JP2019056873A - Optical body and window material - Google Patents

Abstract

To provide an optical body which features superior ultraviolet resistance and reduced color of reflections and variation thereof.SOLUTION: An optical body comprises a base layer, a first transparent inorganic layer, and a second transparent inorganic layer. The first transparent inorganic layer consists of a transparent inorganic layer A, a transparent inorganic layer B, and an intermediate division layer disposed 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 is on the base layer side, and the second transparent inorganic layer is disposed on the top of the first transparent inorganic layer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an optical body and a window material. More specifically, the present invention relates to an optical body excellent in ultraviolet resistance, reduced in color of reflected light and its change, and a window material including the same. Is.

  In recent years, in buildings including high-rise buildings and tower condominiums, so-called reflected light damage is a frequent problem, as light is reflected on the window glass and the like, which causes glare to users of other nearby buildings. It has become. This is because the number of buildings with glass in urban areas has increased and the reflected light itself has increased, and the number of high-rise condominiums that can accommodate many households has increased, and the number of people who suffer from light pollution has increased. It is a cause. Under such circumstances, in the construction of a building, it is required to take sufficient measures against the above-mentioned reflected light damage.

  Here, as a countermeasure against glare of reflected light from the window glass of the building, for example, a method of directly blocking the reflected light by installing a louver or the like on the wall surface of the building can be mentioned. However, the installation of louvers is often avoided by the owner because the construction is large and expensive, and affects the design of the building.

  On the other hand, as a method for improving the antiglare property of the window glass of a building, there is a method of improving reflection characteristics by externally attaching a film to the window glass in addition to the above-described method.

  For example, as a film that can improve reflection characteristics including anti-glare properties, Patent Document 1 forms an AG (anti-glare) layer having a random concavo-convex shape surface on a base film using an ultraviolet curable resin, and the concavo-convex thereof. By forming a layer made of a low-refractive index resin so as to flatten the shape, an optical film that can make black stand out when applied to a display while flattening the reflectance in the visible light region is obtained. Is disclosed.

  Further, Patent Document 2 uses a mold surface obtained by striking blast particles having a predetermined particle size when a film is obtained by transferring and forming unevenness on the mold surface using an ultraviolet curable resin on a base film. Thus, it is disclosed that a film with reduced glare can be obtained while maintaining high transmission definition.

International Publication No. 2015/071943 Japanese Patent Laid-Open No. 2006-012095

  By the way, an externally attached film may be used for a window glass installed in a harsh outdoor environment that is exposed to a large amount of ultraviolet rays. Desired. Moreover, the film to be externally attached to the window glass may have a very wide range, and it is desirable that the color of reflected light from various angles is close to neutral. However, the above-described conventional technology focuses only on anti-glare properties and reflectivity, and there is room for improvement in terms of further achieving both high UV resistance and reduction in color.

  An object of the present invention is to solve the above-described problems and achieve the following objects. That is, an object of the present invention is an optical body having excellent ultraviolet resistance and reduced reflected light color and change thereof, and a window having excellent ultraviolet resistance and reflected light color and change thereof reduced. To provide materials.

  In order to achieve the above-mentioned object, the present inventors have conducted intensive studies without being limited to films. As a result, it has been found that a specific layer configuration can achieve both high UV resistance and reduction in color, and the present invention has been completed.

The present invention is based on the above findings by the present inventors, and means for solving the above problems are as follows. That is,
<1> An optical body comprising a base layer, a first transparent inorganic layer, and a second transparent inorganic layer,
The first transparent inorganic layer comprises a transparent inorganic layer A, a transparent inorganic layer B, and an 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 so that the transparent inorganic layer B is on the base layer side,
The second transparent inorganic layer is disposed on the first transparent inorganic layer.
This is an optical body.

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

<3> The optical body according to <1> or <2>, wherein the intermediate divided layer is made of only SiO ₂ .

<4> The optical body according to any one of <1> to <3>, wherein the ratio of the thickness of the transparent inorganic layer B to the 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 including 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 the intermediate divided layer has a thickness of 30 nm to 60 nm.

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

  According to the present invention, an optical body excellent in ultraviolet resistance, the color of reflected light and its change is reduced, and a window material excellent in ultraviolet resistance and the color of reflected light and its change are reduced. Can be provided.

