CN112055823A - Light diffusion molded body, film for transparent screen, and method for evaluating light diffusion molded body - Google Patents
Light diffusion molded body, film for transparent screen, and method for evaluating light diffusion molded body Download PDFInfo
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- CN112055823A CN112055823A CN201980026971.4A CN201980026971A CN112055823A CN 112055823 A CN112055823 A CN 112055823A CN 201980026971 A CN201980026971 A CN 201980026971A CN 112055823 A CN112055823 A CN 112055823A
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- 229920002554 vinyl polymer Polymers 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 235000019168 vitamin K Nutrition 0.000 description 1
- 239000011712 vitamin K Substances 0.000 description 1
- 150000003721 vitamin K derivatives Chemical class 0.000 description 1
- 229940046010 vitamin k Drugs 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
- C08L101/12—Compositions of unspecified macromolecular compounds characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
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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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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Optics & Photonics (AREA)
- Optical Elements Other Than Lenses (AREA)
- Overhead Projectors And Projection Screens (AREA)
Abstract
The invention provides a light diffusion formed body with excellent viewing angle characteristics and color reproducibility. The above object can be achieved by a light diffusion molded article comprising a transparent resin binder and light diffusion particles, wherein when incident light is irradiated to an intersection of a perpendicular line and a planar sample along an incident axis inclined at 5 DEG with respect to the perpendicular line perpendicular to the planar sample of the light diffusion molded article disposed at a reference position, in the relative reflected light intensity distribution of the reflected light reflected along the reflected light plane, the value of the inclination angle as the angle between the reference optical axis of the regular reflected light and the optical axis of the reflected light having a relative reflected light intensity of 50% of the intensity of the regular reflected light is 18 DEG or more, the reflected light plane is a plane formed by inclining a perpendicular plane including a perpendicular line and perpendicular to the plane sample, and also perpendicular to a plane including the perpendicular line and the incident axis, by 5 ° to the opposite side of the incident axis, and the regular reflected light is reflected light advancing along an intersection line of the plane including the perpendicular line and the incident axis and the reflected light plane.
Description
Technical Field
The present invention relates to a light-diffusing molded article, for example, a light-diffusing molded article for a transparent screen suitable for projection and display of an image, a film for a transparent screen, and a method for evaluating a light-diffusing molded article.
Background
Conventionally, a transparent screen for displaying an image such as an advertisement of a commodity is known (for example, patent documents 1 and 2). As such a transparent screen, a thin resin layer to which fine particles are added is used, and an image projected from a projector is displayed on the transparent screen.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 5752834
Patent document 2: WO2016/093181 publication
Disclosure of Invention
Technical problem to be solved by the invention
In a light-diffusing molded body including a transparent screen or the like, performance such as transparency is required to be at a practical level.
However, there are a large number of conventional light-diffusing molded articles that cannot be said to have sufficient performance. For example, when a light diffusion molded product is used as a transparent screen on which a moving image or a still image is projected, the visibility of the projected image may not be good.
For example, when a light-diffusing molded article in which reflected light or transmitted light is not sufficiently diffused is used for a transparent panel, there is a problem that a viewing angle becomes narrow, and it is difficult to visually recognize an image on the transparent panel from a position away from the front surface of the transparent panel.
In addition, in some cases, a video projected on a transparent screen based on certain specific video data has a lower color reproducibility such as a specific color, for example, a blue color, than a video displayed on another display device based on the same video data. For example, in the film for a transparent screen disclosed in patent document 1 described above, the blue color of an image projected from a projector is emphasized more than necessary. This is presumably because, since the light diffusion particles have a small particle size, the light reduction efficiency of blue light, which is short-wavelength light, is high, and light is further diffused.
Technical solution for solving technical problem
The present inventors have conducted extensive studies to solve the above-mentioned problems, and as a result, have found that a light-diffusing molded article, a film for a transparent panel, and the like, which are particularly excellent in viewing angle characteristics and color reproducibility and particularly suitable for applications of a transparent panel, can be realized, and have completed the present invention.
That is, a light-diffusing molded body and a film for a transparent panel that can achieve the above-described excellent characteristics are realized.
The present invention relates to a light-diffusing molded article and a resin composition for a transparent panel, which are described below.
In the present specification, the film also includes, for example, a sheet having a thickness of 1mm or more.
(1) A light-diffusing molded body comprising a transparent resin binder and light-diffusing particles,
the planar sample of the light diffusion molded body is arranged at a reference position,
in a relative reflected light intensity distribution of reflected light reflected along a reflected light plane when incident light is irradiated to an intersection of the perpendicular line and the plane sample along an incident axis inclined by 5 degrees with respect to the perpendicular line perpendicular to the plane sample arranged at the reference position,
an inclination angle of an angle between a reference optical axis of regular reflection light reflected along the incident axis and a reflection light having a relative reflection light intensity of 50% of the intensity of the regular reflection light and traveling along an intersection of a plane including the perpendicular line and the incident axis and the reflection light plane is 18 DEG or more,
wherein the reflection light plane is a plane formed by inclining a perpendicular plane including the perpendicular line and perpendicular to the plane sample, and also perpendicular to a plane including the perpendicular line and the incident axis, by 5 ° to the opposite side to the incident axis.
(2) The light diffusing molded article according to the above (1), wherein when incident light is incident on the planar sample arranged at the reference position at an angle of 45 ° with respect to the perpendicular line, values of a and b expressed by CIE1976 color system, which are calculated by a method according to JIS-Z-8781-4 based on a spectral spectrum of diffused reflection light reflected and diffused in a direction opposite to an optical axis of the incident light with the perpendicular line interposed therebetween, satisfy the following conditions (i) and (ii).
(i) a is-5 to 5.
(ii) b is-10 to 10.
(3) The light-diffusing molded article according to the above (2), wherein a value of chroma C represented by the CIE1976 color system calculated by the method according to JIS-Z-8781-4 from the spectral spectrum of the diffused reflection light further satisfies the following condition (iii).
(iii) C is-10 to 10.
(4) The light diffusing molded body according to any one of the above (1) to (3), wherein an inclination angle of an optical axis of the reflected light having a relative reflected light intensity of 10% of an intensity of the normally reflected light with respect to the reference optical axis is 70 ° or more.
(5) The light diffusing molded body according to any one of the above (1) to (4), wherein an inclination angle of an optical axis of the reflected light having a relative reflected light intensity of 50% of an intensity of the normally reflected light with respect to the reference optical axis is 18 ° or more and 70 ° or less.
(6) The light diffusing molded body according to any one of the above (1) to (5), wherein the light diffusing particles contain at least one of an oxide and a composite oxide of at least 1 element selected from Bi, Nd, Si, Al, Zr, and Ti, and a mixture of at least one of the oxide and the composite oxide.
(7) The light diffusing molded body according to the above (6), wherein the light diffusing particles include an oxide of at least Bi, a composite oxide, and a mixture of at least any one of the oxide and the composite oxide.
(8) The light-diffusing molded body according to any one of the above (1) to (7), wherein the light-diffusing particles have a Z-average particle diameter of 100 to 3000 nm.
(9) The light-diffusing molded body according to any one of (1) to (8) above, wherein the number-average particle diameter of the light-diffusing particles contained in the light-diffusing molded body is 100 to 2000 nm.
(10) The light-diffusing molded body according to any one of (1) to (9), wherein 15% or more of the light-diffusing particles contained in the light-diffusing molded body have a particle diameter in the range of 300 to 2000nm, based on the number of the light-diffusing particles.
(11) The light-diffusing molded body according to any one of (1) to (10) above, wherein the light-diffusing particles are contained in an amount of 0.001 to 3 parts by mass per 100 parts by mass of the transparent resin binder.
(12) The light-diffusing molded body according to any one of (1) to (11) above, wherein the light-diffusing particles have a polydispersity index of 0.8 or less.
