Liquid crystal aligning agent, liquid crystal aligning film, and liquid crystal display element for photo-alignment method

摘要

Provided are: a liquid-crystal alignment material for obtaining liquid-crystal alignment films which are for use in the photo-alignment method and which, even when cleaned with a cleaning fluid, satisfactorily reduce the occurrence of image persistence; a liquid-crystal alignment film; and a liquid-crystal display element. The liquid-crystal alignment material for the photo-alignment method comprises: at least one polymer selected from among polyimide precursors represented by formula (1) and polymers obtained by imidizing the polyimide precursors; and an organic solvent. (X1 is a tetravalent organic group having a specific structure and R1 is a hydrogen atom or a C1-4 alkyl group.)