CN111868576A - Light scattering body, composition for forming light scattering body, sheet-like laminate, projection screen, light diffusion sheet, and illumination device incorporating light intensifier - Google Patents
Light scattering body, composition for forming light scattering body, sheet-like laminate, projection screen, light diffusion sheet, and illumination device incorporating light intensifier Download PDFInfo
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- CN111868576A CN111868576A CN201980020540.7A CN201980020540A CN111868576A CN 111868576 A CN111868576 A CN 111868576A CN 201980020540 A CN201980020540 A CN 201980020540A CN 111868576 A CN111868576 A CN 111868576A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
- G03B21/62—Translucent screens
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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- General Engineering & Computer Science (AREA)
- Optical Elements Other Than Lenses (AREA)
- Overhead Projectors And Projection Screens (AREA)
Abstract
The light scattering body (5) of the present invention comprises: a resin medium (3) containing a resin, and hollow particles (1) and light-scattering particles (2) dispersed in the resin medium (3). The refractive index of the resin medium (3) is lower than the refractive index of the light scattering particles (2).
Description
Technical Field
The present invention relates to a light scattering body, a composition for forming a light scattering body, a sheet laminate, a projection screen, a light diffusing sheet, and an illumination device incorporating a light intensifier.
Background
Reflective screens, which project images projected by a projector onto a screen and view the images from the projector side, and transmissive screens, which view the images from the back, are used in various fields such as home theaters, digital signage, and advertising media for events.
As such a screen, for example, a screen including a layer in which bubbles are contained in a base material to reflect incident light is known.
Patent document 1 discloses a technique of using a polyester resin foam sheet containing oriented elliptical cells having an average cell diameter of 12 μm or less as a reflection sheet for image projection.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2009-175522
Patent document 2: japanese patent laid-open No. 2008-64951
Patent document 3: japanese patent laid-open publication No. 2006-243453
Patent document 4: japanese patent laid-open publication No. 2006-23342
Patent document 5: japanese patent laid-open publication No. 2003-330120
Patent document 6: japanese patent laid-open publication No. 2004-62143
Disclosure of Invention
Problems to be solved by the invention
However, as a result of studies by the present inventors, it has been found that the screens of patent documents 1 to 6 have insufficient visibility because the sharpness and brightness of the projected image are insufficient.
The present invention has been made in view of the above-described technical problems, and an object of the present invention is to provide a light scattering body capable of projecting a clear and bright image, a composition for forming a light scattering body capable of forming the same, and a sheet laminate, a projection screen, a light diffusing sheet, and an illumination device incorporating a light intensifier, each using the light scattering body.
Means for solving the problems
The present inventors have made extensive studies to achieve the above object, and as a result, have completed the following inventions.
The invention provides a light scattering body, which is formed by dispersing hollow particles and light scattering particles in a resin medium with a lower refractive index than the light scattering particles.
The light scattering particles are preferably diamond.
The hollow particle preferably has a pore diameter of 0.78 to 300 μm.
The present invention also provides a composition for forming a light scattering body, which contains a hollow particle precursor, a light scattering particle, and a resin, and the refractive index of the light scattering particle is higher than the refractive index of the resin.
The sheet laminate of the present invention comprises a base material and a light scattering layer provided on the base material and containing the light scattering body.
The projection screen of the present invention includes the light scattering body or the sheet laminate.
The light diffusion sheet of the present invention includes a light diffusion layer including the light scattering body.
The lighting device with the built-in light intensifier of the invention comprises: a light intensifier including the light scattering body or the sheet laminate; and a light source.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, a light scattering body capable of projecting a clear and bright image, a composition for forming a light scattering body capable of forming the same, and a sheet laminate, a projection screen, a light diffusing sheet, and an illumination device incorporating a light intensifier, each using the light scattering body, can be provided.
Drawings
Fig. 1 is a schematic cross-sectional view illustrating a light scattering body according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view showing a sheet laminate according to an embodiment of the present invention.
Fig. 3 is a schematic cross-sectional view showing a sheet laminate according to an embodiment of the present invention.
Fig. 4 is a layout diagram of a light scattering measurement of the sheet laminate according to the embodiment of the present invention.
Fig. 5 is an angular distribution diagram of the light scattering intensity of the sheet laminate according to the embodiment of the present invention.
FIG. 6 is a schematic cross-sectional view showing a composite light diffusion sheet according to an embodiment of the present invention.
Fig. 7 is a schematic cross-sectional view showing a lighting device incorporating a light booster according to an embodiment of the present invention.
Detailed Description
The following describes an embodiment of the present invention in detail. However, the present invention is not limited to the following embodiments.
[ light scatterer ]
The light scattering body of the present embodiment includes a resin medium, hollow particles dispersed in the resin medium, and light scattering particles dispersed in the resin medium. The refractive index of the resin medium is lower than that of the light scattering particles.
Fig. 1 is a schematic cross-sectional view showing a light scattering body according to the present embodiment. The light scattering body 5 shown in fig. 1 includes a resin medium 3, and hollow particles 1 and light scattering particles 2 dispersed in the resin medium 3.
First, the resin medium will be described. The resin medium contains at least a resin as a constituent component, and the resin functions as a matrix resin for fixing the hollow particles and the light scattering particles in the light scattering body, for example.
The resin medium may be formed of a resin composition containing a resin.
Examples of the resin include thermoplastic resins and thermosetting resins, and specifically, polycarbonate resins, polyurethane resins, polyacrylic resins, polystyrene resins, polyolefin resins, vinyl resins, polyester resins, polyether resins, fluorine resins, polysulfone resins, polyether ether ketone resins, polyamide resins, polyimide resins, melamine resins, phenol resins, epoxy resins, silicone resins, cellulose resins, silicone-modified acrylic resins, and the like. When these resins are used, the difference in refractive index between the light scattering particles and the resin tends to be easily obtained, and the visibility tends to be further excellent. The resin medium preferably contains a urethane resin, a polyacrylic resin, or a silicone-modified acrylic resin, and more preferably contains a silicone-modified acrylic resin, from the viewpoint of preventing aggregation of light scattering particles contained in the light scattering body. The resin medium may contain 1 kind of resin alone or 2 or more kinds of resins.
The resin composition may contain other components than the resin. Examples of the other components include: anionic surfactants, cationic surfactants, nonionic surfactants, amphoteric surfactants, preservatives, light stabilizers, ultraviolet absorbers, antioxidants, polymerization inhibitors, silicone defoamers, leveling agents, tackifiers, anti-settling agents, anti-dripping agents, flame retardants, fluorescent brighteners, viscosity stabilizers, pH adjusters, various additives for organic/inorganic pigments/dyes, addition aids, antistatic agents, matting agents, and the like. Among these, the respective surfactants are preferably contained from the viewpoint of preventing aggregation of light scattering particles and the like contained in the light scattering body. The surfactant is preferably an anionic surfactant or a nonionic surfactant; more preferably, anionic surfactants such as alkylbenzenesulfonates, polyoxyethylene alkylphenylether sulfate salts, styrenated phenol alkylene oxide adduct sulfate salts, alkylnaphthalenesulfonates, naphthalenesulfonic acid-formaldehyde condensate salts, and alkyldiphenylether disulfonates; nonionic surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene sorbitan fatty acid partial esters (part エステル), polyoxyethylene glycerin fatty acid partial esters, polyoxyethylene glycol fatty acid esters, polyoxyethylene polyoxypropylene block polymers, and polyethylene glycol mono (styrylphenyl) ethers; further preferably a styrenated phenol alkylene oxide adduct sulfuric acid ester salt, an alkylnaphthalene sulfonate or a naphthalenesulfonic acid formaldehyde condensate salt; particularly preferred is a styrenated phenol alkylene oxide adduct sulfuric acid ester salt or a naphthalenesulfonic acid formaldehyde condensate salt.
