JP6906560B2 - Adhesive sheet and display - Google Patents

Description

The present invention relates to an adhesive sheet attached to an adherend having an uneven surface, and a display body using the adhesive sheet.

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

As described above, in a display body for in-vehicle use or the like, when the display body is turned off, it is required to give a sense of unity with peripheral members of the display body, for example, a frame material, and improve the design. Sometimes. For that purpose, it is conceivable to color the display body. As an example, Patent Document 1 discloses an invention in which a colored layer in which a colored dye is dispersed and contained in a pressure-sensitive adhesive is provided as a part of a layer constituting a display body.

Japanese Unexamined Patent Publication No. 2012-234028

In the invention described in Patent Document 1, the colored layer is provided so as to be in contact with a concealing layer formed in a plan view frame shape of a display body, that is, a step. However, in the display body having such a configuration, there is a problem that the colored layer has uneven transmittance, which causes uneven brightness in the display body.

The present invention has been made in view of the above-mentioned actual conditions, and an object of the present invention is to provide a pressure-sensitive adhesive sheet and a display body capable of suppressing uneven transmittance in the pressure-sensitive adhesive layer.

In order to achieve the above object, first, the present invention is a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer attached to an adherend having irregularities on the surface, wherein the pressure-sensitive adhesive layer is at least one layer of colored adhesive. It is a laminate of an agent layer and at least one colorless pressure-sensitive adhesive layer, and is characterized in that the colorless pressure-sensitive adhesive layer is located on a surface of the pressure-sensitive adhesive layer that comes into contact with the unevenness of the adherend. (Invention 1).

In the above invention (Invention 1), when the pressure-sensitive adhesive layer is brought into contact with the unevenness of the adherend to follow it, the layer in contact with the unevenness of the adherend is not a colored pressure-sensitive adhesive layer but a colorless pressure-sensitive adhesive layer. .. The unevenness of the adherend can be absorbed to some extent by the colorless adhesive layer. Therefore, it is possible to suppress the colored pressure-sensitive adhesive layer from being compressed or deformed due to the unevenness of the adherend, and thus it is possible to suppress the unevenness of the transmittance in the pressure-sensitive adhesive layer.

In the above invention (Invention 1), it is preferable that the thickness of the colorless pressure-sensitive adhesive layer located on the surface in contact with the unevenness of the adherend is larger than the depth or height of the unevenness of the adherend (invention 1). Invention 2).

In the above inventions (Inventions 1 and 2), it is preferable that the pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer for adhering one display body component and another display body component (Invention 3). ..

In the above inventions (Inventions 1 to 3), the storage elastic modulus of the pressure-sensitive adhesive constituting the colorless pressure-sensitive adhesive layer at 23 ° C. is preferably 0.01 MPa or more and 1 MPa or less (Invention 4).

In the above inventions (Inventions 1 to 4), the storage elastic modulus of the pressure-sensitive adhesive constituting the colored pressure-sensitive adhesive layer at 23 ° C. is preferably 0.01 MPa or more and 1 MPa or less (Invention 5).

In the above inventions (Inventions 1 to 5), it is preferable to provide two release sheets and the pressure-sensitive adhesive layer sandwiched between the release sheets so as to be in contact with the release surfaces of the two release sheets (invention). 6).

Secondly, the present invention includes one display body component, another display body component, and an adhesive layer for adhering the one display body component and the other display body components to each other. In the display body, at least one of the display body constituent member and the other display body constituent member has irregularities on the surface on the side to be bonded by the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer. Provided a display body characterized by being the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet (Invention 1 to 6) (Invention 7).

Thirdly, the present invention includes one display body component, another display body component, and an adhesive layer for bonding the one display body component and the other display body components to each other. In the display body, at least one of the display body constituent member and the other display body constituent member has irregularities on the surface on the side to be bonded by the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer. However, the display body is provided with at least one colored pressure-sensitive adhesive layer, and the ratio of the light beam transmittance in the vicinity of the uneven portion to the light beam transmittance in the flat portion is 0.980 or more. Provided (Invention 8).

In the above inventions (Inventions 7 and 8), the unevenness may be unevenness due to a printing layer provided on a part of the display body in a plan view (Invention 9).

In the above inventions (Inventions 7 and 8), the unevenness may be unevenness due to a plurality of light emitters provided on the substrate (Invention 10).

According to the pressure-sensitive adhesive sheet and the display body according to the present invention, unevenness in transmittance in the pressure-sensitive adhesive layer can be suppressed.

It is sectional drawing of the pressure-sensitive adhesive sheet which concerns on one Embodiment of this invention. It is sectional drawing of the display body which concerns on one Embodiment of this invention. It is sectional drawing of the display body which concerns on other embodiment of this invention. It is sectional drawing of the adhesive sheet which concerns on other embodiment of this invention. It is a top view of the adherend used in the test example (measurement of luminous flux transmittance). It is sectional drawing which shows the sample prepared in the test example (measurement of luminous flux transmittance).

Hereinafter, embodiments of the present invention will be described.
[Adhesive sheet]
The pressure-sensitive adhesive sheet according to an embodiment of the present invention is a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer to be attached to an adherend having irregularities on the surface. The pressure-sensitive adhesive layer is a laminate of at least one colored pressure-sensitive adhesive layer and at least one colorless pressure-sensitive adhesive layer, and the colorless pressure-sensitive adhesive is applied to a surface of the pressure-sensitive adhesive layer that comes into contact with irregularities of an adherend. The agent layer is located.

Here, when the colored pressure-sensitive adhesive layer is brought into contact with the unevenness of the adherend and followed as in the conventional case, the colored pressure-sensitive adhesive layer may be compressed or deformed due to the unevenness of the adherend. do. As a result, the color of the colored pressure-sensitive adhesive layer is shaded, and the transmittance becomes uneven. For example, in the portion where the colored pressure-sensitive adhesive layer is compressed, the color becomes darker and the transmittance decreases. On the other hand, the pressure-sensitive adhesive sheet according to the present embodiment has the above-mentioned structure, so that the layer in contact with the unevenness of the adherend is not a colored pressure-sensitive adhesive layer but a colorless pressure-sensitive adhesive layer. Therefore, it is possible to prevent the colored pressure-sensitive adhesive layer from being compressed or deformed due to the unevenness of the adherend. Thereby, unevenness of the transmittance in the pressure-sensitive adhesive layer can be suppressed.

In the pressure-sensitive adhesive sheet according to the present embodiment, the thickness of the colorless pressure-sensitive adhesive layer located on the surface of the adherend in contact with the unevenness is preferably larger than the depth or height of the unevenness of the adherend. As a result, the unevenness of the adherend can be absorbed by the colorless pressure-sensitive adhesive layer, and the colored pressure-sensitive adhesive layer is more effectively suppressed from being compressed or deformed by the unevenness. Therefore, the unevenness of the transmittance in the pressure-sensitive adhesive layer is suppressed more effectively.

The pressure-sensitive adhesive layer is preferably a pressure-sensitive adhesive layer for adhering one display body component and another display body component. The display body and the display body constituent members will be described later. In the display body obtained by using the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet according to the present embodiment, unevenness in transmittance in the pressure-sensitive adhesive layer is suppressed, so that uneven brightness is suppressed in the display body. However, the adhesive sheet according to the present embodiment is not limited to the use for the display body.

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

The pressure-sensitive adhesive layer 11 in this embodiment is a laminate of one layer of colored pressure-sensitive adhesive layer 111 and one layer of colorless pressure-sensitive adhesive layer 112. However, the present invention is not limited to this, and the colored pressure-sensitive adhesive layer 111 and the colorless pressure-sensitive adhesive layer 112 may each have a plurality of layers. The colorless pressure-sensitive adhesive layer 112 is located on the surface of the pressure-sensitive adhesive layer 11 that comes into contact with the unevenness of the adherend.

1. 1. Each member 1-1. Adhesive Layer The Colored Adhesive Layer 111 is preferably composed of a pressure-sensitive adhesive containing a colorant. On the other hand, the colorless pressure-sensitive adhesive layer 112 is preferably composed of a pressure-sensitive adhesive containing no colorant, and is preferably colorless and transparent. In addition, "does not contain a colorant" means "substantially does not contain a colorant", does not contain a colorant at all, and contains a colorant in an amount that does not impair the effect in the present embodiment. Cases are also included. The amount is preferably 0.1% by mass or less, particularly preferably 0.01% by mass or less, further preferably 0.001% by mass or less, and preferably 0% by mass. Most preferred.

The type of the pressure-sensitive adhesive constituting the colored pressure-sensitive adhesive layer 111 and the colorless pressure-sensitive adhesive layer 112 of the pressure-sensitive adhesive sheet 1 according to the present embodiment is not particularly limited, and for example, an acrylic pressure-sensitive adhesive, a polyester-based pressure-sensitive adhesive, and a polyurethane-based pressure-sensitive adhesive. , Rubber-based pressure-sensitive adhesive, silicone-based pressure-sensitive adhesive, or the like. Further, the pressure-sensitive adhesive may be an emulsion type, a solvent type or a solvent-free type, and may be either a crosslinked type or a non-crosslinked type. Among them, an acrylic pressure-sensitive adhesive having excellent adhesive physical properties, optical properties, and the like is preferable.

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

The pressure-sensitive adhesive constituting the colored pressure-sensitive adhesive layer 111 and the pressure-sensitive adhesive constituting the colorless pressure-sensitive adhesive layer 112 may be of the same type or different types. For example, one may be an active energy ray-curable acrylic pressure-sensitive adhesive, and the other may be an active energy ray non-curable acrylic pressure-sensitive adhesive. Further, even when both are common to the active energy ray-curable acrylic pressure-sensitive adhesive or the active energy ray-non-curable acrylic pressure-sensitive adhesive, the composition of the pressure-sensitive adhesive and the monomer composition of the main polymer are different. May be.

Specifically, the pressure-sensitive adhesive constituting the colored pressure-sensitive adhesive layer 111 and the pressure-sensitive adhesive constituting the colorless pressure-sensitive adhesive layer 112 contain a (meth) acrylic acid ester polymer (A) and a cross-linking agent (B). It is preferably formed by cross-linking an adhesive composition (hereinafter, may be referred to as "adhesive composition P"). In the case of the colored pressure-sensitive adhesive layer 111, the pressure-sensitive adhesive composition P preferably further contains the colorant (C). When the pressure-sensitive adhesive is an active energy ray-curable pressure-sensitive adhesive, the pressure-sensitive adhesive composition P preferably further contains an active energy ray-curable component (D).

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

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

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

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

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

Examples of the amino group-containing monomer include aminoethyl (meth) acrylate and n-butylaminoethyl (meth) acrylate. These may be used alone or in combination of two or more. The nitrogen atom-containing monomer described later is excluded from this amino group-containing monomer.

