Touch panel

A touch panel, transparent conductive film technology, applied in the direction of instruments, film/sheet adhesives, other household appliances, etc., can solve problems such as corrosion of transparent conductive film, change of resistance value of transparent conductive film, affecting pattern visualization, etc. Achieve excellent step followability and corrosion inhibition effect

Active Publication Date: 2020-08-04
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.
[0007] 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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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0085] (5) Preparation of adhesive composition

[0086] Prepare (meth)acrylate copolymer (A), and add crosslinking agent (B) to obtained (meth)acrylate copolymer (A), and add silane coupling agent (C), additives if necessary , so that the adhesive composition P can be prepared.

[0087] The (meth)acrylate copolymer (A) can be produced by superposing|polymerizing the mixture of the monomeric unit which comprises a polymer by a normal radical polymerization method. The (meth)acrylate copolymer (A) can be superposed|polymerized by the solution polymerization method etc. using a polymerization initiator as needed. As a polymerization solvent, ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone, etc. are mentioned, for example, and 2 or more types may be used together.

[0088] As a polymerization initiator, an azo compound, an organic peroxide, etc. are mentioned, and 2 or more types may be used together. As azo compounds, for example...

Embodiment 1

[0140] 1. Preparation of (meth)acrylate copolymer

[0141] 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). When the molecular weight of this (meth)acrylate copolymer (A) was measured by the method mentioned later, the weight average molecular weight (Mw) was 600,000.

[0142] 2. Preparation of Adhesive Composition

[0143] 100 parts by mass of the (meth)acrylate copolymer (A) obtained in the above step (1) (value in terms of solid content; the same applies hereinafter), trimethylolpropane-modified toluene as a crosslinking agent (B) 0.25 parts by mass of diisocyanate (manufactured by Soken Chemical & Engineering Co., Ltd., product name "L-45"), 3-glycidyl ether propyl trimethoxysilane (Shin-Etsu Chemical Co., Ltd. ., product name "KBM-403") 0.2 parts by mass were mixed and fully stirred, and diluted with...

Embodiment 2～24

[0163] [Examples 2-24, Comparative Examples 1-4]

[0164] The type, ratio, and polymerization average molecular weight (Mw) of each monomer constituting the (meth)acrylate copolymer (A), the type and amount of the crosslinking agent (B), and the amount of the silane coupling agent (C) Except having changed the addition amount as shown in Table 1, it carried out similarly to Example 1, and produced the adhesive sheet. Moreover, about Examples 7-9, the benzyl benzoate (made by Tokyo Chemical Industry Co., Ltd.) was further added as a refractive index adjuster to an adhesive composition. The amount added is shown in Table 1.

[0165] Here, the said weight average molecular weight (Mw) is the polystyrene equivalent weight average molecular weight measured by gel permeation chromatography (GPC) under the following conditions (GPC measurement).

[0166]

[0167] - GPC measurement device: HLC-8020 manufactured by Tosoh Corporation

[0168] · GPC column (passed in the following o...

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Abstract

The invention provides a touch panel (2) which is a capacitive touch panel (2). The touch panel is provided with two transparent conductive films (52) or a transparent conductive film (52) and a covermaterial (6) and is also provided with an adhesive layer (11) located between the two transparent conductive films (52) or between the transparent conductive film (52) and the cover material (6). Thetransparent conductive film (52) has a circuit pattern, and the adhesive layer (11) is formed from an adhesive, wherein the adhesive has a refractive index of 1.45-1.54, a storage elastic modulus atthe temperature of 80 DEG C of 0.02-0.10 MPa, and does not contain a component having a carboxyl group. According to the touch panel (2), the circuit pattern of the transparent conductive film (52) isnot obvious, the segment gap following performance is excellent, and the adverse effect on the transparent conductive film (52) due to carboxyl is avoided.

Description

[0001] The present invention is a divisional application with the application number 201480076820.7, the filing date is March 4, 2014, and the invention name is "adhesive and adhesive sheet". technical field [0002] The present invention relates to a touch panel, an adhesive and an adhesive sheet that can be used for a touch panel or the like. Background technique [0003] In recent years, various mobile electronic devices such as smartphones and tablet PCs are increasingly using capacitive touch panels as displays. [0004] There are various configurations in the capacitive touch panel, and a typical example includes a configuration including a display module such as a liquid crystal module, and a first film sensor laminated on the display via an adhesive layer. On the module; the second thin film sensor is laminated on the first thin film sensor through the adhesive layer; and the cover material is laminated on the second thin film sensor through the adhesive layer. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/25C09J7/30C09J133/08C09J11/06G06F3/044
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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