The refractive index of the resin medium is preferably 1.28 or more and less than 1.80, more preferably 1.30 or more and 1.60 or less, and still more preferably 1.40 or more and 1.60 or less. The refractive index in this specification means a measurement at a wavelength of 589.3nm of a sodium lamp.
The content of the resin medium in the light scattering body is preferably 40 to 95% by mass, and more preferably 50 to 90% by mass, based on the total amount of the light scattering bodies, from the viewpoint of dispersibility of the particles.
The hollow particles have a hollow structure with a hollow hole surrounded by a thin layer.
As the hollow particles, hollow polymers having pores may be used as they are, or they may be formed by treating precursors which form hollow particles by a treatment such as heating. Examples of the precursor for forming the hollow particles by a treatment such as heating include heat-expandable microcapsules.
The hollow particle has a pore diameter of preferably 0.78 to 300. mu.m, more preferably 0.9 to 100. mu.m, and still more preferably 0.9 to 30 μm, from the viewpoint of visibility. The pore diameter can be determined by measuring the pore diameter (diameter) of each particle for any 50 or more hollow particles by scanning microscope measurement and arithmetically averaging the pore diameters. In the observation photograph (figure), when the shape of the hollow hole is not a true circle, the diameter of the maximum inscribed circle of the cross section of the hollow hole is measured.
Examples of the material of the thin layer of hollow particles include: inorganic substances such as silicon oxide, glass, titanium oxide, and aluminum oxide; organic materials such as phenol resins, epoxy resins, acrylic resins, styrene resins, and urea resins. Among these, from the viewpoint of visibility, organic resins such as acrylic resins, styrene resins, and urea resins are preferable, and acrylic resins or styrene resins are more preferable.
The hollow polymer is a capsule in which a gas such as air is sealed. Examples of the material of the hollow polymer include inorganic substances such as silica, glass, titanium oxide, and alumina; organic materials such as phenol resins, epoxy resins, acrylic resins, styrene resins, and urea resins.
The heat-expandable microcapsule is a structure in which a heat-expandable gas is enclosed inside a core, and the enclosed heat-expandable gas is expanded by heating, thereby forming hollow particles having a hollow structure. The gas inside the core may be a low boiling point hydrocarbon. Examples of the material constituting the thin layer of the thermally expandable microcapsule include: inorganic substances such as silicon oxide, glass, titanium oxide, and aluminum oxide; organic materials such as phenol resins, epoxy resins, acrylic resins, styrene resins, and urea resins.
The thickness of the thin layer of the hollow particles is preferably 1.0nm to 10 μm from the viewpoint of visibility and structural stability of the hollow particles. When the material of the thin layer is titanium oxide or aluminum oxide, the thickness of the thin layer is preferably 1.0nm to 1 μm. The measurement was performed by a scanning electron microscope, and the thin layer of each particle was measured for any 50 or more hollow particles, and the results were obtained by arithmetic mean. In the observation photograph (figure), when the thickness of the thin layer is not constant, the maximum value and the minimum value of the thin layer are measured and averaged.
The content of the hollow particles is preferably 3 to 50% by mass, more preferably 5 to 40% by mass, based on the total amount of the light scattering bodies, from the viewpoint of visibility.
The light scattering particles may have a refractive index higher than that of the resin medium. As components constituting the light scattering particles, for example: diamond; metal oxides such as zirconium oxide, titanium oxide, barium titanate, strontium titanate, aluminum oxide, zinc oxide, copper oxide, cesium oxide, chromium oxide, niobium oxide, cerium oxide, indium tin oxide, and tantalum oxide; metals such as aluminum, nickel, cobalt, iron, titanium, chromium, zinc, tungsten, mercury, platinum, molybdenum, and the like; and resins such as polycarbonate resins, polyurethane resins, polyacrylic resins, polystyrene resins, polyvinyl alcohol resins, polyolefin resins, polyvinyl olefin resins, cycloolefin resins, polyester resins, polyether resins, fluorine resins, polysulfone resins, polyether ether ketone resins, polyamide resins, polyimide resins, melamine resins, phenol resins, epoxy resins, silicone resins, cellulose resins, and silicone-modified acrylic resins.
Among these, the refractive index is preferably 1.8 or more, more preferably 2.0 or more, and still more preferably 2.2 or more. The upper limit of the refractive index is not particularly limited, and may be set to 4.0 or less, for example.
As the material having a refractive index of 1.8 or more, there can be mentioned: diamond; metal oxides such as zirconium oxide, titanium oxide, barium titanate, strontium titanate, zinc oxide, copper oxide, cesium oxide, chromium oxide, niobium oxide, cerium oxide, indium tin oxide, and tantalum oxide; nickel, cobalt, iron, titanium, chromium, zinc, tungsten, mercury, platinum, molybdenum, and the like. As the material having a refractive index of 2.0 or more, there can be mentioned: diamond; metal oxides such as zirconium oxide, titanium oxide, barium titanate, strontium titanate, zinc oxide, copper oxide, cesium oxide, chromium oxide, niobium oxide, cerium oxide, indium tin oxide, and tantalum oxide; cobalt, iron, titanium, chromium, zinc, tungsten, mercury, platinum, molybdenum and other metals. Among these, diamond, metal oxide, and metal are preferable from the viewpoint of effectively scattering light, and diamond is more preferable from the viewpoint of visibility and a high viewing angle. The light-scattering particles may contain these components alone or 2 or more. Further, as the light scattering particles, 1 kind of particles containing the same constituent component may be used, or plural kinds of particles having different constituent components may be used.
There are many kinds of diamond depending on the production method and the purification method, and any of them can be used. Examples thereof include: natural diamond; synthetic diamonds such as high-pressure synthetic diamonds, explosion synthetic diamonds, vapor-phase grown diamonds, and the like.
In addition, the diamond is divided into 2 kinds of single crystal diamond and polycrystalline diamond according to the morphological structure of the crystal, and the single crystal diamond and the polycrystalline diamond can be used alone or mixed.
The median particle diameter of the light-scattering particles is preferably 40nm to 10 μm, and more preferably 70nm to 1.0 μm, from the viewpoint of visibility. The light scattering particles may be 1 type or 2 or more types having different median particle diameters. In the present specification, the median diameter refers to a 50% median diameter on a volume basis of the particles, and is measured by using a particle size distribution meter of a laser diffraction scattering method (for example, LA-960, manufactured by horiba, Ltd.).
The shape of the light scattering particles is not particularly limited, and may be, for example: spherical, roughly spherical, spheroid, broken, amorphous, cubic, rectangular, plate, pyramid, cone, phosphor flake, and the like. From the viewpoint of visibility, a spherical shape, a substantially spherical shape, or a shape of a rotating ellipsoid is preferable.
The content of the light scattering particles is preferably 1 to 25% by mass, more preferably 2 to 20% by mass, based on the total amount of the light scattering particles, from the viewpoint of visibility.
The mass ratio of the light-scattering particles to the hollow particles (mass of light-scattering particles/mass of hollow particles) is preferably 0.05 to 0.80, more preferably 0.15 to 0.60, from the viewpoint of visibility.
The refractive index of the light scattering particles is preferably greater than the refractive index of the resin medium by 0.2 or more, more preferably greater than 0.4 or more, and still more preferably greater than 0.6 or more. The upper limit of the difference in refractive index between the light scattering particles and the resin medium is not particularly limited, and may be, for example, 2 or less.
The light scattering body of the present embodiment is preferably sheet-shaped. The thickness is not particularly limited, but is preferably 0.1 to 500 μm, more preferably 0.5 to 80 μm, from the viewpoint of better visibility and better economy. The thickness of the light scatterer in the present specification was measured by using a micrometer (product name: MDH-25M, manufactured by ミツトヨ Co.).
