JP2015068876A - Roll-type transmission screen laminate - Google Patents

Abstract

Provided is a roll-shaped transmission type screen laminate that is easy to attach to an adherend substrate such as glass or a plastic plate, and hardly causes edge floating. A light diffusing layer is provided on at least one surface of a light transmissive support, and an adhesive layer is formed on the surface of the light transmissive support on the light diffusing layer or on the side having no light diffusing layer. And a roll-shaped transmissive screen laminate in which a rectangular sheet-shaped transmissive screen laminate is wound in this order from the side closer to the light-transmissive support, the sheet-like transmissive screen laminate A roll-shaped transmission screen laminate, wherein a long side direction of the body coincides with a width direction of the roll-type transmission screen laminate. [Selection] Figure 1

Description

  The present invention relates to a roll-shaped transmission type screen laminate that is easy to attach to a substrate to be bonded such as glass or a plastic plate with water and hardly causes edge floating.

  At present, so-called rear projection type transmission screens, in which the image projected from the projector is viewed from the opposite side of the projector across the screen, are becoming popular in place of advertising media such as posters, signs, signboards, etc. is there. In recent years, there has been a great deal of attention as digital signage capable of projecting on a large screen digital contents that require no posting, can change contents instantly, and require not only static but also dynamic posting.

  In particular, most of the store's show windows face the road where customers pass, and if they can be replaced with digital signage that uses the window as a large screen, it is very useful as an advertising medium. There is a growing need for so-called transmissive screens for window displays.

  As such a window pasting type transmission type screen, a screen subjected to an adhesive process for providing an adhesive layer is usually used so as to be attached to a window. The pressure-sensitive adhesive layer is provided on the light diffusing layer of the transmissive screen, or is provided on the side having no light diffusing layer. For this reason, such a transmission type screen is generally commercialized as a transmission type screen laminate in which the adhesive layer is protected by a separate substrate. Then, the separate substrate is peeled off and attached to the window.

  In transmissive screens for window displays, there is a need for characteristics that allow large-screen images projected from projectors to be viewed as high-quality images without unevenness at any position in order to maximize their functions as advertisements. Yes.

  As such a transmissive screen, a screen using a polarizing film, a Fresnel lens sheet, a lenticular lens sheet or the like (for example, Patent Document 1), or a screen using light-transmitting beads having high brightness and high contrast (for example, a patent) Document 2) has been proposed. Further, by providing a light diffusion layer containing porous particles, a transmission screen (for example, Patent Document 3) with high resolution, low cost, and high durability is proposed, or contains light diffusion fine particles and a resin binder. Then, by projecting a part of the light diffusing fine particles from the light diffusing layer, the haze is 80% or more, the total light transmittance is 60% or more, and the mirror glossiness of at least one surface is 10% or less. A mold screen (for example, Patent Document 4) has been proposed.

  Such a transmission type screen is usually used as a sheet product having a large size (long side direction is 40 inches or more). However, because of the large size, the sheet is used from the viewpoint of storage, transportation space, and handling. It is commercialized in the state of being wound in a roll shape instead of a shape. On the other hand, when the transmissive screen is attached to the adherend substrate, the adhesive surface of the adherend substrate or the adhesive of the transmissive screen is prevented so that air does not enter between the transmissive screen and the adherend substrate. After spraying water or water containing a surfactant on the bonding surface of the layers and sticking them together, it is generally possible to stick water together with air from the transmission screen side with a squeegee. (Hereinafter, this method of sticking is referred to as water sticking). The above-described roll-shaped transmission screen laminate, which is produced by rolling the transmission-type screen laminate having an adhesive layer and a separate substrate on the light diffusion layer or on the side having no light diffusion layer, into a roll shape. When unwinding and sticking with water, there is a problem that sticking becomes difficult due to curling or edge floating occurs in some cases.

Japanese Patent Laid-Open No. 6-165095 International Publication No. 99/050710 Pamphlet JP 2006-119318 A JP 2005-024942 A

  An object of the present invention is to provide a roll-shaped transmission type screen laminate that is easy to attach to water to be adhered to a substrate to be adhered such as glass or a plastic plate and hardly causes edge floating.

The object is achieved by the following invention.
(1) A light diffusing layer is provided on at least one surface of the light transmissive support, and an adhesive layer and a surface of the light transmissive support on the light diffusing layer or on the side having no light diffusing layer are provided. A roll-shaped transmission-type screen laminate in which a rectangular sheet-shaped transmission-type screen laminate is wound, having a separate substrate in this order from the side closer to the light-transmissive support, and the sheet-like transmission-type screen laminate A roll-shaped transmissive screen laminate, wherein the long side direction of the film coincides with the width direction of the roll-shaped transmissive screen laminate.
(2) The roll-type transmission screen laminate as described in 1 above, wherein the light diffusion layer contains light diffusing fine particles and xerogel.

  According to the present invention, it is possible to provide a roll-shaped transmission screen that is easy to be bonded when water is bonded to a substrate to be bonded such as glass or a plastic plate and hardly causes edge lifting.

