JPH11140398A - Adhesive sheet and method for sticking adhesive sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an adhesive sheet which, when stuck to a rough surface of an adherend, can prevent air from being entrapped since the adhesive comes into minute dents of the rough surface and which has an excellent heat resistance after the exposure to a radiation by incorporating a specified amt. of a radiation-curable resin into an adhesive. SOLUTION: This adhesive sheet has an adhesive layer having a thickness of 10-200 μm and formed from a compsn. prepd. by compounding 100 pts.wt. adhesive suitable for the attempted application, pref. an acrylic one, with 2.5-25 pts.wt. radiation-curable resin. The dynamic storage modulus (G'1 ) of the adhesive layer before the exposure to a radiation is 1×10<4> -1×10<6> dyn/cm<2> , and the ratio (G'2 /G'1 )of the dynamic modulus (G'2 ) after the exposure to G'1 is 1.5-20. This adhesive sheet having the one side or both sides covered with a release sheet is stuck to a rough surface of an adherend at normal temp. to 120 deg.C, then pressed with a press roll, etc., to prevent air entrapment, and exposed to a radiation such as ultraviolet rays or an electron beam to cure the radiation-curable resin, thus improving the elastic modulus and heat resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a pressure-sensitive adhesive sheet which can prevent air from being enclosed when a pressure-sensitive adhesive sheet is bonded to a rough surface of an adherend, and has excellent heat resistance after irradiation. The present invention relates to a method for bonding the pressure-sensitive adhesive sheet.

[0002]

2. Description of the Related Art Conventionally, when an adhesive sheet is bonded to a rough surface of an adherend, the adhesive does not penetrate deep into the fine concave portions, and air is left behind the fine concave portions and sealed. The performance of the adherend was sometimes reduced. For example, the screen of a projection television has a structure in which a lenticular sheet that projects an image is bonded to the surface of a substrate such as an acrylic plate that constitutes the screen, and the lenticular sheet has fine irregularities. If a conventional adhesive sheet is used to bond the rough surface of the lenticular sheet to the screen substrate, air will be left behind the fine recesses and sealed, and the image will be projected clearly There was a drawback that it was not possible. In addition, when an adhesive having a reduced molecular weight is used to improve the suitability for lamination on a rough surface, sufficient heat resistance cannot be obtained, and foaming, floating, swelling, and the like occur. On the other hand, when a sheet made of a heat-sensitive adhesive is used instead of the conventional pressure-sensitive adhesive sheet and the rough surface of the lenticular sheet is bonded to the screen substrate, there is a disadvantage that heat resistance is poor.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned situation of the prior art, and has been described in detail when it is bonded to a rough surface of an adherend. An object of the present invention is to provide a pressure-sensitive adhesive sheet which can prevent air from being enclosed by being filled with a pressure-sensitive adhesive and has excellent heat resistance after irradiation.

[0004]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, the solid content ratio of the adhesive was 2.5 to 25 parts by weight based on 100 parts by weight of the solid content. It has been found that the above object can be achieved by a pressure-sensitive adhesive sheet comprising a pressure-sensitive adhesive layer containing a radiation-curable resin, and the present invention has been completed based on this finding.

That is, the present invention relates to an adhesive and radiation curing
Radiation-curing type
Resin content ratio is 100 parts by weight of adhesive in solids ratio
2.5 to 25 parts by weight of an adhesive sheet
Is provided. Further, the present invention provides the adhesive sheet
The adhesive layer has a dynamic storage elasticity before irradiation.
Rate G ₁’ Is 1 × 10^Four~ 1 × 10⁶dyn / cm^TwoAnd
And the dynamic storage modulus G ₁’ After irradiation
Storage modulus G _Two’ Ratio (G _Two’ / G ₁’ ) Is 1.5-2
The purpose of the present invention is to provide a pressure-sensitive adhesive sheet having a property of
You. Further, the present invention provides the pressure-sensitive adhesive sheet described above,
Adhesive sheet characterized in that it is bonded to
It provides a method of bonding the pieces. Hereinafter, the present invention is described in detail.
This will be described in detail.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, the pressure-sensitive adhesive layer contains a pressure-sensitive adhesive and a radiation-curable resin. Specific examples of the adhesive include, for example, a natural rubber-based adhesive, a synthetic rubber-based adhesive,
An acrylic resin-based adhesive, a polyvinyl ether resin-based adhesive, a urethane resin-based adhesive, a silicone resin-based adhesive, and the like can be given. When the pressure-sensitive adhesive sheet of the present invention is applied to a rough surface of a lenticular sheet for a screen of a projection television, an acrylic resin-based pressure-sensitive adhesive is preferable because most of the screen substrate is made of a methyl methacrylate resin.

