JP6937338B2 - Display and adhesive sheet - Google Patents

Description

The present invention relates to a display body suitable for in-vehicle use and the like, and an adhesive sheet used for the display body.

Recent display bodies (displays), for example, in-vehicle displays in automobile instrument panels, car navigation systems, various instruments provided in consoles, display bodies such as tablet terminals for general users, commercial tablets In displays such as terminals and digital signage, and displays such as outdoor digital signage, image display devices such as liquid crystal displays and organic electroluminescence devices are often used.

As described above, in an in-vehicle display body or the like, when the display body is turned off, the appearance of the display unit of the display body and the non-display part, for example, a peripheral member such as a frame material is harmoniously designed. It may be required to improve the sex. For that purpose, it is conceivable to color the display body. For example, Patent Documents 1 to 4 disclose inventions relating to coloring the display body.

Japanese Unexamined Patent Publication No. 2000-313871 Japanese Unexamined Patent Publication No. 2009-188298 Japanese Unexamined Patent Publication No. 2012-234028 JP-A-2017-57375

However, since the techniques disclosed in Patent Documents 1 to 4 have different purposes of coloring, it is not possible to harmonize the appearance of the display unit and the non-display unit when the display body is turned off to improve the design. could not.

The present invention has been made in view of the above-mentioned actual conditions, and an object of the present invention is to provide a display body having improved design and an adhesive sheet capable of improving the design of the display body.

ことを特徴とする表示体を提供する（発明１）。 In order to achieve the above object, firstly, the present invention has a display unit and a non-display unit, and at least one display body component, another display body component, and the one display body configuration. A display body including a member and a pressure-sensitive adhesive layer to which the other display body constituent members are bonded, wherein the total light transmittance of the pressure-sensitive adhesive layer in the display unit is 3% or more, and CIE1976L * a The brightness L * of the display unit defined by the * b * color system is L * 2, the chromaticity a * of the display unit is a * 2, and the chromaticity b * of the display unit is b * 2. When the brightness L * of the non-display part is L * 3, the chromaticity a * of the non-display part is a * 3, and the chromaticity b * of the non-display part is b * 3, the following equation (I) ) Is the color difference ΔE calculated by 2.00 or less.

(Invention 1).

In the above invention (Invention 1), when the total light transmittance is 3% or more, the visibility of the image / video can be ensured when the display body is lit. Further, since the color difference ΔE is as described above, the appearance harmony between the display unit and the non-display unit is achieved when the display body is turned off, and the design is improved.

In the above invention (Invention 1), L * 3 of the non-display unit is 0.1 to 50, a * 3 of the non-display unit is -20 to 20, and b * 3 of the non-display unit. Is preferably -20 to 20 (Invention 2).

In the above inventions (Inventions 1 and 2), it is preferable that the non-display portion is black (Invention 3).

In the above inventions (Inventions 1 to 3), at least one of the one display body constituent member and the other display body constituent member has a convex portion on the surface on the pressure-sensitive adhesive layer side, and the convex portion. However, it is preferable to form a part or all of the non-display portion (Invention 4).

ことを特徴とする粘着シートを提供する（発明５）。 Secondly, the present invention is an adhesive sheet provided with an adhesive layer for bonding one display body component member constituting a display body having a display unit and a non-display unit and another display body component member. The display body obtained by laminating the one display body component and the other display body component by the pressure-sensitive adhesive layer, wherein the total light transmittance of the pressure-sensitive adhesive layer is 3% or more. In, the brightness L * of the display unit is L * 2, the chromaticity a * of the display unit is a * 2, and the chromaticity b * of the display unit is defined by the CIE1976 L * a * b * color system. When b * 2, the brightness L * of the non-display portion is L * 3, the chromaticity a * of the non-display portion is a * 3, and the chromaticity b * of the non-display portion is b * 3. The pressure-sensitive adhesive layer is colored so that the color difference ΔE calculated by the following formula (I) is 2.00 or less.

(Invention 5).

In the above invention (Invention 5), the lightness L * of the pressure-sensitive adhesive layer is L * 1, and the color degree a * of the pressure-sensitive adhesive layer is a * 1, as defined by the CIE1976 L * a * b * color system. When the chromaticity b * of the pressure-sensitive adhesive layer is b * 1, L * 1 of the pressure-sensitive adhesive layer is 5 to 95, and a * 1 of the pressure-sensitive adhesive layer is -20 to 20. The pressure b * 1 of the pressure-sensitive adhesive layer is preferably -20 to 20 (Invention 6).

In the above inventions (Inventions 5 and 6), the haze value of the pressure-sensitive adhesive layer is preferably 0.1% or more and 80% or less (Invention 7).

In the above inventions (Inventions 5 to 7), it is preferable that the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer contains a colorant (Invention 8).

In the above invention (Invention 8), the colorant is preferably a black pigment or dye (Invention 9).

In the above inventions (Inventions 5 to 9), it is preferable to provide two release sheets and the pressure-sensitive adhesive layer sandwiched between the release sheets so as to be in contact with the release surfaces of the two release sheets (invention). 10).

The display body according to the present invention has improved design by harmonizing the appearance of the display unit and the non-display unit when the light is turned off. Further, according to the adhesive sheet according to the present invention, the design of the display body can be improved.

It is sectional drawing of the display body which concerns on one Embodiment of this invention. It is sectional drawing of the pressure-sensitive adhesive sheet which concerns on one Embodiment of this invention. It is sectional drawing of the display body which concerns on other embodiment of this invention.

Hereinafter, embodiments of the present invention will be described.
[Display body]
The display body (display) according to the embodiment of the present invention has a display unit and a non-display unit, and at least one display body component, another display body component, and one display body component. And an adhesive layer for laminating other display body components.

Examples of the type of display body according to the present embodiment include an in-vehicle display body in an instrument panel of an automobile, a car navigation system, various instruments provided in a console, and a display body such as a tablet terminal for general users. Examples thereof include a display body such as a commercial tablet terminal and a digital signage, and a display body such as an outdoor digital signage. However, the display body according to the present invention is not limited to these.

Examples of the display device of the display body according to the present embodiment include a liquid crystal (LCD) display, a light emitting diode (LED) display, an organic electroluminescence (organic EL) display, an electronic paper, and the like, and a touch panel. It may be.

The display unit of the display body in the present embodiment means a portion where an image / video is displayed by the display device as described above. Further, the non-display portion of the display body in the present embodiment means a portion where an image / video is not displayed on the display body, for example, a portion of a print layer formed in a frame shape on a display body constituent member or a display body configuration. A member provided around the member, a member for partitioning the screen, or the like is applicable.

In the display body according to the present embodiment, the total light transmittance of the pressure-sensitive adhesive layer in the display portion is 3% or more. When the total light transmittance is 3% or more, the visibility of the image / video can be ensured when the display body is lit. The total light transmittance in the present specification is a value measured in accordance with JIS K7361-1: 1997.

Further, in the display body according to the present embodiment, the brightness L * of the display unit is L * 2, the chromaticity a * of the display unit is a * 2, and the display unit is defined by the CIE1976L * a * b * color system. The chromaticity b * of the non-display part is b * 2, the lightness L * of the non-display part is L * 3, the chromaticity a * of the non-display part is a * 3, and the chromaticity b * of the non-display part is b * 3. Occasionally, the color difference ΔE calculated by the following formula (I) is 2.00 or less.

In the display body according to the present embodiment, since the color difference ΔE is as described above, the appearance harmony between the display unit and the non-display unit is achieved when the display body is turned off, and the design is improved. The methods for measuring the lightness L *, the chromaticity a *, and the b * in the present specification are as shown in the test examples described later.

From the viewpoint of visibility of images and videos, the total light transmittance of the adhesive layer in the display portion is 3% or more, preferably 10% or more, more preferably 25% or more, and particularly preferably 40. % Or more, more preferably 50% or more. The upper limit of the total light transmittance is usually 100% or less, and in consideration of the relationship with the color difference ΔE, it is preferably 98% or less, more preferably 90% or less, and particularly 80% or less. It is preferably 70% or less, and most preferably 57% or less.

Further, from the viewpoint of appearance harmony between the display unit and the non-display unit, the color difference ΔE is 2.00 or less, preferably 1.80 or less, more preferably 1.50 or less, and particularly preferably. Is 1.20 or less, and considering the visibility of images and videos, it is more preferably 1.00 or less, and most preferably 0.80 or less. The lower limit of the color difference ΔE is not particularly limited, and the smallest value is 0. However, considering the relationship with the total light transmittance, it is preferably 0.01 or more, and particularly 0.05 or more. Is preferable, and more preferably 0.1 or more.

The L * 3 of the non-display part is preferably 0.1 to 50, the a * 3 of the non-display part is -20 to 20, and the b * 3 of the non-display part is preferably -20 to 20. It is more preferable that L * 3 of the display unit is 0.5 to 30, a * 3 of the non-display unit is -10 to 10, and b * 3 of the non-display unit is -10 to 10, in particular. It is preferable that L * 3 of the non-display part is 1.0 to 10, a * 3 of the non-display part is -5 to 5, b * 3 of the non-display part is -5 to 5, and further. It is preferable that L * 3 of the non-display part is 2.0 to 5.0, a * 3 of the non-display part is -1 to 1, and b * 3 of the non-display part is -1 to 1. .. As a result, the above-mentioned color difference ΔE can be easily satisfied, and the display body has a preferable color as a non-display portion. Specifically, the non-display portion is preferably black.

On the other hand, it is preferable that L * 2 of the display unit is 0.1 to 50, a * 2 of the display unit is -20 to 20, and b * 2 of the display unit is -20 to 20. L * 2 is 0.5 to 30, a * 2 of the display unit is -10 to 10, and b * 2 of the display unit is more preferably -10 to 10, and particularly L of the display unit. * 2 is 1.0 to 10, preferably a * 2 of the display unit is -5 to 5, b * 2 of the display unit is -5 to 5, and further, L * 2 of the display unit. Is 2.0 to 5.0, a * 2 of the display unit is preferably -1 to 1, and b * 2 of the display unit is preferably -1 to 1. As a result, the above-mentioned color difference ΔE can be easily satisfied, and when the display body is turned off, the display body has a preferable color as a display unit. Specifically, the display unit is preferably black.

Further, the lightness L * of the pressure-sensitive adhesive layer used in the present embodiment, which is defined by the CIE1976 L * a * b * color system, is L * 1, the color degree a * of the pressure-sensitive adhesive layer is a * 1, and the pressure-sensitive adhesive. When the chromaticity b * of the layer is b * 1, the L * 1 of the pressure-sensitive adhesive layer is 5 to 95, the a * 1 of the pressure-sensitive adhesive layer is -20 to 20, and the b * of the pressure-sensitive adhesive layer. 1 is preferably -20 to 20, particularly L * 1 of the pressure-sensitive adhesive layer is 8 to 93, a * 1 of the pressure-sensitive adhesive layer is -10 to 10, and b * 1 of the pressure-sensitive adhesive layer is. It is preferably -10 to 10, and the L * 1 of the pressure-sensitive adhesive layer is 10 to 90, the a * 1 of the pressure-sensitive adhesive layer is -5 to 5, and the b * 1 of the pressure-sensitive adhesive layer is-. It is preferably 5 to 5. This makes it easier to satisfy the above-mentioned color difference ΔE and total light transmittance. Specifically, the pressure-sensitive adhesive layer is preferably colored black.

The difference (L * 2-L * 3) between the brightness L * 2 of the display unit and the brightness L * 3 of the non-display unit in the above formula (I) is preferably −2.00 to 2.00. However, the difference between the chromaticity a * 2 of the display unit and the chromaticity a * 3 of the non-display unit (a * 2-a * 3) and the chromaticity b * 2 of the display unit and the chromaticity b * of the non-display unit are Considering the relationship with the difference from 3 (b * 2-b * 3), it is preferably −1.50 to 1.50, more preferably −1.00 to 1.00, and in particular. It is preferably −0.80 to 0.80, more preferably −0.60 to 0.60, and most preferably −0.40 to 0.40. This makes it easier to satisfy the color difference ΔE described above.

