Adhesive layer-attached light control film and method for sticking the same on glass surface

Abstract

To provide a light control film capable of being slid without requiring application water with the light control film being temporarily bonded to a glass surface, thus facilitating alignment thereof, and in addition, capable of being brought into close contact with the glass surface with sufficient firmness.SOLUTION: An adhesive layer-attached light control film 100 is constituted of: a light control film 10 that is changed between a transparent state and an opaque state by presence / absence of application of a voltage; an adhesive layer 23 stacked on one surface of the light control film; and a mold release film 30 that is stuck on a surface of the adhesive layer so as to be easily peeled and protects the surface of the adhesive layer. A coefficient of static friction between the mold release film 30 and a glass surface is set to be 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 light control 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 a flexible transparent film 12a having a transparent electrode 12b laminated on one side thereof, and the transparent electrode 12b is laminated so as to face the liquid crystal layer 11. Similarly to the electrode film 12, the other electrode film 13 is a flexible transparent film 13a having a transparent electrode 13b laminated on one side thereof, and the transparent electrode 13b is laminated so as to face the liquid crystal layer 11. By applying a voltage to both of these electrodes 12b and 13b, the optical properties of the liquid crystal layer 11 change. For example, by applying a voltage, the liquid crystal layer becomes cloudy and opaque, blocking light rays, and on the other hand, by stopping the application of the voltage, the liquid crystal layer becomes transparent and transmits light rays. In addition, light-control films are also known in which, depending on the type of liquid crystal, the liquid crystal layer becomes transparent and transmits light when a voltage is applied, and becomes opaque and blocks light when the voltage application is stopped.

[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 entering through the windows.

[0004] When attaching 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 the obtained light control film with the adhesive layer is attached to the glass surface.

[0005] However, the acrylic adhesive has a strong adhesive force, and therefore, when the light-control film is bonded to the glass surface, air bubbles are easily trapped between the light-control film and the glass surface. When air bubbles are trapped, the surface of the light-control film becomes uneven, impairing its appearance, and impairing the function of the light-control film itself. In addition, when a part of the light-control film is bonded to the glass surface, it is impossible to adjust the position. On the other hand, in order to trap air or readjust the position, it is possible to peel off the light-control film that has been bonded once and then bond it again, but as mentioned above, the acrylic adhesive has a strong adhesive force, and therefore, it is difficult to peel off. In this way, when the light-control film is bonded to the glass surface using the acrylic adhesive, air bubbles are easily trapped, and it is difficult to peel off and re-attach it, so it was necessary to accurately align the film from the beginning and carefully bond it so as not to trap air bubbles.

[0006] For this reason, the following procedure was 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 coating of the application water on the surface.

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

[0009] Next, the light-control film with the acrylic adhesive layer exposed is temporarily fixed on the coating of the application water formed by spraying. Then, the light-control film is slid on the coating of the application water to align it. For example, if the glass is a window glass of a building, the light-control film is aligned to the frame. At this time, the coating of the application water is interposed between the acrylic adhesive layer and the glass surface and plays the role of a lubricant, so that the light-control film can be easily slid.

[0010] After this alignment, strong pressure is applied with a squeegee or the like to expel the application water and air between the acrylic adhesive layer and the glass surface, and the final adhesion is performed. Note that even at this time, the coating of the application water described above plays the role of a lubricant. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] JP 2019-45612 A Summary of the Invention [Problem to be solved by the invention]

[0012] However, this method requires spraying a large amount of application water onto the glass surface to form the above-mentioned coating of application water, which not only consumes a large amount of water, but also poses the problem that if the glass is a window glass in a house, the living environment may be exposed to water droplets, and it is necessary to evacuate and protect the living fixtures during the application work to prevent flooding of the living environment.

[0013] Furthermore, if air bubbles are trapped during the 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, the 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, The light control film with an adhesive layer is characterized in that the static friction coefficient between the release film and the glass surface is 0.8 or less.

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

[0017] A third aspect is a light control film with a pressure-sensitive adhesive layer, characterized in that in the light control film according to the first or second aspect, the release film has a thickness of 188 μm or less.

[0018] Further, 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 cut line is provided for cutting off at least a portion of the release film.

