JP2022038592A - Transparent screen laminate that can be seen through - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transparent transparent screen laminate having good transparency and preventing an image passing through a transparent screen from being reflected in another place. SOLUTION: The light-transmitting support has a light-diffusing layer in which light-diffusing fine particles are carried by xerogel and / or a light-diffusing layer in which light-diffusing fine particles are carried by gelatin gel on one surface of the light-transmitting support. It is characterized by having a light-transmitting metal layer on either the surface of the support having a light-diffusing layer or the surface of the light-transmitting support having no light-diffusing layer. , Transmissive screen laminate. [Selection diagram] Fig. 2

Description

The present invention relates to a fluoroscopic transmissive screen laminate suitable for window display applications.

Currently, the so-called rear projection type transmissive screen, in which the image projected from the projector is visually recognized from the opposite side of the projector across the screen, is becoming widespread in place of the conventional advertising media such as posters, signs, and signboards. be. In recent years, it has attracted a great deal of attention as a digital signage that can project digital content on a large screen, which does not require replacement, can be changed immediately, and requires dynamic posting as well as static.

In particular, many store show windows face the road through which customers pass, and if the windows can be replaced with digital signage that is used as a large screen, it will be very useful as an advertising medium, and it will be very useful as a show window sticking type. However, there is an increasing need for so-called transmissive screens for window displays.

As such a transmissive transmissive screen, Japanese Patent Application Laid-Open No. 2001-242546 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2007-34324 (Patent Document 2) use a transparent resin binder between the transparent body and the adhesive layer. Light scattering containing spherical fine particles having an average particle size of 1.0 to 10 μm and a relative refractive index n with respect to the refractive index of the transparent resin binder of 0.91 <n <1.09 (where n ≠ 1). Transmissive screens with layers have been proposed.

In recent years, as transmissive screens having both higher transparency and visibility of images projected from a projector, Japanese Patent Application Laid-Open No. 2013-182141 (Patent Document 3) and Japanese Patent Application Laid-Open No. 2013-210454 (Patent Document 4). Therefore, a transmissive screen having a light diffusing layer containing light diffusible fine particles and xerogel on at least one surface of a light transmissive support has been proposed, and Japanese Patent Application Laid-Open No. 2019-174546 (Patent Document 5) describes average particles. A transmissive screen having a light diffusing layer in which light diffusing fine particles having a diameter of 45 nm or more and 340 nm or less are supported on a gelatin gel has been proposed.

On the other hand, one of the major problems of projectors, the problem of the projection distance from the projector to the screen, has been greatly improved by the spread of so-called short focal length or ultra short focal length projectors, which have a short focal length. Even in the case of a transmissive screen, the degree of freedom in the installation location has been significantly improved because the projection distance in the store is short.

However, when projected onto these transparent transmissive screens with a short-focus or ultra-short-focus projector, for example, digital content is displayed on the transparent transmissive screen attached to the show window from a projector suspended on the ceiling in the store. In the case of projection, the image that passed through the screen leaked out of the store, and the image may be reflected on the street or the like. In addition, when digital content is projected onto a transparent transparent screen attached to a show window from a projector installed on the floor of the store, the image passing through the screen may be reflected in the facing building.

Regarding the problem that an image passing through such a transparent transmissive screen is reflected in another place, for example, in Japanese Patent Application Laid-Open No. 2018-106138 (Patent Document 6), it is projected at least on a base material and a base material. A transparent screen having a light-scattering film for displaying an image and a light control film for controlling the incident light angle dependence of visible light transmittance on the light-scattering film has been proposed. For example, Japanese Patent Application Laid-Open No. 2020-76894. In (Patent Document 7), a transparent transmissive screen laminate having a light-diffusing layer containing light-diffusing fine particles directly on at least one surface of a field-of-sight control base material that controls visibility without interposing another layer. The body is proposed.

However, further improvement has been required for the problem that the image passing through the see-through transmissive screen is reflected in another place.

On the other hand, it is known to provide a metal layer on a transparent screen that can be seen through. For example, Japanese Patent Application Laid-Open No. 2010-1628 (Patent Document 8) discloses a daylighting surface material for a window in which a half mirror made of a metal thin film layer and an imaging sheet in which light diffusing particles are dispersed are laminated on a transparent substrate. It is described that the daylighting surface material can ensure daytime and nighttime privacy. Further, Japanese Patent Application Laid-Open No. 2016-186627 (Patent Document 9) has a metal layer, an infrared reflective layer, and a light diffusing layer in which light diffusing particles are dispersed in a transparent resin on a transparent base material, and is visible light. A transparent heat shield member having a transparent screen function in which the reflectance, haze, and shielding coefficient are in a specific range is disclosed, and the visibility of the projected image from both sides of the screen, especially the reflection visibility from the projector side, is also good. It is described that a high brightness and image sharpness can be obtained.

Japanese Unexamined Patent Publication No. 2001-242546 Japanese Unexamined Patent Publication No. 2007-34324 Japanese Unexamined Patent Publication No. 2013-182141 Japanese Unexamined Patent Publication No. 2013-210454 Japanese Unexamined Patent Publication No. 2019-174546 Japanese Unexamined Patent Publication No. 2018-106138 Japanese Unexamined Patent Publication No. 2020-76894 Japanese Unexamined Patent Publication No. 2010-1628 Japanese Unexamined Patent Publication No. 2016-186627

An object of the present invention is to provide a transparent transparent screen laminate in which the brightness of the scenery seen through the transparent screen is excellent and the image passing through the transparent screen is not easily reflected in another place.

The above object is achieved by the following invention.
On one surface of the light-transmitting support, a light-diffusing layer in which light-diffusing fine particles are carried by xerogel and / or a light-diffusing layer in which light-diffusing fine particles are carried by gelatin gel are provided on the light-transmitting support. A translucent metal layer is provided on either the surface having the light diffusing layer or the surface having no light diffusing layer on the light transmitting support. Transmissive screen laminate.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a transparent transparent screen laminate in which the brightness of the scenery seen through the transparent screen is excellent and the image passing through the transparent screen is less likely to be reflected in another place.

Schematic cross-sectional view showing an example of the transmissive screen laminate of the present invention. Schematic cross-sectional view showing another example of the transmissive screen laminate of the present invention. Schematic diagram showing an example of use of the transmissive screen laminate of the present invention. Schematic diagram showing another use example of the transmissive screen laminate of the present invention. Schematic diagram showing an example of use of a conventional transmissive screen laminate Schematic diagram showing another use example of a conventional transmissive screen laminate

The present invention will be described in detail below.

The term "transparent" in the present invention means that the haze value of the transmissive screen laminate is 60% or less when the separate base material and the protect base material that are removed during use are removed. A more preferable haze value is 50% or less. Having such a haze value makes it possible to visually recognize the scenery on the opposite side through the transmissive screen, so that the transmissive screen laminate is suitably used for window display applications.

The haze value in the present invention is a value defined below in accordance with JIS-K7136: 2000, and the lower the value, the better the transparency.
H = (Td / Tt) × 100 (%)
H: Haze value Td: Diffusion transmittance Tt: Total light transmittance

The total light transmittance, the diffusion transmittance, and the haze value can be measured using, for example, a haze meter HZ-V3 manufactured by Suga Test Instruments Co., Ltd.

