CN110770651A

CN110770651A - Resin composition for transparent panel, film for transparent panel, and method for producing film for transparent panel

Info

Publication number: CN110770651A
Application number: CN201880040998.4A
Authority: CN
Inventors: 赤塚涉
Original assignee: Mitsubishi Gas Chemical Co Inc
Current assignee: Mitsubishi Gas Chemical Co Inc
Priority date: 2017-06-27
Filing date: 2018-04-27
Publication date: 2020-02-07
Anticipated expiration: 2038-04-27
Also published as: JPWO2019003626A1; JP7074135B2; WO2019003626A1; CN110770651B

Abstract

The invention provides a resin composition for a transparent screen, a film for a transparent screen and the like, which are particularly suitable for manufacturing a transparent screen which has excellent performances such as transparency, a viewing angle and the like, has good color reproducibility and has high image visibility. The above problems can be solved by a resin composition for a transparent panel, and the like: the resin composition for transparent screens comprises a thermoplastic resin (A) and inorganic particles (B), wherein (1) the inorganic particles (B) have a Z-average particle diameter of 400 to 7000nm, and (2) the inorganic particles (B) are contained in an amount of 0.001 to 3 parts by mass per 100 parts by mass of the thermoplastic resin (A).

Description

Resin composition for transparent panel, film for transparent panel, and method for producing film for transparent panel

Technical Field

The present invention relates to a transparent screen, and more particularly, to a resin composition for a transparent screen for projection display, a film for a transparent screen, and a method for producing the same.

Background

Conventionally, a transparent screen that displays an image used for, for example, a commercial advertisement or the like 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 the existing transparent screen, the performance such as transparency, view angle and the like needs to reach a practical level.

However, in some cases, the visibility of the projection image is not necessarily good in the transparent screen satisfying these performances. That is, in an image projected on a transparent screen based on certain specific image data, the following problem of color reproducibility sometimes occurs: a particular color, such as blue, is enhanced as compared to a map displayed on other display machines based on the same map data. For example, in the film for a transparent panel disclosed in patent document 1, there is a problem that blue color of an image projected from a projector is enhanced. This is because the light diffusion particles have a small particle size, and hence the extinction efficiency of the short-wavelength light, i.e., blue light, is high, and the light is further diffused.

Technical solution for solving technical problem

The present inventors have conducted extensive studies to solve the above problems, and as a result, have found that a resin composition for a transparent panel, a film for a transparent panel, and the like, which are particularly suitable for producing a transparent panel having excellent properties such as transparency and viewing angle, good color reproducibility, and high image visibility, can be realized, and have completed the present invention.

That is, by containing a predetermined amount of inorganic particles having a particle diameter within a predetermined range in a thermoplastic resin, a resin composition for a transparent panel and a film for a transparent panel that can achieve the above-described excellent characteristics are realized.

The present invention relates to a resin composition, a film for a transparent panel, and a method for producing a film for a transparent panel, which are described below.

(i) A resin composition for transparent screens comprising a thermoplastic resin (A) and inorganic particles (B),

(1) the inorganic particles (B) have a Z-average particle diameter of 400 to 7000nm,

(2) the inorganic particles (B) are contained in an amount of 0.001 to 3 parts by mass per 100 parts by mass of the thermoplastic resin (A).

(ii) The resin composition for a transparent panel according to the above (i), wherein the inorganic particles (B) are contained in an amount of 0.001 to 0.015 part by mass based on 100 parts by mass of the thermoplastic resin (A).

(iii) The resin composition for a transparent screen according to the above (i) or (ii), wherein the inorganic particles (B) have a polydispersity index of 0.8 or less.

(iv) The resin composition for a transparent panel according to any one of the above (i) to (iii), wherein the inorganic particles (B) contain at least one of an oxide and a composite oxide of at least 1 element selected from Bi, Nd, Si, Al and Zr, and a mixture of at least one of the oxide and the composite oxide.

(v) The resin composition for a transparent panel according to the above (iv), wherein the inorganic particles (B) contain at least one or more of an oxide and a composite oxide of Bi and a mixture of at least one of the oxide and the composite oxide.

(vi) The resin composition for a transparent panel according to any one of the above (i) to (v), wherein the inorganic particles (B) have a Z-average particle diameter of 600 to 3000 nm.

(vii) A film for transparent screens comprising the resin composition for transparent screens described in any one of (i) to (vi) above.

(viii) A film for transparent screens comprising a thermoplastic resin (A) and inorganic particles (B),

(ix) The film for a transparent panel as described in the above (vii) or (viii), wherein the inorganic particles (B) having a Z-average particle diameter of 400 to 7000nm in a state in which the film for a transparent panel is dissolved in a solvent.

(x) The film for a transparent panel as described in (ix), wherein the inorganic particles (B) have a Z-average particle diameter of 500 to 3700 nm.

(xi) The film for a transparent panel according to any one of the above (vii) to (x), wherein the inorganic particles (B) contain at least one or more of an oxide and a composite oxide of Bi, and a mixture of at least one of the oxide and the composite oxide.