The difference (a * 2-a * 3) between the chromaticity a * 2 of the display unit and the chromaticity a * 3 of the non-display unit in the above formula (I) is −2.00 to 2.00. However, the difference (L * 2-L * 3) between the brightness L * 2 of the display unit and the brightness L * 3 of the non-display unit and the chromaticity b * 2 of the display unit and the chromaticity b * of the non-display unit are used. Considering the relationship with the difference from 3 (b * 2-b * 3), it is preferably −1.50 to 1.50, more preferably −1.00 to 1.00, and in particular. It is preferably −0.80 to 0.80, more preferably −0.60 to 0.60, and most preferably −0.54 to 0.54. This makes it easier to satisfy the color difference ΔE described above.

The difference (b * 2-b * 3) between the chromaticity b * 2 of the display unit and the chromaticity b * 3 of the non-display unit in the above formula (I) is −2.00 to 2.00. However, the difference (L * 2-L * 3) between the brightness L * 2 of the display unit and the brightness L * 3 of the non-display unit and the chromaticity a * 2 of the display unit and the chromaticity a * of the non-display unit are used. Considering the relationship with the difference from 3 (a * 2-a * 3), it is preferably −1.50 to 1.50, more preferably −1.00 to 1.00, and in particular. It is preferably −0.80 to 0.80, more preferably −0.5 to 0.50, and most preferably −0.25 to 0.25. This makes it easier to satisfy the color difference ΔE described above.

Here, at least one of the above-mentioned display body constituent member and the other display body constituent member may have a convex portion on the surface on the side to be bonded by the pressure-sensitive adhesive layer. In this case, the convex portion may form a part or all of the non-display portion. Examples of such a convex portion include a printing layer formed in a plan view frame shape on the pressure-sensitive adhesive layer side of the display body constituent member. An example of a display body having such a convex portion will be described below with reference to the drawings.

As shown in FIG. 1, the display body 2 according to the present embodiment includes a first display body constituent member 21 (one display body constituent member) and a second display body constituent member 22 (another display body constituent member). ) And an adhesive layer 11 located between them and for sticking the first display body constituent member 21 and the second display body constituent member 22 to each other. In the present embodiment, the first display body constituent member 21 has a print layer 3 which is an example of a convex portion on the surface on the pressure-sensitive adhesive layer 11 side. The print layer 3 as the convex portion has a step with respect to the portion where the print layer 3 does not exist.

The first display body component 21 is preferably a protective panel made of a glass plate, a plastic plate, or the like, or a laminated body containing them, and in particular, is made of a plastic plate, a laminated body including the plastic plate, or the like. It is preferably a protective panel. In this case, the print layer 3 is generally formed in a frame shape on the pressure-sensitive adhesive layer 11 side of the first display body constituent member 21.

The glass plate is not particularly limited, and for example, chemically strengthened glass, non-alkali glass, quartz glass, soda lime glass, barium / strontium-containing glass, aluminosilicate glass, lead glass, borosilicate glass, barium borosilicate. Examples include glass. The thickness of the glass plate is not particularly limited, but is usually 0.1 to 5 mm, preferably 0.2 to 2 mm.

The plastic plate is not particularly limited, and is, for example, an acrylic resin plate such as a polycarbonate resin (PC) plate or a polymethyl methacrylate resin (PMMA) plate, or an acrylic such as a polymethyl methacrylate resin layer on the polycarbonate resin plate. Examples thereof include a plastic plate in which a resin layer is laminated. The above-mentioned polycarbonate resin plate may contain a resin other than the polycarbonate resin as a material constituting the above-mentioned polycarbonate resin plate, and the above-mentioned acrylic resin plate may contain a resin other than the acrylic resin as the material constituting the above-mentioned acrylic resin plate. It may be contained. The plastic plate may contain an ultraviolet absorber.

The thickness of the plastic plate is not particularly limited, but is usually 0.2 to 5 mm, preferably 0.4 to 3 mm, and particularly preferably 0.6 to 2.5 mm.

Various functional layers (transparent conductive film, metal layer, silica layer, hard coat layer, antiglare layer, etc.) may be provided on one side or both sides of the glass plate or the plastic plate, or optical members are laminated. It may have been done. Further, the transparent conductive film and the metal layer may be patterned.

The second display body component 22 is an optical member to be attached to the first display body component 21, a display module (for example, a liquid crystal (LCD) module, a light emitting diode (LED) module, an organic electroluminescence (organic)). An EL) module or the like), an optical member as a part of the display body module, or a laminated body including the display body module is preferable.

Examples of the optical member include a shatterproof film, a polarizing plate (polarizing film), a polarizer, a retardation plate (phase difference film), a viewing angle compensation film, a brightness improving film, a contrast improving film, a liquid crystal polymer film, and a diffusion film. , Semi-transmissive reflective film, transparent conductive film and the like. Examples of the shatterproof film include a hard coat film in which a hard coat layer is formed on one side of the base film.

The material constituting the printing layer 3 is not particularly limited, and a known material for printing is used. The thickness of the print layer 3, that is, the lower limit of the height of the step is preferably 3 μm or more, more preferably 5 μm or more, particularly preferably 7 μm or more, and further preferably 10 μm or more. preferable. When the lower limit of the height of the step is the above, it is possible to sufficiently secure the concealment property such as making the electric wiring invisible from the viewer side. The upper limit of the height of the step is preferably 50 μm or less, more preferably 35 μm or less, particularly preferably 25 μm or less, and further preferably 20 μm or less. When the upper limit of the height of the step is the above, it is possible to prevent deterioration of the step followability of the pressure-sensitive adhesive layer 11 with respect to the printing layer 3.

The pressure-sensitive adhesive layer 11 can be preferably formed by the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet described below. However, the present invention is not limited to this as long as the above-mentioned physical characteristics are satisfied.

[Adhesive sheet]
The pressure-sensitive adhesive sheet according to an embodiment of the present invention includes an adhesive layer for bonding one display body component that constitutes a display body having a display unit and a non-display unit and another display body component. It is preferably formed by laminating a release sheet on one side or both sides of the pressure-sensitive adhesive layer.

The pressure-sensitive adhesive layer in the present embodiment is colored so that the total light transmittance is 3% or more and the color difference ΔE described above satisfies 2.00 or less. These preferred ranges, as well as the lightness L * (= L * 1) of the pressure-sensitive adhesive layer, the chromaticity a * (= a * 1) of the pressure-sensitive adhesive layer, and the chromaticity b * (= b) of the pressure-sensitive adhesive layer in the present embodiment. The preferable range of * 1) is as described above.

FIG. 2 shows a specific configuration as an example of the pressure-sensitive adhesive sheet according to the present embodiment.
As shown in FIG. 2, the adhesive sheet 1 is sandwiched between the two release sheets 12a and 12b and the two release sheets 12a and 12b so as to be in contact with the release surfaces of the two release sheets 12a and 12b. It is composed of a pressure-sensitive adhesive layer 11. The peeling surface of the release sheet in the present specification means a surface of the release sheet that has peelability, and includes both a surface that has been peeled and a surface that exhibits peelability without peeling. ..

1. 1. Each member 1-1. Adhesive layer The type of the adhesive constituting the adhesive layer 11 of the adhesive sheet 1 according to the present embodiment is not particularly limited, and for example, an acrylic adhesive, a polyester adhesive, a polyurethane adhesive, and a rubber adhesive. It may be either an agent or a silicone-based adhesive. Further, the pressure-sensitive adhesive may be an emulsion type, a solvent type or a solvent-free type, and may be either a crosslinked type or a non-crosslinked type. Among them, an acrylic pressure-sensitive adhesive having excellent adhesive physical properties, optical properties, and the like is preferable.

Further, the acrylic pressure-sensitive adhesive may be an active energy ray-curable adhesive or an active energy ray non-curable adhesive. Further, as the acrylic pressure-sensitive adhesive, a cross-linked type is preferable, and a heat-cross-linked type is more preferable.

Specifically, the pressure-sensitive adhesive is a pressure-sensitive composition containing a (meth) acrylic acid ester polymer (A), a cross-linking agent (B), and a colorant (C) (hereinafter, "sticky composition"). It may be referred to as "P"), and it is preferably formed by cross-linking. When the pressure-sensitive adhesive is an active energy ray-curable pressure-sensitive adhesive, the pressure-sensitive adhesive composition P preferably further contains an active energy ray-curable component (D).

The pressure-sensitive adhesive obtained from the pressure-sensitive adhesive composition P can exhibit excellent optical properties, adhesive strength, durability (step followability under high temperature and high humidity conditions, blister resistance) and the like. In addition, in this specification, (meth) acrylic acid means both acrylic acid and methacrylic acid. The same applies to other similar terms. In addition, the concept of "polymer" shall be included in "polymer".

(1) Ingredients of Adhesive Composition (1-1) (Meta) Acrylic Acid Ester Polymer (A)
The (meth) acrylic acid ester polymer (A) in the present embodiment contains a reactive group-containing monomer having a reactive group in the molecule that reacts with the cross-linking agent (B) as a monomer unit constituting the polymer. Is preferable. The reactive group derived from this reactive group-containing monomer reacts with the cross-linking agent (B) to form a cross-linked structure (three-dimensional network structure), and a pressure-sensitive adhesive having a desired cohesive force can be obtained.

Examples of the reactive group-containing monomer include a monomer having a hydroxyl group in the molecule (hydroxyl group-containing monomer), a monomer having a carboxy group in the molecule (carboxy group-containing monomer), and a monomer having an amino group in the molecule (amino group-containing monomer). ) Etc. are preferably mentioned. Among these, a hydroxyl group-containing monomer or a carboxy group-containing monomer having excellent reactivity with the cross-linking agent (B) is preferable, and the hydroxyl group-containing monomer and the carboxy group-containing monomer may be used in combination.

Examples of the hydroxyl group-containing monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and (meth). ) (Meta) Acrylic acid hydroxyalkyl esters such as 3-hydroxybutyl acrylate and 4-hydroxybutyl (meth) acrylic acid can be mentioned. Among them, hydroxy having 1 to 4 carbon atoms is considered from the viewpoint of the reactivity of the obtained (meth) acrylic acid ester polymer (A) with the cross-linking agent (B) of the hydroxyl group and the copolymerizability with other monomers. A (meth) acrylic acid hydroxyalkyl ester having an alkyl group is preferable. Specifically, for example, 2-hydroxyethyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate and the like are preferable, and 2-hydroxyethyl acrylate or 4-hydroxybutyl acrylate are particularly preferable. Be done. These may be used alone or in combination of two or more.

Examples of the carboxy group-containing monomer include ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, and citraconic acid. Of these, acrylic acid is preferable from the viewpoint of reactivity of the obtained (meth) acrylic acid ester polymer (A) with the cross-linking agent (B) of the carboxy group and copolymerizability with other monomers. These may be used alone or in combination of two or more.

Examples of the amino group-containing monomer include aminoethyl (meth) acrylate and n-butylaminoethyl (meth) acrylate. These may be used alone or in combination of two or more.

The (meth) acrylic acid ester polymer (A) preferably contains a reactive group-containing monomer as a lower limit value of 1% by mass or more, and particularly 5% by mass or more, as a monomer unit constituting the polymer. It is preferable to contain 10% by mass or more, and when the reactive group-containing monomer is a hydroxyl group-containing monomer, it is preferably contained in an amount of 15% by mass or more, particularly preferably 20% by mass or more. .. Further, the (meth) acrylic acid ester polymer (A) preferably contains a reactive group-containing monomer as an upper limit value of 35% by mass or less, particularly 30% by mass or less, as a monomer unit constituting the polymer. It is preferably contained, and more preferably 25% by mass or less. When the (meth) acrylic acid ester polymer (A) contains the reactive group-containing monomer in the above amount as the monomer unit, a good crosslinked structure is formed in the obtained pressure-sensitive adhesive, and a desired cohesive force can be obtained. Further, the dispersibility of the colorant (C) in the pressure-sensitive adhesive tends to be good, and the obtained pressure-sensitive adhesive has good reproducibility and uniformity of the above-mentioned optical physical properties, and satisfies the above-mentioned color difference ΔE. It will be easier. Further, when the reactive group-containing monomer is a hydroxyl group-containing monomer, if the content is 15% by mass or more, a predetermined amount of hydroxyl groups remains in the pressure-sensitive adhesive. Hydroxyl groups are hydrophilic groups, and when such hydrophilic groups are present in a predetermined amount of the pressure-sensitive adhesive, even if the pressure-sensitive adhesive is placed under high-temperature and high-humidity conditions, it penetrates into the pressure-sensitive adhesive under the high-temperature and high-humidity conditions. It has good compatibility with the water content, and as a result, whitening of the adhesive when returned to normal temperature and humidity is suppressed (excellent in moisture-heat whitening resistance).