(13) The light diffusing molded body according to any one of (1) to (12) above, wherein the transparent resin binder contains a thermoplastic resin.
(14) The light-diffusing molded body according to the above (13), wherein the thermoplastic resin contains a polycarbonate resin.
(15) A film for a transparent screen, comprising the light-diffusing molded body according to any one of the above (1) to (14).
ADVANTAGEOUS EFFECTS OF INVENTION
In the light diffusing molded body and the film for a transparent panel of the present invention containing the transparent resin binder and the light diffusing particles, the reflected light advancing in a direction deviating from the incident direction of the incident light also has an intensity of a certain degree or more. Therefore, the light-diffusing molded article and the film for a transparent panel of the present invention are particularly excellent in viewing angle characteristics and have high color reproducibility.
Drawings
Fig. 1 is a front view showing an example of a measuring apparatus for measuring the distribution of reflected light from a light-diffusing molded product.
Fig. 2 is a plan view showing an example of a measuring apparatus for measuring the distribution of reflected light from the light-diffusing molded article.
FIG. 3 is a view illustrating a case where incident light is irradiated on a reflection surface of a planar sample 20 as a light ray along a horizontal optical axis L1A graph of regular reflected light of reflected light advancing (reference optical axis) and reflected light advancing (diffused) away from the reference optical axis by a predetermined angle α.
Fig. 4 is a diagram schematically showing a method of measuring the intensity of diffuse reflected light generated when incident light is made incident at an angle of 45 ° with respect to the perpendicular to a plane sample.
Fig. 5 is a view schematically showing a method of measuring a particle diameter in a cross-sectional view of a resin film.
Fig. 6 is a graph showing the spectral spectra (relative reflected light intensities) of the light beams of the reflected light from the light-diffusing molded articles in examples and comparative examples.
Detailed Description
The present invention is described in detail below. The present invention is not limited to the following embodiments, and can be implemented by being arbitrarily modified within the scope of the effects of the present invention.
[ photodiffusion molded article ]
The light diffusion molded body of the present invention contains a transparent resin binder and light diffusion particles. The light diffusion molded article is particularly suitable for use as a light diffusion film such as a film for a transparent panel because it can diffuse the reflected light of incident light in a wide range and has a high viewing angle characteristic. That is, even when the reflected light generated by the light incident on the light diffusion molded body advances in a direction away from the optical axis of the incident light, the reflected light has a certain degree or more of intensity. Therefore, it can be said that the light-diffusing molded article and the film for a transparent panel of the present invention are particularly excellent in viewing angle characteristics and have high color reproducibility.
The light diffusing molded article preferably contains 0.001 to 3 parts by mass of the light diffusing particles (about 0.001 to about 3.0% by mass of the light diffusing molded article) per 100 parts by mass of the transparent resin binder. The light-diffusing molded article preferably contains 0.01 to 1 part by mass of light-diffusing particles per 100 parts by mass of the transparent resin binder, more preferably 0.03 to 0.5 part by mass of light-diffusing particles per 100 parts by mass of the transparent resin binder, and particularly preferably 0.1 to 0.3 part by mass of light-diffusing particles per 100 parts by mass of the transparent resin binder.
By adjusting the content of the light-diffusing particles to the above range, high transparency of the light-diffusing molded article can be ensured, a sufficient scattering effect of the reflected light of the projected light can be obtained, and visibility of an image such as color reproducibility is also improved.
< transparent resin adhesive >
As a main constituent material of the light diffusion molded body, a transparent resin binder is used. In order to improve the strength and durability of the film for a transparent screen, the transparent resin binder preferably contains a hard thermoplastic resin. In addition, in order to improve the transparency of the film for a transparent panel, it is preferable to contain a thermoplastic resin having high transparency.
Specifically, the thermoplastic resin used as a component of the transparent resin binder preferably contains at least 1 selected from the group consisting of polycarbonate resins, polyester resins, acrylic and methacrylic resins, polyolefin resins, cellulose-based resins, vinyl-based resins, and polystyrene-based resins.
Among the above options of the thermoplastic resin, the transparent resin binder particularly preferably contains at least 1 selected from the group consisting of polycarbonate resins and polyester resins.
For example, the polycarbonate resin is not particularly limited as long as it contains a [ O-R-OCO ] -unit containing a carbonate bond in the main molecular chain (R contains an aliphatic group, an aromatic group, or both an aliphatic group and an aromatic group and has a linear structure or a branched structure). Among these, from the viewpoint of impact resistance and heat resistance, and from the viewpoint of stability as an aromatic dihydroxy compound and further the ease of obtaining a resin containing a small amount of impurities contained therein, a more preferable polycarbonate resin is an aromatic polycarbonate. Examples of the aromatic polycarbonate include aromatic polycarbonates having a bisphenol a skeleton.
Specific types of the polycarbonate resin are not limited, and examples thereof include polycarbonate polymers obtained by reacting a dihydroxy compound and a carbonate precursor. In this case, a polyhydroxy compound or the like may be reacted in addition to the dihydroxy compound and the carbonate precursor. In addition, a method of reacting a cyclic ether with carbon dioxide as a carbonate precursor may be used. The polycarbonate polymer may be a homopolymer having 1 repeating unit or a copolymer having 2 or more repeating units. In this case, the copolymer can be selected from various copolymerization modes such as a random copolymer and a block copolymer.
The method for producing the polycarbonate resin is not particularly limited, and any method can be employed. Examples thereof include a surface polymerization method, a melt transesterification method, a pyridine method, a ring-opening polymerization method of a cyclic carbonate compound, a solid-phase transesterification method of a prepolymer, and the like.
The molecular weight of the polycarbonate resin is preferably 10,000 to 35,000, more preferably 10,500 or more, even more preferably 11,000 or more, further preferably 11,500 or more, and further preferably 12,000 or more, in terms of a viscosity average molecular weight calculated from a solution viscosity measured at a temperature of 25 ℃ using methylene chloride as a solvent. The viscosity average molecular weight of the polycarbonate resin is preferably 32,000 or less, more preferably 29,000 or less. The mechanical strength of the resin molded article of the present invention can be further improved by setting the viscosity average molecular weight to be not less than the lower limit of the above range, and the flowability of the resin can be improved while suppressing the decrease in the flowability thereof by setting the viscosity average molecular weight to be not more than the upper limit of the above range, and the thin-wall molding can be easily performed by improving the moldability.
In addition, 2 or more kinds of polycarbonate resins having different viscosity average molecular weights may be mixed and used, and in this case, a polycarbonate resin having a viscosity average molecular weight outside the above-mentioned preferable range may be mixed.
Further, viscosity average molecular weight [ Mv ]]The intrinsic viscosity [ eta ] at 25 ℃ was determined using methylene chloride as a solvent and an Ubbelohde viscometer](dl/g unit), viscosity formula from Schnell, i.e. eta ═ 1.23X 10－4Mv0.83The calculated value. In addition, the intrinsic viscosity [ eta ]]Means that the concentration [ C ] of each solution is measured]Specific viscosity [ eta ] in (g/dl)sp]And a value calculated by the following formula.
Further, as the polyester resin, for example, PETG (polyethylene terephthalate glycol-modified with cyclohexanedimethanol) or the like is used.
The transparent resin binder may contain a photocurable resin, a thermosetting resin, or the like as a component other than the thermoplastic resin. In this case, the transparent resin binder preferably contains 80 mass% or more of the thermoplastic resin, and more preferably 90 mass% or more of the thermoplastic resin.
The photocurable resin contained in the transparent resin adhesive may be any of an ultraviolet-curable resin and an electron beam-curable resin, and examples thereof include acrylic resins, silicone resins, and ester resins. Specific examples of the ultraviolet-curable resin include ultraviolet-curable resins having an acryloyl group in the molecule, for example, oligomers and polymers of epoxy acrylate, urethane acrylate, polyester acrylate and polyol acrylate, and mixtures of monomers, oligomers and polymers of monofunctional 2-functional or polyfunctional polymerizable (meth) acrylic monomers, for example, tetrahydrofuran acrylate, 2-hydroxyethyl acrylate, 2-hydroxy-3-phenoxypropyl acrylate, polyethylene glycol diacrylate, polypropylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol tetraacrylate, and the like. The photocurable resin may contain a photopolymerization initiator and the like which are generally used.
