JP2014115534A - Daylighting sheet, daylighting device, building, and method of manufacturing daylighting sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a daylighting sheet which is easily peelable after being adhered on translucent tabular panels covering openings of a building.SOLUTION: A light-transmissive daylighting sheet is to be adhered on translucent tabular panels covering openings of a building and comprises a sheet-like sheet body and an adhesive layer which contains adhesive and is formed on one side of the sheet body. The sheet body comprises a translucent base material layer and a light scattering layer for scattering light formed on one surface of the base material layer. The light scattering layer comprises a plurality of light transmissive portions for transmitting light arranged next to each other along the one surface of the base material layer, and light scattering portions which are arranged between adjacent light transmissive portions and are filled with a light scattering material. When the daylighting sheet is adhered on the panel via the adhesive layer, adhesion between the adhesive layer and the sheet body is stronger than adhesion between the adhesive layer and the panel.

Description

  The present invention relates to a daylighting sheet, a daylighting apparatus, and a building using the daylighting sheet for incorporating outside light such as sunlight into a building or the like.

  It is well known to use a so-called window glass to form a bright and comfortable indoor space by taking in outside light such as sunlight inside a building. On the other hand, however, if the outside light incident on the window glass is taken into the room as it is, there may be a problem such as feeling glare. On the other hand, several techniques for controlling the direct sunlight and adopting the indoor side in a more comfortable manner have been proposed.

  Patent Document 1 discloses a light control sheet (lighting sheet) for sunlight intake control arranged at a site where sunlight is taken into a building. This is composed of a light-transmitting part that transmits sunlight and a light-shielding part group that absorbs sunlight, and the light-shielding part group has a plurality of light-shielding parts arranged at a predetermined pitch in one direction in the sheet. .

  Patent Document 2 discloses a plate-shaped daylighting optical element (lighting sheet) provided in an opening of a building so as to take in sunlight. This is composed of a large number of prism parts arranged on the same plane, and the slope of each prism part transmits sunlight when the elevation angle of the sun is smaller than the critical elevation angle, and all the slopes when the elevation angle is greater than or equal to the critical elevation angle. The angle of reflection is such that the total amount of light collected when the elevation angle of the sun is greater than or equal to the critical elevation angle is less than the total amount of light harvested when it is less than the critical elevation angle.

JP 2010-259406 A JP 2003-157707 A

  However, once the conventional daylighting sheet sheets disclosed in Patent Document 1 and Patent Document 2 are attached to the window glass, it has not been easy to remove them cleanly. For example, once a conventional daylighting sheet is bonded to a window glass, part of the daylighting sheet may be damaged when peeled off from the window glass, and part of the daylighting sheet (such as an adhesive layer) remains attached to the window glass. There was a case. Normally, it is considered that the daylighting sheet deteriorates faster than the window glass. When it is desired to replace only the daylighting sheet with a new one, the conventional daylighting sheet has a problem that it is difficult to cleanly remove it from the window glass as described above.

  In view of the above problems, an object of the present invention is to provide a daylighting sheet that can be easily peeled off after being bonded to an adherend such as a window glass. Moreover, the lighting device and building using this, and the manufacturing method of the said lighting sheet are provided.

  The present invention will be described below.

  The invention according to claim 1 is a daylighting sheet that is bonded to a light-transmitting plate-like panel provided in an opening of a building and transmits light, the sheet-like sheet body, and the sheet An adhesive layer containing an adhesive disposed on one side of the main body, and the sheet main body is formed on one surface of the base material layer and has a light-transmitting property, and scatters light A light scattering layer, and the light scattering layer is arranged between a plurality of light transmission parts that transmit light and are arranged along one surface of the base material layer, and adjacent light transmission parts. A light scattering part filled with a material that scatters light, and when the daylighting sheet is bonded to the panel by the adhesive layer, the adhesive force between the adhesive layer and the sheet body is It is a daylighting sheet that is stronger than the adhesive strength between the two.

  In the present invention, “adhesive strength” means that measured by a measurement method based on JIS Z0237.

  According to a second aspect of the present invention, in the daylighting sheet of the first aspect, the light scattering layer has a concave portion of 1 μm or more and 6 μm or less in the thickness direction in a portion of the surface where the light scattering portion is formed. Yes.

  The invention according to claim 3 is the daylighting sheet according to claim 1 or 2, wherein the light scattering portion is a transparent resin, and a composition that scatters light dispersed in the resin. The light transmissive part is made of a transparent resin, and the resin contained in the light scattering part and the resin constituting the light transmissive part are different resins.

  The invention according to claim 4 is the daylighting sheet according to any one of claims 1 to 3, wherein the base material layer is on one outermost surface of the sheet body and the light scattering layer of the base material layer is formed. An adhesive layer is disposed on the opposite side of the surface.

  The invention according to claim 5 is the daylighting sheet according to any one of claims 1 to 3, wherein the protective layer having translucency is on one outermost surface of the sheet main body, and one surface side of the protective layer. An adhesive layer is disposed on the other side of the protective layer, and a light scattering layer is bonded to the other surface of the protective layer via another adhesive layer.

  Invention of Claim 6 has a hard-coat layer in the outermost surface on the opposite side to the side bonded to a panel in the lighting sheet in any one of Claims 1 thru | or 5.

  The invention according to claim 7 is a plate-like panel having translucency, the daylighting sheet according to any one of claims 1 to 6 affixed to one surface of the panel, and at least the periphery of the panel. And a frame arranged so as to surround the lighting device.

  The invention according to claim 8 is a building in which the daylighting device according to claim 7 is installed in the opening.

  Invention of Claim 9 is a manufacturing method of the daylighting sheet | seat in any one of Claim 1 thru | or 6, Comprising: The composition containing an adhesive is directly coated on the surface of the layer used as the outermost layer of a sheet | seat main body. And it is a manufacturing method of a daylighting sheet provided with the adhesion layer formation process of forming an adhesion layer.

  Invention of Claim 10 is a manufacturing method of the lighting sheet of Claim 9, Comprising: The surface on the opposite side to the side in which the adhesion layer was formed among the layers used as an outermost layer after an adhesion layer formation process On the side, another layer included in the sheet body is formed.

  According to the present invention, it is possible to provide a daylighting sheet that can be easily peeled off after being bonded to an adherend such as a window glass.

