WO2019065009A1 - Optical body and window material - Google Patents

Optical body and window material Download PDF

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Publication number
WO2019065009A1
WO2019065009A1 PCT/JP2018/031022 JP2018031022W WO2019065009A1 WO 2019065009 A1 WO2019065009 A1 WO 2019065009A1 JP 2018031022 W JP2018031022 W JP 2018031022W WO 2019065009 A1 WO2019065009 A1 WO 2019065009A1
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Prior art keywords
optical body
layer
transparent inorganic
inorganic layer
less
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PCT/JP2018/031022
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French (fr)
Japanese (ja)
Inventor
和田　豊
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デクセリアルズ株式会社
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Publication of WO2019065009A1 publication Critical patent/WO2019065009A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00—Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/70—Door leaves
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements

Definitions

  • the present invention relates to an optical body and a window material, and more specifically, to an optical body having high antiglare property and viewability at the same time, and a window material provided with the same.
  • louvers As a measure against glare of the reflected light from the window glass of the building, for example, there is a method in which a louver or the like is installed on the wall of the building to directly block the reflected light.
  • the installation of louvers is a large-scale work, is expensive, and affects the design of a building, so it is often the case that the owner hurts.
  • Patent Document 1 uses an ultraviolet curing resin on a base film to form an AG (antiglare) layer having a random uneven shape surface, and the unevenness By forming a layer made of a low refractive index resin so as to flatten the shape, an optical film which can make black stand out when attached to a display while flatting the reflectance in the visible light region is obtained. Is disclosed.
  • Patent Document 2 uses a mold surface which is made to strike blast particles of a predetermined particle size when transfer molding of irregularities on a mold surface using a UV curable resin on a base film to obtain a film. It is disclosed that a film with reduced glare can be obtained while maintaining high transmission sharpness.
  • An object of the present invention is to solve the above-mentioned problems in the prior art and to achieve the following objects. That is, an object of the present invention is to provide an optical body excellent in antiglare property and viewability, and a window material excellent in antiglare property and viewability.
  • the present inventors diligently studied without limiting to a film. As a result, it has been found that high antiglare properties and viewability can be achieved at the same time by optimizing the characteristics of the surface roughness of the fine uneven surface, and the present invention has been completed.
  • the present invention is based on the findings by the present inventors, and means for solving the problems are as follows. That is, ⁇ 1> It is an optical body provided with a fine concavo-convex layer, In the 35.3 ⁇ m ⁇ 26.5 ⁇ m rectangular area of the fine uneven surface, Arithmetic mean roughness Ra is 0.2 ⁇ m or less, and The average length RSm of the roughness curvilinear element is 10 ⁇ m or less, or the ratio of the surface area to the area of the rectangle is 1.04 or more and 1.5 or less. It is an optical body characterized by
  • a first transparent inorganic layer and a second transparent inorganic layer are further provided, The optical body according to ⁇ 1>, wherein the first transparent inorganic layer is disposed on the fine asperity surface of the fine asperity layer, and the second transparent inorganic layer is disposed on the first transparent inorganic layer is there.
  • the first transparent inorganic layer contains at least one of ZnO and CeO 2
  • the total haze is 15% or more and 60% or less, the internal haze is 4% or less, the glossiness at a measurement angle of 20 ° is 40 or less, and the transmitted image definition at an optical comb width of 2 mm is 50 It is an optical body according to any one of the above ⁇ 1> to ⁇ 3>, which is% or more.
  • ⁇ 5> The optical body according to any one of ⁇ 2> to ⁇ 4>, further including a third transparent inorganic layer on the second transparent inorganic layer.
  • a window material comprising: a glass substrate; and the optical body according to any one of ⁇ 1> to ⁇ 5>.
  • the above-mentioned various problems in the prior art can be solved, and the above object can be achieved, and an optical body excellent in antiglare property and viewability, and a window material excellent in antiglare property and viewability be able to.
  • an optical body 60 As shown in FIG. 1, an optical body (hereinafter sometimes referred to as “optical body according to the present embodiment”) 60 according to an embodiment of the present invention includes at least a fine uneven layer 63. Moreover, the optical body which concerns on this embodiment can be further equipped with a 1st transparent inorganic layer, a 2nd transparent inorganic layer, a 3rd transparent inorganic layer, an antifouling coating layer, another layer, etc. as needed.
  • the fine uneven layer is a layer having a fine uneven structure on at least one surface.
  • the uneven structure may be formed in a regular pattern or may be formed randomly.
  • the fine uneven surface in the fine uneven layer has an arithmetic average roughness Ra of 0.2 ⁇ m or less in a rectangular region of 35.3 ⁇ m ⁇ 26.5 ⁇ m.
  • ratio of surface area to .45 ⁇ m 2) ( ⁇ m 2) (hereinafter sometimes referred to as "specific surface area”.) is 1.04 to 1.5.
  • the present inventors surprisingly set the average length RSm and / or the specific surface area of the roughness curvilinear element within the above-mentioned range, while making the arithmetic average roughness Ra of the micro uneven surface 0.2 ⁇ m or less.
  • unevenness having a shape smaller than the wavelength of the visible light region can be formed, and a part of the light can be transmitted without changing the traveling direction, and the transmitted image definition can be enhanced. It has been found that an optical body compatible with is obtained.
  • the fine asperity surface in the fine asperity layer has an average length RSm of the roughness curvilinear element of 10 ⁇ m or less and a specific surface area of 1.04 to 1.5. It is preferable that it is the following.
  • Arithmetic mean roughness Ra of the fine asperity surface in the fine asperity layer is preferably 0.18 ⁇ m or less, more preferably 0.14 ⁇ m or less from the viewpoint of achieving both higher antiglare property and viewability. preferable.
  • the arithmetic average roughness Ra of the fine asperity surface in the fine asperity layer is preferably 0.08 ⁇ m or more, and more preferably 0.09 ⁇ m or more, from the viewpoint of further enhancing the antiglare property.
  • the average length RSm of the surface roughness curvilinear element of the surface with fine asperities in the surface asperity layer is preferably 6 ⁇ m or less from the viewpoint of further enhancing the clearness of the transmitted image.
  • the average length RSm of the surface roughness curvilinear element of the surface asperity in the surface asperity layer is 2 ⁇ m or more from the viewpoint of achieving both higher antiglare property and viewability, and from the viewpoint of enhancing the physical strength of the surface asperity. Is preferred.
  • the specific surface area of the fine asperity surface in the fine asperity layer is preferably 1.1 or more from the viewpoint of further enhancing the antiglare property. Moreover, it is preferable that the specific surface area of the fine uneven
  • the fine uneven layer can be formed by, for example, a shape transfer method, a phase separation method, a filler dispersion method, or the like.
  • a method of forming a fine uneven layer by a shape transfer method will be described with reference to FIG.
  • FIG. 2 is a schematic diagram which shows the shape transfer method which is an example of the method for forming the fine concavo-convex layer of the optical body which concerns on this embodiment.
  • the shape transfer device 1 shown in FIG. 2 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 device 57, and a light source. And 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 role.
  • the guide rolls 53 and 54 are rolls for transporting the base 61.
  • the nip roll 55 is a roll for closely adhering the base material 61 on which the resin layer 62 is laminated to the cylindrical master 2
  • the peeling roll 56 is a resin layer after the fine concavo-convex structure 23 is transferred to the resin layer 62.
  • 62 is a roll for peeling the base material 61 on which the 62 is laminated from the master 2.
  • the substrate 61 may be, for example, a plastic substrate such as a PET resin or a polycarbonate resin, and may be a plastic transparent film.
  • the coating device 57 includes a coating unit such as a coater, and applies a composition (a UV curable resin composition) containing a UV curable resin 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.
  • An ultraviolet curable resin is a resin which is reduced in fluidity by being irradiated with ultraviolet light and is cured. 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, etc. as needed.
  • the sheet-like base material 61 is continuously delivered from the base material supply roll 51 via the guide roll 53.
  • the ultraviolet curable resin composition is applied to the base material 61 that has been sent out by the coating device 57, and the resin layer 62 is laminated on the base material 61.
  • the base 61 on which the resin layer 62 is laminated is in close contact with the master 2 by the nip roll 55.
  • the fine concavo-convex structure 23 formed on the outer peripheral surface of the master 2 is transferred to the resin layer 62.
  • the resin layer 62 is cured by the irradiation of light from the light source 58.
  • 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.
  • a shape transfer device 1 it is possible to continuously form a fine uneven layer having a fine uneven surface.
  • Ra, RSm, and the specific surface area of the fine uneven surface can be adjusted, for example, by appropriately changing the fine uneven structure 23 of the master 2.
  • the base material and the ultraviolet curable resin are prepared, and the fine asperity layer is formed on the base material using the resin (that is, as shown in FIG. 1, the fine asperity layer)
  • the layer 63 is composed of the base material 61 and the resin layer 62 having a fine concavo-convex structure
  • the fine concavo-convex layer of the optical body of the present invention is not limited thereto.
  • UV curable resin or thermosetting resin The fine uneven structure may be directly formed on a base material made of a resin such as (that is, as shown in FIG. 3, the fine uneven layer 63 may be formed of only the base material 61).
  • the optical body 60 preferably includes the first transparent inorganic layer 64 on the surface of the fine asperity layer 63.
  • the first transparent inorganic layer 64 has transparency and can have a function of absorbing light of a predetermined wavelength, for example.
  • the first transparent inorganic layer 64 can be formed by, for example, a sputtering method or a CVD method.
  • “transparent” or “having transparency” means that the transmitted image definition is high and the image can be clearly viewed through the optical body.
  • the main component of the first transparent inorganic layer is preferably an inorganic compound having a band gap of 2.8 eV or more and 4.8 eV or less.
  • the band gap represents the wavelength of the absorption edge, and in a broad sense, it indicates that the light below the wavelength corresponding to the band gap is absorbed, and the light above the wavelength corresponding to the band gap is transmitted.
  • the main component of the first transparent inorganic layer 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).
  • the main component of the first transparent inorganic layer is 3.0 eV or more and 3.4 eV or less (approximately 360 nm or more in wavelength conversion) It is more preferable that it is an inorganic compound having a band gap of 420 nm or less.
  • a "main component" shall refer to the component with most content.
  • the inorganic compound having a band gap of 2.8 eV or more and 4.8 eV or less include ZnO, CeO 2 , TiO 2 , SnO 2 , In 2 O 3 , Nb 2 O 5 , and Ta 2 O 5 . SiC, ZnS and the like can be mentioned. Further, specific 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. Further, specific examples of the inorganic compound having a band gap of 3.0 eV or more and 3.4 eV or less include ZnO, CeO 2 and the like.
  • the first transparent inorganic layer preferably contains at least one of ZnO and CeO 2 .
  • ZnO includes ZnO doped with aluminum (Al) and ZnO doped with other elements.
  • CeO 2 is doped with gadolinium (Gd) -doped CeO 2 (sometimes collectively referred to as “CeGdO 2” ) (eg, Ce 0.9 Gd 0.1 O 2 ), samarium (Sm) It has been CeO 2, and is intended to include CeO 2 doped with other elements.
