Liquid crystal alignment agent composition, method of preparing liquid crystal alignment film, and liquid crystal alignment film, and liquid crystal display using the same

A liquid crystal alignment agent composition comprising:

• a copolymer for liquid crystal alignment agent containing a first repeating unit including at least one selected from the group of a repeating unit represented by Chemical Formula 1, a repeating unit represented by Chemical Formula 2, or a repeating unit represented by Chemical Formula 3, and a second repeating unit including at least one selected from the group of a repeating unit represented by Chemical Formula 4, a repeating unit represented by Chemical Formula 5, or a repeating unit represented by Chemical Formula 6;
• and
• a crosslinker compound represented by Chemical Formula 11:
• at least one of R1 and R2 is an alkyl group having 1 to 10 carbon atoms and the other is hydrogen,
• at least one of R3 and R4 is an alkyl group having 1 to 10 carbon atoms and the other is hydrogen, and
• X1 to X6 are each independently a tetravalent organic group represented by any one of Chemical Formula 7,
• in the Chemical Formula 7,
• R7 to R12 are each independently hydrogen or an alkyl group having 1 to 6 carbon atoms,
• L1 is any one selected from a single bond, —O—, —CO—, —COO—, —S—, —SO—, —SO2—, —CR13R14—, —(CH2)Z—, —O(CH2)ZO—, —COO(CH2)ZOCO—, —CONH—, or phenylene,
• R13 and R14 in the L1 are each independently hydrogen, an alkyl group having 1 to 10 carbon atoms or a haloalkyl group having 1 to 10 carbon atoms,
• Z in the L1 is an integer of 1 to 10,
• Y1 to Y3 are each independently a divalent organic group represented by Chemical Formula 8,
• in the Chemical Formula 8,
• at least one of Q1 to Q8 is nitrogen and the others are carbon,
• at least one of L2 and L4 is one of —CON(R15)—, —N(R16)CO— and the other is a direct bond,
• L3 is a direct bond or a divalent functional group,
• R15 to R16 are each independently an alkyl group having 1 to 20 carbon atoms or hydrogen, and
• n is an integer of at least 1,
• Y4 to Y6 are each independently a divalent organic group different from the divalent organic group represented by the Chemical Formula 8,
• in the Chemical Formula 11,
• A1 is a monovalent to a tetravalent functional group,
• j is an integer of 1 to 4,
• L5 and L6 are same or different from each other, and each independently, an alkylene group having 1 to 10 carbon atoms or an arylene group having 6 to 20 carbon atoms, and
• R17 and R18 are each independently a silicon-containing monovalent functional group.