TWI841760B - Colored adhesive sheet and display body - Google Patents

Abstract

The present invention provides: a colored adhesive sheet capable of improving the style of a display, and a display with improved style. The colored adhesive sheet 1 of the present invention has a colored adhesive layer 11. The colored adhesive layer 11 is defined in accordance with the CIE 1976 L*a*b* colorimetric system. If the brightness L* of one region R1 of the display component is set to L1, the brightness L* of another region R2 is set to L2, the brightness L* of the region R1 where the colored adhesive layer 11 has been deposited is set to L1’, and the brightness L* of the region R2 where the colored adhesive layer 11 has been deposited is set to L2’, the following equations (I) to (IV) are satisfied: ΔL=L1-L2                … (I) ΔL’=L1’-L2’            … (II) ΔL＞0                      … (III) (ΔL’/ΔL)×100≦80  … (IV)

Description

Colored adhesive sheet and display body

The present invention relates to a colored adhesive sheet used when bonding display components, and a display using the colored adhesive sheet.

In recent years, display bodies (e.g., automotive displays such as car dashboards, car navigation systems, and various meters installed on control consoles; displays such as tablet terminals for general users; displays such as commercial tablet terminals and electronic billboards; displays such as outdoor electronic billboards, etc.) mostly use image display devices such as liquid crystal display devices and organic electroluminescent devices.

For example, the above-mentioned automotive display is required to be integrated with the surrounding components (such as frame materials) of the display when the display is turned off to enhance the style. Therefore, it is considered to color the display. For example, patent documents 1 to 4 disclose inventions related to coloring the display. [Prior technical document] [Patent document]

[Patent Document 1] Japanese Patent Publication No. 2000-313871 [Patent Document 2] Japanese Patent Publication No. 2009-188298 [Patent Document 3] Japanese Patent Publication No. 2012-234028 [Patent Document 4] Japanese Patent Publication No. 2017-57375

(Invent the problem you want to solve)

However, the coloring purposes of the technologies disclosed in the above patent documents 1 to 4 are different, so the display body is given a sense of unity with the peripheral components, and the style cannot be improved. In addition, because there are various types of peripheral components, the adhesive must also be changed to match the specifications of various components according to the types of peripheral components, so there will be problems such as low freedom of adhesive design and complicated management in manufacturing.

The present invention is made in view of the above-mentioned actual situation, and its purpose is to provide: a colored adhesive sheet that can improve the style of a display, and a display with improved style. (Means for solving the problem)

To achieve the above-mentioned purpose, first, the colored adhesive sheet (Invention 1) provided by the present invention is for being attached to a display component having at least two different brightness regions in a plane direction, and has a colored adhesive layer composed of an adhesive containing a colorant; wherein, according to the CIE1976L*a*b* colorimetric system, if the brightness L* of one region R1 of the display component is set to L1, the brightness L* of another region R2 is set to L2, the brightness L* of the region R1 on which the colored adhesive layer is deposited is set to L1', and the brightness L* of the region R2 on which the colored adhesive layer is deposited is set to L2', the following formulas (I) to (IV) are satisfied: ΔL=L1-L2                … (I) ΔL’=L1’-L2’            … (II) ΔL＞0                      … (III) (ΔL’/ΔL)×100≦80  … (IV).

The colored adhesive sheet of the above invention (Invention 1) can improve the style of the display when the display is turned off, for example, the harmony of the appearance when the display is turned off, when used in the display.

In the above invention (Invention 1), it is preferred that the following formula (V) (Invention 2) is further satisfied: ΔL’≦30                  … (V) .

In the above inventions (Inventions 1 and 2), the brightness L* of the above colored adhesive layer is preferably 5 or more and 95 or less according to the CIE1976 L*a*b* colorimetric system (Invention 3).

In the above inventions (Inventions 1 to 3), the chromaticity a* and chromaticity b* of the above colored adhesive layer are preferably -7 to 7, respectively, according to the CIE1976 L*a*b* color system (Invention 4).

In the above inventions (Inventions 1 to 4), the total light transmittance of the above colored adhesive layer is preferably 30% or more (Invention 5).

In the above inventions (Inventions 1 to 5), the total light haze value of the above colored adhesive layer is preferably greater than or equal to 0.5% and less than or equal to 40% (Invention 6).

In the above inventions (Inventions 1 to 6), the coloring agent is diluted 10,000 times with ethyl acetate, and the average haze value at a wavelength of 780nm and the average haze value at a wavelength of 380nm are preferably greater than 1% and less than 60% (Invention 7).

In the above inventions (Inventions 1 to 7), the difference between the haze value at a wavelength of 780nm and the haze value at a wavelength of 380nm of the above coloring agent diluted 10,000 times with ethyl acetate is preferably 30 points or less (Invention 8).

In the above inventions (Inventions 1 to 8), the coloring agent is preferably a black pigment (Invention 9).

In the above inventions (Inventions 1 to 9), the adhesive is preferably an acrylic adhesive (Invention 10).

In the above inventions (Inventions 1 to 10), the above adhesive is preferably cross-linked from an adhesive composition comprising: a (meth)acrylate polymer (A), a crosslinking agent (B), and a coloring agent (C) (Invention 11).

The above inventions (Inventions 1 to 11) further include: two peeling sheets; and the colored adhesive layer (Invention 12) held by the peeling sheets in contact with the peeling surfaces of the two peeling sheets.

In the above inventions (Inventions 1 to 12), it is preferred to use a method for bonding the above display component to other display components other than the above display component (Invention 13).

Second, the display provided by the present invention (Invention 14) is a display comprising: a first display component having at least two areas of different brightness in a planar direction, a second display component, and a colored adhesive layer for bonding the first display component and the second display component to each other; wherein, according to the CIE1976L*a*b* color system, the first display component is bonded to the second display component. When the brightness L* of one region R1 of the display component is set to L1, the brightness L* of another region R2 is set to L2, the brightness L* of the region R1 on which the colored adhesive layer is deposited is set to L1’, and the brightness L* of the region R2 on which the colored adhesive layer is deposited is set to L2’, the following equations (I) to (IV) are satisfied: ΔL=L1-L2                … (I) ΔL’=L1’-L2’            … (II) ΔL＞0                      … (III) (ΔL’/ΔL)×100≦80  … (IV).

In the above invention (Invention 14), at least one of the first display component and the second display component may be provided with a step on at least one surface on the side to be bonded by the colored adhesive layer (Invention 15).

The above inventions (Inventions 14 and 15) may also have a black frame material (Invention 16). [Compared with the efficacy of the prior art]

According to the colored adhesive sheet of the present invention, the style of the display can be improved. In addition, the display of the present invention has improved style.

The following is a description of an embodiment of the present invention. [Colored adhesive sheet] A colored adhesive sheet of an embodiment of the present invention is provided for attachment to a display component having at least two different brightness regions in a planar direction, and has a colored adhesive layer composed of an adhesive containing a colorant, and preferably a release sheet is laminated on one or both sides of the colored adhesive layer. The colored adhesive sheet of this embodiment is preferably used to bond the above-mentioned display component to other display components other than the above-mentioned display component. The related display and display component will be described later.

An example of a colored adhesive sheet of the present embodiment is specifically configured as shown in FIG1. As shown in FIG1, the colored adhesive sheet 1 is composed of: two peeling sheets 12a, 12b, and a colored adhesive layer 11 held by the two peeling sheets 12a, 12b in a manner that the peeling surfaces of the two peeling sheets 12a, 12b are in contact with each other. In addition, the "peeling surface of the peeling sheet" referred to in this specification refers to a peeling surface of the peeling sheet, including a peeling surface, and a peeling surface that is peeling even if the peeling surface is not peeled.

1. Each component 1-1. Colored adhesive layer The colored adhesive sheet 1 of this embodiment is related to the brightness L* specified in the CIE1976 L*a*b* color system. When the brightness L* of one area R1 of a display component (adherent) having at least two different brightness areas in the plane direction is set to L1, the brightness L* of the other area R2 is set to L2, the brightness L* of the area R1 where the colored adhesive layer 11 has been layered is set to L1', and the brightness L* of the area R2 where the colored adhesive layer 11 has been layered is set to L2', the following formulas (I) to (IV) are satisfied, and preferably the following formula (V) is further satisfied: ΔL=L1-L2                … (I) ΔL'=L1'-L2'            … (II) ΔL＞0                      … (III) (ΔL’/ΔL)×100≦80  … (IV) ΔL’≦30                  … (V)

In addition, the measurement method of the brightness L* in this specification is as shown in the test example described below. The measurement of L1 and L2 is for the reflected light from the above-mentioned display component, and the measurement of L1' and L2' is for the reflected light from the incident light near the color adhesive layer 11. The above-mentioned display component is preferably black.

The colored adhesive layer 11 that meets the above conditions, when applied to a display having the above-mentioned display components, can enhance the style of the display when the display is turned off. An example of such style is the harmonious appearance when the display is turned off. Specifically, when the display is turned off, the boundary between the display portion and its peripheral components (such as black frame material, black printed layer) is not easily visible (seamless). Thereby, the sense of unity between the display and the peripheral components can be enhanced when the display is turned off. Furthermore, even if there are multiple peripheral components (such as black frame material, black printed layer), the appearance of the display and each peripheral component can be harmonious, or the appearance of the peripheral components can be harmonious (seamless). Therefore, since there are more components that can achieve harmonious appearance, the adhesive constituting the colored adhesive layer 11 has high versatility and a large degree of design freedom.

From the above viewpoint, the value of (ΔL’/ΔL)×100 must be 80 or less, preferably 70 or less, more preferably 60 or less, particularly preferably 50 or less, optimally 45 or less, and most optimally 40 or less. On the other hand, the lower limit of (ΔL’/ΔL)×100 is not particularly limited, but from the viewpoint of taking into account the image/video visibility of the display, it is preferably 10 or more, more preferably 15 or more, particularly preferably 20 or more, and optimally 30 or more.

The ΔL value becomes the reference value of formula (IV). If the ΔL value exceeds 0, the brightness L1 of one area R1 of the display component (adherent) is different from the brightness L2 of another area R2. It can be said that the display component can become an area with at least 2 different brightnesses in the plane direction. Here, if the ΔL value is closer to 0, the appearance of the area R1 and the area R2 of the display component are closer, and the appearance harmony in visual evaluation is easy to be good. On the contrary, if the ΔL value becomes larger, there is a tendency that the appearance harmony control tends to be difficult. The colored adhesive layer 11 of this embodiment can fully play the role of improving the appearance harmony (style) even in such an area where the general appearance harmony control is difficult by satisfying formula (IV).

The ΔL value is as long as it exceeds 0 as in formula (III). From the viewpoint of improving the accuracy of judging the appearance harmony using formula (IV), it is preferably 5 or more, more preferably 10 or more, particularly preferably 20 or more, optimally 30 or more, and most optimally 35 or more. The upper limit value of ΔL is preferably 100 or less, more preferably 75 or less, particularly preferably 50 or less, and optimally 40 or less, from the viewpoint of improving the accuracy of judging the appearance harmony.

From the perspective of improving the appearance harmony of the display, the ΔL’ value is preferably 30 or less, more preferably 25 or less, particularly preferably 20 or less, and optimally 15 or less, as in formula (V). On the other hand, the lower limit of ΔL’ is not particularly limited, but from the perspective of improving both the accuracy of judging the appearance harmony using the aforementioned formula (IV) and the image/video visibility of the obtained display, it is preferably 1.5 or more, more preferably 3 or more, particularly preferably 4 or more, and optimally 5 or more.

The coloring adhesive layer 11 preferably has a brightness L* specified by the CIE1976 L*a*b* color system, which is preferably 95 or less, more preferably 92 or less, particularly preferably 90 or less, and optimally 88 or less. Thus, the aforementioned formula (IV) (and formula (V)) can be easily satisfied. Furthermore, the aforementioned brightness L* is preferably 5 or more, more preferably 20 or more, particularly preferably 50 or more, optimally 70 or more, and most optimally 80 or more. Thus, the aforementioned formula (IV) (and formula (V)) can be easily satisfied, and the image/video viewing performance of the obtained display can also be easily improved.

The colored adhesive layer 11 of this embodiment preferably has an average haze of the haze value at a wavelength of 780 nm and the average haze value at a wavelength of 380 nm of 1% or more, more preferably 2% or more, particularly preferably 3% or more, and optimally 3.2% or more. This can easily satisfy the aforementioned formula (IV) (and formula (V)). In addition, the above average haze is preferably 60% or less, more preferably 40% or less, and particularly preferably 30% or less from the perspective of easily satisfying the aforementioned formula (IV) (and formula (V)). From the perspective of easily making the image/image viewability of the obtained display body good, it is more preferably 20% or less, particularly preferably 12% or less, and optimally 5% or less. In addition, the haze value in this specification is a value measured in accordance with JIS K7136:2000.

The difference (absolute value) between the haze value of the colored adhesive layer 11 at a wavelength of 780nm and the haze value at a wavelength of 380nm is preferably 15 points or less, more preferably 10 points or less, and particularly preferably 7 points or less. Thus, when the colored adhesive layer 11 of the present embodiment is applied to a display, the color balance on the screen does not change regardless of the observation position and angle when the display is lit. As a result, when the display is lit, the image/video visibility (wide-angle visibility) can be improved when viewed from a wide range of angles, so as to improve the image quality.

