Representation

Abstract

To provide a display body capable of effectively preventing and suppressing migration.SOLUTION: A display body includes: a first display body-constituting member; a second display body-constituting member; and an adhesive layer for mutually bonding the first display body-constituting member, and the second display body-constituting member, where a surface of at least a side bonded with the first display body-constituting member and / or the second display body-constituting member has wiring composed of a metal or a metal oxide, the adhesive layer is composed of an adhesive containing an antirust agent, and a coverage calculated by dividing an adhesive agent volume (μm3) per 1 mm2 in a planar view of the adhesive layer by a wiring volume (μm3) per 1 mm2 in a planar view of the wiring is 200 or more.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a display suitable for use as, for example, a capacitive touch panel. [Background technology]

[0002] In recent years, touch panels have come to be used as displays in many mobile electronic devices such as smartphones and tablet terminals. Touch panel types include resistive and capacitive types, but the capacitive type is mainly used in such mobile electronic devices.

[0003] Recently, efforts have been made to enlarge touch panels, and mesh-shaped metal electrodes, such as copper electrodes or silver electrodes, have been considered as electrode materials for such touch panels. However, when a conventional adhesive is used in contact with a metal electrode, particularly a copper electrode or a silver electrode, ion migration (electrochemical migration; hereinafter simply referred to as "migration") may occur. Specifically, the electrode may dissolve and break at the positive electrode, and dendrites may form at the negative electrode due to precipitation of the positive electrode components, causing a short circuit.

[0004] This migration is particularly likely to occur when voltage is applied to the electrodes under high temperature and humidity conditions. When this type of migration occurs, the resistance value changes and the touch panel will no longer operate normally. In recent years, as electrodes have become finer and their pitches narrower, migration has become more likely to cause disconnections and short circuits in electrodes, making it desirable to fully prevent and suppress migration.

[0005] Incidentally, Patent Document 1 discloses a pressure-sensitive adhesive composition for touch panels, which contains a benzotriazole compound as a rust inhibitor. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2014-177611 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, although benzotriazole compounds as rust inhibitors have the effect of preventing corrosion of metal wiring, they cannot sufficiently prevent or suppress migration.

[0008] The present invention has been made in view of the above-mentioned circumstances, and has an object to provide a display medium capable of effectively preventing and suppressing migration. [Means for solving the problem]

[0009] In order to achieve the above object, first, the present invention provides a display comprising a first display member constituting member, a second display member constituting member, and an adhesive layer for bonding the first display member constituting member and the second display member constituting member to each other, wherein the first display member constituting member and / or the second display member constituting member have wiring made of metal or metal oxide at least on the surface on which they are bonded, the adhesive layer is made of an adhesive containing a rust inhibitor, and the adhesive layer has a thickness of 1 mm in a plan view. 2 Adhesive volume per unit (μm 3 ) at 1 mm 2 Wiring volume per unit (μm 3 The present invention provides a display body having a degree of coverage calculated by dividing the coverage by the surface area of ​​the display by the surface area of ​​the display, which is 200 or more (Invention 1).

[0010] In the display body of the above invention (Invention 1), even if the first display body component and / or the second display body component have wiring made of metal or metal oxide on at least the surface on which they are attached, the adhesive layer is made of an adhesive containing a rust inhibitor, and the adhesive layer is 1 mm thick in plan view. 2 Adhesive volume per unit (μm 3 ) 1mm in plan view of the wiring 2 Wiring volume per unit (μm3 ) is 200 or more, the adhesive layer with the rust inhibitor segregated on the surface can sufficiently cover the wiring. This makes it easier for the rust inhibitor to effectively exert its effect, and migration can be effectively prevented and suppressed.

[0011] In the above invention (Invention 1), when the content of the rust inhibitor in the pressure-sensitive adhesive is α mass % and the thickness of the pressure-sensitive adhesive layer is Z μm, it is preferable that the following formula is satisfied (Invention 2). 0.5<α×Z≦100

[0012] In the above inventions (Inventions 1 and 2), the content of the rust inhibitor in the pressure-sensitive adhesive is preferably 0.001% by mass or more and 1% by mass or less (Invention 3).

[0013] In the above inventions (Inventions 1 to 3), the rust inhibitor is preferably an azole (Invention 4).

[0014] In the above inventions (Inventions 1 to 4), the pressure-sensitive adhesive is preferably an acrylic pressure-sensitive adhesive (Invention 5). Effect of the Invention

[0015] According to the display according to the present invention, migration can be effectively prevented and suppressed. [Brief description of the drawings]

[0016] [Figure 1] 1 is a cross-sectional view of an example of the configuration of an adhesive sheet that can be used to manufacture a display according to one embodiment of the present invention. [Diagram 2] 1 is a cross-sectional view showing a display (touch panel) according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described. The display according to this embodiment comprises a first display member, a second display member, and an adhesive layer for bonding the first display member and the second display member to each other. The adhesive layer is made of an adhesive containing a rust inhibitor. Here, the first display member and / or the second display member have wiring made of metal or metal oxide on at least the surface to be bonded (the adhesive layer side). The adhesive layer has a thickness of 1 mm in plan view. 2 Adhesive volume per unit (μm 3 ) at 1mm above the wiring 2 Wiring volume per unit (μm 3 ) (hereinafter, sometimes simply referred to as "degree of coverage") is preferably 200 or more.

[0018] In the display according to the present embodiment, the wiring made of metal or metal oxide is prevented or suppressed from dissolving at the positive electrode, and the formation of dendrites at the negative electrode is prevented or suppressed. That is, migration at the electrodes is effectively prevented or suppressed (this effect may be referred to as the "migration prevention effect"), and the change in the resistance value of the electrodes can be suppressed. Furthermore, by effectively preventing or suppressing migration, even if the first display component and / or the second display component have wiring that is, for example, finer and narrower in pitch, disconnection or short circuit of the wiring is prevented. In particular, when the wiring is an electrode of a touch panel, driving failure of the touch panel caused by disconnection or short circuit is prevented.

[0019] The reason why the above effect occurs is not clear, but is presumed to be as follows. The adhesive layer of the display according to this embodiment is composed of an adhesive containing a rust inhibitor. The rust inhibitor tends to segregate on the surface of the adhesive layer. And, since the coverage is within the above range, the adhesive layer with the rust inhibitor segregated on the surface can sufficiently cover the wiring made of metal or metal oxide. It is presumed that the rust inhibitor can easily exert its action effectively and can exhibit an excellent migration prevention effect. In addition, it is considered that the coordination part such as a diamino group in the rust inhibitor coordinates and bonds to the metal atom of the wiring to form a chelate compound, forming an anti-rust coating, by sufficiently covering the wiring made of metal or metal oxide with the adhesive layer with the rust inhibitor segregated on the surface, and migration is easily generated by the infiltration of moisture into the electrode, but the infiltration of moisture is suppressed by the formation of the coating, and it is presumed that the display according to this embodiment can exhibit an excellent migration prevention effect.

[0020] Here, in a display body in which the wiring is made finer and narrower in pitch, the distance between the wirings (hereinafter, sometimes referred to as the "distance between wirings") is short, so the contact area of ​​the adhesive layer with the wirings is large. If the contact area is large, the rust inhibitor is used more to form an anti-rust coating by the above-mentioned coordinate bond, and it is considered that the problem of the concentration of the rust inhibitor in the vicinity of the wirings being easily reduced occurs. In particular, since the rust inhibitor concentration in the adhesive between the wirings is easily reduced, moisture tends to penetrate and accumulate, and it is considered that the supply of the rust inhibitor from the adhesive above the wiring to the adhesive between the wirings tends to be hindered. In this way, it is presumed that migration is more likely to occur if the concentration of the rust inhibitor in the vicinity of the wirings is reduced even partially. In the display body according to this embodiment, the adhesive layer is made of an adhesive containing a rust inhibitor, and the coverage is as described above, so that the above problem caused by the wiring being made finer and narrower in pitch can be solved. Specifically, by increasing the total amount of the rust inhibitor contained in the adhesive layer, the rust inhibitor is continuously supplied from the adhesive on the wiring to the adhesive between the wiring, and the rust inhibitor concentration in the adhesive between the wiring can be suppressed from decreasing. This makes it possible to maintain the rust inhibitor concentration in the vicinity of the wiring uniform. As a result, it is assumed that the action of the rust inhibitor is more effectively exerted and an excellent migration prevention effect can be exerted.

[0021] In this specification, the coverage is calculated as follows. First, a 1 mm2 plan view of a metal or metal oxide wiring 2 (1000μm×1000μm) 3 ) is calculated as follows. In wiring made of metal or metal oxide, the wiring width is A (μm), the distance between the wirings is B (μm), and the wiring thickness is C (μm). The length of the wiring in the direction perpendicular to the wiring width and the distance between the wirings is 1000 μm. In this case, the wiring volume per wiring is Aμm×Cμm×1000μm(μm 3 ) The number of wires per 1 mm (1000 μm) in the wire width direction (wire-to-wire distance direction) is 1000μm / (A+B)(pcs) The number of wires is rounded down to the nearest integer. Therefore, the plan view of the above wiring is 1 mm 2 Wiring volume per unit (μm 3 ) is calculated by the following formula (1). Volume per wire {Aμm×Cμm×1000} × number of wires {1000μm / (A+B)} (1) Next, the adhesive layer is measured in plan view at 1 mm 2 Adhesive volume per (1000μm×1000μm) (μm 3 ) is calculated by the following formula (2), where the thickness of the pressure-sensitive adhesive layer is Z μm. Zμm×1000μm×1000μm(μm 3 ) · · · (2) In addition, although the wiring is embedded in the adhesive layer, the volume of the wiring is very small compared to the volume of the adhesive, so the above adhesive volume (μm 3 ) is the value of the above formula (2). The coverage was calculated by dividing (2) by (1).

[0022] The degree of coverage is preferably 200 or more, more preferably 250 or more, particularly preferably 300 or more, and even more preferably 330 or more. The upper limit of the degree of coverage is not particularly limited, but is preferably 10,000 or less, more preferably 5,000 or less, particularly preferably 2,000 or less, and even more preferably 1,500 or less. In particular, from the viewpoint of exhibiting an excellent migration prevention effect even in the case of wiring with finer and narrower pitch, it is preferably 1,200 or less, more preferably 1,000 or less, and from the viewpoint of exhibiting an excellent migration prevention effect even in the case of a thin adhesive layer, it is particularly preferably 800 or less, even more preferably 600 or less, and most preferably 500 or less. By having the degree of coverage within the above range, the adhesive layer with the rust inhibitor segregated on the surface layer can sufficiently cover the wiring. In addition, the rust inhibitor is continuously supplied from the adhesive on the upper part of the wiring to the adhesive between the wiring, and the concentration of the rust inhibitor near the wiring can be uniformly maintained. This allows the rust inhibitor to exert its effect effectively, and an excellent migration prevention effect can be exhibited, and the change in the resistance value of the electrode can be effectively suppressed. Furthermore, by maintaining the concentration of the rust inhibitor uniform in the vicinity of the wiring, the formation of a coating by the rust inhibitor can be maintained over time, and color changes in the wiring and the adhesive layer can be suppressed.

[0023] The adhesive layer of the display according to the present embodiment can be preferably formed by an adhesive layer of an adhesive sheet described below, although the present invention is not limited thereto as long as the above-mentioned physical properties are satisfied.

[0024] [Adhesive sheet] One example of an adhesive sheet capable of producing a display according to one embodiment of the present invention comprises a first display component, a second display component, and an adhesive layer for bonding the first display component and the second display component to each other, and preferably has a release sheet laminated to one or both sides of the adhesive layer.

[0025] A specific configuration of an example of an adhesive sheet from which a display according to the present embodiment can be manufactured is shown in Fig. 1. As shown in Fig. 1, the adhesive sheet 1 is composed of two release sheets 12a, 12b and an adhesive layer 11 sandwiched between the two release sheets 12a, 12b so as to contact the release surfaces of the two release sheets 12a, 12b. However, the release sheets 12a, 12b are not essential components of the adhesive sheet 1, and are peeled off and removed when the adhesive sheet 1 is used. In this specification, the release surface of the release sheet refers to a surface of the release sheet that has releasability, and includes both a surface that has been subjected to a release treatment and a surface that exhibits releasability even without being subjected to a release treatment.

[0026] 1. Each component 1-1. Adhesive layer The adhesive constituting the adhesive layer 11 of the adhesive sheet 1 is not particularly limited as long as it contains a rust inhibitor. The type of adhesive may be, for example, any of an acrylic adhesive, a polyester adhesive, a polyurethane adhesive, a rubber adhesive, a silicone adhesive, etc. The adhesive may be any of an emulsion type, a solvent type, or a solventless type, and may be any of a crosslinked type or a non-crosslinked type. Among them, an acrylic adhesive is preferable because of its excellent adhesive properties and optical properties.