Examples of the thermosetting resin contained in the transparent resin adhesive include phenol resin, polyimide resin, bismaleimide triazine resin, crosslinkable Polyphenylene ether (polyphenyleneoxide), curable Polyphenylene ether (polyphenyleneether), melamine resin, urea resin, epoxy resin, unsaturated polyester resin, alkyd resin, diallyl phthalate resin, xylene resin, (meth) acrylic resin, cresol novolac epoxy resin, phenol novolac epoxy resin, biphenyl epoxy resin, linear aliphatic epoxy resin, alicyclic epoxy resin, heterocyclic epoxy resin, halogenated epoxy resin, spiro epoxy resin, various varnish epoxy resins synthesized from bisphenol a, resorcinol, etc., bisphenol a epoxy resin, and brominated bisphenol a epoxy resin.
< light diffusing particles >
The light diffusion molded body contains micronized light diffusion particles. As the light diffusion particles, for example, light diffusion particles containing a metal oxide or the like can be used. More specifically, the light diffusing particles preferably contain, for example, any one or more of an oxide and a composite oxide of at least 1 element selected from Bi, Nd, Si, Al, Zr, and Ti, and a mixture of at least any one of the oxide and the composite oxide. The light-diffusing particles more preferably contain at least 1 kind selected from the group consisting of bismuth oxide, zirconium oxide, silicon dioxide, titanium dioxide (titanium oxide), and aluminum oxide. The light-diffusing particles particularly preferably contain bismuth oxide, that is, oxides containing bismuth, composite oxides, and mixtures of at least one of the oxides and the composite oxides. The screen film containing these light diffusion particles, particularly the light diffusion particles listed as a preferable option, can particularly improve the color reproducibility of an image when projected by a projector.
As the light-diffusing particles of the metal oxide used in the present invention, light-diffusing particles subjected to surface treatment can be used. The surface treatment agent is preferably an inorganic material and/or an organic material. Specific examples of the surface treatment agent include metal oxides such as alumina, silica, and zirconia, silane coupling agents, titanium coupling agents, organic acids, polyols, and organic materials such as silicone.
The light diffusing particles preferably have a Z average particle diameter of 100nm to 3000 nm. The Z-average particle diameter of the light diffusing particles is more preferably 140nm to 2500nm, and still more preferably 200nm to 1500 nm. As described above, the light-diffusing molded body using the light-diffusing particles having a larger diameter can realize a transparent screen excellent in light diffusion of reflected light and color reproducibility as described in detail later, as compared with the light-diffusing particles used in the conventional transparent screen for projection, for example, the light-diffusing particles having a particle diameter of about several tens of nm.
The "Z-average particle diameter" as used herein refers to data obtained by analyzing measurement data of a particle dispersion or the like by a dynamic light scattering method using an cumulant analysis method.
In the cumulant analysis, an average value of particle diameters, which is defined as a Z-average particle diameter in the present invention, and a polydispersity index (PDi) are obtained.
Specifically, the following is described. First, a polynomial is fitted to the logarithm of the G1 correlation function obtained by measurement, and this operation is referred to as cumulative analysis, and the constant b in the following equation is referred to as second-order cumulative quantity or Z-average diffusion coefficient.
LN(G1)＝a+bt+ct2+dt3+et4+………
The value of the constant b is converted into a value of the particle diameter using the viscosity of the dispersion medium and some apparatus constants, and is defined as the Z average particle diameter. The value of the Z average particle diameter is the most important and stable value obtained by the dynamic light scattering method, and is a value suitable for the purpose of quality control as an index of dispersion stability. In addition, regarding the coefficient c of the 2-degree term, 2c/b2The value of (d) is called the polydispersity index (PDi).
Specifically, the Z average particle diameter as an index of dispersibility in the present invention can be measured by the following method.
That is, the value of the Z-average particle diameter can be obtained by putting light-diffusing particles into pure water, dispersing the particles using ultrasonic waves, and measuring the obtained solution using a particle diameter measuring machine utilizing dynamic light scattering, such as a Zetasizer Nano ZS measuring device manufactured by Malvern corporation.
The polydispersity index of the light diffusing particles is preferably 0.8 or less. Further, the polydispersity index of the light diffusing particles is more preferably 0.7 or less, and particularly preferably 0.5 or less. By using the light-diffusing particles having a small value of the polydispersity index in this way, the light-diffusing particles having an extremely large diameter or an extremely small diameter can be removed from the light-diffusing molded body.
[ other Components contained in the photodiffusion molded article ]
The light-diffusing molded article may contain, for example, the following additives as components other than the transparent resin binder and the light-diffusing particles. For example, the light diffusing molded article used as a film for a transparent panel contains at least 1 additive selected from a heat stabilizer, an antioxidant, a flame retardant aid, an ultraviolet absorber, a mold release agent, and a colorant. Antistatic agents, fluorescent whitening agents, antifogging agents, flow improvers, plasticizers, dispersants, antibacterial agents, and the like may be added as long as the desired physical properties are not significantly impaired.
The light diffusing molded article of the present invention preferably contains an antioxidant.
The antioxidant includes a phenolic antioxidant, an amine antioxidant, a phosphorus antioxidant, a thioether antioxidant, and the like, and is preferably a phosphorus antioxidant or a phenolic antioxidant (more preferably a hindered phenol antioxidant). Among these, the phosphorus-based antioxidant is particularly preferable because it can form a resin molded product having excellent hue. Among the phosphorus-based antioxidants, phosphite-based stabilizers are preferred, and phosphite compounds represented by the following formula (1) or (2) are preferred as the phosphite-based stabilizers.
(in the formula (1), R1And R2Each independently represents an alkyl group having 1 to 30 carbon atoms or an aryl group having 6 to 30 carbon atoms. )
(in the formula (2), R3～R7Each independently represents a hydrogen atom, an aryl group having 6 to 20 carbon atoms or an alkyl group having 1 to 20 carbon atoms. )
In the above formula (1), R1、R2The alkyl groups are independent, and preferably C1-10 linear or branched alkyl groups. R1、R2When at least any one of (1) and (1) is an aryl group, the aryl group is preferably an aryl group represented by any one of the following general formulae (1-a), (1-b), and (1-c).
(in the formula (1-a), RAEach independently represents an alkyl group having 1 to 10 carbon atoms. In the formula (1-b), RBEach independently represents an alkyl group having 1 to 10 carbon atoms. )
The content of the antioxidant in the photodiffusion molded product is preferably 0.005 to 1.0 mass%, more preferably 0.01 to 0.5 mass%, and still more preferably 0.02 to 0.3 mass%, based on the total mass of the photodiffusion molded product.
In the light diffusing molded article, the transparent resin binder and the light diffusing particles are contained in a total amount of preferably 60 mass% or more, more preferably 80 mass% or more, and particularly preferably 90 mass% or more, based on the total mass of the light diffusing molded article.
[ production of light-diffusing molded article ]
The light diffusing molded article is produced by blending the transparent resin binder and a material substance such as light diffusing particles. For example, each component such as a transparent resin binder is mixed using a tumbler, and further melt-kneaded using an extruder to produce a resin composition in the form of pellets as a material of the transparent resin binder. The form of the resin composition is not limited to pellet form, and may be flake, powder, block, or the like.
Further, a light-diffusing molded article can be obtained by molding the resin composition into a predetermined shape. For example, a light-diffusing molded product as a film for a transparent panel can be produced by a step of processing the resin composition into a film shape.