The light scattering body of the present embodiment can be manufactured, for example, by a method including the steps of: a step of applying the following composition for forming a light scattering body on a release substrate; a step of drying or curing the coating film; and a step of peeling the dried product or the cured product from the release substrate.
[ composition for Forming light Scattering ]
The composition for forming a light-scattering body of the present embodiment includes a hollow particle precursor, a light-scattering particle, and a resin.
The composition for forming a light scattering body according to the present embodiment may contain a resin composition.
The same resin composition as that used to form the resin medium in the light scattering body of the present embodiment can be used as the resin composition. The resin composition may contain a polymerizable monomer (for example, a monomer mixture) capable of forming the resin, and a polymerization initiator if necessary, in place of or in combination with the resin. When the resin contained in the resin composition is the above-mentioned resin or a raw material thereof, the dispersibility of the particles is excellent, and thus a light scattering body excellent in visibility is easily obtained. In the present embodiment, a commercially available product as a solution (resin solution) obtained by diluting or dispersing the resin with a solvent may be used.
Examples of the polymerizable monomer include: (meth) acrylic acid; (meth) acrylate compounds such as ethyl (meth) acrylate, methyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isobutyl (meth) acrylate, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, and 4-hydroxybutyl (meth) acrylate; olefin compounds such as ethylene, propylene, butene, hexene, butadiene, and isoprene; halogenated olefin compounds such as vinyl chloride and dichloroethylene; cycloalkene compounds such as cyclohexene; styrene; epoxy compounds such as ethylene oxide and propylene oxide; and silane compounds such as γ -methacryloxypropylalkoxysilane. The polymerizable monomer may be the above-mentioned resin having a polymerizable functional group.
As the polymerization initiator, there can be mentioned: thermal radical polymerization initiators such as azo compounds and peroxides; thermal cationic polymerization initiators such as benzoic acid sulfonate compounds and alkyl sulfonium salts; and photopolymerization initiators such as benzoin compounds and acetophenone compounds.
The content of the resin composition in terms of solid content is preferably 22 to 98.5% by mass, and more preferably 30 to 96% by mass, based on the total amount of the composition for forming light scatterers, from the viewpoint of dispersibility.
As the hollow particle precursor in the composition for forming a light scattering body, a hollow polymer having a hollow hole or the like can be used, or a precursor which forms a hollow particle by a treatment such as heating can be used. As the hollow particle precursor, the same substances as those described in the hollow particles of the present embodiment can be used.
The total content of the hollow particle precursors in the composition for forming a light scatterer is preferably 1.1 to 69.0% by mass, more preferably 2.9 to 56.0% by mass, based on the total amount of the composition for forming a light scatterer, from the viewpoint of dispersibility.
As the light-scattering particles in the light-scattering-body-forming composition, the same light-scattering particles as those of the present embodiment described above can be used.
The total content of the light-scattering particles in the light-scattering-body-forming composition is preferably 0.4 to 9.0% by mass, and more preferably 0.7 to 7.5% by mass, based on the total amount of the light-scattering-body-forming composition, from the viewpoint of dispersibility.
The composition for forming a light scattering body may optionally contain inorganic particles other than light scattering particles, organic particles other than light scattering particles, metal oxide particles other than light scattering particles, a solvent, a polymerization initiator, an anionic surfactant, a cationic surfactant, a nonionic surfactant, an amphoteric surfactant, a preservative, a light stabilizer, an ultraviolet absorber, an antioxidant, a polymerization inhibitor, a silicone defoamer, a leveling agent, a thickener, an anti-settling agent, an anti-dripping agent, a flame retardant, a fluorescent brightener, a viscosity stabilizer, a pH adjuster, various additives of organic/inorganic pigments/dyes, an addition aid, an antistatic agent, a matting agent, and the like. Among these, from the viewpoint of preventing aggregation of light scattering particles and the like contained in the light scattering body, it is preferable to include the respective surfactants. The surfactant is preferably an anionic surfactant or a nonionic surfactant; more preferably, anionic surfactants such as alkylbenzenesulfonates, polyoxyethylene alkylphenylether sulfate salts, styrenated phenol alkylene oxide adduct sulfate salts, alkylnaphthalenesulfonates, naphthalenesulfonic acid-formaldehyde condensate salts, and alkyldiphenylether disulfonates; nonionic surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene sorbitan fatty acid partial esters, polyoxyethylene glycerin fatty acid partial esters, polyoxyethylene glycol fatty acid esters, polyoxyethylene polyoxypropylene block polymers, and polyethylene glycol mono (styrylphenyl) ethers; further preferably a styrenated phenol alkylene oxide adduct sulfuric acid ester salt, an alkylnaphthalene sulfonate or a naphthalenesulfonic acid formaldehyde condensate salt; particularly preferred is a styrenated phenol alkylene oxide adduct sulfuric acid ester salt or a naphthalenesulfonic acid formaldehyde condensate salt.
Examples of the solvent include: aliphatic hydrocarbon solvents such as hexane, cyclohexane, methylcyclohexane, ethylcyclohexane, heptane, nonane, octane, isooctane, and decane; aromatic hydrocarbon solvents such as benzene, toluene, xylene, cumene and ethylbenzene; ether solvents such as diethyl ether, diisopropyl ether, methyl tert-butyl ether, methyl cellosolve, butyl cellosolve, methyl carbitol, butyl carbitol, diethyl carbitol, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, tetrahydrofuran, 1, 3-dioxane, 1, 4-dioxane, and the like; ketone solvents such as dimethyl ketone, methyl ethyl ketone, diethyl ketone, methyl isobutyl ketone, diisopropyl ketone, diisobutyl ketone, and cyclohexanone; carbonate-based solvents such as dimethyl carbonate, diethyl carbonate, and ethylene carbonate; alcohol solvents such as methanol, ethanol, isopropanol, n-butanol, isobutanol, sec-butanol, cyclohexanol, diacetone alcohol, 3-methoxy-3-methyl-1-butanol, ethylene glycol, and propylene glycol; ester-based solvents such as ethyl acetate, n-butyl acetate, isobutyl acetate, n-pentyl acetate, propylene glycol monomethyl ether acetate, and 3-methoxy-3-methyl-1-butyl acetate; nitrile solvents such as acetonitrile, and aliphatic amide solvents such as N, N-dimethylformamide, N-dimethylacetamide, alkoxy-N-isopropyl-propionamide, and hydroxyalkylamide; alicyclic amide solvents such as N-methyl-2-pyrrolidone and N-ethyl-pyrrolidone; water, and the like. These can be used alone in 1 or a combination of 2 or more.
The method for producing the composition for forming a light scattering body is not particularly limited, and examples thereof include: a method of adding and dispersing a hollow particle precursor and a light scattering particle to a resin composition.
Examples of the method for dispersing the hollow particle precursor and the light-scattering particles include conventionally known mixing and dispersing methods. In order to further reliably disperse the hollow particle precursors and the light scattering particles, it is preferable to perform a dispersion treatment using a dispersing machine.
Examples of the dispersing machine include: mixers such as a disperser, a homogenizer, a planetary mixer (PRIMIX corporation), a revolution and rotation mixer (for example, "debubbling and tara" manufactured by シンキー corporation); a homogenizer ("Clearmix" manufactured by M-Technique corporation); a media type dispersing machine such as a paint conditioner (manufactured by レッドデビル Co.), a ball MILL, a sand MILL ("DYNO-MILL" manufactured by シンマルエンタープライゼス Co.), an attritor, a bead MILL ("DCP Mill" manufactured by Eirich Co.), and Coball Mill; a wet jet mill (e.g., "ジーナス PY" manufactured by ジーナス, Starburst manufactured by Sugino Machine, and "Nanomizer" manufactured by Nanomizer); a non-medium disperser ("Clear SS-5" manufactured by M-Technique, Inc., and "MICROROS" manufactured by Nara machinery, Inc.); and a roller mill and the like.