Roll-type transmission screen laminate of the present invention Comparative roll-type transmission screen laminate Curl of sheet-like transmission screen laminate after unrolling roll-like transmission screen laminate of the present invention Curling of sheet-shaped transmission screen laminate after unwinding comparative roll-type transmission screen laminate Schematic sectional view showing an embodiment of the roll-shaped transmission screen laminate of the present invention

  The present invention is described in detail below.

  A comparative roll-shaped transmission screen laminate is shown in FIG. As shown in FIG. 2, the comparative roll-shaped transmission screen laminate has the long side direction (W) of the rectangular sheet-like transmission screen laminate 1 </ b> B and the sheet-like transmission screen laminate 1 </ b> B wound up. The winding direction (Y) of the roll body matches. On the other hand, as shown in FIG. 1, the roll-shaped transmission screen laminate of the present invention has a long side direction (W) of a rectangular sheet-shaped transmission screen laminate 1 </ b> B and the sheet-like transmission screen laminate 1 </ b> B. The width direction (X) of the wound roll body coincides. The aspect ratio (ratio) of the length of the long side to the length of the short side of the sheet-shaped transmission screen laminate in the present invention is preferably 1.30 or more, more preferably 1.50 or more. .

  FIG. 3 shows the curl of the sheet-shaped transmission screen laminate after unrolling the roll-type transmission screen laminate of the present invention, and FIG. 4 shows the unrolling of the comparative roll-type transmission screen laminate. The curl of the sheet-like transmission type screen laminate after being applied is shown. In FIG. 4, the sheet-like transmission screen laminate 1 </ b> B after unrolling the comparative roll-like transmission screen laminate has the winding direction (Y) of the roll-like transmission screen laminate 1 </ b> A shown in FIG. 2. 4 is the long side direction (W) in FIG. 4 and a large curl (c2) is generated. On the other hand, in FIG. 3, the sheet-like transmission type screen laminate 1B after unrolling the roll-type transmission screen laminate of the present invention is the roll width direction of the roll-like transmission screen laminate 1A shown in FIG. (X) and the long-side direction (W) of the sheet-like transmission type screen laminate 1B in the figure coincide with each other, curling (c1) is reduced, and it is easy to attach the screen when applying water, and the occurrence of edge floating occurs. Is improved. In the present invention, “match” means that the included angle obtained from the extension line in the width direction (X) of the roll-shaped transmission screen laminate and the long side direction (W) of the sheet-type transmission screen laminate 1B is 2. It means less than °.

  FIG. 5 is a schematic cross-sectional view showing one embodiment of the transmission screen laminate in the present invention. The transmission type screen laminate of the present invention has a configuration in which a light diffusing layer 3 is provided on a light transmissive support 2 as shown in FIG. 5 and an adhesive layer 4 and a separate substrate 5 are sequentially laminated on the other surface (configuration A). Or a structure in which the adhesive layer 4 and the separate substrate 5 are sequentially laminated on the light diffusion layer 3 (before the water application of the configuration B) is also possible. Moreover, although not shown in figure, the protection base material mentioned later is used preferably on the light-diffusion layer 3 of the roll-shaped transmission type screen laminated body of (configuration A) for the purpose of this protection.

  As a procedure for applying water to the sheet-like transmission screen laminate after unrolling the roll-like transmission screen laminate in the present invention, 1. Strip off the separate substrate 5; 2. The exposed adhesive layer 4 and the surface of the adherend substrate 6 are superposed by spraying water or water containing a surfactant, etc. On the other hand, water or water containing a surfactant is sprayed on the light diffusion layer surface (Configuration A in FIG. 5) and the light-transmitting support surface (Configuration B in FIG. 5). By strongly rubbing the light diffusion layer surface (configuration A in FIG. 5) and the light-transmitting support surface (configuration B in FIG. 5), air and water between the adhesive layer 4 and the adherend substrate 6 are removed and pasted. Is done. In addition, it is preferable to peel and use the protection base material mentioned above after affixing on the to-be-adhered base material 6. FIG.

  The roll-shaped transmission type screen laminate in the present invention may be any of those wound with the separate substrate surface inside, or those wound with the separate substrate surface outside, Since the curling of the convex to the adherend substrate side is suppressed at the time of water pasting, it becomes easier to stick, and the occurrence of edge lifting can also be suppressed. A roll-shaped transmission screen laminate is preferable. The diameter at the beginning of winding in the form of a roll (minimum roll diameter, which coincides with the outer diameter of the roll core) is preferably 30 mm or more, more preferably 50 mm or more, and even more preferably 75 mm or more. In addition, since the roll diameter of the roll-shaped transmission type screen laminate increases as the diameter at the beginning of winding increases, the upper limit of the diameter at the beginning of winding is preferably 300 mm or less from the viewpoint of handling. The diameter at the end of winding (maximum roll diameter) when wound into a roll is not particularly limited, and can be appropriately determined from the viewpoint of product weight and storage space.

