JP7800745B2 - Light-controlling film with adhesive layer and method for attaching light-controlling film with adhesive layer to glass surface - Google Patents

Description

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

Light-controlling films are capable of adjusting and controlling the transmission and blocking of light. Such light-controlling 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 Figure 1. As shown, the electrode film 12 is made 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 made 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 causes the liquid crystal layer to become opaque and block light; on the other hand, removing the voltage causes the liquid crystal layer to become transparent and transmit light. Additionally, 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.

Such light-control films are used for a variety of purposes, but a typical use is to attach them to the surface of building window glass or automobile window glass to adjust or control the amount of sunlight that enters through these windows.

When bonding a light control film to a glass surface in this way, it has traditionally been the case to use an acrylic adhesive (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.

However, acrylic adhesives have strong adhesive properties, which means that air bubbles can easily become trapped between the light control film and the glass surface during application. These trapped air bubbles not only create unevenness on the surface of the light control film, marring its appearance, but also impairing the functionality of the light control film itself. Furthermore, once a portion of the light control film has been 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 in order to trap air or readjust its position, as mentioned above, acrylic adhesives have strong adhesive properties, making this removal difficult. Thus, when using acrylic adhesives to adhere light control film to a glass surface, air bubbles can easily become trapped, and peeling and re-application are difficult. Therefore, it is necessary to precisely align the film from the beginning and carefully apply it to avoid trapping air bubbles.

For this reason, the pieces were glued together using the following procedure.

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.

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

Next, the light control film with the exposed acrylic adhesive layer is temporarily attached to the aforementioned coating of 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 pane in a building, the light control film is aligned with the frame. At this time, the coating of application water acts as a lubricant between the acrylic adhesive layer and the glass surface, making it easy to slide the light control film.

After aligning them in this way, strong pressure is applied using a squeegee or similar to expel any application water and air trapped between the acrylic adhesive layer and the glass surface, completing the bond. Note that even at this time, the film of application water mentioned above acts as a lubricant.

Japanese Patent Application Laid-Open No. 2019-45612

However, with this method, it was necessary to spray large amounts of application water onto the glass surface to form the aforementioned coating of application water. This not only had the drawback of consuming large amounts of water, but also, if the glass was a residential window, there was a risk of exposing the living environment to water droplets, which created the problem of having to evacuate fixtures and fittings and take measures to prevent flooding of the living environment during application work.

Furthermore, if air bubbles were trapped during the temporary joining, it was necessary to apply extremely strong pressure using a squeegee or similar tool to remove the air bubbles.

The present invention therefore aims to provide a light-control film with an adhesive layer that can be easily applied to glass surfaces.

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 light control film with a pressure-sensitive adhesive layer is adhered to a glass surface of a windowpane of a building or a mobile body by the pressure-sensitive adhesive layer from which the release film has been peeled off,
The light control film with a pressure-sensitive adhesive layer is characterized in that the coefficient of static friction between the release film and the glass surface is 0.8 or less.

The second aspect is a light control film with an adhesive layer, characterized in that, in the light control film described in the first aspect, the adhesive layer contains a thermoplastic elastomer.

The third aspect is a light control film with a pressure-sensitive adhesive layer, characterized in that, in the light control film described in the first or second aspect, the thickness of the release film is 188 μm or less.

The fourth aspect is a light control film with an adhesive layer, which is the light control film described in any one of the first to third aspects, and is characterized by having a cutting line for cutting off at least a partial area of the release film.

The fifth aspect is a light control film with an adhesive layer, characterized in that, in the light control film described in the fourth aspect, the cutting line penetrates the release film.

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 partway through the thickness direction of the release film.

The seventh aspect is a light control film with an adhesive layer, characterized in that the light control film described in any one of the first to third aspects is provided with embossed lines for cutting out at least a partial area of the release film.

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

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.

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 release film and the glass surface of 0.8 or less,
an edge pressure-sensitive adhesive layer exposing step of peeling off the release film at the edge of the pressure-sensitive adhesive layer-attached light control film 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 step of peeling off the remaining release film from the pressure-sensitive adhesive layer-attached light control film temporarily attached in the temporary fixing step, and bonding the exposed pressure-sensitive adhesive layer to a glass surface.
This is a method for attaching a light control film with an adhesive layer to a glass surface.

