Liquid crystal alignment agent, liquid crystal alignment film using the same, and liquid crystal display device including the liquid crystal alignment film

• US 8,969,486 B2
• Filed: 08/22/2012
• Issued: 03/03/2015
• Est. Priority Date: 12/19/2011
• Status: Active Grant

• Current Assignee: Cheil Industries Incorporated
• Original Assignee: Cheil Industries Incorporated
• Inventors: Yang, Jae-Deuk, Yoo, Yong-Sik, Jo, Guk-Pyo
• Primary Examiner(s): Woodward, Ana
• Application Number:
  US13/591,614
• Publication Number:
  US 20130158208A1
• Time in Patent Office: 923 Days
• Field of Search: 525/420, 525/432, 525/436, 528/350, 528/353, 428/1.26, 428/473.5, 428/474.4, 252/299.4, 349/123, 349/127
• US Class Current: 525/432
• CPC Class Codes: C08G 73/16 Polyester-imides
• CPC Class Codes: C09K 2323/027 Polyimide
• CPC Class Codes: G02F 1/133788 by light irradiation, e.g. linearly polarised light photo-polymerisation
• CPC Class Codes: Y10T 428/31721 Of polyimide
• CPC Class Codes: Y10T 428/31725 Of polyamide

Abstract

Disclosed are a liquid crystal alignment agent, a liquid crystal alignment film manufactured using the same, and a liquid crystal display including the liquid crystal alignment film. The liquid crystal alignment agent includes a polymer comprising a polyamic acid including a repeating unit represented by Chemical Formula 1, polyimide including a repeating unit represented by Chemical Formula 2, or a combination thereof:

• • wherein Y¹ and Y² are each independently a divalent organic group derived from diamine, wherein the diamine includes photodiamine represented by Chemical Formula 3 and functional diamine represented by Chemical Formula 5:

• • and wherein the other substituents are the same as defined in the detailed description.

Claims

1. A liquid crystal alignment agent, comprising:

a polymer, wherein the polymer includes;

polyamic acid including a repeating unit represented by the following Chemical Formula 1,

polyimide including a repeating unit represented by the following Chemical Formula 2, or

a combination of the polyamic acid including a repeating unit represented by the following Chemical Formula 1 and the polyimide including a repeating unit represented by the following Chemical Formula 2;

2. The liquid crystal alignment agent of claim 1, wherein the photodiamine comprises a compound represented by the following Chemical Formula 4:

3. The liquid crystal alignment agent of claim 1, wherein the diamine of Chemical Formula 5 comprises a compound represented by the following Chemical Formula 6:

4. The liquid crystal alignment agent of claim 1, wherein the diamine comprises about 50 to about 95 mol % of the photodiamine and about 5 to about 50 mol % of the diamine of Chemical Formula 5.

5. The liquid crystal alignment agent of claim 1, wherein each of the polyamic acid and the polyimide has a weight average molecular weight of about 10,000 to about 300,000 g/mol.

6. The liquid crystal alignment agent of claim 1, wherein the polyamic acid and the polyimide are included in a weight ratio of about 1:

99 to about 50;

50 when the polymer comprises the polyamic acid and the polyimide.

7. The liquid crystal alignment agent of claim 1, wherein the liquid crystal alignment agent has a solid content of about 0.1 to about 30 wt %.

8. A liquid crystal alignment agent, comprising:

a polymer, wherein the polymer includes;

polyamic acid including a repeating unit represented by the following Chemical Formula 1,

polyimide including a repeating unit represented by the following Chemical Formula 2, or

a combination of the polyamic acid including a repeating unit represented by the following Chemical Formula 1 and the polyimide including a repeating unit represented by the following Chemical Formula 2;