  In the production process of the rectangular sheet-shaped transmission screen laminate in the present invention, a light diffusing layer is applied to at least one surface of a roll-shaped light-transmitting support, and then the web length is once about 100 m or more. After being wound into a large roll, further subjected to adhesion processing and pasting a separate substrate, the web length was again wound into a large roll having a length of 100 m or more, or in some cases, the web length was 5 to 5. Manufactured by cutting from a roll wound in a small roll of about 50 m. At that time, as the large roll or the small roll described above, the roll body wound with the separate substrate surface inside, or the roll body wound with the separate substrate surface outside. Any of these may be used, but the surface of the separate substrate can be suppressed by suppressing the occurrence of convex curls on the substrate to be bonded side when sticking with water, making it easier to stick and suppressing the occurrence of edge lifting. It is preferable to cut from a roll body wound up with the inside facing. Moreover, the direction of the long side of the rectangular sheet-shaped transmission screen laminate may be cut in any direction so as to coincide with the width direction of the large roll or the small roll body, or the feeding direction, Suppressing the occurrence of convex curls on the adherend substrate side when water is applied, making it easier to apply, and also suppressing the occurrence of edge lifting. It is preferable to cut so as to match.

  It is preferable that the total light transmittance prescribed | regulated by JIS-K7105 exceeds 50% for the transmission type screen affixed on a to-be-adhered base material using the roll-shaped transmission type screen laminated body of this invention. The total light transmittance of the transmission screen of the present invention does not include the values of a separate substrate and a protect substrate described later. This is because when the transmission type screen is mounted on the adherend substrate, the separate substrate and the protect substrate are mounted in a removed state.

  The light diffusing layer in the present invention may be a light diffusing layer as described in the above-mentioned patent document, but the light diffusing layer preferably contains light diffusing fine particles and xerogel. In general, when xerogel is contained, curl tends to increase due to drying shrinkage of the light diffusion layer. In such a case, the present invention works particularly effectively.

  Usually, light diffusing fine particles are suitably used for the light diffusing layer. When the diffusing fine particles are applied to a light-transmitting support, a resin binder for binding the light diffusing fine particles is required. The coating solution containing the light diffusing fine particles and the resin binder is diluted with an organic solvent or water for the purpose of adjusting the viscosity for ensuring the coating property, and applied to the light-transmitting support, dried, or a photocurable resin. It is generally performed to coat an electron beam curable resin as a resin binder without a solvent. In the light diffusing layer applied by such a method, the refractive index of the resin binder and the light diffusing fine particles is generally around 1.50, so the relative refractive index of the light diffusing fine particles with respect to the resin binder is low. Efficient light diffusion is unlikely to occur. On the other hand, the light diffusion layer in which the light diffusing fine particles are supported by the xerogel has xerogel voids (air having a refractive index of 1.0) on the surface of the light diffusing fine particles, and the relative refractive index of the light diffusing fine particles to the air is very high. Therefore, the light diffusing fine particles can be efficiently diffused, and a transmission screen having a wide viewing angle can be obtained.

  The light diffusing fine particles contained in the light diffusing layer in the present invention can be used regardless of organic fine particles and inorganic fine particles as long as they have the ability to diffuse light. From the viewpoint that the angle is very wide and visibility from both sides of the screen is increased, single-particle dispersible light-diffusing fine particles having an average primary particle size of 0.10 μm or more, or an average secondary particle size exceeding 1.0 μm It is preferable to use light diffusing fine particles having the following aggregated particle diameter (hereinafter referred to as aggregated particle dispersible light diffusing fine particles). The upper limit of the average primary particle size of the light diffusing fine particles having single particle dispersibility is preferably 200 μm or less. The upper limit of the average secondary particle diameter of the aggregated particle-dispersible light diffusing fine particles is preferably 200 μm.

  The average primary particle diameter as used in the present invention can be measured by photography using a transmission electron microscope. In the case of single particle dispersible light diffusing fine particles, a laser scattering type particle size distribution meter (for example, Horiba, Ltd.) It can also be measured as the number median diameter using LA910. The average secondary particle size of the aggregated particle-dispersible light diffusing fine particles can be measured as the number median size using a laser scattering type particle size distribution meter (for example, LA910 manufactured by Horiba, Ltd.).

  The light diffusibility of the light diffusing fine particles depends on the specific surface area in addition to the above-described relative refractive index. The specific surface area depends on the average primary particle size of the light diffusing fine particles, and in the case of single particle dispersible fine particles, it can be easily calculated from the average primary particle size and specific gravity.

  The refractive index of the light diffusing fine particles is preferably 1.30 or more. When the refractive index exceeds 1.55, the transmission type screen laminate has a particularly wide viewing angle and excellent visibility from both sides of the screen. Can get.

