Light control film with pressure-sensitive adhesive layer and method for bonding light control film with pressure-sensitive adhesive layer to glass surface

Abstract

To provide a light control film capable of sliding the light control film temporarily fixed to the surface of glass without requiring application water, easy in positioning and capable of being sufficiently strongly bonded to the surface of glass.SOLUTION: A light control film with a pressure-sensitive adhesive layer, comprising: a light control film that changes between a transparent state and an opaque state depending on the presence or absence of voltage application; a pressure-sensitive adhesive layer laminated on one surface of the light control film; and a release film releasably bonded to a surface of the pressure-sensitive adhesive layer, the light control film with a pressure sensitive adhesive layer is adhered to a glass surface of a window glass of a building or a window glass of a moving body by the pressure sensitive adhesive layer from which the plastic film as the release film is peeled off, and a coefficient of static friction between the plastic film as the release film and the glass surface is 0.8 or less.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a light control film that is attached to a glass surface and a method for attaching the film. [Background technology]

[0002] A light control film is a film that can adjust and control the transmission and blocking of light rays. Such light control films are well known and generally have a structure in which a liquid crystal layer 11 is sandwiched between two electrode films 12 and 13, as shown in FIG. 1. As shown in the figure, the electrode film 12 is formed by laminating a transparent electrode 12b on one side of a flexible transparent film 12a, with the transparent electrode 12b facing the liquid crystal layer 11. Similarly to the electrode film 12, the other electrode film 13 is formed by laminating a transparent electrode 13b on one side of a flexible transparent film 13a, with the transparent electrode 13b facing the liquid crystal layer 11. Applying a voltage to these electrodes 12b and 13b changes the optical properties of the liquid crystal layer 11. For example, applying a voltage makes the liquid crystal layer opaque and blocks light rays, whereas stopping the voltage application makes the liquid crystal layer transparent and allows light rays to pass through. Also known are light-control films that, depending on the type of liquid crystal, make the liquid crystal layer transparent by applying a voltage, allowing light to pass through, and make the liquid crystal layer opaque by removing the voltage, blocking light.

[0003] Such light control films are used for a variety of purposes, but a typical use is to attach them to the surface of window glass in buildings or automobiles to adjust or control the amount of sunlight that enters through these windows.

[0004] When bonding a light control film to a glass surface in this way, conventionally, an acrylic adhesive has been used (see Patent Document 1). That is, first, an acrylic adhesive is laminated onto the light control film, and then the resulting light control film with the adhesive layer is bonded to the glass surface.

[0005] However, acrylic adhesives have strong adhesive properties, which means that air bubbles are easily trapped between the light control film and the glass surface during application. This trapping of air bubbles not only creates unevenness on the surface of the light control film, impairing its appearance and even impairing the functionality of the light control film itself. Furthermore, once a portion of the light control film is adhered to the glass surface, it is impossible to adjust its position. While it may be possible to remove the adhered light control film and re-apply it to prevent air trapping or to readjust its position, as mentioned above, the strong adhesive properties of acrylic adhesives make this removal difficult. Thus, when applying a light control film to a glass surface using an acrylic adhesive, air bubbles are easily trapped, and it is difficult to remove and reapply. Therefore, it is necessary to accurately align the film from the beginning and carefully apply it to avoid trapping air bubbles.

[0006] For this reason, the following procedure has been used for bonding.

[0007] That is, first, water containing a surfactant (hereinafter referred to as "application water") is sprayed evenly onto the glass surface to form a thin film of application water on the surface.

[0008] Next, the release film protecting the acrylic adhesive layer of the light control film is peeled off to expose the acrylic adhesive layer.

[0009] Next, the light control film with the exposed acrylic adhesive layer is temporarily attached on the coating of the application water formed by spraying.The light control film is then slid onto this coating of application water to align it.For example, if the glass is a window glass in a building, the light control film is aligned with the frame.At this time, the coating of application water is present between the acrylic adhesive layer and the glass surface and acts as a lubricant, allowing the light control film to slide easily.

[0010] After this alignment, strong pressure is applied with a squeegee or the like to expel the application water and air trapped between the acrylic pressure-sensitive adhesive layer and the glass surface, thereby achieving full adhesion. Note that even at this time, the film of application water mentioned above acts as a lubricant. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Japanese Patent Application Publication No. 2019-45612 Summary of the Invention [Problem to be solved by the invention]

[0012] However, this method requires a large amount of application water to be sprayed onto the glass surface to form the aforementioned coating of application water, which not only consumes a large amount of water but also poses the risk of exposing the living environment to water droplets when the glass is a window glass in a house, necessitating the evacuation of fixtures and fittings and the need to take measures to prevent flooding of the living environment during application work.

[0013] Furthermore, if air bubbles are trapped during temporary fastening, it is necessary to apply extremely strong pressure using a squeegee or the like to remove the air bubbles.

[0014] Therefore, an object of the present invention is to provide a light control film with a pressure-sensitive adhesive layer that can be easily applied to a glass surface. [Means for solving the problem]

[0015] As a means for solving the above problems, a first aspect of the present invention is a light control film that changes between a transparent state and an opaque state depending on whether or not a voltage is applied, a pressure-sensitive adhesive layer laminated on one surface of the light-control film; a release film that is peelably attached to the surface of the pressure-sensitive adhesive layer; A light-controlling film with a pressure-sensitive adhesive layer, the release film has a plastic film, The light control film with a pressure-sensitive adhesive layer is adhered to a glass surface of a window glass of a building or a mobile body by the pressure-sensitive adhesive layer from which the plastic film serving as the release film has been peeled off, The light control film with an adhesive layer is characterized in that the coefficient of static friction between the plastic film as the release film and the glass surface is 0.8 or less.

[0016] A second aspect is a light control film with a pressure-sensitive adhesive layer, characterized in that in the light control film according to the first aspect, the pressure-sensitive adhesive layer contains a thermoplastic elastomer.

[0017] Further, the third aspect is a light-control film with an adhesive layer, characterized in that in the light-control film described in the first or second aspect, the thickness of the plastic film serving as the release film is 188 μm or less.

[0018] Furthermore, a fourth aspect is a light-control film with an adhesive layer, characterized in that, in the light-control film described in any one of the first to third aspects, a cutting line is provided for cutting off at least a portion of the plastic film serving as the release film.

[0019] A fifth aspect is a light control film with an adhesive layer, characterized in that in the light control film according to the fourth aspect, the cut line penetrates the plastic film serving as the release film.

[0020] In addition, the sixth aspect is a light-control film with an adhesive layer, characterized in that, in the light-control film described in the fourth aspect, the cut line reaches halfway in the thickness direction of the plastic film serving as the release film.

[0021] In addition, the seventh aspect is a light-control film with an adhesive layer, characterized in that, in the light-control film described in any of the first to third aspects, embossed lines are provided for cutting out at least a portion of the plastic film serving as the release film.

[0022] The eighth aspect is a light-control film with an adhesive layer, characterized in that, in the light-control film described in any one of the fourth to seventh aspects, the cut lines or embossed lines are straight or wavy.

[0023] Furthermore, the ninth aspect is a light-control film with an adhesive layer, characterized in that, in the light-control film described in any one of the fourth to eighth aspects, the cut lines or embossed lines are solid lines or dashed lines.

