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

摘要

Provided are: a liquid crystal aligning agent which is capable of forming a liquid crystal alignment film that has high transmittance and high rubbing resistance, while achieving an improvement in display failure over a wide temperature range; a liquid crystal alignment film; and a liquid crystal display element. A liquid crystal aligning agent which contains a polyimide precursor that is obtained by reacting a diamine containing from 20% by mole to 100% by mole (inclusive) of a diamine represented by formula (1) with a tetracarboxylic acid derivative containing 50% by mole or more but less than 100% by mole of an aromatic tetracarboxylic acid derivative, or alternatively a polyimide precursor that is obtained by reacting a diamine containing 20% by mole or more but less than 100% by mole of a diamine represented by formula (1) with a tetracarboxylic acid derivative containing from 50% by mole to 100% by mole (inclusive) of an aromatic tetracarboxylic acid derivative. (In the formula, X represents O or S; each of Y1 and Y2 represents a single bond, -O-, -S-, -OCO- or COO-; and each of R1 and R2 represents an alkylene group having 1-3 carbon atoms.)