The present invention provides a light-control film with an adhesive layer that can be easily applied to glass surfaces.

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. 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. FIG. 3 is an explanatory cross-sectional view of a release film constituting a light control film with a pressure-sensitive adhesive layer according to an embodiment of the present invention. 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. 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.

The light control film with an adhesive layer of the present invention has three essential components: a light control film, an adhesive layer, and a release film.

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

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 laminated to the light-control film.

The release film also serves to protect the surface of the adhesive layer until it adheres to the glass surface via the adhesive layer. As described below, in the process of peeling and removing a portion of the release film to expose the adhesive layer, and then sliding and positioning the light control film with the adhesive layer still partially exposed, the release film protects the adhesive layer except for the portion exposed for temporary attachment, and also serves to allow it to slide easily and smoothly in contact with the glass surface.

Embodiments of the present invention will now be described with reference to the accompanying drawings. Figure 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, Figure 2 is an explanatory cross-sectional view of an adhesive film 20, and Figure 3 is an explanatory cross-sectional view of a release film 30. Also, Figure 4(a) is an explanatory cross-sectional view of a light control film 100 with an adhesive layer, and Figure 4(b) is an explanatory perspective view thereof.

As mentioned above, the light control film 10 may be a known light control film (see Figure 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 made 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 made 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 causes the liquid crystal layer to become opaque and block light, whereas removing the voltage causes the liquid crystal layer to become transparent and transmit light. Additionally, depending on the type of liquid crystal, the light-control film may be one in which 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.

Next, the adhesive film 20 is formed by laminating an adhesive layer 22 on one side of an adhesive film substrate 21 and coating and laminating a pressure-sensitive adhesive layer 23 on the other side.

The adhesive layer 22 is used to attach the pressure-sensitive adhesive film 20 to the light-control film 10, and can be made of a highly adhesive adhesive such as a urethane adhesive or an acrylic adhesive.

On the other hand, the adhesive layer 23 is used to adhere the adhesive film 20 to the glass surface, and it is necessary to use an adhesive with relatively low adhesion.

Specifically, when the adhesive layer 23 is adhered to the 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 light control film with the adhesive layer for positioning while leaving part of the adhesive layer exposed. For this reason, in this case, as with conventional methods, 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 it and slide it over this film to position it.

The adhesive used in this adhesive layer 23 can be, for example, a thermoplastic elastomer. For example, a polyolefin-based thermoplastic elastomer.

A film in which this thermoplastic elastomer is coated and laminated onto one side of an adhesive film substrate is commercially available as an adhesive film, so 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 from Panac Corporation. This Gelpoly uses polyester films of various thicknesses as the adhesive film substrate 21, and a polyolefin-based thermoplastic elastomer is coated on one side to form the 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.

This gel poly has a protective release film attached to the surface of its adhesive layer 23. When applying this to the present invention, the protective release film must be removed and a release film 30, described below, must be attached instead.

As shown in Figure 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 mentioned 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 adhered to the glass surface. For this reason, the release agent layer 32 is laminated on the surface facing the adhesive layer 23.

On the other hand, the release film substrate 31 abuts against the glass surface to which it is to be attached. As described below, this adhesive-layered 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-layered 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 abut against 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, it is necessary to use a large amount of application water in the positioning process, as in the conventional method. Preferably, the static friction coefficient is 0.8 or less.

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, type, and amount of additives contained in the polyester film, the presence and type of surface treatment, and the lot. Therefore, it is desirable to select and use a commercially available film whose static friction coefficient with the glass surface is 0.8 or less. However, if the film is too thick, it will be difficult to attach and 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.

The release agent layer 32 can be made from silicone resin cured with various curing agents. For example, a platinum-based curing agent can be used as the curing agent.

Next, we will explain how to attach this adhesive layer-attached light control film 100 to a glass surface. Figures 5(a) and 5(b) are both perspective views for explaining how to attach it to a glass surface.

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

The edge adhesive layer exposing process is a process in which the release film 30 of the adhesive layer-attached light control film 100 is peeled off at its edge to expose the adhesive layer at the edge. For this process, as shown in Figure 5(a), it is desirable to provide a cut line 30x at the edge of the release film 30 so that it can be cut. 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.