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

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

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

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

The (meth) acrylic acid ester polymer (A) preferably contains (meth) acrylic acid alkyl ester in an amount of 45% by mass or more, and particularly 55% by mass or more, as a monomer unit constituting the polymer. It is preferable, and it is preferable that the content is 65% by mass or more. When the lower limit of the content of the (meth) acrylic acid alkyl ester is as described above, the (meth) acrylic acid ester polymer (A) can exhibit suitable tackiness. Further, when the colorant (C) is contained, the dispersibility of the colorant (C) in the pressure-sensitive adhesive tends to be good, and the (meth) acrylic acid ester polymer (A) has a desired stickiness. The loss is suppressed. As a result, the obtained pressure-sensitive adhesive can exhibit suitable stickiness, and the reproducibility and uniformity of the optical physical properties are good, and the light flux transmittance, which will be described later, can be easily controlled to a desired value. On the other hand, the (meth) acrylic acid ester polymer (A) preferably contains (meth) acrylic acid alkyl ester in an amount of 99% by mass or less, and 95% by mass or less, as a monomer unit constituting the polymer. Is more preferable, and it is particularly preferable to contain 90% by mass or less, and further preferably 85% by mass or less. When the upper limit of the content of the (meth) acrylic acid alkyl ester is as described above, a suitable amount of another monomer component such as a reactive functional group-containing monomer is introduced into the (meth) acrylic acid ester polymer (A). be able to.

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

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

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

When the (meth) acrylic acid ester polymer (A) contains an alicyclic structure-containing monomer as a monomer unit constituting the polymer, it preferably contains 1% by mass or more of the alicyclic structure-containing monomer. In particular, it is preferably contained in an amount of 4% by mass or more, and more preferably 8% by mass or more. Further, the (meth) acrylic acid ester polymer (A) preferably contains 30% by mass or less of an alicyclic structure-containing monomer, and particularly 20% by mass or less, as a monomer unit constituting the polymer. It is preferable that the content is 10% by mass or less. When the content of the alicyclic structure-containing monomer is in the above range, the unevenness-following property of the obtained adhesive is more excellent.

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

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

When the (meth) acrylic acid ester polymer (A) contains a nitrogen atom-containing monomer as a monomer unit constituting the polymer, the nitrogen atom-containing monomer is preferably contained in an amount of 1% by mass or more, particularly 2% by mass. It is preferably contained in an amount of% or more, and more preferably 4% by mass or more. Further, the (meth) acrylic acid ester polymer (A) preferably contains the nitrogen atom-containing monomer in an amount of 24% by mass or less, particularly 16% by mass or less, as a monomer unit constituting the polymer. It is preferable, and it is preferable that the content is 8% by mass or less. When the content of the nitrogen atom-containing monomer is within the above range, the obtained pressure-sensitive adhesive can sufficiently exert excellent adhesive strength to glass.

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

The (meth) acrylic acid ester polymer (A) is preferably a linear polymer. Since it is a linear polymer, entanglement of molecular chains is likely to occur, and improvement in cohesive force can be expected. Therefore, an adhesive having excellent unevenness followability and blister resistance under high temperature and high humidity conditions can be obtained. easy.

Further, the (meth) acrylic acid ester polymer (A) is preferably a solution polymer obtained by a solution polymerization method. Since it is a solution polymer, it is easy to obtain a high molecular weight polymer, and it is expected that the cohesive force is improved. Therefore, it is easy to obtain an adhesive having excellent unevenness followability and blister resistance under high temperature and high humidity conditions. ..

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

The weight average molecular weight of the (meth) acrylic acid ester polymer (A) is preferably 200,000 or more, more preferably 300,000 or more, particularly preferably 400,000 or more, and coloring. From the viewpoint of the dispersibility of the agent (C), it is more preferably 500,000 or more. When the lower limit of the weight average molecular weight of the (meth) acrylic acid ester polymer (A) is the above, the values such as the gel fraction and the storage elastic modulus of the obtained adhesive tend to be suitable, and the temperature and humidity conditions are high. The unevenness followability and blister resistance underneath will be better. Further, the dispersibility of the colorant (C) in the pressure-sensitive adhesive tends to be good, and therefore, the obtained pressure-sensitive adhesive has good reproducibility and uniformity of optical physical properties, and has a luminous flux transmittance described later. Can be easily controlled to a desired value.

The weight average molecular weight of the (meth) acrylic acid ester polymer (A) is preferably 1.5 million or less, more preferably 1.2 million or less, and particularly preferably 1 million or less, as an upper limit value. Further, it is preferably 800,000 or less. When the upper limit of the weight average molecular weight of the (meth) acrylic acid ester polymer (A) is as described above, the values such as the gel fraction and the storage elastic modulus of the obtained adhesive tend to be suitable, and the initial unevenness can be followed. The sex will be better. The weight average molecular weight in the present specification is a standard polystyrene-equivalent value measured by a gel permeation chromatography (GPC) method.

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

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

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

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

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

The content of the cross-linking agent (B) in the adhesive composition P is preferably 0.01 part by mass or more with respect to 100 parts by mass of the (meth) acrylic acid ester polymer (A), and in particular, 0. It is preferably 05 parts by mass or more, and more preferably 0.1 parts by mass or more. The content is preferably 10 parts by mass or less, more preferably 5 parts by mass or less, particularly preferably 1 part by mass or less, and further preferably 0.4 parts by mass or less. Is preferable, and 0.2 parts by mass or less is most preferable. When the content of the cross-linking agent (B) is within the above range, the gel fraction, storage elastic modulus, adhesive strength, etc. of the obtained adhesive are likely to be suitable, and the unevenness followability under high temperature and high humidity conditions and It is superior in blister resistance.

(1-3) Colorant (C)
The colorant (C) may be a pigment or a dye. The pigment may be an inorganic pigment or an organic pigment. From the viewpoint of the durability of the obtained pressure-sensitive adhesive, inorganic pigments are preferable. The color of the colorant can be appropriately selected depending on the intended purpose. For example, if you want to create a sense of unity with the peripheral member, you can select it according to the color of the peripheral member, and in general, it should be a dark or dark color such as black, brown, navy blue, purple, or blue. Is preferable, and black color is particularly preferable.

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

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

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

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

Among the above-mentioned colorants, carbon black pigments, niglosin black dyes, and chromate black dyes are preferable from the viewpoint of easily producing a sense of unity with peripheral members. The surface of the carbon black may or may not be subjected to a predetermined treatment (for example, a solvent-containing treatment).

In the above colorant, the lower limit of the average haze, which is the average value of the haze value at a wavelength of 780 nm and the haze value at a wavelength of 380 nm, of a solution obtained by diluting the colorant 10,000 times with ethyl acetate is 1% or more. Those having an amount of 2% or more are preferable, and those having an amount of 3% or more are preferable. Further, the colorant preferably has an upper limit of the average haze of 60% or less, preferably 40% or less, particularly preferably 30% or less, and further preferably 20% or less. The one is preferable, and the one with 10% or less is most preferable. By using such a colorant in an appropriate amount, the optical physical properties of the obtained colored pressure-sensitive adhesive layer 111 become suitable, and therefore, the optical physical properties of the obtained pressure-sensitive adhesive layer 11 tend to be suitable.

Further, the colorant preferably has a difference value between the haze value at a wavelength of 780 nm and the haze value at a wavelength of 380 nm of a solution obtained by diluting the colorant 10,000 times with ethyl acetate at 30 points or less. Those having 25 points or less are more preferable, those having 20 points or less are preferable, those having 16 points or less are preferable, and those having 10 points or less are most preferable. By using such a colorant in an appropriate amount, the optical physical properties of the obtained colored pressure-sensitive adhesive layer 111 become suitable, and therefore, the optical physical properties of the obtained pressure-sensitive adhesive layer 11 tend to be suitable.

The lower limit of the difference between the haze values may be 0 points, but is 0.1 points or more from the viewpoint of facilitating the adjustment of the optical properties of the colored pressure-sensitive adhesive layer 111 to a suitable one. It is preferably 0.5 points or more, more preferably 1 point or more, and further preferably 3 points or more.

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

Further, the standard haze value of the solution obtained by diluting the colorant 10,000 times with ethyl acetate at each wavelength of 5 nm pitch in the wavelength region of 380 nm to 780 nm (that is, 380 nm, 385 nm, 390 nm, ..., 775 nm, 780 nm). The deviation is preferably 10 or less, more preferably 8 or less, particularly preferably 5 or less, and further preferably 2 or less. The lower limit of the standard deviation is most preferably 0, but usually 0.1 or more, particularly preferably 0.5 or more, and further preferably 1 or more. .. As a result, the optical physical properties of the obtained colored pressure-sensitive adhesive layer 111 become suitable, and therefore, the optical physical properties of the obtained pressure-sensitive adhesive layer 11 tend to be suitable.

In the colored pressure-sensitive adhesive layer 111, the content of the colorant (C) with respect to 100 parts by mass of the (meth) acrylic acid ester polymer (A) makes it easier to control the total light transmittance to a desired value, and the display body. From the viewpoint of facilitating excellent concealment when the light is turned off, it is preferably 0.01 part by mass or more, more preferably 0.05 part by mass or more, and particularly 0.1 part by mass or more. It is preferably 0.3 parts by mass or more, and more preferably 0.4 parts by mass or more. Further, the content is 8 parts by mass or less from the viewpoint that the haze can be easily controlled to a desired value and excellent visibility (easiness of viewing images / videos) can be easily exhibited when the display body is lit. It is preferably 4 parts by mass or less, particularly preferably 2 parts by mass or less, and further preferably 1 part by mass or less. When the content of the colorant (C) is in the above range, the colorant can be sufficiently colored without deteriorating the durability of the obtained pressure-sensitive adhesive, and desired hiding power and visibility can be exhibited. The term "concealment" as used herein means that when the display body is turned off, the appearance of the display unit on the display body and peripheral members such as a frame-shaped printing layer and a frame material are in harmony, and the boundary between them is defined. It means that it becomes difficult to see.

(1-4) Active energy ray-curable component (D)
When the pressure-sensitive adhesive constituting the colored pressure-sensitive adhesive layer 111 or the colorless pressure-sensitive adhesive layer 112 is an active energy ray-curable pressure-sensitive adhesive, the pressure-sensitive adhesive composition P contains the active energy ray-curable component (D). Is preferable. In a pressure-sensitive adhesive obtained by cross-linking the pressure-sensitive adhesive composition P with active energy ray-curable, the active energy ray-curable components (D) are polymerized with each other, and the polymerized active energy ray-curable component (D) is produced. It is presumed that the (meth) acrylic acid ester polymer (A) is entangled in the crosslinked structure (three-dimensional network structure). The pressure-sensitive adhesive having such a high-order structure exhibits extremely excellent durability, and is particularly excellent in unevenness followability and blister resistance under high temperature and high humidity conditions.

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

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

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

The content of the active energy ray-curable component (D) in the adhesive composition P is set to a high temperature and high humidity condition, with values such as the gel fraction and the storage elastic modulus of the pressure-sensitive adhesive after the active energy ray curing being suitable. From the viewpoint of improving the unevenness followability and blister resistance underneath, it is preferable that the lower limit is 1 part by mass or more with respect to 100 parts by mass of the (meth) acrylic acid ester polymer (A). It is particularly preferably 3 parts by mass or more, and further preferably 4 parts by mass or more. On the other hand, the content is preferably 20 parts by mass or less, particularly preferably 12 parts by mass or less, and 8 parts by mass or less as an upper limit value from the viewpoint of the adhesive strength of the pressure-sensitive adhesive after the active energy ray curing. Is more preferable.