It is a figure explaining 1st embodiment and is an external appearance perspective view of the building. It is the figure which looked at the lighting apparatus 10 from the front. It is a figure explaining the layer structure of the lighting panel. FIG. 3 is a diagram for explaining the form of a light scattering layer 26. FIG. 5A shows an example in which the leg of the trapezoidal cross section of the light scattering portion is convex, FIG. 5B shows an example in which the leg of the trapezoidal cross section of the light scattering portion is concave, and FIG. An example in which the leg of the trapezoidal cross section of the scattering portion is a polygonal line, FIG. 5 (d) is an example in which the bottom of the trapezoidal cross section of the light scattering portion is concave, and FIG. 5 (e) is a triangular cross section in the light scattering portion. It is an example. It is a figure explaining 2nd embodiment and is a figure explaining the layer structure of the lighting panel. It is a figure explaining the structure of the lighting panel of the comparative example 1. FIG.

  The above-described operation and gain of the present invention will be clarified from embodiments for carrying out the invention described below. Hereinafter, the present invention will be described based on embodiments shown in the drawings. However, the present invention is not limited to the embodiment. In the following drawings, dimensions and shapes may be exaggerated for easy understanding. In addition, for ease of viewing in each figure, a part of the reference numerals that are repeated may be omitted.

  FIG. 1 is a diagram illustrating the first embodiment, and is an external perspective view of a building 1 provided with a daylighting sheet 20 (see FIG. 3). The building 1 is a so-called office building, and an outer wall facing the south side is provided with a plurality of openings that allow communication between the interior and the exterior. The daylighting device 10 including the daylighting sheet 20 is disposed in the opening.

  FIG. 2 is a front view of one daylighting apparatus 10 viewed from the outdoor side. As described above, the daylighting apparatus 10 includes the frame 11 and the daylighting panel 12 arranged in the frame of the frame 11, and is configured as a so-called window. And the said lighting device 10 is arrange | positioned at the opening part of the building 1 as mentioned above.

  FIG. 3 schematically illustrates the layer configuration of the daylighting panel 12 in the vertical section of the daylighting apparatus 10 taken along the line III-III in FIG. In FIG. 3, the lighting panel 12 is shown in a posture attached to the building 1 so that the panel surface is vertical. The left side of FIG. 3 is the outdoor side, the right side is the indoor side, the upper side is the top side, and the lower side is the ground side.

  As can be seen from FIG. 3, the daylighting panel 12 includes a panel 13 and a daylighting sheet 20 bonded to the inner side surface of the panel 13. The daylighting sheet 20 includes a sheet main body 21 and an adhesive layer 22, and the sheet main body 21 includes a hard coat layer 23, a protective layer 24, an adhesive layer 25, a light scattering layer 26, and a base material layer 27 from the indoor side. It has. Hereinafter, each of these layers will be described.

  The panel 13 is a plate-shaped translucent panel having translucency used for a normal building or a vehicle window such as a glass panel or a resin panel. Therefore, a known plate glass or resin plate can be used as a member constituting the panel 13. The frame 11 described above is disposed at least around the panel 13, so that the daylighting panel 12 is attached within the frame 11.

  The base material layer 27 is a layer serving as a base material for forming the light scattering layer 26. Therefore, the base material layer 27 has a light transmitting property and supports the light scattering layer 26 so that deformation of the light scattering layer 26 can be prevented. From this point of view, as specific examples of the material constituting the base material layer 27, for example, a transparent resin mainly composed of one or more of acrylic, styrene, polycarbonate, polyethylene terephthalate, acrylonitrile and the like, epoxy acrylate and urethane acrylate The reactive resin (ionizing radiation curable resin etc.) can be mentioned.

  Although the thickness of the base material layer 27 is not specifically limited, It is preferable that they are 25 micrometers or more and 300 micrometers or less. By setting the thickness of the base material layer 27 to 25 μm or more, wrinkles are less likely to occur in the base material layer 27 in the manufacturing process of the daylighting sheet 20. Moreover, it can prevent that the sheet | seat containing the base material layer 27 becomes difficult to wind in the manufacturing process of the daylighting sheet 20 by making the thickness of the base material layer 27 into 300 micrometers or less.

The light scattering layer 26 has a light transmission part 28 and a light scattering part 29. The light transmission part 28 has the cross section shown in FIG. 3 and is arranged so as to extend in one direction along the surface of the base material layer 27 (horizontal direction in the posture arranged in the building 1). A plurality of lines are arranged at a predetermined interval in a direction different from the one direction along the surface of the layer 27 (vertical direction in the posture arranged in the building 1). In the present embodiment, the adjacent light transmitting portions 28 are connected and integrated at the end portion on the base material layer 27 side.
On the other hand, the light scattering portion 29 is disposed between the adjacent light transmission portions 28.

FIG. 4 shows an enlarged view of a part of the light scattering layer 26.
The light transmitting portion 28 is a portion that transmits light, and the surface on the base material layer 27 side and the opposite side surface (the surface on the adhesive layer 25 side) in the portion of the light scattering layer 26 where the light transmitting portion 28 is disposed. Are formed parallel and smooth. This makes it easier to see the outdoor scenery through the daylighting sheet 20. Preferably, the light transmission unit 28 transmits light without scattering. This improves the visibility of the backside scenery. Here, “transmits without scattering light” means a portion formed without adding a material that intentionally scatters, and inevitably occurs when light passes through the material. Scattering is allowed to occur.

  In the present embodiment, the light transmission portion 28 has a substantially trapezoidal cross section between the two light scattering portions 29 in the cross section shown in FIGS. 3 and 4, and the bottom bottom on the outdoor side (base material layer 27 side) is long, The indoor side (adhesive layer 25 side) is a short upper base, and the sides constituting the interface with the light scattering portion 29 are leg portions.

Examples of the material constituting the light transmitting portion 28 include transparent resins mainly composed of one or more of acrylic, styrene, polycarbonate, polyethylene terephthalate, acrylonitrile, etc., and epoxy acrylate or urethane acrylate reactive resins (ionizing radiation). Curable resin).
Here, the refractive index of the material constituting the light transmitting portion 28 may be the same as or different from the refractive index of the base material layer 27. However, if there is a difference in refractive index between the two, the possibility of light being deflected at the interface increases, so even if they are the same material or different materials, the refractive index difference is small or there is no refractive index difference. It is preferable.

