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Adhesives and Adhesive Sheets

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

Active Publication Date: 2015-11-25
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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  • Adhesives and Adhesive Sheets
  • Adhesives and Adhesive Sheets
  • Adhesives and Adhesive Sheets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] 1. Modulation of Polymer (A)

[0121] Into the reaction vessel with a stirrer, a thermometer, a return 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, and the air in the reaction container was replaced with nitrogen. The temperature of the reaction solution was raised to 60° C. while stirring in such a nitrogen atmosphere, 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 a polymer (A) having a weight average molecular weight of 1.5 million was produced.

[0122] 2. Modulation of polymer (B)

[0123] Into the reaction vessel with a stirrer, a thermometer, a return cooler, a dropping device and a nitrogen introduction pipe, add 85.0 parts by mass of n-b...

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 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 Except for the changes shown, a polarizer with an adhesive layer was produced in the same manner as in Example 1.

[0148] Here, the above-mentioned 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 measurement device: HLC-8020 manufactured by Tosoh Co., Ltd.

[0151] · GPC column (passed in the following order): manufactured by Tosoh Co., Ltd.

[0152] TSKguardcolumnHXL-H

[0153] TSKgelGMHXL (×2)

[0154] TSKgelG2000HXL

[0155] ·Measurement solvent: tetrahydrofuran

[0156] ·Measurement temper...

experiment example 1

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

[0158] The polarizing plate used in the manufacture of the polarizing plate with an adhesive layer in the examples or comparative examples was changed to one side of the polyethylene terephthalate film with silicone A 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 the structure formed by the release sheet / adhesive layer (thickness: 25 μm) obtained in the manufacturing process of the example or the comparative example, the release sheet is laminated so that the release treatment surface side to side. Thereby, the adhesive sheet which consists of release sheet / adhesive layer / release sheet was produced.

[0159] The obtained adhesive sheet was cured 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 mm, the adhesive...

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PUM

PropertyMeasurementUnit
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Abstract

PURPOSE: An adhesive is provided to have excellent stress releasing performance, and to provide an adhesive sheet with excellent light leak resistance and durability together when applied to an optical element. CONSTITUTION: An adhesive has a maximum stress when drawn is larger than a stress at fracture or 400% elongation. The adhesive comprises 50 wt% or more of a (meth)acrylic ester polymer of which weight average molecular weight is 500,000-3,000,000. A gel fraction is 30-90%. An adhesive sheet(1A) comprises a substrate(13) and an adhesive layer(11) or comprises two pieces of release sheets(12) and an adhesive layer inserted between the release sheet to contact with separated sides of two release sheet. The adhesive layer consists of the adhesive.

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, when a polarizing plate and a retardation plate are bonded to a glass substrate, an adhesive layer formed of an adhesive composition with high tackiness 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. Delamination (so-called lifting, detachment) and shrinkage stress of the optical member cause deviation from the optical axis of the shrunk optical member, causing a problem of light leakage (so-called white spots). [0003] As a method of preventing this problem, (1) adhering an adhesive layer having a high adhesive force and excellent form stability to an optical member such as a pola...

Claims

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Application Information

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Patent Type & Authority Patents(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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