KR20190020607A - Adhesive sheet and display - Google Patents

Abstract

The present invention relates to an adhesive sheet (1) at least having an adhesive layer (11) composed of an active energy ray hardening adhesive. The adhesive sheet (1) inserts an adhesive layer after hardening (11′) formed by hardening the adhesive layer (11) by irradiating with an active energy ray between two sheets of tetron mesh #380, has vapor transmittance of the adhesive layer after hardening (11′) of 108 g/(m^2·24 h·100 μm) or greater and 200 g/(m^2·24 h·100 μm) or smaller, wherein the vapor transmittance is measured based on JIS K7129 under a condition of 40°C and 90% RH, and has a gel fraction of an adhesive forming the adhesive layer after hardening (11′) of 60% or higher and 95% or lower. Furthermore, the adhesive sheet (1) is excellent in both of blister resistance and moist-heat whitening resistance.

Description

ADHESIVE SHEET AND DISPLAY [0002]

The present invention relates to a pressure-sensitive adhesive sheet suitable for use in a display (display), and a display body obtained by using the same.

2. Description of the Related Art Various mobile electronic devices such as smart phones and tablet terminals in recent years are equipped with a display using a display module having a liquid crystal element, a light emitting diode (LED element), an organic electroluminescence (organic EL) The number of cases where the display is a touch panel is also increasing.

In the above-described display, a protective panel is usually provided on the surface side of the display module. Along with the reduction in thickness and weight of electronic devices, the protective panel has been changed from a conventional glass plate to a plastic plate such as an acrylic plate or a polycarbonate plate.

Here, a gap is provided between the protective panel and the display body module so that the deformed protective panel does not hit the display body module even when the protective panel is deformed by an external force.

However, when such air gaps are present, there is a problem that the reflection loss of light due to the difference in refractive index between the protective panel and the air layer and the refractive index difference between the air layer and the display module is large, .

Thus, it has been proposed to improve the image quality of the display by filling the space between the protective panel and the display module with the pressure-sensitive adhesive layer. For example, Patent Document 1 discloses a pressure-sensitive adhesive layer that fills the gap between the protective panel and the display module, has a shear storage modulus (G ') at 25 ° C and 1 Hz of 1.0 10 ⁵ Pa or less, And a gel fraction of 40% or more.

However, as in Patent Document 1, when the storage elastic modulus at room temperature is lowered in the pressure-sensitive adhesive layer, the storage elastic modulus at high temperature is lowered more than necessary, and a problem occurs under durability conditions. For example, when a high-temperature and high-humidity condition is applied, an out gas is generated from a plastic plate as a protective panel, and blisters such as bubbles, lifting, and peeling are generated. Further, in the conventional pressure-sensitive adhesive layer, there is a case where the pressure-sensitive adhesive layer becomes white when the pressure is returned to room temperature and normal after high-temperature and high-humidity (wet heat) conditions are performed.

Thus, Patent Documents 2 and 3 disclose a pressure-sensitive adhesive for a touch panel containing an acryl-based polymer containing a predetermined monomer unit from the viewpoint of improving blister resistance and anti-wet heat resistance. However, even when these pressure-sensitive adhesives were used, the blister resistance and the anti-wet heat resistance were not sufficient.

Japanese Patent Laid-Open No. 2010-97070 Japanese Patent Application Laid-Open No. 2013-1769 Japanese Patent Application Laid-Open No. 2016-44293

It is an object of the present invention to provide a pressure-sensitive adhesive and a pressure-sensitive adhesive sheet which are excellent in both blister resistance and anti-wet heat resistance.

In order to achieve the above object, first, the present invention provides a pressure-sensitive adhesive sheet having at least a pressure-sensitive adhesive layer composed of an active energy ray-curable pressure-sensitive adhesive, wherein the pressure- The pressure-sensitive adhesive layer was sandwiched between two pieces of Tetralon mesh # 380 and the vapor permeability of the pressure-sensitive adhesive layer measured in accordance with JIS K7129 under the conditions of 40 ° C and 90% RH was 108 g / (m 2 · 24 h · (M 2 · 24 h · 100 μm) or less, and the gel fraction of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer after curing is 60% or more and 95% or less (the invention One).

In the pressure-sensitive adhesive sheet according to the invention (Invention 1), since the water vapor transmission rate of the pressure-sensitive adhesive layer after curing is within the above-mentioned range, condensation of moisture in the pressure-sensitive adhesive layer after curing becomes difficult to occur. Therefore, whitening of the pressure-sensitive adhesive layer after curing is restrained when the pressure-sensitive adhesive layer after curing is put under high-temperature and high-humidity conditions and then returned to room temperature and normal humidity. Further, since the gel fraction of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer after curing is in the above-mentioned range, the pressure-sensitive adhesive exhibits excellent cohesive force, and the resulting display material can exhibit excellent blister resistance.

In the above invention (Invention 1), the pressure-sensitive adhesive layer is sandwiched between a glass plate and a plastic plate having a thickness of 0.7 mm by curing the pressure-sensitive adhesive layer by irradiation of an active energy ray, And the laminate was subjected to a durability test in which the laminate was stored under a moist heat condition at 85 ° C and 85% RH for 1000 hours. Next, haze at the time of storage at normal temperature and normal humidity at 23 ° C and 50% RH for 24 hours Value obtained by subtracting the haze value before the durability test is less than 1.5 (invention 2).

In the above invention (Invention 1 or 2), the pressure-sensitive adhesive layer having a thickness of 50 μm is sandwiched between a glass plate and a plastic plate having a thickness of 2.0 mm. The pressure-sensitive adhesive layer is cured by irradiation of active energy rays, A pressure-sensitive adhesive layer, and then subjected to an endurance test on the laminate for 1000 hours at 85 ° C and 85% RH under humidity conditions. Next, when the laminate was stored for 24 hours at normal temperature and normal humidity at 23 ° C and 50% RH The value obtained by subtracting the haze value before the durability test from the haze value is preferably less than 8 (invention 3).

In the above invention (inventions 1 to 3), the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer has a crosslinked structure composed of the (meth) acrylic acid ester polymer (A) and the crosslinking agent (B) It is preferable to contain the component (C) (invention 4).

In the above inventions (inventions 1 to 4), it is preferable to include two peeling sheets and the pressure-sensitive adhesive layer sandwiched between the peeling sheets so as to contact the peeling surfaces of the two peeling sheets 5).

Secondly, the present invention provides a display body having one display body constituting member, another display body constituting member, and a post-curing pressure-sensitive adhesive layer for bonding the one display body constituting member and the other display body constituting member to each other, Wherein at least one of the one display body constituting member and the other display body constituting member is made of a plastic plate and the cured pressure sensitive adhesive layer is formed by curing the pressure sensitive adhesive layer of the pressure sensitive adhesive sheet (inventions 1 to 5) (6), wherein the adhesive layer is a post-adhesive layer.

In the above invention (Invention 6), it is preferable that the plastic plate has a thickness of 100 탆 and a water vapor permeability of not less than 0.001 g / (m 2 24 h 揃 100 袖 m) measured in accordance with JIS K7129 under conditions of 40 캜 and 90% RH, / (M 2 · 24 h · 100 μm) or less (Invention 7).

In the above invention (inventions 6 and 7), it is preferable that the one member of the display member has a vapor transmissivity of not less than 0.001 g / (m 2 · 24 h) measured in accordance with JIS K7129 under conditions of 40 ° C. and 90% RH, (M < 2 > 24h), and the vapor permeability of the other display component member measured at 40 DEG C and 90% RH in accordance with JIS K7129 is 0.001 g / 8).

The pressure-sensitive adhesive sheet and the display body according to the present invention are excellent in both blister resistance and anti-wet heat resistance.

1 is a sectional view of a pressure-sensitive adhesive sheet according to an embodiment of the present invention;
2 is a sectional view of a display body according to an embodiment of the present invention;

Hereinafter, an embodiment of the present invention will be described.

[Adhesive sheet]

The pressure-sensitive adhesive sheet according to the present embodiment is a pressure-sensitive adhesive sheet having at least a pressure-sensitive adhesive layer composed of an active energy ray-curable pressure-sensitive adhesive, and is preferably a pressure-sensitive adhesive sheet formed by laminating a release sheet on one side or both sides of the pressure-

Fig. 1 shows a specific configuration as an example of the pressure-sensitive adhesive sheet according to the present embodiment.

1, the pressure-sensitive adhesive sheet 1 according to one embodiment is formed by two sheets of release sheets 12a and 12b and two sheets of release sheets 12a and 12b in contact with the release surfaces of the two release sheets 12a and 12b, And a pressure-sensitive adhesive layer 11 sandwiched between the release sheets 12a and 12b. In the present specification, the release surface of the release sheet refers to a surface having release properties in the release sheet, and includes both the surface subjected to the release treatment and the surface exhibiting the release property without performing the release treatment.

The adhesive sheet 1 according to the present embodiment can be used for manufacturing the display body 2 as illustrated in Fig. In this case, for example, the first display body constituting member 21 (one display body constituting member), the pressure-sensitive adhesive layer 11 of the pressure-sensitive adhesive sheet 1, and the second display body constituting member 22 And the pressure sensitive adhesive layer 11 is irradiated with an active energy ray. As a result, the pressure-sensitive adhesive layer 11 is cured to form a cured pressure-sensitive adhesive layer 11 ', and the first display body constituting member 21, the cured pressure-sensitive adhesive layer 11' The display member 2 in which the members 22 are laminated in this order is obtained.

1. Properties of adhesive sheet

(1) Vapor permeability

In the pressure-sensitive adhesive sheet 1 according to the present embodiment, the cured pressure-sensitive adhesive layer 11 'formed by curing the pressure-sensitive adhesive layer 11 having a thickness of 100 μm by irradiation of an active energy ray is divided into two pieces of Tetron Mesh # And the water vapor permeability of the cured pressure-sensitive adhesive layer 11 'measured according to JIS K7129 under the conditions of 40 ° C and 90% RH is 108 g / (m 2 · 24 h · 100 μm) or more and 110 g / 24h 占 100 占 퐉), and particularly preferably at least 115 g / (m2 占 24h 占 100 占 퐉). The water vapor permeability is preferably 200 g / (m 2 · 24 h · 100 μm) or less, more preferably 180 g / (m 2 · 24 h · 100 μm) or less and particularly preferably 160 g / (m 2 · 24 h · 100 μm) , And 150 g / (m 2 · 24 h · 100 μm) or less.

In the pressure-sensitive adhesive sheet 1 according to the present embodiment, since the water vapor transmission rate of the pressure-sensitive adhesive layer 11 'after curing is in the above-mentioned range, the pressure-sensitive adhesive layer 11' exhibits excellent hydrophilicity. The post-curing pressure-sensitive adhesive layer 11 'having excellent hydrophilicity as described above allows the moisture penetrated into the cured pressure-sensitive adhesive layer 11' under the high-temperature and high-humidity conditions to flow into the pressure- It is presumed that the pressure-sensitive adhesive layer 11 'is easily released from the cured pressure-sensitive adhesive layer 11'. Therefore, the condensation of the moisture in the pressure-sensitive adhesive layer 11 'after curing is less likely to occur, and the whitening of the pressure-sensitive adhesive layer 11' after curing is suppressed. That is, the pressure-sensitive adhesive sheet 1 according to the present embodiment is excellent in anti-wet heat resistance.

