JP6584819B2 - Transparent heat shield member with transparent screen function - Google Patents

Description

According to the present invention, the image projected on the screen by the projector is reflected as a reflected image from the projector side, and as a transmitted image from the opposite side of the projector across the screen, that is, the observer can see the image well from both sides. The present invention relates to a transparent heat-shielding member having a transparent screen function that can be seen and the background can be seen through.

From the viewpoint of global warming prevention and energy saving, the surface of the window glass or organic transparent substrate or the inside of the window glass or organic transparent substrate is used to cut the heat rays (infrared rays) of sunlight that enters from the windows of buildings, shop show windows, automobile windows, etc. It has been widely practiced to provide a transparent heat ray cut member on the interior and to reduce the temperature in the room or in the vehicle by using these (for example, Patent Document 1). Also, recently, from the viewpoint of energy saving throughout the year, not only the heat shield that cuts the heat rays that cause the temperature rise in the summer, but also the outflow of heating heat from the room in the winter through the translucent member from the room A transparent heat-insulating and heat-insulating member that suppresses far-infrared rays emitted to the outside (reflects far-infrared rays to the inside of the room) and also provides heat insulation properties that reduce the heating load has been proposed as a solar radiation adjustment film and put on the market. (For example, Patent Documents 2 to 4).

By the way, in recent years, in particular, commercial facilities and convenience stores,
In store windows such as department stores, clothing, and automobile stores, advertisement windows, posters, and large-screen displays can be used as advertisements, information, and information media by attaching a transparent screen to windows and show windows. A large screen is used to project and display advertisements, product information, and other various content images from the indoor side with a projector while maintaining transparent visibility at a level where indoor conditions and products can be seen from the outside. Digital signage is attracting attention because it has a very high eye-catching effect for people outside the room, it is easy to respond to changes in content, and it is simple. Also in automobiles, it is called a combiner placed near part of the windshield surface, near the rearview mirror, or near the driver's eyes so that the driver can read the navigation information without moving the viewpoint significantly. A head-up display device (HUD) that uses a transparent or translucent beam splitter or the like to project and display from a small projector, or projects and displays a virtual image through a windshield has attracted attention (for example, Patent Documents 5 to 8). ).

Patent No. 4190657 JP2013-010341A JP2013-151103A International Publication WO2012 / 096304 Pamphlet Patent 3993980 JP 2013-210454 A Patent 4822104 JP 2011-1113068 A

In the heat-shielding members of Patent Documents 1 to 4, the window itself can be given a heat-shielding function or a heat-insulating and heat-insulating function, but a transparent screen function for projecting the content projected from the projector is given. It has not been designed, nor is it designed or described in consideration of it, so it hardly functions as a transparent screen for digital signage.

That is, Patent Document 1 discloses an infrared shielding film having a configuration in which an infrared shielding layer made of an ionizing radiation curable resin in which a rare earth metal-based infrared shielding agent is dispersed is coated on a PET film. Although near infrared rays are shielded by absorption, there is no heat insulating function to reflect far infrared rays, and as far as reference examples and examples are seen, the haze value is about 1
Since the component does not include at least an element that sufficiently scatters light and is not designed or described in consideration of it, it does not function as a transparent screen for digital signage. It is.

In Patent Document 2, as a heat ray reflective film, a heat ray reflective layer comprising a metal oxide thin film / metal thin film / metal oxide thin film is provided on a PET film by a sputtering method, and a hard coat layer is applied on the heat ray reflective layer. Although it has been disclosed that the polyolefin resin film such as OPP or COP is laminated with an adhesive layer, the haze value of the ZEONOR film used in the examples is as small as 0.1%, Although the haze value of the OPP film used in another example is unknown, the haze value of the OPP film generally used for the protective layer of the transparent heat ray reflective film that is commercially available is at most 3%. Therefore, at least an element that sufficiently scatters light is not included in the component member, and neither the design nor the description considering it is described. As the transparent screen for Jitarusaineji, but most do not work.

Further, in Patent Document 3, as a transparent laminated film, a transparent laminated portion in which a metal oxide thin film and a metal thin film are alternately laminated on a PET film is provided by a sol-gel method and a sputtering method,
An example is disclosed in which an olefin resin film such as OPP is bonded to the transparent laminated portion with an adhesive layer, and a protective layer made of silicon oxide is further coated on the olefin resin. The haze value of the OPP film used in this product is as small as 2%, so that at least elements that sufficiently scatter light are not included in the structural members, and the design and description that take it into account are not included. As a transparent screen for signage,
It doesn't work very much.

Moreover, in patent document 4, as a far-infrared reflection laminated body, the metal layer which contains 95-100 mass% of silver (Ag) on the PET film, and the metal layer which contains 95-100 mass% of silver (Ag); One or more selected from the group consisting of a phosphoric acid group, a sulfonic acid group, and an amide group is provided on the far-infrared reflective layer by sputtering a far-infrared reflective layer comprising a multilayer of metal oxide and / or metal nitride layers. However, at least elements that sufficiently scatter light are not included in the constituent members, and designs that take this into account are also described. Therefore, it does not work as a transparent screen for digital signage.

On the other hand, in the transparent screen members of Patent Documents 5 to 7, by pasting on the window, the transparent screen function for projecting the content projected from the projector can be given to the window itself. Since it does not have a function of reflecting infrared rays and neither is designed nor described in consideration thereof, it hardly functions as a transparent heat-insulating member or a transparent heat-insulating / insulating member.

That is, in Patent Document 5, as a transmission screen, on glass or PET film,
Apply polyvinyl butylal resin, polystyrene resin, polyester resin, polyurethane adhesive, UV curable acrylate resin, etc. in which light diffusion particles such as acrylic resin particles, silicone resin particles, polystyrene resin particles are dispersed. However, none of the materials shields near-infrared rays and does not reflect far-infrared rays, and neither design nor description is taken into account. As a heat-insulating member or a transparent heat-insulating / insulating member, it hardly functions.

In Patent Document 6, as a transmission type screen, amorphous synthetic silica, alumina, or alumina hydrate is present in a hydrophilic resin such as fully or partially saponified polyvinyl alcohol or cation-modified polyvinyl alcohol on a PET film. However, none of these materials is a material that shields near infrared rays and does not reflect far infrared rays. Therefore, it does not function as a transparent heat-insulating member or a transparent heat-insulating / insulating member.

In Patent Document 7, as a projection screen, a PET film in which a polarization selective reflection layer made of a cholesteric liquid crystal resin having a selective reflection center wavelength in the visible light region is coated, and a hologram photosensitive material made of a photopolymer or the like are coated. Although it has been disclosed that a PET film on which a transmission type volume hologram has been recorded by exposure is bonded to both surfaces of the glass with an adhesive, both materials are disclosed within the scope of Patent Document 7. It does not shield near infrared rays, does not reflect far infrared rays, and is not designed or described in consideration of it, so it does not function as a transparent heat shield member or transparent heat shield member. is there.

Further, in Patent Document 8, a transmission screen comprising a polyvinyl acetal resin in which nanodiamond particles having a very high refractive index as light diffusing particles are dispersed on glass or laminated into glass as it is. However, none of the materials shields near infrared rays, does not reflect far infrared rays, and is not designed or described in consideration thereof. As a heat insulation member, it hardly functions.

As described above, the windows existing in many living spaces are required to have the above-described heat shielding function or thermal insulation function from the viewpoint of energy saving, and from the viewpoint of digital signage, as described above. In spite of the requirement to provide a transparent screen function, surprisingly, no member having both functions at the same time exists as far as the present inventor knows, and its idea It was not even done.

Recently, a transparent screen for a window display is required to have a high visibility that allows a content image projected from a projector to be viewed from a wide angle in order to maximize the function as a digital signage. Of course, outside the window with a transparent screen (the opposite side of the projector across the screen)
In addition to the visibility when viewing the content video as a transparent video, the opportunity to view the content video projected on the transparent screen from the window (projector side across the screen) as a reflected video is gradually increasing. Therefore, a transmissive screen having excellent visibility from the inside and outside of the window, that is, visibility from both sides of the screen, has been desired. However, since a commercially available transmissive transparent screen has a strong forward scattering property, a clear transmission image can be obtained from the opposite side of the projector across the screen. However, since the back scattering property is not so strong, the projector side As a reflection image seen from
Although it can be visually recognized, the brightness (luminance) is low and there is a feeling of blurring, and it cannot be said that the image clarity is sufficient.

The purpose of the present invention is as a solar control transparent window film for energy saving, excellent in heat shielding or heat insulating heat insulation, and as a transparent screen for digital signage, visibility of the projected image from both sides of the screen, In particular, in terms of reflection visibility from the projector side, a transparent heat-shielding member or transparent heat-shielding member with a transparent screen function that is excellent in brightness (brightness) and image sharpness (low blur) and allows the background to be seen well. The object is to provide a heat insulating member.

As a result of intensive studies to solve the above-mentioned problems, the inventors of the present application have found that the transparent substrate has at least (1) an infrared reflective layer having a metal layer, a metal oxide layer and / or a metal nitride layer. And (2) a light diffusing layer in which light diffusing particles are dispersed in a transparent resin, and in the transparent member, (3) a visible light reflectance of 12% or more, 30 %Less than,
(4) A transparent member having a haze value of 5% or more and 35% or less, and (5) a heat shielding coefficient of 0.69 or less,
The background can be seen through, and as an energy-saving window film, it has excellent heat insulation,
In addition, as a transparent screen for digital signage, the brightness (luminance) of the projected image can be seen from both sides of the screen, especially the reflection visibility from the projector side.
The present inventors have found that the image sharpness (less blur) is unexpectedly excellent, and have made the present invention.

The present invention has a transparent screen function that allows the image projected on the screen from the projector to be viewed from both sides as a reflected image from the projector side, and as a transmitted image from the opposite side of the projector across the screen. A transparent heat shield member,
The transparent heat-shielding member having the transparent screen function is at least with respect to the transparent substrate.
(1) an infrared reflecting layer having a metal layer, a metal oxide layer and / or a metal nitride layer, and
(2) a light diffusing layer in which light diffusing particles are dispersed in a transparent resin,
A transparent member having, and
(3) Visible light reflectance measured according to JIS R3106-1998 is 12% or more, 30
%Less than,
(4) haze value measured according to JIS K7136-2000 is 5% or more, 35% or less,
(5) The shielding coefficient measured according to JIS A5759-2008 is 0.69 or less,
It is characterized by being.

According to the transparent member having such a configuration, the infrared reflection layer having the metal layer and the metal oxide layer and / or the metal nitride layer can reflect infrared rays in the range from near infrared rays to far infrared rays. Good thermal barrier properties are obtained, while visible light reflectance is 12-30.
% Can be reflected moderately and most of the remainder can be transmitted. Therefore, the light diffusing particles are dispersed in a transparent resin and have a predetermined haze value. Light scattering and reflection characteristics are obtained, and when the transparent member is used by being bonded to a transparent substrate such as a window glass with a transparent adhesive or the like, the background can be seen well, and a transparent heat shielding member, that is, for energy saving. This is very useful because it can be used as a transparent screen for digital signage that can be used as a transparent film for adjusting solar radiation and can be used to visually recognize content images projected by a projector from both sides.

Moreover, in the transparent heat-insulating member having the transparent screen function of the present invention, JIS A57
The visible light transmittance measured according to 59-2008 is preferably 65% or more. According to such a configuration, good transmission visibility is obtained, and when the transparent member is used by being bonded to a transparent substrate such as a window glass with a transparent adhesive, the transparency of the transparent substrate is not impaired. The background and situation inside and outside can be seen well from any position inside or outside.

Furthermore, in the transparent heat-shielding member having the transparent screen function of the present invention, the outermost surface layer (air side) contains at least an ionizing radiation curable resin or a thermosetting resin in a state of being used by being attached to a transparent substrate. The protective layer is preferably formed as a hard coat layer. According to this configuration, it is possible to prevent the surface from being damaged when the transparent heat-shielding member having a transparent screen function is attached to the transparent substrate or cleaned.

Furthermore, in the transparent heat-shielding member having a transparent screen function of the present invention, the protective layer is formed on the infrared reflective layer via a primer layer made of a polyolefin resin modified with acid, acid anhydride or hydroxyl group. It is preferable to laminate. According to such a configuration, better adhesion can be obtained between the protective layer and the infrared reflective layer, and the above-mentioned adhesion can be ensured without impeding the provision of heat insulation described later. be able to.

Furthermore, in the transparent heat shielding member having the transparent screen function of the present invention, JIS
The vertical emissivity value measured according to R3106-2008 is preferably 0.50 or less. According to such a configuration, since far infrared rays can be reflected more efficiently, when the transparent member is used by being attached to a transparent substrate such as a window glass with a transparent adhesive or the like, for example, from indoors in the winter season. The heat insulation which suppresses the outflow of heating heat and reduces the heating load can be imparted together with the heat shielding property.

