abstract |
An object of the present invention is to provide a liquid crystal alignment film which satisfies various characteristics required for a liquid crystal alignment film and imparts a low pretilt angle of 1 degree or less. The solution is a liquid crystal alignment agent containing at least one selected from the group consisting of a free aliphatic tetracarboxylic dianhydride and an alicyclic tetracarboxylic dianhydride, and a diamine component. The liquid crystal alignment agent of the polyimide of the reactant, wherein the diamine component contains at least one selected from the diamines of the following formula [A], and the ruthenium imidization ratio of the polyimine is 70%. the above; Wherein P 1 and P 2 are a phenyl group or a biphenyl group, and the hydrogen on the aromatic ring may be substituted with a methyl group or a fluorine group; further, Q is a divalent organic group, and n1 and n2 are integers of 0 to 5 However, when at least one of n1 and n2 is 0, Q is an oxygen atom. |