Specific examples of the acrylic resin-based pressure-sensitive adhesive include:
Ethyl acrylate, butyl acrylate, isobutyl acrylate, amyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, cyclohexyl acrylate, alkyl acrylate such as benzyl acrylate, butyl methacrylate, methacrylic acid-2 -Ethylhexyl, cyclohexyl methacrylate, methacrylates such as benzyl methacrylate and the like, or a homopolymer of a monomer that gives a low Tg polymer with adhesive properties, or a copolymer of two or more of these monomers, and the like, preferably It is a copolymer of two or more monomers.

Further, the acrylic resin-based polymer is bonded to a vinyl group-containing compound such as methyl acrylate, methyl methacrylate, ethyl methacrylate, vinyl acetate, vinyl propionate, vinyl ether, styrene, acrylonitrile, and methacrylonitrile. One or more comonomers that provide high Tg polymers with performance and cohesion capabilities can be copolymerized. The comonomer content is preferably at most 40% by weight, particularly preferably at most 30% by weight.

Further, the acrylic resin-based polymer includes:
Acrylic acid, methacrylic acid, crotonic acid, maleic acid,
Carboxyl group-containing monomers such as fumaric acid and itaconic acid, 2-hydroxyethyl (meth) acrylate, 2-
Hydroxyl-containing monomers such as hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, N-methylol acrylamide, allyl alcohol, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) ) Tertiary amino group-containing monomers such as acrylate, amide group-containing monomers such as acrylamide and methacrylamide, N-methyl (meth) acrylamide, N-ethyl (meth) acrylamide, N
Functional groups such as N-substituted amide group-containing monomers such as -methoxymethyl (meth) acrylamide, N-ethoxymethyl (meth) acrylamide, Nt-butylacrylamide and N-octylacrylamide; and epoxy group-containing monomers such as glycidyl methacrylate One or more of the contained monomers can be copolymerized. The content ratio of the functional group-containing monomer is preferably 20% by weight or less, particularly preferably 10% by weight or less.

Particularly preferred examples of the acrylic resin-based pressure-sensitive adhesive include butyl acrylate, methyl acrylate,
Copolymers of acrylic acid and 2-ethylhexyl acrylate, butyl acrylate, isobutyl acrylate and copolymers of acrylic acid can be mentioned.

The radiation-curable resin is not particularly limited as long as it is a resin that can be cured by irradiation with radiation such as ultraviolet rays, laser beams, α-rays, β-rays, γ-rays, X-rays, and electron beams. A resin that is cured by irradiation with UV light is preferable, and a resin that is cured by irradiation with UV light is particularly preferable. As a specific example of such a radiation-curable resin, a radiation-curable acrylic monomer or oligomer is preferable. Examples of the radiation-curable acrylic monomers and oligomers include hexanediol di (meth) acrylate, ethylene glycol di (meth) acrylate,
Propylene glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, urethane acrylate, epoxy acrylate, polyester acrylate, and the like. Species can be used alone or in combination of two or more.

Further, the radiation-curable acrylic monomer or oligomer preferably contains a reactive monomer or oligomer having an acryloyl group, and more preferably has two or more acryloyl groups. By including two or more acryloyl groups, a network structure is sufficiently formed, the cohesiveness of the pressure-sensitive adhesive is further improved, and a good pressure-sensitive adhesive layer is obtained.

As the radiation-curable resin, a reactive diluent is preferably used in addition to the radiation-curable resin.
Examples of the reactive diluent include N-vinylpyrrolidone, 2-ethylhexyl (meth) acrylate, and cyclohexyl (meth) acrylate, and preferably N-vinylpyrrolidone.