It is a schematic cross section which shows the structural example of the optical body which concerns on one Embodiment of this invention. It is a schematic cross section which shows the structural example of the optical body which concerns on one Embodiment of this invention. It is a schematic diagram which shows an example method for forming an example base layer with which the optical body which concerns on one Embodiment of this invention is provided. It is a schematic cross section which shows the structural example of the optical body which concerns on one Embodiment of this invention. It is a schematic cross section which shows the structural example of the optical body which concerns on one Embodiment of this invention. It is a schematic cross section which shows the structural example of the window material which concerns on one Embodiment of this invention. It is a schematic cross section which shows the structural example of the window material which concerns on one Embodiment of this invention. It is a schematic cross section which shows the structural example of the window material which concerns on one Embodiment of this invention. It is a figure which shows the relationship between the thickness of a 1st transparent inorganic layer (single layer), and the transmittance | permeability of the light of wavelength 320nm. It is a figure which shows the relationship between the thickness of an intermediate division layer, and the transmittance | permeability of the light of wavelength 320nm. It is a figure which shows the relationship between the thickness of the transparent inorganic layer B, and the transmittance | permeability of the light of wavelength 320nm. It is a figure which shows the relationship between the thickness of the transparent inorganic layer B, and a * and b *.

(Optical body)
As shown in FIG. 1, an optical body according to an embodiment of the present invention (hereinafter sometimes referred to as “optical body according to this embodiment”) 60 includes at least a base layer 63 and a first transparent inorganic material. A layer 64 and a second transparent inorganic layer 65 are provided. The first transparent inorganic layer 64 includes a transparent inorganic layer A (64a), a transparent inorganic layer B (64b), and an intermediate divided layer 64m therebetween, and the transparent inorganic layer B is formed on the base layer 63. (64b) is disposed on the base layer 63 side. That is, the optical body according to this embodiment includes at least the base layer 63, the transparent inorganic layer B (64b), the intermediate divided layer 64m, the transparent inorganic layer A (64a), and the second transparent inorganic layer 65 in this order. Being done. The optical body according to the present embodiment can further include a third transparent inorganic layer, an adhesion layer, an antifouling coating layer, and other layers as necessary.
In the present specification, “transparent” or “having transparency” means that the transmitted image has high definition and the image can be clearly seen through the optical body.

<Base layer>
The base layer is a layer positioned as the base of the optical body according to the present embodiment. The material of the base layer is not particularly limited. For example, plastics used in the field of ordinary optical films such as polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), vinyl chloride, and fluororesin. Materials, and may be glass.

  The base layer is not particularly limited with respect to its material and specific structure. However, the base layer 63 preferably has a fine uneven surface as shown in FIG. 2 from the viewpoint of improving the antiglare property. In this case, the fine uneven structure on the surface of the base layer 63 may be formed in a regular pattern or randomly.

  Further, the base layer 63 having a fine uneven surface may be constituted by, for example, a substrate 61 and a resin layer 62 having a fine uneven structure, as shown in FIG. What formed the fine uneven structure directly (not shown) may be used.

  Here, the base layer having a fine uneven surface (hereinafter sometimes referred to as “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 of forming a fine uneven layer by a shape transfer method will be described with reference to FIG.

  FIG. 3 is a schematic diagram showing a shape transfer method, which is an example of a method for forming the fine uneven layer of the optical body according to the present embodiment. The shape transfer apparatus 1 shown in FIG. 3 includes a master 2, a base material supply roll 51, a winding roll 52, guide rolls 53 and 54, a nip roll 55, a peeling roll 56, a coating apparatus 57, and a light source. 58.

  The base material supply roll 51 is a roll in which a sheet-like base material 61 is wound in a roll shape, and the winding roll 52 winds up the base material 61 on which the resin layer 62 to which the fine concavo-convex structure 23 is transferred is laminated. It is a roll. Further, the guide rolls 53 and 54 are rolls for transporting the base material 61. The nip roll 55 is a roll for bringing the base material 61 on which the resin layer 62 is laminated into close contact with the cylindrical master 2, and the peeling roll 56 is a resin layer after the fine concavo-convex structure 23 is transferred to the resin layer 62. It is a roll which peels the base material 61 on which 62 is laminated from the master 2. Here, the base material 61 can be, for example, a plastic base material such as polyethylene terephthalate (PET) or polycarbonate (PC), or a transparent plastic film.

  The coating device 57 includes coating means such as a coater, and applies a composition containing an ultraviolet curable resin (ultraviolet curable resin composition) to the substrate 61 to form a resin layer 62. The coating device 57 may be, for example, a gravure coater, a wire bar coater, or a die coater. 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 is hardened and loses fluidity when irradiated with ultraviolet rays, and specific examples thereof include acrylic resins. Moreover, 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, or the like, if necessary.