The lower limit of the difference in the haze value is preferably 0 points. From the perspective of being able to easily adjust the average haze to a desired value, it is preferably 1 point or more, more preferably 2 points or more, particularly preferably 3 points or more, and optimally 4 points or more.

The haze value of the colored adhesive layer 11 of this embodiment at a wavelength of 780nm is preferably 0.1~50%, more preferably 0.2~25%, particularly preferably 0.5~15%, optimally 0.7~7%, and most optimally 1~3%, from the perspective of being able to easily adjust the above-mentioned average haze, haze value difference value, and the later-described haze value standard deviation to the desired value.

Furthermore, the haze value of the colored adhesive layer 11 of the present embodiment at a wavelength of 380 nm is preferably 0.1-60%, more preferably 1-40%, particularly preferably 2-30%, optimally 4-20%, and most optimally 5-10%, from the perspective of being able to easily adjust the above-mentioned average haze, haze value difference, and the later-described haze value standard deviation to the desired values.

The coloring adhesive layer 11 of the present embodiment preferably has a standard deviation of haze value of 5 nm at each wavelength (i.e., 380 nm, 385 nm, 390 nm, ..., 775 nm, 780 nm) in the wavelength range of 380 nm to 780 nm, which is preferably 5 or less, more preferably 3 or less, and particularly preferably 2 or less. Thus, when the coloring adhesive layer 11 of the present embodiment is applied to a display, the color balance on the screen does not change regardless of the observation position and angle when the display is lit. As a result, when the display is lit, the image/video viewability (wide-angle viewability) when viewed from a wide range of angles can be improved, so as to improve the image quality.

The lower limit of the standard deviation is usually greater than 0. From the perspective of easily satisfying the aforementioned formula (IV) (and formula (V)), it is preferably greater than 0.1, more preferably greater than 0.5, particularly preferably greater than 1, optimally greater than 1.5, and most optimally greater than 1.7.

The total light haze value of the colored adhesive layer 11 of this embodiment is preferably 0.5% or more, more preferably 1% or more, particularly preferably 2% or more, and most preferably 3% or more. Thus, the aforementioned formula (IV) (and formula (V)) can be easily satisfied. On the other hand, the total light haze value is preferably 40% or less, more preferably 30% or less, particularly preferably 20% or less, most preferably 10% or less, and most preferably 5% or less. Thus, the visibility of the display can be easily improved.

The total light transmittance of the colored adhesive layer 11 of this embodiment (value measured according to JIS K7361-1:1997) is usually less than 100%, preferably less than 98%, more preferably less than 90%, particularly preferably less than 70%, and optimally less than 50%. Thus, the aforementioned formula (IV) (and formula (V)) can be easily satisfied. On the other hand, the above-mentioned total light transmittance is preferably more than 30%, more preferably more than 35%, particularly preferably more than 40%, and optimally more than 45%. Thus, the visibility of the display can be easily improved.

Here, the peripheral member may be, for example, a car instrument panel with a brightness L* of 23.2, a chromaticity a* of -0.5, and a chromaticity b* of -1.5 as specified in the CIE1976 L*a*b* color system. The color tone of the peripheral member is preferably a brightness L* of 5 to 90, a chromaticity a* of -40 to 40, and a chromaticity b* of -40 to 40, more preferably a brightness L* of 10 to 80, a chromaticity a* of -30 to 30, and a chromaticity b* of -30 to 30, and particularly preferably a brightness L* of 15 to 70, a chromaticity a* of -20 to 20, and a chromaticity b* of -20 to 20. The colored adhesive sheet 1 of this embodiment is quite suitable for a display having a peripheral member with the above color tone.

The chromaticity a* of the colored adhesive layer 11 is preferably -7 to 7, more preferably -5 to 5, particularly preferably -3 to 3, and optimally -1 to 1 in terms of display style according to the CIE 1976 L*a*b* colorimetric system. Furthermore, the chromaticity b* of the colored adhesive layer 11 is preferably -7 to 7, more preferably -5 to 5, particularly preferably -3 to 3, and optimally -1 to 1 in terms of display style according to the CIE 1976 L*a*b* colorimetric system. In addition, the measurement method of the chromaticity a* and the chromaticity b* in this specification is as shown in the test examples described below.

By satisfying the above optical properties, the colored adhesive layer 11, when applied to a display, will increase the black tone when the display is off, so as to further enhance the style of the display (for example, the appearance harmony when the lights are off). Specifically, for a display (especially a car display), the sense of integration with the surrounding components (such as black frame material) can be further enhanced.

The above optical properties can be achieved by properly selecting the adhesive constituting the colored adhesive layer 11 and the type and content of the colorant contained therein.

The colorant is a solution of the colorant diluted 10,000 times with ethyl acetate, and the average lower limit of the average haze value at a wavelength of 780nm and the average haze value at a wavelength of 380nm is preferably 1% or more, more preferably 2% or more, and particularly preferably 3% or more. In addition, the upper limit of the average haze of the colorant is preferably 60% or less, more preferably 40% or less, particularly preferably 25% or less, optimally 15% or less, and most optimally 8% or less. From the perspective of both visibility, 5% or less is particularly preferred. By using this colorant in an appropriate amount, the obtained colored adhesive layer 11 can easily satisfy the aforementioned optical properties and can easily satisfy the aforementioned formula (IV) (and formula (V)).

Furthermore, the colorant is a solution of the colorant diluted 10,000 times with ethyl acetate, and the difference between the haze value at a wavelength of 780 nm and the haze value at a wavelength of 380 nm is preferably 30 points or less, more preferably 25 points or less, particularly preferably 20 points or less, and most preferably 14 points or less. By using this colorant in an appropriate amount, the obtained colored adhesive layer 11 can easily satisfy the aforementioned optical properties and can easily satisfy the aforementioned formula (IV) (and formula (V)).

In addition, the lower limit of the difference in the above haze value may be 0 points. From the perspective of the obtained colored adhesive layer 11 easily satisfying the above optical properties and the above formula (IV) (and formula (V)), it is preferably 1 point or more, and more preferably 4 points or more. From the perspective of taking visibility into consideration, it is preferably 7.5 points or more.

The coloring agent is diluted 10,000 times with ethyl acetate, and the haze value at a wavelength of 780nm is preferably 0.1-50%, more preferably 0.5-25%, particularly preferably 0.8-15%, optimally 1-3%, and most optimally 2-2.5%. In addition, the coloring agent is diluted 10,000 times with ethyl acetate, and the haze value at a wavelength of 380nm is preferably 1-60%, more preferably 3-30%, particularly preferably 6-20%, and optimally 10-15%. Thus, the obtained colored adhesive layer 11 can easily satisfy the aforementioned optical properties and can easily satisfy the aforementioned formula (IV) (and formula (V)).

Furthermore, the standard deviation of the haze value of the colorant diluted 10,000 times with ethyl acetate in the wavelength range of 380nm to 780nm at each wavelength with a distance of 5nm (i.e., 380nm, 385nm, 390nm, ..., 775nm, 780nm) is preferably 10 or less, more preferably 6 or less, particularly preferably 3 or less, and optimally 1.8 or less. The lower limit of the standard deviation is preferably 0, but is usually preferably 0.1 or more, more preferably 0.3 or more, particularly preferably 0.5 or more, and optimally 1 or more. Thus, the obtained colored adhesive layer 11 can easily satisfy the aforementioned optical properties and can easily satisfy the aforementioned formula (IV) (and formula (V)).

The coloring agent can be a pigment or a dye. The pigment can be an inorganic pigment or an organic pigment. From the perspective of the durability of the adhesive, inorganic pigments are preferred. The color of the coloring agent can be appropriately selected in accordance with the color of the surrounding components to present a sense of unity. Generally, dark or dark colors such as black, brown, dark blue, purple, and blue are preferred, and black is particularly preferred.

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, ITO (indium tin oxide) pigments, and ATO (antimony tin oxide) pigments.

Furthermore, examples of organic pigments and organic dyes include amine pigments, cyanine pigments, merocyanine pigments, croconium pigments, squalium pigments, azulenium pigments, polymethine pigments, naphthoquinone pigments, pyrylium pigments, phthalocyanine pigments, naphthalocyanine pigments, naphtholactam pigments, azo pigments, condensed azo pigments, indigo pigments, perinone pigments, and perylene pigments. , dioxane-based pigments, quinacridone-based pigments, isoindolinone-based pigments, quinophthalone-based pigments, pyrrole-based pigments, thioindigo-based pigments, metal complex-based pigments (metal complex dyes), dithiol metal complex-based pigments, indoxyl-based pigments, triallyl methane-based pigments, anthraquinone-based pigments, dioxane-based pigments, naphthol-based pigments, azomethine-based pigments, benzimidazolone-based pigments, pyranthrone-based pigments, and threne-based pigments.

Examples of black pigments include carbon black, copper oxide, ferric oxide, manganese dioxide, aniline black, activated carbon, etc. Examples of black dyes include high-concentration plant dyes, azo dyes, etc.

The above-mentioned pigments or dyes can be appropriately mixed and used in accordance with the method in which the colored adhesive layer 11 can obtain the target physical properties.

Among the above coloring agents, carbon black, aniline black based black dyes and chromate based black dyes are preferred from the viewpoint of being easy to satisfy the above physical properties and being easy to form a sense of unity with surrounding components. In addition, the carbon black may be subjected to a predetermined treatment (e.g., solvation treatment) or may not be subjected to such treatment.

In the colored adhesive sheet 1 of the present embodiment, the type of adhesive constituting the colored adhesive layer 11 is not particularly limited, and may be, for example, any one of acrylic adhesives, polyester adhesives, polyurethane adhesives, rubber adhesives, silicone adhesives, etc. In addition, the adhesive may be any one of latex type, solvent type or solvent-free type, and may be any one of crosslinked type or non-crosslinked type. Among these, acrylic adhesives having excellent adhesive properties, optical properties, etc. are preferred.

Furthermore, the acrylic adhesive may be active energy ray-hardening or active energy ray-non-hardening. Also, the acrylic adhesive is preferably crosslinking, more preferably thermally crosslinking.

The adhesive is preferably formed by crosslinking an adhesive composition (hereinafter referred to as "adhesive composition P") containing a (meth)acrylate polymer (A), a crosslinking agent (B), and a coloring agent (C). When the adhesive is an active energy ray-curable adhesive, the adhesive composition P preferably further contains an active energy ray-curable component (D).

The colorant (C) contained in the adhesive composition P is the aforementioned colorant. The adhesive obtained from the adhesive composition P can exhibit excellent optical properties, adhesion, durability (step tracking under high temperature and high humidity conditions), etc. In addition, the "(meth) acrylic acid" in this specification refers to both acrylic acid and methacrylic acid. Other similar terms are the same. In addition, "polymer" also includes the concept of "copolymer".

(1) Components of the adhesive composition (1-1) (Meth)acrylate polymer (A) In the (meth)acrylate polymer (A) of this embodiment, the monomer units constituting the polymer are preferably reactive monomers having reactive groups in the molecule that can react with the crosslinking agent (B). The reactive groups derived from the reactive monomers react with the crosslinking agent (B) to form a crosslinking structure (three-dimensional network structure), thereby obtaining an adhesive having the desired cohesive force.

The above-mentioned reactive group-containing monomers are preferably, for example, monomers having a hydroxyl group in the molecule (hydroxyl-containing monomers), monomers having a carboxyl group in the molecule (carboxyl-containing monomers), monomers having an amino group in the molecule (amino-containing monomers), etc. Among them, hydroxyl-containing monomers or carboxyl-containing monomers having excellent reactivity with the crosslinking agent (B) are preferred, and the combined use of hydroxyl-containing monomers and carboxyl-containing monomers is also preferred.

Examples of hydroxyl-containing monomers include hydroxyl alkyl (meth)acrylates such as 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxybutyl (meth)acrylate, 3-hydroxybutyl (meth)acrylate, and 4-hydroxybutyl (meth)acrylate. Among them, hydroxyl alkyl (meth)acrylates having a hydroxyl alkyl group with 1 to 4 carbon atoms are preferred from the viewpoint of the reactivity of the hydroxyl group of the obtained (meth)acrylate polymer (A) with the crosslinking agent (B) and the copolymerizability with other monomers. Specific examples include 2-hydroxyethyl (meth)acrylate and 4-hydroxybutyl (meth)acrylate, and particularly 2-hydroxyethyl acrylate and 4-hydroxybutyl acrylate. These may be used alone or in combination of two or more.

