TW201915521A - Optical body and window material - Google Patents

Optical body and window material

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Publication number
TW201915521A
TW201915521A TW107132842A TW107132842A TW201915521A TW 201915521 A TW201915521 A TW 201915521A TW 107132842 A TW107132842 A TW 107132842A TW 107132842 A TW107132842 A TW 107132842A TW 201915521 A TW201915521 A TW 201915521A
Authority
TW
Taiwan
Prior art keywords
optical body
transparent inorganic
layer
inorganic layer
less
Prior art date
Application number
TW107132842A
Other languages
Chinese (zh)
Inventor
和田豊
Original Assignee
日商迪睿合股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2017-184958 priority Critical
Priority to JP2017184958A priority patent/JP2019061026A/en
Application filed by 日商迪睿合股份有限公司 filed Critical 日商迪睿合股份有限公司
Publication of TW201915521A publication Critical patent/TW201915521A/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered 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
    • B32B7/02Physical, chemical or physicochemical properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00Layered 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
    • B32B7/02Physical, chemical or physicochemical properties
    • B32B7/023Optical properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00Layered products comprising a particular substance not covered by groups B32B11/00 - B32B29/00
    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06BFIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00Window 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
    • E06B3/70Door leaves
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/02Diffusing elements; Afocal elements

Abstract

The present invention provides an optical body excellent in antiglare property and high visibility. The optical body is characterized in that the fine uneven layer and the rectangular region of 35.3 μm × 26.5 μm of the fine uneven surface have an arithmetic mean roughness Ra of 0.2 μm or less and an average length RSm of the roughness curve element of 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.

Description

Optical body and window material

The present invention relates to an optical body and a window material, and more particularly to an optical body which has high anti-glare property and high-definition property, and a window material including an optical body.

In recent years, in buildings including high-rise buildings, high-rise apartments, and the like, it is often a problem that the glazing of the mounted window glass is reflected, and the so-called reflected light that causes glare to the users of other neighboring buildings frequently becomes a problem. Therefore, it is required to take sufficient countermeasures against the reflected light hazard during the construction of the building.

Here, as a measure of the glare of the reflected light of the window glass of a building, the method of arranging a louver, etc. on the wall surface of a building, and blocking the reflected light is mentioned, for example. However, with regard to the setting of the blinds, the project is large-scale and costly, and it also affects the design of the building, so most of the owners respect it.

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

For example, as a film which can improve the reflection property including the anti-glare property, Patent Document 1 discloses that an optical film can be obtained by using an ultraviolet curable resin on a base film to randomly form an antiglare having an uneven shape surface. The AG) layer is formed with a layer containing a low refractive index resin in such a manner that the uneven shape is flat, whereby the reflectance in the visible light region can be made gentle, and the black color can be made conspicuous when attached to the display.

Further, Patent Document 2 discloses that a film obtained by using an ultraviolet curable resin on a base film and transferring the unevenness on the surface of the mold to obtain a film is used, and after hitting the sandblasted particles having a predetermined particle diameter, The surface of the mold, thereby maintaining high transmission clarity and reducing glare. [Prior Art Document] [Patent Literature]

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

[Problems to be Solved by the Invention] However, the conventional films are mainly used for a polarizing plate provided on a display surface of a liquid crystal panel such as a personal computer or a liquid crystal television. Further, the conventional film has room for improvement in terms of use of a window glass and a combination of high anti-glare property and high-definition property.

An object of the present invention is to solve the various problems described above and achieve the following objects. That is, an object of the present invention is to provide an optical body excellent in antiglare property and high visibility, and a window material excellent in antiglare property and high visibility. [Means for solving the problem]

In order to achieve the above object, the inventors of the present invention have not been limited to a film, and have conducted intensive studies. As a result, it has been found that the present invention can be achieved by achieving high roughness and anti-glare properties by optimizing the roughness characteristics of the fine uneven surface.

