TW201919879A - Optical body and window material - Google Patents

Abstract

Provided is an optical body which has excellent resistance to ultraviolet rays, while being suppressed in the color of reflected light and changes thereof. This optical body is provided with a base layer, a first transparent inorganic layer and a second transparent inorganic layer, and is characterized in that: the first transparent inorganic layer is composed of a transparent inorganic layer A, a transparent inorganic layer B, and an intermediate partition layer that is arranged between the transparent inorganic layer A and the transparent inorganic layer B; the first transparent inorganic layer is arranged on the base layer so that the transparent inorganic layer B is on the base layer side; and the second transparent inorganic layer is arranged on the first transparent inorganic layer.

Description

Optical body and window material

The present invention relates to an optical body and a window material, and more particularly, to an optical body having excellent ultraviolet resistance and capable of reducing the color and change of reflected light, and a window material including the same.

In recent years, in buildings including high-rise buildings, high-rise apartments, and the like, the so-called reflected light hazard, which reflects glare on the installed window glass and the like, and brings glare to users of other neighboring buildings, has frequently become a problem. This problem is also a cause in the following aspects: the increase in the number of glass-inlaid buildings in the Ministry of Urban Affairs and the increase in reflected light itself; Under such circumstances, it is required to take sufficient countermeasures against the hazard of the reflected light during the construction of the building.

Here, as a countermeasure against the glare of the reflected light originating from the window glass of the building, for example, a method of directly blocking the reflected light by installing a shutter or the like on the wall surface of the building is mentioned. However, regarding the installation of shutters, the project is large-scale and costly, and it also affects the design of the building, so the owners mostly stay away from it.

On the other hand, as a method of improving the anti-glare property of a window glass of a building, in addition to the above-mentioned method, a method of externally attaching a film to the window glass to improve the reflection characteristics may be mentioned.

For example, as a film capable of improving reflection characteristics including anti-glare properties, Patent Document 1 discloses that an optical film can be obtained by using an ultraviolet curable resin on a base film to randomly form an anti-glare surface having an uneven surface (AG) layer, and forming a layer containing a low-refractive index resin so that the uneven shape is flattened, whereby the reflectance in the visible light region can be smoothed, and black can be made prominent when attached to a display.

In addition, Patent Document 2 discloses that a film can be obtained by using a UV-curable resin on a base film and transferring the unevenness on the mold surface to obtain a film. The surface of the mold, thereby maintaining high transmittance and reducing glare. [Prior Art Literature] [Patent Literature]

[Patent Document 1] International Publication No. 2015/071943 [Patent Document 2] Japanese Patent Laid-Open No. 2016-012095

[Problems to be Solved by the Invention] In addition, an externally applied film is sometimes used for a window glass provided in a severe outdoor environment such as being exposed to a large amount of ultraviolet rays. In such a case, ultraviolet resistance is required to be particularly high. . In addition, the film to be attached to the window glass sometimes has a very wide viewing range, and it is desirable that the color of the reflected light from various angles is close to neutral. However, the above-mentioned conventional technology focuses only on anti-glare properties, reflectance, and the like, and there is room for improvement in terms of further achieving a balance between high ultraviolet resistance and reduction in color.

An object of the present invention is to solve the above-mentioned various problems and achieve the following objects. That is, an object of the present invention is to provide an optical body having excellent ultraviolet resistance and capable of reducing the color and change of reflected light, and a window material having excellent ultraviolet resistance and capable of reducing the color and change of reflected light.

[Means for Solving the Problem] In order to achieve the above-mentioned object, the present inventors and the like have conducted researches that are not limited to films. As a result, it was found that by forming a specific layer structure, both high UV resistance and reduction in color can be achieved, and the present invention has been completed.

This invention is based on the said knowledge of this inventor, The means for solving the said subject are as follows. That is, <1> An optical body including a base layer, a first transparent inorganic layer, and a second transparent inorganic layer. The optical body is characterized in that the first transparent inorganic layer includes a transparent inorganic layer A and a transparent layer. The inorganic layer B and an intermediate division layer between the transparent inorganic layer A and the transparent inorganic layer B, and the first transparent inorganic layer is disposed on the substrate such that the transparent inorganic layer B becomes a substrate layer side. On the layer, the second transparent inorganic layer is disposed on the first transparent inorganic layer.

<2> The optical body according to the above <1>, wherein the first transparent inorganic layer contains at least any one of ZnO and CeO ₂ , and the second transparent inorganic layer contains SiO ₂ , SiN, SiON, and MgF any one of at least _2.

<3> The optical body according to <1> or <2>, wherein the intermediate division layer contains only SiO ₂ .

<4> The optical body according to any one of <1> to <3>, wherein a ratio of a thickness of the transparent inorganic layer B in a total thickness of the first transparent inorganic layer is 30% or less .

<5> The optical body according to any one of <1> to <4>, further comprising an adhesion layer between the base layer and the first transparent inorganic layer.

<6> The optical body according to any one of <1> to <5>, further including a third transparent inorganic layer on the second transparent inorganic layer.

<7> The optical body according to any one of <1> to <6>, wherein a thickness of the intermediate division layer is 30 nm or more and 60 nm or less.

<8> A window material comprising a glass substrate and the optical body according to any one of <1> to <7>.