[ film for transparent Screen ]
The film for a transparent panel of the present invention comprises the above-mentioned light-diffusing molded article. More specifically, the film for a transparent panel of the present invention is formed mainly by the light diffusion molded body, and preferably only by the light diffusion molded body.
Thus, for example, the thickness of the light-diffusing molded article used as a film for a transparent panel is preferably 10 to 3000 μm (0.001 to 3mm), more preferably 30 to 2000 μm, and particularly preferably 50 to 1000 μm.
As is apparent from the fact that the film for a transparent panel contains the above-mentioned light-diffusing molded body, the film for a transparent panel also contains a transparent resin binder and light-diffusing particles.
The light-diffusing particles contained in the film for a transparent panel preferably have a Z-average particle diameter of 100nm to 3000nm, more preferably 140nm to 2500nm, and still more preferably 200nm to 1500 nm.
In order to confirm the value of the Z-average particle diameter of the light diffusion particles, the solvent for dissolving the transparent screen film is not particularly limited as long as the transparent screen film can be dissolved, and a solvent having high solubility of the resin forming the film is preferable, and specific examples thereof include dichloromethane, toluene, xylene, tetrahydrofuran, 1, 4-dioxane, dimethylformamide, N-methylpyrrolidone, ethyl acetate, cyclohexanone, acetone, methyl ethyl ketone, methanol, cyclohexane, and the like. Among these, dichloromethane (CH) is preferred2Cl2)。
In order to more accurately grasp the actual distribution of the light diffusion particles in the transparent screen film as the light diffusion molded article, it is preferable to measure the particle size of the light diffusion particles dispersed in the transparent screen film by observing the cross section of the transparent screen film, and calculate the average particle size, for example.
That is, the particle size of the light diffusing particles contained in the transparent screen film is measured from the film image by a method described in detail later, and the value of the number average particle size is calculated from the obtained particle size data.
The number average of the particle diameters of the light diffusion particles contained in the light diffusion molded product calculated as described above is preferably 100 to 2000nm, more preferably 150 to 1800nm, and still more preferably 200 to 1500 nm.
In addition, the light diffusion particles having a particle diameter in the range of 300 to 2000nm preferably account for 15% or more, more preferably 20% or more, still more preferably 40% or more, and particularly preferably 60% or more of the total number of the light diffusion particles in terms of the particle diameter distribution of the light diffusion particles in the film for a transparent panel.
Further, as described in the above-mentioned column of < light-diffusing particles > regarding the composition of the light-diffusing particles in the film for a transparent panel, for example, any one or more of an oxide, a composite oxide, and a mixture of at least one of the oxide and the composite oxide containing at least 1 element selected from Bi, Nd, Si, Al, Zr, and Ti is preferable. The light-diffusing particles in the film for a transparent screen more preferably contain at least 1 selected from the group consisting of bismuth oxide, zirconium oxide, silica, titanium dioxide (titanium oxide), and alumina, and particularly preferably contain an oxide, a complex oxide, and a mixture of at least any one of the oxide and the complex oxide of bismuth.
When the light diffusing particles are used, the color reproducibility can be maintained well while the viewing angle of the transparent screen is kept wide. That is, in the conventional transparent screen, the particle diameter of the light diffusing particles is generally reduced to increase the degree of diffusion and widen the viewing angle, but in this case, there is a problem of color reproducibility such that the blue color tone of the image to be viewed becomes excessive. On the other hand, when the light-diffusing particles of the above-described kind are used, the viewing angle can be widened and good color reproducibility can be achieved.
The composition of the light diffusion particles in the film for a transparent panel can be confirmed by energy dispersive X-ray (EDX) analysis, for example.
The content of the light diffusing particles in the film for a transparent panel is also the same as the content of the light diffusing molded article. That is, the film for a transparent panel preferably contains 0.001 to 3 parts by mass (about 0.001 to about 3.0% by mass) of the light diffusing particles per 100 parts by mass of the transparent resin binder, more preferably contains 0.01 to 1 part by mass of the light diffusing particles per 100 parts by mass of the transparent resin binder, still more preferably contains 0.03 to 0.5 part by mass of the light diffusing particles per 100 parts by mass of the transparent resin binder, and particularly preferably contains 0.1 to 0.3 part by mass of the light diffusing particles per 100 parts by mass of the transparent resin binder.
For example, in a light-diffusing molded product as a film for a transparent panel, the value of the total light transmittance is preferably 70% or more, more preferably 75% or more, and particularly preferably 80% or more. Thus, the film for a transparent panel having a high value of total light transmittance can clearly reflect an image projected from a projector. The total light transmittance in the present specification is a value obtained in accordance with JIS-K-7361 and JIS-K-7136, which will be described later.
For example, in a light-diffusing molded product as a film for a transparent panel, the haze value is preferably 80% or less, more preferably 75% or less, even more preferably 72% or less, particularly preferably 45% or less, for example 20% or less. Such a transparent screen film having a sufficiently low haze value has high transparency, is excellent in appearance, and can display a good image. The haze value in the present specification is a value obtained according to JIS-K-7361 and JIS-K-7136 described later.
For example, in a light diffusion molded body as a film for a transparent panel, as described in detail below, in the intensity distribution of reflected light measured when incident light is irradiated, light that is diffusely reflected and travels in a direction deviating from the optical axis of reflected light having a reflection angle equal to the incident angle of the incident light also has an intensity of a certain degree or more. As described above, since the intensity of the light that is diffused, reflected and advanced is not significantly reduced as compared with the intensity of the reflected light having a reflection angle equal to the incident angle, in the film for a transparent panel formed by the light diffusion molded body of the present invention, the effect of diffusing the reflected light of the light incident (projected) on the surface of the film can be obtained as described below, and the visibility of the image becomes good.
First, a planar sample of a light diffusing molded body is placed at a predetermined reference position, and incident light is irradiated to an intersection of a perpendicular line and the planar sample along an incident axis inclined by 5 ° with respect to the perpendicular line, not from the direction of the perpendicular line perpendicular to the planar sample placed at the reference position, and the relative reflected light intensity distribution of the reflected light is measured. For example, in fig. 1, the light source unit 10 is arranged along the optical axis L with respect to the horizontal direction1Incident light axis L inclined by 10 DEG2Incident light is irradiated. The flat specimen 20 on the specimen stage is arranged with respect to the horizontal optical axis L1Since the flat sample is fixed at the reference position while being tilted by 5 °, the incident light is irradiated to the reflection surface of the flat sample at the reference position from a direction inclined by 5 °.
Thus, the reflected light having a reflection angle equal to the incident angle, i.e. here having a reflection angle of 5 °, is along the horizontal optical axis L1The intensity is measured by the light receiving unit 30 while the light travels forward. In fig. 1, the light receiving unit 30 is not at the light receiving position, but moves to the light receiving position when measuring the reflected light. However, the light receiving unit 30 can measure not only the reflection angle equal to the incident angle as described above but also the horizontal optical axis L1The intensity of the advancing reflected light can also be measured so as to deviate from the horizontal optical axis L1The intensity of the reflected light that is reflected and advances is diffused.
That is, the light receiving unit 30 can move in the circumferential direction around the center of the planar sample 20 set at the reference position as the center point, and can measure the deviation from the horizontal optical axis L as illustrated by the arrow a in fig. 21The intensity of light advancing along the optical axis.
Using the measuring apparatus as described above, in the present embodiment, the measurement is performed along a perpendicular line (for example, the horizontal optical axis L in fig. 1) perpendicular to the surface of the planar sample at the reference position1And the incident light axis L2The central line of (b) an incident axis inclined by 5 ° (e.g., the incident optical axis L in fig. 1)2) Incident light is irradiated to the intersection point of the perpendicular line and the plane sample,the measurement is along the optical axis L including the perpendicular line and being parallel to the horizontal axis in the example of FIG. 11And the incident light axis L2Is aligned with the incident axis (e.g., the incident optical axis L)2) A reflection light plane (for example, a plane inclined at 5 degrees to the horizontal optical axis L in FIG. 1)1Uniform plane) of the light beam is advanced, and the relative reflected light intensity distribution of the reflected light is reflected (diffuse reflection).
