monomer to prepare PBO and modified PBO fiber; and the prepared PBO and modified PBO have the characteristics of high molecular weight and excellent tensile property.

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