[0024] Further, a method for attaching a light control film according to the present invention is a method for attaching a light control film with an adhesive layer to a glass surface, comprising the steps of: The light control film with a pressure-sensitive adhesive layer has a static friction coefficient between the plastic film serving as a release film and the glass surface of 0.8 or less, an edge pressure-sensitive adhesive layer exposing step of peeling off the plastic film as the release film of the pressure-sensitive adhesive layer-attached light control film at its edge to expose the pressure-sensitive adhesive layer at the edge; a positioning step of sliding the light control film with the pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer of which is exposed at the end by the edge pressure-sensitive adhesive layer exposing step, on a glass surface to position it; a temporary fixing step of temporarily fixing the pressure-sensitive adhesive layer-attached light control film positioned in the positioning step to a glass surface; and a bonding process in which the remaining plastic film as the release film is peeled off from the light control film with the pressure-sensitive adhesive layer temporarily fixed in the temporary fixing process, and the exposed pressure-sensitive adhesive layer is bonded to a glass surface. This is a method for attaching a light control film with an adhesive layer to a glass surface.

[0025] Furthermore, in the method for laminating a light control film according to the present invention, the light control film with an adhesive layer is characterized in that the glass is a window glass of a building or a window glass of a mobile body. [Effects of the Invention]

[0026] According to the present invention, there is provided a light control film with an adhesive layer that can be easily applied to a glass surface. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is an explanatory cross-sectional view of a light control film constituting a pressure-sensitive adhesive layer-attached light control film according to an embodiment of the present invention. [Figure 2] FIG. 2 is an explanatory cross-sectional view of an adhesive film constituting the adhesive layer-attached light control film according to an embodiment of the present invention. [Figure 3] FIG. 3 is an explanatory cross-sectional view of a release film constituting a pressure-sensitive adhesive layer-attached light control film according to an embodiment of the present invention. [Figure 4] FIG. 4 relates to a light control film with a pressure-sensitive adhesive layer according to an embodiment of the present invention, in which FIG. 4(a) is an explanatory cross-sectional view and FIG. 4(b) is an explanatory perspective view. [Figure 5] FIG. 5 relates to a light control film with a pressure-sensitive adhesive layer according to an embodiment of the present invention, and both FIG. 5(a) and FIG. 5(b) are explanatory perspective views for explaining a method of attaching the film to a glass surface. DETAILED DESCRIPTION OF THE INVENTION

[0028] The light control film with a pressure-sensitive adhesive layer of the present invention comprises three essential components: a light control film, a pressure-sensitive adhesive layer, and a release film.

[0029] The light control film has the property of changing between a transparent state and an opaque state depending on whether or not a voltage is applied, and any known light control film can be used.

[0030] The adhesive layer serves to adhere the light-controlling film to the glass surface, and the adhesive may be applied directly onto the light-controlling film, or the adhesive layer may be applied to an adhesive film substrate and then attached to the light-controlling film.

[0031] The release film also serves to protect the surface of the pressure-sensitive adhesive layer until the pressure-sensitive adhesive layer adheres to the glass surface. As will be described later, in the process of peeling off a part of the release film to expose the pressure-sensitive adhesive layer and sliding the pressure-sensitive adhesive layer-attached light control film in position while leaving the pressure-sensitive adhesive layer partially exposed, the release film protects the pressure-sensitive adhesive layer other than the part exposed for temporary attachment and allows it to slide easily and smoothly in contact with the glass surface.

[0032] Therefore, the following describes embodiments of the present invention with reference to the accompanying drawings. Fig. 1 is an explanatory cross-sectional view of a light control film 10 constituting a light control film 100 with an adhesive layer according to an embodiment of the present invention, Fig. 2 is an explanatory cross-sectional view of an adhesive film 20, and Fig. 3 is an explanatory cross-sectional view of a release film 30. Fig. 4(a) is an explanatory cross-sectional view of the light control film 100 with an adhesive layer, and Fig. 4(b) is an explanatory perspective view thereof.

[0033] As mentioned above, the light control film 10 may be a known light control film (see FIG. 1). This light control film 10 has a structure in which a liquid crystal layer 11 is sandwiched between two electrode films 12 and 13. As shown in the figure, the electrode film 12 has a transparent electrode 12b laminated on one side of a flexible transparent film 12a, with the transparent electrode 12b facing the liquid crystal layer 11. Similarly to the electrode film 12, the other electrode film 13 has a transparent electrode 13b laminated on one side of a flexible transparent film 13a, with the transparent electrode 13b facing the liquid crystal layer 11. Applying a voltage to these two electrodes 12b and 13b changes the optical properties of the liquid crystal layer 11. For example, applying a voltage makes the liquid crystal layer opaque and blocks light, whereas stopping the voltage application makes the liquid crystal layer transparent and allows light to pass through. Furthermore, depending on the type of liquid crystal, the film may be a light-control film in which the liquid crystal layer becomes transparent and transmits light when a voltage is applied, and the liquid crystal layer becomes opaque and blocks light when the voltage application is stopped.

[0034] Next, the adhesive film 20 is formed by laminating an adhesive layer 22 on one surface of an adhesive film substrate 21 and coating and laminating an adhesive layer 23 on the other surface.

[0035] The adhesive layer 22 is for bonding the pressure-sensitive adhesive film 20 to the light control film 10, and a strong adhesive such as a urethane adhesive or an acrylic adhesive can be used.

[0036] On the other hand, the adhesive layer 23 is for adhering the adhesive film 20 to the glass surface, and it is necessary to use an adhesive with a relatively low adhesive strength.

[0037] Specifically, when the adhesive layer 23 is adhered to a glass surface and left for 30 minutes in an environment of 23°C and 55% RH, the adhesion strength must be in the range of 0.01 to 0.41 N / 25 mm. If the adhesion strength is higher than this, it becomes difficult to slide the adhesive-layer-attached light control film for positioning while leaving part of the adhesive layer exposed. Therefore, in this case, as in the conventional method, it becomes necessary to spray a large amount of application water containing a surfactant onto the glass surface to form a thin film on the surface, then temporarily attach the film and slide it over this film to position it.

[0038] The adhesive used in the adhesive layer 23 can be, for example, a thermoplastic elastomer, such as a polyolefin-based thermoplastic elastomer.

[0039] Films in which this thermoplastic elastomer is coated and laminated on one side of an adhesive film substrate are commercially available as adhesive films, and this commercially available adhesive film can also be used as the adhesive film 20 by providing an adhesive layer 22 on the adhesive film substrate side. An example of a commercially available adhesive film that can be used is Gelpoly manufactured by Panac Corporation. This Gelpoly uses a polyester film of various thicknesses as the adhesive film substrate 21, and a polyolefin-based thermoplastic elastomer is coated on one side to form an adhesive layer 23. However, even with this Gelpoly, the adhesion strength to the glass surface varies depending on the product, so it is necessary to select a product with an adhesion strength in the range of 0.01 to 0.41 N / 25 mm.

[0040] Furthermore, since this gel poly has a protective release film attached to the surface of its adhesive layer 23, when applying it to the present invention, it is necessary to peel off and remove the protective release film and instead attach the release film 30 described below.

[0041] As shown in Fig. 3, the release film 30 can be constructed by laminating a release agent layer 32 on one side of a release film substrate 31. As described above, the release film 30 is attached to the adhesive layer 23 of the adhesive film 20 in an easily peelable manner, and protects the surface of the adhesive layer 23 until it is bonded to the glass surface. For this reason, the release agent layer 32 is laminated on the surface facing the adhesive layer 23.

[0042] On the other hand, the release film substrate 31 contacts the glass surface to which it is to be attached. As described below, this adhesive layer-attached light control film 100 is used by peeling off the release film 30 at its edge, leaving the adhesive layer 23 at that edge exposed, and sliding the adhesive layer-attached light control film 100 with the release film 30 laminated on the glass surface to position it. In this positioning process, the release film substrate 31 must contact the glass surface and slide smoothly. For this reason, the static friction coefficient between the release film substrate 31 and the glass surface to which it is to be attached must be 0.8 or less. If the static friction coefficient exceeds 0.8, it becomes difficult to slide the release film substrate 31 in the positioning process. If it is difficult to slide the release film substrate 31 in this way, a large amount of application water must be used in the positioning process, as in the conventional method. Preferably, the static friction coefficient is 0.8 or less.