In the illustrated example, the cut line 30x is straight and dashed, and has a depth that penetrates the release film 30 and reaches the surface of the 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. It may also be a solid line instead of a dashed line. The cut line 30x may also reach partway through the thickness 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 along this cut line 30x.

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

In this edge adhesive layer exposing process, 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 adhesive layer 23a. Figure 5(b) shows this state.

The next step, the positioning step, involves placing the adhesive layer-attached light control film 100, with the release film 30 laminated thereon and the edge adhesive layer 23a exposed, on a glass surface and sliding it across the glass surface to position it. At this point, it is desirable that the exposed edge adhesive layer 23a does not come into contact with the glass surface; however, because the adhesion between the adhesive layer 23 and the glass surface is relatively weak, 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.

Next, in the temporary fixing process, the positioned light control film 100 with an adhesive layer is adhered using the exposed edge adhesive layer 23a. As mentioned above, the adhesive strength between the adhesive layer 23 and the glass surface is relatively weak, so if a mistake is made, it can be peeled off and re-applied.

Finally, the lamination process involves peeling and removing the remaining release film 30 from the adhesive layer-attached light control film 100 that has been temporarily attached at the edges, and laminating the adhesive layer-attached light control film 100 to the glass surface using the exposed adhesive layer 23. Although the adhesion between the adhesive layer 23 and the glass surface is relatively weak, 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. Therefore, 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 inadvertently from the glass surface.

Typical examples of glass to which this 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, this is not limited to these, and it can also be used for fixtures, etc.

The present invention will be explained below using examples and comparative examples.

These examples and comparative examples will be explained separately: 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 Results C, which explains the results.

Example 1
(A) Step of producing a light control film 100 with a pressure-sensitive adhesive layer To 100 parts by weight of an addition polymerization type silicone resin (KS-841 manufactured by Shin-Etsu Chemical Co., Ltd.), 0.1 parts by weight of a platinum-based curing agent (PL-50T manufactured by Shin-Etsu Chemical Co., Ltd.) 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 31 ₁ ) with a solid content of 5% by weight.

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 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.

Next, we prepared Gelboli manufactured by Panac Corporation. This Gelboli consists of a polyester film of various thicknesses as the adhesive film substrate 21, with a polyolefin-based thermoplastic elastomer applied to one side to form the adhesive layer 23. A protective release film is attached to the surface of this adhesive layer 23.

The protective release film was then peeled off, and in its place the release film 30 produced in the previous step was adhered so that the release agent layer 31 faced the surface of the adhesive layer 23. Additionally, an OCA (Optical Clear Adhesive) was bonded to the surface of the adhesive film substrate 21 as the adhesive layer 22 to produce an adhesive film 20 with the release film 30 adhered to it. For the OCA, TD06A manufactured by Tomoegawa Paper Co., Ltd., with release films adhered to both sides of the OCA layer, was used. One of the release films on both sides was peeled off and removed, and the exposed OCA layer was adhered to the surface of the adhesive film substrate 21, resulting in adhesion.

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 with release film 30 laminated thereto), producing 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.

This adhesive layer-attached light control film 100 does not have a cut line 30x. Therefore, as explained below, cut lines 30x are provided on this adhesive layer-attached light control film 100 at the installation site.

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

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.

(B) Installation process The size of the light-receiving window to which the adhesive layer-attached light-control film 100 was 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 corresponding to this window size.

A cutting line 30x was then made in the release film 30 using a blade to form a right-angled isosceles triangle with a side length of 0.5 m and with the corner as the vertex. The cutting 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.

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 adhesive layer 23 at this position.

The light control film 100 with the adhesive layer, with the edge adhesive layer 23a exposed, 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 then slid over the glass surface to position it.

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

Finally, the remaining release film 30 was peeled off and removed, while the exposed adhesive layer 23 was adhered to the glass surface, and the entire adhesive-layered light control film 100 was bonded to the glass surface. During this process, the adhesive-layered light control film 100 was bonded from the temporarily attached end to the other end, automatically eliminating air. As a result, no air bubbles remained between the bonded adhesive-layered light control film 100 and the glass surface.

(C) Results 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, or lamination processes. Therefore, each of these processes could be easily carried out without damaging the light-control film 10.

