| abstract |
In order to express the properties required for the liquid crystal aligning film, an oriented film which improves the electrical properties by introducing an amide bond into the polyimide main chain constituting the alignment film to increase the dielectric constant has been proposed, but such an N-unsubstituted amide group Polyimide has a problem of low solubility in a solvent.n n n The said subject is solved by using the diamine represented by Formula (1) as a raw material of polyimide manufacture. R 1 is any of the -CH 2 - carbon atoms which may be substituted by a phenylene, cyclohexylene, bivalent condensed group, a divalent heterocyclic group, -O-, -OCO-, -COO or -CH = CH- alkyl of 1~30, X 1 and X 2 is a single bond or an arbitrary -CH 2 - is phenylene, cyclohexylene, bivalent condensed group, a divalent heterocyclic group, -O-, -S-, -OCO Or an alkylene having 1 to 20 carbon atoms which may be substituted with-, -COO or -CH = CH-.n n n n n n n n Liquid crystal display device, liquid crystal aligning film, diamine, residual charge, voltage retention, pretilt angle |