In addition, what has "heat insulation" said by this invention is defined as the value of the vertical emissivity measured according to JIS R3106-2008 being 0.50 or less. Vertical emissivity value is 0
. If it is 50 or less, the thermal conductivity 5.1, which is an index of heat insulation in the old JIS A5759 C1, is 5.1.
It is easy to satisfy less than W / (m ² · K).

Furthermore, in the transparent heat shielding member having the transparent screen function of the present invention, JIS
More preferably, the vertical emissivity value measured according to R3106-2008 is 0.30 or less. According to such a configuration, since far infrared rays can be reflected more efficiently, when the transparent member is used by being attached to a transparent substrate such as a window glass with a transparent adhesive or the like, for example, from indoors in the winter season. High heat insulation that further suppresses the outflow of heating heat and further reduces the heating load can be imparted together with the heat shielding property. Vertical emissivity value is 0
. If it is 30 or less, it will be easy to satisfy a heat transmissivity of 4.5 W / (m ² · K) or less.

According to the present invention, the solar control transparent window film for energy saving is excellent in heat-shielding or heat-insulating and heat-insulating properties, and the transparent screen for digital signage is visible from both sides of the projected image, A transparent heat insulating member or transparent heat insulating heat insulating member having a transparent screen function that is excellent in brightness (luminance) and image sharpness (low blur) and has a transparent background that can be seen through the background, particularly in terms of reflection visibility from the projector side. Can be provided.

FIG. 1 is a schematic cross-sectional view showing an example of a transparent heat shielding member having a transparent screen function of the present invention. FIG. 2 is a schematic cross-sectional view showing another example of the transparent heat-shielding member having the transparent screen function of the present invention. FIG. 3 is a schematic sectional view showing another example of the transparent heat-shielding member having the transparent screen function of the present invention. FIG. 4 is a schematic cross-sectional view showing another example of the transparent heat-shielding member having the transparent screen function of the present invention. FIG. 5 is a schematic sectional view showing another example of the transparent heat-shielding member having the transparent screen function of the present invention. FIG. 6 is a schematic cross-sectional view showing another example of the transparent heat-shielding member having the transparent screen function of the present invention. FIG. 7 is a schematic cross-sectional view showing another example of the transparent heat-shielding member having the transparent screen function of the present invention. FIG. 8 is a schematic cross-sectional view showing an example in which a transparent heat shielding member having a transparent screen function of the present invention is attached to a glass plate. FIG. 9 is a schematic cross-sectional view showing an example of a conventional transparent heat shield member. FIG. 10 is a schematic cross-sectional view showing an example of a conventional transparent screen.

The transparent heat-shielding member having a transparent screen function of the present invention comprises at least (1) an infrared reflective layer having a metal layer, a metal oxide layer and / or a metal nitride layer, and ( 2) a transparent member having a light diffusing layer in which light diffusing particles are dispersed in a transparent resin, and (3) a visible light reflectance measured according to JIS R3106-1998 of 12% or more,
30% or less, (4) haze value measured according to JIS K7136-2000 is 5% or more,
35% or less, (5) The shielding coefficient measured according to JIS A5759-2008 is 0.69 or less.

  Hereinafter, the structural example of the transparent thermal-insulation heat insulation member of this invention is demonstrated based on drawing.

FIG. 1 is a schematic cross-sectional view showing an example of a transparent heat shielding member having a transparent screen function of the present invention. In FIG. 1, a transparent heat-shielding member 10 having a transparent screen function includes an infrared reflecting layer 12 and a protective layer 14 on one surface of a transparent substrate 11, and on the other surface of the transparent substrate 11,
The light diffusion layer 15 and the pressure-sensitive adhesive layer 16 are provided. Although not shown, a release film is provided on the pressure-sensitive adhesive layer 16.

FIG. 2 is a schematic sectional view showing another example of the transparent heat-shielding member having the transparent screen function of the present invention. In FIG. 2, a transparent heat-shielding member 10 having a transparent screen function includes an infrared reflection layer 12, a primer layer 13, and a protective layer 14 on one surface of a transparent substrate 11, and the other side of the transparent substrate 11. The light diffusion layer 15 and the pressure-sensitive adhesive layer 16 are provided on the surface.
Also,

  Furthermore, FIG. 3 is a schematic sectional view showing another example of the transparent heat-shielding member having the transparent screen function of the present invention. In FIG. 3, the transparent heat shield member 10 having a transparent screen function has a configuration in which the light diffusion layer 15 and the pressure-sensitive adhesive layer 16 in FIG. 1 are replaced with a light diffusion pressure-sensitive adhesive layer 17.

Furthermore, FIG. 4 is a schematic sectional view showing another example of the transparent heat-shielding member having the transparent screen function of the present invention. In FIG. 4, the transparent heat-shielding member 10 having a transparent screen function includes a light diffusion layer 15, an infrared reflection layer 12, a primer layer 13, and a protective layer 14 on one surface of a transparent substrate 11. The other surface of the material 11 includes a pressure-sensitive adhesive layer 16.

Furthermore, FIG. 5 is a schematic sectional view showing another example of the transparent heat-shielding member having the transparent screen function of the present invention. In FIG. 5, a transparent heat-shielding member 20 having a transparent screen function includes an infrared reflection layer 12, a primer layer 13, a light diffusion layer 15, and a protective layer 14 on one surface of a transparent substrate 11, and a transparent substrate. The other surface of the material 11 includes a pressure-sensitive adhesive layer 16.

FIG. 6 is a schematic cross-sectional view showing another example of the transparent heat-shielding member having the transparent screen function of the present invention. In FIG. 6, the transparent heat-shielding member 10 having a transparent screen function includes a light diffusion layer 15 and a protective layer 14 on one surface of the transparent substrate 11, and on the other surface of the transparent substrate 11, The configuration includes an infrared reflecting layer 12 and an adhesive layer 16.

Furthermore, FIG. 7 is a schematic sectional view showing another example of the transparent heat-shielding member having the transparent screen function of the present invention. In FIG. 7, the transparent heat-shielding member 10 having a transparent screen function includes a protective layer 14 on one surface of the transparent substrate 11, and an infrared reflecting layer 12, light on the other surface of the transparent substrate 11. The structure includes a diffusion adhesive layer 17.

FIG. 8 is a schematic cross-sectional view showing an example in which a transparent heat shielding member having a transparent screen function of the present invention is attached to a glass plate. In FIG. 8, the transparent heat-insulating member 1 having a transparent screen function
0 includes an infrared reflecting layer 12, a primer layer 13, and a protective layer 14 on one surface of the transparent substrate 11, and a light diffusion pressure-sensitive adhesive layer 17 and a glass plate 18 on the other surface of the transparent substrate 11. It comprises the composition provided with.

FIG. 9 is a schematic cross-sectional view showing an example of a conventional transparent heat shield member. In FIG. 9, the transparent heat shielding member 20 includes a protective layer 14 on one surface of the transparent substrate 11, and an infrared reflective layer 12 and an adhesive layer 16 on the other surface of the transparent substrate 11. Consisting of

FIG. 10 is a schematic cross-sectional view showing an example of a conventional transmissive transparent screen. In FIG. 10, the transparent screen 30 includes the light diffusion layer 15 and the protective layer 14 on one surface of the transparent base material 11, and the pressure-sensitive adhesive layer 16 on the other surface of the transparent base material 11. Consists of configuration.

[Transparent substrate]
The transparent substrate constituting the transparent heat-shielding member having the transparent screen function of the present invention is not particularly limited as long as it has optical transparency. Examples of the transparent substrate include polyester resins (eg, polyethylene terephthalate, polyethylene naphthalate, etc.), polycarbonate resins, polyacrylate resins (eg, polymethyl methacrylate), alicyclic polyolefin resins, Polystyrene resin (eg, polystyrene, acrylonitrile / styrene copolymer (AS resin), etc.), polyvinyl chloride resin,
A resin obtained by processing a resin such as a polyvinyl acetate resin, a polyether sulfone resin, a cellulose resin (for example, diacetyl cellulose, triacetyl cellulose, etc.) or a norbornene resin into a film shape or a sheet shape can be used. Examples of methods for processing the resin into a film or sheet include an extrusion molding method, a calender molding method, a compression molding method, an injection molding method, a method in which the resin is dissolved in a solvent, and the like. You may add additives, such as antioxidant, a flame retardant, a heat-resistant agent, a ultraviolet absorber, a slipping agent, an antistatic agent, to the said resin. Moreover, you may provide an easily bonding layer on the said transparent base material as needed.
The thickness of the transparent substrate is, for example, 10 to 500 μm, and is preferably 25 to 125 μm in consideration of workability and cost.

[Infrared reflective layer]
The infrared reflective layer constituting the transparent heat-shielding member having the transparent screen function of the present invention is composed of a laminate having at least a metal layer, a metal oxide layer and / or a metal nitride layer. The infrared reflective layer has a structure in which two layers of (1) a metal layer, (2) a metal oxide layer or a metal nitride layer are laminated in this order on the transparent substrate, or (1) a metal Oxide layer or metal nitride layer,
A structure in which three layers of (2) a metal layer and (3) a metal oxide layer or a metal nitride layer are laminated in this order is preferable. Among them, from the viewpoint of improving visible light transmittance, on the transparent substrate, (1) metal oxide layer or metal nitride layer, (2) metal layer, (3) metal oxide layer or metal nitride 3 of layers
More preferably, the layers are stacked in this order. By adopting this configuration, it is possible to improve visible light transmittance while maintaining infrared reflection performance. In addition, the infrared reflective layer may be formed on the transparent substrate as necessary, for example, metal layer / metal oxide layer / metal layer / metal oxide layer /, as long as the effect of the present invention is not hindered. 4 layers, 6 layers, 8 layers, etc. or metal oxide layer / metal layer / metal oxide layer / metal layer / metal oxide layer /, etc. 5 layers, 7 layers, 9 layers may be used. .

Further, a metal layer or a metal suboxide layer in which the metal is partially oxidized may be provided as a barrier layer for preventing corrosion of the metal layer between the metal layer and the metal oxide layer, and between the metal layer and the metal nitride layer. .

As a material for forming the metal layer, a metal such as silver, copper, gold, platinum, aluminum, or an alloy material thereof having high electrical conductivity and excellent far-infrared reflection performance among general metals is appropriately used. Although possible, it is preferable to use silver or a silver alloy having the highest electrical conductivity for the metal layer. These materials are a metal oxide layer or a metal nitride layer that is formed directly on the transparent substrate or previously on the transparent substrate by a dry coating method such as sputtering, vapor deposition, or plasma CVD. Or as a metal layer on the metal oxide layer or metal nitride layer of the metal layer / metal oxide layer or metal nitride layer repeatedly formed on the transparent substrate. Can do. The first layer of the metal layer may be formed on the transparent substrate via another layer such as an easy adhesion layer, a hard coat layer, or a light diffusion layer.

The material for forming the metal oxide layer and the metal nitride layer has a refractive index of 1.7 to 2 which can be an optical compensation layer having an antireflection function with respect to the metal thin film from the viewpoint of improving visible light transmittance.
. Dielectrics in the range of 8 are preferred, for example, metal oxides such as indium tin oxide, indium zinc oxide, indium oxide, titanium oxide, tin oxide, zinc oxide, zinc tin oxide, niobium oxide, aluminum oxide, silicon nitride Metal nitrides such as aluminum nitride can be used as appropriate. These materials can be applied directly on the transparent substrate by a dry coating method such as sputtering, vapor deposition, or plasma CVD, or on a metal layer previously formed on the transparent substrate, or on the transparent substrate. It can be formed as a metal oxide layer or a metal nitride layer on the metal layer of the metal oxide layer or metal nitride layer / metal layer repetitive laminate previously formed thereon. The first layer of the metal oxide layer or metal nitride layer may be formed on the transparent substrate via another layer such as an easy adhesion layer, a hard coat layer, or a light diffusion layer.

The thickness per layer of the metal layer, metal oxide layer, and metal nitride layer is not particularly limited, but the near infrared ray that the transparent heat-shielding member having the transparent screen function finally requires The reflection performance (shielding coefficient), far-infrared reflection performance (vertical emissivity), visible light reflectance, and visible light transmittance may be adjusted as appropriate.

The appropriate thickness of the metal layer varies depending on the refractive index, thickness, stack structure, etc. of the metal oxide or metal nitride layer to be stacked. It is preferable to adjust appropriately. If the thickness is less than 5 nm, the infrared reflection performance of the transparent heat-shielding member having the above-mentioned transparent screen function is lowered, and there is a possibility that the heat-shielding performance and the heat insulation performance are lowered. When the thickness exceeds 20 nm, the visible light transmittance is lowered, and the background transmission visibility may be lowered. By setting the thickness of the metal layer in the above range and forming a laminate appropriately combined with the metal oxide layer and metal nitride layer described later, the shielding coefficient of the transparent heat shielding member having the transparent screen function is 0. .69 or less.