  Examples of the organic fine particles include acrylic polymer, styrene-acrylic copolymer, vinyl acetate-acrylic copolymer, vinyl acetate polymer, ethylene-vinyl acetate copolymer, chlorinated polyolefin polymer, ethylene-vinyl acetate- Multi-component copolymers such as acrylic, SBR, NBR, MBR, carboxylated SBR, carboxylated NBR, carboxylated MBR, polyvinyl chloride, polyvinylidene chloride, polyester, polyolefin, polyurethane, polymethacrylate, polytetrafluoroethylene, polymethacryl It can be selected widely from conventionally known ones such as methyl acid, polycarbonate, polyvinyl acetal resin, rosin ester resin, episulfide resin, epoxy resin, silicone resin, silicone-acrylic resin, melamine resin, etc. . Moreover, what coated fine particle surfaces, such as a melamine resin and an acrylic resin, with inorganic fine particles, such as a silica, can also be used. Further, even when composite particles composed of such organic fine particles and a small amount of inorganic fine particles (in which the proportion of inorganic fine particles is less than 50% by mass) are used, it can be substantially regarded as organic fine particles and used. Those in which a sulfur atom is introduced into the monomer of these polymers 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 also be used.

  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, zirconium oxide, cerium oxide, Hafnium oxide, tantalum pentoxide, niobium pentoxide, yttrium oxide, chromium oxide, tin oxide, molybdenum oxide, ATO, ITO, oxide glass such as silicate glass, phosphate glass, borate glass, etc. These composite oxides or composite sulfides can also be widely used. In the case of inorganic fine particles having photocatalytic activity, such as titanium oxide and zinc oxide, those having a very thin surface coated with silica, alumina, boron or the like can be used. Further, even when composite particles composed of inorganic fine particles and a small amount of organic polymer (the proportion of organic fine particles is less than 50% by mass) are used, they can be regarded as inorganic fine particles substantially. The inorganic fine particles used as the light diffusing 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 singly or as a mixture of a plurality of types, or both the organic fine particles and the inorganic fine particles can be mixed and used. .

The coating amount of the light diffusing fine particles of the present invention is not particularly limited and varies depending on the relative refractive index of the light diffusing fine particles and the specific surface area per unit mass of the light diffusing fine particles calculated from the average primary particle diameter and specific gravity. 005 to 15.0 g / m ² , preferably 0.01 to 12.0 g / m ² , more preferably 0.03 to 10.0 g / m ² .

  Next, the xerogel which the light-diffusion layer which is a preferable aspect of this invention has is demonstrated.

  The xerogel referred to in the present invention is a gel that has lost its internal solvent due to evaporation or the like and has a network structure with voids, and the porosity of the light diffusion layer in which the light diffusion fine particles are held by the xerogel is 40% or more. Preferably, 50% or more is more preferable.

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

  The xerogel of the present invention 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 be reduced, and sufficient transparency and brightness may not be obtained. The inorganic fine particles constituting the xerogel of the present invention preferably have an average secondary particle diameter of secondary aggregated particle diameter of 500 nm or less. When the average secondary particle diameter exceeds 500 nm, the transparency of the light diffusion layer is lowered, and sufficient transparency and luminance may not be obtained. In the case of inorganic fine particles having a secondary agglomerated particle size, the average primary particle size referred to in the present invention can be measured by photography using a transmission electron microscope, and the average secondary particle size is a laser scattering particle size. It can be measured as the number median diameter using a distribution meter (for example, LA910 manufactured by Horiba, Ltd.).

  Examples of the inorganic fine particles in the present invention include various known fine particles such as amorphous synthetic silica, alumina, alumina hydrate, calcium carbonate, magnesium carbonate, and titanium dioxide. Silica, alumina or alumina hydrate is preferred.

  Amorphous synthetic silica can be roughly classified into wet method silica, gas phase method silica, and others depending on the production method. Wet method silica is further classified into precipitation method silica, gel method silica, and sol method silica according to the production method. Precipitated silica is produced by reacting sodium silicate and sulfuric acid under alkaline conditions, and the silica particles that have grown are agglomerated and settled, and are then commercialized through the steps of filtration, washing, drying, pulverization and classification. Precipitated silica is commercially available, for example, from Tosoh Silica Co., Ltd. as a nip seal and from Tokuyama Co., Ltd. as a Toxeal. Gel silica is produced by reacting sodium silicate and sulfuric acid under acidic conditions. During aging, the microparticles dissolve and reprecipitate so as to bind the other primary particles, so that the distinct primary particles disappear and form relatively hard aggregated particles having an internal void structure. For example, it is commercially available as nip gel from Tosoh Silica Co., Ltd., and as syloid and silo jet from Grace Japan Co., Ltd. The sol method silica is also called colloidal silica, which is obtained by heating and aging a silica sol obtained through metathesis of sodium silicate acid or the like through an ion exchange resin layer. For example, it is commercially available as Snowtex from Nissan Chemical Industries, Ltd. Yes.

