COATING SOLUTION FOR FORMING POLYIMIDE FILM, LIQUID CRYSTAL ALIGNMENT AGENT, POLYIMIDE FILM, LIQUID CRYSTAL ALIGNMENT FILM, AND LIQUID CRYSTAL DISPLAY ELEMENT

摘要

Provided is a coating solution for forming a polyimide film, said coating solution comprising: a polymer of a polyimide precursor obtained by polymerizing a tetracarbonate component and a diamine component, and/or a polyimide formed by the imidization of the polyimide precursor; and a bifunctional compound represented by formula [A] and having a Meldrum's acid structure introduced into each of two amino groups of a diamine compound. Also provided are: a liquid crystal alignment agent comprising said coating solution; a polyimide film obtained by firing a substrate coated using said coating solution; a polyimide film comprising a polyimide in which the polymer is crosslinked using the bifunctional compound represented by formula [A]; a liquid crystal alignment film comprising the polyimide film; and a liquid crystal display element equipped with said liquid crystal alignment film. (In the formula, Y, R1 and R2 are groups specified in claims 1 and 4.)