The thicknesses of the metal oxide layer and the metal nitride layer are preferably adjusted as appropriate in the range of 2 to 80 nm according to the refractive index and thickness of the material used for the metal layer. If the thickness is less than 2 nm, the effect as a light compensation layer on the metal layer is small, the visible light transmittance of the transparent heat-shielding member having the transparent screen function is not significantly improved, and the background transmission visibility May decrease. In addition, since the metal oxide and metal nitride also serve to suppress corrosion of the metal layer,
If the thickness is less than 2 nm, the corrosion inhibiting effect of the metal layer may be reduced. 80n thick
If it exceeds m, further effects as a light compensation layer for the metal layer cannot be obtained, and the visible light transmittance gradually decreases, and there is a possibility that the background transmission visibility may be reduced.

Note that the visible light reflectance of the transparent heat-shielding member having the infrared reflective layer is such that the brightness (in the reflective visibility from the projector side does not hinder the visibility of the transmitted image when the image is projected by the projector). In order to obtain a reflected image excellent in (luminance) and image sharpness (small blur), it is necessary to set it to 12% or more and 30% or less. If the visible light reflectance is less than 12%, the brightness (brightness) of the reflected image and image sharpness (low blur) may be inferior. If the visible light reflectance exceeds 30%, the glare of the reflected image becomes too strong, the half mirror feeling becomes too strong and the background transmission visibility decreases, and the brightness (luminance) of the transmitted image decreases. There is a risk.

In order to set the visible light reflectance to 12% or more and 30% or less, the thicknesses of the metal layer, the metal oxide layer, and the metal nitride layer may be appropriately adjusted within the above-described ranges. The visible light reflectance is preferably set to 15% or more and 25% or less. By setting the visible light reflectance in such a range, the projection light of the projector is reflected appropriately, and the weak backscattering property of the light diffusion layer can be covered, so the brightness of the reflected image (luminance) ), Image clarity (less blur) is improved.

In a conventional reflective screen, for example, a metal-deposited layer such as aluminum or a transfer metal foil layer, or a layer obtained by dispersing or coating a metal-deposited film or flakes obtained by pulverizing a metal foil is used as a visible light reflecting layer. Basically, it has an opaque configuration that hardly transmits visible light. That is, when these materials are used, there is a limit to the balance control between visible light transmittance and reflectance, and the prevention and homogenization of thin film metal when the visible light transmittance is improved. Even if the rate is improved, it is practically 40 to 50% at most.

In contrast, in the present invention, as described above, by laminating a metal oxide layer and / or a metal nitride layer on a metal layer, while maintaining infrared reflection performance necessary for heat insulation or heat insulation, the background Control of the balance between the transmittance of visible light necessary for ensuring visibility and the reflectance of visible light necessary for improving the visibility of reflected images, and the metal layer, metal oxide layer and / or metal nitriding By combining the stack of physical layers and the light diffusing layer, the reflected visibility from the projector side of the projected image does not interfere with the visibility of the transmitted image, and the brightness (brightness) and image clarity ( However, it is novel in that it has been found to improve unexpectedly.

The average reflectance of far infrared light having a wavelength of 5 to 25.2 μm of the infrared reflective layer is preferably set to 80% or more. Thereby, the value of the vertical emissivity of the transparent heat shielding member of the present invention is reduced to 0.
. Since it becomes easy to design to 50 or less, it is suitable at the point of providing a heat insulation function.

[Light diffusion layer]
The light diffusing layer constituting the transparent heat shielding member having the transparent screen function of the present invention comprises a layer in which light diffusing particles are dispersed in a transparent resin. The transparent resin generally has a refractive index different from the refractive index of the light diffusing particles dispersed in the resin. The refractive index of the transparent resin is 1.45 to
It is preferable to select appropriately within the range of 1.60. The refractive index of the light diffusing particles is not particularly limited as long as it is different from the refractive index of the transparent resin (lower or higher), but is appropriately in the range of 1.30 to 2.40. Preferably selected, 1.40 to 1.6
It is more preferable to select appropriately within the range of 5. The absolute value of the difference in refractive index between the transparent resin and the light diffusing particles is preferably set in the range of 0.01 to 0.20. By setting the absolute value of the difference in refractive index within such a range, a light diffusion layer having a desired haze value can be obtained.

The transparent resin used in the light diffusing layer is not particularly limited as long as it has optical transparency, but (meth) acrylic resins, acrylic urethane resins, polyester resins, polyester acrylate resins, polyurethanes. (Meth) acrylate resin, epoxy (meth) acrylate resin, polyurethane resin, epoxy resin, polycarbonate resin, cellulose resin, acetal resin, vinyl resin, polyethylene resin, polystyrene resin, polypropylene resin , Ethylene / vinyl acetate resin, polyamide resin, polyimide resin, melamine resin, phenol resin, silicone resin,
Thermoplastic resins such as fluorine resins, thermosetting resins, ionizing radiation curable resins, natural rubber, recycled rubber, chloroprene rubber, nitrile rubber, rubber resins such as styrene / butadiene rubber, etc. Resins, adhesives, and pressure-sensitive adhesives can be suitably used. The transparent resin may be added with one or more various additives such as a crosslinking agent, an ultraviolet absorber, an antioxidant, an antistatic agent, a flame retardant, a plasticizer, and a colorant depending on the purpose. It may be a thing. The refractive index of the transparent resin is preferably selected as appropriate in the range of 1.45 to 1.60.

Among the transparent resins, a pressure-sensitive adhesive having pressure-sensitive adhesive property at room temperature is particularly preferably used. By using an adhesive for the transparent resin in which the light diffusing particles are dispersed, the roles of the light diffusing layer and the adhesive layer can be doubled, which is preferable in terms of processing cost. Examples of the pressure-sensitive adhesive include acrylic resins, silicone resins, polyester resins, epoxy resins, polyurethane resins and the like. In particular, acrylic resins have high optical transparency, It is more suitably used because it has high performance and has a proven track record and is relatively inexpensive.

Examples of the acrylic pressure-sensitive adhesive include acrylic acid and its ester, methacrylic acid and its ester, homopolymers or copolymers of acrylic monomers such as acrylamide and acrylonitrile, and at least one acrylic monomer and acetic acid. Examples thereof include copolymers with vinyl monomers such as vinyl, maleic anhydride, and styrene. In particular, suitable acrylic pressure-sensitive adhesives include alkyl acrylate main monomers such as methyl acrylate, ethyl acrylate, butyl acrylate, and 2-ethylhexyl acrylate, which are components for developing adhesiveness, and a cohesive force. Vinyl acetate as a component,
Acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic anhydride, hydroxylethyl methacrylate, which are monomers for improving adhesion and imparting crosslinking points, as well as monomers such as acrylamide, acrylonitrile, styrene, and methacrylate ,
Examples thereof include those obtained by appropriately copolymerizing monomers having functional groups such as hydroxylpropyl methacrylate, dimethylaminoethyl methacrylate, methylolacrylamide, and glycidyl methacrylate. Tg (glass transition temperature) of the acrylic adhesive is −60 to −
It is preferably in the range of 10 ° C. and having a weight average molecular weight in the range of 100,000 to 2,000,000, more preferably in the range of 500,000 to 1,000,000. In the acrylic adhesive, if necessary, isocyanate, epoxy,
One or a mixture of two or more metal chelate-based crosslinking agents can be used.

Examples of the acrylic pressure-sensitive adhesive include ionizing radiation curable paints in which a photopolymerization initiator or the like is blended with an oligomer having a (meth) acryl group at a terminal or a side chain and a (meth) acrylic monomer. Since such an ionizing radiation curable coating is applied to a transparent substrate and then irradiated with ionizing radiation such as ultraviolet rays, the coating layer becomes adhesive, so it can be used as an acrylic adhesive. it can.

As the light diffusing particles used in the light diffusing layer, either inorganic fine particles or organic fine particles can be used. The refractive index of the light diffusing particles is preferably selected as appropriate in the range of 1.30 to 2.40, and more preferably selected in the range of 1.40 to 1.65. If the refractive index of the light diffusing particles is in such a range, the absolute value of the difference in refractive index from the transparent resin can be set to a desired range, and a light diffusing layer having a desired haze value can be obtained. it can.

Examples of the inorganic fine particles include silica, alumina, rutile titanium dioxide, anatase titanium dioxide, zinc oxide, zinc sulfide, lead white, antimony oxides, zinc antimonate, lead titanate, potassium titanate, barium titanate, and oxidation. Zirconium, cerium oxide, hafnium oxide, tantalum pentoxide, niobium pentoxide, yttrium oxide, chromium oxide, tin oxide,
Conventionally known materials such as molybdenum oxide, indium tin oxide, antimony-doped tin oxide, calcium carbonate, talc, oxide glass such as silicate glass, phosphate glass, borate glass, and diamond can be used as appropriate. .

Examples of the organic fine particles include acrylic polymers, acrylonitrile polymers, styrene-acrylic copolymers, vinyl acetate-acrylic copolymers, vinyl acetate polymers, ethylene-
Vinyl acetate copolymer, chlorinated polyolefin polymer, multi-component copolymer such as ethylene-vinyl acetate-acrylic, SBR, NBR, MBR, carboxylated SBR, carboxylated NB
R, carboxylated MBR, polyvinyl chloride resin, polyvinylidene chloride resin, polyester resin, polyolefin resin, polyurethane resin, polymethacrylate resin, polytetrafluoroethylene resin, polymethyl methacrylate resin, polycarbonate Conventionally known ones such as resin, polyvinyl acetal resin, rosin ester resin, episulfide resin, epoxy resin, silicone resin, silicone-acrylic resin, melamine resin can be used as appropriate.

The shape of the light diffusing particles may be any shape such as a spherical shape, a flat shape, an indeterminate shape, a star shape, and a confetti shape. Moreover, hollow particles and core-shell particles may be used. The light diffusing particles may be used alone or in combination of two or more.

The average particle diameter of the light diffusing particles is preferably 0.2 to 10 μm, more preferably 1 to 1.
5 μm. If the average particle size is less than 0.2 μm, the light diffusion performance is low, the visibility of the projected image may be inferior, the cost increases due to excessive addition of light diffusing particles, and the physical properties of the light diffusing layer decrease. There is a fear. On the other hand, if the average particle diameter exceeds 10 μm, the visible light transmittance may be lowered, or the contrast may be lowered due to glare.

The content of the light diffusing fine particles in the light diffusing layer includes the refractive index of the transparent resin and light diffusing particles used, the size of the light diffusing particles, the thickness of the light diffusing layer, the dispersion state of the light diffusing particles, and the like. However, although it cannot be generally stated, it is preferably 0.3 to 20 parts by mass, more preferably 1 to 10 parts by mass with respect to 100 parts by mass of the transparent resin. If the content is less than 0.3 part by mass, the transparent heat shielding member having the transparent screen function may have a haze value of less than 5%. As a result, the light diffusion performance becomes insufficient, and the projector There is a possibility that the visibility of the projected image is poor. If the content exceeds 20 parts by mass, the haze value may exceed 35%. As a result, the background visibility may decrease or the visible light transmittance may decrease. By setting the blending amount of the light diffusing particles in the above range, a light diffusing layer having excellent light diffusing performance can be obtained.

The thickness of the light diffusing layer is appropriately determined depending on the size and content of the light diffusing particles to be used, the refractive index of the transparent resin or the light diffusing particles, and the like by adjusting the thickness. The haze value of the transparent heat shielding member having a transparent screen function can be set to a desired range. The thickness of the light diffusion layer is preferably 5 to 200 μm, more preferably 10 to 100 μm. If the thickness is less than 5 μm, the haze value may be less than 5%. As a result, the light diffusion performance may be insufficient, and the visibility of the projected image of the projector may be deteriorated. Thickness is 20
If it exceeds 0 μm, there may be a problem in handling and workability, or the haze value may exceed 35%. As a result, the background visibility may be lowered or the visible light transmittance may be lowered.

In addition, when using the above-mentioned adhesive as the transparent resin, the thickness of the light diffusion layer is:
10-150 micrometers is preferable. There exists a possibility that the adhesive force with respect to the transparent substrate used as a to-be-adhered body may fall that thickness is less than 10 micrometers. When the thickness exceeds 150 μm, the raw material of the transparent heat-shielding member having the transparent screen function is finally wound up, and when the end is slit, there is a risk that the end surface of the slit may become sticky and dust or the like may be attached. There is a risk of defects in workability.

The light diffusing layer may be formed directly on the transparent substrate or via an easy-adhesive layer or an adhesive layer, or directly on the infrared reflective layer or via a primer layer or the like. It may be formed.