  The light scattering part 29 is a part formed between two adjacent light transmission parts 28. That is, as described above, the light transmission parts 28 are arranged in parallel in the direction along the sheet surface at a predetermined interval, and a recess having a substantially trapezoidal cross section is formed between the light transmission parts 28. The concave portion in the present embodiment is a groove having a cross section having a short upper bottom on the outdoor side (base material layer 27 side) and a long lower bottom on the indoor side (adhesive layer 25 side), and the light scattering portion 29 is formed here. The light scattering portion 29 is formed by filling the material. Accordingly, the light scattering portion 29 has a cross section based on the concave portion.

  The light scattering section 29 is a layer configured to scatter and reflect the light irradiated here. For this reason, the light scattering portion 29 is filled with a material for scattering and reflecting light. The material for scattering the light is not particularly limited, and examples thereof include a composition in which a scattering agent such as a white pigment or a silver pigment is mixed in a resin (curable resin). Examples of the white pigment include metal oxides such as titanium oxide, titanium dioxide, magnesium oxide, and zinc oxide. As a silver pigment, metals, such as aluminum and chromium, are mentioned, for example. Thereby, light can be efficiently scattered and reflected. Further, as the curable resin, the same resin as that constituting the light transmitting portion 28 can be used.

  The light scattering portion 29 may be made of a material in which a transparent resin (curable resin) and a transparent scattering agent having a different refractive index are mixed. As the transparent curable resin, the same material as the light transmitting portion 28 can be used. On the other hand, examples of the transparent scattering agent include cross-linked particles obtained by polymerizing monomers mainly composed of (meth) acrylic acid ester and styrene. Specific examples of the crosslinked particles include Gantzpearl (registered trademark) manufactured by Aika Industry Co., Ltd. The cross-linked particles can be controlled in refractive index by changing the mixing ratio of acrylic acid ester and styrene. For example, the refractive index can be made about 1.49 by increasing the acrylic ratio, and the refractive index can be made about 1.59 by increasing the styrene ratio. Further, urethane cross-linked particles can be used as the scattering agent. Specific examples of the urethane cross-linked particles include Art Pearl (registered trademark) manufactured by Negami Kogyo Co., Ltd. The scattering agent can also be hollow particles.

  In addition, when the light scattering part 29 is composed of a composition in which a transparent curable resin and a transparent scattering agent having a different refractive index are mixed as described above, the light scattering part 29 is reached. The emitted light can also be transmitted and scattered and emitted. By scattering and transmitting the light that has reached the light scattering portion 29, for example, it is possible to reduce direct light while emitting, for example, sunlight incident from the outdoor side to the indoor side.

Although the refractive index of curable resin used for the light-scattering part 29 is not specifically limited, The range of 1.56 to 1.49 is preferable from versatility. Further, from the viewpoint of totally reflecting and deflecting external light incident on the interface between the light transmitting portion 28 and the light scattering portion 29 at an angle larger than the total reflection critical angle, the refractive index of the curable resin used for the light scattering portion 29 is used. Is preferably lower than the refractive index of the resin constituting the light transmitting portion 28, more preferably 1.50 to 1.49. The light deflected as described above changes its direction, and can be eliminated from direct light that gives glare by irradiating the ceiling, for example.
However, the present invention is not limited to this, and the refractive index of the curable resin used for the light scattering portion 29 and the refractive index of the resin constituting the light transmitting portion 28 may be the same or close to each other.

  The pitch at which the light scattering portions 29 are arranged in parallel is not particularly limited, but is preferably 10 μm or more and 200 μm or less. By setting the pitch of the light scattering portions 29 to 10 μm or more, the light scattering portions 29 can be prevented from becoming too fine, and the light scattering layer 26 can be easily manufactured. On the other hand, by setting the pitch of the light scattering portions 29 to 200 μm or less, the light transmitting portion 28 can be easily released from the mold when forming the light transmitting portion 28 using a mold as will be described later. .

  In addition, the size (width) of the indoor side (the opening side of the concave portion between the light transmitting portions 28 on the side opposite to the base material layer 27) in the vertical cross section of the light scattering portion 29 is not particularly limited, but is 5 μm or more and 150 μm or less. It is preferable that By setting the width to 5 μm or more, the light scattering portion 29 can be prevented from becoming too fine, and the light scattering layer 26 can be easily manufactured. On the other hand, when the width is set to 150 μm or less, the light transmitting portion 28 can be easily released from the mold when the light transmitting portion 28 is formed using a mold as described later.

  The size of the light scattering portion 29 in the thickness direction (the left-right direction in FIG. 4) is not particularly limited, but is preferably 10 μm or more and 200 μm or less. By setting the size to 10 μm or more, the light scattering portion 29 can be easily formed. On the other hand, by making this size 200 μm or less, it becomes easy to manufacture a mold used when the light transmitting portion 28 is molded. Further, when the light transmitting portion 28 is formed using a mold as described later, the light transmitting portion 28 is easily released from the mold.

In the present embodiment, an example in which the cross section of the light scattering portion 29 is an isosceles trapezoid has been described. However, the present invention is not necessarily limited thereto, and the angles of the two leg portions of the trapezoidal cross section of the light scattering portion may be different. Further, the leg part of the trapezoidal cross section of the light scattering part may be curved or broken. FIG. 5 shows the cross-sectional shape of the light scattering portion of each example.
5A shows an example of a light-scattering portion 29a having a curved trapezoidal leg, FIG. 5B shows an example of a light-scattering portion 29b having a concave trapezoidal leg, and FIG. (C) is an example of the light-scattering part 29c where the leg part of a trapezoidal cross section has a polygonal line shape.
FIG. 5D illustrates a light scattering portion 29d of an example in which the lower bottom side (opening side of a groove formed between the light transmission portions) of the trapezoidal cross section of the light scattering portion is formed in a concave shape. In this case, the inside of the concave shape is filled with the material constituting the adjacent adhesive layer 25.
FIG. 5E shows an example of the light scattering portion 29e in which the cross-sectional shape of the light scattering portion is a triangle. As described above, the light scattering portion may have a triangular cross section.