[0019] A fifth aspect is the light control film with a pressure-sensitive adhesive layer, characterized in that in the light control film according to the fourth aspect, the cut line penetrates the release film.

[0020] A sixth aspect is the light control film with a pressure-sensitive adhesive layer, characterized in that in the light control film according to the fourth aspect, the cut line reaches midway through the thickness direction of the release film.

[0021] Further, a seventh 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, an embossed line is provided for cutting out at least a portion of the release film.

[0022] Further, an 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] Further, a 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] A tenth aspect is a light control film with an adhesive layer, characterized in that in the light control film according to any one of the first to ninth aspects, the glass is a window glass of a building or a window glass of a moving object.

[0025] Further, the method for attaching the 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 pressure-sensitive adhesive layer-attached light control film has a static friction coefficient between the release film and a glass surface of 0.8 or less, an end adhesive layer exposing step of peeling off the release film of the adhesive layer-attached light control film at its end to expose the adhesive layer at the end; a positioning step of sliding the light control film with the adhesive layer in a state in which the adhesive layer at the end portion is exposed by the edge adhesive layer exposing step on a glass surface to position the light control film; 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; A bonding process is provided in which the remaining release film is peeled off from the light control film with the adhesive layer temporarily fixed in the temporary fixing process, and the exposed 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. Effect 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 description 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. [Diagram 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. [Diagram 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. [Diagram 5] FIG. 5 relates to a light control film with an 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 PREFERRED EMBODIMENTS

[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 the presence or absence of application of a voltage, and any known light control film can be used.

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

[0031] The release film also plays a role in protecting the surface of the adhesive layer until the adhesive layer is bonded to the glass surface. As described later, in the process of peeling off a part of the release film to expose the adhesive layer and sliding the adhesive layer-attached light control film to position it while keeping the part of the adhesive layer exposed, the release film also plays a role in protecting the adhesive layer other than the part exposed for temporary fixing and allowing it to slide easily and smoothly in contact with the glass surface.

[0032] Therefore, the following describes an embodiment of the present invention with reference to the attached 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 described 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 is a flexible transparent film 12a having a transparent electrode 12b laminated on one side thereof, and the transparent electrode 12b is laminated so as to face the liquid crystal layer 11. Similarly to the electrode film 12, the other electrode film 13 is a flexible transparent film 13a having a transparent electrode 13b laminated on one side thereof, and the transparent electrode 13b is laminated so as to face the liquid crystal layer 11. By applying a voltage to both of these electrodes 12b and 13b, the optical properties of the liquid crystal layer 11 change. For example, by applying a voltage, the liquid crystal layer becomes cloudy and opaque, blocking light rays, and on the other hand, by stopping the application of the voltage, the liquid crystal layer becomes transparent and transmits light rays. In addition, depending on the type of liquid crystal, the liquid crystal layer may become transparent and transmit 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 highly adhesive 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 having a relatively low adhesive strength.

[0037] Specifically, the adhesive strength must be in the range of 0.01 to 0.41 N / 25 mm when the adhesive layer 23 is attached to the glass surface and left for 30 minutes in an environment of 23°C and 55% RH. If the adhesive strength is higher than this, it becomes difficult to slide the light control film with the adhesive layer 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, and then temporarily fix it and slide it over this film to position it.

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

[0039] A film in which this thermoplastic elastomer is coated and laminated on one side of an adhesive film substrate is commercially available as an adhesive film, and the adhesive layer 22 can be provided on the adhesive film substrate side of this commercially available adhesive film to be used as the adhesive film 20. As a commercially available adhesive film, for example, Gelpoly by Panac Corporation can be used. This Gelpoly is an adhesive film substrate 21 made of polyester films of various thicknesses, and one side of the substrate is coated with a polyolefin-based thermoplastic elastomer to form an adhesive layer 23. However, even with this Gelpoly, the adhesion to the glass surface varies depending on the product, so it is necessary to use one having the adhesion in the range of 0.01 to 0.41 N / 25 mm from the products.