[Effects of the Invention] According to the present invention, it is possible to provide an optical body excellent in ultraviolet resistance and capable of reducing the color and change of reflected light, and a window material having excellent ultraviolet resistance and capable of reducing the color and change of reflected light.

(Optical Body) As shown in FIG. 1, an optical body (hereinafter, sometimes referred to as “optical body of this embodiment”) 60 according to an embodiment of the present invention includes at least a base layer 63, a first transparent inorganic layer 64, And the second transparent inorganic layer 65. The first transparent inorganic layer 64 includes a transparent inorganic layer A (64a), a transparent inorganic layer B (64b), and an intermediate division layer 64m between these layers. The transparent inorganic layer B (64b) is used as the base layer 63. It is disposed on the base layer 63 in a lateral manner. That is, the optical body of this embodiment is formed by sequentially laminating at least the base layer 63, the transparent inorganic layer B (64b), the intermediate division layer 64m, the transparent inorganic layer A (64a), and the second transparent inorganic layer 65. Furthermore, the optical body of this embodiment may further include a third transparent inorganic layer, an adhesion layer, an antifouling coating, and other layers, if necessary. In addition, the term "transparent" or "having transparency" in this specification means that an image is clearly seen through an optical body through a high degree of sharpness of the image.

<Base layer> The base layer is a layer which is positioned as the base of the optical body of this embodiment. The material of the base layer is not particularly limited, and examples thereof include: polyethylene terephthalate (PET), polycarbonate (PC), and polymethyl methacrylate (PMMA) Plastic materials used in the field of general optical films such as vinyl chloride, vinyl chloride, and fluororesin, and glass may also be used.

Moreover, the material or specific structure of the base layer is not particularly limited. Among these, from the viewpoint of improving the anti-glare property, the base layer 63 preferably has a fine uneven surface as shown in FIG. 2. In this case, the fine uneven structure on the surface of the base layer 63 may be formed in a regular pattern or may be formed randomly.

In addition, as shown in FIG. 2, the base layer 63 having a fine uneven surface may be composed of a base material 61 and a resin layer 62 having a fine uneven structure, or may be formed by directly forming a fine uneven structure on a resin-containing substrate. (Not shown).

Here, the base layer having a fine uneven surface (hereinafter, sometimes referred to as a "fine uneven layer") can be formed by, for example, a shape transfer method, a phase separation method, a filler dispersion method, or the like. Hereinafter, as an example, a method for forming a fine uneven layer by a shape transfer method will be described with reference to FIG. 3.

FIG. 3 is a schematic diagram showing a shape transfer method as an example of a method for forming a fine uneven layer of the optical body according to the embodiment. The shape transfer device 1 shown in FIG. 3 includes a master plate 2, a substrate supply roller 51, a take-up roller 52, a guide roller 53, a guide roller 54, a nip roller 55, a peeling roller 56, a coating device 57, and a light source 58.

The substrate supply roller 51 is a roller that winds the sheet-shaped substrate 61 into a roll shape, and the take-up roller 52 is a roller that winds the substrate 61 after laminating the resin layer 62 to which the fine uneven structure 23 is transferred. The guide roller 53 and the guide roller 54 are rollers that transport the substrate 61. The nip roller 55 is a roller that adheres the base material 61 on which the resin layer 62 is laminated to the cylindrical original plate 2, and the peeling roller 56 is a substrate on which the resin layer 62 is laminated after transferring the fine uneven structure 23 to the resin layer 62. Roller in which base material 61 is peeled from original plate 2. Here, the base material 61 may be a plastic base material such as polyethylene terephthalate (PET) or polycarbonate (PC), and may be a plastic transparent film.

The coating device 57 includes a coating mechanism such as a coater, and applies a composition (ultraviolet curable resin composition) containing an ultraviolet curable resin to the substrate 61 to form a resin layer 62. The coating device 57 may be, for example, a gravure coater, a bar coater, a die coater, or the like. The light source 58 is a light source that emits ultraviolet light, and may be, for example, an ultraviolet lamp.

The ultraviolet-curable resin is a resin that decreases its fluidity by being irradiated with ultraviolet rays and is cured, and specifically, acrylic resins and the like are mentioned. In addition, the ultraviolet curable resin composition may contain an initiator, a filler, a functional additive, a solvent, an inorganic material, a pigment, an antistatic agent, a sensitizing dye, and the like, as necessary.

In the shape transfer device 1, first, a sheet-like substrate 61 is continuously fed out from a substrate supply roller 51 via a guide roller 53. The ultraviolet curable resin composition is applied to the substrate 61 that has been sent out by the application device 57, and the resin layer 62 is laminated on the substrate 61. In addition, the base material 61 on which the resin layer 62 is laminated is adhered to the original disk 2 by a nip roller 55. Thereby, the fine uneven structure 23 formed on the outer peripheral surface of the original disk 2 is transferred to the resin layer 62. After the fine uneven structure 23 is transferred, the resin layer 62 is hardened by irradiation of light from the light source 58. Then, the base material 61 on which the cured resin layer 62 is laminated is peeled from the original disk 2 by a peeling roller 56, and is wound by a winding roller 52 via a guide roller 54. With such a shape transfer device 1, a fine uneven layer having a fine uneven surface can be continuously formed. Here, the structure of the fine uneven surface can be adjusted, for example, by appropriately changing the fine uneven structure 23 of the original disk 2.