[0014] The content of the radiation-curable resin is 2.5 to 25 parts by weight (solid content), preferably 4 to 15 parts by weight (solid content), based on 100 parts by weight of the solid content of the pressure-sensitive adhesive. When the content of the radiation-curable resin is less than 2.5 parts by weight, the adherence to the rough surface shape of the adherend is poor, and the pressure-sensitive adhesive composition cannot be inserted deep into the fine concave portions of the rough surface. . On the other hand, when the content of the radiation-curable resin exceeds 25 parts by weight, the adhesiveness after irradiation with radiation is poor.

In the present invention, the pressure-sensitive adhesive layer is formed before irradiation.
Dynamic storage modulus G of ₁’ Is 1 × 10^Four~ 1 × 10⁶dyn
/ Cm^TwoParticularly preferably 1 × 10^Five~ 1 × 10⁶dyn
/ Cm^TwoAnd the dynamic storage modulus G ₁’ Release against
Dynamic storage modulus G after irradiation _Two’ Ratio (G _Two’ /
G ₁’ ) Is from 1.5 to 20, particularly preferably from 1.7 to 10
It is preferable to have the following characteristics. Before irradiation
Dynamic storage modulus G of ₁’ And ammunition after irradiation
Sex factor G _Two’ Is 25 ° C., frequency ω = 10 ra
d / sec, distortion = 5%.

The pressure-sensitive adhesive layer may contain a radiation initiator, a tackifier, a filler, a softener, a wax, an antioxidant, an ultraviolet absorber, a cross-linking agent, a silane coupling agent, and the like, if necessary. be able to. As the radiation initiator,
Benzyl dimethyl ketal, benzoin isopropyl ether, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (methylthio) phenyl]
-2-morpholinopropanone-1,2-hydroxy-2
And ultraviolet initiators such as -methylphenyl-propan-1-one. Examples of the tackifier include a rosin resin, a terpene phenol resin, a terpene resin, an aromatic hydrocarbon-modified terpene resin, a petroleum resin, a coumarone / indene resin, a styrene resin, a phenol resin, and a xylene resin. Examples of the filler include zinc white, titanium oxide, silica, calcium carbonate, barium sulfate, and the like. Examples of the softener include process oil, liquid rubber, plasticizer, and the like. Examples of the wax include a natural wax, a mineral wax, a polyethylene wax, and a paraffin wax. Examples of the antioxidant include anilide-based, phenol-based, phosphite-based, and thioester-based. Examples of the ultraviolet absorber include benzophenone type and benzotriazole type, and examples of the crosslinking agent include epoxy type, isocyanate type, metal chelate type, melamine type and aziridine type. Examples of the silane coupling agent include γ-glycidoxypropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, and the like. The thickness of the pressure-sensitive adhesive layer of the present invention is preferably equal to or more than the depth of the unevenness of the rough surface of the adherend to which the pressure-sensitive adhesive sheet is to be bonded. The thickness of the pressure-sensitive adhesive layer is usually 10 to
The thickness may be 200 μm, and particularly preferably 20 to 100 μm.

The pressure-sensitive adhesive sheet of the present invention can be covered on one or both sides with a release sheet. The release sheet is made of a support base material having at least one side having a releasability, and is usually obtained by subjecting the support base body to a release treatment. Examples of the support substrate include paper, synthetic paper, and plastic film. Examples of the paper include glassine paper and polyethylene laminated paper, and examples of the plastic film include a polyethylene resin, a polyolefin resin such as a polypropylene resin, a polybutylene terephthalate resin, a polyester resin such as a polyethylene terephthalate resin, an acetate resin, and a polystyrene resin. And plastic films such as vinyl chloride resin, but are not limited thereto. When the pressure-sensitive adhesive sheet of the present invention is bonded to a rough surface of an adherend and the radiation sheet is irradiated with radiation from above the release sheet, the release sheet needs to transmit radiation.

Examples of the release treatment agent used for the release sheet include silicone resins, alkyd resins, and fluororesins. The thickness of the release sheet is not particularly limited,
What is necessary is just to select suitably. The method for producing the pressure-sensitive adhesive sheet of the present invention can be carried out by various methods. As a preferred example, a mixture of the above-mentioned pressure-sensitive adhesive and a radiation-curable resin, and if necessary, various additives, A method in which a suitable solvent is mixed and applied on a release sheet.