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

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

In the (meth)acrylate polymer (A), the monomer units constituting the polymer are monomers containing reactive groups, and the lower limit is preferably 1% by mass or more, more preferably 5% by mass or more, and particularly preferably 10% by mass or more. Moreover, from the perspective of making the dispersibility of the colorant (C) in the adhesive more favorable, it is best to contain 12% by mass or more, and most preferably 15% by mass or more. On the other hand, in the (meth)acrylate polymer (A), the monomer units constituting the polymer are monomers containing reactive groups, and the upper limit is preferably 35% by mass or less, more preferably 30% by mass or less, and particularly preferably 20% by mass or less. Moreover, from the perspective of making the dispersibility of the colorant (C) in the adhesive more favorable, it is best to contain 18% by mass or less. If the monomer units of the (meth)acrylate polymer (A) contain the reactive group-containing monomer according to the above amount, the obtained adhesive can form a good cross-linked structure and obtain the required cohesive force. In addition, the colorant (C) in the adhesive tends to have good dispersibility, and the obtained adhesive has good reproducibility and uniformity of the aforementioned optical properties, and can easily satisfy the aforementioned formula (IV) (and formula (V)), and can present excellent style and inspection properties. In addition, when the reactive group-containing monomer is a hydroxyl-containing monomer, the content is preferably 15% by mass or more. In this case, a predetermined amount of hydroxyl groups will remain in the adhesive. Hydroxyl groups are hydrophilic groups. If a certain amount of such hydrophilic groups exists in the adhesive, even if the adhesive is placed under high temperature and high humidity conditions, it can still show good solubility with the water that penetrates into the adhesive under such high temperature and high humidity conditions. As a result, the whitening of the adhesive can be suppressed when it returns to normal temperature and humidity (excellent resistance to moisture and heat whitening).

Furthermore, the monomer units constituting the (meth)acrylate polymer (A) preferably do not contain carboxyl-containing monomers. Since carboxyl groups are acid components, by not containing carboxyl-containing monomers, although the adhesive may cause adverse effects due to the acid on the adhesive attachment object, when transparent conductive films such as tin-doped indium oxide (ITO) and metal films are present, such adverse effects (corrosion, resistance value changes, etc.) caused by the acid can be suppressed. However, a predetermined amount of carboxyl-containing monomers is allowed to be contained within a range that does not cause such adverse effects. Specifically, in the (meth)acrylate polymer (A), the monomer units are allowed to contain carboxyl-containing monomers in an amount of 0.1% by mass or less, preferably 0.01% by mass or less, and more preferably 0.001% by mass or less.

In the (meth)acrylate polymer (A), the monomer units constituting the polymer preferably contain (meth)acrylate alkyl esters. This can exhibit good adhesion. The alkyl group can be a linear chain or a branched chain.

From the viewpoint of adhesion and dispersibility of the colorant (C), the alkyl (meth)acrylate is preferably an alkyl (meth)acrylate having an alkyl carbon number of 1 to 20. Examples of the alkyl (meth)acrylate having an alkyl carbon number of 1 to 20 include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, n-butyl (meth)acrylate, n-pentyl (meth)acrylate, n-hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, n-decyl (meth)acrylate, n-dodecyl (meth)acrylate, myristyl (meth)acrylate, palmityl (meth)acrylate, stearyl (meth)acrylate, and the like. Among them, from the viewpoint of further improving the adhesiveness, (meth)acrylates having an alkyl carbon number of 1 to 8 are preferred, and methyl (meth)acrylate, n-butyl (meth)acrylate or 2-ethylhexyl (meth)acrylate are particularly preferred, and methyl methacrylate, n-butyl acrylate or 2-ethylhexyl acrylate are more preferred. In addition, these may be used alone or in combination of two or more.

In the (meth)acrylate polymer (A), the monomer units constituting the polymer preferably contain 50% by mass or more of (meth)acrylate alkyl ester, more preferably 60% by mass or more, and particularly preferably 65% by mass or more. If the lower limit of the content of (meth)acrylate alkyl ester is as described above, the (meth)acrylate polymer (A) can exhibit better adhesion. In addition, there is a tendency to make the dispersion of the colorant (C) in the adhesive good, and the required adhesion of the (meth)acrylate polymer (A) will not be impaired. Thereby, the obtained adhesive can exhibit better adhesion, and the reproducibility and uniformity of the aforementioned optical properties are good, and the aforementioned formula (IV) (and formula (V)) can be easily satisfied, showing excellent styling and inspection properties. On the other hand, in the (meth)acrylate polymer (A), the monomer units constituting the polymer preferably contain 99% by mass or less of (meth)acrylate alkyl ester, more preferably 95% by mass or less, particularly preferably 90% by mass or less, and most preferably 85% by mass or less. If the upper limit of the content of the (meth)acrylate alkyl ester is as described above, other monomer components such as monomers containing reactive functional groups can be introduced into the (meth)acrylate polymer (A) in an optimal amount.

In the above (meth)acrylate polymer (A), the monomer units constituting the polymer preferably contain monomers having an alicyclic structure in the molecule (alicyclic structure-containing monomers). Since alicyclic structure-containing monomers are relatively bulky, it is presumed that the presence of such monomers in the polymer can widen the intervals between polymers, and the resulting adhesive can have excellent flexibility. As a result, the adhesive has excellent step-following properties.

The alicyclic carbon ring of the alicyclic monomer may be a saturated structure or may have an unsaturated bond in part. Furthermore, the alicyclic structure may be a monocyclic alicyclic structure or a polycyclic alicyclic structure such as a bicyclic or tricyclic structure. From the viewpoint of making the distance between the obtained (meth)acrylate polymer (A) appropriate and providing a higher stress relief property by using an adhesive, the alicyclic structure is preferably a polycyclic alicyclic structure (polycyclic structure). Furthermore, if the compatibility of the (meth)acrylate polymer (A) with other components is considered, the polycyclic structure is preferably a bicyclic to tetracyclic structure. As described above, from the viewpoint of imparting stress relaxation, the carbon number of the alicyclic structure (referring to the total number of carbon atoms in the ring-forming part; when multiple rings exist independently, it refers to the total number of carbon atoms) is usually preferably 5 or more, more preferably 7 or more. On the other hand, the upper limit of the carbon number of the alicyclic structure is not particularly limited, but as described above, from the viewpoint of compatibility, it is preferably 15 or less, more preferably 10 or less.

The above-mentioned monomer containing alicyclic structure can be specifically exemplified by: cyclohexyl (meth)acrylate, dicyclopentyl (meth)acrylate, adamantyl (meth)acrylate, isoborneol (meth)acrylate, dicyclopentenyl (meth)acrylate, dicyclopentenyloxyethyl (meth)acrylate, etc. Among them, dicyclopentyl (meth)acrylate (carbon number of alicyclic structure: 10), adamantyl (meth)acrylate (carbon number of alicyclic structure: 10) or isoborneol (meth)acrylate (carbon number of alicyclic structure: 7) which can exert better isotropic step tracking property is preferred, isoborneol (meth)acrylate is particularly preferred, and isoborneol acrylate is more preferred. These monomers can be used alone or in combination of two or more.

In the (meth)acrylate polymer (A), when the monomer units constituting the polymer contain a monomer containing an alicyclic structure, the alicyclic structure monomer preferably contains 1% by mass or more, more preferably 4% by mass or more, and particularly preferably 8% by mass or more. In addition, in the (meth)acrylate polymer (A), the monomer units constituting the polymer preferably contain 30% by mass or less, more preferably 22% by mass or less, and particularly preferably 14% by mass or less of the alicyclic structure monomer. By having the content of the alicyclic structure monomer within the above range, the obtained adhesive can have better step tracking properties and better adhesion to plastics.

Furthermore, in the above-mentioned (meth)acrylate polymer (A), the monomer units constituting the polymer preferably contain nitrogen atom-containing monomers. The presence of nitrogen atom-containing monomers constituting the units in the polymer can impart a predetermined polarity to the adhesive, and exhibit excellent affinity to adherends having a certain degree of polarity such as glass. From the perspective of giving the (meth)acrylate polymer (A) appropriate rigidity, the above-mentioned nitrogen atom-containing monomer is preferably a monomer having a nitrogen-containing heterocyclic ring. Furthermore, from the perspective of increasing the degree of freedom of the part derived from the above-mentioned nitrogen atom-containing monomer in the higher-order structure of the constituted adhesive, the nitrogen atom-containing monomer preferably does not contain a reactive unsaturated double bond group except for one polymerizable group used in the polymerization for forming the (meth)acrylate polymer (A).

Examples of monomers having a nitrogen-containing heterocyclic ring include N-(methyl)acryloyl iodine, N-vinyl-2-pyrrolidone, N-(methyl)acryloyl pyrrolidone, N-(methyl)acryloyl piperidine, N-(methyl)acryloyl pyrrolidine, N-(methyl)acryloyl aziridine, ethyl (methyl)acrylate, 2-vinyl pyridine, 4-vinyl pyridine, 2-vinyl pyridine, 1-vinylimidazole, N-vinyl carbazole, N-vinyl phthalimide, etc. Among them, N-(methyl)acryloyl iodine is preferred, and N-acryloyl iodine is particularly preferred, as it exhibits better adhesion. These monomers may be used alone or in combination of two or more.

In the (meth)acrylate polymer (A), when the monomer units constituting the polymer contain nitrogen-containing monomers, the nitrogen-containing monomers are preferably contained in an amount of 1 mass % or more, more preferably 4 mass % or more, and particularly preferably 8 mass % or more. In addition, in the (meth)acrylate polymer (A), the monomer units constituting the polymer are preferably contained in an amount of 20 mass % or less, more preferably 16 mass % or less, and particularly preferably 12 mass % or less. When the content of the nitrogen-containing monomers is within the above range, the obtained adhesive can fully exert excellent adhesion to glass.

The (meth)acrylate polymer (A) may contain other monomers as needed in the monomer units constituting the polymer. In order not to inhibit the aforementioned effects of the monomer containing a reactive functional group, the other monomers are preferably monomers that do not contain a reactive functional group. Examples of the monomers include (meth)acrylate methoxyethyl, (meth)acrylate ethoxyethyl, (meth)acrylate and other (meth)acrylate alkoxyalkyl esters, vinyl acetate, styrene, and the like. These monomers may be used alone or in combination of two or more.

The (meth)acrylate polymer (A) is preferably a linear polymer. The linear polymer easily induces molecular chain entanglement, and it is expected that the cohesive force can be improved, so that the storage modulus, gelation rate and adhesion of the obtained adhesive are likely to be optimal, and the step tracking property under high temperature and high humidity conditions is excellent.

Furthermore, the (meth)acrylate polymer (A) is preferably a solution polymer obtained by solution polymerization. By using solution polymerization, a high molecular weight polymer can be easily obtained, and it is expected that the cohesive force can be improved, so that the storage modulus, gelatinization rate and adhesion of the obtained adhesive are likely to be optimized, and the step tracking property under high temperature and high humidity conditions is excellent.

The polymerization state of the (meth)acrylate polymer (A) may be a random copolymer or a block copolymer.

The weight average molecular weight of the (meth)acrylate polymer (A) preferably has a lower limit of 200,000 or more, more preferably 300,000 or more, and particularly preferably 400,000 or more. From the perspective of the dispersibility of the colorant (C), the best value is 500,000 or more, and the most optimal value is 700,000 or more. If the weight average molecular weight of the (meth)acrylate polymer (A) has the above lower limit, the storage modulus, gelling rate, and adhesion of the obtained adhesive are likely to be optimal, and the step tracking property under high temperature and high humidity conditions is more excellent. In addition, there is a tendency to make the dispersibility of the colorant (C) in the adhesive good, so the obtained adhesive has good reproducibility and uniformity of the aforementioned optical properties, and easily satisfies the aforementioned formula (IV) (and formula (V)), showing excellent pattern and inspection properties.

Furthermore, the upper limit of the weight average molecular weight of the (meth)acrylate polymer (A) is preferably 2 million or less, more preferably 1.5 million or less, and particularly preferably 1 million or less. If the upper limit of the weight average molecular weight of the (meth)acrylate polymer (A) is as above, the storage modulus, gelation rate, and adhesion of the obtained adhesive are likely to be optimal, and the initial step tracking property is more excellent. In addition, the weight average molecular weight in this specification is a standard polystyrene conversion value measured by a gel permeation chromatography (GPC) method.

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

(1-2) Crosslinking agent (B) The crosslinking agent (B) is used to crosslink the (meth)acrylate polymer (A) by heating the adhesive composition P, thereby forming a good three-dimensional network structure. This can enhance the cohesive force of the obtained adhesive and make the step tracking property under high temperature and high humidity conditions excellent.

The above-mentioned crosslinking agent (B) can be any crosslinking agent as long as it can react with the reactive group of the (meth)acrylate polymer (A), and examples thereof include isocyanate crosslinking agents, epoxy crosslinking agents, amine crosslinking agents, melamine crosslinking agents, aziridine crosslinking agents, hydrazine crosslinking agents, aldehyde crosslinking agents, oxazoline crosslinking agents, metal alkoxide crosslinking agents, metal chelate crosslinking agents, metal salt crosslinking agents, ammonium salt crosslinking agents, etc. In the above, when the reactive group of the (meth)acrylate polymer (A) is a hydroxyl group, it is preferred to use an isocyanate crosslinking agent having excellent reactivity with a hydroxyl group, and when the reactive group of the (meth)acrylate polymer (A) is a carboxyl group, it is preferred to use an epoxy crosslinking agent having excellent reactivity with a carboxyl group. In addition, the crosslinking agent (B) may be used alone or in combination of two or more.