[0027] Specifically, the above-mentioned adhesive is preferably obtained from an adhesive composition (hereinafter sometimes referred to as "adhesive composition P") containing a (meth)acrylic acid ester polymer (A) and a rust inhibitor (B), and is particularly preferably obtained by crosslinking an adhesive composition containing a (meth)acrylic acid ester polymer (A), a rust inhibitor (B) and a crosslinking agent (C), and is further preferably obtained by crosslinking an adhesive composition containing a (meth)acrylic acid ester polymer (A), a rust inhibitor (B), a crosslinking agent (C) and a silane compound (D). In this specification, (meth)acrylic acid ester means both acrylic acid ester and methacrylic acid ester. The same applies to other similar terms. In addition, the concept of "copolymer" is also included in "polymer".

[0028] The adhesive obtained from the adhesive composition P may be an active energy ray curable adhesive that is cured by irradiation with active energy rays, or an active energy ray non-curable adhesive that is not cured by irradiation with active energy rays. In the case of an active energy ray curable adhesive, it is preferable that the adhesive composition P further contains an active energy ray curable component (E).

[0029] (1) Components of the adhesive composition (1-1) (Meth)acrylic acid ester polymer (A) The (meth)acrylic acid ester polymer (A) preferably contains a reactive functional group-containing monomer having a reactive functional group in the molecule as a monomer constituting the polymer. By containing this reactive functional group-containing monomer, it reacts with the crosslinking agent (C) described later through the reactive functional group derived from the reactive functional group-containing monomer, thereby forming a crosslinked structure (three-dimensional network structure), and a pressure-sensitive adhesive having a predetermined cohesive strength is obtained.

[0030] The reactive functional group-containing monomer contained in the (meth)acrylic acid ester polymer (A) as a monomer unit constituting the polymer is preferably a monomer having a hydroxyl group in the molecule (hydroxyl group-containing monomer), a monomer having a carboxyl group in the molecule (carboxyl group-containing monomer), a monomer having an amino group in the molecule (amino group-containing monomer), etc. These reactive functional group-containing monomers may be used alone or in combination of two or more kinds.

[0031] Among the above reactive functional group-containing monomers, hydroxyl group-containing monomers are particularly preferred because they have excellent reactivity with the crosslinking agent (C) and have little adverse effect on electrodes.

[0032] Examples of the hydroxyl group-containing monomer include (meth)acrylic acid hydroxyalkyl esters such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate. Among them, from the viewpoint of reactivity with the crosslinking agent (C), 2-hydroxyethyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate are preferred, 2-hydroxyethyl acrylate and 4-hydroxybutyl acrylate are more preferred, and 2-hydroxyethyl acrylate is particularly preferred. These may be used alone or in combination of two or more.

[0033] The (meth)acrylic acid ester polymer (A) preferably contains 6% by mass or more of reactive functional group-containing monomers (particularly hydroxyl group-containing monomers) as monomer units constituting the polymer, more preferably 9% by mass or more, particularly preferably 12% by mass or more, and even more preferably 15% by mass or more. In the case of fine and narrow-pitched wiring or when the thickness of the adhesive layer is thin, from the viewpoint of making it easier to exhibit the effect of the rust inhibitor (B) described later, it is preferable to contain 18% by mass or more, particularly preferably 20% by mass or more. Moreover, the (meth)acrylic acid ester polymer (A) preferably contains 35% by mass or less of reactive functional group-containing monomers (particularly hydroxyl group-containing monomers) as monomer units constituting the polymer, particularly preferably 30% by mass or less, and even more preferably 25% by mass or less.

[0034] When the (meth)acrylic acid ester polymer (A) contains the reactive functional group-containing monomer as a monomer unit in the above amount, the adhesive strength and cohesive strength of the resulting adhesive are well balanced. In particular, when the reactive functional group-containing monomer is a hydroxyl group-containing monomer, when the (meth)acrylic acid ester polymer (A) contains the hydroxyl group-containing monomer as a monomer unit in the above amount, a predetermined amount of hydroxyl groups, which are hydrophilic groups, remain in the resulting adhesive. As a result, even if moisture is present, the moisture is captured by the hydroxyl groups. In particular, the hydroxyl groups contained in the adhesive on the upper part of the wiring capture moisture, and it is possible to suppress the accumulation of moisture in the adhesive between the wiring. This suppresses the infiltration of moisture into the electrode adjacent to the adhesive layer. Furthermore, the supply of the rust inhibitor from the adhesive on the upper part of the wiring to the adhesive between the wiring is less likely to be hindered, making it easier to maintain a uniform concentration of the rust inhibitor near the wiring. As a result, an excellent migration prevention effect can be exhibited.

[0035] It is preferable that the (meth)acrylic acid ester polymer (A) does not contain a carboxyl group-containing monomer as a monomer unit constituting the polymer. Since the carboxyl group is an acid component, there is a concern that the resistance value change due to corrosion of the electrode with which the pressure-sensitive adhesive comes into contact occurs, but by not containing a carboxyl group-containing monomer, corrosion of the electrode can be prevented and the resistance value change can be effectively prevented or suppressed. However, the above-mentioned "not containing a carboxyl group-containing monomer" means that the carboxyl group-containing monomer is allowed to be contained to an extent that the electrode with which the obtained pressure-sensitive adhesive comes into contact is not adversely affected. Specifically, the (meth)acrylic acid ester polymer (A) is allowed to contain a carboxyl group-containing monomer as a monomer unit in an amount of 0.1 mass% or less, preferably 0.01 mass% or less, and more preferably 0.001 mass% or less.

[0036] In addition, the (meth)acrylic acid ester polymer (A) preferably contains a (meth)acrylic acid alkyl ester as a monomer unit constituting the polymer, which allows the polymer to exhibit good adhesiveness.

[0037] In particular, the (meth)acrylic acid ester polymer (A) preferably contains, as monomer units constituting the polymer, a (meth)acrylic acid alkyl ester having an alkyl group having 2 to 20 carbon atoms and having a glass transition temperature (Tg) of 0°C or less as a homopolymer, and a monomer having a glass transition temperature (Tg) of more than 0°C as a homopolymer, in addition to the reactive functional group-containing monomer described above.

[0038] The (meth)acrylic acid ester polymer (A) can exhibit preferable adhesiveness by containing, as a monomer unit constituting the polymer, a (meth)acrylic acid alkyl ester (hereinafter sometimes referred to as "low Tg alkyl acrylate") having a glass transition temperature (Tg) of 0°C or less as a homopolymer and having an alkyl group with 2 to 20 carbon atoms. From this viewpoint, the (meth)acrylic acid ester polymer (A) preferably contains, as a monomer unit constituting the polymer, 30% by mass or more of the low Tg alkyl acrylate, more preferably 40% by mass or more, particularly preferably 50% by mass or more, and even more preferably 60% by mass or more. The (meth)acrylic acid ester polymer (A) preferably contains, as a monomer unit constituting the polymer, 90% by mass or less of the low Tg alkyl acrylate as an upper limit, particularly preferably 80% by mass or less, and even more preferably 70% by mass or less. When the upper limit of the content of the low Tg alkyl acrylate is within the above range, suitable amounts of other monomer components can be introduced into the (meth)acrylic acid ester polymer (A).

[0039] Preferred examples of low Tg alkyl acrylates include ethyl acrylate (Tg-20°C), n-butyl acrylate (Tg-55°C), isobutyl acrylate (Tg-26°C), n-octyl acrylate (Tg-65°C), isooctyl acrylate (Tg-58°C), 2-ethylhexyl acrylate (Tg-70°C), 2-ethylhexyl methacrylate (Tg-10°C), isononyl acrylate (Tg-58°C), isodecyl acrylate (Tg-60°C), isodecyl methacrylate (Tg-41°C), n-lauryl acrylate (Tg-23°C), n-lauryl methacrylate (Tg-65°C), tridecyl acrylate (Tg-55°C), tridecyl methacrylate (-40°C), and isostearyl acrylate (Tg-18°C). Among them, from the viewpoint of more effectively imparting adhesion as a low Tg alkyl acrylate, it is more preferable that the Tg of the homopolymer is −40° C. or less, and particularly preferable that it is −50° C. or less. Specifically, n-butyl acrylate and 2-ethylhexyl acrylate are particularly preferable, and from the viewpoint of effectively suppressing migration, 2-ethylhexyl acrylate is even more preferable. These may be used alone or in combination of two or more kinds. The alkyl group in the (meth)acrylic acid alkyl ester having 2 to 20 carbon atoms in the alkyl group refers to a linear, branched, or cyclic alkyl group.

[0040] In addition, from the viewpoint of effectively suppressing migration by improving the hydrophobicity of the obtained pressure-sensitive adhesive layer, at least a part of the low Tg alkyl acrylate is preferably a (meth)acrylic acid alkyl ester having 5 or more carbon atoms in the alkyl group, and more preferably a (meth)acrylic acid alkyl ester having 7 or more carbon atoms in the alkyl group. Specifically, 2-ethylhexyl acrylate is particularly preferred. In addition, from the viewpoint of effectively suppressing migration, the proportion of the (meth)acrylic acid alkyl ester having 5 or more carbon atoms in the alkyl group (preferably 7 or more) in the entire low Tg alkyl acrylate is preferably 40% by mass or more, more preferably 60% by mass or more, particularly preferably 80% by mass or more, and most preferably 100% by mass.

[0041] In addition, the (meth)acrylic acid ester polymer (A) contains, as a monomer unit constituting the polymer, a monomer having a glass transition temperature (Tg) as a homopolymer exceeding 0° C. (hereinafter, sometimes referred to as a "hard monomer"), so that the resulting pressure-sensitive adhesive tends to have appropriate cohesive strength and adhesiveness. As a result, the resulting pressure-sensitive adhesive layer tends to suppress defects such as lifting and peeling at the interface with the adherend even after durability conditions.

[0042] Examples of the hard monomer include methyl acrylate (Tg 10° C.), methyl methacrylate (Tg 105° C.), ethyl methacrylate (Tg 65° C.), n-butyl methacrylate (Tg 20° C.), isobutyl methacrylate (Tg 48° C.), t-butyl methacrylate (Tg 107° C.), n-stearyl acrylate (Tg 30° C.), n-stearyl methacrylate (Tg 38° C.), cyclohexyl acrylate (Tg 15° C.), cyclohexyl methacrylate (Tg 66° C.), phenoxyethyl acrylate (Tg 5° C.), phenoxyethyl meth ... Preferred examples of the monomers include acrylic monomers such as acrylate (Tg 54°C), benzyl methacrylate (Tg 54°C), isobornyl acrylate (Tg 94°C), isobornyl methacrylate (Tg 180°C), acryloylmorpholine (Tg 145°C), adamantyl acrylate (Tg 115°C), adamantyl methacrylate (Tg 141°C), dimethylacrylamide (Tg 89°C), acrylamide (Tg 165°C), vinyl acetate (Tg 32°C), and styrene (Tg 80°C), and from the viewpoint of compatibility, acrylic monomers are more preferred. These may be used alone or in combination of two or more.

[0043] In particular, from the viewpoint of imparting suitable cohesive strength and adhesiveness to the resulting pressure-sensitive adhesive and effectively suppressing the occurrence of defects such as lifting and peeling at the interface with the adherend, the glass transition temperature (Tg) of the hard monomer is more preferably 60° C. or higher, and particularly preferably 90° C. or higher. In addition, in consideration of compatibility and copolymerizability with other monomers constituting the (meth)acrylic acid ester polymer (A), the glass transition temperature (Tg) of the hard monomer is preferably 250° C. or lower, more preferably 200° C. or lower, and particularly preferably 150° C. or lower.

[0044] Among the above hard monomers, from the viewpoint of exerting the performance of the hard monomers while preventing adverse effects on other properties such as compatibility with other components, it is preferable to contain at least one selected from the group consisting of methyl methacrylate, isobornyl acrylate, and acryloylmorpholine. In particular, it is preferable to use methyl methacrylate alone or to use isobornyl acrylate and acryloylmorpholine in combination.

[0045] From the viewpoint of imparting suitable cohesive strength and adhesiveness to the resulting pressure-sensitive adhesive, the above-mentioned hard monomer is contained in the (meth)acrylic acid ester polymer (A) in an amount of preferably 5% by mass or more, more preferably 10% by mass or more, and particularly preferably 15% by mass or more, as a monomer constituting the polymer.

