The invention relates to a liquid crystal alignment agent comprising a polymer composition (A) and a solvent (B); wherein the polymer composition (A) is obtained by reacting a mixture comprising a tetracarboxylic acid dianhydride component (a) and a diamine component (b). The liquid crystal alignment agent has the advantage of low moisture absorption. The invention also provides a liquid crystal alignment film made by the liquid crystal alignment agent as mentioned above and a liquid crystal display element comprising the liquid crystal alignment film.
A liquid crystal alignment agent, a liquid crystal alignment film, and a liquid crystal display device are provided. The liquid crystal alignment agent includes a polymer composition (A-1) and a solvent (B). The polymer composition (A-1) is obtained by reacting a tetracarboxylic acid dianhydride compound (a) with a diamine compound (b). The diamine compound (b) includes at least one type of diamine (b-1) represented by formula (I) and at least one type of diamine (b-2) having the structure represented by formula (II). The liquid crystal alignment agent can be made into a liquid crystal display device having good uniformity of pretilt angle after ultraviolet irradiation.