Isocyanate crosslinking agents contain at least polyisocyanate compounds. Examples of polyisocyanate compounds include aromatic polyisocyanates such as toluene diisocyanate, diphenylmethane diisocyanate, and phenylene diisocyanate; aliphatic polyisocyanates such as hexamethylene diisocyanate; alicyclic polyisocyanates such as isophorone diisocyanate and diphenylmethane diisocyanate, and their biuret forms, trimer forms, and adducts of their reaction products with low molecular weight active hydrogen compounds such as ethylene glycol, propylene glycol, neopentyl glycol, trihydroxymethylpropane, and castor oil. Among them, from the viewpoint of reactivity with hydroxyl groups, trihydroxymethylpropane-modified aromatic polyisocyanates are preferred, and trihydroxymethylpropane-modified toluene diisocyanate and trihydroxymethylpropane-modified phenylene diisocyanate are particularly preferred.

Examples of epoxy crosslinking agents include 1,3-bis(N,N-diepoxypropylmethyl)cyclohexane, N,N,N',N'-tetraepoxypropyl-m-xylene diamine, ethylene glycol diepoxypropyl ether, 1,6-hexanediol diepoxypropyl ether, trihydroxymethylpropane diepoxypropyl ether, diepoxypropylaniline, diepoxypropylamine, etc. Among them, 1,3-bis(N,N-diepoxypropylmethyl)cyclohexane is preferred from the viewpoint of reactivity with carboxyl groups.

The content of the crosslinking agent (B) in the adhesive composition P is preferably 0.01 parts by mass or more, more preferably 0.05 parts by mass or more, and particularly preferably 0.1 parts by mass or more, relative to 100 parts by mass of the (meth)acrylate polymer (A). In addition, 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 most preferably 0.4 parts by mass or less. When the content of the crosslinking agent (B) is within the above range, the obtained adhesive can exert good cohesion, can easily meet the required storage modulus, gelatinization rate and adhesion, and has better step tracking performance under high temperature and high humidity conditions.

(1-3) Colorant (C) Colorant (C) is the aforementioned colorant. The specific types are as mentioned above.

The content of the colorant (C) relative to 100 parts by weight of the (meth)acrylate polymer (A) is preferably 0.01 parts by weight or more, more preferably 0.1 parts by weight or more, particularly preferably 0.3 parts by weight or more, and most preferably 0.6 parts by weight or more. Furthermore, the above content is preferably 5 parts by weight or less, more preferably 3 parts by weight or less, particularly preferably 2 parts by weight or less, most preferably 1 part by weight or less, and most preferably 0.9 parts by weight or less. By having the content of the colorant (C) within the above range, the obtained adhesive can easily satisfy the above optical properties, can easily satisfy the above formula (IV) (and formula (V)), and exhibit excellent styling and inspection properties.

(1-4) Active energy ray-hardening component (D) The adhesive is formed by crosslinking the adhesive composition P. After the adhesive is hardened by active energy ray, the active energy ray-hardening component (D) will polymerize with each other. It is estimated that the polymerized active energy ray-hardening component (D) will be entangled in the crosslinking structure (three-dimensional network structure) of the (meth)acrylate polymer (A). The adhesive with this high-order structure can exert very excellent durability and has excellent step tracking properties under high temperature and high humidity conditions.

The active energy ray-curable component (D) is a component that can be cured by irradiation with active energy rays and can obtain the above-mentioned effects. There is no particular limitation on the other components, and it can be any one of a monomer, an oligomer or a polymer, or a mixture thereof. Among them, a multifunctional acrylate monomer having a better foaming resistance is preferred.

Examples of the multifunctional acrylate monomer include 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, neopentyl glycol adipate di(meth)acrylate, hydroxytrimethylacetic acid neopentyl glycol di(meth)acrylate, dicyclopentyl di(meth)acrylate, tricyclodecane dimethanol (meth)acrylate, caprolactone-modified dicyclopentenyl di(meth)acrylate, ethylene oxide-modified phosphoric acid di(meth)acrylate, di(acryloyloxyethyl) trimer isocyanate, allyl cyclohexyl di(meth)acrylate, ethoxylated bisphenol A diacrylate, 9,9-bis[4-(2-acryloyloxyethoxy) [0043] Difunctional types such as trihydroxymethylpropane tri(meth)acrylate, dipentatriol tri(meth)acrylate, propionic acid-modified dipentatriol tri(meth)acrylate, pentaerythritol tri(meth)acrylate, propylene oxide-modified trihydroxymethylpropane tri(meth)acrylate, tris(acryloxyethyl) trimer isocyanate, ε-caprolactone-modified tris(2-(meth)acryloxyethyl) trimer isocyanate, etc.; tetrafunctional types such as diglycerol tetra(meth)acrylate and pentaerythritol tetra(meth)acrylate; pentafunctional types such as propionic acid-modified dipentatriol penta(meth)acrylate; hexafunctional types such as dipentatriol hexa(meth)acrylate and caprolactone-modified dipentatriol hexa(meth)acrylate, etc. These may be used alone or in combination of two or more. Furthermore, from the viewpoint of compatibility with the (meth)acrylate polymer (A), the polyfunctional acrylate monomer preferably has a molecular weight of less than 1,000.

Among the above, from the viewpoint of the foaming resistance of the obtained adhesive, preferred are: polyfunctional acrylate monomers containing isocyanurate structures in the molecule such as di(acryloxyethyl) isocyanurate, tris(acryloxyethyl) isocyanurate, ε-caprolactone-modified tris-(2-(meth)acryloxyethyl) isocyanurate, or polyfunctional acrylate monomers containing cyclic structures (especially cycloalkane structures) in the molecule such as tricyclodecanedimethanol (meth)acrylate; more preferred are polyfunctional acrylate monomers having three or more functional groups and containing isocyanurate structures in the molecule. A polyfunctional acrylate monomer having a cyanate structure, or a polyfunctional acrylate monomer having a difunctional group or more and containing a polycyclic structure (especially a polycyclic structure of a cycloalkane) in the molecule; particularly preferably ε-caprolactone-modified 3-(2-(methyl)acryloxyethyl) isocyanurate or tricyclic decanedimethanol (meth)acrylate; more preferably ε-caprolactone-modified 3-(2-acryloxyethyl) isocyanurate or tricyclic decanedimethanol acrylate; and most preferably ε-caprolactone-modified 3-(2-acryloxyethyl) isocyanurate.

The content of the active energy ray-curable component (D) in the adhesive composition P is preferably 1 part by mass or more, more preferably 3 parts by mass or more, and particularly preferably 4 parts by mass or more, based on 100 parts by mass of the (meth)acrylate polymer (A), from the viewpoint of improving the step tracking property of the adhesive after active energy ray curing under high temperature and high humidity conditions. On the other hand, the upper limit of the above content is preferably 20 parts by mass or less, more preferably 12 parts by mass or less, and particularly preferably 8 parts by mass or less, from the viewpoint of the adhesion of the adhesive after active energy ray curing.

(1-5) Photopolymerization initiator (E) When ultraviolet rays are used as 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), the active energy ray-curable component (D) can be polymerized more efficiently, and the polymerization curing time and the irradiation amount of the active energy rays can be reduced.

Examples of the photopolymerization initiator (E) include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropane-1-one, 1-hydroxycyclohexylbenzophenone, , 2-methyl-1-[4-(methylthio)phenyl]-2-oxo-propane-1-one, 4-(2-hydroxyethoxy)phenyl-2-(hydroxy-2-propyl)ketone, diphenyl ketone, p-phenyl diphenyl ketone, 4,4'-diethylamino diphenyl ketone, dichloro diphenyl ketone, 2-methyl anthraquinone, 2-ethyl anthraquinone, 2-tert-butyl anthraquinone, 2-amino anthraquinone, 2-methylthiothionyl , 2-ethylthiothioate , 2-chlorothiothionyl , 2,4-dimethylthiothioate , 2,4-Diethylthiothioate , benzyl dimethyl ketal, acetophenone dimethyl ketal, p-dimethylaminobenzoate, oligo[2-hydroxy-2-methyl-1[4-(1-methylvinyl)phenyl]propanone], 2,4,6-trimethylbenzyl-diphenyl-phosphine oxide, bis(2,4,6-trimethylbenzyl)-phenylphosphine oxide, etc. These may be used alone or in combination of two or more.

Among the above, even when UV irradiation is applied through a plastic plate containing a UV absorber, the adhesive is not easily cracked and can be easily cured. The preferred photopolymerization initiator is a phosphine oxide-based photopolymerization initiator. Specifically, 2,4,6-trimethylbenzyl-diphenyl-phosphine oxide, bis(2,4,6-trimethylbenzyl)-phenylphosphine oxide, etc. are preferred.

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

The mass ratio of the amount of the photopolymerization initiator (E) to the amount of the colorant (C) (photopolymerization initiator (E)/colorant (C)) is preferably 0.01 or more, more preferably 0.1 or more, and particularly preferably 0.2 or more. Moreover, the mass ratio is preferably 5 or less, more preferably 3 or less, and particularly preferably 1 or less. By making the ratio of the amount of the photopolymerization initiator (E) to the amount of the colorant (D) within the above range, it is easy to obtain an adhesive that satisfies the aforementioned optical properties and has better cohesion and adhesion by curing with active energy rays, and can easily become an adhesive with better step tracking performance under high temperature and high humidity conditions.

(1-6) Various additives If necessary, various additives commonly used in acrylic adhesives may be added to the adhesive composition P, such as silane coupling agents, rust inhibitors, UV absorbers, antistatic agents, adhesives, antioxidants, light stabilizers, softeners, refractive index adjusters, etc. In addition, the polymerization solvent and dilution solvent described below are not included in the additives constituting the adhesive composition P.

The adhesive composition P preferably contains a silane coupling agent. This can improve the adhesion to the adherend, whether it is a plastic plate or a glass component, and improve the step tracking performance under high temperature and high humidity conditions.

The silane coupling agent is an organic silicon compound having at least one alkoxysilyl group in the molecule, and preferably has good compatibility with the (meth)acrylate polymer (A) and is light-transmissive.

The silane coupling agent may be, for example, a polymerizable unsaturated group-containing silicon compound such as vinyl trimethoxysilane, vinyl triethoxysilane, and methacryloyloxypropyl trimethoxysilane; an epoxy structure-containing silicon compound such as 3-glycidoxypropyl trimethoxysilane and 2-(3,4-epoxycyclohexyl)ethyl trimethoxysilane; a 3-butyl trimethoxysilane, 3-butyl triethoxysilane, and 3-butyl dimethoxymethyl silane; ; 3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, N-(2-aminoethyl)-3-aminopropylmethyldimethoxysilane and other amine-containing silicon compounds; 3-chloropropyltrimethoxysilane, 3-isocyanatepropyltriethoxysilane; or a condensate of at least one of them and methyltriethoxysilane, ethyltriethoxysilane, methyltrimethoxysilane, ethyltrimethoxysilane and other alkyl-containing silicon compounds. These can be used alone or in combination of two or more.

The content of the silane coupling agent in the adhesive composition P is preferably 0.01 parts by mass or more, more preferably 0.05 parts by mass or more, and particularly preferably 0.1 parts by mass or more, relative to 100 parts by mass of the (meth)acrylate polymer (A). Moreover, the content is preferably 1 part by mass or less, more preferably 0.5 parts by mass or less, and particularly preferably 0.3 parts by mass or less. When the content of the silane coupling agent is within the above range, the obtained adhesive can satisfy the aforementioned optical properties, easily exhibit better cohesion and adhesion, and easily make the step tracking property under high temperature and high humidity conditions more excellent.

(2) Preparation of adhesive composition The adhesive composition P is prepared by preparing a (meth)acrylate polymer (A), mixing the obtained (meth)acrylate polymer (A), a crosslinking agent (B), and a coloring agent (C), and optionally adding an active energy ray-hardening component (D), a photopolymerization initiator (E), an additive, etc.

The (meth)acrylate polymer (A) can be produced by polymerizing a monomer mixture constituting the polymer using a conventional free radical polymerization method. The polymerization of the (meth)acrylate polymer (A) is preferably carried out by a solution polymerization method using a polymerization initiator as needed. However, the present invention is not limited thereto, and the polymerization can also 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, etc., and two or more thereof can also 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 compounds include 2,2'-azobisisobutyronitrile, 2,2'-azobis(2-methylbutyronitrile), 1,1'-azobis(cyclohexane-1-carbonitrile), 2,2'-azobis(2,4-dimethylvaleronitrile), 2,2'-azobis(2,4-dimethyl-4-methoxyvaleronitrile), dimethyl-2,2'-azobis(2-methylpropionate), 4,4'-azobis(4-cyanovaleric acid), 2,2'-azobis(2-hydroxymethylpropionitrile), 2,2'-azobis[2-(2-imidazolin-2-yl)propane], and the like.