Here, the plane including the perpendicular line is aligned with the horizontal optical axis L in the example of fig. 11And the incident light axis L2The plane corresponding to the middle line of (a) is also perpendicular to the surface of the planar sample at the reference position, and is also perpendicular to a plane (a plane parallel to the paper surface in fig. 1) including the perpendicular line and the incident axis.
In the relative reflected light intensity distribution thus measured, it is also possible to measure the intensity distribution along the incident optical axis L in fig. 12The optical axis of reflected light generated by reflection of incident light incident on the incident axis as illustrated at a reflection angle of 5 ° equal to the incident angle (for example, in fig. 1, the horizontal optical axis L1: reference optical axis of regular reflection light) forms a predetermined angle in the horizontal direction. For example, as illustrated in fig. 3, when incident light is irradiated to a point on the reflection surface of the planar sample 20, that is, to an intersection point P with the perpendicular line, the measurement is taken as being along the horizontal optical axis L1The intensity of the regular reflected light of the reflected light traveling (reference optical axis) and the intensity of the reflected light traveling (diffused) away from the reference optical axis by a predetermined angle α. And, measuring the horizontal optical axis L1The coincident reference optical axis and the optical axis L of the reflected light advancing in the direction away from the reference optical axis3The angle of (c) is taken as the tilt angle.
As described above, according to the present embodiment, as the relative reflected light intensity distribution data, the intensity of the regular reflected light proceeding along the reference optical axis, the inclination angle α (°) formed between the reference optical axis and the optical axis of the reflected light proceeding in the direction different from the direction other than the regular reflected light, and the intensity of the reflected light proceeding in the direction different from the direction other than the regular reflected light, in particular, the relative reflected light intensity with respect to the intensity of the regular reflected light can be measured.
The value of the inclination angle, which is the angle between the reference optical axis of the regular reflection light and the optical axis of the reflection light having a relative reflection light intensity of 50% of the intensity of the regular reflection light, is preferably 18 ° or more. The value of the tilt angle thus defined is more preferably 20 ° or more, still more preferably 24 ° or more, and particularly preferably 28 ° or more.
Further, the value of the inclination angle between the reference optical axis of the regular reflection light and the optical axis of the reflection light having a relative reflection light intensity of 50% of the intensity of the regular reflection light is, for example, 70 ° or less.
The value of the inclination angle of the optical axis of the reflected light with respect to the reference optical axis, which has a relative reflected light intensity of 10% of the intensity of the normally reflected light, is preferably 70 ° or more. The value of the tilt angle thus defined is more preferably 72 ° or more, still more preferably 74 ° or more, and particularly preferably 76 ° or more.
As described above, when the light diffusion molded body satisfying the condition between the inclination angle of the optical axis of the reflected light having a relative reflected light intensity of 50% of the intensity of the normally reflected light and the inclination angle of the optical axis of the reflected light having a relative reflected light intensity of 10% of the intensity of the normally reflected light is used as the transparent screen, the viewing angle, particularly the viewing angle of the reflected light when light for displaying an image is incident can be widened.
Further, as described above, when the incident light is made incident from a direction inclined with respect to the perpendicular line to the light receiving surface, instead of being made incident perpendicularly to the light receiving surface of the planar sample, the optical axis of the incident light and the reflected light plane including the observation point of the reflected light become inclined. Therefore, the intensity of the reflected light can be suppressed to a certain level, and the value and intensity ratio of the relative intensity of the reflected light can be easily measured. That is, by inclining the optical axis of the incident light by about 5 ° with respect to the perpendicular line perpendicular to the planar sample, the relative intensity of the reflected light can be accurately measured.
Further, as illustrated in fig. 1, it was confirmed that the distance between the optical axis of the incident light and the optical axis of the reflected light is sufficiently increased, and thus a space for disposing the light receiving device can be easily secured.
Further, the intensity of the incident light, the thickness of the planar sample, and the distance from the intersection to the observation point do not change the respective values of the relative intensity of the reflected light, and thus can be set appropriately.
The spectral spectrum of diffuse reflection light that is reflected and diffused in a direction opposite to the optical axis of incident light with a perpendicular line therebetween when the incident light is incident at an angle of 45 ° with respect to the perpendicular line of a plane sample of a light-diffusing molded body is measured in a state where the plane sample is arranged at a predetermined reference position. That is, as illustrated in fig. 4, the intensity of the diffused reflection light Lb generated at the time is measured while the light receiving unit 30 is rotated at 1 ° around the incident point on the planar sample 20 with the incident light La from the light source 10 disposed above the planar sample 20 being incident at an angle of 45 ° with respect to the perpendicular to the planar sample 20.
From the measurement results, the values of a and b of the light-diffusing molded article represented by the CIE1976 color system, which are calculated by the method according to JIS-Z-8781-4, preferably satisfy the following conditions (i) and (ii). That is, it is preferable
(i) a is from-5 to 5, and
(ii) b is-10 to 10.
The value of ajo is more preferably from-3 to 3, still more preferably from-1 to 1.
The b is more preferably from-7 to 7, still more preferably from-5 to 5.
When the light-diffusing molded article satisfying the above conditions (i) and (ii) is used for a transparent panel, the balance of the color tone of the image to be visually recognized is good, and high color reproducibility can be achieved. That is, although there is a possibility that the color reproducibility is lowered when the diffusibility of reflected light is increased, the values of b and a of the light-diffusing molded articles satisfying the conditions (i) and (ii) are both close to 0, and it can be said that the color balance of reflected light is good.
In addition, in the light diffusing molded article, it is preferable that the value of chroma C represented by CIE1976 color system calculated by the method according to JIS-Z-8781-4 from the spectral spectrum of the diffused reflection light measured under the above-mentioned conditions further satisfy the following condition (iii). That is, more preferably
(iii) C is-10 to 10.
The value of C is more preferably from-7 to 7, still more preferably from-5 to 5.
In the light-diffusing molded article, the value of hue h [ omega ] expressed by the CIE1976 color system calculated by the method according to JIS-Z-8781-4 based on the spectral spectrum of diffused reflection light measured under the above-mentioned conditions is preferably 200 to 350, more preferably 250 to 300, and still more preferably 260 to 275.
For example, in a light-diffusing molded product as a film for a transparent panel, when the degrees of diffusion of light irradiated with light having wavelengths of 400nm, 500nm, 600nm and 700nm are B (400), B (500), B (600) and B (700), respectively, the relative standard deviations (hereinafter also simply referred to as relative standard deviations) of B (400), B (500), B (600) and B (700) are preferably in the range of 0 to 20%. More preferably, the relative standard deviation values of B (400), B (500), B (600) and B (700) are 18% or less, and particularly preferably 15% or less.
In this way, when light of different wavelengths is incident (irradiated), the difference in the value of the diffusibility corresponding to the wavelength region is sufficiently small, and the balance of the colors in the projected image is improved, thereby improving the color reproducibility.
Further, the YI value (Δ YI value according to JIS Z8722) of the film for a transparent panel is preferably 5 or less. The YI value (Δ YI value) of the film for a transparent panel is more preferably 4.2 or less, and particularly preferably 3.0 or less.
Thus, the film for a transparent panel having a small YI value (Δ YI value) can suppress a change in color, particularly a change to yellow, due to decomposition of a resin of the material or the like. Therefore, in the film for a transparent panel having a small YI value (Δ YI value), the color reproducibility can be further improved.
The film for a transparent screen of the present invention is suitably used for the manufacture of a transparent screen. Further, the "transparent" described in the present specification means: the transparent display panel has transparency that enables the image to be projected on the screen with a high degree of visibility through the display panel. The transparent panel produced using the film for a transparent panel of the present invention has not only a wide viewing angle and excellent color reproducibility but also high transparency and high visible light transmittance.