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

Examples of such a photopolymerization initiator (E) include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, and 2,2-dimethoxy. -2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexylphenylketone, 2-methyl-1- [4- (Methylthio) phenyl] -2-morpholino-propan-1-one, 4- (2-hydroxyethoxy) phenyl-2- (hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4'-diethylamino Benzophenone, Dichlorobenzophenone, 2-Methylanthraquinone, 2-Ethylanthraquinone, 2-Turrary-butylanthraquinone, 2-Aminoanthraquinone, 2-Methylthioxanthone, 2-Ethylthioxanthone, 2-Chlorothioxanthone, 2,4-dimethylthioxanthone, 2 , 4-Diethylthioxanthone, benzyl dimethyl ketal, acetophenone dimethyl ketal, p-dimethylaminobenzoic acid ester, oligo [2-hydroxy-2-methyl-1 [4- (1-methylvinyl) phenyl] propanone], 2,4 , 6-trimethylbenzoyl-diphenyl-phosphine oxide, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide and the like. These may be used alone or in combination of two or more.

Among the above, a phosphine oxide-based photopolymerization initiator that easily cleaves and reliably cures the pressure-sensitive adhesive even when ultraviolet rays are irradiated through a plastic plate containing an ultraviolet absorber is preferable. Specifically, 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide and the like are preferable.

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

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 0.1 or more, and particularly 0. It is preferably 3 or more, and more preferably 0.6 or more. The mass ratio is preferably 10 or less, more preferably 5 or less, particularly preferably 2 or less, and further preferably 1 or less. Since the ratio of the amount of the photopolymerization initiator (E) to the amount of the colorant (D) is in the above range, it is more suitable for active energy ray curing while controlling the total light transmittance and the haze value within a preferable range. A pressure-sensitive adhesive having a gel fraction, a storage elastic modulus and an adhesive strength can be easily obtained, and the uneven followability and blister resistance under high temperature and high humidity conditions tend to be excellent.

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

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

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

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

The content of the silane coupling agent in the adhesive composition P is preferably 0.01 part by mass or more, particularly 0.05 parts by mass, based on 100 parts by mass of the (meth) acrylic acid ester polymer (A). It is preferably parts by mass or more, and more preferably 0.1 parts by mass or more. The content is preferably 1.2 parts by mass or less, particularly preferably 0.8 parts by mass or less, and further preferably 0.4 parts by mass or less.

(2) Preparation of Adhesive Composition The adhesive composition P produced a (meth) acrylic acid ester polymer (A), and the obtained (meth) acrylic acid ester polymer (A) and a cross-linking agent ( It can be produced by mixing with B) and, if desired, adding an active energy ray-curable component (D), a photopolymerization initiator (E), an additive and the like. In the case of the colored pressure-sensitive adhesive layer 111, the colorant (C) is further blended.

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

Examples of the polymerization initiator include azo compounds and organic peroxides, and two or more of them may be used in combination. Examples of the azo compound include 2,2'-azobisisobutyronitrile, 2,2'-azobis (2-methylbutyronitrile), 1,1'-azobis (cyclohexane1-carbonitrile), and 2, , 2'-azobis (2,4-dimethylvaleronitrile), 2,2'-azobis (2,4-dimethyl-4-methoxyvaleronitrile), dimethyl 2,2'-azobis (2-methylpropionate) 4,4'-azobis (4-cyanovaleric acid), 2,2'-azobis (2-hydroxymethylpropionitrile), 2,2'-azobis [2- (2-imidazolin-2-yl)) Propane] and the like.

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

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

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

Examples of the diluting solvent include aliphatic hydrocarbons such as hexane, heptane and cyclohexane, aromatic hydrocarbons such as toluene and xylene, halogenated hydrocarbons such as methylene chloride and ethylene chloride, methanol, ethanol, propanol and butanol. Alcohols such as 1-methoxy-2-propanol, ketones such as acetone, methyl ethyl ketone, 2-pentanone, isophorone and cyclohexanone, esters such as ethyl acetate and butyl acetate, and cellosolve solvents such as ethyl cellosolve are used.

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

(3) Formation of Adhesive Layer The colored pressure-sensitive adhesive layer 111 and the colorless pressure-sensitive adhesive layer 112 in the present embodiment are preferably made of a pressure-sensitive adhesive obtained by cross-linking the pressure-sensitive adhesive composition P (coating layer). Crosslinking of the adhesive composition P can usually be carried out by heat treatment. In addition, this heat treatment can also serve as a drying treatment when volatilizing the diluting solvent or the like from the coating layer of the adhesive composition P applied to the desired object.

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

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

By the above heat treatment (and curing), the (meth) acrylic acid ester polymer (A) is sufficiently crosslinked via the crosslinking agent (B).

The pressure-sensitive adhesive layer 11 in the present embodiment can be obtained by laminating the colored pressure-sensitive adhesive layer 111 and the colorless pressure-sensitive adhesive layer 112. The timing of laminating may be before or after curing each pressure-sensitive adhesive layer. However, in order to further improve the adhesiveness of the colored pressure-sensitive adhesive layer 111 and the colorless pressure-sensitive adhesive layer 112, it is preferable to laminate each pressure-sensitive adhesive layer before curing.

(4) Physical Characteristics of Adhesive The adhesive in the present embodiment preferably has the following physical characteristics.
(4-1) Gel fraction The gel fraction of each of the colored pressure-sensitive adhesive layer 111 and the colorless pressure-sensitive adhesive layer 112 is preferably 20% or more, preferably 40% or more, as a lower limit value. More preferably, it is particularly preferably 50% or more, and even more preferably 52% or more. The gel fraction is preferably 100% or less, more preferably 80% or less, particularly preferably 70% or less, and further preferably 60% or less as the upper limit value. , 55% or less is most preferable. When the gel fraction of the pressure-sensitive adhesive is in the above range, the pressure-sensitive adhesive exhibits good cohesive force, and both uneven followability and blister resistance under high temperature and high humidity conditions are excellent. .. In addition, good adhesive strength is exhibited, and the adhesiveness with the adherend becomes more excellent. Here, the method for measuring the gel fraction of the pressure-sensitive adhesive is as shown in a test example described later.

In the case of an active energy ray-curable pressure-sensitive adhesive, the gel fraction of the pressure-sensitive adhesive after active energy ray-curing is preferably 40% or more, more preferably 50% or more, and particularly 60%. The above is preferable, and more preferably 65% or more. The gel fraction is preferably 100% or less, more preferably 90% or less, particularly preferably 80% or less, and further preferably 75% or less as the upper limit value. , 71% or less is most preferable. When the gel fraction of the pressure-sensitive adhesive after the active energy ray curing is in the above range, the unevenness-following property and the blister resistance under high temperature and high humidity conditions become more excellent. In addition, good adhesive strength is exhibited, and the adhesiveness with the adherend becomes more excellent.

(4-2) Storage Elastic Modulus The storage elastic modulus of the pressure-sensitive adhesive constituting the colored pressure-sensitive adhesive layer 111 at 23 ° C. is preferably 0.01 MPa or more, preferably 0.02 MPa or more as a lower limit value. In particular, it is preferably 0.04 MPa or more, and more preferably 0.06 MPa or more. When the lower limit value of the storage elastic modulus is the above, the blister resistance is excellent. Further, when the colorless pressure-sensitive adhesive layer 112 of the pressure-sensitive adhesive sheet 11 according to the present embodiment is brought into contact with and followed by the unevenness of the adherend, it is compressed or deformed due to the unevenness of the adherend. Due to this, the colored pressure-sensitive adhesive layer 111 may be affected by the compression or deformation of the colorless pressure-sensitive adhesive layer 112 (that is, uneven transmittance occurs), but the lower limit of the storage elastic modulus is set. As a result, the colored pressure-sensitive adhesive layer 111 is less likely to be affected by the compression and deformation of the colorless pressure-sensitive adhesive layer 112, and the light beam transmittance, which will be described later, can be easily controlled to a desired value. As a result, the effect of suppressing unevenness in transmittance becomes more excellent.

The upper limit of the storage elastic modulus is preferably 1 MPa or less, more preferably 0.5 MPa or less, particularly preferably 0.2 MPa or less, and further preferably 0.1 MPa or less. .. When the upper limit value of the storage elastic modulus is the above, good adhesive strength is exhibited, and the adhesiveness to the adherend becomes more excellent.

On the other hand, the storage elastic modulus of the pressure-sensitive adhesive constituting the colorless pressure-sensitive adhesive layer 112 at 23 ° C. is preferably 0.01 MPa or more, particularly preferably 0.02 MPa or more, and further 0.04 MPa as the lower limit value. The above is preferable. When the lower limit value of the storage elastic modulus is the above, the uneven followability and the blister resistance under high temperature and high humidity conditions are excellent.

The upper limit of the storage elastic modulus is preferably 1 MPa or less, more preferably 0.5 MPa or less, particularly preferably 0.2 MPa or less, and further preferably 0.1 MPa or less. , 0.05 MPa or less is most preferable. When the upper limit value of the storage elastic modulus is the above, the initial unevenness followability is excellent. Further, the unevenness of the adherend can be absorbed by the colorless pressure-sensitive adhesive layer 112, and the colored pressure-sensitive adhesive layer 111 is more effectively suppressed from being compressed or deformed by the unevenness. As a result, the luminous flux transmittance and the like, which will be described later, can be controlled to a desired value. Therefore, the unevenness of the transmittance in the pressure-sensitive adhesive layer 11 is more effectively suppressed.

When the pressure-sensitive adhesive constituting the colored pressure-sensitive adhesive layer 111 is an active energy ray-curable pressure-sensitive adhesive, the storage elastic modulus of the pressure-sensitive adhesive after active energy ray-curing at 23 ° C. is 0.05 MPa or more as a lower limit. It is preferably 0.09 MPa or more, particularly preferably 0.12 MPa or more, and further preferably 0.15 MPa or more. When the lower limit value of the storage elastic modulus is the above, the blister resistance is excellent. The upper limit of the storage elastic modulus is preferably 2 MPa or less, more preferably 1 MPa or less, particularly preferably 0.5 MPa or less, and further preferably 0.2 MPa or less. .. When the upper limit value of the storage elastic modulus is the above, good adhesive strength is exhibited, and the adhesiveness to the adherend becomes more excellent.

On the other hand, when the pressure-sensitive adhesive constituting the colorless pressure-sensitive adhesive layer 112 is an active energy ray-curable pressure-sensitive adhesive, the storage elastic modulus of the pressure-sensitive adhesive after active energy ray-curing at 23 ° C. is 0.05 MPa or more as a lower limit. It is preferably 0.08 MPa or more, and more preferably 0.12 MPa or more. When the lower limit value of the storage elastic modulus is the above, the uneven followability and the blister resistance under high temperature and high humidity conditions are excellent. The upper limit of the storage elastic modulus is preferably 2 MPa or less, more preferably 1 MPa or less, particularly preferably 0.5 MPa or less, and further preferably 0.2 MPa or less. .. When the upper limit value of the storage elastic modulus is the above, good adhesive strength is exhibited, and the adhesiveness to the adherend becomes more excellent.