The present invention has been made based on the above findings of the present inventors, and the means for solving the above problems are as follows. In other words, <1> an optical body comprising a fine uneven layer, wherein the optical body is characterized by an arithmetic mean roughness Ra of 0.2 μm or less in a rectangular region of 35.3 μm × 26.5 μm of the fine uneven surface, and roughness The average length RSm of the curved element is 10 μm or less, or the ratio of the surface area to the area of the rectangular shape is 1.04 or more and 1.5 or less.

The optical body according to the above aspect, further comprising a first transparent inorganic layer and a second transparent inorganic layer, wherein the first transparent inorganic layer is disposed on a fine uneven surface of the fine uneven layer, The second transparent inorganic layer is disposed on the first transparent inorganic layer.

The optical body according to the above [2], wherein the first transparent inorganic layer contains at least one of ZnO and CeO 2 , and the second transparent inorganic layer contains SiO 2 , SiN, SiON, and MgF. At least either of 2 .

The optical body according to any one of <1> to <3> wherein the total haze is 15% or more and 60% or less, the internal haze is 4% or less, and the measurement angle is 20°. The glossiness is 40 or less, and the transmission image resolution at a comb width of 2 mm is 50% or more.

The optical body according to any one of <2> to <4>, further comprising a third transparent inorganic layer on the second transparent inorganic layer.

<6> A window material, comprising: a glass substrate, and the optical body according to any one of <1> to <5>. [Effects of the Invention]

According to the present invention, the above-described various problems are solved, and the object can be attained, and an optical body excellent in anti-glare property and high-predictability, and a window material excellent in anti-glare property and high-predictability can be provided.

(Optical body) As shown in Fig. 1, an optical body (hereinafter, referred to as "the optical body of the present embodiment") 60 according to an embodiment of the present invention includes at least a fine uneven layer 63. Further, the optical body of the present embodiment may further include a first transparent inorganic layer, a second transparent inorganic layer, a third transparent inorganic layer, an antifouling coating layer, and other layers, as needed.

<Micro-concave 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.

The fine uneven surface of the fine uneven layer has an arithmetic mean roughness Ra of 0.2 μm or less in a rectangular region of 35.3 μm × 26.5 μm. Further, in the fine uneven surface of the fine uneven layer, the average length RSm of the roughness curve element in the rectangular region is 10 μm or less, or the area with respect to the rectangle (that is, 35.3 μm × 26.5 μm = 935.45 μm 2 ) The ratio of the surface area (μm 2 ) (hereinafter sometimes referred to as "specific surface area") is 1.04 or more and 1.5 or less. The inventors of the present invention have found that the arithmetic mean roughness Ra of the fine uneven surface is 0.2 μm or less, and the average length RSm and/or specific surface area of the roughness curve element is within the above range. The unevenness of the shape having a smaller wavelength than the visible light region is formed, and a part of the light is transmitted without changing the traveling direction, whereby the transparency of the transmitted image can be improved, and an optical body having both anti-glare property and high-definition property can be obtained.

In addition, the fine uneven surface of the fine uneven layer is preferably an average length RSm of the roughness curve element of 10 μm or less and a specific surface area of 1.04 or more and 1.5 or less.

The arithmetic mean roughness Ra of the fine uneven surface of the fine uneven layer is preferably 0.18 μm or less, and more preferably 0.14 μm or less, from the viewpoint of the high anti-glare property and the high-precision property. On the other hand, the arithmetic mean roughness Ra of the fine uneven surface of the fine uneven layer is preferably 0.08 μm or more, and more preferably 0.09 μm or more, from the viewpoint of further improving the anti-glare property.

In addition, from the viewpoint of further improving the image clarity, the average length RSm of the roughness curve elements of the fine uneven surface of the fine uneven layer is preferably 6 μm or less. In addition, the average length RSm of the roughness curve element of the fine uneven surface of the fine uneven layer is preferably 2 μm or more from the viewpoints of the higher anti-glare property and the viewpoint of the anti-glare property and the improvement of the physical strength of the fine unevenness. .

In addition, the specific surface area of the fine uneven surface of the fine uneven layer is preferably 1.1 or more from the viewpoint of further improving the anti-glare property. In addition, the specific surface area of the fine uneven surface of the fine uneven layer is preferably 1.4 or less from the viewpoint of further improving the visibility.

