A liquid crystal alignment agent capable of forming a liquid crystal display element having good resistance to ultraviolet decay and no mura effect, a liquid crystal alignment film, and a liquid crystal display element having the same are provided. The liquid crystal alignment agent includes a polymer (A), a polysiloxane (B), a polymerizable compound (C) containing a benzophenone structure, and a solvent (D). The polymer (A) is obtained by reacting a mixture. The mixture includes a tetracarboxylic dianhydride component (a1) and a diamine component (a2). The polysiloxane (B) contains a polymerizable unsaturated group, wherein the polymerizable unsaturated group includes a group represented by formula (1-1), a group represented by formula (1-2), or a combination of the two.
本发明提供了一种能够形成具有良好抗紫外线衰减性和无村效应的液晶显示元件的液晶配向剂、一种液晶配向膜以及具有该液晶配向剂的液晶显示元件。液晶配向剂包括聚合物 (A)、聚
硅氧烷 (B)、含有
二苯甲酮结构的可聚合化合物 (C) 和溶剂 (D)。聚合物(A)是通过反应混合物获得的。混合物包括四
羧酸二酐组分(a1)和二胺组分(a2)。聚
硅氧烷(B)含有可聚合的不饱和基团,其中可聚合的不饱和基团包括由式(1-1)表示的基团、由式(1-2)表示的基团或两者的组合。