申请人:Nagao Masato
公开号:US20120088888A1
公开(公告)日:2012-04-12
To provide a novel polyimide precursor or polyimide which can provide a liquid crystal alignment film having a low volume resistivity, a liquid crystal aligning agent containing these polymers, a liquid crystal alignment film and a novel diamine which is useful as the starting material of these polymers.
A polyimide precursor having polymerized units represented by the formula (1), and characterized by satisfying any one of the following (i) to (iii):
(i) the structure of X, Y or each of them in formula (1) has a group represented by the following formula (2);
(ii) R
2
, R
3
or each of them in formula (1) is a group represented by the following formula (2);
(iii) the structure of X, Y or each of them in formula (1) has a group represented by the following formula (2), and R
2
, R
3
or each of them is a group represented by following formula (2):
提供一种新型聚酰亚胺前体或聚酰亚胺,可提供具有低体积电阻率的液晶取向膜,包含这些聚合物的液晶取向剂,液晶取向膜和一种新型二胺,作为这些聚合物的起始材料。聚酰亚胺前体具有由式(1)表示的聚合单元,其特征在于满足以下任一条件(i)至(iii)中的任一条件:(i)式(1)中的X、Y或它们中的每一个具有以下式(2)表示的基团的结构;(ii)式(1)中的R2、R3或它们中的每一个是以下式(2)表示的基团;(iii)式(1)中的X、Y或它们中的每一个具有以下式(2)表示的基团的结构,而R2、R3或它们中的每一个是以下式(2)表示的基团。