[0040] Since this gel poly has a protective release film attached to the surface of the adhesive layer 23, when applying this 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] The release film 30 can be constructed by laminating a release agent layer 32 on one side of a release film substrate 31, as shown in Fig. 3. 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 is to be in contact with the glass surface to which it is to be bonded. As described later, the release film 30 is peeled off at its end, and the release film 30 is left exposed at the end of the adhesive layer 23. The release film 30 is then slid on the glass surface to position the adhesive layer 23 on which the release film 30 is laminated. In this positioning step, the release film substrate 31 must be in contact with 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 bonded must be 0.8 or less. If the static friction coefficient exceeds 0.8, it is difficult to slide the release film substrate 31 in the positioning step. If it is difficult to slide the release film substrate 31 in this way, it is necessary to use a large amount of application water in the positioning step, as in the conventional case. 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 static friction coefficient 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., so it is desirable to select and use a film having a static friction coefficient with the glass surface of 0.8 or less from among commercially available films. If the thickness is too thick, it becomes difficult to attach or position the film on the glass surface, so it is desirable to have a thickness of 188 μm or less. An example of a commercially available film that can be used as the release film substrate 31 is Lumirror T60 by Toray Industries, Inc., which has a thickness of 30 to 188 μm.

[0044] Moreover, a silicone resin cured with various curing agents can be used as the release agent layer 32. For example, a platinum-based curing agent 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 the 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 a bonding 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, as shown in Fig. 5(a), it is desirable to provide a cut line 30x at the edge of the release film 30 to enable cutting. The cut line 30x can be provided using a blade such as a cutter or scissors, but an embossed line formed by embossing may be used instead of the cut line 30x.

[0048] In the illustrated example, the cut line 30x is linear and broken, and has a depth that penetrates the release film 30 and reaches the surface of the adhesive layer 23, but this is not limited thereto. 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 broken line. Also, the cut line 30x may reach the middle of the thickness direction of the release film 30 but not reach the surface of the adhesive layer 23. However, it is desirable that the release film 30 can be easily cut at this cut line 30x.

[0049] The cut line 30x may be provided at the construction site where the light control film 10 is attached to the glass surface, but is preferably provided at a manufacturing factory that manufactures the adhesive layer-attached light control film 100. If the cut line 30x is provided at the manufacturing factory in this way and the adhesive layer-attached light control film 100 with the cut line 30x is shipped, the work at the construction site becomes easier.

[0050] In this edge 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 adhesive layer 23a at the edge. Figure 5(b) shows this state.

[0051] Therefore, the next positioning step is a step of placing the adhesive layer-attached light control film 100 with the release film 30 laminated thereon on a glass surface with the end adhesive layer 23a exposed, and sliding it on the glass surface to position it. At this time, it is desirable that the exposed end adhesive layer 23a does not come into contact with the glass surface, but since the adhesive force 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 they come into contact. And since 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 the adhesive layer is adhered by the exposed edge adhesive layer 23a. As described above, since the adhesive strength between the adhesive layer 23 and the glass surface is relatively small, if a mistake is made, it is possible to peel it off and reattach it.

[0053] Finally, the lamination process is a process in which the remaining release film 30 is peeled off and removed from the adhesive layer-attached light control film 100 temporarily attached at the end, and the adhesive layer-attached light control film 100 is laminated to the glass surface by the exposed adhesive layer 23. Even though 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 adhesive layer-attached light control film 100 whose entire surface is thus laminated to the glass surface is sufficient and it will not peel off from the glass surface inadvertently.

[0054] Representative examples of glass to which the pressure-sensitive adhesive layer-attached light control film 100 is 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 used for fixtures and the like. EXAMPLES

[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 in a manufacturing factory; construction process B, in which the adhesive layer-equipped light-control film 100 is bonded to the surface of a window glass at an construction site; and result C, which explains the results.

[0057] Example 1 (A) A process for producing the light control film 100 with an adhesive layer Add 0.1 parts by weight of a platinum-based hardener (Shin-Etsu Chemical Co., Ltd.: PL-50T) to 100 parts by weight of an addition polymerization type silicone resin (Shin-Etsu Chemical Co., Ltd.: KS-841), and dilute it further with a mixed solvent of n-hexane and toluene to prepare a coating material for the release agent layer (Coating 31) with a solid content of 5% by weight. 1 ) was prepared.

[0058] A polyester film (Lumirror T60, manufactured by Toray Industries, Inc.) having a thickness of 38 μm was used as the release film substrate 31, and the coating material for the release agent layer 31 was applied to one side of the film. 1The resulting release agent layer 32 had a thickness of 100 nm.

