4-(5-amino-6-hydroxybenzoxazol-2-yl) ammonium benzoate and preparation method and use thereof

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United States of America Patent

PATENT NO 9725424
SERIAL NO

14439952

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Abstract

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Disclosed in the present invention are 4-(5-amino-6-hydroxybenzoxazol-2-yl)ammonium benzoate shown in formula (I) and the preparation method and use thereof. The preparation method comprises: fully reacting 4-(5-amino-6-hydroxybenzoxazol-2-yl)benzoic acid shown in formula (II) or 4-(5-amino-6-hydroxybenzoxazol-2-yl)carboxamide benzoate, as a raw material, with ammonia in an aqueous solvent, and directly heating the obtained reaction liquid to remove excess ammonia, so as to obtain 4-(5-amino-6-hydroxybenzoxazol-2-yl)ammonium benzoate. The mass of the 4-(5-amino-6-hydroxybenzoxazol-2-yl)ammonium benzoate (ABAA) prepared in the present invention can reach a polymer grade (where the purity is above 99.5%, the content of metal ions is below 200 ppm, and containing no DMF polymerization inhibition impurities), and the 4-(5-amino-6-hydroxybenzoxazol-2-yl)ammonium benzoate can be used as an AB type monomer for preparing PBO and modified PBO fibers, the resulting PBO having an intrinsic viscosity ηof up to 38/dl/g, and the method has such features as ABAA being highly soluble in PPA, a fast polymerization speed, a short time of 2-4 h, a low temperature of 150° C., a high molecular weight of the polymer, fibers of excellent tensile property, being easy to industrialize, etc.

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Patent Owner(s)

Patent OwnerAddress
ZHEJIANG UNIVERSITY OF TECHNOLOGY310014 HANGZHOU CITY IN THE LOWER REACHES OF THE CITY OF ZHEJIANG WANG ROAD NO 18 HANGZHOU CITY ZHEJIANG PROVINCE 310014
YANCHENG DRAGON CHEMICAL CO LTDSOUTH END OF NINGHAI ROAD CHEMICAL ZONE BINAHAI ECONOMIC DEVELOPMENT ZONE YANCHENG JIANGSU 224555

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
He, Biao Zhejiang, CN 63 241
Jin, Jing Zhejiang, CN 171 1847
Jin, Ningren Zhejiang, CN 1 0

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