	US 7,524,541 B2
	Material for liquid crystal aligning and liquid crystal displays made by using the same
Kimiaki Tsutsui, Funabashi (Japan); Takahiro Sakai, Funabashi (Japan); and Kohei Goto, Funabashi (Japan)
Assigned to Nissan Chemical Industries, Ltd., Tokyo (Japan)
Appl. No. 10/525,800 PCT Filed Aug. 28, 2003, PCT No. PCT/JP03/10967 § 371(c)(1), (2), (4) Date Aug. 23, 2005, PCT Pub. No. WO2004/021076, PCT Pub. Date Mar. 11, 2004.
Claims priority of application No. 2002-250212 (JP), filed on Aug. 29, 2002.
Prior Publication US 2006/0051525 A1, Mar. 09, 2006
Int. Cl. G02F 1/1337 (2006.01); C08L 79/06 (2006.01)

U.S. Cl. 428—1.26 [349/56; 428/1.2; 428/473.5; 528/350; 528/353]

15 Claims

1. A liquid crystal aligning agent comprising at least one selected from the group consisting of

a polyamic acid obtained by reactive polymerization of a tetracarboxylic dianhydride component with a diamine component, and

a polyimide obtained by cyclodehydration of the polyamic acid;

wherein from 20 to 100 mol % of the tetracarboxylic dianhydride component is at least one tetracarboxylic dianhydride selected from the group consisting of

1,2,3,4-cyclobutanetetracarboxylic dianhydride,

2,3,5-tricarboxycyclopentylacetic dianhydride,

3,4-dicarboxy-1,2,3,4-tetrahydro-1-naphthalenesuccinic dianhydride,

bicyclo[3 3,0]octane-2,4,6,8-tetracarboxylic dianhydride and

1,2,3,4-butanetetracarboxylic dianhydride;

wherein from 10 to 100 mol % of the diamine component is a diamine represented by the following formula (1):

wherein two among R¹to R¹⁰are primary amino groups, and the rest are hydrogen atoms or monovalent organic groups other than primary amino groups, provided that they may be the same or different from one another.