| abstract |
In order for the liquid crystal display aligned film to have the required properties, a method by introducing amide group to main chain of polyimide for forming the aligned film to increase dielectric constant and improve the electrical properties of aligned film is suggested. However, the soluibity of polyimide with amide group wherein the N is not substituted to solvent is low. By using diamine of formula (1) as the raw material to manufacture polyimide, the aforementioned problem can be solved. R1 is C1 to 30 alkyl group wherein any -GH2- can be substituted by phenylene, cyclohexene, condensed ring group of 2 valent, heterocycle of 2 valent, -O-, -OCO-, -COO or -CH=CH-. X1 and X2 are single bond or C1 to 20 akiylene wherein any -GH2- can be substituted by phenylene, cyclohexene, condensed ring group of 2 valent, heterocycle of 2 valent, -O-, -S-, -OCO-, -COO or -CH=CH-. |