Patent ID: 8785567

Claim:
A liquid crystal alignment agent, comprising: a polymer containing a repeating structural unit represented by the following formula (I): wherein each of P and Q is a divalent organic group; and an organic solvent for dissolving said polymer, wherein the liquid crystal alignment agent has a viscosity ranging from 8 to 35 cps at 25° C., wherein said polymer is obtained by subjecting a diamine compound to polymerization in the presence of an acidic catalyst, and wherein said diamine compound is at least one selected from the group consisting of compounds represented by the following formulas (I-1) to (I-5) and (1) to (6): wherein R 3 is a monovalent organic group having a ring structure containing a nitrogen atom selected from the group consisting of pyridine, pyrimidine, triazine, piperidine and piperazine; X is a divalent organic group; R 4a and R 4b are independently a divalent organic group having a ring structure containing a nitrogen atom selected from the group consisting of pyridine, pyrimidine, triazine, piperidine and piperazine; R 5 and R 7 are independently a divalent organic group selected from the group consisting of —O—, —COO—, —OCO—, —NHCO—, —CONH—, and —CO—; R 6 is a monovalent organic group having a group selected from the group consisting of a steroid skeleton, a trifluoromethyl group, and a fluoro group, or an alkyl group having 6 to 30 carbon atoms; X 1 and X 2 are independently a divalent organic group selected from the group consisting of an alicyclic group, an aromatic group, and a heterocyclic group; R 8 is selected from the group consisting of an alkyl group having 3 to 18 carbon atoms, an alkoxy group having 3 to 18 carbon atoms, a fluoroalkyl group having 1 to 5 carbon atoms, a fluoroalkoxy group having 1 to 5 carbon atoms, a cyano group, and halogen atoms; R 9a , R 9b , R 9c , and R 9d are independently a hydrocarbon group having 1 to 12 carbon atoms; p is an integer ranging from 1 to 3; q is an integer ranging from 1 to 20; and t is an integer ranging from 2 to 12.