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Adhesives and Adhesive Sheets

A technology of adhesives and adhesive layers, applied in the direction of adhesives, adhesive types, ester copolymer adhesives, etc., can solve the problems of transparent conductive film corrosion, transparent conductive film resistance value change, affecting pattern visualization, etc., to achieve Excellent step followability and corrosion inhibitory effect

Active Publication Date: 2020-03-31
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, if the adhesive of the adhesive layer in contact with the transparent conductive film contains carboxylic acid (carboxyl group), there will be a problem of corrosion of the transparent conductive film or a change in the resistance value of the transparent conductive film.
[0006] Furthermore, in a touch panel having a transparent conductive film patterned as described above, there is a so-called pattern visualization problem in which the appearance is affected by seeing the circuit pattern of the transparent conductive film.
This problem tends to occur particularly significantly when the touch panel is exposed to high temperatures

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

preparation example Construction

[0078] (5) Preparation of adhesive composition

[0079] The (meth)acrylate copolymer (A) is prepared, and the crosslinking agent (B) is added to the obtained (meth)acrylate copolymer (A), and the silane coupling agent (C) and additives are added as needed , So that the adhesive composition P can be prepared.

[0080] The (meth)acrylate copolymer (A) can be prepared by polymerizing a mixture of monomer units constituting the polymer by a normal radical polymerization method. If necessary, the (meth)acrylate copolymer (A) can be polymerized by a solution polymerization method or the like using a polymerization initiator. As the polymerization solvent, for example, ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone, etc. may be mentioned, and two or more kinds may be used in combination.

[0081] As a polymerization initiator, an azo compound, an organic peroxide, etc. may be mentioned, and 2 or more types may be used together. As the azo ...

Embodiment 1

[0133] 1. Preparation of (meth)acrylate copolymer

[0134] Copolymerize 30 parts by mass of butyl acrylate, 30 parts by mass of 2-ethylhexyl acrylate, 20 parts by mass of methyl methacrylate, and 20 parts by mass of 2-hydroxyethyl acrylate to prepare a (meth)acrylate copolymer (A). As a result of measuring the molecular weight of the (meth)acrylate copolymer (A) by the method described later, the weight average molecular weight (Mw) was 600,000.

[0135] 2. Preparation of adhesive composition

[0136] 100 parts by mass of the (meth)acrylate copolymer (A) obtained in the above step (1) (solid content conversion value; the same below), and trimethylolpropane-modified toluene as a crosslinking agent (B) Diisocyanate (manufactured by Soken Chemical & Engineering Co., Ltd., product name "L-45") 0.25 parts by mass, 3-glycidyl ether propyl trimethoxysilane (Shin-Etsu Chemical Co., Ltd.) as a silane coupling agent Manufacture, product name "KBM-403") 0.2 parts by mass were mixed and fully...

Embodiment 2～24

[0156] [Examples 2-24, Comparative Examples 1-4]

[0157] The type, ratio and polymerization average molecular weight (Mw) of each monomer constituting the (meth)acrylate copolymer (A), the type and amount of crosslinking agent (B), and the silane coupling agent (C) Except that the addition amount was changed as shown in Table 1, an adhesive sheet was prepared in the same manner as in Example 1. In addition, regarding Examples 7 to 9, benzyl benzoate (manufactured by Tokyo Chemical Industry Co., Ltd.) as a refractive index modifier was further added to the adhesive composition. The addition amount is shown in Table 1.

[0158] Here, the 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).

[0159]

[0160] ·GPC measuring device: manufactured by Tosoh Corporation, HLC-8020

[0161] ·GPC column (passed in the following order): manufactured by T...

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Abstract

The present invention provides an adhesive and an adhesive sheet. The adhesive of the present invention is used between two transparent conductive films or between a transparent conductive film and a cover material in a touch panel of an electrostatic capacitance method. The refractive index of the adhesive is The ratio is 1.45 to 1.54, the storage elastic modulus at 80° C. is 0.02 to 0.10 MPa, and does not contain a component having a carboxyl group. The adhesive sheet (1) includes an adhesive layer (11) made of an adhesive. According to the adhesive agent and the adhesive sheet (1), the circuit pattern of the transparent conductive film can be made inconspicuous, the step followability is excellent, and the transparent conductive film is not adversely affected by the carboxyl group.

Description

Technical field [0001] The present invention relates to an adhesive and an adhesive sheet that can be used for touch panels and the like. Background technique [0002] In recent years, in various mobile electronic devices such as smartphones and tablet computers, the use of capacitive touch panels as displays has gradually increased. [0003] There are many types of structures in capacitive touch panels. As a typical example, the following structure can be exemplified, including: a display module such as a liquid crystal module; a first thin film sensor laminated on the display through an adhesive layer On the module; the second thin film sensor is laminated on the first thin film sensor via the adhesive layer; and the cover material is laminated on the second thin film sensor via the adhesive layer. [0004] Here, on the display module side of the cover material, a frame-shaped printed layer sometimes exists as a step. If the adhesive layer does not follow the level difference, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J7/25C09J7/40C09J133/08B32B7/12B32B27/36B32B27/30B32B27/08G06F3/041
CPCB32B7/12C09J133/066B32B27/08B32B27/308B32B27/36B32B2307/202B32B2307/412B32B2307/418B32B2307/51B32B2307/714B32B2457/208C09D133/066C08K5/5435C08F220/1804C08F220/1808C08F220/14C08F220/20C09J7/255C09J7/20C08K5/5415C09J133/06C09J2203/318
Inventor 荒井隆行小泽祐树高桥洋一
Owner LINTEC CORP
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