In the transparent panel, a layer other than the film for a transparent panel of the present invention may be laminated. For example, a support layer for supporting the film for a transparent panel, a protective layer for protecting the surface of the film for a transparent panel, an adhesive layer for bonding the film for a transparent panel to another layer, and the like may be stacked.
The adhesive layer of the transparent panel is, for example, a layer for attaching a film on the transparent panel, and the adhesive layer is preferably formed using an adhesive composition. As the pressure-sensitive adhesive composition, for example, natural rubber-based, synthetic rubber-based, acrylic resin-based, polyvinyl ether resin-based, polyurethane resin-based, silicone resin-based, and the like can be suitably used in order not to impair the optical characteristics, the transmission visibility, and the like of the film for a transparent panel. Specific examples of the synthetic rubber-based adhesive composition include styrene-butadiene rubber, acrylonitrile-butadiene rubber, polyisobutylene rubber, isobutylene-isoprene rubber, styrene-isoprene block copolymer, styrene-butadiene block copolymer, and styrene-ethylene-butylene block copolymer. Specific examples of the silicone resin-based adhesive composition include dimethylpolysiloxane. These components can be used alone 1 or a combination of 2 or more. Among these, the adhesive layer is preferably formed using a silicone adhesive, an acrylic adhesive, or the like.
The thickness of the transparent screen is, for example, 0.45mm to 2mm, more preferably 0.48mm to 1.5mm, and particularly preferably 0.5mm (500 μm) to 1.0 mm.
The shape of the film for a transparent panel of the present invention may be any of a flat surface and a curved surface, and may be processed two-dimensionally or three-dimensionally. The processing method is not particularly limited, and examples thereof include a hot working method, a punching working method, a cold-rolling bending working method, a drawing working method, and the like, more preferably a hot bending working method, a curving working method, a blow molding method, and the like, and particularly preferably a press molding method, a vacuum molding method, a press molding method, a natural setting method, and the like.
[ projection of image ]
For projection of an image, a transparent panel manufactured using the film for a transparent panel of the present invention can be used. In the image projection, the image may be projected from the back side of the transparent screen or from the front side. That is, the transparent panel may be a transmissive panel for observing transmitted light or a reflective panel for observing reflected light, and the film for a transparent panel of the present invention is particularly suitable for the use as a reflective panel since the viewing angle characteristics of reflected light are particularly good.
[ method for producing film for transparent Panel ]
The film for a transparent panel of the present invention is produced by using the light diffusing molded body as described above. For example, a predetermined amount of light diffusing particles is added to a light diffusing molded body and melt-kneaded. Next, pellets of the light diffusion formed body containing the light diffusion particles are obtained by strand cutting, for example. The pellet of the light-diffusing molded article thus obtained can be extrusion-molded by, for example, a film extruder to produce a film for a transparent panel.
Further, the shape of the film for a transparent panel is adjusted by appropriately selecting and using the above-described various processing methods. The film for a transparent screen, which has been properly shaped by such an operation, can be used for the manufacture of a transparent screen. More specific examples of the production method include the following methods.
Examples
The present invention will be described in more detail below with reference to examples. The present invention is explained below by way of examples.
The raw materials used in examples and comparative examples are as follows.
[ raw materials ]
Thermoplastic resin (A) (transparent resin adhesive)
(A1) An aromatic polycarbonate resin (Ilpilon S-3000F, viscosity average molecular weight: 22,000, manufactured by Mitsubishi engineering plastics corporation) (A2) obtained by an interfacial polymerization method using bisphenol A as a starting material was used to modify a polyethylene terephthalate resin (SKYGREEN S2008, manufactured by SK Chemicals, viscosity average molecular weight: 31,000)
Light diffusing particles (B)
(B1) Bismuth-based Metal oxide (bismuth oxide containing Neodymium oxide, 42-920A manufactured by Tokan Material Technology Co., Ltd.)
(B2) Particles obtained by pulverizing and classifying bismuth-based metal oxide (bismuth oxide containing neodymium oxide, 42-920A manufactured by Tokan Material Technology Co., Ltd.)
The processing was carried out using an air JET MILL (model: SUPER JET MILL SJ-500) manufactured by Nisshin works and an air Classifier (model: Aerofine AC-20) manufactured by Nisshin works, and the processed particles were obtained by pulverizing the particles using the air JET MILL and then removing coarse particles using the air Classifier. Further, the obtained particles were dispersed in pure water, and the particle size distribution was measured by a particle size distribution measuring apparatus (MT 3300EXII, manufactured by MICROTRAC BEL corporation) using a laser diffraction scattering method to obtain a volume-converted average particle diameter D50, whereby D50 of the B1 particles before processing was 0.94 μm and B2 particles after processing was 0.27 μm.
(B3) Particles of bismuth-based metal oxide (bismuth oxide containing neodymium oxide, 42-920A manufactured by Tokan Material Technology Co., Ltd.) were nanoparticulated by plasma processing
The processing was performed using a nanoparticle processing system manufactured by Nisshin works, and the nanoparticles were obtained by evaporating the particles and re-aggregating the particles by thermal plasma generated in a high-frequency magnetic field. Further, as a result of measuring the specific surface area of the obtained pellets using a BET specific surface area measuring apparatus (Macsorb HM model-1208, manufactured by Mountech corporation), the BET specific surface area of the B1 pellets before processing was 1.8m2Per g, processed B3 granules were 15.5m2/g。
(B4) Silica particles (silica, AdmaNano YA 050C-SP 3 manufactured by Admatechs corporation)
(B5) Silica particles (silica, AdmaFine SO-C1 manufactured by Admatechs corporation)
(B6) Silica particles (silica, AdmaFine SC-2500 SQ manufactured by Admatechs corporation)
(B7) Silica particles (silica, AdmaFine SC-C6 manufactured by Admatechs corporation)
(B8) Zirconium oxide particles (zirconium oxide, zirconium oxide methanol dispersion SZR-M made by Sakai chemical industry Co., Ltd. having a particle concentration of 30.5 wt%)
(B9) Zirconia particles (zirconia, UEP made by first Dilute elements chemical Co., Ltd.)
(B10) Zirconia particles (zirconia, SPZ of first rare element chemical Co., Ltd.)
(B11) Titanium dioxide particles (titanium oxide, TITANIX JR-405 manufactured by TAYCA K.K.)
(B12) Titanium dioxide particles (titanium oxide, TITANIX JR-301 manufactured by TAYCA K.K.)
Antioxidant (C)
Bis (2, 6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite (phosphorus antioxidant ADEKA, ADK STAB PEP-36)
Release agent (D) Glycerol monostearate (Rikemal S-100A, product of Rizha Vitamin K.K.)
[ measurement of Z-average particle diameter and polydispersity index (Pdi) of light-diffusing particles contained in resin composition ]
The Z-average particle diameter and the polydispersity index (Pdi) of the light diffusing particles (B) were obtained by cumulant analysis from the measurement results obtained using a Zetasizer Nano ZS measurement apparatus manufactured by Malvern using a dynamic light scattering method. The measurement was performed at room temperature, and a dispersion liquid obtained by dispersing the light-diffusing particles (B) in pure water at a concentration of 0.1 wt% was measured. In addition, ultrasonic waves are used for dispersing the light diffusion particles (B).
The polydispersity index (PDi) is an index that defines the particle size distribution of the particles, the narrower the particle size distribution, the closer to 0 the PDi, and conversely, the broader the particle size distribution, i.e., the greater the polydispersity, the greater the PDi. [ production of thermoplastic resin pellets to which light-diffusing particles are added ]
The light-diffusing particles (B), the antioxidant (C), and the other additive (D) were added to the thermoplastic resins (a1) and (a2) in amounts shown in table 2. Thereafter, the resin and the like were mixed for 20 minutes using a tumbler, and then melt-kneaded at a cylinder temperature of 280 ℃ by a vented twin-screw extruder (TEM 26SS, manufactured by toshiba mechanical corporation) having a screw diameter of 26mm, and cut into pellets by strand cutting.
