JP2849307B2 - Transparent pressure-sensitive adhesive sheet and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent pressure-sensitive adhesive sheet and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, there are the following two methods for providing a pressure-sensitive adhesive layer on a general-purpose transparent resin sheet. (1) An aqueous or organic solvent-based pressure-sensitive adhesive solution is applied to a resin sheet, which is heated and dried to form a pressure-sensitive adhesive layer, and a separator made of paper or film subjected to surface release treatment is applied to the pressure-sensitive adhesive layer. Attach to product. (2) A pressure-sensitive adhesive solution is applied to a separator, which is heated and dried to form a pressure-sensitive adhesive layer, which is pressed against a resin sheet to transfer the pressure-sensitive adhesive layer to the resin sheet.

[0003]

However, in the above method (1), since an aqueous or organic solvent-based pressure-sensitive adhesive solution is applied to the resin sheet, the sheet swells, dissolves, becomes cloudy,
There have been problems such as sheet elongation, wrinkling of the sheet, cracks and pinholes. In the above method (2), when the pressure-sensitive adhesive layer is pressed onto the resin sheet and the pressure-sensitive adhesive layer is transferred to the resin sheet, air bubbles easily enter between the pressure-sensitive adhesive layer and the sheet. As a result, the transparency of the sheet is lost and the appearance is deteriorated. Moreover, since the solid pressure-sensitive adhesive layer is pressed against the solid resin sheet, the sheet is not sufficiently wetted with the pressure-sensitive adhesive layer, bubbles are entrained, the surface is not smooth enough, and the dimensional accuracy is poor. Or the sheet is greatly distorted, defective products are easily generated, and the yield is poor.

[0004] An object of the present invention is to eliminate the need for applying an aqueous or organic solvent-based adhesive solution to a resin sheet when producing a transparent adhesive sheet. An object of the present invention is to provide a new manufacturing method that does not require transfer.

[0005]

The present invention provides a release film, a pressure-sensitive adhesive layer provided on the release film,
An ultraviolet-curable sheet comprising a cured product of a photosensitive liquid containing an ultraviolet-curable resin, wherein the adhesive layer is filled in concave portions of the ultraviolet-curable sheet.

Further, the present invention provides a method for forming a photosensitive layer comprising a photosensitive liquid containing an ultraviolet curable resin on a solid pressure-sensitive adhesive layer,
The present invention relates to a method for producing a transparent pressure-sensitive adhesive sheet, which comprises irradiating the photosensitive layer with ultraviolet rays to form an ultraviolet-curable sheet comprising a cured product of the photosensitive liquid.

In the present invention, a photosensitive layer comprising a photosensitive liquid containing an ultraviolet curable resin is formed on a smooth surface, a solid adhesive layer is brought into contact with the photosensitive layer, and the photosensitive layer is irradiated with ultraviolet rays. Accordingly, the present invention relates to a method for producing a transparent pressure-sensitive adhesive sheet, wherein an ultraviolet-curable sheet made of a cured product of the photosensitive liquid is formed, and the ultraviolet-curable sheet is peeled off from the smooth surface.

[0008]

According to the method for producing a transparent pressure-sensitive adhesive sheet of the present invention, a solid pressure-sensitive adhesive layer is brought into contact with a photosensitive layer comprising a photosensitive liquid containing an ultraviolet-curable resin, and the photosensitive layer is irradiated with ultraviolet rays. An ultraviolet curable sheet made of a cured product of the photosensitive liquid is formed.

Therefore, unlike the method of applying a water-based or organic solvent-based pressure-sensitive adhesive solution to a resin sheet, the resin sheet swells, dissolves and becomes cloudy, the resin sheet stretches, and wrinkles are generated on the resin sheet. Thus, problems such as generation of cracks and pinholes do not occur.

Also, unlike the method in which the pressure-sensitive adhesive layer is pressed onto a resin sheet and transferred to the resin sheet, no deformation or distortion occurs due to the pressure, and the dimensional accuracy is good. Moreover, since the liquid phase and the solid phase are brought into contact with each other, the UV-curable sheet wets the pressure-sensitive adhesive layer well, and the UV-curable sheet almost completely follows the unevenness of the surface of the solid pressure-sensitive adhesive layer. The transparency of the transparent pressure-sensitive adhesive sheet is high because the adhesiveness between the pressure-sensitive adhesive layer and the UV-curable sheet is good, and no air bubbles are trapped between the pressure-sensitive adhesive layer and the UV-curable sheet.