The translucent screen laminate of the present invention is a light diffusion layer in which light-diffusing fine particles are supported by xerogel on one surface of a light-transmitting support and / or light diffusion in which light-diffusing fine particles are carried by gelatin gel. Light transmission to either the surface having a layer and having a light diffusing layer on the light transmitting support or the surface having no light diffusing layer on the light transmitting support. It is characterized by having a metal layer. More specifically, one surface of the light-transmitting support has a light-diffusing layer in which light-diffusing fine particles are carried by xerogel and / or a light-diffusing layer in which light-diffusing fine particles are carried by gelatin gel. It is characterized by having a light-transmitting metal layer at any position between the sex support and the light-diffusing layer, on the light-diffusing layer, or on the light-transmitting support on the side without the light-diffusing layer. do.

FIG. 1 is a schematic cross-sectional view showing an example of a transparent screen laminate of the present invention. As the configuration of the transmissive screen laminate 100 of the present invention, as shown as (1-1) in FIG. 1, the light diffusing fine particles 21 are supported on one surface of the light transmissive support 10 by the xerogel 22. The light-transmitting metal layer 30 has a light-diffusing layer 20 in which the light-diffusing fine particles 21 are carried by the light-diffusing layer 20 or the gelatin gel 23, and the light-transmitting support 10 does not have the light-diffusing layer 20. As shown in FIG. 1 as (1-2), the light diffusing layer 20 or the light diffusing layer 20 in which the light diffusing fine particles 21 are supported by the xerogel 22 on one surface of the light transmissive support 10 or An example is a configuration in which a light-diffusing layer 20 in which light-diffusing fine particles 21 are carried by a gelatin gel 23 is provided, and a light-transmitting metal layer 30 is provided between the light-transmitting support 10 and the light-transmitting layer 20. Further, although not shown in FIG. 1, the light diffusing layer 20 in which the light diffusing fine particles 21 are carried by the xerogel 22 or the light diffusing fine particles 21 are carried by the gelatin gel 23 on one surface of the light transmitting support 10. An example also includes a configuration in which the light diffusing layer 20 and the light transmissive metal layer 30 are provided in this order.

FIG. 2 is a schematic cross-sectional view showing another example of the transmissive screen laminate of the present invention. As another configuration of the transmissive screen laminate 100 of the present invention, as shown as (2-1) in FIG. 2, the light diffusing fine particles 21 are supported by the xerogel 22 on one surface of the light transmissive support 10. The adhesive layer 40 and light are on the surface of the light transmissive support 10 on the side that does not have the light diffusing layer 20 and has the light diffusing layer 20 in which the light diffusing fine particles 21 are supported by the light diffusing layer 20 or the gelatin gel 23. A configuration having a transmissive metal layer 30 and a light transmissive support 11 in this order, or as shown as (2-2) in FIG. 2, light is diffused by a xerogel 22 on one surface of the light transmissive support 10. It has a light diffusing layer 20 carrying light diffusing fine particles 21 or a light diffusing layer 20 carrying light diffusing fine particles 21 with a gelatin gel 23, and has an adhesive layer 40, a light transmitting metal layer 30 and light transmitting on the light diffusing layer 20. Examples of configurations having the sex support 11 in this order can be exemplified, but the present invention is not limited thereto.

3 and 4 are a schematic view showing an example of using one of the transparent screen laminates of the present invention and a schematic diagram showing another use example of the transparent screen laminate of the present invention, FIG. 5; And FIG. 6 is a schematic view showing one use example and another use example when a conventional transparent transparent screen laminate is used. 3 and 5 show images projected onto the transmissive screen laminate 100 of the present invention or the conventional transmissive screen 200 attached to the show window 60 from a projector 50 suspended from the ceiling in the store, respectively. 4 and 6 show the transmissive screen laminate 100 of the present invention or the conventional transmissive screen laminate 200 attached to the show window 60 from the projector 50 installed on the floor in the store, respectively. It shows how the image was projected on. In FIGS. 5 and 6, the image that has passed through the conventional transmissive screen laminate 200 leaks out of the store, and the image 70 projected outside the store may be displayed on the street or in the opposite building, respectively, which is a problem. Become. On the other hand, in FIGS. 3 and 4, the above-mentioned problems of FIGS. 5 and 6 can be avoided.

It is easy to imagine that a light-transmitting light-shielding layer is provided for the purpose of preventing the projected image from passing through the transmissive screen. However, when, for example, a light-transmitting light-shielding layer containing a black pigment is provided on the transmissive screen instead of the light-transmitting metal layer of the present invention, the projected image certainly passes through the transmissive screen. Although it could be suppressed, its effect was limited. Further, even if the light diffusing layer has the light diffusing layer and the light transmitting metal layer, the light diffusing layer does not have a structure in which the light diffusing fine particles 21 are supported by the xerogel and / or a structure in which the light diffusing fine particles 21 are supported by the gelatin gel. In this case, the effect of suppressing the projected image from passing through the transmissive screen was also limited.

On the other hand, the see-through transmissive screen laminate of the present invention has the configurations shown in FIGS. 1 and 2 described above, so that the image passing through the see-through transmissive screen is less likely to be reflected in another place. , A transparent screen laminate that can be seen through can be provided. Although the detailed reason is unknown, the light-transmitting metal layer can form a more uniform layer than the light-shielding layer made of black pigment or the like, so that the increase in haze can be suppressed, and the light is diffused by xerogel. The presence of a light-diffusing layer carrying light-diffusing fine particles and / or a light-diffusing layer carrying light-diffusing fine particles in a gelatin gel allows more efficient projection while maintaining the brightness of the view through a transmissive screen. It is speculated that it can prevent the image from passing through the transparent screen.

The light-transmitting support of the translucent screen laminate of the present invention is not particularly limited as long as it has light-transmitting property, and a plate-shaped or film-shaped one made of glass or plastic is used. be able to. The type of glass is not particularly limited, but in general, oxide glass such as silicate glass, phosphate glass, and borate glass is practical, and in particular, silicate glass and alkali silicate glass are practical. , Soda lime glass, potash lime glass, lead glass, barium glass, borosilicate glass and the like silicate glass are preferable. As the plastic, for example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polypropylene, polyethylene, polyarylate, acrylic, acetyl cellulose, polyvinyl chloride and the like can be used. , It is preferable because the mechanical strength is improved. The total light transmittance of the light-transmitting support is preferably 60% or more, and the haze value is preferably 30% or less.

In the present invention, the thickness of the light-transmitting support can be appropriately selected depending on the material to be applied, but is generally 10 μm to 30 mm, preferably 20 μm to 20 mm. The light-transmitting support may contain known additives such as an ultraviolet absorber, an antioxidant, a lubricant, a plasticizer, a mold release agent, a color inhibitor, a flame retardant, and an antistatic agent. Although not shown in FIGS. 1 and 2, the light-transmitting support may have known layers such as an easy-adhesion layer, a hard coat layer, and an antistatic layer, and may be corona-treated or plasma-treated. , A known surface modification treatment such as a primer treatment and a saponification treatment may be performed.

In the present invention, the light diffusing fine particles contained in the light diffusing layer can be used regardless of whether they are organic fine particles or inorganic fine particles as long as they have the ability to diffuse light, but the image projected from the projector can be visually recognized. Single particle dispersive light-diffusing fine particles with an average primary particle size of 0.10 μm or more, or an average secondary particle size of 0.10 μm or more from the viewpoint of a very wide viewing angle and improved visibility from both sides of the screen. It is preferable that the light-diffusing fine particles having the secondary aggregated particle system (hereinafter referred to as aggregated particle-dispersible light-diffusing fine particles). The upper limit of the average primary particle size of the light diffusible fine particles having a single particle dispersibility is preferably 200 μm or less. Further, the upper limit of the average secondary particle diameter of the agglomerated particle-dispersible light-diffusing fine particles is preferably 200 μm or less.