In the shape transfer device 1, first, the sheet-like base material 61 is continuously fed from the base material supply roll 51 through the guide roll 53. The ultraviolet curable resin composition is applied to the delivered base material 61 by the coating device 57, and the resin layer 62 is laminated on the base material 61. The substrate 61 on which the resin layer 62 is laminated is in close contact with the master 2 by the nip roll 55. As a result, the fine uneven structure 23 formed on the outer peripheral surface of the master 2 is transferred to the resin layer 62. After the fine concavo-convex structure 23 is transferred, the resin layer 62 is cured by light irradiation from the light source 58. Subsequently, the base material 61 on which the cured resin layer 62 is laminated is peeled off from the master 2 by the peeling roll 56, and taken up by the winding roll 52 via the guide roll 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 master 2.

<First transparent inorganic layer>
The optical body according to 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 (64a), a transparent inorganic layer B (64b), and an intermediate divided layer 64m therebetween. The inventors of the present invention have the structure in which the first transparent inorganic layer in the optical body has such a structure, so that the ultraviolet absorbing ability is efficiently improved, and the ultraviolet light resistance is higher than that in the case where the first transparent inorganic layer is a single layer. It has been found that the color of reflected light and its change can be reduced as the properties increase. The first transparent inorganic layer can have transparency and a function of absorbing light having a predetermined wavelength, for example. As shown in FIGS. 1 and 2, the first transparent inorganic layer 64 is formed on the base layer 63 (or on the adhesion layer if present), and the transparent inorganic layer B (64b) is formed on the base layer 63. It is arranged to be on the side. The transparent inorganic layer A (64a), the intermediate divided layer 64m, and the transparent inorganic layer B (64b) can be formed by, for example, a sputtering method, a vacuum evaporation method, or a CVD method.
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). You may provide further intermediate | middle division layers more than a layer between transparent inorganic layers. However, it is preferable that the 1st transparent inorganic layer 64 is comprised only by the transparent inorganic layer A (64a), the intermediate | middle division | segmentation layer 64m, and the transparent inorganic layer B (64b) from a viewpoint of obtaining a desired effect more reliably.

The first transparent inorganic layer preferably contains at least one of ZnO and CeO _2. In particular, as will be apparent from the following description, 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” includes ZnO doped with aluminum (Al) and ZnO doped with other elements.
In this specification, “CeO ₂ ” refers to CeO ₂ doped with gadolinium (Gd) (sometimes collectively referred to as CeGdO ₂ ) (such as Ce _0.9 Gd _0.1 O ₂ ), samarium ( sm) has been _CeO 2 (sometimes referred to collectively as CeSmO ₂ doped with), and other elements (e.g., Zr, is intended to include CeO ₂ doped with Y, etc.).

The first transparent inorganic layer preferably has a total thickness of 100 nm or more, and 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 productivity is reduced and the risk of cracking is suppressed. be able to. 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, although the 1st transparent inorganic layer in the optical body which concerns on this embodiment has a multilayer structure as above-mentioned, it is excellent in ultraviolet-ray resistance rather than the case where it is a single layer. Therefore, it is possible to reduce the thickness of the first transparent inorganic layer, and thus the thickness of the optical body, as compared with the conventional one while maintaining good UV resistance.

  As shown in FIG. 2, the first transparent inorganic layer 64 (the transparent inorganic layer A (64a), the intermediate divided layer 64m, and the transparent inorganic layer B (64b)) is a base from the viewpoint of effectively improving the antiglare property. It is preferable to have a fine uneven surface together with the layer 63. Such a 1st transparent inorganic layer can be formed by laminating | stacking a predetermined component by a sputtering method, a vacuum evaporation method, or CVD method on the base layer which has a fine uneven | corrugated surface, for example.

The first transparent inorganic layer preferably has a light transmittance of 320% at a wavelength of 320% or less, more preferably 3% or less. When the transmittance of light having a wavelength of 320 nm of the first transparent inorganic layer is 6% or less, deterioration such as yellowing of the base material due to ultraviolet rays can be effectively suppressed.
In addition, the transmittance | permeability of the light with a wavelength of 320 nm of a 1st transparent inorganic layer can be measured using JASCO Corporation "V-560", for example. Moreover, the adjustment of the transmittance of light having a wavelength of 320 nm of the first transparent inorganic layer can be performed, for example, by adjusting the main components and thicknesses of the transparent inorganic layer A, the intermediate divided layer, and the transparent inorganic layer B, respectively. it can.