The method for forming the light diffusion layer is not particularly limited, but the transparent resin is ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, methyl isobutyl ketone,
Coating and drying the transparent base material side or infrared reflective layer side of the transparent base material on which the infrared reflective layer is formed with a paint in which the above light diffusing particles are dispersed in a solution dissolved in an organic solvent such as cyclohexanone, toluene, xylene, etc. It is preferable to form by the method of providing.

In the case of using a pressure-sensitive adhesive as the transparent resin, the pressure-sensitive adhesive solution in which light diffusing particles are dispersed was applied and dried on the transparent substrate side or the infrared reflection layer side of the transparent substrate on which the infrared reflection layer was formed. Later, a method of laminating a release film on the pressure-sensitive adhesive layer, or after coating and drying a pressure-sensitive adhesive solution in which light diffusing particles are dispersed on the release film, The light diffusing layer can be formed by a method in which the transparent substrate side or the infrared reflecting layer side of the transparent substrate on which the infrared reflecting layer is formed is bonded and provided. Furthermore, in a transparent resin such as polyolefin or polyethylene terephthalate, the light diffusing particles are heat-melt kneaded and extruded to form a film on the transparent substrate side or infrared reflection layer side of the transparent substrate on which the infrared reflection layer is formed. The light diffusing layer can also be formed by a method of bonding by a transparent adhesive.

The light diffusing particles can be dispersed in the transparent resin using various mixing / stirring devices such as a disper, an agitator, a ball mill, an attritor, and a sand mill, and a dispersing device. Moreover, you may add and disperse | distribute the dispersing agent with respect to a light diffusable particle as needed. The coating material in which the light diffusing particles are dispersed is preferably defoamed before coating in order to prevent bubbles from remaining in the light diffusion layer after coating and drying as much as possible.

Coating of the paint in which the light diffusing particles are dispersed can be performed using a coater such as a die coater, a comma coater, a reverse coater, a dam coater, a doctor bar coater, a gravure coater, a micro gravure coater, or a roll coater.

The light diffusion layer is cured by performing crosslinking suitable for the functional group of the transparent resin to be used, for example, crosslinking by heat with addition of a crosslinking agent having a polyfunctional group, crosslinking by irradiation with ionizing radiation, and the like. May be.

[Protective layer]
The transparent heat-shielding member having the above-mentioned transparent screen function is a state in which at least an ionizing radiation curable resin or a thermosetting resin is applied to the outermost surface layer (air side) in a state where it is used after being attached to a transparent substrate with an adhesive or an adhesive. It is preferable to form the protective layer containing as a hard-coat layer. From the viewpoint of improving scratch resistance, it is more preferable to form a protective layer containing at least an ionizing radiation curable resin as a hard coat layer. Thereby, it is possible to prevent the surface from being damaged when a transparent heat-shielding member having a transparent screen function is attached to a transparent substrate or cleaned.

As the protective layer, a transparent ionizing radiation curable resin containing at least an ionizing radiation curable resin monomer, an ionizing radiation curable resin oligomer, or a mixture thereof can be used. The protective layer made of the ionizing radiation curable resin is formed by irradiating with ionizing radiation and curing.

As the ionizing radiation curable resin monomer, for example, a polyfunctional acrylate monomer having two or more unsaturated groups can be used. Specifically, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, 1,4-cyclohexanediacrylate, pentaerythritol tetra (meth) acrylate, pentaerythritol tri (meth) ) Acrylate,
Trimethylolpropane tri (meth) acrylate, trimethylolethanetri (meth)
Acrylate, acrylate such as dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,2,3-cyclohexanetrimethacrylate; pentaerythritol triacrylate hexamethylene diisocyanate urethane Polyurethane polyacrylates such as prepolymers; esters produced from polyhydric alcohols such as polyester polyacrylates and (meth) acrylic acid; 1,4-divinylbenzene, 4-vinylbenzoic acid-2-acryloylethyl ester, 1 Vinylbenzene such as 1,4-divinylcyclohexanone and derivatives thereof.

In addition, in order to further improve the adhesion between the ionizing radiation curable resin and the underlayer such as an infrared reflecting layer, the ionizing radiation curable resin monomer is provided with a polar group such as a phosphate group, a sulfonic acid group, and an amide group. You may add and use the (meth) acrylic acid derivative which has.

Furthermore, in order to further improve the wettability during coating of the ionizing radiation curable resin solution to the undercoat layer such as an infrared reflective layer, the ionizing radiation curable resin solution may be fluorine-based, silicone-based, acrylic-based, etc. These leveling agents may be added and used.

As said ionizing radiation curable resin oligomer, polyfunctional acrylate oligomers, such as urethane type, an epoxy type, and a polyester type, etc. can be used, for example. Among these, urethane polyfunctional acrylate oligomers are preferable because they easily balance the hardness and flexibility of the protective layer to be formed. The urethane polyfunctional acrylate oligomer can be obtained, for example, by reacting a urethane acrylate having an acrylate polymer in the main chain skeleton and having a reactive acryloyl group at the terminal.

In addition, in order to further improve the adhesion to an underlayer such as an infrared reflecting layer, the ionizing radiation curable resin oligomer has a (meth) acrylic acid derivative having a polar group such as a phosphoric acid group, a sulfonic acid group, and an amide group. May be used.

Furthermore, in order to further improve the wettability during coating of the ionizing radiation curable resin solution to the undercoat layer such as an infrared reflective layer, the ionizing radiation curable resin solution may be fluorine-based, silicone-based, acrylic-based, etc. These leveling agents may be added and used.

A commercial item can also be used as said polyfunctional acrylate oligomer. For example, “BPZA-66”, “BPZA-100” (trade name) manufactured by Kyoeisha Chemical Co., Ltd. “Acryt 8KX-012C”, “8KX-077” (trade name) manufactured by Taisei Fine Chemical Co., Ltd., manufactured by Hitachi Chemical Co., Ltd. "Hitaroid 7975", "Hitaroid 7975D", "Hitaroid 7988" (trade name), "ACA-200M", "ACA-230AA", "ACA-Z250", "ACA-Z251" manufactured by Daicel Ornex Co., Ltd. “ACA-Z300”, “ACA-Z320” (trade name) and the like can be used.

The weight average molecular weight of the ionizing radiation curable resin oligomer is not particularly limited. However, in the case of coating and forming as a protective layer on a primer layer made of a modified polyolefin resin described later, 10,000 to 100, 000 is preferred. By setting the weight average molecular weight within the above range, the coating property of the coating solution for forming the protective layer used for forming the protective layer is further improved, and the scratch resistance of the formed protective layer is sufficient. can do. In the present invention, the weight average molecular weight of the oligomer is measured by a GPC (gel permeation chromatography) method.

When the weight average molecular weight is less than 10,000, when the protective layer-forming coating solution is applied onto a primer layer made of a modified polyolefin resin described later, the protective layer-forming coating solution becomes the modified polyolefin. In some cases, the primer layer made of resin does not spread uniformly and repels. In addition, when the weight average molecular weight exceeds 100,000, the number of unsaturated bond groups serving as cross-linking reaction points per molecular weight decreases. Therefore, when cured by ionizing radiation, the cross-linking density of the coating does not improve, and protection is achieved. The scratch resistance of the layer may be insufficient.

Moreover, as the protective layer, a transparent resin containing at least a thermosetting resin can be used. Examples of the thermosetting resin include silicone resins, phenol resins, urea resins, diallyl phthalate resins, melamine resins, unsaturated polyester resins, polyurethane resins, and epoxy resins. . The protective layer made of the thermosetting resin is formed by heating and curing the thermosetting resin precursor.

In order to improve the hardness of the formed protective layer, the thermosetting resin precursor is preferably a silicone resin precursor, and among the silicone resin precursors, a thermosetting resin precursor made of an alkoxysilane compound. Is most preferred.

Examples of the thermosetting resin precursor made of the alkoxysilane compound include “KP-86” (trade name) manufactured by Shin-Etsu Silicone, “SHC-900” and “Tosguard 510” manufactured by Momentive Performance Materials Japan. (Product name).

The protective layer is formed directly on the transparent base material, the infrared reflective layer, or the light diffusion layer, or via a primer layer, depending on the configuration of the infrared reflective layer and the light diffusion layer formed on the transparent base material. Can be formed. Among these, in order to set the vertical emissivity of the transparent heat-shielding member having the transparent screen function to 0.50 or less and to provide heat insulation, the protective layer is formed directly on the infrared reflective layer or a primer layer. It is preferable to form via. In addition, when resin with hard coat property is used for the light diffusion layer, the light diffusion layer itself can be used as a protective layer.

Although the thickness of the said protective layer is not specifically limited, It is preferable to adjust suitably in the range of 0.05-5 micrometers. If the thickness is less than 0.05 μm, the scratch resistance of the protective layer may be insufficient. When the thickness exceeds 5 μm, the transparent ionizing radiation curable resin or thermosetting resin forming the protective layer contains many C═O groups, C—O groups, and aromatic groups due to its chemical structure. Infrared vibration absorption is likely to occur in the far-infrared region with a wavelength of 5 to 25.2 μm, and the protective layer absorbs the light directly irradiated on it and the light reflected by the infrared reflecting layer, thereby increasing the emissivity. For example, even if the protective layer is formed directly on the infrared reflecting layer or via the primer layer, the vertical emissivity of the transparent heat-shielding member having the transparent screen function exceeds 0.50. , There is a risk that sufficient heat insulating properties may not be obtained.

Furthermore, it is more preferable that the thickness of the protective layer is appropriately adjusted in the range of 0.05 to 2 μm. By setting the thickness within this range, when the protective layer is formed directly on the infrared reflective layer or via the primer layer, the vertical emissivity of the transparent heat shield member having the transparent screen function is set to 0. It can be made into 30 or less, and higher heat insulation can be provided.

A filler such as an organic substance or an inorganic substance can be appropriately added to the protective layer as an antiblocking agent or a scratch resistance improver so that absorption of light in the infrared region wavelength does not increase.

As said filler, an inorganic filler and an organic filler can be used, for example in the range which does not affect optical characteristics, such as a total light transmittance and a haze value. Examples of the inorganic filler include silica, talc, barium sulfate, calcium carbonate, aluminum hydroxide, aluminum oxide, magnesium hydroxide, magnesium oxide, zinc oxide, titanium oxide, zirconium oxide, mica, and zinc stearate. . Examples of the organic filler include silicone resin fillers, acrylic resin fillers, styrene resin fillers, fluororesin fillers, and polybutadiene resin fillers.

These fillers may be used individually by 1 type, and may be used in combination of 2 or more type. The average particle diameter (number average diameter) of the filler is not particularly limited as long as it can impart anti-blocking properties or scratch resistance and does not affect the properties and appearance of the transparent heat-shielding member. The thickness of the protective layer is preferably smaller.

The method for forming the protective layer is not particularly limited, but a solution obtained by dissolving a transparent resin containing the ionizing radiation curable resin or the thermosetting resin in an appropriately selected organic solvent, a microgravure coater, Gravure coater, die coater, reverse coater,
Using a coater such as a roll coater, it can be formed by a method of coating and drying directly on any of a transparent substrate, an infrared reflection layer, and a light diffusion layer, or via a primer layer. Crosslinking and curing of the protective layer can be carried out by irradiating with ionizing radiation or applying thermal energy after drying the organic solvent.

[Primer layer]
As the primer layer, a transparent resin such as a polyester resin, a polyurethane resin, a synthetic rubber resin, an acrylate resin, a polyolefin resin modified with an acid, an acid anhydride, or a hydroxyl group can be used. The primer layer used when forming the layer on the infrared reflective layer is preferably a polyolefin resin modified with an acid, an acid anhydride or a hydroxyl group. Polyolefin resin modified with acid, acid anhydride, or hydroxyl group interacts with both the metal oxide layer or metal nitride layer of the infrared reflecting layer and the protective layer containing ionizing radiation curable resin or thermosetting resin. Is surprisingly strong, and therefore better adhesion can be obtained between the protective layer and the infrared reflective layer. Furthermore, the polyolefin resin modified with an acid anhydride or a hydroxyl group is a polyolefin whose main skeleton is a C═O group, a C—O group,
Since there are not so many aromatic groups, infrared vibration absorption is unlikely to occur in the far-infrared region with a wavelength of 5 to 25.2 μm, and an increase in vertical emissivity and heat transmissivity can be suppressed. It is hard to be disturbed.

The polyolefin resin that serves as the skeleton of the polyolefin resin modified with the acid, acid anhydride, or hydroxyl group is not particularly limited, but polypropylene and polypropylene-α-olefin copolymers are preferably used. Examples of the α-olefin of the polypropylene-α-olefin copolymer include ethylene, 1-butene, 1-heptene, 1-octene, 4-methyl-1-pentene, and the like. Several types can be used. The ratio of polypropylene in the polypropylene-α-olefin copolymer is not particularly limited, but from the viewpoint of solubility in an organic solvent, 50 mol% or more 9
It is preferably 0 mol% or less.

