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Sealing composition for liquid crystal displays and process for production of liquid crystal display panels

A technology of liquid crystal sealant and liquid crystal display panel, which is applied in the direction of chemical instruments and methods, instruments, optics, etc., can solve the problems that there is no description of the curing properties of the gap formation, and the reliability of the liquid crystal display panel cannot be said to be sufficient.

Inactive Publication Date: 2005-10-12
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sealant composition does not describe the gap-forming properties after photocuring and the curability of the light-shielding area of ​​the wiring part, and the reliability of the obtained liquid crystal display panel cannot be said to be sufficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0122] Hereinafter, the present invention will be described in detail using representative examples, but the present invention is not limited thereto. The % and parts stated in the examples refer to % by weight and parts by weight, respectively.

[0123]

[0124] (1) Solid epoxy resin with a softening point temperature of 40°C or higher measured by the ring and ball method

[0125] As the solid epoxy resin of the above-mentioned component (1), an o-cresol novolak-type solid epoxy resin (softening point measured by a dry ball method, a product of Nippon Kayakuyo Co., Ltd., trade name "EOCN-1020-75") was used The temperature was 75°C and the number average molecular weight determined by GPC was 1100).

[0126] As another epoxy resin, a bisphenol F-type liquid epoxy resin under the trade name "EPICLON 830S", a product of Dainippon Ink Chemical Co., Ltd., was used.

[0127] (2) Acrylate monomers and / or methacrylate monomers or their oligomers

[0128] As the acrylate monomer ...

Synthetic example 1

[0133] Synthesis of the thermoplastic polymer of the above component (3)

[0134] In a 1000 mL four-necked flask equipped with a stirrer, a nitrogen introduction tube, a thermometer and a reflux condenser, 400 g of ion-exchanged water and 1.0 g of sodium alkyl diphenyl ether disulfonate were added and the temperature was raised to 65°C. After adding 0.4 g of potassium persulfate, 1.2 g of tert-dodecyl mercaptan emulsified with a homogenizer, 156 g of n-butyl acrylate, 4.0 g of divinyl benzene, 3.0 g of alkyl group were continuously added dropwise over 4 hours. A mixed solution composed of sodium diphenyl ether disulfonate and 200 g of ion-exchanged water. After the reaction was continued for 2 hours after the dropwise addition, 232 g of methyl methacrylate was added at one time, and then the reaction was continued for 1 hour, and 8 g of acrylic acid was continuously added over a period of 1 hour. The reaction was continued for 2 hours at a constant temperature of 65°C, and th...

Synthetic example 2

[0136] Synthesis of other thermoplastic polymers

[0137] In a 1000 mL four-necked flask equipped with a stirrer, a nitrogen introduction tube, a thermometer and a reflux condenser, 400 g of ion-exchanged water and 1.0 g of sodium alkyl diphenyl ether disulfonate were added and the temperature was raised to 65°C. After adding 0.4 g of potassium persulfate, 1.2 g of tert-dodecyl mercaptan emulsified with a homogenizer, 156 g of n-butyl acrylate, 4.0 g of divinyl benzene, 3.0 g of alkyl group were continuously added dropwise over 4 hours. A mixed solution composed of sodium diphenyl ether disulfonate and 200 g of ion-exchanged water. After the reaction was continued for 2 hours after the dropwise addition, 142 g of methyl methacrylate and 90 g of n-butyl acrylate were added at one time, and then the reaction was continued for 1 hour. 8 g of acrylic acid was added continuously over a period of 1 hour, the reaction was continued for 2 hours at a constant temperature of 65° C., an...

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PUM

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Abstract

The sealing composition for liquid crystal displays according to the invention is characterized by consisting of a one-pack type photo- and thermo-setting resin composition comprising (1) a solid epoxy resin having a softening point of 40 DEG C or above as determined by ring and ball method, (2) an acrylate ester monomer and / or a methacrylate ester monomer or an oligomer thereof, (3) a thermoplastic polymer obtained by copolymerizing an acrylate ester monomer and / or a methacrylate ester monomer with a monomer copolymerizable therewith and having a softening point of 50 to 120 DEG C as determined by ring and ball method, (4) a photoradical polymerization initiator, and (5) a latent epoxy curing agent. The photo- and thermo-setting sealing composition for liquid crystal displays is applicable to the dispenser method, can give a cured product having excellent characteristics through photosetting in the first step, and permits the formation of stable cell gaps. Further, the sealing composition is inhibited from polluting liquid crystal in thermosetting in the second step and attains excellent setting properties in the shaded areas and high adhesion reliability.

Description

technical field [0001] The present invention relates to a liquid crystal sealing agent composition, and more specifically, to a liquid crystal sealing agent composition used in a liquid crystal dropping construction method, and a method for producing a liquid crystal display panel using the composition, and a liquid crystal display panel. Background technique [0002] In recent years, as display panels of various devices including cellular phones, liquid crystal display panels having lightweight and highly detailed features have been widely used. As a method for producing such a liquid crystal display panel, a method in which a thermosetting sealant composition mainly composed of epoxy resin is applied to a glass substrate for liquid crystal display, and after pre-curing treatment, is generally used. After bonding to a substrate, thermocompression bonding is performed to form a cell for liquid crystal encapsulation, liquid crystal is injected under vacuum, and after injectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/10C08G59/18G02F1/1339
CPCC08F283/10C08G59/18G02F1/1339
Inventor 宫脇孝久水田康司竹内文人伊藤健司北村正朝仓弘幸八城贤一永田桂
Owner MITSUI CHEM INC
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