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Adhesive composition, polarizing plate, and liquid crystal display

A composition, pressure-sensitive adhesive technology, applied in the direction of adhesive types, ester copolymer adhesives, adhesives, etc., can solve delayed resin and cross-linking agent reaction, large pressure-sensitive adhesive strength accumulation, decrease Removability and other issues to achieve the effect of suppressing light leakage, excellent workability and durability

Active Publication Date: 2011-05-25
杉金光电(广州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, according to the pressure-sensitive adhesive composition disclosed in the aforementioned document, the modulus of the pressure-sensitive adhesive increases sharply after ultraviolet irradiation for curing, delaying the reaction between the resin and the crosslinking agent, and thus requires Very long time to complete time-dependent changes in pressure-sensitive adhesive strength
And if the pressure-sensitive adhesive composition disclosed in the aforementioned document is adhered and heated before completing the curing reaction, a large pressure-sensitive adhesive strength build-up occurs, thereby significantly reducing removability

Method used

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  • Adhesive composition, polarizing plate, and liquid crystal display
  • Adhesive composition, polarizing plate, and liquid crystal display
  • Adhesive composition, polarizing plate, and liquid crystal display

Examples

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preparation example Construction

[0067]In the preparation of polarizers, the curing method of the pressure-sensitive adhesive composition according to the present invention is not particularly limited, for example, suitable heat or radiation capable of causing photoinitiation can be used to activate the thermal initiator contained in the composition. UV or electron beams activated by an agent are used for curing. In the present invention, the pressure-sensitive adhesive layer can be formed by using heat curing and radiation curing simultaneously.

[0068] In the present invention, if ray irradiation such as ultraviolet rays is used, ultraviolet irradiation can be performed by using, for example, a high-pressure mercury lamp, an induction lamp, or a xenon lamp. The radiation dose in ultraviolet curing is not particularly limited as long as it does not substantially impair physical properties and can sufficiently complete curing. For example, preferably its illumination intensity is 50-1,000mW / cm 2 and a radi...

Embodiment 1

[0080] Preparation of Acrylic Copolymer

[0081] 99 parts by weight of n-butyl acrylate (n-BA) and 0.1 part by weight of hydroxybutyl acrylate (HBA) were added to a 1 L reactor under nitrogen reflux and equipped with a cooling system for easy temperature control. Next, 120 parts by weight of ethyl acetate (EAc) was added as a solvent, and purged with nitrogen for 60 minutes to remove oxygen. Then the reactor was kept at 60°C, and 0.03 parts by weight of azobisisobutyronitrile (AIBN) was added as a reaction initiator, followed by a reaction for 8 hours, thereby preparing w / M n Acrylic resin for 3.4.

[0082] Preparation of pressure sensitive adhesive composition

[0083] With respect to 100 parts by weight of the prepared acrylic resin, by mixing 15 parts by weight of tris(acryloyloxyethyl) isocyanate (molecular weight: 423, trifunctional group, aronix M-315), 1.5 parts by weight as a photopolymerization initiator 1-hydroxycyclohexyl phenyl ketone, 1.5 parts by weight ...

Embodiment 2

[0089] A pressure-sensitive adhesive composition was prepared in the same manner as in Example 1, except that 1.5 parts by weight of 1,6-hexanediol was added instead of 1,4-butanediol as a pressure-sensitive adhesive strength stabilizer.

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Abstract

The present invention relates to a pressure sensitive adhesive composition which forms an interpenetrating polymer network structure when cured, and which contains an pressure sensitive adhesion stabilizer, and to a polarizing plate and a liquid crystal display. As the present invention employs an adhesion stabilizer with a functionality capable of quickly reacting to a multi-functional cross-linking agent, ageing of adhesion after preparation of the adhesive composition quickly ends, thus making it possible to quickly stabilize the adhesion, to improve re-peelability under room temperature or heating conditions, maintain an excellent durability and reliability, an excellent workability, and reduce light leakage characteristics under high-temperature and / or high-humidity conditions.

Description

technical field [0001] The invention relates to a pressure-sensitive adhesive composition, a polarizer and a liquid crystal display thereof. Background technique [0002] A liquid crystal display (LCD) is a device that displays images by injecting liquid crystals between two thin glass substrates. In order to make an LCD, a liquid crystal cell comprising liquid crystals interposed between substrates with transparent electrodes and a polarizer are basically required; suitable adhesives or pressure sensitive adhesives for bonding them must also be used . [0003] The polarizing plate contains an iodine compound or a dichroic polarizing material oriented in a certain direction, and has triacetyl cellulose (TAC) protective films formed on both sides of the polarizing film or device for protection thereof. multi-layer structure. The various films constituting the multilayer structure are made of materials with different molecular structures and compositions, and thus have diff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/08B32B23/20G02B1/04
CPCC09J133/062C09J133/066C09J133/08C08L2312/00C09K2323/035Y10T428/2891G02B5/30
Inventor 张基硕朴敏洙韩仁天
Owner 杉金光电(广州)有限公司