The Ra, RSm and specific surface area can be determined by the method used in the examples.

Here, the fine uneven layer can be formed, for example, by 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. 2 .

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

The substrate supply roller 51 is a roller that winds the sheet-like base material 61 in a roll shape, and the winding roller 52 is a roller that winds up the base material 61 in which the resin layer 62 on which the fine uneven structure 23 is transferred is laminated. Further, the guide roller 53 and the guide roller 54 are rollers that convey the substrate 61. The nip roller 55 is a roller that adheres the base material 61 in which the resin layer 62 is laminated to the cylindrical master 2, and the peeling roller 56 is a base in which the resin layer 62 is laminated after transferring the fine uneven structure 23 to the resin layer 62. The material 61 is peeled off from the original disc 2. Here, the base material 61 can be, for example, a plastic base material such as polyethylene terephthalate (PET) resin or polycarbonate resin, and can be a transparent film made of plastic.

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

The ultraviolet curable resin is a resin which is reduced in fluidity by irradiation with ultraviolet rays and is cured, and specific examples thereof include an acrylic resin. Further, the ultraviolet curable resin composition may contain an initiator, a filler, a functional additive, a solvent, an inorganic material, a pigment, an antistatic agent, or a sensitizing dye, as needed.

In the shape transfer device 1, first, the sheet-like base material 61 is continuously fed from the substrate supply roller 51 via the guide roller 53. The ultraviolet curable resin composition is applied onto the fed substrate 61 by the coating device 57, and the resin layer 62 is laminated on the substrate 61. Further, the base material 61 in which the resin layer 62 is laminated is in close contact with the original disk 2 by the nip roller 55. Thereby, 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 irradiation of light from the light source 58. Then, the base material 61 in which the hardened resin layer 62 is laminated is peeled off from the original disk 2 by the peeling roller 56, and is taken up by the take-up roll 52 via the guide roll 54. According to such a shape transfer device 1, a fine uneven layer having a fine uneven surface can be continuously formed. Here, Ra, RSm, and 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 .

Further, in the shape transfer method, a base material and an ultraviolet curable resin are prepared, and a fine uneven layer is formed on the substrate using the resin (that is, as shown in FIG. 1, the fine uneven layer 63 includes the substrate 61 and The resin layer 62) having a fine concavo-convex structure is not limited thereto, and may be formed directly on a substrate containing a resin such as an ultraviolet curable resin or a thermosetting resin. The uneven structure (that is, as shown in FIG. 3, the fine uneven layer 63 includes only the substrate 61).

<First transparent inorganic layer> As shown in FIG. 4, the optical body 60 of the present embodiment preferably includes the first transparent inorganic layer 64 on the fine uneven surface of the fine uneven layer 63. The first transparent inorganic layer 64 has transparency and may have a function of absorbing light of a predetermined wavelength, for example. Further, the first transparent inorganic layer 64 can be formed by, for example, a sputtering method or a chemical vapor deposition (CVD) method. In addition, in this specification, "transparent" or "transparent" means that an image can be clearly seen through an optical body through a high image clarity.

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 indicates the wavelength of the absorption end, and broadly indicates light having a wavelength lower than the wavelength corresponding to the band gap, and transmits light having a wavelength equal to or higher than the band gap. Further, the band gap of 2.8 eV or more and 4.8 eV or less represents a wavelength λ and a band gap energy E obtained according to the PIanck constant (6.626 × 10 -34 J·s) and the speed of light (2.998 × 10 8 m/s). The relationship: "λ (nm) = 1240 / E (eV)", which is approximately the wavelength of the absorption end in the range of the ultraviolet region and the visible region, that is, the range of 260 nm or more and 440 nm or less. Therefore, by using the inorganic compound in the first transparent inorganic layer, transparency and ultraviolet absorption characteristics can be achieved. In the same manner, 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 (about 340 nm or more and 420 nm or less in terms of wavelength). In addition, the main component of the first transparent inorganic layer is preferably 3.0 eV or more and 3.4 eV or less (about 360 nm or more in terms of wavelength), in order to reduce the thickness of the first transparent inorganic layer. And a band gap inorganic compound of 420 nm or less. In addition, the "main component" in this specification means the component with the most content.