[0043] A plastic film such as a polyester film can be suitably used as the release film substrate 31. However, the coefficient of static friction between the plastic film and the glass surface varies depending on the presence or absence, type, or amount of additives contained in the polyester film, the presence or absence and type of surface treatment, and also varies depending on the lot, etc. Therefore, it is desirable to select and use a commercially available film whose coefficient of static friction with the glass surface is 0.8 or less. However, if the film is too thick, it becomes difficult to attach or position it on the glass surface, so a thickness of 188 μm or less is desirable. An example of a commercially available film that can be used as the release film substrate 31 is Lumirror T60 from Toray Industries, Inc., which has a thickness of 30 to 188 μm.

[0044] Furthermore, silicone resin cured with various curing agents can be used as the release agent layer 32. For example, platinum-based curing agents can be used as the curing agent.

[0045] Next, a method for attaching this pressure-sensitive adhesive layer-attached light control film 100 to a glass surface will be described. Figures 5(a) and 5(b) are both explanatory perspective views for explaining a method for attaching the film to a glass surface.

[0046] This light control film 100 with an adhesive layer can be attached to a glass surface through an edge adhesive layer exposing step, a positioning step, a temporary fixing step, and an attachment step.

[0047] The edge adhesive layer exposing step is a step of peeling off the release film 30 of the adhesive layer-attached light control film 100 at its edge to expose the adhesive layer at the edge. For this step, it is desirable to provide a cut line 30x at the edge of the release film 30 so that it can be cut, as shown in Figure 5(a). The cut line 30x can be provided using a blade such as a cutter or scissors, but an embossed line formed by embossing may also be used instead of the cut line 30x.

[0048] In the illustrated example, the cut line 30x is linear and dashed, and has a depth that penetrates the release film 30 and reaches the surface of the pressure-sensitive adhesive layer 23, but this is not limited to this. For example, the cut line 30x may be a curved line such as a wavy line. Also, the cut line 30x may be a solid line instead of a dashed line. Furthermore, the cut line 30x may reach partway through the thickness direction of the release film 30 but not reach the surface of the pressure-sensitive adhesive layer 23. However, it is desirable that the release film 30 can be easily cut along this cut line 30x.

[0049] The cut lines 30x may be provided at the installation site where the light control film 10 is attached to the glass surface, but are preferably provided at the manufacturing factory that produces the adhesive layer-equipped light control film 100. If the cut lines 30x are provided at the manufacturing factory in this way and the adhesive layer-equipped light control film 100 with the cut lines 30x provided in this way is shipped, the work at the installation site will be easier.

[0050] In this edge pressure-sensitive adhesive layer exposing step, the release film 30 is cut along the cutting line 30x, and the release film 30 located on the edge side is removed to expose the edge pressure-sensitive adhesive layer 23a. Figure 5(b) shows this state.

[0051] Therefore, the next positioning step is a step in which the adhesive layer-attached light control film 100, with the release film 30 laminated thereon and the edge adhesive layer 23a left exposed, is placed on a glass surface and slid over this glass surface to position it. At this time, it is desirable that the exposed edge adhesive layer 23a does not come into contact with the glass surface, but because the adhesion between the adhesive layer 23 and the glass surface is relatively small, the adhesive layer-attached light control film 100 can be slid even if the two come into contact. Furthermore, because the static friction coefficient between the release film 30 and the glass surface is also small, it is easy to slide the adhesive layer-attached light control film 100.

[0052] Next, in the temporary fixing step, the positioned light control film 100 with an adhesive layer is adhered by the exposed edge adhesive layer 23a. As mentioned above, the adhesive strength between the adhesive layer 23 and the glass surface is relatively small, so if a mistake is made, it is possible to peel it off and re-attach it.

[0053] Finally, the lamination step is a step in which the remaining release film 30 is peeled off and removed from the light control film 100 with an adhesive layer that has been temporarily attached at the edges, and the light control film 100 with an adhesive layer is laminated to the glass surface using the exposed adhesive layer 23. Although the adhesion between the adhesive layer 23 and the glass surface is relatively small, the adhesion when left for 30 minutes in an environment of 23°C and 55% RH is in the range of 0.01 to 0.41 N / 25 mm, so the adhesion of the light control film 100 with an adhesive layer that has its entire surface laminated to the glass surface in this way is sufficient and it will not peel off inadvertently from the glass surface.

[0054] Typical examples of glass to which this pressure-sensitive adhesive layer-attached light control film 100 can be attached include window glass in buildings, or window glass in moving objects such as automobiles and trains. However, the present invention is not limited to these, and may also be applied to fixtures and the like. [Example]

[0055] The present invention will be described below with reference to examples and comparative examples.

[0056] These examples and comparative examples will be explained separately as follows: Process A, in which the adhesive layer-equipped light-control film 100 is manufactured at a manufacturing factory; Process B, in which the adhesive layer-equipped light-control film 100 is attached to the surface of the window glass at the construction site; and Result C, which explains the results.

[0057] Example 1 (A) Step of producing the light control film 100 with a pressure-sensitive adhesive layer To 100 parts by weight of addition polymerization type silicone resin (manufactured by Shin-Etsu Chemical Co., Ltd.: KS-841), 0.1 parts by weight of platinum-based curing agent (manufactured by Shin-Etsu Chemical Co., Ltd.: PL-50T) was added, and the mixture was further diluted with a mixed solvent of n-hexane and toluene to prepare a coating material for a release agent layer (coating material 311) with a solid content of 5% by weight.

[0058] A 38 μm thick polyester film (Lumirror T60 manufactured by Toray Industries, Inc.) was used as the release film substrate 31, and the release agent layer coating material 311 was applied to one side of the film, followed by drying and curing at 120° C. to produce the release film 30. The thickness of the resulting release agent layer 32 was 100 nm.

[0059] Next, we prepared Gelboli manufactured by Panac Corporation. This Gelboli is made of polyester film of various thicknesses as the adhesive film substrate 21, one side of which is coated with a polyolefin thermoplastic elastomer to form an adhesive layer 23, and a protective release film is attached to the surface of this adhesive layer 23.

[0060] Then, this protective release film was peeled off, and instead the release film 30 produced in the previous step was attached so that the release agent layer 31 faced the surface of the pressure-sensitive adhesive layer 23. In addition to this, an OCA (Optical Clear Adhesive) was bonded to the surface of the pressure-sensitive adhesive film substrate 21 as the adhesive layer 22 to produce a pressure-sensitive adhesive film 20 with the release film 30 attached. As the OCA, TD06A manufactured by Tomoegawa Paper Co., Ltd., in which release films were attached to both sides of the OCA layer, was used, and the attachment was performed by peeling off and removing one of the release films on both sides and adhering the exposed OCA layer to the surface of the pressure-sensitive adhesive film substrate 21.

[0061] A normal mode type light control film 10 (NW001 manufactured by Toppan Printing) was bonded to the adhesive layer 22 surface of the film obtained in the above process (adhesive film 20 with release film 30 bonded thereto) to produce a light control film 100 with an adhesive layer. That is, the release film protecting the OCA layer was peeled off and removed, and the exposed OCA layer was bonded to the light control film 10.

[0062] No cutting lines 30x are provided in this adhesive layer-attached light control film 100. Therefore, as will be explained next, cutting lines 30x are provided in this adhesive layer-attached light control film 100 at the installation site.

