| 摘要 |
PURPOSE: To obtain a liq. crystal orienting agent good in liq. crystal orienting property, imparting a liq. crystal display element high in voltage retention and excellent in preservation stability by incorporating a specified polyamic acid or is imide polymers. CONSTITUTION: This liq. crystal orienting agent contains at least one kind selected from among the polyamic acid formed by allowing a tetracrboxylic dianhydride selected from among the compd. expressed by formula I and the compd. expressed by formula II to react with a diamine compd. shown by formula III and its imide polymers. In formula I, R<1> is a 1-3C alkyl, 1-3C alkoxyl or halogen atom, and (a) is an integer of 0 to 4. In formula II, R<2> is a 1-3C alkyl, 1-3C alkoxyl or halogen atom, and (b) is an integer of 0 to 3. In formula III, R<3> is a bivalent org. group. |
