Patent ID: 7074344

Claim:
A liquid crystal aligning agent comprising a polymer which comprises at least one recurring unit (A) having an optically crosslinkable structure and at least one recurring unit (B) having at least one group selected from the group consisting of a fluorine-containing organic group, an alkyl group having 10 to 30 carbon atoms, and an alicyclic organic group having 10 to 30 carbon atoms, wherein the optically crosslinkable structure is at least one structure selected from the group consisting of structures represented by the following formulae (I), (II), (III) and (IV): â€”P 1 â€”CR 1 â•CR 2 â€”CO-Q 1 -â€ƒâ€ƒ(I) P 3 â€”CR 5 â•CR 6 â€”CO-Q 3 -â€ƒâ€ƒ(III) â€”P 4 â€”CR 7 â•CR 8 â€”CO-Q 4 (IV) wherein P 1 and P 4 , independently of each other, are a divalent organic group comprising an aromatic ring, P 2 , P 3 and Q 4 , independently of each other, are a monovalent organic group comprising an aromatic ring, Q 2 is a trivalent organic group comprising an aromatic ring selected from the group consisting of benzene, biphenylene, naphthalene and anthracene, R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 , independently of each other, are a hydrogen atom or an alkyl group having 1â€“6 carbon atoms, and each of Q 1 and Q 3 independently is selected from the group consisting of a 1,2-phenylene group, a 1,3-phenylene group, a 1,4-phenylene group and a 4,4â€²-biphenylene group, wherein the amount of (A) recurring units is 10â€“90%, and the amount of (B) recurring units is 5 to 50% based on the total amount of all recurring units in said polymer.