  • the thickness of the first transparent inorganic layer is preferably 70 nm or more, and preferably 400 nm or less.
  • the thickness of the first transparent inorganic layer is 70 nm or more, sufficiently high ultraviolet light absorption characteristics can be obtained, and when it is 400 nm or less, the risk of productivity decrease and crack generation can be suppressed. it can.
  • the thickness of the first transparent inorganic layer is more preferably 100 nm or more, and more preferably 300 nm or less.
  • the optical body 60 in addition to the first transparent inorganic layer 64, preferably includes a second transparent inorganic layer 65 on the first transparent inorganic layer 64. .
  • the second transparent inorganic layer has transparency, may be water-repellent or hydrophilic, and can be formed by, for example, a sputtering method or a CVD method.
  • 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, the band gap of the main component of the first transparent inorganic layer Is preferably an inorganic compound having a large band gap of 4.0 eV or more.
  • 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, preferably 4.0 eV or more, the stain resistance of the first transparent inorganic layer is improved.
  • the antiglare property of the obtained optical body can be improved.
  • 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 .
  • the thickness of the second transparent inorganic layer is preferably 20 nm or more, and preferably 200 nm or less.
  • 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 more effectively improved.
  • the thickness of the second transparent inorganic layer is more preferably 40 nm or more, and more preferably 100 nm or less.
  • the optical body according to the present embodiment has a third transparent inorganic layer 66 on the second transparent inorganic layer 65. It is preferable to further comprise By providing the third transparent inorganic layer, the deterioration of the first transparent inorganic layer and the second transparent inorganic layer due to chemicals can be suppressed.
  • the third transparent inorganic layer has transparency, may be water-repellent or hydrophilic, and can be formed by, for example, a sputtering method or a CVD method.
  • the third transparent inorganic layer can contain at least one of SiO 2 , SiN, SiON and MgF 2 as a main component.
  • the third transparent inorganic layer preferably further contains ZrO 2 , Nb 2 O 5 or SnO 2 as an additional component.
  • the ratio of the said additional component in a 3rd transparent inorganic layer is 6 to 50 mass%.
  • the proportion of the additional component is 6% by mass or more, the effect of improving the chemical resistance can be sufficiently obtained, and by being 50% by mass or less, the refractive index with the second transparent inorganic layer It is possible to keep the difference moderate and avoid the difficulty of optical design.
  • the ratio of the additional component in the third transparent inorganic layer is more preferably 13% by mass or more, still more preferably 20% by mass or more, and 30% by mass or less Is more preferred.
  • the additional components may be used alone or in combination of two or more.
  • 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, a sufficiently high 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 risk of productivity decrease and crack generation. From the same viewpoint, the thickness of the third transparent inorganic layer is more preferably 100 nm or less.
  • the optical body which concerns on this embodiment equips the outermost surface by the side of the fine concavo-convex surface of a fine concavo-convex layer with an antifouling coat layer.
  • the optical body according to the present embodiment preferably includes an antifouling coating layer on the fine concavo-convex layer, on the second transparent inorganic layer, or on the third transparent inorganic layer.
  • antifouling coat layer 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- or lipophilic.
  • the main component of the antifouling coating layer is preferably water repellent and oil repellent.
  • the antifouling coating layer preferably has a pure water contact angle of 110 ° or more, and more preferably 115 ° or more.
  • the main component of the antifouling coating layer is preferably a perfluoropolyether.
  • the antifouling coating layer preferably has a thickness of 5 nm or more, and preferably 20 nm or less, for example, 10 nm.
  • 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, the burying of the uneven structure of the fine uneven layer can be avoided. it can.
  • the optical body according to the present embodiment is not particularly limited, and may have other layers in addition to the layers described above.
  • the optical body according to the present embodiment may be provided with an adhesion layer between the fine concavo-convex layer and the first transparent inorganic layer in order to firmly adhere the layer.
  • an adhesion layer for example, a SiO x layer can be mentioned, and the thickness can be, for example, 2 nm or more and 10 nm or less.
  • the adhesion layer can be formed, for example, by sputtering or CVD.
  • the optical body which concerns on this embodiment equips the surface on the opposite side to the fine concavo-convex surface of the fine concavo-convex layer with the adhesion layer which absorbs visible light.
  • Visible light which passes through (the optional first transparent inorganic layer 64 and the fine concavo-convex layer 63 and is incident on the adhesive layer 84, and (the optional first transparent inorganic layer 64), the fine concavo-convex layer 63 and the adhesive layer
  • visible light and the like reflected by the glass substrate 81 and incident on the adhesive layer 84 are efficiently absorbed to reduce the visible light transmittance, and the antiglare property is further improved while maintaining high viewability. can do.
  • the adhesion layer which absorbs visible light can be prepared, for example, using a material having adhesiveness, in which a coloring agent such as a dye or a pigment which absorbs visible light is dispersed at an arbitrary ratio.
  • a coloring agent such as a dye or a pigment which absorbs visible light
  • colorants such as dyes or pigments are contained.
  • a substrate that absorbs visible light or an inorganic film that absorbs visible light, such as DLC, may be stacked on the fine uneven layer.
  • the optical body according to the present embodiment preferably has a glossiness of 40 or less at a measurement angle of 20 °.
  • the glossiness at a measurement angle of 20 ° is 40 or less, the antiglare property of the optical body can be made sufficiently high.
  • the glossiness at a measurement angle of 20 ° of the optical body is more preferably 30 or less, and still more preferably 20 or less.
  • the glossiness in 20 degrees of measurement angles of an optical body can be measured by the method used in the Example.
  • the optical body according to the present embodiment preferably has a transmitted image definition of 50% or more at an optical comb width of 2 mm.
  • the transmitted image definition in an optical comb width of 2 mm is 50% or more, the viewability of the optical body can be made sufficiently high.
  • the transmitted image definition at an optical comb width of 2 mm of the optical body is more preferably 70% or more, and still more preferably 80% or more.
  • the transmitted image clearness in 2 mm of optical comb widths of an optical body can be measured by the method used in the Example.
  • the optical body according to the present embodiment preferably has a total haze of 15% or more and 60% or less.
  • the total haze is 15% or more, the antiglare property can be effectively enhanced, and when the total haze is 60% or less, the viewability can be effectively enhanced.
  • the total haze of the optical body is more preferably 50% or less.
  • the optical body according to the present embodiment preferably has an internal haze of 4% or less. By the internal haze being 4% or less, the view can be further enhanced. From the same viewpoint, the internal haze of the optical body is more preferably 2% or less.
  • the total haze and internal haze of an optical body can be measured by the method used in the Example.
  • the optical body according to the present embodiment preferably has a transmittance of 10% or less, more preferably 6% or less, and still more preferably 3% or less.
  • the transmittance of light with a wavelength of 320 nm of the optical body is 10% or less, deterioration such as yellowing of the base material due to ultraviolet light can be effectively suppressed, and adhesion durability between the base material and the resin layer Can be improved.
  • the transmittance of light of wavelength 320 nm of the optical body can be measured, for example, using “V-560” manufactured by JASCO Corporation.
  • 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 above-described optical body. Specifically, as shown in FIG. 7, the window member 80 according to the present embodiment has the optical body 60 and the glass substrate 81 described above, and the surface on the opposite side to the fine asperity surface of the optical body 60 is a glass substrate It can be made to laminate so that 81 may be faced. As described above, the window material according to the present embodiment includes at least the above-described optical body, and is excellent in both the antiglare property and the viewability, so window glass for buildings such as high-rise buildings and houses, window glass for vehicles, etc. Can be suitably used. In addition, the window material which concerns on this embodiment may be equipped with the optical body mentioned above only on the single side
  • the gloss at a measurement angle of 20 °, the transmitted image sharpness at an optical comb width of 2 mm, the total haze, the internal haze, and the light of wavelength 320 nm in the window material according to this embodiment are respectively the same as those described above for the optical body.
  • the window material according to the present embodiment may be a multilayer glass.
  • double glazing is inferior in anti-glare property to single-layer glass, but the window material according to the present embodiment is highly anti-glare even if it is double glazing because it is provided with the optical body described above. Can bring
  • a plurality of glass substrates (82, 83) are laminated with the spacer 85 at the periphery, and a space is formed between the glass substrates, as shown in FIG. Refers to a glass having a structure.
  • window material 80 concerning this embodiment which is a double glazing is an outdoor side of glass substrate 82 which becomes an outdoor side when installed in a building etc. as window glass.
  • the optical body 60 may be provided only on the surface, and as shown in (b) to (d) of FIG. 8, the optical body 60 is provided on the surface on the outdoor side of the glass substrate 82 serving as the outdoor side.
  • the optical body 60 may be provided on one side and / or both sides of the glass substrate 83 on the indoor side, and as shown in (e) to (h) of FIG.
  • the optical body is provided on both sides of the substrate 82, and optionally, the optical body 60 may be provided on one side and / or both sides of the glass substrate 83 which is the indoor side.
  • the window material which concerns on this embodiment is a multilayer glass
  • an optical body is provided in the surface of the outdoor side of the glass substrate which becomes an outdoor side when it installs in a building etc. as window glass. It is particularly preferable to provide an adhesive layer that absorbs visible light on the surface (more specifically, between the optical body and the glass substrate) of the optical body on the opposite side to the microrelief surface.
  • the visible light that passes through the optical body and enters the adhesive layer passes through the optical body and the adhesive layer, and then on the indoor side surface of the glass substrate on the outdoor side After transmitting through visible light that is reflected and enters the adhesive layer, and through the optical body, the adhesive layer, and the glass substrate on the outdoor side, it is reflected by the glass substrate on the indoor side and transmitted through the glass substrate on the outdoor side to the adhesive layer. It is possible to efficiently absorb incident visible light and the like to reduce the visible light transmittance, and to solve the antiglare problem that double-layered glass can frequently encounter, while maintaining high view.
  • Examples 1 to 5, Comparative Examples 1 to 2 A resin layer having a fine concavo-convex structure is formed on a PET base material (Toyobo Co., Ltd., “A4300”, 75 ⁇ m thick) by a shape transfer method using a composition containing an acrylic UV curable resin And got an optical body.
  • a shape transfer method using a composition containing an acrylic UV curable resin And got an optical body.
  • each parameter (Ra: Arithmetic average roughness ( ⁇ m), RSm: average length of roughness curvilinear element, specific surface area) concerning the surface of the optical body is shown in Table 1
  • the conditions of the shape transfer method were appropriately adjusted such as changing the surface shape of the master so as to obtain the values shown.
  • Specific conditions include software: MtroPro 8.3.5, Acquisition Mode: Scan, Scan Type: Bipolar, zoom lens: 2 ⁇ , objective lens: 200 ⁇ , mode: High 2G, surface correction: Cylinder, Camera Mode: It was set to 640 ⁇ 480 210 Hz.