[0063] The release film 30 was peeled off and removed from the thus obtained light-controlling film 100 with an adhesive layer to expose the adhesive layer 23, and this adhesive layer 23 was brought into contact with the surface of blue glass and adhered.The adhesion strength (adhesion strength after storage) was measured in accordance with JIS Z-0237 after leaving it for 30 minutes in an environment of 23°C and 55 RH%, and was found to be 0.15 N / 25 mm.

[0064] The static friction coefficient between the release film 30 of the light control film 100 with a pressure-sensitive adhesive layer and the blue glass surface was 0.35. This static friction coefficient was measured using a Type 94i manufactured by Shinto Scientific Co., Ltd., with the light control film 100 with a pressure-sensitive adhesive layer and the blue glass surface together.

[0065] (B) Construction process The size of the light-receiving window to which the adhesive layer-attached light control film 100 was to be attached was set to 1 m x 1.5 m, and an adhesive layer-attached light control film 100 of 1 m x 1.5 m was prepared in accordance with this window size.

[0066] Then, using a blade, a cut line 30x was made in the release film 30 so as to form an isosceles right triangle with a side length of 0.5 m and with the corner as the vertex. The cut line 30x was a straight, solid line, and its depth was such that it penetrated the release film 30 and reached the surface of the pressure-sensitive adhesive layer 23.

[0067] Next, the release film 30 in the shape of a right-angled isosceles triangle located on the corner side of the cut line 30x was removed to expose the pressure-sensitive adhesive layer 23 at this position.

[0068] The light-controlling film 100 with the adhesive layer, with the end adhesive layer 23a exposed in this manner, was placed on the glass surface of the light-receiving window so that its release film substrate (polyester film) 31 was in contact with the glass surface, and was slid over the glass surface to position it.

[0069] Then, the light control film 100 with the adhesive layer positioned on the glass surface was temporarily attached by adhering the exposed edge adhesive layer 23a to the glass surface. Note that the adhesive portion of the light control film 100 with the adhesive layer temporarily attached in this manner was easy to peel off, and therefore the positioning and temporary attachment could be repeated many times.

[0070] Finally, the remaining release film 30 was peeled off, and the exposed adhesive layer 23 was adhered to the glass surface, and the entire adhesive layer-attached light control film 100 was bonded to the glass surface. At this time, the adhesive layer-attached light control film 100 was bonded from the temporarily attached end to the other end while automatically removing air. Therefore, no air bubbles remained between the bonded adhesive layer-attached light control film 100 and the glass surface.

[0071] (C)Result As described above, in this example, it was confirmed that the film could be attached to the glass surface of a light-receiving window without the need for application water, and that the positioning and temporary fastening could be repeated many times. Furthermore, by exposing a portion of the adhesive layer 23 and aligning and laminating the film using the edge adhesive layer 23a, the film could be attached. Furthermore, in the lamination process in which the entire light-control film 100 with the adhesive layer is attached, the lamination process proceeds while automatically excluding air, so there is no need to apply strong pressure in any of the positioning, temporary fastening, and lamination processes. Therefore, each of these processes can be easily carried out without damaging the light-control film 10.

[0072] Example 2 (A) Step of producing the light control film 100 with a pressure-sensitive adhesive layer A light control film 100 with a pressure-sensitive adhesive layer was produced in the same manner as in Example 1, except that a polyester film (Lumirror T60 manufactured by Toray Industries, Inc.) with a thickness of 125 μm was used as the release film substrate 31 .

[0073] As in Example 1, the adhesive strength after storage between the adhesive layer 23 of the thus obtained adhesive layer-attached light control film 100 and the blue glass surface was 0.34 N / 25 mm.

[0074] The coefficient of static friction between the release film 30 of the light control film 100 with a pressure-sensitive adhesive layer and the blue glass surface was 0.60.

[0075] (B) Construction process As in Example 1, the film was attached to the glass surface of a light-receiving window.

[0076] (C)Result As in Example 1, the light control film 10 could be attached to the glass surface of the light-receiving window without the need for application water, and the positioning and temporary fixing could be repeated many times. Furthermore, no strong pressure was required in any of the positioning, temporary fixing, and bonding processes, so each of these processes could be carried out easily and without damaging the light control film 10.

[0077] Example 3 (A) Step of producing the light control film 100 with a pressure-sensitive adhesive layer A light control film 100 with a pressure-sensitive adhesive layer was produced in the same manner as in Example 1, except that a polyester film (Lumirror T60 manufactured by Toray Industries, Inc.) with a thickness of 188 μm was used as the release film substrate 31 .

[0078] As in Example 1, the post-storage adhesion between the pressure-sensitive adhesive layer 23 of the pressure-sensitive adhesive layer-attached light control film 100 thus obtained and the blue glass surface was 0.01 N / 25 mm.

[0079] The coefficient of static friction between the release film 30 of the light control film 100 with a pressure-sensitive adhesive layer and the blue glass surface was 0.35.

[0080] (B) Construction process As in Example 1, the film was attached to the glass surface of a light-receiving window.

[0081] (C)Result As in Example 1, the light control film 10 could be attached to the glass surface of the light-receiving window without the need for application water, and the positioning and temporary fixing could be repeated many times. Furthermore, no strong pressure was required in any of the positioning, temporary fixing, and bonding processes, so each of these processes could be carried out easily and without damaging the light control film 10.

[0082] Example 4 (A) Step of producing the light control film 100 with a pressure-sensitive adhesive layer A light control film 100 with a pressure-sensitive adhesive layer was manufactured in the same manner as in Example 1. However, in this example, the cut line 30x was formed at the manufacturing factory. As in Example 1, the cut line 30x was formed using a blade so as to form a right-angled isosceles triangle with sides of 0.5 m and vertices at the corners of the light control film 100 with a pressure-sensitive adhesive layer, and was a straight, solid line with a depth that penetrated the release film 30 and reached the surface of the pressure-sensitive adhesive layer 23.

[0083] As in Example 1, the post-storage adhesion between the pressure-sensitive adhesive layer 23 of the pressure-sensitive adhesive layer-attached light control film 100 thus obtained and the blue glass surface was 0.29 N / 25 mm.

[0084] The static friction coefficient between the release film 30 of the light control film 100 with a pressure-sensitive adhesive layer and the blue glass surface was 0.52.

[0085] (B) Construction process As described above, the film was attached to the glass surface of the light-receiving window in the same manner as in Example 1, except that the step of forming the cutting lines 30x was carried out in the manufacturing factory.

[0086] (C)Result As in Example 1, the light control film 10 could be attached to the glass surface of the light-receiving window without the need for application water, and the positioning and temporary fixing could be repeated many times. Furthermore, no strong pressure was required in any of the positioning, temporary fixing, and bonding processes, so each of these processes could be carried out easily and without damaging the light control film 10.

[0087] In this example, the process of forming the cut line 30x was carried out at the manufacturing factory, so no cutting tools such as cutters or scissors were required at the construction site, which confirmed that this was extremely convenient.

[0088] Example 5 (A) Step of producing the light control film 100 with a pressure-sensitive adhesive layer A light control film 100 with a pressure-sensitive adhesive layer was manufactured in the same manner as in Example 1. However, in this example, the cut lines 30x were formed at the manufacturing factory. As in Example 1, the cut lines 30x were formed using a blade so as to form right-angled isosceles triangles with sides of 0.5 m and vertices at the corners of the light control film 100 with a pressure-sensitive adhesive layer. Furthermore, as in Example 1, the cut lines 30x were straight and solid lines, but their depths did not penetrate the release film 30 but reached partway through its thickness, and varied in the range of 3 to 30 μm.

[0089] As in Example 1, the post-storage adhesion between the pressure-sensitive adhesive layer 23 of the pressure-sensitive adhesive layer-attached light control film 100 thus obtained and the blue glass surface was 0.21 N / 25 mm.