In the pressure-sensitive adhesive sheet 1 according to the present embodiment, if the water vapor permeability of the pressure-sensitive adhesive layer 11 'after curing is less than 108 g / (m 2 · 24 h · 100 μm), the hydrophilic property of the pressure-sensitive adhesive layer 11' It is not high. Thereby, when the moisture intruding into the cured pressure-sensitive adhesive layer 11 'when the display body 2 is placed under the high-temperature and high-humidity condition is returned to the room temperature normal humidity after the display body 2 is returned to the room- It is difficult to get off well. As a result, the condensation of the moisture in the pressure-sensitive adhesive layer 11 'after curing is liable to occur, and the whitening of the pressure-sensitive adhesive layer 11' after curing can not be sufficiently suppressed. If the water vapor permeability along the pressure-sensitive adhesive layer 11 'after curing exceeds 200 g / (m 2 · 24 h · 100 μm), a metal member such as an electrode is adhered to the first display body constituting member 21 or the second display body Is present on the surface of the constituent member 22 on the side of the pressure-sensitive adhesive layer 11 'after curing, corrosion of the metal member may occur. The test method for the water vapor transmission rate is as shown in the following test examples.

(2) Gel fraction

In the pressure-sensitive adhesive sheet 1 according to the present embodiment, the gel fraction of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 11 'after curing is preferably at least 60%, preferably at least 62%, and particularly preferably at least 65% . If the gel fraction is less than 60%, the cohesive force of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 11 'after curing does not become sufficient and the excellent blister resistance can not be exhibited and the step following property under high temperature and high humidity conditions is also excellent Do not.

The gel fraction of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 11 'after curing is 95% or less, preferably 90% or less, and particularly preferably 80% or less as the upper limit value. If the gel fraction exceeds 95%, the adhesive force of the pressure-sensitive adhesive layer 11 'after curing tends to decrease, and sufficient durability can not be obtained. Here, the method of measuring the gel fraction of the pressure-sensitive adhesive layer 11 'after curing is as shown in the following test examples.

(3) Wet heat resistance

The moisture resistance and whitening whiteness of the pressure-sensitive adhesive according to the present embodiment can be quantitatively evaluated by the haze value as shown below.

That is, the pressure-sensitive adhesive layer 11 is cured by irradiation of an active energy ray in a laminate in which a pressure-sensitive adhesive layer 11 having a thickness of 50 μm is sandwiched between a glass plate and a plastic plate having a thickness of 0.7 mm, The laminate was subjected to a durability test in which the laminate was stored under the moist heat condition of 85 ° C and 85% RH for 1000 hours. Next, when the laminate was stored for 24 hours at normal temperature and normal humidity at 23 ° C and 50% The value obtained by subtracting the haze value before the durability test from the haze value (measured in accordance with JIS K7136: 2000, the same shall apply hereinafter) is preferably less than 1.5, particularly preferably less than 1.2 and more preferably less than 1.0.

The pressure-sensitive adhesive layer 11 was cured by irradiation of an active energy ray in a laminate in which a pressure-sensitive adhesive layer 11 having a thickness of 250 μm was sandwiched between a glass plate and a plastic plate having a thickness of 0.7 mm, The laminate was subjected to a durability test in which the laminate was stored under the moist heat condition of 85 ° C and 85% RH for 1000 hours. Next, when the laminate was stored for 24 hours at normal temperature and normal humidity at 23 ° C and 50% The value obtained by subtracting the haze value before the durability test from the haze value is preferably less than 1.0, particularly preferably less than 0.5, and more preferably less than 0.1.

The pressure-sensitive adhesive layer 11 was cured by irradiation of an active energy ray in a laminate in which a pressure-sensitive adhesive layer 11 having a thickness of 50 μm was sandwiched between a glass plate and a plastic plate having a thickness of 2.0 mm, The laminate was subjected to a durability test in which the laminate was stored under the moist heat condition of 85 ° C and 85% RH for 1000 hours. Next, when the laminate was stored for 24 hours at normal temperature and normal humidity at 23 ° C and 50% The value obtained by subtracting the haze value before the durability test from the haze value is preferably less than 8, particularly preferably less than 6, more preferably less than 5.

The pressure-sensitive adhesive layer 11 was cured by irradiation of an active energy ray in a laminate in which a pressure-sensitive adhesive layer 11 having a thickness of 250 μm was sandwiched between a glass plate and a plastic plate having a thickness of 2.0 mm, The laminate was subjected to a durability test in which the laminate was stored under the moist heat condition of 85 ° C and 85% RH for 1000 hours. Next, when the laminate was stored for 24 hours at normal temperature and normal humidity at 23 ° C and 50% The value obtained by subtracting the haze value before the durability test from the haze value is preferably less than 8, particularly preferably less than 5, more preferably less than 3.

As described above, when the difference in the haze value is in the above range, the increase in the haze value is small even after being placed under the moist heat condition, and the whitening of the pressure-sensitive adhesive can be suppressed. Here, since the plastic plate is relatively easy to permeate moisture under moist heat conditions, in a laminated body in which a glass plate and a plastic plate are sandwiched by a general cured pressure-sensitive adhesive layer, moisture permeates the plastic plate under a moist heat condition, The moisture is likely to reach the post-adhesive layer. Therefore, in such a laminate, the pressure-sensitive adhesive layer after curing tends to be whitened as compared with a laminate in which two pressure-sensitive adhesive layers are sandwiched between two glass plates. However, according to the pressure-sensitive adhesive sheet 1 of the present embodiment, even in the case of the laminate as described above, excellent heat and moisture resistance can be obtained. The test method for the anti-wet heat resistance described above is as shown in the following test examples.

(4) Haze value

In the pressure-sensitive adhesive sheet 1 according to the present embodiment, the pressure-sensitive adhesive layer 11 preferably has a haze value of 5% or less, more preferably 3% or less, particularly preferably 1% or less, desirable. If the haze value of the pressure-sensitive adhesive layer 11 is 5% or less, the transparency is extremely high and is suitable for optical use (for a display). The haze value of the pressure-sensitive adhesive layer 11 does not change even after curing by irradiation with active energy rays. The haze value in this specification is a value measured in accordance with JIS K7136: 2000.

(5) Step follow-up rate

In the pressure-sensitive adhesive sheet 1 according to the present embodiment, the pressure-sensitive adhesive layer 11 'obtained by curing the pressure-sensitive adhesive layer 11 by irradiation of active energy rays has a step following rate (% ) Is preferably 5% or more as the lower limit value, more preferably 10% or more, particularly preferably 15% or more, and more preferably 20% or more. The upper limit value of the step following rate is not particularly limited, but is usually preferably 80% or less, and particularly preferably 70% or less. The test method for the step difference followability is as shown in the following test example.

(%) = {(Height of stepped portion (m) maintained in a state of being filled without bubbling, lifting, peeling or the like after predetermined durability test) / (thickness of pressure-sensitive adhesive layer)} x 100

Since the step following rate of the pressure-sensitive adhesive layer 11 'after curing is in the above-mentioned range, the post-curing pressure-sensitive adhesive layer 11' ), So that bubbles, lifting, peeling, and the like are prevented from being generated in the vicinity of the step, thereby suppressing the occurrence of reflection loss of light. As a result, it becomes possible to manufacture a display having a higher image quality.

(6) Adhesion

When the pressure-sensitive adhesive layer 11 of the pressure-sensitive adhesive sheet 1 according to the present embodiment is cured by irradiation of active energy rays to form the pressure-sensitive adhesive layer 11 'after curing, Is preferably 20 N / 25 mm or more as the lower limit value, particularly preferably 25 N / 25 mm or more, more preferably 30 N / 25 mm or more. When the adhesive force of the adhesive sheet 1 is 20 N / 25 mm or more, the blister resistance is more excellent. On the other hand, the upper limit value of the adhesive force is not particularly limited, but is usually preferably 100 N / 25 mm or less, more preferably 80 N / 25 mm or less, and particularly preferably 60 N / 25 mm or less. The adhesive force is basically the adhesive force measured by the 180 degree peeling technique in accordance with JIS Z0237: 2009, and the specific test method is as shown in the following test example.

2. Composition of adhesive sheet

(1) Pressure-sensitive adhesive layer

The pressure-sensitive adhesive layer 11 is composed of an active energy ray-curable pressure-sensitive adhesive and also has a water vapor permeability of the cured pressure-sensitive adhesive layer 11 'formed by curing the pressure-sensitive adhesive layer 11 by irradiation of active energy rays, Is not particularly limited as long as the gel fraction of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 11 'falls within the above-mentioned respective ranges.

In particular, the pressure-sensitive adhesive layer 11 preferably has a crosslinking structure composed of the (meth) acrylic acid ester polymer (A) and the crosslinking agent (B) and also contains the active energy ray-curable component (C). Such a pressure-sensitive adhesive layer 11 can be obtained, for example, from a pressure-sensitive adhesive composition containing a (meth) acrylic acid ester polymer (A), a crosslinking agent (B) and an active energy ray- (Thermally crosslinking) the pressure-sensitive adhesive layer. It is preferable that the adhesive composition P further contains a photopolymerization initiator (D), if desired. In the present specification, (meth) acrylic acid means both acrylic acid and methacrylic acid. The same is true of other similar terms. The term " polymer " also includes the concept of " copolymer ".

The pressure-sensitive adhesive layer 11 obtained by crosslinking (cross-linking) the above-mentioned pressure-sensitive adhesive composition P is not yet cured by the active energy ray at the stage of the pressure-sensitive adhesive sheet 1, It is possible to relax the stress generated when an object to be adhered to the adherend such as a display body constituting member is knotted. Therefore, even when the pressure sensitive adhesive sheet 1 is stuck to the display body constituting member having a step difference, the pressure sensitive adhesive layer 11 is easy to follow the step, and occurrence of gaps, lifting and the like in the vicinity of the step is suppressed.

When the pressure-sensitive adhesive sheet 1 is used, one pressure-sensitive adhesive layer 11 is used to apply pressure to one display element constituting member and another display element constituting member, And the active energy ray is irradiated to the pressure-sensitive adhesive layer (11). As a result, the active energy ray-curable component (C) is cured and the pressure-sensitive adhesive layer (11) becomes the pressure-sensitive adhesive layer (11 ') after curing. Since the pressure-sensitive adhesive layer 11 'after curing has an increased gel fraction and a high cohesive strength due to curing, the obtained laminate (display body) is subjected to heat treatment under high temperature and high humidity conditions, for example, under conditions of 85 ° C and 85% RH It is possible to suppress the occurrence of bubbles, lifting, peeling, and the like in the vicinity of the interface between the adhesive layer 11 'and the display body constituting member after the curing and the step. That is, the post-curing pressure-sensitive adhesive layer 11 'obtained by crosslinking and curing the above-mentioned pressure-sensitive adhesive composition P is superior in blister resistance under high temperature and high humidity conditions and excellent in step traceability under high temperature and high humidity conditions.

(1-1) Synthesis of (meth) acrylic acid ester polymer (A)

The (meth) acrylic acid ester polymer (A) is not particularly limited as long as the above-mentioned water vapor permeability and gel fraction of the obtained post-curing pressure-sensitive adhesive layer 11 ' , And a monomer (hydroxyl group-containing monomer) having a hydroxyl group in the molecule as the monomer unit constituting the polymer. Particularly, the (meth) acrylic acid ester polymer (A) preferably contains 20 mass% or more of the hydroxyl group-containing monomer as the monomer unit constituting the polymer, particularly preferably 23 mass% % Or more.