(xii) The film for a transparent screen according to any one of the above (vii) to (xi), wherein the particle diameter of 30% or more of the number of particles of the inorganic particles (B) contained in the film for a transparent screen is in the range of 300 to 2000nm, based on the number of particles.

(xiii) The film for a transparent panel according to any one of the above (vii) to (xii), wherein the inorganic particles (B) contained in the film for a transparent panel have an average particle diameter of 300 to 3000 nm.

(xiv) The film for a transparent panel according to any one of the above (vii) to (xiii), wherein the thickness is 10 to 3000 μm.

(xv) The film for a transparent screen according to any one of the above (vii) to (xiv), wherein a total light transmittance measured by a method defined in JIS-K-7361 and JIS-K-7136 is 70% or more.

(xvi) The film for a transparent panel according to any one of the above (vii) to (xv), wherein the haze measured according to the method defined in JIS-K-7361 and JIS-K-7136 is 70% or less.

(xvii) The film for a transparent panel as described in any one of the above (vii) to (xvi), wherein the value of the diffusivity, B, defined by the following formula is in the range of 2 to 70.

(in the above formula (I), I_θThe emission intensity of the light ray emitted in the direction having an angle theta DEG with respect to the direction perpendicular to the film is received,

the above-mentioned emergent intensity light receiving I_θThe film was subjected to sensitivity adjustment in a state where the film was not placed so that the light receiving angle was 3 ° and the light emission intensity was 85%, and then the film was irradiated with light by transmission measurement under the following conditions. )

The optical filter: is free of

Beam aperture: 6.0

A light receiving aperture: 4.0

Angle of incidence: 0 degree

The sample inclination angle: 0 degree

Light reception start angle: -90 °

Light reception end angle: at 90 deg..

(xviii) The film for a transparent panel according to any one of the above (vii) to (xvii), wherein when the diffusivities of the irradiation light at wavelengths of 400nm, 500nm, 600nm and 700nm when the film is irradiated with light are represented as B (400), B (500), B (600) and B (700), respectively, the relative standard deviations of B (400), B (500), B (600) and B (700) are in the range of 0 to 20%.

(xix) The film for a transparent panel according to any one of the above (vii) to (xviii), wherein the YI value of the film for a transparent panel measured according to the geometric condition (f) of JIS Z8722 is 5 or less.

(xx) A method for producing a transparent panel, wherein the resin composition for a transparent panel described in any one of (i) to (vi) above is used.

ADVANTAGEOUS EFFECTS OF INVENTION

The resin composition and the film for a transparent screen of the present invention contain a predetermined amount of inorganic particles having a specific particle diameter in the thermoplastic resin layer as described above, and are particularly suitable for producing a transparent screen excellent in performance such as transparency and viewing angle and also excellent in visibility of images such as color reproducibility. Therefore, the transparent panel of the present invention has a feature of being excellent in image visibility particularly including color reproducibility.

Drawings

Fig. 1 is a graph showing the relationship between the light receiving angle and the transmitted light intensity of incident light having different wavelengths in the film for a transparent panel according to example 3.

Fig. 2 is a graph showing the relationship between the light receiving angle and the transmitted light intensity of incident light having different wavelengths in the film for a transparent panel of comparative example 10.

Fig. 3 is a view schematically showing a method of measuring a particle diameter in a cross-sectional view of a resin film.

Detailed Description

The present invention will be described in detail below. The present invention is not limited to the following embodiments, and can be implemented by being arbitrarily changed within the scope of the effect of the invention.

[ resin composition for transparent Panel ]

The resin composition for a transparent screen of the present invention has a thermoplastic resin (a) and a specific kind of inorganic particles (B) which will be described later in detail. The resin composition for transparent screens contains 0.001 to 3.0 parts by mass (about 0.001 to about 3.0 mass%) of the inorganic particles (B) per 100 parts by mass of the thermoplastic resin (A).

The inorganic particles (B) are contained in an amount of preferably 0.01 to 2.0 parts by mass, more preferably 0.05 to 1.0 part by mass, and particularly preferably 0.1 to 0.3 part by mass, based on 100 parts by mass of the thermoplastic resin (A). By adjusting the content of the inorganic particles (B) to the above range, it is possible to obtain a sufficient scattering effect of the projection light while securing high transparency of the sheet or film, and to improve visibility of an image such as color reproducibility.

In addition, as described above, the inorganic particles (B) contribute to the improvement of the performance of the transparent screen even in a small amount. Therefore, the inorganic particles (B) may be added in an amount of about 0.001 to 0.015 parts by mass, for example, less than 0.015 parts by mass (about less than 0.015 parts by mass in the resin composition) per 100 parts by mass of the thermoplastic resin (a).

< thermoplastic resin (A) >

As a main constituent material of the resin composition for a transparent panel, the thermoplastic resin (a) is used. In order to improve the strength and durability of the film for a transparent panel, it is preferable to use the hard thermoplastic resin (a). In addition, in order to improve the transparency of the film for a transparent panel, it is preferable to use the thermoplastic resin (a) having high transparency.

Specifically, the thermoplastic resin (a) preferably contains at least 1 selected from the group consisting of polycarbonate resins, polyester resins, acrylic and methacrylic resins, polyolefin resins, cellulose resins, vinyl resins, and polystyrene resins.

