Patent ID: 8545946

Claim:
A liquid crystal alignment solution, comprising at least one polymer selected from the group consisting of a polyamide acid-polyamide acid polymer represented by formula (A), a polyimide-polyamide acid polymer represented by formula (B) and a polyimide-polyimide polymer represented by formula (C), wherein T 1 and T 2 are each independently a tetravalent organic group; m<n; p<q; r<s; D 1 and D 2 are selected from the group consisting of formula (3)-(6) as a first group and formulae (9)-(11) and (15) as a second group, wherein D 1 and D 2 are selected from different groups, in the formulae (3) and (4), R 1 , R 2 , R 3 , and R 4 are each independently a monovalent organic group, a halogen atom or a hydrogen atom; X is —O—, —SO— or —SO 2 —; Y is a divalent organic group, and Y is diphenyl when X is —O—; a and b are each independently an integer from 0 to 4; and c and d are each independently an integer from 0 to 3; in the formulae (5) and (6), R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are each independently a monovalent organic group, a halogen atom or a hydrogen atom; X is —O—, —S—, —SO—, —SO 2 — or —CO—; Z is a divalent organic group, —O—, —S—, —SO—, —SO 2 — or —CO—, and Z is benzene ring when X is —O—, Z is not —S— when X is —S—; a, b, e and f are each independently an integer from 0 to 4; and c and d are each independently an integer from 0 to 3; in the formulae (9)-(11) and (15), R 7 is a monovalent C 4-40 alicyclic group or a monovalent C 8-20 aliphatic group; R 8 , R 11 , R 12 , R 13 , R 14 and R 15 are each independently a halogen atom or a monovalent organic group; R 9 is a divalent C 4-40 alicyclic group; X′ and Y′ are each independently a divalent group selected from the group consisting of —O—, —NH—, —S—, —CO—, —COO—, —NHCO— and —CONH—; A is a divalent group selected from the group consisting of —O—, —NH—, —S—, —CO—, —COO—, —OCO—, —NHCO— and —CONH—; and a′ and b′ are each independently an integer larger than or equal to 1.