Further, 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 , ln 2 O 3 , Nb 2 O 5 , Ta 2 O 5 , SiC. , ZnS, etc. In addition, 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, ZnS, and the like. Further, 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 view 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. In the present specification, "CeO 2 " is defined to include CeO 2 (sometimes collectively referred to as CeGdO 2 ) (Ce 0.9 Gd 0.1 O 2 or the like) doped with ytterbium (Gd), by 钐 (Sm) It was doped CeO 2, and CeO 2 were doped by other elements. Further, these inorganic compounds may be used alone or in combination for the first transparent inorganic layer, or two or more of them may be used in combination for the first transparent inorganic layer.

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 absorption characteristics can be obtained, and by 400 nm or less, the risk of deterioration in productivity or generation of cracks can be suppressed. From the same viewpoint, the thickness of the first transparent inorganic layer is more preferably 100 nm or more, and still more preferably 300 nm or less.

<Second Transparent Inorganic Layer> As shown in FIG. 4, the optical body 60 of the present embodiment preferably includes a second transparent inorganic layer 65 on the first transparent inorganic layer 64 in addition to the first transparent inorganic layer 64. . By including the second transparent inorganic layer, it is possible to prevent adhesion of dirt due to rain or the like to the first transparent inorganic layer. The second transparent inorganic layer has transparency, may be water repellency or hydrophilic, and may be formed, for example, by a sputtering method or a CVD method.

The main component of the second transparent inorganic layer preferably has a larger band gap than the main component of the first transparent inorganic layer, and more specifically, a band having a main component of the first transparent inorganic layer. An inorganic compound having a 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, and is preferably 4.0 eV or more, in addition to the improvement of the antifouling property of the first transparent inorganic layer. The anti-glare property of the obtained optical body is improved. Specifically, examples of the main component of the preferred second transparent inorganic layer include inorganic compounds such as SiO 2 , SiN, SiON, and MgF 2 . In other words, the second transparent inorganic layer preferably contains at least one of SiO 2 , SiN, SiON, and MgF 2 . Further, the second transparent inorganic layer more preferably contains at least SiO 2 . These inorganic compounds may be used alone for the second transparent inorganic layer, or two or more of them may be used in combination for the second transparent inorganic layer.

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 anti-glare property can be more effectively improved. From the same viewpoint, the thickness of the second transparent inorganic layer is more preferably 40 nm or more, and still more preferably 100 nm or less.

Further, as shown in FIG. 5, the optical body of the present embodiment is preferably further included on the second transparent inorganic layer 65 in addition to the first transparent inorganic layer 64 and the second transparent inorganic layer 65. The third transparent inorganic layer 66. By including the third transparent inorganic layer, deterioration of the first transparent inorganic layer and the second transparent inorganic layer by chemicals can be suppressed. The third transparent inorganic layer has transparency, may be water repellency or hydrophilic, and may be formed, for example, by a sputtering method or a CVD method.

The third transparent inorganic layer may contain at least one of SiO 2 , SiN, SiON, and MgF 2 as a main component. Further, the third transparent inorganic layer preferably further contains ZrO 2 , Nb 2 O 5 or SnO 2 as an additional component. Further, the ratio of the additional component in the third transparent inorganic layer is preferably 6% by mass or more and 50% by mass or less. When the ratio of the additional component is 6% by mass or more, the effect of improving the chemical resistance can be sufficiently obtained, and if it is 50% by mass or less, the refractive index difference with the second transparent inorganic layer can be appropriately maintained. Difficulties in optical design can be avoided. From the same viewpoint, the ratio of the additional component in the third transparent inorganic layer is more preferably 13% by mass or more, further preferably 20% by mass or more, and more preferably 30% by mass or less. The additional components may be used singly or in combination of two or more.

