Diaminobenzene derivative, polyimide obtained therefrom, and liquid-crystal alignment film
申请人:Nissan Chemical Industries, Ltd.
公开号:US06740371B1
公开(公告)日:2004-05-25
An alkyldiamine having excellent polymerization reactivity, a polyimide comprising it as a constituting element, and a liquid crystal alignment film excellent in uniformity of liquid crystal alignment, are presented. Namely, the present invention relates to a diaminobenzene derivative represented by the following general formula (1) and to a polyimide obtained by reacting a diamine containing at least 1 mol % of the diaminobenzene derivative represented by the general formula (1), with at least one compound selected from a tetracarboxylic. dianhydride and its derivatives, to obtain a polyimide. precursor having a reduced viscosity of from 0.05 to 5.0 dl/g (in N-methylpyrrolidone at a temperature of 30° C., concentration: 0.5 g/dl) and ring-closing it, and having a repeating unit represented by the general formula (2). Further, the present invention relates to a liquid crystal alignment film containing at least 1 mol % of the above repeating unit.
本发明提供一种具有优异的聚合反应性的烷基二胺,以其为构成元素的聚酰亚胺,以及液晶取向膜在液晶取向均匀性方面具有优异性能。具体而言,本发明涉及一种由以下通式(1)表示的二氨基苯衍生物,以及通过将含有至少1摩尔%的由通式(1)表示的二氨基苯衍生物的二胺与至少选择一种四羧酸二酐及其衍生物反应而得到的聚酰亚胺。所述聚酰亚胺前体具有降低粘度为0.05至5.0dl/g(在30℃下,浓度为0.5g/dl的N-甲基吡咯烷酮中),并经环合,其重复单元由通式(2)表示。此外,本发明涉及一种含有至少1摩尔%上述重复单元的液晶取向膜。