JP6334055B2 - Sheet-like transparent molded body, transparent screen including the same, and video projection system including the same - Google Patents

Description

  The present invention is a sheet-like transparent molded article that has both the visibility of the projection light and the visibility of the transmitted light by anisotropically scattering and reflecting the projection light, and further having an infrared shielding effect, and a transparent body including the same The present invention relates to a screen and a video projection system including the screen.

  Conventionally, a combination of a Fresnel lens sheet and a lenticular lens sheet has been used as a projector screen. In recent years, there has been an increasing demand to project and display product information, advertisements, and the like while maintaining transparency on a show window of a department store or a transparent partition of an event space. In the future, it is said that the demand for transparent screens used for head-up displays, wearable displays and the like will increase.

  However, since the conventional projector screen has low transparency, there is a technical problem that it cannot be applied to a transparent partition or the like. Therefore, various screens that can realize high transparency have been proposed. For example, on a plastic film or sheet, an ink containing 7 parts by weight of aluminum scales and 25 parts by weight of pearl pigment scales coated with titanium dioxide using mica as a base is printed or coated, and a light reflecting layer is formed. A reflection type screen characterized by the above has been proposed (see Patent Document 1). Moreover, the light which contains 10-80 weight of non-feeling type scale-like aluminum paste as a light reflecting agent with respect to 100 weight part of binder resin on a board | substrate, and also contains 50 weight% or more of light diffusing agent with respect to a light diffusing agent. A reflective screen for a projector characterized by providing a diffusion layer has been proposed (see Patent Document 2). Furthermore, a reflective screen has been proposed in which a light diffusing layer formed of a continuous layer made of a transparent resin and a dispersion layer made of anisotropic transparent particles is laminated on a light reflecting substrate. (See Patent Document 3).

Japanese Patent Laid-Open No. 3-119334 JP-A-10-186521 JP 2004-54132 A

  However, the present inventors have found that Patent Documents 1 to 3 have the following technical problems. In the reflection type screen described in Patent Document 1, since the scaly particles are coated on the substrate surface at a high concentration, the image cannot be clearly seen due to the glare of the coating film, and a white vinyl chloride film is used for the substrate. Therefore, there is a technical problem that fluoroscopy is impossible. The reflective screen described in Patent Document 2 contains a scaly aluminum paste at a high concentration of 10 to 80 weight as a light reflector, and has a technical problem that the obtained film cannot be seen through. In the reflective screen described in Patent Document 3, anisotropic transparent particles dispersed in a dispersion layer are non-metallic particles of mica, talc, and montmorillonite. In particular, since talc and montmorillonite are clay-based particles, regular reflectance is obtained. However, there is a technical problem that it cannot be suitably used as a reflective transparent screen. Furthermore, when the screens described in Patent Documents 1 to 3 are used for, for example, a window glass of a car or a house, the temperature rise is different between a place where the sunlight hits and a place where the sunlight does not hit, so the glass breaks (heat cracking), etc. In addition, there is a risk that yellowing due to deterioration of the resin, generation of cracks, reduction in strength, etc. may occur due to long-term sunlight. In addition, the transmission of infrared rays increases the temperature in the vehicle or the room, which is not preferable from the viewpoint of energy saving.

  The present invention has been made in view of the above technical problems, and its purpose is excellent in the visibility of projection light and transmitted light, wide viewing angle, excellent visibility, and the effect of shielding heat and ultraviolet rays. It is providing the sheet-like transparent molding which has this. Another object of the present invention is to provide a transparent screen provided with the sheet-like transparent molded body, a sheet-like transparent molded body, or an image projection system provided with the transparent screen and a projection device. The transparent screen here may be a transmissive screen or a reflective screen. As shown in FIG. 3, a transmissive screen is a screen on which a projection device is provided on the opposite side of the viewer from the screen so that an image can be seen. A reflective screen is visually recognized as shown in FIG. A screen on which a projection device is provided on the person side (the same side as the viewer with respect to the screen) and the image can be viewed.

  As a result of intensive studies to solve the above technical problems, the present inventors have found that at least one of infrared shielding fine particles and ultraviolet shielding agents, at least one of glittering flaky fine particles and substantially spherical fine particles. It was found that by dispersing one of them in a resin to form a transparent light scattering layer, the above technical problem was solved, and a sheet-like transparent molded body that can be suitably used for a transparent screen was obtained. The present invention has been completed based on such findings.

That is, according to one aspect of the present invention,
A sheet comprising a transparent light scattering layer comprising a resin, at least one of infrared shielding fine particles and ultraviolet shielding agent, and at least one of glittering flaky fine particles and substantially spherical fine particles A transparent molded body is provided.

  In the aspect of the present invention, the infrared shielding fine particles are at least one selected from the group consisting of lanthanum hexaboride, cesium tungsten oxide, indium tin oxide, tin antimony oxide, titanium oxide, zinc oxide, and palladium. Preferably there is.

  In an aspect of the present invention, the average primary particle diameter of the infrared shielding fine particles is 1 nm to 10 μm, and the content of the infrared shielding fine particles is 0.0001 to 5.0 with respect to the resin. It is preferable that it is mass%.

  In the embodiment of the present invention, the ultraviolet shielding agent is preferably a metal ultraviolet shielding agent or an organic ultraviolet shielding agent.

  In the aspect of the present invention, the organic ultraviolet shielding agent is preferably at least one selected from the group consisting of a benzotriazole ultraviolet absorber, a triazine ultraviolet absorber, and a benzophenone ultraviolet absorber.

  In the aspect of this invention, it is preferable that content of the said ultraviolet shielding agent is 0.0001-5.0 mass% with respect to the said resin.

  In an aspect of the present invention, the glittering flaky fine particles are selected from the group consisting of aluminum, silver, platinum, gold, titanium, nickel, tin, tin-cobalt alloy, indium, chromium, aluminum oxide, and zinc sulfide. Metal-based particles, a glittering material in which glass or metal oxide is coated on glass, or a glittering material in which natural or synthetic mica is coated with metal or metal oxide. Is preferred.

  In an aspect of the present invention, the content of the glittering flaky fine particles is 0.0001 to 5.0% by mass with respect to the resin, and the average diameter of the primary particles of the glittering flaky fine particles is It is preferable that it is 0.01 nm-100 micrometers.

  In the aspect of the present invention, the specular reflectance of the glittering flaky fine particles is preferably 12% or more.

  In the aspect of the present invention, the substantially spherical fine particles are at least one selected from the group consisting of zirconium oxide, cerium oxide, barium titanate, strontium titanate, diamond, a crosslinked acrylic resin, a crosslinked styrene resin, and silica. Preferably there is.

  In an aspect of the present invention, the median diameter of the primary particles of the substantially spherical fine particles is 0.1 to 100 nm, and the content of the substantially spherical fine particles is 0.0001 to 2.0 with respect to the resin. It is preferable that it is mass%.

  In the aspect of the present invention, the sheet-like transparent molded body preferably has a haze of 37% or less.

  In the aspect of the present invention, the sheet-like transparent molded body preferably has a shielding coefficient of 0.90 or less.

  In the aspect of the present invention, it is preferable that the sheet-like transparent molded body has a image clarity of 70% or more.

  According to the other aspect of this invention, the member for buildings provided with said sheet-like transparent molded object is provided.

  According to the other aspect of this invention, the member for vehicles provided with said sheet-like transparent molded object is provided.

  According to another aspect of the present invention, there is provided a transmission type transparent screen provided with the above sheet-like transparent molded body.

  According to the other aspect of this invention, the reflection type transparent screen provided with said sheet-like transparent molded object is provided.

  According to another aspect of the present invention, there is provided a video projection system including the sheet-like transparent molded body or the transmissive transparent screen, and a projection device.

  According to another aspect of the present invention, there is provided a video projection system including the sheet-like transparent molded body or the reflective transparent screen, and a projection device.

  When used as a transparent screen, the sheet-like transparent molded product according to the present invention can project a clear image on the transparent screen by anisotropically reflecting and reflecting the projection light without impairing the transparency. Excellent viewing angle. That is, the sheet-like transparent molded body according to the present invention can achieve both the visibility of the projected light and the visibility of the transmitted light, and can be suitably used as a transmissive transparent screen, and also suitably used as a reflective transparent screen. Can do. In addition, the sheet-like transparent molded body according to the present invention reflects an infrared ray to cause an internal temperature rise or a thermal crack of the glass when it is pasted and used in a place where sunlight is incident, such as a building or a car window glass. Further, yellowing due to deterioration of the resin, generation of cracks, reduction in strength, and the like can be suppressed.

It is a cross-sectional schematic diagram of the thickness direction of one Embodiment of the sheet-like transparent molded object by this invention. It is a cross-sectional schematic diagram of the thickness direction of one Embodiment of the sheet-like transparent molded object by this invention. 1 is a schematic diagram illustrating an embodiment of a transparent screen and a video projection system according to the present invention.

<Sheet-like transparent molded body>
The sheet-like transparent molded body according to the present invention includes a transparent light scattering layer, and may further include other layers such as a protective layer, a base material layer, an adhesive layer, and an antireflection layer. The sheet-like transparent molded body according to the present invention can be seen through and can be suitably used as a transparent screen. The sheet-like transparent molded body according to the present invention has excellent visibility of projection light by anisotropically reflecting and reflecting the projection light, wide viewing angle, high transparency, and excellent visibility of transmitted light. It is. Moreover, a sheet-like transparent molded object can also suppress the indoor temperature rise and the thermal crack of glass by containing infrared shielding fine particles. Furthermore, the sheet-like transparent molded body can prevent yellowing due to deterioration of the resin as a base material, generation of cracks, and reduction in strength by containing an ultraviolet shielding agent. Such a sheet-like transparent molded body can be suitably used as a reflective screen used for a head-up display, a wearable display, and the like. In the present invention, the term “transparent” is sufficient as long as the transparency can be realized according to the application, and includes “translucent”.

  FIG. 1 shows a schematic cross-sectional view in the thickness direction of an embodiment of a sheet-like transparent molded body according to the present invention. The transparent sheet-like molded body includes a transparent light scattering layer 14 in which infrared shielding fine particles 13, glittering flaky fine particles 11, and substantially spherical fine particles 12 are dispersed in a resin 10. In such a sheet-like transparent molded body, the viewer 15 can visually recognize the scattered light 17 by anisotropically scattering the projection light 16. Note that 13 may be an ultraviolet shielding agent, and may contain both infrared shielding fine particles and an ultraviolet shielding agent.

  FIG. 2 shows a schematic cross-sectional view in the thickness direction of an embodiment of the sheet-like transparent molded body according to the present invention. The sheet-like transparent molded body is provided with a transparent light scattering layer 26 in which infrared shielding fine particles 23, bright flaky fine particles 21 and substantially spherical fine particles 22 are dispersed in a resin 20, and transparent light scattering. The adhesive layer 24 and the base material layer 25 are provided on both surfaces of the layer 26. In such a sheet-like transparent molded body, the viewer 29 can visually recognize the scattered light 28 by anisotropically scattering the projection light 27. In addition, 23 may be an ultraviolet shielding agent and may contain both infrared shielding fine particles and an ultraviolet shielding agent.

  The sheet-like transparent molded body preferably has a haze value of 50% or less, more preferably 1% or more and 40% or less, more preferably 1.3% or more and 30% or less, and even more preferably 1. 5% or more and 20% or less. The total light transmittance is preferably 70% or more, more preferably 75% or more, still more preferably 80% or more, and even more preferably 85% or more. The sheet-like transparent molded body preferably has a diffuse transmittance of 1.5% to 60%, more preferably 1.7% to 55%, and more preferably 1.9% to 50%. Or even more preferably 2.0% or more and 45% or less. If the haze value and the total light transmittance are within the above ranges, the transparency is high and transmission visibility can be further improved. If the diffuse transmittance is within the above ranges, the incident light is efficiently diffused. Since the viewing angle can be further improved, the performance as a screen is excellent. In the present invention, the haze value, total light transmittance, and diffuse transmittance of the sheet-like transparent molded product are JIS-K using a turbidimeter (manufactured by Nippon Denshoku Industries Co., Ltd., product number: NDH-5000). It can be measured according to -7361 and JIS-K-7136.

