Liquid crystal aligning agent composition, method for producing liquid crystal alignment film using same, and liquid crystal alignment film using same

A liquid crystal aligning agent composition comprising:

• i) a first polymer for a liquid crystal aligning agent including two or more repeating units selected from the group consisting of a repeating unit represented by Chemical Formula 1, a repeating unit represented by Chemical Formula 2, and a repeating unit represented by Chemical Formula 3, wherein the first polymer includes the repeating unit represented by Chemical Formula 1 in an amount of 36.4 mol % to 74 mol % with respect to a total of the repeating units represented by the following Chemical Formulae 1 to 3,
• ii) a second polymer for a liquid crystal aligning agent including a repeating unit represented by Chemical Formula 4,
• iii) a compound having two or more epoxy groups in a molecule, and
• iv) a phosphine-based compound represented by Chemical Formula 5,
• wherein a weight ratio between the first polymer for a liquid crystal aligning agent and the second polymer for a liquid crystal aligning agent is 2:8 to 8:2:
• wherein, in Chemical Formulae 1 to 5,
• at least one of R1 and R2 is a C1-10 alkyl, and the rest is hydrogen,
• R3 and R4 are each independently hydrogen or a C1-10 alkyl,
• A1, A2, and A3 are each independently hydrogen, a C1-20 alkyl, a C3-20 cycloalkyl, a C6-20 aryl, or a C6-20 aryl substituted with at least one C1-20 alkyl group,
• X1 is a tetravalent organic group represented by Chemical Formula 6,
• X2, X3, and X4 are each independently a tetravalent organic group derived from a hydrocarbon having 4 to 20 carbon atoms, or a tetravalent organic group in which at least one H in the tetravalent organic group is substituted with a halogen, or at least one —CH2— is replaced by —O—, —CO—, —S—, —SO—, —SO2—, or —CONH— such that oxygen or sulfur atoms are not directly linked, and
• wherein, in Chemical Formula 6,
• R5 to R8 are each independently hydrogen or a C1-6 alkyl,
• Y1, Y2, Y3, and Y4 are each independently a divalent organic group represented by Chemical Formula 7,
• wherein, in Chemical Formula 7,
• 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 between 0 and 4, and
• 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 between 1 and 10,
• m is an integer between 0 and 3.