Further, it is also preferable that the (meth) acrylic acid ester polymer (A) does not contain a carboxy group-containing monomer as a monomer unit constituting the polymer. Since the carboxy group is an acid component, since the carboxy group-containing monomer is not contained, a transparent conductive film such as tin-doped indium oxide (ITO) or a metal film, which causes a problem due to the acid, is attached to the adhesive. Even if it exists, those defects (corrosion, change in resistance value, etc.) due to acid can be suppressed. However, it is permissible to contain a predetermined amount of the carboxy group-containing monomer so as not to cause such a problem. Specifically, in the (meth) acrylic acid ester polymer (A), the carboxy group-containing monomer is contained in an amount of 0.1% by mass or less, preferably 0.01% by mass or less, more preferably 0.001 as a monomer unit. It is permissible to contain in an amount of mass% or less.

The (meth) acrylic acid ester polymer (A) preferably contains a (meth) acrylic acid alkyl ester as a monomer unit constituting the polymer. Thereby, good adhesiveness can be exhibited. The alkyl group may be linear or branched chain.

As the (meth) acrylic acid alkyl ester, a (meth) acrylic acid alkyl ester having an alkyl group having 1 to 20 carbon atoms is preferable from the viewpoint of adhesiveness. Examples of the (meth) acrylic acid alkyl ester having an alkyl group having 1 to 20 carbon atoms include methyl (meth) acrylic acid, ethyl (meth) acrylic acid, propyl (meth) acrylic acid, and n- (meth) acrylic acid. Butyl, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, n-decyl (meth) acrylate, (meth) acrylate Examples thereof include n-dodecyl, myristyl (meth) acrylate, palmityl (meth) acrylate, and stearyl (meth) acrylate. Among them, (meth) acrylic acid ester having 1 to 8 carbon atoms of the alkyl group is preferable from the viewpoint of further improving the adhesiveness, and methyl (meth) acrylate, n-butyl (meth) acrylate or (meth) acrylic. 2-Ethylhexyl acid is particularly preferred, and methyl methacrylate, n-butyl acrylate or 2-ethylhexyl acrylate is even more preferred. These may be used alone or in combination of two or more.

The (meth) acrylic acid ester polymer (A) preferably contains (meth) acrylic acid alkyl ester in an amount of 40% by mass or more, and particularly 50% by mass or more, as a monomer unit constituting the polymer. It is preferable, and it is preferable that the content is 60% by mass or more. When the lower limit of the content of the (meth) acrylic acid alkyl ester is as described above, the (meth) acrylic acid ester polymer (A) can exhibit suitable adhesiveness. Further, the dispersibility of the colorant (C) in the adhesive tends to be good, and the (meth) acrylic acid ester polymer (A) is suppressed from impairing the desired adhesiveness. As a result, the obtained pressure-sensitive adhesive can exhibit suitable stickiness, and the reproducibility and uniformity of the above-mentioned optical physical characteristics are improved, so that the above-mentioned color difference ΔE can be easily satisfied. Further, the (meth) acrylic acid ester polymer (A) preferably contains 99% by mass or less of the (meth) acrylic acid alkyl ester as a monomer unit constituting the polymer, and preferably contains 95% by mass or less. Is more preferable, and in particular, it is preferably contained in an amount of 90% by mass or less, more preferably 85% by mass or less, and most preferably 80% by mass or less. When the upper limit of the content of the (meth) acrylic acid alkyl ester is as described above, a suitable amount of another monomer component such as a reactive functional group-containing monomer is introduced into the (meth) acrylic acid ester polymer (A). be able to.

The (meth) acrylic acid ester polymer (A) preferably contains a monomer having an alicyclic structure in the molecule (alicyclic structure-containing monomer) as a monomer unit constituting the polymer. Since the alicyclic structure-containing monomer is bulky, it is presumed that the presence of the monomer in the polymer widens the distance between the polymers, and the obtained adhesive can be made excellent in flexibility. .. As a result, the adhesive has excellent step followability.

The alicyclic structure carbon ring in the alicyclic structure-containing monomer may have a saturated structure or may have an unsaturated bond as a part. Further, the alicyclic structure may be a monocyclic alicyclic structure or a polycyclic alicyclic structure such as two rings or three rings. From the viewpoint of making the distance between the obtained (meth) acrylic acid ester polymers (A) appropriate and imparting high stress relaxation property to the pressure-sensitive adhesive, the alicyclic structure is a polycyclic alicyclic structure. Polycyclic structure) is preferable. Further, in consideration of the compatibility between the (meth) acrylic acid ester polymer (A) and other components, the polycyclic structure is particularly preferably bicyclic to tetracyclic. Further, from the viewpoint of imparting stress relaxation property as described above, the number of carbon atoms in the alicyclic structure (referring to the total number of carbon atoms in the portion forming the ring, and when a plurality of rings exist independently) , The total number of carbon atoms) is usually preferably 5 or more, and particularly preferably 7 or more. On the other hand, the upper limit of the number of carbon atoms in the alicyclic structure is not particularly limited, but from the viewpoint of compatibility as described above, it is preferably 15 or less, and particularly preferably 10 or less.

Specific examples of the alicyclic structure-containing monomer include cyclohexyl (meth) acrylate, dicyclopentanyl (meth) acrylate, adamantyl (meth) acrylate, isobornyl (meth) acrylate, and (meth) acrylic. Dicyclopentenyl acid, dicyclopentenyloxyethyl (meth) acrylate, etc., among others, dicyclopentanyl (meth) acrylate (carbon number of alicyclic structure:) which exhibits better step followability: 10), adamantyl (meth) acrylate (carbon number of alicyclic structure: 10) or isobornyl (meth) acrylate (carbon number of carbon number of alicyclic structure: 7) is preferable, and isobornyl (meth) acrylate is particularly preferable. Further, isobornyl acrylate is preferable. These may be used individually by 1 type, and may be used in combination of 2 or more type.

When the (meth) acrylic acid ester polymer (A) contains an alicyclic structure-containing monomer as a monomer unit constituting the polymer, it preferably contains 1% by mass or more of the alicyclic structure-containing monomer. In particular, it is preferably contained in an amount of 4% by mass or more, and more preferably 8% by mass or more. Further, the (meth) acrylic acid ester polymer (A) preferably contains 30% by mass or less of an alicyclic structure-containing monomer, and particularly 22% by mass or less, as a monomer unit constituting the polymer. It is preferable that the content is 14% by mass or less. When the content of the alicyclic structure-containing monomer is in the above range, the obtained adhesive has more excellent step-following property and has more excellent adhesive force to plastic.

Further, it is also preferable that the (meth) acrylic acid ester polymer (A) contains a nitrogen atom-containing monomer as a monomer unit constituting the polymer. By allowing a nitrogen atom-containing monomer to be present in the polymer as a constituent unit, a predetermined polarity is imparted to the pressure-sensitive adhesive, and the adhesive has excellent affinity for an adherend having a certain degree of polarity such as glass. Can be. As the nitrogen atom-containing monomer, a monomer having a nitrogen-containing heterocycle is preferable from the viewpoint of imparting appropriate rigidity to the (meth) acrylic acid ester polymer (A). Further, from the viewpoint of increasing the degree of freedom of the portion derived from the nitrogen atom-containing monomer in the higher-order structure of the constituent pressure-sensitive adhesive, the nitrogen atom-containing monomer forms the (meth) acrylic acid ester polymer (A). It is preferable that no reactive unsaturated double bond group is contained other than one polymerizable group used for the polymerization of.

Examples of the monomer having a nitrogen-containing heterocycle include N- (meth) acryloylmorpholin, N-vinyl-2-pyrrolidone, N- (meth) acryloylpyrrolidone, N- (meth) acryloylpiperidin, and N- (meth) acryloyl. Pyrrolidine, N- (meth) acryloyl acryloyl, aziridinyl ethyl (meth) acrylate, 2-vinylpyridine, 4-vinylpyridine, 2-vinylpyrazine, 1-vinylimidazole, N-vinylcarbazole, N-vinylphthalimide, etc. Among them, N- (meth) acryloylmorpholin, which exhibits more excellent adhesive strength, is preferable, and N-acryloylmorpholin is particularly preferable. These may be used individually by 1 type, and may be used in combination of 2 or more type.

When the (meth) acrylic acid ester polymer (A) contains a nitrogen atom-containing monomer as a monomer unit constituting the polymer, the nitrogen atom-containing monomer is preferably contained in an amount of 1% by mass or more, particularly 4% by mass. It is preferably contained in an amount of% or more, and more preferably 8% by mass or more. Further, the (meth) acrylic acid ester polymer (A) preferably contains the nitrogen atom-containing monomer in an amount of 20% by mass or less, particularly 16% by mass or less, as a monomer unit constituting the polymer. It is preferable, and it is preferable that the content is 12% by mass or less. When the content of the nitrogen atom-containing monomer is within the above range, the obtained pressure-sensitive adhesive can sufficiently exert excellent adhesive strength to glass.

If desired, the (meth) acrylic acid ester polymer (A) may contain another monomer as a monomer unit constituting the polymer. As the other monomer, a monomer containing no reactive functional group is preferable so as not to inhibit the above-mentioned action of the reactive functional group-containing monomer. Examples of such monomers include (meth) acrylic acid alkoxyalkyl esters such as methoxyethyl (meth) acrylate and ethoxyethyl (meth) acrylate, vinyl acetate, and styrene. These may be used alone or in combination of two or more.

The (meth) acrylic acid ester polymer (A) is preferably a linear polymer. Since it is a linear polymer, entanglement of molecular chains is likely to occur, and improvement in cohesive force can be expected. Therefore, the obtained adhesive tends to exhibit a suitable gel fraction, adhesive strength, and the like, and tends to have excellent step followability and blister resistance under high temperature and high humidity conditions.

Further, the (meth) acrylic acid ester polymer (A) is preferably a solution polymer obtained by a solution polymerization method. Since it is a solution polymer, it becomes easy to obtain a high molecular weight polymer, and improvement in cohesive force can be expected. Therefore, the obtained adhesive tends to exhibit a suitable gel fraction, adhesive strength, and the like, and tends to have excellent step followability and blister resistance under high temperature and high humidity conditions.

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

The weight average molecular weight of the (meth) acrylic acid ester polymer (A) is preferably 200,000 or more, particularly preferably 300,000 or more, and further preferably 400,000 or more as the lower limit value. From the viewpoint of dispersibility of the colorant (C), it is more preferably 450,000 or more. When the lower limit of the weight average molecular weight of the (meth) acrylic acid ester polymer (A) is the above, the values such as the gel fraction and the adhesive strength of the obtained adhesive tend to be suitable, and under high temperature and high humidity conditions. The step followability and blister resistance in the above are more excellent. Further, the dispersibility of the colorant (C) in the pressure-sensitive adhesive tends to be good, and therefore, the obtained pressure-sensitive adhesive has good reproducibility and uniformity of the above-mentioned optical physical properties, and the above-mentioned color difference. It becomes easy to satisfy ΔE.

The weight average molecular weight of the (meth) acrylic acid ester polymer (A) is preferably 2 million or less, more preferably 1.5 million or less, and particularly preferably 1 million or less, as an upper limit value. Further, it is preferably 800,000 or less, and preferably 650,000 or less from the viewpoint of facilitating the exertion of higher adhesive strength. When the upper limit of the weight average molecular weight of the (meth) acrylic acid ester polymer (A) is as described above, the gel fraction and the like of the obtained adhesive are likely to be suitable, and the initial step followability is more excellent. It becomes a thing. The weight average molecular weight in the present specification is a standard polystyrene-equivalent value measured by a gel permeation chromatography (GPC) method.