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

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

  Vapor phase silica is preferably dispersed in the presence of a cationic compound. Thereby, the light-diffusion layer with a high porosity is obtained, and the effect excellent in visibility is obtained. As a dispersion method, gas phase method silica and a dispersion medium are premixed by ordinary propeller stirring, turbine type stirring, homomixer type stirring, etc., and then a media mill such as a ball mill, a bead mill, a sand grinder, a high pressure homogenizer, an ultrahigh pressure, etc. It is preferable to perform dispersion using a pressure disperser such as a homogenizer, an ultrasonic disperser, a thin film swirl disperser, or the like.

  In the present invention, wet-process silica in which the average secondary particle diameter is pulverized 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 process silica particles used in the present invention are preferably wet process silica particles having an average primary particle diameter of 18 nm or less and an average aggregate particle diameter of 5 to 50 μm, and this is pulverized in the presence of a cationic compound. It is preferable to use the wet process 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 among them, a δ group crystal is preferable. γ-alumina can make primary particles as small as about 10 nm. Usually, secondary particles of thousands to tens of thousands of nanometers are averaged by ultrasonic, high-pressure homogenizer, counter collision type jet crusher, etc. What grind | pulverized the particle diameter to 500 nm or less, Preferably about 20-300 nm can be used.

The alumina hydrate of the present invention is represented by a constitutive formula of Al ₂ O ₃ .nH ₂ O (n = 1 to 3). The 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, hydrolysis of aluminate and the like.

  The above-mentioned alumina and alumina hydrate used in the invention are used in the form of a dispersion dispersed by a known dispersant such as acetic acid, lactic acid, formic acid, nitric acid and the like.

  Two or more kinds of inorganic fine particles may be used in combination from the inorganic fine particles described above. For example, combined use of pulverized wet method silica and vapor phase method silica, combined use of finely pulverized wet method silica and alumina or alumina hydrate, and combined use of vapor phase method silica and alumina or alumina hydrate. . The ratio in the case of this combined use is preferably in the range of 7: 3 to 3: 7 in any aspect.

  In the present invention, the resin binder used together with the inorganic fine particles constituting the xerogel is not particularly limited, but a hydrophilic resin binder having high transparency is preferably used. For example, polyvinyl alcohol, gelatin, polyethylene oxide, polyvinyl pyrrolidone, polyacrylic acid, polyacrylamide, polyurethane, dextran, dextrin, carrageenan (κ, ι, λ, etc.), agar, pullulan, water-soluble polyvinyl butyral, hydroxyethylcellulose, carboxymethylcellulose Etc. Two or more of these hydrophilic resin binders can be used in combination. A preferred hydrophilic resin binder is completely or partially saponified polyvinyl alcohol or cation-modified polyvinyl alcohol. In addition, the said resin binder can be used as a binder of light-diffusion microparticles, even when it does not comprise a xerogel.

  The content of the resin binder constituting the xerogel is preferably 3 to 100% by mass, more preferably 3 to 85% by mass, and further preferably 5 to 70% by mass with respect to the inorganic fine particles constituting the xerogel. . As a result, a wide viewing angle can be obtained. Moreover, it is preferable that the light-diffusion fine particle mentioned above is 0.1-200 mass% with respect to the inorganic fine particle which comprises xerogel, and it is especially preferable that it is 0.3-150 mass%.

  For the light diffusion layer, a hardener may be used together with the resin binder as necessary. Specific examples of the hardener include aldehyde compounds such as formaldehyde and glutaraldehyde, ketone compounds such as diacetyl and chloropentanedione, bis (2-chloroethyl) urea, 2-hydroxy-4,6-dichloro-1 , 3,5-triazine, a compound having a reactive halogen as described in US Pat. No. 3,288,775, divinyl sulfone, a compound having a reactive olefin as described in US Pat. No. 3,635,718, N-methylol compounds as described in US Pat. No. 2,732,316, isocyanates 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 US Pat. No. 611, carbodiimide compounds as described in US Pat. No. 3,100,704 , Epoxy compounds as described in U.S. Pat. No. 3,091,537, halogen carboxaldehydes such as mucochloric acid, dioxane derivatives such as dihydroxydioxane, chromium alum, zirconium sulfate, borax, boric acid and borates. There exist inorganic crosslinking agents etc., and these can be used 1 type or in combination of 2 or more types.

Dry solid coating amount of the light diffusing layer is preferably in the range of 1 to 50 g / ^{m 2,} more preferably in the range of 3~40g / ^{m 2,} in particular in the range of 5 to 30 g / ^{m 2} is preferred. The light diffusion layer further includes a cationic polymer, an antiseptic, a surfactant, a colored dye, a colored pigment, an ultraviolet absorber, an antioxidant, a pigment dispersant, an antifoaming agent, a leveling agent, a fluorescent whitening agent, and a viscosity. Stabilizers, pH adjusters and the like can also be added.

  The light diffusion layer may be composed of two or more layers. In this case, the structures of the light diffusion layers may be the same or different from each other. When there are a plurality of light diffusion layers, the light diffusion fine particles can be contained in at least one light diffusion layer.