The thickness of the third transparent inorganic layer is preferably 20 nm or more. By the thickness of the third transparent inorganic layer being 20 nm or more, sufficiently high chemical resistance can be obtained. Further, the thickness of the third transparent inorganic layer is preferably 200 nm or less. When the thickness of the third transparent inorganic layer is 200 nm or less, the risk of deterioration in productivity or generation of cracks can be suppressed. From the same viewpoint, the thickness of the third transparent inorganic layer is more preferably 100 nm or less.

<Antifouling coating layer> The optical body of the present embodiment preferably includes an antifouling coating layer on the outermost surface of one side of the fine uneven surface of the fine uneven layer. Specifically, the optical body of the present embodiment preferably includes an antifouling coating layer on the fine uneven layer, the second transparent inorganic layer, or the third transparent inorganic layer. By including an antifouling coating, the adhesion of dirt to the optical body can be reduced, and the adhered dirt can be easily dropped, so that the optical body can exert desired properties for a longer period of time. Further, from the viewpoint of high adhesion, it is preferred to include an antifouling coating layer on the second transparent inorganic layer or the third transparent inorganic layer containing SiO 2 as a main component.

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

The thickness of the antifouling coating is preferably 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 improved, and by 20 nm or less, the embedding of the uneven structure of the fine concavo-convex layer can be avoided.

<Other Layers> The optical body of the present embodiment is not particularly limited, and may include other layers than the layers. For example, in order to firmly adhere the fine uneven layer and the first transparent inorganic layer, the optical body of the present embodiment may include an adhesion layer between the layers. Examples of the adhesion layer include an SiO x layer, 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 a sputtering method or a CVD method.

Further, in the optical body of the present embodiment, it is preferable that the surface of the fine uneven layer on the side opposite to the fine uneven surface includes an adhesive layer that absorbs visible light. The surface of the opposite side of the fine uneven surface includes an adhesive layer that absorbs visible light, and the glass substrate 81 is laminated on the surface of the optical body including the surface of the adhesive layer 84 as shown in FIG. The visible light that has passed through (the arbitrary first transparent inorganic layer 64 and the fine uneven layer 63) and is incident on the adhesive layer 84 is efficiently absorbed, and the (except first transparent inorganic layer 64) fine fine uneven layer 63 and the adhesive layer 84 are transmitted. Then, the visible light transmittance is reflected by the glass substrate 81 and is incident on the adhesive layer 84 to reduce the visible light transmittance, and the anti-glare property is further improved while maintaining high visibility. In addition, by using an adhesive layer having different visible light absorption rates, there is also an advantage that the product series having different gloss levels can be easily aligned. Further, the adhesive layer that absorbs visible light can be prepared, for example, by dispersing a coloring agent such as a dye or a pigment that absorbs visible light in an adhesive material in an arbitrary ratio. On the other hand, for example, when there are many cases where the ratio of the dye or the pigment which absorbs visible light is large, the adhesive force is lowered, or the durability is deteriorated, the visible light-absorbing substrate or DLC containing a coloring agent such as a dye or a pigment can be used. An inorganic film that absorbs visible light is deposited on the fine uneven layer.

<Characteristics of Optical Body> The gloss of the optical body of the present embodiment at a measurement angle of 20° is preferably 40 or less. When the gloss at a measurement angle of 20° is 40 or less, the antiglare property of the optical body can be sufficiently high. From the same viewpoint, the gloss of the optical body at a measurement angle of 20° is more preferably 30 or less, and still more preferably 20 or less. Further, the gloss at a measurement angle of 20 ° of the optical body can be measured by the method used in the examples.

The optical image of the present embodiment preferably has a transmission image resolution of 50% or more at a comb width of 2 mm. The transparency of the optical body is sufficiently high by the transparency of the image of the optical comb having a width of 2 mm of 50% or more. From the same viewpoint, the transparency of the optical body having a light comb width of 2 mm is preferably 70% or more, and more preferably 80% or more. Further, the transmission image sharpness at an optical comb width of 2 mm of the optical body can be measured by the method used in the examples.