[0059] Next, a gelboli manufactured by PANAC Corporation was prepared. This gelboli has a 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 above process was attached so that the release agent layer 31 faced the surface of the adhesive layer 23. In addition to this, an OCA (Optical Clear Adhesive) was bonded as an adhesive layer 22 to the surface of the adhesive film substrate 21 to produce an adhesive film 20 with the release film 30 attached. As the OCA, TD06A manufactured by Tomoegawa Paper Co., Ltd., in which a release film was attached to both sides of the OCA layer, was used, and one of the release films on both sides was peeled off and removed, and the exposed OCA layer was attached to the surface of the adhesive film substrate 21 to be attached.

[0061] A normal mode type light control film 10 (NW001, manufactured by Toppan Printing) was laminated to the adhesive layer 22 surface of the film obtained in the above process (adhesive film 20 laminated with release film 30) 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 adhered to the light control film 10 for lamination.

[0062] No cut lines 30x are provided in this adhesive layer-attached light control film 100. For this reason, as will be described next, cut lines 30x are provided in this adhesive layer-attached light control film 100 at the construction site.

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

[0064] The static friction coefficient between the release film 30 of the adhesive layer-attached light control film 100 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 adhesive layer-attached light control film 100 and the blue glass surface together.

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

[0066] Then, a cut line 30x was made in the release film 30 using a blade so as to form an isosceles right triangle with a side length of 0.5 m and the corner as a vertex. The cut line 30x was a straight, solid line, and had a depth that 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-adhesive-layer-attached light-control film 100 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 then 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 end adhesive layer 23a to the glass surface. Note that the adhesive layer-attached light control film 100 thus temporarily attached can be easily peeled off from its adhesive portion, and therefore the positioning and temporary attachment could be repeated many times.

[0070] Finally, the remaining release film 30 was peeled off and removed, while the exposed adhesive layer 23 was attached to the glass surface, and the entire adhesive layer-attached light control film 100 was attached to the glass surface. At this time, the adhesive layer-attached light control film 100 was attached from the temporarily attached end to the other end while automatically excluding air. Therefore, no air bubbles remained between the attached 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 can be attached to the glass surface of the daylight window without using application water, and that the positioning and temporary fixing can be repeated many times. In addition, a part of the adhesive layer 23 can be exposed, and the film can be aligned and attached using the end adhesive layer 23a. In addition, in the bonding process in which the entire light control film 100 with the adhesive layer is bonded, the bonding process proceeds while automatically removing air, so there is no need to apply strong pressure in any of the positioning process, temporary fixing process, and bonding process. Therefore, each of these processes can be easily performed, and the light control film 10 is not damaged.

[0072] Example 2 (A) A process for producing the light control film 100 with an 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.) having a thickness of 125 μm was used as the release film substrate 31 .

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

[0074] 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 0.60.

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

[0076] (C) Result As in Example 1, the film 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 steps, so each step could be easily performed without damaging the light control film 10.

[0077] Example 3 (A) A process for producing the light control film 100 with an 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.) having 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 thus obtained pressure-sensitive adhesive layer-attached light control film 100 and the blue glass surface was 0.01 N / 25 mm.

[0079] 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 0.35.

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

[0081] (C) Result As in Example 1, the film 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 steps, so each step could be easily performed without damaging the light control film 10.

[0082] Example 4 (A) A process for producing the light control film 100 with an adhesive layer The light control film 100 with the adhesive layer was manufactured in the same manner as in Example 1. However, in this example, the cut line 30x was formed in the manufacturing factory. The cut line 30x was formed using a blade in the same manner as in Example 1 so as to form a right-angled isosceles triangle with a side length of 0.5 m, with the corner of the light control film 100 with the adhesive layer as the apex, and was a straight, solid line with a depth that penetrated the release film 30 and reached the surface of the adhesive layer 23.

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

[0084] 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 0.52.

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

[0086] (C) Result As in Example 1, the film 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 steps, so each step could be easily performed without damaging the light control film 10.

[0087] In this example, the process of forming the cut lines 30x was carried out at the manufacturing plant, so there was no need for blades such as cutters or scissors at the construction site, proving to be extremely convenient.

