JP2021021053A - Pressure sensitive adhesive sheet for visible light transmitting surface, pressure sensitive adhesive sheet for visible light transmitting surface having detachable base material sheet, and laminate - Google Patents

Abstract

To provide a pressure sensitive adhesive sheet for a visible light transmitting surface, configured to be adhered into a visible light transmitting material as represented by a window material, capable of exerting a specific function by a functional layer, while allowing an easy removal without an adhesive residue.SOLUTION: A pressure sensitive adhesive sheet for a visible light transmitting surface is to be adhered onto a surface of a visible light transmitting material. The pressure sensitive adhesive sheet for a visible light transmitting surface includes a functional layer and an adhesive layer. The adhesive layer has a plurality of concave shapes on both sides thereof.SELECTED DRAWING: Figure 1

Description

The present invention relates to an adhesive sheet for a visible light transmitting surface, an adhesive sheet for a visible light transmitting surface with a peelable base material sheet, and a laminate in which an adhesive sheet for a visible light transmitting surface and a visible light transmitting material are laminated. ..

Conventionally, a UV cut sheet, an infrared absorbing sheet, or a sheet having some other function is attached to a window material of a house, an office, or a transportation device (automobile, railroad vehicle, ship, aircraft, etc.), and the above function is applied to the window material. Is being given. For example, Patent Document 1 discloses an ultraviolet absorbing film having an adhesive layer.

Then, in Patent Document 2, in consideration of the fact that the wallpaper once pasted can be easily peeled off, a microporous, that is, microporous adhesive layer is formed on the back surface of the wallpaper made of vinyl chloride resin to exert a micro suction cup action. A simple detachable wallpaper used has been proposed. Further, Patent Document 3 discloses an adhesive layer using an acrylic emulsion.

Japanese Unexamined Patent Publication No. 2003-112391 Registered Utility Model No. 3018809 Japanese Unexamined Patent Publication No. 2017-036404

The pasting of the above sheet in Patent Document 1 does not take into consideration the fact that the sheet once peeled off is replaced with another place, or another sheet is newly pasted at the place where the sheet is peeled off (reworkability). Absent. Therefore, when the sheet is peeled off from the window material or the like, the sheet is usually damaged or adhesive residue is usually generated on the window material. The adhesive residue generated on the window material is unacceptable as compared with the adhesive residue generated on the wall surface in terms of its conspicuity and ugliness.

On the other hand, the simple detachable wallpaper of Patent Document 2 is merely a wallpaper, and does not exhibit each of the above functions by being attached to a window material like the above sheets. Further, since it is not supposed to be attached to the window material, an appropriate adhesive force to the surface of the window material, that is, an adhesive force that does not peel off unintentionally and can be easily peeled off without adhesive residue can be obtained. It seems unlikely. Moreover, since the use for the window material is not considered, it is considered that the transmission of visible light of the adhesive layer is not considered.

From the above, the object of the present invention is visible, which is attached to a visible light transmitting material such as a window material, can exhibit a specific function by the functional layer, and can be easily peeled off without adhesive residue. It is an object of the present invention to provide a pressure-sensitive adhesive sheet for a light-transmitting surface, a pressure-sensitive adhesive sheet for a visible light-transmitting surface with a removable base material sheet, and a laminate in which a pressure-sensitive adhesive sheet for a visible light-transmitting surface and a visible light-transmitting material are laminated.

The pressure-sensitive adhesive sheet for a visible light transmitting surface of the present invention is a pressure-sensitive adhesive sheet for a visible light transmitting surface to be attached to the surface of a visible light transmitting material, and has a functional layer and an adhesive layer. It is an adhesive sheet for visible light transmitting surfaces having a plurality of concave shapes on both sides thereof.

The pressure-sensitive adhesive sheet for a visible light transmitting surface may have a visible light transmittance of 5% or more.

The adhesive sheet for a visible light transmitting surface may have at least one of the outer shape in a plan view and the hollowed shape of the adhesive sheet for a visible light transmitting surface having a design property as a shape.

In the pressure-sensitive adhesive sheet for visible light transmitting surfaces, the functional layer may be an ultraviolet absorbing layer.

In the adhesive sheet for a visible light transmitting surface, the functional layer may be an infrared absorbing layer.

In the adhesive sheet for a visible light transmitting surface, the functional layer may be colored in a chromatic color.

In the adhesive sheet for a visible light transmitting surface, even if the functional layer has a plurality of regions having different hues and the boundary of the plurality of regions has a region having a lightness or a transmittance lower than that of the plurality of regions. Good.

In the adhesive sheet for a visible light transmitting surface, the functional layer may have a function of reflecting a part of the incident light and transmitting the other part.

In the pressure-sensitive adhesive sheet for visible light transmitting surfaces, at least one of the functional layer and the pressure-sensitive adhesive layer may be a light diffusion-transmitting layer.

In the adhesive sheet for a visible light transmitting surface, the functional layer may have a function of narrowing the viewing angle and reducing the visibility from an angled direction from the front.

In the pressure-sensitive adhesive sheet for a visible light transmitting surface, the functional layer includes a layer in which a non-woven fabric is impregnated with ink, and the non-woven fabric may have fibers or fiber lumps dispersed in the texture.

In the pressure-sensitive adhesive sheet for a visible light transmitting surface, the functional layer may include a light-shielding layer, and the light-shielding layer may have a large number of through holes.

In the adhesive sheet for visible light transmitting surfaces, the brightness of the functional layer on the surface side facing the adhesive layer is higher than the brightness on the surface side opposite to the surface side facing the adhesive layer. May be good.

In the adhesive sheet for visible light transmitting surfaces, the average value of the diameters of the concave openings opened on one surface of the adhesive layer is set to ^Dave _1, and the concave openings opened on the other surface of the adhesive layer. When the average value of the diameter of the part is D ^ave ₂ ,
｜ D ^ave ₁ − D ^ave ₂ ｜ / D ^ave ₂ ≤ 0.5
The relationship may be satisfied.

The pressure-sensitive adhesive sheet for a visible light transmitting surface with a peelable base sheet of the present invention further has a peeling base sheet on the surface of the pressure-sensitive adhesive sheet for a visible light transmitting surface on the pressure-sensitive adhesive layer side.

The laminate of the present invention is a laminate of the pressure-sensitive adhesive sheet for a visible light transmitting surface and the visible light transmitting material.

According to the present invention, a visible light transmitting surface that is attached to a visible light transmitting material such as a window material, can exhibit a specific function by a functional layer, and can be easily peeled off without adhesive residue. It is possible to provide a pressure-sensitive adhesive sheet for use, a pressure-sensitive adhesive sheet for a visible light transmitting surface with a peelable base material sheet, and a laminate in which a pressure-sensitive adhesive sheet for a visible light transmitting surface and a visible light transmitting material are laminated.

The figure which shows the outline of the cross section of (a) the pressure-sensitive adhesive sheet for a visible light transmitting surface and (b) the pressure-sensitive adhesive sheet for a visible light transmitting surface with a peelable base material sheet which concerns on 1st Embodiment of this invention. The figure which sequentially shows the form at the time of use of the adhesive sheet for a visible light transmitting surface of this invention, and the adhesive sheet for a visible light transmitting surface with a peelable base material sheet. The figure which shows the manufacturing apparatus of the adhesive sheet for a visible light transmitting surface with a peelable base material sheet of this invention. The figure explaining the manufacturing method of the adhesive sheet for a visible light transmitting surface with a peelable base material sheet of this invention. The figure which shows the peeling force of an Example and a comparative example. It is a figure explaining (a) external shape, (b) hollow shape in the adhesive sheet for a visible light transmitting surface of this invention. The figure which shows the outline of the cross section of (a) the pressure-sensitive adhesive sheet for a visible light transmitting surface and (b) the pressure-sensitive adhesive sheet for a visible light transmitting surface with a peelable base material sheet which concerns on 2nd Embodiment of this invention. The figure which shows the outline of the cross section of (a) the pressure-sensitive adhesive sheet for a visible light transmitting surface and (b) the pressure-sensitive adhesive sheet for a visible light transmitting surface with a peelable base material sheet which concerns on 3rd Embodiment of this invention. The figure which shows the outline of the cross section of (a) the pressure-sensitive adhesive sheet for a visible light transmitting surface and (b) the pressure-sensitive adhesive sheet for a visible light transmitting surface with a peelable base material sheet which concerns on 4th Embodiment of this invention. Outline of the cross section of the laminated body which concerns on (a) 1st Embodiment of this invention, (b) 2nd Embodiment, (c) 3rd Embodiment, (d) 4th Embodiment of this invention. The figure which shows.

[Adhesive sheet for visible light transmitting surface, adhesive sheet for visible light transmitting surface with peelable base sheet]
Hereinafter, the pressure-sensitive adhesive sheet 1 for a visible light transmitting surface and the pressure-sensitive adhesive sheet 2 for a visible light transmitting surface with a peelable base material sheet of the present invention will be described with reference to FIGS. 1 and 2. It should be noted that each of the figures shown below is a diagram schematically shown, and the size, shape, thickness, etc. of each part are appropriately exaggerated or simplified for easy understanding. In addition, configurations that are not directly related to the explanation are omitted as appropriate. In each of the following figures, the same parts are designated by the same reference numerals, and some detailed description may be omitted.

Further, in the following description, specific numerical values, shapes, materials and the like will be described, but these can be changed as appropriate.

In this specification, terms such as board, sheet, and film are used, but these are generally used in the order of thickness, board, sheet, and film. It is used in the book as well. However, since there is no technical meaning in such proper use, these words can be replaced as appropriate.

The adhesive sheet 1 for a visible light transmitting surface according to the present invention has at least a functional layer 15 and an adhesive layer 12, and the adhesive layer 12 has a plurality of concave shapes on both sides thereof, and is a house. It is attached to the surface 20s (see FIG. 2C) of the visible light transmitting material 20 as typified by a window material of an office or transportation equipment. Here, examples of the visible light transmitting material 20 to which the pressure-sensitive adhesive sheet 1 for a visible light transmitting surface of the present invention is attached to the surface include the following.
(1) Window materials for walls, ceilings, floors, etc. of various buildings such as houses, offices, shops, and hospitals.
(2) Window materials for doors, doors, doors, shoji screens, bran (fusuma), etc.
(3) Doors for furniture such as chests of drawers, cupboards, kitchen furniture, sinks, TV stands, and window materials for walls.
(4) Window materials for transportation equipment such as automobiles, railroad vehicles, ships, aircraft, and spacecraft (windshields, side window window materials (guest room window window materials), etc.).
(5) Fences, temporary enclosures for construction, etc. that have the following visible light transmission.