-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 to 4.8 eV. Here, the band gap represents the wavelength of the absorption edge, and broadly indicates that light below the wavelength corresponding to the band gap is absorbed and light having a wavelength equal to or greater than the wavelength corresponding to the band gap is transmitted. The band gap of 2.8 eV or more and 4.8 eV or less is obtained using the Planck constant (6.626 × 10 ⁻³⁴ J · s) and the speed of light (2.998 × 10 ⁸ m / s). From the relational expression between the wavelength λ and the band gap energy E: “λ (nm) = 1240 / E (eV)”, the absorption edge is approximately within the range of 260 nm to 440 nm, which is the boundary between the ultraviolet region and the visible region. It shows that there is a wavelength. Therefore, by using the inorganic compound described above for the transparent inorganic layer A, both transparency and ultraviolet absorption characteristics can be achieved. 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 terms of wavelength). In view of reducing the thickness and reducing the risk of occurrence of cracks, the main component of the transparent inorganic layer A is 3.0 eV or more and 3.4 eV or less (approximately 360 nm or more and 420 nm in terms of wavelength). More preferably, the inorganic compound has a band gap of
In the present specification, the “main component” refers to a component having the largest content.

Specific examples of the inorganic compound having a band gap of 2.8 eV to 4.8 eV are ZnO, CeO ₂ , TiO ₂ , SnO ₂ , In ₂ O ₃ , Nb ₂ O ₅ , Ta ₂ O ₅ , SiC, ZnS, etc. are mentioned. Specific examples of inorganic compounds having a band gap of 3.0 eV to 3.7 eV include ZnO, CeO ₂ , TiO ₂ , Nb ₂ O ₅ , SiC, ZnS, and the like. Furthermore, specific examples of inorganic compounds having a band gap of 3.0 eV or more and 3.4 eV or less include ZnO, CeO _{2 and the} like. In view of the foregoing, a transparent inorganic layer A preferably contains either at least ZnO and CeO _2, and more preferably containing ZnO and CeO _2, more preferably consisting of only ZnO and CeO ₂ .
These inorganic compounds may be used alone for the transparent inorganic layer A, or two or more kinds may be used in combination for the transparent inorganic layer A.
In the present specification, “consisting only of” means that the component is substantially composed only of the component, and specifically, the component occupies 99.9% by mass or more.

-Intermediate division layer-
The intermediate divided layer is a layer that can be arranged between the transparent inorganic layer A and the transparent inorganic layer B, thereby improving the ultraviolet resistance of the optical body and adjusting the color of the reflected light.

The main component of the intermediate division layer, a transparent inorganic layer A preferably has a lower refractive index than the main component of the principal component and the transparent inorganic layer B, is not particularly _limited, SiO 2, SiN, SiON, such as MgF ₂ An inorganic compound is mentioned. In other words, the intermediate divided layer can contain at least one of SiO ₂ , SiN, SiON, and MgF ₂ . The intermediate split layer preferably contains at least SiO _2, and more preferably made of only SiO _2.
These inorganic compounds may be used alone for the intermediate divided layer, or two or more kinds may be used in combination for the intermediate divided layer.

  The intermediate divided layer preferably has a thickness of 30 nm or more, and preferably 60 nm or less. When the thickness of the intermediate dividing layer is 30 nm or more, the light transmittance in the optical body, particularly the light transmittance of a wavelength of 320 nm can be effectively reduced, and the ultraviolet resistance can be significantly increased. Moreover, it can suppress that the high ultraviolet-ray absorption characteristic resulting from the transparent inorganic layer A and the transparent inorganic layer B deteriorates because the thickness of an intermediate division layer is 60 nm or less.

  The ratio of the thickness of the intermediate divided layer in the total thickness of the first transparent inorganic layer is preferably 20% or more, and preferably 40% or less. When the above ratio is 20% or more, the light transmittance in the optical body, in particular, the light transmittance at a wavelength of 320 nm can be reduced, and the ultraviolet resistance can be significantly increased. Moreover, it can suppress that the high ultraviolet-ray absorption characteristic resulting from the transparent inorganic layer A and the transparent inorganic layer B deteriorates because said ratio is 40% or less.

-Transparent inorganic layer B-
The preferred main component of the transparent inorganic layer B is the same as that already described for the transparent inorganic layer A. Specifically, the transparent inorganic layer B preferably contains at least one of ZnO and CeO _2, and more preferably contains 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.

  Moreover, it is preferable that the ratio of the thickness of the transparent inorganic layer B in the total thickness of a 1st transparent inorganic layer is 30% or less. When the above ratio is 30% or less, the a * b * color system and the a * value in the a * b * color system are closer to zero while maintaining good UV resistance, and from various angles. The color of the reflected light with respect to light incidence can be made more neutral. From the same viewpoint, the ratio of the thickness of the transparent inorganic layer B to the total thickness of the first transparent inorganic layer is more preferably 20% or less, and still more preferably 10% or less.

