Provided is a main chain type liquid crystal polyester which comprises at least two units selected from an aromatic diol unit, an aromatic dicarboxylic acid unit, and an aromatic hydroxycarboxylic acid unit as essential units and a structural unit having a cationically polymerizable unit in at least one of the terminal ends. The main chain type liquid crystalline polyester, when used as an optical material, is excellent in the capability of retaining a liquid crystal orientation having been aligned and fixed under practical service conditions and exhibits an excellent mechanical strength.
本发明提供了一种主链型液晶聚酯,它包括至少两个选自芳香族二元醇单元、芳香族二
羧酸单元和芳香族羟基
羧酸单元的基本单元,以及至少一个末端具有阳离子可聚合单元的结构单元。这种主链型液晶聚酯用作光学材料时,在实际使用条件下可保持液晶取向的一致性和固定性,并表现出优异的机械强度。