The total haze of the optical body of the present embodiment is preferably 15% or more and 60% or less. By having a total haze of 15% or more, the anti-glare property can be effectively improved, and by being 60% or less, the expectation can be effectively improved. From the same viewpoint, the total haze of the optical body is more preferably 50% or less. Further, the internal haze of the optical body of the present embodiment is preferably 4% or less. By having an internal haze of 4% or less, the desire can be further improved. From the same viewpoint, the internal haze of the optical body is more preferably 2% or less. Further, the total haze and internal haze of the optical body can be determined by the method used in the examples.

Further, the optical body of the present embodiment preferably has a light transmittance at a wavelength of 320 nm of 10% or less, more preferably 6% or less, and still more preferably 3% or less. When the light transmittance of the optical body at a wavelength of 320 nm is 10% or less, deterioration such as yellowing of the substrate due to ultraviolet rays can be effectively suppressed, and the adhesion durability between the substrate and the resin layer can be improved. In addition, the light transmittance of the optical body at a wavelength of 320 nm 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 of the present embodiment") includes a glass substrate and the optical body. Specifically, as shown in FIG. 7 , the window member 80 of the present embodiment can be such that the optical body 60 and the glass substrate 81 face the glass substrate 81 on the surface opposite to the fine uneven surface of the optical body 60 . The way to build a layer. As described above, the window material of the present embodiment includes at least the optical body, and is excellent in both anti-glare property and glare property. Therefore, it can be preferably used as a window glass for a building such as a high-rise building or a house, a window glass for a vehicle, or the like. Furthermore, the window material of the present embodiment may include the optical body only on one side of the glass substrate, or may include the optical body on both sides.

Further, by the same considerations as the optical body, the glossiness at a measurement angle of 20° in the window material of the present embodiment, the transmission image sharpness at a comb width of 2 mm, the total haze, and the internal haze The preferred range of light transmittance at a wavelength of 320 nm and the preferred reason for this range are the same as those described for the optical body, respectively.

The window material of this embodiment may be a multi-layer glass. In general, the multi-layer glass has poor anti-glare properties compared to the single-layer glass. However, since the window material of the present embodiment includes the optical body, even if it is a multi-layer glass, it can provide high anti-glare property.

Here, the multilayer glass, as shown in (a) to (h) of FIG. 8 , generally means that a plurality of glass substrates ( 82 , 83 ) are laminated on the periphery of the spacer 85 and laminated on each of the glass substrates. A glass that forms a space between the structures. In addition, as the window glass of the present embodiment, as the window glass, when the window glass is installed in a building or the like, it can be provided only on the outdoor side surface of the glass substrate 82 on the outdoor side, as shown in Fig. 8 (a). As shown in (b) to (d) of FIG. 8, the optical body 60 can be provided with the optical body 60 on the outdoor side surface of the glass substrate 82 on the outdoor side, and also on one side of the glass substrate 83 on the indoor side. The optical body 60 is provided on both sides, and as shown in FIGS. 8(e) to 8(h), an optical body can be provided on both surfaces of the outdoor glass substrate 82, and the glass substrate can be arbitrarily placed on the indoor side. The optical body 60 is provided on one side and/or both sides of the 83.

In addition, when the window material of the present embodiment is a multi-layer glass, and the window glass is installed in a building or the like, when an optical body is provided on the outdoor side surface of the glass substrate on the outdoor side, the optical body is particularly preferable. The surface opposite to the fine uneven surface (more specifically, between the optical body and the glass substrate) includes an adhesive layer that absorbs visible light. By including such an adhesive layer that absorbs visible light, it is possible to efficiently absorb visible light that has passed through the optical body and entered the adhesive layer, and transmitted through the optical body and the adhesive layer, and then reflected on the indoor surface of the outdoor glass substrate and incident thereon. The visible light of the adhesive layer and the glass substrate passing through the optical body, the adhesive layer, and the outdoor side are reflected by the glass substrate on the indoor side, and transmitted through the glass substrate on the outdoor side and incident on the visible light of the adhesive layer to reduce the visible light transmittance. Eliminate the problem of anti-glare that can be frequently faced by multi-layer glass while maintaining a high degree of hope. [Examples]

Next, the present invention will be specifically described by way of examples and comparative examples, but the present invention is not limited to the following examples.