[0046] In addition, from the viewpoint of ensuring excellent compatibility between the obtained (meth)acrylic acid ester polymer (A) and other components, the hard monomer is preferably contained in an amount of 50 mass% or less, more preferably 40 mass% or less, and particularly preferably 30 mass% or less, as a monomer constituting the polymer.

[0047] The (meth)acrylic acid ester polymer (A) may contain other monomers as monomer units constituting the polymer, if desired. As the other monomers, monomers not containing reactive functional groups are preferred so as not to interfere with the action of the reactive functional group-containing monomer. Examples of such other monomers include (meth)acrylic acid alkoxyalkyl esters such as methoxyethyl (meth)acrylate and ethoxyethyl (meth)acrylate. These may be used alone or in combination of two or more.

[0048] The (meth)acrylic acid ester polymer (A) is preferably a solution polymer obtained by a solution polymerization method. By using a solution polymer, a high molecular weight polymer can be easily obtained, and an adhesive having excellent durability can be obtained. In addition, even in the case of fine and narrow-pitch wiring or when the thickness of the adhesive layer is thin, an adhesive that can more easily exhibit the effect of the rust inhibitor (B) described later can be easily obtained.

[0049] The polymerization mode of the (meth)acrylic acid ester polymer (A) may be a random copolymer or a block copolymer.

[0050] The lower limit of the weight average molecular weight of the (meth)acrylic acid ester polymer (A) is preferably 200,000 or more, more preferably 450,000 or more, particularly preferably 550,000 or more, and from the viewpoint of suppressing the change in the resistance value of the electrode and suppressing the color change of the wiring and the adhesive layer, it is more preferable that it is 650,000 or more. When the lower limit of the weight average molecular weight of the (meth)acrylic acid ester polymer (A) is as above, the obtained adhesive has excellent durability, and the rust inhibitor (B) is easily segregated on the surface of the adhesive layer. The weight average molecular weight in this specification is a value measured by gel permeation chromatography (GPC) in terms of standard polystyrene.

[0051] The upper limit of the weight average molecular weight of the (meth)acrylic acid ester polymer (A) is preferably not more than 2 million, particularly preferably not more than 1.5 million, and further preferably not more than 1 million. When the upper limit of the weight average molecular weight of the (meth)acrylic acid ester polymer (A) is within the above range, the resulting pressure-sensitive adhesive exhibits suitable adhesive properties.

[0052] In the pressure-sensitive adhesive composition P, the (meth)acrylic acid ester polymer (A) may be used alone or in combination of two or more kinds.

[0053] (1-2) Rust inhibitor (B) The rust inhibitor (B) in this embodiment is preferably one that segregates favorably on the surface of the adhesive layer. Such rust inhibitor (B) is likely to be present stably on the surface of the adhesive layer, and therefore can effectively exert its action and contribute to the migration prevention effect. Examples of such rust inhibitor (B) include azoles such as azole compounds, triazole compounds, benzotriazole compounds, thiazole compounds, benzothiazole compounds, imidazole compounds, and benzimidazole compounds, as well as phosphorus compounds and nitrite compounds. Among these, azoles are preferred, and benzotriazole compounds are particularly preferred, from the viewpoint of favorable segregation on the surface of the adhesive layer and superior migration prevention effect. The rust inhibitor (B) may be used alone or in combination of two or more kinds.

[0054] Examples of benzotriazole compounds include 1H-benzotriazole, 1H-tolyltriazole, 1-[N,N-bis(2-ethylhexyl)aminomethyl]benzotriazole, 1-[N,N-bis(2-ethylhexyl)aminomethyl]methylbenzotriazole, carboxybenzotriazole, 2,2'-[[(methyl-1H-benzotriazol-1-yl)methyl]imino]bisethanol, etc. Among them, 1H-benzotriazole, 1H-tolyltriazole, 1-[N,N-bis(2-ethylhexyl)aminomethyl]benzotriazole and 1-[N,N-bis(2-ethylhexyl)aminomethyl]methylbenzotriazole are preferred, and 1-[N,N-bis(2-ethylhexyl)aminomethyl]methylbenzotriazole is particularly preferred. This makes it possible to more effectively suppress the occurrence of migration.

[0055] The content of the rust inhibitor (B) in the adhesive composition P is preferably 0.001 parts by mass or more, more preferably 0.002 parts by mass or more, particularly preferably 0.006 parts by mass or more, further preferably 0.008 parts by mass or more, and most preferably 0.01 parts by mass or more, relative to 100 parts by mass of the (meth)acrylic acid ester polymer (A). This makes it easier for the rust inhibitor (B) to be appropriately segregated on the surface layer of the resulting adhesive layer, resulting in a more excellent migration prevention effect.

[0056] In addition, the content of the rust inhibitor (B) in the adhesive composition P is preferably 1 part by mass or less, more preferably 0.5 parts by mass or less, relative to 100 parts by mass of the (meth)acrylic acid ester polymer (A), and from the viewpoint of suppressing the change in the resistance value, it is particularly preferably 0.1 parts by mass or less, more preferably 0.06 parts by mass or less, and most preferably 0.02 parts by mass or less. By having the above content of the rust inhibitor (B), in combination with the above-mentioned coverage, it becomes easier to exhibit an excellent migration prevention effect. In addition, since the difference between the concentration of the rust inhibitor (B) in the adhesive on the upper part of the wiring and the concentration of the rust inhibitor (B) in the adhesive between the wiring is suppressed from becoming extremely large, as a result, the concentration of the rust inhibitor (B) in the vicinity of the wiring can be made uniform. This makes it possible to exhibit a good migration prevention effect. In addition, good adhesion is maintained. Furthermore, since the absolute amount of the rust inhibitor (B) contained in the adhesive layer can be suppressed, the color change of the wiring caused by the rust inhibitor (B) can be suppressed.

[0057] When the content of the rust inhibitor (B) in the adhesive constituting the adhesive layer in the display according to this embodiment is α mass % and the thickness of the adhesive layer is Z μm, it is preferable that the values ​​satisfy the following formula. 0.5<α×Z≦100 By the value of α×Z being within the above range, in combination with the above-mentioned coverage, it becomes easier to exhibit an excellent migration prevention effect. In addition, even in the case of wiring that is finer and has a narrower pitch, the rust inhibitor is continuously supplied from the adhesive on the top of the wiring to the adhesive between the wiring, making it easier to maintain the concentration of the rust inhibitor near the wiring uniform. This makes it possible to exhibit a more excellent migration prevention effect, while maintaining the coating formed by the rust inhibitor over time, thereby suppressing color changes in the wiring and the adhesive layer. In addition, the thickness of the adhesive layer 11 in this specification is a value measured in accordance with JIS K7130.

[0058] From the above viewpoints, the lower limit of α×Z is preferably 0.6 or more, more preferably 0.7 or more, and even more preferably 0.75 or more. The upper limit of α×Z is preferably 50 or less, and even more preferably 25 or less, and from the viewpoints of suppressing resistance value change and suppressing color change of the wiring, it is preferably 20 or less, more preferably 10 or less, and even more preferably 5 or less, even more preferably 3 or less, and most preferably 2.5 or less.

[0059] The content of the rust inhibitor (B) in the adhesive constituting the adhesive layer in the display according to the present embodiment is preferably 0.001% by mass or more, more preferably 0.002% by mass or more, particularly preferably 0.005% by mass or more, further preferably 0.008% by mass or more, and most preferably 0.009% by mass or more. This makes it easier for the rust inhibitor (B) to be appropriately segregated on the surface layer of the resulting adhesive layer, resulting in a more excellent migration prevention effect.

[0060] In addition, the content of the rust inhibitor (B) in the above-mentioned adhesive is preferably 1% by mass or less, more preferably 0.5% by mass or less, particularly preferably 0.1% by mass or less, further preferably 0.06% by mass or less, and most preferably 0.02% by mass or less. This, in combination with the above-mentioned coverage, makes it easier to exhibit an excellent migration prevention effect. In addition, since the difference between the rust inhibitor (B) concentration of the adhesive on the upper part of the wiring and the rust inhibitor (B) concentration of the adhesive between the wiring is suppressed from becoming extremely large, as a result, the concentration of the rust inhibitor (B) near the wiring can be made uniform. This makes it possible to exhibit a good migration prevention effect. In addition, good adhesion is maintained. Furthermore, since the absolute amount of the rust inhibitor (B) contained in the adhesive layer can be suppressed, the color change of the wiring caused by the rust inhibitor (B) can be suppressed.

[0061] (1-3) Crosslinking agent (C) The pressure-sensitive adhesive composition P preferably contains a crosslinking agent (C). By containing the crosslinking agent (C), the pressure-sensitive adhesive composition P can crosslink the (meth)acrylic acid ester polymer (A) to form a three-dimensional network structure, thereby improving the cohesive strength of the resulting pressure-sensitive adhesive and improving its durability.

[0062] The crosslinking agent (C) may be any that reacts with the reactive group of the (meth)acrylic acid ester polymer (A), and may be, for example, an isocyanate-based crosslinking agent, an epoxy-based crosslinking agent, an amine-based crosslinking agent, a melamine-based crosslinking agent, an aziridine-based crosslinking agent, a hydrazine-based crosslinking agent, an aldehyde-based crosslinking agent, an oxazoline-based crosslinking agent, a metal alkoxide-based crosslinking agent, a metal chelate-based crosslinking agent, a metal salt-based crosslinking agent, or an ammonium salt-based crosslinking agent. When the (meth)acrylic acid ester polymer (A) contains a hydroxyl-containing monomer as a monomer unit constituting the polymer, it is preferable to use an isocyanate-based crosslinking agent that has excellent reactivity with the hydroxyl group. The crosslinking agent (C) may be used alone or in combination of two or more.

[0063] The isocyanate-based crosslinking agent contains at least a polyisocyanate compound. Examples of the polyisocyanate compound include aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, and xylylene diisocyanate, aliphatic polyisocyanates such as hexamethylene diisocyanate, alicyclic polyisocyanates such as isophorone diisocyanate and hydrogenated diphenylmethane diisocyanate, and their biuret and isocyanurate forms, as well as adducts which are reactants with low-molecular active hydrogen-containing compounds such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, and castor oil. Among these, trimethylolpropane-modified aromatic polyisocyanates, particularly trimethylolpropane-modified tolylene diisocyanate, are preferred from the viewpoint of reactivity with hydroxyl groups.

[0064] The content of the crosslinking agent (C) in the adhesive composition P is preferably 0.001 parts by mass or more, more preferably 0.1 parts by mass or more, particularly preferably 0.2 parts by mass or more, and even more preferably 0.25 parts by mass or more, relative to 100 parts by mass of the (meth)acrylic acid ester polymer (A). The content is preferably 10 parts by mass or less, more preferably 1 part by mass or less, particularly preferably 0.6 parts by mass or less, and from the viewpoint of suppressing resistance value change, it is even more preferably 0.4 parts by mass or less. By having the content of the crosslinking agent (C) in the above range, the cohesive force of the obtained adhesive becomes favorable, and an adhesive with better adhesion is obtained.

[0065] (1-4) Silane compounds (D) The adhesive composition P preferably contains a silane compound (D). By containing the silane compound (D), the adhesive composition P has a more excellent migration prevention effect.

[0066] The silane compound (D) is preferably an organosilicon compound having at least one alkoxysilyl group. This improves the adhesion of the resulting adhesive layer to the display component, which is the adherend, and the adhesive strength becomes more favorable. In addition, the action of the alkoxysilyl group is thought to suppress the infiltration of moisture into the electrode adjacent to the resulting adhesive layer, thereby providing a more excellent migration prevention effect.

[0067] The organosilicon compound having at least one alkoxysilyl group as the silane compound (D) may be, for example, a silane coupling agent. Specific examples thereof include polymerizable unsaturated group-containing silicon compounds such as vinyltrimethoxysilane, vinyltriethoxysilane, and methacryloxypropyltrimethoxysilane; silicon compounds having an epoxy structure such as 3-glycidoxypropyltrimethoxysilane and 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane; 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, and 3-mercaptopropyldimethylsilane; Examples of the mercapto group-containing silicon compounds include 3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, and N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane; 3-chloropropyltrimethoxysilane, 3-isocyanatepropyltriethoxysilane, or condensates of at least one of these with alkyl group-containing silicon compounds such as methyltriethoxysilane, ethyltriethoxysilane, methyltrimethoxysilane, and ethyltrimethoxysilane. These may be used alone or in combination of two or more. Among them, silicon compounds having an epoxy structure are preferred from the viewpoint of migration prevention effect and adhesion, and 3-glycidyloxypropyltrimethoxysilane is particularly preferred.

[0068] The silane compound (D) may be an organosilicon compound having alkoxysilyl groups at both ends, preferably a compound represented by the following general formula (I): [ka] (R in the formula 1 R is a divalent hydrocarbon group which may have a nitrogen atom. 2 ~R 7 are each independently an alkyl group.