[0090] The coefficient of static friction between the release film 30 of the light control film 100 with a pressure-sensitive adhesive layer and the blue glass surface was 0.45.

[0091] (B) Construction process As described above, the film was attached to the glass surface of the light-receiving window in the same manner as in Example 1, except that the step of forming the cutting lines 30x was carried out in the manufacturing factory.

[0092] (C)Result As in Example 1, the light control film 10 could be attached to the glass surface of the light-receiving window without the need for application water, and the positioning and temporary fixing could be repeated many times. Furthermore, no strong pressure was required in any of the positioning, temporary fixing, and bonding processes, so each of these processes could be carried out easily and without damaging the light control film 10.

[0093] In this example, the process of forming the cut line 30x was carried out at the manufacturing factory, so no cutting tools such as cutters or scissors were required at the construction site, which confirmed that this was extremely convenient.

[0094] Example 6 (A) Step of producing the light control film 100 with a pressure-sensitive adhesive layer A light control film 100 with a pressure-sensitive adhesive layer was manufactured in the same manner as in Example 1. However, in this example, the cut lines 30x were formed at the manufacturing factory. As in Example 1, the cut lines 30x were formed using a blade to form right-angled isosceles triangles with sides of 0.5 m and vertices at the corners of the light control film 100 with a pressure-sensitive adhesive layer. The cut lines 30x were linear, as in Example 1, but perforated. The depth of the cut lines was measured so as to reach partway through the thickness direction of the release film 30 without penetrating it, and varied in the range of 3 to 30 μm.

[0095] As in Example 1, the post-storage adhesion between the pressure-sensitive adhesive layer 23 of the pressure-sensitive adhesive layer-attached light control film 100 thus obtained and the blue glass surface was 0.41 N / 25 mm.

[0096] The coefficient of static friction between the release film 30 of the light control film 100 with a pressure-sensitive adhesive layer and the blue glass surface was 0.45.

[0097] (B) Construction process As described above, the film was attached to the glass surface of the light-receiving window in the same manner as in Example 1, except that the step of forming the cutting lines 30x was carried out in the manufacturing factory.

[0098] (C)Result As in Example 1, the light control film 10 could be attached to the glass surface of the light-receiving window without the need for application water, and the positioning and temporary fixing could be repeated many times. Furthermore, no strong pressure was required in any of the positioning, temporary fixing, and bonding processes, so each of these processes could be carried out easily and without damaging the light control film 10.

[0099] In this example, the process of forming the cut line 30x was carried out at the manufacturing factory, so no cutting tools such as cutters or scissors were required at the construction site, which confirmed that this was extremely convenient.

[0100] Example 7 (A) Step of producing the light control film 100 with a pressure-sensitive adhesive layer A light control film 100 with a pressure-sensitive adhesive layer was manufactured in the same manner as in Example 1. However, in this example, embossed lines were formed in place of the cut lines 30x at the manufacturing factory. The embossed lines were formed in a straight, solid shape using a metal embossing roll. Like the cut lines 30x in Example 1, these embossed lines were provided so as to form a right-angled isosceles triangle with sides of 0.5 m and vertices at the corners of the light control film 100 with a pressure-sensitive adhesive layer. The cut lines 30x were straight like those in Example 1, but in the form of perforations.

[0101] As in Example 1, the post-storage adhesion between the pressure-sensitive adhesive layer 23 of the pressure-sensitive adhesive layer-attached light control film 100 thus obtained and the blue glass surface was 0.29 N / 25 mm.

[0102] The coefficient of static friction between the release film 30 of the light control film 100 with a pressure-sensitive adhesive layer and the blue glass surface was 0.50.

[0103] (B) Construction process As mentioned above, the embossed lines were formed at the manufacturing factory, so no cut lines were formed at the construction site. Then, in the (B2) edge pressure-sensitive adhesive layer 23a exposing step, the release film 30 in the shape of a right-angled isosceles triangle located on the corner side of the embossed line was removed to expose the pressure-sensitive adhesive layer 23 at this position. At this time, the release film 30 could be easily peeled off by hand.

[0104] Except for the above points, the film was attached to the glass surface of the light-receiving window in the same manner as in Example 1.

[0105] (C)Result As in Example 1, the light control film 10 could be attached to the glass surface of the light-receiving window without the need for application water, and the positioning and temporary fixing could be repeated many times. Furthermore, no strong pressure was required in any of the positioning, temporary fixing, and bonding processes, so each of these processes could be carried out easily and without damaging the light control film 10.

[0106] In this example, the process of forming the cut line 30x was carried out at the manufacturing factory, so no cutting tools such as cutters or scissors were required at the construction site, which confirmed that this was extremely convenient.

[0107] Example 8 In this example, a thick film is used as the release film substrate 31.

[0108] (A) Step of producing the light control film 100 with a pressure-sensitive adhesive layer A polyester film (Lumirror T60, manufactured by Toray Industries, Inc.) having a thickness of 250 μm was used as the release film substrate 31. In other respects, a light control film 100 with a pressure-sensitive adhesive layer was produced in the same manner as in Example 1.

[0109] As in Example 1, the post-storage adhesion between the pressure-sensitive adhesive layer 23 of the pressure-sensitive adhesive layer-attached light control film 100 thus obtained and the blue glass surface was 0.35 N / 25 mm.

[0110] The static friction coefficient between the release film 30 of the pressure-sensitive adhesive layer-attached light control film 100 and the blue glass surface was 1.50.

[0111] (B) Construction process As in Example 1, we first attempted to create a cut line 30x at the corner of the adhesive layer-attached light-control film 100, but because the release film substrate 31 was as thick as 250 μm, we adjusted it to the specified size in advance rather than cutting it at the construction site.

[0112] In addition, we tried peeling off the entire release film 30 to expose the entire adhesive layer 23 and then adjusting the position while bonding the pieces together, but we were unable to move the adhesive layer 23 that was adhered to the glass surface, so we had to be careful in the positioning process.

[0113] For this reason, positioning and lamination were carried out using 1 liter of construction water as a lubricant and a squeegee.

[0114] (C)Result In Example 8, a light control film with a thickness of 200 μm or more was used compared to the other Examples. Therefore, construction was carried out using construction water with caution. In addition, because of the thickness, strong pressure was applied to remove air bubbles, and damage to the light control film 10, although slight, was confirmed. However, after construction, a light control glass window that was practically usable was provided, just like the other Examples.

[0115] (Comparative Example 1) In this example, a release film 30 having a large coefficient of static friction with the glass surface is used.

[0116] (A) Step of producing the light control film 100 with a pressure-sensitive adhesive layer To 50 parts by weight of addition polymerization type silicone resin (DuPont Toray Specialty Materials Co., Ltd.: LTC-750A), 50 parts by weight of release modifier (DuPont Toray Specialty Materials Co., Ltd.: SD7292) and 0.1 parts by weight of platinum-based curing agent (Shin-Etsu Chemical Co., Ltd.: SRX-212) were added, and the mixture was further diluted with a mixed solvent of n-hexane and toluene to prepare a release agent layer coating (Coating 312) with a solids content of 2% by weight.

[0117] A 100 μm thick polyethylene film was used as the release film substrate 31, and one side of the film was subjected to a corona discharge treatment. The coating material 312 for the release agent layer was then applied to the treated surface, dried at 40° C., and cured by irradiating with ultraviolet light using an ultraviolet irradiation device (Fusion H Bulb), to produce the release film 30. The thickness of the resulting release agent layer 32 was 100 nm.

[0118] In other respects, the pressure-sensitive adhesive layer-attached light control film 100 was produced in the same manner as in Example 1.