<First transparent inorganic layer> The optical body of this embodiment includes a first transparent inorganic layer. As shown in FIG. 1, the first transparent inorganic layer 64 includes a transparent inorganic layer A (64 a), a transparent inorganic layer B (64 b), and an intermediate division layer 64 m between these layers. The inventors have found that by setting the first transparent inorganic layer in the optical body to have such a structure, ultraviolet absorption can be effectively improved, and ultraviolet resistance can be improved compared to a case where the first transparent inorganic layer is a single layer. , And can reduce the color and change of reflected light. The first transparent inorganic layer has transparency and may have a function of absorbing light of a predetermined wavelength, for example. In addition, as shown in FIGS. 1 and 2, the first transparent inorganic layer 64 is disposed on the base layer 63 such that the transparent inorganic layer B (64 b) becomes the side of the base layer 63 (or, if it is present, it is closely adhered). Layer). Further, the transparent inorganic layer A (64a), the intermediate division layer 64m, and the transparent inorganic layer B (64b) can be formed by, for example, a sputtering method, a vacuum evaporation method, or a chemical vapor deposition (CVD) method. . In addition, the first transparent inorganic layer 64 may further include one or more transparent inorganic layers in addition to the transparent inorganic layer A (64a) and the transparent inorganic layer B (64b), and correspondingly, it may be applied to the transparent inorganic layer. The interval further includes more than one intermediate segmentation layer. Among them, from the viewpoint of more surely obtaining a desired effect, the first transparent inorganic layer 64 preferably includes only the transparent inorganic layer A (64a), the intermediate division layer 64m, and the transparent inorganic layer B (64b).

The first transparent inorganic layer preferably contains at least one of ZnO and CeO ₂ . In particular, as will be clear from the description below, it is more preferable that the transparent inorganic layer A and the transparent inorganic layer B contain at least one of ZnO and CeO ₂ . In this specification, "ZnO" is assumed to include ZnO doped with aluminum (Al) and ZnO doped with other elements. In this specification, “CeO ₂ ” is assumed to include CeO ₂ (sometimes collectively referred to as CeGdO ₂ ) (Ce _0.9 Gd _0.1 O _2, etc.) doped with gadolinium (Gd), and gadolinium (Sm). It was doped CeO ₂ (sometimes collectively referred CeSmO _2), and carried out by other elements (e.g., Zr, Y, etc.) doped CeO _2.

The total thickness of the first transparent inorganic layer is preferably 100 nm or more, and more preferably 300 nm or less. When the total thickness of the first transparent inorganic layer is 100 nm or more, sufficiently high UV resistance can be obtained, and when it is 300 nm or less, the risk of lowering productivity or cracks can be suppressed. From the same viewpoint, the total thickness of the first transparent inorganic layer is more preferably 120 nm or more, and more preferably 200 nm or less. In addition, as described above, the first transparent inorganic layer in the optical body of the embodiment has a multilayer structure as described above, but is more excellent in ultraviolet resistance than the case of a single layer. Therefore, it is possible to maintain the ultraviolet resistance well, and it is also possible to reduce the thickness of the first transparent inorganic layer, and further reduce the thickness of the optical body.

As shown in FIG. 2, the first transparent inorganic layer 64 (the transparent inorganic layer A (64a), the intermediate division layer 64m, and the transparent inorganic layer B (64b)) is preferably from the viewpoint of effectively improving antiglare properties. Together with the base layer 63, it has a fine uneven surface. Such a first transparent inorganic layer can be formed by, for example, laminating a predetermined component on a base layer having a fine uneven surface by a sputtering method, a vacuum evaporation method, or a CVD method.

The light transmittance of the first transparent inorganic layer at a wavelength of 320 nm is preferably 6% or less, and more preferably 3% or less. Since the first transparent inorganic layer has a light transmittance at a wavelength of 320 nm of 6% or less, it is possible to effectively suppress deterioration of the substrate such as yellowing caused by ultraviolet rays. The light transmittance at a wavelength of 320 nm of the first transparent inorganic layer can be measured using, for example, "V-560" manufactured by JASCO Corporation. The light transmittance of the first transparent inorganic layer at a wavelength of 320 nm can be adjusted by, for example, adjusting the main components and thicknesses of the transparent inorganic layer A, the intermediate division layer, and the transparent inorganic layer B, respectively.

-Transparent inorganic layer A- The main component of the transparent inorganic layer A is preferably an inorganic compound having a band gap of 2.8 eV or more and 4.8 eV or less. Here, the band gap indicates the wavelength at the absorption end, and in a broad sense, it means that light that is lower than the wavelength corresponding to the band gap is absorbed, and light that is higher than the wavelength corresponding to the band gap is transmitted. In addition, the band gap above 2.8 eV and below 4.8 eV represents a wavelength λ and a band gap obtained by using Planck constant (6.626 × 10 ^-34 J · s) and light speed (2.998 × 10 ⁸ m / s). The relational expression of the energy E: "λ (nm) = 1240 / E (eV)", which is approximately the wavelength at the absorption end in the range between 260 nm and 440 nm, which is the boundary between the ultraviolet region and the visible region. Therefore, by using the inorganic compound for the transparent inorganic layer A, it is possible to achieve both transparency and ultraviolet absorption characteristics. From the same viewpoint, the main component of the transparent inorganic layer A is more preferably an inorganic compound having a band gap of 3.0 eV or more and 3.7 eV or less (approximately 340 nm or more and 420 nm or less in wavelength conversion). In addition, if the thin film is also formed in order to suppress the risk of reduced productivity or cracks, the main component of the transparent inorganic layer A is more preferably 3.0 eV or more and 3.4 eV or less (approximately 360 nm or more in wavelength conversion and 420 nm or less) Band gap inorganic compound. The "main component" in this specification refers to a component having the largest content.