(Crosslinking) the adhesive composition P when the (meth) acrylic acid ester polymer (A) contains the hydroxyl group-containing monomer as the constituent monomer unit in the above-mentioned amount, the (meth) acrylic acid ester polymer The hydroxyl group derived from the hydroxyl group-containing monomer reacts with the reactive functional group of the crosslinking agent (B) to form a three-dimensional network structure as a crosslinked structure. As a result, the resulting pressure-sensitive adhesive has a high cohesive force, and is excellent in stepwise followability under the conditions of blister resistance and high temperature and high humidity. In addition, when the (meth) acrylic acid ester polymer (A) contains the hydroxyl group-containing monomer in the above-described amount, the glass transition temperature (Tg) of the (meth) acrylic acid ester polymer (A) becomes relatively high. As a result, the cohesive force of the pressure-sensitive adhesive constituting the obtained post-curing pressure-sensitive adhesive layer 11 'is favorable, and the step followability under the conditions of blister resistance and high temperature and high humidity becomes more excellent. If the hydroxyl group is a hydrophilic group and such a hydrophilic group is present in the pressure-sensitive adhesive layer 11 'after the curing in the above-described amount, even if the pressure-sensitive adhesive layer 11' after the curing is placed under high temperature and high humidity conditions, Is highly compatible with the moisture penetrated into the pressure-sensitive adhesive layer 11 'after curing, and the moisture can easily move in the pressure-sensitive adhesive layer 11' after curing. As a result, when it is put back under the high-temperature and high-humidity conditions and returned to the normal temperature and normal humidity, it is estimated that the moisture tends to be released from the cured pressure-sensitive adhesive layer 11 ', and in the cured pressure- So that condensation hardly occurs and the whitening of the pressure-sensitive adhesive layer 11 'after curing is suppressed. That is, the post-curing pressure-sensitive adhesive layer 11 'has better anti-wet heat resistance. Further, the (meth) acrylic acid ester polymer (A) containing the hydroxyl group-containing monomer as the constituent monomer unit in the above-mentioned amount has good compatibility with the active energy ray curable component (C). As a result, The transparency of the transparent substrate 11 'also improves.

Examples of the hydroxyl group-containing monomer include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (Meth) acrylate such as 3-hydroxybutyl (meth) acrylate and 4-hydroxybutyl (meth) acrylate. Among them, 2-hydroxyethyl (meth) acrylate and 4-hydroxybutyl (meth) acrylate are preferable from the viewpoints of blister resistance and anti-wet heat whitening and step following property under high temperature and high humidity conditions and transparency, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate or 4-hydroxybutyl acrylate is preferable. These may be used alone or in combination of two or more.

The (meth) acrylic acid ester polymer (A) preferably contains 60 mass% or less of the hydroxyl group-containing monomer as the monomer unit constituting the polymer, more preferably 58 mass% or less, Particularly preferably 55 mass% or less, and more preferably 50 mass% or less. When the (meth) acrylic acid ester polymer (A) contains 60 mass% or less of the hydroxyl group-containing monomer, the content of the monomer other than the hydroxyl group-containing monomer can be sufficiently ensured, and the resulting pressure-sensitive adhesive becomes more excellent in adhesiveness.

The (meth) acrylic acid ester polymer (A) preferably contains a (meth) acrylic acid alkyl ester as a monomer unit constituting the polymer. As a result, good tackiness can be exhibited. The alkyl group may be linear or branched or may have a cyclic structure.

As the (meth) acrylic acid alkyl ester, a (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms in the alkyl group is preferable from the viewpoint of adhesiveness. Examples of the (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms in the alkyl group include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, n-butyl (meth) acrylate, n-pentyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl Stearyl (meth) acrylate, palmityl (meth) acrylate, stearyl (meth) acrylate, cyclohexyl (meth) acrylate, isobornyl (meth) acrylate and adamantyl (meth) acrylate. These may be used alone or in combination of two or more.

Among the above-mentioned (meth) acrylic acid alkyl esters, (meth) acrylic acid alkyl esters having 4 to 20 carbon atoms in the alkyl group are preferable from the viewpoint of anti-wet heat resistance and blister resistance. Examples of the (meth) acrylic acid alkyl ester having 4 to 20 carbon atoms in the alkyl group include n-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, isobornyl N-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate and isobornyl (meth) acrylate are particularly preferred because of their excellent tackiness and blister resistance.

The (meth) acrylic acid ester polymer (A) preferably contains 30 mass% or more of (meth) acrylic acid alkyl ester as a monomer unit constituting the polymer, more preferably 35 mass% or more, and more preferably 45 mass% By mass or more, particularly preferably 55% by mass or more. When the (meth) acrylic acid alkyl ester is contained in an amount of 30 mass% or more, the (meth) acrylic acid ester polymer (A) can exhibit favorable tackiness. The (meth) acrylic acid ester polymer (A) preferably contains 90 mass% or less of (meth) acrylic acid alkyl ester as the monomer unit constituting the polymer, particularly preferably 85 mass% And more preferably 80 mass% or less. By making the amount of the (meth) acrylic acid alkyl ester 90% by mass or less, it is possible to introduce other monomer components into the (meth) acrylic acid ester polymer (A).

When a (meth) acrylic acid alkyl ester having 4 to 20 carbon atoms in the alkyl group is included, the content of the (meth) acrylic acid alkyl ester in the alkyl group of the alkyl group of the alkyl group is 1 to 20, The content of the alkyl acrylate is preferably 50% by mass or more, more preferably 70% by mass or more, and further preferably 85% by mass or more. Thereby, an effect of good tackiness and blister resistance can be obtained. On the other hand, the upper limit of the content ratio of (meth) acrylic acid alkyl ester having 4 to 20 carbon atoms in the alkyl group in the (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms in the alkyl group is not particularly limited, do.

A monomer (hard monomer) having a glass transition temperature (Tg) of 0 占 폚 or more as a homopolymer and a monomer (soft monomer) having a glass transition temperature (Tg) of 0 占 폚 or less as a homopolymer may be used as the alkyl (meth) It is also preferable to use them in combination. This is because it is possible to improve the blister resistance and the step-wise followability by improving the cohesive force with a hard monomer while securing tackiness and flexibility by the soft monomer. In this case, the mass ratio of the hard monomer to the soft monomer is preferably 5:95 to 40:60, and particularly preferably 15:85 to 30:70.

The glass transition temperature (Tg) of the hard monomer as the homopolymer is preferably 40 占 폚 or higher, more preferably 60 占 폚 or higher, and even more preferably 80 占 폚 or higher. The glass transition temperature (Tg) is preferably 300 占 폚 or lower, more preferably 200 占 폚 or lower, and even more preferably 130 占 폚 or lower.

Examples of the hard monomer include methyl acrylate (Tg 10 ° C), methyl methacrylate (Tg 105 ° C), isobornyl acrylate (Tg 94 ° C), isobornyl methacrylate (Tg 180 ° C) Adamantyl (Tg 115 ° C), adamantyl methacrylate (Tg 141 ° C), and the like. These may be used alone or in combination of two or more.

Of these hard monomers, methyl acrylate, methyl methacrylate and isobornyl acrylate are preferable from the viewpoint of exhibiting the performance of the hard monomer while preventing adverse effects on other properties such as adhesiveness and transparency.

The glass transition temperature (Tg) of the soft monomer as the homopolymer is preferably -20 占 폚 or lower, more preferably -40 占 폚 or lower, and even more preferably -60 占 폚 or lower. The glass transition temperature (Tg) is preferably -100 DEG C or higher, particularly preferably -90 DEG C or higher, and more preferably -80 DEG C or higher.

As the soft monomer, an alkyl acrylate having a straight chain or branched alkyl group having 2 to 12 carbon atoms is preferably used. For example, 2-ethylhexyl acrylate (Tg-70 캜) and n-butyl acrylate (Tg -54 캜). From the viewpoint of adhesiveness, 2-ethylhexyl acrylate (Tg -70 캜) Do. These may be used alone or in combination of two or more.

As the (meth) acrylic acid alkyl ester, at least a part of the alkyl (meth) acrylic acid ester is preferably a monomer having an alicyclic structure (an alicyclic structure-containing monomer) as the alkyl group. Since the alicyclic structure-containing monomer is bulky, it is presumed that the presence of the alicyclic structure in the polymer broadens the intervals between the polymers, and the obtained pressure-sensitive adhesive can be made excellent in flexibility. As a result, the pressure sensitive adhesive is more excellent in step following property.

The carbon ring of the alicyclic structure in the alicyclic structure-containing monomer may have a saturated structure or may have an unsaturated bond in a part thereof. The alicyclic structure may be a monocyclic alicyclic structure or a polycyclic alicyclic structure such as a bicyclic or tricyclic ring. The alicyclic structure preferably has a polycyclic alicyclic structure (polycyclic structure) from the viewpoint of making the distance between the obtained (meth) acrylic acid ester polymer (A) appropriate and giving higher stress relaxation property to the pressure- Do. In consideration of the compatibility of the (meth) acrylic acid ester polymer (A) with other components, the polycyclic structure is particularly preferably a bicyclic to tetracyclic ring. From the viewpoint of imparting stress relaxation property as described above, the number of carbon atoms in the alicyclic structure (the total number of carbon atoms in the part forming the ring, when plural rings are present independently, refers to the total number of carbon atoms) , Usually 5 or more, and particularly preferably 7 or more. On the other hand, the upper limit of the carbon number of 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, dicyclo (Dicyclopentanyl (meth) acrylate), dicyclopentenyl (meth) acrylate, and the like. Of these, dicyclopentanyl (meth) acrylate is preferred because of its excellent blister resistance and superior step- (The number of carbon atoms of the alicyclic structure is 10) or isobornyl (meth) acrylate (the number of carbon atoms of the alicyclic structure is preferably 7), and the isobornyl (meth) acrylate Is particularly preferable. These may be used singly or in combination of two or more kinds.

When the (meth) acrylic acid ester polymer (A) contains an alicyclic structure-containing monomer as a constituent monomer unit, the proportion of the alicyclic structure-containing monomer in the (meth) acrylic acid alkyl ester having 1 to 20 carbon atoms in the alkyl group, More preferably 1% by mass or more, particularly preferably 5% by mass or more, and more preferably 10% by mass or more. The proportion of the alicyclic structure-containing monomer is preferably 50 mass% or less, particularly preferably 40 mass% or less, and more preferably 30 mass% or less. When the content of the alicyclic structure-containing monomer is within the above-mentioned range, excellent adhesion to the transparent conductive film and plastic can be sufficiently exhibited, as well as excellent step-wise followability of the resulting pressure-sensitive adhesive.

The (meth) acrylic acid ester polymer (A) may contain a monomer having a reactive functional group other than the above-mentioned hydroxyl group-containing monomer as a monomer unit constituting the polymer. Examples of such a reactive functional group-containing monomer include a monomer having a carboxyl group in the molecule (a carboxyl group-containing monomer) and a monomer having an amino group in the molecule (an amino group-containing monomer).

Examples of the carboxyl group-containing monomer include ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid and citraconic acid. These may be used alone or in combination of two or more.

Examples of the amino group-containing monomer include aminoethyl (meth) acrylate, n-butylaminoethyl (meth) acrylate, monomethylaminoethyl (meth) acrylate, monoethylaminoethyl (meth) acrylate, monomethyl Aminopropyl, monoethylaminopropyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, and the like. These may be used alone or in combination of two or more.

On the other hand, it is also preferable that the (meth) acrylic acid ester polymer (A) does not contain a monomer containing a carboxyl group as a monomer unit constituting the polymer. Since the carboxyl group is an acid component, it is preferable that a transparent substrate such as a transparent conductive film such as tin-doped indium oxide (ITO) or a metal film (Corrosion, change in resistance value, and the like) due to acid can be suppressed even in the presence of an acid.

Here, the expression " not containing a carboxyl group-containing monomer " means that the monomer does not substantially contain a carboxyl group-containing monomer, and includes not only a carboxyl group-containing monomer but also a carboxyl group- Containing monomer to such an extent that corrosion does not occur. Concretely, a monomer containing a carboxyl group-containing monomer in an amount of 0.1% by mass or less, preferably 0.01% by mass or less, more preferably 0.001% by mass or less, as a monomer unit in the (meth) acrylic acid ester polymer (A) .