[0069] From the viewpoint of migration prevention effect, the above R 1 The carbon number of the divalent hydrocarbon group is preferably 1 to 10, particularly preferably 3 to 8, and more preferably 5 to 7. The hydrocarbon group is preferably a saturated hydrocarbon group, and more preferably a chain saturated hydrocarbon group. The hydrocarbon group preferably contains an alkylene group, and more preferably is an alkylene group. The carbon number of the alkylene group is preferably 1 to 10, particularly preferably 3 to 8, and more preferably 5 to 7.

[0070] Above R 1 When R has a nitrogen atom, the nitrogen atom may be present in a side chain of the hydrocarbon group, but is preferably present in the main chain of the hydrocarbon group. 1 When has a nitrogen atom, R 1 The number of nitrogen atoms contained therein is preferably 1 to 5, and particularly preferably 2 to 3. The nitrogen atom is preferably an amino group or an amide group, and particularly preferably an amino group, and further preferably exists in the main chain of the hydrocarbon group as a secondary amine or tertiary amine.

[0071] Above R 1 When has a nitrogen atom, R 1 is -(CH) m It is preferred that the skeleton of the group -NH- is included, and -(CH) m -NH-(CH) n More preferably, it contains a - skeleton, in particular, -(CH) m -NH-(CH) nIt is preferred that the skeleton of the group -NH- is contained, and more preferably -(CH) m -NH-(CH) n -NH-(CH) p The above m, n and p are positive integers, preferably 1 to 5, and particularly preferably 2 to 4.

[0072] Above R 1 It is preferable that the adhesive does not have a sulfur atom in the main chain. If the adhesive has a sulfur atom in the main chain, metal sulfides are likely to be generated at the interface between the adhesive and wiring made of metal (particularly silver) or metal oxide (particularly ITO) in a durability test environment. This may hinder the migration prevention effect described above.

[0073] Above R 2 ~R 7 The number of carbon atoms in the alkyl group of R is preferably 1 to 6, more preferably 1 to 3, and further preferably 1 or 2. 2 ~R 7 Preferably, all of are the same alkyl group, and most preferably, all are methyl groups.

[0074] The content of the silane compound (D) in the adhesive composition P is preferably 0.01 parts by mass or more as a lower limit, more preferably 0.1 parts by mass or more, particularly preferably 0.16 parts by mass or more, and even more preferably 0.22 parts by mass or more, relative to 100 parts by mass of the (meth)acrylic acid ester polymer (A). The content is preferably 2 parts by mass or less as an upper limit, particularly preferably 1 part by mass or less, and even more preferably 0.5 parts by mass or less. By having the content of the silane compound (D) in the above range, the action of the silane compound (D) is effectively exerted, and the migration prevention effect is more excellent.

[0075] (1-5) Active energy ray-curable component (E) When the adhesive obtained from the adhesive composition P is an active energy ray curable adhesive, the adhesive composition P preferably contains an active energy ray curable component (E). By containing the active energy ray curable component (E) in the adhesive composition P, the adhesive obtained by crosslinking (thermal crosslinking) the adhesive composition P becomes an active energy ray curable adhesive. In this active energy ray curable adhesive, it is presumed that the active energy ray curable components (E) polymerize with each other by curing by irradiation with active energy rays after attachment to an adherend, and the polymerized active energy ray curable components (E) are entangled with the crosslinked structure (three-dimensional network structure) of the (meth)acrylic acid ester polymer (A). An adhesive having such a high-order structure has high cohesive force and shows high coating strength, and is therefore more durable.

[0076] The active energy ray curable component (E) is not particularly limited as long as it is a component that is cured by irradiation with active energy rays and can obtain the above-mentioned effects, and may be any of a monomer, an oligomer, or a polymer, or a mixture thereof. Among them, a polyfunctional acrylate monomer that can obtain a pressure-sensitive adhesive having excellent durability can be preferably mentioned.

[0077] Examples of polyfunctional acrylate monomers include bifunctional monomers such as 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, neopentyl glycol adipate di(meth)acrylate, hydroxypivalic acid neopentyl glycol di(meth)acrylate, dicyclopentanyl di(meth)acrylate, caprolactone-modified dicyclopentenyl di(meth)acrylate, ethylene oxide-modified phosphoric acid di(meth)acrylate, di(acryloxyethyl)isocyanurate, allylated cyclohexyl di(meth)acrylate, ethoxylated bisphenol A diacrylate, and 9,9-bis[4-(2-acryloyloxyethoxy)phenyl]fluorene; trifunctional types such as diglycerol tetra(meth)acrylate and pentaerythritol tetra(meth)acrylate; pentafunctional types such as propionic acid modified dipentaerythritol tri(meth)acrylate; and hexafunctional types such as dipentaerythritol hexa(meth)acrylate and caprolactone modified dipentaerythritol hexa(meth)acrylate.Among the above, from the viewpoint of imparting suitable cohesive strength and adhesiveness to the obtained pressure-sensitive adhesive and effectively suppressing the occurrence of defects such as lifting and peeling at the interface with the adherend, polyfunctional acrylate monomers containing an isocyanurate structure in the molecule, such as di(acryloxyethyl)isocyanurate, tris(acryloxyethyl)isocyanurate, and ε-caprolactone-modified tris-(2-(meth)acryloxyethyl)isocyanurate, are preferred, polyfunctional acrylate monomers having three or more functions and containing an isocyanurate structure in the molecule are more preferred, and ε-caprolactone-modified tris-(2-(meth)acryloxyethyl)isocyanurate is particularly preferred. These may be used alone or in combination of two or more. In addition, from the viewpoint of compatibility with the (meth)acrylic acid ester polymer (A), the polyfunctional acrylate monomer is preferably one having a molecular weight of less than 1000.

[0078] The active energy ray curable component (E) may be an active energy ray curable acrylate oligomer. Examples of such acrylate oligomers include polyester acrylates, epoxy acrylates, urethane acrylates, polyether acrylates, polybutadiene acrylates, and silicone acrylates.

[0079] The weight average molecular weight of the acrylate oligomer is preferably 50,000 or less, more preferably 1,000 to 50,000, and even more preferably 3,000 to 40,000.

[0080] Also, as the active energy ray curable component (E), an adduct acrylate polymer having a group having a (meth)acryloyl group introduced into the side chain can be used. Such an adduct acrylate polymer can be obtained by using a copolymer of a (meth)acrylic acid ester and a monomer having a crosslinkable functional group in the molecule, and reacting a compound having a group reactive with the (meth)acryloyl group and the crosslinkable functional group with a part of the crosslinkable functional group of the copolymer.

[0081] The weight average molecular weight of the adduct acrylate polymer is preferably about 50,000 to 900,000, and particularly preferably about 100,000 to 500,000.

[0082] The active energy ray-curable component (E) may be one selected from the above-mentioned polyfunctional acrylate monomers, acrylate oligomers, and adduct acrylate polymers, or two or more may be combined to be used, or may be combined with other active energy ray-curable components.

[0083] When the adhesive composition P contains an active energy ray curable component (E), the content of the active energy ray curable component (E) is preferably 2 parts by mass or more, and particularly preferably 4 parts by mass or more, relative to 100 parts by mass of the (meth)acrylic acid ester polymer (A). The content is preferably 20 parts by mass or less, more preferably 10 parts by mass or less, and particularly preferably 6 parts by mass or less. When the content of the active energy ray curable component (E) is within the above range, the cohesive strength and adhesive strength of the adhesive after curing with active energy rays are improved, and durability is further improved.

[0084] (1-6) Photopolymerization initiator (F) In the case where the adhesive obtained from the adhesive composition P is used as an active energy ray-curable adhesive, and ultraviolet rays are used as the active energy rays, it is preferable that the adhesive composition P further contains a photopolymerization initiator (F). By containing the photopolymerization initiator (F), the active energy ray-curable component (E) can be polymerized efficiently, and the polymerization curing time and the irradiation dose of the active energy rays can be reduced.

[0085] Examples of such photopolymerization initiators (F) include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholino-propan-1-one, 4-(2-hydroxyethoxy)phenyl-2-(hydroxy-2-propyl)ketone, benzof Examples of the benzoxanthone include phenone, p-phenylbenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2-tertiary-butylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyl dimethyl ketal, acetophenone dimethyl ketal, p-dimethylaminobenzoic acid ester, oligo[2-hydroxy-2-methyl-1[4-(1-methylvinyl)phenyl]propanone], 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide, etc. These may be used alone or in combination of two or more.

[0086] When the adhesive composition P contains an active energy ray curable component (E) and a photopolymerization initiator (F), the content of the photopolymerization initiator (F) is preferably 1 part by mass or more as a lower limit, and more preferably 5 parts by mass or more, per 100 parts by mass of the active energy ray curable component (E). The content is preferably 30 parts by mass or less as an upper limit, and particularly preferably 15 parts by mass or less. When the content of the photopolymerization initiator (F) is within the above range, the cohesive strength and adhesive strength of the adhesive after curing with active energy rays are improved, and durability is further improved.

[0087] (1-7) Various additives If desired, various additives that are commonly used in acrylic adhesives, such as an ultraviolet absorber, an antistatic agent, a tackifier, an antioxidant, a light stabilizer, a softener, a filler, a refractive index adjuster, etc., can be added to the adhesive composition P. Note that polymerization solvents and dilution solvents described below are not included in the additives that constitute the adhesive composition P.

[0088] Examples of the ultraviolet absorbent include compounds such as benzophenone-based, benzotriazole-based, benzoate-based, benzoxazinone-based, triazine-based, phenyl salicylate-based, cyanoacrylate-based, and nickel complex salt-based compounds. Among these, it is preferable to use at least one of a benzophenone-based compound, a benzotriazole-based compound, and a triazine-based compound.

[0089] Examples of the benzophenone compounds include 2,2-dihydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid hydrate, and 2-hydroxy-4-n-octyloxybenzophenone.

[0090] Examples of the benzotriazole-based compounds include 2-(2-hydroxy-5-t-butylphenyl)-2H-benzotriazole, octyl-3-[3-t-butyl-4-hydroxy-5-(5-chloro-2H-benzotriazol-2-yl)phenyl]propionate, 2-ethylhexyl-3-[3-t-butyl-4-hydroxy-5-(5-chloro-2H-benzotriazol-2-yl)phenyl]propionate, and 3-(2H-benzotriazol-2-yl)-5-(1,1-dimethylethyl)-4-hydroxy-benzenepropanoic acid.

[0091] Examples of the triazine-based compound include 2,4-bis[2-hydroxy-4-butoxyphenyl]-6-(2,4-dibutoxyphenyl)-1,3-5-triazine, 2-[4,6-di(2,4-xylyl)-1,3,5-triazin-2-yl]-5-octyloxyphenol, and the like.

[0092] The above ultraviolet absorbents may be used alone or in combination of two or more.

[0093] When the adhesive composition P contains an ultraviolet absorber, the content of the ultraviolet absorber is preferably 0.1 parts by mass or more, particularly preferably 0.8 parts by mass or more, relative to 100 parts by mass of the (meth)acrylic acid ester polymer (A). The content is preferably 15 parts by mass or less, particularly preferably 8 parts by mass or less, and further preferably 2 parts by mass or less. When the content of the ultraviolet absorber is within the above range, the adhesive layer is likely to exhibit good ultraviolet absorption properties.

[0094] In addition, the adhesive composition P represents a mixture of various components remaining in the adhesive layer, either as is or after reacting, and components removed during a drying process or the like, such as the polymerization solvent and dilution solvent described below, are not included in the adhesive composition P.

[0095] (2) Production of adhesive composition The adhesive composition P can be produced by producing a (meth)acrylic acid ester polymer (A), mixing the resulting (meth)acrylic acid ester polymer (A) with a rust inhibitor (B), and, if desired, adding a crosslinking agent (C), a silane compound (D), an active energy ray-curable component (E), a photopolymerization initiator (F), additives, etc.

[0096] The (meth)acrylic acid ester polymer (A) can be produced by polymerizing a mixture of monomer units constituting the polymer by a normal radical polymerization method. The polymerization of the (meth)acrylic acid ester polymer (A) can be carried out by a solution polymerization method or the like, using a polymerization initiator as desired. Examples of the polymerization solvent include ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone, etc., and two or more of them may be used in combination.

[0097] Examples of the polymerization initiator include azo compounds and organic peroxides, and two or more of them may be used in combination. Examples of the azo compounds include 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-methylbutyronitrile), 1,1'-azobis(cyclohexane 1-carbonitrile), 2,2'-azobis(2,4-dimethylvaleronitrile), 2,2'-azobis(2,4-dimethyl-4-methoxyvaleronitrile), dimethyl 2,2'-azobis(2-methylpropionate), 4,4'-azobis(4-cyanovaleric acid), 2,2'-azobis(2-hydroxymethylpropionitrile), and 2,2'-azobis[2-(2-imidazolin-2-yl)propane].