In particular, among the above options, the thermoplastic resin (a) 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 is a polycarbonate resin having a unit of- [ O-R-OCO ] - (R includes an aliphatic group, an aromatic group, or both of an aliphatic group and an aromatic group, and a group having a linear structure or a branched structure) containing a carbonate bond in the main chain of the molecule. Among these, an aromatic polycarbonate is more preferably used from the viewpoint of impact resistance and heat resistance, and from the viewpoint of stability as an aromatic dihydroxy compound and easiness of obtaining a substance containing a small amount of impurities therein. Examples of the aromatic polycarbonate include aromatic polycarbonates having a bisphenol a skeleton.

As the polyester resin, for example, PETG (polyethylene terephthalate glycol-modified with cyclohexane dimethanol) or the like can be used.

< inorganic particles (B) >)

The resin composition for transparent screens contains micronized inorganic particles (B). As the inorganic particles (B), for example, inorganic particles containing a metal oxide or the like are used. More specifically, the inorganic particles (B) preferably contain at least one of an oxide and a composite oxide of at least 1 element selected from Bi, Nd, Si, Al, and Zr, and a mixture of at least one of the oxide and the composite oxide. The inorganic particles (B) more preferably contain at least 1 selected from the group consisting of bismuth oxide, zirconium oxide, silica and alumina. As the inorganic particles (B), particularly preferred are inorganic particles containing bismuth oxide, that is, inorganic particles containing an oxide of bismuth, a composite oxide, and a mixture of at least any one of the oxide and the composite oxide.

The inorganic particles (B) have a Z-average particle diameter of 400 to 7000 nm. The inorganic particles (B) preferably have a Z-average particle diameter of 400 to 5000nm, more preferably 430 to 3800nm, still more preferably 500 to 3400nm, and particularly preferably 600 to 3000 nm. As described above, by using the resin composition for a transparent screen in which the inorganic particles (B) having a larger particle diameter than the inorganic particles used in the conventional transparent screen for projection, for example, inorganic particles having a particle diameter of about several tens nm, it is possible to realize a transparent screen having excellent light transmittance, light diffusibility and color reproducibility as will be described later in detail.

The Z-average particle diameter in the present invention refers to data obtained by analyzing measurement data of a dynamic light scattering method for a particle dispersion or the like by an accumulative analysis method.

In the cumulative analysis, an average value of particle diameters and a polydispersity index (PDi) can be obtained, and in the present invention, the average particle diameter is defined as a Z-average particle diameter.

Specifically, the following is described. First, the operation of fitting a logarithm of the G1 correlation function obtained by measurement to a polynomial is called cumulative analysis, and the constant b in the following equation is called quadratic accumulation or Z-average diffusion coefficient.

LN(G1)＝a+bt+ct²+dt³+et⁴+……

The value of the constant b is converted into a particle diameter value using the viscosity of the dispersion medium and several 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 c, 2c/b as a 2-order coefficient²The value of (d) is called the polydispersity index (PDi).

The Z average particle diameter as an index of dispersibility in the present invention can be measured specifically by the following method.

That is, the value of the Z average particle diameter can be obtained by putting inorganic particles into pure water, dispersing the particles using ultrasonic waves, and measuring the obtained solution with 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 inorganic particles (B) is preferably 0.8 or less. The polydispersity coefficient of the inorganic particles (B) is more preferably 0.7 or less, and particularly preferably 0.5 or less. By using the inorganic particles (B) having a small value of the polydispersity coefficient in this way, the inorganic particles having an excessively large particle diameter or an excessively small particle diameter can be removed in the film for a transparent screen.

[ other Components contained in the resin composition for transparent Panel ]

The resin composition for transparent panels may contain a resin different from the thermoplastic resin (a) as a component other than the thermoplastic resin (a) and the inorganic particles (B).

In addition, the resin composition for a transparent panel may contain the following additives other than the thermoplastic resin (a) and the inorganic particles (B). That is, the film for a transparent screen may contain 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, and the like. Antistatic agents, fluorescent whitening agents, antifogging agents, fluidity improving agents, plasticizers, dispersants, antibacterial agents, and the like may be added as long as desired various physical properties are not significantly impaired.

The resin composition for a transparent screen preferably contains the thermoplastic resin (a) and the inorganic particles (B) in an amount of 60 mass% or more, more preferably 80 mass% or more, and particularly preferably 90 mass% or more.

[ production of resin composition for transparent Panel ]

The resin composition for a transparent screen is produced by blending the above-mentioned material substances such as the thermoplastic resin (a) and the inorganic particles (B). For example, the respective components such as the thermoplastic resin (a) are mixed using a tumbler, and melt-kneaded using an extruder, whereby a pellet-shaped resin composition for a transparent panel can be produced. However, the form of the resin composition for a transparent panel is not limited to pellet form, and may be flake, powder, block, or the like.

[ film for transparent Screen ]

The film for a transparent panel of the present invention contains the above resin composition for a transparent panel.

The thickness of the film for transparent screens is preferably 10 to 3000. mu.m, more preferably 30 to 2000. mu.m, and particularly preferably 50 to 1000 μm (1.0 mm).