[0119] As in Example 1, the post-storage adhesion between the pressure-sensitive adhesive layer 23 of the pressure-sensitive adhesive layer-attached light control film 100 thus obtained and the blue glass surface was 0.19 N / 25 mm.

[0120] The coefficient of static friction between the release film 30 of the light control film 100 with a pressure-sensitive adhesive layer and the blue glass surface was 0.85.

[0121] (B) Construction process First, similarly to Example 1, a cut line 30x was provided at a corner of the light control film 100 with a pressure-sensitive adhesive layer. Similar to Example 1, the cut line 30x was formed using a blade so as to form a right-angled isosceles triangle with sides of 0.5 m and vertices at the corners of the light control film 100 with a pressure-sensitive adhesive layer, and was a straight, solid line with a depth that penetrated the release film 30 and reached the surface of the pressure-sensitive adhesive layer 23.

[0122] Next, the release film 30 in the shape of a right-angled isosceles triangle located on the corner side of the cut line 30x was removed to expose the pressure-sensitive adhesive layer 23 at this position.

[0123] Then, the light control film 100 with the adhesive layer, with the edge adhesive layer 23a exposed in this way, was placed on the glass surface of the light-receiving window so that its release film substrate (polyethylene film) 31 was in contact with the glass surface, and an attempt was made to position it by sliding it over the glass surface, as in Example 1. However, the release film 30 did not slide well on the glass surface, and positioning was not possible.

[0124] Therefore, we had no choice but to peel off the entire release film 30 to expose the entire adhesive layer 23, and then tried to bond the pieces while adjusting their position, but we were unable to move the adhesive layer 23 adhered to the glass surface, and were therefore unable to position it properly.

[0125] For this reason, positioning and lamination were carried out using 1 liter of construction water as a lubricant and a squeegee.

[0126] (C)Result In this example, it was not possible to attach the film to the glass surface of the light-receiving window without using application water. Therefore, the positioning process, temporary fixing process, and lamination process were not easy. In addition, because it was necessary to apply strong pressure to remove air bubbles, slight damage to the light control film 10 was confirmed.

[0127] (Comparative Example 2) This example also uses a release film 30 that has a large coefficient of static friction with the glass surface.

[0128] (A) Step of producing the light control film 100 with a pressure-sensitive adhesive layer A 50 μm thick unstretched polypropylene film (Pylane CT P1146, manufactured by Toyobo Co., Ltd.) was used as the release film substrate 31, and one side of the film was subjected to a corona discharge treatment. The release agent layer coating material 312 used in Comparative Example 1 was then applied to the treated surface, dried at 40° C., and cured by irradiating with ultraviolet light using an ultraviolet irradiation device (Fusion H Bulb), to produce a release film 30. In other respects, a light control film 100 with an adhesive layer was produced in the same manner as in Example 1.

[0129] As in Example 1, the post-storage adhesion between the pressure-sensitive adhesive layer 23 of the pressure-sensitive adhesive layer-attached light control film 100 thus obtained and the blue glass surface was 0.21 N / 25 mm.

[0130] The coefficient of static friction between the release film 30 of the pressure-sensitive adhesive layer-attached light control film 100 and the blue glass surface was 0.90.

[0131] (B) Construction process As in Example 1, a cut line 30x was made at the corner of the adhesive layer-attached light-control film 100, and the release film 30 was removed to expose the end adhesive layer 23a in the shape of a right-angled isosceles triangle with sides of 0.5 m, with the corner of the adhesive layer-attached light-control film 100 as the vertex.

[0132] Then, as in Example 1, this light control film 100 with a pressure-sensitive adhesive layer was placed on the glass surface of a light-receiving window, and an attempt was made to slide it over the glass surface to position it. However, the release film 30 did not slide well on the glass surface, and positioning was not possible. In addition, an attempt was made to peel off the entire release film 30 to expose the entire pressure-sensitive adhesive layer 23 and to attach it while adjusting the position, but the pressure-sensitive adhesive layer 23 adhered to the glass surface could not be moved, and positioning was not possible.

[0133] For this reason, positioning and lamination were carried out using 1 liter of construction water as a lubricant and a squeegee.

[0134] (C)Result In this example, the results were similar to those of Comparative Example 1. That is, it was not possible to bond the film to the glass surface of the light-receiving window without using application water. Therefore, none of the positioning process, temporary fixing process, and bonding process were easy, and because it was necessary to apply strong pressure to remove air bubbles, slight damage to the light control film 10 was confirmed.

[0135] (Comparative Example 3) This example also uses a release film 30 that has a large coefficient of static friction with the glass surface.

[0136] (A) Step of producing the light control film 100 with a pressure-sensitive adhesive layer A polyester film with a 43 μm thick acrylic hard coat layer on one side (PET CHC, manufactured by Toppan Printing Co., Ltd.) was used as the release film substrate 31, and the paint for the release agent layer 311 used in Example 1 was applied to the polyester film surface, followed by drying and curing at 120°C to produce a release film 30. The thickness of the resulting release agent layer 32 was 100 nm. The reason for using a film with an acrylic hard coat layer as the release film substrate 31 was to prevent scratches from occurring on the release film 30 during transportation from the manufacturing factory to the construction site.

[0137] In other respects, the same procedure as in Example 1 was followed to produce a pressure-sensitive adhesive layer-attached light control film 100.

[0138] As in Example 1, the post-storage adhesion between the pressure-sensitive adhesive layer 23 of the pressure-sensitive adhesive layer-attached light control film 100 thus obtained and the blue glass surface was 0.35 N / 25 mm.

[0139] The static friction coefficient between the release film 30 of the pressure-sensitive adhesive layer-attached light control film 100 and the blue glass surface was 1.50.

[0140] (B) Construction process As in Example 1, a cut line 30x was made at the corner of the adhesive layer-attached light-control film 100, and the release film 30 was removed to expose the end adhesive layer 23a in the shape of a right-angled isosceles triangle with sides of 0.5 m, with the corner of the adhesive layer-attached light-control film 100 as the vertex.

[0141] Then, as in Example 1, this light control film 100 with a pressure-sensitive adhesive layer was placed on the glass surface of a light-receiving window, and an attempt was made to slide it over the glass surface to position it. However, the release film 30 did not slide well on the glass surface, and positioning was not possible. In addition, an attempt was made to peel off the entire release film 30 to expose the entire pressure-sensitive adhesive layer 23 and to attach it while adjusting the position, but the pressure-sensitive adhesive layer 23 adhered to the glass surface could not be moved, and positioning was not possible.

[0142] For this reason, positioning and lamination were carried out using 1 liter of construction water as a lubricant and a squeegee.

[0143] (C)Result In this example, the results were similar to those of Comparative Examples 1 and 2. That is, it was not possible to bond the film to the glass surface of the light-receiving window without using application water. For this reason, none of the positioning process, temporary fixing process, and bonding process were easy, and because it was necessary to apply strong pressure to remove air bubbles, slight damage to the light control film 10 was confirmed.

[0144] Therefore, it was found that the coefficient of static friction between the release film 30 and the blue glass surface is important in order to slide and position the adhesive layer-attached light control film 100 on the glass surface without the need for application water.

[0145] Example 9 This example uses an adhesive layer 23 that has a strong adhesive force to the glass surface.

[0146] (A) Step of producing the light control film 100 with a pressure-sensitive adhesive layer First, the release film 30 was produced in the same manner as in Example 1.

[0147] Next, 100 parts by weight of acrylic adhesive paint (manufactured by Saiden Chemical Co., Ltd.: OC3949) was mixed with 0.5 parts by weight of hardener (manufactured by Saiden Chemical Co., Ltd.: K130), 0.5 parts by weight of silane coupling agent ( 0.5 parts by weight of S-1 (manufactured by Saiden Chemical Co., Ltd.) was added, and the mixture was further diluted with ethyl acetate as a solvent to prepare a coating material for adhesive layer (Coating material 231) with a solid content of 30% by weight.

