Liquid crystal aligning agent, liquid crystal alignment film, and liquid crystal display element

TL;DR: In this article, a liquid crystal aligning agent for display failure in the peripheral portion of a liquid-crystal display screen is presented. But the authors do not specify a specific formulation of the alignment agent.

Abstract: Provided is a liquid crystal aligning agent for forming a liquid crystal alignment film, which has high liquid crystal aligning properties and is not susceptible to causing a display failure in the peripheral portion of a liquid crystal display screen. A liquid crystal aligning agent which contains the following components (A), (B) and (C). Component (A): a silane represented by formula (a) Component (B): an amine which has one amino group and a nitrogen-containing aromatic heterocyclic ring in each molecule, and wherein the amino group is bonded to a divalent aliphatic hydrocarbon group or a non-aromatic cyclic hydrocarbon group Component (C): a polyimide precursor which is obtained by reacting a diamine component and a tetracarboxylic acid component with each other and/or a polyimide which is obtained by imidizing the polyimide precursor (In the formula, A 1 represents an organic group with 2-12 carbon atoms, which has a vinyl group, an epoxy group, an amino group, a mercapto group, an isocyanate group, a methacryl group, an acryl group, a ureido group or a cinnamoyl group; A 2 represents a hydrogen atom or an alkyl group with 1-5 carbon atoms; A 3 represents an alkyl group with 1-5 carbon atoms; m represents an integer of 1 or 2; n represents an integer of 0-2; p represents an integer of 0-3; and (m + n + p) is 4.)