  • the said measurement was performed in the 35.3 micrometers x 26.5 micrometers rectangular area
  • Transmission image definition T is 70% or more ⁇ Transmission image definition T is 50% or more and less than 70% ⁇ Transmission image definition T is less than 50% ⁇ ⁇
  • Ra is 0.2 ⁇ m or less, and at least one of RSm and the specific surface area is within the predetermined range, so it is possible to achieve both the antiglare property and the viewability. I know that I can do it.
  • an optical body excellent in antiglare property and viewability and a window material excellent in antiglare property and viewability.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Laminated Bodies (AREA)
  • Securing Of Glass Panes Or The Like (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

The present invention provides an optical body with excellent antiglare and viewing quality. The optical body has a fine irregular layer. The arithmetic average roughness Ra is 0.2 µm or less and the average length RSm of a roughness curve element is 10 µm or less in a rectangular region of 35.3 µm × 26.5 µm on the fine irregular surface, or the ratio of a surface area to the rectangular area is between 1.04 and 1.5, inclusive.

Description

光学体、及び窓材Optical body and window material
　本発明は、光学体、及び窓材に関するものであり、より具体的には、高い防眩性と眺望性とが両立した光学体、及び、これを備える窓材に関するものである。 The present invention relates to an optical body and a window material, and more specifically, to an optical body having high antiglare property and viewability at the same time, and a window material provided with the same.
　近年、高層ビルやタワーマンション等を含む建築物においては、搭載される窓ガラス等に光が反射し、他の近隣の建築物の利用者に眩しさをもたらす、いわゆる反射光害が頻繁に問題となっている。そのため、建築物の建設に当たっては、上述した反射光害への十分な対策を講じることが求められている。 In recent years, in buildings including high-rise buildings and tower condominiums, so-called reflected light damage, which causes light to be reflected by the mounted window glass etc. and causes glare to users of other nearby buildings, is a frequent problem It has become. Therefore, in the construction of a building, it is required to take sufficient measures against the above-mentioned reflected light damage.
　ここで、建築物の窓ガラスからの反射光の眩しさ対策としては、例えば、建築物の壁面にルーバーなどを設置して反射光を直接遮る方法が挙げられる。しかし、ルーバーの設置は、工事が大掛かりでコストが高く、建築物のデザイン性にも影響することから、所有者に敬遠されることが多い。 Here, as a measure against glare of the reflected light from the window glass of the building, for example, there is a method in which a louver or the like is installed on the wall of the building to directly block the reflected light. However, the installation of louvers is a large-scale work, is expensive, and affects the design of a building, so it is often the case that the owner disrespects.
　一方、建築物の窓ガラスの防眩性を向上する方法としては、上述した方法以外に、窓ガラスにフィルムを貼って反射特性を改善する方法が挙げられる。 On the other hand, as a method of improving the antiglare property of the window glass of a building, the method of sticking a film on a window glass and improving a reflective characteristic other than the method mentioned above is mentioned.
　例えば、防眩性を含む反射特性を改善し得るフィルムとして、特許文献１は、基材フィルム上に紫外線硬化樹脂を用いてランダム凹凸形状面を有するＡＧ（アンチグレア）層を形成するとともに、その凹凸形状を平坦化するように低屈折率樹脂からなる層を形成することにより、可視光域での反射率をフラットにしつつ、ディスプレイに貼り付けた場合に黒を際立たせることができる光学フィルムが得られることを開示している。 For example, as a film capable of improving reflection characteristics including antiglare property, Patent Document 1 uses an ultraviolet curing resin on a base film to form an AG (antiglare) layer having a random uneven shape surface, and the unevenness By forming a layer made of a low refractive index resin so as to flatten the shape, an optical film which can make black stand out when attached to a display while flatting the reflectance in the visible light region is obtained. Is disclosed.
　また、特許文献２は、基材フィルム上に紫外線硬化樹脂を用いて金型表面の凹凸を転写成形してフィルムを得る際に、所定粒径のブラスト粒子を衝打させた金型表面を用いることにより、高い透過鮮明度を保ちつつギラツキが低減したフィルムが得られることを開示している。 Further, Patent Document 2 uses a mold surface which is made to strike blast particles of a predetermined particle size when transfer molding of irregularities on a mold surface using a UV curable resin on a base film to obtain a film. It is disclosed that a film with reduced glare can be obtained while maintaining high transmission sharpness.
国際公開２０１５／０７１９４３号International Publication 2015/071943 特開２０１６－０１２０９５号公報JP, 2016-012095, A
　しかしながら、上述した従来のフィルムは、いずれも、パソコンや液晶テレビなどの液晶パネルの表示面に設けられる偏光板に主として用いられるものである。そして、上述した従来のフィルムは、いずれも、窓ガラスに用いて高い防眩性と眺望性とを両立させる観点では、改善の余地がある。 However, all of the above-mentioned conventional films are mainly used for a polarizing plate provided on the display surface of a liquid crystal panel such as a personal computer or a liquid crystal television. And all the conventional films mentioned above have room for improvement in a viewpoint which makes high anti-glare property and viewability compatible by using for window glass.
　本発明は、従来における前記諸問題を解決し、以下の目的を達成することを課題とする。即ち、本発明の目的は、防眩性及び眺望性に優れる光学体、並びに、防眩性及び眺望性に優れる窓材を提供することにある。 An object of the present invention is to solve the above-mentioned problems in the prior art and to achieve the following objects. That is, an object of the present invention is to provide an optical body excellent in antiglare property and viewability, and a window material excellent in antiglare property and viewability.
　本発明者らは、前記目的を達成すべく、フィルムに限定することなく、鋭意検討を行った。その結果、微細凹凸表面の粗さの特性の適正化を図ることで、高い防眩性及び眺望性を両立させられることを見出し、本発明の完成に至った。 In order to achieve the above-mentioned purpose, the present inventors diligently studied without limiting to a film. As a result, it has been found that high antiglare properties and viewability can be achieved at the same time by optimizing the characteristics of the surface roughness of the fine uneven surface, and the present invention has been completed.
　本発明は、本発明者らによる前記知見に基づくものであり、前記課題を解決するための手段としては以下の通りである。即ち、
＜１＞　微細凹凸層を備える光学体であって、
　微細凹凸表面の３５．３μｍ×２６．５μｍの長方形領域において、
　　算術平均粗さＲａが０．２μｍ以下であり、且つ、
　　粗さ曲線要素の平均長さＲＳｍが１０μｍ以下であるか、又は、当該長方形の面積に対する表面積の割合が１．０４以上１．５以下である、
ことを特徴とする、光学体である。 The present invention is based on the findings by the present inventors, and means for solving the problems are as follows. That is,
<1> It is an optical body provided with a fine concavo-convex layer,
In the 35.3 μm × 26.5 μm rectangular area of the fine uneven surface,
Arithmetic mean roughness Ra is 0.2 μm or less, and
The average length RSm of the roughness curvilinear element is 10 μm or less, or the ratio of the surface area to the area of the rectangle is 1.04 or more and 1.5 or less.
It is an optical body characterized by
＜２＞　第１透明無機層と、第２透明無機層とを更に備え、
　前記第１透明無機層は、前記微細凹凸層の微細凹凸表面上に配置され、前記第２透明無機層は、前記第１透明無機層上に配置される、＜１＞に記載の光学体である。 <2> A first transparent inorganic layer and a second transparent inorganic layer are further provided,
The optical body according to <1>, wherein the first transparent inorganic layer is disposed on the fine asperity surface of the fine asperity layer, and the second transparent inorganic layer is disposed on the first transparent inorganic layer is there.
＜３＞　前記第１透明無機層が、ＺｎＯ及びＣｅＯ2の少なくともいずれかを含有し、
　前記第２透明無機層が、ＳｉＯ2、ＳｉＮ、ＳｉＯＮ及びＭｇＦ2の少なくともいずれかを含有する、前記＜２＞に記載の光学体である。 <3> The first transparent inorganic layer contains at least one of ZnO and CeO 2 ,
The optical body according to <2>, wherein the second transparent inorganic layer contains at least one of SiO 2 , SiN, SiON, and MgF 2 .
＜４＞　全ヘイズが１５％以上６０％以下であり、内部ヘイズが４％以下であり、測定角２０°における光沢度が４０以下であり、且つ、光学櫛幅２ｍｍにおける透過像鮮明度が５０％以上である、前記＜１＞～＜３＞のいずれかに記載の光学体である。 <4> The total haze is 15% or more and 60% or less, the internal haze is 4% or less, the glossiness at a measurement angle of 20 ° is 40 or less, and the transmitted image definition at an optical comb width of 2 mm is 50 It is an optical body according to any one of the above <1> to <3>, which is% or more.
＜５＞　前記第２透明無機層上に第３透明無機層を更に備える、前記＜２＞～＜４＞のいずれかに記載の光学体である。 <5> The optical body according to any one of <2> to <4>, further including a third transparent inorganic layer on the second transparent inorganic layer.
＜６＞　ガラス基板と、前記＜１＞～＜５＞のいずれかに記載の光学体とを備える、ことを特徴とする、窓材である。 <6> A window material comprising: a glass substrate; and the optical body according to any one of <1> to <5>.
　本発明によれば、従来における前記諸問題を解決し、前記目的を達成することができ、防眩性及び眺望性に優れる光学体、並びに、防眩性及び眺望性に優れる窓材を提供することができる。 According to the present invention, the above-mentioned various problems in the prior art can be solved, and the above object can be achieved, and an optical body excellent in antiglare property and viewability, and a window material excellent in antiglare property and viewability be able to.
本発明の一実施形態に係る光学体の構成例を示す模式断面図である。It is a schematic cross section which shows the structural example of the optical body which concerns on one Embodiment of this invention. 本発明の一実施形態に係る光学体の微細凹凸層を形成するための、一例の方法を示す模式図である。It is a schematic diagram which shows the method of an example for forming the fine grooving | roughness layer of the optical body which concerns on one Embodiment of this invention. 本発明の一実施形態に係る光学体の構成例を示す模式断面図である。It is a schematic cross section which shows the structural example of the optical body which concerns on one Embodiment of this invention. 本発明の一実施形態に係る光学体の構成例を示す模式断面図である。It is a schematic cross section which shows the structural example of the optical body which concerns on one Embodiment of this invention. 本発明の一実施形態に係る光学体の構成例を示す模式断面図である。It is a schematic cross section which shows the structural example of the optical body which concerns on one Embodiment of this invention. 本発明の一実施形態に係る窓材の構成例を示す模式断面図である。It is a schematic cross section which shows the structural example of the window material which concerns on one Embodiment of this invention. 本発明の一実施形態に係る窓材の構成例を示す模式断面図である。It is a schematic cross section which shows the structural example of the window material which concerns on one Embodiment of this invention. 本発明の一実施形態に係る窓材の構成例を示す模式断面図である。It is a schematic cross section which shows the structural example of the window material which concerns on one Embodiment of this invention.