The window in which each of the above window materials is used may be a window that can be opened and closed, or a window that cannot be opened and closed, such as a dead-end window or a FIX window. The window materials include not only transparent materials but also visible light transmitting materials for light that are not normally recognized as window materials, such as frosted glass for sliding doors and glass blocks used for public toilets. It shall be.

The visible light transmittance 20 in the present invention may be any material having a visible light transmittance that is visually visible, and usually refers to a window material or the like having a visible light transmittance of 5% or more. To do.
(First Embodiment)
FIG. 1A is an outline of a cross section of the adhesive sheet 1 for a visible light transmitting surface according to the first embodiment of the present invention, and FIG. 1 is an outline of a cross section of an adhesive sheet 2 for a visible light transmitting surface with a peelable base material sheet. Shown in (b). As shown in FIG. 1A, the adhesive sheet 1 for the visible light transmitting surface is laminated in the order of the adhesive layer 12 and the functional layer 15 from the lower side. As shown in FIG. 1B, the adhesive sheet 2 for a visible light transmitting surface with a peelable base sheet is laminated in the order of the peelable base sheet 11, the adhesive layer 12, and the functional layer 15 from the bottom. In each of the sheets 1 and 2, another layer may be provided between the layers (sheets), and for example, between the functional layer 15 and the adhesive layer 12, if necessary, these layers may be provided. It may have a primer layer for strengthening or weakening the adhesive force between both layers. The peelable base material sheet 11 is peeled off when the pressure-sensitive adhesive sheet 2 for a visible light transmitting surface with a peelable base material sheet is attached to the surface 20s of the visible light transmitting material. Therefore, the peelable base sheet 11 is present in the adhesive sheet 2 for the visible light transmitting surface with the peelable base sheet, which is in a state before being attached to the surface 20s of the visible light transmitting material, but is made of the visible light transmitting material. It does not already exist in the adhesive sheet 1 for the visible light transmitting surface in the state of being attached to the surface 20s.

The pressure-sensitive adhesive sheet 1 for a visible light transmitting surface preferably has a visible light transmittance of 5% or more. Here, the visible light transmittance is determined in accordance with JIS A5759: 2008. This is because each function of each functional layer 15 described later does not exert a function (effect) unless the adhesive sheet 1 for a visible light transmitting surface transmits visible light to some extent. That is, since the adhesive sheet 1 for the visible light transmitting surface has a visible light transmittance of 5% or more, each function of each functional layer 15 described later can be effectively exhibited.

However, even the adhesive sheet 1 for a visible light transmitting surface may preferably have a visible light transmittance of less than 5%. For example, the adhesive sheet 1 for a visible light transmitting surface that hardly transmits visible light (the visible light transmittance is less than 5%) is functionally a light-shielding sheet, and such an adhesive sheet 1 for a visible light transmitting surface is used. If it is attached to almost the entire surface 20s of the window material (visible light transmitting material), the room can be darkened even in the daytime in a room with a window, and can be used as a projection room or a dark room, for example. Further, as will be described later, the adhesive sheet 1 for the visible light transmitting surface can be easily peeled off and reattached, so that it can be used like a light-shielding curtain. In addition, it is partially attached to the front window material (windshield), rear side window, side window, skylight, and other window materials of transportation equipment such as automobiles, railroad vehicles, ships, aircraft, and spaceships, and is used by passengers and passengers. On the other hand, it can also be used as a sun visor to reduce the glare of direct sunlight. Further, the adhesive sheet 1 can be attached to the entire surface of the window material for the window material other than the window portion that secures the visibility of the driver, the steerer, or the operator. As described above, even when the visible light transmittance is less than 5%, the advantage of the adhesive sheet 1 for the visible light transmitting surface in the present invention that the reworkability is good can be utilized.

The adhesive layer 12 is laminated on one surface of the functional layer 15 (lower side in FIGS. 1A and 1B), and has an adhesive force against the surface 20s of the window material (visible light transmitting material). Is. The adhesive layer 12 includes a plurality of concave shapes 12a1 and 12a2 opened on both sides thereof.

Here, among the concave shapes that open on the surface of the adhesive layer 12, the opening that opens on the side where the functional layer 15 exists is called 12a1, and the opening on the side opposite to the side where the functional layer 15 exists. The opening to be opened is referred to as 12a2. Furthermore, when both openings 12a1 and 12a2 are generically referred to, they are also simply referred to as openings 12a.

Further, the adhesive layer 12 has elasticity, and since the plurality of concave shapes 12a1 and 12a2 each act as a fine suction cup, the adhesive force (adhesive force) is applied to the surface 20s of various visible light transmitting materials. It can be exerted (see FIG. 2 (c)).

The adhesive layer 12 is formed by, for example, a production method described later using a liquid resin composition (acrylic emulsion) disclosed in Patent Document 3. In particular, it is preferable to use a one-component curable acrylic resin. In the case of the one-component curing type, unlike the two-component curing type, the problem of difficulty in peeling due to the progress of curing in a heated environment and the increase in adhesive strength and the generation of adhesive residue when peeled is unlikely to occur. Further, in the case of the two-component curing type, the degree of increase in adhesive strength with time after application is large as compared with the one-component curing type, and there tends to be a problem that it becomes difficult to peel off with the passage of time. Further, there is also a problem that the productivity as a decorative sheet is poor, for example, it is necessary to cure at 40 ° C. for 3 days in order to stabilize the curing after application. On the other hand, in the case of the one-component curing type, since the degree of adhesive strength increasing with time after pasting is small, the problem that it becomes difficult to peel off with the passage of time does not occur, and curing is not required, so that productivity is improved. The problem of badness can also be avoided.

As described above, the pressure-sensitive adhesive sheet 1 for a visible light transmitting surface preferably has a visible light transmittance of 5% or more in a layer structure including the pressure-sensitive adhesive layer 12. From this point of view, it is preferable that the adhesive layer 12 has a high visible light transmittance. This is because the adjustment of the visible light transmittance as the adhesive sheet 1 for the visible light transmitting surface can be considered as a part of the function of the functional layer 15, and the adjustment is easier if the adjustment is made by the functional layer 15. Further, when the visible light transmittance of the adhesive layer 12 is low, the functional layer 15 is required to have a high visible light transmittance in relation to the visible light transmittance required for the adhesive sheet 1 for the visible light transmitting surface. It is not preferable because the range of choices regarding the material and structure of the functional layer 15 and the functions derived from them is narrowed. The visible light transmittance of the pressure-sensitive adhesive layer 12 obtained by curing the acrylic emulsion is preferable as the pressure-sensitive adhesive layer 12 used for the pressure-sensitive adhesive sheet 1 for a visible light-transmitting surface.

The layer thickness t of the adhesive layer 12 is preferably 1 μm or more and 500 μm or less. If it is less than the lower limit of the layer thickness range, it becomes difficult to form the concave shape, or the size of the concave shape becomes too small, and the adhesive (adsorption) property deteriorates. Further, when the upper limit value of the above layer thickness range is exceeded, the visible light transmittance of the adhesive sheet for the visible light transmitting surface becomes low, the selection range of the functional layer becomes narrow, the flexibility is lowered, and the workability is deteriorated. There are harmful effects such as.

Further, in order to evenly provide the concave shapes 12a1 and 12a2 on both surfaces of the adhesive layer 12, it is desirable that the layer thickness t of the adhesive layer 12 is in the range of 20 μm ≦ t ≦ 80 μm. This point will be described later.

The size and density of the concave shapes 12a (12a1 and 12a2) of the adhesive layer 12 can be adjusted by changing various conditions in the manufacturing process described later. For example, the adhesive layer 12 can use the density of the adhesive layer 12 as an index indicating the degree to which the concave shape 12a is included. The density of the adhesive layer 12 can be, for example, 0.1 g / cm ³ or more and 0.6 g / cm ³ or less. Further, the size of the concave shape 12a can be, for example, 1 μm or more and 300 μm or less.

In the pressure-sensitive adhesive sheet 2 for a visible light transmitting surface with a peelable base material sheet, the peelable base material sheet 11 is laminated on the side opposite to the functional layer 15 of the pressure-sensitive adhesive layer 12 (lower side in FIG. 1B). There is. The peelable base material sheet 11 is provided in consideration of handleability until the pressure-sensitive adhesive sheet 2 for a visible light transmitting surface with a peelable base material sheet is used, and the visible light transmitting with a peelable base material sheet is transmitted. When the surface adhesive sheet 2 is used, it is peeled off when the visible light transmitting surface adhesive sheet 1 is attached to the surface 20s of the visible light transmitting material 20. As the releaseable base sheet 11, various forms such as a conventionally known release film, separate paper, separate film, separate paper, release film, and release paper can be appropriately used. For example, high-quality paper, coated paper, impregnated paper, plastic film, or the like having a release layer formed on one side or both sides may be used. The release layer is not particularly limited as long as it is a material having releasability, but for example, silicone resin, organic resin modified silicone resin, fluororesin, aminoalkyd resin, melamine resin, acrylic resin, polyester resin and the like. Can be mentioned. As these resins, any of emulsion type, solvent type and solvent-free type can be used. When a release film provided with a release layer is used, for example, a silicone release type PET (polyethylene terephthalate) film, an untreated PET film, a PP film, a silicone release type paper, or the like can be used.

Although it has been explained above that the pressure-sensitive adhesive sheet 1 for a visible light transmitting surface preferably has a visible light transmittance of 5% or more, the pressure-sensitive adhesive sheet 1 for a visible light transmitting surface includes a peelable base sheet 11 as its configuration. Since it is not contained, the visible light transmittance of the peelable base sheet 11 is irrelevant.

The thickness of the peelable base sheet 11 is preferably, for example, 10 μm or more and 100 μm or less, and more preferably 20 μm or more and 60 μm or less. If it is less than the lower limit of the layer thickness range, there is no stiffness and it becomes difficult to peel off. Further, if the upper limit value of the layer thickness range is exceeded, the stiffness is too strong and the workability at the time of sticking is lowered.

