申请人:SAGAMI CHEMICAL RESEARCH CENTER
公开号:EP0635533A1
公开(公告)日:1995-01-25
A liquid crystal aligning agent is provided which contains a polyimide comprising repeating units of general formula (VII) and optionally general formula (V):
where A³ represents a tetravalent organic group of constituting a tetracarboxylic acid, A⁴ represents a divalent organic group of constituting a diamine, B represents a divalent organic group, R¹ and R⁵ may be the same or different and each represents an alkyl group, a substituted alkyl group, a phenyl group or a substituted phenyl group, m represents an integer of 1 or more, and n represents an integer of from 1 to 6; provided that n, m, A³, A⁴, B, R¹ and R² may optionally be different ones in every repeating unit, and the combination of the repeating units are:
a) a unit of formulae (V) and (VII), or
b) a unit of formulae (VII)
and the polyimide having a weight-average molecular weight of 10,000 or more and having a siloxane group in the side chain thereof.
液晶对准剂含有一种聚酰亚胺,该聚酰亚胺由通式 (VII) 和通式 (V) 的重复单元组成:
其中 A³ 代表构成四羧酸的四价有机基团,A⁴ 代表构成二胺的二价有机基团,B 代表二价有机基团,R¹ 和 R⁵ 可以相同或不同,各自代表烷基、取代的烷基、苯基或取代的苯基,m 代表 1 或 1 以上的整数,n 代表 1 至 6 的整数;条件是 n、m、A³、A⁴、B、R¹ 和 R² 在每个重复单元中可以是不同的,且重复单元的组合为:
a) 式(V)和(VII)的单元,或
b) 式(VII)的单元
且聚酰亚胺的重量平均分子量为 10,000 或以上,其侧链中含有硅氧烷基团。