The pressure-sensitive adhesive sheet of the present invention can be bonded to a rough surface of an adherend having various rough surfaces. The depth of the unevenness of the rough surface of the adherend is not particularly limited, but the pressure-sensitive adhesive sheet of the present invention can be applied even if the unevenness has a depth of 30 μm or more. Specific examples of the adherend having a rough surface include, for example, a lenticular sheet to be bonded to a surface of a screen substrate of a projection television, an embossed sheet, a thick-film printed sheet, and a sheet provided with an electronic circuit. , And the like. The bonding of the pressure-sensitive adhesive sheet of the present invention to the rough surface of the adherend can be performed at normal temperature to 120 ° C. Further, it is preferable to pressurize at the time of lamination, and as a pressing means, for example, a method of passing a laminate obtained by laminating an adhesive sheet on an adherend between a pair of rolls and the like can be mentioned.

The pressure-sensitive adhesive sheet of the present invention is bonded to a rough surface of an adherend, and can maintain sufficient tackiness even after being irradiated with radiation. The radiation dose is not particularly limited,
In the case of ultraviolet irradiation, it is usually 0.05 to 5 J, but preferably 0.1 to 2 J. In addition, in the case of electron beam irradiation, it may be usually 0.01 to 100 KGy,
Preferably it is 0.1 to 50 KGy. The pressure-sensitive adhesive sheet of the present invention can be used for laminating one surface of a pressure-sensitive adhesive layer to a rough surface of an adherend and laminating the other surface of the pressure-sensitive adhesive layer to another adherend.

The pressure-sensitive adhesive sheet of the present invention can be suitably used for a rough surface of a lenticular sheet to be bonded to a surface of a screen substrate of a projection television. One specific example of bonding the pressure-sensitive adhesive sheet of the present invention to a rough surface of a lenticular sheet will be described with reference to the drawings. As the pressure-sensitive adhesive sheet of the present invention, for example, a pressure-sensitive adhesive sheet having a sectional view as shown in FIG. Remove one of the release sheets 2,
As shown in FIG. 2, the surface of the pressure-sensitive adhesive layer 1 is stuck to the rough surface of the lenticular sheet 3, and the pressure-sensitive adhesive composition is filled to the depth of the fine concave portions on the rough surface, so that air is not sealed. Subsequently, the pressure-sensitive adhesive layer 1 is cross-linked by irradiation with radiation. Irradiation with radiation may be performed from the front side of the lenticular sheet 3 or may be performed from the front side of the release sheet 2. When the irradiation of radiation is performed from the front side of the release sheet 2, the radiation irradiation may be performed after the release sheet 2 is removed.
Thereafter, if the release sheet 2 remains, the release sheet 2 is removed, and the surface of the pressure-sensitive adhesive layer 1 is bonded to the surface of the screen substrate of the projection television to complete the projection television screen. In addition,
Irradiation may be performed after one surface of the pressure-sensitive adhesive layer 1 is bonded to the rough surface of the lenticular sheet 3 and the other surface of the pressure-sensitive adhesive layer 1 is bonded to the surface of a screen substrate of a projection television. . From the viewpoint of reducing the irradiation amount of the radiation, the irradiation of the radiation is performed after the surface of the pressure-sensitive adhesive layer 1 is bonded to the rough surface of the lenticular sheet 3 and before bonding to the surface of the screen substrate of the projection television. It is preferred to do so.

