LIQUID CRYSTAL ALIGNMENT TREATMENT AGENT, LIQUID CRYSTAL ALIGNMENT FILM, AND LIQUID CRYSTAL DISPLAY ELEMENT EQUIPPED WITH THE LIQUID CRYSTAL ALIGNMENT FILM

摘要

Disclosed are: a liquid crystal alignment treatment agent which enables the production of a liquid crystal alignment film that does not undergo the decrease in a voltage holding ratio even when exposed to light; and a novel diamine which can be used for the production of a polymer that can be contained in a liquid crystal alignment treatment agent. The liquid crystal alignment treatment agent comprises at least one polymer selected from the group consisting of a polyimide precursor produced from a diamine represented by formula [1] and a polyimide produced by the imidization of the polyimide precursor. (In formula [1], X represents an organic group represented by formula [2]; Y1 and Y2 independently represent a benzene ring or a cyclohexane ring; p and q independently represent an integer of 0 or 1; S1 and S2 independently represent a single bond or a bivalent linking group, wherein S1 represents a single bond when p is 0 and S2 represents a single bond when q is 0; and R1 represents a hydrogen atom, a fluorine atom, an alkyl or fluoroalkyl group having 1 to 22 carbon atoms, or a steroid group.) (In formula [2], C1 and C2 independently represent a single bond or a bivalent organic group; A represents a thermally detachable organic group; B1 represents a bivalent organic group selected from -CH2-, -O-, -NH- and -S-; n represents an integer of 0 or 1; and the direction of the bonding of X is not limited.)