Further, according to the method for producing a long transparent pressure-sensitive adhesive sheet according to the present invention, a solid pressure-sensitive adhesive layer having a narrower width is brought into contact with a photosensitive layer composed of a photosensitive liquid containing an ultraviolet curable resin. By irradiating the photosensitive layer with ultraviolet rays, an ultraviolet-curable sheet made of a cured product of the photosensitive liquid is formed. According to this manufacturing method, a transparent pressure-sensitive adhesive sheet in which the pressure-sensitive adhesive layer is filled in the concave portion of the ultraviolet-curable sheet can be easily manufactured.

Conventionally, when the ultraviolet-curable sheet is peeled off after attaching the ultraviolet-curable sheet to the object, the adhesive often remains on the object. On the other hand, by filling the pressure-sensitive adhesive layer in the concave portion of the ultraviolet-curable sheet, the size of the pressure-sensitive adhesive layer is smaller than the size of the ultraviolet-curable sheet, and when the ultraviolet-curable sheet is peeled off, No more adhesive remained.

[0013]

Next, the present invention will be described in more detail with reference to the drawings. In the present invention, as shown in FIG. 1A, a photosensitive layer 1 made of a photosensitive liquid containing an ultraviolet curable resin is formed on a solid pressure-sensitive adhesive layer 4, and then the photosensitive layer 1 is formed.
Is irradiated with an ultraviolet ray as shown by arrow A. As a result, FIG.
As shown in (b), an ultraviolet-curable sheet 5 made of a cured product of the photosensitive liquid is formed on the pressure-sensitive adhesive layer 4.

At this time, the adhesive layer 4 is formed on the release film 3.
Then, the photosensitive layer 1 can be formed on the pressure-sensitive adhesive layer 4. Further, the photosensitive layer 1 can be formed on the pressure-sensitive adhesive layer 4, and then the release film 3 can be attached to the pressure-sensitive adhesive layer 4.

In the present invention, as shown in FIG. 2, a photosensitive layer 1 made of a photosensitive liquid containing an ultraviolet-curable resin is formed on a smooth surface 6, and a solid adhesive layer 4 is formed on the photosensitive layer 1. By bringing the photosensitive layer 1 into contact with it and irradiating the photosensitive layer 1 with ultraviolet rays, an ultraviolet-curable sheet 5 made of a cured product of the photosensitive liquid is formed. Next, the ultraviolet-curable sheet 5 is peeled off from the smooth surface 6.

At this time, the adhesive layer 4 is formed on the release film 3.
Then, the pressure-sensitive adhesive layer 4 can be brought into contact with the photosensitive layer 1. Further, the pressure-sensitive adhesive layer 4 can be brought into contact with the photosensitive layer 1, and then the release film 3 can be attached to the pressure-sensitive adhesive layer 4.

In the present invention, the thickness of the pressure-sensitive adhesive layer is not limited, but is preferably 5 to 100 μm from the viewpoint of the adhesion performance. If the thickness of the pressure-sensitive adhesive layer is less than 5 μm, the adhesive strength may be insufficient, and the transparent pressure-sensitive adhesive sheet may not be stuck properly. The thickness of the adhesive layer is 1
When it exceeds 00 μm, when the transparent pressure-sensitive adhesive sheet is peeled off, the pressure-sensitive adhesive layer may cause cohesive failure, and the pressure-sensitive adhesive may remain on the target object.

The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer may be a cured product of a water-based pressure-sensitive adhesive or an organic solvent-based pressure-sensitive adhesive, and may be an acrylic, rubber-based, or silicone-based pressure-sensitive adhesive. Desirably. If sufficient adhesive strength can be obtained for the intended use, an ultraviolet-curable adhesive or the like may be used. When the release film withstands heating, a hot-melt adhesive can be used. The color of the pressure-sensitive adhesive layer can be freely selected as long as transparency can be maintained.

When a pressure-sensitive adhesive layer is provided on a release film, it is preferable to apply a pressure-sensitive adhesive on the film. Examples of the coating apparatus in this case include coaters such as a roll coater, a comma coater, a gravure coater, a knife coater, a curtain coater, and an extrusion coater, and applicators. Also, offset printing, gravure printing, screen printing,
Using a printing machine such as flexographic printing, an adhesive layer having a predetermined planar pattern can be formed. Further, each of the above coating methods can be used in combination. The drying step of the pressure-sensitive adhesive layer can be carried out by a usual method.