[0088] Example 5 (A) A process for producing the light control film 100 with an adhesive layer A light control film 100 with an adhesive layer was manufactured in the same manner as in Example 1. However, in this example, the cut line 30x was formed in a manufacturing factory. The cut line 30x was formed using a blade to form a right-angled isosceles triangle with a side length of 0.5 m, with the corner of the light control film 100 with an adhesive layer as the apex, as in Example 1. The cut line 30x was linear and solid as in Example 1, but the depth was a depth that did not penetrate the release film 30 but reached the middle of its thickness direction, 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 thus obtained pressure-sensitive adhesive layer-attached light control film 100 and the blue glass surface was 0.21 N / 25 mm.

[0090] 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 0.45.

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

[0092] (C) Result As in Example 1, the film 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 steps, so each step could be easily performed without damaging the light control film 10.

[0093] In this example, the process of forming the cut lines 30x was carried out at the manufacturing plant, so there was no need for blades such as cutters or scissors at the construction site, proving to be extremely convenient.

[0094] Example 6 (A) A process for producing the light control film 100 with an adhesive layer A light control film 100 with an adhesive layer was manufactured in the same manner as in Example 1. However, in this example, the cut line 30x was formed in a manufacturing factory. The cut line 30x was formed using a blade to form a right-angled isosceles triangle with a side length of 0.5 m, with the corner of the light control film 100 with an adhesive layer as the apex, as in Example 1. The cut line 30x was linear as in Example 1, but perforated. The depth was a depth that did not penetrate the release film 30 but reached the middle of its thickness direction, 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 thus obtained pressure-sensitive adhesive layer-attached light control film 100 and the blue glass surface was 0.41 N / 25 mm.

[0096] 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 0.45.

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

[0098] (C) Result As in Example 1, the film 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 steps, so each step could be easily performed without damaging the light control film 10.

[0099] In this example, the process of forming the cut lines 30x was carried out at the manufacturing plant, so there was no need for blades such as cutters or scissors at the construction site, proving to be extremely convenient.

[0100] Example 7 (A) A process for producing the light control film 100 with an adhesive layer A light control film 100 with an adhesive layer was manufactured in the same manner as in Example 1. However, in this example, embossed lines were formed in the manufacturing plant instead of the cut lines 30x. The embossed lines were formed in a straight and solid shape using a metal embossing roll. And, 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 each, with the corners of the light control film 100 with an adhesive layer as vertices. Also, 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 thus obtained pressure-sensitive adhesive layer-attached light control film 100 and the blue glass surface was 0.29 N / 25 mm.

[0102] 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 0.50.

[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. In the (B2) edge pressure-sensitive adhesive layer 23a exposure step, the release film 30 in the shape of a right-angled isosceles triangle located on the corner side of the embossed lines 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 a skylight window in the same manner as in Example 1.

[0105] (C) Result As in Example 1, the film 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 steps, so each step could be easily performed without damaging the light control film 10.

[0106] In this example, the process of forming the cut lines 30x was carried out at the manufacturing plant, so there was no need for blades such as cutters or scissors at the construction site, proving to be extremely convenient.

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

[0108] (A) A process for producing the light control film 100 with an 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 thus obtained pressure-sensitive adhesive layer-attached light control film 100 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 cut it to the specified size in advance rather than cutting it at the construction site.

[0112] In addition, an attempt was made to peel off the entire release film 30 to expose the entire adhesive layer 23 and then to bond the pieces together while adjusting their position; however, the adhesive layer 23 adhered to the glass surface could not be moved, and it became necessary to take great care in the positioning process.

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

[0114] (C) Result In Example 8, a light control film having 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 was confirmed, although slight. However, after construction, a light control glass window that was practically usable was provided, as in 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) A process for producing the light control film 100 with an adhesive layer 50 parts by weight of addition polymerization type silicone resin (DuPont Toray Specialty Materials Co., Ltd.: LTC-750A) was mixed with 50 parts by weight of release agent (DuPont Toray Specialty Materials Co., Ltd.: SD7292) and 0.1 parts by weight of platinum-based hardener (Shin-Etsu Chemical Co., Ltd.: SRX-212), and the mixture was diluted with a mixed solvent of n-hexane and toluene to prepare a release agent layer paint (paint 31) with a solid content of 2% by weight. 2 ) was prepared.