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 presenting the nitrogen atom-containing monomer as a constituent unit in the polymer, a predetermined polarity is given to the pressure-sensitive adhesive, and an adherend having a certain polarity such as glass can be made excellent in affinity. Examples of the nitrogen atom-containing monomer include monomers having an amide group and monomers having a nitrogen-containing heterocyclic ring in addition to the amino group-containing monomers as the above-mentioned reactive functional group-containing monomers. Among them, (meth) acrylic acid ester polymer From the viewpoint of obtaining appropriate rigidity, monomers having a nitrogen-containing heterocyclic ring are preferable.

Examples of the monomer having a nitrogen-containing heterocyclic ring include N- (meth) acryloylmorpholine, N- vinyl-2-pyrrolidone, N- (meth) acryloylpyrrolidone, N- Acryloylpyridine, N- (meth) acryloylpyrrolidine, N- (meth) acryloyl aziridine, aziridinyl ethyl (meth) acrylate, 2- vinylpyridine, 4- Vinyl pyrazine, 1-vinylimidazole, N-vinylcarbazole, N-vinylphthalimide and the like. Of these, N- (meth) acryloylmorpholine exhibiting more excellent adhesion is preferable , N-acryloylmorpholine are particularly preferred.

Examples of the nitrogen atom-containing monomer include N-vinylcarboxylic acid amide, (meth) acrylamide, N-methyl (meth) acrylamide, N-methylol (meth) acrylamide, N-tert- (Meth) acrylamide, N, N-dimethyl (meth) acrylamide, N, N-ethyl (Meth) acrylamide, dimethylaminopropyl (meth) acrylamide, N-vinylcaprolactam and the like may be used.

These nitrogen atom-containing monomers may be used singly or in combination of two or more species.

When the (meth) acrylic acid ester polymer (A) contains a nitrogen atom-containing monomer as the monomer unit constituting the polymer, it preferably contains the nitrogen atom-containing monomer in an amount of 0.5 mass% or more, more preferably 1 mass% And particularly preferably 3% by mass or more. The (meth) acrylic acid ester polymer (A) preferably contains 20 mass% or less of the nitrogen atom-containing monomer as the monomer unit constituting the polymer, particularly preferably 15 mass% or less. By mass or less. When the content of the nitrogen atom-containing monomer is within the above-mentioned range, the resulting pressure-sensitive adhesive can effectively exert excellent tackiness on an adherend such as glass.

The (meth) acrylic acid ester polymer (A) may contain other monomers as monomer units constituting the polymer, if desired. Examples of other 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. By virtue of the linear polymer, entanglement of the molecular chains is apt to occur, and cohesive force can be expected to be improved, so that a pressure-sensitive adhesive excellent in blister resistance can be obtained.

The (meth) acrylic acid ester polymer (A) is preferably a solution polymer obtained by a solution polymerization method. As a solution polymer, a polymer having a high molecular weight is easily obtained and an improvement in cohesive force can be expected, so that a pressure-sensitive adhesive excellent in blister resistance can be obtained.

The polymerization 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 as the lower limit value, particularly preferably 300,000 or more, more preferably 400,000 or more. If the lower limit of the weight-average molecular weight of the (meth) acrylic acid ester polymer (A) is higher than the above-mentioned range, the resultant pressure-sensitive adhesive has better blister resistance.

The upper limit of the weight average molecular weight of the (meth) acrylic acid ester polymer (A) is preferably not more than 2,000,000, particularly preferably not more than 1.5 million, more preferably not more than 1,000,000. When the upper limit of the weight-average molecular weight of the (meth) acrylic acid ester polymer (A) is not more than the above value, the resulting pressure sensitive adhesive exhibits better step traceability. In the present specification, the weight average molecular weight is a value in terms of standard polystyrene measured by a gel permeation chromatography (GPC) method.

The glass transition temperature (Tg) of the (meth) acrylic acid ester polymer (A) is preferably -100 占 폚 or higher as the lower limit value, particularly preferably -80 占 폚 or higher, and more preferably -60 占 폚 or higher. The upper limit value is preferably 0 deg. C or lower, particularly preferably -5 deg. C or lower, and more preferably -10 deg. C or lower. When the glass transition temperature (Tg) of the (meth) acrylic acid ester polymer (A) is in the above-mentioned range, the resulting pressure-sensitive adhesive has satisfactory cohesion and flexibility and has sufficient cohesive strength and exhibits excellent blister resistance and step- .

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

The content of the (meth) acrylic acid ester polymer (A) in the sticky composition P according to the present embodiment is preferably 50% by mass or more, particularly preferably 60% by mass or more as the lower limit value, more preferably 70% desirable. With the lower limit of the content of the (meth) acrylic acid ester polymer (A), the resulting pressure-sensitive adhesive effectively achieves favorable tackiness and has excellent anti-wet heat resistance. The upper limit of the content of the (meth) acrylic acid ester polymer (A) is preferably 99% by mass or less, particularly preferably 97% by mass or less, and more preferably 96% by mass or less. The content of other components such as the crosslinking agent (B) and the active energy ray-curable component (C) is secured by the above-mentioned upper limit value of the content of the (meth) acrylic acid ester polymer (A) And the step following property under the conditions of blister resistance and high temperature and high humidity is more excellent.

(1-2) Crosslinking agent (B)

The cross-linking agent (B) can crosslink the (meth) acrylic acid ester polymer (A) by heating the adhesive composition P to favorably form a three-dimensional network structure. As a result, the cohesive force of the resulting pressure-sensitive adhesive is further improved, and the blister resistance and step-following ability at high temperature and high humidity conditions are further improved.

The crosslinking agent (B) is not particularly limited as long as it can react with the reactive functional group possessed by the (meth) acrylic acid ester polymer (A). Examples thereof include isocyanate crosslinking agents, epoxy crosslinking agents, amine crosslinking agents, melamine crosslinking agents, aziridine crosslinking agents, Hydrazine type crosslinking agents, aldehyde type crosslinking agents, oxazoline type crosslinking agents, metal alkoxide type crosslinking agents, metal chelate type crosslinking agents, metal salt type crosslinking agents and ammonium salt type crosslinking agents. As described above, since the (meth) acrylic acid ester polymer (A) preferably contains a hydroxyl group-containing monomer as a constituent monomer unit, an isocyanate crosslinking agent excellent in reactivity with a hydroxyl group is used as the crosslinking agent (B) . The crosslinking agent (B) may be used alone or in combination of two or more.

The isocyanate crosslinking agent includes 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 diisocyanate, hydrogenated diphenylmethane di An alicyclic polyisocyanate such as isocyanate and the like, and an adduct which is a reaction product of a burette, isocyanurate and a low molecular active hydrogen-containing compound such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylol propane, And the like. Of these, from the viewpoint of reactivity with a hydroxyl group, trimethylolpropane-modified aromatic polyisocyanate, trimethylolpropane-modified tolylene diisocyanate and trimethylolpropane-modified xylylene diisocyanate are particularly preferable.

The content of the crosslinking agent (B) in the adhesive composition P is preferably 0.01 parts by mass or more, particularly preferably 0.05 parts by mass or more, and more preferably 0.1 parts by mass or more per 100 parts by mass of the (meth) acrylic acid ester polymer (A) Is more preferable. The content is preferably 3 parts by mass or less, particularly preferably 2 parts by mass or less, more preferably 1 part by mass or less. When the content of the cross-linking agent (B) is in the above-mentioned range, the degree of cross-linking becomes appropriate, so that the obtained pressure-sensitive adhesive becomes more resistant to blistering and step traceability under high temperature and high humidity conditions.

(1-3) Active energy ray-curable component (C)

The pressure-sensitive adhesive obtained by crosslinking (cross-linking) the pressure-sensitive adhesive composition P by the pressure-sensitive adhesive composition P containing the active energy ray-curable component (C) becomes a pressure- This pressure sensitive adhesive is obtained by curing the active energy ray curable component (C) with each other by curing by irradiation with active energy rays after the adherend is attached, and the polymerized active energy ray curable component (C) It is presumed to be entangled with the crosslinked structure (three-dimensional network structure) of A). Such a pressure-sensitive adhesive having a higher-order structure has a higher cohesive strength and exhibits a higher film strength, resulting in better blister resistance and better step-wise followability under high-temperature and high-humidity conditions.

The active energy ray-curable component (C) is not particularly limited as long as it is cured by irradiation with an active energy ray and is capable of obtaining the above effect, and may be any of monomers, oligomers or polymers, or a mixture thereof. Among them, polyfunctional acrylate-based monomers excellent in compatibility with the (meth) acrylic acid ester polymer (A) and the like are preferable.

Examples of polyfunctional acrylate monomers include 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, polyethylene glycol di (Meth) acrylate, neopentyl glycol adipate di (meth) acrylate, hydroxypivalic neopentyl glycol di (meth) acrylate, dicyclopentanyl di (meth) acrylate, caprolactone modified dicyclopentenyl Di (acryloxyethyl) isocyanurate, allyl cyclohexyl di (meth) acrylate, ethoxylated bisphenol A diacrylate, 9,9-di (meth) acrylate, Bifunctional types such as bis [4- (2-acryloyloxyethoxy) phenyl] fluorene; (Meth) acrylate such as trimethylolpropane tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, propionic acid modified dipentaerythritol tri (meth) acrylate, pentaerythritol tri Trifunctional types such as tri (meth) acrylate, tris (acryloxyethyl) isocyanurate, and? -Caprolactone modified tris- (2- (meth) acryloxyethyl) isocyanurate; Tetrafunctional types such as diglycerin tetra (meth) acrylate and pentaerythritol tetra (meth) acrylate; Pentafunctional type such as propionic acid-modified dipentaerythritol penta (meth) acrylate; And hexafunctional types such as dipentaerythritol hexa (meth) acrylate and caprolactone-modified dipentaerythritol hexa (meth) acrylate. Among the above, from the viewpoints of blister resistance of the obtained pressure-sensitive adhesive and step traceability under high-temperature and high-humidity conditions, it is preferred to use di (acryloxyethyl) isocyanurate, tris (acryloxyethyl) isocyanurate, ε-caprolactone- - (2- (meth) acryloxyethyl) isocyanurate and the like are preferable, and a polyfunctional acrylate monomer containing an isocyanurate structure in the molecule is preferable, and a trifunctional or more functional isocyanurate structure Is more preferable, and ε-caprolactone-modified tris- (2- (meth) acryloxyethyl) isocyanurate is particularly preferable. These may be used singly or in combination of two or more kinds. From the viewpoint of compatibility with the (meth) acrylic acid ester polymer (A), the polyfunctional acrylate monomer preferably has a molecular weight of less than 1,000.

As the active energy ray-curable component (C), an active energy ray-curable acrylate oligomer may be used. Examples of such acrylate oligomers include polyester acrylate, epoxy acrylate, urethane acrylate, polyether acrylate, polybutadiene acrylate, and silicone acrylate.

The weight average molecular weight of the acrylate oligomer is preferably 50,000 or less, more preferably 1,000 to 50,000, and even more preferably 3,000 to 40,000. These acrylate oligomers may be used singly or in combination of two or more.

As the active energy ray curable component (C), an acryl acrylate polymer having a group having a (meth) acryloyl group introduced into its side chain may also be used. Such an acryl acrylate polymer may be obtained by copolymerizing a (meth) acrylic acid ester with a monomer having a crosslinkable functional group in the molecule and adding a (meth) acryloyl group to a part of the crosslinkable functional group of the copolymer And a compound having a group capable of reacting with a crosslinkable functional group.

The weight average molecular weight of the adduct acrylate-based polymer is preferably from 50,000 to 900,000, and particularly preferably from 100,000 to 500,000.

The active energy ray-curable component (C) may be selected from among the above-mentioned polyfunctional acrylate-based monomer, acrylate-based oligomer and adduct acrylate-based polymer, or a combination of two or more thereof And may be used in combination with other active energy ray curable components.