Example 2
(A) Process for 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 with a thickness of 125 μm (Lumirror T60 manufactured by Toray Industries, Inc.) was used as the release film substrate 31.

As in Example 1, the post-storage adhesion strength between the adhesive layer 23 of the resulting adhesive layer-attached light control film 100 and the blue glass surface was 0.34 N/25 mm.

In addition, the static friction coefficient between the release film 30 of the light control film 100 with an adhesive layer and the blue glass surface was 0.60.

(B) Application Step As in Example 1, the film was attached to the glass surface of the light-receiving window.

(C) Results 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.

Example 3
(A) Process for 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 with a thickness of 188 μm (Lumirror T60, manufactured by Toray Industries, Inc.) was used as the release film substrate 31.

As in Example 1, the post-storage adhesion strength between the adhesive layer 23 of the resulting adhesive layer-attached light control film 100 and the blue glass surface was 0.01 N/25 mm.

In addition, 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.

(B) Application Step As in Example 1, the film was attached to the glass surface of the light-receiving window.

(C) Results 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.

Example 4
(A) Process for manufacturing the light control film 100 with an adhesive layer The 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 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 an adhesive layer, and was a straight, solid line with a depth that penetrated the release film 30 and reached the surface of the adhesive layer 23.

As in Example 1, the post-storage adhesion strength between the adhesive layer 23 of the resulting adhesive layer-attached light control film 100 and the blue glass surface was 0.29 N/25 mm.

In addition, the static friction coefficient between the release film 30 of the light control film 100 with an adhesive layer and the blue glass surface was 0.52.

(B) Application 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 process of forming the cut lines 30x was carried out in the manufacturing factory.

(C) Results 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.

In this example, the process of forming the cut lines 30x was carried out at the manufacturing factory, so there was no need for blades such as cutters or scissors at the construction site, demonstrating the great convenience of this method.

Example 5
(A) Process for manufacturing the light control film 100 with a pressure-sensitive adhesive layer The 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. Furthermore, as in Example 1, the cut line 30x was straight and solid, but its depth did not penetrate the release film 30 but reached partway through its thickness, and varied in the range of 3 to 30 μm.

As in Example 1, the post-storage adhesion strength between the adhesive layer 23 of the resulting adhesive layer-attached light control film 100 and the blue glass surface was 0.21 N/25 mm.

In addition, the static friction coefficient between the release film 30 of the light control film 100 with an adhesive layer and the blue glass surface was 0.45.

(B) Application 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 process of forming the cut lines 30x was carried out in the manufacturing factory.

(C) Results 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.

In this example, the process of forming the cut lines 30x was carried out at the manufacturing factory, so there was no need for blades such as cutters or scissors at the construction site, demonstrating the great convenience of this method.

Example 6
(A) Process for manufacturing the light control film 100 with a pressure-sensitive adhesive layer The 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 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 linear, but perforated, as in Example 1. The depth of the cut lines was measured so as to reach partway through the thickness of the release film 30 without penetrating it, and varied from 3 to 30 μm.

As in Example 1, the post-storage adhesion strength between the adhesive layer 23 of the resulting adhesive layer-attached light control film 100 and the blue glass surface was 0.41 N/25 mm.

In addition, the static friction coefficient between the release film 30 of the light control film 100 with an adhesive layer and the blue glass surface was 0.45.

(B) Application 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 process of forming the cut lines 30x was carried out in the manufacturing factory.

(C) Results 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.

In this example, the process of forming the cut lines 30x was carried out at the manufacturing factory, so there was no need for blades such as cutters or scissors at the construction site, demonstrating the great convenience of this method.

Example 7
(A) Process for manufacturing the light control film 100 with a pressure-sensitive adhesive layer The 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 at the manufacturing factory instead of the cut lines 30x. 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.

As in Example 1, the post-storage adhesion strength between the adhesive layer 23 of the resulting adhesive layer-attached light control film 100 and the blue glass surface was 0.29 N/25 mm.

In addition, the static friction coefficient between the release film 30 of the light control film 100 with an adhesive layer and the blue glass surface was 0.50.

(B) Application Step As mentioned above, the embossed lines were formed at the manufacturing factory, so no cut lines were formed at the application site. Then, in (B2) the 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.

Apart from the above, it was attached to the glass surface of the skylight in the same manner as in Example 1.