In the adhesive composition P, the (meth) acrylic acid ester polymer (A) may be used alone or in combination of two or more.

(1-2) Crosslinking agent (B)
The cross-linking agent (B) can cross-link the (meth) acrylic acid ester polymer (A) by heating the adhesive composition P to form a three-dimensional network structure satisfactorily. As a result, the cohesive force of the obtained adhesive is improved, and the step followability and blister resistance under high temperature and high humidity conditions are excellent.

The cross-linking agent (B) may be any as long as it reacts with the reactive group of the (meth) acrylic acid ester polymer (A). For example, an isocyanate-based cross-linking agent, an epoxy-based cross-linking agent, and an amine-based cross-linking agent. , Melamine-based cross-linking agent, aziridine-based cross-linking agent, hydrazine-based cross-linking agent, aldehyde-based cross-linking agent, oxazoline-based cross-linking agent, metal alkoxide-based cross-linking agent, metal chelate-based cross-linking agent, metal salt-based cross-linking agent, ammonium salt-based cross-linking agent, etc. Can be mentioned. Among the above, when the reactive group of the (meth) acrylic acid ester polymer (A) is a hydroxyl group, it is preferable to use an isocyanate-based cross-linking agent having excellent reactivity with the hydroxyl group, and the (meth) acrylic acid ester. When the reactive group of the polymer (A) is a carboxy group, it is preferable to use an epoxy-based cross-linking agent having excellent reactivity with the carboxy group. The cross-linking agent (B) may be used alone or in combination of two or more.

The isocyanate-based cross-linking 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, isophorone diisocyanates, and alicyclic polyisocyanates such as hydrogenated diphenylmethane diisocyanate. , And their biurets, isocyanurates, and adducts, which are reactants with low molecular weight active hydrogen-containing compounds such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, and castor oil. Of these, trimethylolpropane-modified aromatic polyisocyanates, particularly trimethylolpropane-modified tolylene diisocyanate and trimethylolpropane-modified xylylene diisocyanate, are preferable from the viewpoint of reactivity with hydroxyl groups.

Examples of the epoxy-based cross-linking agent include 1,3-bis (N, N-diglycidyl aminomethyl) cyclohexane, N, N, N', N'-tetraglycidyl-m-xylylenediamine, and ethylene glycol diglycidyl ether. , 1,6-Hexanediol diglycidyl ether, trimethylolpropane diglycidyl ether, diglycidyl aniline, diglycidyl amine and the like. Of these, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane is preferable from the viewpoint of reactivity with a carboxy group.

The content of the cross-linking agent (B) in the adhesive composition P is preferably 0.01 part by mass or more with respect to 100 parts by mass of the (meth) acrylic acid ester polymer (A), and in particular, 0. It is preferably 03 parts by mass or more, and more preferably 0.05 parts by mass or more. The content is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, particularly preferably 1 part by mass or less, and further preferably 0.4 parts by mass or less. Is preferable. When the content of the cross-linking agent (B) is within the above range, the obtained adhesive exhibits good cohesive force, and the values such as gel fraction and adhesive force tend to be suitable, and the temperature is high. It is superior in step followability and blister resistance under wet conditions.

(1-3) Colorant (C)
The colorant (C) may be a pigment or a dye. The pigment may be an inorganic pigment or an organic pigment. From the viewpoint of the durability of the obtained pressure-sensitive adhesive, inorganic pigments are preferable. As the color of the colorant, a color having a color difference ΔE within the above-mentioned range is selected, and it is generally preferable to be a dark color or a dark color such as black, brown, navy blue, purple, and blue, and black is particularly preferable.

Examples of inorganic pigments include carbon black, cobalt pigments, iron pigments, chromium pigments, titanium pigments, vanadium pigments, zirconium pigments, molybdenum pigments, ruthenium pigments, platinum pigments, and ITO (indium). Examples thereof include tin oxide) dyes and ATO (antimons tin oxide) dyes.

Examples of organic pigments and organic dyes include aminium pigments, cyanine pigments, merocyanine pigments, croconium pigments, squalium pigments, azulenium pigments, polymethine pigments, naphthoquinone pigments, and pyrylium pigments. Phthalocyanin pigments, naphthalocyanine pigments, naphtholactum pigments, azo pigments, condensed azo pigments, indigo pigments, perinone pigments, perylene pigments, dioxazine pigments, quinacridone pigments, isoindolinone pigments, quinophthalone pigments. Dyes, pyrrole dyes, thioindigo dyes, metal complex dyes (metal complex salt dyes), dithiol metal complex dyes, indolphenol dyes, triallylmethane dyes, anthraquinone dyes, dioxazine dyes, naphthol dyes, azomethine Examples thereof include pigments, benzimidazolone pigments, pyranthron pigments and slene colors.

Examples of the black pigment include carbon black, copper oxide, iron tetraoxide, manganese dioxide, aniline black, activated carbon and the like. Examples of the black dye include high-concentration vegetable dyes and azo dyes.

The above pigments or dyes can be appropriately mixed and used depending on the purpose.

From the viewpoint of the color difference ΔE, among the above colorants, carbon black, niglosin-based black dye, and chromate-based black dye are preferable. The surface of the carbon black may or may not be subjected to a predetermined treatment (for example, a solvent-containing treatment).

In the above colorant, the lower limit of the average haze, which is the average value of the haze value at a wavelength of 780 nm and the haze value at a wavelength of 380 nm, of a solution obtained by diluting the colorant 10,000 times with ethyl acetate is 1% or more. Those having an amount of 2% or more are preferable, and those having an amount of 3% or more are preferable. Further, the colorant preferably has an upper limit of the average haze of 60% or less, preferably 40% or less, particularly preferably 30% or less, and further preferably 20% or less. The one is preferable, and the one with 10% or less is most preferable. By using such a colorant in an appropriate amount, the obtained pressure-sensitive adhesive has good reproducibility and uniformity of the above-mentioned optical physical properties, and can easily satisfy the above-mentioned color difference ΔE.

Further, the colorant preferably has a difference value between the haze value at a wavelength of 780 nm and the haze value at a wavelength of 380 nm of a solution obtained by diluting the colorant 10,000 times with ethyl acetate at 30 points or less. Those having 25 points or less are more preferable, those having 20 points or less are preferable, those having 16 points or less are preferable, and those having 10 points or less are most preferable. By using such a colorant in an appropriate amount, the obtained pressure-sensitive adhesive has good reproducibility and uniformity of the above-mentioned optical physical properties, and can easily satisfy the above-mentioned color difference ΔE.

The lower limit of the difference between the haze values may be 0 points, but it should be 0.1 points or more from the viewpoint of facilitating the adjustment of the optical properties of the pressure-sensitive adhesive layer 11 to a suitable one. Is more preferable, 0.5 points or more is more preferable, 1 point or more is particularly preferable, and 3 points or more is further preferable.

The haze value of the solution obtained by diluting the colorant 10,000 times with ethyl acetate at a wavelength of 780 nm is preferably 0.1 to 50%, more preferably 0.5 to 40%, and particularly 1 to 1. It is preferably 30%, more preferably 1.5 to 20%, and most preferably 2 to 10%. The haze value of the solution obtained by diluting the colorant 10,000 times with ethyl acetate at a wavelength of 380 nm is preferably 1 to 60%, more preferably 3 to 50%, and particularly 6 to 40%. It is preferably, more preferably 8 to 30%, and most preferably 10 to 20%. This makes it easier to satisfy the difference between the haze values.

Further, a standard haze value of the above-mentioned colorant diluted 10,000 times with ethyl acetate at each wavelength of 5 nm pitch in the wavelength region of 380 nm to 780 nm (that is, 380 nm, 385 nm, 390 nm, ..., 775 nm, 780 nm). The deviation is preferably 10 or less, more preferably 8 or less, particularly preferably 5 or less, and further preferably 2 or less. The lower limit of the standard deviation is most preferably 0, but usually 0.1 or more, particularly preferably 0.5 or more, and further preferably 1 or more. .. As a result, the obtained pressure-sensitive adhesive has good reproducibility and uniformity of the above-mentioned optical physical properties, and can easily satisfy the above-mentioned color difference ΔE.

The content of the colorant (C) in the adhesive composition P is preferably 0.001 part by mass or more, preferably 0.005 part by mass, based on 100 parts by mass of the (meth) acrylic acid ester polymer (A). It is more preferably parts by mass or more, particularly preferably 0.01 parts by mass or more, further preferably 0.02 parts by mass or more, and most preferably 0.03 parts by mass or more. When the lower limit value of the content of the colorant (C) is the above, the value of the total light transmittance described above can be adjusted to a predetermined degree lower, and the color difference ΔE described above can be easily satisfied. The content is preferably 1.3 parts by mass or less, more preferably 1.0 part by mass or less, particularly preferably 0.4 parts by mass or less, and further preferably 0.3 parts by mass. It is preferably 0 parts by mass or less, and most preferably 0.15 parts by mass or less. When the upper limit of the content of the colorant (C) is as described above, the obtained pressure-sensitive adhesive tends to exhibit suitable optical physical properties, and the above-mentioned color difference ΔE and the above-mentioned total light transmittance are more likely to be satisfied. ..

(1-4) Active energy ray-curable component (D)
In a pressure-sensitive adhesive obtained by cross-linking the pressure-sensitive adhesive composition P with active energy ray-curable, the active energy ray-curable components (D) are polymerized with each other, and the polymerized active energy ray-curable component (D) is produced. It is presumed that the (meth) acrylic acid ester polymer (A) is entangled in the crosslinked structure (three-dimensional network structure). The pressure-sensitive adhesive having such a high-order structure exhibits extremely excellent durability, and is particularly excellent in step followability and blister resistance under high temperature and high humidity conditions.

The active energy ray-curable component (D) is not particularly limited as long as it is a component that is cured by irradiation with active energy rays and obtains the above effects, and may be any monomer, oligomer or polymer, and they may be used. May be a mixture of. Among them, a polyfunctional acrylate-based monomer having excellent blister resistance can be preferably mentioned.

Examples of the polyfunctional acrylate-based monomer include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, and polyethylene glycol di (meth) acrylate. , Neopentyl glycol adipate di (meth) acrylate, neopentyl glycol di (meth) acrylate of hydroxypivalate, dicyclopentanyl di (meth) acrylate, tricyclodecanedimethanol (meth) acrylate, caprolactone-modified dicyclopentenyldi ( Meta) acrylate, ethylene oxide modified di (meth) acrylate, di (acryloxyethyl) isocyanurate, allylated cyclohexyl di (meth) acrylate, ethoxylated bisphenol A diacrylate, 9,9-bis [4- (2- (2-) Bifunctional type such as acryloyloxyethoxy) phenyl] fluorene; trimethylpropantri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid-modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri (meth) acrylate , Protinoxide-modified trimethylolpropane tri (meth) acrylate, tris (acryloxyethyl) isocyanurate, ε-caprolactone-modified tris- (2- (meth) acryloxyethyl) isocyanurate, etc. Four-functional types such as meta) acrylate and pentaerythritol tetra (meth) acrylate; pentafunctional type such as propionic acid-modified dipentaerythritol penta (meth) acrylate; dipentaerythritol hexa (meth) acrylate and caprolactone-modified dipentaerythritol hexa ( Examples thereof include a hexafunctional type such as meta) acrylate. These may be used individually by 1 type, and may be used in combination of 2 or more type. Further, from the viewpoint of compatibility with the (meth) acrylic acid ester polymer (A), the polyfunctional acrylate-based monomer preferably has a molecular weight of less than 1000.