< sheet-like laminate >
Fig. 2 and 3 are schematic cross-sectional views showing an embodiment of the sheet laminate. The sheet laminate 6 of the present embodiment shown in fig. 2 and 3 includes a base material 4, and a light scattering layer including the light scattering body 5 of the present embodiment provided on the base material 4. Fig. 2 is a diagram showing a case where the particle diameters of the hollow particles 1 and the light scattering particles 2 are smaller than the thickness of the light scattering body 5, and fig. 3 is a diagram showing a case where the particle diameters of the hollow particles 1 are larger than the thickness of the light scattering body 5. As shown in fig. 3, the hollow particles 1 and/or the light scattering particles 2 may protrude out of the resin medium 3.
The substrate is not particularly limited as long as it does not inhibit the optical properties of the sheet laminate, and specifically, there may be mentioned: soda-lime glass, lead glass, borosilicate glass, and the like; plastics such as polyester resins, polycarbonate resins, polyolefin resins, polyacrylic resins, cellulose resins, and polyvinyl resins; quartz; metal oxides such as aluminum oxide, titanium oxide, niobium oxide, tantalum oxide, indium tin oxide, zinc oxide, zirconium oxide, and cerium oxide; alloys such as steel, carbon steel, chromium-molybdenum steel, aluminum alloy, stainless steel alloy, copper alloy, titanium alloy, and the like; metals such as gold, silver, copper, zinc, iron, aluminum, platinum, lead, palladium, and the like; plant fibers such as cotton and hemp; animal fibers such as silk, wool, alpaca, angora rabbit hair (アンゴラ), kefir goat hair, and mohair; synthetic fibers such as rayon, polyacetate, Promix, nylon, polyester, polyacrylic, polyvinyl chloride, and polyurethane; inorganic fibers such as glass fibers, metal fibers, and carbon fibers.
When used as a transmission type screen, a transparent substrate is preferable. Specific examples of the transparent substrate include glass and plastic.
The thickness of the base material is not particularly limited, but is preferably 1 μm to 50mm, more preferably 20 μm to 30mm, from the viewpoint of strength and economy.
The light scattering layer includes the light scattering body of the present embodiment described above, and can be formed using a composition for forming a light scattering body.
The thickness of the light scattering layer is preferably 0.1 to 500 μm, more preferably 0.5 to 80 μm, from the viewpoint of excellent visibility and economy. The thickness of the light-scattering layer was measured using a micrometer (manufactured by ミツトヨ, trade name: MDH-25M).
The sheet-like laminate of the present embodiment may be provided with a known hard coat layer, an antistatic layer, an anti-fingerprint film layer, or a matte layer on at least one outermost surface thereof to improve the strength of the film.
The adhesive layer may be provided by applying an adhesive to the substrate side of the sheet laminate.
When a projection image is projected, the sheet laminate of the present embodiment can be used for either of a reflection type and a transmission type. In the case of the transmissive type, the substrate is not particularly limited as long as the optical characteristics are not impaired.
The sheet laminate of the present embodiment can be formed into a sheet laminate excellent in flame retardancy by adding an appropriate amount of a flame retardant such as antimony trioxide, antimony pentoxide, aluminum hydroxide, magnesium hydroxide, melamine cyanurate, BestBoron, or Soufa to a light-scattering-body-forming composition and using flame-retardant vinyl chloride, a flame-retardant polyethylene terephthalate (ポリエチテンレテフタレート) film, a polyphenylene sulfide film, an aromatic polyamide film, or a flame-retardant polycarbonate film as a base material.
The sheet laminate of the present embodiment can be produced, for example, by a method including the steps of: coating a composition for forming a light scattering body, which contains a composition for a resin, a hollow particle precursor, and light scattering particles, on a base material; and a step of drying or curing the coating film. In addition, another method includes a method including a step of laminating a sheet-like light scattering body on a base material.
The method of applying the light-scattering body-forming composition is not particularly limited, and may be appropriately selected depending on the shape of the release substrate or the substrate, and examples thereof include: a slide droplet (slide bead) system, a slide curtain (slide curve) system, an extrusion system, a slit die system, a gravure roll system, an air knife system, a blade coating system, a bar coating system, and the like.
As a method for drying or curing the formed coating film, a method of heating with a warm air dryer, an infrared dryer, or the like can be used. When the resin composition is an aqueous emulsion, the resin can be cured by heating the water dispersed in the emulsion with a warm air dryer, an infrared dryer, or the like to evaporate the water contained in the coating film. When the resin composition contains a monomer and a polymerization initiator, the coating film may be heated as necessary to remove the solvent in the coating film, and then irradiated with an active energy ray such as ultraviolet ray, electron beam, infrared ray, visible ray, X-ray, α -ray, γ -ray, or heavy particle ray to polymerize the monomer and polymerize it to form a polymer, thereby curing the coating film.
The thickness of the coating film of the light scattering material forming composition is preferably 0.1 to 500 μm, more preferably 0.5 to 80 μm, in terms of visibility and economy, as the thickness of the light scattering material (for example, the thickness of the light scattering material 5) after drying.
When the light scattering body is formed on the release substrate, the light scattering body may be peeled off from the release substrate to obtain a sheet-like light scattering body. The method of peeling from the release substrate is not particularly limited, and examples thereof include seal peeling, physical peeling, and addition of a peeling agent.
Examples of the method of laminating the sheet-like light scattering body formed on the release substrate to the substrate include bonding with an optical adhesive, and thermal fusion bonding.
< projection Screen >
The projection screen of the present embodiment includes the light scattering body of the present embodiment or the sheet laminate of the present embodiment. The projection screen of the present embodiment may be a transmission type screen capable of recognizing an image from the side of transmitting to the light source, or may be a reflection type screen capable of recognizing an image from the side of reflecting to the light source.
The projection screen of the present embodiment may be configured by a light scattering body or a sheet laminate alone, but preferably has a function of fixing the light scattering body or the sheet laminate in space when an image is projected by a projection source.
Specifically, a fixing member may be attached to the entire upper portion or a part of the sheet-like stacked body. In order to prevent image blurring or distortion, the fixing function is preferably capable of maintaining the sheet laminate in a flat state without bending.
The projection screen of the present embodiment preferably includes a storage means capable of storing the sheet laminate in a roll shape. The storage means may be a take-up type storage device. In this case, the image projection unit of the sheet laminate can be protected when the projection screen is not used, and storage, portability, transportability, and the like can be improved.
The projection screen of the present embodiment may have a weight in a lower portion of the sheet laminate in order to suppress the projection surface from being curved or deformed by wind, vibration, or the like. By applying a force of 1kg to 500kg as a weight, the flatness of the image projection surface is easily maintained, and distortion of the projected image is eliminated.
The projection screen of the present embodiment may be a projection screen in which a light scattering body or a sheet-like laminated body is provided on a substrate having a curved surface. In this case, the light scattering body or the sheet-like laminate may be bonded or adhered to the curved base material, or the light scattering body may be formed by directly applying the above-mentioned composition for forming a light scattering body to the surface of the curved base material.
In this case, a transmission type curved transparent screen or a reflection type curved transparent screen suitable for a curved image, projection of a stereoscopic image, and projection onto a stereoscopic curved surface can be configured.
The light scattering body or the sheet laminate of the present embodiment can be used as a light diffusion sheet capable of reducing the directivity of light.