(C) Results 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.

In this example, the process of forming the cut lines 30x was carried out at the manufacturing factory, so there was no need for blades such as cutters or scissors at the construction site, demonstrating great convenience.

(Example 8)
In this example, a thick film is used as the release film substrate 31 .

(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, the light control film 100 with a pressure-sensitive adhesive layer was produced in the same manner as in Example 1.

As in Example 1, the post-storage adhesion between the adhesive layer 23 of the resulting adhesive layer-attached light control film 100 and the blue glass surface was 0.35 N/25 mm.

In addition, the static friction coefficient between the release film 30 of the light control film 100 with an adhesive layer and the blue glass surface was 1.50.

(B) Construction process As in Example 1, we first tried 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.

We also tried peeling off the entire release film 30 to expose the entire adhesive layer 23 and then adjusting the position while laminating the glass, but we were unable to move the adhesive layer 23 adhered to the glass surface, so we had to be extra careful with the positioning process.

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

(C) Results 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.

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

(A) Process for producing a light control film 100 with an adhesive layer To 50 parts by weight of an addition polymerization type silicone resin (manufactured by DuPont Toray Specialty Materials Co., Ltd.: LTC-750A), 50 parts by weight of a release adjuster (manufactured by DuPont Toray Specialty Materials Co., Ltd.: SD7292) and 0.1 parts by weight of a platinum-based curing agent (manufactured by 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 coating material for a release agent layer (coating 31 ₂ ) with a solid content of 2% by weight.

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. Then, the coating material for the release agent layer ₃₁₂ was 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.

In all other respects, the light control film 100 with an adhesive layer was manufactured in the same manner as in Example 1.

As in Example 1, the post-storage adhesion strength between the adhesive layer 23 of the resulting adhesive layer-attached light control film 100 and the blue glass surface was 0.19 N/25 mm.

In addition, the static friction coefficient between the release film 30 of the light control film 100 with an adhesive layer and the blue glass surface was 0.85.

(B) Application process First, similarly to Example 1, a cut line 30x was provided at the corner of the adhesive layer-attached light control film 100. Similar to Example 1, the cut line 30x was formed using a blade so as to form a right-angled isosceles triangle with a side length of 0.5 m and whose vertex was the corner of the adhesive layer-attached light control film 100. The cut line 30x was a straight, solid line with a depth that penetrated the release film 30 and reached the surface of the adhesive layer 23.

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 adhesive layer 23 at this position.

Then, the light control film 100 with the adhesive layer, with the edge adhesive layer 23a exposed, 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, making it impossible to position it.

As a result, we were forced to peel off the entire release film 30, exposing the entire adhesive layer 23, and attempted to bond the pieces while adjusting their position, but we were unable to move the adhesive layer 23 that was adhered to the glass surface, making it impossible to position it properly.

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

(C) Results In this example, the light control film 10 could not be attached to the glass surface of the light-receiving window without using application water. Therefore, the positioning process, temporary fixing process, and attachment 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.

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

(A) Process for producing a 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), producing a release film 30. In other respects, a light control film 100 with a pressure-sensitive adhesive layer was produced in the same manner as in Example 1.

As in Example 1, the post-storage adhesion strength between the adhesive layer 23 of the resulting adhesive layer-attached light control film 100 and the blue glass surface was 0.21 N/25 mm.

In addition, the static friction coefficient between the release film 30 of the light control film 100 with an adhesive layer and the blue glass surface was 0.90.

(B) Installation process As in Example 1, a cut line 30x was made at the corner of the light-control film 100 with an adhesive layer, and the release film 30 was removed to expose an end adhesive layer 23a in the shape of a right-angled isosceles triangle with a side length of 0.5 m and whose vertex was the corner of the light-control film 100 with an adhesive layer.

Then, as in 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 position it by sliding it over the glass surface. However, the release film 30 did not slide well over the glass surface, making it impossible to position it. Furthermore, an attempt was made to peel off the entire release film 30 to expose the entire adhesive layer 23 and then to attach it while adjusting the position, but the adhesive layer 23 adhered to the glass surface could not be moved, making it impossible to position it.

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

(C) Results 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, none of the positioning, temporary fixing, and attachment processes were 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.

