| 摘要 |
PURPOSE:To obtain polyamide useful as a material in the field of electricity and machinery requiring strength and heat resistance, simply and efficiently, by subjecting directly a dicarboxylic acid as it is and a diamine to polycondensation in the presence of diphosphorus pentoxide without passing the dicarboxylic acid through chlorination process. CONSTITUTION:A dicarboxylic acid (e.g., isophthyalic acid, etc.), a diamine[preferably aromatic diamine such as bis(4-aminophenyl)ether, etc.] and diphosphorus pentoxide (preferably 1-2mol diphosphorus pentoxide based on 1mol dicarboxylic acid) are added to a reaction system, and, if necessary, an alkaline(earth) metal halide (e.g., lighium chloride, etc., preferably 0.5-1.5mol alkaline metal halide based on 1mol dicarboxylic acid) is added to it, and polycondensation is carried out preferably at 60-100 deg.C, to give the desired polyamide.
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