（光学体）
　図１に示すように、本発明の一実施形態に係る光学体（以下、「本実施形態に係る光学体」と称することがある。）６０は、少なくとも、微細凹凸層６３を備える。また、本実施形態に係る光学体は、更に必要に応じて、第１透明無機層、第２透明無機層、第３透明無機層、防汚コート層、その他の層などを備えることができる。 (Optical body)
As shown in FIG. 1, an optical body (hereinafter sometimes referred to as “optical body according to the present embodiment”) 60 according to an embodiment of the present invention includes at least a fine uneven layer 63. Moreover, the optical body which concerns on this embodiment can be further equipped with a 1st transparent inorganic layer, a 2nd transparent inorganic layer, a 3rd transparent inorganic layer, an antifouling coating layer, another layer, etc. as needed.
＜微細凹凸層＞
　微細凹凸層は、少なくとも一方の表面に微細な凹凸構造を有する層である。この凹凸構造は、規則的なパターンで形成されていてもよく、ランダムに形成されていてもよい。 <Fine unevenness layer>
The fine uneven layer is a layer having a fine uneven structure on at least one surface. The uneven structure may be formed in a regular pattern or may be formed randomly.
　微細凹凸層における微細凹凸表面は、３５．３μｍ×２６．５μｍの長方形領域において、算術平均粗さＲａが、０．２μｍ以下である。また、微細凹凸層における微細凹凸表面は、当該長方形領域において、粗さ曲線要素の平均長さＲＳｍが１０μｍ以下であるか、又は、当該長方形の面積（即ち、３５．３μｍ×２６．５μｍ＝９３５．４５μｍ2）に対する表面積（μｍ2）の割合（以下、「比表面積」と称することがある。）が１．０４以上１．５以下である。本発明者らは、驚くべきことに、微細凹凸表面の算術平均粗さＲａを０．２μｍ以下としつつ、粗さ曲線要素の平均長さＲＳｍ及び／又は比表面積を上述した範囲内にすることにより、可視光域の波長よりも小さい形状の凹凸が形成され得、一部の光を進行方向を変えずに透過させて、透過像鮮明度を高めることができ、防眩性と眺望性とが両立した光学体が得られることを見出した。 The fine uneven surface in the fine uneven layer has an arithmetic average roughness Ra of 0.2 μm or less in a rectangular region of 35.3 μm × 26.5 μm. In addition, in the micro-relief surface of the micro-relief layer, the average length RSm of the roughness curvilinear element is 10 μm or less or the area of the rectangle (ie, 35.3 μm × 26.5 μm = 935) in the rectangular region. ratio of surface area to .45μm 2) (μm 2) (hereinafter sometimes referred to as "specific surface area".) is 1.04 to 1.5. The present inventors surprisingly set the average length RSm and / or the specific surface area of the roughness curvilinear element within the above-mentioned range, while making the arithmetic average roughness Ra of the micro uneven surface 0.2 μm or less. As a result, unevenness having a shape smaller than the wavelength of the visible light region can be formed, and a part of the light can be transmitted without changing the traveling direction, and the transmitted image definition can be enhanced. It has been found that an optical body compatible with is obtained.
　また、微細凹凸層における微細凹凸表面は、防眩性及び眺望性をより高める観点から、粗さ曲線要素の平均長さＲＳｍが１０μｍ以下であり、且つ、比表面積が１．０４以上１．５以下であることが好ましい。 In addition, from the viewpoint of enhancing the antiglare property and the viewability, the fine asperity surface in the fine asperity layer has an average length RSm of the roughness curvilinear element of 10 μm or less and a specific surface area of 1.04 to 1.5. It is preferable that it is the following.
　微細凹凸層における微細凹凸表面の算術平均粗さＲａは、より高い防眩性及と眺望性とを両立させる観点から、０．１８μｍ以下であることが好ましく、０．１４μｍ以下であることがより好ましい。一方、微細凹凸層における微細凹凸表面の算術平均粗さＲａは、防眩性をより高める観点から、０．０８μｍ以上であることが好ましく、０．０９μｍ以上であることがより好ましい。 Arithmetic mean roughness Ra of the fine asperity surface in the fine asperity layer is preferably 0.18 μm or less, more preferably 0.14 μm or less from the viewpoint of achieving both higher antiglare property and viewability. preferable. On the other hand, the arithmetic average roughness Ra of the fine asperity surface in the fine asperity layer is preferably 0.08 μm or more, and more preferably 0.09 μm or more, from the viewpoint of further enhancing the antiglare property.
　また、微細凹凸層における微細凹凸表面の粗さ曲線要素の平均長さＲＳｍは、透過像鮮明度を一層高める観点から、６μｍ以下であることが好ましい。また、微細凹凸層における微細凹凸表面の粗さ曲線要素の平均長さＲＳｍは、より高い防眩性及と眺望性とを両立させる観点、及び微細凹凸の物理強度を高める観点から、２μｍ以上であることが好ましい。 The average length RSm of the surface roughness curvilinear element of the surface with fine asperities in the surface asperity layer is preferably 6 μm or less from the viewpoint of further enhancing the clearness of the transmitted image. In addition, the average length RSm of the surface roughness curvilinear element of the surface asperity in the surface asperity layer is 2 μm or more from the viewpoint of achieving both higher antiglare property and viewability, and from the viewpoint of enhancing the physical strength of the surface asperity. Is preferred.
　また、微細凹凸層における微細凹凸表面の比表面積は、防眩性を一層高める観点から、１．１以上であることが好ましい。また、微細凹凸層における微細凹凸表面の比表面積は、眺望性を一層高める観点から、１．４以下であることが好ましい。 In addition, the specific surface area of the fine asperity surface in the fine asperity layer is preferably 1.1 or more from the viewpoint of further enhancing the antiglare property. Moreover, it is preferable that the specific surface area of the fine uneven | corrugated surface in a fine uneven | corrugated layer is 1.4 or less from a viewpoint of improving a viewability further.
　上述したＲａ、ＲＳｍ及び比表面積は、実施例で用いた方法により、測定することができる。 The above Ra, RSm and specific surface area can be measured by the method used in the examples.
　ここで、微細凹凸層は、例えば、形状転写法、相分離法、フィラー分散法などにより、形成することができる。以下、一例として、形状転写法による微細凹凸層の形成方法について、図２を参照して説明する。 Here, the 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.
　図２は、本実施形態に係る光学体の微細凹凸層を形成するための方法の一例である、形状転写法を示す模式図である。図２に示される形状転写装置１は、原盤２と、基材供給ロール５１と、巻取ロール５２と、ガイドロール５３、５４と、ニップロール５５と、剥離ロール５６と、塗布装置５７と、光源５８とを備える。 FIG. 2: is a schematic diagram which shows the shape transfer method which is an example of the method for forming the fine concavo-convex layer of the optical body which concerns on this embodiment. The shape transfer device 1 shown in FIG. 2 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 device 57, and a light source. And 58.
　基材供給ロール５１は、シート状の基材６１がロール状に巻かれたロールであり、巻取ロール５２は、微細凹凸構造２３が転写された樹脂層６２を積層した基材６１を巻き取るロールである。また、ガイドロール５３、５４は、基材６１を搬送するロールである。ニップロール５５は、樹脂層６２が積層された基材６１を円筒形状の原盤２に対して密着させるロールであり、剥離ロール５６は、微細凹凸構造２３が樹脂層６２に転写された後、樹脂層６２が積層された基材６１を原盤２から剥離するロールである。ここで、基材６１は、例えば、ＰＥＴ樹脂又はポリカーボネート樹脂などのプラスチック製の基材とすることができ、また、プラスチック製の透明なフィルムとすることができる。 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 role. The guide rolls 53 and 54 are rolls for transporting the base 61. The nip roll 55 is a roll for closely adhering the base material 61 on which the resin layer 62 is laminated to 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. 62 is a roll for peeling the base material 61 on which the 62 is laminated from the master 2. Here, the substrate 61 may be, for example, a plastic substrate such as a PET resin or a polycarbonate resin, and may be a plastic transparent film.
　塗布装置５７は、コーターなどの塗布手段を備え、紫外線硬化性樹脂を含む組成物（紫外線硬化性樹脂組成物）を基材６１に塗布し、樹脂層６２を形成する。塗布装置５７は、例えば、グラビアコーター、ワイヤーバーコーター又はダイコーターなどであってもよい。また、光源５８は、紫外光を発する光源であり、例えば、紫外線ランプなどとすることができる。 The coating device 57 includes a coating unit such as a coater, and applies a composition (a UV curable resin composition) containing a UV curable resin 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.
　紫外線硬化性樹脂は、紫外線が照射されることにより流動性が低下し、硬化する樹脂であり、具体的には、アクリル系樹脂などが挙げられる。また、紫外線硬化性樹脂組成物は、必要に応じて、開始剤、フィラー、機能性添加剤、溶剤、無機材料、顔料、帯電防止剤又は増感色素などを含有していてもよい。 An ultraviolet curable resin is a resin which is reduced in fluidity by being irradiated with ultraviolet light and is cured. 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, etc. as needed.
　形状転写装置１では、まず、基材供給ロール５１からガイドロール５３を介して、シート状の基材６１が連続的に送出される。送出された基材６１に対して、塗布装置５７により紫外線硬化性樹脂組成物が塗布され、基材６１に樹脂層６２が積層される。また、樹脂層６２が積層された基材６１は、ニップロール５５により、原盤２に密着する。これにより、原盤２の外周面に形成された微細凹凸構造２３が樹脂層６２に転写される。微細凹凸構造２３が転写された後、樹脂層６２は、光源５８からの光の照射により硬化する。続いて、硬化した樹脂層６２が積層された基材６１は、剥離ロール５６により原盤２から剥離され、ガイドロール５４を介して、巻取ロール５２によって巻き取られる。
　このような形状転写装置１により、微細凹凸表面を有する微細凹凸層を連続的に形成することができる。ここで、微細凹凸表面のＲａ、ＲＳｍ及び比表面積は、例えば、原盤２の微細凹凸構造２３を適宜変更することにより、調整することができる。 In the shape transfer device 1, first, the sheet-like base material 61 is continuously delivered from the base material supply roll 51 via the guide roll 53. The ultraviolet curable resin composition is applied to the base material 61 that has been sent out by the coating device 57, and the resin layer 62 is laminated on the base material 61. Further, the base 61 on which the resin layer 62 is laminated is in close contact with the master 2 by the nip roll 55. Thereby, the fine concavo-convex 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 the irradiation of light 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, it is possible to continuously form a fine uneven layer having a fine uneven surface. Here, Ra, RSm, and the specific surface area of the fine uneven surface can be adjusted, for example, by appropriately changing the fine uneven structure 23 of the master 2.