When the storage elastic modulus of the pressure-sensitive adhesive constituting the colored pressure-sensitive adhesive layer 111 at 23 ° C. is G1 and the storage elastic modulus of the pressure-sensitive adhesive constituting the colorless pressure-sensitive adhesive layer 112 at 23 ° C. is G2, G1 and G2 are as follows. It is preferable to satisfy the relational expression.
G1 ≧ G2
By satisfying the above relational expression, when the colorless pressure-sensitive adhesive layer 112 of the pressure-sensitive adhesive sheet 11 according to the present embodiment is brought into contact with the unevenness of the adherend and followed, the colorless adhesive is adhered due to the unevenness of the adherend. The effect of compressing or deforming the agent layer 112 is less likely to be exerted on the colored pressure-sensitive adhesive layer 111, the luminous flux transmittance described later can be easily controlled to a desired value, and the effect of suppressing uneven transmittance is more excellent. It becomes a thing. From this point of view, it is more preferable that G1 and G2 satisfy the following relational expression.
G1> G2

The storage elastic modulus in the present specification is a value measured by the torsional shear method at a measurement frequency of 1 Hz in accordance with JIS K7244-6. Specifically, it is as shown in the test example described later.

(5) Thickness of Adhesive Layer The thickness of the colored adhesive layer 111 may be a thickness that can obtain desired optical characteristics (including the degree of coloring), but is usually 5 μm or more as a lower limit. It is preferably 20 μm or more, particularly preferably 40 μm or more, and further preferably 50 μm or more. When the lower limit of the thickness of the colored pressure-sensitive adhesive layer 111 is the above, it is easy to obtain desired optical physical properties and to exert desired adhesive strength in relation to the content of the colorant (C).

The thickness of the colored pressure-sensitive adhesive layer 111 is preferably 200 μm or less, more preferably 150 μm or less, particularly preferably 100 μm or less, and further preferably 75 μm or less as an upper limit value. .. When the upper limit of the thickness of the colored pressure-sensitive adhesive layer 111 is the above, the thickness of the pressure-sensitive adhesive layer 11 tends to be suitable. Further, it becomes easy to obtain desired optical physical characteristics in relation to the content of the colorant (C) and the like. The colored pressure-sensitive adhesive layer 111 may be formed as a single layer, or may be formed by laminating a plurality of layers.

On the other hand, the thickness of the colorless pressure-sensitive adhesive layer 112 (the colorless pressure-sensitive adhesive layer located on the surface of the adherend in contact with the unevenness) is preferably larger than the depth or height of the unevenness of the adherend, as described above. .. Usually, the lower limit is preferably 10 μm or more, more preferably 30 μm or more, particularly preferably 40 μm or more, and further preferably 50 μm or more. When the lower limit of the thickness of the colorless pressure-sensitive adhesive layer 112 is the above, the unevenness of the adherend can be absorbed by the colorless pressure-sensitive adhesive layer 112, and the colored pressure-sensitive adhesive layer 111 may be compressed or deformed by the unevenness. Is more effectively suppressed. This makes it easier to control the luminous flux transmittance and the like, which will be described later, to a desired value. Therefore, the unevenness of the transmittance in the pressure-sensitive adhesive layer 11 is more effectively suppressed.

The thickness of the colorless pressure-sensitive adhesive layer 112 is preferably 300 μm or less, more preferably 200 μm or less, particularly preferably 100 μm or less, and further preferably 75 μm or less as an upper limit value. .. When the upper limit of the thickness of the colorless pressure-sensitive adhesive layer 112 is the above, the thickness of the pressure-sensitive adhesive layer 11 tends to be suitable. The colorless pressure-sensitive adhesive layer 112 may be formed as a single layer, or may be formed by laminating a plurality of layers.

Here, the thickness of the colorless pressure-sensitive adhesive layer that is not located on the surface of the adherend that comes into contact with the unevenness is not limited to the above range, and can be set to a desired thickness.

The thickness of the pressure-sensitive adhesive layer 11 can be appropriately set according to the intended use, but usually, the lower limit value is preferably 50 μm or more, more preferably 80 μm or more, and particularly 100 μm or more. It is preferably 150 μm or more. When the lower limit of the thickness of the pressure-sensitive adhesive layer 11 is the above, it becomes easy to obtain a desired adhesive strength and excellent unevenness followability.

The thickness of the pressure-sensitive adhesive layer 11 is preferably 500 μm or less, more preferably 300 μm or less, particularly preferably 250 μm or less, and further preferably 200 μm or less as an upper limit value. When the upper limit of the thickness of the pressure-sensitive adhesive layer 11 is the above, the workability is good, and appearance defects due to imprints and the like are less likely to occur.

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

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

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

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

2. Physical Properties (1) Total Light Transmittance The total light transmittance of the colored pressure-sensitive adhesive layer 111 (measured in accordance with JIS K7361-1: 1997; the same shall apply hereinafter) is preferably 3% or more as the lower limit. It is preferably 10% or more, particularly preferably 30% or more, and further preferably 45% or more. When the total light transmittance of the colored pressure-sensitive adhesive layer 111 is as described above, the visibility as a display body can be easily ensured. On the other hand, the upper limit of the total light transmittance of the colored pressure-sensitive adhesive layer 111 is not particularly limited, but is usually 100% or less, preferably 90% or less, and 80% or less in consideration of concealment. Is more preferable, and particularly preferably 70% or less, and further preferably 60% or less.

The total light transmittance of the colorless pressure-sensitive adhesive layer 112 is preferably 80% or more, more preferably 90% or more, particularly preferably 95% or more, and further preferably 99% or more. preferable. When the total light transmittance of the colorless pressure-sensitive adhesive layer 112 is as described above, the transparency is high, and the pressure-sensitive adhesive layer 11 is suitable for optical applications (for displays). Further, when the colorless pressure-sensitive adhesive layer 112 is compressed or deformed due to the unevenness of the adherend, high transparency is easily maintained even in the vicinity of the unevenness, and the light flux transmittance described later is desired as the pressure-sensitive adhesive layer 11. It becomes easy to control the value of, and it becomes excellent due to the effect of suppressing the unevenness of the transmittance. The upper limit of the total light transmittance of the colorless pressure-sensitive adhesive layer 112 is not particularly limited, but is usually 100% or less.

The total light transmittance of the pressure-sensitive adhesive layer 11 is preferably 3% or more as a lower limit value, more preferably 10% or more, particularly preferably 30% or more, and further preferably 40% or more. Is preferable. When the total light transmittance of the pressure-sensitive adhesive layer 11 is as described above, the visibility as a display body is improved. On the other hand, the upper limit of the total light transmittance of the pressure-sensitive adhesive layer 11 is not particularly limited, but is usually 100% or less, preferably 90% or less, preferably 75% or less, from the viewpoint of improving the hiding property. It is more preferably 65% or less, and further preferably 55% or less.

When the pressure-sensitive adhesive layer is active energy ray-curable, the total light transmittance of the pressure-sensitive adhesive layer does not substantially change between before the active energy ray-curing and after the active energy ray-curing.

(2) Haze value The haze value of the colored pressure-sensitive adhesive layer 111 (value measured in accordance with JIS K7136: 2000; the same applies hereinafter) is preferably 0.5% or more as a lower limit value, and is preferably 1% or more. It is preferably 1.6% or more, and more preferably 2.2% or more. When the haze value of the colored pressure-sensitive adhesive layer 111 is the above, it is easy to obtain a desired degree of coloring. For example, it is easy to give a sense of unity with a peripheral member (for example, a frame material) to the obtained display body, and the concealment property is excellent. On the other hand, the upper limit of the haze value of the colored pressure-sensitive adhesive layer 111 is preferably 60% or less, preferably 40% or less, particularly preferably 25% or less, and further preferably 10% or less. Is preferable. When the haze value of the colored pressure-sensitive adhesive layer 111 is the above, the visibility as a display body becomes good.

The haze value of the colorless pressure-sensitive adhesive layer 112 is preferably 10% or less, preferably 1% or less, particularly preferably 0.5% or less, and further 0.2% as an upper limit value. The following is preferable. When the haze value of the colorless pressure-sensitive adhesive layer 112 is as described above, the transparency is high, and the pressure-sensitive adhesive layer 11 is suitable for optical applications (for displays). The haze value of the colorless pressure-sensitive adhesive layer 112 is usually 0% or more as a lower limit value.

The haze value of the pressure-sensitive adhesive layer 11 is preferably 60% or less, preferably 40% or less, particularly preferably 25% or less, and further preferably 10% or less as an upper limit value. .. When the haze value of the pressure-sensitive adhesive layer 11 is as described above, the visibility as a display body becomes good. On the other hand, the lower limit of the haze value of the pressure-sensitive adhesive layer 11 is preferably 0.1% or more, preferably 1% or more, and particularly 2% or more, in consideration of the presence of the colored pressure-sensitive adhesive layer 111. It is preferably present, and more preferably 2.5% or more. As a result, it becomes easy to obtain a desired degree of coloring, and for example, it becomes easy to give a sense of unity with a peripheral member (for example, a frame material) to the display body.

When the pressure-sensitive adhesive layer is active energy ray-curable, the haze value of the pressure-sensitive adhesive layer does not substantially change between before the active energy ray-curing and after the active energy ray-curing.

The above optical characteristics can be achieved by appropriately selecting the type and content of the colorant (C) contained in the pressure-sensitive adhesive constituting the color-colored pressure-sensitive adhesive layer 111.

(3) Adhesive Strength The adhesive strength of the colored pressure-sensitive adhesive layer 111 to soda lime glass is preferably 10 N / 25 mm or more, more preferably 20 N / 25 mm or more, and 30 N / 25 mm or more as a lower limit value. Is particularly preferable, and 40 N / 25 mm or more is even more preferable. When the lower limit of the adhesive strength is the above, the blister resistance becomes excellent. The adhesive strength of the colored pressure-sensitive adhesive layer 111 to soda lime glass is preferably 90 N / 25 mm or less, more preferably 70 N / 25 mm or less, and particularly preferably 50 N / 25 mm or less as an upper limit value. .. When the upper limit value of the adhesive force is the above, good reworkability can be obtained, and when a bonding error occurs, the display body constituent member, particularly an expensive display body constituent member can be reused.

When the pressure-sensitive adhesive constituting the colored pressure-sensitive adhesive layer 111 is an active energy ray-curable pressure-sensitive adhesive, the adhesive strength of the colored pressure-sensitive adhesive layer 111 after active energy ray-curing is preferably 20 N / 25 mm or more as a lower limit. , 30N / 25mm or more is particularly preferable, and 40N / 25mm or more is even more preferable. When the lower limit of the adhesive strength is the above, the blister resistance becomes excellent. The adhesive strength of the colored pressure-sensitive adhesive layer 111 to soda lime glass after curing with active energy rays is preferably 100 N / 25 mm or less, more preferably 75 N / 25 mm or less, and 50 N / 25 mm or less as an upper limit value. Is particularly preferable. When the upper limit value of the adhesive force is the above, good reworkability can be obtained, and when a bonding error occurs, the display body constituent member, particularly an expensive display body constituent member can be reused.

The adhesive strength of the colorless pressure-sensitive adhesive layer 112 to soda lime glass is preferably 10 N / 25 mm or more, more preferably 20 N / 25 mm or more, particularly preferably 30 N / 25 mm or more, and 40 N. It is more preferably / 25 mm or more. When the lower limit value of the adhesive force is the above, the uneven followability under high temperature and high humidity conditions becomes excellent. The adhesive strength of the colorless pressure-sensitive adhesive layer 112 to soda lime glass is preferably 90 N / 25 mm or less, more preferably 70 N / 25 mm or less, and particularly preferably 50 N / 25 mm or less as an upper limit value. .. When the upper limit of the adhesive strength is the above, good reworkability can be obtained.

