申请人:CELANESE CORPORATION
公开号:EP0177182A2
公开(公告)日:1986-04-09
A two stage process for the production of polybenzimidazoles is provided wherein an aromatic tetraamine, e.g., 3,3',4,4' - tetraaminobiphenyl is reacted with a free dicarboxylic acid, e.g., isophthalic acid, or with a dicarboxylic component comprising a compound having the formula
in which R' is a divalent organic radical and Y is hydrogen, aryl or alkyl provided that no more than 95% of the Y's are hydrogen or phenyl. The reactants are heated with agitation in a first stage to a temperature above the melting point of the tetraamine until the viscosity of the mixture rises as indicated by an agitator torque of at least 1.5 times that before the rise in viscosity. The agitation is then discontinued and the reaction mixture is allowed to foam while heating is continued. The foam is then allowed to cool to a friable mass and is crushed to a ground prepolymer which is heated with agitation in a second stage until the desired polymer is obtained. The invention makes possible the production of certain new polybenzimidazoles.
本发明提供了一种生产聚苯并咪唑的两阶段工艺,其中芳香族四胺(如 3,3',4,4'-四氨基联苯)与游离二羧酸(如间苯二甲酸)或二羧酸组分反应,二羧酸组分包括如下式的化合物
其中 R'为二价有机基,Y 为氢、芳基或烷基,但不超过 95% 的 Y 为氢或苯基。在第一阶段中,在搅拌下将反应物加热到高于四胺熔点的温度,直到混合物的粘度上升, 搅拌扭矩至少为粘度上升前的 1.5 倍。然后停止搅拌,让反应混合物起泡,同时继续加热。然后让泡沫冷却成易碎的块状,并将其粉碎成磨碎的预聚物,在第二阶段搅拌加热,直到得到所需的聚合物。本发明使某些新型聚苯并咪唑的生产成为可能。