| 摘要 |
Provided is a liquid crystal alignment film which suppresses afterimages caused by AC drive in an IPS- or FFS-driven liquid crystal display element, and which exhibits fast relaxation of residual charges accumulated by DC voltage. Also provided is a liquid crystal aligning agent suitable for use in a photo-alignment process in order to obtain the liquid crystal alignment film. The liquid crystal aligning agent suitable for use in a photo-alignment process comprises: at least one polymer (component (A)) selected from polyamic acid and imidized polyamic acid polymers obtained by reacting a tetracarboxylic dianhydride provided with a specific structure having a cyclobutane backbone, and a diamine compound that has at least one diamine selected from the group having the structures represented by formulae (D-1) and (D-2), and that has an amino group protected by a thermally cleavable group which is replaced by hydrogen at heating; at least one polymer (component (B)) selected from polyamic acid and imidized polyamic acid polymers obtained by reacting a tetracarboxylic dianhydride and a diamine compound which contains a diamine having a nitrogen-containing aromatic heterocycle such as pyridine; and an organic solvent. |