The sheet-like transparent molded body preferably has a reflected front luminous intensity of 3 or more and 60 or less, more preferably 4 or more and 50 or less, and further preferably 4.5 or more and 40 or less. In addition, the sheet-like transparent molded article has a transmission front luminous intensity (× 1000) of preferably 1.5 or more, more preferably 2.0 or more, and even more preferably 3.0 or more and 50 or less. . When the reflection front luminous intensity and transmission front luminous intensity (× 1000) of the sheet-like transparent molded body are within the above ranges, the brightness of the reflected light is high and the performance as a reflective screen is excellent. In the present invention, the reflected light intensity and the reflected light intensity improvement rate of the sheet-like transparent molded body are values measured as follows.
(Reflected front brightness)
The measurement was performed using a variable angle photometer (Nippon Denshoku Industries Co., Ltd., product number: GC5000L). The incident angle of the light source was set to 45 degrees, and the reflected light intensity in the 0 degree direction when a standard white plate with a whiteness of 95.77 was placed on the measurement stage was set to 100. At the time of sample measurement, the incident angle of the light source was set to 15 degrees, and the intensity of reflected light in the 0 degree direction was measured.
(Transmission front brightness)
The measurement was performed using a variable angle photometer (Nippon Denshoku Industries Co., Ltd., product number: GC5000L). The incident angle of the light source was set to 0 degree, and the transmitted light intensity in the 0 degree direction when nothing was placed on the measurement stage was set to 100. In the sample measurement, the incident angle of the light source was set to 15 degrees, and the intensity of transmitted light in the 0 degree direction was measured.

The sheet-like transparent molded body preferably has a shielding coefficient of 0.40 or more and 0.90 or less, more preferably 0.50 or more and 0.80 or less, and further preferably 0.65 or more and 0.80 or less. It is. When the shielding coefficient is within the above range, the infrared shielding effect and the internal temperature rise suppressing effect are excellent, and the transparency of the sheet-like transparent molded body can be realized. The shielding coefficient is an index of the difficulty of heating the glass with the film attached, and is a relative value when the raw glass is set to 1. Therefore, the smaller the numerical value of the shielding coefficient, the harder it is to crack. In the present invention, the shielding coefficient of the sheet-like transparent molded body is a value measured as follows.
(Shielding coefficient)
It measured based on JIS A5759 using the ultraviolet visible near infrared spectrophotometer (Corporation | KK Shimadzu Corp. make, model number UV-2600).

The said sheet-like transparent molded object has the outstanding light resistance by including a ultraviolet-ray shielding agent. Light resistance can be evaluated by the amount of change in film property values before and after light irradiation. As a film physical property value, b ^* value that is an index of yellowness, MIT folding resistance number that is an index of mechanical strength, and the like are used. For example, using a xenon weather meter (Toyo Seiki Seisakusho Atlas Ci4000), the sheet-like transparent molded body is irradiated with light, and the light resistance can be evaluated as follows. The b ^* value, which is an index of yellowishness, and the number of MIT folding resistances are values measured as follows.
(B ^* value)
It measured using Nippondenshoku Industries Co., Ltd. Spectrophotometer SD6000.
(MIT folding resistance times)
The number of MIT folding resistances can be determined using a BE-201 MIT bending resistance tester manufactured by Tester Sangyo Co., Ltd. as follows. The BE-201 MIT bending resistance tester manufactured by Tester Sangyo Co., Ltd. is also called an MIT folding resistance tester. The measurement conditions are a load of 200 g, a bending point tip R of 0.38, a bending speed of 175 times / minute, a bending angle of 135 ° on the left and right, and a width of the film sample of 15 mm. And the average value of the number of times of bending until it is broken when it is repeatedly bent in the conveying direction of the sheet-like transparent molded body and the number of times of bending until it is broken when it is repeatedly bent in the width direction is the number of times of MIT folding resistance. And

Light fastness, the ^{b *} value after light irradiation before the light irradiation ^{b *} value ^{(b * 1)} subtracted from the value ^{Δb * (= b * 1 -b} *) and the MIT folding endurance times before and after light irradiation It can be evaluated from the subtraction value ΔMIT (= MIT before light irradiation−MIT after light irradiation). The sheet-like transparent molded product has a yellowish subtraction value Δb ^* before and after light irradiation at an irradiance of 60 W / m ² for 600 hours, preferably 0.10 or less, more preferably 0.08 or less. More preferably, it is 0.05 or less. In addition, the sheet-like transparent molded body has an MIT folding resistance number subtraction value ΔMIT before and after light irradiation at an irradiance of 60 W / m ² for 600 hours, preferably 2000 or less, more preferably 1500 or less, More preferably, it is 1000 or less. As the values of Δb ^* and ΔMIT are smaller, there is no deterioration due to light irradiation and the light resistance is superior.

  The sheet-like transparent molded body preferably has an image clarity of 70% or more, more preferably 75% or more, still more preferably 80% or more, still more preferably 85% or more, and particularly preferably. Is 90% or more. If the image clarity of the transparent screen film is within the above range, the image seen through the transparent screen becomes very clear. In the present invention, the image clarity is a value of image definition (%) when measured with an optical comb width of 0.125 mm in accordance with JIS K7374.

  Although the thickness of the said sheet-like transparent molded object is not specifically limited, From a viewpoint of a use, productivity, a handleability, and a conveyance property, Preferably it is 0.1 micrometer-20 mm, More preferably, it is 0.00. It is 5 micrometers-15 mm, More preferably, they are 1 micrometer-10 mm. In the present invention, the “sheet-like transparent molded article” refers to a molded article having various thicknesses such as a film, a sheet, a coating film formed by coating on a substrate, and a plate (plate-like molded article). Include.

(Transparent light scattering layer)
The transparent light scattering layer comprises a resin, at least one of infrared shielding fine particles and an ultraviolet shielding agent, and at least one of glittering flaky fine particles and substantially spherical fine particles. By using at least one of the following glittering flaky fine particles and substantially spherical fine particles, light is anisotropically scattered and reflected in the transparent light scattering layer, and the viewing angle and the luminance can be improved.

  Although the thickness of a transparent light-scattering layer is not specifically limited, From a viewpoint of a use, productivity, a handleability, and a conveyance property, Preferably it is 0.1 micrometers-20 mm, More preferably, it is 0.2 micrometers- 15 mm, and more preferably 1 μm to 10 mm. The transparent light scattering layer may be a sheet-like transparent molded body or a coating film formed on a substrate made of glass or resin. The transparent light scattering layer may have a single-layer structure, and a multilayer structure in which two or more layers are laminated by coating or the like, or two or more sheet-like transparent molded bodies are bonded together with an adhesive or the like. It may be.

(resin)
As the resin for forming the transparent light scattering layer, it is preferable to use a highly transparent resin in order to obtain a highly transparent sheet-like transparent molded body. Highly transparent resins include acrylic resins, acrylic urethane resins, polyester acrylate resins, polyurethane acrylate resins, epoxy acrylate resins, polyester resins, polyolefin resins, urethane resins, epoxy resins, and polycarbonate resins. Resin, Cellulose resin, Acetal resin, Vinyl resin, Polystyrene resin, Polyamide resin, Polyimide resin, Melamine resin, Phenol resin, Silicone resin, Polyarylate resin, Polyvinyl alcohol resin, Polychlorinated Thermoplastic resins such as vinyl resins, polysulfone resins, and fluorine resins, thermosetting resins, ionizing radiation curable resins, and the like can be used. Among these, the use of a thermoplastic resin is preferable from the viewpoint of the moldability of the sheet-like transparent molded body, but is not particularly limited. As the thermoplastic resin, acrylic resins, polyester resins, polyolefin resins, vinyl resins, polycarbonate resins, and polystyrene resins are preferably used. Polymethyl methacrylate resin, polyethylene terephthalate resin, polyethylene naphthalate resin More preferably, polypropylene resin, cycloolefin polymer resin, cellulose acetate propionate resin, polyvinyl butyral resin, polycarbonate resin, and polystyrene resin are used. These resins can be used alone or in combination of two or more. Examples of the ionizing radiation curable resin include acrylic, urethane, acrylic urethane, epoxy, and silicone resins. Among these, those having an acrylate-based functional group, such as relatively low molecular weight polyester resins, polyether resins, acrylic resins, epoxy resins, urethane resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, many Monofunctional monomers such as ethyl (meth) acrylate, ethylhexyl (meth) acrylate, styrene, methylstyrene, N-vinylpyrrolidone as oligomers or prepolymers such as (meth) arylate of polyfunctional compounds such as polyhydric alcohols and reactive diluents And polyfunctional monomers such as polymethylolpropane tri (meth) acrylate, hexanediol (meth) acrylate, tripropylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate Preferred are those containing a relatively large amount of rate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, etc. . Further, the ionizing radiation curable resin may be mixed with a thermoplastic resin and a solvent. Examples of thermosetting resins include phenolic resins, epoxy resins, silicone resins, melamine resins, urethane resins, urea resins, and the like. Among these, epoxy resins and silicone resins are preferable.

(Infrared shielding fine particles)
As the infrared shielding fine particles, for example, lanthanum hexaboride, cesium tungsten oxide, indium tin oxide, tin antimony oxide, titanium oxide, zinc oxide and palladium can be preferably used. From the viewpoint of heat ray shielding, particles that reflect heat rays without re-radiation are preferable to heat ray absorption types that have re-radiation of absorbed light into the room (about 1/3 of the absorbed solar radiation energy). By adding the infrared shielding fine particles, infrared rays can be reflected and the temperature rise in the room can be suppressed.

  The infrared shielding fine particles preferably have an average primary particle diameter of 1 nm to 10 μm, more preferably 5 nm to 5 μm, still more preferably 10 nm to 1 μm, and still more preferably 15 nm to 0.5 μm. When the average diameter of the infrared shielding fine particles is within the above range, when the sheet-like transparent molded product is used for a transparent screen, a sufficient infrared reflection effect can be obtained without impairing the transmission visibility, so that it is clear. An image can be projected to suppress an increase in indoor temperature. In the present invention, the average diameter of the infrared shielding fine particles was measured using a laser diffraction particle size distribution measuring device (manufactured by Shimadzu Corporation, product number: SALD-2300). The average aspect ratio was calculated from an SEM (trade name: SU-1500, manufactured by Hitachi High-Technologies Corporation) image.

  Commercially available infrared shielding fine particles may be used, for example, trade name JR-1000 manufactured by Teika Co., Ltd., trade names manufactured by Sumitomo Metal Mining Co., Ltd .: YMF-02A, KHF-7AH, YMDS-874. , KHDS-06 and the like can be preferably used.

  The content of the infrared shielding fine particles in the transparent light scattering layer can be appropriately adjusted according to the type of the infrared shielding fine particles, and is preferably 0.0001 to 5.0 mass% with respect to the resin. Preferably it is 0.0005-2 mass%, More preferably, it is 0.001-1 mass%. By dispersing the infrared shielding fine particles in the resin at a low concentration as in the above range to form a transparent light scattering layer, a sufficient infrared reflection effect can be obtained without impairing transmission visibility.

(Purple line shielding agent)
As the ultraviolet shielding agent, a metallic ultraviolet shielding agent or an organic ultraviolet shielding agent can be suitably used. By adding an ultraviolet shielding agent, ultraviolet rays can be blocked and deterioration of the sheet-like transparent molded product can be suppressed.

  As the metallic ultraviolet shielding agent, at least one metallic fine particle selected from the group consisting of zinc oxide, titanium oxide, and barium sulfate can be suitably used. The metal-based fine particles of the ultraviolet shielding agent preferably have an average primary particle diameter of 1 nm to 10 μm, more preferably 5 nm to 5 μm, still more preferably 10 nm to 1 μm, and even more preferably 15 nm to 0.5 μm. When the average diameter of the metallic fine particles of the ultraviolet shielding agent is within the above range, a sufficient ultraviolet shielding effect can be obtained without impairing transmission visibility when the sheet-like transparent molded product is used for a transparent screen. In addition to projecting clear images, it is possible to suppress light deterioration such as mechanical strength reduction and yellowing. In the present invention, the average diameter of the ultraviolet screening agent was measured using a laser diffraction particle size distribution measuring device (manufactured by Shimadzu Corporation, product number: SALD-2300). The average aspect ratio was calculated from an SEM (trade name: SU-1500, manufactured by Hitachi High-Technologies Corporation) image.