As described above, as is apparent from the fact that the film for a transparent panel contains the above resin composition for a transparent panel, the film for a transparent panel also contains the thermoplastic resin (a) and the inorganic particles (B).

The inorganic particles (B) contained in the film for a transparent panel have a Z-average particle diameter of 400 to 7000 nm. The inorganic particles (B) preferably have a Z-average particle diameter of 400 to 5000nm, more preferably 430 to 3800nm, still more preferably 500 to 3400nm, and particularly preferably 600 to 3000 nm.

The particle diameter of the inorganic particles (B) of the transparent panel film can be confirmed in a state where the transparent panel film is dissolved in a solvent. That is, the value of the Z-average particle diameter of the inorganic particles (B) of the transparent panel film measured in a state in which the transparent panel film is dissolved in a solvent is preferably 400nm to 7000nm, and more preferably 500nm to 3700 nm.

The solvent for dissolving the transparent screen film in order to confirm the value of the Z-average particle diameter of the inorganic particles (B) is not particularly limited as long as it can dissolve the transparent screen film, but is preferably a solvent having high solubility of the resin forming the film, and specific examples thereof include dichloromethane (CH), toluene, xylene, tetrahydrofuran, 1, 4-dioxane, dimethylformamide, N-methylpyrrolidone, ethyl acetate, cyclohexanone, acetone, methyl ethyl ketone, methanol, cyclohexane, and the like, and among these, dichloromethane (CH) is preferable₂Cl₂)。

In order to more accurately grasp the actual distribution of the inorganic particles (B) in the film for transparent screens produced using the resin composition for transparent screens, it is preferable to measure the particle diameter of the inorganic particles (B) in a state of being dispersed in the film for transparent screens by observing the cross section of the film for transparent screens, for example, to calculate the average particle diameter.

That is, the particle diameter of the inorganic particles (B) contained in the film for a transparent panel is measured from the film image by a method described in detail later, and the value of the number average particle diameter is calculated from the obtained particle diameter data.

The number average of the particle diameters of the inorganic particles (B) contained in the transparent screen film calculated as described above is preferably 300 to 3000nm, more preferably 400 to 2800nm, and still more preferably 500 to 2500 nm.

In addition, the particle size distribution of the inorganic particles (B) in the film for a transparent panel is preferably 30% or more, more preferably 35% or more, and further preferably 40% or more of the inorganic particles (B) having a number average particle size in the range of 300 to 2000nm, based on the total number of the inorganic particles (B).

As for the component of the inorganic particles (B) in the film for a transparent panel, as described in the above item < inorganic particles (B) > 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, and Zr is preferable. The inorganic particles (B) in the film for a transparent screen more preferably contain at least 1 selected from the group consisting of bismuth oxide, zirconium oxide, silica and alumina, and particularly preferably contain an oxide, a composite oxide, and a mixture of at least any one of the oxide and the composite oxide of bismuth. The composition of the inorganic particles (B) in the film for a transparent screen can be confirmed by energy dispersive X-ray (EDX) analysis, for example.

As described above, the content of the inorganic particles (B) in the transparent screen film is also about 0.001 to 3.0 parts by mass (about 0.001 to about 3.0% by mass), preferably about 0.01 to 2.0 parts by mass, more preferably about 0.05 to 1.0 part by mass, and particularly preferably about 0.1 to 0.3 part by mass, of the inorganic particles (B) based on 100 parts by mass of the thermoplastic resin (a). Among these, since the inorganic particles (B) contribute to the improvement of the performance of the transparent screen even in a small amount, the inorganic particles (B) may be added in an amount of about 0.001 to 0.015 parts by mass, for example, less than 0.015 parts by mass (less than about 0.015% by mass in the resin composition) per 100 parts by mass of the thermoplastic resin (a).

In the film for a transparent panel, the value of the total light transmittance is preferably 70% or more, more preferably 74% or more, and particularly preferably 80% or more. Thus, the film for a transparent panel having a high total light transmittance can clearly display 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.

In the transparent screen film, the haze value is preferably 70% or less, more preferably 50% or less, and still more preferably 40% or less. Thus, the film for transparent screens having a sufficiently low haze value has high transparency, is excellent in appearance, and can display images well. The haze value in the present specification is a value obtained according to JIS-K-7361 and JIS-K-7136, which will be described later.

In the film for a transparent screen, the value of the diffusivity, B, defined by the following formula (I) is preferably in the range of 2 to 70. The value of the diffusivity B is more preferably 5 to 65, and particularly preferably 10 to 60. In this way, in the transparent screen film having a large value of the diffusibility B, the reflected light of the light incident (projected) on the surface of the transparent screen film is diffused, and an effect is obtained, and the visibility of the image is improved.

The value of the diffusivity B is calculated as follows. First, the light intensity of the emitted light is measured by irradiating the film for transparent panel with light I_θ°. The thus obtained emission intensity light I_θ°Among the data of (1), use I_5°、I_20°And I_70°Value of (in the formula, each is represented as I)₅、I₂₀And I₇₀) The diffusivity B is calculated by the above formula (I).