  Moreover, it is preferable that 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 30% or less. When the above ratio is 30% or less, the numerical value of a * and the value of b * in the a * b * color system are closer to zero while maintaining good UV resistance, and from various angles. The color of the reflected light with respect to light incidence can be made more neutral. From the same viewpoint, the ratio of the thickness of the transparent inorganic layer B to the total thickness of the first transparent inorganic layer is more preferably 20% or less, and still more preferably 10% or less.

<Second transparent inorganic layer>
The optical body according to this embodiment includes a second transparent inorganic layer. The second transparent inorganic layer has transparency and can have a function of preventing adhesion of dirt due to rain or the like to the first transparent inorganic layer and a function of adjusting the color of 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 is formed by, for example, a sputtering method, a vacuum evaporation method, or a CVD method. be able to.

The main component of the second transparent inorganic layer preferably has a band gap larger than the band gap of the main component of the first transparent inorganic layer, and more specifically, from the band gap of the main component of the first transparent inorganic layer. Is preferably an inorganic compound having a band gap larger than 4.0 eV. The bandgap of the main component of the second transparent inorganic layer is larger than the bandgap of the main component of the first transparent inorganic layer, preferably 4.0 eV or more, thereby improving the antifouling property of the first transparent inorganic layer. In addition, the antiglare property of the obtained optical body can be improved. Moreover, as a main component of a 2nd transparent inorganic layer, a thing with a refractive index lower than the main component of the transparent inorganic layer A and the main component of the transparent inorganic layer B is preferable.
Specifically, preferred main components of the 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 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 two or more kinds may be used in combination in the second transparent inorganic layer.

  The second transparent inorganic layer preferably has a thickness of 20 nm or more, and 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 antiglare property can be improved more effectively. 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, it is preferable that the 2nd transparent inorganic layer 65 has a fine uneven | corrugated surface with the base layer 63 and the 1st transparent inorganic layer 64 from a viewpoint of improving anti-glare property effectively. Such a second transparent inorganic layer is formed by, for example, laminating a first transparent inorganic layer on a base layer having a fine concavo-convex surface by sputtering, vacuum vapor deposition or CVD, and then sputtering, vacuum vapor deposition or CVD. It can be formed by laminating predetermined components by the method.

<Third transparent inorganic layer>
As shown in FIG. 4, the optical body according to the present embodiment further includes a third transparent inorganic layer 66 on the second transparent inorganic layer 65 in addition to the first transparent inorganic layer 64 and the second transparent inorganic layer 65. It is preferable to provide. By providing the third transparent inorganic layer, it is possible to prevent adhesion of dirt due to rain or the like to the second transparent inorganic layer. This third transparent inorganic layer has transparency, may be water-repellent or hydrophilic, and can be formed by, for example, sputtering, vacuum deposition, or CVD.

The third transparent inorganic layer can contain SiO ₂ as a main component. The third transparent inorganic layer preferably further contains ZrO _2. By the third transparent inorganic layer containing ZrO ₂ with SiO _2, improved alkali resistance of the optical body, for example, environment or that may be exposed to chemicals, harsh outdoor environment (acid rain, eluted from the concrete It can be suitably used for window glass provided in calcium hydroxide, salt water, water + sunlight, etc.).

The proportion of ZrO ₂ in the third transparent inorganic layer is preferably 6% by mass or more and 50% by mass or less. When the ratio of ZrO ₂ is 6% by mass or more, chemical resistance, particularly alkali resistance improvement effect can be sufficiently obtained, and when it is 50% by mass or less, It is possible to keep the refractive index difference moderate and avoid the difficulty in optical design. From the same viewpoint, the ratio of ZrO ₂ in the third transparent inorganic layer is more preferably 13% by mass or more, further preferably 20% by mass or more, and more preferably 40% by mass or less. preferable.

  The third transparent inorganic layer preferably has a thickness of 20 nm or more. When the thickness of the third transparent inorganic layer is 20 nm or more, sufficiently higher chemical resistance can be obtained. The third transparent inorganic layer preferably has a thickness of 200 nm or less. When the thickness of the third transparent inorganic layer is 200 nm or less, it is possible to suppress the productivity reduction and the risk of cracking. From the same viewpoint, the thickness of the third transparent inorganic layer is more preferably 100 nm or less.

