The present invention provides a method for producing a formed article from a dope comprising a polyphosphoric acid solvent and a polymer soluble in polyphosphoric acid, which includes using a production apparatus containing an apparatus for stirring and uniformly dispersing or homogenizing a dope and a pump apparatus for delivering the uniformly dispersed or homogeneous dope, wherein at least one of the apparatus and the pump apparatus has a part that comes into contact with the dope. According to the present invention, maintenance frequency of production facility due to the corrosion and elution of metal in a recovered solvent can be reduced, which in turn decreases the production cost.
本发明提供了一种利用由聚
磷酸溶剂和可溶于聚
磷酸的聚合物组成的涂料生产成型制品的方法,该方法包括使用一种生产设备,该设备包含用于搅拌和均匀分散或均化涂料的装置以及用于输送均匀分散或均化涂料的泵装置,其中至少一个装置和泵装置具有与涂料接触的部分。根据本发明,可以减少因回收溶剂中
金属的腐蚀和洗脱而导致的生产设备维护频率,从而降低生产成本。