WO2018116748A1 - Optical body - Google Patents

Abstract

This optical body comprises a first optical layer having an uneven surface, an inorganic layer arranged on the uneven surface of the first optical layer, and a second optical layer having another uneven surface facing the inorganic layer and arranged such that the uneven portion of said other uneven surface is embedded, wherein the second optical layer is used in contact with an adhesive layer, the water absorbency of the second optical layer is less than or equal to 15.0 mass%, and the tensile elongation at breakage ratio is greater than or equal to 60%.

Description

Optical body

The present invention relates to an optical body.

By attaching to an adherend such as a window glass or a wall, among the sunlight incident at a predetermined angle, the wavelength in the visible light region is incident on the room while the light in the high wavelength region such as infrared is incident. An optical body having a heat ray recursion property that can be rebounded has been developed (see, for example, Patent Document 1).

As shown in FIG. 10, an optical body described in Patent Document 1 is an optical body 100 that is attached to an adherend (external support 107) such as a window glass or a wall, and includes an inorganic layer 101 and an inorganic layer. The first optical layer 102 formed on one surface of 101 (the surface on the side opposite to the external support 107), and the first optical layer 102 formed on the other surface of the inorganic layer 101 (the surface on the external support 107 side). Two optical layers 103, a first substrate 104 formed on one surface of the first optical layer 102 (a surface opposite to the external support 107), and one of the second optical layers 103 The second substrate 105 is formed on the surface (the surface on the external support 107 side). Then, the optical body 100 is attached to the external support 107 through the adhesive layer 106. The optical body 100 has sufficient transparency.

From the viewpoint of reducing the thickness of the optical body and reducing the manufacturing process, studies have been made to omit the second base material 105 formed between the external support 107 such as window glass and walls and the second optical layer 103. (For example, refer to Patent Document 2).

JP 2011-128512 A JP 2011-212892 A

In the optical body of FIG. 10, the present invention omits the second base material 105 formed between the external support 107 and the second optical layer 103, and eliminates the second optical layer 103 and the adhesive layer 106. When the adhesive layer 106 is attached to the external support 107 by water application, the second optical layer 103 gradually becomes cloudy and the transparent image definition is lowered.
On the other hand, in the optical body stuck on a window glass, the function as what is called a glass scattering prevention film is calculated | required.

This invention makes it a subject to achieve the following objectives. That is, the present invention provides an optical body that functions as a glass scattering prevention film and can suppress a decrease in transmitted image clarity due to water sticking when the second optical layer and the adhesive layer are laminated in contact with each other. Objective.

Means for solving the above problems are as follows. That is,
<1> a first optical layer having an uneven surface;
An inorganic layer disposed on the uneven surface of the first optical layer;
A second optical layer having another uneven surface on the inorganic layer side and disposed so that the unevenness on the other uneven surface is buried;
Have
The second optical layer is used in contact with the adhesive layer;
The water absorption of the second optical layer is 15.0 mass% or less;
An optical body characterized by having an elongation at break of 60% or more.
<2> The optical body according to <1>, wherein a transmitted image clarity of a 2.0 mm optical comb measured in accordance with JIS K-7374: 2007 satisfies the following relational expression (1).
−3.0 ≦ T (2.0) ₇₂ −T (2.0) ₀ ≦ 3.0... (1)
Here, T (2.0) ₀ represents the transmitted image clarity of the optical body. T (2.0) ₇₂ represents the transmitted image definition when the optical body is bonded to glass by water bonding using the adhesive layer and 72 hours have elapsed after the water bonding.
<3> The transmitted image definition of an optical comb of 0.5 mm measured according to JIS K-7374: 2007 satisfies any of the following relational expressions (2): <1> to <2> It is an optical body.
−3.0 ≦ T (0.5) ₇₂ −T (0.5) ₀ ≦ 3.0... Relational expression (2)
Here, T (0.5) ₀ represents the transmitted image clarity of the optical body. T (0.5) ₇₂ represents the transmitted image clarity when 72 hours have passed after the optical body is bonded to the glass by water bonding using the adhesive layer.
<4> The optical body according to any one of <1> to <3>, wherein the second optical layer is a cured product of a photocurable resin composition.
<5> The optical body according to <4>, wherein the photocurable resin composition contains a polyfunctional (meth) acrylate monomer and a monofunctional (meth) acrylate compound.
<6> The optical body according to <5>, wherein the monofunctional (meth) acrylate compound contains acryloylmorpholine.
<7> The optical body according to any one of <1> to <6>, wherein a minimum thickness of the second optical layer is 2 μm or more and 40 μm or less.
<8> The optical body according to any one of <1> to <7>, wherein the adhesive layer is an acrylic adhesive layer.
<9> The optical body according to any one of <1> to <8>, wherein a transmitted image clarity of a 2.0 mm optical comb measured according to JIS K-7374: 2007 is 60% or more. is there.
<10> The optical body according to any one of <1> to <9>, wherein a transmitted image definition of an optical comb of 0.5 mm measured in accordance with JIS K-7374: 2007 is 60% or more. is there.