As the release film, a paper or plastic separator can be used. A typical example of the release transparent film is a polyethylene terephthalate film, but a film made of another thermoplastic resin or a thermosetting resin can be used as long as it has transparency and surface smoothness. In addition, a polyethylene film or a polypropylene film that has not been subjected to a release treatment, or a film that has been subjected to a release treatment, can also be used as a release-resistant transparent film because the adhesion to the pressure-sensitive adhesive layer is extremely small.

The photosensitive liquid constituting the photosensitive layer contains, as main components, an ultraviolet curable resin and a photopolymerization initiator.
Examples of the ultraviolet curing resin include urethane acrylate resin, epoxy acrylate resin, polyester acrylate resin, ene / thiol reaction type oligomer, and cationic polymerization type oligomer.

Examples of the photopolymerization initiator include diethoxyacetophenone, 2-hydroxy-2-methyl-1.
Phenyl propane 1-one, 1- (4-isopropylphenyl) 2-hydroxy 2-methylpropane
Acetophenone-based polymerization initiators such as 1-one, 4- (2-hydroxyethoxy) -phenyl} (2-hydroxy-2-propyl) ketone, benzoin-based polymerization initiators such as benzoin, benzoin methyl ether and benzoin butyl ether; thioxanthon System polymerization initiator, methylphenylglyoxylate, benzyl, 2,4,6-trimethylbenzoyldiphenylphosphine oxide and the like. The amount of the photopolymerization initiator in 100 parts by weight of the photosensitive liquid is preferably within 5 parts by weight.

Further, for the purpose of adjusting the viscosity of the photosensitive solution, improving the physical properties, and the like, monomers such as acrylic acid ester monomers, methacrylic acid ester monomers, vinyl ester monomers, thermal polymerization inhibitors, antioxidants , An antifoaming agent, a leveling agent and the like can be added.
Further, as other additives, a colorant, a release agent, an aromatic agent, and the like can be added.

In order to form a photosensitive layer composed of a photosensitive solution on a solid pressure-sensitive adhesive layer or on a smooth surface, any of the methods used for forming the above-mentioned pressure-sensitive adhesive layer can be used. When the photosensitive layer is formed on a smooth surface, the smooth surface is preferably a metal surface in terms of ease of processing and releasability. Examples of such a metal surface include a mirror-finished stainless steel plate or roll, an infinite continuous belt, a nickel-plated or chromium-plated metal surface, and a polished metal surface is more preferable.

When the photosensitive layer is cured, an ultraviolet ray generator such as a low-pressure mercury lamp such as a chemical lamp or a black light, a high-pressure mercury lamp, or an ultra-high-pressure mercury lamp is used. The irradiation energy of the ultraviolet light is 50 mJ / cm ² ─5000 mJ / cm ²
It is preferred that

According to the production method of the present invention, as described above, a transparent pressure-sensitive adhesive sheet in which the pressure-sensitive adhesive layer is filled in the concave portions of the ultraviolet-curable sheet can be easily produced.
For example, in FIG. 3A, the ultraviolet curable sheet 5A
Is provided with an adhesive layer 4A and a release film 3A. In FIG. 3B, the adhesive layer 4B is filled in the concave portion 2B of the ultraviolet curable sheet 5B, and the release film 3B is provided on the entire surface of the ultraviolet curable sheet 5B.

That is, in the production method of the present invention, since the photosensitive layer is in the liquid phase, when the photosensitive layer is brought into contact with the solid pressure-sensitive adhesive layer, the photosensitive layer follows the shape of the pressure-sensitive adhesive layer. Deform. As a result, after the photosensitive layer is cured, the ultraviolet curing sheet has a shape in which the pressure-sensitive adhesive layer is filled in the concave portions.

Here, when a pressure-sensitive adhesive layer having a predetermined planar pattern is formed using a printing machine such as offset printing, gravure printing, screen printing, or flexographic printing, the concave pattern of the ultraviolet-curable sheet is filled with the planar pattern. Is established. In this case, the planar pattern of the pressure-sensitive adhesive layer can be freely changed. If the color of the adhesive layer and the color of the UV-curable sheet are different, the design of the transparent pressure-sensitive adhesive sheet itself must be given because the planar pattern of the pressure-sensitive adhesive layer can be seen through inside the UV-curable sheet. Can be.

