Synthesis of 3,6-di4-n-alkyloxyphenylpyromellitic dianhydride, aromatic polyimides prepared therefrom, and liquid crystal display device comprising said polyimide

摘要

The present invention is 3,6-di [4- (n- alkyl) phenyl; Leet pie romel dianhydride and a manufacturing method represented by the general formula (1); And a method of manufacturing the polyimide represented by the formula (3) is prepared by the use of a dianhydride monomer; And it relates to a liquid crystal device having an alignment film covers containing the polyimide according to the present invention 3,6-di [4- (n- alkyl) phenyl; Leet pie romel dianhydride is polyimide, polyimide is compared with the jopi rolron, cross-linked polyester or polyamide are useful as monomers for polymer synthesis, such as, in particular, polyimides conventional aromatic polyester produced from the dianhydride represented by the formula (1) (pi romel discrete imide) horizontal liquid crystal display device because Genie excellent dissolution property in an organic solvent as well as can be processed directly without going through the polyamic acid the polyimide precursor, having an alignment layer including the polyimide is excellent in thermal stability of alignment, to the excellent orientation properties it would be highly useful for the production of a liquid crystal display element and the liquid crystal alignment excellent wide viewing angle. ; Formula 1 ; Wherein, R represents an alkyl group of C ₁ to C _24.; 3,6-di [4- (n- alkyl) phenyl; Leet pie romel dianhydride, a polyimide, a soluble, the liquid crystal alignment film