  In the present invention, various known coating methods can be used as the coating method used for coating the light diffusion layer. Examples include 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, and a rod bar coating method.

  The light-transmitting support that the roll-shaped transmission screen laminate of the present invention has is not particularly limited as long as it has light-transmitting properties, such as a plate-like one made of glass or plastic, a film-like one, In addition, those provided with a light-transmitting layer such as the light diffusion layer described above can be used. The type of glass is not particularly limited, but in general, oxide glass such as silicate glass, phosphate glass, and borate glass is practical, especially silicate glass and alkali silicate glass. Silicate glass such as soda lime glass, potassium lime glass, lead glass, barium glass, and borosilicate glass is preferred. As the plastic, for example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polypropylene, polyethylene, polyarylate, acrylic, acetylcellulose, polyvinyl chloride, etc. can be used. This is preferable because the mechanical strength is improved. The haze value of the light transmissive support is preferably 30% or less.

  The thickness of the light-transmitting support of the present invention can be appropriately selected depending on the material to be applied, but is 30 μm to 1 mm, preferably 50 μm to 500 μm, considering the ease of roll processing and curling properties. .

  The roll-shaped transmissive screen laminate in the present invention has a light diffusing layer on at least one surface of the light transmissive support, and no light diffusing layer on the light transmissive layer or the light transmissive support is provided. Although the adhesive layer and the separate base material are sequentially provided on the surface, it is also possible to provide a protective base material on the opposite surface of the separate layer as described above. This prevents the light diffusion layer from being damaged by a squeegee or the like when the transmissive screen laminate is affixed to the adherend substrate with water. When using the transmissive screen laminate, the separate substrate is peeled off to adhere the transmissive screen laminate to the adherend substrate. If there is a protect substrate, then the protect substrate is peeled off and used. To do.

  For the pressure-sensitive adhesive layer in the present invention, commonly used synthetic resin adhesives such as acrylic, silicone, urethane and rubber can be used so that necessary adhesion to the substrate to be bonded can be obtained. Used by adjusting. Note that. A known crosslinking agent such as an isocyanate type or an ultraviolet absorber can be appropriately blended in the adhesive layer. The thickness of the pressure-sensitive adhesive layer is preferably 1.0 to 50 μm and more preferably 5.0 to 30 μm in consideration of the effect on curl.

  As a coating method used for coating the adhesive layer in the present invention, various known coating methods can be used. For example, there are a slot die method, a gravure roll method, an air knife method, a blade coating method, a rod bar coating method, and the like. In order to make it easy for air to escape when the transmissive screen laminate is attached to the adherend substrate, it is possible to provide an ultrafine groove by embossing.

  The separation substrate in the present invention is a well-known film or paper having a release treatment such as silicon resin processing applied to the surface to be bonded to the adhesion layer so that the adhesion layer does not remain on the separation substrate when peeled. A substrate can be used. Although the haze value is not particularly limited since it is finally used after being peeled off, the thickness is preferably 1.0 to 100 μm and more preferably 5.0 to 50 μm in consideration of the effect on curling.

  As the protective base material in the present invention, a known base material such as a film or paper having an adhesive layer adjusted so that no adhesive remains on the transmission screen laminate side when peeled can be used. Since the haze value is not particularly limited because it is finally peeled off, the thickness is preferably 1.0 to 100 μm and more preferably 5.0 to 50 μm in consideration of the effect on curling. Further, it is preferable to peel off the protective base material after sufficiently drying a water film that cannot be removed between the adhesive layer and the base material to be adhered so that the attached transmission screen does not peel again.

  Further, the surface of the light transmissive support is easily formed for the purpose of improving the adhesion between the light diffusing layer and the light transmissive support, or for the purpose of improving the adhesion between the adhesive layer and the light transmissive support. An adhesion treatment may be applied, or an easy adhesion layer may be provided separately.

  The roll-shaped transmissive screen laminate of the present invention may have a known antireflection layer having a performance of canceling reflected light by utilizing the light interference action by the layer interface on at least one surface. Thereby, the image projected from the projector can be clearly seen. As the antireflection layer, for example, a single layer provided with a highly transparent low refractive index layer such as silicon oxide or lithium fluoride so as to be an optical thin film having a quarter wavelength of the main wavelength, or such A material in which a high refractive index layer such as titanium oxide or zinc oxide is appropriately laminated on a low refractive index layer can be used.

  Furthermore, it is possible to provide a known hard coat layer, diffusion preventing layer or antistatic layer for increasing the strength of the screen on at least one outermost surface.

  The transmissive screen attached to the adherend substrate by the roll-shaped transmissive screen laminate of the present invention can be used by projecting the image of the projector from either the light diffusion layer side or the opposite side. is there.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, the content of this invention is not restricted to an Example. In addition, a part represents the mass part of solid content or a substantial component.