(Examples 1 to 5, Comparative Example 1 to Comparative Example 2) A resin layer having a fine uneven structure was formed on a PET substrate by a shape transfer method using a composition containing an acrylic ultraviolet curable resin ( Manufactured by Toyobo Co., Ltd., "A4300", thickness 75 μm), to obtain an optical body. When the fine uneven layer at this time is formed, each parameter (Ra: arithmetic mean roughness (μm), RSm: average length (μm) of the roughness curve element, specific surface area) relating to the surface of the optical body is shown in Table 1. The condition of the value shown is such that the surface shape of the original disk is changed, and the conditions of the shape transfer method are appropriately adjusted. Then, an adhesive layer ("MSM-FW25" manufactured by Rising Chemical Co., Ltd., thickness: 25 μm) was laminated on the surface of the PET substrate opposite to the surface on which the resin layer was formed. And attached to a blue plate glass with a thickness of 3 mm (floating plate glass specified in JIS R3202).

The optical body (window material) to which the blue plate glass was bonded as described above was subjected to the arithmetic mean roughness Ra, the average length RSm of the roughness curve element, the measurement of the specific surface area, and the measurement of the haze. And the evaluation of anti-glare and expectation.

<Arithmetic Mean Roughness Ra, Average Length RSm of Roughness Curve Element, and Measurement of Specific Surface Area> The arithmetic mean roughness of the fine uneven surface was measured in accordance with ISO25178 and JIS B0601 using "NewView 7300" manufactured by Canon Co., Ltd. Ra, the average length RSm of the roughness curve element, and the specific surface area (ratio of the surface area of the unit area to the area of the area). As a specific condition, it is set as software: MtroPro 8.3.5, acquisition mode: scanning, scanning type: bipolar, zoom lens: 2 times, objective lens: 200 times, mode: High 2G, surface correction: cylinder, camera mode: 640 ×480 210 Hz. Further, the measurement was carried out in a rectangular region of 35.3 μm × 26.5 μm which was arbitrarily selected from the surface of the fine uneven surface. The results are shown in Table 1.

<Measurement of haze> The total haze and internal haze were measured in accordance with JIS K7136 using "NDH 7000SP" manufactured by Nippon Denshoku Industries Co., Ltd. The results are shown in Table 1.

<Evaluation of Anti-glare Property> The optical body (window material) to which the blue-plate glass was bonded was placed on a flat surface with the blue-panel glass facing downward, and a portable gloss meter (BYK Gardner) was used. The "microgloss" manufactured by the company measures the gloss G at a measurement angle of 20° in accordance with JIS Z8741. Further, a non-reflecting plate (carbonfeather 188X1B, manufactured by Kibamoto Co., Ltd.) was placed on the plane on which the optical body was placed to minimize the influence of the substrate. Based on the value of the gloss G, the evaluation of the anti-glare property was performed in accordance with the following criteria. The results are shown in Table 1. Gloss G is 30 or less. ··· Gloss G exceeds 30 and is 40 or less. ··· Gloss G exceeds 40···×

<Evaluation of the expectation> The optical panel (window) to which the blue plate glass is bonded is measured in accordance with JIS K7374 using a touch panel type image measuring device ("ICM-1T" manufactured by Suga Test Machine Co., Ltd.). Transmitting image resolution T (%) at a comb width of 2 mm. Based on the value of the transmitted image sharpness T, the evaluation of the visibility was performed in accordance with the following criteria. The results are shown in Table 1. The transmission resolution T is 70% or more. ··· The transmission resolution T is 50% or more and less than 70%···○ The transmission resolution T is less than 50%···×

[Table 1]

As is clear from Table 1, in Examples 1 to 5, since Ra is 0.2 μm or less and at least one of RSm and specific surface area is within a predetermined range, it is possible to achieve both anti-glare properties and desirable properties. [Industrial availability]

According to the present invention, it is possible to provide an optical body excellent in antiglare property and high visibility, and a window material excellent in antiglare property and high visibility.