[0117] A polyethylene film having a thickness of 100 μm was used as the release film substrate 31, and one side of the film was subjected to a corona discharge treatment, after which the coating material for the release agent layer 31 was applied to the treated surface. 2 was applied, dried at 40° C., and cured by irradiating with ultraviolet light using an ultraviolet irradiator (Fusion H bulb), to produce a release film 30. The resulting release agent layer 32 had a thickness of 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 thus obtained pressure-sensitive adhesive layer-attached light control film 100 and the blue glass surface was 0.19 N / 25 mm.

[0120] 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 0.85.

[0121] (B) Construction process First, a cut line 30x was provided at the corner of the adhesive layer-attached light control film 100 in the same manner as in Example 1. The cut line 30x was formed using a blade in the same manner as in Example 1 so as to form a right-angled isosceles triangle with a side length of 0.5 m, with the corner of the adhesive layer-attached light control film 100 as the apex, and was a straight, solid line with a depth that penetrated the release film 30 and reached the surface of the 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 adhesive layer-attached light control film 100 with the end adhesive layer 23a exposed in this manner was placed on the glass surface of the light-receiving window so that the 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 in the same manner as in Example 1. However, the release film 30 did not slide well against 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 attempt to bond the pieces together while adjusting their position, but we were unable to move the adhesive layer 23 adhered to the glass surface, and therefore were unable to position it properly.

[0125] For this reason, the positioning and lamination were carried out using 1 liter of application 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 daylight window without using application water. Therefore, the positioning process, temporary fixing process, and attachment process were not easy. In addition, it was necessary to apply strong pressure to remove air bubbles, and damage to the light control film 10, although slight, 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) A process for producing the light control film 100 with an adhesive layer A 50 μm thick non-oriented polypropylene film (Pylane CT P1146, manufactured by Toyobo Co., Ltd.) was used as the release film substrate 31. One side of the film was subjected to a corona discharge treatment, and the release agent layer coating material 31 used in Comparative Example 1 was applied to the treated side. 2 The resulting layer was dried at 40° C. and then irradiated with ultraviolet light using an ultraviolet irradiator (Fusion H bulb) to harden the layer, producing 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 thus obtained pressure-sensitive adhesive layer-attached light control film 100 and the blue glass surface was 0.21 N / 25 mm.

[0130] 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 0.90.

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

[0132] Then, similarly to Example 1, this light control film 100 with an adhesive layer was placed on the glass surface of a light-receiving window, and an attempt was made to slide it on 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, the release film 30 was entirely peeled off to expose the entire adhesive layer 23, and an attempt was made to bond the film while adjusting the position, but the adhesive layer 23 attached to the glass surface could not be moved, and positioning was not possible.

[0133] For this reason, the positioning and lamination were carried out using 1 liter of application 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 attach the film to the glass surface of the light-receiving window without using application water. Therefore, the positioning process, the temporary fixing process, and the attachment process were not easy, and since it was necessary to apply strong pressure to remove air bubbles, damage to the light control film 10, although slight, 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) A process for producing the light control film 100 with an 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 release agent layer coating material 31 used in Example 1 was applied to the polyester film surface. 1Then, the release agent was applied onto the release film 30 and dried and cured at 120° C. to produce the release film 30. The thickness of the obtained release agent layer 32 was 100 nm. The reason why a film having an acrylic hard coat layer was used as the release film substrate 31 was to prevent the release film 30 from being scratched during transportation from the manufacturing factory to the construction site.

[0137] In other respects, similarly to Example 1, a pressure-sensitive adhesive layer-attached light control film 100 was produced.

[0138] As in Example 1, the post-storage adhesion between the pressure-sensitive adhesive layer 23 of the thus obtained pressure-sensitive adhesive layer-attached light control film 100 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 provided at the corner of the adhesive layer-attached light-control film 100, and the release film 30 was removed to expose an end adhesive layer 23a in the shape of a right-angled isosceles triangle with sides of 0.5 m and with the corner of the adhesive layer-attached light-control film 100 as a vertex.

[0141] Then, similarly to Example 1, this light control film 100 with an adhesive layer was placed on the glass surface of a light-receiving window, and an attempt was made to slide it on 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, the release film 30 was entirely peeled off to expose the entire adhesive layer 23, and an attempt was made to bond the film while adjusting the position, but the adhesive layer 23 attached to the glass surface could not be moved, and positioning was not possible.