[0098] Examples of organic peroxides include benzoyl peroxide, t-butyl perbenzoate, cumene hydroperoxide, diisopropyl peroxydicarbonate, di-n-propyl peroxydicarbonate, di(2-ethoxyethyl)peroxydicarbonate, t-butyl peroxyneodecanoate, t-butyl peroxypivalate, (3,5,5-trimethylhexanoyl)peroxide, dipropionyl peroxide, and diacetyl peroxide.

[0099] In the above polymerization step, the weight average molecular weight of the resulting polymer can be adjusted by adding a chain transfer agent such as 2-mercaptoethanol.

[0100] Once the (meth)acrylic acid ester polymer (A) is obtained, an anti-rust agent (B), a crosslinking agent (C), a silane compound (D), an active energy ray curable component (E), a photopolymerization initiator (F), additives, a dilution solvent, etc. can be added to a solution of the (meth)acrylic acid ester polymer (A) and thoroughly mixed to obtain an adhesive composition P (coating solution) diluted with a solvent.

[0101] Examples of the dilution solvent include aliphatic hydrocarbons such as hexane, heptane, and cyclohexane; aromatic hydrocarbons such as toluene and xylene; halogenated hydrocarbons such as methylene chloride and ethylene chloride; alcohols such as methanol, ethanol, propanol, butanol, and 1-methoxy-2-propanol; ketones such as acetone, methyl ethyl ketone, 2-pentanone, isophorone, and cyclohexanone; esters such as ethyl acetate and butyl acetate; and cellosolve-based solvents such as ethyl cellosolve.

[0102] The concentration and viscosity of the coating solution thus prepared are not particularly limited as long as they are within the range that allows coating, and can be appropriately selected according to the situation. For example, the adhesive composition P is diluted so that the concentration becomes 10 to 40 mass %. In addition, when obtaining the coating solution, the addition of a dilution solvent or the like is not a necessary condition, and if the adhesive composition P has a viscosity that allows coating, it is not necessary to add a dilution solvent. In this case, the adhesive composition P becomes a coating solution in which the polymerization solvent of the (meth)acrylic acid ester polymer (A) itself serves as the dilution solvent.

[0103] (3) Formation of adhesive layer The adhesive layer in the display according to this embodiment is preferably made of an adhesive obtained by crosslinking the above-mentioned adhesive composition P (coating layer). The crosslinking of the adhesive composition P can be carried out by a heat treatment. This heat treatment can also serve as a drying treatment for volatilizing the dilution solvent of the coated adhesive composition P.

[0104] When heat treatment is performed, the heating temperature is preferably 50 to 150° C., and more preferably 70 to 120° C. The heating time is preferably 30 seconds to 10 minutes, and more preferably 50 seconds to 2 minutes. After the heat treatment, a curing period of about 1 to 2 weeks may be provided at room temperature (e.g., 23° C., 50% RH) as necessary. If this curing period is required, the pressure-sensitive adhesive layer is formed after the curing period has elapsed, and if no curing period is required, the pressure-sensitive adhesive layer is formed after the heat treatment is completed.

[0105] (4) Physical properties of adhesive (gel fraction) The gel fraction of the adhesive constituting the adhesive layer in the display according to the present embodiment is preferably 30% or more as a lower limit, particularly preferably 40% or more, and more preferably 45% or more. When the lower limit of the gel fraction of the adhesive is as above, the cohesive force is improved and the durability is higher. In addition, the upper limit of the gel fraction is preferably 90% or less, more preferably 80% or less, and particularly preferably 75% or less, and from the viewpoint of further increasing the adhesive strength, it is preferably 65% ​​or less, and more preferably 55% or less. When the upper limit of the gel fraction of the adhesive is as above, the adhesive does not become too hard and the adhesive strength is higher. In addition, the rust inhibitor (B) is easily segregated to the surface layer of the adhesive layer. The method for measuring the gel fraction of the adhesive is as shown in the test example described later.

[0106] (5) Thickness of adhesive layer The lower limit of the thickness of the adhesive layer 11 (measured according to JIS K7130) is preferably 1 μm or more, more preferably 5 μm or more, particularly preferably 10 μm or more, and even more preferably 20 μm or more. By setting the lower limit of the thickness of the adhesive layer 11 as above, the coverage is easily within the above-mentioned range. In addition, even in the case of wiring that is finely divided and has a narrow pitch, the rust inhibitor (B) is continuously supplied from the adhesive on the upper part of the wiring to the adhesive between the wiring, so that the concentration of the rust inhibitor (B) near the wiring can be easily maintained uniformly. This allows a more excellent migration prevention effect to be exhibited, and the coating formed by the rust inhibitor (B) is maintained over time, so that color changes in the wiring and the adhesive layer can be suppressed. In addition, by setting the lower limit of the thickness of the adhesive layer 11 as above, excellent adhesive strength is fully exhibited.

[0107] Moreover, the upper limit of the thickness of the adhesive layer 11 is preferably 200 μm or less, more preferably 100 μm or less, and particularly preferably 80 μm or less. By setting the upper limit of the thickness of the adhesive layer 11 as described above, the degree of coverage is likely to fall within the above-mentioned range. In addition, the absolute amount of the rust inhibitor (B) contained in the adhesive layer 11 can be reduced, so that the color change of the wiring caused by the rust inhibitor (B) can be suppressed. Furthermore, the processability of the adhesive sheet 1 is improved. In terms of being able to obtain a thinner display while exhibiting an excellent migration effect while making it easy for the degree of coverage to fall within the above-mentioned range, the upper limit of the thickness of the adhesive layer 11 is preferably 60 μm or less, and more preferably 30 μm or less. The adhesive layer 11 may be formed as a single layer, or may be formed by laminating multiple layers.

[0108] 1-2.Release sheet The release sheets 12a and 12b are not particularly limited, and known plastic films can be used. For example, polyethylene films, polypropylene films, polybutene films, polybutadiene films, polymethylpentene films, polyvinyl chloride films, vinyl chloride copolymer films, polyethylene terephthalate films, polyethylene naphthalate films, polybutylene terephthalate films, polyurethane films, ethylene vinyl acetate films, ionomer resin films, ethylene-(meth)acrylic acid copolymer films, ethylene-(meth)acrylic acid ester copolymer films, polystyrene films, polycarbonate films, polyimide films, fluororesin films, etc. can be used. Crosslinked films of these can also be used. Furthermore, laminated films of these can also be used.

[0109] The release surfaces of the release sheets 12a and 12b (particularly the surfaces in contact with the adhesive layer 11) are preferably subjected to a release treatment. Examples of release agents used in the release treatment include alkyd-based, silicone-based, fluorine-based, unsaturated polyester-based, polyolefin-based, and wax-based release agents. It is preferable that one of the release sheets 12a and 12b is a heavy release type release sheet having a large release strength, and the other is a light release type release sheet having a small release strength.

[0110] There is no particular limitation on the thickness of the release sheets 12a and 12b, but it is usually about 20 to 150 μm.

[0111] 2. Manufacturing of adhesive sheets In one example of manufacturing the adhesive sheet 1, a coating solution of the adhesive composition P is applied to the release surface of one release sheet 12a (or 12b), a heat treatment is carried out to crosslink the adhesive composition P, and a coating layer is formed, and then the release surface of the other release sheet 12b (or 12a) is superimposed on the coating layer. If a curing period is required, a curing period is left, and if no curing period is required, the coating layer becomes the adhesive layer 11 as is. In this way, the adhesive sheet 1 is obtained. The conditions for the heat treatment and curing are as described above.

[0112] In another manufacturing example of the adhesive sheet 1, the coating liquid of the adhesive composition P is applied to the release surface of one release sheet 12a, and the adhesive composition P is crosslinked by heat treatment to form a coating layer, thereby obtaining the release sheet 12a with the coating layer. The coating liquid of the adhesive composition P is applied to the release surface of the other release sheet 12b, and the adhesive composition P is crosslinked by heat treatment to form a coating layer, thereby obtaining the release sheet 12b with the coating layer. Then, the release sheet 12a with the coating layer and the release sheet 12b with the coating layer are bonded together so that both coating layers are in contact with each other. If a curing period is required, a curing period is provided, and if no curing period is required, the laminated coating layer becomes the adhesive layer 11 as it is. This results in the adhesive sheet 1. According to this manufacturing example, even if the adhesive layer 11 is thick, it can be manufactured stably.

[0113] The coating solution of the pressure-sensitive adhesive composition P can be applied by, for example, bar coating, knife coating, roll coating, blade coating, die coating, gravure coating, or the like.

[0114] 3. Physical properties of adhesive sheets 3-1. Adhesive strength The adhesive strength of the adhesive sheet 1 capable of manufacturing the display according to the present embodiment to soda lime glass is preferably 10N / 25mm or more as a lower limit, particularly preferably 15N / 25mm or more, and more preferably 20N / 25mm or more. When the lower limit of the adhesive strength is as above, the durability of the adhesive layer 11 becomes more excellent. In addition, the upper limit of the adhesive strength is preferably 100N / 25mm or less, more preferably 75N / 25mm or less, particularly preferably 50N / 25mm or less, further preferably 35N / 25mm or less, and most preferably 25N / 25mm or less. When the upper limit of the adhesive strength is as above, the adhesive sheet effectively exhibits the migration suppression effect, the color change suppression effect, and the resistance value change suppression effect, while obtaining good reworkability, and is capable of being re-applied even if an application error occurs.

[0115] The above adhesive strength basically refers to the adhesive strength measured by the 180-degree peeling method in accordance with JIS Z0237:2009. The measurement sample is 25 mm wide and 100 mm long, and the measurement sample is attached to the adherend and pressurized at 0.5 MPa and 50°C for 20 minutes, and then left to stand for 24 hours under conditions of normal pressure, 23°C, and 50% RH, and then measured at a peeling speed of 300 mm / min.

[0116] 3-2.Haze value The haze value of the adhesive layer 11 of the adhesive sheet 1 is preferably 1% or less, more preferably 0.5% or less, particularly preferably 0.3% or less, and even more preferably 0.2% or less. The above haze value of the adhesive layer 11 provides excellent light transmission and is suitable for use in displays. The lower limit of the haze value is not particularly limited, and is preferably 0% or more, and more preferably 0.01% or more.

[0117] The haze value is a characteristic value including the thickness of the pressure-sensitive adhesive layer, and it is preferable that the haze value is satisfied regardless of the thickness of the pressure-sensitive adhesive layer. Here, the haze value in this specification is a value measured in accordance with JIS K7136:2000.

[0118] 3-3.Total light transmittance The total light transmittance of the adhesive layer 11 of the adhesive sheet 1 is preferably 70% or more, more preferably 80% or more, particularly preferably 90% or more, further preferably 95% or more, and most preferably 99% or more. When the total light transmittance of the adhesive layer 11 is within the above range, the adhesive layer 11 has excellent light transmittance and is suitable for use in displays. The upper limit of the total light transmittance is usually 100%. The total light transmittance in this specification is a value measured in accordance with JIS K7361-1:1997.

[0119] 3-4.CIE1976L*a*b* color system The adhesive layer 11 of the adhesive sheet 1 preferably has an absolute value of chromaticity a* defined by the CIE1976L*a*b* color system of 0 or more, particularly preferably 0.1 or more. The absolute value of the chromaticity a* is preferably 0.8 or less, particularly preferably 0.6 or less, and more preferably 0.4 or less. The absolute value of the chromaticity b* of the adhesive layer 11 is preferably 0 or more, particularly preferably 0.1 or more. The absolute value of the chromaticity b* is preferably 0.8 or less, particularly preferably 0.6 or less, and more preferably 0.4 or less. As a result, the adhesive layer 11 has a color suitable for display. The method for measuring the chromaticity a* and b* in this specification is as shown in the test examples described later.

[0120] [Display body] The display according to this embodiment includes a first display member, a second display member, and an adhesive layer that bonds the first display member and the second display member to each other. The adhesive layer must be made of an adhesive containing a rust inhibitor, and is preferably made of an adhesive obtained from the adhesive composition P described above. Here, the first display member and / or the second display member have wiring made of metal or metal oxide at least on the surface to be bonded (the adhesive layer side). In a preferred configuration, the second display member has the wiring at least on the surface to be bonded.

[0121] Examples of the display include a liquid crystal (LCD) display, a light emitting diode (LED) display, an organic electroluminescence (organic EL) display, electronic paper, etc., and may also be a touch panel. The display may also be a member constituting a part of these.