Further, as the peelable base sheet 11, a commercially available one may be used. For example, a polyester film having a thickness of 38 μm in which one side is easily peeled with a silicone-based release agent (Mitsui Chemicals Tohcello Co., Ltd.) Manufactured, trade name: SP-PET-01) and the like.

Further, as described above, the pressure-sensitive adhesive sheet 1 for a visible light transmitting surface according to the present invention can be peeled off from the surface of the visible light transmitting material 20 without being damaged, and can be reused. In the case of reuse, after peeling from the surface of the visible light transmitting material 20, the peelable base sheet 11 is laminated again to form the adhesive sheet 2 for the visible light transmitting surface with the peelable base sheet again. It can also be stored until it is reused.

FIG. 2 is a diagram sequentially showing a form of the adhesive sheet 2 for a visible light transmitting surface with a peelable base sheet when used.

As shown in FIG. 2A, the above-mentioned pressure-sensitive adhesive sheet 2 for a visible light transmitting surface with a peelable base material sheet includes the peelable base material sheet 11. When the adhesive sheet 2 for a visible light transmitting surface with a peelable base sheet is attached to the surface 20s of the visible light transmitting material 20, the peeling base sheet 11 is peeled off to obtain the state of the adhesive sheet 1 for a visible light transmitting surface. (Fig. 2 (b)). Then, the exposed adhesive layer 12 is attached to the surface 20s of the visible light transmitting material 20 and an appropriate pressure is applied to the surface, whereby the concave shapes 12a existing on the exposed surface of the adhesive layer are elastically deformed. It is adsorbed (adhesive) to the surface 20s of the visible light transmitting material 20 by the same action as that of the conventional micro suction cup (FIG. 2 (c)).

That is, due to the elastic deformation around the concave shape 12a, a force that tries to return from the deformed state to the original shape acts on the concave shape 12a. Due to this force, the closed space in the concave shape 12a becomes a negative pressure, and the visible light transmitting material 20 is adsorbed on the surface 20s. Although the suction force of the concave shape 12a alone is weak, the necessary suction force can be secured as a whole because a large number of concave shapes 12a are formed. Further, when the adhesive layer 12 is manufactured, the adhesive force (adhesive force) of the adhesive layer 12 can be adjusted by adjusting the amount including the concave shape 12a with, for example, the density as a parameter.

Next, a method for manufacturing the pressure-sensitive adhesive sheet 2 for a visible light transmitting surface with a peelable base material sheet will be described.

FIG. 3 is a diagram showing a manufacturing apparatus for an adhesive sheet 2 for a visible light transmitting surface with a peelable base material sheet.

FIG. 4 is a diagram illustrating a method for manufacturing an adhesive sheet 2 for a visible light transmitting surface with a peelable base material sheet.

In order to manufacture the pressure-sensitive adhesive sheet 2 for a visible light transmitting surface with a peelable base sheet, first, the composition of the acrylic emulsion disclosed in Patent Document 3 for forming the pressure-sensitive adhesive layer 12 is put into a stirrer 31. , While stirring while mixing nitrogen gas into this composition via the pipe 32, the bubble B is contained in the composition to prepare the bubble-containing composition 120 (P1: whipping step in the figure).

Next, the bubble-containing composition 120 is coated on the peelable base material sheet 11 by the coating apparatus 33 (P2 in the figure: coating step). In the coating step, for example, the comma coater 33 can be used as the coating apparatus (coating unit), but other known coating methods may be used.

After the bubble-containing composition 120 is coated on the peelable base sheet 11, the bubble-containing composition 120 is heated by passing the peelable base sheet 11 coated with the bubble composition 130 into the drying apparatus 34. While drying, the adhesive layer 12 is formed (P3 in the figure: drying step). In the drying step, for example, a drying furnace having an internal atmospheric temperature of about 60 ° C. to 140 ° C. can be used. As the drying time, for example, about 30 seconds to 10 minutes can be exemplified. Further, in the drying step, drying may be promoted while blowing high-temperature air at a predetermined temperature to the bubble-containing composition 120. Further, other drying methods such as infrared radiation and dielectric heating can also be adopted. By performing the drying step, a large number of concave shapes 12a (that is, 12a1 and 12a2) are formed on both surfaces of the bubble-containing composition 120, and the adhesive layer 12 is formed. The concave shape 12a is formed by breaking bubbles contained in the bubble-containing composition 120 and leaving a part of the shape of the bubbles. Here, if the bubbles burst in a state where the bubble-containing composition 120 is insufficiently cured, the concave shape 12a is unlikely to remain. On the other hand, if the bubble-containing composition 120 is cured before the bubbles burst, the concave shape 12a may not be formed. Therefore, it is desirable that the drying step is performed under the condition that the foam is broken while the bubble-containing composition 120 is cured to some extent. Therefore, the temperature and the amount of air blown in the drying step have a great influence on the state of the concave shape 12a.

After forming the adhesive layer 12 on the peelable base sheet 11 by the drying step, the functional layer 15 separately prepared is bonded to the adhesive layer 12 by using the laminating device 35 (P4: laminating step in the figure). In this laminating step, since laminating is performed by the adsorption force (adhesive force) of the concave shape 12a of the adhesive layer 12, heating is not required, and bonding is possible with only a slight pressing force. Therefore, the functional layer 15 is not damaged.

When the laminating step is completed, the adhesive sheet 2 for a visible light transmitting surface with a peelable base material sheet is completed. Further, as described above, the adhesive sheet 1 for a visible light transmitting surface is a peelable base sheet 11 peeled off from the adhesive sheet 2 for a visible light transmitting surface with a peelable base sheet.

As described above, in the production of the pressure-sensitive adhesive sheet 2 for the visible light transmitting surface with the peelable base material sheet of the present embodiment, the functional layer 15 is not damaged by heat when the pressure-sensitive adhesive layer 12 is formed, and the peelable base material sheet is not damaged. The pressure-sensitive adhesive sheet 2 for a visible light transmitting surface can be efficiently manufactured. The pressure-sensitive adhesive sheet 2 for a visible light transmitting surface with a peelable base sheet may then be wound into a roll or cut to a required size.

Next, an example of actually producing the pressure-sensitive adhesive sheet 2 for a visible light transmitting surface with a peelable base material sheet of the present embodiment will be shown, and the results of comparison with the comparative example will be described.

In the adhesive sheet 2 for a visible light transmitting surface with a peelable base sheet of the example, a clearance (coating gap) of 200 μm is provided on a biaxially stretched PET film having releasability as the peelable base sheet 11. The bubble-containing composition 120 that had been subjected to the whipping step was applied using the included comma coater. This was dried in a drying oven at 100 ° C. for 1 minute to form an adhesive layer 12, and the functional layer 15 was laminated to obtain an adhesive sheet 2 for a visible light transmitting surface with a peelable base sheet according to the example. ..

The density of the adhesive layer 12 in the examples was 0.39 g / cm ³ , and the thickness was 50 μm. Further, when the surface and the cross section were enlarged and observed, it was confirmed that a large number of concave shapes 12a were formed on both surfaces of the adhesive layer 12.

As Comparative Example 1, a pressure-sensitive adhesive sheet for a visible light transmitting surface with a peelable base material sheet was obtained by producing in the same manner as in the above-mentioned Example except that the whipping step was not performed. The density of the adhesive layer after preparation was 0.87 g / cm ³ , and the thickness was 100 μm.

As Comparative Example 2, an adhesive layer was prepared using SK2094 manufactured by Soken Chemical Co., Ltd., which is an acrylic resin, and an adhesive sheet for a visible light transmitting surface with a peelable base sheet (referred to as acrylic adhesive A type) was obtained.

As Comparative Example 3, an adhesive layer was prepared using SK1502C manufactured by Soken Chemical Co., Ltd., which is an acrylic resin, and an adhesive sheet for a visible light transmitting surface with a peelable base sheet (referred to as acrylic adhesive B type) was obtained.

The peeling powers of the above four types of adhesive sheets for visible light transmitting surfaces with a peelable base material sheet were compared.

FIG. 5 is a diagram showing peeling force of Examples and Comparative Examples.

The peeling force in FIG. 5 is the result of measuring the peeling force at that time by performing 180 ° peeling at a tensile speed of 300 mm / min using a tensile tester. The peeling force was measured immediately after pasting (0 hours) and 1000 hours after pasting.

In the examples, it can be seen that the peeling force can be relatively small both immediately after the sticking and after 1000 hours have passed. With this level of peeling force, it will not peel off naturally, and it can be easily peeled off by applying force to peel it off. Therefore, the adhesive sheet 1 for the visible light transmitting surface can be peeled off without being damaged, and can be reused such as being attached to another place. Moreover, since the adsorption is performed by the concave shape 12a, the adhesive layer 12 does not remain on the surface 20s of the visible light transmitting material 20 after peeling, and the adhesive force (peeling force) of the adhesive layer 12 itself does not substantially change. It was almost nonexistent and could be re-pasted.

In Comparative Example 1, when the area is small, the peeling force can be relatively small, but when the area is large, a certain amount of force is required for the peeling. In addition, after peeling, the adhesive layer remained on the surface of the adherend, and complete reattachment was impossible.

In Comparative Example 2, when the area is large, a certain amount of force is required for peeling, and it is possible to peel off immediately after pasting, but after 1000 hours, the peeling force is significantly increased. However, it was difficult to peel it off manually, and if it was forcibly peeled off, the adhesive sheet for the visible light transmitting surface might be damaged.

In Comparative Example 3, the peeling force was large immediately after the sticking, and it was difficult to peel it by hand, or the adhesive sheet for the visible light transmitting surface might be damaged if it was forcibly peeled off.

Further, both Comparative Example 2 and Comparative Example 3 are suitable for reattachment because a part of the adhesive material remains on the surface of the visible light transmitting material or the adhesive strength is lowered after the peeling. I wasn't.

(Verification experiment on concave shape 12a of adhesive layer 12)
As described above, in the present invention, the concave shape 12a of the adhesive layer 12 has a great influence on the adhesive force. If the concave shape 12a is not evenly provided on both surfaces of the adhesive layer 12, the adhesive force (adhesive force) of one surface of the adhesive layer may be lower or increased as compared with the other surface. Further, since the concave shape 12a is evenly provided on both surfaces of the adhesive layer 12, the physical properties of the adhesive layer 12 become homogeneous, and the functional layer and the peelable base material sheet, or the functional layer and the visible light transmitting material can be used. It is also preferable in terms of exhibiting sufficient adhesive strength to both of the above and removability with the visible light transmitting material.

