摘要:
A vertical type liquid crystal aligning agent is provided to ensure excellent voltage maintenance characteristics in a vertical type liquid crystal device while exhibiting good coatability on a substrate. A vertical type liquid crystal aligning agent comprises a polymer having at least one of amic acid repeating units represented by the following formula 1a and imide repeating units represented by the following formula 2, wherein Q1 in formula 1a and Q2 in formula 1b contains at least one divalent organic group represented by the following formulae 2a and 2b, and at least one divalent organic group represented by the formula of -X2-3-X2. In formulae 1a and 1b, each of P1 and P2 represents a tetravalent organic group forming a tetracarboxylic acid, and each of Q1 and Q2 represents a divalent organic group forming a diamine. In formulae 2a and 2b, X1 is a single bond, -O-, -CO-, -COO-, -OCO-, -NHCO-, -CONH-, -S-, methylene, C2-C6 alkylene or phenylene; R1 is a C10-20 alkyl, C4-C40 alicyclic monovalent organic group or C6-C20 fluorine-containing monovalent organic group; and R2 is a C4-C40 alicyclic divalent organic group or C5-C30 fluorine-containing divalent organic group. In the formula of -X2-3-X2, X2 independently represents methylene or a C2-C20 alkylene; and R3 is an aromatic ring-containing backbone, organosiloxane backbone, divalent organic group represented by the formula of -R-(O-C2H4)n-O-R- (wherein R is a C2-C5 alkylene and n is 1-100), a divalent organic group represented by the formula of -R-(O-C2H4)n-O-R- (wherein R is a C2-C5 alkylene, and n is 1-50), C4-C40 alicyclic ring backbone-containing divalent organic group.
摘要:
Provided are a vertical alignment liquid crystal aligning agent which has a volume intrinsic resistance of 1x10^13 Ф.cm or less after sintering at a high temperature, and a vertical alignment liquid crystal display device containing the liquid crystal aligning agent. The vertical alignment liquid crystal aligning agent comprises a poly(amide acid) polymer and/or a polyimide having a volume intrinsic resistance of a film of 1x10^12 Ф.cm after sintering at a high temperature. Preferably the vertical alignment liquid crystal aligning agent contains a divalent organic group of 8 mol% or more derived from a diamine represented by a formula I-1 or I-2 to the total divalent organic group, wherein X is a single bond, -O-, -CO-, -COO-, -OCO-, -NHCO-, -CONH-, -S-, a methylene group, a C2-C6 alkylene group, or a phenylene group; A1 is a divalent organic group having a C10-C20 alkyl group or a C4-C40 alicyclic structure, or a C6-C20 divalent organic group having a fluorine atom; and A2 is a monovalent organic group having a C4-C40 alicyclic structure.