Among the above, from the viewpoint of the blister resistance of the obtained adhesive, di (acryloxyethyl) isocyanurate, tris (acryloxyethyl) isocyanurate, ε-caprolactone-modified tris- (2- (meth) acryloxyethyl). A polyfunctional acrylate-based monomer having an isocyanurate structure in the molecule such as isocyanurate, or a polyfunctional acrylate-based monomer having a cyclic structure (particularly a cycloalkane structure) in the molecule such as tricyclodecanedimethanol (meth) acrylate. Is preferable, a polyfunctional acrylate-based monomer having a trifunctionality or higher and containing an isocyanurate structure in the molecule, or a polyfunctional acrylate-based monomer having a bifunctionality or higher and having a polycyclic structure (particularly a cycloalkane polycyclic structure) in the molecule. Functional acrylate-based monomers are more preferred, ε-caprolactone-modified tris- (2- (meth) acryloxiethyl) isocyanurate or tricyclodecanedimethanol (meth) acrylate is particularly preferred, and ε-caprolactone-modified tris- (2-acrylate). Loxyethyl) isocyanurate or tricyclodecanedimethanol acrylate is more preferred, and ε-caprolactone-modified tris- (2-acryloxyethyl) isocyanurate is most preferred.

The content of the active energy ray-curable component (D) in the adhesive composition P is 1 part by mass or more as a lower limit value with respect to 100 parts by mass of the (meth) acrylic acid ester polymer (A). It is preferably 3 parts by mass or more, more preferably 4 parts by mass or more. On the other hand, the content is preferably 20 parts by mass or less, particularly preferably 12 parts by mass or less, and 10 parts by mass or less as an upper limit value from the viewpoint of the adhesive force of the pressure-sensitive adhesive after the active energy ray curing. It is more preferable that the amount is 9 parts by mass or less from the viewpoint of facilitating the exertion of higher adhesive force. When the content of the active energy ray-curable component (D) is within the above range, the pressure-sensitive adhesive after the active energy ray-curing tends to have suitable values such as gel fraction and adhesive strength, and is high in temperature. It is superior in step followability and blister resistance under wet conditions.

(1-5) Photopolymerization Initiator (E)
When ultraviolet rays are used as the active energy rays for curing the adhesive composition P, the adhesive composition P preferably further contains a photopolymerization initiator (E). By containing the photopolymerization initiator (E) in this way, the active energy ray-curable component (D) can be efficiently polymerized, and the polymerization curing time and the irradiation amount of the active energy rays can be reduced. can.

Examples of such a photopolymerization initiator (E) include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, and 2,2-dimethoxy. -2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexylphenylketone, 2-methyl-1- [4- (Methylthio) phenyl] -2-morpholino-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2- (hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4'-diethylamino Benzophenone, Dichlorobenzophenone, 2-Methylanthraquinone, 2-Ethylanthraquinone, 2-Turrary-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, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide and the like. These may be used alone or in combination of two or more.

The content of the photopolymerization initiator (E) in the adhesive composition P is preferably 0.1 part by mass or more as a lower limit value with respect to 100 parts by mass of the active energy ray-curable component (D). In particular, it is preferably 1 part by mass or more, and more preferably 5 parts by mass or more. Further, the upper limit value is preferably 30 parts by mass or less, particularly preferably 20 parts by mass or less, and further preferably 12 parts by mass or less.

(1-6) Various Additives The adhesive composition P contains various additives usually used for acrylic pressure-sensitive adhesives, such as silane coupling agents, rust preventives, ultraviolet absorbers, and antistatic agents, if desired. , Adhesives, antioxidants, light stabilizers, softeners, refractive index adjusters and the like can be added. The polymerization solvent and the diluting solvent described later are not included in the additives constituting the adhesive composition P.

The adhesive composition P preferably contains a silane coupling agent among the above. As a result, regardless of whether the adherend is a plastic plate or a glass member, the adhesion to the adherend is improved, and the step followability and blister resistance under high temperature and high humidity conditions are more excellent. It becomes a thing.

The silane coupling agent is an organosilicon compound having at least one alkoxysilyl group in the molecule, which has good compatibility with the (meth) acrylic acid ester polymer (A) and has light transmittance. preferable.

Examples of such a silane coupling agent include polymerizable unsaturated group-containing silicon compounds such as vinyltrimethoxysilane, vinyltriethoxysilane, and methacrypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, and 2-(. 3,4-Epoxycyclohexyl) Silicon compounds having an epoxy structure such as ethyltrimethoxysilane, mercapto group-containing silicon compounds such as 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, and 3-mercaptopropyldimethoxymethylsilane. , Amino group-containing silicon compounds such as 3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, 3-Chloropropyltrimethoxysilane, 3-isocyanuspropyltriethoxysilane, or at least one of these, and alkyl group-containing silicon compounds such as methyltriethoxysilane, ethyltriethoxysilane, methyltrimethoxysilane, and ethyltrimethoxysilane. Examples thereof include a condensate of. These may be used individually by 1 type, and may be used in combination of 2 or more type.

The content of the silane coupling agent in the adhesive composition P is preferably 0.01 part by mass or more, particularly 0.05 parts by mass, based on 100 parts by mass of the (meth) acrylic acid ester polymer (A). It is preferably 1 part by mass or more, and more preferably 0.1 part by mass or more. The content is preferably 1 part by mass or less, particularly preferably 0.5 part by mass or less, and further preferably 0.3 part by mass or less.

(2) Preparation of Adhesive Composition The adhesive composition P produced a (meth) acrylic acid ester polymer (A), and the obtained (meth) acrylic acid ester polymer (A) and a cross-linking agent ( It can be produced by mixing B) and a colorant (C) and, if desired, adding an active energy ray-curable component (D), a photopolymerization initiator (E), an additive and the like.

The (meth) acrylic acid ester polymer (A) can be produced by polymerizing a mixture of monomers constituting the polymer by a usual radical polymerization method. The polymerization of the (meth) acrylic acid ester polymer (A) is preferably carried out by a solution polymerization method using a polymerization initiator, if desired. However, the present invention is not limited to this, and polymerization may be carried out without a solvent. Examples of the polymerization solvent include ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone and the like, and two or more of them may be used in combination.

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 compound include 2,2'-azobisisobutyronitrile, 2,2'-azobis (2-methylbutyronitrile), 1,1'-azobis (cyclohexane1-carbonitrile), and 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), 2,2'-azobis [2- (2-imidazolin-2-yl)) Propane] and the like.

Examples of the organic peroxide include benzoyl peroxide, t-butyl perbenzoate, cumene hydroperoxide, diisopropyl peroxy dicarbonate, di-n-propyl peroxy dicarbonate, and di (2-ethoxyethyl) peroxy. Examples thereof include dicarbonate, t-butylperoxyneodecanoate, t-butylperoxyvivarate, (3,5,5-trimethylhexanoyl) peroxide, dipropionyl peroxide, diacetyl peroxide and the like.

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

Once the (meth) acrylic acid ester polymer (A) is obtained, the solution of the (meth) acrylic acid ester polymer (A) is mixed with a cross-linking agent (B), a colorant (C), and optionally a diluting solvent and activity. An energy ray-curable component (D), a photopolymerization initiator (E), an additive and the like are added and sufficiently mixed to obtain a solvent-diluted adhesive composition P (coating solution). If any of the above components is in the form of a solid, or if precipitation occurs when the component is mixed with another component in an undiluted state, the component is used alone as a diluting solvent in advance. It may be dissolved or diluted and then mixed with other ingredients.

Examples of the diluting 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, methanol, ethanol, propanol and butanol. Alcohols such as 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 solvents such as ethyl cellosolve are used.

The concentration and viscosity of the coating solution prepared in this manner may be any range as long as it can be coated, and is not particularly limited and can be appropriately selected depending on the situation. For example, the adhesive composition P is diluted so as to have a concentration of 10 to 60% by mass. It should be noted that the addition of a diluting solvent or the like is not a necessary condition when obtaining the coating solution, and the diluting solvent may not be added as long as the adhesive composition P has a coatable viscosity or the like. In this case, the adhesive composition P becomes a coating solution using the polymerization solvent of the (meth) acrylic acid ester polymer (A) as it is as a diluting solvent.

(3) Formation of Adhesive Layer The pressure-sensitive adhesive layer 11 in the present embodiment is preferably made of a pressure-sensitive adhesive obtained by cross-linking the pressure-sensitive adhesive composition P (coating layer). Crosslinking of the adhesive composition P can usually be carried out by heat treatment. In addition, this heat treatment can also serve as a drying treatment when volatilizing the diluting solvent or the like from the coating layer of the adhesive composition P applied to the desired object.

The heating temperature of the heat treatment is preferably 50 to 150 ° C, particularly preferably 70 to 120 ° C. The heating time is preferably 10 seconds to 10 minutes, and particularly preferably 50 seconds to 2 minutes.

After the heat treatment, if necessary, a curing period of about 1 to 2 weeks may be provided at room temperature (for example, 23 ° C., 50% RH). If this curing period is required, the adhesive is formed after the curing period has elapsed, and if the curing period is not required, after the heat treatment is completed.

By the above heat treatment (and curing), the (meth) acrylic acid ester polymer (A) is sufficiently crosslinked via the crosslinking agent (B). The pressure-sensitive adhesive thus obtained can easily satisfy desired values such as gel fraction and adhesive strength, and is excellent in step followability and blister resistance under high temperature and high humidity conditions.

(4) Physical characteristics of adhesive (gel fraction)
The gel fraction of the pressure-sensitive adhesive in the present embodiment is preferably 20% or more, more preferably 25% or more, and particularly preferably 30% or more as the lower limit value. When the lower limit of the gel fraction of the pressure-sensitive adhesive is the above, the cohesive force of the pressure-sensitive adhesive becomes high, and the step followability under high temperature and high humidity conditions becomes more excellent. The gel fraction of the pressure-sensitive adhesive according to the present embodiment is preferably 100% or less, more preferably 90% or less, particularly preferably 80% or less, and further 70% as an upper limit value. % Or less is preferable. When the upper limit of the gel fraction of the pressure-sensitive adhesive is the above, the pressure-sensitive adhesive does not become too hard, and both the initial step-following property and the step-following property after durability are excellent. In addition, good adhesive strength is exhibited, and the adhesiveness with the adherend becomes more excellent. Here, the method for measuring the gel fraction of the pressure-sensitive adhesive is as shown in a test example described later.

In the case of an active energy ray-curable pressure-sensitive adhesive, the gel fraction of the pressure-sensitive adhesive after the active energy ray-curing is preferably 40% or more, more preferably 45% or more, and 50% or more as the lower limit value. Is particularly preferable, and 62% or more is most preferable. The gel fraction is preferably 100% or less, more preferably 95% or less, particularly preferably 90% or less, and further preferably 85% or less as the upper limit value. .. When the gel fraction of the pressure-sensitive adhesive after the active energy ray curing is in the above range, the step followability and the blister resistance under high temperature and high humidity conditions become more excellent. In addition, good adhesive strength is exhibited, and the adhesiveness with the adherend becomes more excellent.

(5) Thickness of Adhesive Layer The thickness of the adhesive layer 11 is preferably 10 μm or more, more preferably 25 μm or more, and particularly preferably 50 μm or more as the lower limit value. When the lower limit of the thickness of the pressure-sensitive adhesive layer 11 is the above, the above-mentioned optical physical characteristics are easily satisfied and the desired adhesive strength is easily exhibited in relation to the content of the colorant (C). Further, from the viewpoint of facilitating the excellent step followability, the lower limit value is preferably 120 μm or more, more preferably 140 μm or more, particularly preferably 160 μm or more, and 180 μm or more. Is even more preferable.

The thickness of the pressure-sensitive adhesive layer 11 is preferably 1000 μm or less, more preferably 500 μm or less, particularly preferably 400 μm or less, and further preferably 300 μm or less as an upper limit value. When the upper limit of the thickness of the pressure-sensitive adhesive layer 11 is the above, the processability becomes good. In addition, appearance defects due to imprints and the like are less likely to occur. Further, the above-mentioned optical physical characteristics are easily satisfied in relation to the content of the colorant (C). The pressure-sensitive adhesive layer 11 may be formed as a single layer, or may be formed by laminating a plurality of layers.

The thickness of the pressure-sensitive adhesive layer 11 on the display body 2 is basically the same as the thickness of the pressure-sensitive adhesive layer 11 of the pressure-sensitive adhesive sheet 1 in the present embodiment.