In order to evenly provide the concave shape 12a on both surfaces of the adhesive layer 12, it is important to control the coating amount (layer thickness t) of the adhesive layer 12. In this regard, Patent Document 3 does not consider anything, and it is sufficient that a micro suction cup is simply formed. In Patent Document 3, a fine suction cup structure is formed in a portion shown as a surface having a micro suction cup in FIG. 2 of Patent Document 3, which is a cross-sectional photograph of Example 1 formed with a WET thickness of 800 μm. However, in the part shown as the surface peeled off from the glass substrate, a structure that seems to be a huge bubble that cannot be compared with the fine suction cup structure can be confirmed. That is, in the configuration of Patent Document 3, a micro suction cup (corresponding to the concave shape 12a in the present embodiment) is formed on one surface of the adhesive layer, but a micro suction cup (concave shape 12a) is formed on the other surface. Is not roughly formed.

This point was also verified by the applicant.

As a verification experiment, samples of four types of adhesive layers were prepared, and the concave shapes 12a on both sides were observed by SEM. The samples are the following four types.

Sample 1: Adhesive layer thickness t = 25 μm
Sample 2: Adhesive layer thickness t = 40 μm
Sample 3: Adhesive layer thickness t = 60 μm
Sample 4: Adhesive layer thickness t≈2000 μm
The layer thickness of the adhesive layer in the above sample is the layer thickness after drying. Further, for Samples 1 to 3, the glass surface was coated with the bubble-containing composition after the whipping treatment using a coater, and the drying treatment was performed using a drying oven at 100 ° C. Sample 4 was drip-coated on a glass surface and naturally dried at room temperature (room temperature 20 ° C.). The drying conditions for Sample 4 were changed in order to verify the description in Patent Document 3 that normal temperature drying is sufficient. In each sample, the density of the adhesive layer after the whipping treatment was 0.4 g / cm ³ .

It was confirmed that the fine concave shapes 12a1 and 12a2 were evenly formed on both sides of the samples 1 to 3 in which the layer thickness t of the adhesive layer was controlled and heat-dried.

On the other hand, in the sample 4 having a thick film thickness and dried at room temperature, an extreme difference in the sizes of the concave shapes 12a1 and 12a2 was observed between the dried surface and the glass side surface, which was the same as FIG. 2 of Patent Document 3. The result was obtained.

Therefore, in order to evenly provide the concave shape 12a on both surfaces of the adhesive layer 12, it is desirable that the layer thickness t of the adhesive layer 12 is in the range of 20 μm ≦ t ≦ 80 μm, preferably 20 μm ≦ t ≦ 60 μm. I can judge.

Here, regarding the state in which the concave shape 12a is evenly provided on both surfaces of the adhesive layer 12, it is desirable to satisfy the following relationship in more detail.

The average value of the diameters of each opening of the concave shape 12a1 opening on the surface on the functional layer side is set to ^Dave _1, and the average value of the diameters of each opening of the concave shape 12a2 opening on the surface on the peelable base sheet side is defined as ^Dave _1. When it is set to D ^ave ₂ ,
｜ D ^ave ₁ − D ^ave ₂ ｜ / D ^ave ₂ ≤ 0.5
It is desirable to satisfy the relationship of. Also,
｜ D ^ave ₁ − D ^ave ₂ ｜ / D ^ave ₂ ≤ 0.25
It is even more desirable to satisfy the relationship.

By satisfying these relationships, it is possible to reduce the difference in adhesive strength between both sides of the adhesive layer, and it is sufficient for both the functional layer and the peelable base material sheet or the functional layer and the visible light transmitting material. Adhesive strength and re-peelability with visible light transmitting material can be satisfactorily exhibited.

By reducing the difference in adhesive strength between both sides of the adhesive layer in this way, the convenience of the adhesive sheet 1 for visible light transmitting surfaces can be significantly improved. That is, since there is no difference in the adhesive strength on both sides of the adhesive layer, it becomes easy to adjust the necessary adhesive strength according to the specific usage pattern of the adhesive sheet 1 for the visible light transmitting surface. For example, when the adhesive force between the visible light transmitting material and the adhesive layer to which the adhesive sheet 1 for the visible light transmitting surface is attached is strong, the functional layer 15 and the adhesive layer 12 are peeled off when the adhesive sheet 1 for the visible light transmitting surface is peeled off. There is a risk of peeling at the interface with. In such a case, it is possible to easily adjust the balance of the adhesive force by performing a primer treatment on the visible light transmitting material side in advance to weaken the adhesive force.

Since it is practically impossible to obtain the average value of the diameters of each opening as the average value of all the openings, here, observation of 1500 μm × 1100 μm is performed on a predetermined surface of the adhesive layer 12. Within the range, the diameters were measured for three openings in order from the opening with the largest diameter, and the average value was used.

Here, when the openings of Samples 1 to 4 were measured and | D ^ave ₁ − D ^ave ₂ | / D ^ave ₂ was obtained, Sample 1: 0.04, Sample 2: 0.06, and Sample. It was 3: 0.12 and sample 4: 0.69.

As a method of obtaining the average value of the diameters of each opening, the above-mentioned method is an example, and it is desirable to appropriately optimize it according to the actual form of the adhesive layer 12. For example, an opening having an extremely large diameter or a peculiar opening such as an opening having a distorted opening shape may be excluded from the calculation of the average value. Also, instead of using three samples in order from the opening with the largest diameter, up to three openings in order from the opening with the largest diameter can be excluded, and the openings of subsequent sizes can be used as a sample for calculating the average value. Good. Further, the number of samples may be increased to more than three to improve the accuracy.

By the way, the adhesive sheet 1 for a visible light transmitting surface of the present invention is not limited to the one attached to the entire surface 20s of the visible light transmitting material, but is attached only to a part of the surface 20s of the visible light transmitting material. It may be attached. When the adhesive sheet 1 for a visible light transmitting surface is attached to only a part of the surface 20s of the visible light transmitting material, as shown in FIGS. 6 (a) and 6 (b), the visible light transmitting surface is transmitted. On the surface 20s of the material, the outer shape So of the outline of the adhesive sheet 1 for the visible light transmitting surface, and the adhesive sheet 1 for the visible light transmitting surface when a part of the in-plane area of the adhesive sheet 1 for the visible light transmitting surface is hollowed out. The hollow shape Si, which is the contour line shape of the absent region, or both of them will be visually recognized. Here, it is preferable that at least one of the outer shape So and the hollowed-out shape Si of the adhesive sheet 1 for the visible light transmitting surface in a plan view has a design property as a shape.

Examples of shapes that have design characteristics include triangles, quadrangles, pentagons, hexagons, other polygons, circles, ellipses, star-shaped shapes such as asteroids, heart-shaped shapes such as cardioids, and drops (raindrops or tears). Abstract shapes such as drops), outlines of animals and plants such as letters, people, animals, flowers, outlines of natural objects such as mountains, rivers, waterfalls, clouds, lightning bolts, and sun-moon steroids, and outlines of these natural objects. The conceptualized polygonal pattern, thunder pattern, etc., and the outline of artificial objects such as airplanes, automobiles, ships, houses, buildings, towers, and bridges can be mentioned. For example, even if it is a simple figure such as a circle, if the functional layer 15 transmits only the wavelength of white light that looks orange, the adhesive sheet 1 for the visible light transmitting surface itself becomes orange. Since it is visually recognized, it can be said that it has a design such as reminiscent of the sun. Of course, a shape other than the above example may be used.

As described above, when at least one of the outer shape So and the hollowed-out shape Si of the adhesive sheet 1 for the visible light transmitting surface in a plan view has a design as a shape, the function of the functional layer 15 is added. In addition, since the designability of the outer shape So or the hollow shape Si is added, the adhesive sheet 1 for the visible light transmitting surface can be used as a partial decorative sheet. Further, if the adhesive sheet 1 for a visible light transmitting surface according to the present invention is regarded as a partial decorative sheet, the function of the functional layer 15 as described later can provide effects not only in terms of design but also in terms of function.

Next, the functional layer 15 will be described. The functional layer 15 determines the function of the adhesive sheet 1 for a visible light transmitting surface by its function. The functional layer 15 is formed by blending additives for exhibiting each function or laminating materials on the sheet that is the base thereof. As the base sheet of the functional layer 15, a sheet usually used as a base material of a decorative sheet can be adopted without limitation as long as the function of the functional layer 15 is not practically impaired, and is typically made of a thermoplastic resin. A resin sheet is used. As the thermoplastic resin, for example, polyolefin resins such as polypropylene and polyethylene, polyester resins, polycarbonate resins, acrylonitrile-butadiene-styrene resins (hereinafter, also referred to as "ABS resins"), acrylic resins, vinyl chloride resins and the like are used. To. Among these, polyolefin resins, polyester resins, polycarbonate resins and ABS resins are preferable, and polyolefin resins are particularly preferable, from the viewpoint of obtaining more excellent processing characteristics, weather resistance and scratch resistance. In the present invention, these resins can be used alone or in combination of two or more.

The polyolefin resin is not particularly limited, and for example, polyethylene (low density, medium density, high density), polypropylene, polymethylpentene, polybutene, ethylene-propylene copolymer, propylene-butene copolymer, ethylene-vinyl acetate. Examples thereof include copolymers, ethylene-acrylic acid copolymers, ethylene-propylene-butene copolymers, and polyolefin-based thermoplastic elastomers. Among them, polyethylene (low density, medium density, high density), polypropylene, ethylene-propylene copolymer, and propylene-butene copolymer are preferable from the viewpoint of obtaining more excellent processing properties, weather resistance, and scratch resistance. Polypropylene resins such as polypropylene, ethylene-propylene copolymer, and propylene-butene copolymer are more preferable.

Examples of the polyester resin include polyethylene terephthalate, polyethylene naphthalate, ethylene glycol-terephthalic acid-isophthalic acid copolymer, terephthalic acid-ethylene glycol-1,4 cyclohexanedimethanol copolymer, polyester-based thermoplastic elastomer and the like.
(Function example 1)
Hereinafter, some functions of the functional layer 15 will be illustrated.

