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Adhesive and adhesive sheet

A technology of adhesives and adhesive layers, applied in the direction of adhesives, adhesive types, ester copolymer adhesives, etc., can solve the problems of poor durability, low adhesive layer strength, and low bonding density , to achieve the effect of excellent light leakage resistance and durability

Active Publication Date: 2012-10-17
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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  • Adhesive and adhesive sheet
  • Adhesive and adhesive sheet
  • Adhesive and adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] 1. Preparation of polymer (A)

[0121] Into a reaction vessel equipped with a stirrer, a thermometer, a return cooler, a dropping device, and a nitrogen introduction tube, 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 were added 0.08 parts by mass of'-azobisisobutyronitrile, and the air in the reaction vessel was replaced with nitrogen. Under such a nitrogen atmosphere, the reaction solution was heated to 60°C while stirring, and after 16 hours of reaction, it was cooled to room temperature. Here, a part of the obtained solution was subjected to GPC measurement by the following method, and it was confirmed that the polymer (A) with a weight average molecular weight of 1.5 million was produced.

[0122] 2. Preparation of polymer (B)

[0123] Into a reaction vessel equipped with a stirrer, a thermometer, a backflow cooler, a dropping device and a nitrogen introduction tube, 85.0 parts by mass of n-butyl ...

Embodiment 2 to 12

[0146] [Examples 2 to 12, Comparative Examples 1 to 5]

[0147] The types and ratios of the monomers constituting the adhesive composition, the types and amounts of plasticizers, binders and silane coupling agents, and the composition of the polymer (A) and polymer (B) are as shown in Table 1. Except for the changes shown, the same as in Example 1 was used to prepare a polarizing plate with an adhesive layer

[0148] Here, the aforementioned 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).

[0149]

[0150] ·GPC measuring device: made by Tosoh Corporation, HLC-8020

[0151] ·GPC column (passed in the following order): Tosoh Corporation

[0152] TSK guard column HXL-H

[0153] TSK gel GMHXL(×2)

[0154] TSK gel G2000HXL

[0155] ·Measuring solvent: tetrahydrofuran

[0156] ·Measurement temperature: 40℃

experiment example 1

[0157] [Experimental Example 1] (Measurement of Gel Ratio)

[0158] The polarizer used in the production of the polarizer with the adhesive layer in the examples or comparative examples was replaced with a polyethylene terephthalate film with silicone on one side A release sheet (SP-PET3801, thickness: 38 μm, manufactured by Lintec Co., Ltd.) that was peeled off by a release agent was used to produce an adhesive sheet. Specifically, the release sheet / adhesive layer (thickness: 25 μm) obtained by the manufacturing process of the embodiment or the comparative example is formed on the exposed adhesive layer of the structure, and the release sheet is laminated so that the release treatment surface Side-connected. Thus, an adhesive sheet composed of a release sheet / adhesive layer / release sheet was produced.

[0159] The obtained adhesive sheet was aged for 7 days under the conditions of 23°C and 50% RH. Thereafter, the adhesive sheet was made into a sample having a size of 80 mm×80 ...

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Abstract

The invention provides an adhesive and an adhesive sheet. The adhesive and the adhesive sheet are advantaged by excellent light leakage resistance and durability when suitable for an optical part such as a polarized light sheet, etc. When the adhesive is stretched, the maximal stress is greater than that of the adhesive in fracture or stretched by 4000%, the adhesive comprises, preferably, more than 50 mass% of a first (methyl) acrylic ester polymer with the weight average molecular weight of 500,000-3,000,000 is contained, and gel fraction is 30-90%, particularly, a component formed by crosslinking of the first (methyl) acrylic ester polymer (A) with the weight average molecular weight of 500,000-3,000,000 and a second (methyl) acrylic ester polymer (B) with the weight average molecular weight of 8,000-300,000 is contained, based on 100 mass parts of the first (methyl) acrylic ester polymer (A), the proportion of the second (methyl) acrylic ester polymer (B) is preferably 5-50 mass parts.

Description

Technical field [0001] The present invention relates to an adhesive and an adhesive sheet, and particularly relates to an adhesive and an adhesive sheet suitable for optical components such as polarizers. Background technique [0002] Generally, in a liquid crystal panel, when adhering a polarizer and a retardation plate to a glass substrate, 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 shrinkage caused by thermal changes. As a result, the adhesive layer laminated on the optical component cannot follow the shrinkage, resulting in interfacial damage. Peeling (so-called floating, peeling), the deviation of the optical component from the optical axis caused by the shrinkage stress of the optical component, causes light leakage (so-called white spots). [0003] As a method of preventing this problem, for example, (1) the adhesive layer with high adhesive fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/04C09J133/08C09J7/02
CPCC09J7/22C09J7/38C09J7/385C09J7/40C09J11/00C09J133/04C09J2203/318C09J2301/302
Inventor 荒井隆行又野仁小泽祐树所司悟
Owner LINTEC CORP
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