<Adhesion layer>
As shown in FIG. 5, the optical body according to the present embodiment preferably further includes an adhesion layer 67 between the above-described base layer 63 and the first transparent inorganic layer 64 in order to firmly adhere. Examples of the adhesion layer include a SiO _x layer, and the thickness can be set to, for example, 2 nm or more and 10 nm or less, from the viewpoint of avoiding the influence of coloring and from the viewpoint of exhibiting the function with a minimum necessary material. , 8 nm or less is preferable, and 5 nm or less is more preferable. This adhesion layer can be formed by, for example, sputtering, vacuum deposition, or CVD. In particular, when a SiO _x layer is formed using a sputtering method, a silicon target can be used to form a film in an oxygen-deficient state.

<Anti-fouling coating layer>
The optical body according to the present embodiment preferably includes an antifouling coating layer on the outermost surface on the second transparent inorganic layer. Specifically, the optical body according to this embodiment preferably includes an antifouling coating layer on the second transparent inorganic layer or the third transparent inorganic layer. By providing an antifouling coating layer, it is possible to reduce the adhesion of dirt to the optical body, and the attached dirt can be easily removed, so that the optical body exhibits the expected performance for a longer period of time. Can do.
Incidentally, antifouling coat layer, the high adhesiveness viewpoint, it is preferably provided on the second transparent inorganic layer or the third transparent inorganic layer mainly comprising SiO _2.

  The main component of the antifouling coating layer may be water-repellent or hydrophilic, and may be oil-repellent or oleophilic. However, from the viewpoint of more effectively increasing the antifouling property, the main component of the antifouling coating layer is preferably water-repellent and oil-repellent. Specifically, regarding the water repellency, the antifouling coating layer preferably has a pure water contact angle of 110 ° or more, and more preferably 115 ° or more. As those having these properties, the main component of the antifouling coating layer is preferably perfluoropolyether.

  The antifouling coating layer preferably has a thickness of 5 nm or more, and preferably 20 nm or less, for example 10 nm. When the thickness of the antifouling coating layer is 5 nm or more, the antifouling property of the optical body can be sufficiently enhanced, and when it is 20 nm or less, avoiding the burying of an arbitrarily existing fine uneven structure. Can do.

<Other layers>
The optical body according to the present embodiment is not particularly limited, and may include other layers other than the layers described above.

For example, the optical body according to the present embodiment preferably 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. By providing an adhesive layer that absorbs visible light on the surface opposite to the surface on which the first transparent inorganic layer is disposed, a glass substrate is provided on the surface including the adhesive layer 84 of the optical body as shown in FIG. 81, the visible light that passes through the second transparent inorganic layer 65, the first transparent inorganic layer 64, and the fine uneven layer 63 and enters the adhesive layer 84, and the second transparent inorganic layer 65, After passing through the first transparent inorganic layer 64, the fine concavo-convex layer 63 and the adhesive layer 84, the visible light reflected by the glass substrate 81 and incident on the adhesive layer 84 is efficiently absorbed to reduce the visible light transmittance, The antiglare property can be further improved. In addition, the use of adhesive layers having different visible light absorptivity has the advantage that product lineups having different glossiness can be easily arranged.
The adhesive layer that absorbs visible light can be prepared, for example, by using a material having adhesive properties in which a colorant such as a dye or pigment that absorbs visible light is dispersed in an arbitrary ratio. .
On the other hand, for example, when there is a large proportion of a dye or pigment that absorbs visible light and there is a problem such as a decrease in adhesive strength or deterioration in durability, a coloring agent such as a dye or pigment is included. A base material that absorbs visible light or an inorganic film that absorbs visible light such as DLC may be laminated on the base layer.

<Characteristics of optical body>
In the optical body according to this embodiment, the transmittance of light having a wavelength of 320 nm is preferably 10% or less, more preferably 6% or less, and further preferably 3% or less. When the transmittance of the optical body with a wavelength of 320 nm is 10% or less, it is possible to effectively suppress deterioration such as yellowing of the base material due to ultraviolet rays, and durability of adhesion between the base material and the resin layer. Can be improved.
In addition, the transmittance | permeability of the light with a wavelength of 320 nm of an optical body can be measured using "V-560" by JASCO Corporation, for example.

(Window material)
A window material according to an embodiment of the present invention (hereinafter sometimes referred to as “window material according to the present embodiment”) includes a glass substrate and the optical body described above. Specifically, as shown in FIG. 7, the window member 80 according to the present embodiment is a surface on which the optical body 60 and the glass substrate 81 described above are not disposed on the first transparent inorganic layer 64 of the optical body 60. Can be laminated so as to face the glass substrate 81. As described above, the window material according to the present embodiment includes at least the above-described optical body, has excellent ultraviolet resistance, and the color of reflected light and changes thereof are reduced. As window glass for vehicles, window glass for vehicles, etc., it can use suitably.
In addition, the window material which concerns on this embodiment may be equipped with the optical body mentioned above only in the single side | surface of a glass substrate, and may be provided in both surfaces.