As an example of the first function, the functional layer 15 in the adhesive sheet 1 for a visible light transmitting surface is an ultraviolet absorbing layer, and preferably has an ultraviolet shielding performance of absorbing and shielding ultraviolet rays. Here, the ultraviolet absorption performance required for the ultraviolet absorption layer is such that the ultraviolet transmittance is 50% or less, preferably 20% or less, and more preferably 10% or less. Such ultraviolet transmittance shall be determined in accordance with JIS A5759: 2008. This ultraviolet blocking performance is preferably realized mainly by the function of the functional layer 15 in the structure of the pressure-sensitive adhesive sheet 1 for the visible light transmitting surface, and in that case, the additive or laminated to be blended in the functional layer 15. It is preferable that the material contains an ultraviolet absorber. Examples of UV absorbers include organic UV absorbers such as benzotriazole-based UV absorbers, benzophenone-based UV absorbers, triazine-based UV absorbers, and hydroxyphenyltriazine-based UV absorbers, titanium dioxide, zinc oxide, zirconium oxide, and oxidation. Examples thereof include an inorganic ultraviolet absorber composed of fine particles such as cerium. These UV absorbers can be used alone or in combination with other additives.

The content of the ultraviolet absorber in the functional layer 15 is preferably 0.1 part by mass or more, more preferably 0.2 part by mass or more, and further preferably 0.% by mass with respect to 100 parts by mass of the resin constituting the functional layer 15. It is 3 parts by mass or more, and the upper limit is preferably 5 parts by mass or less, more preferably 3 parts by mass or less, and further preferably 2 parts by mass or less. When the content of the ultraviolet absorber in the base material is within the above range, bleed-out and clouding are less likely to occur, and an excellent addition effect can be obtained.

If the adhesive sheet 1 for a visible light transmitting surface whose functional layer 15 is an ultraviolet absorbing layer is attached to a visible light transmitting material 20 such as a normal window material, the attached window material is used as a UV cut window material. You will be able to do it. Further, as described above, the pressure-sensitive adhesive sheet 1 for a visible light transmitting surface according to the present invention can be peeled off from the surface 20s of the visible light transmitting material without being damaged, and can be reused. Therefore, the adhesive sheet 1 for the visible light transmitting surface is used only in spring and summer when the amount of ultraviolet irradiation is relatively large and the skin is exposed, and in autumn and winter when the amount of ultraviolet irradiation is relatively small and the skin is exposed. It can be easily peeled off and not used. Also, for long-distance buses, long-distance ferries, aircraft, etc. that move in the east-west direction, sunlight will continue to shine from the same side (for example, the left side if going west in the northern hemisphere), and the direction of travel (westbound or eastbound). Because the left and right sides are switched (for example, the right side if going east in the northern hemisphere), by replacing the adhesive sheet 1 for the visible light transmitting surface from the left side window material to the right side window material at the time of turning back, passengers can prevent sunburn and have a natural color. It is possible to achieve both the acquisition of a tasteful car window. Further, if the adhesive sheet 1 for the visible light transmitting surface is damaged or soiled, it can be easily replaced.
(Function example 2)
As an example of the second function, the functional layer 15 in the adhesive sheet 1 for a visible light transmitting surface is an infrared absorbing layer, and preferably has an infrared shielding performance of absorbing and shielding infrared rays. Here, the infrared absorption performance required for the infrared absorption layer is determined in accordance with the solar radiation transmittance specified in JIS R3106: 1998. This solar radiation blocking performance is preferably realized mainly by the function of the functional layer 15 in the configuration of the adhesive sheet 1 for the visible light transmitting surface, and in that case, the additive or laminated to be blended in the functional layer 15. It is preferable that the material contains an infrared absorber. As the infrared absorber, either an inorganic type or an organic type can be used as long as it has a property of effectively absorbing infrared rays, particularly light having a wavelength in the near infrared region, but it is inorganic from the viewpoint of durability. The system is preferable.

The inorganic infrared absorber is at least one selected from, for example, titanium oxide, zinc oxide, tungsten oxide, indium oxide, tin-doped indium oxide (ITO), tin oxide, antimony-doped tin oxide (ATO), and zinc sulfide. Among these, antimony-doped indium oxide (ATO) is preferable because of the balance between cost and infrared absorption performance and the stability of supply. Further, as the inorganic infrared absorber, tungsten oxide is preferable, and composite tungsten oxide is more preferable, from the viewpoints of weather resistance, near-infrared absorption performance, visible light transmittance and the like.

Examples of the organic infrared absorber include cyanine compounds, squarylium compounds, thiol nickel complex salt compounds, naphthalocyanine compounds, phthalocyanine compounds, triallylmethane compounds, naphthoquinone compounds, anthraquinone compounds, and diimonium compounds. Compounds, as well as N, N, N', N'-tetrakis (p-di-n-butylaminophenyl) -p-phenylenedi aminium perchlorate, phenylenedi aminium chlorine salt, phenylenedi aminium hexa. Amino compounds such as fluoroantimonates, boron fluoride of phenylenedi aminium, fluorine salts of phenylenedi aminium, perchlorates of phenylenedi aminium, copper compounds and bisthiourea compounds, phosphorus compounds and copper compounds, phosphoric acid Examples thereof include a phosphoric acid ester copper compound obtained by reacting an ester compound with a copper compound.

Among these, thiol nickel complex salt compounds (Japanese Patent Laid-Open No. 9-230134, etc.) and phthalocyanine compounds are preferable, and in particular, fluorine-containing phthalocyanine compounds disclosed in JP-A-2000-26748, etc. are organic compounds. Among the infrared absorbers, it is suitable when used in combination with an inorganic compound because it has high visible light transmittance and excellent properties such as heat resistance, light resistance, and weather resistance.

If the adhesive sheet 1 for a visible light transmitting surface whose functional layer 15 is an infrared absorbing layer is attached as a visible light transmitting material 20 to, for example, a normal window material, the attached window material can be used as a heat ray absorbing window material. You will be able to do it. Further, as described above, the pressure-sensitive adhesive sheet 1 for a visible light transmitting surface according to the present invention can be peeled off from the surface 20s of the visible light transmitting material without being damaged, and can be reused. Therefore, it is possible to easily use the adhesive sheet 1 for the visible light transmitting surface only in the warm season when the sunlight feels hot, and not to peel it off and use it in the cold season when the sunlight feels warm. .. In addition, in long-distance buses, long-distance ferries, aircraft, etc. that move in the east-west direction, sunlight will continue to shine from the same side, and the left and right will switch depending on the direction of travel, so the adhesive sheet 1 for visible light transmitting surface will be used when turning back. For example, by replacing the window material on the left side with the window material on the right side, it is possible to obtain a car window having a natural color while suppressing the passengers from feeling uncomfortable with the sunlight. Further, if the adhesive sheet 1 for the visible light transmitting surface is damaged or soiled, it can be easily replaced.
(Function example 3)
As an example of the third function, the functional layer 15 is preferably colored in a chromatic color. In order to color the functional layer 15, a chromatic coloring pigment is added into the functional layer 15. Examples of such chromatic color pigments include organic color pigments such as azo pigments, phthalocyanine pigments, and condensed polycyclic pigments. More specifically, azo pigments include soluble pigments such as Watching Red and Carmine 6C, insoluble azo pigments such as monoazo yellow, disazo yellow, pyrazolone orange, red and permanent red, and phthalocyanine pigments include copper phthalocyanine pigments. Examples of metal-free phthalocyanine pigments include blue and green pigments, and examples of condensed polycyclic pigments include dioxazine violet and quinacridone violet, but the pigments are not limited thereto.

There are also inorganic coloring pigments, for example, iron oxide has various hues of yellow, red, and black, and fine iron oxide having low hiding power is particularly useful. Titanium oxide is also originally a white achromatic pigment, but there is a yellow pigment as titanium-yellow. This is a promising alternative to the conventional highly toxic yellow pigments such as cadmium yellow and chrome yellow. Further, ultramarine, prussian blue, cobalt blue and the like can be used as blue pigments.

In the present invention, since black and white have independent hues in terms of color optics, achromatic pigments such as titanium oxide and carbon black can be used in the same manner as chromatic coloring pigments. Further, the above colored pigments may be mixed and used.

As the chromatic color pigment, a commercially available one may be used as it is, but the commercially available product has various particle sizes. Since light transmission is an important factor in the present invention, if the particle size is too large, light transmission is poor, and if it is too fine, it becomes difficult to disperse in the base sheet, so the primary particle size is 0. 1 to 10 μm, preferably 1 to 5 μm.

The adhesive sheet 1 for a visible light transmitting surface having a functional layer 15 colored in a chromatic color is, so to speak, a light transmitting color sheet. If the adhesive sheet 1 for a visible light transmitting surface that functions as such a light transmitting color sheet is attached to, for example, a normal window material as a visible light transmitting material 20, it can be used as a colored window material. Further, especially when the transmittance of visible light is low, it can be used as a sun visor by being attached to a window material of a building, a window material of a driver's seat of a transportation device, or the like.

Further, as described above, the pressure-sensitive adhesive sheet 1 for a visible light transmitting surface according to the present invention can be peeled off from the surface 20s of the visible light transmitting material without being damaged, and can be reused. Therefore, for example, when it is used as a colored window material, its color can be easily changed, and when it is used as a sun visor, its sticking position can be easily changed. Further, in any case, the state of the normal window material before pasting can be easily restored. Further, if the adhesive sheet 1 for the visible light transmitting surface is damaged or soiled, it can be easily replaced.

Further, in the example of the third function, the functional layer 15 has a plurality of regions having different hues, and the boundary of the plurality of regions has a region having a lightness or a transmittance lower than that of the plurality of regions. Is preferable. In this case, it is preferable that the region having low lightness or transmittance looks blackish and the contour shapes of the plurality of regions having different hues are various. In such a case, the adhesive sheet 1 for the visible light transmitting surface can be used as a stained glass sheet that simulates the stained glass. Also in this example, due to the feature of the adhesive sheet 1 for visible light transmitting surface that rework is easy, it seems that the pattern of the stained glass sheet was changed, the state of the normal window material was restored, and it was scratched or soiled. It is easy to replace it in such cases.
(Function example 4)
As an example of the fourth function, it is preferable that at least one of the functional layer 15 and the adhesive layer 12 is a light diffusion permeable layer. That is, in the adhesive sheet 1 for a visible light transmitting surface, it is preferable that the functional layer 15 is a light diffusion transmitting layer or the adhesive layer 12 is a light diffusion transmitting layer, whichever is satisfied. Such a light diffusing and transmitting layer can be obtained by containing, for example, 1 to 50% by weight of a spherical achromatic color pigment in at least one of the functional layer 15 and the adhesive layer 12.