Example 1
On one side of a transparent polyethylene terephthalate film (haze value 4%) having a thickness of 100 μm as a light-transmitting support, a light diffusion layer coating solution 1 having the following composition is applied so that the solid content coating amount is 20.0 g / m ^2. Apply using a slide bead coating device, spray hot air of 10 ° C and 50 ° C in order and dry to provide a light diffusing layer, and the other side without a light diffusing layer on a plastic roll core with an outer diameter of 175 mm Wound 500 m so that the surface was inside. The aggregated particle-dispersible light-diffusing fine particles were used by being previously dispersed with a homomixer using water as a dispersion medium. Moreover, when the void volume was measured using a mercury porosimeter (measuring instrument name: Autopore II 9220, manufacturer micromeritics instrument corporation), the thickness was 19.2 ml / m ² , and the thickness of the light diffusion layer was 34 μm as measured by an electron microscope. The void ratio was 55%.

<Preparation of silica dispersion>
After adding 4 parts of dimethyldiallylammonium chloride homopolymer (molecular weight 9,000) and 100 parts of vapor phase process silica (average primary particle diameter 7 nm, specific surface area 300 m ² / g) to water to prepare a preliminary dispersion, a high pressure homogenizer To prepare a silica dispersion having a solid concentration of 20%. The average secondary particle diameter was 80 nm when measured using LA910 manufactured by HORIBA, Ltd.

<Light diffusion layer coating solution 1>
Silica dispersion (as silica solid content) 150 parts Polyvinyl alcohol 100 parts (saponification degree 88%, average polymerization degree 3500)
Boric acid 16 parts Nonionic surfactant 0.3 parts (Polyoxyethylene alkyl ether)
Aggregated particle dispersible light diffusing fine particles 150 parts (P-78A: manufactured by Mizusawa Chemical Co., Ltd., average secondary particle size 6.0 μm, specific surface area 360 m ² / g, refractive index 1.45)
12 parts of light diffusing fine particles having a single particle dispersibility (Optobead 500S: manufactured by Nissan Chemical Industries, Ltd., silica, melamine resin composite fine particles (melamine resin mainly), average primary particle size 0.5 μm, true specific gravity 2.2, Refractive index 1.65)
The total solid content concentration was adjusted with water so as to be 10%.

  Subsequently, the following adhesive layer coating solution is applied and dried on the other surface of the light-transmitting support so as to have a dry coating thickness of 10 μm, and then a separation treatment is performed by silicon resin processing as a separate substrate. The transparent polyethylene terephthalate film (hazy value 3%) having a thickness of 25 μm was adhered and bonded, and was wound around a plastic roll core having an outer diameter of 175 mm so that the surface of the separate substrate was on the inner side. Subsequently, a transparent polyethylene terephthalate film having a thickness of 16 μm (having a haze value of 3%) that has been peeled off with a silicon resin adhesive layer as a protective base material is closely bonded onto the light diffusion layer, and a plastic having an outer diameter of 175 mm. It was wound around a roll core made of 400 m so that the surface of the separate substrate was on the inside. Subsequently, after slitting to a width of 1524 mm, the roll body was finished by winding 10 m on a paper roll core having an outer diameter of 84 mm so that the surface of the separate substrate was on the inside. Subsequently, from this roll body, the aspect ratio is 1.78 (long side: short side = 16: 9) so that the width direction of the roll body and the long side direction of the sheet-like transmissive screen laminate coincide. A 60-inch sheet (1,329 mm × 748 mm) was cut to obtain a rectangular sheet-shaped transmission screen laminate. Finally, a separation base is formed on a paper roll core having an outer diameter of 84 mm so that the long side direction (side of 1,329 mm) of the rectangular sheet-shaped transmission screen laminate coincides with the width direction of the roll body. The roll-shaped transmission type screen laminate of Example 1 was produced by winding the material surface inside. In this roll-shaped transmissive screen laminate, the total light transmittance of the transmissive screen before bonding the protect substrate and the separate substrate was 70%.

<Adhesive layer coating solution>
Acrylic copolymer resin 100 parts Crosslinker 4 parts (hexamethylene diisocyanate)
UV absorber 4 parts (2-hydroxy-4-n-octylbenzophenone)
Adjustment was made with toluene so that the total solid content concentration was 30%.

(Example 2)
Except that the light diffusion layer coating solution 1 of Example 1 was changed to the following light diffusion layer coating solution 2 and applied and dried so that the solid content coating amount was 13.0 g / m ^2. A roll-shaped transmission screen laminate of Example 2 was produced. In this transmissive screen laminate, the total light transmittance of the transmissive screen before bonding the separate substrate was 70%, and the porosity of the light diffusion layer measured in the same manner as in Example 1 was 3. %Met.

<Light diffusion layer coating solution 2>
Alkali-treated gelatin 100 parts Nonionic surfactant 0.3 parts (polyoxyethylene alkyl ether)
150 parts of gel method silica (P-78A: manufactured by Mizusawa Chemical Co., Ltd., average secondary particle diameter 6.0 .mu.m, specific surface area 360 m ² / g, refractive index 1.45)
The total solid content concentration was adjusted with water so as to be 10%.