  As the organic ultraviolet shielding agent, at least one selected from the group consisting of benzotriazole ultraviolet absorbers, triazine ultraviolet absorbers, and benzophenone ultraviolet absorbers can be suitably used. Examples of the benzotriazole ultraviolet absorber include 2-ethylhexyl-3- [3-tert-butyl-4-hydroxy-5- (5-chloro-2H-benzotriazol-2-yl) phenyl] propionate, 2- [5 -Chloro (2H) -benzotriazol-2-yl] -4-methyl-6- (tert-butyl) phenol, 2- (2H-benzotriazol-2-yl) -4,6-di-tert-pentylphenol 2- (2H-benzotriazol-2-yl) -6-dodecyl-4-methylphenol, 2,2-methylenebis (4- (1,1,3,3-tetramethylbutyl) -6- (2H- Benzotriazol-2-yl) phenol), 2- (2'-hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy) -3 ', 5'-di-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy-3'-tert-butyl-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-3) ', 5'-di-tert-butylphenyl) -5-chlorobenzotriazole, 2- (2'-hydroxy-3'-(3 ", 4", 5 ", 6" -tetrahydrophthalimidomethyl) -5 ' -Methylphenyl) benzotriazole, 2- (2'-hydroxy-3'-tert-butyl-5'-methylphenyl) -5-chlorobenzotriazole, and the like. Examples of the triazine ultraviolet absorber include 2- (2-hydroxy-4- [1-octyloxycarbonylethoxy] phenyl) -4,6-bis (4-phenylphenyl) -1,3,5-triazine, 2, 4-bis [2-hydroxy-4-butoxyphenyl] -6- (2,4-dibutoxyphenyl) -1,3,5-triazine, 2- [4-[(2-hydroxy-3-dodecyloxypropyl) ) Oxy] -2-hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, 2- [4-[(2-hydroxy-3- (2′-ethyl) ) Hexyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine, and 2- [4-[(2-hydroxy-3-tridecyl) Oxip Ropyl) oxy] -2-hydroxyphenyl] -4,6-bis (2,4-dimethylphenyl) -1,3,5-triazine and the like. Examples of benzophenone ultraviolet absorbers include 2-hydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2,2 ′, 4,4′-tetrahydroxybenzophenone, hydroxymethoxybenzophenone sulfonic acid, and Examples include sodium hydroxymethoxybenzophenone sulfonate.

  A commercially available ultraviolet shielding agent may be used, and examples of the metallic ultraviolet shielding agent include zinc oxide (trade name: FZO) and titanium oxide (trade name: TTO-51 (A) manufactured by Ishihara Sangyo Co., Ltd. )), As an organic ultraviolet shielding agent, benzotriazole ultraviolet absorber (trade name: ADK STAB LA-31) manufactured by ADEKA Co., Ltd., triazine ultraviolet absorber (trade name: ADK STAB LA-46), BASF Japan A benzotriazole ultraviolet absorber (trade name: Tinuvin 234), a triazine ultraviolet absorber (trade names: Tinuvin 1577, Tinuvin 1600), a benzophenone ultraviolet absorber (trade name: ADK STAB 1413), and the like are preferably used. be able to.

  The content of the ultraviolet shielding agent in the transparent light-scattering layer can be appropriately adjusted according to the type of the ultraviolet shielding agent, and is preferably 0.0001 to 5.0% by mass with respect to the resin, preferably It is 0.0005-2 mass%, More preferably, it is 0.001-1 mass%. By dispersing the ultraviolet shielding agent in the resin at a low concentration within the above range to form a transparent light scattering layer, a sufficient ultraviolet shielding effect can be obtained without impairing transmission visibility.

(Bright flaky fine particles)
As the glittering flaky fine particles, a glittering material that can be processed into a flaky shape can be suitably used. The regular reflectance of the glittering flaky fine particles is preferably 12.0% or more, more preferably 15.0% or more, and further preferably 20.0% or more and 80.0% or less. In the present invention, the regular reflectance of the glittering flaky fine particles is a value measured as follows.
(Regular reflectance)
A spectrocolorimeter (manufactured by Konica Minolta Co., Ltd., product number: CM-3500d) was used. Lubricated flaky fine particles dispersed in an appropriate solvent (water or methyl ethyl ketone) were formed on a slide glass with a film thickness of 0.00. The coated glass plate was coated and dried so that the thickness was 5 mm or more.Specular reflection when light was incident on the coating film portion from the glass surface at an angle of 45 degrees with respect to the normal of the glass surface. By measuring the regular reflectance when the brilliant flaky fine particles are used as a coating film, the reflection performance of the brilliant flaky fine particles in consideration of the oxidation state of the surface of the fine particles can be grasped.

  As the glittering flaky fine particles, depending on the type of resin to be dispersed, for example, metallic fine particles such as aluminum, silver, platinum, gold, titanium, nickel, tin, tin-cobalt alloy, indium and chromium, or A metallic fine particle composed of aluminum oxide and zinc sulfide, a glittering material in which a metal or a metal oxide is coated on glass, or a glittering material in which a natural mica or a synthetic mica is coated with a metal or a metal oxide can be used.

As the metal material used for the metal-based fine particles, a metal material having excellent projection light reflectivity is used. Specifically, the metal material has a reflectance R at a measurement wavelength of 550 nm of preferably 50% or more, more preferably 55% or more, still more preferably 60% or more, and even more preferably 70% or more. . Hereinafter, in the present invention, “reflectance R” refers to the reflectance when light is incident on a metal material from the vertical direction. The reflectance R can be calculated by the following formula (1) using the refractive index n and the extinction coefficient k, which are intrinsic values of the metal material. n and k are, for example, in Handbook of Optical Constants of Solids: Volume 1 (by Edward D. Palik), PB Johnson and RW Christy, PHYSICAL REVIEW B, Vol. 6, No. 12, 4370-4379 (1972), etc. Have been described.
R = {(1-n) ² + k ² } / {(1 + n) ² + k ² } Formula (1)
That is, the reflectance R (550) at a measurement wavelength of 550 nm can be calculated from n and k measured at a wavelength of 550 nm. The metal material has an absolute value of the difference between the reflectance R (450) at the measurement wavelength 450 nm and the reflectance R (650) at the measurement wavelength 650 nm within 25% of the reflectance R (650) at the measurement wavelength 550 nm. Yes, preferably within 20%, more preferably within 15%, and even more preferably within 10%. By using such a metal material, when used as a reflective transparent screen, the reflection of projected light and color reproducibility are excellent, and the performance as a screen is excellent.

In the metal material used for the metal-based fine particles, the real term ε ′ of the dielectric constant is preferably −60 to 0, and more preferably −50 to −10. The real term ε ′ of the dielectric constant can be calculated by the following formula (2) using the values of the refractive index n and the extinction coefficient k.
ε ′ = n ² −k ² formula (2)
Although the present invention is not bound by any theory, when the real term ε ′ of the dielectric constant of the metal material satisfies the above numerical range, the following action occurs, and the transparent light scatterer is used as a reflective transparent screen. It is thought that it can be used suitably. That is, when light enters the metal-based fine particles, an oscillating electric field is generated in the metal-based fine particles, but at the same time, reverse electric polarization occurs due to free electrons of the metal-based fine particles, thereby shielding the electric field. When the real light ε ′ of the dielectric constant is 0 or less, the light is completely shielded so that the light cannot enter the metal-based fine particles, that is, there is no diffusion due to surface irregularities and no light absorption by the metal-based fine particles. Assuming an ideal state, all light is reflected on the surface of the metal-based fine particles, so that the light reflectivity is strong. When ε ′ is larger than 0, the vibration of free electrons in the metal-based fine particles cannot follow the vibration of light, so the vibration electric field due to light cannot be completely canceled, and the light enters the metal-based fine particles, It is transparent. As a result, only a part of the light is reflected on the surface of the metal-based fine particles, and the light reflectivity is lowered.

As the metal material, any metal material satisfying the above-described reflectance R, preferably further satisfying the dielectric constant may be used, and a pure metal or an alloy can also be used. The pure metal is preferably selected from the group consisting of aluminum, silver, platinum, titanium, nickel, and chromium. As the metal-based fine particles, fine particles made of these metal materials, or fine particles obtained by coating these metal materials with resin, glass, natural mica, or synthetic mica can be used. The shape of the metal-based fine particles is not particularly limited, and flaky fine particles, substantially spherical fine particles, and the like can be used. For various metal materials, the refractive index n and extinction coefficient k at each measurement wavelength are summarized in Table 1, and the reflectances R and ε ′ calculated using the values are summarized in Table 2.

  The glittering flaky fine particles preferably have an average primary particle diameter of 0.01 to 100 μm, more preferably 0.05 to 80 μm, still more preferably 0.1 to 50 μm, and still more preferably 0.5 to 30 μm. . Further, the bright flaky fine particles preferably have an average aspect ratio (= average diameter / average thickness of the bright flaky fine particles) of preferably 3 to 800, more preferably 4 to 700, still more preferably 5 to 600, and still more preferably. Is 10-500. When the average diameter and average aspect ratio of the glittering flaky fine particles are within the above ranges, when the sheet-like transparent molded product is used for a transparent screen, a sufficient scattering effect of projected light is obtained without impairing transmission visibility. As a result, a clear image can be projected. In the present invention, the average diameter of the glittering flaky fine particles was measured using a laser diffraction particle size distribution measuring device (manufactured by Shimadzu Corporation, product number: SALD-2300). The average aspect ratio was calculated from an SEM (trade name: SU-1500, manufactured by Hitachi High-Technologies Corporation) image.

  As the glittering flaky fine particles, commercially available ones may be used. For example, aluminum powder manufactured by Daiwa Metal Powder Co., Ltd., metal-coated glass (trade name: Metashine) manufactured by Matsuo Sangyo Co., Ltd. is preferably used. be able to.

  The content of the glittering flaky fine particles in the transparent light scattering layer can be appropriately adjusted according to the regular reflectance of the glittering flaky fine particles, and is preferably 0.0001 to 5.0 mass with respect to the resin. %, Preferably 0.0005 to 3.0 mass%, more preferably 0.001 to 1.0 mass%. Projection light is produced by anisotropically scattering and reflecting the projection light emitted from the light source by dispersing the glittering flaky fine particles in the resin at a low concentration within the above range to form a transparent light scattering layer. And the visibility of transmitted light can be improved.

(Substantially spherical fine particles)
The substantially spherical fine particles may include true spherical particles, or may include spherical particles having irregularities and protrusions. Refractive index _{n 1} and the refractive index _{n 2} of the substantially spherical fine particles of the resin is represented by the following equation (1):
| N ₂ −n ₁ | ≧ 0.1 (1)
It is preferable to satisfy the following formula (2):
| N ₂ −n ₁ | ≧ 0.15 (2)
It is more preferable to satisfy the following formula (3):
3.0 ≧ | n ₂ −n ₁ | ≧ 0.2 (3)
It is further preferable to satisfy When the refractive indexes of the resin forming the transparent light scattering layer and the substantially spherical fine particles satisfy the above formula, light can be scattered anisotropically in the transparent light scattering layer, and the viewing angle can be improved. Further, by using substantially spherical fine particles, light can be scattered omnidirectionally and luminance can be improved.

As the substantially spherical fine particles having a high refractive index, for example, the refractive index n ₂ is preferably 1.80 to 3.55, more preferably 1.9 to 3.3, and still more preferably 2.0 to It is possible to use an inorganic particle obtained by atomizing an inorganic substance, or a metal particle obtained by atomizing a metal oxide or metal salt, which is 3.0. Examples of the inorganic particles include diamond (n = 2.42). Examples of the metal oxide include zirconium oxide (n = 2.40) and cerium oxide (n = 2.20). Examples of the metal salt include barium titanate (n = 2.40) and strontium titanate (n = 2.37). As the inorganic substantially spherical particulates having a low refractive index, for example, is preferably a refractive index _{n 2} is from 1.35 to 1.80, more preferably from 1.4 to 1.75, more preferably 1.45 to 1.7, and particles obtained by atomizing silica (silicon oxide, n = 1.45) and the like can be mentioned. Further, examples of the organic substantially spherical fine particles having a low refractive index include acrylic particles and polystyrene particles. These substantially spherical fine particles can be used singly or in combination of two or more.