The average primary particle size referred to in the present invention can be measured by taking a picture with a transmission electron microscope, but in the case of single particle dispersive light diffusing fine particles, a laser scattering type particle size distribution meter (for example, It can be measured as a number median diameter using LA-910) manufactured by Horiba Seisakusho Co., Ltd. The average secondary particle size of the agglomerated particle-dispersible light-diffusing fine particles can be measured as a number median diameter using a laser scattering type particle size distribution meter (for example, LA-910 manufactured by HORIBA, Ltd.). ..

Further, the refractive index of the light diffusing fine particles is preferably 1.30 or more, but when it exceeds 1.55, the viewing angle is particularly wide and the transparency is excellent from both sides of the screen. It is preferable because a mold screen laminate can be obtained.

Examples of the organic fine particles used as the light diffusible fine particles include acrylic polymer, styrene-acrylic copolymer, vinyl acetate-acrylic copolymer, vinyl acetate polymer, ethylene-vinyl acetate copolymer, and chlorinated polyolefin weight. Combined, multi-component copolymers such as ethylene-vinyl acetate-acrylic, SBR, NBR, MBR, carboxylated SBR, carboxylated NBR, carboxylated MBR, polyvinyl chloride, polyvinylidene chloride, polyester, polyolefin, polyurethane, polymethacrylate, Widely selected from conventionally known ones such as polytetrafluoroethylene, polymethyl methacrylate, polycarbonate, polyvinyl acetal resin, rosin ester resin, episulfide resin, epoxy resin, silicone resin, silicone-acrylic resin, melamine resin, etc. can. Further, those in which the surface of fine particles such as melamine resin and acrylic resin are coated with inorganic fine particles such as silica can also be used. Further, even when composite particles of such organic fine particles and a small amount of inorganic fine particles (the ratio of the inorganic fine particles is less than 50% by mass) are used, they can be substantially regarded as organic fine particles and used. Furthermore, those in which a sulfur atom is introduced into the monomer of the polymer constituting the organic fine particles for the purpose of increasing the refractive index, and those in which a fluorine substituent is introduced to improve the weather resistance or lower the refractive index can be used. can.

Inorganic fine particles used as light diffusible fine particles include silica, alumina, rutile-type titanium dioxide, anatase-type titanium dioxide, zinc oxide, zinc sulfide, lead white, antimony oxide, zinc antimonate, lead titanate, and potassium titanate. , Zirconium oxide, cerium oxide, hafnium oxide, tantalum pentoxide, niobium pentoxide, yttrium oxide, chromium oxide, tin oxide, molybdenum oxide, ATO, ITO, silicate glass, phosphate glass, borate glass, etc. There are oxide glasses of the above, and these composite oxides or composite sulfides can also be widely used. Further, in the case of inorganic fine particles having photocatalytic activity such as titanium dioxide and zinc oxide, those having an extremely thin surface coated with silica, alumina, boron or the like can also be used. Further, even when composite particles composed of inorganic fine particles and a small amount of organic fine particles (the ratio of the organic fine particles is less than 50% by mass) are used, they can be substantially regarded as inorganic fine particles and used. Further, the inorganic fine particles used as the light diffusible fine particles are preferably single particle dispersible inorganic fine particles.

In the present invention, the organic fine particles and the inorganic fine particles used as the light diffusing fine particles can be used individually or in combination of a plurality of types, or both the organic fine particles and the inorganic fine particles can be mixed and used. be.

In the present invention, the content of the light diffusing fine particles contained in the light diffusing layer is not particularly limited, and is per unit mass of the light diffusing fine particles calculated from the refractive index of the light diffusing fine particles, the average primary particle size and the specific gravity. Although it depends on the specific surface area, it is preferably 0.005 to 15.0 g / m ² , more preferably 0.01 to 12.0 g / m ² , and further preferably 0.03 to 10.0 g / m ² . be.

The light diffusing layer in the present invention is a layer in which light diffusing fine particles are carried by xerogel and / or a layer in which light diffusing fine particles are carried by gelatin gel. Due to the effect of the light diffusing layer carrying the light diffusing fine particles with xerogel and / or the light diffusing layer carrying the light diffusing fine particles with the gelatin gel and the light transmitting metal layer described later, the light diffusing screen was passed through. An effect that makes it difficult for the image to be reflected in other places can be obtained.

In the present invention, the xerogel in the case of using the light diffusion layer in which the light diffusing fine particles are supported by the xerogel is a gel having a network structure in which the internal solvent is lost due to evaporation or the like and has voids. The porosity of the light diffusion layer on which the diffusible fine particles are carried is preferably 40% or more, more preferably 50% or more.

Porosity is defined by the following equation. Here, the void volume V is the cumulative pore volume (ml / g) from the pore radius of 3 nm to 400 nm in the light diffusion layer measured and processed using a mercury porosimeter (measuring instrument name: Autopore II 9220 manufacturer micromeritics instrument corporation). By multiplying this by the amount of dry solid content (g / square meter) of the light diffusion layer, it can be obtained as a numerical value per unit area (square meter). Further, the coating layer thickness T can be obtained by photographing the cross section of the light diffusion layer with an electron microscope and measuring the length.
P = (V / T) x 100 (%)
P: Porosity (%)
V: Void volume (ml / m ² )
T: Coating layer thickness (μm)

In the present invention, the xerogel is preferably composed of inorganic fine particles and a resin binder, and more preferably composed of inorganic fine particles having an average primary particle diameter of 18 nm or less and a resin binder. If the average primary particle diameter exceeds 18 nm, the transparency of the light diffusion layer may decrease and sufficient transparency and brightness may not be obtained. Further, the inorganic fine particles constituting the xerogel of the present invention preferably have a secondary aggregated particle diameter of 500 nm or less on average. If the average secondary particle diameter exceeds 500 nm, the transparency of the light diffusion layer may decrease and sufficient transparency and brightness may not be obtained. In the case of inorganic fine particles having a secondary aggregate particle size, the average primary particle size referred to in the present invention can be measured by photography with a transmission electron microscope, and the average secondary particle size is a laser scattering type particle size. It can be measured as a number median diameter using a distribution meter (for example, LA-910 manufactured by Horiba Seisakusho Co., Ltd.).

Examples of the inorganic fine particles constituting the xerogel include various known fine particles such as amorphous synthetic silica, alumina, alumina hydrate, calcium carbonate, magnesium carbonate, and titanium dioxide, but they are amorphous because a high void ratio can be obtained. Synthetic silica, alumina or alumina hydrate is preferred.