The transparent pressure-sensitive adhesive sheets shown in FIGS. 4A, 4B and 4C relate to such an embodiment. FIG. 4 (a)
In the example, the concave portion 2C of the ultraviolet curable sheet 5C is filled with an adhesive layer 4C having a predetermined planar pattern, and the release film 3A is also formed in the concave portion of the ultraviolet curable sheet 5C. In the example of FIG. 4B, the concave portion 2C of the ultraviolet curable sheet 5B is filled with an adhesive layer 4D having a predetermined planar pattern.
A release film 3B is provided on the entire surface of B.

Also in the example of FIG. 4C, the concave portion 2C of the ultraviolet-curable sheet 5D is filled with an adhesive layer 4E having a predetermined planar pattern.
Is provided with a release film 3B on the entire surface of the substrate. The side edge of the pressure-sensitive adhesive layer 4E is exposed at the side edge of the transparent pressure-sensitive adhesive sheet.

Hereinafter, more specific production examples will be described. (Experimental Example 1) A transparent pressure-sensitive adhesive sheet was manufactured as shown in FIG. An A4-size polyethylene terephthalate film (thickness: 56 μm) ("PET50GS @ B" manufactured by Lintec Co., Ltd.) whose surface was silicon-treated was used as the releasing transparent film 3B.

Acrylic adhesive "SK Dyne 1428F" manufactured by Soken Chemical Co., Ltd. (viscosity 2500 CPS / 25
° C, N.I. V. 30 wt%, toluene / ethyl acetate,
Using a mixed solvent of isopropanol) on the transparent film 3B to an area of about A5 size with an applicator.
Mil was applied. This was dried at 80 ° C. for 3 minutes, returned to room temperature, and left to mature for 3 days. As a result, the thickness 28
A μm transparent pressure-sensitive adhesive layer 4B was formed.

"Shinko UV7000B" manufactured by Nippon Synthetic Chemical Company
(Urethane acrylate, high viscous material)
"Darocure 1173" manufactured by Merck (photopolymerization initiator)
1.0 part by weight was added to prepare a photosensitive solution. This photosensitive liquid was a colorless, transparent, highly viscous liquid (viscosity: 13200C).
PS / 50 ° C). This photosensitive liquid (liquid temperature of 50 ° C.) was applied to the above-mentioned pressure-sensitive adhesive layer 4B slightly more widely with an applicator to form a photosensitive layer. At this time, the total thickness of the pressure-sensitive adhesive layer 4B and the photosensitive layer was adjusted to 250 μm.

Next, ultraviolet rays were irradiated from a high-pressure mercury lamp so that the integrated light amount became 1000 mJ / cm ² . As a result, a transparent adhesive sheet having good transparency, in which the adhesive layer 4 and the ultraviolet-curable sheet 5B were integrated, was obtained. As a high-pressure mercury lamp, "ORM # 2" manufactured by Oak Manufacturing Co., Ltd.
077A "(80W / cm, 3-lamp type, lamp distance 15c
m) was used.

(Experimental Example 2) An adhesive layer 4 was formed in the same manner as in Experimental Example 1. However, as a material of the pressure-sensitive adhesive layer, an acrylic pressure-sensitive adhesive “SK Dyne E─ manufactured by Soken Chemical Co., Ltd.
3073 "(pale milky white emulsion, viscosity 350C
PS / 25 ° C., N.P. V. 65 wt%). The drying condition of the pressure-sensitive adhesive layer was set to 100 ° C. for 3 minutes, and left to mature for 7 days. As a result, a transparent pressure-sensitive adhesive layer 4 having a thickness of 60 μm was formed.

Next, an ultraviolet-curable sheet 5B was formed in exactly the same manner as in Experimental Example 1 to obtain a transparent adhesive sheet. As a result, a transparent adhesive sheet having good transparency, in which the adhesive layer 4 and the ultraviolet-curable sheet 5B were integrated, was obtained.

(Experimental example 3)
An adhesive layer 4 was formed. Next, an ultraviolet-curable sheet 5B was formed in the same manner as in Experimental Example 1 to obtain a transparent adhesive sheet. However, the composition of the photosensitive solution was as shown in Table 1.
The viscosity of the photosensitive solution was 8,500 CPS / 25 ° C.