The median diameter of the primary particles of the substantially spherical fine particles is preferably 0.1 to 100 nm, more preferably 0.2 to 70 nm, and still more preferably 0.5 to 50 nm. When the median diameter of the primary particles of substantially spherical fine particles is within the above range, when used as a transparent sheet, a sufficient diffusion effect of projected light can be obtained without impairing transmission visibility, so that the transparent screen is clear. Video can be projected. In the present invention, the median diameter (D ₅₀ ) of the primary particles of the inorganic fine particles was measured by a dynamic light scattering method using a particle size distribution analyzer (trade name: DLS-8000, manufactured by Otsuka Electronics Co., Ltd.). It can be determined from the particle size distribution.

The content of the substantially spherical fine particles can be appropriately adjusted according to the thickness of the transparent light scattering layer and the refractive index of the fine particles. The content of fine particles in the transparent light scattering layer is preferably 0.0001 to 2.0% by mass, more preferably 0.001 to 1.0% by mass, and still more preferably 0, based on the resin. 0.005 to 0.5 mass%, and still more preferably 0.01 to 0.3 mass%. If the content of substantially spherical fine particles in the transparent light scattering layer is within the above range, the projection light emitted from the projection device is sufficiently diffused anisotropically while ensuring the transparency of the transparent light scattering layer. Thus, the visibility of diffused light and the visibility of transmitted light can be compatible.
(Base material layer)
A base material layer is a layer for supporting a sheet-like transparent molding by sticking together on both surfaces or one side of a sheet-like transparent molding, and can improve the intensity | strength of a sheet-like transparent molding. The base material layer is preferably made of a highly transparent resin or glass that does not impair the transmission visibility and desired optical properties of the sheet-like transparent molded body. As such a resin, for example, a highly transparent resin similar to the above transparent light scattering layer can be used. Acrylic resins, acrylic urethane resins, polyester acrylate resins, polyurethane acrylate resins, epoxy acrylate resins, polyester resins, polyolefin resins, urethane resins, epoxy resins, polycarbonate resins, cellulose resins, Acetal resin, vinyl resin, polystyrene resin, polyamide resin, polyimide resin, melamine resin, phenol resin, silicone resin, polyarylate resin, polyvinyl alcohol resin, polyvinyl chloride resin, polysulfone resin Resins, thermoplastic resins such as fluorine resins, thermosetting resins, ionizing radiation curable resins, and the like can be suitably used. Moreover, you may use the laminated body or sheet | seat which laminated | stacked 2 or more types of above-described resin. In addition, the thickness of a base material layer can be suitably changed according to a use and material so that the intensity | strength may become appropriate. For example, it may be in the range of 10 μm to 1 mm (1000 μm), and may be a thick plate of 1 mm or more.

(Protective layer)
The protective layer may be laminated on the surface side (viewer side) and / or the back surface side of the sheet-like transparent molded body, such as light resistance, scratch resistance, substrate adhesion, and antifouling property. This is a layer for providing the function. The protective layer is preferably formed using a resin that does not impair the transmission visibility and desired optical properties of the sheet-like transparent molded body.

  Examples of the material for the protective layer include polyester resins such as polyethylene terephthalate and polyethylene naphthalate, cellulose resins such as diacetyl cellulose and triacetyl cellulose, acrylic resins such as polymethyl methacrylate, polystyrene, acrylonitrile / styrene copolymers, and the like. Examples thereof include styrene resins such as (AS resin), polycarbonate resins, and the like. In addition, polyolefin resins such as polyethylene, polypropylene, ethylene / propylene copolymers, olefin resins having cycloolefin or norbornene structures, vinyl chloride resins, amide resins such as nylon and aromatic polyamide, imide resins, Sulfone resin, polyether sulfone resin, polyether ether ketone resin, polyphenylene sulfide resin, vinyl alcohol resin, vinylidene chloride resin, vinyl butyral resin, arylate resin, polyoxymethylene resin, epoxy resin Or the blend of the said resin etc. are mentioned as an example of resin which forms a protective film. Other examples include ionizing radiation curable resins such as acrylics, urethanes, acrylic urethanes, epoxies, and silicones, mixtures of thermoplastic resins and solvents in ionizing radiation curable resins, and thermosetting resins. .

  The film forming component of the ionizing radiation curable resin composition is preferably one having an acrylate functional group, such as a relatively low molecular weight polyester resin, polyether resin, acrylic resin, epoxy resin, urethane resin, alkyd resin, Spiroacetal resin, polybutadiene resin, polythiol polyene resin, oligomers or prepolymers such as (meth) arylate of polyfunctional compounds such as polyhydric alcohols, and reactive diluents such as ethyl (meth) acrylate, ethylhexyl (meth) acrylate, styrene, Monofunctional monomers such as methylstyrene and N-vinylpyrrolidone as well as polyfunctional monomers such as polymethylolpropane tri (meth) acrylate, hexanediol (meth) acrylate, tripropylene glycol di (meth) acrylate Diethylene glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (meth) acrylate, etc. A large amount can be used.

  In order to make the ionizing radiation curable resin composition into an ultraviolet curable resin composition, acetophenones, benzophenones, Michler benzoyl benzoate, α-amyloxime ester, tetramethylchuram mono are used as photopolymerization initiators. A mixture of sulfides, thioxanthones, n-butylamine, triethylamine, poly-n-butylphosphine, or the like as a photosensitizer can be used. In particular, in the present invention, it is preferable to mix urethane acrylate as an oligomer and dipentaerythritol hexa (meth) acrylate as a monomer.

  As a curing method of the ionizing radiation curable resin composition, the curing method of the ionizing radiation curable resin composition can be cured by a normal curing method, that is, irradiation with an electron beam or ultraviolet rays. For example, in the case of electron beam curing, 50 to 50 emitted from various electron beam accelerators such as a Cockloft Walton type, a bandegraph type, a resonant transformation type, an insulating core transformer type, a linear type, a dynamitron type, and a high frequency type An electron beam having an energy of 1000 KeV, preferably 100 to 300 KeV is used. In the case of ultraviolet curing, ultraviolet rays emitted from rays such as ultra-high pressure mercury lamp, high pressure mercury lamp, low pressure mercury lamp, carbon arc, xenon arc, metal halide lamp, etc. Available.

  The protective layer is formed by applying the coating liquid of the ionizing radiation (ultraviolet ray) radiation curable resin composition by a method such as spin coating, die coating, dip coating, bar coating, flow coating, roll coating, gravure coating, or the like. It can be formed by applying to the front side (viewer side) and / or the back side of the sheet-like transparent molded product for use, and curing the coating solution by the means described above.

(Adhesive layer)
An adhesion layer is a layer for sticking a base material layer, an antireflection layer, etc. to at least one side of a sheet-like transparent molding. It is also possible to produce a laminated structure in which an adhesive layer is provided on both surfaces of a sheet-like transparent molded body, and the sheet-like transparent molded body is sandwiched between base material layers. The pressure-sensitive adhesive layer is preferably formed using a pressure-sensitive adhesive composition that does not impair the transmission visibility and desired optical properties of the sheet-like transparent molded body. Examples of the pressure-sensitive adhesive composition include natural rubber, synthetic rubber, poly (meth) acrylic, polyvinyl ether, polyurethane, polysilicon, polyvinyl alcohol, and the like. Specific examples of synthetic rubbers include styrene-butadiene rubber, acrylonitrile-butadiene rubber, polyisobutylene rubber, isobutylene-isoprene rubber, styrene-isoprene block copolymer, styrene-butadiene block copolymer, styrene-ethylene-butylene block. A copolymer is mentioned. Specific examples of polyvinyl alcohol include polyvinyl butyral and ethylene-vinyl acetate resin. Specific examples of the polysilicone-based material include dimethylpolysiloxane. Among these, a polyvinyl alcohol adhesive and an acrylic adhesive are preferable. These pressure-sensitive adhesives can be used singly or in combination of two or more.

  The acrylic resin pressure-sensitive adhesive is a polymer containing at least a (meth) acrylic acid alkyl ester monomer. Generally, it is a copolymer of a (meth) acrylic acid alkyl ester monomer having an alkyl group having about 1 to 18 carbon atoms and a monomer having a carboxyl group. In addition, (meth) acrylic acid means at least any one of acrylic acid or methacrylic acid. Examples of (meth) acrylic acid alkyl ester monomers include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, sec-propyl (meth) acrylate, (meth) acrylic acid. n-butyl, sec-butyl (meth) acrylate, tert-butyl (meth) acrylate, isoamyl (meth) acrylate, n-hexyl (meth) acrylate, cyclohexyl (meth) acrylate, (meth) acrylic acid Examples thereof include n-octyl, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, undecyl (meth) acrylate, and lauryl (meth) acrylate. Moreover, the said (meth) acrylic-acid alkylester is normally copolymerized in the ratio of 30-99.5 mass parts in the acrylic adhesive.

  Moreover, as a monomer which has a carboxyl group which forms acrylic resin adhesive, the monomer containing carboxyl groups, such as (meth) acrylic acid, itaconic acid, crotonic acid, maleic acid, monobutyl maleate, and (beta) -carboxyethyl acrylate Can be mentioned.

  In addition to the above, the acrylic resin pressure-sensitive adhesive may be copolymerized with a monomer having another functional group within a range that does not impair the characteristics of the acrylic resin pressure-sensitive adhesive. Examples of monomers having other functional groups include monomers containing hydroxyl groups such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate and allyl alcohol; (meth) acrylamide, N-methyl Monomers containing amide groups such as (meth) acrylamide and N-ethyl (meth) acrylamide; Monomers containing amide groups and methylol groups such as N-methylol (meth) acrylamide and dimethylol (meth) acrylamide; Monomers having functional groups such as amino group-containing monomers such as meth) acrylate, dimethylaminoethyl (meth) acrylate and vinylpyridine; epoxy group-containing monomers such as allyl glycidyl ether and (meth) acrylic acid glycidyl ether -Etc. In addition, fluorine-substituted (meth) acrylic acid alkyl ester, (meth) acrylonitrile and the like, vinyl group-containing aromatic compounds such as styrene and methylstyrene, vinyl acetate, and vinyl halide compounds can be used.

  In the acrylic resin pressure-sensitive adhesive, in addition to the monomer having another functional group as described above, another monomer having an ethylenic double bond can be used. Examples of monomers having an ethylenic double bond include diesters of α, β-unsaturated dibasic acids such as dibutyl maleate, dioctyl maleate and dibutyl fumarate; vinyl esters such as vinyl acetate and vinyl propionate; vinyl ethers A vinyl aromatic compound such as styrene, α-methylstyrene and vinyltoluene; (meth) acrylonitrile and the like. In addition to the monomer having an ethylenic double bond as described above, a compound having two or more ethylenic double bonds may be used in combination. Examples of such compounds include divinylbenzene, diallyl malate, diallyl phthalate, ethylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, methylene bis (meth) acrylamide, and the like.

  Furthermore, in addition to the above-described monomers, monomers having an alkoxyalkyl chain can be used. Examples of (meth) acrylic acid alkoxyalkyl esters include 2-methoxyethyl (meth) acrylate, methoxyethyl (meth) acrylate, 2-methoxypropyl (meth) acrylate, and 3-methoxypropyl (meth) acrylate. , 2-methoxybutyl (meth) acrylate, 4-methoxybutyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, 3-ethoxypropyl (meth) acrylate, 4-ethoxybutyl (meth) acrylate And so on.

  As an adhesive composition, the homopolymer of the (meth) acrylic-acid alkylester monomer other than the above-mentioned acrylic resin adhesive may be sufficient. For example, (meth) acrylic acid ester homopolymers include poly (meth) acrylate methyl, poly (meth) ethyl acrylate, poly (meth) acrylate propyl, poly (meth) acrylate butyl, poly (meth) Examples include octyl acrylate. As a copolymer containing 2 or more types of acrylate units, methyl (meth) acrylate- (meth) ethyl acrylate copolymer, (meth) methyl acrylate- (meth) butyl acrylate copolymer, ( Examples include methyl (meth) acrylate- (meth) acrylic acid 2-hydroxyethyl copolymer, methyl (meth) acrylate- (meth) acrylic acid 2-hydroxy-3-phenyloxypropyl copolymer, and the like. As a copolymer of (meth) acrylic acid ester and other functional monomers, (meth) methyl acrylate-styrene copolymer, (meth) methyl acrylate-ethylene copolymer, (meth) acrylic A methyl acid- (meth) acrylic acid 2-hydroxyethyl-styrene copolymer is mentioned.

