To provide a liquid crystal alignment treating agent to obtain a liquid alignment film of polyamide type which, in its applications to various display devices employing nematic liquid crystal, is excellent in voltage retention, has a reduced charge accumulation and is excellent in durability against rubbing treatment, and a liquid crystal display device employing it.
A liquid crystal alignment treating agent to obtain an alignment film for nematic liquid crystal by rubbing treatment after forming a coating film, characterized in that it comprises at least one polymer selected from a polyamic acid obtained by reacting one or more tetracarboxylic dianhydrides with one or more diamines comprising at least one diamine having a structure represented by the following formula (I), and a polyimide obtained by cyclodehydration of such a polyamic acid; and a liquid crystal display device obtained by applying the liquid crystal alignment treating agent to a pair of substrates having electrodes, to form coating films, rubbing the coating film surfaces to form liquid crystal alignment films, and sandwiching nematic liquid crystal between the liquid crystal alignment films formed on the pair of substrates:
wherein X is a hydrogen atom or a monovalent organic group, and each of Y
1
and Y
2
is a primary amino group or a monovalent organic group having one primary amino group.
提供一种用于获得聚酰胺型液晶配向膜的液晶配向处理剂,该液 晶配向膜在应用于采用向列液晶的各种显示设备时,具有优异的保压性、减 少电荷积累和优异的耐摩擦处理耐久性,并提供一种采用该液 晶配向膜的液晶显示设备。
一种液晶配向处理剂,用于在形成涂膜后通过摩擦处理获得向列液晶的配向膜,其特征在于它包括至少一种聚合物,选自一种或多种四
羧酸二酐与一种或多种二胺(其中至少一种二胺具有下式(I)表示的结构)反应得到的聚酰胺,以及通过这种聚酰胺的环脱
水反应得到的聚
酰亚胺;以及一种液晶显示装置,通过在一对具有电极的基板上涂敷液晶配向处理剂以形成涂膜,摩擦涂膜表面以形成液晶配向膜,并在一对基板上形成的液晶配向膜之间夹层向列液晶而获得:
其中 X 是氢原子或一价有机基团,Y
1
和 Y
2
是伯
氨基或具有一个伯
氨基的一价有机基团。