Liquid crystal alignment agents, liquid crystal alignment films and their manufacturing methods, liquid crystal elements, liquid crystal display devices, and polymers

Abstract

This invention provides a liquid crystal element with minimal change in liquid crystal alignment even after prolonged backlighting and high reliability. The liquid crystal alignment agent contains a polymer (P) having a partial structure represented by formula (1). In the formula, Rβ is a monovalent hydrocarbon group (1-10 carbon atoms), cyano, nitro, chlorine atom, bromine atom, iodine atom, -SiR2R3R4, -P(=O)R2R3, -C≡CR2, or -NR2R3; any methylene group in a monovalent hydrocarbon group (2-10 carbon atoms) is substituted with -O-, -S-, or -NR2- to form a monovalent group Rω1; or any hydrogen atom in Rω1 or a monovalent hydrocarbon group (1-10 carbon atoms) is substituted with a halogen atom, cyano, hydroxyl, amino, thiol, or nitro group to form a monovalent group. Rα is a hydrogen atom, a monovalent hydrocarbon group (1-10 carbon atoms), etc.

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