Further, the light scattering body or the sheet-like laminated body of the present embodiment can be used as a composite light diffusion sheet for further amplifying the light scattering effect by forming it on another light diffusion sheet. For example, when an LED (light emitting diode) or an LD (laser diode) is used as a light source for illumination, the use of the composite light scattering sheet can effectively scatter light, increase the scattering angle to an angle suitable for use, and uniformly scatter illumination light indoors or outdoors.
A light intensifier for illumination can be constituted using the light scattering body or the sheet laminate of the present embodiment. By using a light scattering body or a sheet-like laminate as a light intensifier for illumination, light scattering can be efficiently performed with an extremely simple configuration.
The sheet laminate or the projection screen of the present embodiment may be used for a vehicle member. For example, a sheet laminate or a projection screen may be bonded to the surfaces of the side window and the rear window to provide a function of displaying an image on the side window and the rear window.
The sheet laminate or the projection screen of the present embodiment may be used for a building member. For example, a sheet laminate or a projection screen may be attached to a transparent window material, and an image may be projected by a projector to be used as an advertisement or information provision for a store.
Examples
The present invention is described in detail below with reference to examples, but the present invention is not limited to the examples.
As described below, a material and a base material for preparing the composition for forming a light scattering body were prepared.
[ resin composition ]
Acrylic resin composition: EK-61 (manufactured by Saiden Chemical Industry Co., Ltd., nonvolatile content: 39.2%), refractive index: 1.49.
urethane resin composition: エバファノール HA-170 (manufactured by Riwa chemical Co., Ltd., nonvolatile matter: 36.5 mass%, refractive index: 1.50).
Silicone-modified acrylic resin: MX-9012 (manufactured by Mitsubishi chemical corporation, nonvolatile component: 49.6%), refractive index: 1.45.
[ hollow particle precursor ]
Hollow polymer: ローペイク SN-1055 (nonvolatile content: 26.5% manufactured by Dow Coating Materials Co., Ltd.), median diameter: 1.7 μm, thickness of thin layer: 350nm, material quality: styrene resin
Thermally expanding the microcapsules: expancel 053-40 (made by Fillite, Japan, nonvolatile content: 100%), median particle diameter: 14 μm, material: acrylic resin
[ light-scattering particles ]
Diamond 1: (Single crystal diamond having a median particle diameter of 200nm and a refractive index of 2.42, manufactured by RZ Co., Ltd.)
2, diamond: (polycrystalline diamond, median particle diameter: 500nm, refractive index: 2.42, manufactured by RZ Co.)
Titanium oxide: (made by Sakai chemical Co., Ltd., type: SA-1, median particle diameter: 150nm, refractive index: 2.52)
[ surfactant ]
Surfactant 1: 50.0% by mass aqueous solution of sulfuric acid ammonium salt as additive of 3 mol propylene oxide to 9 mol pentastyrenated phenol ethylene oxide
Surfactant 2: 50.0 mass% aqueous solution of 100 mol adduct of tristyrenated phenol propylene oxide
Surfactant 3: aqueous solution of Na salt of formalin condensate of β -naphthalenesulfonic acid at 50.0 mass% (trade name: Demol NL, manufactured by Kao corporation)
[ base Material ]
Polyester resin: PET film (Toyo Boseki Co., Ltd., A4300 thickness 100 μm)
< preparation of composition for Forming light Scattering >
(preparation of composition for Forming light scatterer 1)
1.5g of diamond 1 and 76.5g of EK-61 were added to a 200ml stainless steel pot (ステンポット), and the mixture was mixed and dispersed at 4000rpm for 30 minutes by using a homogenizer (ROBOMICS (fModel) manufactured by Primix, Inc.), followed by filtration using #2000 yarn to obtain a diamond-dispersed resin composition. No aggregates were found on the yarn. Next, 22.0g of a hollow polymer was added to the diamond-dispersed resin composition, and ultrasonic dispersion treatment was performed for 5 minutes using an ultrasonic dispersion apparatus (manufactured by AS ONE). Thus, a light-scattering-body-forming composition 1 was obtained.
(preparation of composition for Forming light scatterer 2)
A light-scattering-body-forming composition 2 was prepared in the same manner as the light-scattering-body-forming composition 1 except that 1.7g of diamond 1, 85.8g of EK-61, and 12.5g of a hollow polymer were added to a stainless steel can. Furthermore, no aggregates were found on the yarn.
(preparation of composition for Forming light scatterer 3)
A light-scattering-body-forming composition 3 was prepared in the same manner as the light-scattering-body-forming composition 1 except that 1.3g of diamond 1, 61.7g of EK-61, and 37.0g of a hollow polymer were added to a stainless steel can. Furthermore, no aggregates were found on the yarn.
(preparation of composition for Forming light scatterer 4)
A light-scattering-body-forming composition 4 was prepared in the same manner as the light-scattering-body-forming composition 1 except that 1.5g of diamond 1, 0.2g of diamond 2, 76.5g of EK-61, and 22.0g of a hollow polymer were added to a stainless steel can. Furthermore, no aggregates were found on the yarn.
(preparation of composition for Forming light scatterer 5)
A light scatterer-forming composition 5 was prepared in the same manner as the light scatterer-forming composition 1 except that 1.8g of diamond 1, 91.4g of EK-61, and 6.8g of heat-expandable microcapsules in place of the hollow polymer were added to a stainless steel can. Furthermore, no aggregates were found on the yarn.
(preparation of composition for Forming light scatterer 6)
A light scatterer-forming composition 6 was prepared in the same manner as the light scatterer-forming composition 1 except that 1.6g of diamond 1, 0.2g of diamond 2, 91.4g of EK-61, and 6.8g of heat expansion microcapsules in place of the hollow polymer were added to a stainless steel can. Furthermore, no aggregates were found on the yarn.
(preparation of composition for Forming light scatterer 7)
A light scatterer-forming composition 7 was prepared in the same manner as the light scatterer-forming composition 1 except that 1.5g of titanium oxide in place of diamond 1, 76.5g of EK-61, and 22.0g of a hollow polymer were added to a stainless steel can. Furthermore, no aggregates were found on the yarn.
(preparation of composition for Forming light scatterer 8)
A light scatterer-forming composition 8 was prepared in the same manner as the light scatterer-forming composition 1 except that 1.5g of diamond 1, 82.2g of HA-170 instead of EK-61, and 22.0g of a hollow polymer were added to a stainless steel can. Furthermore, no aggregates were found on the yarn.
(preparation of composition for Forming light scatterer 9)
A light-scattering-body-forming composition 9 was prepared in the same manner as the light-scattering-body-forming composition 1 except that diamond 1 was not added to the stainless steel can, 63.0g of EK-61 and 37.0g of hollow polymer were added. Furthermore, no aggregates were found on the yarn.
(preparation of composition for Forming light scatterer 10)
A light scatterer-forming composition 10 was prepared in the same manner as the light scatterer-forming composition 1 except that 1.7g of diamond 1 and 98.3g of EK-61 were added to a stainless steel can, and no hollow polymer was added. Furthermore, no aggregates were found on the yarn.
(preparation of composition for Forming light scatterer 11)
A light scatterer-forming composition 11 was prepared in the same manner as the light scatterer-forming composition 1 except that 1.25g of diamond 1, 0.13g of diamond 2, 50.77g of MX-9012, 18.53g of a hollow polymer, and 29.32g of ion-exchanged water were added to a stainless steel can. Furthermore, no aggregates were found on the yarn during filtration.
(preparation of composition for Forming light scatterer 12)
A light scatterer-forming composition 12 was prepared in the same manner as the light scatterer-forming composition 1 except that 1.25g of diamond 1, 0.13g of diamond 2, 47.80g of MX-9012, 18.57g of a hollow polymer, 3.00g of a surfactant 1, and 29.25g of ion-exchanged water were added to a stainless steel can. Furthermore, no aggregates were found on the yarn during filtration.
