POLYIMIDE PRECURSOR MODIFIED WITH DICARBOXYLIC ACID ANHYDRIDE, IMIDIZED POLYIMIDE AND LIQUID CRYSTAL ALIGNING AGENT USING IT

摘要

To provide a polyimide precursor and/or polyimide which has an excellent solubility in various organic solvents, and with which a liquid crystal alignment film can be obtained which is excellent in a rubbing resistance and which is hardly deteriorated even by irradiation with backlight.;A polyimide precursor having its terminal amino group modified with at least one alicyclic epoxydicarboxylic acid anhydride selected from the group consisting of compounds of the formulae [1] and [2], or a polyimide obtained by imidizing it:; ;wherein Y is a C_1-2 alkylene or an oxygen atom, and R¹ is a hydrogen atom or an organic group represented by —X¹—X²—X³ , wherein X¹ is a single bond or —CH₂—, X² is a single bond or -0-, and X³ is a C_1-20 alkyl group, a C_1-20 haloalkyl group or a C_1-20 alkyl group containing a cyano group.