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Adhesive agent and adhesive sheet produced using same

A technology of adhesives and adhesive sheets, applied in the direction of adhesives, adhesive types, ester copolymer adhesives, etc., can solve problems such as air bubbles at the attachment interface, different dimensional change rates, light leakage, etc., and achieve excellent stress relaxation, Excellent re-peelability effect

Active Publication Date: 2015-11-25
TOYO INK SC HOLD CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, these films have different dimensional change rates when heated due to their different mechanical properties. Therefore, when placed in a high-temperature gas environment, warpage often occurs in the above-mentioned laminated body.
[0005] Here, for example, if the laminate of the polarizing plate / adhesive layer / glass (glass is the surface member of the liquid crystal cell) is placed in a high-temperature gas environment, warpage occurs due to the dimensional change rate between the constituent members of the polarizing plate. If it is bent, there will be problems such as generation of air bubbles (foaming) at the bonding interface between the adhesive layer and the glass, and the polarizing plate will float from the glass and peel off.
In addition, due to the warping, the stress distribution of the laminate becomes uneven, and the stress concentrates on the peripheral edge of the laminate. As a result, the so-called "light leakage phenomenon" in which light leaks from the four corners of the laminate or the peripheral edge occurs.

Method used

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  • Adhesive agent and adhesive sheet produced using same
  • Adhesive agent and adhesive sheet produced using same
  • Adhesive agent and adhesive sheet produced using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] Examples of the present invention are shown below and described in more detail, but the present invention is not limited to these Examples. In the examples, "parts" means "parts by weight", and "%" means "% by weight".

Synthetic example 1

[0121]

[0122]In a reaction vessel equipped with a stirrer, a thermometer, a reflux cooling pipe, a dropping device, and a nitrogen introduction pipe (hereinafter referred to as "reaction vessel"), 99.5 parts of butyl acrylate, 0.5 parts of acrylic acid, 100 parts of ethyl acetate, 2, 0.025 parts of 2'-azobisisobutyronitrile (hereinafter referred to as AIBN), and the air in the reaction container was replaced with nitrogen gas. Then, it heated to 80 degreeC, stirring in nitrogen atmosphere, and started reaction. Then, the reaction solution was reacted at reflux temperature for 7 hours. After the reaction was completed, it was cooled, diluted with ethyl acetate, and the non-volatile content was 30%, the viscosity was 3000m (Mw), and the result was that the weight average molecular weight was 1,000,000. Let the obtained copolymer be a copolymer (A-1).

[0123]

[0124] Various raw materials were injected|thrown-in according to the weight ratio of Table 1, and the acrylic ...

Synthetic example 21

[0125]

[0126] 99.8 parts of butyl acrylate, 0.2 part of 2-hydroxyethyl acrylate, 100 parts of ethyl acetate, and 0.025 parts of AIBN were charged into the reaction container, and the air in the reaction container was replaced with nitrogen. Then, it heated to 80 degreeC, stirring in nitrogen atmosphere, and started reaction. Then, the reaction solution was reacted at reflux temperature for 7 hours. After the reaction was completed, it was cooled and diluted with ethyl acetate to obtain a copolymer solution with a non-volatile content of 30% and a viscosity of 3000 mPa·s. Moreover, when the weight average molecular weight (Mw) of an acrylic copolymer was measured using GPC, the weight average molecular weight was 1 million. Let the obtained copolymer be a copolymer (B-1).

[0127]

[0128] According to the weight ratio of Table 2, various raw materials were charged, and the acrylic copolymer (B) was synthesize|combined by the method similar to synthesis example 21. Tab...

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Abstract

The present invention addresses the problem of providing an adhesive agent which enables the production of an adhesive sheet that has excellent removability, is rarely raised from an adherend such as a glass or a plastic material or is rarely detached from the material after being exposed to a high-temperature environment or a high-temperature / high-humidity environment, has a good stress relaxation property, and rarely undergoes the occurrence of indentation on an adhesive agent layer formed therein. An adhesive agent comprising: an acrylic polymer (A) which does not have a hydroxyl group and has a carboxyl group; an acrylic polymer (B) which does not have a carboxyl group and has a hydroxyl group; at least one compound selected from an epoxy compound, a metal chelate compound and an aziridine compound; and a polyisocyanate compound.

Description

technical field [0001] The present invention relates to an adhesive that can be used for members such as plastics and glass. Background technique [0002] Display devices such as liquid crystal displays used in various appliances such as electronic computers, electronic clocks, mobile phones, and televisions are advancing in size, and the size of liquid crystal TVs and plasma TVs is particularly large. In addition, in recent years, liquid crystal displays of a touch panel type typified by smartphones and tablets have spread rapidly, and significant market expansion is also expected in the future. On the other hand, liquid crystal displays are also used in in-vehicle devices such as car navigation systems, and require durability that can be used in severe in-vehicle environments such as high-temperature, high-humidity gas environments. [0003] Furthermore, polarizers, retardation plates, etc. having various optical functions are used in liquid crystal displays, and these po...

Claims

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Application Information

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IPC IPC(8): C09J133/00B32B27/00B32B27/30C09J7/02C09J11/06G02B5/30G02F1/1335
CPCC09J7/0217B32B17/064C09J4/06C09J133/00C09J133/06C09J133/066C09J2203/318C09J2433/00G02B5/30G02F1/133528G02F2202/28B32B17/10C08L33/064C09J7/385
Inventor 福田克哲中村稔阿部忠士田邉慎吾
Owner TOYO INK SC HOLD CO LTD
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