Examples of the inorganic compound having a band gap of 2.8 eV to 4.8 eV include ZnO, CeO ₂ , TiO ₂ , SnO ₂ , In ₂ O ₃ , Nb ₂ O ₅ , Ta ₂ O ₅ , and SiC. , ZnS, etc. Examples of the inorganic compound having a band gap of 3.0 eV or more and 3.7 eV or less include ZnO, CeO ₂ , TiO ₂ , Nb ₂ O ₅ , SiC, and ZnS. Furthermore, as examples of the inorganic compound having a band gap of 3.0 eV or more and 3.4 eV or less, specific examples include ZnO, CeO ₂ and the like. View of the above, a transparent inorganic layer A is preferably at least any one of ZnO and CeO _2, and more preferably containing ZnO and CeO _2, and further comprising best only ZnO and CeO _2. These inorganic compounds may be used alone in the transparent inorganic layer A, or may be used in combination of two or more in the transparent inorganic layer A. In addition, in the present specification, "contains only" means that only the above-mentioned components are substantially included, and specifically, the above-mentioned components are 99.9% by mass or more.

-Intermediate Dividing Layer- The intermediate dividing layer is a layer that is arranged between the transparent inorganic layer A and the transparent inorganic layer B to improve the ultraviolet resistance of the optical body and to adjust the color of the reflected light.

The main component of the intermediate division layer is preferably one having a lower refractive index than the main component of the transparent inorganic layer A and the main component of the transparent inorganic layer B, and is not particularly limited, and examples thereof include inorganic materials such as SiO ₂ , SiN, SiON, and MgF ₂ Compound. In other words, the intermediate division layer may contain at least any one of SiO ₂ , SiN, SiON, and MgF ₂ . In addition, the intermediate division layer preferably contains at least SiO ₂ , and more preferably contains only SiO ₂ . These inorganic compounds may be used alone in the intermediate partition layer, or may be used in combination of two or more in the intermediate partition layer.

The thickness of the intermediate division layer is preferably 30 nm or more, and preferably 60 nm or less. When the thickness of the intermediate division layer is 30 nm or more, the light transmittance in the optical body, especially the light transmittance at a wavelength of 320 nm, can be effectively reduced, and the ultraviolet resistance can be significantly improved. In addition, when the thickness of the intermediate division layer is 60 nm or less, deterioration of high ultraviolet absorption characteristics caused by the transparent inorganic layer A and the transparent inorganic layer B can be suppressed.

In addition, the proportion of the thickness of the intermediate division layer in the total thickness of the first transparent inorganic layer is preferably 20% or more, and more preferably 40% or less. When the ratio is 20% or more, it is possible to reduce the light transmittance in the optical body, particularly the light transmittance at a wavelength of 320 nm, and significantly improve the ultraviolet resistance. In addition, when the ratio is 40% or less, deterioration of high ultraviolet absorption characteristics caused by the transparent inorganic layer A and the transparent inorganic layer B can be suppressed.

-Transparent Inorganic Layer B- A preferable main component of the transparent inorganic layer B is the same as that described in the transparent inorganic layer A. Specifically, a transparent inorganic layer B is preferably at least any one of ZnO and CeO _2, and more preferably of ZnO and CeO _2. The composition of the transparent inorganic layer B is preferably the same as the composition of the transparent inorganic layer A.

The ratio of the thickness of the transparent inorganic layer B in the total thickness of the first transparent inorganic layer is preferably 30% or less. By setting the ratio to 30% or less, the UV resistance can be maintained well, and the values of a * and b * in the a * b * color system are closer to zero, which can make light relative to light from various angles. The color of the incident reflected light becomes more neutral. From the same viewpoint, the ratio of the thickness of the transparent inorganic layer B in the total thickness of the first transparent inorganic layer is more preferably 20% or less, and even more preferably 10% or less.

The ratio of the thickness of the transparent inorganic layer B in the total thickness of the transparent inorganic layer A and the transparent inorganic layer B is preferably 30% or less. When the ratio is 30% or less, the UV resistance can be maintained well, and the values of a * and b * in the a * b * color system are closer to zero, which can make the light relative to light from various angles. The color of the incident reflected light becomes more neutral. From the same viewpoint, the ratio of the thickness of the transparent inorganic layer B in the total thickness of the first transparent inorganic layer is more preferably 20% or less, and even more preferably 10% or less.

