| 摘要 |
PURPOSE:To enable imide ring closure at a low temp. and to obtain a liq. crystal display device fitted with polyimide-based orienting films having superior orienting property and not causing bleeding or sticking by using polymer films based on polyimide having a specified structure as orienting films. CONSTITUTION:Polymer films based on polyimide consisting of diamine components including arom. diamine compds. separately having structural units represented by general formulae I, II and tetracarboxylic acid dianhydride are formed as orienting films on substrates each having an electrode. The ratio between the diamine components and the tetracarboxylic acid dianhydride is not especially limited but the pref. molar ratio is 1.0:(0.9-1.1). The amt. of the arom. diamine compds. used is not especially limited but the compds. are preferably used by >=70 mol% of the total amt. of the diamine components. When a copolymer contg. <70 mol% of the arom. diamine compds. is used, bleeding and sticking are liable to occur. |