The window material according to the present embodiment may be a multilayer glass. Here, as shown in FIG. 8, the multi-layer glass is usually formed by laminating a plurality of glass substrates (82, 83) with a spacer 85 at the periphery, and a space is formed between the glass substrates. Refers to glass having a structure.
And the window material 80 which concerns on this embodiment which is a multilayer glass, as shown to (a) of FIG. 8, is an outdoor side of the glass substrate 82 used as the outdoor side when installing in a building etc. as a window glass. The optical body 60 may be provided only on the surface, and as shown in FIGS. 8B to 8D, the optical body 60 is provided on the surface on the outdoor side of the glass substrate 82 that is the outdoor side. At the same time, the optical body 60 may be provided on one side and / or both sides of the glass substrate 83 on the indoor side, and further, the glass on the outdoor side as shown in FIGS. The optical body is provided on both surfaces of the substrate 82, and optionally, the optical body 60 may be provided on one surface and / or both surfaces of the glass substrate 83 on the indoor side.

  In addition, when the window material according to the present embodiment is a multi-layer glass, and an optical body is provided on the surface on the outdoor side of the glass substrate that becomes the outdoor side when installed in a building or the like as a window glass. Is an adhesive layer that absorbs visible light on the surface opposite to the surface on which the first transparent inorganic layer of the optical body is disposed (more specifically, between the optical body and the glass substrate). It is particularly preferred to provide. By providing such a pressure-sensitive adhesive layer that absorbs visible light, the visible light that passes through the optical body and enters the pressure-sensitive adhesive layer, passes through the optical body and the pressure-sensitive adhesive layer, and then on the indoor side surface of the glass substrate on the outdoor side. Visible light reflected and incident on the adhesive layer, and after passing through the optical body, the adhesive layer, and the outdoor glass substrate, reflected by the indoor glass substrate, and transmitted through the outdoor glass substrate to the adhesive layer By efficiently absorbing incident visible light and the like, the visible light transmittance is reduced, and the problem of anti-glare that the multi-layer glass can frequently face can be solved while maintaining high viewability.

  Next, the present invention will be described more specifically with reference to examples. However, 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 A resin layer having a fine irregular surface on a PET substrate (Toyobo Co., Ltd., “A4300”, thickness 75 μm) A base layer was obtained by forming a composition using an acrylic ultraviolet curable resin by a shape transfer method. Next, a first transparent inorganic layer (single layer) made of ZnO and CeO ₂ (ZnO: CeO 2 = 30: 70 (mass ratio)) is laminated on the fine uneven surface of the resin layer in the base layer by sputtering, on the surface of the first transparent inorganic layer, a second transparent inorganic layer containing SiO ₂ stacked by sputtering to obtain an optical member.
Here, for the plurality of optical bodies obtained by variously changing the thickness of the first transparent inorganic layer (single layer), “V-560” manufactured by JASCO Corporation was used in accordance with JIS A 5759, The transmittance of light having a wavelength of 320 nm was measured. FIG. 9 shows the relationship between the thickness of the first transparent inorganic layer (single layer) and the transmittance of light having a wavelength of 320 nm.
From FIG. 9, it can be seen that as the thickness of the first transparent inorganic layer (single layer) increases, the transmittance of light having a wavelength of 320 nm decreases and the ultraviolet resistance tends to increase. 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 more preferably about 2% or less.

(2) Relationship between the thickness of the intermediate divided layer in the first transparent inorganic layer and the transmittance of light having a wavelength of 320 nm Fine unevenness on a PET substrate (Toyobo Co., Ltd., “A4300”, thickness 75 μm) A resin layer having a surface was formed by a shape transfer method using a composition containing an acrylic ultraviolet curable resin to obtain a base layer. Next, a transparent inorganic layer B made of ZnO and CeO ₂ (ZnO: CeO 2 = 30: 70 (mass ratio)) is laminated on the fine uneven surface of the resin layer in the base layer by a sputtering method, and this transparent inorganic layer B An intermediate divided layer made of only SiO ₂ is laminated on the surface of the intermediate divided layer by a sputtering method, and a transparent inorganic layer A having the same composition as the transparent inorganic layer B is laminated on the surface of the intermediate divided layer by a sputtering method. on the surface of the transparent inorganic layer a, a second transparent inorganic layer containing SiO ₂ stacked by sputtering to obtain an optical member.
Here, the total thickness of the first transparent inorganic layer is 150 nm or 170 nm, the thickness of the transparent inorganic layer A and the thickness of the transparent inorganic layer B are the same, and the thickness of the intermediate divided layer is variously changed. Further, the transmittance of light having a wavelength of 320 nm was measured for each of the plurality of optical bodies in the same manner as described above. FIG. 10 shows the relationship between the thickness of the intermediate divided layer and the transmittance of light having a wavelength of 320 nm.
From FIG. 10, it can be seen that by providing the intermediate division layer (thickness is more than 0), the transmittance of light having a wavelength of 320 nm is lowered and the ultraviolet resistance tends to be increased. In particular, it can be seen that when the thickness of the intermediate divided layer is 40 nm to 60 nm, the transmittance tends to decrease and the ultraviolet resistance tends to be higher.