  From the viewpoint of facilitating light scattering and reflection at the interface between the light scattering portion 29 and the light transmitting portion 28, an infinite number of minute irregularities are formed at the interface between the light scattering portion 29 and the light transmitting portion 28. It is good also as a mat surface which is a surface.

  Returning to FIG. 3, the description of other configurations will be continued.

  The adhesive layer 25 is a layer for adhering and laminating the protective layer 24 and the light scattering layer 26. The material constituting the adhesive layer 25 is not particularly limited as long as it can adhere the protective layer 24 and the light scattering layer 26. As a material constituting the pressure-sensitive adhesive layer 25, for example, a known pressure-sensitive adhesive, adhesive, photo-curing resin, thermosetting resin, or the like can be used. A more specific example of the material constituting the adhesive layer 25 is an acrylic adhesive. More specifically, a pressure-sensitive adhesive combining an acrylic copolymer and an isocyanate compound can be exemplified. However, the material constituting the adhesive layer 25 is preferably a material excellent in translucency and weather resistance due to the properties of the daylighting sheet 20.

  Although the thickness of the adhesion layer 25 is not specifically limited, It is preferable that they are 10 micrometers or more and 100 micrometers or less. By setting the thickness of the adhesive layer 25 to 10 μm or more, it becomes easy to improve the adhesion between the protective layer 24 and the light scattering layer 26. Moreover, it becomes easy to make the thickness of the adhesion layer 25 uniform by making the thickness of the adhesion layer 25 into 100 micrometers or less.

  The protective layer 24 is a layer that is paired with the base material layer 27 and is disposed so that the light scattering layer 26 is sandwiched between the protective layer 24 and the base material layer 27. Thus, the light scattering layer 26 is protected together with the base material layer 27. In the present embodiment, the protective layer 24 is a layer serving as a base material for forming the hard coat layer 23. As long as the protective layer 24 has such a function, the constituent material is not particularly limited. The protective layer 24 can be made of, for example, the same material as the base material layer 27 described above.

  The hard coat layer 23 is a layer provided on the outermost surface of the daylighting sheet 20 opposite to the side bonded to the panel 13 for the purpose of protecting the surface of the daylighting sheet 20. The hard coat layer 23 can be formed as a transparent resin layer. From the viewpoint of resistance to scratches and surface contamination on the surface of the daylighting sheet 20, the hard coat layer 23 is preferably formed as a cured resin layer formed by curing a curable resin.

  As a material constituting the hard coat layer 23, for example, an ionizing radiation curable resin, other known curable resins, or the like may be appropriately adopted according to the required performance. Examples of the ionizing radiation curable resin include acrylate-based, oxetane-based, and silicone-based resins. For example, acrylate-based ionizing radiation curable resins include monofunctional (meth) acrylate monomers, bifunctional (meth) acrylate monomers, (meth) acrylate monomers such as trifunctional or higher (meth) acrylate monomers, urethane (meta ) Acrylate, epoxy (meth) acrylate, polyester (meth) acrylate and other (meth) acrylate ester oligomers or (meth) acrylate ester prepolymers. Examples of tri- or higher functional (meth) acrylate monomers include trimethylolpropane tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and the like.

  Further, the hard coat layer 23 may be added with a function of improving the stain resistance. This can be achieved, for example, by adding a silicone compound, a fluorine compound, or the like. Further, as other functions, it may have a function of improving antistatic properties and water repellency.

As materials that can be used for improving the antistatic property, PEDOT-PSS (PEDOT (Poly (3,4-ethylenedioxythiophene); 3,4-ethylenedioxythiophene polymer) and PSS (polynesulfonate) are used for the electron conduction type. ); A styrene sulfonic acid polymer)), and the ionic conductive type includes lithium salt materials.
Examples of materials that can be used to improve water repellency include fluorine compounds.

  The adhesive layer 22 is a layer for attaching the daylighting sheet 20 to the panel 13. When the daylighting sheet 20 is bonded to the panel 13 by the adhesive layer 22, the adhesive layer 22 has an adhesive force between the adhesive layer 22 and the sheet main body 21 than an adhesive force between the adhesive layer 22 and the panel 13. It is configured to be strong. By configuring the adhesive layer 22 in this manner, when the daylighting sheet 20 is peeled off from the panel 13, the adhesive layer 22 can be removed cleanly without leaving the panel 13 side.

  The material constituting the pressure-sensitive adhesive layer 22 is not particularly limited as long as the daylighting sheet 20 can be pasted on the panel 13 and satisfies the above-mentioned pressure-sensitive adhesive strength. Known pressure-sensitive adhesives, adhesives, photocuring Resin, thermosetting resin, etc. can be used. As a more specific example of the material constituting the pressure-sensitive adhesive layer 22, an acrylic pressure-sensitive adhesive can be mentioned. More specifically, a pressure-sensitive adhesive combining an acrylic copolymer and an isocyanate compound can be exemplified. However, the material constituting the adhesive layer 22 is preferably a material excellent in translucency and weather resistance in terms of the properties of the daylighting sheet 20.

  Although the thickness of the adhesion layer 22 is not specifically limited, It is preferable that they are 10 micrometers or more and 100 micrometers or less. By setting the thickness of the adhesive layer 22 to 10 μm or more, it becomes easy to improve the adhesion between the panel 13 and the daylighting sheet 20. Moreover, it becomes easy to make the thickness of the adhesion layer 22 uniform by making the thickness of the adhesion layer 22 into 100 micrometers or less.

  The adhesive layer 22 is preferably composed of a composition having an adhesive force of 1 N / 25 mm or more and 10 N / 25 mm or less after being pasted to the panel 13 made of a glass plate or the like for 24 hours or more. The upper limit of the adhesive strength of the adhesive layer 22 after being pasted to the panel 13 at room temperature and normal humidity for 24 hours or more is preferably 7 N / 25 mm or less, more preferably 5 N / 25 mm or less. Thus, the daylighting sheet 20 can be easily peeled from the panel 13 by appropriately adjusting the adhesive strength of the adhesive layer 22. The reason why the lower limit of the adhesive strength is 1 N / 25 mm is that if the adhesive strength is too weak, there is a possibility that it will peel off naturally.