Amorphous synthetic silica can be roughly classified into wet method silica, vapor phase method silica, and others depending on the production method. Wet silica is further classified into precipitation silica, gel silica, and sol silica depending on the production method. Precipitation method Silica is produced by reacting sodium silicate and sulfuric acid under alkaline conditions, and the silica particles that have grown particles are aggregated and settled, and then commercialized through the steps of filtration, washing with water, drying, crushing and classification. As the precipitation method silica, for example, Tosoh Silica Co., Ltd. as Nipseal (registered trademark), Oriental Silicas Corporation as Tokuseal (registered trademark), Fineseal (registered trademark), Mizusawa Industrial Chemicals Co., Ltd. as Mizukasil (registered trademark). ) Is commercially available. Gel method Silica is produced by reacting sodium silicate and sulfuric acid under acidic conditions. During aging, the fine particles dissolve and reprecipitate to bond other primary particles to each other, so that the distinct primary particles disappear and form relatively hard aggregated particles with an internal void structure. For example, from Tosoh Silica Co., Ltd. as Nipgel (registered trademark), W. R. It is commercially available from Grace & Company as SYLOID (registered trademark) and SYLOJET (registered trademark) as Mizusawa Industrial Chemicals Co., Ltd. as Mizukasil. The sol method silica, also called colloidal silica, is obtained by heat-aging a silica sol obtained through compound decomposition with an acid of sodium silicate or an ion exchange resin layer, and is commercially available from Nissan Chemical Industries, Ltd., for example, as Snowtex (registered trademark). Has been done.

Gas phase silica is also called a dry method as opposed to a wet method, and is generally produced by a flame hydrolysis method. Specifically, a method of burning silicon tetrachloride together with hydrogen and oxygen is generally known, but instead of silicon tetrachloride, silanes such as methyltrichlorosilane and trichlorosilane can also be used alone or silicon tetrachloride. Can be used in a mixed state with. Gas phase silica is commercially available as Aerosil (registered trademark) from Nippon Aerosil Co., Ltd. and QS type from Tokuyama Corporation.

Gas phase silica can be preferably used in the present invention. The average primary particle size of the vapor phase silica used in the present invention is preferably 18 nm or less, and in order to obtain higher transparency, the average primary particle size is 3 to 15 nm and the specific surface area by the BET method is 200 m. Use ² / g or more. The average primary particle diameter referred to in the present invention is the average particle diameter obtained by using the diameter of a circle equal to the projected area of each of the 100 primary particles existing in a certain area as the particle diameter by observing the fine particles with an electron microscope. The BET method in the present invention is one of the methods for measuring the surface area of powder by the vapor phase adsorption method, and is a method for obtaining the total surface area of 1 g of a sample from the adsorption isotherm, that is, the specific surface area. Usually, as the adsorbed gas, nitrogen gas is often used, and the method of measuring the adsorbed amount from the pressure or the change in volume of the adsorbed gas is most often used. The most prominent representation of the isotherms of multimolecular adsorption is the Brunauer, Emmett, and Teller equations, called the BET equations, which are widely used to determine surface area. The adsorption amount is obtained based on the BET formula, and the surface area is obtained by multiplying the area occupied by one adsorbed molecule on the surface.

The vapor phase silica is preferably dispersed in the presence of a cationic compound. As a result, a light diffusion layer having a high porosity can be obtained, and a transmissive screen laminate having excellent image visibility can be obtained. As a dispersion method, vapor phase silica and a dispersion medium are premixed by ordinary propeller stirring, turbine type stirring, homomixer type stirring, etc., then a media mill such as a ball mill, a bead mill, a sand grinder, a high pressure homogenizer, and an ultrahigh pressure. It is preferable to perform dispersion using a pressure type disperser such as a homogenizer, an ultrasonic disperser, a thin film swirl type disperser, or the like.

In the present invention, wet method silica obtained by pulverizing an average secondary particle diameter to 500 nm or less can also be preferably used. As the wet method silica used here, precipitation method silica or gel method silica is preferable, and precipitation method silica is particularly preferable. The wet silica particles used in the present invention are preferably wet silica particles having an average primary particle diameter of 18 nm or less and an average aggregated particle diameter of 5 to 50 μm, which are finely ground in the presence of a cationic compound. It is preferable to use the wet method silica fine particles.

As the alumina used in the present invention, γ-alumina, which is a γ-type crystal of aluminum oxide, is preferable, and δ group crystals are particularly preferable. Although γ-alumina can reduce the size of primary particles to about 10 nm, it is usually possible to reduce the size of secondary particle crystals from several thousand to tens of thousands nm by ultrasonic waves, high-pressure homogenizers, counter-collision jet crushers, etc. on average. A particle having a particle size of 500 nm or less, preferably 20 to 300 nm or less, can be used.

The alumina hydrate of the present invention is represented by the constitutive equation of Al ₂ O ₃ · nH ₂ O (n = 1 to 3). Alumina hydrate can be obtained by a known production method such as hydrolysis of aluminum alkoxide such as aluminum isopropoxide, neutralization of aluminum salt with alkali, and hydrolysis of aluminate.

The above-mentioned alumina and alumina hydrate used in the present invention are used in the form of a dispersion liquid dispersed with known dispersants such as acetic acid, lactic acid, formic acid and nitric acid.

It is also possible to use two or more kinds of inorganic fine particles together from the above-mentioned inorganic fine particles. For example, the combined use of pulverized wet silica and vapor phase silica, the combined use of finely pulverized wet silica with alumina or alumina hydrate, and the combined use of vapor phase silica with alumina or alumina hydrate can be mentioned. .. The ratio in the case of this combined use is preferably in the range of 7: 3 to 3: 7 in any mode.

In the present invention, a resin binder is used together with the above-mentioned inorganic fine particles in forming a xerogel. The resin binder is not particularly limited, but a hydrophilic resin binder having high transparency is preferably used. For example, polyvinyl alcohol, polyethylene oxide, polyvinylpyrrolidone, polyacrylic acid, polyacrylamide, polyurethane, dextran, dextrin, carrageenan (κ, ι, λ, etc.), agar, pullulan, water-soluble polyvinyl butyral, hydroxyethyl cellulose, carboxylmethylcellulose, etc. Can be mentioned. Two or more of these hydrophilic resin binders can be used in combination. Preferred hydrophilic resin binders are fully or partially saponified polyvinyl alcohol and cationically modified polyvinyl alcohol.

The content of the resin binder can be appropriately used as long as it does not significantly impair the transparency of the transparent screen laminate of the present invention. When the light diffusion layer is composed of xerogel, the content of the resin binder is preferably 3 to 200% by mass, more preferably 3 to 150% by mass, and further preferably 5 to 120% with respect to the inorganic fine particles. It is mass%. This makes it possible to obtain a high viewing angle of the image. Further, in this case, the above-mentioned light diffusing fine particles are preferably 0.1 to 200% by mass, particularly preferably 0.3 to 150% by mass, based on the inorganic fine particles constituting the xerogel.

The light diffusion layer may also contain a dural agent, if necessary, together with the resin binder. Specific examples of the hard film agent include aldehyde compounds such as formaldehyde and glutaraldehyde, ketone compounds such as diacetyl and chlorpentandione, bis (2-chloroethyl) urea, and 2-hydroxy-4,6-dichloro-1. , 3,5-Triazine, compounds having reactive halogens as described in US Pat. No. 3,288,775, divinyl sulfone, compounds having reactive olefins as described in US Pat. No. 3,635,718, N-methylol compounds as described in US Pat. No. 2,732,316, isocyanatos as described in US Pat. No. 3,103,437, US Pat. No. 3,017,280, US Pat. No. 2,983. Aziridine compounds as described in 611, carbodiimide compounds as described in US Pat. No. 3,100,704, epoxy compounds as described in US Pat. No. 3,091,537, halogen carboxylaldehydes such as mucochloric acid, There are dioxane derivatives such as dihydroxydioxane, inorganic cross-linking agents such as chromium lightning, zirconium sulfate, borosand, boric acid, borates and the like, and these can be used alone or in combination of two or more.

