| 摘要 |
PURPOSE: A 2,2'-bis(3-aminophenyl)hexafluoropropane derivative, its preparation method, an aromatic polyimide prepared by using the derivative, its preparation method, a liquid crystal aligning agent composition containing the polyimide and a LCD device provided with the liquid crystal alignment layer derivative from the composition are provided, to improve the vertical alignment and electrical characteristics of liquid crystal and to reduce residual removing time. CONSTITUTION: The 2,2'-bis(3-aminophenyl)hexafluoropropane derivative is a 2,2'-bis{3-amino-4-{¥ø-£4-(4-R-phenyl)phenoxy|alkyloxy}phenyl}hexafluoropropane represented by the formula 1, wherein m is an integer of 2-24; and R is H, a cyano group, a halogen atom, or a unsubstituted or halogen-substituted linear or branched alkyl or alkoxy group of C1-C12. The aromatic polyimide is prepared by reacting the compound of the formula 1 and an aromatic dianhydride in a polar solvent under inert condition at 150-200 deg.C for 12-48 hours. Preferably the polar solvent is N-methylpyrrolidone, N,N-dimethylacetamide or m-cresol.
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