LIQUID CRYSTAL ALIGNING AGENT, LIQUID CRYSTAL ALIGNMENT FILM USING SAME, AND LIQUID CRYSTAL DISPLAY ELEMENT

摘要

Disclosed is a liquid crystal aligning agent which is capable of providing a liquid crystal alignment film that has excellent in-plane uniformity of pretilt angles, while exhibiting excellent resistance to high temperatures and high humidities and excellent resistance to the heat and light generated by the backlight. Specifically disclosed is a liquid crystal aligning agent which contains a soluble polyimide that is obtained by imidizing a polyamic acid component that is obtained by causing a diamine component that contains a diamine represented by general formula (1) and a diamine represented by general formula (2) to react with a tetracarboxylic acid dianhydride. (In general formula (1), X represents an aromatic ring; R1 represents an alkylene group having 1-5 carbon atoms; and R2 represents a hydrocarbon group having 1-4 carbon atoms.) (In general formula (2), R1 represents a single bond or a divalent organic group; X1, X2 and X3 each independently represents a benzene ring or a cyclohexane ring; p, q and r each independently represents an integer of 0 or 1; and R2 represents a hydrogen atom, an alkyl group having 1-22 carbon atoms or a divalent organic group having a steroid skeleton and 12-25 carbon atoms.)