  The adhesive layer 22 is bonded to the panel 13 and has an adhesive strength of 1 N / 25 mm or more and 20 N / 20 mm after heating for 1000 hours in an atmosphere of 60 ° C. and 90% relative humidity or 80 ° C. and normal humidity. It is preferably made of a material that is 25 mm or less. The upper limit of the adhesive strength of the adhesive layer 22 under the conditions is preferably 7 N / 25 mm or less, more preferably 5 N / 25 mm or less. Since the daylighting sheet 20 is used in the opening where the building is exposed, it is assumed that the daylighting sheet 20 is exposed to a high temperature condition for a long period of time. By making it possible to maintain an appropriate adhesive force even under the above severe conditions, the daylighting sheet 20 can be peeled off from the panel 13 even after being used for a long time.

  Furthermore, it is preferable that the adhesive force between the panel 13 and the adhesive layer 22 is weaker than the adhesive force of any one of a plurality of layers constituting the daylighting sheet 20. By setting it as this form, it becomes easy to peel off the lighting sheet 20 from the panel 13, without isolate | separating the layer which comprises the lighting sheet 20. FIG.

  By adjusting the adhesive force of the adhesive layer 22 as described above, the adhesive layer 22 can be removed cleanly without leaving the adhesive layer 22 on the panel 13 side when the daylighting sheet 20 is removed from the panel 13. However, the ease of peeling off the adhesive layer 22 depends not only on the adhesive strength of the adhesive layer 22, but also on the surface properties of the layer in contact with the adhesive layer 22 as described below.

  For example, the light scattering layer 26 may have a concave portion of about 1 μm or more and 6 μm or less in the thickness direction in the portion of the surface where the light scattering portion 29 is formed (see FIG. 5D). The concave portion mainly hardens the composition constituting the light scattering portion when scraping off the excess of the composition constituting the light scattering portion in the process of forming the light scattering portion 29 as described later. When it happens. Assuming that the adhesive layer 22 is formed on the surface of the light scattering layer 26 having such irregularities and the adhesive layer 22 is bonded to the panel 13, the adhesive layer 22 and the light scattering layer 26, or the adhesive The adhesive force between the layer 22 and the panel 13 is difficult to be constant over the entire surface of each layer. Therefore, when the daylighting sheet including the light scattering layer 26 is peeled off from the panel 13, even if an attempt is made to apply a force to the daylighting sheet with a certain strength and a certain angle, the surface irregularities of the light scattering layer 26 are caused. The strength and angle of the force acting between the adhesive layer 22 and the light scattering layer 26 and the panel 13 are difficult to be constant. As a result, part of the light scattering layer 26 may be damaged, and part of the daylighting sheet (such as the light scattering layer 26 and the adhesive layer 22) may remain attached to the panel 13.

  In addition, for example, when the resin used for the light scattering portion 29 and the resin used for the light transmitting portion 28 have different compositions, the light scattering layer 26 where the light scattering portion 29 and the light transmitting portion 28 appear. When the adhesive layer 22 is formed on the surface and the adhesive layer 22 is bonded to the panel 13, the adhesive force between the adhesive layer 22 and the light scattering portion 29, and between the adhesive layer 22 and the light transmitting portion 28. The strength is easily different depending on the adhesive strength. That is, the adhesive force between the light scattering layer 26 and the adhesive layer 22 is difficult to be constant over the entire layer surface. Therefore, when the daylighting sheet including the light scattering layer 26 is peeled off from the panel 13, a portion between the light scattering layer 26 and the pressure-sensitive adhesive layer 22 is applied even if a force is applied to the daylighting sheet with a certain strength and a certain angle. Due to the difference in the adhesive strength, the strength and angle of the force acting between the adhesive layer 22, the light scattering layer 26 and the panel 13 are difficult to be constant. As a result, part of the light scattering layer 26 may be damaged, and part of the daylighting sheet (such as the light scattering layer 26 and the adhesive layer 22) may remain attached to the panel 13.

  On the other hand, according to the present embodiment, the adhesive layer 22 is formed between the panel 13 and the base material layer 27, and the panel 13 and the base material layer 27 are usually made of materials having smooth surfaces and different surfaces. The configured part does not appear. Therefore, for example, fine irregularities are formed on the surface of the light scattering layer 26, or the composition of the resin used for the light scattering portion 29 and the composition of the resin used for the light transmitting portion 28 are different. However, the problem due to the surface properties of the layer in contact with the adhesive layer 22 as described above hardly occurs.

  In the present embodiment, the adhesive layer 22 is provided on the surface side of the base material layer 27 where the light scattering layer 26 is not formed. As a manufacturing method of such a daylighting sheet 20, first, a material constituting the adhesive layer 22 is directly applied to the surface of the layer (the base material layer 27 in the present embodiment) which is the outermost surface of the sheet body, and the material A separator (release film) is laminated and aged to form an adhesive layer 22. Alternatively, the material constituting the adhesive layer 22 is directly applied to the separator, and the layer (the base material layer 27 in this embodiment) that is the outermost surface of the sheet body is laminated and aged to form the adhesive layer 22. To do. Thereafter, the light scattering layer 26 is formed on the surface of the base material layer 27 opposite to the pressure-sensitive adhesive layer 22. By manufacturing the daylighting sheet 20 by such a method, the adhesion between the base material layer 27 and the adhesive layer 22 becomes strong, and after the adhesive layer 22 is bonded to the panel 13 made of a glass plate or the like, It is easy to peel the daylighting sheet 20 from the panel 13 so that the adhesive layer 22 does not remain on the panel 13.

  On the other hand, when forming the pressure-sensitive adhesive layer 22, the material constituting the pressure-sensitive adhesive layer 22 is sandwiched between the separators, and after aging, one separator is peeled off from the pressure-sensitive adhesive layer 22, and the surface of the pressure-sensitive adhesive layer 22 from which the separator has been peeled is separated from the other layers. If it is bonded to (for example, the base material layer 27), since it becomes easy to include fine bubbles between the adhesive layer 22 and the other layer, the adhesion between the adhesive layer 22 and the other layer. There is a risk that the performance will be reduced.