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

[0143] (C) Result In this example, the results were similar to those of Comparative Example 1 and Comparative Example 2. That is, it was not possible to attach the film to the glass surface of the light-receiving window without using application water. For this reason, the positioning process, the temporary fixing process, and the attachment process were not easy, and since it was necessary to apply strong pressure to remove air bubbles, damage to the light control film 10, although slight, was confirmed.

[0144] For this reason, it was found that the static friction coefficient 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 high adhesive strength to the glass surface.

[0146] (A) A process for producing the light control film 100 with an 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) and silane coupling agent ( 0.5 parts by weight of S-1 (manufactured by Saiden Chemical Co., Ltd.) was added, and further ethyl acetate was added as a solvent to dilute the mixture, to give a coating material for the adhesive layer (Coating 23) with a solid content of 30% by weight. 1 ) was prepared.

[0148] Using a comma coater, apply 23 1 The resultant was coated onto a 38 μm-thick light release film (E7002, manufactured by Toyobo Co., Ltd.), dried at 100° C. for 2 minutes, and further aged at 40° C. for 48 hours to form an 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. Note that this adhesive layer-attached light control film 100 is a film in which an adhesive layer 23 and a release film 30 are laminated in this order on one surface of the light control film 100.

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

[0152] 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 0.45.

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

[0154] Then, similarly to 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 the adhesive layer-attached light control film 100 thus positioned was temporarily attached to the glass surface by the end adhesive layer 23a, a part of the end adhesive layer 23a was strongly attached to the glass surface, and air bubbles were generated between the end adhesive layer 23a and the glass surface. Therefore, it was impossible to align the end adhesive layer 23a and attach it to the glass surface. Therefore, using 1 liter of application water and an application squeegee, the end 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, while peeling off the remaining release film 30, the exposed adhesive layer 23 was adhered to the glass surface, and the entire adhesive layer-attached light control film 100 was attached to the glass surface. Note that, again, 2 liters of application water and strong pressure from the application squeegee were required.

[0157] (C) Result In this example, too, it was not possible to attach the film to the glass surface of the daylight window without using application water. Therefore, the positioning process, temporary fixing process, and attachment 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 high adhesive strength to the glass surface.

[0159] (A) A process for producing the light control film 100 with an adhesive layer To 100 parts by weight of acrylic adhesive paint (Saiden Chemical Co., Ltd.: OC3949), 0.5 parts by weight of hardener (Saiden Chemical Co., Ltd.: K130), 0.5 parts by weight of silane coupling agent (Saiden Chemical Co., Ltd.: S-1), and 100 parts by weight of UV absorber (BASF Japan Ltd.: TINUVIN109) were added, and the mixture was further diluted with ethyl acetate as a solvent to obtain a paint for adhesive layer (paint 23) with a solid content of 30% by weight. 2 ) was prepared.

[0160] This adhesive layer paint 23 2 Adhesive layer paint 23 1 A light control film 100 with a pressure-sensitive adhesive layer was produced in the same manner as in Example 9, except that the above-mentioned was used instead of the above.

[0161] Then, similarly to Example 1, the adhesion 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 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 case where this light control film 100 with an adhesive layer was attached to the glass surface of a light-collecting window was also the same as in Example 9. That is, when the positioned light control film 100 with an adhesive layer was temporarily attached to the glass surface with its end adhesive layer 23a, a part of the end adhesive layer 23a was strongly adhered to the glass surface, and air bubbles were also generated between the end adhesive layer 23a and the glass surface. Therefore, in order to temporarily attach the end adhesive layer 23a to the glass surface, 1 liter of application water and strong pressure by the application squeegee were required. In addition, when peeling off and removing the remaining release film 30 and attaching the entire light control film 100 with an adhesive layer, 2 liters of application water and strong pressure by the application squeegee were required.

[0164] (C) Result In this example, too, it was not possible to attach the film to the glass surface of the daylight window without using application water. Therefore, the positioning process, temporary fixing process, and attachment 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) A process for producing the light control film 100 with an adhesive layer As the paint for the release agent layer, the paint 31 used in Example 1 was used. 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 obtain a coating material 31 for a release agent layer having a solid content of 5% by weight. 1 was prepared.