The content of the active energy ray-curable component (C) in the sticky composition P is preferably from 0.01 to 10 parts by weight, based on the total weight of the pressure-sensitive adhesive composition, from the viewpoint of improving the cohesive force of the obtained pressure-sensitive adhesive and excellent step- A) is preferably 1 part by mass or more, more preferably 3 parts by mass or more, and particularly preferably 5 parts by mass or more, as a lower limit value with respect to 100 parts by mass of A). On the other hand, from the viewpoint of preventing phase separation of the active energy ray-curable component (C) from the (meth) acrylic acid ester polymer (A), the content is preferably 50 parts by mass or less, more preferably 20 parts by mass or less And further preferably 10 parts by mass or less, from the viewpoint of better initial step following property.

(1-4) Photopolymerization initiator (D)

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

Examples of such a photopolymerization initiator (D) include benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethyl 2-methyl-1-phenylpropan-1-one, 1- Methyl-1- [4- (methylthio) phenyl] -2-morpholino-propan-1-one, 4- (2-hydroxyethoxy) Hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4'-diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2- 2-methylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyldimethylketal, acetylthioxanthone, Phenon dimethyl ketal, p-dimethylamino (2-hydroxy-2-methyl-1 [4- (1-methylvinyl) phenyl] propanone], 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide . These may be used alone or in combination of two or more.

The content of the photopolymerization initiator (D) in the adhesive composition P is preferably 0.1 part by mass or more, more preferably 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 (C). The upper limit value is preferably 30 parts by mass or less, particularly preferably 15 parts by mass or less.

(1-5) Various additives

The pressure-sensitive adhesive composition P may optionally contain additives such as a silane coupling agent, an ultraviolet absorber, an antistatic agent, a tackifier, an antioxidant, a light stabilizer, a softening agent, a filler, a refractive index adjuster and the like which are commonly used in acrylic pressure- can do. It is also assumed that the polymerization solvent or diluting solvent to be described later is not included in the additive constituting the adhesive composition P.

Here, when the adhesive composition P contains a silane coupling agent, the resulting pressure-sensitive adhesive improves adhesion with the glass member or the plastic plate. As a result, the obtained pressure-sensitive adhesive becomes better in blister resistance.

As the silane coupling agent, an organosilicon compound having at least one alkoxysilyl group in the molecule is preferred because it has good compatibility with the (meth) acrylic acid ester polymer (A) and has optical transparency.

Examples of such a silane coupling agent include a polymerizable unsaturated group-containing silicon compound such as vinyltrimethoxysilane, vinyltriethoxysilane, and methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane , Silicon compounds having an epoxy structure such as 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-mercaptopropyltriethoxysilane, 3-mercapto (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -methyltrimethoxysilane and the like, Amino group-containing silicon compounds such as 3-aminopropylmethyldimethoxysilane, 3-chloropropyltrimethoxysilane, 3-isocyanatepropyltriethoxysilane, or at least one of them and methyltriethoxysilane, ethyltriethoxy Silane, methyltrimethoxy And condensation products with an alkyl group-containing silicon compound such as silane or ethyltrimethoxysilane. These may be used singly or in combination of two or more kinds.

When the sticky composition P contains a silane coupling agent, the content thereof is preferably 0.01 parts by mass or more, particularly preferably 0.05 parts by mass or more, and more preferably 0.1 parts by mass or more per 100 parts by mass of the (meth) acrylic acid ester polymer (A) Or more. The content thereof is preferably 2 parts by mass or less, particularly preferably 1 part by mass or less, more preferably 0.5 parts by mass or less.

(1-6) Preparation of sticky composition

The sticky composition P is obtained by preparing a (meth) acrylic acid ester polymer (A), and mixing the resulting (meth) acrylic acid ester polymer (A) and, if desired, a crosslinking agent (B), an active energy ray- , A photopolymerization initiator (D), and an additive.

The (meth) acrylic acid ester polymer (A) can be produced by polymerizing a mixture of monomers constituting the polymer by a conventional 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. As the polymerization solvent, for example, ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone and the like may be used.

Examples of the polymerization initiator include an azo compound, an organic peroxide, and the like, and two or more types may be used in combination. Examples of the azo compound include azo compounds such as 2,2'-azobisisobutyronitrile, 2,2'-azobis (2-methylbutyronitrile), 1,1'-azobis (cyclohexane 1-carbonyl Azobis (2,4-dimethyl-4-methoxy valeronitrile), 2,2'-azobis (2,4-dimethylvaleronitrile) Azobis (2-methylpropionate), 4,4'-azobis (4-cyanovaleric acid), 2,2'-azobis (2-hydroxymethylpropionitrile) Azobis [2- (2-imidazolin-2-yl) propane] and the like.

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

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

(B), an active energy ray-curable component (C), a photopolymerization initiator (D), and a photopolymerization initiator (B) are added to a solution of the (meth) acrylic acid ester polymer An additive, and a diluting solvent are added and sufficiently mixed to obtain a sticky composition P (coating solution) diluted with a solvent. When any one of the above-mentioned components is used in the form of a solid or when precipitation occurs when it is mixed with other components in a non-diluted state, the component may be dissolved or dispersed in a diluting solvent After dilution, it may be 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, alcohols such as methanol, ethanol, propanol, Propanol and the like; 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 Is used.

The concentration and viscosity of the coating solution thus prepared are not particularly limited and may be appropriately selected according to the circumstances. For example, it is diluted such that the concentration of the sticky composition P is 10 to 60 mass%. Addition of a diluting solvent is not a necessary condition for obtaining a coating solution, and a diluting solvent may not be added if the viscosity of the adhesive composition P is such as to be a coating. In this case, the adhesive composition P is a coating solution containing a polymerization solvent of the (meth) acrylic acid ester polymer (A) as it is as a diluting solvent.

(1-7) Thickness of the pressure-sensitive adhesive layer

The thickness of the pressure-sensitive adhesive layer 11 (measured in accordance with JIS K7130) in the pressure-sensitive adhesive sheet 1 according to the present embodiment is preferably 10 占 퐉 or more as the lower limit value, more preferably 50 占 퐉 or more, Mu] m or more. If the lower limit value of the thickness of the pressure-sensitive adhesive layer 11 is the above-mentioned upper surface, the anti-wet heat resistance can be further improved, the desired adhesive force can be easily exerted, and satisfactory step traceability with respect to the normal step of the display member constituting member have.

The upper limit of the thickness of the pressure-sensitive adhesive layer 11 is preferably 1000 占 퐉 or less, more preferably 800 占 퐉 or less, particularly preferably 500 占 퐉 or less, and most preferably 300 占 퐉 or less. If the upper limit of the thickness of the pressure-sensitive adhesive layer 11 is above, excellent blister resistance is likely to be exhibited. The pressure-sensitive adhesive layer 11 may be formed as a single layer, or may be formed by laminating a plurality of layers.

(2) Peeling sheet

The release sheets 12a and 12b protect the pressure-sensitive adhesive layer 11 by the use of the pressure-sensitive adhesive sheet 1 and are peeled off when the pressure-sensitive adhesive sheet 1 (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 necessarily required.

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

It is preferable that a peeling treatment is performed on the peeling surface of the peeling sheets 12a and 12b (in particular, the surface in contact with the peeling layer 11). Examples of the releasing agent used in the peeling treatment include alkyd-based, silicone-based, fluorine-based, unsaturated polyester-based, polyolefin-based, and wax-based releasing agents. It is also preferable that one of the release sheets 12a and 12b is a heavy-duty release sheet having a large stripping force and the other release sheet is a light-leakage release sheet having a small stripping force.

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

3. Production of adhesive sheet

As one production example of the adhesive sheet 1, the application solution of the adhesive composition P is applied to the release surface of one release sheet 12a (or 12b) and heat treatment is performed to thermally crosslink the adhesive composition P, After the layer is formed, the peeling surface of the other peeling sheet 12b (or 12a) is superposed on the coated layer. When the curing period is required, the curing period is set so that the coating layer becomes the pressure-sensitive adhesive layer 11 when the curing period is unnecessary. Thus, the pressure-sensitive adhesive sheet (1) is obtained.

The heating temperature of the heat treatment is preferably 50 to 150 占 폚, particularly preferably 70 to 120 占 폚. The heating time is preferably 10 seconds to 10 minutes, particularly preferably 50 seconds to 2 minutes. In addition, the heat treatment can also serve as a drying treatment for volatilizing a diluting solvent or the like from a coated film of the sticky composition P applied to a desired object.

After the heat treatment, a curing period of about 1 to 2 weeks may be provided at room temperature (for example, at 23 DEG C and 50% RH), if necessary. When the curing period is necessary, after the curing period, if the curing period is unnecessary, the pressure-sensitive adhesive layer 11 is formed after the heat treatment is finished.

As another production example of the adhesive sheet 1, a coating solution of the adhesive composition P is applied to the release surface of one release sheet 12a and heat-treated to thermally crosslink the adhesive composition P to form a coating layer , A release sheet 12a with a coating layer is obtained. The application solution of the adhesive composition P is applied to the release surface of the other release sheet 12b and heat-treated to thermally crosslink the adhesive composition P to form a release layer, (12b). Then, the peeling sheet 12a with a coating layer and the peeling sheet 12b with a coating layer are bonded so that both coating layers are in contact with each other. When the curing period is required, the curing period is provided, and when the curing period is unnecessary, the above-mentioned laminated coating layer becomes the pressure-sensitive adhesive layer (11). Thus, the pressure-sensitive adhesive sheet (1) is obtained. According to this manufacturing method, even if the pressure-sensitive adhesive layer 11 is thick, it can be manufactured stably.

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

[Display]

As shown in Fig. 2, the display body 2 according to the present embodiment includes a first display body constituting member 21 (one display body constituting member) having at least a step on the side to be conjugated, A pressure-sensitive adhesive layer 11 (a second pressure-sensitive adhesive layer) is disposed between the display body constituting member 22 (another display body constituting member) and the first display body constituting member 21 and the second display body constituting member 22, '). In the display body 2 according to this embodiment, the first display body constituting member 21 has a step on the surface of the pressure-sensitive adhesive layer 11 'side or the side of the pressure-sensitive adhesive layer 11 side after curing, Has a stepped portion formed by the printed layer 3.

The cured pressure-sensitive adhesive layer 11 'of the display body 2 is obtained by curing the above-described pressure-sensitive adhesive layer 11 of the pressure-sensitive adhesive sheet 1 by energy ray irradiation. In this specification, the post-curing pressure-sensitive adhesive layer 11 'refers to the pressure-sensitive adhesive layer 11 completely cured, in particular, the pressure-sensitive adhesive layer 11' after curing, Means that the rate of increase of the gel fraction of the pressure-sensitive adhesive layer 11 'after curing is 10% or less, and in particular, the rate of increase is 5% or less. The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 11 'after the curing has a crosslinked structure composed of the (meth) acrylic acid ester polymer (A) and the crosslinking agent (B) (D) and an additive, if desired, in addition to the photopolymerization initiator (D). In this case, it is presumed that the polymerized energy ray-curable component (C) is entangled with a crosslinked structure composed of the (meth) acrylic acid ester polymer (A) and the heat crosslinking agent (B) to form a higher order structure.

The photopolymerization initiator (D) contained in the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer (11 ') after the curing has remained without being cleaved by energy ray irradiation, as well as the photopolymerization initiator (D) contained in the pressure- . Therefore, the content thereof is not large, and is usually 0.00001 mass% or more and 0.1 mass% or less, preferably 0.0001 mass% or more and 0.01 mass% or less in the pressure-sensitive adhesive.

In the display body 2 according to the present embodiment, at least one of the first display body constituting member 21 and the second display body constituting member 22 is formed of a plastic plate. Here, the plastic plate is usually susceptible to permeation of water when it is placed under the conditions of high temperature and high humidity, for example, under the conditions of 85 ° C and 85% RH for 72 hours, and the pressure-sensitive adhesive layer 11 ') Is likely to occur. However, even if the display body 2 according to the present embodiment is provided with such a plastic plate, since the cured pressure-sensitive adhesive layer 11 'is derived from the pressure-sensitive adhesive sheet 1 according to the present embodiment , And the whitening of the pressure-sensitive adhesive layer 11 'after curing can be satisfactorily suppressed.