[0022]

Next, the present invention will be described more specifically with reference to examples. The present invention is not limited by these examples. The pressure-sensitive adhesive and radiation-curable resin used in the examples are shown below. (1) Acrylic adhesive A: butyl acrylate / methyl acrylate / acrylic acid / -2-ethylhexyl acrylate in a weight ratio of 78.5 / 16.5 / 4.5 / 0.5. Contained copolymer, weight average molecular weight = 700,0
(2) Acrylic pressure-sensitive adhesive B: butyl acrylate / isobutyl acrylate / acrylic acid in a weight ratio of 80/17/3
Copolymer containing the following composition, weight average molecular weight = 3,50
000 (3) Radiation-curable resin composition: dipentaerythritol hexaacrylate / pentaerythritol triacrylate / N-vinyl-pyrrolidone in a weight ratio of 40/3.
The composition containing 0/15 at a composition ratio was mixed with an ultraviolet initiator (1
-Hydroxycyclohexyl phenyl ketone) containing 15% by weight of the total composition

Example 1 To 100 parts by weight (solid content) of an acrylic pressure-sensitive adhesive A, 6 parts by weight (solid content) of a radiation-curable resin composition and 0.1 part of a chelating crosslinker of aluminum tris (acetylacetonate) were added. The adhesive composition mixed with 15 parts by weight (solid content) is applied to the release surface of a release sheet made of a transparent polyethylene terephthalate resin film having a thickness of 38 μm so that the adhesive layer has a thickness of 80 μm. The surface of the agent layer was covered with a release sheet of a transparent polyethylene terephthalate resin film having a thickness of 38 μm to prepare an adhesive sheet.

Example 2 Based on 100 parts by weight (solids) of an acrylic pressure-sensitive adhesive B, 5.5 parts by weight (solids) of a radiation-curable resin composition and isocyanate-based crosslinking of trimethylolpropane adduct toluylenediisocyanate An adhesive composition obtained by mixing 3.5 parts by weight (solid content) of the agent is applied to the release surface of a release sheet made of a transparent polyethylene terephthalate resin film having a thickness of 38 μm so that the thickness of the adhesive layer becomes 80 μm. Further, the surface of the pressure-sensitive adhesive layer was covered with a release sheet of a transparent polyethylene terephthalate resin film having a thickness of 38 μm to prepare a pressure-sensitive adhesive sheet.

Example 3 14 parts by weight (solid content) of a radiation-curable resin composition and 100 parts by weight (solid content) of an acrylic pressure-sensitive adhesive A were added with 0.1 parts of a chelating crosslinking agent of aluminum tris (acetylacetonate). The adhesive composition mixed with 15 parts by weight (solid content) is applied to the release surface of a release sheet made of a transparent polyethylene terephthalate resin film having a thickness of 38 μm so that the adhesive layer has a thickness of 80 μm. The surface of the agent layer was covered with a release sheet of a transparent polyethylene terephthalate resin film having a thickness of 38 μm to prepare an adhesive sheet.

Example 4 20 parts by weight (solid content) of a radiation-curable resin composition and 100 parts by weight (solid content) of an acrylic pressure-sensitive adhesive A were added with 0.1 parts of a chelating crosslinking agent of aluminum tris (acetylacetonate). The adhesive composition mixed with 15 parts by weight (solid content) is applied to the release surface of a release sheet made of a transparent polyethylene terephthalate resin film having a thickness of 38 μm so that the adhesive layer has a thickness of 80 μm. The surface of the agent layer was covered with a release sheet of a transparent polyethylene terephthalate resin film having a thickness of 38 μm to prepare an adhesive sheet.

Example 5 Radiation containing dipentaerythritol hexaacrylate / pentaerythritol triacrylate / N-vinylpyrrolidone in a weight ratio of 48/35/17 with respect to 100 parts by weight (solid content) of the acrylic pressure-sensitive adhesive A. 5 parts by weight (solid content) of a curable resin and 0.1% of a chelating cross-linking agent of aluminum tris (acetylacetonate)
A pressure-sensitive adhesive sheet was prepared in the same manner as in Example 1 using the pressure-sensitive adhesive composition mixed with 5 parts by weight (solid content).

Comparative Example 1 An adhesive sheet was prepared in the same manner as in Example 1 except that the radiation-curable resin composition was not mixed.

Comparative Example 2 An adhesive sheet was prepared in the same manner as in Example 2, except that the radiation-curable resin composition was not mixed.

Comparative Example 3 An adhesive sheet was prepared in the same manner as in Example 1 except that the mixing amount of the radiation-curable resin composition was changed to 2 parts by weight (solid content).