1-2. Peeling Sheets The peeling sheets 12a and 12b protect the pressure-sensitive adhesive layer 11 until the time when the pressure-sensitive adhesive sheet 1 is used, and are peeled off when the pressure-sensitive adhesive sheet 1 (the pressure-sensitive adhesive layer 11) is used. In the pressure-sensitive adhesive sheet 1 according to the present embodiment, one or both of the release sheets 12a and 12b are not always necessary.

Examples of the release sheets 12a and 12b include polyethylene film, polypropylene film, polybutene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer film, polyethylene terephthalate film, polyethylene naphthalate film, and polybutylene. Telephthalate film, polyurethane film, ethylene vinyl acetate film, ionomer resin film, ethylene / (meth) acrylic acid copolymer film, ethylene / (meth) acrylic acid ester copolymer film, polystyrene film, polycarbonate film, polyimide film, fluorine A resin film or the like is used. In addition, these crosslinked films are also used. Further, these laminated films may be used.

It is preferable that the peeling surfaces (particularly the surfaces in contact with the pressure-sensitive adhesive layer 11) of the peeling sheets 12a and 12b are subjected to a peeling treatment. Examples of the release agent used in the release treatment include alkyd-based, silicone-based, fluorine-based, unsaturated polyester-based, polyolefin-based, and wax-based release agents. Of the release sheets 12a and 12b, it is preferable that one release sheet is a heavy release type release sheet having a large release force and the other release sheet is a light release type release sheet having a small release force.

The thickness of the release sheets 12a and 12b is not particularly limited, but is usually about 20 to 150 μm.

2. Physical Properties (1) Haze Value The haze value of the pressure-sensitive adhesive layer 11 is usually 0% or more, and when the colorant (C) in the pressure-sensitive adhesive layer 11 is a dye, it is preferably 0.01% or more. , 0.05% or more, and particularly preferably 0.1% or more. When the colorant (C) in the pressure-sensitive adhesive layer 11 is a pigment, the haze value of the pressure-sensitive adhesive layer 11 is preferably 0.1% or more, more preferably 0.5% or more. , 1.0% or more, more preferably 1.5% or more, and most preferably 3.0% or more. Since the lower limit of the haze value of the pressure-sensitive adhesive layer 11 is the above, the color difference ΔE described above can be easily satisfied. On the other hand, the haze value of the pressure-sensitive adhesive layer 11 is preferably 80% or less, more preferably 60% or less, particularly preferably 40% or less, and from the viewpoint of visibility, 30% or less. It is preferably present, and most preferably 20% or less. Since the upper limit of the haze value of the pressure-sensitive adhesive layer 11 is the above, the above-mentioned total light transmittance and the color difference ΔE can be easily satisfied. The haze value in the present specification is a value measured according to JIS K7136: 2000.

(2) Adhesive Strength The adhesive strength of the adhesive sheet 1 according to the present embodiment to soda lime glass is preferably 3N / 25mm or more, more preferably 5N / 25mm or more, and 10N / 25mm or more as a lower limit value. Is particularly preferable, and 20 N / 25 mm or more is even more preferable. When the lower limit of the adhesive strength is the above, the step followability and the blister resistance under high temperature and high humidity conditions become more excellent. The adhesive strength of the pressure-sensitive adhesive sheet 1 according to the present embodiment to soda lime glass is preferably 100 N / 25 mm or less, more preferably 90 N / 25 mm or less, and 70 N / 25 mm or less as an upper limit value. Is particularly preferable. When the upper limit value of the adhesive force is the above, good reworkability can be obtained, and when a bonding error occurs, the display body constituent member, particularly an expensive display body constituent member can be reused.

Here, the adhesive strength in the present specification basically refers to the adhesive strength measured by the 180-degree peeling method according to JIS Z0237: 2009, but the measurement sample is 25 mm wide and 100 mm long, and the measured sample is used. It is attached to an adherend, pressurized at 0.5 MPa and 50 ° C. for 20 minutes, left at normal pressure, 23 ° C. and 50% RH for 24 hours, and then measured at a peeling speed of 300 mm / min. It shall be. In the case of an active energy ray-curable pressure-sensitive adhesive, it is assumed that the pressure is the adhesive strength of the active energy ray-cured pressure-sensitive adhesive layer after the adherend is attached.

3. 3. Production of Adhesive Sheet As an example of production of the adhesive sheet 1, the coating solution of the adhesive composition P is applied to the peeling surface of one of the release sheets 12a (or 12b) and heat-treated to perform the adhesive composition. After P is thermally crosslinked to form a coating layer, the peeling surface of the other release sheet 12b (or 12a) is superposed on the coating layer. When the curing period is required, the curing period is set, and when the curing period is not required, the coating layer becomes the adhesive layer 11 as it is. As a result, the adhesive sheet 1 is obtained. The conditions for heat treatment and curing are as described above.

As another production example of the pressure-sensitive adhesive sheet 1, the coating solution of the pressure-sensitive adhesive composition P is applied to the peel-off surface of one of the release sheets 12a, and heat treatment is performed to thermally crosslink the pressure-sensitive adhesive composition P and apply the pressure-sensitive adhesive composition P. A layer is formed to obtain a release sheet 12a with a coating layer. Further, the coating solution of the adhesive composition P is applied to the peeling surface of the other release sheet 12b, heat treatment is performed to thermally crosslink the adhesive composition P to form a coating layer, and the coating layer is attached. To obtain the release sheet 12b of. Then, the release sheet 12a with the coating layer and the release sheet 12b with the coating layer are bonded so that both coating layers are in contact with each other. Here, a plurality of release sheets with a coating layer may be prepared, and a desired number of the coating layers may be bonded together. When the curing period is required, the curing period is set, and when the curing period is not required, the laminated coating layer becomes the pressure-sensitive adhesive layer 11. As a result, the adhesive sheet 1 is obtained. According to this production example, stable production is possible even when the pressure-sensitive adhesive layer 11 is thick.

As a method of applying the coating solution of the adhesive composition P, for example, a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method, a gravure coating method and the like can be used.

[Manufacturing of display body]
In order to manufacture the display body 2, as an example, one of the release sheets 12a of the pressure-sensitive adhesive sheet 1 is peeled off, and the exposed pressure-sensitive adhesive layer 11 of the pressure-sensitive adhesive sheet 1 is separated from the printed layer of the first display body component 21. It is affixed to the surface on the side where 3 exists.

After that, the other release sheet 12b is peeled from the pressure-sensitive adhesive layer 11 of the pressure-sensitive adhesive sheet 1, and the exposed pressure-sensitive adhesive layer 11 of the pressure-sensitive adhesive sheet 1 and the second display body constituent member 22 are bonded together. Further, as another example, the bonding order of the first display body constituent member 21 and the second display body constituent member 22 may be changed.

When the pressure-sensitive adhesive layer 11 is inactive energy ray-curable, after the first display body component 21 and the second display body component 22 are bonded to each other via the pressure-sensitive adhesive layer 11 as described above, The pressure-sensitive adhesive layer 11 is irradiated with active energy rays. As a result, the energy ray-curable component (C) in the pressure-sensitive adhesive layer 11 is polymerized, and the pressure-sensitive adhesive layer 11 is cured. Irradiation of the pressure-sensitive adhesive layer 11 with energy rays is usually performed through either the first display body component 21 or the second display body component 22, preferably the first display body as a protective panel. This is done through the component 21.

The active energy ray refers to an electromagnetic wave or a charged particle beam having an energy quantum, and specific examples thereof include ultraviolet rays and electron beams. Among the active energy rays, ultraviolet rays, which are easy to handle, are particularly preferable.

Irradiation of ultraviolet rays, a high-pressure mercury lamp, a fusion H lamp, can be carried out by a xenon lamp or the like, the dose of ultraviolet ray is preferably illuminance is 50~1000mW / cm ² approximately, 100~500mW / cm ² of about Is preferable. Further, the light quantity is preferably 50~10000mJ / cm ^2, more preferably 200~7000mJ / cm ^2, and particularly preferably 500~3000mJ / cm ^2. On the other hand, the irradiation of the electron beam can be performed by an electron beam accelerator or the like, and the irradiation amount of the electron beam is preferably about 10 to 1000 grad.

The display body 2 having the pressure-sensitive adhesive layer 11 cured by irradiation with active energy rays as described above exhibits excellent blister resistance. For example, the display body 2 is placed under high temperature and high humidity conditions (for example, 85 ° C., 85% RH), and outgas is generated from the first display body component 21 and / or the second display body component 22. Even in this case, the generation of blister such as air bubbles, floating, and peeling at the interface between the pressure-sensitive adhesive layer 11 and the display body constituent members 21 and 22 is suppressed.

Further, in the display body 2, when the pressure-sensitive adhesive layer 11 is formed from the pressure-sensitive adhesive composition P, the pressure-sensitive adhesive layer 11 is excellent in step-following property under high temperature and high humidity conditions. Therefore, even when the display body 2 is placed under high temperature and high humidity conditions (for example, 85 ° C., 85% RH), it is possible to prevent bubbles, floats, peeling, and the like from occurring in the vicinity of the step.

[Other display objects]
A display body according to another embodiment of the present invention is shown in FIG. The display body 2A according to the embodiment of FIG. 3 has the same configuration as the display body 2 described above, but the pressure-sensitive adhesive layer 11 is a laminate of the colored pressure-sensitive adhesive layer 111 and the colorless pressure-sensitive adhesive layer 112. .. The colorless pressure-sensitive adhesive layer 112 is located on the side of the first display body component 21 that comes into contact with the printing layer 3 as a convex portion.

The colored pressure-sensitive adhesive layer 111 is the same as the pressure-sensitive adhesive layer 11 of the display body 2 described above, and is colored by the colorant. On the other hand, the colorless pressure-sensitive adhesive layer 112 is preferably colorless and transparent without being colored by a colorant.

If the colored pressure-sensitive adhesive layer 111 is positioned on the side of the first display body component 21 in contact with the printed layer 3, the colored pressure-sensitive adhesive layer 111 may be compressed due to the unevenness of the printing layer 3. It transforms. As a result, the color of the colored pressure-sensitive adhesive layer 111 may be shaded, and the transmittance may be uneven. For example, in the portion where the colored pressure-sensitive adhesive layer 111 is compressed, the color may become darker and the transmittance may decrease. On the other hand, as described above, by forming the layer in contact with the print layer 3 in the first display body constituent member 21 as the colorless pressure-sensitive adhesive layer 112, the colored pressure-sensitive adhesive layer 111 is caused by the unevenness caused by the print layer 3. Is suppressed from being compressed or deformed. As a result, unevenness in the transmittance in the pressure-sensitive adhesive layer 11 can be suppressed, the appearance quality of the display body can be improved, and the designability can be further improved.

The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

For example, either or both of the release sheets 12a and 12b in the pressure-sensitive adhesive sheet 1 may be omitted, and desired optical members may be laminated in place of the release sheets 12a and / or 12b. Further, the first display body constituent member 21 may not have the print layer 3. In this case, the display body 2 may have a frame material such as black on the peripheral edge portion as an example.

Hereinafter, the present invention will be described in more detail with reference to Examples and the like, but the scope of the present invention is not limited to these Examples and the like.

[Example 1]
1. 1. Preparation of (meth) Acrylic Acid Ester Polymer 60 parts by mass of 2-ethylhexyl acrylate, 10 parts by mass of isobornyl acrylate, 10 parts by mass of N-acryloyl morpholine, and 20 parts by mass of 2-hydroxyethyl acrylate are copolymerized by a solution polymerization method. It was polymerized to prepare a (meth) acrylic acid ester polymer (A). When the molecular weight of this (meth) acrylic acid ester polymer (A) was measured by the method described later, the weight average molecular weight (Mw) was 500,000.