The plastic plate is not particularly limited, and examples thereof include a polycarbonate resin plate and an acrylic resin 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, particularly preferably 0.6 to 2.5 mm, and more preferably 1.5 to 2.1 mm. The above-mentioned polycarbonate resin plate may contain a resin other than a polycarbonate resin as a constituent material thereof, and the above-mentioned acrylic resin plate may contain a resin other than an acrylic resin do.

When at least one of the first display body constituting member 21 and the second display body constituting member 22 is made of a material easily permeable to water vapor, the thicker the constituent member made of the material becomes, It has been confirmed by the present inventors that the degree of whitening of the pressure-sensitive adhesive layer 11 'is increased. Here, in a general display body in which a transparent conductive film, a pressure-sensitive adhesive layer and a glass plate are laminated in this order, the transparent conductive film is usually composed of a plastic plate (plate of polyethylene terephthalate or the like) which is easily permeable to water vapor. However, the thickness of the transparent electroconductive film is relatively thin, usually about 0.1 mm, so that it is considered that the problem of whitening is relatively suppressed. On the other hand, in the display body 2 according to the present embodiment, the plastic plate constituting at least one of the first display body constituting member 21 and the second display body constituting member 22 has a thickness of about 0.1 mm, As a matter of course, the whitening of the pressure-sensitive adhesive layer 11 'after curing can be well suppressed even when the thickness is relatively large as 0.2 to 5 mm as described above.

In the display body 2 according to the present embodiment, at least one of the first display body constituting member 21 and the second display body constituting member 22 has a thickness of 100 m and a thickness of 40 (M 2 · 24 h · 100 μm) or more and preferably 0.01 g / (m 2 · 24 h · 100 μm) or more as measured according to JIS K7129 under the conditions of , And more preferably 0.05 g / (m 2 · 24 h · 100 μm) or more. The water vapor permeability is preferably 100 g / (m 2 · 24 h · 100 μm) or less, particularly preferably 95 g / (m 2 · 24 h · 100 μm) or less and 85 g / (m 2 · 24 h · 100 μm) More preferable. Since the pressure-sensitive adhesive layer 11 'after the curing is derived from the pressure-sensitive adhesive sheet 1 according to the present embodiment, even if the plastic plate is made of a material having the above-described water vapor permeability and moisture is easily permeable, It is possible to satisfactorily suppress the whitening of the light emitting layer 11 '.

The water vapor permeability of the material constituting the above-mentioned plastic plate is measured in accordance with JIS K7129 under the conditions of 40 DEG C and 90% RH with respect to the water vapor permeability (measured value ), And then calculating from the measurement result the thickness of the plastic plate to 100 mu m using the following calculation formula.

Water vapor permeability (measured value) x (Actual thickness of plastic plate / 100) Water vapor permeability (g / (m 2 · 24 h · 100 μm)

The first display body constituting member 21 may be a glass plate other than the above-described plastic plate, or may be a protective panel made of a laminate including a glass plate, a plastic plate, or the like. When the first display body constituting member 21 is the protective panel, the printed layer 3 is formed on the side of the cured pressure-sensitive adhesive layer 11 'of the first display body constituting member 21 on the frame- .

The glass plate is not particularly limited and includes, for example, chemically strengthened glass, non-alkali glass, quartz glass, soda lime glass, barium-strontium glass, aluminosilicate glass, lead glass, borosilicate glass, barium borosilicate glass, . The thickness of the glass plate is not particularly limited, but is usually 0.1 to 10 mm, preferably 0.2 to 5 mm.

Various functional layers (a transparent conductive film, a metal layer, a silica layer, a hard coat layer, an antiglare layer, or the like) may be provided on one surface or both surfaces of a glass plate or a plastic plate constituting the first display body constituting member 21, Optical members may be laminated. The transparent conductive film and the metal layer may be patterned.

The second display body constituting member 22 is constituted by an optical member to be affixed to the first display body constituting member 21, a display body module (for example, a liquid crystal (LCD) module, a light emitting diode (LED) module, an organic electroluminescence (organic EL) module, etc.), an optical member as a part of the display body module, or a laminate including a display body module. The optical member, the display unit module, the laminate, and the like may also be provided with the above-described plastic plate.

Examples of the optical member include a light-scattering film, a polarizing plate (polarizing film), a polarizer, a retardation film (phase difference film), a viewing angle compensation film, a brightness enhancement film, a contrast enhancement film, a liquid crystal polymer film, A film, and a transparent conductive film. Examples of the shake-prevention film include a hard coat film formed by forming a hard coat layer on one side of a base film.

The material constituting the print layer 3 is not particularly limited, and known materials for printing are used. The thickness of the printing layer 3, that is, the lower limit of the height of the stepped portion is preferably 3 mu m or more, more preferably 5 mu m or more, particularly preferably 7 mu m or more, most preferably 10 mu m or more. With the above-described lower limit value, it is possible to sufficiently secure concealment such as disabling the electric wiring from being visible from the viewer side. The upper limit value is preferably 50 탆 or less, more preferably 35 탆 or less, particularly preferably 25 탆 or less, and more preferably 20 탆 or less. By the above-mentioned upper limit value, it is possible to prevent degradation of the step following property of the pressure-sensitive adhesive layer 11 'after curing with respect to the printing layer 3.

As the display body 2, for example, a liquid crystal (LCD) display, a light emitting diode (LED) display, an organic electroluminescence (organic EL) display, an electronic paper and the like may be mentioned. The display body 2 may be a member constituting a part of them.

In order to manufacture the display body 2, for example, one of the release sheets 12a of the pressure-sensitive adhesive sheet 1 is peeled off, and the pressure-sensitive adhesive layer 11, on which the pressure-sensitive adhesive sheet 1 is exposed, To the side of the constituent member 21 on which the print layer 3 is present. At this time, since the pressure sensitive adhesive layer 11 is excellent in the followability of the initial step difference, it is possible to suppress the occurrence of a gap or lifting in the vicinity of the stepped portion by the print layer 3.

The other release sheet 12b is peeled from the pressure-sensitive adhesive layer 11 of the pressure-sensitive adhesive sheet 1 and the pressure-sensitive adhesive layer 11 and the second display member constituting member 22, Are laminated to obtain a laminate. As another example, the order of combining the first display body constituent member 21 and the second display body constituent member 22 may be changed.

After obtaining the laminate, an active energy ray is irradiated to the pressure-sensitive adhesive layer 11 in the laminate. As a result, the pressure-sensitive adhesive layer 11 is cured to form the pressure-sensitive adhesive layer 11 'after curing. Thus, the display body 2 according to the present embodiment is obtained.

The irradiation of the energy ray with respect to the pressure-sensitive adhesive layer 11 is usually conducted over either the first display body constituting member 21 or the second display body constituting member 22, and preferably, Is performed over the sieve forming member (21).

Herein, the active energy ray means energy having both energy in the electromagnetic wave or charged particle beam, and specifically, ultraviolet ray, electron beam and the like can be mentioned. Of the active energy rays, ultraviolet rays which are easy to handle are particularly preferable.

The irradiation with ultraviolet rays can be performed by a high-pressure mercury lamp, a fusion H lamp, a xenon lamp, etc., and the irradiation amount of ultraviolet rays is preferably about 50 to 1000 mW / cm 2. The amount of light is preferably 50 to 10000 mJ / cm 2, more preferably 80 to 5000 mJ / cm 2, and particularly preferably 200 to 2000 mJ / 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 krad.

In the display body 2 according to the present embodiment, the vapor transmissivity of the first display body constituting member 21 is 0.001 g / (m < 2 > 24h) measured in accordance with JIS K7129 under conditions of 40 DEG C and 90% (M < 2 > 24h) measured in accordance with JIS K7129 under the conditions of 40 DEG C and 90% RH of the second display body constituting member 22, Or less. Here, when a plastic plate is used as the first display body constituting member 21 and a glass plate is used as the second display body constituting member 22, the first display body constituting member 21 and the second display body constituting member 22, And the water vapor permeability of the water vapor permeable film 22 is likely to fall within the above-mentioned range. If the display body 2 including the first display body constituting member 21 and the second display body constituting member 22 is left under high temperature and high humidity conditions, ), And is likely to reach the pressure-sensitive adhesive layer 11 'after curing. However, since the cured pressure-sensitive adhesive layer 11 'is derived from the pressure-sensitive adhesive sheet 1 according to the present embodiment, the whitening of the cured pressure-sensitive adhesive layer 11' can be satisfactorily suppressed. The above-described water vapor transmission rate in the first display body constituting member 21 is particularly preferably at least 0.05 g / (m 2 24 h), more preferably at least 0.1 g / (m 2 24 h). The water vapor permeability is particularly preferably 80 g / (m 2 · 24 h) or less, more preferably 50 g / (m 2 · 24 h) or less. The above-described water vapor transmission rate in the second display body constituting member 22 is particularly preferably at least 0.0001 g / (m 2 24 h), more preferably at least 0.0005 g / (m 2 24 h).

The water vapor permeability of each of the first display body constituting member 21 and the second display body constituting member 22 described above is set such that the first display body constituent member 21 and the second display body constituent member 22 Is measured using a transmittance meter in accordance with JIS K7129 under conditions of 40 DEG C and 90% RH. In this measurement, the thicknesses of the first display body constituting member 21 and the second display body constituting member 22 are the same as those actually used in the display body 2. Therefore, the above-described steam permeability is not the water vapor permeability as the material of each of the first display body constituting member 21 and the second display body constituting member 22, but the water vapor permeability as a member constituting the display body 2 .

In the display body 2 according to the present embodiment, since the post-curing pressure-sensitive adhesive layer 11 'is excellent in anti-wet heat and whitening property, the display body 2 is kept under high temperature and high humidity conditions % RH, 120 hours) and then returned to room temperature and normal humidity, the pressure-sensitive adhesive layer 11 'is suppressed from being whitened.

In addition, since the gel fraction of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 11 'after the curing is in the above-mentioned range, the pressure-sensitive adhesive exhibits a good cohesive force, so that the display body 2 can exhibit excellent blister resistance have.

The embodiments described above are described for the purpose of facilitating 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 modifications and equivalents falling within the technical scope of the present invention.

For example, either of the release sheets 12a and 12b in the pressure-sensitive adhesive sheet 1 may be omitted. The first display body constituting member 21 may have a step difference other than the print layer 3, or may not have a step difference. In addition to the first display body constituting member 21, the second display body constituting member 22 may have a step on the side of the cured pressure-sensitive adhesive layer 11 '.

(Example)

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

[Example 1]

1. Preparation of (meth) acrylic acid ester polymer (A)

55 parts by mass of 2-ethylhexyl acrylate, 5 parts by mass of 4-acryloylmorpholine, 15 parts by mass of isobornyl acrylate and 25 parts by mass of 2-hydroxyethyl acrylate were copolymerized by solution polymerization to obtain (meth) acrylic acid To prepare an ester polymer (A). The molecular weight of the (meth) acrylic acid ester polymer (A) was measured by the method described later, and the weight average molecular weight (Mw) was 60,000. The glass transition temperature (Tg; 占 폚) of the (meth) acrylic acid ester polymer (A) is determined based on the glass transition temperature (Tg) of the respective monomers constituting the (meth) acrylic acid ester polymer , And calculated by the formula of FOX, it was -36.5 占 폚.

