Liquid crystal alignment agent, liquid crystal alignment film manufactured using the same, and liquid crystal display device including the liquid crystal alignment film

A liquid crystal alignment agent, comprising

• a polymer comprising polyamic acid including a repeating unit represented by the following Chemical Formula 1, polyimide including a repeating unit represented by the following Chemical Formula 2, or a combination thereof:
• wherein, in Chemical Formulae 1 and 2,
• X1 and X2 are the same or different and are each independently a tetravalent organic group derived from alicyclic acid dianhydride or aromatic acid dianhydride, and
• Y1 and Y2 are the same or different and are each independently a divalent organic group derived from diamine, wherein the diamine includes a diamine or a combination thereof represented by the following Chemical Formula 3,
• wherein, in Chemical Formula 3,
• A1 is a single bond or C1 to C2 alkylene,
• A2 is substituted or unsubstituted C1 to C30 alkylene or C1 to C10 alkylene in which at least one —CH2— group thereof is independently replaced with —O—, —OOC—, —COO—, —OCOO—, —NHCO—, —CONH— or —CO—,
• A3 is a single bond, 0, SO2, or C(R103)(R104), wherein R103 and R104 are the same or different and are independently hydrogen or substituted or unsubstituted C1 to C6 alkyl,
• R1 to R4 are the same or different and are each independently hydrogen, substituted or unsubstituted C1 to C30 alkyl, substituted or unsubstituted C6 to C30 aryl, or substituted or unsubstituted C2 to C30 heteroaryl,
• R5 is substituted or unsubstituted C1 to C30 alkylene or C1 to C30 alkylene in which at least one —CH2— group thereof is replaced with —CO—, —CO—O—, —NW—, —NWCO—, —CO—NW— or —CH═CH—, wherein W is hydrogen or C1 to C10 alkyl, with the proviso that oxygen atoms are not directly bound to one another,
• Q1, Q2 and Q3 are each independently hydrogen or halogen, and
• n is an integer ranging from 2 to 4,
• wherein the term substituted refers to one or more substituents selected from the group consisting of halogen, hydroxy, nitro, cyano, amino, amidino, hydrazine, hydrazone, carboxyl, alkyl, haloalkyl, alkoxy, alicyclic organic groups, aryl, alkenyl, alkynyl, heteroaryl, heterocycloalkyl, and combinations thereof and wherein the terms heteroaryl and heterocycloalkyl are aryl and cycloalkyl, respectively, including 1 to 3 heteroatoms selected from the group consisting of N, O, S, Si, P, and combinations thereof.