申请人:HOECHST CELANESE CORPORATION
公开号:EP0705863A1
公开(公告)日:1996-04-10
The present invention is directed to a two stage melt polymerization process for producing polybenzimidazoles and aromatic amide polymers. The process includes the steps of: 1) providing a mixture of an aromatic amine, a dicarboxylic component, and a foaming agent; 2) heating the mixture to a condensation polymerization temperature in a first stage under a substantially oxygen-free atmosphere; 3) maintaining the mixture at that temperature, but in no event at a temperature greater than 350°C while allowing a friable foam to form; 4) cooling the foam; 5) crushing the foam to obtain a prepolymer; and 6) heating the prepolymer in a second stage, to a temperature in excess of the highest temperature employed in the first stage, under a substantially oxygen-free atmosphere, and until a desired inherent viscosity is obtained.
本发明涉及一种生产聚苯并咪唑和芳香族酰胺聚合物的两阶段熔融聚合工艺。该工艺包括以下步骤1)提供由芳香胺、二羧酸组分和发泡剂组成的混合物;2)在第一阶段,在基本无氧的气氛下,将混合物加热到缩合聚合温度;3)将混合物保持在该温度,但在任何情况下都不能超过 350℃,同时允许形成易碎泡沫;4) 冷却泡沫; 5) 粉碎泡沫,得到预聚物; 6) 在第二阶段,在基本无氧的环境下,将预聚物加热到超过第一阶段最高温度的温 度,直到获得所需的固有粘度。