Examples of organic peroxides include benzoyl peroxide, tertiary butyl perbenzoate, isopropyl hydroperoxide, diisopropyl peroxydicarbonate, di-n-propyl peroxydicarbonate, di(2-ethoxyethyl) peroxydicarbonate, tertiary butyl peroxyneodecanoate, tertiary butyl peroxytrimethylacetate, (3,5,5-trimethylhexyl) peroxide, dipropionyl peroxide, and diacetyl peroxide.

In addition, 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-hydroxyethanol.

If a (meth)acrylate polymer (A) is obtained, a crosslinking agent (B), a coloring agent (C), and, if necessary, a diluting solvent, an active energy ray-hardening component (D), a photopolymerization initiator (E), an additive, etc. are added to the solution of the (meth)acrylate polymer (A), and after thorough mixing, an adhesive composition P (coating solution) diluted with a solvent is obtained. In addition, when any of the above components is used in a solid state, or when it is mixed with other components in an undiluted state, precipitation occurs, the component may be dissolved in a diluting solvent alone in advance, or may be mixed with other components after dilution.

The above-mentioned diluent solvent can be, for example, aliphatic hydrocarbons such as hexane, heptane, and cyclohexane; aromatic hydrocarbons such as toluene and xylene; halogenated hydrocarbons such as methyl chloride and ethylene chloride; alcohols such as methanol, ethanol, propanol, butanol, and 1-methoxy-2-propanol; ketones such as acetone, methyl ethyl ketone, 2-pentanone, isophorone, and cyclohexanone; esters such as ethyl acetate and butyl acetate; cellosol-based solvents such as ethyl cellosol, etc.

The concentration and viscosity of the coating solution prepared in this way are not particularly limited as long as they are within the coating range, and can be appropriately selected according to the conditions. For example, the adhesive composition P is diluted to a concentration of 10-60% by mass. In addition, when the coating solution is obtained, it is not necessary to add a diluting solvent, etc. If the adhesive composition P has a coating viscosity, etc., no diluting solvent may be added. In this case, the adhesive composition P is directly prepared by using the polymerization solvent of the (meth)acrylate polymer (A) as a diluting solvent to form a coating solution.

(3) Formation of the colored adhesive layer The colored adhesive layer 11 of the present embodiment is preferably composed of an adhesive cross-linked with the adhesive composition P (coating layer). The cross-linking of the adhesive composition P can usually be carried out by heat treatment. In addition, the heat treatment can also be used as a drying treatment when the diluent solvent is evaporated 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., more preferably 70 to 120° C. Moreover, the heating time is preferably 10 seconds to 10 minutes, more preferably 50 seconds to 2 minutes.

After the heat treatment, a 1-2 week aging period can be designed at room temperature (e.g., 23°C, 50%RH) if necessary. If the aging period is required, the adhesive is formed after the aging period (if the aging period is not required, it is formed after the heat treatment is completed).

By utilizing the above-mentioned heat treatment (and aging), the (meth)acrylate polymer (A) is fully crosslinked through the crosslinking agent (B). The adhesive obtained in this way can easily meet the required storage modulus, gelatinization rate and adhesion, and has excellent step tracking properties under high temperature and high humidity conditions.

(4) Physical properties of adhesive The adhesive of this embodiment preferably has the following physical properties. (4-1) Gelatinization rate The lower limit of the gelatinization rate of the adhesive of this embodiment is preferably 20% or more, more preferably 40% or more, particularly preferably 50% or more, and optimally 60% or more. If the lower limit of the gelatinization rate of the adhesive is as above, the cohesive force of the adhesive can be increased, so that the step tracking property under high temperature and high humidity conditions is better. In addition, the upper limit of the gelatinization rate of the adhesive of this embodiment is preferably 100% or less, more preferably 90% or less, particularly preferably 80% or less, optimally 70% or less, and most optimally 69% or less. If the upper limit of the gelling rate of the adhesive is as above, the adhesive will not be too hard, and the initial step tracking performance and the step tracking performance under high temperature and high humidity conditions will be excellent. In addition, good adhesion can be exhibited, and the adhesion to the adherend will be better.

Here, the method for measuring the gelling rate of the adhesive is as shown in the test example described later. In the case of an active energy ray-curable adhesive, the gelling rate of the adhesive after active energy ray curing is set. In addition, in the case of an active energy ray-curable adhesive, from the viewpoint of improving the initial step tracking property, the gelling rate of the adhesive before active energy ray curing is preferably 20 to 70%, more preferably 30 to 60%, and particularly preferably 40 to 55%.

(4-2) Storage modulus The lower limit of the storage modulus of the adhesive of this embodiment at 23°C is preferably 0.001MPa or more, more preferably 0.01MPa or more, particularly preferably 0.05MPa or more, and optimally 0.1MPa or more. By setting the lower limit of the storage modulus as above, the step tracking property under high temperature and high humidity conditions is excellent. In addition, the upper limit of the storage modulus is preferably 2MPa or less, more preferably 1MPa or less, particularly preferably 0.8MPa or less, optimally 0.4MPa or less, and most optimally 0.2MPa or less. By setting the upper limit of the storage modulus as above, both the initial step tracking property and the step tracking property under high temperature and high humidity conditions are excellent.

Here, the storage modulus in this specification is a value measured by the torsion shear method at a measurement frequency of 1 Hz according to JIS K7244-6. The specifics are shown in the test examples described below. In addition, in the case of an active energy ray-curable adhesive, the storage modulus of the adhesive after active energy ray curing is set. In addition, in the case of an active energy ray-curable adhesive, from the perspective of making the initial step tracking property good, the storage modulus of the adhesive before active energy ray curing is preferably 0.01~1MPa, more preferably 0.02~0.5MPa, and particularly preferably 0.04~0.1MPa.

(5) Thickness of the coloring adhesive layer The lower limit of the thickness of the coloring adhesive layer 11 is preferably 1 μm or more, more preferably 2 μm or more, and particularly preferably 4 μm or more. If the lower limit of the thickness of the coloring adhesive layer 11 is as described above, the aforementioned formula (IV) (and formula (V)) can be easily satisfied by the relationship with the content of the coloring agent (C), and the required adhesive force can be easily exerted. In addition, from the perspective of easily exerting superior and inferior step tracking, the lower limit is preferably 10 μm or more, more preferably 20 μm or more, particularly preferably 50 μm or more, and optimally 80 μm or more.

On the other hand, the upper limit of the thickness of the colored adhesive layer 11 is preferably less than 500 μm, more preferably less than 300 μm, particularly preferably less than 200 μm, and optimally less than 150 μm. If the upper limit of the thickness of the colored adhesive layer 11 is as described above, the processability is good, and it is not easy to cause poor appearance due to pressure marks, etc. In addition, due to the relationship with the content of the colorant (C), the aforementioned formula (IV) (and formula (V)) can be easily satisfied. However, from the perspective of more easily satisfying the aforementioned formula (IV) (and formula (V)), it is more preferably less than 120 μm, particularly preferably less than 75 μm, and optimally less than 30 μm. In addition, the colored adhesive layer 11 can be formed as a single layer or as a plurality of layers.

1-2. Peeling sheet The peeling sheets 12a and 12b protect the colored adhesive layer 11 until the colored adhesive sheet 1 is used, and are peeled off when the colored adhesive sheet 1 (colored adhesive layer 11) is used. The colored adhesive sheet 1 of this embodiment does not necessarily need one or both of the peeling sheets 12a and 12b.

The peeling sheets 12a and 12b may be made of, for example, polyethylene film, polypropylene film, polybutylene film, polybutadiene film, polymethylpentene film, polyvinyl chloride film, vinyl chloride copolymer film, polyethylene terephthalate film, polyethylene naphthalate film, polybutylene terephthalate 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, fluororesin film, etc. Also, crosslinked films thereof may be used. Furthermore, laminated films thereof may also be used.

The peeling surface of the peeling sheets 12a, 12b (particularly the surface in contact with the colored adhesive layer 11) is preferably subjected to a peeling treatment. The peeling agent used in the peeling treatment may be, for example, an alkyd-based, silicone-based, fluorine-based, unsaturated polyester-based, polyolefin-based, wax-based peeling agent. In addition, it is preferred that one of the peeling sheets 12a, 12b is a heavy-peeling type peeling sheet with a larger peeling force, and the other peeling sheet is a light-peeling type peeling sheet with a smaller peeling force.

There is no particular limitation on the thickness of the peeling sheets 12a, 12b, and the thickness is usually about 20-150 μm.

2. Physical properties (adhesion) The lower limit of the adhesion of the colored adhesive sheet 1 of this embodiment to the sodium calcium glass is preferably 1N/25mm or more, more preferably 2N/25mm or more, particularly preferably 4N/25mm or more, and most preferably 8N/25mm or more. If the lower limit of the adhesion is as described above, the step tracking property under high temperature and high humidity conditions is better. In addition, the upper limit of the adhesion of the colored adhesive sheet 1 of this embodiment to the sodium calcium glass is preferably 80N/25mm or less, more preferably 50N/25mm or less, and particularly preferably 30N/25mm or less. If the upper limit of the adhesion is as described above, good reworkability can be obtained, and when a bonding error occurs, the display component (especially the high-priced display component) can be reused.

Here, the "adhesion" in this manual basically refers to the adhesion measured by the 180-degree pull-peel method according to JIS Z0237:2009. The test sample is set to be 25mm wide and 100mm long. The test sample is attached to the adherend, and after being pressed at 0.5MPa and 50℃ for 20 minutes, it is placed under normal pressure, 23℃, and 50%RH for 24 hours, and then measured at a peeling speed of 300mm/min. In the case of active energy ray-curable adhesives, it is set to the adhesion of the colored adhesive layer hardened by active energy rays after the adherend is attached. In addition, in the case of active energy ray-curable adhesives, from the perspective of adhesion to the adherend and workability, the adhesive force of the adhesive before active energy ray curing is preferably 1~80N/25mm, more preferably 2~50N/25mm, and particularly preferably 4~30N/25mm.

3. Production of colored adhesive sheet In one example of the production of the colored adhesive sheet 1, a coating solution of the above-mentioned adhesive composition P is applied on the peeling surface of one of the peeling sheets 12a (or 12b), and a heat treatment is performed to allow the adhesive composition P to be thermally crosslinked to form a coating layer, and then the peeling surface of another peeling sheet 12b (or 12a) is superimposed on the coating layer. When a ripening period is required, after the ripening period (and directly when the ripening period is not required), the above-mentioned coating layer is used as the colored adhesive layer 11. In this way, the above-mentioned colored adhesive sheet 1 is obtained. The relevant heat treatment and ripening conditions are as described above.

In another manufacturing example of the colored adhesive sheet 1, a coating solution of the adhesive composition P is applied on the peeling surface of one peeling sheet 12a, and a heat treatment is performed to make the adhesive composition P undergo thermal crosslinking to form a coating layer, thereby obtaining a peeling sheet 12a having a coating layer. In addition, a coating solution of the adhesive composition P is applied on the peeling surface of another peeling sheet 12b, and a heat treatment is performed to make the adhesive composition P undergo thermal crosslinking to form a coating layer, thereby obtaining a peeling sheet 12b having a coating layer. Then, the peeling sheet 12a with a coating layer and the peeling sheet 12b with a coating layer are bonded together in such a way that the two coating layers are in contact with each other. In this way, a plurality of peeling sheets with coating layers can be produced, and the coating layers can be bonded together in the required quantity. When a ripening period is required, after the ripening period (and directly when the ripening period is not required), the above-mentioned coated layer is set as the colored adhesive layer 11. In this way, the above-mentioned colored adhesive sheet 1 is obtained. According to this manufacturing example, even if the colored adhesive layer 11 is thick, it can still be manufactured stably.

The coating method of the coating solution of the adhesive composition P may be, for example, rod coating, knife coating, roller coating, scraper coating, die coating, gravure coating, etc.

[Display] A display according to one embodiment of the present invention comprises: a first display component having at least two different brightness regions in a planar direction, a second display component, and a colored adhesive layer formed by bonding the first display component and the second display component to each other. The display body of the present embodiment is defined by the CIE1976 L*a*b* color system. When the brightness L* of one region R1 of the first display body is set to L1, the brightness L* of another region R2 is set to L2, the brightness L* of the region R1 where the colored adhesive layer is deposited is set to L1’, and the brightness L* of the region R2 where the colored adhesive layer is deposited is set to L2’, the following equations (I) to (IV) are satisfied: ΔL=L1-L2                … (I) ΔL’=L1’-L2’            … (II) ΔL＞0                      … (III) (ΔL’/ΔL)×100≦80  … (IV)

The types of display bodies (displays) of this embodiment include, for example, car dashboards, car navigation systems, various meters installed on control consoles, etc.; tablet terminals for general users, etc.; commercial tablet terminals, electronic billboards, etc.; outdoor electronic billboards, etc. Such display bodies are required to be harmonious with the appearance of surrounding components, have a sense of luxury, etc. However, the display body of the present invention is not limited to these.

An example of the display body of this embodiment is specifically configured as shown in FIG2. As shown in FIG2, the display body 2 of this embodiment comprises: a first display body component 21 (one of the display body components), a second display body component 22 (another display body component), and a colored adhesive layer 11 disposed therebetween to bond the first display body component 21 to the second display body component 22.