<The second transparent inorganic layer> The optical body of this embodiment includes a second transparent inorganic layer. The second transparent inorganic layer has transparency, and may have a function of preventing adhesion of dirt caused by rain or the like to the first transparent inorganic layer, or a function of adjusting the color of the reflected light. As shown in FIGS. 1 and 2, the second transparent inorganic layer 65 is disposed on the first transparent inorganic layer 64 and can be formed by, for example, a sputtering method, a vacuum evaporation method, or a CVD method.

The main component of the second transparent inorganic layer is preferably a band gap having a larger band gap than the main component of the first transparent inorganic layer, and more specifically, a band having a main component that is larger than the main component of the first transparent inorganic layer. Inorganic compound with a band gap larger than 4.0 eV. The band gap of the main component of the second transparent inorganic layer is larger than the band gap of the main component of the first transparent inorganic layer, and is preferably greater than 4.0 eV. In addition to improving the antifouling property of the first transparent inorganic layer, The anti-glare property of the obtained optical body is improved. The main component of the second transparent inorganic layer is preferably one having a lower refractive index than the main component of the transparent inorganic layer A and the main component of the transparent inorganic layer B. Specifically, examples of the main component of the preferred second transparent inorganic layer include inorganic compounds such as SiO ₂ , SiN, SiON, and MgF ₂ . In other words, the second transparent inorganic layer preferably contains at least any one of SiO ₂ , SiN, SiON, and MgF ₂ . The second transparent inorganic layer more preferably contains at least SiO ₂ . These inorganic compounds may be used alone in the second transparent inorganic layer, or may be used in combination of two or more in the second transparent inorganic layer.

The thickness of the second transparent inorganic layer is preferably 20 nm or more, and more preferably 200 nm or less. When the thickness of the second transparent inorganic layer is 20 nm or more and 200 nm or less, the reflectance can be sufficiently reduced, and the anti-glare property can be more effectively improved. From the same viewpoint, the thickness of the second transparent inorganic layer is more preferably 40 nm or more, and more preferably 100 nm or less.

As shown in FIG. 2, the second transparent inorganic layer 65 preferably has a fine uneven surface together with the base layer 63 and the first transparent inorganic layer 64 from the viewpoint of effectively improving anti-glare properties. Such a second transparent inorganic layer can be formed by, for example, laminating a first transparent inorganic layer on a base layer having a fine uneven surface by a sputtering method, a vacuum evaporation method, or a CVD method, and then using a sputtering method, a vacuum evaporation method, or CVD. It is formed by stacking prescribed components.

<Third Transparent Inorganic Layer> As shown in FIG. 4, in addition to the first transparent inorganic layer 64 and the second transparent inorganic layer 65, the optical body of this embodiment preferably includes a third transparent inorganic layer 65 on the second transparent inorganic layer 65. Transparent inorganic layer 66. By including the third transparent inorganic layer, adhesion of dirt caused by rain or the like to the second transparent inorganic layer can be prevented. The third transparent inorganic layer has transparency, may be water-repellent or hydrophilic, and may be formed by, for example, a sputtering method, a vacuum evaporation method, or a CVD method.

The third transparent inorganic layer may contain SiO ₂ as a main component. The third transparent inorganic layer preferably further contains ZrO ₂ . By containing the SiO ₂ and ZrO ₂ together in the third transparent inorganic layer, the alkali resistance of the optical body is improved. For example, the optical body can be preferably used in an environment exposed to chemicals or in a severe outdoor environment. Imagine acid rain, calcium hydroxide dissolved from concrete, salt water, water + sunlight, etc.) in window glass.

The proportion of ZrO ₂ in the third transparent inorganic layer is preferably 6 mass% or more and 50 mass% or less. When the proportion of ZrO ₂ is 6% by mass or more, the improvement effect of chemical resistance, especially alkali resistance can be sufficiently obtained, and when it is 50% by mass or less, the bonding with the second transparent inorganic layer can be appropriately maintained. The refractive index difference can avoid the difficulty of optical design. From the same viewpoint, the proportion of ZrO ₂ in the third transparent inorganic layer is more preferably 13% by mass or more, still more preferably 20% by mass or more, and even more preferably 40% by mass or less.

The thickness of the third transparent inorganic layer is preferably 20 nm or more. When the thickness of the third transparent inorganic layer is 20 nm or more, sufficiently high chemical resistance can be obtained. The thickness of the third transparent inorganic layer is preferably 200 nm or less. When the thickness of the third transparent inorganic layer is 200 nm or less, it is possible to suppress the risk of reduced productivity or cracks. From the same viewpoint, the thickness of the third transparent inorganic layer is more preferably 100 nm or less.

<Adhesive Layer> As shown in FIG. 5, in order to firmly adhere the base layer 63 and the first transparent inorganic layer 64, the optical body of this embodiment preferably includes an adhesive layer between the layers. 67. Examples of the adhesion layer include a SiO _x layer. The thickness can be, for example, 2 nm to 10 nm. From the viewpoint of avoiding the influence of coloring and the viewpoint of functioning with a minimum necessary material, the thickness is preferable. It is 8 nm or less, and more preferably 5 nm or less. The adhesion layer can be formed by, for example, a sputtering method, a vacuum evaporation method, or a CVD method. In particular, when a SiO _x layer is formed by a sputtering method, a silicon target can be used to form a film in a state of insufficient oxygen.