(3) Relationship between the ratio of the thickness of the transparent inorganic layer B and the transmittance of light having a wavelength of 320 nm In the same manner as in the above (2), an optical body was obtained. Here, the total thickness of the first transparent inorganic layer is 150 nm, the laminated thickness of the intermediate divided layer is 10 nm, and the plurality of optical bodies obtained by variously changing the laminated thickness of the transparent inorganic layer B, The transmittance of light having a wavelength of 320 nm was measured in the same manner as described above. FIG. 11 shows the relationship between the thickness of the transparent inorganic layer B and the transmittance of light having a wavelength of 320 nm.
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 transmittance of light with a wavelength of 320 nm is within the range of 0.6% to 0.8%. It can be seen that the UV resistance is not greatly affected.

(4) Relationship between the thickness of the transparent inorganic layer B and the a * and b * of the reflected light An optical body was obtained in the same manner as in (2) above. Here, the total thickness of the first transparent inorganic layer is 150 nm, the laminated thickness of the intermediate divided layer is 10 nm, and the plurality of optical bodies obtained by variously changing the laminated thickness of the transparent inorganic layer B, Based on the CIELAB color space, a * and b * of reflected light with respect to 5 ° or 60 ° light incidence were calculated from reflection spectrophotometric data measured in the wavelength range from 300 nm to 800 nm using a spectrophotometer. The relationship between the thickness of the transparent inorganic layer B and a * and b * is shown in FIG.
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 * of the reflected light with respect to incident light of at least 60 ° change around zero. I understand that. In particular, when the ratio of the thickness of the transparent inorganic layer B to the total thickness of the first transparent inorganic layer is 30% or less, the values of a * and b * of reflected light with respect to light incident at 5 ° and 60 ° are zero. You can see that it is closer.

  According to the present invention, an optical body excellent in ultraviolet resistance, the color of reflected light and its change is reduced, and a window material excellent in ultraviolet resistance and the color of reflected light and its change are reduced. Can be provided.

DESCRIPTION OF SYMBOLS 1 Shape transfer apparatus 2 Master 23 Fine uneven structure 51 Base material supply roll 52 Winding roll 53, 54 Guide roll 55 Nip roll 56 Peeling roll 57 Coating device 58 Light source 60 Optical body 61 Base material 62 Resin layer 63 Base layer 64 1st transparent Inorganic layer 64a Transparent inorganic layer A
64m Intermediate split layer 64b Transparent inorganic layer B
65 Second transparent inorganic layer 66 Third transparent inorganic layer 67 Adhesion layer 80 Window material 81, 82, 83 Glass substrate 84 Adhesive layer 85 Spacer

Claims (8)

An optical body comprising a base layer, a first transparent inorganic layer, and a second transparent inorganic layer,
The first transparent inorganic layer comprises a transparent inorganic layer A, a transparent inorganic layer B, and an 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 so that the transparent inorganic layer B is on the base layer side,
The second transparent inorganic layer is disposed on the first transparent inorganic layer.
An optical body characterized by that. The first transparent inorganic layer contains at least one of ZnO and CeO ₂ ;
The optical body according to claim 1, wherein the second transparent inorganic layer contains at least one of SiO ₂ , SiN, SiON, and MgF ₂ . The optical body according to claim 1, wherein the intermediate division layer is made of only SiO ₂ .   The optical body in any one of Claims 1-3 whose ratio of the thickness of the said transparent inorganic layer B in the total thickness of a said 1st transparent inorganic layer is 30% or less.   The optical body according to claim 1, further comprising an adhesion layer between the base layer and the first transparent inorganic layer.   The optical body according to claim 1, 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 intermediate divided layer has a thickness of 30 nm to 60 nm.   A window material comprising a glass substrate and the optical body according to claim 1.

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