[0038]

[Table 1] "B @ 109H" (manufactured by Kyowa Hakko Co., Ltd., urethane acrylate / 2-hydroxyethyl methacrylate = 1/1 solution, viscous liquid) 100 parts by weight 2-hydroxyethyl methacrylate 50 parts by weight Darocur 1173 "1.5 parts by weight Silicone solution for release agent" Mold with INFEQ-6 "manufactured by Kozakura Shokai Co., Ltd. 1.5 parts by weight

This photosensitive solution (solution temperature: 25 ° C.) was applied to the above-mentioned pressure-sensitive adhesive layer 4 by 9 mil using an applicator.
Was formed. Further, in order to prevent the photopolymerization from being inhibited by oxygen, the photosensitive layer 1 is covered with a transparent polyethylene terephthalate film having a thickness of 50 μm, and the total thickness is 35%.
It was adjusted to be 0 μm.

Next, ultraviolet rays were irradiated from the side of the transparent polyethylene terephthalate film having a thickness of 50 μm using the above-mentioned high-pressure mercury lamp so that the integrated light amount became 2000 mJ / cm ² . As a result, in the obtained transparent pressure-sensitive adhesive sheet, the transparency was so excellent that the boundary between the pressure-sensitive adhesive layer 4 and the ultraviolet-curable sheet 5 could not be seen.

(Experimental Example 4) A polyethylene terephthalate film (thickness: 56 μm) whose surface was silicon-treated (“PET50GS @ B” manufactured by Lintec Co., Ltd.) was coated with an ultraviolet-curable pressure-sensitive adhesive “VISCOTAC OM # 1100” (Osaka Organic Chemical Company, Ltd.). Made, transparent, slightly yellow, viscosity 1500 CPS / 25
° C) with an applicator, applying 4 mils, applying ultraviolet light with the above high pressure mercury lamp, and integrating light quantity of 3000 mJ / c.
Irradiation was performed to obtain m ² . As a result, a transparent pressure-sensitive adhesive layer 4 having a thickness of 85 μm was formed.

Next, in the same manner as in Experimental Example 3, an ultraviolet-curable sheet 5 was formed to obtain a transparent adhesive ultraviolet-curable sheet. However, the total thickness was adjusted to be 500 μm. As a result, in the obtained transparent pressure-sensitive adhesive sheet, the transparency was so excellent that the boundary between the pressure-sensitive adhesive layer 4 and the ultraviolet-curable sheet 5 could not be seen.

Experimental Example 5 As shown in FIG. 5, a transparent pressure-sensitive adhesive sheet was manufactured. The same photosensitive liquid as in Experimental Example 3 was prepared, and this photosensitive liquid was applied to the surface 6 of the ferrotype plate at 9 mil to form the photosensitive layer 1. This ferro-type plate is a stainless steel hard chrome-plated plate having a thickness of 0.5 mm, and has a mirror surface gloss ("Ferro-type plate" manufactured by Asanuma Industry Co., Ltd.).

On the other hand, the adhesive layer 4 was formed on the transparent film 3 in exactly the same manner as in Experimental Example 1. The pressure-sensitive adhesive layer 4 was brought into contact with the photosensitive layer 1 and laminated. At this time, a stainless steel rod having a diameter of 13 mm was rolled on the transparent film 3 while being rolled to prevent air bubbles from entering the boundary surface. As a result, the layers could be laminated without bubbles entering the boundary surface.

Next, using the above-mentioned high-pressure mercury lamp, ultraviolet light was applied from the transparent film 3 side to an integrated light amount of 2000 mJ /
The photosensitive layer 1 was cured by irradiating cm ² . After curing, the ultraviolet-curable sheet 5 was peeled off from the ferrotype plate. This peeling could be easily performed only by pulling up the transparent adhesive sheet by hand.

As a result, the resulting transparent pressure-sensitive adhesive sheet was excellent in transparency so that the boundary between the pressure-sensitive adhesive layer 4 and the ultraviolet-curable sheet 5 was not visible. Moreover, the gloss of the surface of the ultraviolet curable sheet 5 was excellent.

