| 摘要 |
<p> Provided are: a liquid crystal alignment agent having excellent liquid crystal alignment properties and excellent alignment stability, whereby charge accumulation due to asymmetrization of positive and negative voltages during alternating-current driving can be suppressed, and accumulated charge is rapidly relieved; a liquid crystal alignment film; and a liquid crystal display element using the same A liquid crystal alignment agent containing: a polyamic acid obtained by reacting a tetracarboxylic acid dianhydride component containing pyromellitic dianhydride, and a diamine component containing a diamine represented by formula (1) and at least one diamine selected from the group consisting of diamines represented by formula (2) and formula (3); and at least one type of polymer selected from the group consisting of imidized polymers of the polyamic acid. (In formula (2), A1 represents a divalent organic group containing a C1-10 straight-chain alkylene group; and R1 and R2 each independently represent a hydrogen atom or a C1-4 alkyl group. In formula (3), A2 represents a single bond, -O-, -S-, -NR6-, an ester bond, an amide bond, a thioester bond, a urea bond, a carbonate bond, or a carbamate bond; R6 represents a hydrogen atom, a methyl group, or a t-butoxycarbonyl group; R3 represents a C1-10 straight-chain alkylene group; and R4 and R5 each independently represent a hydrogen atom or a C1-4 alkyl group.)</p> |
