LIQUID CRYSTAL ALIGNING AGENT CONTAINING THERMALLY CLEAVABLE GROUP-CONTAINING COMPOUND, AND LIQUID CRYSTAL ALIGNMENT FILM

摘要

Disclosed is a liquid crystal aligning agent which is capable of providing a liquid crystal alignment film that has high mechanical strength and thus exhibits excellent resistance to rubbing. The liquid crystal alignment film is highly reliable and has excellent liquid crystal aligning properties and excellent electrical characteristics such as voltage holding ratio at high temperatures and ion density, while giving a large pretilt angle. Specifically disclosed is a liquid crystal aligning agent which is characterized by containing: a polyimide precursor that is obtained by causing a diamine compound and a tetracarboxylic acid derivative to react with each other and/or a polyimide that is obtained by imidizing the polyimide precursor; and a compound that contains an amino group protected by a thermally cleavable group, which is substituted by hydrogen when heated at 80-300°C, and has an amic acid or amic acid ester structure.