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

(A) Process for producing a light control film 100 with a pressure-sensitive adhesive layer A polyester film with a thickness of 43 μm and an 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 ₃₁₁ used in Example 1 was applied to the polyester film surface and dried and cured 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 on the release film 30 during transportation from the manufacturing factory to the construction site.

In all other respects, the light control film 100 with an adhesive layer was manufactured in the same manner as in Example 1.

As in Example 1, the post-storage adhesion between the adhesive layer 23 of the resulting adhesive layer-attached light control film 100 and the blue glass surface was 0.35 N/25 mm.

In addition, the static friction coefficient between the release film 30 of the light control film 100 with an adhesive layer and the blue glass surface was 1.50.

(B) Installation process As in Example 1, a cut line 30x was made at the corner of the light-control film 100 with an adhesive layer, and the release film 30 was removed to expose an end adhesive layer 23a in the shape of a right-angled isosceles triangle with a side length of 0.5 m and whose vertex was the corner of the light-control film 100 with an adhesive layer.

Then, as in 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 position it by sliding it over the glass surface. However, the release film 30 did not slide well over the glass surface, making it impossible to position it. Furthermore, an attempt was made to peel off the entire release film 30 to expose the entire adhesive layer 23 and then to attach it while adjusting the position, but the adhesive layer 23 adhered to the glass surface could not be moved, making it impossible to position it.

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

(C) Results In this example, the results were similar to those of Comparative Examples 1 and 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, none of the positioning, temporary fixing, and attachment processes were easy. In addition, it was necessary to apply strong pressure to remove air bubbles, and therefore slight damage to the light control film 10 was confirmed.

For this reason, 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.

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

(A) Step of Producing the Light Control Film 100 with a Pressure-Sensitive Adhesive Layer First, a release film 30 was produced in the same manner as in Example 1.

Next, 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), a silane coupling agent (
0.5 parts by weight of S-1 (manufactured by Saiden Chemical Co., Ltd.) was added, and the mixture was diluted with ethyl acetate as a solvent to prepare a coating material for adhesive layer (Coating material 23 ₁ ) with a solid content of 30% by weight.

Using a comma coater, this adhesive layer coating material 23 ₁ was applied to a 38 μm thick light-release release film (E7002, manufactured by Toyobo Co., Ltd.), dried at 100°C for 2 minutes, and then aged at 40°C for 48 hours to form the adhesive layer 23.

Then, this adhesive layer 23 was transferred to the release agent layer 32 surface of the release film 30.

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 the adhesive layer 23 and release film 30 laminated in this order on one side of the light control film 100.

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

In addition, the static friction coefficient between the release film 30 of the light control film 100 with an adhesive layer and the blue glass surface was 0.45.

(B) Installation process As in Example 1, a cut line 30x was made at the corner of the light-control film 100 with an adhesive layer, and the release film 30 was removed to expose an end adhesive layer 23a in the shape of a right-angled isosceles triangle with a side length of 0.5 m and whose vertex was the corner of the light-control film 100 with an adhesive layer.

Then, as in Example 1, this light control film 100 with an adhesive layer was placed on the glass surface of the light-receiving window and slid over the glass surface to position it.

Next, when an attempt was made to temporarily attach the thus-positioned adhesive-layered light control film 100 to the glass surface using its edge adhesive layer 23a, part of the edge adhesive layer 23a adhered strongly to the glass surface, and air bubbles also 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.

Finally, the remaining release film 30 was peeled off and removed, while 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 from an application squeegee.

(C) Results 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.

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

(A) Process for producing a light control film 100 with an adhesive layer To 100 parts by weight of an acrylic adhesive coating (manufactured by Saiden Chemical Co., Ltd.: OC3949), 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) were added, and the mixture was further diluted with ethyl acetate as a solvent to prepare a coating for an adhesive layer (coating 23 ₂ ) with a solid content of 30% by weight.

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 adhesive layer coating material ₂₃₁ .

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

In addition, the static friction coefficient between the release film 30 of the light control film 100 with an adhesive layer and the blue glass surface was 0.40.

(B) Application Process The application of this adhesive layer-attached light control film 100 to the glass surface of a light-receiving window was similar to that of Example 9. Specifically, when an attempt was made to temporarily attach the positioned adhesive layer-attached 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 and remove the remaining release film 30 and attach the entire adhesive layer-attached light control film 100.