  Commercially available adhesives may be used, such as SK Dyne 2094, SK Dyne 2147, SK Dyne 1811L, SK Dyne 1442, SK Dyne 1435, and SK Dyne 1415 (above, manufactured by Soken Chemical Co., Ltd.), Olivain EG-655, Olivevine BPS5896 (above, manufactured by Toyo Ink Co., Ltd.), etc. (above, trade name) can be suitably used.

(Antireflection layer)
The antireflection layer is a layer for preventing reflection on the surface of the sheet-like transparent molded body and the outermost surface of the laminate and reflection of external light. The antireflection layer may be laminated only on one side on the viewer side or on the opposite side of the sheet-like transparent molded article or the laminate, or may be laminated on both sides. In particular, when used as a reflective screen, it is preferably laminated on the viewer side. The antireflection layer is preferably formed using a resin that does not impair the transmission visibility and desired optical characteristics of the sheet-like transparent molded body or the laminate. As such a resin, for example, a resin curable by ultraviolet rays or an electron beam, that is, an ionizing radiation curable resin, a mixture of an ionizing radiation curable resin and a thermoplastic resin and a solvent, and a thermosetting resin are used. Among these, ionizing radiation curable resins are particularly preferable.

  The method for forming the antireflection layer is not particularly limited, but is a method of pasting a coating film, a method of dry coating directly on a film substrate by vapor deposition or sputtering, gravure coating, micro gravure coating, bar coating, slide die coating. Methods such as wet coating such as coating, slot die coating, and dip coating can be used.

<Method for producing sheet-like transparent molded body>
The method for producing a sheet-like transparent molded body according to the present invention includes a step of forming a transparent light scattering layer, and further laminates other layers such as a protective layer, a base material layer, an adhesive layer, and an antireflection layer. In the case, it may further include a step of forming another layer including a stacking step. The process of forming the transparent light scattering layer is an extrusion molding method consisting of a kneading step and a film forming step, a cast film forming method, gravure coating, micro gravure coating, bar coating, slide die coating, slot die coating, Dip coat, coating method including spraying, injection molding method, calender molding method, blow molding method, compression molding method, encapsulate the monomer liquid between two glass plates, perform bulk polymerization in it, polymerize and solidify Molding can be performed by a known method such as a cell casting method for obtaining a plate-shaped molded body, and an extrusion molding method or an injection molding method can be suitably used because of the wide range of film thickness that can be formed. Hereinafter, each process of a manufacturing method is explained in full detail.

(Kneading process)
A kneading | mixing process is a process of forming a transparent light-scattering layer using an extruder. A single-screw or twin-screw kneading extruder can be used as the extruder, and the average value over the entire screw length of the twin-screw kneading extruder is preferably 3 to 1800 KPa, more preferably Is a step of kneading the above resin and fine particles while applying a shear stress of 6 to 1400 KPa to obtain a resin composition. If the shear stress is within the above range, the fine particles can be sufficiently dispersed in the resin. In particular, if the shear stress is 3 KPa or more, the dispersion uniformity of the fine particles can be further improved, and if it is 1800 KPa or less, decomposition of the resin is prevented and bubbles are prevented from being mixed in the transparent light scattering layer. be able to. The shear stress can be set in a desired range by adjusting the twin-screw kneading extruder. In the present invention, a resin composition obtained by adding a resin (master batch) to which fine particles have been added in advance and a resin to which fine particles have not been added is kneaded using a twin-screw kneading extruder to obtain a resin composition. Also good. The above is an example of a kneading process, and a resin (masterbatch) to which fine particles have been added in advance using a single screw kneading extruder may be prepared. May be produced.

  In addition to the above resin and fine particles, conventionally known additives may be added to the resin composition as long as the transmission visibility and desired optical performance of the sheet-like transparent molded body are not impaired. Examples of the additive include an antioxidant, a lubricant, a light stabilizer, a compatibilizer, a nucleating agent, and a stabilizer. The resin and the fine particles are as described above.

  The twin-screw kneading extruder used in the kneading process is one in which two screws are inserted into a cylinder, and is configured by combining screw elements. As the screw, a flight screw including at least a conveying element and a kneading element can be suitably used. The kneading element preferably contains at least one selected from the group consisting of a kneading element, a mixing element, and a rotary element. By using a flight screw including such a kneading element, fine particles can be sufficiently dispersed in the resin while applying a desired shear stress.

(Film forming process)
The film forming step is a step of forming a film of the resin composition obtained in the kneading step. The film forming method is not particularly limited, and a sheet-like transparent molded body made of the resin composition can be formed by a conventionally known method. For example, the resin composition obtained in the kneading step is supplied to a melt extruder heated to a temperature equal to or higher than the melting point (Tm to Tm + 70 ° C.) to melt the resin composition. As the melt extruder, a single screw kneading extruder, a twin screw kneading extruder, a vent extruder, a tandem extruder, or the like can be used depending on the purpose.

  Subsequently, the molten resin composition is extruded into a sheet shape by a die such as a T die, and the extruded sheet material is rapidly cooled and solidified by a rotating cooling drum or the like to form a sheet-shaped molded body. can do. In addition, when performing the film forming process continuously with the above kneading process, the resin composition obtained in the kneading process is directly extruded from a die in a molten state to form a sheet-like transparent light scattering layer. You can also.

  The sheet-like transparent light scattering layer obtained by the film forming step may be further uniaxially or biaxially stretched by a conventionally known method. The mechanical strength can be improved by stretching the transparent light scattering layer.

(Lamination process)
In the lamination step, when other layers such as a protective layer, a base material layer, an adhesive layer, and an antireflection layer are provided, another layer is further added on the sheet-like transparent light scattering layer obtained in the film forming step. It is a process of laminating. The method for laminating other layers is not particularly limited, and can be performed by a conventionally known method.

<Transparent screen>
The transparent screen according to the present invention comprises the above sheet-like transparent molded body. A transparent screen may consist only of said sheet-like transparent molded object, and may further be equipped with support bodies, such as a transparent partition. The transparent screen may be a flat surface, a curved surface, or an uneven surface.

  The transparent screen according to the present invention may be a rear projection screen (transmission screen) or a front projection screen (reflection screen). That is, in the video display device including the transparent screen according to the present invention, the position of the light source may be on the side opposite to the viewer (transmission type screen) or on the viewer side (reflection type). screen). Moreover, when using as a reflection type screen, the aspect in which a viewer visually recognizes an image from the transparent light-scattering layer side of the said sheet-like transparent molding is preferable. Such a transparent screen is excellent in the visibility of the projection light by anisotropically reflecting the projection light emitted from the light source, has a wide viewing angle, and is excellent in the visibility of the transmitted light.

(Support)
The support is for supporting the sheet-like transparent molded body. The support may be any material that does not impair the transmission visibility and desired optical characteristics of the reflective screen. Examples thereof include a transparent partition, a glass window, a head-up display for a passenger car, and a wearable display.

<Building materials>
The building member according to the present invention comprises the above-mentioned sheet-like transparent molded body or the above-described transparent screen. Examples of the building member include a window glass of a house, a glass wall of a convenience store, a road surface store, and the like. By providing the above-described sheet-like transparent molded body or the above-described transparent screen, the building member can display a clear image on the building member without providing a separate screen.

<Vehicle members>
The vehicle member according to the present invention includes the above-described sheet-like transparent molded body or the above-described transparent screen. Examples of the vehicle member include a windshield and a side glass. By providing the above-mentioned sheet-like transparent molded body or the above-described transparent screen, the vehicle member can display a clear image on the vehicle member without providing a separate screen.

<Video projection system>
A video projection system according to the present invention includes the above sheet-like transparent molded body or transparent screen, and a projection device. In the image display device, the position of the projection device (light source) may be on the viewer side with respect to the screen, or may be on the opposite side of the viewer. The projection device is not particularly limited as long as it can project an image on a screen. For example, a commercially available front projector can be used.

  A schematic diagram of one embodiment of a transparent screen and video projection system according to the present invention is shown in FIG. The transparent screen 33 includes a transparent partition (support) 32 and a sheet-like transparent molded body 31 on the viewer 34 side on the transparent partition 32. The sheet-like transparent molded body 31 may include an adhesive layer in order to stick to the transparent partition 32. In the case of a transmissive screen, the video projection system includes a transparent screen 33 and a projection device 35 </ b> A installed on the opposite side (back side) of the viewer 34 with respect to the transparent partition 32. Projection light 36A emitted from the projection device 35A enters from the back side of the transparent screen 33 and is anisotropically scattered by the transparent screen 33, so that the viewer 34 can visually recognize the scattered light 37A. In the case of a reflective screen, the video projection system includes a transparent screen 33 and a projection device 35 </ b> B installed on the same side (front side) as the viewer 34 with respect to the transparent partition 32. The projection light 36 </ b> B emitted from the projection device 35 </ b> B enters from the front side of the transparent screen 33 and is anisotropically scattered by the transparent screen 33, so that the viewer 34 can visually recognize the scattered light 37 </ b> B.

  EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated more concretely, this invention is limited to the following Example and is not interpreted.

In Examples and Comparative Examples, various physical properties and measuring methods for performance evaluation are as follows.
(1) Haze The haze was measured according to JIS K7136 using a turbidimeter (Nippon Denshoku Industries Co., Ltd., product number: NDH-5000).
(2) Total light transmittance It measured based on JISK7361-1 using the turbidimeter (Nippon Denshoku Industries Co., Ltd. product number: NDH-5000).
(3) Diffusion transmittance It measured based on JISK7361-1 using the turbidimeter (Nippon Denshoku Industries Co., Ltd. product number: NDH-5000).
(4) Reflected frontal light intensity Measured using a variable angle photometer (manufactured by Nippon Denshoku Industries Co., Ltd., product number: GC5000L). The incident angle of the light source was set to 45 degrees, and the reflected light intensity in the 0 degree direction when a standard white plate with a whiteness of 95.77 was placed on the measurement stage was set to 100. At the time of sample measurement, the incident angle of the light source was set to 15 degrees, and the intensity of reflected light in the 0 degree direction was measured.
(5) Transmitted frontal light intensity Measured using a variable angle photometer (manufactured by Nippon Denshoku Industries Co., Ltd., product number: GC5000L). The incident angle of the light source was set to 0 degree, and the transmitted light intensity in the 0 degree direction when nothing was placed on the measurement stage was set to 100. In the sample measurement, the incident angle of the light source was set to 15 degrees, and the intensity of transmitted light in the 0 degree direction was measured.
(6) Viewing angle It was measured using a variable angle photometer (Nippon Denshoku Industries Co., Ltd., product number: GC5000L). The incident angle of the light source was set to 0 degree, and the transmitted light intensity in the 0 degree direction when nothing was placed on the measurement stage was set to 100. At the time of sample measurement, the transmitted light intensity from −85 degrees to +85 degrees was measured in increments of 1 degree with the incident angle of the light source kept at 0 degrees. The viewing angle was defined as a range where the transmitted light intensity was 0.001 or more in the measurement range.
(7) Regular reflectance Spectra colorimeter (manufactured by Konica Minolta Co., Ltd., product number: CM-3500d) Measured using glittering flaky fine particles dispersed in an appropriate solvent (water or methyl ethyl ketone) on a slide glass The film was coated and dried so that the film thickness was 0.5 mm or more, and light was incident on the coating from the glass surface at an angle of 45 degrees with respect to the normal of the glass surface. The specular reflectance was measured.
(8) Image clarity Image clarity (%) when measured with an image comb width of 0.125 mm in accordance with JIS K7374 using a image clarity measuring device (manufactured by Suga Test Instruments Co., Ltd., product number: ICM-1T). The value of) was defined as image clarity. The larger the image sharpness value, the higher the transmission image clarity.
(9) Shielding coefficient It measured based on JIS A5759 using the ultraviolet visible near-infrared spectrophotometer (Corporation | KK Shimadzu make, model number UV-2600).
(10) Light resistance: b ^* value, number of MIT folding resistances For light resistance evaluation, a xenon weather meter [Toyo Seiki Seisakusho Atlas Ci4000] was used, biaxially stretched film, irradiance 60 W / m ² , black The panel temperature was 63 ± 3 ° C., the humidity was 50% RH, and the light irradiation was performed for 600 hours. Value was subtracted ^{b *} value after light irradiation from the front illumination ^{b *} value ^{(b * 1) Δb * (} = b * 1 -b *), and subtracted value of MIT folding endurance times before and after light irradiation ΔMIT (= MIT before light irradiation−MIT after light irradiation) was determined and light resistance was evaluated. b ^* is measured five times using Spectrophotometer SD6000 manufactured by Nippon Denshoku Industries Co., Ltd., and the average value is calculated. Δb ^* (= b ^{* 1−} b ^* ) is the b ^* value after light irradiation. It was calculated by subtracting from the previous b ^* value (b ^{* 1} ). The number of MIT folding resistances was measured using a BE-201 MIT bending resistance tester manufactured by Tester Sangyo Co., Ltd., with a load of 200 g, a bending point tip R of 0.38, a bending speed of 175 times / minute, and a bending angle of left and right. 135 °, the width of the film sample is 15 mm, under the measurement conditions of the sheet-like transparent molded body, the number of times of bending when it is repeatedly bent in the conveying direction, and the number of times of bending when it is repeatedly bent in the width direction It was measured by determining the average value. ΔMIT was calculated as a subtraction value of the number of MIT folding resistances before and after light irradiation (MIT before light irradiation−MIT after light irradiation).
(11) Screen performance As a transparent screen, the sheet-like transparent molded body produced below was manufactured by Onkyo Digital Solutions Co., Ltd. from a position 50 cm away from the normal direction of the sheet-like transparent molded body at an angle of 15 degrees. Images were projected using a mobile LED mini projector PP-D1S. Next, after adjusting the focus knob of the projector so that it is in focus on the surface of the screen, the images projected on the screen from the 1m front and 1m back of the screen are visually observed. Evaluation was made visually based on the following criteria. The performance as a reflective transparent screen can be evaluated by observation from the front, and the performance as a transmissive transparent screen can be evaluated by observation from the rear.
[Evaluation criteria]
A: The image could be seen very clearly.
○: The image was clearly visible.
(Triangle | delta): The outline and hue of an image | video were visually recognized with a little blur.
X: The outline of the image was blurred and unsuitable for use as a screen.