  In addition, forming the adhesive layer 22 as described above is preferable because the manufacturing process is simplified as compared to the case where the adhesive layer 22 is produced alone. That is, when the pressure-sensitive adhesive layer 22 is produced alone, the daylighting sheet 20 is produced by laminating separators on both sides of the pressure-sensitive adhesive layer 22, peeling off one separator and bonding the pressure-sensitive adhesive layer 22 to the base material layer 27. After that, the other separator must be peeled off and the daylighting sheet 20 must be bonded to the panel 13, but the step of laminating the separator can be reduced once by forming the adhesive layer 22 as described above. . Moreover, it becomes unnecessary to make a difference in ease of peeling between the separator bonded to one surface of the adhesive layer 22 and the separator bonded to the other surface.

  The daylighting device 10 is formed by the daylighting panel 12 including the daylighting sheet 20 described above, and this is arranged in the opening of the building 1 as shown in FIG.

  The daylighting sheet 20 is provided with the light transmission part 28 as described above, and the front and back surfaces of the light scattering layer 26 at the part where the light transmission part 28 is disposed are formed parallel and smooth. Thereby, the light accompanying the outdoor scenery can be incident on the room with its distortion suppressed, which means that the outdoor scenery can be viewed from the indoor side. Therefore, the daylighting sheet 20 has a structure in which the outdoor scenery can be easily seen.

  The daylighting sheet 20 may be provided with a configuration for adding another function to any of the above-described layers. For example, an ultraviolet absorber, a heat ray absorber, or a near infrared absorber may be added to provide an ultraviolet ray absorbing function, a heat ray absorbing function, or a near infrared ray absorbing function.

  The near-infrared absorbing function can be improved by adding or applying a near-infrared absorbing agent (near-infrared absorbing dye) to one or more of the above layers. As the near-infrared absorbing dye, it is preferable to use one that absorbs a wavelength region of 800 nm to 1100 nm. The near-infrared transmittance in the wavelength region is preferably 20% or less, and more preferably 10% or less. On the other hand, the near-infrared absorbing dye preferably has a sufficient transmittance in the visible light region, that is, in the wavelength region of 380 nm to 780 nm.

  The ultraviolet absorbing function can be improved by adding or applying an ultraviolet absorber exemplified below to one or more of the above layers. Examples of ultraviolet absorbers include benzotriazole ultraviolet absorbers (TINUVIN P, TINUVIN P FL, TINUVIN 234, TINUVIN 326, TINUVIN 326 FL, TINUVIN 328, TINUVIN 329, TINUVIN 329 FL, all manufactured by BASF Japan Ltd.), and triazine. Ultraviolet absorber (TINUVIN 1577 ED, manufactured by BASF Japan Ltd.), benzophenone ultraviolet absorber (CHIMASSORB 81, CHIMASORB 81 FL, all manufactured by BASF Japan Ltd.), benzoate ultraviolet absorber (TINUVIN 120, BASF Japan Ltd.) Manufactured).

  The heat ray absorbing function can be improved by adding or applying a heat ray absorbent exemplified below to one or more of the above-described layers. Examples of the heat ray absorbent include metal oxide ultrafine particles such as antimony-doped tin oxide (ATO) or tin-doped indium oxide (ITO) and phthalocyanine compounds.

  The daylighting panel 12 described above can be manufactured, for example, as follows. That is, the daylighting panel 12 can be manufactured by bonding the daylighting sheet 20 to the panel 13. Here, the daylighting sheet 20 can be produced, for example, as follows.

  The light scattering layer 26 in the daylighting sheet 20 can be formed by a method using a mold roll. That is, a mold roll is prepared in which irregularities capable of transferring the light transmitting portion 28 of the light scattering layer 26 are provided on the outer peripheral surface of the cylindrical roll. And the base material used as the base material layer 27 is inserted between a die roll and the nip roll arrange | positioned so as to oppose this. At this time, it is preferable that the adhesive layer 22 is formed on the surface of the substrate opposite to the side where the light scattering layer 26 is formed as described above. And a mold roll and a nip roll are rotated, supplying the composition which comprises the light transmissive part 28 between a base material and a mold roll. As a result, the concave / convex concave portions formed on the surface of the mold roll are filled with the composition constituting the light transmitting portion 28, and the composition conforms to the concave / convex surface shape of the mold roll.

  Here, as a composition which comprises the light transmissive part 28, although what was mentioned above is preferable, it is as follows more specifically. That is, the photocurable resin composition which mix | blended the reactive dilution monomer (M1) and the photoinitiator (I1) with the photocurable prepolymer (P1) can be used.

  Examples of the photocurable prepolymer (P1) include epoxy acrylate-based, urethane acrylate-based, polyether acrylate-based, polyester acrylate-based, and polythiol-based prepolymers.

  Examples of the reactive dilution monomer (M1) include vinyl pyrrolidone, 2-ethylhexyl acrylate, β-hydroxy acrylate, and tetrahydrofurfuryl acrylate.

  Examples of the photopolymerization initiator (I1) include hydroxybenzoyl compounds (2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, benzoin alkyl ether, etc.), benzoyl Formate compounds (such as methylbenzoylformate), thioxanthone compounds (such as isopropylthioxanthone), benzophenones (such as benzophenone), phosphate compounds (1,3,5-trimethylbenzoyldiphenylphosphine oxide, bis (2,4,6-) Trimethylbenzoyl) -phenylphosphine oxide and the like, and benzyldimethyl ketal and the like. Among these, the irradiation device for curing the photocurable resin composition and the curability of the photocurable resin composition can be arbitrarily selected. From the viewpoint of preventing coloring of the light transmitting portion 28, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone and bis (2,4,6-trimethylbenzoyl) are preferable. ) -Phenylphosphine oxide.

  These photocurable prepolymer (P1), reactive diluent monomer (M1) and photopolymerization initiator (I1) can be used alone or in combination of two or more.

  Light is irradiated from the base material side by a light irradiation device to the composition constituting the light transmission portion 28 sandwiched between the mold roll and the base material and filled therein. Thereby, the composition which comprises the light transmissive part 28 can be hardened, and the shape can be fixed. And the base material layer 27 and the shape | molded light transmission part 28 are released from a metal mold | die roll with a mold release roll.

  Next, the light scattering portion can be formed by filling the concave portion between the light transmission portions 28 with the composition constituting the light scattering portion 29 and curing it. In this way, the light scattering layer 26 can be formed on the base material layer 27.

  An adhesive is laminated on the light scattering layer 26 thus formed to form an adhesive layer 25, and the other surface side of the sheet (protective layer 24) having the hard coat layer 23 formed on one surface side is the adhesive layer. Paste to 25. In this way, the daylighting sheet 20 can be produced.