(preparation of composition for Forming light scatterer 13)
A light scatterer-forming composition 13 was prepared in the same manner as the light scatterer-forming composition 1 except that 1.25g of diamond 1, 0.13g of diamond 2, 47.80g of MX-9012, 18.57g of a hollow polymer, 3.00g of a surfactant 2, and 29.25g of ion-exchanged water were added to a stainless steel can. Furthermore, no aggregates were found on the yarn during filtration.
(preparation of composition for Forming light scatterer 14)
A light scatterer-forming composition 14 was prepared in the same manner as the light scatterer-forming composition 1 except that 1.25g of diamond 1, 0.13g of diamond 2, 47.80g of MX-9012, 18.57g of a hollow polymer, 3.00g of a surfactant 3, and 29.25g of ion-exchanged water were added to a stainless steel can. Furthermore, no aggregates were found on the yarn during filtration.
The compositions of the compositions 1 to 14 for forming a light scattering body are shown in table 1.
[ Table 1]
[ Table 1]
< production of sheet-like laminate >
(example 1)
The solid content concentration of the mixture on one surface of the substrate was 40g/m2The light-scattering-body-forming composition was applied by using a slide droplet application apparatus (Table coater manufactured by Mitsui electric Finisher, model TC-3)1. Thereafter, the sheet was dried in an oven at 100 ℃ for 2 minutes to prepare a sheet-like laminate having a light scattering layer containing a light scatterer provided on a substrate. The thickness of the light scattering layer was 14.2 μm, the pore diameter of the hollow particles was 1.0 μm, and the thickness of the thin layer of the hollow particles was 0.35 μm.
The pore diameter and the thickness of the thin layer of the hollow particles were calculated based on the obtained image data by imaging the range of the hollow particles by arbitrarily setting the observation magnification so that the hollow particles enter 50 or more but less than 60 in the field of view with a scanning electron microscope (manufactured by japan electronics corporation). The image data was read into image analysis software "particle analysis" (manufactured by Nikkaido gold technologies Co., Ltd.), and the average value of diameters of maximum inscribed circles of cross sections of the hollow diameters of 50 hollow particles was calculated as the hollow diameter. Further, the thickness of the thin layer of 50 hollow particles was measured, and the arithmetic average of these was taken as the thickness of the thin layer. In the image data, when the thickness of the thin layer is not fixed, the maximum value and the minimum value of the thickness of the thin layer are measured and averaged.
(example 2)
The solid content concentration of the composition for forming a light scattering body was 60g/m2A sheet laminate was produced in the same manner as in example 1, except that coating was performed in the same manner as in example 1. The thickness of the light scattering layer was 19.6 μm, the pore diameter of the hollow particles was 1.0 μm, and the thickness of the thin layer of the hollow particles was 0.35 μm.
(example 3)
The solid content concentration of the composition for forming a light scattering body was 80g/m2A sheet laminate was produced in the same manner as in example 1, except that coating was performed in the same manner as in example 1. The thickness of the light scattering layer was 28.1 μm, the pore diameter of the hollow particles was 1.0 μm, and the thickness of the thin layer of the hollow particles was 0.35 μm.
(example 4)
A sheet laminate was produced in the same manner as in example 1, except that the light diffuser forming composition 2 was used instead of the light diffuser forming composition 1. The thickness of the light scattering layer was 13.8 μm, the pore diameter of the hollow particles was 1.0 μm, and the thickness of the thin layer of the hollow particles was 0.35 μm.
(example 5)
A sheet laminate was produced in the same manner as in example 1, except that the composition for forming a light diffuser 3 was used instead of the composition for forming a light diffuser 1. The thickness of the light scattering layer was 14.0. mu.m, the pore diameter of the hollow particles was 1.0. mu.m, and the thickness of the thin layer of the hollow particles was 0.35. mu.m.
(example 6)
A sheet laminate was produced in the same manner as in example 1, except that the light-scattering body-forming composition 4 was used instead of the light-scattering body-forming composition 1. The thickness of the light scattering layer was 14.1 μm, the pore diameter of the hollow particles was 1.0 μm, and the thickness of the thin layer of the hollow particles was 0.35 μm.
(example 7)
A sheet laminate was produced in the same manner as in example 1, except that the light-scattering body-forming composition 5 was used instead of the light-scattering body-forming composition 1. The thickness of the light scattering layer was 27.4 μm, the pore diameter of the hollow particles was 26.6 μm, and the thickness of the thin layer of the hollow particles was 0.40 μm.
(example 8)
A sheet laminate was produced in the same manner as in example 1, except that the light diffuser forming composition 6 was used instead of the light diffuser forming composition 1. The thickness of the light scattering layer was 27.0 μm, the pore diameter of the hollow particles was 26.2 μm, and the thickness of the thin layer of the hollow particles was 0.40 μm.
(example 9)
A sheet laminate was produced in the same manner as in example 1, except that the composition for forming a light diffuser 7 was used instead of the composition for forming a light diffuser 1. The thickness of the light scattering layer was 14.3 μm, the pore diameter of the hollow particles was 1.0 μm, and the thickness of the thin layer of the hollow particles was 0.35 μm.
(example 10)
A sheet laminate was produced in the same manner as in example 1, except that the composition for forming a light diffuser 8 was used instead of the composition for forming a light diffuser 1. The thickness of the light scattering layer was 13.8 μm, the pore diameter of the hollow particles was 1.0 μm, and the thickness of the thin layer of the hollow particles was 0.35 μm.
Comparative example 1
A sheet laminate was produced in the same manner as in example 1, except that the light diffuser forming composition 9 was used instead of the light diffuser forming composition 1. The thickness of the light scattering layer was 14.1 μm, the pore diameter of the hollow particles was 1.0 μm, and the thickness of the thin layer of the hollow particles was 0.35 μm.
Comparative example 2
A sheet laminate was produced in the same manner as in example 1, except that the light diffuser forming composition 10 was used instead of the light diffuser forming composition 1. The thickness of the light scattering body was 14.3 μm.
(example 17)
A sheet laminate was produced in the same manner as in example 1, except that the light diffuser forming composition 11 was used instead of the light diffuser forming composition 1. The thickness of the light scattering layer was 14.2 μm, the pore diameter of the hollow particles was 1.0 μm, and the thickness of the thin layer of the hollow particles was 0.40 μm.
(example 18)
A sheet-like laminate was produced in the same manner as in example 1, except that the light diffuser-forming composition 12 was used instead of the light diffuser-forming composition 1. The thickness of the light scattering layer was 14.1 μm, the pore diameter of the hollow particles was 1.0 μm, and the thickness of the thin layer of the hollow particles was 0.40 μm.
(example 19)
A sheet laminate was produced in the same manner as in example 1, except that the light diffuser forming composition 13 was used instead of the light diffuser forming composition 1. The thickness of the light scattering layer was 13.8 μm, the pore diameter of the hollow particles was 1.0 μm, and the thickness of the thin layer of the hollow particles was 0.40 μm.
(example 20)
A sheet laminate was produced in the same manner as in example 1, except that the composition for forming a light diffuser 14 was used instead of the composition for forming a light diffuser 1. The thickness of the light scattering layer was 14.0. mu.m, the pore diameter of the hollow particles was 1.0. mu.m, and the thickness of the thin layer of the hollow particles was 0.40. mu.m.
< evaluation of sheet laminate >
L of the sheet-like laminates of examples 1 to 10, 17 to 20 and comparative examples 1 to 2 was measured by the following method*(brightness). In addition, the evaluation of the sharpness is performed for an image seen from the projector side when the image is projected by the projector and an image seen from the side opposite to the projector side. Further, the appearance of the sheet laminate was evaluated. The results are shown in Table 2.