2. Preparation of adhesive composition

100 parts by mass of the (meth) acrylic acid ester polymer (A) obtained in the above Step 1 (solid content conversion value: the same in the following) and 0.18 parts by mass of trimethylolpropane-modified tolylene diisocyanate (Toyo Khemsha, product name: BHS8515) And 7 parts by mass of? -Caprolactone-modified tris- (2-acryloxyethyl) isocyanurate (Shin-Nakamura Kagakusha Co., Ltd., product name "A-9300-1CL") as an active energy ray- , 0.7 part by mass of a mixture (BASF Co., product name "OMNIRAD 500") obtained by mixing benzophenone and 1-hydroxycyclohexyl phenyl ketone as a photopolymerization initiator (D) in a mass ratio of 1: 1, and 3 parts by mass of a silane coupling agent -Glycidoxypropyltrimethoxysilane (Shin-Etsu Chemical Co., Ltd., product name "KBM-403") were mixed and stirred sufficiently and diluted with methyl ethyl ketone to obtain a coating solution of the adhesive composition.

Table 1 shows the respective blend (solid content conversion value) of the adhesive composition when the (meth) acrylic acid ester polymer (A) was changed to 100 parts by mass (solid content conversion value). Details of the abbreviations, etc. shown in Table 1 are as follows.

[(Meth) acrylic acid ester polymer (A)]

 2EHA: 2-ethylhexyl acrylate

 BA: n-butyl acrylate

 ACMO: 4-acryloylmorpholine

 IBXA: isobornyl acrylate

 HEA: 2-hydroxyethyl acrylate

 4HBA: 4-hydroxybutyl acrylate

 HEMA: 2-hydroxyethyl methacrylate

[Photopolymerization initiator (D)]

 Photopolymerization initiator: A mixture of benzophenone and 1-hydroxycyclohexyl phenyl ketone in a mass ratio of 1: 1

3. Production of adhesive sheet

The coating solution of the sticky composition obtained in the above Step 2 was coated on a release treatment surface of a heavy-duty release sheet (LINTEC Corporation, product name " SP-PET752150 ") in which one side of the polyethylene terephthalate film was stripped with a silicone- Thereafter, the coating layer was heat-treated at 90 占 폚 for 1 minute to form a coating layer (thickness: 50 占 퐉). The peeling treatment side of the obtained intermediate peelable peel sheet with the coating layer and the peel treated side of the lightly peelable peel sheet (LINTEC CORPORATION, product name " SP-PET381130 ") in which one side of the polyethylene terephthalate film was peeled off with a silicone- And cured for 7 days under the conditions of 23 ° C and 50% RH. Thus, a pressure-sensitive adhesive sheet having a configuration of a heavy peeling releasing sheet / pressure-sensitive adhesive layer (thickness: 50 μm) / light recycling peel sheet was produced.

The thickness of the pressure-sensitive adhesive layer is a value measured using a constant pressure thickness gauge (trade name: " PG-02 ") according to JIS K7130.

[Example 2]

A coating solution of the sticky composition obtained in Step 2 of Example 1 was applied to a release treatment surface of a heavy-duty release sheet (LINTEC SHAZE, product name " SP-PET752150 ") in which one side of a polyethylene terephthalate film was stripped with a silicone- Coated with a coater and then subjected to a heat treatment at 90 占 폚 for 1 minute to form a coating layer (thickness: 50 占 퐉) to prepare a heavy peelable peeling sheet with a coating layer.

On the other hand, the coating solution of the sticky composition obtained in Step 2 of Example 1 was applied to the release treatment surface of a light-receding type release sheet (LINTEC Co., product name "SP-PET381130") in which one side of the polyethylene terephthalate film was peeled off with a silicone- , And then coated with a knife coater and then heat-treated at 90 占 폚 for 1 minute to form a coating layer (thickness: 50 占 퐉), whereby a lightly recyclable release sheet with a coating layer was produced.

The surface on the coating layer side of the heavy peelable peeling sheet with the coating layer obtained as described above and the surface on the coating layer side in one of the lightly peelable peeling sheets with the coating layer obtained as described above were pasted, A coating layer having a total thickness of 100 占 퐉 was sandwiched between a heavy release sheet and a lightweight release sheet to obtain a first layered product.

Next, with respect to the exposed surface of the coated layer exposed by peeling off the lightly recoil peeling sheet from the first laminate, the side of the coating layer side of one of the lightly peelable peeling sheets with the coated layer obtained as described above was adhered To obtain a second layered product in which a coating layer having a total thickness of 150 占 퐉 was sandwiched between a heavy-weight releasing peel sheet and a lightweight releasing peel sheet.

Next, with respect to the exposed surface of the coated layer exposed by peeling off the lightly recoil peeling sheet from the second laminate, the side of the coating layer side in one of the lightly peelable releasing sheets with the coated layer obtained as described above was adhered To obtain a third laminate in which a coating layer having a total thickness of 200 占 퐉 was sandwiched between a heavy-weight releasing peel sheet and a lightweight releasing peel sheet.

The exposed surface of the coated layer exposed by peeling off the lightly recoil peeling sheet from the third laminate was peeled off from the surface of the remaining one of the lightly peelable release sheets having the coated layer obtained as described above, To obtain a fourth laminate in which a coating layer having a total thickness of 250 占 퐉 was sandwiched between a heavy-weight releasing peel sheet and a lightweight releasing peel sheet.

The fourth layered product was cured for 7 days under the conditions of 23 ° C and 50% RH to produce a pressure-sensitive adhesive sheet having a configuration of a heavy-duty release sheet / pressure-sensitive adhesive layer (thickness: 250 μm) / light-

[Examples 3 to 7]

The type and ratio of each monomer constituting the (meth) acrylic acid ester polymer (A), the weight average molecular weight (Mw) of the (meth) acrylic acid ester polymer (A) and / or the blending amount of the cross- A pressure-sensitive adhesive sheet was produced in the same manner as in Example 1, except that the pressure-sensitive adhesive sheet was changed as described above.

[Example 8]

A pressure-sensitive adhesive sheet was produced in the same manner as in Example 2 except that the ratios of respective monomers constituting the (meth) acrylic acid ester polymer (A) and the blending amount of the crosslinking agent (B) were changed as shown in Table 1.

[Examples 9 to 10, Comparative Examples 1 to 4]

(A), the kind and ratio of each monomer constituting the (meth) acrylic acid ester polymer (A), the weight average molecular weight (Mw) of the (meth) acrylic acid ester polymer (A), the blending amount of the crosslinking agent ), And / or the amount of the photopolymerization initiator (D) were changed as shown in Table 1, a pressure-sensitive adhesive sheet was produced.

Here, the weight average molecular weight (Mw) described above is a weight average molecular weight in terms of polystyrene measured by gel permeation chromatography (GPC) under the following conditions (GPC measurement).

<Measurement Conditions>

GPC measurement apparatus: Tosoh Co., Ltd., HLC-8020

· GPC column (pass in the following order): Dososaje

  TSK guard column HXL-H

  TSK gel GMHXL (× 2)

  TSK gel G2000HXL

Measurement solvent: tetrahydrofuran

· Measuring temperature: 40 ℃

[Test Example 1] (Measurement of water vapor transmission rate)

The coating solution of the sticky composition prepared in Examples and Comparative Examples was applied to a release treatment surface of a heavy-duty release sheet (LINTEC SHAZE, product name &quot; SP-PET752150 &quot;) in which one side of a polyethylene terephthalate film was stripped with a silicone- , And then subjected to a heat treatment at 90 占 폚 for 1 minute to form a coating layer (thickness: 50 占 퐉) to prepare a heavy peelable peeling sheet with a coating layer.

On the other hand, the coating solution of the sticky composition prepared in Examples and Comparative Examples was applied to the release treatment surface of a lightly peelable release sheet (LINTEC SHAZETE, product name &quot; SP-PET381130 &quot;) in which one side of a polyethylene terephthalate film was peeled off with a silicone- Coated with a knife coater and then heat-treated at 90 占 폚 for 1 minute to form a coating layer (thickness: 50 占 퐉) to prepare a lightly reclosable peeling sheet with a coating layer.

The side of the coating layer side of the heavy peelable peeling sheet with the coating layer obtained as described above and the side of the coating layer side of the lightly peelable peeling sheet with the coating layer obtained as described above were pasted, 100 占 퐉 in thickness was sandwiched between a heavy-weight releasing sheet and a lightweight releasing peeling sheet to obtain a laminate. This laminate was cured for 7 days under conditions of 23 캜 and 50% RH to produce a pressure-sensitive adhesive sheet in which a heavy-duty release sheet, a pressure-sensitive adhesive layer having a thickness of 100 탆 and a light- did.

The pressure-sensitive adhesive layer in the resulting pressure-sensitive adhesive sheet was irradiated with ultraviolet rays under the following condition of a lightly curved release sheet to cure the pressure-sensitive adhesive layer to obtain a pressure-sensitive adhesive layer after curing.

<Ultraviolet irradiation condition>

· Using high pressure mercury lamp

Illumination 200 mW / cm 2, light quantity 1000 mJ / cm 2

· UV illuminance · Using UVPF-A1 for light intensity meter

Subsequently, the cured pressure-sensitive adhesive layer was sandwiched between two pieces of Tetralon mesh # 380, and a transmittance measuring machine (product name: "L80-5000" manufactured by LYSSY Co., Ltd.) was placed under the conditions of 40 ° C. and 90% RH in accordance with JIS K7129 (G / (m &lt; 2 &gt; 24h, 100 mu m)) was measured. The results are shown in Table 2.

[Test Example 2] (Measurement of gel fraction)

The pressure-sensitive adhesive sheet obtained in Examples and Comparative Examples was cut into a size of 80 mm x 80 mm, the pressure-sensitive adhesive layer was wrapped with a polyester mesh (mesh size 200), the mass was weighed with a precision balance, The mass of the adhesive alone was calculated by subtracting the mass. The mass at this time is defined as M1.

Next, the adhesive wrapped with the polyester-made mesh was immersed in ethyl acetate at room temperature (23 ° C) for 24 hours. Thereafter, the pressure-sensitive adhesive was taken out and air-dried for 24 hours under 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. Let the mass at this time be M2. The gel fraction (%) is represented by (M2 / M1) x100. As a result, the gel fraction (before UV irradiation) of the pressure-sensitive adhesive was derived. The results are shown in Table 2.

Further, the pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples were irradiated with ultraviolet rays (UV) under the conditions of ultraviolet irradiation as in Test Example 1, over a lightly curled release sheet to cure the pressure-sensitive adhesive layer to obtain a pressure-sensitive adhesive layer after curing. A gel fraction (after UV irradiation) was derived for the pressure-sensitive adhesive of the pressure-sensitive adhesive layer after the curing in the same manner as described above. The results are shown in Table 2.

[Test Example 3] (Measurement of adhesive force)

The lightly peelable release sheet was peeled off from the pressure-sensitive adhesive sheet obtained in Examples and Comparative Examples and the exposed pressure-sensitive adhesive layer was laminated on a polyethylene terephthalate (PET) film (Toyobo Co., Ltd., product name: "PET A4300" , Thickness: 100 占 퐉) was laminated to obtain a laminate of a heavy peelable release sheet / pressure-sensitive adhesive layer / PET film. The obtained laminate was cut into a width of 25 mm and a length of 100 mm.

Releasing sheet was peeled off from the laminate under an environment of 23 占 폚 and 50% RH, and the exposed pressure-sensitive adhesive layer was attached to soda lime glass (Nihon Itagarasu Co.) MPa, at 50 DEG C for 20 minutes. Subsequently, the pressure-sensitive adhesive layer was irradiated with ultraviolet rays (UV) over the PET film under the ultraviolet irradiation conditions as in Test Example 1 to cure the pressure-sensitive adhesive layer to obtain a pressure-sensitive adhesive layer after curing. The sample having the pressure-sensitive adhesive layer after curing was allowed to stand for 24 hours under the conditions of 23 占 폚 and 50% RH. Then, using a tensile tester (Orientec Corporation, Tensilon) The adhesive force (N / 25 mm) was measured under the conditions shown in Fig. Conditions other than those described herein were measured in accordance with JIS Z 0237: 2009. The results are shown in Table 2.

