Provided is a method for producing a polybenzoxazole resin, in which even in the case of heat treating a polybenzoxazole precursor at a low temperature, a polybenzoxazole resin that is excellent in mechanical properties, such as tensile elongation, and in chemical resistance, is suppressed in terms of coloration, and is high in transparency can be produced. A polybenzoxazole resin is formed by heating a polybenzoxazole precursor which is obtained by allowing an aromatic diaminediol and a diformyl compound or a dicarboxylic acid dihalide, to react with each other in a solvent containing an amide compound or a urea compound each having a specified structure, at 120°C to 350°C.
本发明提供了一种生产聚
苯并恶唑树脂的方法,即使在低温下对聚
苯并恶唑前体进行热处理,也能生产出机械性能(如拉伸伸长率)和耐
化学性优异、着色抑制和透明度高的聚
苯并恶唑树脂。聚苯并
噁唑树脂是通过加热聚苯并
噁唑前体形成的,聚苯并
噁唑前体是通过让芳香族二烯二醇和二甲酰基化合物或二
羧酸二卤化物在含有酰胺化合物或
脲化合物的溶剂中,在 120°C 至 350°C 的温度下相互反应而得到的。