  FIG. 6 is a diagram for explaining the second embodiment, and is a cross-sectional view showing the layer structure of the daylighting panel 112 and corresponds to FIG. The daylighting panel 112 includes the panel 13 and a daylighting sheet 120 disposed on the indoor side of the panel 13. The daylighting sheet 120 includes a sheet-like sheet main body 121 and an adhesive layer 22, and the daylighting sheet 120 is attached to the panel 13 by the adhesive layer 22 in the same manner as the daylighting panel 12.

  Compared with the sheet main body 21 of the daylighting panel 12 described above, the sheet main body 121 has the opposite side of the light scattering layer 26 and the arrangement order of the constituent layers is different. That is, the sheet main body 121 includes a hard coat layer 23, a base material layer 27, a light scattering layer 26, an adhesive layer 25, and a protective layer 24 from the indoor side. The daylighting sheet 120 having the sheet main body 121 having such a configuration is easily peeled off after being bonded to the panel 13 as in the case of the daylighting sheet 20 described above.

Example 1
In Example 1, the lighting panel by the example of the lighting panel 12 provided with the lighting sheet 20 was produced. The details of the daylighting panel according to Example 1 are as follows.

(1) Formation of adhesive layer Adhesive of acrylic resin (trade name: SK Dyne 2094, Soken Chemical Co., Ltd., solid content 25.0%, solvents are ethyl acetate and methyl ethyl ketone) and 100 parts by mass of crosslinking agent (E -5XM, L-45, Soken Chemical Co., Ltd., solid content 5.0%) 0.28 parts by mass, 1,2,3-benzotriazole 0.25 parts by mass, diluent (toluene / methyl ethyl ketone / Cyclohexanone = 27.69 g / 27.69 g / 4.61 g) was mixed with 32.0 parts by mass to obtain an adhesive composition. This pressure-sensitive adhesive composition was directly applied to the surface of the layer that is the outermost layer of the sheet body (in this example, a base material layer (polyethylene terephthalate film, trade name: A4300, manufactured by Toyobo Co., Ltd., thickness 100 μm)) A release film (trade name: E7007, manufactured by Toyobo Co., Ltd., thickness 38 μm) was laminated on the pressure-sensitive adhesive composition and aged to form a pressure-sensitive adhesive layer. In addition, about this adhesion layer, it was 1.49 when the refractive index of 589 nm was measured using multiwavelength Abbe refractometer DR-M4 (made by Atago Co., Ltd.). Moreover, the storage elastic modulus of this adhesion layer was 0.22 MPa.

(2) Adjustment of light transmission part composition composition Bisphenol A ethylene oxide / xylylene diisocyanate / phenoxyethyl acrylate / 2-hydroxyethyl acrylate / bismuth tri (2-ethylhexanoate) = 30: 15: 50: 5: 0.02 And reacted at 80 ° C. for 10 hours to obtain a photocurable prepolymer (P1).
Bisphenol A ethylene oxide / isophorone diisocyanate / phenoxyethyl acrylate / bismuth tri (2-ethylhexanoate) = 30: 20: 50: 0.02, mixed at 80 ° C. for 10 hours, and photocurable prepolymer (P2) Got.
Next, 30 parts by mass of the photocurable prepolymer (P1), 30 parts by mass of the photocurable prepolymer (P2), 10 parts by mass of phenoxyethyl acrylate as the reactive dilution monomer (M1), the reactive dilution monomer (M2) ) As bisphenol A ethylene oxide 30 parts by weight, mold release agent (S1) as tetradecanol ethylene oxide 10 mol adduct phosphate 0.03 parts by weight, mold release agent (S2) as stearylamine ethylene oxide 15 mol adduct 0.03 parts by mass, 1 part of 1-hydroxycyclohexyl phenyl ketone (trade name: Irgacure 184, manufacturer name: BASF) as photopolymerization initiator (I1) is mixed, homogenized, and light-transmitted A part composition was obtained.
The light transmitting part constituting composition was applied at a thickness of 100 μm, and the light transmitting part constituting composition was cured by irradiating an ultraviolet ray of 800 mJ / cm ² with a high pressure mercury lamp. Using ATAGO Co., Ltd., the refractive index of 589 nm was measured and found to be 1.55.

(3) Production of mold roll A mold roll used for production of the light scattering layer was produced. The mold roll was cylindrical and was plated with copper, and the copper plated portion was cut with a cutting tool to form a groove corresponding to the light transmitting portion. A diamond tool was used as the tool. Grooves were formed by cutting the outer periphery of the copper plating layer of the mold roll at a predetermined pitch in the roll axis direction. The surface of this cut roll was chrome plated.

(4) Formation of light transmission part The base material with which the adhesion layer produced in said (1) was formed in one surface was conveyed between the metal mold | die roll produced in said (3), and a nip roll. In accordance with the conveyance of the base material, the light transmitting part constituting composition obtained in (2) above is supplied from the supply device onto the surface of the base material opposite to the surface on which the adhesive layer is formed, The light transmitting portion constituting composition was filled between the base material layer and the mold roll by a pressing force between the roll and the nip roll. Then, the light transmissive part constituent composition was cured by irradiating ultraviolet light of 800 mJ / cm ^{2 with} a high pressure mercury lamp to form a light transmissive part. Then, the light transmission part was released from the mold roll with a peeling roll, and a sheet (intermediate member) in which the light transmission part was formed on the base material layer was produced.

  The elastic modulus of the light transmitting portion was measured by applying a load to the micro indenter material using a compression micro hardness tester (FISCHER HM2000) and unloading it. At this time, the load force was 100 mN, the load speed was 4 μm / 10 seconds, and the holding time was 60 seconds. As a result, the elastic modulus of the light transmission part was 800 MPa.