In the present invention, the gelatin gel in the case of using the light diffusing layer carrying the light diffusing fine particles in the gelatin gel is the gelatin gelled by the sol-gel change. Gelatin is a thermal variant of collagen whose main component is a protein extracted by applying heat to collagen, which is the main component of connective tissues such as animal skin, bones, and tendons. The average molecular weight of gelatin is preferably 30,000 or more, more preferably 70,000 to 150,000. Examples of the type of gelatin include alkaline gelatin using beef bone or cowhide as a raw material, acidic gelatin using pig skin as a raw material, and modified gelatin (for example, phthalated gelatin), which are also contained in these gelatins. Examples thereof include gelatin in which the impurities (for example, salts such as calcium ion, sodium ion, chloride ion, lipid, nucleic acid and its decomposition products, aldehydes, etc.) are reduced by purification or desalting treatment. These gelatins may be used alone or in combination of two or more. In addition, the sol-gel change of gelatin means that gelatin, which has the fluidity of a random coil-like molecular structure in a solution state, takes the original collagen-like spiral structure to form a molecular network and lose its fluidity. It is a state change. In the present invention, the light diffusing fine particles are supported on the gelatin gel means that the light diffusing layer fine particles are immobilized by the light diffusing layer composition containing gelatin in a gelled state. In the present invention, gelatin is gelled in the liquid phase, but when the light diffusion layer composition is subsequently dried, the gel medium changes to the gas phase.

When the light diffusing fine particles are supported by the gelatin gel, the light diffusing layer may contain various polymer components and additives other than gelatin. Examples of the polymer component other than gelatin include an aqueous solution of an acrylic polymer or an aqueous dispersion containing a derivative such as acrylic acid or methacrylic acid or a salt thereof or an ester thereof as a monomer. Examples of other acrylic polymers include acrylic acid polymers, methacrylic acid polymers, vinyl acetate-acrylic acid copolymers, vinyl acetate-methacrylic acid copolymers, vinyl acetate-alkyl acrylate copolymers, and vinyl acetate-. Alkyl methacrylate copolymer, acrylonitrile-alkyl acrylate copolymer, acrylonitrile-alkyl acrylate copolymer, acrylonitrile-alkyl methacrylate copolymer, acrylonitrile-alkyl methacrylate-alkyl methacrylate-styrene copolymer , Acrylonitrile-dialkylmethacrylate aminoalkyl-acrylamide copolymer, acrylate-methacrylate copolymer, acrylate-alkyl acrylate copolymer, etc. and their metal salts or modified products, acrylate-alkyl acrylate-acrylamide Polymers, acrylic acid-methacrylate-styrene copolymers, methacrylic acid-alkyl acrylate-alkyl methacrylate-acrylamide copolymers, methacrylic acid-alkyl methacrylate copolymers, alkyl acrylate-acrylamide-styrene copolymers. Combined, alkyl methacrylate-alkyl acrylate-maleic anhydride copolymer, alkyl acrylate-styrene-maleic anhydride copolymer, alkyl methacrylate-fumaric acid copolymer, alkyl acrylate-itaconic acid copolymer, etc. Examples thereof include aqueous solutions and aqueous dispersions of these metal salts or polymers.

In addition, modified products thereof such as styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, methyl methacrylate-butadiene copolymer, styrene-acrylonitrile-butadiene copolymer, and styrene-methyl methacrylate-butadiene copolymer are included. Examples thereof include aqueous dispersions such as synthetic rubber latex. In addition, various modified or unmodified polyvinyl alcohol, starch derivatives such as oxidized starch and etherified starch, cellulose derivatives such as carboxymethyl cellulose and hydroxyethyl cellulose, and water-soluble polymer resins such as casein, soy protein, and carrageenan are used in combination. It doesn't matter. In the present invention, the preferable content of gelatin contained in the light diffusion layer is 20% by mass or more with respect to the entire light diffusion layer. If it is less than 20% by mass, the light diffusion layer may not be sufficiently gelled by gelatin, fine irregularities may occur on the surface of the light diffusion layer, and screen transparency and image visibility may be insufficient. be.

In forming the above-mentioned gelatin gel, after applying the light diffusing layer coating liquid containing the light diffusing fine particles and gelatin and having a liquid temperature of 20 ° C. or higher, until the drying step, the film surface of the light diffusing layer coating liquid is applied. The temperature is preferably 15 ° C. or lower. By setting the film surface temperature of the light diffusing layer coating liquid to 15 ° C. or lower, gelation of the gelatin component contained in the light diffusing layer coating liquid proceeds sufficiently, so that the light diffusing fine particles are in a particularly uniform dispersed state. Can be obtained, and it becomes possible to achieve both light diffusion performance and screen transparency at a high level.

The dry solid content coating amount of the light diffusion layer in the present invention is preferably in the range of 1 to 50 g / m ² , more preferably in the range of 3 to 40 g / m ² , and particularly preferably in the range of 5 to 30 g / m ² . Further, the light diffusion layer includes a cationic polymer, an antiseptic, a surfactant, a coloring dye, a coloring pigment, an ultraviolet absorber, an antioxidant, a pigment dispersant, a defoaming agent, a leveling agent, an optical brightener, and a viscosity. Stabilizers, hardeners, pH adjusters and the like can also be added.

The light diffusing layer may be composed of two or more layers, and in this case, the composition of the light diffusing layers may be the same as or different from each other. For example, one light-diffusing layer may be a xerogel carrying light-diffusing fine particles, and the other light-diffusing layer may be a gelatin gel carrying light-diffusing fine particles.

In the present invention, various known coating methods can be used as the coating method used for coating the light diffusion layer. For example, there are a slide bead method, a slide curtain method, an extrusion method, a slot die method, a gravure roll method, an air knife method, a blade coating method, a rod bar coating method and the like.

The light-transmitting metal layer in the present invention means a layer having light-transmitting property and containing a metal. The proportion of the metal contained in the light-transmitting metal layer is preferably 50% by mass or more, more preferably 70% by mass, and particularly preferably 80% by mass. The metal species contained in the light-transmitting metal layer are not limited, and gold, silver, copper, aluminum, nickel, iron, zinc, palladium, rhodium, titanium, chromium, molybdenum, manganese, magnesium, calcium, tantalum, tin, etc. Examples thereof include known metals and alloys made of known metals. Among the above, it is preferable that the light-transmitting metal layer contains silver, aluminum, zinc, and an alloy containing at least one of these, because a light-transmitting metal layer without coloring can be easily obtained.

The method for forming the light-transmitting metal layer is not particularly limited, and is known such as a dry process such as a vacuum vapor deposition method, a sputtering method, an ion plating method, and a CVD method, and a wet process such as electrolytic plating, electroless plating, coating, and printing. A method of selecting a method suitable for the metal species contained in the light-transmitting metal layer and forming the light-transmitting metal layer on the light-transmitting support can be exemplified. Above all, since a uniform and thin light-transmitting metal layer can be easily obtained, it is preferably formed by a dry process, and a vacuum vapor deposition method is preferable. When the light-transmitting metal layer is formed by the vacuum vapor deposition method, a batch type vacuum vapor deposition apparatus may be used, or a continuous vacuum vapor deposition apparatus may be used.