[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 31 was applied to one side of the film. 1 The resulting release agent layer 32 had a thickness of 100 nm.

[0168] Next, the paint 23 used in Example 9 was used as the paint for the adhesive layer. 1 That is, 0.5 parts by weight of a hardener (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 diluted with ethyl acetate as a solvent to obtain an adhesive layer paint 23 having a solid content of 30% by weight. 1 was prepared.

[0169] And, this adhesive layer paint 23 1 The resultant was applied onto a 38 μm-thick light release film (E7002, manufactured by Toyobo Co., Ltd.) 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 is a film in which an adhesive layer 23 and a release film 30 are laminated in this order on one surface of the light control film 100.

[0172] Then, similarly to Example 1, the adhesion 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 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 tried to provide 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 could not be cut 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 attach it to the glass surface. The reason why such a large amount of application water is required is because the positioning and air bubbles were simultaneously performed in parallel to apply strong adhesive to a large area in one go.

[0176] (C) Result In this example, it was not possible to apply the film to the glass surface of the daylight window without using application water. Moreover, since the positioning and application had to be done simultaneously, and strong adhesion had to be applied to a large area at once, the application took a long time and was extremely difficult. In addition, the damage to the light control film 10 was also 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) A process for producing the light control film 100 with an adhesive layer The release film 30 used was the same as the release film in 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 obtain a coating material 31 for a release agent layer having a solid content of 5% by weight. 1A polyester film having a thickness of 250 μm (Toray Industries, Inc.: Lumirror T60) was used as the release film substrate 31, and a coating material for a release agent layer 31 was applied to one side of the polyester film. 1 A release film 30 was produced by coating the film with

[0179] In addition, the paint 23 used in Example 10 was used as the paint for the adhesive layer. 2 That is, 0.5 parts by weight of a hardener (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 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 obtain a paint for adhesive layer (paint 23) with a solid content of 30% by weight. 2 ) was prepared.

[0180] And, this adhesive layer paint 23 1 The resultant was applied onto a 38 μm-thick light release film (E7002, manufactured by Toyobo Co., Ltd.) 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 is a film in which an adhesive layer 23 and a release film 30 are laminated in this order on one surface of the light control film 100.

[0182] Then, similarly to Example 1, the adhesion 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 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 pressure-sensitive adhesive layer-attached light control film 100 and the blue glass surface was 0.43.

[0184] (B) Construction process As in Example 1, we first tried to provide 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 could not be cut 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 attach it to the glass surface. The reason why such a large amount of application water is required is because the positioning and air bubbles were simultaneously performed in parallel to apply strong adhesive to a large area in one go.

[0186] (C) Result In this example, the results were the same as those of Example 11. That is, it was not possible to attach the film to the glass surface of the daylight window without using application water. Moreover, since the positioning and attachment were performed simultaneously, and a strong adhesive was applied to a large area at once, the application took a long time and was extremely difficult. In addition, the damage to the light control film 10 was also significant.

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

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

[0189] 100: Light control 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 material 22: Adhesive layer 23: Adhesive layer 23: Edge adhesive layer 30: Release film 31: Release film base material 32: Release agent layer 30x: Cutting line

Claims

1. A light-control film that changes between transparent and opaque states 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 control film with an adhesive layer, characterized in that the static friction coefficient between 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 adhesive layer contains a thermoplastic elastomer.

3. 3. The light control film with an adhesive layer according to claim 1, wherein the release film has a thickness of 188 μm or less.

4. The light control film with an adhesive layer according to any one of claims 1 to 3, further comprising a cut line for cutting off at least a partial area of ​​the release film.

5. 5. The light control film with an adhesive layer according to claim 4, wherein the cut line penetrates the release film.

6. 5. The light control film with an adhesive layer according to claim 4, wherein the cut line reaches the middle of the release film in the thickness direction.

7. The light control film with an adhesive layer according to any one of claims 1 to 3, further comprising an embossed line for cutting off at least a partial area of ​​the release film.

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

9. 9. The light control film with an adhesive layer according to claim 4, wherein the cut line or embossed line is a solid line or a broken line.

10. 10. The light control film with an adhesive layer according to claim 1, wherein the glass is a window glass of a building or a window glass of a moving object.

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

Images