Adhesive and adhesive sheet

An adhesive, adhesive sheet technology, applied in the directions of adhesives, adhesive types, ester copolymer adhesives, etc., can solve the problem of difficulty in assigning stress relaxation rate, and achieve sufficient charge resistance and large elongation at break. , excellent cohesion effect

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

AI Technical Summary

Problems solved by technology

As a result, it becomes more difficult to impart a stress relaxation rate

Method used

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  • Adhesive and adhesive sheet
  • Adhesive and adhesive sheet
  • Adhesive and adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0136] 1. Modulation of Polymer (A)

[0137] 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. The air in the reaction vessel was replaced with nitrogen. The temperature of the reaction solution was raised to 60° C. while stirring in 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 measured for molecular weight by the following method, and production of a polymer (A) having a weight average molecular weight of 1.2 million was confirmed.

[0138] 2. Modulation of polymer (B)

[0139] Into a reaction vessel with a stirrer, a thermometer, a reflux cooler, a dropping device, and a nitroge...

Embodiment 2-26

[0166] [Example 2-26, Comparative Example 1-3]

[0167] In addition to the type and proportion 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 the polymer (A) and the polymer (B) were carried out. Except the modification shown in Table 1, it carried out similarly to Example 1, and manufactured the polarizing plate which has an adhesive layer.

[0168] 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).

[0169]

[0170] ・GPC measurement device: HLC-8020, manufactured by TOSOH

[0171] · GPC column (passed in the following order): manufactured by TOSOH

[0172] TSK guard column N HXL-H

[0173] TSK gel GMHXL (×2)

[0174] TSK gel G2000HXL

[0175] ·Measurement solven...

experiment example 1

[0177] [Experimental Example 1] (Measurement of Gel Fraction)

[0178] In Examples or Comparative Examples, instead of the polarizing plate used in the production of the polarizing plate having an adhesive layer, the sheet surface using a polyethylene terephthalate film was removed with a silicone-based release agent. The peeling-processed release sheet (manufactured by Lintec Corporation, SP-PET3801, thickness: 38 μm) was used to prepare an adhesive sheet. Specifically, on the exposed adhesive layer of a structure composed of a release sheet / adhesive layer (thickness: 25 μm) obtained in the manufacturing process of the example or comparative example, the release sheet was stacked to make the release The treated surface side is in contact with the adhesive layer. In this way, an adhesive sheet comprising a release sheet / adhesive layer / release sheet was obtained.

[0179] The obtained adhesive sheet was aged for 7 days under the conditions of 23° C. and 50% RH. Thereafter,...

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Abstract

An adhesive and an adhesive sheet which are suitable for optical components, such as polarization light panel, etc., and have good stress relaxation rate and durability. The adhesive contains first (methyl) acrylic ester polymers (A) having a Mw of 500-3000 thousands, a component which is produced by cross-linking second (methyl) acrylic ester polymers (B) having a Mw of 80000-300 thousands and an anti-charge agent (D). In the tensile test, the breakage elongation is above 1500%, and the gel fraction is from 30 to 90%.

Description

technical field [0001] The present invention relates to an adhesive and an adhesive sheet, and in particular, an adhesive and an adhesive sheet that are favorably used for optical components such as polarizing plates. Background technique [0002] In general, in a liquid crystal panel, when a polarizing plate and a retardation plate are adhered to a glass substrate of a liquid crystal cell, etc., an adhesive layer formed of an adhesive composition is generally used. However, optical components such as polarizers and retardation plates tend to shrink due to heat or the like, that is, shrink due to thermal changes. As a result, the adhesive layer laminated on the optical components cannot follow the shrinkage. Therefore, peeling (so-called lift-off) occurs at the interface, and the optical axis of the optical member deviates due to stress during shrinkage of the optical member, resulting in a problem of light leakage (so-called white spots). [0003] As a method of preventing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/04C09J133/08C09J11/06C09J7/02G02B5/30
CPCC09J11/00C09J133/04G02B5/30
Inventor 荒井隆行又野仁小泽祐树所司悟
Owner LINTEC CORP
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