In the above formula (I), I_θ°The emission intensity of a light ray emitted in a direction perpendicular to the transparent screen film at an angle θ ° is shown.

Further, regarding the emission intensity acceptance I in the formula (I)_θ°The specific measurement method of (3) is described in detail later.

In the film for a transparent panel, when the diffusivities of the irradiation light at wavelengths of 400nm, 500nm, 600nm and 700nm when the film is irradiated with light are represented as 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%. The relative standard deviation values of B (400), B (500), B (600) and B (700) are more preferably 18% or less, and particularly preferably 15% or less.

In this way, when light of different wavelengths is incident (irradiated), in the transparent screen film in which the difference in the value of the diffusibility corresponding to the wavelength region is sufficiently small, the balance of the respective colors in the projected image is good, and the color reproducibility is improved.

For example, referring to fig. 1, it can be seen that: in the film for a transparent panel of example 3 having a small value of the relative standard deviation, the relationship between the light receiving angle and the transmitted light intensity was substantially constant in any of the incident light of blue having a wavelength of 400nm, the incident light of green having a wavelength of 500nm, the incident light of red having a wavelength of 600nm, and the incident light of magenta having a wavelength of 700 nm. Therefore, in the film for a transparent panel of example 3, it can be said that behavior of intensity of a scattering angle with respect to scattered light generated by incident light does not change depending on the wavelength of the incident light and is substantially constant.

On the other hand, it is understood that in the film for a transparent panel of comparative example 10, which has a large value of the relative standard deviation and is not preferable from the viewpoint of color reproducibility, the relationship between the light receiving angle and the transmitted light intensity greatly differs when the wavelength of the incident light differs. Therefore, in the film for a transparent panel of comparative example 10, it can be said that behavior of intensity of a scattering angle with respect to scattered light generated by incident light is greatly different depending on the wavelength of the incident light.

The measurement methods of B (400), B (500), B (600), and B (700) will be described later.

In addition, using di according to the geometric condition (f) of JIS Z8722: the YI value (Δ YI value) of the film for a transparent panel measured by 0 ° post-spectroscopic method 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. The Δ YI value was measured using a spectral transmission colorimeter "SD-6000" manufactured by Nippon Denshoku industries Ltd. In this case, the difference from the YI value data measured with the sample placed is measured as the Δ YI value based on the YI value data measured without placing the sample.

In this way, in the film for a transparent panel having a small YI value (Δ YI value), color change due to decomposition of the material resin or the like, particularly, discoloration to yellow is suppressed. Therefore, in the film for a transparent panel having a small YI value (Δ YI value), the color reproducibility can be further improved.

In tables 1 and 2, the value obtained by calculation (the same calculation method as that according to JIS K7373) from the data obtained by the measurement according to the geometric condition (f) of JISZ8722 according to astm e313-05 is expressed as the Δ YI value.

[ transparent screen ]

The transparent panel of the present invention has the film for a transparent panel. The transparent screen is preferably high in transparency and visible light transmittance, and the term "transparent" as used in the description of the present invention means a transparent screen having transparency enough to allow an image to be projected on the screen to be viewed through the screen. Thus, the transparent screen of the present invention also includes a translucent screen.

In the transparent panel of the present invention, 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 transparent panel, a protective layer for protecting the surface of the film for transparent panel, an adhesive layer for bonding the film for transparent panel to another layer, and the like may be laminated.

The adhesive layer of the transparent panel is, for example, a layer for adhering a film such as a film for a transparent panel to the transparent panel, and is preferably formed using an adhesive composition. In order not to impair the optical properties, the transmission visibility, and the like of the film for a transparent panel, for example, natural rubber-based, synthetic rubber-based, acrylic resin-based, polyvinyl ether resin-based, polyurethane resin-based, silicone resin-based, and the like are preferably used as the adhesive composition. 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 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 and the transparent panel of the present invention may be any of a plane and a curved surface, or may be a shape obtained by two-dimensional processing or three-dimensional processing. The processing method is not particularly limited, and examples thereof include a hot working method, a punching working method, a cold bending working method, a drawing working method, and the like, more preferably a hot bending working method, a curved surface working method, a blow molding method, and the like, and particularly preferably a press molding method, a vacuum molding method, a press-air molding method, a natural-standing method, and the like.

[ projection of image ]

The transparent screen of the present invention described above can be used for projection of an image. In the image projection, the image can be projected from the back or the front of the transparent screen of the present invention. That is, the transparent panel of the present invention may be a transmissive panel for observing transmitted light or a reflective panel for observing reflected light.

[ film for transparent Panel and method for producing transparent Panel ]

The film for a transparent panel of the present invention is produced by the production method using the resin composition for a transparent panel. For example, as follows. First, a predetermined amount of inorganic particles (B) is added to thermoplastic resin (a) and melt-kneaded. Next, for example, pellets of the thermoplastic resin (a) containing the inorganic particles (B) are obtained by strand cutting. The pellet of the resin composition for a transparent panel obtained in this way can be subjected to extrusion molding using, for example, a film extruder, thereby producing a film for a transparent panel.

The shape of the film for transparent panel is adjusted by appropriately selecting the above-mentioned various processing methods. The transparent panel can be manufactured by using the transparent panel film whose shape is appropriately adjusted in this manner. More specific examples of the production method include the following methods.