[0122] The first display member and the second display member may both be rigid and hard. The adhesive layer obtained from the adhesive composition P described above allows the first display member, which is a hard body, and the second display member, which is a hard body, to be bonded together without any problems.

[0123] The first display member is preferably a protective panel made of a glass plate, a plastic plate, or a laminate containing them. The first display member may have a step on the surface on the adhesive layer side. In this case, specifically, it is preferable that the step is caused by a printing layer. This printing layer is generally formed in a frame shape.

[0124] The glass plate is not particularly limited, and examples thereof include chemically strengthened glass, alkali-free glass, quartz glass, soda-lime glass, barium-strontium-containing glass, aluminosilicate glass, lead glass, borosilicate glass, barium borosilicate glass, etc. The thickness of the glass plate is not particularly limited, but is usually 0.1 to 5 mm, and preferably 0.2 to 2 mm.

[0125] The plastic plate is not particularly limited, and examples thereof include an acrylic plate, a polycarbonate plate, etc. The thickness of the plastic plate is not particularly limited, but is usually 0.2 to 5 mm, and preferably 0.4 to 3 mm.

[0126] In addition, various functional layers (electrode layer, silica layer, hard coat layer, anti-glare layer, etc.) may be provided on one or both sides of the above-mentioned glass plate or plastic plate, and optical members may be laminated thereon.

[0127] The material constituting the printing layer is not particularly limited, and known materials for printing are used. The lower limit of the thickness of the printing layer, i.e., the height of the step, is preferably 3 μm or more, more preferably 5 μm or more, particularly preferably 7 μm or more, and most preferably 10 μm or more. By setting the lower limit above, it is possible to sufficiently ensure concealment, such as making the electrical wiring invisible from the viewer side. In addition, the upper limit is preferably 50 μm or less, more preferably 35 μm or less, particularly preferably 25 μm or less, and even more preferably 20 μm or less. By setting the upper limit below the above, it is possible to prevent the step-following ability of the pressure-sensitive adhesive layer relative to the printing layer from deteriorating.

[0128] The second display component is an optical member to which the first display component is to be attached, a display module (e.g., a liquid crystal (LCD) module, a light emitting diode (LED) module, an organic electroluminescence (OLED) module, etc.), an optical member as part of a display module, or a laminate including a display module, and preferably has wiring made of metal or metal oxide on at least the surface facing the adhesive layer.

[0129] Examples of the optical member include a film sensor, an electrode film, a metal nanowire film, and a wire grid polarizing film.

[0130] Examples of wiring made of metal include wiring made of silver, silver alloy, copper, copper alloy, etc. (including mesh-shaped, grid-shaped, and nanowire-shaped wiring). In particular, preferred examples include those constituting electrodes of touch panels, specifically, those contained in film sensors. Among the above-mentioned wiring made of metal, wiring made of nanoparticles of silver or silver alloy is preferred, and as the silver alloy, particularly preferred is silver alloy metal wiring in which palladium and copper are added to silver. Although non-oxidized metals have a higher tendency to ionize than metal oxides such as ITO, according to the display according to the present embodiment, even in such cases, disconnection or short circuit of the wiring is effectively prevented.

[0131] Examples of wiring made of metal oxide include patterned transparent conductive films made of metal oxides such as tin-doped indium oxide (ITO) and zinc oxide. Among the above, patterned transparent conductive films made of ITO are particularly preferred, as the ITO transparent conductive film is likely to exhibit an excellent migration prevention effect.

[0132] The wiring width of the metal or metal oxide is preferably 50 μm or less, more preferably 30 μm or less. The wiring width is preferably 1 μm or more, more preferably 4 μm or more, particularly preferably 8 μm or more, and even more preferably 10 μm or more. When the wiring width is in the above range, it contributes to the fineness and narrowing of the electrodes while making the coverage more likely to fall within the above range, so that a more excellent migration prevention effect can be exhibited. This can contribute to improving the connection reliability of the electrodes. From the viewpoint of obtaining a display having finer and narrower-pitched wiring while making the coverage fall within the above range, it is particularly preferably 20 μm or less, and even more preferably 12 μm or less.

[0133] The distance of the gap between the wirings made of the metal or the metal oxide (distance between wirings) is preferably 50 μm or less, more preferably 30 μm or less. The distance between wirings is preferably 1 μm or more, more preferably 4 μm or more, particularly preferably 8 μm or more, and even more preferably 10 μm or more. When the distance between wirings is within the above range, it contributes to the fineness and narrowing of the electrodes while making the coverage more likely to fall within the above range, so that a more excellent migration prevention effect can be exhibited. This can contribute to improving the connection reliability of the electrodes. From the viewpoint of obtaining a display having finer and narrower-pitched wiring while making the coverage fall within the above range, it is particularly preferably 20 μm or less, and even more preferably 12 μm or less.

[0134] The thickness of the wiring made of the above metal or the above metal oxide is preferably 1 μm or less, more preferably 0.6 μm or less, particularly preferably 0.3 μm or less, and even more preferably 0.2 μm or less. The thickness of the wiring is preferably 0.01 μm or more, more preferably 0.05 μm or more, particularly preferably 0.1 μm or more, and even more preferably 0.15 μm or more. When the wiring thickness is in the above range, it contributes to the thinning of the electrode while making it easier for the coverage to fall within the above range, so that a more excellent migration prevention effect can be exhibited. This can contribute to improving the connection reliability of the electrode.

[0135] As an example of the display according to this embodiment, a capacitive touch panel 2 is shown in FIG. 2. The touch panel 2 includes a display module 3, a first film sensor 5a laminated thereon via an adhesive layer 4, a second film sensor 5b laminated thereon via a first adhesive layer 11, and a cover material 6 laminated thereon via a second adhesive layer 11. A printed layer 7 is formed on the surface of the cover material 6 facing the second adhesive layer 11, and therefore a step is present depending on the presence or absence of the printed layer 7. In this embodiment, the cover material 6 corresponds to the first display member, and the second film sensor 5b corresponds to the second display member, or the second film sensor 5b corresponds to the first display member, and the first film sensor 5a corresponds to the second display member.

[0136] Considering the migration prevention effect, it is preferable that both the first adhesive layer 11 and the second adhesive layer 11 in the touch panel 2 are the adhesive layer 11 of the adhesive sheet 1. When the first adhesive layer 11 or the second adhesive layer 11 is not the adhesive layer 11 of the adhesive sheet 1, examples of the adhesive constituting the adhesive layer include acrylic adhesives, rubber adhesives, silicone adhesives, urethane adhesives, polyester adhesives, polyvinyl ether adhesives, etc., and among these, acrylic adhesives are preferred.

[0137] The adhesive layer 4 may be formed by the adhesive layer 11 of the adhesive sheet 1, or may be formed by another adhesive or adhesive sheet. In the latter case, examples of the adhesive constituting the adhesive layer 4 include acrylic adhesives, rubber adhesives, silicone adhesives, urethane adhesives, polyester adhesives, polyvinyl ether adhesives, etc., among which acrylic adhesives are preferred.

[0138] In this embodiment, the first film sensor 5a and the second film sensor 5b each include a base film 51 and an electrode 52 formed on the base film 51. The base film 51 is not particularly limited, but examples of the base film that can be used include a polyethylene terephthalate film, an acrylic film, and a polycarbonate film.

[0139] The electrodes 52 of the first film sensor 5a and / or the electrodes 52 of the second film sensor 5b are composed of wiring made of metal or metal oxide. Examples of wiring made of metal or metal oxide include those described above. Usually, one of the electrodes 52 of the first film sensor 5a and the electrodes 52 of the second film sensor 5b forms a circuit pattern in the X-axis direction, and the other forms a circuit pattern in the Y-axis direction.

[0140] In this embodiment, the electrode 52 of the second film sensor 5b is located above the second film sensor 5b in Fig. 2. On the other hand, the electrode 52 of the first film sensor 5a is located above the first film sensor 5a in Fig. 2, but is not limited to this and may be located below the first film sensor 5a.

[0141] An example of a method for manufacturing the touch panel 2 will be described below. A first adhesive sheet 1 and a second adhesive sheet 1 are prepared as the adhesive sheet 1. One release sheet 12a is peeled off from the first adhesive sheet 1, and the exposed adhesive layer 11 (first adhesive layer) is attached to the first film sensor 5a so as to contact the electrode 52 of the first film sensor 5a. Also, one release sheet 12a is peeled off from the second adhesive sheet 1, and the exposed adhesive layer 11 (second adhesive layer 11) is attached to the second film sensor 5b so as to contact the electrode 52 of the second film sensor 5b.

[0142] Then, the other release sheet 12b of the first adhesive sheet 1 is peeled off, and the two are attached together so that the exposed first adhesive layer 11 contacts the surface of the second film sensor 5b opposite to the surface on which the second adhesive layer 11 is laminated (the exposed surface of the base film 51 of the second film sensor 5b). This results in a laminate in which the release sheet 12b, the second adhesive layer 11, the second film sensor 5b, the first adhesive layer 11, and the first film sensor 5a are laminated in this order.

[0143] Next, the adhesive layer 4 provided on the release sheet is attached to the surface of the laminate on the first film sensor 5a side (the exposed surface of the base film 51 of the first film sensor 5a). Next, the release sheet 12b is peeled off from the laminate, and the cover material 6 is attached to the exposed second adhesive layer 11 so that the printed layer 7 side of the cover material 6 is in contact with the second adhesive layer 11. By the above attachment, a structure is obtained in which the cover material 6, the second adhesive layer 11, the second film sensor 5b, the first adhesive layer 11, the first film sensor 5a, the adhesive layer 4, and the release sheet are laminated in this order.

[0144] Next, the release sheet is peeled off from the above-mentioned structure, and the structure is attached to the display module 3 so that the exposed pressure-sensitive adhesive layer 4 contacts the display module 3. In this way, the touch panel 2 shown in FIG. 2 is manufactured.

[0145] Here, when the first adhesive layer 11 and / or the second adhesive layer 11 is made of an active energy ray-curable adhesive, the adhesive layer 11 in the above-mentioned structure or touch panel 2 is irradiated with active energy rays. This causes the active energy ray-curable component (E) in the adhesive layer 11 to polymerize, and the adhesive layer 11 is cured to become a cured adhesive layer. The adhesive layer 11 is usually irradiated with energy rays from one surface side of the above-mentioned structure or touch panel 2, preferably from the surface side of the cover material 6.

[0146] The active energy ray refers to electromagnetic waves or charged particle rays having an energy quantum, and specific examples thereof include ultraviolet rays, electron beams, etc. Among active energy rays, ultraviolet rays are particularly preferred because they are easy to handle.

[0147] The ultraviolet irradiation can be performed by a high pressure mercury lamp, a fusion H lamp, a xenon lamp, etc., and the amount of ultraviolet irradiation is 50 to 1000 mW / cm illuminance. 2 is preferably 100 to 600 mW / cm 2 The light intensity is preferably 50 to 10,000 mJ / cm. 2 is preferably 80 to 5000 mJ / cm 2 More preferably, it is 200 to 2000 mJ / cm 2 On the other hand, the irradiation with the electron beam can be carried out by an electron beam accelerator or the like, and the irradiation dose of the electron beam is preferably about 10 to 1000 krad.

[0148] The gel fraction of the adhesive (adhesive after active energy ray irradiation) constituting the cured adhesive layer is preferably 40% or more as a lower limit, particularly preferably 55% or more, and more preferably 65% ​​or more. When the lower limit of the gel fraction of the adhesive after active energy ray irradiation is as above, the durability is higher. In addition, the upper limit of the gel fraction is preferably 90% or less, particularly preferably 80% or less, and more preferably 75% or less. When the upper limit of the gel fraction of the adhesive after active energy ray irradiation is as above, it is possible to prevent the adhesive strength of the cured adhesive layer from decreasing and the durability from deteriorating. The method for measuring the gel fraction of the adhesive after active energy ray irradiation is as shown in the test example described below.

[0149] The adhesive strength of the adhesive sheet having the cured adhesive layer to soda lime glass is preferably 10N / 25mm or more as a lower limit, more preferably 20N / 25mm or more, particularly preferably 30N / 25mm or more, and even more preferably 40N / 25mm or more. When the adhesive strength has the above lower limit, the resulting product (touch panel 2) has high durability. The upper limit of the adhesive strength is not particularly limited, but is usually preferably 100N / 25mm or less, particularly preferably 80N / 25mm or less, and even more preferably 60N / 25mm or less.