　なお、上述した形状転写法では、基材と紫外線硬化性樹脂とを準備し、当該樹脂を用いて基材上に微細凹凸層を形成している（即ち、図１に示すように、微細凹凸層６３が、基材６１と微細凹凸構造を有する樹脂層６２とからなる）が、本発明の光学体の微細凹凸層は、これに制限されず、例えば、紫外線硬化性樹脂や熱硬化性樹脂等の樹脂からなる基材に微細凹凸構造を直接形成したもの（即ち、図３に示すように、微細凹凸層６３が、基材６１のみからなるもの）であってもよい。 In the shape transfer method described above, the base material and the ultraviolet curable resin are prepared, and the fine asperity layer is formed on the base material using the resin (that is, as shown in FIG. 1, the fine asperity layer) Although the layer 63 is composed of the base material 61 and the resin layer 62 having a fine concavo-convex structure), the fine concavo-convex layer of the optical body of the present invention is not limited thereto. For example, UV curable resin or thermosetting resin The fine uneven structure may be directly formed on a base material made of a resin such as (that is, as shown in FIG. 3, the fine uneven layer 63 may be formed of only the base material 61).
＜第１透明無機層＞
　また、図４に示すように、本実施形態に係る光学体６０は、微細凹凸層６３の微細凹凸表面上に第１透明無機層６４を備えることが好ましい。この第１透明無機層６４は、透明性を有するとともに、例えば、所定の波長の光を吸収する機能を有することができる。また、第１透明無機層６４は、例えば、スパッタ法又はＣＶＤ法により形成することができる。
　なお、本明細書において「透明」又は「透明性を有する」とは、透過像鮮明度が高く、光学体を通して像が明確に視認できることを指すものとする。 <First transparent inorganic layer>
Further, as shown in FIG. 4, the optical body 60 according to the present embodiment preferably includes the first transparent inorganic layer 64 on the surface of the fine asperity layer 63. The first transparent inorganic layer 64 has transparency and can have a function of absorbing light of a predetermined wavelength, for example. The first transparent inorganic layer 64 can be formed by, for example, a sputtering method or a CVD method.
In the present specification, “transparent” or “having transparency” means that the transmitted image definition is high and the image can be clearly viewed through the optical body.
　第１透明無機層の主成分は、２．８ｅＶ以上４．８ｅＶ以下のバンドギャップを有する無機化合物であることが好ましい。ここで、バンドギャップは、吸収端の波長を表し、広義的に、バンドギャップに相当する波長を下回る光を吸収し、バンドギャップに相当する波長以上の光を透過することを示す。そして、上述した２．８ｅＶ以上４．８ｅＶ以下のバンドギャップは、Ｐｌａｎｃｋ定数（６．６２６×１０-34Ｊ・ｓ）及び光速度（２．９９８×１０8ｍ／ｓ）を用いて得られる波長λとバンドギャップエネルギーＥとの関係式：「λ（ｎｍ）＝１２４０／Ｅ（ｅＶ）」から、おおよそ、紫外領域と可視領域との境界である２６０ｎｍ以上４４０ｎｍ以下の範囲内に吸収端の波長があることを示している。従って、上述した無機化合物を第１透明無機層に用いることにより、透明性と紫外線吸収特性とを両立することができる。同様の観点から、第１透明無機層の主成分は、３．０ｅＶ以上３．７ｅＶ以下（波長換算でおよそ３４０ｎｍ以上４２０ｎｍ以下）のバンドギャップを有する無機化合物であることがより好ましい。また、生産性の低下やクラック発生のリスクを抑制するために薄膜化を図ることも踏まえれば、第１透明無機層の主成分は、３．０ｅＶ以上３．４ｅＶ以下（波長換算でおよそ３６０ｎｍ以上４２０ｎｍ以下）のバンドギャップを有する無機化合物であることがより好ましい。
　なお、本明細書において「主成分」とは、含有量が最も多い成分を指すものとする。 The main component of the first transparent inorganic layer 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 represents the wavelength of the absorption edge, and in a broad sense, it indicates that the light below the wavelength corresponding to the band gap is absorbed, and the light above the wavelength corresponding to the band gap is transmitted. And the band gap of 2.8 eV or more and 4.8 eV or less mentioned above is obtained using a Planck constant (6.626 * 10 < - > 34J * s) and a light speed (2.998 * 10 < 8 > m / s) From the relationship 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 or more and 440 nm or less, which is the boundary between the ultraviolet region and the visible region. It indicates that there is a wavelength. Accordingly, by using the above-described inorganic compound for the first transparent inorganic layer, it is possible to achieve both transparency and ultraviolet absorption characteristics. From the same viewpoint, the main component of the first transparent inorganic layer 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, taking into account the reduction in productivity and the risk of cracking, the main component of the first transparent inorganic layer is 3.0 eV or more and 3.4 eV or less (approximately 360 nm or more in wavelength conversion) It is more preferable that it is an inorganic compound having a band gap of 420 nm or less.
In addition, in this specification, a "main component" shall refer to the component with most content.
　なお、２．８ｅＶ以上４．８ｅＶ以下のバンドギャップを有する無機化合物としては、具体的に、ＺｎＯ、ＣｅＯ2、ＴｉＯ2、ＳｎＯ2、Ｉｎ2Ｏ3、Ｎｂ2Ｏ5、Ｔａ2Ｏ5、ＳｉＣ、ＺｎＳなどが挙げられる。また、３．０ｅＶ以上３．７ｅＶ以下のバンドギャップを有する無機化合物の例としては、具体的に、ＺｎＯ、ＣｅＯ2、ＴｉＯ2、Ｎｂ2Ｏ5、ＳｉＣ、ＺｎＳなどが挙げられる。更に、３．０ｅＶ以上３．４ｅＶ以下のバンドギャップを有する無機化合物の例としては、具体的に、ＺｎＯ、ＣｅＯ2などが挙げられる。以上を考慮して、第１透明無機層は、ＺｎＯ及びＣｅＯ2の少なくともいずれかを含有することが好ましい。
　なお、本明細書において、「ＺｎＯ」は、アルミニウム（Ａｌ）でドープされたＺｎＯ、及び、その他の元素でドープされたＺｎＯを含むものとする。
　また、本明細書において、「ＣｅＯ2」は、ガドリニウム（Ｇｄ）でドープされたＣｅＯ2（ＣｅＧｄＯ2と総称されることがある）（Ｃｅ0.9Ｇｄ0.1Ｏ2など）、サマリウム（Ｓｍ）でドープされたＣｅＯ2、及び、その他の元素でドープされたＣｅＯ2を含むものとする。
　また、これら無機化合物は、一種単独で第１透明無機層に用いてもよく、二種以上を組み合わせて第１透明無機層に用いてもよい。 Specific examples of the inorganic compound having a band gap of 2.8 eV or more and 4.8 eV or less include ZnO, CeO 2 , TiO 2 , SnO 2 , In 2 O 3 , Nb 2 O 5 , and Ta 2 O 5 . SiC, ZnS and the like can be mentioned. Further, specific 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. Further, specific examples of the inorganic compound having a band gap of 3.0 eV or more and 3.4 eV or less include ZnO, CeO 2 and the like. In consideration of the above, the first transparent inorganic layer preferably contains at least one of ZnO and CeO 2 .
In the present specification, “ZnO” includes ZnO doped with aluminum (Al) and ZnO doped with other elements.
Furthermore, in the present specification, “CeO 2 ” is doped with gadolinium (Gd) -doped CeO 2 (sometimes collectively referred to as “CeGdO 2” ) (eg, Ce 0.9 Gd 0.1 O 2 ), samarium (Sm) It has been CeO 2, and is intended to include CeO 2 doped with other elements.
These inorganic compounds may be used alone in the first transparent inorganic layer, or may be used in combination of two or more in the first transparent inorganic layer.
　第１透明無機層は、厚みが、７０ｎｍ以上であることが好ましく、また、４００ｎｍ以下であることが好ましい。第１透明無機層の厚みが７０ｎｍ以上であることにより、十分に高い紫外線吸収特性を得ることができ、また、４００ｎｍ以下であることにより、生産性の低下やクラック発生のリスクを抑制することができる。同様の観点から、第１透明無機層の厚みは、１００ｎｍ以上であることがより好ましく、また、３００ｎｍ以下であることがより好ましい。 The thickness of the first transparent inorganic layer is preferably 70 nm or more, and preferably 400 nm or less. When the thickness of the first transparent inorganic layer is 70 nm or more, sufficiently high ultraviolet light absorption characteristics can be obtained, and when it is 400 nm or less, the risk of productivity decrease and crack generation can be suppressed. it can. From the same viewpoint, the thickness of the first transparent inorganic layer is more preferably 100 nm or more, and more preferably 300 nm or less.
＜第２透明無機層＞
　また、図４に示すように、本実施形態に係る光学体６０は、第１透明無機層６４に加え、当該第１透明無機層６４の上に、第２透明無機層６５を備えることが好ましい。第２透明無機層を備えることにより、第１透明無機層への雨などによる汚れの付着を防止することができる。この第２透明無機層は、透明性を有し、撥水性であっても親水性であってもよく、また、例えば、スパッタ法又はＣＶＤ法により形成することができる。 <Second transparent inorganic layer>
Further, as shown in FIG. 4, in addition to the first transparent inorganic layer 64, the optical body 60 according to the present embodiment preferably includes a second transparent inorganic layer 65 on the first transparent inorganic layer 64. . By providing the second transparent inorganic layer, it is possible to prevent the adhesion of dirt to the first transparent inorganic layer due to rain or the like. The second transparent inorganic layer has transparency, may be water-repellent or hydrophilic, and can be formed by, for example, a sputtering method or a CVD method.
　第２透明無機層の主成分は、第１透明無機層の主成分のバンドギャップよりも大きいバンドギャップを有することが好ましく、より具体的には、第１透明無機層の主成分のバンドギャップよりも４．０ｅＶ以上大きいバンドギャップを有する無機化合物であることが好ましい。第２透明無機層の主成分のバンドギャップが第１透明無機層の主成分のバンドギャップよりも大きい、好適には４．０ｅＶ以上大きいことにより、第１透明無機層の防汚性の向上に加えて、得られる光学体の防眩性を向上させることができる。
　具体的に、好ましい第２透明無機層の主成分としては、ＳｉＯ2、ＳｉＮ、ＳｉＯＮ、ＭｇＦ2などの無機化合物が挙げられる。言い換えると、第２透明無機層は、ＳｉＯ2、ＳｉＮ、ＳｉＯＮ及びＭｇＦ2の少なくともいずれかを含有することが好ましい。また、第２透明無機層は、少なくともＳｉＯ2を含有することがより好ましい。
　これら無機化合物は、一種単独で第２透明無機層に用いてもよく、二種以上を組み合わせて第２透明無機層に用いてもよい。 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, the band gap of the main component of the first transparent inorganic layer Is preferably an inorganic compound having a large band gap of 4.0 eV or more. When 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, preferably 4.0 eV or more, the stain resistance of the first transparent inorganic layer is improved. In addition, the antiglare property of the obtained optical body can be improved.
Specifically, as a main component of the preferable second transparent inorganic layer, inorganic compounds such as SiO 2 , SiN, SiON, MgF 2 and the like can be mentioned. 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 in combinations of two or more thereof in the second transparent inorganic layer.