At least one of the first display body component 21 and the second display body component 22 may also be provided with a step difference on at least one side of the side to be bonded by the colored adhesive layer 11. In the embodiment shown in FIG2 , the first display body component 21 is provided with a step difference such as a printed layer 3 on one side close to the colored adhesive layer 11. In this case, the first display body component 21 forms at least two areas with different brightness in the plane direction by the area of the printed layer 3 and other areas.

The colored adhesive layer 11 of the display 2 is preferably the colored adhesive layer 11 of the colored adhesive sheet 1, but is not limited thereto if the above-mentioned physical properties are satisfied.

The display 2 may be, for example, a liquid crystal (LCD) display, a light emitting diode (LED) display, an organic electroluminescent (organic EL) display, electronic paper, etc., or may be a touch panel.

The first display body component 21 is preferably a protective panel composed of a laminate containing the glass plate, plastic plate, etc. In this case, the general printed layer 3 is formed in a frame shape on one side of the first display body component 21 close to the color adhesive layer 11.

The glass plate is not particularly limited, and examples thereof include chemically strengthened glass, alkali-free glass, quartz glass, sodium calcium glass, barium-strontium glass, aluminum silicate glass, lead glass, borosilicate glass, barium borosilicate glass, etc. The thickness of the glass plate is not particularly limited, and is generally 0.1 to 5 mm, preferably 0.2 to 2 mm.

The plastic plate is not particularly limited, and may be, for example, an acrylic plate, a polycarbonate plate, etc. The thickness of the plastic plate is not particularly limited, and is usually 0.2-5 mm, preferably 0.4-3 mm.

In addition, various functional layers (transparent conductive film, metal layer, silicon dioxide layer, hard coating layer, anti-glare layer, etc.) may be provided on one or both sides of the glass plate or plastic plate, and optical components may be laminated. Furthermore, the transparent conductive film and metal layer may be patterned.

The second display component 22 is preferably an optical component to be attached to the first display component 21, a display module [for example, a liquid crystal (LCD) module, a light-emitting diode (LED) module, an organic electroluminescent (organic EL) module, etc.], an optical component that is a part of the display module, or a laminate containing a display module.

Examples of the optical components include anti-scattering films, polarizing plates (polarizing films), polarizing elements, phase difference plates (phase difference films), viewing angle compensation films, brightness enhancement films, contrast enhancement films, liquid crystal polymer films, diffusion films, semi-transmissive reflective films, transparent conductive films, etc. Examples of the anti-scattering films include hard coating films formed on one side of a substrate film, etc.

There is no particular limitation on the material constituting the printing layer 3, and known materials for printing can be used. The lower limit of the thickness of the printing layer 3 (i.e., the height of the step) is preferably 3 μm or more, more preferably 5 μm or more, particularly preferably 7 μm or more, and optimally 10 μm or more. By having the lower limit being above, it is possible to fully ensure that the electrical wiring cannot be seen from the viewer's end. In addition, the upper limit is preferably 50 μm or less, more preferably 35 μm or less, particularly preferably 25 μm or less, and optimally 20 μm or less. By having the upper limit being below the above, it is possible to prevent the deterioration of the step tracking property of the colored adhesive layer 11 to the printing layer 3.

The printed layer 3 is preferably black. The brightness L*, chromaticity a* and chromaticity b* of the printed layer 3 are set to be the same as the preferred range of the color tone of the aforementioned peripheral components according to the CIE1976 L*a*b* color system. However, it is usually different from the color tone of the automobile instrument panel, display frame material, etc.

When manufacturing the display 2, one example is to tear off one of the release sheets 12a of the colored adhesive sheet 1, and to adhere the exposed colored adhesive layer 11 of the colored adhesive sheet 1 to the surface of the first display component 21 on which the printed layer 3 is provided.

Then, another release sheet 12b is torn off from the colored adhesive layer 11 of the colored adhesive sheet 1, and the exposed colored adhesive layer 11 of the colored adhesive sheet 1 is bonded to the second display body component 22. In another example, the bonding order of the first display body component 21 and the second display body component 22 can also be changed.

When the colored adhesive layer 11 is active energy ray-curable, as described above, after the first display body component 21 and the second display body component 22 are bonded together via the colored adhesive layer 11, the active energy ray is irradiated to the colored adhesive layer 11. As a result, the energy ray-curable component (C) in the colored adhesive layer 11 is polymerized, and the colored adhesive layer 11 is cured. When the colored adhesive layer 11 is irradiated with energy ray, it is usually carried out across either the first display body component 21 or the second display body component 22, and preferably across the first display body component 21 used as a protective panel.

The so-called "active energy rays" refer to those with energy quanta in electromagnetic waves or charged particle beams, such as ultraviolet rays and electron beams. Among active energy rays, ultraviolet rays are preferred because they are easy to handle.

Ultraviolet irradiation can be performed using a high-pressure mercury lamp, a Fusion H lamp, a xenon lamp, etc., and the ultraviolet irradiation amount is preferably about 50 to 1000 mW/cm ² , more preferably about 100 to 500 mW/cm ^2. In addition, the light intensity is preferably 50 to 10000 mJ/cm ² , more preferably 200 to 7000 mJ/cm ² , and particularly preferably 500 to 3000 mJ/cm ^2. On the other hand, electron beam irradiation can be performed using an electron beam accelerator, etc., and the electron beam irradiation amount is preferably about 10 to 1000 krad.

Here, as shown in FIG. 3 , the display body 2 (first display body component 21) of this embodiment is preferably provided with a frame material 4 at the periphery of the display body 2 (first display body component 21). In this case, the first display body component 21 is formed by the area of the frame material 4 and other areas to form at least two areas with different brightness in the plane direction. In addition, the area outside the frame material 4 (the inner area of the frame material 4) can also be formed by the area of the aforementioned printed layer 3 and other areas to form at least two areas with different brightness in the plane direction.

The frame material 4 is preferably black. In addition, the color tone of the frame material 4 is in the preferred range of brightness L*, chromaticity a* and chromaticity b* as specified by the CIE1976 L*a*b* color system, and the color tone of the surrounding components is the same as described above. By having the frame material 4 with the above color tone, it can be easily identified as a frame material with a high-end visual sense by the naked eye. In addition, the colored adhesive layer 11 of this embodiment increases the sense of integration with the frame material 4 by having the above color tone of the frame material 4, making the appearance more harmonious.

In the display body 2, the physical properties of the colored adhesive layer 11 can improve the style when the light is off. For example, when the display body 2 is off, the boundary with the black frame material 4 is not easily visible (seamless), which can show excellent appearance harmony. In addition, when there is a black printed layer inside the frame material 4 of the display body 2, when the display body 2 is off, the boundary between the display part of the display body 2 and the printed layer, and the boundary between the printed layer and the frame material 4 are not easily visible.

Furthermore, in the above-mentioned display body 2, when the colored adhesive layer 11 is formed by the adhesive composition P, because the colored adhesive layer 11 has excellent step tracking performance under high temperature and high humidity conditions, even if the display body 2 is placed under high temperature and high humidity conditions (for example, 85°C, 85%RH), floating, peeling, etc. near the step can be suppressed.

The above-mentioned step tracking performance can be judged by using the step tracking rate (%) as an index. The lower limit of the step tracking rate (%) of the colored adhesive layer 11 is preferably 10% or more, more preferably 20% or more, particularly preferably 40% or more, optimally 50% or more, and most optimally 60% or more as shown in the following formula. In addition, the upper limit of the step tracking rate is not particularly limited, and is usually preferably 80% or less, and more preferably 70% or less. Step tracking rate (%) = {(step height (μm) that remains buried without bubbles, floating, peeling, etc. after a given durability test)/(thickness of the colored adhesive layer)}×100 In addition, the test method of the step tracking rate is as described in the test example below.

The embodiments described above are recorded to facilitate understanding of the present invention, and are not recorded to limit the present invention. Therefore, the various elements disclosed in the embodiments described above cover all design changes and equivalents within the technical scope of the present invention.

For example, either or both of the release sheets 12a, 12b of the colored adhesive sheet 1 may be omitted, and the release sheets 12a and/or 12b may be replaced by optical components required for lamination. In addition, the first display component 21 may not have a step. In addition, not only the first display component 21 but also the second display component 22 may have a step on one side of the colored adhesive layer 11. [Example]

Hereinafter, the present invention will be described in more detail using embodiments and the like, however, the scope of the present invention is not limited to these embodiments and the like.

[Example 1] 1. Preparation of (meth)acrylate polymer 70 parts by mass of 2-ethylhexyl acrylate, 15 parts by mass of methyl methacrylate, and 15 parts by mass of 2-hydroxyethyl acrylate were copolymerized by solution polymerization to prepare (meth)acrylate polymer (A). The molecular weight of the (meth)acrylate polymer (A) was measured by the method described below, and the weight average molecular weight (Mw) was 800,000.

2. Preparation of adhesive composition 100 parts by weight (solid content conversion value; the same applies hereinafter) of the (meth)acrylate polymer (A) obtained in step 1 above, 0.2 parts by weight of trihydroxymethylpropane-modified toluene diisocyanate (BHS8515 manufactured by TOYOCHEM) as a crosslinking agent (B), 0.4 parts by weight of a carbon black pigment (C1) as a coloring agent (C), and 0.2 parts by weight of 3-glycidoxypropyltrimethoxysilane as a silane coupling agent were mixed, stirred thoroughly, and diluted with methyl ethyl ketone to obtain a coating solution of the adhesive composition.

Here, when the (meth)acrylate polymer (A) is set to 100 parts by mass (solid conversion value), the blending (solid conversion value) of each adhesive composition is shown in Table 1. In addition, the details of the codes etc. recorded in Table 1 are as follows. [(meth)acrylate polymer (A)] 2EHA: 2-ethylhexyl acrylate MMA: methyl methacrylate HEA: 2-hydroxyethyl acrylate IBXA: isoborneol acrylate ACMO: N-acryloyl phthalate BA: n-butyl acrylate AA: acrylic acid [Coloring agent (C)] C1~C5: Carbon black-based black pigments having the properties shown in Table 2

3. Preparation of colored adhesive sheet The coating solution of the adhesive composition obtained in step 2 was coated on the peeling surface of a heavy-peel release sheet (manufactured by Lintec, product name "SP-PET752150") on one side of a polyethylene terephthalate film that had been peeled with a silicone-based release agent using a knife coater, and then heated at 90°C for 1 minute to form a coating layer (thickness: 50μm). Similarly, the coating solution of the adhesive composition obtained in step 2 was coated on the peeling-treated surface of a light-peel release sheet (manufactured by Lintec, product name "SP-PET381130") on one side of a polyethylene terephthalate film that had been peeled with a silicone-based peeling agent using a knife coater, and then heat-treated at 90°C for 1 minute to form a coating layer (thickness: 50 μm).

Next, the heavy-peel release sheet with a coating layer obtained as described above and the light-peel release sheet with a coating layer obtained as described above were laminated in a manner such that the two coating layers were in contact with each other, and aged for 7 days at 23° C. and 50% RH to prepare a colored adhesive sheet consisting of a heavy-peel release sheet/a colored adhesive layer (thickness: 100 μm)/a light-peel release sheet.

The thickness of the colored adhesive layer is a value measured in accordance with JIS K7130 using a constant pressure thickness tester (manufactured by TECLOCK, product name "PG-02").

[Examples 2 to 8, Comparative Example 1] Except that the types and proportions of the monomers constituting the (meth)acrylate polymer (A), the weight average molecular weight (Mw) of the (meth)acrylate polymer (A), the type and blending amount of the colorant (C), the blending amount of the silane coupling agent, and the thickness of the coloring adhesive layer were changed as shown in Table 1, the rest was the same as in Example 1 to produce a coloring adhesive sheet. However, in Example 5, 5.0 parts by weight of ε-caprolactone-modified 3-(2-acryloyloxyethyl) tris(isocyanate) (manufactured by Shin-Nakamura Chemical Co., Ltd., product name "NKester A-9300-1CL") as an active energy ray-curable component (D) and 0.5 parts by weight of 2,4,6-trimethylbenzyl-diphenyl-phosphine oxide as a photopolymerization initiator (E) were further added to obtain an active energy ray-curable adhesive. Comparative Example 1 did not use a colorant (C), and for convenience, the terms "colored adhesive layer" and "colored adhesive sheet" were used.

In addition, the colored adhesive sheets of Examples 2 to 8 and Comparative Example 1 were prepared as follows. In the same manner as in Example 1, the prepared coating solution of the adhesive composition was coated on the peeling surface of a heavy-peel release sheet (manufactured by Lintec, product name "SP-PET752150"), one side of which was subjected to a peeling treatment using a silicone-based peeling agent, using a knife coater, and then heat-treated at 90° C. for 1 minute to form a coating layer. The obtained heavy-peel release sheet with a coating layer was subjected to peeling treatment on one side thereof and the peeling treatment side of a light-peel release sheet (manufactured by Lintec, product name "SP-PET381130") on one side of a polyethylene terephthalate film which was subjected to peeling treatment using a silicone-based peeling agent, and then aged for 7 days at 23°C and 50% RH to prepare a colored adhesive sheet consisting of a heavy-peel release sheet/a colored adhesive layer/a light-peel release sheet.