The modified polyolefin resin having an acid group is not particularly limited,
For example, the polyolefin resin may be acid-modified by graft copolymerization with at least one of α, β-unsaturated carboxylic acid and acid anhydride thereof. The α, β-unsaturated carboxylic acid and acid anhydride are not particularly limited. For example, maleic acid, itaconic acid, citraconic acid, fumaric acid, aconitic acid, crotonic acid, isocrotonic acid, acrylic acid, etc. The thing is mentioned, These may be used individually or may use 2 or more together. Among these, from the viewpoint of versatility, it is preferable to modify at least one of maleic anhydride and itaconic anhydride by graft copolymerization with the polyolefin resin.

The amount of graft copolymerization of the α, β-unsaturated carboxylic acid or its acid anhydride to the polyolefin resin is preferably in the range of 0.2 to 30% by mass, more preferably in the range of 1.0 to 10.0% by mass. preferable. When the amount of the graft copolymer is less than 0.2% by mass, the solubility in an organic solvent is lowered, the stability as a primer layer forming coating solution may be deteriorated, and the adhesion to an infrared reflective layer may be reduced. In contrast, if it exceeds 30% by mass, the absorption in the infrared region wavelength starts to increase, and the vertical emissivity and the thermal conductivity may increase.

The modified polyolefin resin having an acid group can be produced by a known method such as a melting method or a solution method.

Moreover, the modified polyolefin resin having an acid group further improves solubility in polar solvents, adhesion to a hard coat agent, and compatibility by further adding a (meth) acrylic acid monomer and modifying the acrylic group. You can also Specifically, after reacting an unsaturated bond-containing compound having a functional group (hydroxyl group or glycidyl group) that reacts with the acid-modified portion of the modified polyolefin resin having an acid group, after introducing a double bond, It can be obtained by graft copolymerization of a (meth) acrylic acid monomer.

Examples of the unsaturated bond-containing compound having a functional group include 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, polypropylene glycol acrylate, 2-hydroxyethyl methacrylate, and methacrylic acid. 2
It is preferable to use -hydroxypropyl, 4-hydroxybutyl methacrylate, polypropylene glycol methacrylate, glycidyl acrylate, glycidyl methacrylate, or the like. These unsaturated bond-containing compounds are 1 for the modified polyolefin resin having an acid group.
It is preferable to use about 0-90 mass%.

As described above, the (meth) acrylic acid monomer to be graft copolymerized after introducing a double bond into the modified polyolefin resin having an acid group includes (meth) acrylic acid and (meth)
An acrylic ester is mentioned. Examples of the (meth) acrylic acid include at least one of acrylic acid and methacrylic acid. As the above (meth) acrylic acid ester,
For example, methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, isobutyl acrylate, t-butyl acrylate, 2-ethylhexyl acrylate,
Lauryl acrylate, stearyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, glycidyl acrylate, cyclohexyl acrylate, polypropylene glycol acrylate, methyl methacrylate, ethyl methacrylate, Propyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, t-butyl methacrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, stearyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, methacrylic acid Examples include 4-hydroxybutyl, glycidyl methacrylate, cyclohexyl methacrylate, and polypropylene glycol methacrylate. These (meth) acrylic acid monomers can be used alone or in admixture of two or more.

In addition, the modified polyolefin resin having a hydroxyl group is obtained by introducing a double bond into a modified polyolefin resin having an acid group, and then 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate, methacrylic acid. It can be obtained by graft copolymerization of a hydroxyl group-containing (meth) acrylic acid monomer such as 2-hydroxyethyl, 2-hydroxypropyl methacrylate, 4-hydroxybutyl methacrylate.

The weight average molecular weight measured by GPC method of the modified polyolefin resin is 10,000 to
A range of 200,000 is preferred. When the weight average molecular weight is less than 10,000, the strength as a primer layer may be inferior, and the weight average molecular weight is 200.
If it is greater than 1,000, workability may decrease due to an increase in the viscosity of the primer layer-forming coating solution.

For the modified polyolefin resin having an acid group, commercially available products can be used. For example, “Unistall P902” (trade name) manufactured by Mitsui Chemicals, “Hardlen” (trade name) manufactured by Toyobo, Nippon Paper Industries Co., Ltd. "Auroren" (trade name) manufactured by Chemical, "Surflen" (trade name) manufactured by Mitsubishi Chemical, "Sumifit" (trade name) manufactured by Sumika Chemtex, "Zyxen" manufactured by Sumitomo Seika Co., Ltd. (Brand name) etc. are mentioned. Commercially available products can also be used for the modified polyolefin resin having a hydroxyl group, such as “Unistor P901” (trade name) manufactured by Mitsui Chemicals, “Polytail” (trade name) manufactured by Mitsubishi Chemical. It is done.

The thickness of the polyolefin resin modified with the acid, acid anhydride or hydroxyl group as a primer layer is preferably 0.05 μm to 10 μm, more preferably 0.05 μm.
~ 5 μm. When the thickness is less than 0.05 μm, the adhesion between the infrared reflecting layer and the protective layer may be insufficient. If the thickness exceeds 10 μm, the visible light transmittance may decrease depending on the type and amount of the modified polyolefin resin used, and the wavelength of 5 to 25 may be reduced.
. Absorption in the far-infrared region of 2 μm increases, and as a result, the vertical emissivity and the heat transmissivity may increase.

A filler such as an organic substance or an inorganic substance can be appropriately added to the primer layer as an antiblocking agent to such an extent that absorption of light in the infrared region wavelength does not increase.

As said filler, an inorganic filler and an organic filler can be used, for example in the range which does not affect optical characteristics, such as a total light transmittance and a haze value. Examples of the inorganic filler include silica, talc, barium sulfate, calcium carbonate, aluminum hydroxide, aluminum oxide, magnesium hydroxide, magnesium oxide, zinc oxide, titanium oxide, zirconium oxide, mica, and zinc stearate. . Examples of the organic filler include silicone resin fillers, acrylic resin fillers, styrene resin fillers, fluororesin fillers, and polybutadiene resin fillers.

These fillers may be used individually by 1 type, and may be used in combination of 2 or more type. The average particle diameter (number average diameter) of the filler is not particularly limited as long as it can impart anti-blocking properties and does not affect the properties and appearance of the transparent heat-shielding member. The thickness is preferably about 0.5 to 2.0 times the thickness of the film.

The method for forming the primer layer is not particularly limited, but the polyester resin, polyurethane resin, synthetic rubber resin, acrylic ester resin, polyolefin modified with acid, acid anhydride or hydroxyl group. Transparent resin such as resin A solution dissolved in water or an organic solvent selected as appropriate, using a coater such as a micro gravure coater, gravure coater, die coater, reverse coater, roll coater, transparent substrate, infrared reflective layer, or It can form by the method of apply | coating and drying on either of a light-diffusion layer.

[Transparent substrate]
As a transparent substrate for sticking the transparent heat shielding member having the transparent screen function of the present invention with a transparent pressure-sensitive adhesive or adhesive, or electrostatically adsorbing it, particularly if it has optical transparency It is not limited, The plate-shaped thing etc. which consist of glass or a plastics can be used conveniently. The type of glass is not particularly limited, but for example,
Silicate glass, alkali silicate glass, soda lime glass, potash lime glass, lead glass,
Silicate glass such as barium glass and borosilicate glass is preferred. Although it is not limited as a kind of plastic, For example, polyacrylic ester resin, polycarbonate resin, polyvinyl chloride resin, polyarylate resin, polyethylene resin,
Polypropylene resins and polyester resins are preferred.

[Adhesive layer]
The transparent heat-shielding member having the transparent screen function of the present invention can be easily bonded to a transparent substrate such as a window glass if an adhesive layer or the like is formed on the opposite surface on which the protective layer is formed. . As the material for the pressure-sensitive adhesive layer, a material having a high visible light transmittance and a small refractive index difference from the transparent substrate is suitably used. For example, acrylic resins, silicone resins, polyester resins, epoxy resins, polyurethane resins, and the like can be mentioned. In particular, acrylic resins have high optical transparency, wettability and adhesive strength. It is more suitably used because of its good balance, high reliability and many achievements, and relatively low cost. As said acrylic adhesive, the same adhesive as what can be used for the light-diffusion layer mentioned above can be used by the same prescription.

The pressure-sensitive adhesive layer preferably contains an ultraviolet absorber in order to suppress deterioration of the transparent heat shielding member having a transparent screen function due to ultraviolet rays such as sunlight. Moreover, it is preferable that the said adhesive layer is equipped with the release film on the adhesive layer until it sticks and uses the transparent heat-shielding member provided with the transparent screen function on the transparent substrate.

As for the thickness of the said adhesive, 10-150 micrometers is preferable. There exists a possibility that the adhesive force with respect to the transparent substrate used as a to-be-adhered body may fall that thickness is less than 10 micrometers. When the thickness exceeds 150 μm, the raw material of the transparent heat-shielding member having the transparent screen function is finally wound up, and when the end is slit, there is a risk that the end surface of the slit may become sticky and dust or the like may be attached. There is a risk of defects in workability.

A method for forming the pressure-sensitive adhesive layer on the transparent heat-shielding member having a transparent screen function is not particularly limited, but a solution obtained by dissolving the resin for forming the pressure-sensitive adhesive layer in an appropriately selected organic solvent is used. Using a coater such as a die coater, comma coater, reverse coater, dam coater, doctor bar coater, gravure coater, micro gravure coater, roll coater, etc. It is preferable to form the exposed surface by a method of bonding the opposite surface on which the protective layer of the transparent heat shield member having a transparent screen function is formed.

Hereinafter, the present invention will be described in detail based on examples. However, the present invention is not limited to the following examples. In addition, unless otherwise indicated, in the following, “part” means “part by mass”. Examples of the present application are Examples 1 to 9, Example 11, and Examples 13 to 14.

[Example 1]
<Formation of infrared reflective layer>
First, as a transparent substrate, a polyethylene terephthalate (PET) film “A4300” (trade name, thickness: 50 μm) manufactured by Toyobo Co., Ltd., whose both surfaces were subjected to easy adhesion treatment was prepared. Next, on one side of the PET film, an indium tin oxide (ITO) layer having a thickness of 29 nm, a thickness of 1
A three-layer infrared reflecting layer composed of a 3 nm silver (Ag) layer and a 29 nm thick indium tin oxide (ITO) layer was formed by sputtering.

<Formation of primer layer>
10 parts of modified polyolefin resin solution “Hardlen NS-2002” (trade name, acid-modified type, solid content concentration 20 mass%) manufactured by Toyobo Co., Ltd. and methylcyclohexane 8 as a diluent solvent
0 parts and 20 parts of methyl isobutyl ketone were blended with a disper to prepare a primer layer forming coating solution. Next, the coating solution for forming the primer layer is coated and dried on the infrared reflective layer using a micro gravure coater so as to have a film thickness of 0.1 μm after drying. A primer layer was formed on top.

<Formation of protective layer>
Kyoeisha Chemical Co., Ltd. ionizing radiation curable resin oligomer solution “BPZA-66” (trade name,
A solid content concentration of 80% by weight, a weight average molecular weight of 20,000), 125 parts of a photopolymerization initiator “Irgacure 819” (trade name) manufactured by BASF, and 375 parts of methyl isobutyl ketone were blended in a disper. A coating solution for forming a protective layer was prepared. Next, the coating liquid for forming the protective layer is dried on the primer layer using a micro gravure coater with a film thickness of 1.4 after drying.
The hard coat protective layer was formed on the primer layer by coating and drying to a thickness of μm and irradiating with UV light of 300 mJ / cm ² with a high pressure mercury lamp.

As described above, an infrared reflective film having a protective layer on the infrared reflective layer was produced.

<Formation of light diffusion adhesive layer>
First, as a release film, a PET film “NS-38 + A” (trade name, thickness: 38 μm) manufactured by Nakamoto Pax Co., Ltd., one side of which was treated with silicone was prepared. Momentive Performance Materials Japan, Inc. with respect to 100 parts of acrylic adhesive solution “SK Dyne 2094” (trade name, solid content: 25 mass%, refractive index: 1.49) manufactured by Soken Chemical Co., Ltd. Amorphous silicone resin fine particles “TOSPEARL240” (trade name, average particle diameter: 4.0 μm, refractive index: 1.42) 0.88 parts [3.5 parts for 100 parts of adhesive resin]
, 1.25 parts of an ultraviolet absorber (benzophenone) manufactured by Wako Pure Chemical Industries, Ltd. and 0.27 parts of a crosslinking agent “E-AX” (trade name, solid content: 5%) manufactured by Soken Chemical Co., Ltd. After being dispersed and blended with, defoaming was performed to prepare a coating solution for forming a light diffusion pressure-sensitive adhesive layer.

