A novel optically anisotropic film which consists of discotic liquid crystalline molecules (2, 3, 6, 7, 10, 11-triphenylenehexayl hexakis [4- (4-acryloyloxybutyloxy) benzoate] (THABB)) aligned and fixed in hybrid mode was invented. The discotic liquid crystalline molecules are polymerizable discotic nematic liquid crystalline triphenylene derivatives. The film is exceedingly useful for improvement in viewing angle of TN LCD.
In our study, N
D (discotic nematic) phase was the most suitable liquid crystalline phase for preparation of the optically anisotropic film. N
D phase was frequently shown by 2, 3, 6, 7, 10, 11-triphenylenehexayl hexakis (4-alkoxybenzoate) derivatives. Some modification of the alkoxy group brought about disappearance of N
D phase. Introduction of an acryloyl group to the alkoxy group at the terminal position, however, did not caused disappearance of the N
D phase.
Synthesis of THABB on a large scale included problems of purity in a few steps. Introduction of new synthetic methods and refining the reaction condition in the small scale case, however, has resulted in highly pure THABB producing process.
抄録全体を表示