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Adhesive composition, adhesive and adhesive sheet

A technology of composition and adhesion, applied in the direction of adhesive type, ester copolymer adhesive, polyurea/polyurethane adhesive, etc., can solve insufficient reusability, insufficient stress relaxation rate, adhesion Eliminate problems such as increased strength, and achieve the effects of good reusability, excellent durability, and excellent cohesion

Active Publication Date: 2013-04-24
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the durability of the adhesive is poor, for example, under hot and humid conditions, the adhesive interface will peel off
In addition, the stress relaxation rate is not sufficient, and when it is applied to optical components such as polarizers, light leakage may occur.
Furthermore, the adhesion tends to increase over time after attachment, and the reusability is not sufficient

Method used

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  • Adhesive composition, adhesive and adhesive sheet
  • Adhesive composition, adhesive and adhesive sheet
  • Adhesive composition, adhesive and adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0127] 1. Preparation of polymer (A)

[0128] Into a reaction vessel equipped with a stirrer, a thermometer, a reflux cooler, a dropping device, and a nitrogen introduction tube, 99.0 parts by mass of n-butyl acrylate, 1.0 part by mass of 2-hydroxyethyl acrylate, 200 parts by mass of ethyl acetate, and 2 parts were added. , 0.08 parts by mass of 2'-azobisisobutyronitrile, and replace the air in the reaction vessel with nitrogen. While stirring in this nitrogen atmosphere, the reaction solution was heated up to 60°C, and after the reaction was performed for 16 hours, it was cooled to room temperature. Here, a part of the obtained solution was subjected to molecular weight measurement by the following method, and the production of polymer (A) with a weight average molecular weight of 1.57 million was confirmed.

[0129] 2. Preparation of polymer (B)

[0130] Into a reaction vessel equipped with a stirrer, a thermometer, a reflux cooler, a dropping device, and a nitrogen introduction ...

Embodiment 2-11

[0151] (Example 2-11, Comparative Example 1-3)

[0152] Except that the types and ratios of the monomers of the adhesive composition, the types and blending amounts of crosslinking agent and silane coupling agent, and the blending ratio of polymer (A) and polymer (B) are changed as shown in Table 1. Except for the above, in the same manner as in Example 1, a polarizing plate having an adhesive layer was produced.

[0153] Here, the above-mentioned weight average molecular weight (Mw) is a weight average molecular weight in terms of polystyrene measured by gel permeation chromatography (GPC) under the following conditions (GPC measurement).

[0154]

[0155] ·GPC measuring device: made by TOSOH, HLC-8020

[0156] ·GPC column (pass in the following order): made by TOSOH

[0157] TSK guard co1umN HXL-H

[0158] TSK gel GMHXL(×2)

[0159] TSK ge1 G2000HXL

[0160] ·Measuring solvent: tetrahydrofuran

[0161] ·Measurement temperature: 40℃

experiment example 1

[0162] [Experiment example 1] (Light leakage experiment)

[0163] The polarizing plate with the adhesive layer obtained in the example or the comparative example was adjusted to a size of 233 mm×309 mm with a cutting device (Super Knife manufactured by Kono Seisakusho Co., Ltd., PN1-600). The peeling sheet is peeled off, and the exposed adhesive layer is attached to alkali-free glass (Corning, Eagle XG), and then pressurized in a kettle made by Kurihara Manufacturing Co., Ltd. at 0.5 MPa and 50°C for 20 minutes . In addition, in the bonding, the polarizing plate with the adhesive layer should be in a Nicol cross state (polarization axis: ∠45°, ∠135°). In this state, it was left in a dry environment at 80°C for 250 hours, and then left in an environment of 23°C and 50% RH for 2 hours. This was used as a sample and the light leakage was evaluated by the method shown below. The results are shown in Table 2.

[0164]

[0165] The sample was placed on a flat panel illuminator (manufa...

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Abstract

Provided are an adhesive composition, an adhesive and an adhesive sheet, which have the excellent stress relaxation rate, the excellent durability which preventing light leakage, and further the desirable reusability when being applied to optical parts such as the polarizer plate. The adhesive composition of the present invention contains (A) a first (meth) acrylate polymer with a weight average molecular weight of 500,000 to 3,000,000, (B) a second (meth) acrylate polymer with a weight average molecular weight of 8,000 to 300,000 and (C) the crosslinking agent. The first (meth) acrylate polymer (A) is substantially free from acid groups and contains, as the constituent monomer unit of the polymer, a hydroxyl monomer (a) with reactivity to the crosslinking agent (C) satisfying the formula (I). The second (meth) acrylate polymer (B) is substantially free from acid groups and contains, as the constituent monomer unit of the polymer, a hydroxyl-containing monomer (b) with reactivity to the crosslinking agent (C) satisfying the formula (I). The reactivity to the crosslinking agent (C) satisfies: hydroxyl-containing monomer (a) < hydroxyl-containing monomer (b) - (I).

Description

Technical field [0001] The present invention relates to an adhesive composition, an adhesive (a material obtained by crosslinking an adhesive composition) and an adhesive sheet, especially a good adhesive composition for optical parts such as a polarizer, an adhesive and an adhesive sheet . Background technique [0002] Generally, in a liquid crystal panel, an adhesive layer formed from an adhesive composition is often used when a polarizer and a retardation plate are adhered to the glass substrate of a liquid crystal cell. However, optical components such as polarizers and retardation plates tend to shrink when exposed to heat or the like, that is, shrink due to thermal changes. As a result, the adhesive layer stacked on the optical components cannot follow the shrinkage. As a result, peeling (so-called floating, peeling) occurs at the interface, and the optical axis of the optical component is shifted due to the stress during the contraction of the optical component, and light...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/08C09J133/14C09J11/06C09J7/02
CPCC09J7/22C09J7/385C09J133/04C09J175/04C09J2203/318C09J2301/302
Inventor 黑川敦史又野仁荒井隆行所司悟
Owner LINTEC CORP
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