Next, the light-diffusing adhesive layer-forming coating solution is applied onto the silicone-treated surface of the release film using a die coater so that the thickness after drying is 25 μm. By drying, a light diffusion pressure-sensitive adhesive layer was formed. Further, the surface of the infrared reflective film having the protective layer on which the protective layer is not formed is bonded to the exposed surface of the light diffusion pressure-sensitive adhesive layer, and the light diffusion pressure-sensitive adhesive layer is formed on one side of the PET film substrate. Infrared reflective layer on one side,
An infrared reflective film (transparent heat shielding member) on which a primer layer and a protective layer were formed was produced.

<Lamination with glass substrate>
First, a float glass (manufactured by Nippon Sheet Glass Co., Ltd.) having a thickness of 3 mm was prepared as a glass substrate. Next, a light diffusion pressure-sensitive adhesive layer of an infrared reflection film (transparent heat shielding member) in which a light diffusion pressure-sensitive adhesive layer is formed on one side of the PET film substrate and an infrared reflection layer, a primer layer and a protective layer are formed on the other side. The release film was peeled off, and the light diffusion pressure-sensitive adhesive layer side was bonded to the float glass.

[Example 2]
Except that the thickness of the silver (Ag) layer in the infrared reflective layer of Example 1 was 10 nm, the light diffusion adhesive layer was applied to one side of the PET film substrate and the infrared ray was applied to the other side in the same manner as Example 1. An infrared reflective film (transparent heat-shielding member) on which a reflective layer, a primer layer and a protective layer were formed was prepared and bonded to a glass substrate.

[Example 3]
Except that the thickness of the silver (Ag) layer in the infrared reflective layer of Example 1 was set to 15 nm, a light diffusion adhesive layer was formed on one side of the PET film substrate, and an infrared ray was applied on the other side, similarly to Example 1. An infrared reflective film (transparent heat-shielding member) on which a reflective layer, a primer layer and a protective layer were formed was prepared and bonded to a glass substrate.

[Example 4]
The infrared reflective layer of Example 1 was formed using an aluminum nitride (ALN) layer having a thickness of 30 nm and a thickness of 18 n.
A light diffusing adhesive is applied to one side of a PET film substrate in the same manner as in Example 1 except that an infrared reflective layer having a three-layer structure comprising an m silver (Ag) layer and an aluminum nitride (ALN) layer having a thickness of 30 nm is used. An infrared reflective film (transparent heat-shielding member) having an agent layer and an infrared reflective layer, a primer layer, and a protective layer formed on the other surface was prepared and bonded to a glass substrate.

[Example 5]
Amorphous silicone resin fine particles “TOSPEARL2” in the light diffusion adhesive layer of Example 1
PET film in the same manner as in Example 1 except that the addition amount of 40 ″ (trade name, average particle size: 4.0 μm) was 0.25 part [1.0 part with respect to 100 parts of the adhesive resin]. An infrared reflective film (transparent heat-shielding member) having a light diffusion pressure-sensitive adhesive layer on one side and an infrared reflective layer, primer layer and protective layer on the other side was prepared and bonded to a glass substrate.

[Example 6]
Amorphous silicone resin fine particles “TOSPEARL2” in the light diffusion adhesive layer of Example 1
PET film in the same manner as in Example 1 except that the addition amount of 40 ″ (trade name, average particle size: 4.0 μm) was 1.13 parts [4.5 parts with respect to 100 parts of the adhesive resin]. An infrared reflective film (transparent heat-shielding member) having a light diffusion pressure-sensitive adhesive layer on one side and an infrared reflective layer, primer layer and protective layer on the other side was prepared and bonded to a glass substrate.

[Example 7]
Except that the thickness of the protective layer of Example 1 was 0.5 μm, the light diffusing pressure-sensitive adhesive layer was formed on one side of the PET film substrate, the infrared reflective layer, and the primer layer on the other side, as in Example 1. And the infrared reflective film (transparent heat-shielding member) in which the protective layer was formed was produced, and it affixed on the glass substrate.

[Example 8]
Except that the thickness of the protective layer of Example 1 was 3.5 μm, the light diffusion adhesive layer was formed on one side of the PET film substrate, the infrared reflective layer, and the primer layer on the other side in the same manner as Example 1. And the infrared reflective film (transparent heat-shielding member) in which the protective layer was formed was produced, and it affixed on the glass substrate.

[Example 9]
Except that the thickness of the protective layer of Example 1 was 5.5 μm, the light diffusion adhesive layer was formed on one side of the PET film substrate, the infrared reflective layer, and the primer layer on the other side in the same manner as Example 1. And the infrared reflective film (transparent heat-shielding member) in which the protective layer was formed was produced, and it affixed on the glass substrate.

[Example 10]
<Formation of infrared reflective layer>
First, as a transparent substrate, a polyethylene terephthalate (PET) film “A4300” (trade name, thickness: 50 μm) manufactured by Toyobo Co., Ltd., whose both surfaces were subjected to easy adhesion treatment was prepared. Next, on one side of the PET film, an indium tin oxide (ITO) layer having a thickness of 29 nm, a thickness of 1
A three-layer infrared reflecting layer composed of a 3 nm silver (Ag) layer and a 29 nm thick indium tin oxide (ITO) layer was formed by sputtering.

<Formation of protective layer>
Kyoeisha Chemical Co., Ltd. ionizing radiation curable resin oligomer solution “BPZA-66” (trade name,
125 parts by weight of solid content 80 mass%, weight average molecular weight 20,000) and organosol “LA-OS26BK” (trade name, average particle diameter 0.7 μm, solid content) produced by Nissan Chemical Industries, Ltd. (Concentration 26 mass%) 1.92 parts [ionizing radiation curable resin oligomer 1
0.5 parts with respect to 00 parts], 3 parts of a photopolymerization initiator “Irgacure 819” (trade name) manufactured by BASF and 375 parts of methyl isobutyl ketone were blended in a disper, and a coating solution for forming a protective layer Was prepared. Next, the protective layer-forming coating solution is dried on the surface side of the PET film where the infrared reflective layer is not formed using a micro gravure coater.
The hard coat protective layer was formed by coating and drying the film so as to become and curing it by irradiating it with ultraviolet light having a light amount of 300 mJ / cm ² using a high-pressure mercury lamp.

As described above, an infrared reflective film (transparent heat shielding member) having a protective layer on the opposite side of the infrared reflective layer was produced.

<Formation of light diffusion adhesive layer>
First, as a release film, a PET film “NS-38 + A” (trade name, thickness: 38 μm) manufactured by Nakamoto Pax Co., Ltd., one side of which was treated with silicone was prepared. Momentive Performance Materials Japan, Inc. with respect to 100 parts of acrylic adhesive solution “SK Dyne 2094” (trade name, solid content: 25 mass%, refractive index: 1.49) manufactured by Soken Chemical Co., Ltd. Amorphous silicone resin fine particles “TOSPEARL240” (trade name, average particle diameter: 4.0 μm, refractive index: 1.42) 0.88 parts [3.5 parts for 100 parts of adhesive resin]
, 1.25 parts of an ultraviolet absorber (benzophenone) manufactured by Wako Pure Chemical Industries, Ltd. and 0.27 parts of a crosslinking agent “E-AX” (trade name, solid content: 5%) manufactured by Soken Chemical Co., Ltd. After being dispersed and blended with, defoaming was performed to prepare a coating solution for forming a light diffusion pressure-sensitive adhesive layer.

Next, the light-diffusing adhesive layer-forming coating solution is applied onto the silicone-treated surface of the release film using a die coater so that the thickness after drying is 25 μm. By drying, a light diffusion pressure-sensitive adhesive layer was formed. Further, the surface side on which the infrared reflecting layer of the infrared reflecting film having the protective layer is formed is bonded to the exposed surface of the light diffusing pressure-sensitive adhesive layer, and the light diffusing pressure-sensitive adhesive layer and the infrared ray are formed on one side of the PET film substrate. An infrared reflective film (transparent heat shielding member) having a reflective layer and a protective layer formed on the other surface was produced.

<Lamination with glass substrate>
First, a float glass (manufactured by Nippon Sheet Glass Co., Ltd.) having a thickness of 3 mm was prepared as a glass substrate. Next, release of the light diffusion pressure-sensitive adhesive layer of the infrared reflection film (transparent heat shielding member) in which the light diffusion pressure-sensitive adhesive layer and the infrared reflection layer are formed on one side of the PET film substrate and the protective layer is formed on the other side. The film was peeled off, and the light diffusion pressure-sensitive adhesive layer side was bonded to the float glass.

[Example 11]
First, in the same manner as in Example 1, an infrared reflective film (transparent heat shielding member) having a protective layer on the infrared reflective layer was produced.

<Formation of light diffusion layer>
Acrylic resin “Dianar BR-90” (trade name, refractive index: 1.
49) 100 parts of amorphous silicone resin fine particles “TOSPEARL240” manufactured by Momentive Performance Materials Japan (trade name, average particle diameter of 4.0)
μm) 0.88 parts [3.5 parts with respect to 100 parts of acrylic resin], 1.25 parts of UV absorber (benzophenone) manufactured by Wako Pure Chemical Industries, Ltd., 75 parts of methyl ethyl ketone, and 75 parts of toluene were added, After being dispersed and blended with, defoaming was performed to prepare a coating solution for forming a light diffusion layer.

Next, the coating solution for forming the light diffusion layer is applied to the surface of the infrared reflective film having the protective layer on the infrared reflective layer, on which the protective layer is not formed, so that the thickness after drying is 25 μm. A light diffusing layer was formed by coating and drying using a tar.

<Formation of adhesive layer>
First, as a release film, a PET film “NS-38 + A” (trade name, thickness: 38 μm) manufactured by Nakamoto Pax Co., Ltd., one side of which was treated with silicone was prepared. In addition, an ultraviolet absorber manufactured by Wako Pure Chemical Industries, Ltd. with respect to 100 parts of an acrylic adhesive solution “SK Dyne 2094” (trade name, solid content: 25 mass%, refractive index: 1.49) manufactured by Soken Chemical Co., Ltd. (Benzophenone-based) 1.25 parts and 0.27 parts of a cross-linking agent “E-AX” (trade name, solid content: 5%) manufactured by Soken Chemical Co., Ltd. were added, dispersed and blended with a disper, and then defoamed. Thus, a coating solution for forming an adhesive layer was prepared.

Next, on the surface of the release film on the side of the PET film that has been treated with silicone, the pressure-sensitive adhesive layer-forming coating solution is applied and dried so that the thickness after drying is 25 μm.
An adhesive layer was formed. Further, the exposed surface of the pressure-sensitive adhesive layer is bonded to the surface side on which the light diffusing layer of the infrared reflective film having the protective layer is formed, and the pressure-sensitive adhesive layer and the light diffusing layer are already formed on one side of the PET film substrate. An infrared reflective film (transparent heat shielding member) having an infrared reflective layer, a primer layer, and a protective layer formed on one surface was produced.

<Lamination with glass substrate>
First, a float glass (manufactured by Nippon Sheet Glass Co., Ltd.) having a thickness of 3 mm was prepared as a glass substrate. Next, an infrared reflective film (transparent heat shielding member) in which an adhesive layer and a light diffusion layer are formed on one side of the PET film substrate, and an infrared reflective layer, a primer layer and a protective layer are formed on the other side
The release film of the pressure-sensitive adhesive layer was peeled off, and the pressure-sensitive adhesive layer side was bonded to the float glass.

[Example 12]
<Formation of infrared reflective layer>
First, as a transparent substrate, a polyethylene terephthalate (PET) film “A4300” (trade name, thickness: 50 μm) manufactured by Toyobo Co., Ltd., whose both surfaces were subjected to easy adhesion treatment was prepared. Next, on one side of the PET film, an indium tin oxide (ITO) layer having a thickness of 29 nm, a thickness of 1
A three-layer infrared reflecting layer composed of a 3 nm silver (Ag) layer and a 29 nm thick indium tin oxide (ITO) layer was formed by sputtering.

<Formation of light diffusion layer>
Acrylic resin “Dianar BR-90” (trade name, refractive index: 1.
49) 100 parts of amorphous silicone resin fine particles “TOSPEARL240” manufactured by Momentive Performance Materials Japan (trade name, average particle diameter of 4.0)
μm) 0.88 part [3.5 parts with respect to 100 parts of the adhesive resin], 1.25 parts of an ultraviolet absorber (benzophenone) manufactured by Wako Pure Chemical Industries, Ltd., 75 parts of methyl ethyl ketone, and 75 parts of toluene, After dispersing and blending with a disper, defoaming was performed to prepare a coating solution for forming a light diffusion layer.

Next, on the infrared reflection layer of the PET film on which the infrared reflection layer is formed, the light diffusion layer forming coating solution is applied using a die coater so that the thickness after drying is 25 μm, and dried. As a result, a light diffusion layer was formed.

