An adhesive and adhesion sheet

An adhesive and adhesive layer technology, applied in the directions of adhesives, adhesive types, ester copolymer adhesives, etc., can solve the problems of poor durability, low strength of the adhesive layer, and low bonding density. , to achieve the effect of excellent light leakage resistance and durability, and excellent stress relaxation rate

Inactive Publication Date: 2013-06-12
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventionally, in order to form such an adhesive layer having an excellent stress relaxation rate, it was necessary to lower the bonding density in the adhesive layer.
In this way, there will be a problem that the strength of the adhesive layer itself will be lowered, and the durability will be deteriorated.

Method used

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  • An adhesive and adhesion sheet
  • An adhesive and adhesion sheet
  • An adhesive and adhesion sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] 1. Modulation of Polymer (A)

[0125] Into a reaction vessel with a stirrer, a thermometer, a reflux cooler, a dropping device, and a nitrogen introduction pipe, add 97.0 parts by mass of n-butyl acrylate, 3.0 parts by mass of acrylic acid, 200 parts by mass of ethyl acetate, and 2,2' - 0.08 parts by mass of azobisisobutyronitrile, the air in the reaction container was replaced with nitrogen. While stirring in such a nitrogen atmosphere, 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 subjected to GPC measurement by the following method, and the generation of the polymer (A) having a weight average molecular weight of 1.5 million was confirmed.

[0126] 2. Modulation of polymer (B)

[0127] In a reaction vessel with a stirrer, a thermometer, a reflux cooler, a dropping device, and a nitrogen introduction pipe, add 85.0 parts by mass of n-butyl a...

Embodiment 2 to 13

[0149] [Examples 2 to 13, Comparative Examples 1 to 5]

[0150] The types and ratios of the monomers constituting the adhesive composition, the types and amounts of the plasticizer, the bonding agent and the silane coupling agent, and the composition of the polymer (A) and the polymer (B) are shown in Table 1 A polarizing plate with an adhesive layer was produced in the same manner as in Example 1 except for the changes shown.

[0151] Here, the weight average molecular weight (Mw) is the weight average molecular weight in terms of polystyrene measured by gel permeation chromatography (GPC) under the following conditions (GPC measurement).

[0152]

[0153] ・GPC measurement device: HLC-8020 manufactured by Tosoh Co., Ltd.

[0154] · GPC column (passed in the following order): manufactured by Tosoh Co., Ltd.

[0155] TSK guard column HXL-H

[0156] TSK gel GMHXL (×2)

[0157] TSK gel G2000HXL

[0158] ·Measurement solvent: tetrahydrofuran

[0159] ·Measurement tempera...

experiment example 1

[0160] [Experimental Example 1] (Measurement of Gel Ratio)

[0161] The polarizing plate used in the production of the polarizing plate with an adhesive layer of the example or the comparative example was replaced, and one side of the polyethylene terephthalate film was used for peeling treatment with a silicone-based release agent. A sheet (manufactured by Lintec Corporation, SP-PET3801, thickness: 38 μm) was used to prepare an adhesive sheet. Specifically, on the exposed adhesive layer on the structure composed of the release sheet / adhesive layer (thickness: 25 μm) obtained from the manufacturing process of the example or the comparative example, it is laminated, and the release sheet and the release process Face to side. In this way, an adhesive sheet having a configuration of release sheet / adhesive layer / release sheet was produced.

[0162] The obtained adhesive sheet was aged at 23° C. and 50% RH for 7 days. Thereafter, the adhesive sheet was made into a sample havin...

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PUM

PropertyMeasurementUnit
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Abstract

This invention provides an adhesive and an adhesion strip having the excellence in both aspects of the light leakage tolerance and durability when being applied to an optical device such as a polarizing sheet. The gelling ratio of the adhesive is 45 to 90%, while the weight average molecular weight measured by the gel permeation chromatography of the gel portion is 600,000 to 2,500,000. Preferably, the adhesive contains the ingredient formed by crosslinking a first (meth)acrylate polymer (A) having a weight average molecular weight of 600,000 to 2,500,000 and a second (meth)acrylate polymer (B) having a weight average molecular weight of 8,000 to 300,000.

Description

technical field [0001] The present invention relates to an adhesive agent and an adhesive sheet, and particularly relates to an adhesive agent and an adhesive sheet suitable for optical components such as polarizing plates. Background technique [0002] Generally, in a liquid crystal panel, an adhesive layer formed from an adhesive adhesive composition for adhering a polarizing plate and a retardation plate to a glass substrate or the like is often used. However, optical components such as polarizers and retardation plates tend to shrink due to heat, etc., and shrink due to thermal changes. As a result, the base adhesive layer laminated on the optical component cannot follow the shrinkage, and peeling at the interface occurs. (so-called floating and peeling), and the optical axis of the optical member caused by stress during shrinkage of the optical member deviates, thereby causing a problem of light leakage (so-called white spots). [0003] As a method of preventing this p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/04C09J133/08C09J11/06C09J7/02C09J7/00
CPCC09J7/22C09J7/30C09J7/38C09J7/385C09J133/04C09J2203/318C09J2301/302G02B5/005
Inventor 小泽祐树又野仁荒井隆行所司悟
Owner LINTEC CORP
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