[ production of thermoplastic resin film containing light-diffusing particles ]
The obtained pellets were melted and extruded by a twin screw film extruder (TEX-30. alpha. manufactured by Nippon Steel works, Ltd.) with a screw diameter of 30mm and a vent having a T die lip, to prepare a film-shaped molded article.
[ production example 1 of adhesive layer ]
The resin film of example 4 thus molded was coated with a thermosetting coating material using a metal bar coater, and then heated and dried in an oven, thereby obtaining an undercoat layer having a thickness of 1 μm. Then, a silicone-based adhesive coating was applied using a reverse gravure coating roll, and then heated and dried using an oven, thereby forming an adhesive layer having a thickness of 50 μm.
[ production example 2 of adhesive layer ]
On the release-treated surface of the PET film subjected to release treatment with a thickness of 25 μm, an acrylic adhesive was applied using a gravure roll or a bar coater, and then heated and dried using an oven, thereby forming an adhesive film with a thickness of 17 μm. The adhesive layer surface of the adhesive film was bonded to the resin film of example 4, and pressure was applied to transfer the adhesive layer to the resin film of example 4. The adhesive layer-attached resin films of production examples 1 and 2 having the adhesive layer formed in this way were laminated on a glass plate having a thickness of 5mm, and the films were observed visually to find that they were very transparent. Further, it was confirmed that the visibility of the projected image was sufficiently high by projecting an image on the adhesive layer-attached resin film using an ultra-short focus projector (product name: PJ WX4152, manufactured by Ricoh Co., Ltd.).
The particle diameters of the light diffusion particles contained in the resin films of the examples and comparative examples were measured by a method of observing the cross-sectional shape of the film (cross-sectional observation method).
[ measurement of particle diameter of light-diffusing particles in resin film by Cross-section Observation (Cross-section Observation method) ]
The resin film molded by the above method was subjected to a cross-sectional processing by ion milling for about 3 hours, and the obtained cross-section was observed by a field emission scanning electron microscope (FE-SEM). The apparatus used for the ion milling cross section processing was IM-4000 manufactured by Hitachi Kogyo, and the apparatus used for the cross section observation by FE-SEM was SU-8220 manufactured by Hitachi Kogyo. In the image observation mode for cross-sectional observation, the LA-BSE image was used to measure the particle size of the particles that can be observed when the magnification was 2000 times. At least 10 particles were observed for each film.
Based on the above observation data, the particle diameter d of each particle was calculated based on the formula (particle diameter in the longitudinal direction (a) + particle diameter in the short-side direction (b))/2 ═ d. As shown in fig. 5, the particle diameter (a) in the longitudinal direction and the particle diameter (b) in the short direction are the longest particle diameter among the diameters passing through the center points of the cross sections of the particles, and the particle diameter (b) is the shortest particle diameter among the diameters passing through the center points of the cross sections of the particles.
The average particle diameter of the plurality of particles is expressed as the number average particle diameter Dav and is calculated by the following equation.
Σ(nd)/Σ(n)＝Dav
In the formula, d represents the particle diameter of each particle, that is, each particle diameter, and n represents a percentage on the number basis. Further, the ratio of the number of particles having a particle diameter d in the range of 300 to 2000nm to the total number of particles which can be observed is determined.
Further, by performing energy dispersive X-ray (EDX) analysis, it was confirmed that the observed particles were light diffusion particles to be the object of calculation of the particle diameter. The device used in EDX is X-Max manufactured by horiba SeisakushoNAnd (4) dividing.
[ evaluation of optical Properties of film ]
The optical properties of the molded articles produced in the above examples and comparative examples were evaluated as follows.
First, the total light transmittance (%) and haze (%) of the molded article were measured in accordance with JIS-K-7361 and JIS-K-7136 using a haze meter (trade name: HM-150, manufactured by color technology research on village, Ltd.).
Next, the writability of the molded article was measured by using a writability measuring machine (model name: ICM-1T manufactured by SUGATEST corporation) for the transmitted light of the molded article in accordance with JIS K7374, and the value of the image clarity (%) when measured with an optical comb width of 0.125mm was defined as the writability.
[ light diffusibility of film ]
Method for measuring diffusion degree D
The relative reflected light intensity distribution measured when a planar sample of the molded article was irradiated at 10 ° perpendicularly from the normal direction was measured under the following measurement conditions using a variable angle photometer (model No. GP-200) using a halogen lamp as a light source and an optical axis detouring apparatus manufactured by color research on mura, ltd. Before the measurement, a sensitivity test was performed in a light receiving range of-1 ° to 1 °, and when the peak intensity exceeded 100%, a light reduction filter was appropriately inserted so that the peak intensity became the maximum intensity not exceeding 100%. The characteristics of the darkening filter used are as follows.
[ Table 1]
| Light-reducing filter | Total light transmission |
| ND－50 | 49.50％ |
| ND－25 | 24.90％ |
| ND－10 | 9.50％ |
| ND－1 | 0.82％ |
Using the peak profile data of the reflected light intensity distribution, the emission angle (1/2 half width) of the intensity of 1/2 corresponding to the peak intensity of the peak, that is, the intensity of the specular reflection light, and the emission angle (1/10 half width) of the intensity of 1/10 corresponding to the peak intensity of the peak are calculated.
Measurement conditions: reflection
·High Volt Adj：－900
·Sensivity Adj：700
Beam aperture: 3.0
A light receiving aperture: 4.0
Angle of incidence: 0 degree
The tilt angle of the sample: 5 degree
Light reception start angle: -45 °
Light reception end angle: 90 degree
Measurement of the spacing: 0.1 degree interval
[ color tone of diffused light ]
Method for measuring a value of < a > and a value of < b >
The spectral distribution of the reflected light at each light-receiving angle measured when the molded article was irradiated with light at 45 degrees perpendicularly to the normal direction was measured under the following measurement conditions using a variable angle spectroscopic colorimetry system GCMS-4B (measuring machine model: GSP-2) using a halogen lamp as a light source manufactured by Colorado research, Ltd. Before measurement, the standard white board was irradiated with light at 45 ° from the normal direction, and the sensitivity of the light source was adjusted under the condition that the reflected light was received at 0 °. Based on the data of the spectral distribution of the reflected light beam which is diffused in the direction having an angle of 0 DEG with respect to the horizontal direction from the normal direction of the molded article, the respective values of a, b, C and h are calculated by the method according to JIS-Z-8781-4 in the CIE1976 color system.
Measurement conditions: reflection
Light source: standard light source D65
Visual field: 2 degree field of vision
Angle of incidence: 45 degree
The tilt angle of the sample: 0 degree
Light reception start angle: 0 degree
Light reception end angle: 80 degree
Measurement of the spacing: at 5 deg. intervals
Next, the transparency of the molded article was visually evaluated based on the following criteria.
[ evaluation criteria for transparency ]
Particularly good: the film was very transparent.
Good: the film was transparent.
Slightly poor: the film was slightly cloudy and poor in transparency.
Poor: the film was cloudy and poor in transparency.
[ production and evaluation of transparent Panel ]
The films produced in the above examples and comparative examples were provided as a transparent screen at a position 12cm away from the image projection lens of an ultra-short focus projector (product name: PJ WX4152, manufactured by Ricoh Co., Ltd.). Then, an image is projected from below 60 ° to the screen, and the focus knob of the projector is adjusted so as to be focused on the position of the screen. Regarding the luminance uniformity of the projector image, the visibility of the image when viewed from the front and the rear, the visibility of the image when viewed from an angle of 45 ° and the rear 1m, and the color tone of the image were visually evaluated based on the following criteria. The evaluation of the image visibility was performed in a dark room, and was performed by observing the screen reflection light which is the same surface as the projector.