When the pressure-sensitive adhesive constituting the colorless pressure-sensitive adhesive layer 112 is an active energy ray-curable pressure-sensitive adhesive, the adhesive strength of the colorless pressure-sensitive adhesive layer 112 to soda lime glass after active energy ray-curing is 20 N / 25 mm or more as a lower limit. It is preferably 30 N / 25 mm or more, and more preferably 40 N / 25 mm or more. When the lower limit value of the adhesive force is the above, the unevenness followability and the blister resistance under high temperature and high humidity conditions are excellent. The adhesive strength of the colorless pressure-sensitive adhesive layer 112 to soda lime glass after curing with active energy rays is preferably 100 N / 25 mm or less, more preferably 75 N / 25 mm or less, and 50 N / 25 mm or less as an upper limit value. Is particularly preferable. When the upper limit of the adhesive strength is the above, good reworkability can be obtained.

The adhesive strength of the pressure-sensitive adhesive sheet 1 according to the present embodiment to soda lime glass is preferably 10 N / 25 mm or more, more preferably 20 N / 25 mm or more, and particularly preferably 30 N / 25 mm or more as a lower limit value. It is preferably 40 N / 25 mm or more, and more preferably 40 N / 25 mm or more. When the lower limit value of the adhesive force is the above, the unevenness followability and the blister resistance under high temperature and high humidity conditions are excellent. The adhesive strength of the pressure-sensitive adhesive sheet 1 according to the present embodiment to soda lime glass is preferably 90 N / 25 mm or less, more preferably 70 N / 25 mm or less, and particularly 60 N / 25 mm or less as an upper limit value. It is preferably 50 N / 25 mm or less. When the upper limit value of the adhesive force is the above, good reworkability can be obtained, and when a bonding error occurs, the display body constituent member, particularly an expensive display body constituent member can be reused.

When the pressure-sensitive adhesive constituting the colored pressure-sensitive adhesive layer 111 or the colorless pressure-sensitive adhesive layer 112 is an active energy ray-curable pressure-sensitive adhesive, the adhesive strength of the pressure-sensitive adhesive sheet 1 after active energy ray-curing to soda lime glass is 20 N as a lower limit. It is preferably / 25 mm or more, particularly preferably 30 N / 25 mm or more, and even more preferably 40 N / 25 mm or more. When the lower limit value of the adhesive force is the above, the unevenness followability and the blister resistance under high temperature and high humidity conditions are excellent. The adhesive strength of the pressure-sensitive adhesive sheet 1 after curing with active energy rays to soda lime glass is preferably 100 N / 25 mm or less, more preferably 75 N / 25 mm or less, and particularly 65 N / 25 mm or less as an upper limit value. It is preferably 55 N / 25 mm or less. When the upper limit value of the adhesive force is the above, good reworkability can be obtained, and when a bonding error occurs, the display body constituent member, particularly an expensive display body constituent member can be reused.

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

(4) Concavo-convex follow-up rate The followability of the pressure-sensitive adhesive layer to the unevenness of the adherend, that is, the unevenness-following property can be determined using the unevenness-following rate (%) as an index. The unevenness follow-up rate (%) represented by the following formula is preferably 20% or more, particularly preferably 30% or more, and further 40% or more as the lower limit value of the colorless pressure-sensitive adhesive layer 112. Is preferable. The upper limit of the unevenness follow-up rate is not particularly limited, but is usually preferably 80% or less, and particularly preferably 70% or less.

On the other hand, the unevenness follow-up rate (%) of the colored pressure-sensitive adhesive layer 111 does not have to be as high as the unevenness follow-up rate of the colorless pressure-sensitive adhesive layer 112, but is preferably 20% or more, particularly 30% or more as the lower limit. It is preferable, and more preferably 40% or more. The upper limit of the unevenness follow-up rate is not particularly limited, but is usually preferably 80% or less, and particularly preferably 70% or less.

Concavo-convex follow-up rate (%) = {(height of step (μm) maintained in a buried state without bubbles, floating, peeling, etc. after a predetermined durability test) / (thickness of adhesive layer)} × 100
The test method for the unevenness follow-up rate is as shown in a test example described later. Further, in the case of an active energy ray-curable pressure-sensitive adhesive, it is assumed that it is the unevenness follow-up rate when the active energy ray-cured after the adherend is attached.

3. 3. Production of Adhesive Sheet As an example of production of the adhesive sheet 1, a coating solution of the adhesive composition P for forming the colorless pressure-sensitive adhesive layer 112 is applied to the peeling surface of one of the release sheets 12a, and heat treatment is performed. The adhesive composition P is thermally crosslinked to form a coating layer to obtain a release sheet 12a with the coating layer. Further, a coating solution of the adhesive composition P for forming the colored pressure-sensitive adhesive layer 111 is applied to the release surface of the other release sheet 12b, and heat treatment is performed to thermally crosslink the adhesive composition P and apply the coating. A layer is formed to obtain a release sheet 12b with a coating layer. Then, the release sheet 12a with the coating layer and the release sheet 12b with the coating layer are bonded so that both coating layers are in contact with each other. Here, a plurality of release sheets with a coating layer may be prepared, and the coating layers may be bonded in a desired number and in a desired stacking order. When the curing period is required, the curing period is set, and when the curing period is not required, the laminated coating layer becomes the pressure-sensitive adhesive layer 11. As a result, the pressure-sensitive adhesive sheet 1 having the pressure-sensitive adhesive layer 11 which is a laminate of the colored pressure-sensitive adhesive layer 111 and the colorless pressure-sensitive adhesive layer 112 can be obtained. The conditions for heat treatment and curing are as described above.

The coating layer for forming the colorless pressure-sensitive adhesive layer 112 and the coating layer for forming the colored pressure-sensitive adhesive layer 111 may be sandwiched between two release sheets, respectively, to form the colorless pressure-sensitive adhesive layer 112. When the coating layer for forming the coating layer and the coating layer for forming the colored pressure-sensitive adhesive layer 111 are bonded together, one of the release sheets may be peeled off.

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

[Display body]
Types of displays according to this embodiment include, for example, in-vehicle displays in automobile instrument panels, car navigation systems, various instruments provided on consoles, tablet terminals for general users, and the like. Examples thereof include a display body, a display body such as a commercial tablet terminal and a digital signage, and a display body such as an outdoor digital signage. These display bodies may be required to have an appearance harmony with peripheral members and a sense of quality. However, the display body according to the present invention is not limited to these.

As shown in FIG. 2, the display body 2A according to one embodiment includes a first display body constituent member 21 (one display body constituent member) and a second display body constituent member 22 (another display body constituent member). ) And an adhesive layer 11 located between them and for sticking the first display body constituent member 21 and the second display body constituent member 22 to each other.

One of the first display body constituent member 21 and the second display body constituent member 22 may have irregularities on the surface on the side to be bonded by the pressure-sensitive adhesive layer 11. In the embodiment shown in FIG. 2, the first display body component 21 has irregularities on the surface on the pressure-sensitive adhesive layer 11 side due to the printing layer 23.

The pressure-sensitive adhesive layer 11 in the display body 2A is the pressure-sensitive adhesive layer 11 of the pressure-sensitive adhesive sheet 1 described above. The pressure-sensitive adhesive layer 11 in the present embodiment is a laminate of the colored pressure-sensitive adhesive layer 111 and the colorless pressure-sensitive adhesive layer 112, and the colorless pressure-sensitive adhesive layer 112 is located on the side in contact with the unevenness of the printing layer 23.

Examples of the display body 2A include a liquid crystal (LCD) display, a light emitting diode (LED) display, an organic electroluminescence (organic EL) display, electronic paper, and the like, and may be a touch panel.

The first display body constituent member 21 is preferably a protective panel made of a glass plate, a plastic plate, or the like, or a laminated body containing them. In this case, the print layer 23 is generally formed in a frame shape on the pressure-sensitive adhesive layer 11 side of the first display body constituent member 21.

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

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

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

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

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

The material constituting the print layer 23 is not particularly limited, and a known material for printing is used. The thickness of the print layer 23, that is, the lower limit of the height of the step is preferably 3 μm or more, more preferably 5 μm or more, particularly preferably 7 μm or more, and most preferably 10 μm or more. preferable. When the lower limit value is the above, it is possible to sufficiently secure concealment such as making the electrical wiring invisible from the viewer side. The upper limit is preferably 50 μm or less, more preferably 35 μm or less, particularly preferably 25 μm or less, and even more preferably 20 μm or less. By setting the upper limit value as described above, it is possible to prevent deterioration of the unevenness followability of the pressure-sensitive adhesive layer 11 with respect to the printing layer 23 and suppress unevenness in transmittance.

In order to manufacture the display body 2A, as an example, one of the release sheets 12a of the pressure-sensitive adhesive sheet 1 is peeled off, and the exposed colorless pressure-sensitive adhesive layer 112 of the pressure-sensitive adhesive sheet 1 is printed on the first display body component 21. It is bonded to the surface on the side where the layer 23 exists.

After that, the other release sheet 12b is peeled from the pressure-sensitive adhesive layer 11 of the pressure-sensitive adhesive sheet 1, and the exposed colored pressure-sensitive adhesive layer 111 of the pressure-sensitive adhesive sheet 1 and the second display body component 22 are bonded together. Further, as another example, the bonding order of the first display body constituent member 21 and the second display body constituent member 22 may be changed.

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

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

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

In the display body 2A, the colorless pressure-sensitive adhesive layer 112 is laminated on the surface of the first display body constituent member 21 having the unevenness due to the printing layer 23, and the unevenness is absorbed by the colorless pressure-sensitive adhesive layer 112. , The colored pressure-sensitive adhesive layer 111 is suppressed from being compressed or deformed. As a result, unevenness in transmittance in the pressure-sensitive adhesive layer 11 is suppressed, and uneven brightness is suppressed in the display body 2A.

In the display body 2A, when the pressure-sensitive adhesive layer 11 is formed from the pressure-sensitive adhesive composition P, the pressure-sensitive adhesive layer 11 is excellent in unevenness-following property and blister resistance under high temperature and high humidity conditions. Even when the body 2A is placed under high temperature and high humidity conditions (for example, 85 ° C., 85% RH), the occurrence of floating, peeling, etc. is suppressed.

As shown in FIG. 3, the display body 2B according to another embodiment includes a backlight 30, an adhesive layer 11 laminated on the backlight 30, and a diffusion member 41 laminated on the adhesive layer 11. A liquid crystal panel 42 laminated on the diffusion member 41 is provided. The backlight 30 in the display body 2B corresponds to the first display body constituent member, and the laminated body including the diffusion member 41 and the liquid crystal panel 42 corresponds to the second display body constituent member.

The backlight 30 includes one or more substrates 31 and a plurality of light emitters 32 provided on the substrate 31. The backlight 30 has irregularities due to a plurality of light emitters 32.