Comparative Example 4 An adhesive sheet was prepared in the same manner as in Example 1, except that the mixing amount of the radiation-curable resin composition was changed to 30 parts by weight (solid content). The following tests were performed on the pressure-sensitive adhesive sheets of the above Examples and Comparative Examples, and the results are shown in Tables 1 and 2. (1) Suitability for lamination on a rough surface: removing a release sheet on one side of an adhesive sheet on a rough surface of a lenticular sheet (depth of fine unevenness: 50 μm), and placing the adhesive layer surface between a pair of rolls The mixture was fed and pressurized at room temperature, and the adhesive sheet and the lenticular sheet were bonded. The bonded state of the bonded pressure-sensitive adhesive sheet and the lenticular sheet was observed and evaluated based on the following criteria. ：: No air was enclosed. X: Air was enclosed.

(2) Adhesion to Acrylic Plate In Examples 1-4 and Comparative Examples 1-4, the viscosity before UV irradiation was
Viscosity after UV irradiation with 0.2 J UV light
Laminated sheets are stuck on an acrylic plate (thickness: 3mm)
After 30 minutes, the adhesive strength was measured. In Example 5,
Irradiation of electron beam 20KGy in place of UV irradiation
And the adhesive strength was measured. (3) Dynamic Storage Elasticity In Examples 1 to 4 and Comparative Examples 1 to 4,
Storage modulus G ₁’ U irradiated with 0.2 J UV light
Dynamic storage modulus G after V irradiation _Two’ And the measurement conditions to 25
° C, frequency ω = 10 rad / sec, distortion = 5%
Measured and the ratio (G _Two’ / G ₁’ ). In Example 5
Performs irradiation of electron beam 20KGy instead of UV irradiation,
Similarly, the ratio (G _Two’ / G ₁’ ) Was measured. (4) Heat resistance In Examples 1 to 4 and Comparative Examples 1 to 4, the adhered adhesive was used.
Sheet and lenticular sheet (depth of fine irregularities on rough surface)
UV irradiation (UV light irradiation amount: 0.2 μm)
J), adhesive sheet and lenticular sheet after UV irradiation
The laminate is put in a 70 ° C constant temperature bath for one week and then taken out.
To observe the state of the laminate and evaluate it based on the following criteria.
Valued. In the fifth embodiment, the electron beam 20K is used instead of the UV irradiation.
Gy irradiation was performed, and the adhesive strength was measured in the same manner. ：: No foaming, floating or swelling in appearance. X: Foaming, floating, swelling on appearance.

[0033]

[Table 1]

[0034]

[Table 2]

[0035]

When the pressure-sensitive adhesive sheet of the present invention is bonded to a rough surface of an adherend, the pressure-sensitive adhesive can penetrate deep into the fine concave portions of the rough surface to prevent air from being enclosed. Also, after irradiation, it has excellent heat resistance.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one embodiment of the pressure-sensitive adhesive sheet of the present invention.

FIG. 2 is a cross-sectional view showing a state in which one embodiment of the pressure-sensitive adhesive sheet of the present invention is bonded to a rough surface of a lenticular sheet.

[Explanation of symbols]

 Reference Signs List 1 adhesive layer 2 release sheet 3 lenticular sheet

Claims (3)

[Claims] 1. A pressure-sensitive adhesive layer containing a pressure-sensitive adhesive and a radiation-curable resin, wherein the content of the radiation-curable resin is 2.5 to 25 parts by weight based on 100 parts by weight of the pressure-sensitive adhesive. An adhesive sheet characterized by the above-mentioned. 2. The method according to claim 1, wherein the pressure-sensitive adhesive layer comprises a dynamic storage bullet before irradiation.
Sex factor G ₁’ Is 1 × 10^Four~ 1 × 10⁶dyn / cm^TwoIn
And the dynamic storage modulus G ₁’ After irradiation
Dynamic storage modulus G of _Two’ Ratio (G _Two’ / G ₁’ ) Is 1.5
The pressure-sensitive adhesive sheet according to claim 1, wherein the pressure-sensitive adhesive sheet has a property of -20. 3. A method for laminating a pressure-sensitive adhesive sheet, comprising laminating the pressure-sensitive adhesive sheet according to claim 1 on a rough surface of an adherend and irradiating radiation.