The thickness of the light-transmitting metal layer is not particularly limited, but if it is too thin, the effect of the present invention that it is difficult for the image passing through the transparent screen to be reflected in other places may be reduced, and if it is too thick, it can be seen through. The brightness of the scenery seen through a transparent screen may be reduced. Therefore, the thickness of the light-transmitting metal layer is preferably 1 to 30 nm, preferably 4.5 to 18 nm, and particularly preferably 5.5 to 13 nm. As a method for measuring the thickness of the light-transmitting metal layer, a method of observing the cross section of the light-transmitting metal layer after formation with an electron microscope to measure the thickness, and a method of measuring the metal carrying amount of the light-transmitting metal layer in a certain area are fluorescent. A method of measuring by X-ray analysis method and theoretically calculating the thickness of the light-transmitting metal layer from the metal density and area, a method of measuring the film thickness using a vacuum vapor deposition apparatus equipped with a crystal oscillator type film thickness meter, etc. It can be exemplified.

Generally, the thicker the light-transmitting metal layer, the lower the sheet resistance value. Therefore, as a method of controlling the thickness of the light-transmitting metal layer in the present invention, a method of measuring the sheet resistance value of the light-transmitting metal layer can be substituted. The upper limit of the sheet resistance value of the light-transmitting metal layer is not particularly limited, but in order to obtain a transparent transparent screen laminate in which the image passing through the transparent transparent screen is difficult to be reflected in other places, 100Ω / It is preferably □ or less, more preferably 72 Ω / □ or less, and particularly preferably 46 Ω / □ or less. Further, the lower limit of the sheet resistance value of the light-transmitting metal layer is not particularly limited, but it is preferably 6.5 Ω / □ or more, preferably 9 Ω / □, because it is excellent in the brightness of the scenery seen through the transparent transmissive screen. It is more preferably □ or more, and particularly preferably 12Ω / □ or more. As a method for measuring the sheet resistance value of the light-transmitting metal layer, a method for measuring using a Loresta (registered trademark) -GP / ESP probe manufactured by Mitsubishi Chemical Analytech Co., Ltd. can be exemplified in accordance with JIS K 7194: 1994.

The lower limit of the total light transmittance of the light-transmitting metal layer is not particularly limited, but it is preferably 5% or more, preferably 12% or more, because it is excellent in the brightness of the scenery seen through a transparent transmissive screen. Is more preferable, and 20% or more is particularly preferable. The upper limit of the total light transmittance of the light-transmitting metal layer is not particularly limited, but since it is possible to obtain a transparent transparent screen laminate in which the image passing through the transparent transparent screen is difficult to be reflected in other places, light can be obtained. The total light transmittance measured with the light-transmitting metal layer provided on the transparent support is preferably 50% or less, more preferably 45% or less, and particularly preferably 39% or less. The total light transmittance can be measured using, for example, a haze meter HZ-V3 manufactured by Suga Test Instruments Co., Ltd.

As a method for obtaining the transmissive screen laminate shown in FIG. 1, a surface having a light transmissive metal layer or a surface having no light transmissive metal layer of a light transmissive support having a light transmissive metal layer formed therein. A method of applying the light diffusing layer by the above-mentioned method can be exemplified.

Although not shown in FIGS. 1 and 2, protective layers may be provided above and below the light-transmitting metal layer for the purpose of protecting the light-transmitting metal layer. Examples of the substance contained in the protective layer include metal oxides such as tin oxide, indium tin oxide, indium tin oxide (ITO), zinc oxide, titanium oxide and aluminum oxide, metal nitrides such as silicon nitride and aluminum nitride, and acrylic. Known resins such as resins, epoxy resins, and silicone resins can be exemplified, but are not limited thereto. Further, the light-transmitting metal layer may be subjected to a known rust-preventive treatment such as an organic rust-preventive treatment using a benzotriazole compound, a benzimidazole compound, a mercapto compound or the like, or an inorganic rust-preventive treatment such as chromate treatment.

In the transparent transparent screen laminate of the present invention, a known pressure-sensitive adhesive such as an acrylic pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, and a rubber-based pressure-sensitive adhesive is applied to the pressure-sensitive adhesive layer shown in FIG. Can be used. The pressure-sensitive adhesive layer may contain known additives for pressure-sensitive adhesives such as isocyanate-based cross-linking agents and ultraviolet absorbers. The thickness of the adhesive layer is preferably 1 to 500 μm because it is excellent in light transmission, and more preferably 3 to 250 μm.

In the present invention, when the pressure-sensitive adhesive layer is formed by coating the pressure-sensitive adhesive solution, various known coating methods can be used as the coating method used for coating the pressure-sensitive adhesive solution. For example, a slot die method, a gravure roll method, an air knife method, a blade coating method, a rod bar coating method and the like can be mentioned. Further, a transparent pressure-sensitive adhesive sheet using an acrylic pressure-sensitive adhesive exemplified in JP-A-2011-74308 may be bonded to form a pressure-sensitive adhesive layer.

As a method for obtaining the transmissive screen laminate shown in FIG. 2, an adhesive layer is provided on the light transmissive metal layer of the light transmissive support on which the light transmissive metal layer is formed by the above-mentioned method to form a light diffusion layer. An example thereof is a method of bonding the light-transmitting support to the surface having the light diffusion layer or the opposite surface.

Further, although not shown in FIGS. 1 and 2, the transparent transmissive screen laminate in the present invention is provided on one or both sides of a transparent screen laminate so that it can be easily applied to a substrate to be adhered such as a window. The adhesive layer for construction may be provided, or a separate base material for the purpose of protecting the adhesive layer for construction may be provided on the adhesive layer for construction. When the transparent transparent screen is actually used, the separate base material is peeled off, and the transparent base material is adhered to the adhered base material via the adhesive layer for construction. As the structure of the adhesive layer for construction, the same structure as the above-mentioned adhesive layer can be exemplified, but a different structure may be used. Furthermore, in order to facilitate the release of air when the transparent transparent screen laminate is attached to the substrate to be adhered, the adhesive layer for construction is patterned into dots or blocks and arranged discretely. It is also possible to provide an extra-fine groove by embossing on the adhesive layer for construction.

In the present invention, the separate base material is known as a film, paper, or the like in which the surface to be bonded to the adhesive layer is subjected to a peeling treatment such as silicone resin processing so that the adhesive layer does not remain on the separate base material when peeled off. Substrate can be used. The thickness and haze value are not particularly limited because they are finally peeled off, but from the viewpoint of handling, the thickness is preferably 1.0 to 100 μm, more preferably 5.0 to 50 μm.

The see-through transmissive screen laminate of the present invention may have a hard coat layer on its outermost surface for increasing the strength of the screen.

A protective substrate can be provided to protect the surface of the transparent screen laminate of the present invention. As the protective base material, a known base material such as a film or paper having an adhesive layer adjusted so that an adhesive does not remain on the transparent screen laminated body side that can be seen through when peeled off can be used. Since it is finally peeled off and used, there are no particular restrictions on the thickness and haze value, but from the viewpoint of handling, the thickness is preferably 1.0 to 100 μm, more preferably 5.0 to 50 μm.

