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Adhesive, adhesive sheet and displayer

An adhesive and copolymer-like technology, which is applied in the field of adhesive sheets and displays, can solve the problems of gas generation, poor flexibility, hard material, etc., and achieve excellent foam resistance, excellent peel resistance, and not easy to whiten Effect

Inactive Publication Date: 2014-12-24
TOYO INK SC HOLD CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, plastics with high transparency are hard and poor in flexibility, so it is necessary to mix a large amount of plasticizer to obtain the desired flexibility, processability and formability
However, the plasticizer causes the problem of gas generation (also called "outgassing") between the plastic film and the adhesive layer when the touch screen is used in a high temperature environment

Method used

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  • Adhesive, adhesive sheet and displayer
  • Adhesive, adhesive sheet and displayer
  • Adhesive, adhesive sheet and displayer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Hereinafter, the present invention will be further specifically described in conjunction with examples, but the present invention is not limited by these examples. In addition, in the following examples, "parts by weight" are represented by "parts", and "% by weight" are represented by "%".

Synthetic example 1

[0102] Using a reaction device with a stirrer, a reflux cooling pipe, a nitrogen conduit, a thermometer, and a dropper, 50% by weight of the total amount of each monomer in Table 3, an appropriate amount of azobisisobutyronitrile as an initiator, and acetic acid as a solvent Ethyl ester was added to the reaction tank. Subsequently, all the remaining monomers, and an appropriate amount of ethyl acetate and azobisisobutyronitrile and mixed solution were added dropwise into the reaction tank for about 2 hours from a dropper, and then in a nitrogen environment, Polymerization was carried out at about 80°C for 5 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 40% and a viscosity of 3000 mPa·s. Here, the obtained copolymer is referred to as copolymer (A-1).

Synthetic example 2～36

[0104] Various raw materials were added according to the weight ratios in Table 3 and Table 4, and the acrylic acid copolymer was synthesized by the same method as in Synthesis Example 1. And the weight average molecular weight of the obtained acrylic copolymer is shown in Table 3 and Table 4.

[0105] [table 3]

[0106]

[0107] [Table 4]

[0108]

[0109]

[0110] The measurement of the weight average molecular weight used GPC "LC-GPC system" manufactured by Shimadzu Corporation. GPC is liquid chromatography that separates and quantifies substances dissolved in a solvent (THF:tetrahydrofuran) according to the difference in molecular size, and determines the weight average molecular weight in terms of polystyrene.

[0111] Device name: LC-GPC system "Prominence" manufactured by Shimadzu Corporation

[0112] Column: 4 GMHXL manufactured by Tosoh Corporation and 1 HXL-H manufactured by Tosoh Corporation were connected in series.

[0113] Mobile phase solvent: tetrah...

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Abstract

The invention aims to provide an adhesive having excellent adhesiveness, transparency, non whitening, foaming resistance and peeling resistance and also having a step difference tracing ability. The adhesive contains an acrylic copolymer (A), a polyisocyanate curing agent (B) and a silane coupling agent (C), wherein the acrylic copolymer (A) is formed through free radical polymerization of 20-90 wt% of an ethylenically unsaturated monomer (A1) having the SP value of 8 or more and less than 9.00 and having alkyl, and 10-80 wt% of an ethylenically unsaturated monomer (A2) having the SP value of 9.00 or more and 15 or less and having polar groups, and is a polymer with the weight average molecular weight of 200000-1000000; the ethylenically unsaturated monomer (A2) has more than one polar group selected from the group consisting of hydroxyl (a1), amide (a2), amino (a3) and nitrile (a4), and the glass transition temperature (Tg) of the homopolymer is -40 DEG C or more and 120 DEG C or less.

Description

technical field [0001] This invention relates to adhesives. In addition, it relates to an adhesive sheet and a display formed using the adhesive. Background technique [0002] With the rapid advancement of electronic technology in recent years, various flat panel displays (FPDs), such as liquid crystal displays (LCDs), plasma displays (PDPs), rear projection displays (RPJs), EL displays, and light-emitting diode displays, are widely used as display devices. . In such a display device, various films such as an antireflection film for preventing reflection from an external light source and a protective film (protective film) for preventing scratches on the surface of the display device are generally used. For example, a polarizing film or a retardation film is used in members for liquid crystal elements used in LCDs. [0003] And, the FPD is also used as an input device such as a touch panel. In a touch panel, a protective film, an antireflection film, a transparent electr...

Claims

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Application Information

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IPC IPC(8): C09J133/08C09J133/14C09J7/00C09J7/02
Inventor 福田克哲
Owner TOYO INK SC HOLD CO LTD
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