Spherical achromatic pigments include resin spheres such as silicone resin spheres, acrylic resin spheres, and epoxy resin spheres, resin dispersions such as polycarbonate and wax, and inorganic spheres such as silica beads and glass beads. From the viewpoint of visible light transmittance, a pigment having a refractive index of 2 or less is preferable, and when the refractive index is high, the properties of the white pigment are exhibited by haze. In the present invention, the spherical body may be a hollow body. Further, in the present invention, fine short fibers (whiskers) having a refractive index of 2 or less and a plate-like body can be used in combination, and examples of such materials include wollastonite and glass flakes. Further, the above colored pigments may be mixed and used.

The adhesive sheet 1 for a visible light transmitting surface, in which at least one of the functional layer 15 and the adhesive layer 12 is a light diffusion transmitting layer, is a sheet having a haze effect, in other words, a frosted glass (frosted glass) effect. is there. If the adhesive sheet 1 for a visible light transmitting surface having such a frosted glass effect (haze effect) is attached to, for example, a normal window material as a visible light transmitting material 20, the window material has a frosted glass effect. It can be used as a material, and can be a window material that has both daylighting property and concealing property through the window material. Further, as described above, the pressure-sensitive adhesive sheet 1 for a visible light transmitting surface according to the present invention can be peeled off from the surface 20s of the visible light transmitting material without being damaged, and can be reused. Therefore, for example, when it is used as a window material having a frosted glass effect, it can be easily returned to the normal state of the window material before pasting. Further, if the adhesive sheet 1 for the visible light transmitting surface is damaged or soiled, it can be easily replaced.

Such a light diffusing transmissive layer preferably has a haze of 40% or more, a haze of 70% or more, and a haze of 80% or more as defined by JIS K7136: 2000 as the diffusion performance of transmitted light. Is more preferable.
(Function example 5)
As an example of the fifth function, it is preferable that the functional layer 15 has a function of reflecting a part of the incident light and transmitting the other part. The function is a beam splitter function, and a layer having such a function is sometimes called a half mirror or a magic mirror. The light transmittance of the functional layer 15 having such a function is preferably in the range of 10 to 90%. The functional layer 15 having such a function is formed by forming a visible light reflecting film very thinly on a sheet serving as a base material of the functional layer 15 to make it translucent, and usually forming a protective film. .. The visible light reflective film is a known method such as a vacuum deposition method, a sputtering method, and a CVD method, in which a simple substance of a metal material such as aluminum, tin, chromium, nickel, gold, silver, and copper, or a compound of these metals is used. Can be laminated and formed with. The ratio of reflected light to transmitted light can be adjusted by adjusting the film thickness of the reflective film. In addition to the above, such a function of the functional layer 15 may be imparted by other known methods.

If the adhesive sheet 1 for a visible light transmitting surface having a function of reflecting a part of the light incident on the functional layer 15 and transmitting the other part is attached as a visible light transmitting material 20, for example, to a normal window material. , The window material can be used as a window material having a half mirror function. A window material having a half mirror function looks like a mirror from a bright side and looks like a translucent window material from a dark side. In the daytime, when viewed from the bright outdoor side, the reflected light is mainly reflected like a mirror, so the transmitted light from the room is hardly recognized, that is, the room is hardly seen through, and the lace curtain. There is no need to hide the room with such means. From the dark indoor side, you can enjoy the outdoor scenery as a translucent window material without being blocked by lace curtains. On the other hand, at night, as opposed to daytime, the interior can be seen better from the outside, so it is sufficient to cover it with a curtain or the like as in the case of ordinary window materials. By attaching the adhesive sheet 1 for the visible light transmitting surface according to this functional example to a normal window material in this way, it is possible to obtain a window material that has both concealment from the outside and visibility from indoors to outdoors. .. It is also useful in the warm season because it also has a heat insulating effect by blocking infrared rays.

Further, as described above, the pressure-sensitive adhesive sheet 1 for a visible light transmitting surface according to the present invention can be peeled off from the surface 20s of the visible light transmitting material without being damaged, and can be reused. Therefore, for example, when changing clothes in a parking lot at a mountain climbing entrance or a parking lot at a beach, it can be attached to a window material of the car to conceal the inside of the car. Further, if attention is paid to the heat insulating effect by blocking infrared rays, it can be used only in the warm season and peeled off in the cold season. When the half mirror effect is not required, the normal window material before pasting can be easily restored. Further, if the adhesive sheet 1 for the visible light transmitting surface is damaged or soiled, it can be easily replaced.
(Function example 6)
As an example of the sixth function, it is preferable that the functional layer 15 has a function of narrowing the viewing angle and lowering the visibility from an angled direction from the front. This function is a so-called peep prevention function that narrows the viewing angle and prevents peeping from an angled direction from the front. For example, it is a minute as disclosed in Japanese Patent Application Laid-Open No. 2-97904. By forming the louver, it can be realized by transmitting only the light in the direction close to the vertical direction with respect to the surface on which the functional layer 15 extends. The method for realizing the peep prevention function is not limited to the above, but is another known method such as a parallel array of triangular prism microprisms as disclosed in US Pat. No. 2,248,638. May be good.

When the adhesive sheet 1 for a visible light transmitting surface having the functional layer 15 having a peep prevention function is attached to, for example, a normal window material as a visible light transmitting material 20, the window material narrows the viewing angle from the outside to the inside. It can be used as a window material. A window material with a narrow viewing angle can reduce the chance of seeing the inside from the outside compared to a normal window material.

Further, if the protective material existing on the outermost surface of the monitor of the personal computer or the outermost surface of the screen of the smartphone is considered as the visible light transmitting material 20, the adhesive sheet 1 for the visible light transmitting surface having a peep prevention function is attached to them. As a result, it can be used as a monitor of a personal computer or a screen of a smartphone having a peep prevention function. With a computer monitor or smartphone screen that has such a peep prevention function, the computer or smartphone can be used without worrying about peeping by neighbors, for example, in a car of public transportation. ..

Further, as described above, the pressure-sensitive adhesive sheet 1 for a visible light transmitting surface according to the present invention can be peeled off from the surface 20s of the visible light transmitting material without being damaged, and can be reused. Therefore, when applying to the monitor of a personal computer or the screen of a smartphone as described above, the adhesive sheet 1 for the visible light transmitting surface is attached only when there are many other people in the vicinity such as in a car of public transportation. In other cases, it is easy to peel it off. Further, if it is a shared notebook computer in the company, it is easy to attach the adhesive sheet 1 for the visible light transmitting surface only when taking it out of the company and peel it off in the company for use. Further, if the adhesive sheet 1 for the visible light transmitting surface is damaged or soiled, it can be easily replaced.
(Function example 7)
As an example of the seventh function, it is preferable that the functional layer includes a layer in which a non-woven fabric is impregnated with ink, and the non-woven fabric has fibers or fiber lumps dispersed in a texture. As the material of the non-woven fabric, a glass non-woven fabric including a non-woven fabric of synthetic fibers such as rayon, vinylon, polyester and polyolefin can be used, and Japanese paper is also included in the non-woven fabric in this functional example. As the non-woven fabric in which fibers or fiber lumps are dispersed in the texture, a non-woven fabric having a cloud dragon pattern can be preferably used. The dispersion of fibers or fiber lumps can be recognized with the naked eye when the non-woven fabric is impregnated with ink because the degree of coloring thereof differs from the texture.

The functional layer 15 includes a layer in which a non-woven fabric is impregnated with ink, and the non-woven fabric has fibers or fiber lumps dispersed in the texture. The adhesive sheet 1 for a visible light transmitting surface has colored fibers or fiber lumps. The appearance is reminiscent of Japanese paper because the degree of fiber is different from the texture. When such an adhesive sheet 1 for a visible light transmitting surface is attached as a visible light transmitting material 20 to, for example, a normal window material, the degree of coloring of the fibers or fiber lumps differs from that of the texture, which becomes more remarkable due to the transmitted light. More reminiscent of Japanese paper. A non-woven fabric in which fibers or fiber lumps are dispersed in such a texture is typically a non-woven fabric having a cloud dragon pattern, and the cloud dragon pattern can create a Japanese atmosphere. Further, the light transmitted through the adhesive sheet 1 for the visible light transmitting surface having the present functional example can be made to have a soft feeling like the light transmitted through the shoji paper. Due to each of the above effects, the adhesive sheet 1 for a visible light transmitting surface having this functional example can be suitably applied to, for example, a window material of a Japanese-style room, a window material of a space where a Japanese atmosphere is desired to be produced, and the like.

Also in this functional example, it is possible to easily return to the state of the normal window material before pasting, and if the adhesive sheet 1 for the visible light transmitting surface is damaged or dirty, it can be easily replaced. Is possible.
(Function example 8)
As an example of the eighth function, the functional layer includes a light-shielding layer, and the light-shielding layer preferably has a large number of through holes, and the visible light transmittance of the light-shielding layer is 10% or less. More preferred. Here, the visible light transmittance of the light-shielding layer is for a portion where the through hole does not exist, and is determined in accordance with JIS A5759: 2008 as having no through hole. That is, the visible light transmittance does not include the effect of visible light transmission by the through hole. The shape and distribution of the through holes (hole diameter, aperture ratio, etc.) are not particularly specified, but any of them may have the following effects. As the light-shielding layer having a visible light transmittance of 10% or less, a material having a visible light transmittance of 10% or less may be used, or visible light is absorbed on the surface of the material having a visible light transmittance of more than 10%. The visible light transmittance may be set to 10% or less by printing an ink having a high rate.