(Example 3)
In the production of the roll-shaped transmission type screen laminate of Example 1, the example was carried out in the same manner as in Example 1 except that the winding direction around the last roll core was opposite (separate substrate surface was outside). 3 roll-shaped transmission type screen laminate.

Example 4
In the production of the roll-shaped transmission type screen laminate of Example 2, the example was carried out in the same manner as in Example 2 except that the winding direction around the last roll core was opposite (separate substrate surface was outside). 4 roll-shaped transmission type screen laminate.

(Comparative Example 1)
In the production of the roll-shaped transmission screen laminate of Example 1, the winding was performed so that the long side direction (side of 1,329 mm) of the rectangular sheet-shaped transmission screen laminate coincided with the winding direction of the roll body. As a result, a roll-shaped transmission screen laminate of Comparative Example 1 was obtained.

(Comparative Example 2)
In the production of the roll-shaped transmission screen laminate of Example 2, the long sheet direction (1,329 mm side) of the rectangular sheet-shaped transmission screen laminate and the winding direction of the roll body were matched. As a result, a rolled transmission screen laminate of Comparative Example 2 was obtained.

(Comparative Example 3)
In the production of the roll-shaped transmission screen laminate of Example 3, the winding was performed so that the long side direction (side of 1,329 mm) of the rectangular sheet-shaped transmission screen laminate coincided with the winding direction of the roll body. As a result, a rolled transmission screen laminate of Comparative Example 3 was obtained.

(Comparative Example 4)
In the production of the roll-shaped transmission screen laminate of Example 4, the winding was performed so that the long side direction (side of 1,329 mm) of the rectangular sheet-shaped transmission screen laminate coincided with the winding direction of the roll body. As a result, a rolled transmission screen laminate of Comparative Example 4 was obtained.

  The obtained roll-type transmission screen laminates of Examples 1 to 4 and Comparative Examples 1 to 4 were stored in a warehouse at 25 ° C. and 50% RH for 2 weeks, and then evaluated as follows. The results are shown in Table 1.

<Ease of pasting the screen>
Water with a surfactant was sprayed onto the adhesive surface of a 60-inch transmission screen laminate having an aspect ratio of 16: 9 from which a separate substrate was peeled off as a 5 mm-thick glass surface as an adherend substrate, and both were brought into close contact with each other. Thereafter, water containing a surfactant was sprayed on the outermost surface of the transmissive screen (the surface of the protected substrate), and the water was scraped out with a rubber squeegee to completely attach both of them. The ease of sticking the screen at that time was evaluated according to the following criteria.
◎: The screen was flat or slightly curled, and the screen could be attached easily. ○: The curl of the screen was between the ◎ level and the following △ level, but there was no problem △: Screen Has a large curl and was difficult to paste ×: The screen had a remarkably large curl and was difficult to paste

<Edge floating>
With respect to the transmission type screen attached to the glass in the above <Ease of screen attachment>, the screen was dried for one week in a normal temperature and humidity environment, and then the floating of the edge of the screen was visually evaluated according to the following criteria.
◎: Screen edge lift did not occur ○: Screen edge lift occurred partially, but it was a level that did not become a problem △: Screen edge lift occurred, at a problematic level Yes x: The edge of the screen was remarkably generated, and it was a level that caused a considerable problem

  From the results of Table 1, the roll-shaped transmission screen laminate of the present invention provides a transmission screen that is easy to apply when water is applied to an adherend substrate such as glass or a plastic plate and hardly causes edge lifting. I understand that. On the other hand, regarding the transmissive screen dried for one week in the above <edge floating> evaluation, the digital projector (MP515ST, manufactured by BenQ) was applied to the transmissive screen pasted on the glass after peeling off the protective substrate. ) Was actually projected from the transmissive screen side, and the viewing angle of the image projected on the transmissive screen from the opposite side of the projector was observed. Examples 1 and 3 containing xerogel, Comparative Example 1 The transmission screens of No. 3 and No. 3 had a wider viewing angle than the other transmission screens.

DESCRIPTION OF SYMBOLS 1A Roll-like transmissive screen laminated body 1B Sheet-like transmissive screen laminated body 1 Transparent screen laminated body 2 Light transmissive support body 3 Light diffusion layer 4 Adhesive layer 5 Separate base material 6 Adhesive base material

Claims (2)

  A light diffusing layer is provided on at least one surface of the light transmissive support, and an adhesive layer and a separate substrate are formed on the light diffusing layer or on the surface of the light transmissive support on the side not having the light diffusing layer. In this order from the side close to the light-transmitting support, a roll-shaped transmission screen laminate on which a rectangular sheet-shaped transmission screen laminate is wound, the long side of the sheet-like transmission screen laminate A roll-shaped transmission screen laminate, wherein the direction and the width direction of the roll-type transmission screen laminate coincide with each other.   The roll-shaped transmission type screen laminate according to claim 1, wherein the light diffusion layer contains light diffusing fine particles and xerogel.