<Transmitted luminance L*(transmissive mode)>
The brightness of the sheet laminate was measured using a variable angle photometer (product No. GC5000, manufactured by Nippon Denshoku industries Co., Ltd.) according to the following procedure. The incident angle of the light source was set to 20 degrees, and the intensity of transmitted light in the 20-degree direction in a state where nothing was placed on the measurement table was set to 100. The sheet laminate was placed on a measuring table, and the transmission L at 0 degree was measured while keeping the incident angle of the light source at 20 degrees*The value was regarded as luminance. Mixing L with*A value of 1.30 or more is acceptable.
<Reflected brightness L*(reflection mode)>
The brightness of the sheet laminate was measured using a variable angle photometer (product No. GC5000, manufactured by Nippon Denshoku industries Co., Ltd.) according to the following procedure. The incident angle of the light source was set to 20 degrees, and the intensity of the reflected light in the direction of 20 degrees in the state where the standard white plate was placed on the measurement table was set to 100. Next, the sheet laminate was placed on a measuring table in place of the standard white plate, and the reflection L at 0 degree was measured while keeping the incident angle of the light source at 20 degrees*The value was regarded as luminance. Mixing L with*A value of 10 or more is acceptable.
< (1) the sharpness of an image seen from the side opposite to the projector side (transmission mode) >
Images were projected onto the sheet laminates using a digital projector (product name: EH-TW-410, manufactured by Epson corporation), the images projected onto the respective sheet laminates were visually observed from the side opposite to the projector side, and the clarity of the images was evaluated in 4 ranks according to the following criteria. Pass was set to 1 and 2.
(Standard)
Level 1: the outline of the projected image can be seen extremely clearly.
Level 2: the contour of the projected image can be seen sufficiently.
Level 3: the projected image has a shallow profile and is not easy to see.
Level 4: the projected image is blurred and cannot be seen.
< (2) sharpness of image seen from projector side (reflection mode) >
Images were projected onto the sheet laminates by a digital projector (product name: EH-TW-410, manufactured by Epson corporation), and the images projected onto the respective sheet laminates were visually observed from the projector side, and the clarity of the images was evaluated in 4 ranks according to the following criteria. Pass was set to 1 and 2.
(Standard)
Level 1: the outline of the projected image can be seen extremely clearly.
Level 2: the contour of the projected image can be seen sufficiently.
Level 3: the projected image has a shallow profile and is not easy to see.
Level 4: the projected image is blurred and cannot be seen.
< appearance evaluation (aggregate) >
The sheet laminate thus produced was cut into a size of B5, and the surface of the sheet laminate was visually observed to confirm the number of visually observable aggregates, and the sheet laminate was evaluated in 5 grades according to the following criteria. Here, the aggregate means one aggregate, and the number of 1 aggregates is counted in the case where several aggregates appear to be 1 in visual observation. The results are shown in Table 2. Furthermore, 1 to 4 were set as pass.
1: no aggregates were observed on the surface of the sheet laminate (the number of aggregates was 0).
2: very few aggregates (1 to 3 aggregates in number) were observed on the surface of the sheet-like laminate.
3: few aggregates (4 to 10 aggregates) were observed on the surface of the sheet-like laminate.
4: aggregates (11 to 20 aggregates in number) were observed on the surface of the sheet-like laminate.
5: very many aggregates (the number of aggregates is 21 or more) were observed on the surface of the sheet-like layered body.
[ Table 2]
As can be seen from table 2, the sheet-like layered bodies of examples 1 to 10 and 17 to 20 exhibited high image brightness in both the reflection mode and the transmission mode, and were thus useful as projection screens for projectors. Further, it is understood that the sheet-like layered bodies of examples 1 to 10 and 17 to 20 can obtain high image quality in both the reflection mode and the transmission mode. Further, it is understood that the sheet-like laminates of examples 17 to 20 can suppress aggregates of light scatterer particles, and that the sheet-like laminates have excellent appearance and can obtain high image quality even when images are projected.
(example 11: curved surface type transparent Screen)
The substrate surface of each of the sheet laminates obtained in examples 1 to 10 was coated with an adhesive (trade name "ゲルポリ") to impart a slight adhesiveness. A curved transparent screen was produced by attaching a sheet-like laminate to a semicircular cylinder (thickness: 5mm, diameter: 500mm, angle: 45 DEG, and length: 400mm) made of a transparent acrylic resin so that no air bubbles were present at the interface. The curved transparent screen can be used as a transmission type transparent screen or a reflection type transparent screen.
Example 12 light diffusion sheet
The sheet laminate 6 was evaluated for its performance using an evaluation apparatus shown in fig. 4. The evaluation device shown in fig. 4 includes: a light source 10, a transparent optical table 11 disposed perpendicularly to a light emission optical axis of the light source 10, and an optical goniometer 12 having a photodetector 13. The sheet laminate 6 is fixed to a transparent optical table 11 on the substrate 4 side, and light is irradiated from a light source 10 from the light scattering body 5 side of the sheet laminate 6, and the intensity of the light transmitted through the sheet laminate 6 is detected by a photodetector 13, whereby measurement is performed. The results are shown in FIG. 5.
Specifically, the performance of the sheet laminate was evaluated as a light diffusion sheet using a simple LED illumination tester using a white LED (Xeon 3Emitter, maximum power consumption 3.2W, maximum applied voltage 5V, maximum forward current 800mA, color temperature 6,500K, manufactured by OptoSupply). The sheet laminate of example 2 was fixed on a transparent stage disposed perpendicular to the light emission optical axis of the LED light source on the substrate side, and irradiated with light. The light intensity distribution of the light scattered by the sheet laminate was measured by a photodetector (PIN フォトファイオード S1223 manufactured by yohimoto Photonics, aperture 1mm) provided in an optical goniometer (manufactured by NIKKA electric measurement corporation), and a signal from which noise was removed was detected by applying a 1,000Hz sine wave to the light source and using a lock-in amplifier (LI 5640 manufactured by NF loop ブロック) for an output signal of the photodetector to remove the stray light.
Comparative example 3 light diffusion sheet
An evaluation as a light diffusion sheet was made on a transparent polyester film (manufactured by Toyobo Co., Ltd., thickness 75 μm) in the same manner as in example 12. The results are shown in FIG. 5.
Comparative example 4 light diffusion sheet
Scotchcal (スコッチカル) light diffusion film (manufactured by 3M company, thickness 75 μ M) was evaluated as a light diffusion sheet in the same manner as in example 12. The results are shown in FIG. 5.
As shown in fig. 5, it is understood that when 2 times the measurement angle at which the intensity becomes 50% (0.5) is taken as the scattering angle, the scattering angle is about 12 ° in comparative example 3, and about 27 ° in comparative example 4, whereas the scattering angle is 73 ° in the sheet laminate of example 12.
Example 13 composite light diffusion sheet
As shown in fig. 6, a composite light diffuser sheet 15 in which a light scattering body 5 was formed on a commercially available light diffuser sheet 14 was prepared.
Specifically, a light-scattering material-forming composition 2 was applied to one surface of a light diffusion sheet (Scotchcal light diffusion film, manufactured by 3M). A composite light diffusion sheet was produced in the same manner as in example 1, except that the thickness of the light scattering layer was changed to 2.3 μm by coating. The composite light diffusion sheet can improve the light scattering rate.
Example 14 composite light diffusion sheet
A composite light diffusion sheet was produced in the same manner as in example 13, except that the thickness of the light scattering layer was set to 5.4 μm.
Example 15 composite light diffusion sheet
A composite light diffusion sheet was produced in the same manner as in example 13, except that the thickness of the light scattering layer was set to 8.3 μm.
Comparative example 5
A sample in which no light scattering layer was formed on the Scotchcal light diffusion film (manufactured by 3M) used in example 13 was evaluated as a composite light diffusion sheet.