2. Preparation of Adhesive Composition 100 parts by mass (solid content conversion value; the same applies hereinafter) of the (meth) acrylic acid ester polymer (A) obtained in the above step 1 and trimethylolpropane-modified bird as a cross-linking agent (B). 0.2 parts by mass of range isocyanate (manufactured by Toyochem Co., Ltd., product name "BHS8515"), 0.04 parts by mass of carbon black black pigment (C1) as a colorant (C), and an active energy ray-curable component (D). ) As ε-caprolactone-modified tris- (2-acryloxyethyl) isocyanurate (D1; manufactured by Shin-Nakamura Chemical Co., Ltd., product name "NK ester A-9300-1CL") 5.0 parts by mass and a photopolymerization initiator. 0.5 parts by mass of a mixture of 1-hydroxycyclohexylphenyl ketone and benzophenone as (E) in a mass ratio of 1: 1 and 0.2 parts by mass of 3-glycidoxypropyltrimethoxysilane as a silane coupling agent. Was mixed, stirred well, and diluted with methyl ethyl ketone to obtain a coating solution of the adhesive composition.

Here, Table 1 shows each formulation (solid content conversion value) of the adhesive composition when the (meth) acrylic acid ester polymer (A) is 100 parts by mass (solid content conversion value). Details of the abbreviations and the like shown in Table 1 are as follows.
[(Meta) acrylic acid ester polymer (A)]
2EHA: 2-ethylhexyl acrylate IBXA: isobornyl acrylate ACMO: N-acryloylmorpholin HEA: 2-hydroxyethyl acrylate MMA: methyl methacrylate BA: n-butyl acrylate AA: acrylic acid
[Crosslinking agent (B)]
TDI: Trimethylolpropane-modified tolylene diisocyanate (manufactured by Toyochem, product name "BHS8515")
XDI: Trimethylolpropane-modified xylylene diisocyanate (manufactured by Soken Chemical Co., Ltd., product name "TD-75")
Epoxy: 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane (manufactured by Mitsubishi Gas Chemical Company, product name "TETRAD-C")
[Colorant (C)]
C1 to C2: Carbon black black pigment having the physical characteristics shown in Table 2.
[Active energy ray-curable component (D)]
D1: ε-caprolactone-modified tris- (2-acryloxyethyl) isocyanurate (manufactured by Shin-Nakamura Chemical Co., Ltd., product name "NK ester A-9300-1CL")
D2: Tricyclodecanedimethanol diacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., product name "NK ester A-DCP")

A haze meter (manufactured by Nippon Denshoku Kogyo Co., Ltd., product name "SH-7000", optical path length 10 mm) was used for a solution obtained by diluting the C1 to C2 colorants 10,000 times with ethyl acetate according to JIS K7136: 2000. The haze value (%) was measured. From the measured values, the difference between the haze value at the wavelength of 780 nm and the haze value at the wavelength of 380 nm, the average haze which is the average value of the haze value at the wavelength of 780 nm and the haze value at the wavelength of 380 nm, and the 5 nm pitch in the wavelength region of 380 nm to 780 nm. The standard deviation of the haze value at each wavelength of was calculated. The results of each are shown in Table 2.

3. 3. Manufacture of Adhesive Sheet A heavy release type release sheet (manufactured by Lintec Corporation, product name "SP-PET752150") in which one side of a polyethylene terephthalate film is peeled off with a silicone-based release agent from the coating solution of the adhesive composition obtained in the above step 2. ”) Was applied to the peeled surface with a knife coater. Then, the coating layer was heat-treated at 90 ° C. for 1 minute to form a coating layer (thickness: 50 μm), thereby producing a heavy peeling type release sheet with a coating layer.

On the other hand, a light peeling type release sheet (manufactured by Lintec Corporation, product name "SP-PET382120") obtained by peeling one side of a polyethylene terephthalate film with a silicone-based release agent from the coating solution of the adhesive composition obtained in the above step 2. It was applied to the peeled surface of the above with a knife coater. Then, the coated layer was heat-treated at 90 ° C. for 1 minute to form a coated layer (thickness: 50 μm), thereby producing four lightly peelable release sheets with the coated layer.

The surface on the coating layer side of the heavy peeling type release sheet with the coating layer obtained above and the surface on the coating layer side in one of the light peeling type release sheets with the coating layer obtained above are attached. In combination, a coating layer having a thickness of 100 μm was obtained as a first laminate sandwiched between the heavy-release type release sheet and the light-release type release sheet.

Next, the light release type release sheet is peeled off from the first laminate, and the exposed surface of the exposed coating layer and the coating layer in one of the light release type release sheets with the coating layer obtained above. The side surfaces were bonded to each other to obtain a second laminate in which a coating layer having a thickness of 150 μm was sandwiched between a heavy peeling type peeling sheet and a light peeling type peeling sheet. By repeating the same steps as this, a fourth laminated body in which the coating layer having a thickness of 250 μm was sandwiched between the heavy release type release sheet and the light release type release sheet was obtained.

Then, the fourth laminate is cured under the conditions of 23 ° C. and 50% RH for 7 days to form a heavy release type release sheet / adhesive layer (thickness: 250 μm) / light release type release sheet. An adhesive sheet made of was manufactured.

The thickness of the pressure-sensitive adhesive layer is a value measured using a constant pressure thickness measuring device (manufactured by Teclock Co., Ltd., product name "PG-02") in accordance with JIS K7130.

[Examples 2 to 11, Comparative Examples 1 to 2]
Types and proportions of each monomer constituting the (meth) acrylic acid ester polymer (A), weight average molecular weight (Mw) of the (meth) acrylic acid ester polymer (A), type and blending amount of the cross-linking agent (B). , Type and amount of colorant (C), type and amount of active energy ray-curable component (D), amount of photopolymerization initiator (E), amount of silane coupling agent, and pressure-sensitive adhesive layer. An adhesive sheet was produced in the same manner as in Example 1 except that the thickness of the adhesive sheet was changed as shown in Table 1. In Examples 6, 10 and 11, the thickness of the pressure-sensitive adhesive layer was changed by changing the thickness and the number of layers of the pressure-sensitive adhesive layer formed on the release sheet.

The above-mentioned weight average molecular weight (Mw) is a polystyrene-equivalent weight average molecular weight measured under the following conditions (GPC measurement) using gel permeation chromatography (GPC).
<Measurement conditions>
-GPC measuring device: HLC-8020 manufactured by Tosoh Corporation
-GPC column (passed in the following order): TSK guard volume HXL-H manufactured by Tosoh Corporation
TSK gel GMHXL (x2)
TSK gel G2000HXL
-Measurement solvent: tetrahydrofuran-Measurement temperature: 40 ° C

[Test Example 1] (Measurement of gel fraction)
The adhesive sheets obtained in Examples and Comparative Examples were cut into a size of 80 mm × 80 mm, the adhesive layer was wrapped in a polyester mesh (mesh size 200), the mass was weighed with a precision balance, and the above mesh was used. The mass of the pressure-sensitive adhesive alone was calculated by subtracting the mass of a single substance. The mass at this time is M1.

Next, the pressure-sensitive adhesive wrapped in the polyester mesh was immersed in ethyl acetate at room temperature (23 ° C.) for 24 hours. Then, the adhesive was taken out, air-dried for 24 hours in an environment of a temperature of 23 ° C. and a relative humidity of 50%, and further dried in an oven at 80 ° C. for 12 hours. After drying, the mass was weighed with 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 is M2. The gel fraction (%) is represented by (M2 / M1) × 100. As a result, the gel fraction of the pressure-sensitive adhesive (before UV irradiation) was derived. The results are shown in Table 3.

On the other hand, the pressure-sensitive adhesive layers of the pressure-sensitive adhesive sheets obtained in Examples (other than Example 7) and Comparative Examples are irradiated with active energy rays (ultraviolet rays; UV) under the following conditions through the light-release type release sheet. , The pressure-sensitive adhesive layer was cured. For the pressure-sensitive adhesive in this cured pressure-sensitive adhesive layer, the gel fraction (after UV irradiation) was derived in the same manner as above. The results are shown in Table 3.

<Activation energy ray irradiation conditions>
・ Uses high-pressure mercury lamp ・ Illuminance 200mW / cm ² , light intensity 2000mJ / cm ²
・ UV illuminance / photometer uses "UVPF-A1" manufactured by iGraphics.

[Test Example 2] (Measurement of total light transmittance)
The pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples was bonded to glass, and this was used as a measurement sample. After performing background measurement with glass, the above measurement sample is subjected to all light rays using a haze meter (manufactured by Nippon Denshoku Kogyo Co., Ltd., product name "NDH-5000") according to JIS K7361-1: 1997. The transmittance (%) was measured. The results are shown in Table 3.

[Test Example 3] (Measurement of haze value)
For the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples, a haze value (%) using a haze meter (manufactured by Nippon Denshoku Kogyo Co., Ltd., product name "NDH-5000") according to JIS K7136: 2000. ) Was measured. The results are shown in Table 3.

[Test Example 4] (Measurement of L * a * b *)
For the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples, a simultaneous photometric spectroscopic chromaticity meter (manufactured by Nippon Denshoku Kogyo Co., Ltd., product name "SQ2000") was used, and CIE1976L * a * was used for transmitted light. The lightness L * (L * 1), the chromaticity a * (a * 1), and the chromaticity b * (b * 1) defined by the b * color system were measured. The results are shown in Table 3.

On the surface of the first glass plate (manufactured by NSG Precision Co., Ltd., product name "Corning Glass Eagle XG", length 90 mm x width 50 mm x thickness 0.5 mm), UV curable ink (manufactured by Teikoku Inks Co., Ltd., product name "POS-" 911 ink ") was screen-printed in a frame shape (outer shape: length 90 mm x width 50 mm, width 5 mm). Next, the printed ultraviolet curable ink is cured by irradiating with ultraviolet rays (80 W / cm ² , 2 metal halide lamps, lamp height 15 cm, belt speed 10 to 15 m / min), and a step (step) due to the printing layer is cured. A glass plate with a printing layer having a height (height: 10 μm) was produced.

Next, the two polarizing plates are passed through a transparent adhesive sheet (manufactured by Lintec Corporation, product name "OPTERIA MO-T015") so that the polarization axes are in a cross Nicol state (polarization axes: ∠45 °, ∠135 °). A first laminate composed of a polarizing plate / a transparent pressure-sensitive adhesive sheet / a polarizing plate was prepared. Further, a second glass plate (manufactured by NSG Precision Co., Ltd., product name "Corning Glass Eagle XG") is interposed on one surface of the polarizing plate via a transparent adhesive sheet (manufactured by Lintec Corporation, product name "OPTERIA MO-T015"). , Length 90 mm x Width 50 mm x Thickness 0.5 mm) were laminated to prepare a second laminate composed of a polarizing plate / transparent adhesive sheet / polarizing plate / transparent adhesive sheet / glass plate. Since the two polarizing plates are arranged in a cross Nicol state, they are in a quenching state.

After cutting the pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples into a length of 90 mm and a width of 50 mm, the light peeling type peeling sheet was peeled off from the pressure-sensitive adhesive sheet, and the exposed pressure-sensitive adhesive layer was obtained from the second laminate obtained above. A third laminate was prepared by laminating on the polarizing plate side of the above. Next, the heavy-release type release sheet was peeled off, and the third laminate was attached to the glass plate with a printing step so that the exposed pressure-sensitive adhesive layer covered the entire surface of the frame-shaped printing layer. Then, the first glass plate was irradiated with active energy rays under the same conditions as in Test Example 1 to cure the pressure-sensitive adhesive layer, which was used as a sample. In Example 7, the active energy rays were not irradiated.

Regarding the non-printed layer portion (corresponding to the display part on the display body) and the printed layer portion (corresponding to the non-display part on the display body) of the sample obtained as described above, a spectrocolorimeter (manufactured by BYK, product name). Using the "Spectrow Guide"), in the reflected light of the incident light from the first glass plate side, the brightness L * (L * 2) of the display unit defined by the CIE1976 L * a * b * color system. , Display chromaticity a * (a * 2) and display chromaticity b * (b * 2), non-display chromaticity L * (L * 3), non-display chromaticity a * ( The chromaticity b * (b * 3) of a * 3) and the non-display portion was measured. The results are shown in Table 3.

From the above results, the color difference ΔE was calculated by the following formula (I). The results are shown in Table 3.