Examples

The present invention will be described more specifically below with reference to examples. However, the present invention is not to be construed as being limited by the following examples.

The raw materials used in examples and comparative examples are as follows.

[ raw materials ]

Thermoplastic resin (A)

(A1) Aromatic polycarbonate resin starting from bisphenol A (Ilpilon S-3000F, viscosity average molecular weight: 22,000, manufactured by Mitsubishi engineering plastics chemical Co., Ltd.)

(A2) Modified polyethylene terephthalate resin (SKYGREEN S2008 manufactured by SK Chemicals viscosity average molecular weight: 31,000)

Inorganic particles (B)

(B1) Bismuth-based Metal oxide (bismuth oxide containing Neodymium oxide, 42-920A manufactured by Tokan Metal Technology Co., Ltd.)

(B2) Particles obtained by pulverizing and classifying bismuth-based metal oxide (bismuth oxide containing neodymium oxide, 42-920A manufactured by Tokan Metal 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 Classifier AC-20) manufactured by Nisshin works, and the processed particles were obtained by pulverizing the particles with the air Jet mill and removing coarse particles with the air Classifier. Further, when the obtained particles were dispersed in pure water, and a particle size distribution was measured using a particle size distribution measuring apparatus (MT 3300EXII manufactured by Microtrac Bel) by a laser diffraction scattering method to obtain a volume-converted average particle diameter D50, the value of D50 of the particles before processing (B1) was 0.94 μm, and the value of D50 of the particles after processing (B2) was 0.27 μm.

(B3) Silica particles (silica, ADMANANOYA 050C-SP 3 manufactured by Admatech corporation)

(B4) Silica particles (silica, ADMANANOYA 100C-SP 3 manufactured by Admatech 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-4500 SQ manufactured by Admatechs corporation)

(B8) Silica particles (silica, ADMAFINE SC-5500 SQ manufactured by Admatechs corporation)

(B9) Silica particles (silica, ADMAFINE SO-C6 manufactured by Admatechs corporation)

(B10) Alumina particles (alumina, α -alumina manufactured by Wako pure chemical industries, Ltd., 017-13005)

(B11) Zirconium dioxide particles (zirconium oxide, zirconium dioxide methanol dispersion SZR-M made by Sakai chemical industry Co., Ltd.)

(B12) Zirconium dioxide particles (zirconium oxide, Zirconeo manufactured by Itec Co., Ltd.)

(B13) Zirconium dioxide particles (zirconium oxide, UEP manufactured by first Dilute element chemical Co., Ltd.)

(B14) Zirconium dioxide particles (zirconium oxide, UEP-100 manufactured by first Dilute element chemical Co., Ltd.)

(B15) Zirconium dioxide particles (zirconium oxide, SPZ from first Dilute element chemical Co., Ltd.)

Antioxidant (C)

Bis (2, 6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite (phosphorus antioxidant, ADEKASTUB PEP-36 manufactured by ADEKA K.K.)

Release agent (D)

Glyceryl monostearate (RIKEMAL S-100A manufactured by Riken Vitamin Co., Ltd.)

[ measurement of Z-average particle diameter and polydispersity index (Pdi) of inorganic particles contained in resin composition ]

The Z-average particle diameter and the polydispersity coefficient (Pdi) of the inorganic particles (B) were obtained by cumulative analysis from 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 inorganic particles (B) in pure water at a concentration of 0.1 wt% was measured. Further, the dispersion of the inorganic particles (B) is performed using ultrasonic waves.

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 zero 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 inorganic particles are added ]

The inorganic particles (B), the antioxidant (C) and the release agent (D) were added to the thermoplastic resins (a1) and (a2) in amounts shown in table 1. Then, the resin and the like were mixed for 20 minutes by a tumbler, and then melt-kneaded at a cylinder temperature of 280 ℃ using a two-screw extruder (TEM 26SS manufactured by toshiba mechanical corporation) with a vent having a screw diameter of 26mm, and cut into pellets by strand cutting.

[ production of thermoplastic resin film containing inorganic particles ]

The obtained pellets were melted and extruded by a two-screw film extruder (TEX-30 α, manufactured by Nippon Steel works Co., Ltd.) with a vent having a screw diameter of 30mm and a T-die lip, and molded into a sheet or a film.

[ production example 1 of adhesive layer ]

The resin film described in example 2 thus molded was coated with a thermosetting coating material using a metal bar coater, and then heated and dried in an oven, thereby forming a base layer having a thickness of 1 μm. Then, a silicone adhesive coating was applied using a reverse gravure roll, and then heated and dried in an oven, thereby forming an adhesive layer having a thickness of 50 μm.

[ production example 2 of adhesive layer ]

An acrylic adhesive was applied to the release-treated surface of the PET film having a thickness of 25 μm after release treatment using a gravure roll or a bar coater, and then heated and dried in an oven, thereby forming an adhesive film having a thickness of 17 μm. The adhesive layer surface of the film was bonded to the resin film described in example 2 and pressed, whereby the adhesive layer was transferred to the resin film described in example 2, thereby forming an adhesive layer.

