| 摘要 |
<p>PURPOSE:To obtain a liquid-crystal display element which has superior transparency without coloring and an inconspicuous nesa pattern, by forming a liquid-crystal orientation film by using a specific hydrazide copolymer. CONSTITUTION:A dibasic acid hydrazide compound (A) (e.g., dihydrazide isophthalate) shown by the formula (where R is an aromatic compound or aliphalate compound), a diamine compound (B) (e.g., p-phenylene-diamine), and tetracarboxylic dianhydride (C) (e.g., pyromellitic dianhydride) are stirred in an organic solvent at about 10 deg.C for several hours to be condensed, forming copolymer. Next, the obtained polymer solution is diluted to a concentration of about 5-10wt% and applied onto an electrode substrate, which is heated at 150-300 deg.C to remove the solvent; after a film of the polymer is formed by closing the ring, the orientation film is formed by rubbing.</p> |
