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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: 2016-05-18
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. Modulation of Polymer (A)

[0128] Into a reaction vessel with a stirrer, a thermometer, a reflux cooler, a dropping device, and a nitrogen introduction pipe, 99.0 parts by mass of n-butyl acrylate, 1.0 parts by mass of 2-hydroxyethyl acrylate, 200 parts by mass of ethyl acetate and 2 , 0.08 parts by mass of 2′-azobisisobutyrocyanide, and the air in the reaction vessel was replaced with nitrogen. The temperature of the reaction solution was raised to 60° C. while stirring under the nitrogen atmosphere, and the reaction was performed for 16 hours, and then cooled to room temperature. Here, a part of the obtained solution was subjected to molecular weight measurement by the following method, and production of a polymer (A) with a weight average molecular weight of 1.57 million was confirmed.

[0129] 2. Modulation of polymer (B)

[0130] Into a reaction vessel with a stirrer, a thermometer, a reflux cooler, a dropping device, and a nitrogen introduction pipe, 81.4 pa...

Embodiment 2-11

[0151] (embodiment 2-11, comparative example 1-3)

[0152] Except that the types and proportions of the constituent monomers of the adhesive composition, the types and compounding amounts of the crosslinking agent and silane coupling agent, and the compounding ratio of polymer (A) and polymer (B) were 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 polystyrene-equivalent weight average molecular weight measured by gel permeation chromatography (GPC) under the following conditions (GPC measurement).

[0154]

[0155] ・GPC measurement device: HLC-8020, manufactured by TOSOH

[0156] · GPC column (passed in the following order): manufactured by TOSOH

[0157] TSKguardco1umNHXL-H

[0158] TSKgelGMHXL (×2)

[0159] TSKge1G2000HXL

[0160] ·Measurement solvent: tetrahydrofuran

[0161] ·Measurement temper...

experiment example 1

[0162] [Experimental example 1] (Light leakage test)

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

[0164]

[0165] The sample was placed ...

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Abstract

To provide an adhesive composition, an adhesive, and an adhesive sheet which, when applied to optical components such as polarizing plates, have an excellent stress relaxation rate, prevent light leakage, have excellent durability, and are also excellent in reusability. The adhesive composition of the present invention contains the first (meth)acrylate polymer (A) having a weight average molecular weight of 500,000 to 3 million, and the second (meth)acrylate polymer (A) having a weight average molecular weight of 8,000 to 300,000. substance (B) and crosslinking agent (C). The first (meth)acrylate polymer (A) does not contain an acidic group substantially, and as a constituent monomer unit of the polymer, it contains a crosslinking agent (C) that satisfies the following formula (I) ) of the hydroxyl-containing monomer (a). The second (meth)acrylate polymer (B) does not substantially contain an acidic group, and contains, as a constituent monomer unit of the polymer, a compound whose reactivity with the crosslinking agent (C) satisfies the following formula (I): The hydroxyl group-containing monomer (b) is contained. Reactivity with crosslinking agent (C): 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 the adhesive composition) and an adhesive sheet, especially an adhesive composition, an adhesive and an adhesive sheet good for optical components such as polarizers . Background technique [0002] Generally, in a liquid crystal panel, when a polarizing plate and a phase difference plate are adhered to the glass substrate of a liquid crystal cell, the adhesive layer formed from an adhesive composition is used in many cases. However, optical components such as polarizers and retardation plates are prone to contraction when they are exposed to heat or the like, that is, they shrink due to thermal changes. As a result, the adhesive layer on which the optical components are laminated cannot follow the contraction As a result, peeling occurs at the interface (so-called lifting, peeling), and the optical axis of the optical member deviates due to stres...

Claims

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Application Information

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Patent Type & Authority Patents(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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