1‧‧‧Shape transfer device

2‧‧‧Original

23‧‧‧Micro-concave structure

51‧‧‧Substrate supply roller

52‧‧‧Winding roller

53, 54‧‧‧ Guide rolls

55‧‧‧Clamping roller

56‧‧‧ peeling roller

57‧‧‧ Coating device

58‧‧‧Light source

60‧‧‧Optical body

61‧‧‧Substrate

62‧‧‧ resin layer

63‧‧‧Micro-concave layer

64‧‧‧1st transparent inorganic layer

65‧‧‧2nd transparent inorganic layer

66‧‧‧3rd transparent inorganic layer

80‧‧‧ Window materials

81, 82, 83‧‧‧ glass substrates

84‧‧‧Adhesive layer

85‧‧‧ spacers

1 is a schematic cross-sectional view showing an example of the configuration of an optical body according to an embodiment of the present invention. 2 is a schematic view showing a method for forming an example of a fine uneven layer of an optical body according to an embodiment of the present invention. 3 is a schematic cross-sectional view showing an example of the configuration of an optical body according to an embodiment of the present invention. 4 is a schematic cross-sectional view showing a configuration example of an optical body according to an embodiment of the present invention. FIG. 5 is a schematic cross-sectional view showing a configuration example of an optical body according to an embodiment of the present invention. Fig. 6 is a schematic cross-sectional view showing a configuration example of a window material according to an embodiment of the present invention. Fig. 7 is a schematic cross-sectional view showing a configuration example of a window material according to an embodiment of the present invention. (a) to (h) of FIG. 8 are schematic cross-sectional views showing a configuration example of a window material according to an embodiment of the present invention.

Claims (6)

  1. An optical body comprising a fine uneven layer, wherein the optical body is characterized by: an arithmetic mean roughness Ra of 0.2 μm or less in a rectangular region of 35.3 μm × 26.5 μm of a fine uneven surface, and an average length of a roughness curve element The RSm is 10 μm or less, or the ratio of the surface area to the area of the rectangular shape is 1.04 or more and 1.5 or less.
  2. The optical body according to claim 1, further comprising a first transparent inorganic layer and a second transparent inorganic layer, wherein the first transparent inorganic layer is disposed on a fine uneven surface of the fine uneven layer, The second transparent inorganic layer is disposed on the first transparent inorganic layer.
  3. The optical body according to claim 2, wherein the first transparent inorganic layer contains at least one of ZnO and CeO 2 , and the second transparent inorganic layer contains SiO 2 , SiN, SiON, and MgF 2 . At least either.
  4. The optical body according to any one of the items 1 to 3, wherein the total haze is 15% or more and 60% or less, the internal haze is 4% or less, and the gloss at an angle of 20° is measured. The image clarity of 40 or less and the comb width of 2 mm is 50% or more.
  5. 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. A window material, comprising: a glass substrate, and the optical body according to any one of claims 1 to 5.
TW107132842A 2017-09-26 2018-09-18 Optical body and window material TW201915521A (en)

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Publication number Priority date Publication date Assignee Title
JP2006076829A (en) * 2004-09-09 2006-03-23 Nippon Sheet Glass Co Ltd Anti-fogging article and its producing method
JP4520418B2 (en) * 2005-02-18 2010-08-04 キヤノン株式会社 Optical transparent member and optical system using the same
JP2007015146A (en) * 2005-07-05 2007-01-25 Nissan Motor Co Ltd Laminated resin glass
JP5414324B2 (en) * 2009-03-29 2014-02-12 株式会社日本触媒 Antiglare laminate
WO2010113827A1 (en) * 2009-03-30 2010-10-07 日本製紙ケミカル株式会社 Antiglare hardcoat film
JP5352316B2 (en) * 2009-03-30 2013-11-27 富士フイルム株式会社 Light scattering film, polarizing plate, image display device, and transmissive / semi-transmissive liquid crystal display device
WO2014017425A1 (en) * 2012-07-25 2014-01-30 三菱レイヨン株式会社 Laminate, laminate manufacturing method, electrode, el element, surface light emitter and solar cell

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