　第２透明無機層は、厚みが、２０ｎｍ以上であることが好ましく、また、２００ｎｍ以下であることが好ましい。第２透明無機層の厚みが２０ｎｍ以上２００ｎｍ以下であることにより、反射率を十分に低減し、防眩性をより効果的に向上させることができる。同様の観点から、第２透明無機層の厚みは、４０ｎｍ以上であることがより好ましく、また、１００ｎｍ以下であることがより好ましい。 The thickness of the second transparent inorganic layer is preferably 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 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.
＜第３透明無機層＞
　更に、本実施形態に係る光学体は、図５に示すように、第１透明無機層６４及び第２透明無機層６５に加え、第２透明無機層６５の上に、第３透明無機層６６を更に備えることが好ましい。第３透明無機層を備えることにより、第１透明無機層及び第２透明無機層の薬品による劣化を抑制することができる。この第３透明無機層は、透明性を有し、撥水性であっても親水性であってもよく、また、例えば、スパッタ法又はＣＶＤ法により形成することができる。 <Third transparent inorganic layer>
Furthermore, as shown in FIG. 5, in addition to the first transparent inorganic layer 64 and the second transparent inorganic layer 65, the optical body according to the present embodiment has a third transparent inorganic layer 66 on the second transparent inorganic layer 65. It is preferable to further comprise By providing the third transparent inorganic layer, the deterioration of the first transparent inorganic layer and the second transparent inorganic layer due to chemicals can be suppressed. The third transparent inorganic layer has transparency, may be water-repellent or hydrophilic, and can be formed by, for example, a sputtering method or a CVD method.
　第３透明無機層は、主成分として、ＳｉＯ2、ＳｉＮ、ＳｉＯＮ及びＭｇＦ2の少なくともいずれかを含有することができる。また、第３透明無機層は、付加的成分としてＺｒＯ2、Ｎｂ2Ｏ5、ＳｎＯ2を更に含有することが好ましい。そして、第３透明無機層における上記付加的成分の割合は、６質量％以上５０質量％以下であることが好ましい。上記付加的成分の割合が６質量％以上であることにより、耐薬品性の改善効果を十分に得ることができ、また、５０質量％以下であることにより、第２透明無機層との屈折率差を適度に保ち、光学設計の困難化を回避することができる。同様の観点から、第３透明無機層における上記付加的成分の割合は、１３質量％以上であることがより好ましく、２０質量％以上であることが更に好ましく、また、３０質量％以下であることがより好ましい。付加的成分は、一種単独で用いてもよく、二種以上を組み合わせて用いてもよい。 The third transparent inorganic layer can contain at least one of SiO 2 , SiN, SiON and MgF 2 as a main component. The third transparent inorganic layer preferably further contains ZrO 2 , Nb 2 O 5 or SnO 2 as an additional component. And it is preferable that the ratio of the said additional component in a 3rd transparent inorganic layer is 6 to 50 mass%. When the proportion of the additional component is 6% by mass or more, the effect of improving the chemical resistance can be sufficiently obtained, and by being 50% by mass or less, the refractive index with the second transparent inorganic layer It is possible to keep the difference moderate and avoid the difficulty of optical design. From the same viewpoint, the ratio of the additional component in the third transparent inorganic layer is more preferably 13% by mass or more, still more preferably 20% by mass or more, and 30% by mass or less Is more preferred. The additional components may be used alone or in combination of two or more.
　第３透明無機層は、厚みが、２０ｎｍ以上であることが好ましい。第３透明無機層の厚みが２０ｎｍ以上であることにより、より十分に高い耐薬品性を得ることができる。また、第３透明無機層は、厚みが、２００ｎｍ以下であることが好ましい。第３透明無機層の厚みが２００ｎｍ以下であることにより、生産性の低下やクラック発生のリスクを抑制することができる。同様の観点から、第３透明無機層の厚みは、１００ｎｍ以下であることがより好ましい。 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, a sufficiently high 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 risk of productivity decrease and crack generation. From the same viewpoint, the thickness of the third transparent inorganic layer is more preferably 100 nm or less.
＜防汚コート層＞
　本実施形態に係る光学体は、微細凹凸層の微細凹凸表面の側の最表面に、防汚コート層を備えることが好ましい。具体的には、本実施形態に係る光学体は、微細凹凸層の上、第２透明無機層の上、又は、第３透明無機層の上に、防汚コート層を備えることが好ましい。防汚コート層を備えることにより、光学体への汚れの付着を低減することができるとともに、付着した汚れを容易に落とすことができ、光学体が所期の性能をより長期的に発揮することができる。
　なお、防汚コート層は、接着性が高い観点から、ＳｉＯ2を主成分とする第２透明無機層又は第３透明無機層の上に備えることが好ましい。 <Antifouling coating layer>
It is preferable that the optical body which concerns on this embodiment equips the outermost surface by the side of the fine concavo-convex surface of a fine concavo-convex layer with an antifouling coat layer. Specifically, the optical body according to the present embodiment preferably includes an antifouling coating layer on the fine concavo-convex layer, on the second transparent inorganic layer, or on the third transparent inorganic layer. By providing the anti-soiling coating layer, it is possible to reduce the adhesion of dirt to the optical body, and also to easily remove the deposited dirt, so that the optical body exerts the expected performance for a longer period of time. Can.
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.
　防汚コート層の主成分は、撥水性であっても親水性であってもよく、また、撥油性であっても親油性であってもよい。ただし、より効果的に防汚性を高める観点から、防汚コート層の主成分は、撥水性で且つ撥油性であることが好ましい。撥水性に関して具体的に言うと、防汚コート層は、純水接触角が１１０°以上であることが好ましく、１１５°以上であることがより好ましい。これらの性質を有するものとして、防汚コート層の主成分は、パーフルオロポリエーテルであることが好ましい。 The main component of the antifouling coating layer may be water-repellent or hydrophilic, and may be oil- or lipophilic. However, from the viewpoint of more effectively enhancing 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 to those having these properties, the main component of the antifouling coating layer is preferably a perfluoropolyether.
　防汚コート層は、厚みが、５ｎｍ以上であることが好ましく、また、２０ｎｍ以下であることが好ましく、例えば１０ｎｍである。防汚コート層の厚みが５ｎｍ以上であることにより、光学体の防汚性を十分に高めることができ、また、２０ｎｍ以下であることにより、微細凹凸層の凹凸構造の埋没を回避することができる。 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, the burying of the uneven structure of the fine uneven layer can be avoided. it can.
＜その他の層＞
　本実施形態に係る光学体は、特に制限されず、上述した層以外のその他の層を備えていてもよい。
　例えば、本実施形態に係る光学体は、上述した微細凹凸層と第１透明無機層とを強固に密着させるため、これらの間に密着層を備えていてもよい。この密着層としては、例えば、ＳｉＯx層が挙げられ、厚みは、例えば、２ｎｍ以上１０ｎｍ以下とすることができる。この密着層は、例えば、スパッタ法又はＣＶＤ法により形成することができる。 <Other layers>
The optical body according to the present embodiment is not particularly limited, and may have other layers in addition to the layers described above.
For example, the optical body according to the present embodiment may be provided with an adhesion layer between the fine concavo-convex layer and the first transparent inorganic layer in order to firmly adhere the layer. As this adhesion layer, for example, a SiO x layer can be mentioned, and the thickness can be, for example, 2 nm or more and 10 nm or less. The adhesion layer can be formed, for example, by sputtering or CVD.
　また、本実施形態に係る光学体は、微細凹凸層の、微細凹凸表面とは反対側の面に、可視光を吸収する粘着層を備えることが好ましい。微細凹凸表面とは反対側の面に可視光を吸収する粘着層を備えることで、図６に示すような、当該光学体の粘着層８４を備える面にガラス基板８１を積層させた窓材８０において、（任意の第１透明無機層６４及び）微細凹凸層６３を透過して粘着層８４に入射する可視光、並びに、（任意の第１透明無機層６４、）微細凹凸層６３及び粘着層８４を透過した後、ガラス基板８１で反射して粘着層８４に入射する可視光などを効率良く吸収して可視光線透過率を低減し、高い眺望性を維持したまま、防眩性をより改善することができる。加えて、可視光吸収率の異なる粘着層を用いることで、光沢度の異なる商品ラインナップを容易に揃えることができるようになるというメリットもある。
　なお、可視光を吸収する粘着層は、例えば、粘着性を有する材料に、可視光を吸収する染料又は顔料等の着色剤を任意の割合で分散させたものを用いて、調製することができる。
　一方で、例えば可視光を吸収する染料や顔料の割合が多く、粘着力が低下したり、耐久性が悪化するなどの不具合がある場合等には、染料又は顔料等の着色剤を含有させた可視光を吸収する基材や、ＤＬＣ等の可視光を吸収する無機膜を、微細凹凸層の上に積層させても良い。 Moreover, it is preferable that the optical body which concerns on this embodiment equips the surface on the opposite side to the fine concavo-convex surface of the fine concavo-convex layer with the adhesion layer which absorbs visible light. A window material 80 in which a glass substrate 81 is laminated on the surface provided with the adhesive layer 84 of the optical body as shown in FIG. 6 by providing the adhesive layer absorbing visible light on the surface opposite to the fine uneven surface. Visible light which passes through (the optional first transparent inorganic layer 64 and the fine concavo-convex layer 63 and is incident on the adhesive layer 84, and (the optional first transparent inorganic layer 64), the fine concavo-convex layer 63 and the adhesive layer After passing through 84, visible light and the like reflected by the glass substrate 81 and incident on the adhesive layer 84 are efficiently absorbed to reduce the visible light transmittance, and the antiglare property is further improved while maintaining high viewability. can do. In addition, there is an advantage that by using adhesive layers having different visible light absorptivity, product lineups having different glossiness can be easily aligned.
In addition, the adhesion layer which absorbs visible light can be prepared, for example, using a material having adhesiveness, in which a coloring agent such as a dye or a pigment which absorbs visible light is dispersed at an arbitrary ratio. .
On the other hand, for example, in the case where the ratio of dyes and pigments that absorb visible light is large and there is a problem such as a decrease in adhesion or deterioration in durability, etc., colorants such as dyes or pigments are contained. A substrate that absorbs visible light or an inorganic film that absorbs visible light, such as DLC, may be stacked on the fine uneven layer.
＜光学体の特性＞
　本実施形態に係る光学体は、測定角２０°における光沢度が、４０以下であることが好ましい。測定角２０°における光沢度が４０以下であることにより、光学体の防眩性を十分に高いものとすることができる。同様の観点から、光学体の測定角２０°における光沢度は、３０以下であることがより好ましく、２０以下であることが更に好ましい。
　なお、光学体の測定角２０°における光沢度は、実施例で用いた方法により、測定することができる。 <Characteristics of optical body>
The optical body according to the present embodiment preferably has a glossiness of 40 or less at a measurement angle of 20 °. When the glossiness at a measurement angle of 20 ° is 40 or less, the antiglare property of the optical body can be made sufficiently high. From the same viewpoint, the glossiness at a measurement angle of 20 ° of the optical body is more preferably 30 or less, and still more preferably 20 or less.