The particle diameter of the inorganic particles (B) contained in the resin film thus formed is measured by a method of dissolving the film in a solvent (dissolution method) or a method of observing the cross-sectional shape of the film (cross-sectional observation method).

[ measurement (dissolution method) of the Z-average particle diameter and the polydispersity index (Pdi) of the inorganic particles (B) in the resin film Using a solvent ]

First, the film is dissolved in a solvent, and the method for measuring the Z-average particle diameter and the polydispersity index (Pdi) is as follows. In a vial made of glass, CH was added₂Cl₂The solvent was adjusted so that the concentration of the thermoplastic resin (PC resin) contained in the resin film was 1%, by stirring up and down and rotating the resin film for 2 hours or more using a mix rotor (model: VMR-5R) manufactured by AS-1. The solvent containing the resin obtained in this way was measured using a Zetasizer Nano ZS measuring device manufactured by Malvern corporation using a dynamic light scattering method, and the Z-average particle and the polydispersity coefficient (Pdi) of the inorganic particles (B) in the solvent were determined by cumulative analysis. In addition, the measurement was performed at room temperature. The polydispersity index (PDi) is an index defining the particle size distribution of the particles, the narrower the particle size distribution, the closer to zero the PDi, and conversely, the broader the particle size distribution, i.e., the greater the polydispersity, the greater the PDi becomes

[ measurement of particle diameter of inorganic particles in resin film by Cross-section Observation (Cross-section Observation method) ]

The resin film molded by the above method was subjected to 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 device used in the ion milling section processing is IM-4000 manufactured by Hitachi high and new technology, and the device used in the section observation by using the FE-SEM is SU-8220 manufactured by Hitachi high and new technology. In the image observation mode for cross-sectional observation, the particle size of the particles that can be observed when the magnification is set to 2000 times was measured using the LA-BSE image. 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 following formula.

(particle diameter in the longitudinal direction (a) + particle diameter in the short-side direction (b))/2 ═ d

As shown in fig. 3, 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 value of the average particle diameter of the plurality of particles is calculated as the number average particle diameter Dav 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 the proportion (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 that can be observed is determined. Here, the total number of particles that can be observed means the number of particles (total particle number) that can be observed in a cross section obtained by enlarging an image in a predetermined range by 2000 times as described above.

Further, by performing energy dispersive X-ray (EDX) analysis, it was confirmed that the particles observed were inorganic particles that were the object of particle size calculation. The apparatus used in EDX is X-Max manufactured by horiba^NAnd (4) dividing.

[ evaluation of film for transparent Panel ]

The optical properties of the films produced in the above examples and comparative examples were evaluated as follows.

First, the total light transmittance (%), the parallel light transmittance (%) and the haze (%) of the film were measured according to 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 light diffusibility, color reproducibility, and image-writability of the film were evaluated based on the following criteria.

[ light diffusibility of film ]

Method for measuring diffusion

The film for transparent screen was irradiated with light under the following measurement conditions by transmission measurement using a variable angle photometer (model GP-200) using a halogen lamp as a light source manufactured by color research on village, ltd., to measure the emission intensity of light rays and receive light I_θ°. Using the obtained emission intensity to receive light I_θ°The diffusibility B was calculated by the following formula (I).

(in the above formula (I), I_θIndicating the intensity of light emitted in a direction at an angle θ ° with respect to a direction perpendicular to the transparent screen film).

In the measurement, sensitivity was first adjusted so that the light emission intensity at a light receiving angle of 3 ° became 85% without placing the transparent panel film.

The optical filter: is free of

Beam aperture: 6.0

A light receiving aperture: 4.0

Angle of incidence: 0 degree

The sample inclination angle: 0 degree

Light reception start angle: -90 °

Light reception end angle: at 90 deg..

[ color reproducibility of film ]

A400 nm, 500nm, 600nm or 700nm band-pass filter was inserted between the light source and the film for transparent screen to measure the diffusibility. The measurement method was performed in the same manner as the evaluation of the light diffusibility of the film described above. The diffusivities were expressed as B (400), B (500), B (600), and B (700), respectively, and the average value, standard deviation, and relative standard deviation of B (400), B (500), B (600), and B (700) were calculated.

[ writability ]

The image clarity (%) when measured with an optical comb width of 0.125mm was defined as the image clarity according to JIS K7374 using a measuring machine for image clarity (model ICM-1T) manufactured by SUGA TEST INSTRUMENTS CO., LTD.

Next, the transparency of the film, the visibility of the projector image, and the color tone of the projector were evaluated by visual observation based on the following criteria.

[ evaluation criteria for transparency ]

Particularly good: the film was very transparent.

Good: the film was transparent.

Poor: the film was cloudy and poor in transparency.

[ production and evaluation of transparent Panel ]

As the transparent screen, the sheet and the film produced in the above examples and comparative examples were set at the position of the image projection lens 2m of a distance moving projector (product name: XJ-A142, manufactured by Kaxiou computer Co., Ltd.). Then, an image is projected from 45 ° below the screen, and the focus knob of the projector is adjusted so as to be in focus at the position of the screen. The projector image visibility was evaluated by visual observation based on the following criteria, i.e., the image visibility when observed from the front 1m, the image visibility when observed from 1m in front of the projector at an angle of 45 °, and the color tone of the image. The evaluation of the visibility of the image was performed in a dark room, and the evaluation was performed by moving the observation screen, which is the opposite surface of the projector, to transmit light. The evaluation results are shown in tables 1 and 2 below.