<Formation of protective layer>
125 parts of ionizing radiation curable resin oligomer solution “BPZA-66” (trade name, solid concentration 80 mass%, weight average molecular weight 20,000) manufactured by Kyoeisha Chemical Co., Ltd. and porous spherical silica manufactured by Nissan Chemical Industries, Ltd. 1.92 parts of particle organosol “LA-OS26BK” (trade name, average particle diameter 0.7 μm, solid content concentration 26% by mass) [0.5 part with respect to 100 parts of ionizing radiation curable resin oligomer], BASF A photopolymerization initiator “Irgacure 819” (trade name) 3 parts and 375 parts of methyl isobutyl ketone were blended with a disper to prepare a coating solution for forming a protective layer. Next, the coating liquid for forming the protective layer is applied and dried on the light diffusion layer of the infrared reflective film having the light diffusion layer using a micro gravure coater so that the thickness after drying becomes 2 μm. A hard coat protective layer was formed on the light diffusion layer by irradiating with an ultraviolet ray of 300 mJ / cm ² with a high pressure mercury lamp and curing.

<Formation of adhesive layer>
First, as a release film, a PET film “NS-38 + A” (trade name, thickness: 38 μm) manufactured by Nakamoto Pax Co., Ltd., one side of which was treated with silicone was prepared. In addition, an ultraviolet absorber manufactured by Wako Pure Chemical Industries, Ltd. with respect to 100 parts of an acrylic adhesive solution “SK Dyne 2094” (trade name, solid content: 25 mass%, refractive index: 1.49) manufactured by Soken Chemical Co., Ltd. (Benzophenone series)
25 parts and 0.27 parts of a cross-linking agent “E-AX” (trade name, solid content: 5%) manufactured by Soken Chemical Co., Ltd. are added, dispersed and blended with a disper, and then defoamed to form an adhesive layer. A coating solution was prepared.

Next, on the surface of the release film on the side of the PET film that has been treated with silicone, the pressure-sensitive adhesive layer-forming coating solution is applied and dried so that the thickness after drying is 25 μm.
An adhesive layer was formed. Further, the surface of the infrared reflective film having the protective layer on which the infrared reflective layer is not formed is bonded to the exposed surface of the pressure sensitive adhesive layer, and the pressure sensitive adhesive layer is provided on the other side of the PET film substrate. An infrared reflective film (transparent heat-shielding member) having an infrared reflective layer, a light diffusion layer and a protective layer formed thereon was prepared.

<Lamination with glass substrate>
First, a float glass (manufactured by Nippon Sheet Glass Co., Ltd.) having a thickness of 3 mm was prepared as a glass substrate. Next, release of the pressure-sensitive adhesive layer of the infrared reflective film (transparent heat shielding member) in which the pressure-sensitive adhesive layer is formed on one side of the PET film base and the infrared reflective layer, the light diffusion layer and the protective layer are formed on the other side. The film was peeled off, and the pressure-sensitive adhesive layer side was bonded to the float glass.

[Example 13]
<Formation of infrared reflective layer>
First, as a transparent substrate, a polyethylene terephthalate (PET) film “A4300” (trade name, thickness: 50 μm) manufactured by Toyobo Co., Ltd., whose both surfaces were subjected to easy adhesion treatment was prepared. Next, on one side of the PET film, an indium tin oxide (ITO) layer having a thickness of 29 nm, a thickness of 1
A three-layer infrared reflecting layer composed of a 3 nm silver (Ag) layer and a 29 nm thick indium tin oxide (ITO) layer was formed by sputtering.

<Formation of protective layer>
Kyoeisha Chemical Co., Ltd. ionizing radiation curable resin oligomer solution “BPZA-66” (trade name,
125 parts of solid concentration 80% by weight, weight average molecular weight 20,000), 3 parts of phosphoric acid group-containing methacrylic acid derivative “light ester P-2M” (trade name) manufactured by Kyoeisha Chemical Co., Ltd., BASF
5 parts of a photopolymerization initiator “Irgacure 819” (trade name) manufactured by the company and 375 parts of methyl isobutyl ketone were blended with a disper to prepare a coating solution for forming a protective layer. Next, the coating liquid for forming the protective layer is applied on the infrared reflective layer using a micro gravure coater, dried to a thickness of 2.0 μm after drying, and then 300 mJ / cm using a high pressure mercury lamp. ^The hard coat protective layer was formed on the infrared reflective layer of the infrared reflective film by irradiating and curing the ultraviolet ray of ² light quantity.

As described above, an infrared reflective film (transparent heat shielding member) having a protective layer on the infrared reflective layer was produced.

<Formation of light diffusion adhesive layer>
First, as a release film, a PET film “NS-38 + A” (trade name, thickness: 38 μm) manufactured by Nakamoto Pax Co., Ltd., one side of which was treated with silicone was prepared. Momentive Performance Materials Japan, Inc. with respect to 100 parts of acrylic adhesive solution “SK Dyne 2094” (trade name, solid content: 25 mass%, refractive index: 1.49) manufactured by Soken Chemical Co., Ltd. Amorphous silicone resin fine particles “TOSPEARL240” (trade name, average particle diameter: 4.0 μm, refractive index: 1.42) 0.88 parts [3.5 parts for 100 parts of adhesive resin]
, 1.25 parts of an ultraviolet absorber (benzophenone) manufactured by Wako Pure Chemical Industries, Ltd. and 0.27 parts of a crosslinking agent “E-AX” (trade name, solid content: 5%) manufactured by Soken Chemical Co., Ltd. After being dispersed and blended with, defoaming was performed to prepare a coating solution for forming a light diffusion pressure-sensitive adhesive layer.

Next, the light-diffusing adhesive layer-forming coating solution is applied onto the silicone-treated surface of the release film using a die coater so that the thickness after drying is 25 μm. By drying, a light diffusion pressure-sensitive adhesive layer was formed. Further, the surface of the infrared reflective film having the protective layer on which the protective layer is not formed is bonded to the exposed surface of the light diffusion pressure-sensitive adhesive layer, and the light diffusion pressure-sensitive adhesive layer is formed on one side of the PET film substrate. An infrared reflective film (transparent heat shielding member) having an infrared reflective layer and a protective layer formed on one surface was produced.

<Lamination with glass substrate>
First, a float glass (manufactured by Nippon Sheet Glass Co., Ltd.) having a thickness of 3 mm was prepared as a glass substrate.
Next, release of the light diffusion pressure-sensitive adhesive layer of the infrared reflection film (transparent heat shielding member) in which the light diffusion pressure-sensitive adhesive layer is formed on one side of the PET film base and the infrared reflection layer and the protective layer are formed on the other side. The film was peeled off, and the light diffusion pressure-sensitive adhesive layer side was bonded to the float glass.

[Example 14]
Except that the protective layer of Example 1 was formed as described below, a light diffusing pressure-sensitive adhesive layer was formed on one side of the PET film substrate, and an infrared reflective layer, primer layer, and protective layer on the other side, except for the following. An infrared reflective film (transparent heat-shielding member) formed of was prepared and bonded to a glass substrate.

<Formation of protective layer>
First, as a transparent substrate, a polyethylene terephthalate (PET) film “A4300” (trade name, thickness: 50 μm) manufactured by Toyobo Co., Ltd., whose both surfaces were subjected to easy adhesion treatment was prepared. Next, a silicone hard coat agent solution “SHC-900” (trade name, solid content concentration of 30% by mass), a thermosetting resin manufactured by Momentive Performance Materials Japan, is prepared as a coating solution for forming a protective layer. did. Next, the coating liquid for forming the protective layer is coated on the primer layer using a micro gravure coater, dried to a film thickness of 1.4 μm after drying, and dried at 120 ° C. for 3 minutes. Thus, a hard coat protective layer was formed on the primer layer.

[Comparative Example 1]
<Formation of protective layer>
First, as a transparent substrate, a polyethylene terephthalate (PET) film “A4300” (trade name, thickness: 50 μm) manufactured by Toyobo Co., Ltd., whose both surfaces were subjected to easy adhesion treatment was prepared. Next, 125 parts of ionizing radiation curable resin oligomer solution “BPZA-66” (trade name, solid concentration 80 mass%, weight average molecular weight 20,000) manufactured by Kyoeisha Chemical Co., Ltd., and photopolymerization initiator manufactured by BASF 3 parts of “Irgacure 819” (trade name) and 375 parts of methyl isobutyl ketone were blended with a disper to prepare a coating solution for forming a protective layer. Next, the film thickness after drying the coating liquid for forming the protective layer on one side of the PET film using a micro gravure coater is 1.4.
The hard coat protective layer was formed by coating and drying to a thickness of μm and irradiating with a UV light of 300 mJ / cm ² with a high pressure mercury lamp to cure.

<Formation of light diffusion adhesive layer>
First, as a release film, a PET film “NS-38 + A” (trade name, thickness: 38 μm) manufactured by Nakamoto Pax Co., Ltd., one side of which was treated with silicone was prepared. In addition, 100 parts of acrylic adhesive solution “SK Dyne 2094” (trade name, solid content: 25 mass%, refractive index: 1.49) manufactured by Soken Chemical Co., Ltd., manufactured by Momentive Performance Materials Co., Ltd. Amorphous silicone resin fine particles “TOSPEARL240” (trade name, average particle size: 4.0 μm)
m, refractive index: 1.42) 0.88 parts [3.5 parts with respect to 100 parts of the adhesive resin], 1.25 parts of UV absorber (benzophenone) manufactured by Wako Pure Chemical Industries, Ltd., and Soken Chemical Co., Ltd. Cross-linking agent "EA
After adding 0.27 parts of X ″ (trade name, solid content: 5%) and dispersing and blending with a disper, defoaming was performed to prepare a coating solution for forming a light diffusion pressure-sensitive adhesive layer.

Next, by applying and drying the light diffusion pressure-sensitive adhesive layer forming coating solution on the surface of the release film on the silicone-treated side of the PET film so that the thickness after drying is 25 μm. A light diffusion adhesive layer was formed. Further, the surface of the PET film having the protective layer on which the protective layer is not formed is bonded to the exposed surface of the light diffusing pressure-sensitive adhesive layer, and the light diffusing pressure-sensitive adhesive layer is formed on one side of the PET film substrate. A transparent screen film having a protective layer formed on the surface was prepared.

<Lamination with glass substrate>
First, a float glass (manufactured by Nippon Sheet Glass Co., Ltd.) having a thickness of 3 mm was prepared as a glass substrate. Next, the release film of the light diffusion adhesive layer of the transparent screen film in which the light diffusion adhesive layer is formed on one side of the PET film substrate and the protective layer is formed on the other surface is peeled off, and the light diffusion adhesion is performed. The agent layer side was bonded to the float glass.

[Comparative Example 2]
First, in the same manner as in Example 1, an infrared reflective film (transparent heat shielding member) having a protective layer on the infrared reflective layer was produced.

<Formation of adhesive layer>
First, as a release film, a PET film “NS-38 + A” (trade name, thickness: 38 μm) manufactured by Nakamoto Pax Co., Ltd., one side of which was treated with silicone was prepared. In addition, an ultraviolet absorber manufactured by Wako Pure Chemical Industries, Ltd. with respect to 100 parts of an acrylic adhesive solution “SK Dyne 2094” (trade name, solid content: 25 mass%, refractive index: 1.49) manufactured by Soken Chemical Co., Ltd. (Benzophenone series)
25 parts and 0.27 parts of a cross-linking agent “E-AX” (trade name, solid content: 5%) manufactured by Soken Chemical Co., Ltd. are added, dispersed and blended with a disper, and then defoamed to form an adhesive layer. A coating solution was prepared.

Next, on the surface of the release film on the side of the PET film that has been treated with silicone, the pressure-sensitive adhesive layer-forming coating solution is applied and dried so that the thickness after drying is 25 μm.
An adhesive layer was formed. Furthermore, the surface of the infrared reflective film having the protective layer on which the protective layer is not formed is bonded to the exposed surface of the pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer on one side of the PET film substrate, and the other side. An infrared reflective film (transparent heat shielding member) on which an infrared reflective layer, a primer layer, and a protective layer were formed was produced.

<Lamination with glass substrate>
First, a float glass (manufactured by Nippon Sheet Glass Co., Ltd.) having a thickness of 3 mm was prepared as a glass substrate. Next, a release film for the pressure-sensitive adhesive layer of an infrared reflective film (transparent heat-shielding member) in which a pressure-sensitive adhesive layer is formed on one side of the PET film substrate and an infrared reflective layer, a primer layer and a protective layer are formed on the other side. And the pressure-sensitive adhesive layer side was bonded to the float glass.

[Comparative Example 3]
The infrared reflective layer of Example 1 is an indium tin oxide (ITO) layer having a thickness of 35 nm and a thickness of 8 n.
Infrared reflective film with a light diffusing pressure-sensitive adhesive layer (Example 1) except that a three-layered infrared reflective layer comprising an m silver (Ag) layer and a 35 nm thick indium tin oxide (ITO) layer was used. A transparent heat shielding member was prepared and bonded to a glass substrate.

