Black sealant for liquid crystal cell and liquid crystal cell

• US 6,120,858 A
• Filed: 07/28/1998
• Issued: 09/19/2000
• Est. Priority Date: 08/01/1997
• Status: Expired due to Fees

• Current Assignee: Nippon Kayaku Company Limited
• Original Assignee: Nippon Kayaku Company Limited
• Inventors: Ishii, Akira, Matsuyama, Shigeru, Hirano, Masahiro, Shinmoto, Masaki
• Primary Examiner(s): Dawson, Robert
• Assistant Examiner(s): AYLWARD, DAVID E
• Application Number:
  US09/123,713
• Time in Patent Office: 784 Days
• Field of Search: 523/440, 523/442, 523/458, 523/459, 428/1
• US Class Current: 428/1.53
• CPC Class Codes: C03C 17/007 containing a dispersed phase, e.g. particles, fibres or flakes, in a continuous phase
• CPC Class Codes: C03C 2217/445 Organic continuous phases
• CPC Class Codes: C03C 2217/475 Inorganic materials
• CPC Class Codes: C03C 2217/477 Titanium oxide
• CPC Class Codes: C03C 27/10 with the aid of adhesive specially adapted for that purpose
• CPC Class Codes: C09K 2200/0645 obtained otherwise than by reactions involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09K 2323/055 Epoxy
• CPC Class Codes: C09K 3/10 Materials in mouldable or extrudable form for sealing or packing joints or covers filling pastes C09D5/34
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/1339 Gaskets; Spacers; Sealing of cells

Abstract

Provided is a black sealant for liquid crystal cell comprising (a) an epoxy resin, (b) a novolac resin, (c) a curing accelerator and (d) a titanium-type black pigment. The use of the black sealant for liquid crystal cell of the present invention can provide a liquid crystal cell which prevents light leakage of the liquid crystal cell from the sealed portion, which has a high electrical insulation property and which is excellent in an adhesion strength and a humidity resistance.

Claims

1. A black sealant for liquid crystal cell comprising (a) an epoxy resin, (b) a novolac resin, (c) a curing accelerator and (d) a titanium black pigment.

2. The black sealant for liquid crystal cell recited in claim 1, wherein the particle diameter of the titanium black pigment (d) is 4 μ

m or less.

3. The black sealant for liquid crystal cell recited in claim 2, wherein the amount of the titanium black pigment is between 10 and 70% by weight based on the solid content except the organic solvent of the black sealant for liquid crystal cell.

4. The black sealant for liquid crystal cell recited in claims 3, wherein the volume resistivity of the cured film of the black sealant for liquid crystal cell is 10⁷ Ω

•

cm or more.

5. The black sealant for liquid crystal cell recited in claim 4, wherein the optical density (OD) of the cured film of the black sealant for liquid crystal cell is 2.0 or more with the film thickness of 7 μ

m or less.

6. The black sealant for liquid crystal cell recited in claim 5, which further comprises an organic pigment and/or an inorganic pigment.

12. A liquid crystal cell which is sealed with the sealant recited in any one of claims 1 to 11.

13. A liquid crystal display device having the liquid crystal cell of claim 12.

7. A black sealant for liquid crystal cell comprising (a) an epoxy resin, (b) a novolac resin, (c) a curing accelerator, (d) a titanium black pigment and (e) a spacer.

8. The black sealant for liquid crystal cell recited in claim 7, wherein the diameter of the spacer (e) is between 2 and 10 μ

m, and the particle diameter of the titanium black pigment (d) is less than the diameter of the spacer.

9. The black sealant for liquid crystal cell recited in claim 8, wherein the particle diameter of the titanium black pigment (d) is not more than half the diameter of the spacer.

10. The black sealant for liquid crystal cell recited in claim 9, wherein the amount of the titanium-type black pigment (d) is between 10 and 70% by weight based on the total amount of the epoxy resin (a), the novolac resin (b), the curing accelerator (c) and the titanium black pigment (d).

11. The black sealant for liquid crystal cell recited in any one of claim 10, wherein the amount of the spacer (e) is between 0.05 and 4 parts by weight per 100 parts by weight in total of the epoxy resin (a), the novolac resin (b), the curing accelerator (c) and the titanium black pigment (d).

14. A cured film obtained from components comprising, as essential components, (a) an epoxy resin, (b) a novolac resin, (c) a curing accelerator and (d) a titanium black pigment, and having a volume resistivity of 10⁷ Ω

•

cm or more.