In addition, the glossiness in 20 degrees of measurement angles of an optical body can be measured by the method used in the Example.
　本実施形態に係る光学体は、光学櫛幅２ｍｍにおける透過像鮮明度が、５０％以上であることが好ましい。光学櫛幅２ｍｍにおける透過像鮮明度が５０％以上であることにより、光学体の眺望性を十分に高いものとすることができる。同様の観点から、光学体の光学櫛幅２ｍｍにおける透過像鮮明度は、７０％以上であることがより好ましく、８０％以上であることが更に好ましい。
　なお、光学体の光学櫛幅２ｍｍにおける透過像鮮明度は、実施例で用いた方法により、測定することができる。 The optical body according to the present embodiment preferably has a transmitted image definition of 50% or more at an optical comb width of 2 mm. When the transmitted image definition in an optical comb width of 2 mm is 50% or more, the viewability of the optical body can be made sufficiently high. From the same point of view, the transmitted image definition at an optical comb width of 2 mm of the optical body is more preferably 70% or more, and still more preferably 80% or more.
In addition, the transmitted image clearness in 2 mm of optical comb widths of an optical body can be measured by the method used in the Example.
　本実施形態に係る光学体は、全ヘイズが１５％以上６０％以下であることが好ましい。全ヘイズが、１５％以上であることにより、防眩性を効果的に高めることができ、また、６０％以下であることにより、眺望性を効果的に高めることができる。同様の観点から、光学体の全ヘイズは、５０％以下であることがより好ましい。
　また、本実施形態に係る光学体は、内部ヘイズが４％以下であることが好ましい。内部ヘイズが、４％以下であることにより、眺望性をより高めることができる。同様の観点から、光学体の内部ヘイズは、２％以下であることがより好ましい。
　なお、光学体の全ヘイズ及び内部ヘイズは、実施例で用いた方法により、測定することができる。 The optical body according to the present embodiment preferably has a total haze of 15% or more and 60% or less. When the total haze is 15% or more, the antiglare property can be effectively enhanced, and when the total haze is 60% or less, the viewability can be effectively enhanced. From the same viewpoint, the total haze of the optical body is more preferably 50% or less.
The optical body according to the present embodiment preferably has an internal haze of 4% or less. By the internal haze being 4% or less, the view can be further enhanced. From the same viewpoint, the internal haze of the optical body is more preferably 2% or less.
In addition, the total haze and internal haze of an optical body can be measured by the method used in the Example.
　また、本実施形態に係る光学体は、波長３２０ｎｍの光の透過率が１０％以下であることが好ましく、６％以下であることがより好ましく、３％以下であることが更に好ましい。光学体の波長３２０ｎｍの光の透過率が１０％以下であることにより、紫外線による基材の黄変等の劣化を効果的に抑制することができるとともに、基材と樹脂層との密着耐久性を向上させることができる。
　なお、光学体の波長３２０ｎｍの光の透過率は、例えば、日本分光株式会社製「Ｖ－５６０」を用いて測定することができる。 In addition, the optical body according to the present embodiment preferably has a transmittance of 10% or less, more preferably 6% or less, and still more preferably 3% or less. When the transmittance of light with a wavelength of 320 nm of the optical body is 10% or less, deterioration such as yellowing of the base material due to ultraviolet light can be effectively suppressed, and adhesion durability between the base material and the resin layer Can be improved.
The transmittance of light of wavelength 320 nm of the optical body can be measured, for example, using “V-560” manufactured by JASCO Corporation.
（窓材）
　本発明の一実施形態に係る窓材（以下、「本実施形態に係る窓材」と称することがある。）は、ガラス基板と、上述した光学体とを備える。具体的に、図７に示すように、本実施形態に係る窓材８０は、上述した光学体６０とガラス基板８１とを、当該光学体６０の微細凹凸表面とは反対側の面がガラス基板８１と向かい合うように、積層させてなるものとすることができる。このように、本実施形態に係る窓材は、少なくとも上述した光学体を備え、防眩性及び眺望性の両方に優れるため、高層ビルや住宅等の建築用窓ガラス、車両用の窓ガラスなどとして、好適に用いることができる。
　なお、本実施形態に係る窓材は、上述した光学体を、ガラス基板の片面のみに備えていてもよく、両面に備えていてもよい。 (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 above-described optical body. Specifically, as shown in FIG. 7, the window member 80 according to the present embodiment has the optical body 60 and the glass substrate 81 described above, and the surface on the opposite side to the fine asperity surface of the optical body 60 is a glass substrate It can be made to laminate so that 81 may be faced. As described above, the window material according to the present embodiment includes at least the above-described optical body, and is excellent in both the antiglare property and the viewability, so window glass for buildings such as high-rise buildings and houses, window glass for vehicles, etc. Can be suitably used.
In addition, the window material which concerns on this embodiment may be equipped with the optical body mentioned above only on the single side | surface of a glass substrate, and may be equipped on both surfaces.
　また、上述した光学体と同様の考え方により、本実施形態に係る窓材における、測定角２０°における光沢度、光学櫛幅２ｍｍにおける透過像鮮明度、全ヘイズ、内部ヘイズ及び波長３２０ｎｍの光の透過率の好ましい範囲及び当該範囲が好ましい理由は、それぞれ、光学体に関して上述したものと同様である。 Further, according to the same concept as the optical body described above, the gloss at a measurement angle of 20 °, the transmitted image sharpness at an optical comb width of 2 mm, the total haze, the internal haze, and the light of wavelength 320 nm in the window material according to this embodiment. The preferred range of transmittance and the reason why the range is preferred are respectively the same as those described above for the optical body.
　本実施形態に係る窓材は、複層ガラスであってもよい。一般に、複層ガラスは、単層ガラスに比べて防眩性に劣るが、本実施形態に係る窓材は、上述した光学体を備えるため、複層ガラスであったとしても、高い防眩性をもたらすことができる。 The window material according to the present embodiment may be a multilayer glass. In general, double glazing is inferior in anti-glare property to single-layer glass, but the window material according to the present embodiment is highly anti-glare even if it is double glazing because it is provided with the optical body described above. Can bring
　ここで、複層ガラスとは、通常、図８に示すように、複数枚のガラス基板（８２，８３）がスペーサー８５を周縁に介して積層され、各ガラス基板の間に空間が形成されている構造を有するガラスを指す。
　そして、複層ガラスである本実施形態に係る窓材８０は、図８の（ａ）に示すように、窓ガラスとして建築物等に設置したときに屋外側になるガラス基板８２の屋外側の面のみに、光学体６０が設けられていてもよく、図８の（ｂ）～（ｄ）に示すように、屋外側になるガラス基板８２の屋外側の面に、光学体６０が設けられるとともに、屋内側になるガラス基板８３の片面及び／又は両面にも、光学体６０が設けられていてもよく、更に図８の（ｅ）～（ｈ）に示すように、屋外側になるガラス基板８２の両面に、光学体が設けられるとともに、任意に、屋内側になるガラス基板８３の片面及び／又は両面にも、光学体６０が設けられていてもよい。 Here, in general, as shown in FIG. 8, a plurality of glass substrates (82, 83) are laminated with the spacer 85 at the periphery, and a space is formed between the glass substrates, as shown in FIG. Refers to a glass having a structure.
And as shown in (a) of Drawing 8, window material 80 concerning this embodiment which is a double glazing is an outdoor side of glass substrate 82 which becomes an outdoor side when installed in a building etc. as window glass. The optical body 60 may be provided only on the surface, and as shown in (b) to (d) of FIG. 8, the optical body 60 is provided on the surface on the outdoor side of the glass substrate 82 serving as the outdoor side. In addition, the optical body 60 may be provided on one side and / or both sides of the glass substrate 83 on the indoor side, and as shown in (e) to (h) of FIG. The optical body is provided on both sides of the substrate 82, and optionally, the optical body 60 may be provided on one side and / or both sides of the glass substrate 83 which is the indoor side.
　また、本実施形態に係る窓材が複層ガラスであり、且つ、窓ガラスとして建築物等に設置したときに屋外側になるガラス基板の屋外側の面に光学体が設けられている場合には、当該光学体の微細凹凸表面とは反対側の面（より具体的には、当該光学体とガラス基板との間）に、可視光を吸収する粘着層を備えることが特に好ましい。このような可視光を吸収する粘着層を備えることにより、光学体を透過して粘着層に入射する可視光、光学体及び粘着層を透過した後、屋外側のガラス基板の屋内側の面で反射して粘着層に入射する可視光、並びに、光学体、粘着層及び屋外側のガラス基板を透過した後、屋内側のガラス基板で反射し、屋外側のガラス基板を透過して粘着層に入射する可視光などを効率良く吸収して可視光線透過率を低減し、高い眺望性を維持したまま、複層ガラスが頻繁に直面し得る防眩性の問題を解消することができる。 Moreover, when the window material which concerns on this embodiment is a multilayer glass, and an optical body is provided in the surface of the outdoor side of the glass substrate which becomes an outdoor side when it installs in a building etc. as window glass. It is particularly preferable to provide an adhesive layer that absorbs visible light on the surface (more specifically, between the optical body and the glass substrate) of the optical body on the opposite side to the microrelief surface. By providing an adhesive layer that absorbs such visible light, the visible light that passes through the optical body and enters the adhesive layer, passes through the optical body and the adhesive layer, and then on the indoor side surface of the glass substrate on the outdoor side After transmitting through visible light that is reflected and enters the adhesive layer, and through the optical body, the adhesive layer, and the glass substrate on the outdoor side, it is reflected by the glass substrate on the indoor side and transmitted through the glass substrate on the outdoor side to the adhesive layer. It is possible to efficiently absorb incident visible light and the like to reduce the visible light transmittance, and to solve the antiglare problem that double-layered glass can frequently encounter, while maintaining high view.
　次に、実施例及び比較例を挙げて本発明をより具体的に説明するが、本発明は下記実施例に制限されるものではない。 Next, the present invention will be more specifically described by way of examples and comparative examples, but the present invention is not limited to the following examples.
（実施例１～５、比較例１～２）
　ＰＥＴ製の基材（東洋紡株式会社製、「Ａ４３００」、厚み７５μｍ）の上に、微細凹凸構造を有する樹脂層を、アクリル系の紫外線硬化性樹脂を含む組成物を用いて形状転写法により形成し、光学体を得た。このときの微細凹凸層の形成にあたっては、光学体の表面に関する各パラメータ（Ｒａ：算術平均粗さ（μｍ）、ＲＳｍ：粗さ曲線要素の平均長さ（μｍ）、比表面積）が表１に示される値となるよう、原盤の表面形状を変更するなど、形状転写法の条件を適宜調整した。次いで、このＰＥＴ基材の、樹脂層を形成した面とは反対側の面に、粘着層（基材レス両面粘着テープ、日栄化工株式会社製「ＭＨＭ－ＦＷ２５」、厚み２５μｍ）を積層した後、厚み３ｍｍの青板ガラス（ＪＩＳ　Ｒ３２０２で規定されるフロート板ガラス）に貼合した。 (Examples 1 to 5, Comparative Examples 1 to 2)
A resin layer having a fine concavo-convex structure is formed on a PET base material (Toyobo Co., Ltd., “A4300”, 75 μm thick) by a shape transfer method using a composition containing an acrylic UV curable resin And got an optical body. In forming the fine uneven layer at this time, each parameter (Ra: Arithmetic average roughness (μm), RSm: average length of roughness curvilinear element, specific surface area) concerning the surface of the optical body is shown in Table 1 The conditions of the shape transfer method were appropriately adjusted such as changing the surface shape of the master so as to obtain the values shown. Then, after laminating an adhesive layer (substrate-less double-sided adhesive tape, “MHM-FW25” manufactured by Niei Kako Co., Ltd., 25 μm thickness) on the surface of this PET substrate opposite to the surface on which the resin layer is formed And 3 mm thick blue plate glass (float plate glass specified in JIS R3202).