[Example A1]
(1) Production of thermoplastic resin pellets to which fine particles have been added (hereinafter referred to as “pellet production process”)
Polyethylene terephthalate (PET) pellets (trade name: IP121B, manufactured by Bell Polyester Products Co., Ltd.) were prepared as the thermoplastic resin. As the infrared shielding fine particles, 0.001% by mass of cesium tungsten oxide fine particles (manufactured by Sumitomo Metal Mining Co., Ltd., trade name: YMF-02A, average diameter of primary particles: 15 nm) Refractive index 1.66), luminescent flaky fine particles, 0.0085 mass% flaky aluminum fine particles A (average primary particle diameter 10 μm, aspect ratio 300, regular reflectance 62.8%) with respect to PET pellets Was added and mixed with a rotary mixer to obtain PET pellets in which cesium tungsten oxide fine particles and flaky aluminum fine particles were uniformly adhered to the surface of the PET pellets.
(2) Production of transparent light scattering layer (sheet-like transparent molded product) (hereinafter referred to as “sheet production process”)
The obtained fine particle-added PET pellets were put into a hopper of a screw type twin-screw kneading extruder (trade name: KZW-30MG, manufactured by Technobel Co., Ltd.), and a transparent light scattering layer (sheet-like transparent molding) having a thickness of 80 μm. Body). The screw diameter of the twin-screw kneading extruder was 20 mm, and the screw effective length (L / D) was 30. In addition, a hanger coat type T-die was installed in the twin-screw kneading extruder through an adapter. The extrusion temperature was 270 ° C., the screw rotation speed was 500 rpm, and the shear stress was 300 KPa. The used screw has a total length of 670 mm, including a mixing element between 160 mm and 185 mm from the hopper side of the screw, and a kneading element between 185 mm and 285 mm, and the other parts are flight It was a shape.
(3) Evaluation of Transparent Screen When the produced transparent light scattering layer (sheet-like transparent molded product) was used as it was for a transparent screen, the haze value was 4.8%, the diffuse transmittance was 4.1%, and the total light transmittance. Was 86.0% and had high transparency.
The transmission front luminous intensity (× 1000) measured with a goniophotometer was 1.00, and it was found that the transmission front luminous intensity was excellent. The reflected front brightness measured with a goniophotometer was 9.8, and it was found that the reflected front brightness was excellent. The viewing angle measured with a goniophotometer was ± 18 degrees, and it was found that the viewing angle characteristics were excellent. Further, the image clarity measured by the image clarity measuring instrument is 89%, and as a result of visual evaluation of the visibility, it is possible to clearly see the image during both the front observation and the rear observation. I was able to see clear images. Moreover, it was found that the shielding coefficient was 0.85 and had an excellent heat ray shielding effect.

[Example A2]
In Example 1 (1) pellet preparation step, the addition amount of cesium tungsten oxide fine particles was 0.010% by mass, and zirconium oxide particles (manufactured by Kanto Denka Kogyo Co., Ltd., refractive index 2.40) as substantially spherical fine particles. A transparent light scattering layer (sheet-like transparent molded body) having a thickness of 100 μm was produced in the same manner as in Example A1, except that 0.15% by mass of the median diameter of primary particles (10 nm) was added.
When the produced transparent light scattering layer (sheet-like transparent molding) was used as it was for a transparent screen, the haze value was 13.9%, the diffuse transmittance was 10.1%, and the total light transmittance was 72.4%. And had high transparency.
The transmission front luminous intensity (× 1000) measured with a goniophotometer was 11.29, and it was found that the transmission front luminous intensity was excellent. The reflected front light intensity measured with a goniophotometer was 5.1, and it was found that the reflected front light intensity was excellent. The viewing angle measured with a goniophotometer was ± 32 degrees, and it was found that the viewing angle characteristics were excellent. Further, the image clarity measured by the image clarity measuring instrument was 85%, and as a result of visual evaluation of the visibility, it was possible to visually recognize the image very clearly during both the front observation and the rear observation. Further, the shielding coefficient was 0.68, and it was found that it has an excellent heat ray shielding effect.

[Example A3]
In the step (1) pellet preparation of Example A1, the amount of flaky aluminum fine particles A added was 0.042% by mass, and lanthanum hexaboride instead of cesium tungsten oxide as infrared shielding fine particles (Sumitomo Metal Mining Co., Ltd.) A transparent light scattering layer (sheet-like transparent molded body) having a film thickness of 80 μm was produced in the same manner as in Example A1, except that 0.001% by mass (trade name: KHF-7AH, average diameter: 80 nm) was used. . Since KHF-7AH (lanthanum hexaboride) contains 1.5 times the amount of zirconium oxide as the content of cesium tungsten oxide, the transparent light scattering layer contains 0.0015% by mass of zirconium oxide. Yes.
When the produced transparent light scattering layer (sheet-like transparent molded product) was used as it was for a transparent screen, the haze value was 18.1%, the diffuse transmittance was 12.9%, and the total light transmittance was 71.0%. Although it was a little inferior to Example A2, it had sufficient transparency.
The transmission front light intensity (× 1000) measured with a goniophotometer was 3.11, and it was found that the transmission front light intensity (× 1000) was excellent. The reflected front light intensity measured with a goniophotometer was 38.2, and it was found that the reflected front light intensity was excellent. The viewing angle measured with a goniophotometer was ± 33 degrees, and it was found that the viewing angle characteristics were excellent. Further, the image clarity measured by the image clarity measuring device was 91%, and as a result of visual evaluation of the visibility, it was possible to visually recognize the image very clearly during both the front observation and the rear observation. Moreover, it was found that the shielding coefficient was 0.88 and had an excellent heat ray shielding effect.

[Example A4]
In the step (1) pellet preparation of Example A1, flaky aluminum fine particles B (average primary particle diameter of 7 μm, aspect ratio of 40, regular reflectance of 24.6%) as glittering flaky fine particles were 0 for PET pellets. .014 mass% was added, and 0.005 mass% of titanium oxide (trade name: JR-1000, average diameter: 1 μm) manufactured by Teica Co., Ltd. was added instead of cesium tungsten oxide as infrared shielding fine particles. A transparent light scattering layer (sheet-like transparent molded body) having a film thickness of 100 μm was produced in the same manner as in Example A1.
When the produced transparent light scattering layer (sheet-like transparent molded product) was used as it was for a transparent screen, the haze value was 5.1%, the diffuse transmittance was 4.4%, and the total light transmittance was 86.4%. And had high transparency.
The transmission front luminous intensity (× 1000) measured with a goniophotometer was 0.80, and it was found that the transmission front luminous intensity was excellent. The reflected front luminous intensity measured with a goniophotometer was 6.3, and it was found that the reflected front luminous intensity was excellent. The viewing angle measured with a goniophotometer was ± 18 degrees, and it was found that the viewing angle characteristics were excellent. Further, the image clarity measured by the image clarity measuring instrument was 91%, and as a result of visual evaluation of the visibility, it was possible to clearly see the image both during the front observation and during the rear observation. I was able to see clear images. Moreover, it was found that the shielding coefficient was 0.87, and it had an excellent heat ray shielding effect.

[Example A5]
In Example 1 (1) pellet preparation step, titanium oxide (TiO ₂ ) -coated mica (manufactured by Topy Industries Co., Ltd., trade name: Helios R10S, average particle diameter of 12 μm, aspect ratio 80) as bright flaky fine particles A transparent light scattering layer (sheet-like transparent molded product) having a film thickness of 100 μm was prepared in the same manner as in Example A1, except that 0.1% by mass of regular reflectance 16.5%) was used.
When the produced transparent light scattering layer (sheet-like transparent molded product) was used as it was for a transparent screen, the haze value was 2.8%, the diffuse transmittance was 2.6%, and the total light transmittance was 91.2%. And had high transparency.
The transmission front light intensity (× 1000) measured with a goniophotometer was 1.45, and it was found that the transmission front light intensity was excellent. The reflected front luminous intensity measured with a goniophotometer was 8.2, indicating that the reflected front luminous intensity is excellent. The viewing angle measured with a goniophotometer was ± 15 degrees, and it was found that the viewing angle characteristics were excellent. Further, the image clarity measured by the image clarity measuring instrument is 88%, and as a result of visual evaluation of the visibility, it is possible to clearly see the image during both the front observation and the rear observation. I was able to see clear images. Moreover, it was found that the shielding coefficient was 0.86 and had an excellent heat ray shielding effect.

[Example A6]
Except that 0.001 mass% of aluminum C (average diameter of primary particles 1 μm, aspect ratio 25, regular reflectance 16.8%) was used as the glittering flaky fine particles in the pellet preparation step of Example A1 (1). A transparent light scattering layer (sheet-like transparent molded product) having a thickness of 80 μm was produced in the same manner as Example A1.
When the produced transparent light scattering layer (sheet-like transparent molded product) was used as it was for a transparent screen, the haze value was 1.8%, the diffuse transmittance was 1.7%, and the total light transmittance was 92.1%. And had high transparency.
The transmission front luminous intensity (× 1000) measured with a goniophotometer was 0.65, and it was found that the transmission front luminous intensity was excellent. The reflected front brightness measured with a goniophotometer was 2.9, and it was found that the reflected front brightness was excellent. The viewing angle measured with a goniophotometer was ± 15 degrees, and it was found that the viewing angle characteristics were excellent. Further, the image clarity measured by the image clarity measuring instrument is 92%, and as a result of visual evaluation of the visibility, it is possible to clearly see the image both during the front observation and during the rear observation. I was able to see clear images. Moreover, it was found that the shielding coefficient was 0.88 and had an excellent heat ray shielding effect.

