Being poriamitsuku acid and polyimide, and is applied to liquid crystal orientation medicine null display the liquid crystal orientation medicine which

摘要

PROBLEM TO BE SOLVED: To provide a polyamic acid and a polyimide prepared by using an aromatic diamine compound and a liquid crystal aligning agent.SOLUTION: A liquid crystal aligning agent contains a polyamide obtained by polymerization reaction of a diamine compound with a tetracarboxylic acid or a dianhydride of tetracarboxylic acid. The diamine compound includes an aromatic diamine represented by the following formula. (wherein any two of Rto Rare a primary amino group and the others are each independently a hydrogen atom or a monovalent substituent other than primary amino group, Ris an alkyl group having 1 to 20 carbon atoms, a monovalent alicyclic substituent having 3 to 40 carbon atoms, a monovalent aromatic substituent or a monovalent heterocyclic substituent having 6 to 51 carbon atoms, Xand Xare each independently a divalent binding group selected from the group consisting of a single bond or an ether group, a ketone group, an ester group, an amide group and a secondary amino group, and Xand Xare each independently a linear alkylene group having 1 to 3 carbon atoms.)