In this functional example, it is particularly preferable that the adhesive layer 12 is almost transparent. If the adhesive sheet 1 for the visible light transmitting surface in this functional example is attached as the visible light transmitting material 20 to, for example, a normal window material of a building, the light-shielding layer included in the functional layer has a large number of through holes. The effect of can be obtained. In the daytime, the outdoor side is relatively brighter than the indoor side, so on the indoor side, the transmitted light from the outdoor side is superior to the reflected light by the adhesive sheet 1 for the visible light transmitting surface. , You can see through the outdoors. On the other hand, on the outdoor side, the reflected light by the sheet is more predominant than the transmitted light from the indoor side transmitted through the visible light transmitting surface adhesive sheet 1 from the outdoor side, and the through holes of the large number of through holes. Since the diameter is fine, it is almost impossible to see through the room, and the sheet is visually recognized. That is, the adhesive sheet 1 for a visible light transmitting surface in this functional example shows an effect similar to that of the adhesive sheet 1 for a visible light transmitting surface in which the functional layer shown in functional example 5 has a half mirror function. The shape and distribution of the through holes are not particularly specified as described above, but the above effects shall be obtained depending on the shape, distribution and the like. By attaching the adhesive sheet 1 for a visible light transmitting surface to a normal window material, it is possible to obtain a window material that has both concealment from the outside and visibility from indoors to outdoors.

In this functional example, in the functional layer, it is preferable that the brightness of the surface side facing the adhesive layer is higher than the brightness of the surface side opposite to the surface side facing the adhesive layer. Since it is usually assumed that the adhesive sheet 1 for a visible light transmitting surface is attached to the window material from the indoor side, in that case, the surface side facing the adhesive layer faces the outdoor side and the surface does not face the adhesive layer. The side faces the indoor side. That is, in the functional layer, it is preferable that the brightness on the outdoor side is higher than the brightness on the indoor side. As described above, in the adhesive sheet 1 for the visible light transmitting surface in this functional example, the transmitted light is predominant over the reflected light on the indoor side, and the reflected light is predominant over the transmitted light on the outdoor side. However, when the brightness on the outdoor side is higher than the brightness on the indoor side in the functional layer, the effect can be more easily exerted.

In order to make the brightness of the surface side facing the adhesive layer higher than the brightness of the surface side not facing the adhesive layer in the functional layer, the light-shielding layer included in the functional layer faces the adhesive layer. A high-brightness (whitish) color ink may be formed on the surface side, and a low-brightness (blackish) color ink may be formed on the surface side that does not face the adhesive layer, for example, for printing. The pattern formed by ink or the like is not limited to a single color solid, and if a pattern having a design is formed on the outdoor side (the side facing the adhesive layer) where the reflected light is predominant, the pattern penetrates a large number of fine particles. Despite the presence of holes, it can be seen fairly clearly from the outdoor side. When used for window materials such as shops and rear windows such as taxis and buses, it is one of the preferable examples to form a pattern such as an advertisement or a landscape.

Also in this functional example, it is possible to easily return to the state of the normal window material before pasting, and if the adhesive sheet 1 for the visible light transmitting surface is damaged or dirty, it can be easily replaced. Is possible.
(Functions and others)
The adhesive sheet for a visible light transmitting surface according to the present invention can be used as a visible light transmitting material if it is attached to the surface 20s of the visible light transmitting material even if the functional layer 15 does not have a characteristic function. Since it physically covers the surface 20s, it functions as a protective sheet that protects the surface 20s of the visible light transmitting material. When the adhesive sheet for visible light transmitting surface according to the present invention is attached to a window material such as a kindergarten or a school, it can be easily replaced if the sheet is damaged or dirty. Combined with the above-mentioned characteristics, it can be suitably used as a protective sheet for window materials.

Further, the adhesive sheet for a visible light transmitting surface according to the present invention can also function as a shatterproof sheet when the window material is damaged, as compared with the case where the sheet is not attached to the window material.
(Second Embodiment)
FIG. 7A shows an outline of a cross section of the adhesive sheet 101 for a visible light transmitting surface according to a second embodiment of the present invention, and FIG. 7 shows an outline of a cross section of an adhesive sheet 102 for a visible light transmitting surface with a peelable base sheet. Shown in (b). As shown in FIG. 7A, the adhesive sheet 101 for the visible light transmitting surface is laminated in the order of the adhesive layer 12, the base material 13, and the functional layer 15 from the lower side. As shown in FIG. 7B, the adhesive sheet 102 for a visible light transmitting surface with a peelable base sheet is laminated in the order of the peelable base sheet 11, the adhesive layer 12, the base material 13, and the functional layer 15 from the lower side. ing. The sheets 101 and 102 according to the second embodiment have a base material 13 between the adhesive layer 12 and the functional layer 15 with respect to the sheets 1 and 2 according to the first embodiment shown in FIG. The point is different. In each of the sheets 101 and 102, another layer may be provided between the layers (sheets), and for example, a primer layer may be provided between the base material 13 and the adhesive layer 12. An adhesive layer may be provided between the functional layer 15 and the base material 13. The peelable base material sheet 11 is peeled off when the pressure-sensitive adhesive sheet 102 for a visible light transmitting surface with a peelable base material sheet is attached to the surface 20s of the visible light transmitting material. Therefore, the peelable base sheet 11 is present in the adhesive sheet 102 for the visible light transmitting surface with the peelable base sheet, which is in a state before being attached to the surface 20s of the visible light transmitting material, but is made of the visible light transmitting material. It does not already exist in the adhesive sheet 101 for the visible light transmitting surface attached to the surface 20s.

The base material 13 is useful when the adhesive layer 12 and the functional layer 15 alone do not have sufficient mechanical strength as an adhesive sheet for a visible light transmitting surface, and the insufficient mechanical strength is used as a base material. It can be supplemented by 13. The pressure-sensitive adhesive sheet for a visible light transmitting surface according to the present invention can be peeled off from the surface 20s of the visible light transmitting material without being damaged and can be reused, so that it can withstand repeated use, especially repeated peeling. Strength, durability, cut resistance, etc. are required, and the base material 13 makes it possible to reinforce those performances.

The material of the base material 13 is preferably transparent or translucent. This is to effectively exert each function of the above-mentioned functional layer 15. However, when the adhesive sheet for the visible light transmitting surface is used as a light-shielding sheet or a sun visor as described above, the material of the base material 13 is opaque because the function as the adhesive sheet for the visible light transmitting surface is the light-shielding property. It doesn't matter what it is. Examples of the material of the base material 13 include the materials exemplified as the material of the sheet that is the base of the functional layer 15, and a resin sheet made of a thermoplastic resin is typically used. As the thermoplastic resin, for example, polyolefin resin, polyester resin, polycarbonate resin, acrylonitrile-butadiene-styrene resin (hereinafter, also referred to as “ABS resin”), acrylic resin, vinyl chloride resin and the like are used. Among these, polyolefin resins, polyester resins, polycarbonate resins and ABS resins are preferable, and polyolefin resins are particularly preferable, from the viewpoint of obtaining more excellent processing characteristics, weather resistance and scratch resistance. In the present invention, these resins can be used alone or in combination of two or more. In addition to the above, various transparent or translucent sheets, thin paper, glass fiber, cloth, etc. can also be applied. When the function of the adhesive sheet for the visible light transmitting surface is light-shielding, in addition to the above, opaque materials such as paper, wood, cement board, mortar board, and metal sheet may be used.

The adhesive layer is a layer formed between the functional layer 15 and the base material 13 for adhering both. The adhesive layer contains an adhesive and has a composition of vinyl chloride-based resin, vinyl chloride-vinyl acetate copolymer, ethylene-vinyl acetate copolymer resin, polyolefin-based copolymer resin, acrylic resin, urethane-based resin, and polyester-based resin. Examples thereof include resins and polyethylene-based resins, and among them, vinyl chloride-based resins are preferable. The adhesive layer is preferably transparent or translucent, but is similar to the base material 13 in that it may be opaque depending on the function of the adhesive sheet for visible light transmitting surfaces.

Further, the adhesive layer is not an essential structure in the present invention. For example, when the base material 13 is formed by coating one surface of the functional layer 15 with a liquid composition of vinyl chloride resin and solidifying the liquid composition, it is directly on the functional layer 15 without the intervention of an adhesive layer. The base material 13 is formed on the surface. In the case of this form, it can be considered that the solidified layer of the liquid composition has both the adhesive layer and the base material 13.

Further, one surface of the functional layer 15 is coated with an adhesive layer made of a vinyl chloride resin composition, and the base material 13 made of a separately deposited vinyl chloride resin composition and the adhesive layer are thermocompression bonded. In the case of laminating, it is possible that in each of the sheets 101 and 102, even though both layers of the base material 13 and the adhesive layer are present, the two layers cannot be identified as different layers.
(Third Embodiment)
FIG. 8A shows an outline of a cross section of the adhesive sheet 201 for a visible light transmitting surface according to a third embodiment of the present invention, and FIG. 8 shows an outline of a cross section of an adhesive sheet 202 for a visible light transmitting surface with a peelable base sheet. Shown in (b). As shown in FIG. 8A, the adhesive sheet 201 for the visible light transmitting surface is laminated in the order of the adhesive layer 12, the functional layer 15, and the protective layer 16 from the lower side. As shown in FIG. 8B, the adhesive sheet 202 for a visible light transmitting surface with a peelable base sheet is laminated in the order of the peelable base sheet 11, the adhesive layer 12, the functional layer 15, and the protective layer 16. ing. The sheets 201 and 202 according to the third embodiment are on the surface side opposite to the surface side on which the adhesive layer 12 of the functional layer 15 is laminated with respect to the sheets 1 and 2 according to the first embodiment shown in FIG. The difference is that the protective layer 16 is provided on the surface. In each of the sheets 201 and 202, another layer may be provided between the layers (sheets), and for example, a primer layer may be provided between the functional layer 15 and the adhesive layer 12. Good. The peelable base material sheet 11 is peeled off when the pressure-sensitive adhesive sheet 202 for a visible light transmitting surface with a peelable base material sheet is attached to the surface 20s of the visible light transmitting material. Therefore, the peelable base sheet 11 is present in the adhesive sheet 202 for the visible light transmitting surface with the peelable base sheet, which is in a state before being attached to the surface 20s of the visible light transmitting material, but is made of the visible light transmitting material. It is no longer present in the adhesive sheet 201 for visible light transmitting surfaces attached to the surface 20s.