[0150] The adhesive strength mentioned above basically refers to the adhesive strength measured by the 180-degree peeling method in accordance with JIS Z0237:2009. The measurement sample is 25 mm wide and 100 mm long, and the measurement sample is attached to the adherend and pressurized at 0.5 MPa and 50°C for 20 minutes, and then irradiated with active energy rays (ultraviolet rays) under the conditions shown in the test example described later. The adhesive strength is then measured at a peeling speed of 300 mm / min after leaving it for 24 hours under conditions of normal pressure, 23°C, and 50% RH.

[0151] When the touch panel 2 is placed under high temperature and high humidity conditions and a voltage is applied to the electrodes 52 under these conditions, migration of the electrodes 52 is effectively suppressed and changes in the resistance value of the electrodes 52 are also effectively suppressed, even if the electrodes 52 are formed from wiring made of a metal or metal oxide. This prevents driving defects of the touch panel 2 caused by breaks or short circuits in the electrodes 52.

[0152] Here, the change in resistance value of the electrode 52 will be specifically described. When polyethylene terephthalate and an electrode plate (a silver wiring electrode plate in this embodiment) are bonded via the adhesive layer 11 of the adhesive sheet 1 and the resulting laminate is subjected to a durability test (105°C / 100% RH, 3 hours, voltage of 5 V applied), the rate of change in resistance value of the electrode plate calculated by the following formula is preferably less than 500%, and more preferably less than 100%. The lower limit is not particularly limited, but is preferably 0% or more. Resistance change rate (%) = {(RR 0 ) / R 0}×100 (In the formula, R 0 is the initial resistance value (Ω) before the durability test, and R is the resistance value (Ω) after the durability test. The details of the method for measuring the rate of change in resistance value are as shown in the test examples described later.

[0153] When a soda lime glass and an ITO vapor deposition film are laminated via the adhesive layer 11 of the adhesive sheet 1, and a durability test (85°C, 85% RH, 1000 hours) is performed on the resulting laminate, the resistance change rate of the ITO vapor deposition film calculated by the above formula is preferably less than 300%, particularly preferably less than 100%, and more preferably less than 50%. The lower limit is not particularly limited, but is preferably 0% or more. Similarly, when a soda lime glass and an ITO vapor deposition film are laminated via the adhesive layer 11 of the adhesive sheet 1, and a durability test (95°C, 1000 hours) is performed on the resulting laminate, the resistance change rate of the ITO vapor deposition film calculated by the above formula is preferably less than 100%, particularly preferably less than 50%, and more preferably less than 20%. The lower limit is not particularly limited, but is preferably 0% or more.

[0154] The above-described embodiments are described for the purpose of facilitating understanding of the present invention, and are not described for the purpose of limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design modifications and equivalents that fall within the technical scope of the present invention.

[0155] For example, one of the release sheets 12a and 12b may be omitted from the adhesive sheet 1. Furthermore, in the touch panel 2, the printing layer 7 may not be formed on the cover material 6. EXAMPLES

[0156] The present invention will be described in more detail below with reference to examples, but the scope of the present invention is not limited to these examples.

[0157] Example 1 1. Preparation of (meth)acrylic acid ester polymer (A) 60 parts by mass of 2-ethylhexyl acrylate, 20 parts by mass of methyl methacrylate, and 20 parts by mass of 2-hydroxyethyl acrylate were copolymerized by solution polymerization to prepare a (meth)acrylic acid ester polymer (A). The molecular weight of this (meth)acrylic acid ester polymer (A) was measured by the method described below, and the weight average molecular weight (Mw) was 800,000.

[0158] 2. Preparation of adhesive composition 100 parts by mass (solid content equivalent; same below) of the (meth)acrylic acid ester polymer (A) obtained in step 1 above, 0.01 parts by mass of 1-[N,N-bis(2-ethylhexyl)aminomethyl]methylbenzotriazole as the rust inhibitor (B), 0.25 parts by mass of trimethylolpropane adduct tolylene diisocyanate as the crosslinking agent (C), and 0.25 parts by mass of 3-glycidyloxypropyltrimethoxysilane (D1) as the silane compound (D) were mixed, thoroughly stirred, and diluted with methyl ethyl ketone to obtain a coating solution of an adhesive composition.

[0159] Here, the formulations (solid content equivalent) of the pressure-sensitive adhesive composition when the (meth)acrylic acid ester polymer (A) is taken as 100 parts by mass (solid content equivalent) are shown in Table 1. Details of the abbreviations, components, etc. shown in Table 1 are as follows. [(Meth)acrylic acid ester polymer (A)] 2EHA: 2-ethylhexyl acrylate MMA: Methyl methacrylate HEA: 2-hydroxyethyl acrylate IBXA: Isobornyl acrylate ACMO: N-Acryloylmorpholine BA: n-butyl acrylate [Silane compounds (D)] D1: 3-glycidyloxypropyltrimethoxysilane D2: An organosilicon compound represented by the following structural formula (II): [ka] [Active energy ray-curable component (E)] ε-Caprolactone modified tris-(2-acryloxyethyl) isocyanurate (manufactured by Shin-Nakamura Chemical Co., Ltd., product name "NK Ester A-9300-1CL") [Photopolymerization initiator (F)] 1:1 (mass ratio) mixture of 1-hydroxy-cyclohexyl-phenyl-ketone and benzophenone [Ultraviolet absorber] Benzotriazole-based UV absorber (BASF Japan, product name "TINUVIN 384-2")

[0160] 3. Manufacturing of adhesive sheets The adhesive composition coating solution obtained in step 2 above was applied using a knife coater to the release-treated surface of a heavy-release release sheet (manufactured by Lintec Corporation, product name "SP-PET382150", thickness: 38 μm) in which one side of a polyethylene terephthalate film had been treated with a silicone-based release agent, and then the sheet was heated at 80°C for 1 minute and further heated at 110°C for 1 minute to form a coating layer (thickness: 75 μm).

[0161] Next, the coating layer on the heavy release type release sheet obtained above and a light release type release sheet (manufactured by Lintec Corporation, product name "SP-PET381130"), one side of which is a polyethylene terephthalate film treated with a silicone-based release agent, are laminated so that the release-treated surface of the light release type release sheet contacts the coating layer, and the sheet is aged for 7 days under conditions of 23°C and 50% RH to produce an adhesive sheet consisting of a heavy release type release sheet / adhesive layer (thickness: 75 μm) / light release type release sheet. The content of the rust inhibitor (B) in the adhesive constituting the adhesive layer was 0.01% by mass.

[0162] [Examples 2 to 14, Comparative Examples 1 to 6] Pressure-sensitive adhesive sheets were produced in the same manner as in Example 1, except that the types and ratios of the monomers constituting the (meth)acrylic acid ester polymer (A), the weight-average molecular weight of the (meth)acrylic acid ester polymer (A), the amount of the rust inhibitor (B), the amount of the crosslinking agent (C), the type of the silane compound (D), and the thickness of the pressure-sensitive adhesive layer were changed as shown in Table 1. Note that in Example 4, an ultraviolet absorber was further added, and in Example 12, an active energy ray-curable component (E) and a photopolymerization initiator (F) were further added.

[0163] The weight average molecular weight (Mw) mentioned above is a polystyrene-equivalent weight average molecular weight measured by gel permeation chromatography (GPC) under the following conditions (GPC measurement). <Measurement conditions> GPC measuring device: Tosoh HLC-8020 GPC columns (passed in the following order): Tosoh Corporation TSK guard column HXL-H TSK gel GMHXL (×2) TSK gel G2000HXL Measurement solvent: Tetrahydrofuran ·Measurement temperature: 40℃

[0164] [Test Example 1] (Measurement of gel fraction) The adhesive sheets obtained in the examples and comparative examples were cut to a size of 80 mm x 80 mm, the adhesive layer was wrapped in a polyester mesh (mesh size 200), and the mass was measured using a precision balance. The mass of the mesh alone was subtracted to calculate the mass of the adhesive alone. This mass was designated as M1.

[0165] Next, the adhesive wrapped in the polyester mesh was immersed in ethyl acetate at room temperature (23°C) for 24 hours. The adhesive was then removed and air-dried for 24 hours in an environment with a temperature of 23°C and a relative humidity of 50%, and then dried in an oven at 80°C for 12 hours. After drying, the mass was weighed using a precision balance, and the mass of the adhesive alone was calculated by subtracting the mass of the mesh alone. The mass at this time was designated M2. The gel fraction (%) was expressed as (M2 / M1) x 100. The results are shown in Table 2.

[0166] The gel fraction of the pressure-sensitive adhesive sheet of Example 12 was measured before and after ultraviolet (UV) irradiation of the pressure-sensitive adhesive layer (irradiation from the side of the heavy release type release sheet). The ultraviolet irradiation conditions were as follows.

[0167] <Ultraviolet irradiation conditions> -Uses high pressure mercury lamp ·Illuminance 200mW / cm 2 ,Light intensity 1000mJ / cm 2 The UV illuminance and light intensity meter used is the "UVPF-A1" manufactured by Eye Graphics.

[0168] [Test Example 2] (Measurement of adhesive strength) The light release type release sheet was peeled off from the adhesive sheet obtained in the Examples and Comparative Examples, and the exposed adhesive layer was attached to an easy-adhesion layer of a polyethylene terephthalate (PET) film (manufactured by Toyobo Co., Ltd., product name "Cosmoshine PET100A4360", thickness: 100 μm) having an easy-adhesion layer, to obtain a heavy release type release sheet / adhesive layer / PET film laminate. The obtained laminate was cut into a width of 25 mm and a length of 100 mm, and this was used as a sample.

[0169] The heavy release type release sheet was peeled off from the above sample under an environment of 23°C and 50% RH, and the exposed adhesive layer was attached to soda lime glass (manufactured by Nippon Sheet Glass Co., Ltd.), and then pressure was applied for 20 minutes at 0.5 MPa and 50°C in an autoclave manufactured by Kurihara Seisakusho Co., Ltd. After leaving the sample for 24 hours under conditions of 23°C and 50% RH, the adhesive strength (N / 25mm) was measured using a tensile tester (manufactured by Orientec Co., Ltd., product name "Tensilon") at a peel speed of 300mm / min and a peel angle of 180°. The measurement was performed under conditions other than those described here in accordance with JIS Z0237:2009. The results are shown in Table 2.

[0170] The adhesive strength of the adhesive sheet of Example 12 after ultraviolet (UV) irradiation was also measured separately. Specifically, after the above autoclave treatment, the adhesive layer was irradiated with ultraviolet light from the soda lime glass side under the same conditions as in Test Example 1. After that, the adhesive sheet was left for 24 hours under conditions of 23°C and 50% RH, and then the adhesive strength (N / 25mm; after UV) was measured in the same manner as above. The results are shown in Table 2.

[0171] [Test Example 3] (Haze value measurement) The adhesive layer of the adhesive sheet produced in the examples and comparative examples was attached to glass to prepare a measurement sample. After background measurement was performed on the glass, the haze value (total light haze value;%) of the measurement sample was measured using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name "NDH-5000") in accordance with JIS K7136:2000. The results are shown in Table 2.

[0172] [Test Example 4] (Measurement of total light transmittance) The adhesive layer of the adhesive sheet produced in the examples and comparative examples was attached to glass to prepare a measurement sample. After background measurement was performed on the glass, the total light transmittance (%) of the measurement sample was measured using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name "SH-7000") in accordance with JIS K7361-1:1997. The results are shown in Table 2.

[0173] [Test Example 5] (Measurement of L*a*b* color system) The chromaticity a* and chromaticity b* defined by the CIE1976L*a*b* color system were measured for the adhesive layers of the adhesive sheets produced in the Examples and Comparative Examples using a simultaneous photometric spectrophotometer (manufactured by Nippon Denshoku Industries Co., Ltd., product name "SQ2000"). The results are shown in Table 2.

[0174] [Test Example 6] (Evaluation of migration prevention effect using silver wiring electrode plate) (1) Preparation of silver wiring electrode plate Silver paste (manufactured by Toyochem, product name "RA FS088") was applied by screen printing onto one side of soda lime glass (length 70 mm × width 150 mm × thickness 1.0 mm; manufactured by Nippon Sheet Glass Co., Ltd.) so that the positive and negative electrode wires were linear and parallel to each other. The paste was then heated at 135°C for 30 minutes to harden the glass (silver-wired electrode plate) onto which silver wires (thickness: 0.15 μm) were printed. Silver-wired electrode plate X had a positive and negative wire width of 10 μm and a gap between the wires (distance between the wires) of 10 μm. 10 , silver wiring electrode plate X having a wiring width of 15 μm and a wiring distance of 15 μm 15 , silver wiring electrode plate X having a wiring width of 30 μm and a wiring distance of 30 μm 30 The wiring thickness of each silver wiring electrode plate was 0.15 μm.

