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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, acid copolymer adhesive, etc., can solve the problem of difficult stress relaxation rate, etc., and achieve excellent stress relaxation rate, Appropriate cohesion and sufficient anti-static effect

Active Publication Date: 2013-01-23
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it becomes more difficult to assign the stress relaxation rate

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

[0147] 1. Modulation of Polymer (A)

[0148] Into a reaction vessel with a stirrer, a thermometer, a reflux cooler, a dropping device, and a nitrogen introduction pipe, add 75.0 parts by mass of n-butyl acrylate, 20.0 parts by mass of 2-methoxyethyl acrylate, 5.0 parts by mass of acrylic acid, acetic acid 200 parts by mass of ethyl ester and 0.08 parts by mass of 2,2'-azobisisobutylcyanide, and the air in the reaction container was replaced with nitrogen. Stirring was carried out under this nitrogen atmosphere, and the temperature of the reaction solution was raised to 60° C., and after reacting for 16 hours, it was cooled to room temperature. Here, a part of the obtained solution was measured for molecular weight by the following method, and it was confirmed that the polymer (A) having a weight average molecular weight of 1.2 million was produced.

[0149] 2. Modulation of polymer (B)

[0150] Into a reaction vessel with a stirrer, a thermometer, a reflux cooler, a dropping...

Embodiment 2-26

[0177] [Example 2-26, Comparative Example 1-3]

[0178] The type and ratio of each monomer constituting the adhesive composition, the type and compounding amount of the crosslinking agent, antistatic agent, and silane coupling agent, and the compounding ratio of polymer (A) and polymer (B) are shown in Table 1 Except for such a change, it carried out similarly to Example 1, and manufactured the polarizing plate with an adhesive agent layer.

[0179] 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).

[0180]

[0181] ・GPC measurement device: HLC-8020, manufactured by Tosoh Co., Ltd.

[0182] · GPC column (passed in the following order): manufactured by Tosoh Corporation

[0183] TSK guard column N HXL-H

[0184] TSK gel GMHXL (×2)

[0185] TSK gel G2000HXL

[0186] ·Measurement solvent: tetrahydrofura...

experiment example 1

[0188] [Experimental Example 1] (Measurement of Gel Fraction)

[0189] In the examples or comparative examples, the polarizing plate used in the production of the polarizing plate with an adhesive layer is replaced, and one side of the polyethylene terephthalate film is used. A peeling sheet (manufactured by Lintec Corporation, SP-PET3801, thickness: 38 μm) subjected to peeling treatment was used to prepare an adhesive sheet. Specifically, on the exposed adhesive layer of the structure composed of the release sheet / adhesive layer (thickness: 25 μm) obtained in the manufacturing process of the example or the comparative example, the release sheet was stacked so that The adhesive layer is in contact with the release-treated surface side. In this way, an adhesive sheet having a configuration of release sheet / adhesive layer / release sheet was produced.

[0190] The obtained adhesive sheet was aged at 23° C. and 50% RH for 7 days. Thereafter, the adhesive sheet was made into a ...

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Abstract

An adhesive composition, an adhesive and an adhesive sheet which are suitable for optical components, such as polarization light panel, etc., and have anti-charge property, good stress relaxation rate and good durability are provided. The adhesive composition contains first (methyl) acrylic ester polymers (A) having a Mw of 500-3000 thousands, second (methyl) acrylic ester polymers (B) having a Mw of 80000-300 thousands, a cross-linking agent (C) and an anti-charge agent (D). The ratio of the second (methyl) acrylic ester polymers (B) with respect to 100 parts by mass of the first (methyl) acrylic ester polymers (A) is 5 to 50 parts by mass. The (B) contain monomers having functional groups (b1) reacting with the (C), and the ratio of the monomers in the (B) is more than 1 mass% and less than 50 mass%. The (A) do not contain monomers having functional groups reacting with the (C) or contain monomers having functional groups (a1) having reactiveness with the (C) lower than that of the functional groups (b1) of the (B).

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, and in particular to an adhesive composition, an adhesive, and an adhesive suitable for optical components such as polarizing plates. piece. Background technique [0002] In general, in a liquid crystal panel, when a polarizing plate and a retardation plate are bonded to a glass substrate of a liquid crystal cell, etc., an adhesive layer formed of an adhesive composition is often used. However, optical components such as polarizers and retardation plates tend to shrink due to heat, etc., and the shrinkage caused by the thermal change occurs, and as a result, the adhesive layer laminated on the optical components cannot The shrinkage follows, and peeling occurs at the interface (so-called lifting, peeling), and the stress at the time of shrinkage of the optical member causes the optical axis of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/08C09J133/14C09J133/02C09J11/06C09J7/02
CPCC09J7/22C09J7/385C09J7/403C09J133/04C09J175/04C09J2203/318C09J2301/302C09J2301/312C09J2301/408G02B5/005
Inventor 又野仁荒井隆行小泽祐树所司悟
Owner LINTEC CORP
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