In the transmissive transmissive screen laminate of the present invention, regardless of whether the image of the projector is projected from the light diffusing layer side or the light transmissive metal layer side, the image passing through the transmissive transmissive screen can be seen. It is possible to obtain the effect that it is difficult to be reflected in other places, but it is preferable to project from the light diffusion layer side because it is excellent in visibility. In general, in the case of a transmissive screen, when light is irradiated parallel to the perpendicular of the screen, a phenomenon called a hot spot, in which direct light from a so-called projector lens may be visible to the viewer, may occur. It is preferable to use it with a certain angle with respect to the vertical line of.

Hereinafter, the present invention will be described in detail with reference to Examples, but the content of the present invention is not limited to the Examples. In addition, a part represents a mass part of a solid content or a substantial component. Further, the subject means that the ratio of the component exceeds 50% by mass.

<Formation of light-transmitting metal layer 1>
A polyethylene terephthalate film having a thickness of 50 μm (total light transmittance 88%, haze value 2%) was prepared as a light transmissive support. Metallic aluminum was heated and evaporated in a crucible provided in the continuous vacuum vapor deposition apparatus, and aluminum vapor was deposited by contacting one surface of a polyethylene terephthalate film conveyed in the continuous vacuum vapor deposition apparatus with aluminum vapor. In this way, the light-transmitting metal layer 1 containing aluminum was formed. The thickness of the light-transmitting metal layer 1 measured by the crystal oscillator type film thickness meter provided in the continuous vacuum vapor deposition apparatus is 4 nm, and the light measured by using the Loresta-GP / ESP probe manufactured by Mitsubishi Chemical Analytech Co., Ltd. The sheet resistance value of the transmissive metal layer 1 is 86.8 Ω / □, and the total light transmittance including the light transmissive support measured using the haze meter HZ-V3 manufactured by Suga Test Instruments Co., Ltd. is 48%. Met.

<Formation of light-transmitting metal layers 2 to 10>
Similar to the light-transmitting metal layer 1 except that the transport speed of the polyethylene terephthalate film in the continuous vacuum vapor deposition apparatus was adjusted and the thickness of the light-transmitting metal layer containing aluminum was adjusted as shown in Table 1. , The light-transmitting metal layers 2 to 10 were formed. Table 1 shows the sheet resistance value of each light-transmitting metal layer and the total light transmittance including the light-transmitting support.

<Formation of light-transmitting metal layer 11>
A polyethylene terephthalate film having a thickness of 50 μm (total light transmittance 88%, haze value 2%) was prepared as a light transmissive support. Metallic zinc was heated and evaporated in a crucible provided in the continuous vacuum vapor deposition apparatus, and zinc was vapor-deposited by contacting zinc vapor with one surface of a polyethylene terephthalate film conveyed in the continuous vacuum vapor deposition apparatus. In this way, the light-transmitting metal layer 11 containing zinc was formed. The thickness of the light-transmitting metal layer 11 was 11 nm, the sheet resistance value was 30.3 Ω / □, and the total light transmittance including the light-transmitting support was 23%.

<Formation of black pigment layer 1>
A polyethylene terephthalate film (total light transmittance 88%, haze value 2%) having a thickness of 50 μm was prepared as a light-transmitting support, and a black pigment layer coating liquid 1 having the following composition was coated on one surface thereof with a solid content. The film was applied using a slide bead coating device so that the amount was 5.0 g / m ² , and the film was dried by blowing hot air at 50 ° C. to form the black pigment layer 1. The total light transmittance including the light transmittance support was 22%.

<Black pigment layer coating liquid 1>
Acrylic emulsion 100 parts Nonionic surfactant 0.3 parts (polyoxyethylene alkyl ether)
The solid content concentration of all 7 parts of carbon black was adjusted with water so as to be 10% by mass.

<Formation of light diffusion layer 1>
A 100 μm-thick polyethylene terephthalate film (total light transmittance 86%, haze value 4%) was prepared as a light-transmitting support, and the light-diffusing layer coating liquid 1 having the following composition was coated on one surface of the solid content. The film was applied using a slide bead coating device so that the amount was 20.0 g / m ² , and hot air at 10 ° C. and 50 ° C. was sequentially blown to dry the film to form the light diffusion layer 1. When the void volume was measured using a mercury porosity meter (measuring instrument name: Autopore II 9220 manufacturer micromeritics instrument corporation), the void volume was 14 ml / m ² , and the thickness of the cross section of the light diffusion layer was 23 μm as observed by an electron microscope. The porosity was 61%. The light diffusing fine particles are supported on the xerogel.

<Preparation of silica dispersion>
A pre-dispersion solution was prepared by adding 4 parts of a cationic compound (dimethyldiallyl ammonium chloride homopolymer (molecular weight 9,000)) and 100 parts of vapor phase silica (average primary particle diameter 7 nm, specific surface area 300 m ² / g) to water. Then, it was treated with a high-pressure homogenizer to produce a silica dispersion having a solid content concentration of 20%. The average secondary particle size was 80 nm as measured using LA-910 manufactured by HORIBA, Ltd.

<Light diffusion layer coating liquid 1>
Silica dispersion (as silica solid content) 100 parts Polyvinyl alcohol 100 parts (saponification degree 88%, average polymerization degree 3500)
Boric acid 4 parts Nonionic surfactant 0.3 parts (polyoxyethylene alkyl ether)
0.76 parts of light diffusible fine particles (Optobeads (registered trademark) 500S manufactured by Nissan Chemical Co., Ltd., melamine resin / silica composite fine particles (mainly melamine resin), single particle dispersibility, average primary particle diameter 0.5 μm, refraction Rate 1.65)
It was adjusted with water so that the total solid content concentration was 12%.

<Formation of light diffusion layer 2>
A 100 μm-thick polyethylene terephthalate film (total light transmittance 86%, haze value 4%) was prepared as a light-transmitting support, and the following light diffusion layer coating liquid 2 was applied to a solid content coating amount of 25 g / m ² . It was applied using a slide bead application device so as to be. Immediately after application, gelatin was gelled by passing through a cooling zone at 5 ° C. The film surface temperature of the light diffusion layer coating liquid when passing through the cooling zone measured by an infrared thermometer was 13 ° C. Then, warm air of 25 ° C. to 50 ° C. was sequentially blown and dried to form the light diffusion layer 2. The light diffusing fine particles are supported on the gelatin gel.

<Zirconium oxide dispersion>
In water, add 2 parts of a dispersant (Aron (registered trademark) A-6114 manufactured by Toa Synthetic Co., Ltd.) and 100 parts of zirconium oxide (UEP-100 manufactured by Daiichi Rare Element Chemical Industry Co., Ltd., refractive index 2.19). After adding to prepare a preliminary dispersion having a solid content concentration of 20%, the circulation treatment time was adjusted with a media mill (MSC-50 type manufactured by Nippon Coke Industries Co., Ltd.), and the average secondary particle size of zirconium oxide was adjusted. Prepared a zirconium oxide dispersion having a frequency of 117 nm.

<Light diffusion layer coating liquid 2>
Gelatin (IK-3000 manufactured by Nippi Co., Ltd.) was added to water and then dissolved by raising the temperature to 80 ° C. to prepare a gelatin aqueous solution having a solid content concentration of 20%. Next, 100 parts of the gelatin aqueous solution (as gelatin solid content) was cooled to 30 ° C., and then 6 parts of the zirconium oxide dispersion (as zirconium oxide solid content) was added and mixed, and the total solid content concentration was 20% and the liquid temperature was increased. Was adjusted to 25 ° C. to obtain a light diffusion layer coating liquid 2.