[0175] (2) Calculation of the degree of coating The light release type release sheet was peeled off from the adhesive sheet obtained in the Examples and Comparative Examples, and the exposed adhesive layer was attached to an easy-adhesion layer of a polyethylene terephthalate (PET) film (manufactured by Toyobo Co., Ltd., product name "Cosmoshine PET100A4360", thickness: 100 μm) having an easy-adhesion layer, to obtain a heavy release type release sheet / adhesive layer / PET film laminate. Next, the heavy release type release sheet was peeled off from the laminate, and the exposed adhesive layer was attached to the silver wiring electrode plate X described above. 10 , X 15 or X 30The silver wiring electrode plate sample was attached onto the positive electrode wiring and the negative electrode wiring in the silver wiring electrode plate sample. The silver wiring electrode plate sample was then subjected to autoclave treatment at 50° C. and 0.5 MPa for 20 minutes, and then left to stand at 23° C. and 50% RH for 24 hours.

[0176] For the pressure-sensitive adhesive sheet of Example 12, after the above autoclave treatment, the pressure-sensitive adhesive layer was irradiated with ultraviolet light from the PET film side under the same conditions as in Test Example 1, and this was used as a sample.

[0177] Here, the adhesive sheet and the silver wiring electrode plate X prepared in Example 1 10 The coverage of the silver wiring electrode plate sample was calculated as follows. First, the silver wiring electrode plate sample was measured from a 1 mm 2 Wiring volume (μm 3 ) was calculated as follows: Silver wiring electrode board 10 The wiring width is 10 μm, the distance between the wirings is 10 μm, and the wiring thickness is 0.15 μm. In this case, the wiring volume per wiring is 10μm×0.15μm×1000μm(μm 3 ) And, 1mm in plan view 2 The number of wires per (1000μm×1000μm) is 1000μm / (10μm+10μm)(pieces) Therefore, the above wiring has a planar area of ​​1 mm 2 Wiring volume per unit (μm 3 ) was calculated according to the following formula (1-1). {10μm×0.15μm×1000μm}×{1000μm / (10μm+10μm)}···(1-1) Next, the adhesive layer of the silver wiring electrode plate sample was measured from a 1 mm 2 Adhesive volume per (1000μm×1000μm) (μm 3 ) was calculated by the following formula (2-1): As described above, the thickness of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet of Example 1 was 75 μm. 75μm×1000μm×1000μm(μm 3 ) · · · (2-1) The coverage was calculated by dividing (2-1) by (1-1). For the other examples and comparative examples, the coverage was calculated in the same manner as in Example 1. The results are shown in Table 2.

[0178] (3) Migration prevention effect The silver wiring electrode plate sample was left to stand for 3 hours under humid heat conditions of 105°C and 100% RH, and a voltage of 5 V was applied between the electrodes in this state. The positive electrode wiring and the negative electrode wiring were then observed under an optical microscope (magnification: 10x), and the migration prevention effect was evaluated based on the following evaluation criteria. The results are shown in Table 2. No defects such as lifting, peeling, or air bubble generation were observed in any of the samples of the examples and comparative examples. ◯: No dissolution of the positive electrode wiring or no dendrite formation in the negative electrode wiring was observed. ×: Dissolution of the positive electrode wiring or formation of dendrites in the negative electrode wiring is observed.

[0179] [Test Example 7] (Evaluation of color change of wiring using silver wiring electrode plate) A silver wiring electrode plate sample prepared in the same manner as in Test Example 6 was left to stand for 3 hours under humid heat conditions of 105°C and 100% RH, and a voltage of 5 V was applied between the electrodes in this state. After that, the positive electrode wiring and the negative electrode wiring were observed under an optical microscope (magnification: 10x), and the color change of the wiring was evaluated based on the following evaluation criteria. The results are shown in Table 2. ◎: There is no change in color of the positive and negative wiring. ○: Discoloration is observed in the positive or negative wiring. -: Migration occurred (dissolution of the positive electrode wiring or formation of dendrites in the negative electrode wiring was observed), so evaluation was not possible.

[0180] [Test Example 8] (Evaluation of resistance change using silver wiring electrode plate) For the silver wiring electrode plate sample prepared in the same manner as in Test Example 6, a voltage of 5 V was applied between the positive and negative wiring, and the initial resistance value R was measured using a digital high tester (manufactured by Hioki E.E. Corporation, product name "Digital High Tester 3802-50"). 0 (Ω) was measured.

[0181] Next, the silver wiring electrode plate sample was placed in a humid and hot environment of 105°C and 100% RH for 3 hours, and a voltage of 5 V was applied between the electrodes in this state. It was then left to stand in a normal temperature and humidity environment of 23°C and 50% RH for 24 hours, and the resistance value (Ω) was measured in the same manner as the initial resistance value above. This was the resistance value R after the durability test. The resistance value change rate (%) was calculated from the measured values ​​obtained using the following formula. Resistance change rate (%) = {(RR 0 ) / R 0}×100

[0182] The resistance change was evaluated based on the rate of change in resistance calculated above, according to the following criteria. The results are shown in Table 2. ○: Resistance change rate is less than 100% △: Resistance change rate is 100% or more but less than 500% ×: Resistance change rate is 500% or more

[0183] [Test Example 9] (Evaluation of resistance change using ITO vapor deposition film) A soda lime glass (length 70 mm × width 150 mm × thickness 1.0 mm; manufactured by Nippon Sheet Glass Co., Ltd.) was bonded to an ITO vapor deposition film (manufactured by Oike Kogyo Co., Ltd., product name "Tetlite TCF KH150NMH2-125-U6 / T2", the ITO vapor deposition film side was in contact with the adhesive layer) via the adhesive layer of the adhesive sheet obtained in the Examples and Comparative Examples. Then, the glass was autoclaved for 20 minutes under conditions of 50°C and 0.5 MPa, and then left for 24 hours under conditions of 23°C and 50% RH to obtain an ITO vapor deposition film sample.

[0184] For the pressure-sensitive adhesive sheet of Example 12, after the above autoclave treatment, the pressure-sensitive adhesive layer was irradiated with ultraviolet light from the soda-lime glass side under the same conditions as in Test Example 1, and this was used as a measurement sample.

[0185] The initial resistance value R of the ITO deposition film sample was measured using a non-contact resistance measuring device (product name "EC-80" manufactured by Napson Co., Ltd.). 0 (Ω) was measured.

[0186] Next, the ITO vapor-deposited film sample was placed in a humid and hot environment of 85°C and 85% RH for 1000 hours, or in a high-temperature environment of 95°C for 1000 hours. After that, it was left to stand in a normal temperature and humidity environment of 23°C and 50% RH for 24 hours, and the resistance value (Ω) was measured in the same manner as the initial resistance value described above. This was defined as the resistance value R after the durability test. The resistance value change rate (%) was calculated from the obtained measured values ​​using the same formula as in Test Example 8.

[0187] The resistance change was evaluated based on the rate of change in resistance calculated above, according to the following criteria. The results are shown in Table 2. <Heat and humidity environment of 85℃ / 85%RH> ◎: Resistance change rate is less than 50% ○: Resistance change rate is 50% or more but less than 100% △: Resistance change rate is 100% or more but less than 300% ×: Resistance change rate is 300% or more <High temperature environment of 95℃> ◎: Resistance change rate is less than 20% ○: Resistance change rate is 20% or more and less than 50% △: Resistance change rate is 50% or more but less than 100% ×: Resistance change rate is 100% or more

[0188] [Table 1]

[0189] [Table 2]

[0190] As can be seen from Table 2, the adhesive sheet obtained in the example was able to prevent migration in the silver wiring electrode plate and prevent discoloration of the wiring. In addition, the adhesive sheet obtained in the example was able to suppress changes in the resistance value of the silver wiring electrode plate and the ITO vapor deposition film. [Industrial Applicability]

[0191] The display according to the present invention is suitable as, for example, a capacitive touch panel. [Explanation of symbols]

[0192] 1...Adhesive sheet 11...Adhesive layer 12a, 12b...Release sheet 2. Touch panel 3...Display module 4...Adhesive layer 5a…First film sensor 5b…Second film sensor 51...Base film 52...Electrode 6…Cover material 7...Printing layer

Claims

1. A first display member; A second display member; an adhesive layer that bonds the first display member and the second display member to each other; A display comprising: the first display member and / or the second display member has an electrode formed of a wiring made of a metal or a metal oxide on at least the surface on which the first display member and / or the second display member are bonded; The wiring width of the wiring is 50 μm or less, the pressure-sensitive adhesive layer is made of a pressure-sensitive adhesive containing a rust inhibitor and a silane compound, The rust inhibitor is a benzotriazole-based compound, The pressure-sensitive adhesive layer is viewed from above at 1 mm ２ Adhesive volume per unit (μm ３ ) at a distance of 1 mm from the plan view of the wiring. ２ Wiring volume per unit (μm ３ ) is 200 or more and 10,000 or less, When the content of the rust inhibitor in the pressure-sensitive adhesive is α% by mass and the thickness of the pressure-sensitive adhesive layer is Z μm, the following formula is satisfied: 0.7≦α×Z≦100 A display characterized by:

2. A first display member; A second display member; an adhesive layer that bonds the first display member and the second display member to each other; A display comprising: the first display member and / or the second display member has an electrode formed of a wiring made of a metal or a metal oxide on at least the surface on which the first display member and / or the second display member are bonded; The wiring width of the wiring is 50 μm or less, the pressure-sensitive adhesive layer is made of a pressure-sensitive adhesive containing a rust inhibitor and a silane compound, The rust inhibitor is a benzotriazole-based compound, The pressure-sensitive adhesive layer is viewed from above at 1 mm ２ Adhesive volume per unit (μm ３ ) at a distance of 1 mm from the plan view of the wiring. ２ Wiring volume per unit (μm ３ ) is 200 or more, The thickness of the pressure-sensitive adhesive layer is 1 μm or more and 200 μm or less, When the content of the rust inhibitor in the pressure-sensitive adhesive is α% by mass and the thickness of the pressure-sensitive adhesive layer is Z μm, the following formula is satisfied: 0.7≦α×Z≦100 A display characterized by:

3. A first display member; A second display member; an adhesive layer that bonds the first display member and the second display member to each other; A display comprising: the first display member and / or the second display member has an electrode formed of a wiring made of a metal or a metal oxide on at least the surface on which the first display member and / or the second display member are bonded; the pressure-sensitive adhesive layer is made of an acrylic pressure-sensitive adhesive obtained from a pressure-sensitive adhesive composition containing a (meth)acrylic acid ester polymer and a rust inhibitor; The (meth)acrylic acid ester polymer contains, as a monomer unit constituting the polymer, 6% by mass or more and 35% by mass or less of a monomer having a hydroxyl group in the molecule, The rust inhibitor is a benzotriazole-based compound, The pressure-sensitive adhesive layer is viewed from above at 1 mm ２ Adhesive volume per unit (μm ３ ) at a distance of 1 mm from the plan view of the wiring. ２ Wiring volume per unit (μm ３ ) is 200 or more and 10,000 or less, When the content of the rust inhibitor in the pressure-sensitive adhesive is α% by mass and the thickness of the pressure-sensitive adhesive layer is Z μm, the following formula is satisfied: 0.7≦α×Z≦100 A display characterized by:

4. A first display member; A second display member; an adhesive layer that bonds the first display member and the second display member to each other; A display comprising: the first display member and / or the second display member has an electrode formed of a wiring made of a metal or a metal oxide on at least the surface on which the first display member and / or the second display member are bonded; the pressure-sensitive adhesive layer is made of an acrylic pressure-sensitive adhesive obtained from a pressure-sensitive adhesive composition containing a (meth)acrylic acid ester polymer and a rust inhibitor; The (meth)acrylic acid ester polymer contains, as a monomer unit constituting the polymer, 6% by mass or more and 35% by mass or less of a monomer having a hydroxyl group in the molecule, The rust inhibitor is a benzotriazole-based compound, The pressure-sensitive adhesive layer is viewed from above at 1 mm ２ Adhesive volume per unit (μm ３ ) at a distance of 1 mm from the plan view of the wiring. ２ Wiring volume per unit (μm ３ ) is 200 or more, The thickness of the pressure-sensitive adhesive layer is 1 μm or more and 200 μm or less, When the content of the rust inhibitor in the pressure-sensitive adhesive is α% by mass and the thickness of the pressure-sensitive adhesive layer is Z μm, the following formula is satisfied: 0.7≦α×Z≦100 A display characterized by:

5. 5. The indicator according to claim 1, wherein the content of the rust inhibitor in the adhesive is 0.001% by mass or more and 1% by mass or less.

6. 3. The display according to claim 1, wherein the adhesive is an acrylic adhesive.

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