[Example A7]
A transparent light scattering layer (sheet-like transparent molded body) having a thickness of 100 μm was prepared in the same manner as in Example A2 except that the glittering flaky fine particles were not added in the (1) pellet preparation step of Example A2.
When the produced transparent light scattering layer (sheet-like transparent molding) was used as it was for a transparent screen, the haze value was 13.2%, the diffuse transmittance was 10.7%, and the total light transmittance was 81.3%. And had high transparency.
The transmission front light intensity (× 1000) measured with a goniophotometer was 3.8, and it was found that the transmission front light intensity was excellent. The reflected front light intensity measured with a goniophotometer was 1.9, and it was found that the reflected front light intensity was excellent. The viewing angle measured with a goniophotometer was ± 28 degrees, and it was found that the viewing angle characteristics were excellent. Further, the image clarity measured by the image clarity measuring instrument is 88%, and as a result of visual evaluation of the visibility, it is possible to clearly see the image during both the front observation and the rear observation, and particularly during the rear observation. I was able to see clear images. Moreover, it was found that the shielding coefficient was 0.69, which had an excellent heat ray shielding effect.

[Example A8]
In Example 1 (1) pellet preparation step, the addition amount of cesium tungsten oxide was 0.0001% by mass, and instead of flaky aluminum fine particles A as bright flaky fine particles, silver particles (average diameter of primary particles 1 μm, Except that the aspect ratio was 200 and the regular reflectance was 32.8%, 0.001% by mass, a pellet having cesium tungsten oxide and silver particles adhered thereto was obtained in the same manner as in Example A1. Using the obtained pellets, a transparent light scattering layer (sheet-like transparent molded product) having a film thickness of 1000 μm was produced by an injection molding machine (manufactured by Nissei Plastic Industry Co., Ltd., trade name: FNX-III).
When the produced transparent light scattering layer (sheet-like transparent molded product) was used as it was for a transparent screen, the haze value was 6.4%, the diffuse transmittance was 4.5%, and the total light transmittance was 70.1%. And had high transparency.
The transmission front luminous intensity (× 1000) measured with a goniophotometer was 1.42, indicating that the transmission front luminous intensity was excellent. The reflected front brightness measured with a goniophotometer was 14.8, and it was found that the reflected front brightness was excellent. The viewing angle measured with a goniophotometer was ± 18 degrees, and it was found that the viewing angle characteristics were excellent. Also, the image clarity measured by a image clarity measuring instrument is 74%, and as a result of visual assessment of visibility, it is possible to clearly see the image both during the front observation and the rear observation, particularly during the front observation. I was able to see clear images. Moreover, it was found that the shielding coefficient was 0.87, and it had an excellent heat ray shielding effect.

[Comparative Example A1]
A transparent light scattering layer (sheet-like transparent molded product) having a thickness of 100 μm was produced in the same manner as in Example A1, except that in the (1) pellet production step of Example A1, infrared shielding fine particles were not added.
When the produced transparent light scattering layer (sheet-like transparent molding) was used as it was for a transparent screen, the haze value was 4.0%, the diffuse transmittance was 3.6%, and the total light transmittance was 89.1%. The image clarity measured with a image clarity measuring device was 92%.
The transmission front light intensity (× 1000) measured with a goniophotometer was 1.06, and the reflection front light intensity was 9.2. The viewing angle measured with a goniophotometer was ± 14 degrees, and as a result of visual evaluation of visibility, a clear image was able to be seen particularly during forward observation, but the shielding coefficient was 0.95. Yes, the heat ray shielding effect was inferior.

[Comparative Example A2]
Mica particles (trade name: A-21S, primary particles, manufactured by Yamaguchi Mica Co., Ltd.) as flaky fine particles having no glitter, without adding bright flaky fine particles in the pellet preparation step of Example A1 A transparent light scattering layer (sheet-like transparent molded product) having a film thickness of 100 μm in the same manner as in Comparative Example A1 except that 0.2 mass% of an average diameter of 23 μm, an aspect ratio of 70, and a regular reflectance of 9.8% were added. Was made.
When the produced transparent light scattering layer (sheet-like transparent molded product) was used as it was for a transparent screen, the haze value was 9.0%, the diffuse transmittance was 8.1%, and the total light transmittance was 90.0%. The image clarity measured with a image clarity measuring instrument was 87%.
The transmission front light intensity (× 1000) measured with a goniophotometer was 2.63, the reflection front light intensity was 1.0, and the reflection front light intensity was inferior. Although the viewing angle measured with a goniophotometer is ± 20 degrees and the viewing angle characteristics are excellent, the visibility was visually evaluated. As a result, it was possible to see the image both during forward observation and during backward observation. There wasn't. Moreover, the shielding coefficient was 0.93 and the heat ray shielding effect was inferior.

The details of the transparent light scattering layers used in Examples A1 to 7 and Comparative Examples A1 to A2 are shown in Table 3.

Table 4 shows the results of various physical properties and performance evaluations of the sheet-like transparent molded bodies used in Examples A1 to 7 and Comparative Examples A1 and A2.

[Example B1]
(1) Production of thermoplastic resin pellets to which fine particles have been added (hereinafter referred to as “pellet production process”)
Polyethylene terephthalate (PET) pellets (trade name: IP121B, manufactured by Bell Polyester Products Co., Ltd.) were prepared as the thermoplastic resin. To the PET pellet, as an ultraviolet shielding agent, 0.001% by mass of zinc oxide based on the PET pellet (ZnO, manufactured by Ishihara Sangyo Co., Ltd., trade name: FZO, average particle size of primary particles: 0.021 μm), As the flaky fine particles, 0.0085% by mass of flaky aluminum fine particles A (average primary particle diameter 10 μm, aspect ratio 300, regular reflectance 62.8%) with respect to the PET pellets are added. By mixing with a mixer, a PET pellet having zinc oxide fine particles and flaky aluminum fine particles uniformly adhered to the surface of the PET pellets was obtained.
(2) Production of transparent light scattering layer (sheet-like transparent molded product) (hereinafter referred to as “sheet production process”)
The obtained fine particle-added PET pellets were put into a hopper of a screw type twin-screw kneading extruder (trade name: KZW-30MG, manufactured by Technobel Co., Ltd.), and a transparent light scattering layer (sheet-like transparent molded product) having a thickness of 80 μm. ) Was produced. The screw diameter of the twin-screw kneading extruder was 20 mm, and the screw effective length (L / D) was 30. In addition, a hanger coat type T-die was installed in the twin-screw kneading extruder through an adapter. The extrusion temperature was 270 ° C., the screw rotation speed was 500 rpm, and the shear stress was 300 KPa. The used screw has a total length of 670 mm, including a mixing element between 160 mm and 185 mm from the hopper side of the screw, and a kneading element between 185 mm and 285 mm, and the other parts are flight It was a shape.
(3) Evaluation of transparent screen When the produced transparent light scattering layer (sheet-like transparent molding) was used as it was for a transparent screen, the haze value was 4.8%, the diffuse transmittance was 4.3%, and the total light transmittance. Was 88.7% and had high transparency.
The transmission front luminous intensity (× 1000) measured with a goniophotometer was 1.21, and it was found that the transmission front luminous intensity was excellent. The reflected front luminous intensity measured with a goniophotometer was 10.2, indicating that the reflected front luminous intensity is excellent. The viewing angle measured with a goniophotometer was ± 18 degrees, and it was found that the viewing angle characteristics were excellent. Further, the image clarity measured by the image clarity measuring instrument is 89%, and as a result of visual evaluation of the visibility, it is possible to clearly see the image during both the front observation and the rear observation. I was able to see clear images. Δb ^* is 0.03 (b ^* value before UV irradiation = 0.53, b ^{* 1} value after UV irradiation = 0.58), and ΔMIT is 1151 (MIT before UV irradiation = 12020, MIT after UV irradiation = 10869). ) And was found to have excellent light resistance.

[Example B2]
In Example B1 (1) pellet preparation step, the addition amount of zinc oxide fine particles was 0.010 mass%, and zirconium oxide (ZrO ₂ , manufactured by Kanto Denka Kogyo Co., Ltd., refractive index 2.40, A transparent light scattering layer (sheet-like transparent molded product) having a thickness of 80 μm was prepared in the same manner as in Example B1, except that 0.15% by mass of the median diameter of primary particles (10 nm) was added.
When the produced transparent light scattering layer (sheet-like transparent molding) was used as it was for a transparent screen, the haze value was 15.7%, the diffuse transmittance was 11.4%, and the total light transmittance was 72.9%. And had high transparency.
The transmission front luminous intensity (× 1000) measured with a goniophotometer was 11.29, and it was found that the transmission front luminous intensity was excellent. The reflected front light intensity measured with a goniophotometer was 5.1, and it was found that the reflected front light intensity was excellent. The viewing angle measured with a goniophotometer was ± 32 degrees, and it was found that the viewing angle characteristics were excellent. Further, the image clarity measured by the image clarity measuring instrument was 85%, and as a result of visual evaluation of the visibility, it was possible to visually recognize the image very clearly during both the front observation and the rear observation. Δb ^* is 0.02 (b ^* value before UV irradiation = 0.61, b ^{* 1} value after UV irradiation = 0.63), and ΔMIT is 633 (MIT before UV irradiation = 9013, MIT after UV irradiation = 8380). ) And was found to have excellent light resistance.

[Example B3]
In Example 1 (1) pellet preparation step, instead of zinc oxide fine particles, titanium oxide (TiO ₂ , manufactured by Ishihara Sangyo Co., Ltd., trade name: TTO-51 (A), primary particle as an ultraviolet shielding agent Except that 0.001% by mass of the average diameter 0.01-0.03 μm), 0.042% by mass of flaky aluminum fine particles A, and 0.0015% by mass of zirconium oxide fine particles were added, the same as Example B1. A transparent light scattering layer (sheet-like transparent molded body) having a thickness of 80 μm was prepared.
When the produced transparent light scattering layer (sheet-like transparent molded product) was used as it was for a transparent screen, the haze value was 15.5%, the diffuse transmittance was 11.0%, and the total light transmittance was 71.2%. And had high transparency.
The transmission front light intensity (× 1000) measured with a goniophotometer was 4.11, indicating that the transmission front light intensity (× 1000) was excellent. The reflected front brightness measured with a goniophotometer was 33.1, and it was found that the reflected front brightness was excellent. The viewing angle measured with a goniophotometer was ± 33 degrees, and it was found that the viewing angle characteristics were excellent. Further, the image clarity measured by the image clarity measuring instrument was 90%, and as a result of visual evaluation of the visibility, it was possible to visually recognize the image very clearly during both the front observation and the rear observation. Δb ^* is 0.03 (b ^* value before UV irradiation = 0.52, b ^{* 1} value after UV irradiation = 0.55), and ΔMIT is 889 (MIT before UV irradiation = 1163, MIT after UV irradiation = 10474). ) And was found to have excellent light resistance.

[Example B4]
In Example B1 (1) pellet preparation step, 0.10% by mass of triazine-based ultraviolet absorber (manufactured by BASF Japan, trade name: Tinuvin 1577) as an ultraviolet shielding agent instead of zinc oxide fine particles, and glitter Except for the addition of 0.014% by mass of flaky aluminum fine particles B (average primary particle diameter of 7 μm, aspect ratio of 40, regular reflectance of 24.6%) as flaky fine particles, the film thickness was 100 μm. A transparent light scattering layer (sheet-like transparent molded body) was produced.
When the produced transparent light scattering layer (sheet-like transparent molded product) was used as it was for a transparent screen, the haze value was 4.6%, the diffuse transmittance was 4.1%, and the total light transmittance was 89.4%. And had high transparency.
The transmission front light intensity (× 1000) measured with a goniophotometer was 1.01, and it was found that the transmission front light intensity was excellent. The reflected front light intensity measured with a goniophotometer was 7.7, and it was found that the reflected front light intensity was excellent. The viewing angle measured with a goniophotometer was ± 18 degrees, and it was found that the viewing angle characteristics were excellent. Further, the image clarity measured by the image clarity measuring instrument is 89%, and as a result of visual evaluation of the visibility, it is possible to clearly see the image during both the front observation and the rear observation. I was able to see clear images. Δb ^* is 0.01 (b ^* value before UV irradiation = 0.62, b ^{* 1} value after UV irradiation = 0.63), and ΔMIT is 965 (MIT before UV irradiation = 12451, MIT after UV irradiation = 11486). ) And was found to have excellent light resistance.