<Formation of light diffusion layer 3>
The light diffusing layer 3 was formed in the same manner as the light diffusing layer 1 except that the following light diffusing layer coating liquid 3 was used instead of the light diffusing layer coating liquid 1. The porosity measured in the same manner as in the light diffusion layer 1 was 0%. The light diffusible particles are not supported on the xerogel and gelatin gel.

<Light diffusion layer coating liquid 3>
Acrylic emulsion 100 parts Nonionic surfactant 0.3 parts (polyoxyethylene alkyl ether)
Light diffusing fine particles 0.76 parts (Opto beads 500S)
The total solid content concentration was adjusted with water so as to be 12% by mass.

<Formation of light diffusion layer 4>
In the formation of the light diffusion layer 2 described above, the light transmission support on which the light diffusion layer 1 is formed is used as the light transmission support, and the light diffusion layer coating liquid 2 is coated on the light diffusion layer 1 with a solid content. The light diffusing layer 4 was formed in the same manner except that the light was applied so as to be 5 g / m ² . The light diffusing fine particles are supported on xerogel and gelatin gel.

<Manufacturing of transparent screen laminate 1 that can be seen through>
The following pressure-sensitive adhesive layer coating liquid is applied and dried to a dry coating thickness of 10 μm on the surface of the light-transmitting support having the light-transmitting metal layer 1 on which the above-mentioned light-transmitting metal layer 1 is formed. Formed. Then, the surface of the light-transmitting support on which the light-diffusing layer 1 is formed is laminated so that the surface opposite to the light-diffusing layer 1 is in contact with the adhesive layer, and the translucent transmission having the configuration shown in FIG. 2 (2-1) is possible. A mold screen laminate 1 was obtained.

<Adhesive layer coating liquid>
Acrylic copolymer resin 100 parts Cross-linking agent 4 parts (hexamethylene diisocyanate)
UV absorber 2 parts (2-hydroxy-4-n-octylbenzophenone)
Toluene was adjusted so that the total solid content concentration was 30%.

<Manufacturing of transparent screen laminates 2 to 15 that can be seen through>
Translucent screen laminates 2 to 15 were produced in the same manner as the transparent screen laminate 1 except that the light-transmitting metal layer 1 and the light-diffusing layer 1 were changed as shown in Table 2. ..

<Preparation of transparent screen laminate 16 that can be seen through>
The above-mentioned pressure-sensitive adhesive layer coating liquid is applied and dried to a dry coating thickness of 10 μm on the surface of the light-transmitting support having the light-transmitting metal layer 1 on which the light-transmitting metal layer 1 is formed to form an adhesive layer. did. Then, the surface of the light diffusing layer 1 of the light diffusing support on which the light diffusing layer 1 is formed is laminated so as to be in contact with the adhesive layer, and the transparent transmissive screen laminated having the configuration shown in FIG. 2 (2-2). I got a body 16.

<Preparation of transparent screen laminate 17 that can be seen through>
In the formation of the light diffusing layer 1, the opposite surface of the light transmitting metal layer 1 is similarly changed except that the light transmitting support is changed to the light transmitting support on which the light transmitting metal layer 1 is formed. A light diffusing layer 1 was formed in the above, and a transparent transmissive screen laminate 17 having the configuration shown in FIG. 1 (1-1) was obtained.

<Preparation of transparent screen laminate 18 that can be seen through>
In the formation of the light-transmitting layer 1, light is applied to the surface of the light-transmitting metal layer 1 in the same manner except that the light-transmitting support is changed to the light-transmitting support on which the light-transmitting metal layer 1 is formed. The diffusion layer 1 was formed, and a transparent transparent screen laminate 18 having the configuration shown in FIG. 1 (1-2) was obtained.

<Preparation of transparent screen laminate 19 that can be seen through>
A polyethylene terephthalate film (total light transmittance 88%, haze value 2%) having a thickness of 50 μm is prepared as a light-transmitting support, and the above-mentioned adhesive layer coating liquid is applied to one surface thereof to a dry coating thickness of 10 μm. As a result, it was applied and dried to form an adhesive layer. Then, the surface of the light-transmitting support on which the light-diffusing layer 1 is formed is laminated so that the surface opposite to the light-diffusing layer 1 is in contact with the adhesive layer. I got 19.

<Haze value evaluation>
When the haze values of the transparent screen laminates 1 to 19 that could be seen through were measured using a haze meter HZ-V3 manufactured by Suga Test Instruments Co., Ltd., the haze values were all 50% or less, and the see-through was possible. ..

<Evaluation of reflection of images>
The bottom surface of the transparent screen laminates 1 to 19 in FIGS. 1 and 2 and the acrylic plate were bonded together using a transparent pressure-sensitive adhesive sheet using an acrylic pressure-sensitive adhesive. An ultra-short throw projector (IPSIO® PJWX4130 manufactured by Ricoh Corporation) was set as shown in FIGS. 4 and 6 described above, and an A4 size image was projected from the light diffusion layer side. The evaluation was performed by observing from a position 1.5 m away from the screen on the opposite side of the projector and using the following criteria for the reflection of the image. These results are shown in Table 2. In addition, there was no problem in the image visibility at the time of projector projection of the transmissive screen laminate having the light diffusing layer in which the light diffusing fine particles were carried by the xero gel and / or the gelatin gel.

<Evaluation criteria for image reflection>
The image projected on the wall surface at a height of 3 m opposite to the projector was visually evaluated.
A: There is almost no image reflected on the wall surface B: It is inferior to A above, but there is no image reflected on the wall surface that is of concern C: The image image is slightly reflected on the wall surface D: There is a clear reflection of the image on the wall surface E: The reflection of the image on the wall surface is remarkable

<Brightness evaluation of the scenery seen through the transmissive screen>
The surface of the transparent transparent screen laminates 1 to 19 opposite to the light diffusion layer and the acrylic plate were bonded together using a transparent adhesive sheet using an acrylic adhesive. The evaluation was performed according to the following criteria regarding the scenery seen through the screen by observing from a position 1.5 m from the screen. These results are shown in Table 2.

<Brightness evaluation criteria for scenery seen through a transmissive screen>
The brightness of the scenery seen through the screen was visually evaluated in a room with an illuminance of 200 lux.
A: Sufficiently bright B: Bright C: Slightly bright D: Slightly dark but the scenery is visible E: Dark and the scenery is difficult to see

From the results in Table 2, it can be obtained that the transparent transmissive screen laminate of the present invention makes it difficult for the image projected from the projector to be reflected in a place other than the transmissive screen, and a transparent transmissive screen laminate can be obtained. I understand.

10 Light-transmitting support 11 Light-transmitting support 20 Light-diffusing layer 21 Light-diffusing fine particles 22 Xerogel 23 Gelatin gel 30 Light-transmitting metal layer 40 Adhesive layer 50 Projector 60 Show window 70 100 images projected outside the store Transmissive screen laminate 200 of the present invention Conventional transmissive screen laminate

Claims (1)

On one surface of the light-transmitting support, a light-diffusing layer in which light-diffusing fine particles are carried by xerogel and / or a light-diffusing layer in which light-diffusing fine particles are carried by gelatin gel are provided on the light-transmitting support. A translucent metal layer is provided on either the surface having the light diffusing layer or the surface having no light diffusing layer on the light transmitting support. Transmissive screen laminate.

Images