(Experimental Example 6) A transparent adhesive sheet was produced in the same manner as in Experimental Example 1. However, as shown in FIG. 4B, an adhesive layer 4D was formed on the release film 3B by screen printing. As a result, in the obtained transparent pressure-sensitive adhesive sheet, the transparency was excellent, and the pressure-sensitive adhesive layer 4D displayed a clear pattern.

[0048]

As described above, according to the present invention, the resin sheet swells, dissolves and becomes cloudy, the resin sheet stretches, wrinkles occur in the resin sheet, cracks and pinholes occur. Such a problem does not occur. In addition, deformation and distortion due to the pressing force do not occur, and the dimensional accuracy is good. Moreover, the UV curable sheet has good wettability to the pressure-sensitive adhesive layer, has good adhesion between the pressure-sensitive adhesive layer and the UV-curable sheet, and does not entrap air bubbles between the pressure-sensitive adhesive layer and the UV-curable sheet. The transparency of the transparent adhesive sheet is high.

Further, according to the method for producing a transparent pressure-sensitive adhesive sheet according to the present invention, a transparent pressure-sensitive adhesive sheet in which the pressure-sensitive adhesive layer is filled in the concave portion of the ultraviolet-curable sheet can be easily produced. . As a result, the size of the pressure-sensitive adhesive layer was smaller than the size of the UV-curable sheet, and when the UV-curable sheet was peeled off, no pressure-sensitive adhesive remained on the target object.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing a state in which a photosensitive layer 1 is irradiated with ultraviolet rays, and FIG. 1B is a cross-sectional view showing a transparent adhesive sheet.

FIG. 2 is a cross-sectional view showing a case where a photosensitive layer 1 is formed on a smooth surface 6.

FIGS. 3A and 3B are cross-sectional views each showing a transparent pressure-sensitive adhesive sheet.

FIGS. 4A, 4B, and 4C are cross-sectional views each showing a transparent pressure-sensitive adhesive sheet.

FIG. 5 is a cross-sectional view for explaining a production example of a transparent pressure-sensitive adhesive sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Photosensitive layer 2A, 2B, 2C Concave part 3, 3A, 3B Releasable film 4, 4A, 4B, 4C, 4D, 4E Adhesive layer 5, 5A, 5B, 5C, 5D UV curable sheet 6 Smooth surface A UV Example of irradiation direction

Claims (7)

(57) [Claims] 1. An ultraviolet-curable sheet comprising a release film, an adhesive layer provided on the release film, and an ultraviolet-curable sheet made of a cured product of a photosensitive liquid containing an ultraviolet-curable resin. A transparent pressure-sensitive adhesive sheet, wherein the concave portion is filled with the pressure-sensitive adhesive layer. 2. A photosensitive layer comprising a photosensitive liquid containing an ultraviolet-curable resin is formed on a solid pressure-sensitive adhesive layer, and the photosensitive layer is irradiated with ultraviolet rays, whereby an ultraviolet-curable cured product of the photosensitive liquid is formed. A method for producing a transparent pressure-sensitive adhesive sheet, comprising forming a sheet. 3. The method for producing a transparent pressure-sensitive adhesive sheet according to claim 2, wherein the pressure-sensitive adhesive layer is provided on a release film, and then the photosensitive layer is formed on the pressure-sensitive adhesive layer. 4. The photosensitive layer is formed on the pressure-sensitive adhesive layer,
The method for producing a transparent pressure-sensitive adhesive sheet according to claim 2, wherein a release film is adhered to the pressure-sensitive adhesive layer. 5. A photosensitive layer comprising a photosensitive liquid containing an ultraviolet-curable resin is formed on a smooth surface, a solid pressure-sensitive adhesive layer is brought into contact with the photosensitive layer, and the photosensitive layer is irradiated with ultraviolet rays. A method for producing a transparent pressure-sensitive adhesive sheet, comprising forming an ultraviolet-curable sheet made of a cured product of a liquid and peeling the ultraviolet-curable sheet from the smooth surface. 6. The method for producing a transparent pressure-sensitive adhesive sheet according to claim 5, wherein the pressure-sensitive adhesive layer is provided on a release film, and then the pressure-sensitive adhesive layer is brought into contact with the photosensitive layer. 7. The pressure-sensitive adhesive layer is brought into contact with the photosensitive layer,
The method for producing a transparent pressure-sensitive adhesive sheet according to claim 5, wherein a release film is adhered to the pressure-sensitive adhesive layer.