The pressure-sensitive adhesive layer 11 in the display body 2B is the pressure-sensitive adhesive layer 11 of the pressure-sensitive adhesive sheet 1 described above. The pressure-sensitive adhesive layer 11 in the present embodiment is a laminate of the colored pressure-sensitive adhesive layer 111 and the colorless pressure-sensitive adhesive layer 112, and the colorless pressure-sensitive adhesive layer 112 is located on the side in contact with the unevenness of the light emitting body 32. The plurality of light emitters 32 are sealed by the colorless pressure-sensitive adhesive layer 112 without any voids. As a result, since there are no air layers or voids inside the obtained display body, it is possible to prevent deterioration of image quality due to light reflection loss.

The substrate 31 is not particularly limited, and a substrate generally used for a backlight is used. The substrate 31 is usually a printed circuit board (PCB substrate; Printed Circuit Board).

The substrate 31 may be integrally formed so that a plurality of light emitters 32 are mounted together, or the substrate 31 is separated from each other so that one light emitter 32 is mounted on one substrate 31. It may be formed. When separately formed, each substrate 31 is usually fixed to a frame, a support, a housing, or the like. In the present embodiment, as shown in FIG. 3, it is preferable that the substrate 31 is integrally formed so that a plurality of light emitters 32 are mounted together.

A reflective layer may be formed on the surface of the substrate 31 on the adhesive layer 11 side, or a reflective member may be provided. Thereby, the brightness by the backlight 30 can be effectively improved. As the material of the reflective layer and the reflective member, known materials can be adopted.

Examples of the type of the light emitting body 32 include a light emitting diode (LED), a laser diode (LD), an organic electroluminescence light emitting element, an inorganic electroluminescence light emitting element, and the like. Among these, LEDs are preferable, and mini LEDs or micro LEDs are particularly preferable, from the viewpoint of sealing performance by the pressure-sensitive adhesive layer 11.

The thickness of the illuminant 32 is preferably 10 μm or more, more preferably 30 μm or more, particularly preferably 50 μm or more, and further preferably 80 μm or more. The thickness of the illuminant 32 is preferably 300 μm or less, particularly preferably 150 μm or less, and further preferably 100 μm or less.

The width of the gap between the light emitting bodies 32 adjacent to each other is preferably 0.01 mm or more, particularly preferably 0.1 mm or more, and further preferably 0.5 mm or more. The width of the gap is preferably 100 mm or less, more preferably 10 mm or less, particularly preferably 4 mm or less, and further preferably 2 mm or less.

The shape of the light emitting body 32 is not particularly limited, but is usually a rectangular parallelepiped shape, a hemispherical shape, or the like. The size of the illuminant 32 is also not particularly limited, but from the viewpoint of illuminant sealing property, one side or diameter in a plan view is preferably 0.01 to 100 mm, more preferably 0.1 to 10 mm. In particular, it is preferably 0.2 to 5 mm, and more preferably 0.5 to 2 mm.

The diffusion member 41 is a member that diffuses the light emitted from the backlight 30, and the diffusion member 41 can effectively suppress the occurrence of uneven brightness. As the diffusion member 41, a known one can be adopted, and for example, a diffusion plate, a diffusion film, a combination thereof, or the like can be used. As the liquid crystal panel 42, a known one can be adopted.

A desired optical member is provided between the pressure-sensitive adhesive layer 11 and the diffusion member 41, between the diffusion member 41 and the liquid crystal panel 42, or on the surface of the liquid crystal panel 42 opposite to the diffusion member 41. You may. Examples of such an optical member include a brightness improving film, a contrast improving film, a viewing angle compensating film, a transparent conductive film, a liquid crystal polymer film, a transflective reflective film, and a shatterproof film.

In order to manufacture the display body 2B according to the present embodiment, for example, one of the release sheets 12a of the pressure-sensitive adhesive sheet 1 is peeled off, and the exposed colorless pressure-sensitive adhesive layer 112 of the pressure-sensitive adhesive sheet 1 is attached to the light emitter 32 of the backlight 30. Adhere to the side where is present.

Next, the other release sheet 12b is peeled from the pressure-sensitive adhesive layer 11 of the pressure-sensitive adhesive sheet 1, and the exposed colored pressure-sensitive adhesive layer 111 of the pressure-sensitive adhesive sheet 1 and the diffusion member 41 are bonded together. When the pressure-sensitive adhesive layer 11 is inactive energy ray-curable, the pressure-sensitive adhesive layer 11 is irradiated with active energy rays. The irradiation conditions of the active energy rays and the like are the same as in the case of the display body 2A.

Then, the diffusion member 41 and the liquid crystal panel 42 are bonded together using a desired adhesive sheet. Further, as another example, the bonding order of the backlight 30 and the diffusion member 41 may be changed.

In the display body 2B, the colorless pressure-sensitive adhesive layer 112 is laminated on the surface of the backlight 30 having the unevenness due to the light emitting body 32, and the unevenness is absorbed by the colorless pressure-sensitive adhesive layer 112. Therefore, the colored pressure-sensitive adhesive layer It is suppressed that the 111 is compressed or deformed. As a result, unevenness in transmittance in the pressure-sensitive adhesive layer 11 is suppressed, and uneven brightness is suppressed in the display body 2B.

In the display body 2B, when the pressure-sensitive adhesive layer 11 is formed from the pressure-sensitive adhesive composition P, the pressure-sensitive adhesive layer 11 is excellent in unevenness followability and blister resistance under high temperature and high humidity conditions. Even when the body 2B is placed under high temperature and high humidity conditions (for example, 85 ° C., 85% RH), the occurrence of floating, peeling, etc. is suppressed.

Here, the display body (including the display bodies 2A and 2B) according to the embodiment of the present invention includes one display body constituent member, another display body constituent member, and an adhesive layer for adhering them to each other. One display body constituent member and at least one of the other display body constituent members have irregularities on the surface on the side to be bonded by the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer has at least one. The layer is provided with a colored pressure-sensitive adhesive layer, and the ratio of the luminous flux transmittance in the vicinity of the unevenness to the luminous flux transmittance in the flat portion (luminous flux transmittance in the vicinity of the unevenness / luminous flux transmittance in the flat portion) is 0. It is preferably 980 or more, particularly 0.986 or more, and further preferably 0.990 or more. The upper limit is most preferably 1.

Further, the difference obtained by subtracting the luminous flux transmittance in the vicinity of the uneven portion from the luminous flux transmittance in the flat portion is preferably 1 point or less, more preferably 0.9 point or less, and particularly 0.7. It is preferably points or less, and more preferably 0.5 points or less. The lower limit is most preferably 0 points.

Since the display body has the above-mentioned structure and physical properties, the unevenness of the transmittance is small, and therefore, the unevenness of the brightness of the display body is suppressed. The "neighboring portion of the unevenness" specifically refers to a portion within 10 mm in the plane direction from a position where there is a step due to the unevenness. The above-mentioned "flat portion" refers to a portion sufficiently separated from the unevenness in the plane direction so as not to be affected by the unevenness. The "luminous flux transmittance" refers to the transmittance when the magnitude of the light flux to be transmitted is 7 mmφ. The detailed measurement method of the luminous flux transmittance is as shown in the test example described later.

The above physical properties can be achieved by using the pressure-sensitive adhesive layer 11 of the pressure-sensitive adhesive sheet 1 described above as the pressure-sensitive adhesive layer. However, the present invention is not limited to this, and may be achieved by another pressure-sensitive adhesive layer.

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

For example, either or both of the release sheets 12a and 12b in the pressure-sensitive adhesive sheet 1 may be omitted, and desired optical members may be laminated in place of the release sheets 12a and / or 12b.

Further, as in the pressure-sensitive adhesive sheet 1A shown in FIG. 4, the pressure-sensitive adhesive layer 11 may be a product in which the colorless pressure-sensitive adhesive layer 112, the colored pressure-sensitive adhesive layer 111, and the colorless pressure-sensitive adhesive layer 112 are laminated in that order. good. The pressure-sensitive adhesive sheet 1A is effective when both the first display body component and the second display body component have irregularities on the pressure-sensitive adhesive layer 11.

Further, the pressure-sensitive adhesive layer 11 may be a product in which a colorless pressure-sensitive adhesive layer 112 in which two layers are laminated and a colored pressure-sensitive adhesive layer 111 are laminated, or a colored pressure-sensitive adhesive layer 111 in which two layers are laminated and colorless. It may be one in which the pressure-sensitive adhesive layer 112 is laminated.

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

[Manufacturing Example 1] (Production of Colored Adhesive Sheet)
1. 1. Preparation of (meth) acrylic acid ester polymer 45 parts by mass of 2-ethylhexyl acrylate, 20 parts by mass of n-butyl acrylate, 10 parts by mass of isobornyl acrylate, 5 parts by mass of N-acryloyl morpholine and 2-hydroxyethyl acrylate 20 A (meth) acrylic acid ester polymer (A) was prepared by copolymerizing parts by mass by a solution polymerization method. When the molecular weight of this (meth) acrylic acid ester polymer (A) was measured by the method described later, the weight average molecular weight (Mw) was 600,000.

2. Preparation of Adhesive Composition 100 parts by mass (solid content conversion value; the same applies hereinafter) of the (meth) acrylic acid ester polymer (A) obtained in the above step 1 and trimethyl propane-modified bird as a cross-linking agent (B). 0.2 parts by mass of range isocyanate (manufactured by Toyochem Co., Ltd., product name "BHS8515"), 0.6 parts by mass of carbon black black pigment (C1) as a colorant (C), and an active energy ray-curable component (D). ) As ε-caprolactone-modified tris- (2-acryloxyethyl) isocyanurate (manufactured by Shin-Nakamura Chemical Co., Ltd., product name "NK ester A-9300-1CL") 5.0 parts by mass and a photopolymerization initiator (E). ), 0.5 parts by mass of 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide and 0.3 parts by mass of 3-glycidoxypropyltrimethoxysilane as a silane coupling agent are sufficiently mixed. Was stirred and diluted with methyl ethyl ketone to obtain a coating solution of the adhesive composition.

Here, Table 1 shows each formulation (solid content conversion value) of the adhesive composition when the (meth) acrylic acid ester polymer (A) is 100 parts by mass (solid content conversion value). Details of the abbreviations and the like shown in Table 1 are as follows.
[(Meta) acrylic acid ester polymer (A)]
2EHA: 2-ethylhexyl acrylate BA: n-butyl acrylate MMA: methyl methacrylate IBXA: isobornyl acrylate ACMO: N-acryloylmorpholin AA: HEA acrylate: 2-hydroxyethyl acrylate
[Colorant (C)]
C1 to C2: Carbon black black pigment having the physical characteristics shown in Table 2.

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

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

Next, the coating layer on the heavy-release type release sheet obtained above and the light-release type release sheet obtained by peeling one side of the polyethylene terephthalate film with a silicone-based release agent (manufactured by Lintec, product name "SP-PET38131"). And are bonded so that the peeled surface of the light peeling type peeling sheet comes into contact with the coating layer, and the heavy peeling type peeling sheet / colored pressure-sensitive adhesive layer (a) (thickness: 50 μm) / light peeling type peeling sheet A colored adhesive sheet having the above composition was produced.