As described above, the protective layer 16 is laminated on the surface side opposite to the surface side on which the adhesive layer 12 of the functional layer 15 is laminated, and plays a role of protecting the functional layer 15. The main components of the protective layer 16 are a fluororesin such as polyvinyl fluoride, vinylidene polyvinylfluoride, ethylene-4ethylene fluoride copolymer, polytetrafluoride ethitene, a silicone resin, a vinyl chloride-vinyl acetate copolymer, and the above. Polyester resin, methyl poly (meth) acrylate, butyl poly (meth) acrylate, methyl (meth) acrylate-butyl acrylate copolymer, styrene-methyl acrylate copolymer described in , Acrylic resins such as methyl styrene- (meth) acrylate- (meth) acrylate dihydroxyethyl copolymer, thermocurable urethane resins, thermocurable polyester resins, melanin resins, epoxy resins and the like , Acrylic acid ester type, epoxy type, unsaturated polyester type and other ionizing radiation curable resins and the like. As the ionizing radiation, an electron beam, ultraviolet rays, or the like can be used. The protective layer 16 can be formed by forming a resin composed of the main components by various printing methods such as a gravure printing method, an offset printing method, and an inkjet printing method, or a coating method such as a curtain flow coat or a roll coat. Alternatively, the resin film composed of the main components can be formed by laminating on the surface side opposite to the surface side on which the adhesive layer 12 of the functional layer 15 is laminated. It is preferably formed by gravure printing a urethane resin-based ink.

In addition, the thickness may be appropriately determined according to the application and function, and also considering the process load, workability, and storability. As an example, the thickness is about 1 μm to 100 μm.
(Fourth Embodiment)
FIG. 9A shows an outline of a cross section of the adhesive sheet 301 for a visible light transmitting surface according to a fourth embodiment of the present invention, and FIG. 9 shows an outline of a cross section of an adhesive sheet 302 for a visible light transmitting surface with a peelable base sheet. Shown in (b). As shown in FIG. 9A, the adhesive sheet 301 for the visible light transmitting surface is laminated in the order of the adhesive layer 12, the base material 13, the functional layer 15, and the protective layer 16 from the lower side. As shown in FIG. 9B, the adhesive sheet 302 for a visible light transmitting surface with a peelable base sheet has a peelable base sheet 11, an adhesive layer 12, a base material 13, a functional layer 15, and a protective layer 16 from the lower side. Are stacked in this order. The sheets 301 and 302 according to the fourth embodiment are opposite to the surface side on which the adhesive layer 12 of the functional layer 15 is laminated with respect to the sheets 101 and 102 according to the second embodiment shown in FIG. The difference is that the protective layer 16 is provided on the surface side, and for each of the sheets 201 and 202 according to the third embodiment shown in FIG. 8, between the adhesive layer 12 and the functional layer 15. The difference is that it has a base material 13. In each of the sheets 301 and 302, another layer may be provided between the layers (sheets), and for example, a primer layer may be provided between the base material 13 and the adhesive layer 12. An adhesive layer may be provided between the functional layer 15 and the base material 13. The peelable base material sheet 11 is peeled off when the pressure-sensitive adhesive sheet 302 for a visible light transmitting surface with a peelable base material sheet is attached to the surface 20s of the visible light transmitting material. Therefore, the peelable base sheet 11 is present in the adhesive sheet 302 for the visible light transmitting surface with the peelable base sheet, which is in a state before being attached to the surface 20s of the visible light transmitting material, but is made of the visible light transmitting material. It no longer exists in the adhesive sheet 301 for visible light transmitting surfaces attached to the surface 20s.

In each of the sheets 301 and 302 according to the fourth embodiment of the present invention, both the effect of having the base material 13 in the second embodiment and the effect of having the protective layer 16 in the third embodiment can be obtained. Can be done.
[Laminate]
Next, the laminated body 3 according to the present invention will be described. The laminated body 3 is a laminate of any of the above-mentioned adhesive sheets 1, 101, 201, and 301 for visible light transmitting surfaces and the visible light transmitting material 20. As shown in FIG. 10, the adhesive sheet 1 for the visible light transmitting surface and the visible light transmitting material 20 are laminated to form the laminated body 3 (FIG. 10A), the adhesive sheet 101 for the visible light transmitting surface and the visible light. The laminated body 103 (FIG. 10 (b)) in which the transparent material 20 is laminated, and the laminated body 203 (FIG. 10 (c)) in which the adhesive sheet 201 for the visible light transmitting surface and the visible light transmitting material 20 are laminated. )), The laminated body 303 (FIG. 10 (d)) is a laminate of the adhesive sheet 301 for the visible light transmitting surface and the visible light transmitting material 20.

An example of the visible light transmitting material 20 is as described above. Then, in each of the laminated bodies 3, 103, 203, 303 according to the present invention, in which any one of the adhesive sheets 1, 101, 201, 301 for the visible light transmitting surface according to the present invention and the visible light transmitting material 20 are laminated. It is possible to obtain the effects described in each functional example in the description of the functional layer 15 of the adhesive sheets 1, 101, 201, and 301 for the visible light transmitting surface.

The adhesive sheet for a visible light transmitting surface, the adhesive sheet for a visible light transmitting surface with a peelable base material sheet, and the laminate according to the present invention have been described above with reference to examples of embodiments. However, the present invention is not limited to the above embodiment or its description. The above embodiment is an example, and in any case, the present invention has substantially the same configuration as the technical idea described in the claims of the present invention and exhibits the same effect and effect. It is included in the technical scope of the invention.

The adhesive sheet for a visible light transmitting surface according to the present invention is attached to a visible light transmitting material such as a window material, and can exhibit a specific function mainly by a functional layer. Further, the adhesive sheet for the visible light transmitting surface, which can be easily peeled off without adhesive residue, can be reattached to the visible light transmitting material and used repeatedly. Such an adhesive sheet for a visible light transmitting surface is a light-shielding sheet, a UV cut sheet, a heat ray absorbing sheet, a light transmitting color sheet, a sheet having a frosted glass effect, a half mirror sheet, and a peep prevention sheet, depending on its function. By being attached to a window material such as a building or a transportation device as a sheet, any of the above functions can be imparted to the window material. Since it is easy to peel off or re-adhere the adhesive sheet for the visible light transmitting surface according to the necessity of each of the above functions, it can be suitably used for window materials of buildings and transportation equipment.

The pressure-sensitive adhesive sheet for a visible light transmitting surface with a peelable base material sheet according to the present invention is also used as a state of the pressure-sensitive adhesive sheet for a visible light transmitting surface by peeling off the peelable base material sheet at the time of use. It can be suitably used for windows of buildings and transportation equipment.

Further, since the laminated body according to the present invention is obtained by laminating a visible light transmitting surface adhesive sheet and a visible light transmitting material, each of the visible light transmitting material and the visible light transmitting surface adhesive sheet according to the present invention. Functions can be added. Therefore, it can be suitably used as a window material for buildings and transportation equipment.

1, 101, 201, 301 Adhesive sheet for visible light transmitting surface 2, 102, 202, 302 Adhesive sheet for visible light transmitting surface with peelable base sheet 3, 103, 203, 303 Laminated body 11 Detachable base sheet 12 Adhesive layer 12a, 12a1, 12a2 Concave shape 13 Base material 15 Functional layer 16 Protective layer 20 Visible light transmitting material 20s Surface of visible light transmitting material

Claims (16)

An adhesive sheet for visible light transmitting surfaces that is attached to the surface of visible light transmitting materials.
It has a functional layer and an adhesive layer,
The adhesive layer is an adhesive sheet for a visible light transmitting surface having a plurality of concave shapes on both sides thereof. The pressure-sensitive adhesive sheet for a visible light transmitting surface according to claim 1, which has a visible light transmittance of 5% or more. The adhesive for a visible light transmitting surface according to claim 1 or 2, wherein at least one of the external shape and the hollow shape of the adhesive sheet for a visible light transmitting surface in a plan view has a design as a shape. Sheet. The pressure-sensitive adhesive sheet for a visible light transmitting surface according to any one of claims 1 to 3, wherein the functional layer is an ultraviolet absorbing layer. The pressure-sensitive adhesive sheet for a visible light transmitting surface according to any one of claims 1 to 4, wherein the functional layer is an infrared absorbing layer. The adhesive sheet for a visible light transmitting surface according to any one of claims 1 to 5, wherein the functional layer is colored in a chromatic color. The pressure-sensitive adhesive sheet for a visible light transmitting surface according to claim 6, wherein the functional layer has a plurality of regions having different hues, and a region having a brightness or a transmittance lower than that of the plurality of regions is provided at a boundary between the plurality of regions. .. The pressure-sensitive adhesive sheet for a visible light transmitting surface according to any one of claims 1 to 5, wherein the functional layer has a function of reflecting a part of the incident light and transmitting the other part. The pressure-sensitive adhesive sheet for a visible light transmitting surface according to any one of claims 1 to 5, wherein at least one of the functional layer and the pressure-sensitive adhesive layer is a light diffusion-transmitting layer. The pressure-sensitive adhesive sheet for a visible light transmitting surface according to any one of claims 1 to 5, wherein the functional layer has a function of narrowing the viewing angle to reduce visibility from an angled direction from the front. The visible light transmission according to any one of claims 1 to 3, wherein the functional layer includes a layer in which a non-woven fabric is impregnated with ink, and the non-woven fabric has fibers or fiber lumps dispersed in a texture. Adhesive sheet for surface. The pressure-sensitive adhesive sheet for a visible light transmitting surface according to any one of claims 1 to 3, wherein the functional layer includes a light-shielding layer, and the light-shielding layer has a large number of through holes. The visible light transmitting surface according to claim 12, wherein the functional layer has a brightness on the surface side facing the adhesive layer higher than the brightness on the surface side opposite to the surface side facing the adhesive layer. Adhesive sheet. The average value of the diameters of the concave openings opened on one surface of the adhesive layer is defined as ^Dave _1, and the average diameter of the concave openings opened on the other surface of the adhesive layer is defined as ^Dave _1. When is set to D ^ave ₂ ,
｜ D ^ave ₁ − D ^ave ₂ ｜ / D ^ave ₂ ≤ 0.5
The pressure-sensitive adhesive sheet for a visible light transmitting surface according to any one of claims 1 to 13. Adhesive for visible light transmitting surface with a peelable base sheet further having a peelable base sheet on the surface of the adhesive sheet for visible light transmitting surface according to any one of claims 1 to 14. Sheet. A laminated body in which the pressure-sensitive adhesive sheet for a visible light transmitting surface according to any one of claims 1 to 14 and the visible light transmitting material are laminated.

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