[Example B5]
In the step (1) pellet preparation of Example B1, titanium oxide (TiO ₂ ) -coated mica (made by Topy Industries Co., Ltd., trade name: Helios R10S, average particle diameter of primary particles: 12 μm, aspect ratio: 80 as bright flaky fine particles , Regular reflectance 16.5%) 0.1% by mass, and benzotriazole UV absorber (trade name: ADK STAB LA-31, manufactured by ADEKA Co., Ltd.) instead of zinc oxide as an ultraviolet shielding agent is 0.00. A transparent light scattering layer (sheet-like transparent molded product) having a thickness of 100 μm was produced in the same manner as in Example B1 except that 20% by mass was used.
When the produced transparent light scattering layer (sheet-like transparent molded product) was used as it was for a transparent screen, the haze value was 2.4%, the diffuse transmittance was 2.2%, and the total light transmittance was 92.9%. And had high transparency.
The transmission front light intensity (× 1000) measured with a goniophotometer was 0.50, and it was found that the transmission front light intensity was excellent. The reflected front light intensity measured with a goniophotometer was 5.3, and it was found that the reflected front light intensity was excellent. The viewing angle measured with a goniophotometer was ± 15 degrees, and it was found that the viewing angle characteristics were excellent. Further, the image clarity measured by the image clarity measuring instrument was 92%, and as a result of visual evaluation of the visibility, it was possible to clearly see the image both during the front observation and during the rear observation. Δb ^* is 0.01 (b ^* value before UV irradiation = 0.62, b ^{* 1} value after UV irradiation = 0.63), and ΔMIT is 768 (MIT before UV irradiation = 8242, MIT after UV irradiation = 7474). ) And was found to have excellent light resistance.

[Example B6]
Example B1 (1) In the pellet preparation step, except that 0.15% by mass of a benzotriazole ultraviolet absorber (trade name: Tinuvin 234, manufactured by BASF Japan Ltd.) was used instead of zinc oxide as an ultraviolet shielding agent. In the same manner as in Example B1, a transparent light scattering layer (sheet-like transparent molded product) having a thickness of 100 μm was produced.
When the produced transparent light scattering layer (sheet-like transparent molding) was used as it was for a transparent screen, the haze value was 4.5%, the diffuse transmittance was 4.0%, and the total light transmittance was 89.1%. And had high transparency.
The transmission front light intensity (× 1000) measured with a goniophotometer was 1.06, and it was found that the transmission front light intensity was excellent. The reflected front light intensity measured with a goniophotometer was 9.2, and it was found that the reflected front light intensity was excellent. The viewing angle measured with a goniophotometer was ± 18 degrees, and it was found that the viewing angle characteristics were excellent. Further, the image clarity measured by the image clarity measuring instrument is 92%, and as a result of visual evaluation of the visibility, it is possible to clearly see the image both during the front observation and during the rear observation. I was able to see clear images. Δb ^* is 0.01 (b ^* value before ultraviolet irradiation = 0.59, b ^{* 1} value after ultraviolet irradiation = 0.60), ΔMIT is 1312 (MIT before ultraviolet irradiation = 101038, MIT after ultraviolet irradiation = 9726) ) And was found to have excellent light resistance.

[Example B7]
In the (1) pellet preparation step of Example B4, the addition amount of tinuvin 1577 was changed to 0.01% by mass, and instead of flaky aluminum fine particles B as bright flaky fine particles, silver particles (average diameter of primary particles 1 μm) ), Except that 0.001% by mass of an aspect ratio of 200 and a regular reflectance of 32.8% was used to obtain a pellet with tinuvin 1577 and silver particles attached thereto in the same manner as in Example B4. Using the obtained pellets, a transparent light scattering layer (sheet-like transparent molded product) having a film thickness of 1000 μm was produced by an injection molding machine (manufactured by Nissei Plastic Industry Co., Ltd., trade name: FNX-III).
When the produced transparent light scattering layer (sheet-like transparent molded product) was used as it was for a transparent screen, the haze value was 5.6%, the diffuse transmittance was 4.1%, and the total light transmittance was 73.2%. And had high transparency.
The transmission front light intensity (× 1000) measured with a goniophotometer was 1.32, and it was found that the transmission front light intensity was excellent. The reflected front luminous intensity measured with a goniophotometer was 13.8, and it was found that the reflected front luminous intensity was excellent. The viewing angle measured with a goniophotometer was ± 21 degrees, and it was found that the viewing angle characteristics were excellent. In addition, the image clarity measured by the image clarity measuring instrument is 75%, and as a result of visual evaluation of the visibility, it is possible to clearly see the image both during the front observation and during the rear observation. I was able to see clear images. Δb ^* was 0.02 (b ^* value before ultraviolet irradiation = 0.62, b ^{* 1} value after ultraviolet irradiation = 0.64). In addition, since the transparent light-scattering layer of a present Example is a board with a thickness of 1000 micrometers, (DELTA) MIT cannot be measured.

[Comparative Example B1]
A transparent light scattering layer (sheet-like transparent molded product) having a thickness of 80 μm was produced in the same manner as in Example B1, except that the ultraviolet shielding agent was not added in the (1) pellet production step of Example B1.
When the produced transparent light scattering layer (sheet-like transparent molding) was used as it was for a transparent screen, the haze value was 4.0%, the diffuse transmittance was 3.6%, and the total light transmittance was 89.1%. The image clarity measured with a image clarity measuring device was 92%. The transmission front light intensity (× 1000) measured with a goniophotometer was 1.06, and the reflection front light intensity was 9.2. The viewing angle measured with a goniophotometer is ± 14 degrees, and as a result of visual evaluation of visibility, it is possible to clearly see the image during both the front observation and the rear observation, especially during the front observation. I was able to see the correct image. Δb ^* is 0.15 (b ^* value before UV irradiation = 0.52, b ^{* 1} value after UV irradiation = 0.67), and ΔMIT is 3242 (MIT before UV irradiation = 14532, MIT after UV irradiation = 11290). ) And light resistance was inferior.

[Comparative Example B2]
Mica particles (trade name: A-21S, primary particles, manufactured by Yamaguchi Mica Co., Ltd.) were used as the flaky fine particles having no glitter in the step (1) pellet preparation step of Example B3. The average diameter was 23 μm, the aspect ratio was 70, and the regular reflectance was 9.8%, and 0.2 mass% was added. Further, in the same manner as in Example B3, the film thickness was 80 μm except that no ultraviolet shielding agent was added. A transparent light scattering layer (sheet-like transparent molded body) was produced.
When the produced transparent light scattering layer (sheet-like transparent molded product) was used as it was for a transparent screen, the haze value was 9.0%, the diffuse transmittance was 8.1%, and the total light transmittance was 90.0%. The image clarity measured with a image clarity measuring instrument was 87%. The transmission front light intensity (× 1000) measured with a goniophotometer was 2.63, the reflection front light intensity was 1.0, and the reflection front light intensity was inferior. Although the viewing angle measured with a goniophotometer is ± 20 degrees and the viewing angle characteristics are excellent, the visibility is visually evaluated. As a result, the outline and hue of the image are slightly blurred during forward observation. When viewed from the rear, the outline of the image was blurred, making it unsuitable for use as a screen. Δb ^* is 0.12 (b ^* value before UV irradiation = 0.53, b ^{* 1} value after UV irradiation = 0.65), and ΔMIT is 4140 (MIT before UV irradiation = 9269, MIT after UV irradiation = 5129). ) And light resistance was inferior.

Table 5 shows details of the transparent light-scattering layers used in Examples B1 to 6 and Comparative Examples B1 and B2.

Table 6 shows the results of various physical properties and performance evaluations of the sheet-like transparent molded bodies used in Examples B1 to B6 and Comparative B1-2.

10, 20 Resin 11, 21 Bright flaky fine particles 12, 22 Substantially spherical fine particles 13, 23 At least one of infrared shielding fine particles and ultraviolet shielding agent 14, 26 Transparent light scattering layer 15, 29, 34 Viewer 16, 27, 36A, 36B Projected light 17, 28, 37A, 37B Scattered light 24 Adhesive layer 25 Base material layer 31 Sheet-like transparent molded body 32 Transparent partition (support)
33 Transparent screen 35A, 35B Projector

Claims (20)

A transparent light scattering layer comprising a resin, at least one of infrared shielding fine particles and an ultraviolet shielding agent, and glittering flaky fine particles;
The glittering flaky fine particles are metal-based particles selected from the group consisting of aluminum, platinum, gold, titanium, nickel, tin, tin-cobalt alloy, indium, chromium, aluminum oxide, and zinc sulfide; Or a glittering material coated with a metal oxide, or a glittering material in which natural metal or synthetic mica is coated with the metal or metal oxide, and the average diameter of primary particles of the glittering flaky fine particles is 0.5 to 100 μm and an average aspect ratio of 3 to 800,
A sheet-like transparent molded article for a transparent screen, having a total light transmittance of 70% or more.   The infrared ray shielding fine particles are at least one selected from the group consisting of lanthanum hexaboride, cesium tungsten oxide, indium tin oxide, tin antimony oxide, titanium oxide, zinc oxide, and palladium. Sheet-like transparent molded body.   The average diameter of the primary particles of the infrared shielding fine particles is 1 nm to 10 µm, and the content of the infrared shielding fine particles is 0.0001 to 5.0 mass% with respect to the resin. The sheet-like transparent molded article according to 1 or 2.   The sheet-like transparent molded body according to any one of claims 1 to 3, wherein the ultraviolet shielding agent is a metallic ultraviolet shielding agent or an organic ultraviolet shielding agent.   The sheet-like transparent molding according to claim 4, wherein the organic ultraviolet shielding agent is at least one selected from the group consisting of a benzotriazole ultraviolet absorber, a triazine ultraviolet absorber, and a benzophenone ultraviolet absorber. body.   The sheet-shaped transparent molded body according to any one of claims 1 to 5, wherein a content of the ultraviolet shielding agent is 0.0001 to 5.0 mass% with respect to the resin.   The content of the glittering flaky fine particles is 0.0001 to 5.0% by mass with respect to the resin, and the average diameter of the primary particles of the glittering flaky fine particles is 1 to 50 μm, and The sheet-like transparent molded product according to any one of claims 1 to 6, having an average aspect ratio of 10 to 500.   The sheet-like transparent molded body according to any one of claims 1 to 7, wherein the regular reflectance of the glittering flaky fine particles is 12% or more.   The sheet-like transparent molded body according to any one of claims 1 to 8, wherein the transparent light scattering layer further comprises substantially spherical fine particles having a refractive index of 1.9 to 3.55.   The sheet-like transparent molded article according to claim 9, wherein the substantially spherical fine particles are at least one selected from the group consisting of zirconium oxide, cerium oxide, barium titanate, strontium titanate, and diamond.   The median diameter of the primary particles of the substantially spherical fine particles is 0.1 to 100 nm, and the content of the primary particles of the substantially spherical fine particles is 0.0001 to 2.0% by mass with respect to the resin. The sheet-like transparent molded body according to claim 9 or 10.   The sheet-like transparent molded body according to any one of claims 1 to 11, wherein the haze of the sheet-shaped transparent molded body is 30% or less.   The sheet-like transparent molded body according to any one of claims 1 to 12, wherein a shielding coefficient of the sheet-shaped transparent molded body is 0.90 or less.   The sheet-like transparent molded article according to any one of claims 1 to 13, wherein the image clarity of the sheet-like transparent molded article is 70% or more.   The building member provided with the sheet-like transparent molded object as described in any one of Claims 1-14.   The member for vehicles provided with the sheet-like transparent molded object as described in any one of Claims 1-14.   A transmissive transparent screen comprising the sheet-like transparent molded body according to any one of claims 1 to 14.   A reflective transparent screen comprising the sheet-like transparent molded body according to any one of claims 1 to 14. An image projection system comprising: the sheet-like transparent molded body according to any one of claims 1 to 14 or the transmissive transparent screen according to claim 17 ; and a projection device. A video projection system comprising: the sheet-like transparent molded body according to any one of claims 1 to 14 or the reflective transparent screen according to claim 18 ; and a projection device.

Images