The weight average molecular weight (Mw) is the polystyrene-converted weight average molecular weight measured by gel permeation chromatography (GPC) under the following conditions (GPC measurement). ＜Measurement conditions＞ . GPC measurement device: HLC-8020 manufactured by Tosoh Corporation . GPC column (passed in the following order): manufactured by Tosoh Corporation TSK guard column HXL-H TSK gel GMHXL (×2) TSK gel G2000HXL . Measurement solvent: tetrahydrofuran . Measurement temperature: 40°C

[Test Example 1] (Measurement of the haze value of the colorant dilution) For the colorants of C1~C5, the haze value (%) was measured using a haze meter (manufactured by Nippon Denshoku Industries, product name "SH-7000", optical path 10mm) diluted 10,000 times with ethyl acetate according to JIS K7136:2000. From the measured value, the difference between the haze value at a wavelength of 780nm and the haze value at a wavelength of 380nm, the average haze of the haze value at a wavelength of 780nm and the average of the haze value at a wavelength of 380nm, and the standard deviation of the haze value at each wavelength with an interval of 5nm in the wavelength range of 380nm~780nm were calculated. The results are shown in Table 2.

[Test Example 2] (Gelation Rate Measurement) The colored adhesive sheets obtained in the Example and the Comparative Example were cut into 80 mm × 80 mm size, and the colored adhesive layer was wrapped in a polyester mesh (mesh size 200), and the mass was measured using a precision balance. The mass of the adhesive alone was calculated by deducting the mass of the mesh alone. The mass at this time was set as M1.

Secondly, the adhesive contained in the polyester mesh was immersed in ethyl acetate at room temperature (23°C) for 24 hours. Then the adhesive was taken out and air-dried for 24 hours at a temperature of 23°C and a relative humidity of 50%, and then dried in an oven at 80°C for 12 hours. After drying, the mass was weighed using a precision balance, and the mass of the adhesive alone was calculated by deducting the mass of the mesh alone. The mass at this time was set as M2. The gelatinization rate (%) was expressed as (M2/M1)×100. The results are shown in Table 3.

In addition, for the colored adhesive sheet of Example 5, a plastic sheet (Mitsubishi Gas Chemical Co., Ltd., product name "Iupilon.sheet MR58U", thickness: 0.7 mm, containing ultraviolet absorber) in which a polymethyl methacrylate resin (PMMA) layer is laminated on a polycarbonate resin (PC) sheet is placed on a light peeling peeling sheet, and active energy rays are irradiated across the plastic sheet under the following conditions to cure the colored adhesive layer. The adhesive of the cured colored adhesive layer is derived in the same manner as above (after UV).

<Active energy ray irradiation conditions> ．Using high-pressure mercury lamp. Illuminance 200mW/ ^cm2 , light quantity 2000mJ/ ^cm2 ．UV illuminance. The light meter used was "UVPF-A1" manufactured by EYE GRAPHICS

[Test Example 3] (Determination of storage modulus) The peeling sheet was torn off from the colored adhesive sheet obtained in the embodiment and the comparative example, and a plurality of layers of colored adhesive layers were laminated to a thickness of 3 mm. A cylinder with a diameter of 8 mm (height 3 mm) was punched out from the laminate of the obtained colored adhesive layer and used as a sample.

For the above samples, according to JIS K7244-6, the storage modulus (MPa) was measured using a viscoelasticity measuring device (manufactured by Physica, product name "MCR300") using the torsional shear method under the following conditions. The results are shown in Table 3. Measurement frequency: 1Hz Measurement temperature: 23℃

In addition, the colored adhesive sheet of Example 5 was irradiated with active energy rays in the same manner as in Test Example 2 to cure the colored adhesive layer, and the storage modulus (after UV) of the cured colored adhesive layer was measured in the same manner as above.

[Test Example 4] (Determination of haze value) The haze value (%) of the colored adhesive layer of the colored adhesive sheet obtained in the embodiment and the comparative example was measured using a haze meter (manufactured by Nippon Denshoku Industries, product name "SH-7000") in accordance with JIS K7136:2000. The obtained total light haze value (%) is shown in Table 3. In addition, the following were calculated from the measured values: the average haze of the average value of the haze value at a wavelength of 780nm and the haze value at a wavelength of 380nm, the difference between the haze value at a wavelength of 780nm and the haze value at a wavelength of 380nm, and the standard deviation of the haze value at each wavelength with an interval of 5nm in the wavelength range of 380nm to 780nm. The results are shown in Table 3.

In addition, for the colored adhesive sheet of Example 5, the colored adhesive layer was cured by irradiating active energy rays in the same manner as in Test Example 2, and the full light haze value (after UV) of the cured colored adhesive layer was measured as described above. Then, the average haze value (after UV) of the average value of the haze value at a wavelength of 780nm and the haze value at a wavelength of 380nm, the difference between the haze value at a wavelength of 780nm and the haze value at a wavelength of 380nm (after UV), and the standard deviation of the haze value at each wavelength with a distance of 5nm in the wavelength range of 380nm to 780nm (after UV) were calculated from the measured values. The results are shown in Table 3.

[Test Example 5] (Determination of total light transmittance) The colored adhesive layer of the colored adhesive sheet obtained in the embodiment and the comparative example was attached to glass and used as a sample for measurement. The background measurement was performed using the glass, and the total light transmittance (%) of the above-mentioned sample for measurement was measured using a haze meter (manufactured by Nippon Denshoku Industries, product name "SH-7000") in accordance with JIS K7361-1:1997. In addition, the colored adhesive sheet of Example 5 was irradiated with active energy rays in the same manner as in Test Example 2 to cure the colored adhesive layer, and then the total light transmittance (after UV) of the cured colored adhesive layer was measured as described above. The results are shown in Table 3.

[Test Example 6] (L*a*b* measurement of colored adhesive layer) For the colored adhesive layer of the colored adhesive sheets obtained in the examples and comparative examples, the brightness L*, chromaticity a* and chromaticity b* specified in the CIE1976 L*a*b* colorimetric system were measured using a spectrophotometer (manufactured by Nippon Denshoku Industries, product name "SQ2000"). In addition, for the colored adhesive sheet of Example 5, the colored adhesive layer was cured by irradiating active energy rays in the same manner as in Test Example 2, and then the brightness L* (after UV), chromaticity a* (after UV) and chromaticity b* (after UV) of the cured colored adhesive layer were measured as described above. The results are shown in Table 3.

[Test Example 7] (Adhesion Measurement) The light-peel-off type peeling sheet was torn off from the colored adhesive sheet obtained in the embodiment and the comparative example, and the exposed colored adhesive layer was adhered to the easy-adhesion layer of a polyethylene terephthalate (PET) film (manufactured by Toyobo Co., Ltd., product name "PET A4300", thickness: 100μm) provided with an easy-adhesion layer to obtain a laminate of peeling sheet/colored adhesive layer/PET film. The obtained laminate was cut into a width of 25mm and a length of 100mm and used as a sample.

At 23°C and 50%RH, the heavy-peel release sheet was peeled off from the above sample, and the exposed colored adhesive layer was attached to sodium calcium glass (manufactured by Nippon Sheet Glass Co., Ltd.), and then pressurized at 0.5MPa and 50°C for 20 minutes using a hot press manufactured by Kurihara Seisakusho Co., Ltd. Then, it was placed at 23°C and 50%RH for 24 hours, and the adhesive force (N/25mm) was measured using a tensile tester (manufactured by ORIENTEC Co., Ltd., product name "Tensor") at a peeling speed of 300mm/min and a peeling angle of 180 degrees. The other conditions except those described here were measured according to JIS Z0237:2009. The results are shown in Table 3.

In addition, for the colored adhesive sheet of Example 5, the colored adhesive layer was attached to a sodium calcium glass in the same manner as above, and after being subjected to autoclave treatment, it was placed under 23°C and 50% RH conditions for 24 hours, and then irradiated with active energy rays in the same manner as in Test Example 2 to cure the colored adhesive layer. The adhesive force (after UV) of the cured colored adhesive layer was also measured in the same manner as above.

[Test Example 8] (Measurement of step tracking rate) On the surface of a glass plate (manufactured by NSG PRECISION, product name "Corning Glass EAGLE XG", 90 mm long × 50 mm wide × 0.5 mm thick), a UV curable ink (manufactured by Teikoku Printing Ink Co., Ltd., product name "POS-911 ink") was screen printed in a frame shape (outer shape: 90 mm long × 50 mm wide, 5 mm thick). Then, the printed UV curable ink was cured by irradiation with UV rays (80 W/cm ² , 2 metal halogen lamps, lamp height 15 cm, belt speed 10-15 m/min), and a step-shaped glass plate having steps (step height: any one of 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 50 μm, 60 μm and 70 μm) by printing was produced.

A light-peel release sheet was torn off from the colored adhesive sheet obtained in the embodiment and the comparative example, and the exposed colored adhesive layer was then bonded to the easy-bonding layer of a polyethylene terephthalate film (manufactured by Toyobo Co., Ltd., product name "PET A4300", thickness: 100 μm) having an easy-bonding layer. Next, a heavy-peel release sheet was torn off to expose the colored adhesive layer. Then, using a laminating press (manufactured by FUJIPURA Co., Ltd., product name "LPD3214"), the above-mentioned laminated volume was laminated on a glass plate with various steps in such a manner that the colored adhesive layer covered the entire surface of the frame-like print, and it was set as a sample for evaluation.

The obtained evaluation samples were subjected to hot-pressing treatment for 30 minutes at 50°C and 0.5MPa, and then placed at normal pressure, 23°C, and 50%RH for 24 hours. Then, they were stored at high temperature and high humidity conditions of 85°C and 85%RH for 72 hours (durability test), and then the step tracking performance was evaluated. The step tracking performance is judged by whether the printed step is completely buried by the colored adhesive layer. When bubbles, floating, peeling, etc. are observed at the interface between the printed step and the colored adhesive layer, it is judged that the printed step cannot be tracked. Here, the step tracking performance is evaluated according to the step tracking rate (%) shown in the following formula. The results are shown in Table 3. Step tracking rate (%) = {(After the durability test, there is no bubble, floating, peeling, etc., and the step height maintained in the buried state (μm))/(the thickness of the coloring adhesive layer)}×100

In addition, for the colored adhesive sheet of Example 5, a colored adhesive layer with a thickness of 25 μm was prepared, and the evaluation sample obtained in the same manner as above was subjected to hot-pressing treatment, and then placed under 23° C. and 50% RH conditions for 24 hours, and then irradiated with active energy rays in the same manner as in Test Example 2 to cure the colored adhesive layer. The step tracking property (after UV) of the cured colored adhesive layer was evaluated in the same manner as above.

[Test Example 9] (Measurement and calculation of brightness L*) The background is printed on one side of each paper (length 100mm×width 100mm): black background A (L*: 64.4, a*: -0.4, b*: 0.2), black background B (L*: 48.3, a*: 0.3, b*: -0.3), and black background C (L*: 27.9, a*: -0.2, b*: -0.1), and three kinds of black substrates (black substrates with black backgrounds A~C) are obtained. In addition, the color tone (L*a*b* specified in the CIE1976 L*a*b* color system) of the black background A~C of each black substrate is measured using a spectrophotometer (manufactured by BYK, product name "Spectroguide") (reflected light from the incident light at the end of the black background). The luminance L* of the black background A is denoted as _LA , the luminance L* of the black background B is denoted as _LB , and the luminance L* of the black background C is denoted as _LC . The measured values are shown in Table 4.

On the other hand, the colored adhesive sheets obtained in the examples and comparative examples were cut into 70 mm long × 70 mm wide, and the colored adhesive layer of the colored adhesive sheets was sandwiched between two pieces of sodium calcium glass (manufactured by Nippon Sheet Glass Co., Ltd., 70 mm long × 70 mm wide × 1.1 mm thick) to prepare samples. In addition, the colored adhesive sheet of Example 5 was irradiated with active energy rays in the same manner as in Test Example 2 to cure the colored adhesive layer to prepare samples.

The obtained samples were layered on the above three black substrates, and the respective brightness L* (reflected light from the incident light at the sample end) was measured using a spectrophotometer (manufactured by BYK, product name "spectro guide"). The brightness L* of the black background A with the colored adhesive layer layered is represented as " _LA '", the brightness L* of the black background B with the colored adhesive layer layered is represented as " _LB '", and the brightness L* of the black background C with the colored adhesive layer layered is represented as " _LC '". The results are shown in Table 4.