[Comparative Example 4]
Except that the thickness of the silver (Ag) layer in the infrared reflective layer of Example 1 was 21 nm, an infrared reflective film with a light diffusion pressure-sensitive adhesive layer (transparent heat-shielding member) was prepared in the same manner as in Example 1 to produce glass. Bonded to the substrate.

[Comparative Example 5]
Amorphous silicone resin fine particles “TOSPEARL2” in the light diffusion adhesive layer of Example 1
Light diffusion adhesive as in Example 1 except that the addition amount of 40 ″ (trade name, average particle size 4.0 μm) was 0.12 part [0.5 part with respect to 100 parts of adhesive resin]. An infrared reflective film (transparent heat shielding member) with an agent layer was prepared and bonded to a glass substrate.

[Comparative Example 6]
1.38 parts of additive amount of amorphous silicone resin fine particles “TOSPEARL240” (trade name, average particle diameter of 4.0 μm) in the light diffusion adhesive layer of Example 1 [5.5 parts with respect to 100 parts of adhesive resin Except for the above, an infrared reflective film (transparent heat-shielding member) with a light diffusing pressure-sensitive adhesive layer was prepared and bonded to a glass substrate in the same manner as in Example 1.

[Evaluation of transparent member]
With respect to Examples 1 to 14 and Comparative Examples 1 to 6, the samples with the transparent members attached to a 5 cm square glass substrate were used as measurement samples, visible light transmittance, visible light reflectance, haze value, vertical emission The rate, shielding coefficient, initial adhesion of the protective layer, adhesion after the weather resistance test, and scratch resistance were evaluated as follows. In addition, with the transparent samples attached to a glass substrate having a size of 30 cm × 23 cm as a measurement sample, the background visibility and the visibility of the image during projector projection were evaluated as follows.

<Visible light transmittance>
Visible light transmittance is measured using an ultraviolet-visible near-infrared spectrophotometer “Ubest V-570 type” (trade name) manufactured by JASCO Corporation in the wavelength range of 380 to 780 nm with the glass substrate side as the incident light side. Spectral transmittance was measured and calculated according to JIS A5759-2008.

<Visible light reflectance>
Visible light reflectance is determined by using an ultraviolet-visible near-infrared spectrophotometer “Ubest V-570” (trade name) manufactured by JASCO Corporation in the wavelength range of 380 to 780 nm with the transparent base material side as the incident light side. The spectral reflectance was measured and calculated according to JIS R3106-1998.

<Haze value>
The haze value is a haze meter “NDH-” manufactured by Nippon Denshoku Co., Ltd. with the transparent substrate side as the incident light side.
It was measured using 2000 "(trade name) and calculated according to JIS K7136-2000.

<Vertical emissivity>
The vertical emissivity is within a wavelength range of 5 to 25.2 μm with the transparent substrate side as the incident light side.
Infrared spectrophotometer “IR Pre, manufactured by Shimadzu Corporation, equipped with an attachment for specular reflection measurement
Spectral specular reflectance was measured using stige 21 "(trade name), and JIS R3106-20 was measured.
Calculated according to 08. In the calculation of vertical emissivity, the wavelength range 25.2 μm to 50.0 μ
A value of wavelength 25.2 μm was used for the specular specular reflectance of m.

<Shielding coefficient>
The shielding coefficient is spectral transmission using an ultraviolet-visible near-infrared spectrophotometer “Ubest V-570” (trade name) manufactured by JASCO Corporation in the wavelength range of 300 to 2500 nm with the glass substrate side as the incident light side. The reflectance and the spectral reflectance were measured and calculated using the values of solar transmittance and solar reflectance calculated according to JIS A5759-2008 and the values of the vertical emissivity.

<Initial adhesion of protective layer>
The adhesion of the protective layer of the transparent member was evaluated by a cross-cut tape peeling test according to JIS D0202-1988. Specifically, Nichiban cellophane tape “CT24” (trade name)
After making it adhere to the said protective layer with the belly of a finger, it peeled and evaluated adhesiveness. Its evaluation is 1
Expressed by the number of squares not peeled out of 00 squares, the case where the protective layer does not peel at all is 100
/ 100, the case where the protective layer completely peeled was expressed as 0/100.

<Adhesion after weathering test of protective layer>
The adhesion after the weather resistance test of the protective layer of the transparent member is the same as in the case of the above initial adhesion after performing a weather resistance test in which a sunshine carbon arc lamp is irradiated for 1000 hours in accordance with JIS A5759-2008. evaluated.

<Abrasion resistance of protective layer>
The scratch resistance of the protective layer of the transparent member is determined by the steel wool (# 00 made by Bonstar) on the protective layer.
00), and a steel wool was reciprocated 10 times in a state where a load of 250 g / cm ² was applied, and then the state of the surface of the protective layer was visually observed and evaluated in the following three stages.

A: When no scratches are found B: When several scratches (5 or less) are confirmed C: When many scratches are confirmed

<Background visibility>
The visibility of the background was evaluated by visual evaluation of the visibility of the background on the other side that could be seen through the sample by using each transparent member attached to a glass substrate having a size of 30 cm × 23 cm as a measurement sample.

<Visibility of images during projection by projector>
The visibility of the image at the time of projection by the projector is based on the microvision portable laser pico projector “SHOWWWX + HDMI (registered trademark) Laser Pocket P
"Projector" (trade name) is used to project the image from the transparent member side that is actually pasted on a 30cm x 23cm glass substrate. The reflected image on the projector side has brightness (brightness) and blurring. (Image clarity), presence or absence of glare, and the projector visually evaluated brightness (brightness) and presence / absence (image clarity) of the transmitted image on the opposite side.

The luminance (brightness) was evaluated according to the following four levels.
◎: Image brightness is extremely high and visibility is very good ○: Image brightness is high and visibility is good △: Image brightness is slightly low and visibility is slightly inferior ×: Image is hardly visible The sharpness was evaluated according to the following four levels.
A: There is no image blur and the image sharpness is very good. B: The image blur is slightly but the image sharpness is good.
Δ: Image blur is slightly inferior to image sharpness ×: Image blur is inferior to image sharpness The presence or absence of glare was evaluated in the following two stages.
○: No glaring sensation ×: glaring sensation

The above results are shown in Tables 1 to 4 together with the layer structure of the transparent heat insulating and heat insulating member bonded to the glass substrate.
Shown in

As shown in Tables 1 to 4, the transparent member having the infrared reflective layer and the light diffusion layer of Examples 1 to 14 has a visible light reflectance of 12% or more and 30% or less, a haze value of 5% or more, 35 %Less than,
Transparent for digital signage that has a shielding coefficient of 0.69 or less, can see through the background well, can be used as a heat-shielding film for energy saving, and can be viewed well on both sides of the content image projected by the projector It can be seen that the screen has sufficient performance.

In Example 8, a protective layer having a thickness of 3.5 μm having a thickness of 5.0 μm or less is provided on the infrared reflective layer via a primer layer having a thickness of 0.1 μm. Emissivity is 0.
It is 50 or less and it turns out that it has heat insulation as well as heat insulation. In Examples 1 to 7, 11, 13, and 14, a protective layer having a thickness of 2.0 μm or less is provided directly on the infrared reflective layer or via a primer layer having a thickness of 0.1 μm. The vertical emissivity is 0
. It is 30 or less and it turns out that it has higher heat insulation performance with heat insulation.

In Example 3, since the thickness of the silver layer in the infrared reflective layer was increased to 15 nm, the visible light transmittance was less than 65%, and the background visibility was slightly inferior in comparison with Examples 1 and 2. It was. In Example 7, since the thickness of the protective layer was as thin as 0.5 μm, the scratch resistance was slightly inferior in comparison with Example 1.

In Example 12, since the light diffusing layer is formed on the infrared reflecting layer (formed on the projector side that projects the light diffusing layer to the infrared reflecting layer), the reflected image has extremely high luminance and visibility. Was very good and the image was not blurred and the image was very clear.
Since the light diffusing layer absorbs infrared rays, the vertical emissivity is high, and the heat insulating property was not recognized. In Example 13, since the protective layer was directly provided on the infrared reflective layer without a primer layer, the adhesion after the weather resistance test was inferior in comparison with Example 1. In Example 14, since a silicone-based thermosetting resin was used for the protective layer, the scratch resistance was slightly inferior in comparison with Example 1.

On the other hand, Comparative Example 1 has a light diffusing layer, but does not have an infrared reflecting layer, so that the shielding coefficient is as high as 0.89 and the vertical emissivity is as high as 0.93. In the reflected image, the luminance was slightly low, the image was slightly blurred, and the visibility was slightly inferior. Comparative Example 2 has an infrared reflection layer, but does not have a light diffusion layer.
Both the transmission images were hardly visible. Comparative Example 3 has an infrared reflective layer and a light diffusing layer, but has a visible light reflectance of less than 12%. Therefore, in the reflected image, the luminance is slightly low, and there is a slight blur of the image. Slightly inferior.

Comparative Example 4 has an infrared reflection layer and a light diffusion layer, but has a visible light reflectance of 30%.
Therefore, the half mirror feeling was strong, the reflected image was glaring, and the transmitted image was slightly low in brightness and slightly inferior in visibility. Moreover, the visible light transmittance | permeability also fell and the background visibility was inferior. Comparative Example 5 has an infrared reflective layer and a light diffusing layer, but since the haze value is less than 5%, both the reflected image and the transmitted image can be recognized slightly, but are hardly visible. It was close to the state. Although the comparative example 6 has an infrared reflective layer and a light diffusion layer, since the haze value exceeds 35%, the transparent member is slightly whitish and the background visibility is slightly inferior. It was.

When the transparent member of the present invention is used by being bonded to a transparent substrate such as a window glass with a transparent adhesive or the like, the background can be satisfactorily seen through, and the transparent heat insulating member or the transparent heat insulating heat insulating member, that is, for energy saving. It can be used as a solar control transparent film and can also be used as a transparent screen for digital signage that allows a content image projected by a projector to be viewed well from both sides, so it is very useful in any scene.

DESCRIPTION OF SYMBOLS 10 Transparent heat-shielding member provided with transparent screen function 11 Transparent base material 12 Infrared reflective layer 13 Primer layer 14 Protective layer 15 Light diffusion layer 16 Adhesive layer 17 Light diffusion adhesive layer 18 Glass plate 20 Transparent heat insulation member 30 Transparent screen

Claims (6)

Transparent heat-shielding member with a transparent screen function that allows the image projected from the projector to the screen to be viewed from both sides as a reflected image from the projector side and as a transmitted image from the opposite side of the projector across the screen Because
The transparent heat-shielding member having the transparent screen function is at least with respect to the transparent substrate.
(1) an infrared reflecting layer having a metal layer, a metal oxide layer and / or a metal nitride layer, and
(2) a light diffusing layer in which light diffusing particles are dispersed in a transparent resin,
A transparent member having
The light diffusing layer is disposed on the opposite side of the surface of the transparent substrate on which the infrared reflecting layer is formed, or between the transparent substrate and the infrared reflecting layer,
And,
(3) Visible light reflectance measured according to JIS R3106-1998 is 12% or more and 30% or less
(4) haze value measured according to JIS K7136-2000 is 5% or more, 35% or less,
(5) The shielding coefficient measured according to JIS A5759-2008 is 0.69 or less,
(6) The value of vertical emissivity measured according to JIS R3106-2008 is 0.53 or less,
A transparent heat-shielding member having a transparent screen function. The transparent heat shielding member having the transparent screen function according to claim 1, wherein the transparent heat shielding member having the transparent screen function has a visible light transmittance of 65% or more measured according to JIS A5759-2008. Heat shield member. In the state where the transparent heat-shielding member having the transparent screen function is attached to a transparent substrate and used, the outermost surface layer (air side) is a hard coat protective layer containing at least an ionizing radiation curable resin or a thermosetting resin The transparent heat-shielding member having a transparent screen function according to claim 1, wherein the transparent heat-shielding member has a transparent screen function. The transparent screen according to claim 3 , wherein the hard coat protective layer is laminated on the infrared reflective layer through a primer layer made of a polyolefin resin modified with an acid, an acid anhydride or a hydroxyl group. A transparent heat shield with a function. In the transparent heat-shielding member provided with the said transparent screen function, the value of the vertical emissivity measured according to JISR3106-2008 is 0.50 or less, The any one of Claims 1-4 characterized by the above-mentioned. A transparent heat-shielding member having a heat insulating property having the described transparent screen function. In the transparent heat-shielding member provided with the said transparent screen function, the value of the vertical emissivity measured according to JISR3106-2008 is 0.30 or less, The any one of Claims 1-5 characterized by the above-mentioned. A transparent heat-shielding member having a heat insulating property having the described transparent screen function.

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