<Antifouling Coating> The optical body of this embodiment preferably includes an antifouling coating on the outermost surface of the second transparent inorganic layer. Specifically, the optical body of the present embodiment preferably includes an antifouling coating on the second transparent inorganic layer or the third transparent inorganic layer. By including the antifouling coating, the adhesion of dirt to the optical body can be reduced, and the attached dirt can be easily dropped, so that the optical body can exhibit desired performance for a longer period of time. From the viewpoint of high adhesion, it is preferable to include an antifouling coating on the second transparent inorganic layer or the third transparent inorganic layer containing SiO ₂ as a main component.

The main component of the antifouling coating may be water-repellent or hydrophilic, and may be oil-repellent or lipophilic. Among these, from the viewpoint of more effectively improving the antifouling property, the main component of the antifouling coating is preferably water-repellent and oil-repellent. If the water repellency is specifically described, the pure water contact angle of the antifouling coating is preferably 110 ° or more, and more preferably 115 ° or more. As those having these properties, the main component of the antifouling coating is preferably a perfluoropolyether.

The thickness of the antifouling coating is preferably 5 nm or more, and preferably 20 nm or less, such as 10 nm. When the thickness of the antifouling coating is 5 nm or more, the antifouling property of the optical body can be sufficiently improved, and when it is 20 nm or less, it is possible to avoid embedding of any fine uneven structure.

<Other layers> The optical body of this embodiment is not particularly limited, and may include layers other than the above-mentioned layers.

For example, it is preferable that the optical body of this embodiment includes an adhesive layer that absorbs visible light on the surface of the base layer opposite to the surface on which the first transparent inorganic layer is disposed. Since the surface opposite to the surface on which the first transparent inorganic layer is disposed includes an adhesive layer that absorbs visible light, the glass substrate 81 is laminated on the surface of the optical body including the adhesive layer 84 as shown in FIG. 6. The window material 80 can efficiently absorb visible light transmitted through the second transparent inorganic layer 65, the first transparent inorganic layer 64 and the fine uneven layer 63 and incident on the adhesive layer 84, and transmitted through the second transparent inorganic layer 65 and the first transparent After the inorganic layer 64, the fine uneven layer 63, and the adhesive layer 84 are reflected on the glass substrate 81 and visible light incident on the adhesive layer 84, the visible light transmittance is reduced, and the anti-glare property is further improved. In addition, the use of adhesive layers with different visible light absorptivity also has the advantage that product lines with different gloss can be easily aligned. The adhesive layer that absorbs visible light can be prepared by, for example, dispersing a colorant such as a dye or pigment that absorbs visible light in an adhesive material at an arbitrary ratio. On the other hand, for example, when there are many problems such as a large proportion of dyes or pigments that absorb visible light, a decrease in adhesion, or deterioration in durability, etc., a visible light-absorbing substrate or DLC containing a colorant such as a dye or pigment can be used. An inorganic film that absorbs visible light is laminated on the base layer.

<Characteristics of Optical Body> In addition, the light transmittance of the optical body at a wavelength of 320 nm of the present embodiment is preferably 10% or less, more preferably 6% or less, and even more preferably 3% or less. The optical body has a light transmittance at a wavelength of 320 nm of 10% or less, which effectively suppresses deterioration of the substrate such as yellowing caused by ultraviolet rays, and improves the adhesion durability of the substrate and the resin layer. The light transmittance of the optical body at a wavelength of 320 nm can be measured using, for example, "V-560" manufactured by JASCO Corporation.

(Window material) A window material (hereinafter, sometimes referred to as a "window material of this embodiment") according to an embodiment of the present invention includes a glass substrate and the optical body. Specifically, as shown in FIG. 7, the window material 80 according to this embodiment may be such that the optical body 60 and the glass substrate 81 are formed on the surface of the optical body 60 on which the first transparent inorganic layer 64 is not disposed and the glass substrate 81. Layered in opposite ways. As described above, the window material of this embodiment includes at least the above-mentioned optical body, has excellent ultraviolet resistance, and can reduce the color and change of reflected light. Therefore, the window material can be suitably used as a window glass for a high-rise building, a house, or a vehicle. Use window glass, etc. In addition, the window material of this embodiment may include the optical body only on one side of the glass substrate, or may include the optical body on both sides.

The window material of this embodiment may be a multilayer glass. Here, the so-called multilayer glass, as shown in FIGS. 8 (a) to 8 (h), generally means that a plurality of glass substrates (82, 83) are laminated on the peripheral substrate with spacers 85 interposed therebetween, and each glass substrate is laminated. Structure of glass forming a space between. Furthermore, as shown in FIG. 8 (a), as the window material 80 of the present embodiment as a multilayer glass, when it is installed as a window glass in a building or the like, the optical material can be provided only on the outdoor side surface of the glass substrate 82 serving as the outdoor side. As shown in FIGS. 8 (b) to 8 (d), the body 60 may be provided with an optical body 60 on the surface of the outdoor side of the glass substrate 82 serving as the outdoor side, and also on one side of the glass substrate 83 serving as the indoor side. Optical bodies 60 are provided on both sides, and as shown in FIGS. 8 (e) to 8 (h), the optical bodies can be provided on both sides of the glass substrate 82 that becomes the outdoor side, and optionally also becomes the glass that becomes the indoor side. An optical body 60 is provided on one side and / or both sides of the substrate 83.