[Test Example 4] (Measurement of haze value)

The haze value (%) of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet obtained in Examples and Comparative Examples was measured using a haze meter (product name "NDH-2000" manufactured by Nippon Denshoku Kogyo Co., Ltd.) in accordance with JIS K7136: 2000 . The results are shown in Table 2.

[Test Example 5] (Measurement of step following rate)

(UV-curable ink, product name: POS-911 Muka) was applied on the surface of a glass plate (product name: Corning Glass Eagle XG, length 90 mm x width 50 mm x thickness 0.5 mm) (Outline: 90 mm in length x 50 mm in width and 5 mm in width) so as to be one of 10 占 퐉, 15 占 퐉, 20 占 퐉 and 30 占 퐉. Next, the printed ultraviolet curable ink was cured by irradiating ultraviolet rays (80 W / cm 2, metal halide lamp 2, lamp height 15 cm, belt speed 10 to 15 m / min) : 10 mu m, 15 mu m, 20 mu m, 30 mu m, 100 mu m, and 150 mu m).

The lightly peelable release sheet was peeled off from the pressure-sensitive adhesive sheet obtained in Examples and Comparative Examples, and the exposed pressure-sensitive adhesive layer was laminated on a polyethylene terephthalate (PET) film (Toyobo Co., Ltd., product name "PET A4300" Was bonded to this adhesive layer. Next, the intermediate release type peeling sheet was peeled to expose the pressure-sensitive adhesive layer, and a laminate (product name: &quot; LPD3214 &quot;) was laminated on each stepped glass plate so that the pressure- did. Thereafter, the autoclave treatment was carried out for 30 minutes under the conditions of 50 DEG C and 0.5 MPa, and left at normal pressure, 23 DEG C and 50% RH for 24 hours.

Next, the pressure-sensitive adhesive layer was irradiated with ultraviolet rays under the ultraviolet irradiation conditions as in Test Example 1 over the PET film to cure the pressure-sensitive adhesive layer to obtain a pressure-sensitive adhesive layer after curing. Subsequently, the laminate was stored for 72 hours under a high-temperature and high-humidity condition of 85 DEG C and 85% RH (endurance test), and then the step traceability was evaluated. The step following property is determined by whether or not the printed step is completely filled by the pressure-sensitive adhesive layer after curing. When bubbles, lifting, peeling, or the like are observed at the interface between the printed step and the cured pressure-sensitive adhesive layer, It can not be done. Here, the step following ability was evaluated as a step following rate (%) expressed by the following equation. The results are shown in Table 2.

(%) = {(Height of stepped portion (m) maintained in a state of being filled without bubbling, lifting, peeling, etc. after durability test) / (thickness of pressure-sensitive adhesive layer after curing)} x 100

[Test Example 6] (Evaluation of blister resistance)

The pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet obtained in Examples and Comparative Examples was laminated on a non-alkali glass plate having a thickness of 1.1 mm and a plastic plate (Mitsubishi Rayon Co., M 2 · 24 h · 100 μm). Thereafter, the autoclave treatment was carried out for 30 minutes under the conditions of 50 DEG C and 0.5 MPa, and left at normal pressure, 23 DEG C and 50% RH for 24 hours.

Next, the pressure-sensitive adhesive layer was irradiated with ultraviolet rays under the conditions of ultraviolet irradiation as in Test Example 1 over the resin plate to cure the pressure-sensitive adhesive layer to obtain a pressure-sensitive adhesive layer after curing. Subsequently, the laminate was stored for 72 hours under high temperature and high humidity conditions of 85 캜 and 85% RH. Thereafter, the state at the interface between the pressure-sensitive adhesive layer and the adherend after curing was confirmed by naked eyes and the blister resistance was evaluated by the following criteria. The results are shown in Table 2.

 ◎: No bubbles, peeling, peeling

 ○: Two or one bubbles having a diameter of less than 1 mm were generated, but there was no lifting or peeling.

 X: Bubbles, peeling, peeling occurred

[Test Example 7] (Evaluation of wet heat resistance)

The pressure-sensitive adhesive layers of the pressure-sensitive adhesive sheets obtained in Examples and Comparative Examples were laminated on a non-alkali glass plate having a thickness of 1.1 mm (water vapor permeability of 0.0006 g / (m 2 · 24 h)) and a plastic plate of 0.7 mm thickness (Mitsubishi Rayon Co., Light MR-200 &quot;, and water vapor permeability of 44 g / (m 2 · 24 h · 100 μm)) to obtain a laminate. The composition was defined as composition A. The obtained laminate was subjected to autoclave treatment at 50 캜 under 0.5 MPa for 20 minutes and then left at normal pressure, 23 캜, and 50% RH for 24 hours.

Thereafter, the pressure-sensitive adhesive layer was irradiated with ultraviolet rays under the conditions of ultraviolet irradiation as in Test Example 1, over the plastic plate to cure the pressure-sensitive adhesive layer to obtain a pressure-sensitive adhesive layer after curing.

(%) Was measured according to JIS K7136: 2000 using a haze meter (manufactured by Nippon Denshoku Chemical Co., Ltd., product name "NDH2000") for the laminate after irradiation with ultraviolet rays. The results are shown in Table 2 as a haze value (%) before the durability test according to the composition A.

Next, the laminate after irradiation with ultraviolet rays was stored for 1000 hours (durability test) under the conditions of 85 ° C and 85% RH under a humid condition, and then left standing at room temperature and normal humidity at 23 ° C and 50% RH for 24 hours. The haze value (%) of the laminate was measured in the same manner as described above. The results are shown in Table 2 as a haze value (%) after the durability test according to the composition A.

Based on the above results, the haze value (%) after the durability test was subtracted from the haze value (%) before the durability test to calculate the difference. The results are shown in Table 2 as differences in haze values before and after the durability test according to the composition A.

Further, on the basis of the difference in haze values before and after the calculated endurance test, the anti-wet heat resistance was evaluated based on the following criteria. The results are shown in Table 2 as anti-wet heat whitening properties according to composition A.

 ?: Difference in haze value is less than 1.5

 ?: Difference in haze value between 1.5 and less than 8.0

 X: Difference in haze value between 8.0 and higher

In addition, the post-curing pressure-sensitive adhesive layer having the evaluation of anti-wet heat whitening property as "?" Can be said to be free from whitening at all and to be used satisfactorily on a display body or the like. In the cured pressure-sensitive adhesive layer of &quot;? &Quot;, whitening is observed, but it can be said that the pressure-sensitive adhesive layer can also be used for a display or the like. The pressure-sensitive adhesive layer after the cure of &quot; X &quot; is whitened and is not suitable for use on a display or the like.

(Manufactured by Mitsubishi Rayon Co., Ltd., product name "Acrylite MR-200", water vapor permeability of 44 g / (m 2 24 h 100 탆)) having a thickness of 2.0 mm was used in the laminate according to the above- Mm thick plastic plate (made by Jane Co., Ltd. under the product name of "Plywood Sheet PC1151", water vapor permeability: 38 g / (m 2 · 24 h · 100 μm)). The structure of the laminate is referred to as structure B. The haze value (%) before the durability test and the haze value (%) after the durability test were measured for the laminate according to this composition B as well as the laminate according to the composition A, and the difference in haze value before and after the durability test And evaluated for anti-wet heat whitening performance. The results are shown in Table 2.

[Table 1]

[Table 2]

As can be seen from Table 2, the cured pressure-sensitive adhesive layer formed by using the pressure-sensitive adhesive sheet obtained in the examples was excellent both in blister resistance and in wet heat resistance.

The pressure-sensitive adhesive sheet of the present invention can be suitably used, for example, for bonding a protective panel made of a plastic plate to a desired display body constituting member.

1: Pressure sensitive adhesive sheet
11: Pressure-sensitive adhesive layer
12a, 12b: peeling sheet
2:
11 ': Pressure-sensitive adhesive layer after curing
21: first display body constituting member
22: second display body constituting member
3: Printing layer

Claims (8)

A pressure-sensitive adhesive sheet having at least a pressure-sensitive adhesive layer composed of an active energy ray-curable pressure-sensitive adhesive,
Cured pressure-sensitive adhesive layer formed by curing the pressure-sensitive adhesive layer having a thickness of 100 占 퐉 by irradiation of an active energy ray was sandwiched between two pieces of tetron meshes # 380 and the pressure-sensitive adhesive layer was cured at 40 占 폚 and 90% RH in accordance with JIS K7129 The measured moisture permeability of the pressure-sensitive adhesive layer after curing is not less than 108 g / (m 2 · 24 h · 100 μm) and not more than 200 g / (m 2 · 24 h · 100 μm)
When the gel fraction of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer after curing is 60% or more and 95% or less
Wherein the pressure-sensitive adhesive sheet is a pressure-sensitive adhesive sheet. The method according to claim 1,
A pressure-sensitive adhesive layer having a thickness of 50 占 퐉 was sandwiched between a glass plate and a plastic plate having a thickness of 0.7 mm. The pressure-sensitive adhesive layer was cured by irradiation of active energy rays to form a pressure-sensitive adhesive layer after curing. Was subjected to a durability test in which the sample was stored under the moist heat condition of 85 ° C and 85% RH for 1000 hours. Next, the haze value before the durability test was measured from the haze value when stored at 23 ° C and 50% Is less than 1.5. &Lt; RTI ID = 0.0 &gt; 8. &lt; / RTI &gt; The method according to claim 1,
A pressure-sensitive adhesive layer having a thickness of 50 탆 was sandwiched between a glass plate and a plastic plate having a thickness of 2.0 mm. The pressure-sensitive adhesive layer was cured by irradiation of active energy rays to form a pressure-sensitive adhesive layer after curing. Was subjected to a durability test in which the sample was stored under the moist heat condition of 85 ° C and 85% RH for 1000 hours. Next, the haze value before the durability test was measured from the haze value when stored at 23 ° C and 50% Is less than 8. &lt; RTI ID = 0.0 &gt; 8. &lt; / RTI &gt; The method according to claim 1,
Wherein the pressure-sensitive adhesive constituting the pressure-
(A) having a crosslinking structure composed of the (meth) acrylic acid ester polymer (A) and a crosslinking agent (B)
(C) containing an active energy ray-curable component
Wherein the pressure-sensitive adhesive sheet is a pressure-sensitive adhesive sheet. The method according to claim 1,
Two peeling sheets,
Wherein the pressure-sensitive adhesive layer (2) sandwiched between the peeling sheet (2) and the peeling sheet
And a pressure-sensitive adhesive sheet. One display body constituting member,
Another display body constituting member,
A pressure-sensitive adhesive layer after the curing of the one display body constituting member and the other display body constituting member
And a display body,
At least one of the one display body constituting member and the other display body constituting member is made of a plastic plate,
Wherein the pressure-sensitive adhesive layer after curing is a pressure-sensitive adhesive layer after curing which is obtained by curing the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet according to any one of claims 1 to 5
. The method according to claim 6,
The plastic plate has a thickness of 100 占 퐉 and a water vapor transmission rate of not less than 0.001 g / (m ∙ 24 h 揃 100 袖 m), 100 g / (m 揃 24 h 揃 100 袖 m) measured in accordance with JIS K7129 under the conditions of 40 캜 and 90% By mass or less. The method according to claim 6,
Wherein the one display member constituting member has a vapor transmissivity of not less than 0.001 g / (m 2 · 24h) and not more than 100 g / (m 2 · 24h) measured in accordance with JIS K7129 under conditions of 40 ° C. and 90% RH,
Wherein the other display body constituting member has a vapor transmissivity measured according to JIS K7129 under the conditions of 40 DEG C and 90% RH of 0.001 g / (m &lt; 2 &gt;
.

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