A process for producing a wholly aromatic polyester which is excellent in heat resistance, mechanical properties and yet color and has a high degree of polymerization by melt polymerizing a dicarboxylic acid and a diol directly on an industrial scale at a low cost in a short period of time without esterifying the dicarboxylic acid or diol in advance.
To produce the wholly aromatic polyester by reacting and molding an aromatic dicarboxylic acid such as terephthalic acid, an aromatic diol such as 2,2-bis(4-hydroxyphenyl)propane and a diaryl carbonate by heating, a combination of a specific pyridine compound and an alkali metal (bi)carbonate, a combination of a specific pyridine compound and an organic tin compound or a specific titanium compound is existent as a catalyst. Thereby, the wholly aromatic polyester having the above properties is obtained.
一种生产全芳香族聚酯的工艺,这种聚酯具有优异的耐热性、机械性能和色泽,而且聚合度高,其方法是不预先将二
羧酸或二元醇酯化,直接在短时间内以低成本在工业规模上进行熔融聚合。
为了通过加热使芳香族二
羧酸(如
对苯二甲酸)、芳香族二元醇(如 2,2-双(
4-羟基苯基)
丙烷)和
碳酸二芳基酯反应并成型来生产全芳香族聚酯,存在特定
吡啶化合物和碱
金属(双)
碳酸酯的组合、特定
吡啶化合物和
有机锡化合物或特定
钛化合物的组合作为催化剂。这样,就得到了具有上述特性的全芳香族聚酯。