[ evaluation criteria for visibility of image ]

Particularly good: the image of the screen is very sharp.

Good: the image of the screen is vivid.

Slightly poor: the image of the screen is somewhat unsharp.

Poor: the image of the screen is not sharp.

[ 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.

Slightly poor: the screen image appeared bluish and the color reproducibility was slightly low.

Poor: the blue color of the screen image is enhanced and the color reproducibility is low.

[ Table 1]

[ Table 2]

Claims

1. A resin composition for a transparent screen, characterized in that:

comprising a thermoplastic resin (A) and inorganic particles (B),

2. The resin composition for transparent screens according to claim 1, characterized in that:

the inorganic particles (B) are contained in an amount of 0.001 to 0.015 part by mass per 100 parts by mass of the thermoplastic resin (A).

3. The resin composition for transparent screens according to claim 1 or 2, characterized in that:

the inorganic particles (B) have a polydispersity coefficient of 0.8 or less.

4. The resin composition for transparent screens according to any one of claims 1 to 3, characterized in that:

the inorganic particles (B) contain at least one selected from the group consisting of oxides and composite oxides of at least 1 element selected from Bi, Nd, Si, Al and Zr, and mixtures of at least one of the oxides and the composite oxides.

5. The resin composition for transparent screens according to claim 4, characterized in that:

the inorganic particles (B) contain at least one of an oxide of Bi, a composite oxide, and a mixture of at least one of the oxide and the composite oxide.

6. The resin composition for transparent screens according to any one of claims 1 to 5, characterized in that:

the inorganic particles (B) have a Z-average particle diameter of 600 to 3000 nm.

7. A film for a transparent screen, characterized in that:

comprising the resin composition for transparent screens as claimed in any one of claims 1 to 6.

8. A film for a transparent screen, characterized in that:

comprising a thermoplastic resin (A) and inorganic particles (B),

9. The film for a transparent screen according to claim 7 or 8, wherein:

the Z-average particle diameter of the inorganic particles (B) in a state in which the film for a transparent screen is dissolved in a solvent is 400 to 7000 nm.

10. The film for a transparent screen according to claim 9, wherein:

the inorganic particles (B) have a Z-average particle diameter of 500 to 3700 nm.

11. The film for a transparent screen according to any one of claims 7 to 10, wherein:

the inorganic particles (B) contain at least one of an oxide and a composite oxide of Bi and a mixture of at least one of the oxide and the composite oxide.

12. The film for a transparent screen according to any one of claims 7 to 11, wherein:

the particle diameter of particles of which the number is 30% or more based on the number of the inorganic particles (B) contained in the film for a transparent panel is in the range of 300 to 2000 nm.

13. The film for a transparent screen according to any one of claims 7 to 12, wherein:

the average particle diameter of the inorganic particles (B) contained in the film for a transparent screen is 300 to 3000 nm.

14. The film for a transparent screen according to any one of claims 7 to 13, wherein:

the thickness is 10 to 3000 μm.

15. The film for a transparent screen according to any one of claims 7 to 14, wherein:

the total light transmittance measured according to the methods specified in JIS-K-7361 and JIS-K-7136 is 70% or more.

16. The film for a transparent screen according to any one of claims 7 to 15, wherein:

the haze measured according to the methods specified in JIS-K-7361 and JIS-K-7136 was 70% or less.

17. The film for a transparent screen according to any one of claims 7 to 16, wherein:

the value of the diffusivity B defined by the following formula is in the range of 2 to 70,

in the above formula (I), I_θThe emission intensity of light rays emitted in a direction having an angle theta DEG with respect to the direction perpendicular to the film is received,

the emergent intensity is received light I_θThe film was subjected to sensitivity adjustment in a state where the film was not placed so that the emission intensity of light at a light receiving angle of 3 ° became 85%, and then the film was irradiated with light by transmission measurement under the following conditions,

the optical filter: is free of,

Beam aperture: 6.0 part of,

A light receiving aperture: 4.0 percent of,

Angle of incidence: 0 degree,

The sample inclination angle: 0 degree,

Light reception start angle: at-90 DEG,

Light reception end angle: at 90 deg..

18. The film for a transparent screen according to any one of claims 7 to 17, wherein:

when the diffusivities of the light irradiated to the film at wavelengths of 400nm, 500nm, 600nm and 700nm are represented as B (400), B (500), B (600) and B (700), respectively, the relative standard deviations of B (400), B (500), B (600) and B (700) are in the range of 0 to 20%.

19. The film for a transparent screen according to any one of claims 7 to 18, wherein:

the YI value of the film for a transparent screen measured according to the geometric condition (f) of JIS Z8722 is 5 or less.

20. A method of manufacturing a transparent screen, comprising:

the resin composition for transparent screens as claimed in any one of claims 1 to 6 is used.