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

[Manufacturing Examples 2 to 5] (Production of colored adhesive sheet)
Types and proportions of each monomer constituting the (meth) acrylic acid ester polymer (A), weight average molecular weight (Mw) of the (meth) acrylic acid ester polymer (A), blending amount of the cross-linking agent (B), coloring. The type and amount of the agent (C), the amount of the active energy ray-curable component (D), the amount of the photopolymerization initiator (E), and the amount of the silane coupling agent have been changed as shown in Table 1. In the same manner as in Example 1, the colored pressure-sensitive adhesive layer (b) (Production Example 2), the colored pressure-sensitive adhesive layer (c) (Production Example 3), the colored pressure-sensitive adhesive layer (d) (Production Example 4), And a colored pressure-sensitive adhesive sheet having the colored pressure-sensitive adhesive layer (e) (Production Example 5) was produced.

The colored pressure-sensitive adhesive layer (b) produced in Production Example 2 is made of an active energy ray non-curable pressure-sensitive adhesive, and the other colored pressure-sensitive adhesive layers (a), (c) to (e) are active. It consisted of an energy ray-curable adhesive.

[Manufacturing Examples 6 to 7] (Production of colorless adhesive sheet)
Types and proportions of each monomer constituting the (meth) acrylic acid ester polymer (A), weight average molecular weight (Mw) of the (meth) acrylic acid ester polymer (A), blending amount of the cross-linking agent (B), coloring Table 1 shows the blending amount of the agent (C) (without blending), the blending amount of the active energy ray-curable component (D), the blending amount of the photopolymerization initiator (E), and the blending amount of the silane coupling agent. A colorless pressure-sensitive adhesive sheet having a colorless pressure-sensitive adhesive layer (f) (Production Example 6) and a colorless pressure-sensitive adhesive layer (g) (Production Example 7) was produced in the same manner as in Example 1.

The colorless pressure-sensitive adhesive layer (f) produced in Production Example 6 is made of an active energy ray-curable pressure-sensitive adhesive, and the colorless pressure-sensitive adhesive layer (g) produced in Production Example 7 is non-curable with active energy rays. It consisted of an adhesive.

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

[Example 1]
The lightly peelable release sheet was peeled off from the colored pressure-sensitive adhesive sheet produced in Production Example 1 to expose the colored pressure-sensitive adhesive layer (a). Further, the light release type release sheets were peeled off from the two colorless pressure-sensitive adhesive sheets produced in Production Example 6, respectively, to expose the first and second colorless pressure-sensitive adhesive layers (f). The first colorless pressure-sensitive adhesive layer (f) is laminated on the exposed colored pressure-sensitive adhesive layer (a), and the heavy-release type release sheet is peeled off from the first colorless pressure-sensitive adhesive layer (f) to form a first colorless pressure-sensitive adhesive layer (f). The pressure-sensitive adhesive layer (f) was exposed. A second colorless pressure-sensitive adhesive layer (f) was laminated on the exposed first colorless pressure-sensitive adhesive layer (f). Then, it was cured for 7 days under the conditions of 23 ° C. and 50% RH.

In this way, the heavy peeling type release sheet / colored pressure-sensitive adhesive layer (a) (first layer; 50 μm) / colorless pressure-sensitive adhesive layer (f) (second layer; 50 μm) / colorless pressure-sensitive adhesive layer (f) (first layer). An adhesive sheet composed of 3 layers; 50 μm) / heavy release type release sheet was produced. The first layer is attached to a flat adherend, and the third layer is attached to an adherend having irregularities.

[Examples 2 to 9, Comparative Examples 1 to 3]
A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive layers of the first layer, the second layer, and the third layer were changed as shown in Table 4. In Example 8, only the pressure-sensitive adhesive layer composed of the first layer and the second layer was used.

[Test Example 1] (Measurement of gel fraction)
The adhesive sheet produced in each production example is cut into a size of 80 mm × 80 mm, the adhesive layer is wrapped in a polyester mesh (mesh size 200), the mass is weighed with a precision balance, and the mass of the mesh alone is measured. Was subtracted to calculate the mass of the adhesive alone. The mass at this time is M1.

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

Further, the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet produced in Production Examples 1 and 3 to 6 is irradiated with active energy rays (ultraviolet rays; UV) under the following conditions through the light-release type release sheet to form the pressure-sensitive adhesive layer. It was cured to form an adhesive layer after curing. For the pressure-sensitive adhesive in the cured pressure-sensitive adhesive layer, the gel fraction (after UV) was derived in the same manner as above. The results are shown in Table 3.

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

[Test Example 2] (Measurement of storage elastic modulus)
The release sheet was peeled off from the pressure-sensitive adhesive sheet produced in each production example, and a plurality of layers of the pressure-sensitive adhesive layer were laminated so as to have a thickness of 3 mm. A cylinder (height 3 mm) having a diameter of 8 mm was punched out from the obtained laminated body of the pressure-sensitive adhesive layer, and this was used as a sample.

The above sample is subjected to a torsional shear method using a viscoelasticity measuring device (manufactured by Physica, product name "MCR300") in accordance with JIS K7244-6, and has a storage elastic modulus (before UV; MPa) at 23 ° C. under the following conditions. ) Was measured. The results are shown in Table 3.
Measurement frequency: 1Hz
Measurement temperature: 23 ° C

Further, with respect to the pressure-sensitive adhesive sheets prepared in Production Examples 1 and 3, the same sample as above was irradiated with active energy rays (ultraviolet rays; UV) under the same conditions as in Test Example 1 to apply the pressure-sensitive adhesive. By curing, a sample after irradiation with active energy rays was obtained. With respect to the obtained sample after irradiation with active energy rays, the storage elastic modulus (after UV; MPa) at 23 ° C. was measured in the same manner as the sample before irradiation with active energy rays. The results are shown in Table 3.

[Test Example 3] (Measurement of total light transmittance)
The pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet produced in each production example was bonded to glass, and this was used as a measurement sample. After performing background measurement with glass, all light rays of the above measurement sample were measured using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name "SH-7000") in accordance with JIS K7361-1: 1997. The transmittance (%) was measured. The results are shown in Table 3.

Further, the surface of the pressure-sensitive adhesive sheet produced in Examples and Comparative Examples on the third layer side was bonded to glass, and the total light transmittance (%) was measured in the same manner as described above. The pressure-sensitive adhesive sheets produced in Examples 1, 3 to 5, 7 to 9 and Comparative Examples 1 to 3 were irradiated with active energy rays under the same conditions as in Test Example 1 to cure the pressure-sensitive adhesive. After that, the above measurement was performed. The results are shown in Table 5.

[Test Example 4] (Measurement of haze value)
For the adhesive layer of the adhesive sheet produced in each production example, the haze value (%) was measured using a haze meter (manufactured by Nippon Denshoku Industries Co., Ltd., product name "SH-7000") according to JIS K7136: 2000. did. The results are shown in Table 3.

In addition, the haze value (%) was measured in the same manner as above for the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheets produced in Examples and Comparative Examples. The pressure-sensitive adhesive sheets produced in Examples 1, 3 to 5, 7 to 9 and Comparative Examples 1 to 3 were irradiated with active energy rays under the same conditions as in Test Example 1 to cure the pressure-sensitive adhesive. After that, the above measurement was performed. The results are shown in Table 5.

[Test Example 5] (Measurement of adhesive strength)
The light release type release sheet is peeled off from the adhesive sheet produced in each production example, and the exposed adhesive layer is a polyethylene terephthalate (PET) film having an easy adhesive layer (manufactured by Toyo Boseki Co., Ltd., product name "PET A4300", thickness). : 100 μm) was bonded to an easy-adhesive layer to obtain a laminate of a release sheet / adhesive layer / PET film. The obtained laminate was cut into a width of 25 mm and a length of 100 mm, and this was used as a sample.

In an environment of 23 ° C. and 50% RH, the heavy release type release sheet is peeled off from the above sample, the exposed adhesive layer is attached to soda lime glass (manufactured by Nippon Sheet Glass Co., Ltd.), and then the autoclave manufactured by Kurihara Seisakusho Co., Ltd. is used. The pressure was increased at 0.5 MPa and 50 ° C. for 20 minutes. Then, after leaving it for 24 hours under the conditions of 23 ° C. and 50% RH, a tensile tester (manufactured by Orientec Co., Ltd., product name "Tencilon") was used under the conditions of a peeling speed of 300 mm / min and a peeling angle of 180 degrees. Adhesive strength (before UV; N / 25 mm) was measured. Conditions other than those described here were measured in accordance with JIS Z0237: 2009. The results are shown in Table 3.

On the other hand, a PET film is laminated on the surface on the first layer side of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheets produced in Examples and Comparative Examples, and the surface on the third layer side is attached to soda lime glass in the same manner as described above. Adhesive strength (before UV; N / 25 mm) was measured. The results are shown in Table 5.

Further, for the pressure-sensitive adhesive sheets produced in Production Examples 1 and 3 to 6, the pressure-sensitive adhesive layer was attached to soda lime glass in the same manner as described above, autoclaved, and then 24 under the conditions of 23 ° C. and 50% RH. After leaving it for a while, the PET film was irradiated with active energy rays under the same conditions as in Test Example 1 to cure the pressure-sensitive adhesive layer. The adhesive strength (after UV; N / 25 mm) of the cured pressure-sensitive adhesive layer was measured in the same manner as described above. The results are shown in Table 3.

On the other hand, with respect to the pressure-sensitive adhesive sheets produced in Examples 1, 3 to 5, 7 to 9 and Comparative Examples 1 to 3, a PET film was laminated on the surface on the first layer side of the pressure-sensitive adhesive layer, and the surface on the third layer side was laminated. Was affixed to soda lime glass, and then the adhesive strength (after UV; N / 25 mm) after irradiation with active energy rays was measured in the same manner as above. The results are shown in Table 5.

[Test Example 6] (Measurement of unevenness follow-up rate)
On the surface of a glass plate (manufactured by NSG Precision Co., Ltd., product name "Corning Glass Eagle XG", length 90 mm x width 50 mm x thickness 0.5 mm), UV curable ink (manufactured by Teikoku Ink Co., Ltd., product name "POS-911 ink") ) Was screen-printed in a frame shape (outer shape: length 90 mm × width 50 mm, width 5 mm). Next, the printed ultraviolet curable ink is cured by irradiating with ultraviolet rays (80 W / cm ² , 2 metal halide lamps, lamp height 15 cm, belt speed 10 to 15 m / min), and a step (height of the step) due to printing is cured. A stepped glass plate having one of 5 μm, 10 μm, 15 μm, 20 μm, and 25 μm) was prepared.

The light release type release sheet is peeled off from the adhesive sheet produced in each production example, and the exposed adhesive layer is a polyethylene terephthalate (PET) film having an easy adhesive layer (manufactured by Toyobo Co., Ltd., product name "PET A4300", thickness: It was bonded to an easy-adhesion layer of 100 μm). Next, the heavy-release type release sheet was peeled off to expose the pressure-sensitive adhesive layer. Then, using a laminator (manufactured by Fujipla, product name "LPD3214"), the laminate was laminated on each stepped glass plate so that the adhesive layer covered the entire surface of the frame-shaped print, and this was used as an evaluation sample. did.

The obtained evaluation sample was autoclaved for 30 minutes under the conditions of 50 ° C. and 0.5 MPa, and then left at normal pressure at 23 ° C. and 50% RH for 24 hours. The pressure-sensitive adhesive sheets produced in Production Examples 1 and 3 to 6 were irradiated with active energy rays through the PET film under the same conditions as in Test Example 1 to cure the pressure-sensitive adhesive layer.