In addition, when the window material of the present embodiment is a multilayer glass and is installed as a window glass in a building or the like, an optical body is particularly preferably provided on the surface of the outdoor side of the glass substrate on the outdoor side. The surface opposite to the surface on which the first transparent inorganic layer is disposed (more specifically, between the optical body and the glass substrate) includes an adhesive layer that absorbs visible light. By including such an adhesive layer that absorbs visible light, it is possible to efficiently absorb visible light that passes through the optical body and enters the adhesive layer, and after passing through the optical body and the adhesive layer, it reflects on the indoor surface of the glass substrate on the outdoor side and is incident on The visible light of the adhesive layer and the glass substrate on the indoor side are reflected after passing through the optical body, the adhesive layer and the outdoor glass substrate, and the visible light transmitted through the outdoor glass substrate and incident on the adhesive layer to reduce the visible light transmittance. The problem of anti-glare that can be frequently encountered with multilayer glass is eliminated while maintaining a high viewability. [Example]

Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited to the following examples.

(1) Relationship between the thickness of the transparent inorganic layer and the light transmittance at a wavelength of 320 nm Using a composition containing an acrylic ultraviolet curable resin, a resin layer having a fine uneven surface was formed on a PET substrate using a shape transfer method (Manufactured by Toyobo Co., Ltd., "A4300", thickness 75 μm) to obtain a base layer. Then, a first transparent inorganic layer (single layer) containing ZnO and CeO ₂ (ZnO: CeO ₂ = 30: 70 (mass ratio)) was laminated on the fine uneven surface of the resin layer of the base layer by a sputtering method. Then, a second transparent inorganic layer containing SiO ₂ was laminated on the surface of the first transparent inorganic layer by a sputtering method to obtain an optical body. Here, "V-560" manufactured by JASCO Corporation was used to measure a wavelength of 320 for each of the plurality of optical bodies obtained by varying the thickness of the first transparent inorganic layer (single layer) in accordance with JIS A 5759. Light transmittance in nm. The relationship between the thickness of the first transparent inorganic layer (single layer) and the light transmittance at a wavelength of 320 nm is shown in FIG. 9. As can be seen from FIG. 9, the larger the thickness of the first transparent inorganic layer (single layer), the lower the light transmittance at a wavelength of 320 nm, and the higher the ultraviolet resistance. Specifically, if the thickness of the first transparent inorganic layer is 100 nm or more, the transmittance is preferably about 3% or less, and if it is 120 nm or more, the transmittance is preferably about 2% or less.

(2) Relationship between the thickness of the intermediate division layer in the first transparent inorganic layer and the light transmittance at a wavelength of 320 nm. Using a composition containing an acrylic ultraviolet curable resin, a resin having a fine uneven surface was transferred by a shape transfer method. The layer was formed on a PET substrate (manufactured by Toyobo Co., Ltd., "A4300", thickness 75 μm) to obtain a base layer. Next, a transparent inorganic layer B containing ZnO and CeO ₂ (ZnO: CeO ₂ = 30: 70 (mass ratio)) was laminated on the fine uneven surface of the resin layer of the base layer by a sputtering method, and a sputtering method was used. An intermediate division layer containing only SiO ₂ was laminated on the surface of the transparent inorganic layer B, and a transparent inorganic layer A having the same composition as the transparent inorganic layer B was laminated on the surface of the intermediate division layer by a sputtering method. A sputtering method is used to laminate a second transparent inorganic layer containing SiO ₂ on the surface of the transparent inorganic layer A to obtain an optical body. Here, the total thickness of the first transparent inorganic layer is set to 150 nm or 170 nm, and the thickness of the transparent inorganic layer A and the thickness of the transparent inorganic layer B are set to be the same. A plurality of the optical bodies obtained by varying the thickness of the laminated layer were measured for the light transmittance at a wavelength of 320 nm. The relationship between the thickness of the intermediate division layer and the light transmittance at a wavelength of 320 nm is shown in FIG. 10. As can be seen from FIG. 10, by providing the intermediate division layer (those having a thickness exceeding 0), there is a tendency that the light transmittance at a wavelength of 320 nm decreases and the ultraviolet resistance increases. Moreover, it turns out that especially when the thickness of an intermediate division layer is 40 nm-60 nm, there exists a tendency for the transmittance | permeability to fall further and ultraviolet resistance to become higher.

(3) The relationship between the ratio of the thickness of the transparent inorganic layer B and the light transmittance at a wavelength of 320 nm was performed in the same manner as in the above (2) to obtain an optical body. Here, the total thickness of the first transparent inorganic layer was set to 150 nm, and the laminated thickness of the intermediate division layer was set to 10 nm. A plurality of the optical bodies each measure a light transmittance at a wavelength of 320 nm. The relationship between the thickness of the transparent inorganic layer B and the light transmittance at a wavelength of 320 nm is shown in FIG. 11. As can be seen from FIG. 11, even if the thickness of the transparent inorganic layer B in the total thickness of the first transparent inorganic layer is changed, the light transmittance at a wavelength of 320 nm is in the range of 0.6% to 0.8%, and the ultraviolet resistance is not greatly increased. Impact.