[Test Example 5] (Measurement of adhesive strength)
The light release type release sheet is peeled off from the adhesive sheets obtained in Examples and Comparative Examples, and the exposed adhesive layer is a polyethylene terephthalate (PET) film having an easy adhesive layer (manufactured by Toyo Spinning Co., Ltd., product name "PET A4300"). , Thickness: 100 μm), and a laminated body of a heavy peeling type release sheet / adhesive layer / PET film was obtained. The obtained laminate was cut into a width of 25 mm and a length of 100 mm, and this was used as a sample.

In an environment of 23 ° C. and 50% RH, the heavy-release type release sheet is peeled off from the above sample, the exposed adhesive layer is attached to soda lime glass (manufactured by Nippon Sheet Glass Co., Ltd.), and then the autoclave manufactured by Kurihara Seisakusho Co., Ltd. is used. The pressure was increased at 0.5 MPa and 50 ° C. for 20 minutes. Then, it was left for 24 hours under the condition of 23 ° C. and 50% RH.

Next, the pressure-sensitive adhesive layer was cured by irradiating the heavy-release type release sheet with active energy rays under the same conditions as in Test Example 1. The pressure-sensitive adhesive sheet of Example 7 was not irradiated with active energy rays. Then, using a tensile tester (manufactured by Orientec Co., Ltd., product name "Tencilon"), the adhesive strength (N / 25 mm) was measured under the conditions of a peeling speed of 300 mm / min and a peeling angle of 180 degrees. Conditions other than those described here were measured in accordance with JIS Z0237: 2009. The results are shown in Table 3.

[Test Example 6] (Evaluation of appearance harmony)
In the sample obtained in Test Example 4, whether or not the non-printed layer portion (corresponding to the display portion in the display body) and the printed layer portion (corresponding to the non-display portion in the display body) are familiar (there is a sense of unity). Was visually judged under a three-wavelength fluorescent lamp (distance from the fluorescent lamp: 200 cm), and the appearance harmony was evaluated according to the following criteria. The results are shown in Table 3.
⊚: The non-printed layer part and the printed layer part were very familiar.
◯: The non-printed layer portion and the printed layer portion were familiar to some extent.
X: The non-printed layer portion and the printed layer portion were clearly not familiar.

[Test Example 7] (Evaluation of visibility)
The adhesive sheets obtained in Examples and Comparative Examples were cut into a length of 70 mm × a width of 70 mm, and the adhesive layer of the adhesive sheet was formed into two soda lime glass plates (manufactured by Nippon Sheet Glass Co., Ltd., length 70 mm × width 70 mm × thickness). It was pasted so as to be sandwiched between them (1.1 mm). Next, one of the soda lime glass plates was irradiated with active energy rays under the same conditions as in Test Example 1 to cure the pressure-sensitive adhesive layer, which was used as a sample. In Example 7, the active energy rays were not irradiated.

On the other hand, on a display with a size of 15.6 inches and a resolution of 1366 x 768 (manufactured by Fujitsu Limited, product name "LITEBOOK A574 / H"), white background and black characters (font: MS P Gothic) are displayed from 5 points to 20 points. 100% was displayed in the size of (in 1-point increments).

The sample obtained above was placed on the display. Then, at a position 50 cm from the display, the size of the characters visually recognizable was confirmed, and the visibility was evaluated according to the following criteria. The results are shown in Table 3.
⊚: 6-point characters could be visually recognized.
◯: The 6-point character was not completely visible, but the 8-point character was visible.
Δ: The 8-point character was not completely visible, but the 15-point character was visible.
X: The 15-point character could not be visually recognized.

[Test Example 8] (Evaluation of step followability)
On the surface of a glass plate (manufactured by NSG Precision Co., Ltd., product name "Corning Glass Eagle XG", length 90 mm x width 50 mm x thickness 0.5 mm), UV curable ink (manufactured by Teikoku Inks, product name "POS-911 ink") ) Was screen-printed in a frame shape (outer shape: length 90 mm × width 50 mm, width 5 mm). Next, the printed ultraviolet curable ink is cured by irradiating with ultraviolet rays (80 W / cm ² , 2 metal halide lamps, lamp height 15 cm, belt speed 10 to 15 m / min), and a step (step) due to the printing layer is cured. A stepped glass plate having heights (height: 5 μm, 10 μm) was produced.

The light release type release sheet is peeled off from the adhesive sheets obtained in Examples and Comparative Examples, and the exposed adhesive layer is a polyethylene terephthalate (PET) film having an easy adhesive layer (manufactured by Toyobo Co., Ltd., product name "PET A4300", It was bonded to an easy-adhesion layer having a thickness (thickness: 100 μm). Next, the heavy-release type release sheet was peeled off to expose the pressure-sensitive adhesive layer. Then, using a laminator (manufactured by Fujipla, product name "LPD3214"), the laminate was laminated on each stepped glass plate so that the adhesive layer covered the entire surface of the frame-shaped print. Then, it was autoclaved for 20 minutes under the conditions of 50 ° C. and 0.5 MPa, and left at normal pressure at 23 ° C. and 50% RH for 24 hours.

Next, the PET film was irradiated with active energy rays under the same conditions as in Test Example 1 to cure the pressure-sensitive adhesive layer. Subsequently, it was stored for 72 hours under moist heat conditions of 85 ° C. and 85% RH. After that, the step followability was evaluated based on the following criteria. The step followability is judged to be good when the printing step is completely filled with the adhesive layer, and when floating or peeling is observed at the interface between the printing step and the adhesive layer, the printing step is determined. It is judged that it could not follow. In Example 7, the step followability was evaluated in the same manner as described above except that the active energy rays were not irradiated. The results are shown in Table 3.
⊚: Good at a printing step of 10 μm ○: Good at a printing step of 5 μm ×: There is floating and peeling at a printing step of 5 μm

[Test Example 9] (Evaluation of blister resistance)
The light release type release sheet was peeled off from the adhesive sheets obtained in Examples and Comparative Examples, and the exposed adhesive layer was a plastic plate in which a PMMA layer was laminated on a PC plate (manufactured by Mitsubishi Gas Chemical Company, product name "Iupilon Sheet". MR58U ”, thickness: 0.7 mm, containing an ultraviolet absorber) was affixed to the PC plate side to obtain a plastic plate with an adhesive layer.

The heavy-release type release sheet is peeled off from the plastic plate with the adhesive layer obtained above, and the plastic plate is separated from the plastic plate having a size of 70 mm × 150 mm (manufactured by Nippon Sheet Glass Co., Ltd.) through the exposed adhesive layer. , Thickness: 0.7 mm). Then, it was autoclaved for 20 minutes under the conditions of 50 ° C. and 0.5 MPa, and left at normal pressure at 23 ° C. and 50% RH for 24 hours. Next, the pressure-sensitive adhesive layer was irradiated with active energy rays through the plastic plate under the same conditions as in Test Example 1 to cure the pressure-sensitive adhesive layer.

The obtained laminate was stored for 72 hours under high temperature and high humidity conditions of 85 ° C. and 85% RH. Then, the state at the interface between the pressure-sensitive adhesive layer and the adherend (plastic plate, glass plate) was visually confirmed, and the blister resistance was evaluated according to the following criteria. In Example 7, the blister resistance was evaluated in the same manner as above except that the active energy rays were not irradiated. The results are shown in Table 3.
◎… There were no bubbles, floats, or peeling.
○… There was no floating or peeling, and a few bubbles were generated, but it was at a level that was not a problem.
Δ: There was no floating or peeling, but many bubbles were generated.
×… Floating / peeling occurred.

As can be seen from Table 3, the adhesive sheet obtained in the examples was excellent in appearance harmony and visibility. In addition, those using the adhesive sheets obtained in Examples other than Example 11 were also excellent in step followability. Further, those using the adhesive sheets obtained in Examples other than Example 7 were also excellent in blister resistance.

The pressure-sensitive adhesive sheet of the present invention can be suitably used, for example, for bonding a protective panel having a black printing layer and a desired display body constituent member.

1 ... Adhesive sheet 11 ... Adhesive layer 12a, 12b ... Release sheet 2, 2A ... Display 111 ... Colored adhesive layer 112 ... Colorless adhesive layer 21 ... First display body component 22 ... Second display body configuration Member 3 ... Print layer (convex part)

Claims (14)

An adhesive that has a display unit and a non-display unit, and at least adheres one display body component, another display body component, the one display body component, and the other display body component. A display body with layers
The pressure-sensitive adhesive layer is cured by irradiation with active energy rays.
The total light transmittance of the pressure-sensitive adhesive layer in the display unit is 3% or more.
CIE1976 L * a * b * The brightness L * of the display unit is L * 2, the chromaticity a * of the display unit is a * 2, and the chromaticity b * of the display unit is b * 2. Assuming that the brightness L * of the non-display portion is L * 3, the chromaticity a * of the non-display portion is a * 3, and the chromaticity b * of the non-display portion is b * 3, the following The color difference ΔE calculated by the formula (I) is 2.00 or less.

A display body characterized by that. L * 3 of the non-display unit is 0.1 to 50, a * 3 of the non-display unit is -20 to 20, and b * 3 of the non-display unit is -20 to 20. The display body according to claim 1. The display body according to claim 1 or 2, wherein the non-display unit is black. At least one of the one display body component and the other display body component has a convex portion on the surface on the pressure-sensitive adhesive layer side.
The display body according to any one of claims 1 to 3, wherein the convex portion constitutes a part or all of the non-display portion. An adhesive sheet provided with an adhesive layer for adhering one display body component member constituting a display body having a display unit and a non-display unit and another display body component member.
The total light transmittance of the pressure-sensitive adhesive layer is 3% or more.
In the display body obtained by laminating the one display body component and the other display body component by the pressure-sensitive adhesive layer, the display unit defined by the CIE1976L * a * b * color system. The brightness L * of the display unit is L * 2, the chromaticity a * of the display unit is a * 2, the chromaticity b * of the display unit is b * 2, the brightness L * of the non-display unit is L * 3, and the above. When the chromaticity a * of the non-display part is a * 3 and the chromaticity b * of the non-display part is b * 3, the color difference ΔE calculated by the following formula (I) is 2.00 or less. The pressure-sensitive adhesive layer is colored so as to be

Adhesive sheet characterized by that. CIE1976 L * a * b * The brightness L * of the pressure-sensitive adhesive layer is L * 1, the color degree a * of the pressure-sensitive adhesive layer is a * 1, and the color degree b * of the pressure-sensitive adhesive layer is defined by the color system. Is b * 1, L * 1 of the pressure-sensitive adhesive layer is 5 to 95, a * 1 of the pressure-sensitive adhesive layer is -20 to 20, and b * 1 of the pressure-sensitive adhesive layer is −. The adhesive sheet according to claim 5, wherein the pressure is 20 to 20. The pressure-sensitive adhesive sheet according to claim 5 or 6, wherein the haze value of the pressure-sensitive adhesive layer is 0.1% or more and 80% or less. The pressure-sensitive adhesive sheet according to any one of claims 5 to 7, wherein the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer contains a colorant. The pressure-sensitive adhesive sheet according to claim 8, wherein the colorant is a black pigment or dye. Two release sheets and
The pressure-sensitive adhesive sheet according to any one of claims 5 to 9, further comprising the pressure-sensitive adhesive layer sandwiched between the two release sheets so as to be in contact with the peel-off surfaces of the two release sheets. An adhesive that has a display unit and a non-display unit, and at least adheres one display body component, another display body component, the one display body component, and the other display body component. A display body with layers
The pressure-sensitive adhesive layer is the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet according to any one of claims 5 to 10.
A display body characterized by that. L * 3 of the non-display unit is 0.1 to 50, a * 3 of the non-display unit is -20 to 20, and b * 3 of the non-display unit is -20 to 20. The display body according to claim 11. The display body according to claim 11 or 12, wherein the non-display portion is black. At least one of the one display body component and the other display body component has a convex portion on the surface on the pressure-sensitive adhesive layer side.
The convex portion constitutes a part or all of the non-display portion.
The display body according to any one of claims 11 to 13, characterized in that.

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