Liquid crystal aligning agent composition, method for preparing liquid crystal alignment film using same, and liquid crystal alignment film using same

Patent metadata

Field	Value
Publication number	US-11209699-B2
Application number	US-201816480730-A
Country	US
Kind code	B2
Filing date	Aug 9, 2018
Priority date	Sep 8, 2017
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

A liquid crystal aligning agent composition for forming a liquid crystal alignment film that can exhibit excellent alignment and electrical characteristics and simultaneously having enhanced durability, a method for preparing a liquid crystal alignment film using the liquid crystal aligning agent composition, and a liquid crystal alignment film comprising an aligned and cured product of the liquid crystal aligning agent composition and a liquid crystal display device comprising the liquid crystal alignment film.

First claim

The invention claimed is:

1. A liquid crystal aligning agent composition comprising:
a co-polymer including a first repeating unit including a repeating unit represented by Chemical Formula 1 or a repeating unit represented by Chemical Formula 2; and
a second repeating unit including a repeating unit represented by Chemical Formula 3:

wherein, in Chemical Formulas 1 to 3,
at least one of R 1 and R 2 is an alkyl group having 1 to 10 carbon atoms and the other is hydrogen,
at least one of R 3 and R 4 is a substituted or unsubstituted silyl group including a trimethylsilyl group and the other is hydrogen,
X 1 to X 3 are each a tetravalent organic group represented by Chemical Formula 4,
[Chemical Formula 4]

wherein, in Chemical Formula 4,
R 5 to R 10 are each independently hydrogen or an alkyl group having 1 to 6 carbon atoms,
L 1 is any one selected from the group of a single bond, —O—, —CO—, —COO—, —S—, —SO—, —SO 2 —, —CR 11 R 12 —, —(CH 2 ) Z —, —O(CH 2 ) Z O—, —COO(CH 2 ) Z OCO—, —CONH—, phenylene, and a combination thereof,
where R 11 and R 12 are each independently hydrogen, an alkyl group having 1 to 10 carbon atoms, or a fluoroalkyl group,
Z is an integer of 1 to 10, and
Y 1 to Y 3 are each independently a divalent organic group represented by Chemical Formula 5,

wherein, in Chemical Formula 5,
at least one of Q 1 to Q 4 is nitrogen and the rest are carbon, and
R 13 is hydrogen or an alkyl group having 1 to 6 carbon atoms.

2. The liquid crystal aligning agent composition of claim 1 , wherein the second repeating unit is contained in an amount of 0.1 mol % to 50 mol % based on the mole number of the total repeating units.

3. The liquid crystal aligning agent composition of claim 1 , wherein in Q 1 to Q 4 of Chemical Formula 5, one of Q 2 and Q 4 is nitrogen and the other is carbon, and Q 1 and Q 3 are carbon.

4. The liquid crystal aligning agent composition of claim 1 , wherein in Q 1 to Q 4 of Chemical Formula 5, Q 2 is nitrogen and Q 1 , Q 3 , and Q 4 are carbon.

5. The liquid crystal aligning agent composition of claim 1 , wherein in Chemical Formula 5, R 13 is hydrogen.

6. The liquid crystal aligning agent composition of claim 1 , wherein Chemical Formula 5 includes functional groups represented by the following Chemical Formulae 5-1 to 5-3:

wherein, in Chemical Formulae 5-1 to 5-3, Q 1 to Q 4 and R 13 are as defined in claim 1 .

7. A method for preparing a liquid crystal alignment film comprising the steps of:
coating a solution of the liquid crystal aligning agent composition of claim 1 onto a substrate to form a coating film;
drying the coating film;
irradiating the coating film with light immediately after the drying step or rubbing the coating film to perform an alignment treatment; and
heat-treating and curing the alignment-treated coating film.

8. The method for preparing a liquid crystal alignment film of claim 7 , wherein the liquid crystal aligning agent composition is dissolved or dispersed in an organic solvent to form the solution.

9. The method for preparing a liquid crystal alignment film of claim 7 , wherein the step of drying the coating film is performed at a temperature of 50° C. to 150° C.

10. The method for preparing a liquid crystal alignment film of claim 7 , wherein the light in the alignment treatment step is polarized ultraviolet rays having a wavelength of 150 nm to 450 nm.

11. The method for preparing a liquid crystal alignment film of claim 7 , wherein in the step of curing the coating film, the heat-treating of the alignment-treated coating film is performed at a treatment of 150° C. to 300° C.

12. A liquid crystal alignment film comprising an aligned cured product of the liquid crystal aligning agent composition of claim 1 .

13. A liquid crystal display device comprising the liquid crystal alignment film of claim 12 .

Assignees

• Lg Chemical Ltd

Inventors

• Kim Seongku
• Han Hee
• Jo Jung Ho
• Min Sung Joon
• Kwon Soon Ho
• Yoon Jun Young
• Yun Hyeong Seuk
• Park Hoonseo

Classifications

• C08G73/1085

  Polyimides with diamino moieties or tetracarboxylic segments containing heterocyclic moieties · CPC title

• G02F1/133723 Primary

  Polyimide, polyamide-imide · CPC title

• C08G73/1067

  Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound · CPC title

• C09K2323/027

  Polyimide · CPC title

• C08G73/106

  containing silicon · CPC title