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

A liquid crystal alignment film comprising a liquid crystal alignment agent composition comprising a first polymer for a first liquid crystal alignment agent including a repeating unit represented by Chemical Formula 1 and one or more repeating units selected from the group of a repeating unit represented by Chemical Formula 2 and a repeating unit represented by Chemical Formula 3, wherein the repeating unit represented by Chemical Formula 1 is included in an amount of 5 mol % to 74 mol % with respect to a total of the repeating units represented by the following Chemical Formulae 1 to 3;

• and
• a second polymer for a second liquid crystal alignment agent including one or more repeating units selected from the group of a repeating unit represented by Chemical Formula 4, a repeating unit represented by Chemical Formula 5, and a repeating unit represented by Chemical Formula 6:
• wherein, in the Chemical Formulae 1 to 6,
• R1, R2, R3, and R4 are each independently hydrogen or a C1-10 alkyl, provided that R1 and R2 are not both hydrogen, and that R3 and R4 are not both hydrogen,
• X1 is a tetravalent organic group represented by Chemical Formula 7:
• wherein, in the Chemical Formula 7,
• R5, R6, R7, and R8 are each independently hydrogen or a C1-6 alkyl,
• X2, X3, X4, X5, and X6 are each independently a tetravalent organic group derived from a hydrocarbon having 4 to 20 carbon atoms, or a tetravalent organic group derived from a hydrocarbon having 4 to 20 carbon atoms wherein one or more of H is substituted with a halogen, or one or more of —CH2— is substituted with —O—, —CO—, —S—, —SO—, —SO2—, or —CONH— to prevent direct binding with oxygen or sulfur atoms in the tetravalent organic group,
• in the Chemical Formulae 1 to 3,
• Y1 to Y3 are each independently a divalent organic group represented by Chemical Formula 8:
• wherein, in the Chemical Formula 8,
• R9 and R10 are each independently a halogen, a cyano, a C1-10 alkyl, a C2-10 alkenyl, a C1-10 alkoxy, a C1-10 fluoroalkyl, or a C1-10 fluoroalkoxy,
• p and q are each independently an integer of 0 to 4,
• L1 is a single bond, —O—, —CO—, —S—, —SO2—, —C(CH3)2—, —C(CF3)2—, —CONH—, —COO—, —(CH2)z—, —O(CH2)zO—, —O (CH2)z—, —OCH2—C(CH3)2—CH2O—, —COO—(CH2)z—OCO—, or —OCO—(CH2)z—COO—, wherein z is an integer of 1 to 10,
• k and m are each independently an integer of 1 to 3,
• n is an integer of 0 to 3,
• in Chemical the Formulae 4 to 6,
• Z1, Z2, and Z3 are each independently a divalent organic group represented by Chemical Formula 9:
• wherein, in the Chemical Formula 9,
• A1 is an element of nitrogen, phosphorus, arsenic, tin or bismuth,
• R11 is hydrogen or a C1-10 alkyl,
• a is an integer of 1 to 3, and
• A2, A3, A4, and A5 are nitrogen or carbon, provided that at least one of A2 or A5 is nitrogen and the other is carbon and A3 and A4 are carbon,
• wherein X2, X3, X4, X5, and X6 are each independently a tetravalent
• organic group represented by Chemical Formula 10:
• [Chemical Formula 10]
• wherein, in Chemical Formula 10,
• R5, R6, R7, and R8 are each independently hydrogen or a C1-6 alkyl,
• R12 and R13 are each independently hydrogen or a C1-10 alkyl, and
• L2 is any one selected from the group consisting of a single bond, —O—, —CO—, —S—, —SO—, —SO2—, —CR14R15—, —CONH—, —COO—, —(CH2)b—, —O—(CH2)bO—, —COO—(CH2)b—OCO—, —HN—(CH2)b—NH—, —R14N—(CH2)b—NR15—, phenylene, and combinations thereof, wherein R14 and R15 are each independently hydrogen, a C1-10 alkyl, or a C1-10 fluoroalkyl, and each b is independently an integer of 1 to 10,
• wherein, Y1 of the repeating unit represented by Chemical Formula 1 is connected to an adjacent repeating unit represented by Chemical Formula 1 as N—Y1—N—, or to an adjacent repeating unit represented by Chemical Formula 2 or 3 as —HN—Y1—N—;
• Y2 of the repeating unit represented by Chemical Formula 2 is connected to an adjacent repeating unit represented by Chemical Formula 2 or 3 as —HN—Y2—NH—, or to an adjacent repeating unit represented by Chemical Formula 1 as —N—Y2—NH—;
• and Y3 of the repeating unit represented by Chemical Formula 3 is connected to an adjacent repeating unit represented by Chemical Formula 2 or 3 as —NH—Y3—NH— or to an adjacent repeating unit represented by Chemical Formula 1 as —N—Y3—NH—,
• wherein, Z1 of the repeating unit represented by Chemical Formula 4 is connected to an adjacent repeating unit represented by Chemical Formula 4 as —N—Z1—N—, or to an adjacent repeating unit represented by Chemical Formula 5 or 6 as —HN—Z1—N—;
• Z2 of the repeating unit represented by Chemical Formula 5 is connected to an adjacent repeating unit represented by Chemical Formula 5 or 6 as —HN—Z2—NH—, or to an adjacent repeating unit represented by Chemical Formula 4 as —N—Z2—NH—;
• and Z3 of the repeating unit represented by Chemical Formula 6 is connected to an adjacent repeating unit represented by Chemical Formula 5 or 6 as —NH—Z3—NH— or to an adjacent repeating unit represented by Chemical Formula 4 as —N—Z3—NH—, and
• wherein the liquid crystal alignment film is prepared by an alignment treatment including irradiating with polarized light or rubbing in one direction, without preceding or concurrent curing, prior to a curing heat treatment.