SEALANT COMPOSITION, METHOD FOR PREVENTING LIQUID CRYSTAL CONTAMINATION, LIQUID CRYSTAL PANEL AND DISPLAY DEVICE

• US 20140065325A1
• Filed: 12/21/2012
• Published: 03/06/2014
• Est. Priority Date: 03/21/2012
• Status: Active Grant

• Current Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.)
• Original Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.)
• Inventors: Guo, Renwei, Chen, Dong
• Granted Patent: US 9,644,109 B2
• Time in Patent Office: Days
• US Class Current: 428/1.55
• CPC Class Codes: B32B 2457/202 LCD, i.e. liquid crystal displays
• CPC Class Codes: C08F 220/1802 C2-(meth)acrylate, e.g. ethyl (meth)acrylate
• CPC Class Codes: C08F 220/1803 C3-(meth)acrylate, e.g. (iso)propyl (meth)acrylate
• CPC Class Codes: C08F 220/1804 C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
• CPC Class Codes: C08F 222/102 of dialcohols, e.g. ethylene glycol di(meth)acrylate or 1,4-butanediol dimethacrylate
• CPC Class Codes: C09D 133/14 of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen
• CPC Class Codes: C09J 133/062 Copolymers with monomers not covered by C09J133/06
• CPC Class Codes: C09J 4/06 Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
• CPC Class Codes: C09K 2003/1062 UV-curable materials
• CPC Class Codes: C09K 2200/0625 Polyacrylic esters or derivatives thereof
• CPC Class Codes: C09K 2323/05 Bonding or intermediate layer characterised by chemical composition, e.g. sealant or spacer
• CPC Class Codes: C09K 2323/059 Unsaturated aliphatic polymer, e.g. vinyl
• 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 1/1339 Gaskets; Spacers; Sealing of cells

Abstract

Disclosed is a sealant composition, a liquid crystal device and a method for preventing liquid crystal contamination using the sealant composition. The sealant composition consists of 20-30 parts by weight of an ultraviolet polymerizable double bond monomer, 15-20 parts by weight of a heat polymerization monomer, 5-20 parts by weight of a polymerizable oligomer, 0.1-5 parts by weight of a photoinitiator, 10-20 parts by weight of a heat curing agent and 0-20 parts by weight of a particulate additive, wherein said polymerizable oligomer is poly(ethylene glycol) diacrylate or derivatives thereof. Through the reaction between the polymerizable oligomers and the polymer of the ultraviolet polymerizable double bond monomers to generate a reticular high molecular polymer, the anchoring effect of the polymer on the surrounding unreacted heat polymerization monomers is effectively enhanced, thereby reducing the contamination of the crystal liquid by the sealant.

Claims

1. A sealant composition comprising an ultraviolet polymerizable double bond monomer and a polymerizable oligomer, wherein said polymerizable oligomer is poly(ethylene glycol)diacrylate or derivatives thereof.

2. The sealant composition according to claim 1, wherein said ultraviolet polymerizable double bond monomer is an acrylate, preferably methyl acrylate, methyl methacrylate, ethyl acrylate, propyl acrylate or butyl acrylate.

12. A liquid crystal panel which employs the sealant composition according to claim 1 for sealing.

13. A display device which comprises the liquid crystal panel according to claim 12.

14. Use of the sealant composition according to claim 1 for preventing liquid crystal contamination.

3. A sealant composition comprising or consisting of the following components:

an ultraviolet polymerizable double bond monomer, 20-30 parts by weight;

a heat polymerization monomer, 15-20 parts by weight;

a polymerizable oligomer, 5-20 parts by weight;

a photoinitiator, 0.1-5 parts by weight;

a heat curing agent, 10-20 parts by weight; and

a particulate additive, 0-20 parts by weight;

wherein said polymerizable oligomer is poly(ethylene glycol) diacrylate or derivatives thereof.

4. The sealant composition according to claim 3, wherein said poly(ethylene glycol) diacrylate or derivatives thereof has a weight-average molecular weight of 200-3000.

5. The sealant composition according to claim 4, wherein said poly(ethylene glycol)diacrylate or derivatives thereof has a weight-average molecular weight of 200-1000.

6. The sealant composition according to claim 3, wherein said ultraviolet polymerizable double bond monomer is an acrylate, preferably methyl acrylate, methyl methacrylate, ethyl acrylate, propyl acrylate or butyl acrylate;

said heat polymerization monomer is heat polymerizable monomer with epoxy group;

said photoinitiator is dibenzoyl peroxide, lauroyl peroxide, azobisisobutyronitrile, azobisisoheptonitrile, diisopropyl peroxydicarbonate or dicyclohexyl peroxydicarbonate ;

said heat curing agent is amino curing agent; and

said particulate additive is a silicon dioxide particle.

7. The sealant composition according to claim 6, wherein said heat polymerizable monomer with epoxy group is ethylene glycol diglycidyl ether;

and

said amino curing agent is 1,8-diamino-3,6-dioxaoctane.

8. A method for preventing liquid crystal contamination using a sealant composition comprising the steps of:

a) mixing the sealant composition according to claim 3 and subjecting it to defoaming under protection from light;

b) coating the mixture obtained in step a) onto a colored film substrate and/or a array substrate, and then filling the colored film substrate and the array substrate with the liquid crystal and aligning them to obtain the liquid crystal display panel;

c) irradiating the liquid crystal display panel with ultraviolet light so that the polymerizable oligomer and the polymer of the ultraviolet polymerizable double bond monomer in the sealant are ultraviolet polymerized; and

d) heating the liquid crystal display panel obtained in step c) so that the heat polymerization monomer in the sealant is heat polymerized.

9. The method according to claim 8, wherein in the step a), the defoaming under protection from light lasts 1-5 hours.

10. The method according to claim 8, wherein in the step c), the wavelength of the ultraviolet light is 350-380 nm, the duration of the ultraviolet light irradiation is 1-60 mins, and the intensity of the ultraviolet light irradiation is 0.1-100 mW/cm².

11. The method according to claim 8, wherein in the step d), the temperature of the heat polymerization is 50-150°

C., and the reaction duration is 0.5-5 hours.