The evaluation results are shown in tables 1 and 2 below.
[ evaluation criteria for uniformity of image luminance ]
Particularly good: the image of the screen is very uniformly bright from which direction.
Good: the image of the screen is uniformly bright from which direction.
Poor: the brightness is different and uneven according to the different angles of the images of the viewing screen.
[ evaluation criteria for color tone of image ]
Particularly good: the color reproducibility of the screen image is very high.
Good: the screen image has high color reproducibility.
Poor: the screen image has a strong bluing phenomenon and low color reproducibility.
[ Table 2]
[ Table 3]
Claims (15)
1. A light diffusing molded body characterized in that:
comprising a transparent resin binder and light-diffusing particles,
arranging the planar sample of the light diffusion molded body at a reference position,
when incident light is irradiated to an intersection of the perpendicular line and the plane sample along an incident axis inclined by 5 ° with respect to the perpendicular line perpendicular to the plane sample arranged at the reference position, a relative reflected light intensity distribution of reflected light reflected along a reflected light plane described below is obtained,
a value of an inclination angle as an angle between a reference optical axis of regular reflection light reflected along the incident axis and a reflected light having a relative reflected light intensity of 50% of an intensity of the regular reflection light and an optical axis of the reflected light advancing along an intersection line of a plane including the perpendicular line and the incident axis and the reflected light plane is 18 ° or more,
wherein the reflected light plane is a plane formed by inclining a perpendicular plane including the perpendicular line and perpendicular to the plane sample, and also perpendicular to a plane including the perpendicular line and the incident axis, by 5 ° to the opposite side to the incident axis.
2. The light diffusing molded body according to claim 1, wherein:
when incident light is incident on the flat sample arranged at the reference position at an angle of 45 DEG with respect to the perpendicular line, the values of ajo and ajo expressed by CIE1976 color system, which are calculated by a method according to JIS-Z-8781-4 based on the spectral spectrum of diffuse reflected light that is reflected and diffused in a direction opposite to the optical axis of the incident light with the perpendicular line therebetween, satisfy the following conditions (i) and (ii),
(i) a is-5 to 5,
(ii) b is-10 to 10.
3. The light diffusing molded body according to claim 2, wherein:
the value of chroma C [ X ] expressed by CIE1976 color system calculated by the method according to JIS-Z-8781-4 based on the spectral spectrum of the diffused reflection light further satisfies the following condition (iii),
(iii) c is-10 to 10.
4. The light diffusing molded body according to any one of claims 1 to 3, wherein:
the value of the inclination angle of the optical axis of the reflected light with respect to the reference optical axis is 70 ° or more, the inclination angle being a relative reflected light intensity of 10% of the intensity of the regular reflected light.
5. The light diffusing molded body according to any one of claims 1 to 4, wherein:
the value of the inclination angle of the optical axis of the reflected light with respect to the reference optical axis, which has a relative reflected light intensity of 50% of the intensity of the normally reflected light, is 18 ° or more and 70 ° or less.
6. The light diffusing molded body according to any one of claims 1 to 5, wherein:
the light diffusing particles contain any one or more of an oxide, a composite oxide, and a mixture of at least any one of the oxide and the composite oxide of at least 1 element selected from Bi, Nd, Si, Al, Zr, and Ti.
7. The light diffusing molded body according to claim 6, wherein:
the light diffusing particles contain at least an oxide of Bi, a composite oxide, and a mixture of at least any one of the oxide and the composite oxide.
8. The light diffusing molded body according to any one of claims 1 to 7, wherein:
the Z-average particle size of the light diffusion particles is 100-3000 nm.
9. The light diffusing molded body according to any one of claims 1 to 8, wherein:
the number average particle diameter of the light diffusion particles contained in the light diffusion molded body is 100 to 2000 nm.
10. The light diffusing molded body according to any one of claims 1 to 9, wherein:
the light diffusion particles have a particle diameter of 300 to 2000nm of 15% or more based on the number of the light diffusion particles contained in the light diffusion molded body.
11. The light diffusing molded body according to any one of claims 1 to 10, wherein: the light diffusion particles are contained in an amount of 0.001 to 3 parts by mass per 100 parts by mass of the transparent resin binder.
12. The light diffusing molded body according to any one of claims 1 to 11, wherein: the light-diffusing particles have a polydispersity index of 0.8 or less.
13. The light diffusing molded body according to any one of claims 1 to 12, wherein: the transparent resin binder includes a thermoplastic resin.
14. The light diffusing molded body according to claim 13, wherein:
the thermoplastic resin comprises a polycarbonate resin.
15. A film for a transparent screen, characterized in that:
comprising the light diffusing molded body according to any one of claims 1 to 14.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-086244 | 2018-04-27 | ||
| JP2018086244 | 2018-04-27 | ||
| PCT/JP2019/017943 WO2019208770A1 (en) | 2018-04-27 | 2019-04-26 | Light-diffusing molded body, film for transparent screen, and method for evaluating light-diffusing molded body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112055823A true CN112055823A (en) | 2020-12-08 |
| CN112055823B CN112055823B (en) | 2022-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980026971.4A Active CN112055823B (en) | 2018-04-27 | 2019-04-26 | Light-diffusing molded body, film for transparent screen, and method for evaluating light-diffusing molded body |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPWO2019208770A1 (en) |
| CN (1) | CN112055823B (en) |
| WO (1) | WO2019208770A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112876795A (en) * | 2021-01-20 | 2021-06-01 | 青岛易来智能科技股份有限公司 | Rayleigh scattering material master batch, preparation method thereof, light diffusion plate and lighting device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09306217A (en) * | 1996-05-10 | 1997-11-28 | Sumitomo Chem Co Ltd | Light diffusion plate for cool white fluorescent lamp cover |
| JP2016170907A (en) * | 2015-03-11 | 2016-09-23 | 日本ポリエステル株式会社 | Luminaire |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7887208B2 (en) * | 2005-09-15 | 2011-02-15 | Zeon Corporation | Direct type back-light device |
| WO2017010217A1 (en) * | 2015-07-15 | 2017-01-19 | Ｊｘエネルギー株式会社 | Dispersion liquid for forming transparent light-dispersing layer of transparent screen, transparent screen, and producing method for transparent screen |
| DE102016200875A1 (en) * | 2016-01-22 | 2017-07-27 | Mitsubishi Polyester Film Gmbh | Biaxially oriented, UV-stabilized, single or multi-layer polyester film with a combination of silicon dioxide particles as light scattering particles and a UV stabilizer as well as processes for their production and their use in greenhouse shade mats |
-
2019
- 2019-04-26 JP JP2020515604A patent/JPWO2019208770A1/en active Pending
- 2019-04-26 CN CN201980026971.4A patent/CN112055823B/en active Active
- 2019-04-26 WO PCT/JP2019/017943 patent/WO2019208770A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09306217A (en) * | 1996-05-10 | 1997-11-28 | Sumitomo Chem Co Ltd | Light diffusion plate for cool white fluorescent lamp cover |
| JP2016170907A (en) * | 2015-03-11 | 2016-09-23 | 日本ポリエステル株式会社 | Luminaire |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112876795A (en) * | 2021-01-20 | 2021-06-01 | 青岛易来智能科技股份有限公司 | Rayleigh scattering material master batch, preparation method thereof, light diffusion plate and lighting device |
| CN112876795B (en) * | 2021-01-20 | 2023-09-29 | 青岛易来智能科技股份有限公司 | Rayleigh scattering material master batch, preparation method thereof, light diffusion plate obtained by using Rayleigh scattering material master batch and lighting device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019208770A1 (en) | 2019-10-31 |
| JPWO2019208770A1 (en) | 2021-05-13 |
| CN112055823B (en) | 2022-08-26 |
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