(C) Results 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.

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.

(A) Step of Producing a Light Control Film 100 with a Pressure-Sensitive Adhesive Layer The paint for the release agent layer was the same as 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 for the release agent layer ₃₁₁ with a solids 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 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.

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 having a solids content of 30% by weight.

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

Then, this adhesive layer 23 was transferred to the release agent layer 32 surface of the release film 30.

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 side of the light control film 100.

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

In addition, the static friction coefficient between the release film 30 of the light control film 100 with an adhesive layer and the blue glass surface was 0.40.

(B) Construction process As in Example 1, we first tried 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.

To achieve this, the release film 30 was completely peeled off, exposing the entire adhesive layer 23. A large amount of application water (30 liters) was then used, and while adjusting the position, strong pressure was applied with a squeegee to bond it to the glass surface. The reason such a large amount of application water was required was to simultaneously align the position and remove air bubbles, allowing for strong adhesion to be applied over a large area in one go.

(C) Results 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, since the positioning and application 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. Furthermore, the damage to the light-control film 10 was significant.

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.

(A) Step of producing a 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 _31-1 for a release agent layer with a solid content of 5% by weight. A polyester film (Lumirror T60, manufactured by Toray Industries, Inc.) with a thickness of 250 μm was used as the release film substrate 31, and the coating material _31-1 for a release agent layer was applied to one side of the film to produce the release film 30.

Furthermore, the paint 23 ₂ used in Example 10 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.), 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 (TINUVIN 109, 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 prepare a paint for the adhesive layer (paint 23 ₂ ) with a solids content of 30% by weight.

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

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.

Then, as in Example 1, the post-storage adhesion between the adhesive layer 23 of the resulting adhesive layer-attached light control film 100 and the blue glass surface was measured, and the post-storage adhesion was found to be 2.5 N/25 mm.

In addition, the static friction coefficient between the release film 30 of the light control film 100 with an adhesive layer and the blue glass surface was 0.43.

(B) Construction process As in Example 1, we first tried 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.

To achieve this, the release film 30 was completely peeled off, exposing the entire adhesive layer 23. A large amount of application water (30 liters) was then used, and while adjusting the position, strong pressure was applied with a squeegee to bond it to the glass surface. The reason such a large amount of application water was required was to simultaneously align the position and remove air bubbles, allowing for strong adhesion to be applied over a large area in one go.

(C) Results 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. Furthermore, the damage to the light-control film 10 was significant.

The above results are summarized in Table 1.

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 substrate 22: Adhesive layer 23: Adhesive layer 23: End adhesive layer 30: Release film 31: Release film substrate 32: Release agent layer 30x: Cut line

Claims (10)

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 light control film with a pressure-sensitive adhesive layer is adhered to a glass surface of a windowpane of a building or a mobile body by the pressure-sensitive adhesive layer from which 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 release film and the glass surface is 0.8 or less. The light-control film with an adhesive layer according to claim 1, wherein the adhesive layer contains a thermoplastic elastomer. The light-control film with an adhesive layer according to claim 1 or 2, wherein the thickness of the release film is 188 μm or less. The light control film with an adhesive layer according to any one of claims 1 to 3, characterized in that a cutting line is provided for cutting off at least a partial area of the release film. 5. The light control film with an adhesive layer according to claim 4, wherein the cutting line penetrates the release film. 5. The light control film with an adhesive layer according to claim 4, wherein the cut line reaches partway through the thickness of the release film. The light control 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 release film. The light control film with an adhesive layer according to any one of claims 4 to 7, wherein the cut lines or embossed lines are straight or wavy. The light control film with an adhesive layer according to any one of claims 4 to 8, wherein the cut lines or embossed lines are solid lines or dashed lines. 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 release film and the glass surface of 0.8 or less,
an edge pressure-sensitive adhesive layer exposing step of peeling off the release film at the edge of the pressure-sensitive adhesive layer-attached light control film 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 step of peeling off the remaining release film from the pressure-sensitive adhesive layer-attached light control film temporarily attached in the temporary fixing step, and bonding the exposed pressure-sensitive adhesive layer to a glass surface.
A method for attaching a light control film with an adhesive layer to a glass surface.