　このようにして得られた、青板ガラスが貼合された光学体（窓材）について、以下の方法で、算術平均粗さＲａ、粗さ曲線要素の平均長さＲＳｍ及び比表面積の測定、ヘイズの測定を行うとともに、防眩性及び眺望性の評価を行った。 With respect to the thus obtained optical body (window material) to which blue plate glass is bonded, measurement of arithmetic average roughness Ra, average length RSm of roughness curvilinear element and specific surface area by the following method, haze And the evaluation of antiglare property and viewability.
＜算術平均粗さＲａ、粗さ曲線要素の平均長さＲＳｍ、比表面積の測定＞
　キヤノン株式会社製「ＮｅｗＶｉｅｗ７３００」を用い、ＩＳＯ２５１７８、ＪＩＳ　Ｂ０６０１に準拠して、微細凹凸表面の算術平均粗さＲａ、粗さ曲線要素の平均長さＲＳｍ、比表面積（単位領域における、当該領域の面積に対する表面積の割合）を測定した。具体的な条件としては、ソフトウエア：MtroPro 8.3.5、Acquisition Mode：Scan、Scan Type：Bipolar、ズームレンズ：２倍、対物レンズ：２００倍、モード：High 2G、面補正：Cylinder、Camera Mode：６４０×４８０　２１０Ｈｚとした。なお、上記測定は、微細凹凸表面から任意に選択される３５．３μｍ×２６．５μｍの長方形領域において行った。結果を表１に示す。 Arithmetic mean roughness Ra, mean length RSm of roughness curvilinear element, measurement of specific surface area>
Arithmetic mean roughness Ra of fine asperity surface, mean length RSm of roughness curvilinear element, specific surface area (area of the relevant area (area in the unit area) using “NewView 7300” manufactured by Canon Inc. in accordance with ISO 25178, JIS B0601 The ratio of surface area to) was measured. Specific conditions include software: MtroPro 8.3.5, Acquisition Mode: Scan, Scan Type: Bipolar, zoom lens: 2 ×, objective lens: 200 ×, mode: High 2G, surface correction: Cylinder, Camera Mode: It was set to 640 × 480 210 Hz. In addition, the said measurement was performed in the 35.3 micrometers x 26.5 micrometers rectangular area | region arbitrarily selected from the fine uneven | corrugated surface. The results are shown in Table 1.
＜ヘイズの測定＞
　日本電色工業株式会社製「ＮＤＨ　７０００ＳＰ」を用い、ＪＩＳ　Ｋ７１３６に準拠して、全ヘイズ及び内部ヘイズを測定した。結果を表１に示す。 <Measurement of Haze>
The total haze and the internal haze were measured according to JIS K7136 using "NDH 7000 SP" manufactured by Nippon Denshoku Kogyo Co., Ltd. The results are shown in Table 1.
＜防眩性の評価＞
　青板ガラスが貼合された光学体（窓材）を、青板ガラスが下になるように平面上に置き、携帯型光沢度計（ＢＹＫガードナー社製「マイクログロス」）を用い、ＪＩＳ　Ｚ８７４１に準拠して、測定角２０°における光沢度Ｇを測定した。なお、光学体が置かれる平面には、無反射板（株式会社きもと製、カーボンフェザー１８８Ｘ１Ｂ）を敷き、下地の影響を最小限となるようにした。この光沢度Ｇの値から、以下の基準に従い、防眩性の評価を行った。結果を表１に示す。
　光沢度Ｇが、３０以下・・・◎
　光沢度Ｇが、３０超で４０以下・・・〇
　光沢度Ｇが、４０超・・・× <Evaluation of antiglare property>
The optical body (window material) to which blue plate glass is bonded is placed on a flat surface so that the blue plate glass is at the bottom, using a portable gloss meter ("Micro Gloss" manufactured by BYK Gardner), in accordance with JIS Z8741 Then, the glossiness G at a measurement angle of 20 ° was measured. A non-reflecting plate (made by KIMOTO CO., LTD., Carbon feather 188X1B) was placed on the plane on which the optical body was placed to minimize the influence of the base. From the value of the glossiness G, the antiglare property was evaluated according to the following criteria. The results are shown in Table 1.
Gloss degree G is 30 or less ・ ・ ・
Gloss degree G is more than 30 and 40 or less · · · Gloss degree G is more than 40 · · · ×
＜眺望性の評価＞
　タッチパネル式写像性測定器（スガ試験機株式会社製「ＩＣＭ－１Ｔ」）を用い、ＪＩＳ　Ｋ７３７４に準拠して、青板ガラスが貼合された光学体（窓材）の、光学櫛幅２ｍｍにおける透過像鮮明度Ｔ（％）を測定した。この透過像鮮明度Ｔの値から、以下の基準に従い、眺望性の評価を行った。結果を表１に示す。
　透過像鮮明度Ｔが、７０％以上・・・◎
　透過像鮮明度Ｔが、５０％以上７０％未満・・・〇
　透過像鮮明度Ｔが、５０％未満・・・× <Evaluation of view>
Transmission of an optical body (window material) to which blue plate glass is bonded according to JIS K 7374 using a touch panel image clarity measuring apparatus (“ICM-1T” manufactured by Suga Test Instruments Co., Ltd.) at an optical comb width of 2 mm The image definition T (%) was measured. From the value of the transmitted image definition T, the view was evaluated according to the following criteria. The results are shown in Table 1.
Transmission image definition T is 70% or more ◎
Transmission image definition T is 50% or more and less than 70% ····· Transmission image definition T is less than 50% ··· ×
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１より、実施例１～５では、Ｒａが０．２μｍ以下である上、ＲＳｍ及び比表面積の少なくともいずれかが所定範囲内であるため、防眩性と眺望性との両立を図ることができていることが分かる。 From Table 1, in Examples 1 to 5, Ra is 0.2 μm or less, and at least one of RSm and the specific surface area is within the predetermined range, so it is possible to achieve both the antiglare property and the viewability. I know that I can do it.
　本発明によれば、防眩性及び眺望性に優れる光学体、並びに、防眩性及び眺望性に優れる窓材を提供することができる。 According to the present invention, it is possible to provide an optical body excellent in antiglare property and viewability, and a window material excellent in antiglare property and viewability.
１　形状転写装置
２　原盤
２３　微細凹凸構造
５１　基材供給ロール
５２　巻取ロール
５３，５４　ガイドロール
５５　ニップロール
５６　剥離ロール
５７　塗布装置
５８　光源
６０　光学体
６１　基材
６２　樹脂層
６３　微細凹凸層
６４　第１透明無機層
６５　第２透明無機層
６６　第３透明無機層
８０　窓材
８１，８２，８３　ガラス基板
８４　粘着層
８５　スペーサー DESCRIPTION OF SYMBOLS 1 shape transfer device 2 master 23 fine concavo-convex structure 51 base material supply roll 52 winding roll 53, 54 guide roll 55 nip roll 56 peel roll 57 coating device 58 light source 60 optical body 61 base 62 resin layer 63 fine concavo-convex layer 64 Transparent inorganic layer 65 second transparent inorganic layer 66 third transparent inorganic layer 80 window material 81, 82, 83 glass substrate 84 adhesive layer 85 spacer

Claims (6)

  1. 　微細凹凸層を備える光学体であって、
    　微細凹凸表面の３５．３μｍ×２６．５μｍの長方形領域において、
    　　算術平均粗さＲａが０．２μｍ以下であり、且つ、
    　　粗さ曲線要素の平均長さＲＳｍが１０μｍ以下であるか、又は、当該長方形の面積に対する表面積の割合が１．０４以上１．５以下である、
    ことを特徴とする、光学体。     An optical body comprising a fine uneven layer,
    In the 35.3 μm × 26.5 μm rectangular area of the fine uneven surface,
    Arithmetic mean roughness Ra is 0.2 μm or less, and
    The average length RSm of the roughness curvilinear element is 10 μm or less, or the ratio of the surface area to the area of the rectangle is 1.04 or more and 1.5 or less.
    An optical body characterized by
  2. 　第１透明無機層と、第２透明無機層とを更に備え、
    　前記第１透明無機層は、前記微細凹凸層の微細凹凸表面上に配置され、前記第２透明無機層は、前記第１透明無機層上に配置される、請求項１に記載の光学体。     Further comprising a first transparent inorganic layer and a second transparent inorganic layer,
    The optical body according to claim 1, wherein the first transparent inorganic layer is disposed on the surface of the fine asperity layer of the fine asperity layer, and the second transparent inorganic layer is disposed on the first transparent inorganic layer.
  3. 　前記第１透明無機層が、ＺｎＯ及びＣｅＯ2の少なくともいずれかを含有し、
    　前記第２透明無機層が、ＳｉＯ2、ＳｉＮ、ＳｉＯＮ及びＭｇＦ2の少なくともいずれかを含有する、請求項２に記載の光学体。     The first transparent inorganic layer contains at least one of ZnO and CeO 2 ,
    The optical body according to claim 2, wherein the second transparent inorganic layer contains at least one of SiO 2 , SiN, SiON and MgF 2 .
  4. 　全ヘイズが１５％以上６０％以下であり、内部ヘイズが４％以下であり、測定角２０°における光沢度が４０以下であり、且つ、光学櫛幅２ｍｍにおける透過像鮮明度が５０％以上である、請求項１～３のいずれかに記載の光学体。 Total haze is 15% or more and 60% or less, internal haze is 4% or less, glossiness at a measurement angle of 20 ° is 40 or less, and transmission image clarity at an optical comb width of 2 mm is 50% or more The optical body according to any one of claims 1 to 3.
  5. 　前記第２透明無機層上に第３透明無機層を更に備える、請求項２～４のいずれかに記載の光学体。 The optical body according to any one of claims 2 to 4, further comprising a third transparent inorganic layer on the second transparent inorganic layer.
  6. 　ガラス基板と、請求項１～５のいずれかに記載の光学体とを備える、ことを特徴とする、窓材。 A window material comprising a glass substrate and the optical body according to any one of claims 1 to 5.
PCT/JP2018/031022 2017-09-26 2018-08-22 Optical body and window material WO2019065009A1 (en)

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