(4) The relationship between the thickness of the transparent inorganic layer B and a * and b * of the reflected light is performed in the same manner as in (2) above to obtain an optical body. Here, after the total thickness of the first transparent inorganic layer is set to 150 nm, and the laminated thickness of the intermediate division layer is set to 10 nm, a plurality of the optical elements obtained by changing the laminated thickness of the transparent inorganic layer B in various ways are obtained. Based on the CIELAB color space, based on the CIELAB color space, calculate the a * of the reflected light incident on the light with 5 ° or 60 ° based on the reflection spectrophotometry data obtained using a spectrophotometer and measured in a wavelength range of 300 nm to 800 nm. And b *. The relationship between the thickness of the transparent inorganic layer B and a * and b * is shown in FIG. 12. As can be seen from FIG. 12, even if the thickness of the transparent inorganic layer B in the total thickness of the first transparent inorganic layer is changed, the values of a * and b * at least with respect to the incident reflected light of 60 ° light shift to near zero. Furthermore, it can be seen that, particularly when the ratio of the thickness of the transparent inorganic layer B in the total thickness of the first transparent inorganic layer is 30% or less, a * and b with respect to the reflected light incident on light of 5 ° and 60 ° The value of * is closer to zero. [Industrial availability]

According to the present invention, it is possible to provide an optical body having excellent ultraviolet resistance and reducing the color and change of reflected light, and a window material having excellent ultraviolet resistance and reducing the color and change of reflected light.

1‧‧‧ Shape Transfer Device

2‧‧‧Original

23‧‧‧fine uneven structure

51‧‧‧ substrate supply roller

52‧‧‧ take-up roller

53, 54‧‧‧Guide roller

55‧‧‧ pinch roller

56‧‧‧ peeling roller

57‧‧‧coating device

58‧‧‧light source

60‧‧‧ Optics

61‧‧‧ substrate

62‧‧‧resin layer

63‧‧‧ basal layer (fine uneven layer)

64‧‧‧The first transparent inorganic layer

64a‧‧‧Transparent inorganic layer A

64b‧‧‧ transparent inorganic layer B

64m‧‧‧ middle split layer

65‧‧‧ 2nd transparent inorganic layer

66‧‧‧ 3rd transparent inorganic layer

67‧‧‧ Adhesive layer

80‧‧‧Window

81, 82, 83‧‧‧ glass substrate

84‧‧‧ Adhesive layer

85‧‧‧ spacer

FIG. 1 is a schematic cross-sectional view showing a configuration example of an optical body according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing a configuration example of an optical body according to an embodiment of the present invention. FIG. 3 is a schematic diagram illustrating an example of a method for forming an example of a base layer included in an optical body according to an embodiment of the present invention. 4 is a schematic cross-sectional view showing a configuration example of an optical body according to an embodiment of the present invention. 5 is a schematic cross-sectional view showing a configuration example of an optical body according to an embodiment of the present invention. 6 is a schematic cross-sectional view showing a configuration example of a window material according to an embodiment of the present invention. 7 is a schematic cross-sectional view showing a configuration example of a window material according to an embodiment of the present invention. 8 (a) to 8 (h) are schematic cross-sectional views illustrating a configuration example of a window material according to an embodiment of the present invention. FIG. 9 is a graph showing the relationship between the thickness of the first transparent inorganic layer (single layer) and the light transmittance at a wavelength of 320 nm. FIG. 10 is a diagram showing the relationship between the thickness of the intermediate division layer and the light transmittance at a wavelength of 320 nm. FIG. 11 is a graph showing the relationship between the thickness of the transparent inorganic layer B and the light transmittance at a wavelength of 320 nm. FIG. 12 is a diagram showing the relationship between the thickness of the transparent inorganic layer B and a * and b *.

Claims (8)

An optical body includes a base layer, a first transparent inorganic layer, and a second transparent inorganic layer. The optical body is characterized in that: the first transparent inorganic layer includes a transparent inorganic layer A, a transparent inorganic layer B, and The intermediate divided layer between the transparent inorganic layer A and the transparent inorganic layer B, the first transparent inorganic layer is disposed on the base layer such that the transparent inorganic layer B becomes a base layer side, and the first 2 transparent inorganic layers are arranged on the first transparent inorganic layer. The optical body according to item 1 of the scope of patent application, wherein the first transparent inorganic layer contains at least any one of ZnO and CeO ₂ , and the second transparent inorganic layer contains SiO ₂ , SiN, SiON, and MgF ₂ At least either. The optical body according to item 1 or 2 of the scope of patent application, wherein the intermediate split layer contains only SiO ₂ . The optical body according to any one of claims 1 to 3, wherein a ratio of a thickness of the transparent inorganic layer B in a total thickness of the first transparent inorganic layer is 30% or less. The optical body according to any one of claims 1 to 4 of the patent application scope, further comprising an adhesion layer between the base layer and the first transparent inorganic layer. The optical body according to any one of claims 1 to 5 of the patent application scope, further comprising a third transparent inorganic layer on the second transparent inorganic layer. The optical body according to any one of claims 1 to 6, wherein the thickness of the intermediate division layer is 30 nm or more and 60 nm or less. A window material, comprising: a glass substrate; and the optical body according to any one of items 1 to 7 of the scope of patent application.