[0148] Using a comma coater, this adhesive layer coating material 231 was applied to a 38 μm thick light-release film (E7002, manufactured by Toyobo Co., Ltd.), then dried at 100°C for 2 minutes and further aged at 40°C for 48 hours to form the adhesive layer 23.

[0149] Then, this adhesive layer 23 was transferred onto the release agent layer 32 surface of the release film 30 .

[0150] Next, a normal mode type light control film 10 (NW001 manufactured by Toppan Printing) was attached to the surface of the adhesive layer 23 to produce an adhesive layer-attached light control film 100. This adhesive layer-attached light control film 100 has an adhesive layer 23 and a release film 30 laminated in this order on one surface of the light control film 100.

[0151] Then, as in Example 1, the adhesion strength after storage between the adhesive layer 23 of the adhesive layer-attached light-control film 100 thus obtained and the blue glass surface was measured, and the adhesion strength after storage was 6.4 N / 25 mm.

[0152] The coefficient of static friction between the release film 30 of the light control film 100 with a pressure-sensitive adhesive layer and the blue glass surface was 0.45.

[0153] (B) Construction process As in Example 1, a cut line 30x was made at the corner of the adhesive layer-attached light-control film 100, and the release film 30 was removed to expose the end adhesive layer 23a in the shape of a right-angled isosceles triangle with sides of 0.5 m, with the corner of the adhesive layer-attached light-control film 100 as the vertex.

[0154] Then, in the same manner as in Example 1, this pressure-sensitive adhesive layer-attached light control film 100 was placed on the glass surface of a light-receiving window, and slid over the glass surface to position it.

[0155] Next, when an attempt was made to temporarily attach the thus-positioned adhesive-layered light control film 100 to a glass surface using its edge adhesive layer 23a, part of the edge adhesive layer 23a adhered strongly to the glass surface, and air bubbles formed between the edge adhesive layer 23a and the glass surface. This made it impossible to align and attach the edge adhesive layer 23a to the glass surface. Therefore, using 1 liter of application water and an application squeegee, the edge adhesive layer 23a was temporarily attached to the glass surface while applying strong pressure with the application squeegee to push out the air bubbles.

[0156] Finally, the remaining release film 30 was peeled off and the exposed adhesive layer 23 was adhered to the glass surface, and the entire adhesive layer-attached light control film 100 was stuck to the glass surface. Note that this also required 2 liters of application water and strong pressure using an application squeegee.

[0157] (C)Result In this example, too, it was not possible to bond the film to the glass surface of the light-receiving window without using application water. As a result, the positioning process, temporary fixing process, and bonding process were all extremely troublesome, and damage to the light control film 10 was confirmed because it was necessary to apply strong pressure to remove air bubbles.

[0158] Example 10 This example also uses an adhesive layer 23 that has a strong adhesive force to the glass surface.

[0159] (A) Step of producing the light control film 100 with a pressure-sensitive adhesive layer To 100 parts by weight of an acrylic adhesive paint (OC3949 manufactured by Saiden Chemical Co., Ltd.), 0.5 parts by weight of a curing agent (K130 manufactured by Saiden Chemical Co., Ltd.), 0.5 parts by weight of a silane coupling agent (S-1 manufactured by Saiden Chemical Co., Ltd.), and 100 parts by weight of an ultraviolet absorber (TINUVIN109 manufactured by BASF Japan Ltd.) were added, and the mixture was further diluted with ethyl acetate as a solvent to prepare a paint for adhesive layers (paint 232) with a solids content of 30% by weight.

[0160] A light control film 100 with an adhesive layer was produced in the same manner as in Example 9, except that this adhesive layer coating material 232 was used instead of the adhesive layer coating material 231.

[0161] Then, as in Example 1, the adhesion strength after storage between the adhesive layer 23 of the adhesive layer-attached light-control film 100 thus obtained and the blue glass surface was measured, and the adhesion strength after storage was 3.0 N / 25 mm.

[0162] The static friction coefficient between the release film 30 of the pressure-sensitive adhesive layer-attached light control film 100 and the blue glass surface was 0.40.

[0163] (B) Construction process The same procedure was followed as in Example 9 when this adhesive-layered light control film 100 was attached to the glass surface of a light-receiving window. Specifically, when an attempt was made to temporarily attach the positioned adhesive-layered light control film 100 to the glass surface using its edge adhesive layer 23a, part of the edge adhesive layer 23a strongly adhered to the glass surface, resulting in the formation of air bubbles between the edge adhesive layer 23a and the glass surface. Therefore, 1 liter of application water and strong pressure from an application squeegee were required to temporarily attach the edge adhesive layer 23a to the glass surface. Furthermore, 2 liters of application water and strong pressure from an application squeegee were also required to peel off and remove the remaining release film 30 and attach the entire adhesive-layered light control film 100.

[0164] (C)Result In this example, too, it was not possible to bond the film to the glass surface of the light-receiving window without using application water. As a result, the positioning process, temporary fixing process, and bonding process were all extremely troublesome, and damage to the light control film 10 was confirmed because it was necessary to apply strong pressure to remove air bubbles.

[0165] Example 11 This example also uses an adhesive layer 23 that has a strong adhesive force to the glass surface. In this example, a thick film is used as the release film substrate 31.

[0166] (A) Step of producing the light control film 100 with a pressure-sensitive adhesive layer The paint for the release agent layer was the paint 311 used in Example 1. That is, 0.1 parts by weight of a platinum-based curing agent (PL-50T, manufactured by Shin-Etsu Chemical Co., Ltd.) was added to 100 parts by weight of an addition polymerization type silicone resin (KS-841, manufactured by Shin-Etsu Chemical Co., Ltd.), and the mixture was further diluted with a mixed solvent of n-hexane and toluene to prepare paint 311 for the release agent layer with a solid content of 5% by weight.

[0167] A polyester film (Lumirror T60, manufactured by Toray Industries, Inc.) having a thickness of 250 μm was used as the release film substrate 31, and the coating material for the release agent layer 311 was applied to one side of the film, followed by drying and curing at 120° C. to produce the release film 30. The thickness of the resulting release agent layer 32 was 100 nm.

[0168] Next, the paint 231 used in Example 9 was used as the paint for the adhesive layer. That is, 0.5 parts by weight of a curing agent (K130, manufactured by Saiden Chemical Co., Ltd.) and 0.5 parts by weight of a silane coupling agent (S-1, manufactured by Saiden Chemical Co., Ltd.) were added to 100 parts by weight of an acrylic adhesive paint (OC3949, manufactured by Saiden Chemical Co., Ltd.), and the mixture was further diluted with ethyl acetate as a solvent to prepare paint 231 for the adhesive layer with a solid content of 30% by weight.

[0169] Then, this adhesive layer coating material 231 was applied onto a 38 μm thick light release film (manufactured by Toyobo Co., Ltd.: E7002) to form an adhesive layer 23.

[0170] Then, this adhesive layer 23 was transferred onto the release agent layer 32 surface of the release film 30 .

[0171] Next, a normal mode type light control film 10 (NW001 manufactured by Toppan Printing) was attached to the surface of the adhesive layer 23 to produce an adhesive layer-attached light control film 100. This adhesive layer-attached light control film 100 has an adhesive layer 23 and a release film 30 laminated in this order on one surface of the light control film 100.

[0172] Then, as in Example 1, the adhesion strength after storage between the adhesive layer 23 of the adhesive layer-attached light-control film 100 thus obtained and the blue glass surface was measured, and the adhesion strength after storage was 8.9 N / 25 mm.

