Material for liquid-crystal alignment film, liquid-crystal display element, process for its production and liquid-crystal display unit

A material for a liquid-crystal alignment film which comprises:

• (i) a first polyamide having a first repeating unit represented by the following Formula (1) and having a weight-average molecular weight of from 5,000 to 200,000;
• wherein R1 is a tetravalent organic group represented by any of the following structural formulas (2), R2 is a divalent organic group, and R3 is an alkyl group having 3 to 10 carbon atoms or a fluoroalkyl group having 3 to 10 carbon atoms;
• and
• (ii) a second polyamide having a second repeating unit represented by the following Formula (3) and a third repeating unit represented by the following Formula (5), and having a weight-average molecular weight of from 5,000 to 200,000;
• wherein R4 is represented by any of the following structural formula (11), R5 is a divalent organic group, and R6 is an alkyl group having 3 to 10 carbon atoms or a fluoroalkyl group having 3 to 10 carbon atoms,
• wherein Z1 to Z8 are each any of a hydrogen atom, an alkyl group having 1 to 8 carbon atoms and an aryl group having 6 to 18 carbon atoms;
• and n is an integer of 1 to 8, m is an integer of 1 to 4, p is an integer of 1 to 8, q is an integer of 1 to 4, r is an integer of 1 or 2, s is an integer of 1 to 4, t is an integer of 1 or 2, u is an integer of 1 to 4, v is an integer of 1 or 2, and w is an integer of 1 to 4,
• wherein R7 is a straight-chain alkyl group having 6 to 20 carbon atoms or a straight-chain fluoroalkyl group having 6 to 20 carbon atoms.