Treating agent for liquid crystal alignment using the same polyimide and the polyimide precursor is modified by a dicarboxylic acid anhydride, imidized

摘要

The good solubility in various organic solvents, in particular, to provide a polyimide and / or the polyimide precursor liquid crystal alignment film which is excellent in rubbing resistance, degradation hardly occurs even by the irradiation of the backlight can be obtained. [1], it or polyimide precursor is characterized in that the cycloaliphatic epoxy dicarboxylic acid anhydride of one terminal amino group is modified and at least selected from the group consisting of general formulas [2] formula polyimide obtained by imidization. [Formula 1] (Wherein, Y represents an oxygen atom or an alkylene of 2 carbon atoms or ^{1, R} 1 represents an organic group represented by ^-X 1 ^-X 2 ^{-X 3} or hydrogen atom, wherein ^{X 1} is a single ₂ -CH bond or - is a single bond or ^{X 2} is -O-, ^{X 3} carbon atoms containing a cyano group, an alkyl group having 1 to 20 carbon atoms, or a haloalkyl group having a carbon number of 1 to 20 . representing an alkyl group of 1 to 20)