Then, it was stored for 72 hours under high temperature and high humidity conditions of 85 ° C. and 85% RH (durability test), and then the unevenness followability was evaluated. The unevenness followability is judged by whether or not the printing step is completely filled with the adhesive layer, and if bubbles, floating, peeling, etc. are observed at the interface between the printing step and the adhesive layer, the printing step is affected. It is judged that the unevenness could not be followed. Here, the unevenness following property was evaluated as the unevenness following rate (%) represented by the following formula. The results are shown in Table 3.
Concavo-convex follow-up rate (%) = {(height of step (μm) maintained in a buried state without bubbles, floating, peeling, etc. after durability test) / (thickness of adhesive layer)} × 100

[Test Example 7] (Evaluation of blister resistance)
One of the heavy-release type release sheets was peeled off from the adhesive sheets obtained in Examples and Comparative Examples, and the surface of the exposed adhesive layer on the third layer side was a plastic plate (Mitsubishi Gas Chemical Co., Ltd.) in which a PMMA layer was laminated on a PC plate. A plastic plate with an adhesive layer was obtained by affixing it to the PC plate side manufactured by the company, product name "Iupilon sheet MR58U", thickness: 0.7 mm, containing an ultraviolet absorber).

The other heavy-release type release sheet is peeled off from the plastic plate with the adhesive layer obtained above, and the surface of the exposed adhesive layer on the first layer side is a soda lime glass plate having a size of 70 mm × 150 mm (Japan). It was affixed to a plate glass company, thickness: 0.7 mm). Then, it was autoclaved for 20 minutes under the conditions of 50 ° C. and 0.5 MPa, and left at normal pressure at 23 ° C. and 50% RH for 24 hours.

For the pressure-sensitive adhesive sheets produced in Examples 1, 3 to 5, 7 to 9 and Comparative Examples 1 to 3, active energy rays were applied to the pressure-sensitive adhesive layer through a plastic plate under the same conditions as in Test Example 1. Irradiation was performed to cure the pressure-sensitive adhesive layer. In this way, a structure (70 mm × 150 mm) in which a plastic plate and a glass plate were bonded together by an adhesive layer was obtained.

The above components were stored for 72 hours under high temperature and high humidity conditions of 85 ° C. and 85% RH. Then, after curing, the state at the interface between the adhesive layer and the adherend (plastic plate, glass plate) was visually confirmed, and the blister resistance was evaluated according to the following criteria. The results are shown in Table 5.
◎… There were no bubbles, floats, or peeling.
○… There was no floating or peeling, and a few bubbles were generated, but it was at a level that was not a problem.
×… Floating / peeling occurred.

[Test Example 8] (Measurement of luminous flux transmittance)
As shown in FIG. 5, an adhesive is used at the center of the upper surface of a soda lime glass plate (manufactured by Nippon Sheet Glass Co., Ltd., length 70 mm × width 70 mm × thickness 1.1 mm) as the substrate 51, and a convex portion 52 is used. A polyethylene terephthalate (PET) film (manufactured by Unitika Ltd., product name "emblet", length 10 mm x width 10 mm x thickness 12 μm) was attached as an adherend 5.

One of the heavy-release type release sheets was peeled off from the pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples to expose the surface of the pressure-sensitive adhesive layer on the third layer side. Then, as shown in FIG. 6, the surface of the exposed pressure-sensitive adhesive layer 11 on the third layer side was attached to the surface of the adherend 5 on the side where the convex portion 52 exists. Then, it was autoclaved for 20 minutes under the conditions of 50 ° C. and 0.5 MPa, and left at normal pressure at 23 ° C. and 50% RH for 24 hours. Finally, the other heavy-release type release sheet was peeled off from the pressure-sensitive adhesive layer 11, and this was used as a sample.

A small diameter measurement attachment (manufactured by Japanese Industrial Standards Co., Ltd.) is used to transmit light with a luminous flux of 7 mmφ to a flat portion of the sample, specifically, a position 15 to 25 mm away from the edge of the convex portion 52. The luminous flux transmittance (%) of the flat portion was measured according to JIS K7361-1: 1997. The luminous flux transmittance of the flat portion was measured at 5 points, and the average value was taken as the luminous flux transmittance (%) of the flat portion. An example of the luminous flux of the flat portion is shown by L1 in FIG.

Further, in the same manner as above, light with a luminous flux of 7 mmφ is transmitted to a portion near the unevenness of the sample, specifically, a position within 10 mm from the edge of the convex portion 52 (inside the frame of the dotted line in FIG. 5). The luminous flux transmittance (%) in the vicinity of the unevenness was measured. The luminous flux transmittance in the vicinity of the unevenness was measured at 5 points, and the average value was taken as the luminous flux transmittance (%) in the vicinity of the unevenness. An example of the luminous flux in the vicinity of the unevenness is shown by L2 in FIG.

The difference (point) was calculated by subtracting the luminous flux transmittance in the vicinity of the unevenness from the obtained luminous flux transmittance in the flat portion. In addition, the ratio of the luminous flux transmittance in the vicinity of the unevenness to the luminous flux transmittance in the obtained flat portion (luminous flux transmittance in the vicinity of the unevenness / luminous flux transmittance in the flat portion) was calculated. The results of each are shown in Table 5.

[Test Example 9] (Evaluation of light transmission unevenness)
The sample prepared in Test Example 8 was placed on a tablet terminal (manufactured by Apple Inc., product name "iPad (registered trademark)", resolution: 264 ppi) with the substrate side facing down. For this sample, it was visually judged whether or not there was unevenness in light transmission, and the unevenness in light transmission was evaluated according to the following criteria. The results are shown in Table 5.
◎… There was no unevenness in light transmission.
〇… There was slight unevenness in light transmission, but it was at a level that was not a problem.
×: There was unevenness in light transmission.

[Test Example 10] (Evaluation of concealment)
The adhesive sheets obtained in Examples and Comparative Examples were cut into a length of 70 mm × a width of 70 mm, and the adhesive layer of the adhesive sheet was formed into two soda lime glass plates (manufactured by Nippon Sheet Glass Co., Ltd., length 70 mm × width 70 mm × thickness). They were pasted together so as to be sandwiched between them (1.1 mm). For the pressure-sensitive adhesive sheets produced in Examples 1, 3 to 5, 7 to 9 and Comparative Examples 1 to 3, one of the soda lime glass plates was irradiated with active energy rays under the same conditions as in Test Example 1. The pressure-sensitive adhesive layer was cured. These were used as samples in this test example.

As backgrounds, black background 1 (L *: 29.8, a *: -0.7, b *: 0.6) and black background 2 (L *: 39.2, a *: -0.4). , B *: 0.4) were printed on paper, respectively. Then, the black background 2 was arranged so as to be staggered and overlapped on the black background 1 to form a boundary portion between the black background 1 and the black background 2.

The sample was placed on a background including the boundary. Then, at a position 50 cm from the sample, whether or not the boundary portion is concealed (the boundary portion becomes difficult to see and there is a sense of unity) is determined under a three-wavelength fluorescent lamp (distance from the fluorescent lamp: 200 cm). , Judgment was made visually, and the concealment property was evaluated according to the following criteria. The results are shown in Table 5.
⊚: The boundary was sufficiently concealed.
◯: The boundary was concealed to some extent.
X: The boundary was not clearly concealed.

The colors of the black backgrounds 1 and 2 (L * a * b * defined by the CIE1976 L * a * b * color system) are spectrophotometers (manufactured by BYK, product name "Spectro-Guide"). It was measured using ").

[Test Example 11] (Evaluation of visibility)
On a display with a size of 15.6 inches and a resolution of 1366 x 768 (manufactured by Fujitsu Limited, product name "LITEBOOK A574 / H"), white background and black characters (font: MS P Gothic) are 5 to 20 points in size. It was displayed as 100% in 1-point increments.

A sample prepared in the same manner as in Test Example 10 was placed on the display. Then, the size of the characters visually recognizable was confirmed at a position 50 cm from the display, and the visibility was evaluated according to the following criteria. The results are shown in Table 3.
⊚: 6-point characters could be visually recognized.
◯: The 6-point character was not completely visible, but the 8-point character was visible.
Δ: The 8-point character was not completely visible, but the 15-point character was visible.
X: The 15-point character could not be visually recognized.

As can be seen from Table 5, the pressure-sensitive adhesive sheets obtained in the examples were those in which the unevenness of the transmittance was suppressed, and further excellent in concealment and visibility. Further, as can be seen from Tables 3 and 5, the pressure-sensitive adhesive sheets obtained in the examples were also excellent in unevenness followability and blister resistance.

The adhesive sheet of the present invention can be suitably used for, for example, in a display body having a black frame material, for bonding a display body constituent member having irregularities and a desired display body constituent member.

1,1A ... Adhesive sheet 11 ... Adhesive layer 111 ... Colored adhesive layer 112 ... Colorless adhesive layer 12a, 12b ... Release sheet 2A, 2B ... Display 21 ... First display component 22 ... Second display Body constituent member 23 ... Print layer 30 ... Backlight 31 ... Substrate 32 ... Light emitter 41 ... Diffusing member 42 ... Liquid crystal panel 5 ... Adhesive 51 ... Substrate 52 ... Convex part L1 ... Light beam in flat part L2 ... In the vicinity of unevenness Light beam

Claims (7)

An adhesive sheet having an adhesive layer to be attached to an adherend having irregularities on its surface.
The pressure-sensitive adhesive layer is a laminate of at least one colored pressure-sensitive adhesive layer and at least one colorless pressure-sensitive adhesive layer.
The colorless pressure-sensitive adhesive layer is located on the surface of the pressure-sensitive adhesive layer that comes into contact with the unevenness of the adherend.
A pressure-sensitive adhesive sheet having a total light transmittance of 3% or more of the pressure-sensitive adhesive layer. The pressure-sensitive adhesive sheet according to claim 1, wherein the colorless pressure-sensitive adhesive layer located on the surface of the adherend in contact with the unevenness is thicker than the depth or height of the unevenness of the adherend. .. The pressure-sensitive adhesive sheet according to claim 1 or 2, wherein the pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer for adhering one display body component and another display body component. The pressure-sensitive adhesive sheet according to any one of claims 1 to 3, wherein the pressure-sensitive adhesive constituting the colorless pressure-sensitive adhesive layer has a storage elastic modulus of 0.01 MPa or more and 1 MPa or less at 23 ° C. The pressure-sensitive adhesive sheet according to any one of claims 1 to 4, wherein the pressure-sensitive adhesive constituting the colored pressure-sensitive adhesive layer has a storage elastic modulus of 0.01 MPa or more and 1 MPa or less at 23 ° C. Two release sheets and
The pressure-sensitive adhesive sheet according to any one of claims 1 to 5, further comprising the pressure-sensitive adhesive layer sandwiched between the two release sheets so as to be in contact with the peel-off surfaces of the two release sheets. One display body component and
With other display body components,
A display body including the one display body component and an adhesive layer for adhering the other display body components to each other.
At least one of the one display body component and the other display body component has irregularities on the surface on the side to be bonded by the pressure-sensitive adhesive layer.
A display body characterized in that the pressure-sensitive adhesive layer is the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet according to any one of claims 1 to 6.

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