Furthermore, the following values were calculated from the above measurement results. The results are shown in Table 4. ． ΔL _AC = _LA - _{LC ．} ΔL _AC '= LA '- _LC ' ． (ΔL _AC '/ΔL _AC )×100 ． ΔL _AB = LA - _{LB ．} ΔL _AB '= LA _' - _LB ' ． (ΔL _AB '/ΔL _AB )×100 ． ΔL _BC = _LB - _{LC ． ΔL BC} '= LB _' - _LC ' ． (ΔL _BC '/ΔL _BC )×100

[Test Example 10] (Style Evaluation) Using the black substrates with black backgrounds A to C obtained in the same manner as in Test Example 9, the following three types of borders were formed. Border (A/C): On the black substrate with black background A, a black substrate with black background C was arranged in a staggered state to form a border (A/C) between the black background A and the black background C. Border (A/B): On the black substrate with black background A, a black substrate with black background B was arranged in a staggered state to form a border (A/B) between the black background A and the black background B. Border (B/C): On the black substrate with black background B, a black substrate with black background C was arranged in a staggered state to form a border (B/C) between the black background B and the black background C.

Next, samples made in the same manner as in Test Example 9 were placed on a black background with a border. Under a 3-wavelength fluorescent lamp (distance from the fluorescent lamp: 200 cm), the appearance of the border (whether the border is conspicuous, whether the black backgrounds blend with each other) was visually judged, and the seamless style was evaluated according to the following criteria. The results are shown in Table 4. ◎: The border is almost inconspicuous and blends with each other. ○: Although the border is slightly visible, it is not a problem and blends with each other. ×: The border is obvious and does not blend with each other.

[Test Example 11] (Evaluation of text visibility) On a 15.6-inch monitor with a resolution of 1366×768 (manufactured by Fujitsu, product name "LITEBOOK A574/H"), 100% white text (numbers, font: MS P Gothic) with a size of 5 to 20 points (scale 1 point) was displayed against a black background.

The sample produced in Test Example 9 was placed on the above display. Then, at a distance of 100 cm from the display, the size of the text that can be visually recognized was confirmed, and the text visibility was evaluated according to the following criteria. The results are shown in Table 4. ◎: 8-point text can be recognized without any problem. ○: Although 8-point text cannot be fully recognized, 10-point text can be recognized without any problem. ×: 10-point text is more difficult to recognize.

[Test Example 12] (Wide-angle visibility evaluation) The sample made in the same way as in Test Example 9 was placed in front of a lighted display (manufactured by Fujitsu, product name "LITEBOOK A574/H", size 15.6 inches, resolution 1366×768). At this time, the ARIB multi-format color bar was displayed on the display. Then, under a 3-wavelength fluorescent light (distance from the fluorescent light: 200cm), the appearance of the display across the sample was visually judged from the front and oblique direction (45° angle) of the sample, and the visibility (wide-angle visibility) was evaluated according to the following criteria. The results are shown in Table 4. ◎: The appearance seen from the front and the appearance seen from the oblique direction do not change. ○: The appearance when viewed from an angle is darker than when viewed from the front, but the color does not change. ×: The appearance when viewed from the front and when viewed from an angle changes color.

In addition, in all cases, the screen is bright when viewed from the front, so the image visibility is good due to the screen brightness.

[Table 1] (Meth)acrylate polymer (A) Crosslinking agent (B) Coloring agent (C) Active energy ray-hardening ingredient (D) Photopolymerization initiator (E) Silane coupling agent Color adhesive layer thickness [μm] Composition M Quality Type Quality Quality Quality Quality Embodiment 1 2EHA/MMA/HEA =70/15/15 800,000 0.2 C1 0.4 - - 0.2 100 Embodiment 2 0.2 C2 0.9 - - 0.2 25 Embodiment 3 2EHA/IBXA/ACMO/HEA =60/10/10/20 600,000 0.2 C1 1.5 - - 0.2 25 Embodiment 4 BA/AA/HEA=90/1/9 500,000 0.2 C1 1.5 - - 0.2 25 Embodiment 5 2EHA/MMA/HEA =70/15/15 800,000 0.2 C2 1.0 5.0 0.5 0.2 5 Embodiment 6 0.2 C3 0.5 - - 0.2 25 Embodiment 7 0.2 C4 0.5 - - 0.2 25 Embodiment 8 0.2 C5 0.5 - - - 25 Comparison Example 1 0.2 - - - - 0.2 25

[Table 2] Colorant Type 380nm haze value (%) 780nm haze value (%) Fog value difference (points) Average fog density (%) Fog value standard deviation C1 25.0 23.7 1.3 24.89 0.48 C2 10.1 2.3 7.8 4.11 1.49 C3 9.6 2.6 7.0 5.31 2.03 C4 19.0 3.8 15.2 9.20 4.31 C5 47.8 20.6 27.2 32.56 7.99

[table 3] Gelatinization rate (%) Storage elastic modulus (MPa) Fog value Total light transmittance (%) Color System Adhesion force (N/25mm) Segment tracking rate (%) 380nm haze value (%) 780nm haze value (%) Fog value difference (points) Average fog density (%) Fog value standard deviation Full light haze value (%) L* a* b* Embodiment 1 68 0.13 13.9 8.4 5.5 10.9 1.6 11.2 77.5 90.5 0.2 0.5 26 60 Embodiment 2 69 0.13 5.9 1.1 4.8 3.2 1.7 4.0 48.2 87.5 -0.5 -0.4 16 60 Embodiment 3 69 0.13 32.2 23.3 8.9 27.9 2.6 28.5 52.3 77.5 0.4 0.9 twenty one 60 Embodiment 4 68 0.13 22.7 13.2 9.5 17.8 2.8 18.3 63.1 83.5 0.4 0.9 41 40 Embodiment 5 Before UV: 50 After UV: 67 Before UV: 0.08 After UV: 0.12 5.9 1.3 4.6 2.4 0.9 2.2 65.3 84.7 -1.1 0.1 Before UV: 7 After UV: 8 60 Embodiment 6 68 0.13 11.9 3.5 8.4 6.7 2.4 6.6 51.9 77.1 1.2 5.7 16 40 Embodiment 7 68 0.13 6.3 1.3 5.0 3.0 1.4 2.9 61.4 82.4 1.2 5.2 18 40 Embodiment 8 69 0.12 26.2 8.4 17.8 15.4 5.1 15.6 29.2 60.8 1.7 5.5 16 40 Comparison Example 1 70 0.14 0.3 0.3 0.0 0.3 0.0 0.3 ≧99 100 0.0 0.0 twenty two 40

[Table 4] L _A ' L _B ' L _C ' ΔL _AC ' (ΔL _AC '/ΔL _AC ) ×100(%) ΔL _AB ' (ΔL _AB '/ΔL _AB ) ×100(%) ΔL _BC ' (ΔL _BC '/ΔL _BC ) ×100(%) Style Text visibility Wide-angle viewing Boundary (A/C) Boundary (A/B) Boundary (B/C) Embodiment 1 28.6 22.6 12.4 16.2 44.4 6.0 37.3 10.2 50.0 ○ ◎ ○ ◎ ◎ Embodiment 2 26.4 20.7 12.9 13.5 37.0 5.7 35.5 7.8 38.1 ◎ ◎ ◎ ◎ ◎ Embodiment 3 27.6 21.3 11.4 16.2 44.4 6.3 39.3 9.9 48.5 ○ ◎ ○ ○ ○ Embodiment 4 36.4 27.7 16.6 19.8 54.4 8.7 54.1 11.1 54.6 ○ ○ ○ ◎ ○ Embodiment 5 39.8 30.0 18.1 21.7 59.4 9.8 61.0 11.9 58.2 ○ ○ ○ ◎ ◎ Embodiment 6 27.5 21.7 13.9 13.6 37.2 5.8 35.8 7.8 38.3 ◎ ◎ ◎ ◎ ○ Embodiment 7 33.0 24.3 14.8 18.2 49.9 8.6 53.6 9.6 47.0 ○ ○ ○ ◎ ◎ Embodiment 8 17.7 14.1 10.9 6.8 18.5 3.6 22.1 3.2 15.7 ◎ ◎ ◎ × × Comparison Example 1 58.7 45.6 26.1 32.6 89.4 13.1 81.7 19.5 95.4 × × × ◎ ◎ L _A L _B L _C ΔL _AC - ΔL _AB - ΔL _BC - No pigmented adhesive layer 64.4 48.3 27.9 36.5 - 16.1 - 20.4 -

From the above table, it can be seen that the colored adhesive sheet obtained by using the embodiment is excellent in style (especially seamless style). In addition, the colored adhesive sheet obtained by using embodiments 1 to 7 is also excellent in inspection. In addition, the colored adhesive sheet obtained by the embodiment is also excellent in step tracking. [Industrial Applicability]

The colored adhesive sheet of the present invention is suitable for bonding between display components of a display having a black frame material, for example, and in particular, bonding between a protective panel having a step difference and a desired display component.

1: Colored adhesive sheet 11: Colored adhesive layer 12a, 12b: Peeling sheet 2: Display body 21: 1st display body component 22: 2nd display body component 3: Printing layer 4: Frame material

FIG1 is a cross-sectional view of a colored adhesive sheet according to an embodiment of the present invention; FIG2 is a cross-sectional view of a display according to an embodiment of the present invention; and FIG3 is a top view of a display having a frame material according to an embodiment of the present invention.

1: Colored adhesive sheet

11: Colored adhesive layer

12a,12b: Peeling film

Claims (14)

A display body, comprising: a first display body component having at least two different brightness regions in a plane direction; a second display body component; and a colored adhesive layer formed by bonding the first display body component and the second display body component to each other and comprising an adhesive containing a colorant, wherein the adhesive is an acrylic adhesive and is based on the CIE1976 L*a*b* color system. It is stipulated that if the brightness L* of one area R1 of the first display component is set to L1, the brightness L* of another area R2 is set to L2, the brightness L* of the area R1 where the colored adhesive layer is deposited is set to L1', and the brightness L* of the area R2 where the colored adhesive layer is deposited is set to L2', the following formulas (I) to (IV) are satisfied: △L=L1-L2...(I) △L'=L1'-L2'...(II) △L>0...(III) (△L'/△L)×100≦80...(IV), the display is a liquid crystal display, a light-emitting diode display, or an organic electroluminescent display. A display body, comprising: a first display body component having at least two different brightness regions in a plane direction; a second display body component; and a colored adhesive layer formed by bonding the first display body component and the second display body component to each other and composed of an adhesive containing a colorant, wherein the adhesive is an acrylic adhesive, According to CIE1976L*a*b* colorimetric It is stipulated that if the brightness L* of one area R1 of the first display component is set to L1, the brightness L* of another area R2 is set to L2, the brightness L* of the area R1 where the colored adhesive layer is deposited is set to L1', and the brightness L* of the area R2 where the colored adhesive layer is deposited is set to L2', the following formulas (I) to (IV) are satisfied: △L=L1-L2...(I) △L'=L1'-L2'...(II) △L>0...(III) (△L'/△L)×100≦80...(IV), the display is electronic paper. A display body, comprising: a first display body component having at least two different brightness regions in a plane direction; a second display body component; and a colored adhesive layer formed by bonding the first display body component and the second display body component to each other and comprising an adhesive containing a colorant, wherein the adhesive is an acrylic adhesive and is based on the CIE1976 L*a*b* color system. It is stipulated that if the brightness L* of one area R1 of the first display component is set to L1, the brightness L* of another area R2 is set to L2, the brightness L* of the area R1 on which the colored adhesive layer is deposited is set to L1', and the brightness L* of the area R2 on which the colored adhesive layer is deposited is set to L2', the following formulas (I) to (IV) are satisfied: △L=L1-L2...(I) △L'=L1'-L2'...(II) △L>0...(III) (△L'/△L)×100≦80...(IV), the display is a touch panel. A display as described in any one of claims 1 to 3, wherein the display further satisfies the following formula (V): △L’≦30...(V). A display as described in any one of claims 1 to 3, wherein the brightness L* of the colored adhesive layer is greater than 5 and less than 95 according to the CIE1976 L*a*b* color system. A display as described in any one of claims 1 to 3, wherein the chromaticity a* and chromaticity b* of the colored adhesive layer are respectively -7 to 7 according to the CIE1976 L*a*b* color system. A display as described in any one of claims 1 to 3, wherein the total light transmittance of the colored adhesive layer is greater than 30%. A display as described in any one of claims 1 to 3, wherein the total light haze value of the colored adhesive layer is greater than 0.5% and less than 40%. A display as described in any one of claims 1 to 3, wherein the coloring agent is diluted 10,000 times with ethyl acetate, and the average haze value at a wavelength of 780nm and the average haze value at a wavelength of 380nm is greater than 1% and less than 60%. A display as described in any one of claims 1 to 3, wherein the difference between the haze value of the colorant diluted 10,000 times with ethyl acetate at a wavelength of 780nm and the haze value at a wavelength of 380nm is less than 30 points. A display as described in any one of claims 1 to 3, wherein the colorant is a black pigment. A display as described in any one of claims 1 to 3, wherein the adhesive is cross-linked by an adhesive composition containing: a (meth)acrylate polymer (A), a cross-linking agent (B), and a coloring agent (C). A display as described in any one of claims 1 to 3, wherein at least one of the first display component and the second display component has a step difference on at least one side of the side to be bonded by the colored adhesive layer. A display as described in any one of claims 1 to 3, wherein the display has a black frame material.

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