LIQUID CRYSTAL ALIGNMENT AGENT CONTAINING POLYAMIC ACID ESTER AND POLYAMIC ACID, AND LIQUID CRYSTAL ALIGNMENT FILM

摘要

Disclosed is a liquid crystal alignment agent which can reduce microscopic irregularities on the surface of liquid crystal alignment films, improves liquid crystal alignment properties as well as having improved electrical characteristics, and provides increased reliability. The liquid crystal alignment agent contains a polyamic acid ester having a repeating group represented by general formula (1), a polyamic acid having a repeating group represented by general formula (2), and an organic solvent. The liquid crystal alignment agent is characterised in the weight average molecular weight of the polyamic acid ester being smaller than the weight average molecular weight of the polyamic acid. (In general formulae (1, 2) X1 and X2 independently represent a tetravalent organic group, and Y1 and Y2 independently represent a divalent organic group. R1 represents a C1-5 alkyl group, A1 and A2 independently represent a hydrogen atom or an optionally substituted C1-10 alkyl group, alkenyl group or alkynyl group.)