This was used as a comparative example.
The coated surface was irradiated with LED illumination, and the optical properties of the composite light diffusion sheets of examples 13 to 15 and comparative example 5 were evaluated. The results are shown in Table 3.
[ Table 3]
The light diffusivity can be calculated by one of the measurement methods specified in german industrial standard DIN5036, specifically, by measuring the luminance L (θ) in the direction of the emission angle θ (± 5 °, ± 20 °, ± 70 °) of the light emitted from the opposite surface by making the light incident on one surface of the resin substrate at an incident angle of 0 degree, and substituting the measured value into the following formula (1), the diffusivity of the resin substrate can be calculated, and a higher value means a wider diffusion of the light.
Light diffusivity (D ═ D ═<(B70+B20)/2>/B5×100…(1)
Bθ＝Iθ/cosθ
IθMeasurement of the Strength at Angle θ
As is apparent from Table 3, the light diffusion rates of the composite light diffusion sheets of examples 13 to 15 were improved.
Example 16 intensifier for illumination
The sheet laminate 6 as a light intensifier was evaluated using the illumination device 23 shown in fig. 7. The illumination device 23 includes: a box-shaped white acrylic resin plate 20, a transparent acrylic resin plate 21 covering the opening thereof, and a cylindrical LED light source 22 provided inside of them. The sheet laminate 6 was attached to the entire inner surface of the white acrylic resin plate, and the case where the sheet laminate was not attached was compared, thereby performing evaluation.
Specifically, the sheet laminate of example 2 was attached to the entire inner surface (made of a white acrylic resin plate) of an illumination device having a vertical length of 20cm, a horizontal length of 40cm and a depth of 20cm by an adhesive. A straight-tube LED (manufactured by ルートアール, RL-BAR30DLC) was used as a light source, and the opening was closed with a transparent acrylic resin plate. The illuminance was measured at a position 30cm from the projection surface of the illumination device using an illuminometer (FT 3424, manufactured by sun-mounted electric machine) for the case where the sheet laminate was attached and the case where the sheet laminate was not attached. The results are shown in Table 4.
[ Table 4]
| Illuminance of light | |
| Illumination device having sheet-like laminate attached to inner surface thereof | 3532lux |
| Illumination device without sheet laminate attached to inner surface | 2194lux |
| Rate of rise of illuminance | 1.61 times of |
As is clear from table 4, the effect of increasing the illuminance by about 1.61 times was obtained when the sheet laminate of example 2 was used as a light intensifier for illumination.
Description of the reference numerals
1 … hollow particles; 2 … light scattering particles; 3 … resin medium; 4 … a substrate; 5 … light scatterers; 6 … a sheet laminate; 10 … light source; 11 … transparent optical bench; 12 … optical goniometer; 13 … light detector; 14 … light diffusion sheet; 15 … composite light diffusion sheet; 20 … white acrylic resin plate; 21 … transparent acrylic resin plate; 22 … cylindrical LED light source.
Claims (8)
1. A light scattering body is formed by dispersing hollow particles and light scattering particles in a resin medium having a refractive index lower than that of the light scattering particles.
2. The light scatterer of claim 1, wherein said light scattering particles are diamond.
3. The light scatterer according to claim 1 or 2, wherein the hollow particle has a pore diameter of 0.78 μm or more and 300 μm or less.
4. A composition for forming a light scattering body, comprising a hollow particle precursor, a light scattering particle, and a resin, wherein the refractive index of the light scattering particle is higher than the refractive index of the resin.
5. A sheet-like laminate comprising a substrate and a light-scattering layer comprising the light-scattering body according to any one of claims 1 to 3 provided on the substrate.
6. A projection screen comprising the light scattering body according to any one of claims 1 to 3 or the sheet laminate according to claim 5.
7. A light diffusing sheet comprising a light scattering layer comprising the light scatterer according to any one of claims 1 to 3.
8. An illumination device with a built-in light booster, comprising: a light intensifier comprising the light scattering body according to any one of claims 1 to 3 or the sheet laminate according to claim 5; and a light source.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-056156 | 2018-03-23 | ||
| JP2018056156 | 2018-03-23 | ||
| PCT/JP2019/006859 WO2019181368A1 (en) | 2018-03-23 | 2019-02-22 | Light-scattering body, composition for forming light-scattering body, sheet-like laminate, projection screen, light-diffusing sheet and lighting device with built-in light enhancer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111868576A true CN111868576A (en) | 2020-10-30 |
Family
ID=67986491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980020540.7A Pending CN111868576A (en) | 2018-03-23 | 2019-02-22 | Light scattering body, composition for forming light scattering body, sheet-like laminate, projection screen, light diffusion sheet, and illumination device incorporating light intensifier |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP7061184B2 (en) |
| CN (1) | CN111868576A (en) |
| TW (1) | TW201940902A (en) |
| WO (1) | WO2019181368A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2023165052A (en) * | 2020-10-05 | 2023-11-15 | シャープ株式会社 | Wavelength conversion element and light emitting system |
| WO2023085240A1 (en) * | 2021-11-09 | 2023-05-19 | リンテック株式会社 | Hard coat film for project screen and project screen |
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|---|---|---|---|---|
| JP2005173546A (en) * | 2003-11-18 | 2005-06-30 | Toray Ind Inc | Light reflective film and surface light source using the same |
| JP2006023342A (en) * | 2004-07-06 | 2006-01-26 | Seiko Instruments Inc | Screen for projection and image projection system using the same |
| JP2006330149A (en) * | 2005-05-24 | 2006-12-07 | Toppan Printing Co Ltd | Sheet for optical sheet, optical sheet, and backlight unit |
| JP2010505145A (en) * | 2006-09-29 | 2010-02-18 | イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー | Diffuse reflector including nonwoven sheet |
| WO2017007023A1 (en) * | 2015-07-09 | 2017-01-12 | セントラル硝子株式会社 | Transparent screen having light-scattering film, and coating liquid for forming light-scattering film |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140313579A1 (en) | 2011-12-20 | 2014-10-23 | 3M Innovative Properties Company | High contrast projection screen |
| US10584850B2 (en) * | 2012-06-05 | 2020-03-10 | Arkema France | Optical reflection films |
| WO2017094581A1 (en) * | 2015-12-01 | 2017-06-08 | 旭硝子株式会社 | Transparent screen sheet, transparent screen, and video display system |
-
2019
- 2019-02-22 CN CN201980020540.7A patent/CN111868576A/en active Pending
- 2019-02-22 WO PCT/JP2019/006859 patent/WO2019181368A1/en active Application Filing
- 2019-02-22 JP JP2020507458A patent/JP7061184B2/en active Active
- 2019-03-13 TW TW108108405A patent/TW201940902A/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005173546A (en) * | 2003-11-18 | 2005-06-30 | Toray Ind Inc | Light reflective film and surface light source using the same |
| JP2006023342A (en) * | 2004-07-06 | 2006-01-26 | Seiko Instruments Inc | Screen for projection and image projection system using the same |
| JP2006330149A (en) * | 2005-05-24 | 2006-12-07 | Toppan Printing Co Ltd | Sheet for optical sheet, optical sheet, and backlight unit |
| JP2010505145A (en) * | 2006-09-29 | 2010-02-18 | イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー | Diffuse reflector including nonwoven sheet |
| WO2017007023A1 (en) * | 2015-07-09 | 2017-01-12 | セントラル硝子株式会社 | Transparent screen having light-scattering film, and coating liquid for forming light-scattering film |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019181368A1 (en) | 2019-09-26 |
| JP7061184B2 (en) | 2022-04-27 |
| TW201940902A (en) | 2019-10-16 |
| JPWO2019181368A1 (en) | 2021-01-14 |
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