[0173] The static friction coefficient between the release film 30 of the pressure-sensitive adhesive layer-attached light control film 100 and the blue glass surface was 0.40.

[0174] (B) Construction process As in Example 1, we first attempted to create a cut line 30x at the corner of the adhesive layer-attached light control film 100, but because the release film substrate 31 was as thick as 250 μm, it was not possible to cut it at the construction site.

[0175] For this reason, the release film 30 was completely peeled off to expose the entire adhesive layer 23, and a large amount of application water (30 liters) was used, and while adjusting the position, strong pressure was applied with a squeegee to bond it to the glass surface. The reason why such a large amount of application water is required is because the positioning and air bubble removal were carried out simultaneously, and strong adhesive was applied to a large area in one go.

[0176] (C)Result In this example, too, it was not possible to apply the film to the glass surface of the light-receiving window without using application water. Moreover, because the positioning and application had to be done simultaneously, and strong adhesive was applied to a large area all at once, the application process was time-consuming and extremely difficult. Furthermore, the damage to the light-control film 10 was significant.

[0177] Example 12 This example also uses an adhesive layer 23 that has a strong adhesive force to the glass surface. Also in this example, a thick film is used as the release film substrate 31.

[0178] (A) Step of producing the light control film 100 with a pressure-sensitive adhesive layer The release film 30 used was the same as the release film of Example 11. That is, 0.1 parts by weight of a platinum-based curing agent (PL-50T, manufactured by Shin-Etsu Chemical Co., Ltd.) was added to 100 parts by weight of an addition polymerization type silicone resin (KS-841, manufactured by Shin-Etsu Chemical Co., Ltd.), and the mixture was further diluted with a mixed solvent of n-hexane and toluene to prepare a coating material 311 for a release agent layer with a solid content of 5% by weight. A polyester film (Lumirror T60, manufactured by Toray Industries, Inc.) having a thickness of 250 μm was used as the release film substrate 31, and the coating material 311 for a release agent layer was applied to one side of the film to produce the release film 30.

[0179] Furthermore, the paint 232 used in Example 10 was used as the paint for the adhesive layer. Specifically, 100 parts by weight of an acrylic adhesive paint (manufactured by Saiden Chemical Co., Ltd.: OC3949) was mixed with 0.5 parts by weight of a curing agent (manufactured by Saiden Chemical Co., Ltd.: K130), 0.5 parts by weight of a silane coupling agent (manufactured by Saiden Chemical Co., Ltd.: S-1), and 100 parts by weight of an ultraviolet absorber (manufactured by BASF Japan Ltd.: TINUVIN109), and the resulting mixture was diluted with ethyl acetate as a solvent to prepare a paint for the adhesive layer (paint 232) with a solids content of 30% by weight.

[0180] Then, this adhesive layer coating material 231 was applied onto a 38 μm thick light release film (manufactured by Toyobo Co., Ltd.: E7002) to form an adhesive layer 23.

[0181] Next, a normal mode type light control film 10 (NW001 manufactured by Toppan Printing Co., Ltd.) was attached to the surface of the adhesive layer 23 to produce an adhesive layer-attached light control film 100. This adhesive layer-attached light control film 100 has an adhesive layer 23 and a release film 30 laminated in this order on one surface of the light control film 100.

[0182] Then, as in Example 1, the adhesion strength after storage between the adhesive layer 23 of the adhesive layer-attached light-control film 100 thus obtained and the blue glass surface was measured, and the adhesion strength after storage was 2.5 N / 25 mm.

[0183] The static friction coefficient between the release film 30 of the light control film 100 with a pressure-sensitive adhesive layer and the blue glass surface was 0.43.

[0184] (B) Construction process As in Example 1, we first attempted to create a cut line 30x at the corner of the adhesive layer-attached light control film 100, but because the release film substrate 31 was as thick as 250 μm, it was not possible to cut it at the construction site.

[0185] For this reason, the release film 30 was completely peeled off to expose the entire adhesive layer 23, and a large amount of application water (30 liters) was used, and while adjusting the position, strong pressure was applied with a squeegee to bond it to the glass surface. The reason why such a large amount of application water is required is because the positioning and air bubble removal were carried out simultaneously, and strong adhesive was applied to a large area in one go.

[0186] (C)Result In this example, the results were similar to those of Example 11. That is, it was not possible to bond the film to the glass surface of the light-receiving window without using application water. Moreover, since the positioning and bonding had to be performed simultaneously, and strong adhesive was applied to a large area in one go, the application process was time-consuming and extremely difficult. In addition, the damage to the light-control film 10 was significant.

[0187] The above results are summarized in Table 1.

[0188] [Table 1] [Explanation of symbols]

[0189] 100: Light-controlling film with adhesive layer 10: Light control film 11: Liquid crystal layer 12: Electrode film 12a:Transparent film 12b: Transparent electrode 13: Electrode film 13a: Transparent film 13b: Transparent electrode 20: Adhesive film 21: Adhesive film base 22: Adhesive layer 23: Adhesive layer 23: Edge adhesive layer 30: Release film 31: Release film substrate 32: Release agent layer 30x: Cutting line

Claims

1. A light-control film that changes between a transparent state and an opaque state depending on whether or not a voltage is applied. a pressure-sensitive adhesive layer laminated on one surface of the light-control film; a release film that is peelably attached to the surface of the pressure-sensitive adhesive layer; A light-controlling film with a pressure-sensitive adhesive layer, the release film has a plastic film, The light control film with a pressure-sensitive adhesive layer is adhered to a glass surface of a window glass of a building or a mobile body by the pressure-sensitive adhesive layer from which the plastic film serving as the release film has been peeled off, A light control film with an adhesive layer, characterized in that the coefficient of static friction between the plastic film as the release film and the glass surface is 0.8 or less.

2. 2. The light control film with an adhesive layer according to claim 1, wherein the thickness of the plastic film serving as the release film is 188 μm or less.

3. 3. The light control film with an adhesive layer according to claim 1, wherein the adhesive layer contains a thermoplastic elastomer.

4. The light-controlling film with an adhesive layer according to any one of claims 1 to 3, characterized in that a cut line is provided for cutting off at least a portion of the plastic film as the release film. A light-controlling film with an adhesive layer.

5. The light-controlling film with an adhesive layer according to any one of claims 1 to 3, characterized in that an embossed line is provided for cutting out at least a portion of the plastic film as the release film. A light-controlling film with an adhesive layer.

6. 6. The light control film with an adhesive layer according to claim 4 or 5, wherein the cut lines or embossed lines are straight or wavy.

7. 7. The light control film with an adhesive layer according to claim 4, wherein the cut lines or embossed lines are solid lines or broken lines.

8. A method for attaching a light control film with an adhesive layer to a glass surface, comprising: The light control film with a pressure-sensitive adhesive layer has a static friction coefficient between the plastic film serving as a release film and the glass surface of 0.8 or less, an edge pressure-sensitive adhesive layer exposing step of peeling off the plastic film as the release film of the pressure-sensitive adhesive layer-attached light control film at its edge to expose the pressure-sensitive adhesive layer at the edge; a positioning step of sliding the light control film with the pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer of which is exposed at the end by the edge pressure-sensitive adhesive layer exposing step, on a glass surface to position it; a temporary fixing step of temporarily fixing the pressure-sensitive adhesive layer-attached light control film positioned in the positioning step to a glass surface; and a bonding process in which the remaining plastic film as the release film is peeled off from the light control film with the pressure-sensitive adhesive layer temporarily fixed in the temporary fixing process, and the exposed pressure-sensitive adhesive layer is bonded to a glass surface. A method for attaching a light control film with an adhesive layer to a glass surface.

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