(5) Adjustment of light scattering part constituent composition 42 parts by mass of urethane acrylate as the photocurable prepolymer (P3), 18 parts by mass of epoxy acrylate as the photocurable prepolymer (P4), reactive diluent monomer (M3) As 35 parts by mass of tripropylene glycol diacrylate, 5 parts by mass of methoxytriethylene glycol acrylate as the reactive diluent monomer (M4), 5 parts by mass of titanium oxide as the light scattering agent (D1), and as a photopolymerization initiator (I1), 7 parts by mass of 1-hydroxycyclohexyl phenyl ketone (trade name: Irgacure 184, manufacturer name: BASF) was mixed and homogenized to obtain a light scattering part composition.
In addition, the component except the scattering agent of this light-scattering part constituent composition was applied with a thickness of 100 μm, and cured by irradiating with an ultraviolet ray of 800 mJ / cm ² with a high-pressure mercury lamp. When the refractive index at 589 nm was measured by using Atago, it was 1.49.

(6) Formation of light-scattering part The light-scattering part structure composition obtained by said (5) was supplied from the supply apparatus to the side in which the light transmission part of the intermediate member produced by said (4) was formed. Also, using a doctor blade arranged substantially perpendicular to the traveling direction of the intermediate member, the light scattering portion constituting composition supplied on the intermediate member is filled in a substantially V-shaped groove formed between the light transmission portions. At the same time, the surplus light scattering portion constituting composition was scraped off. Thereafter, the light scattering portion constituting composition was cured by irradiating ultraviolet light of 800 mJ / cm ^{2 with} a high pressure mercury lamp, and the light scattering portion was formed by the cured light scattering portion constituting composition. In this state, a recess (dent) having a depth of 6 μm was generated on the surface of the light scattering portion. When the above process was performed once more, a concave portion (dent) having a depth of 3 μm was generated on the surface of the light scattering portion.
Thus, the lighting sheet provided with the base material layer and the light-scattering layer which has a light transmission part and a light-scattering part was produced.

(7) Production of daylighting panel The release film laminated in the above (1) was peeled off, and the daylighting sheet was bonded to a light-transmitting plate-like panel with an adhesive layer to produce a daylighting panel.

(Example 2)
In Example 2, a daylighting panel according to an example of the daylighting panel 112 including the daylighting sheet 120 was produced. The method of forming each layer is the same as that in Example 1, and details are omitted.

(Comparative Example 1)
Moreover, the lighting panel by the example of the lighting panel 212 provided with the lighting sheet 220 shown in FIG. FIG. 7 is a cross-sectional view illustrating the layer configuration of the daylighting panel 212 and corresponds to FIGS. 3 and 6. In FIG. 7, the same components as those shown in FIGS. 3 and 6 are denoted by the same reference numerals. As shown in FIG. 7, the daylighting sheet 220 according to Comparative Example 1 includes an adhesive layer 22 and a sheet body 221, and the sheet body 221 includes the hard coat layer 23, the base material layer 27, and the light from the indoor side. A scattering layer 26 is provided. Therefore, the adhesive layer 22 is formed between the light scattering layer 26 and the panel 13.

(Evaluation)
About the lighting panel concerning the said Example 1, Example 2, and the comparative example 1, the lighting sheet was peeled off from the panel 13, respectively. As a result, the daylighting sheets according to Example 1 and Example 2 were removed cleanly from the panel 13, but the daylighting sheet according to Comparative Example 1 was partly adhered to the panel 13 and peeled off neatly. I could not.

DESCRIPTION OF SYMBOLS 1 Building 10 Daylighting device 11 Frame 12 Daylighting panel 13 Panel 20 Daylighting sheet 21 Sheet main body 22 Adhesive layer 23 Hard coat layer 24 Protective layer 25 Adhesive layer 26 Light scattering layer 27 Base material layer 28 Light transmission part 29 Light scattering part 112 Daylighting panel 120 daylighting sheet 121 sheet body

Claims (10)

A daylighting sheet that is bonded to a translucent plate-like panel provided in an opening of a building and transmits light,
A sheet-like sheet main body, and an adhesive layer containing an adhesive disposed on one side of the sheet main body,
The sheet body includes a base layer having translucency, and a light scattering layer that is formed on one side of the base layer and scatters light,
The light scattering layer is
A plurality of light transmission parts that transmit light, arranged in parallel along one surface of the base material layer,
A light scattering portion disposed between adjacent light transmission portions and filled with a material that scatters light, and
A daylighting sheet in which when the daylighting sheet is bonded to the panel by the pressure-sensitive adhesive layer, the pressure-sensitive adhesive force between the pressure-sensitive adhesive layer and the sheet body is stronger than the pressure-sensitive adhesive force between the pressure-sensitive adhesive layer and the panel.   The said light-scattering layer is a lighting sheet of Claim 1 which has a recessed part of 1 micrometer or more and 6 micrometers or less in the thickness direction in the part in which the said light-scattering part was formed among the surfaces. The light scattering portion is composed of a transparent resin, and a composition containing a scattering agent that scatters light dispersed in the resin,
The light transmitting portion is made of a transparent resin;
The daylighting sheet according to claim 1 or 2, wherein the resin contained in the light scattering portion and the resin constituting the light transmission portion are resins having different compositions.   The said base material layer exists in one outermost surface of the said sheet | seat main body, and the said adhesion layer is arrange | positioned on the surface on the opposite side to the side in which the said light-scattering layer of the said base material layer was formed. The daylighting sheet according to any one of 3 above.   A protective layer having translucency is on one outermost surface of the sheet body, the adhesive layer is disposed on one surface side of the protective layer, and the other adhesive layer is interposed on the other surface side of the protective layer. The daylighting sheet according to any one of claims 1 to 3, wherein the light scattering layer is bonded.   The daylighting sheet according to any one of claims 1 to 5, which has a hard coat layer on the outermost surface opposite to the side to be bonded to the panel. A plate-like panel having translucency;
The daylighting sheet according to any one of claims 1 to 6, which is attached to one surface of the panel;
A daylighting device comprising: a frame arranged to surround at least the periphery of the panel.   A building in which the daylighting device according to claim 7 is installed in an opening. A method for manufacturing a daylighting sheet according to any one of claims 1 to 6,
A pressure-sensitive adhesive layer forming step in which the pressure-sensitive adhesive layer is formed by directly coating the composition containing the pressure-sensitive adhesive on the surface of the outermost layer of the sheet body,
A method for manufacturing a daylighting sheet. After the pressure-sensitive adhesive layer forming step, other layers included in the sheet main body are formed on the surface opposite to the side on which the pressure-sensitive adhesive layer is formed in the outermost layer.
The manufacturing method of the lighting sheet of Claim 9.

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