According to the present invention, it is possible to provide an optical body that functions as a glass scattering prevention film and can suppress a decrease in transmitted image clarity due to water sticking when the second optical layer and the adhesive layer are laminated in contact with each other. it can.

FIG. 1 is a cross-sectional view of an example of an optical body according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view of an example of an optical body according to the second embodiment of the present invention. FIG. 3 is a diagram for explaining the minimum value of the thickness of the second optical layer. FIG. 4 is a perspective view showing a relationship between incident light incident on an optical body having wavelength selective reflectivity and reflected light reflected by the optical body. FIG. 5A is a perspective view showing an example of the shape of the structure formed in the first optical layer. FIG. 5B is a partial cross-sectional view illustrating a configuration example of an optical body including a first optical layer in which the structure illustrated in FIG. 5A is formed. FIG. 6A is a plan view illustrating a configuration example of a first optical layer in an optical body according to an embodiment of the present invention. FIG. 6B is a cross-sectional view taken along line BB of the first optical layer shown in FIG. 6A. FIG. 7A is a process diagram for describing an example of an optical body manufacturing method according to an embodiment of the present invention (No. 1). FIG. 7B is a process diagram for describing an example of a method of manufacturing an optical body according to an embodiment of the present invention (No. 2). FIG. 7C is a process diagram for describing an example of a method of manufacturing an optical body according to an embodiment of the present invention (No. 3). FIG. 8A is a process diagram for describing an example of a method of manufacturing an optical body according to an embodiment of the present invention (No. 4). FIG. 8B is a process diagram for explaining an example of the optical body manufacturing method according to the embodiment of the present invention (No. 5). FIG. 8C is a process diagram for explaining an example of the optical body manufacturing method according to the embodiment of the present invention (No. 6). FIG. 9A is a process diagram for describing an example of an optical body manufacturing method according to an embodiment of the present invention (No. 7). FIG. 9B is a process diagram for describing an example of a method of manufacturing an optical body according to an embodiment of the present invention (No. 8). FIG. 9C is a process diagram for explaining an example of the optical body manufacturing method according to the embodiment of the present invention (No. 9). FIG. 9D is a process diagram for explaining an example of the optical body manufacturing method according to the embodiment of the present invention (No. 10). FIG. 10 is a cross-sectional view showing an example in which a conventional optical body is bonded to an adherend (external support).

In the present specification, “(meth) acrylate” means one or two selected from acrylate and methacrylate.
In this specification, “monofunctional (meth) acrylate” means “(meth) acrylate having one functional group”, and “multifunctional (meth) acrylate” means “a plurality of functional groups. It means “(meth) acrylate”.

(Optical body)
The optical body according to the first embodiment of the present invention includes at least an inorganic layer, a first optical layer, and a second optical layer, and further includes other members as necessary. In such an optical body, the second optical layer is used in contact with the adhesive layer.
The optical body according to the second embodiment of the present invention includes at least an inorganic layer, a first optical layer, a second optical layer, and an adhesive layer, and, if necessary, other members. Have

In the optical body of the present invention, the water absorption rate of the second optical layer is 15.0% by mass or less, and the tensile elongation at break of the optical body is 60% or more.

In the optical body, the present inventors omit the second substrate formed between the external support and the second optical layer, and laminate the second optical layer and the adhesive layer in contact with each other. It has been found that there is a problem that when the adhesive layer is attached to an external support by water application, the second optical layer gradually becomes cloudy and the transparency of the transparent image decreases.
Therefore, the present inventors have intensively studied to solve the above problems. As a result, it has been found that the water absorption of the second optical layer is a factor of white turbidity.
On the other hand, in the optical body stuck on a window glass, the function as what is called a glass scattering prevention film is calculated | required.
In the conventional optical body, a PET (polyethylene terephthalate) film as a substrate is interposed between the second optical layer and the adhesive layer. Therefore, it is easy to achieve the tensile elongation at break of 60% or more required as a glass scattering prevention film due to the flexibility of PET.
However, in the optical body of the present invention, the second optical layer and the adhesive layer are used in contact with each other, and the base material is omitted. Therefore, it is necessary to sufficiently examine the tensile characteristics of the second optical layer. is there.
Therefore, the present inventors function as a glass scattering prevention film by examining the composition of the second optical layer so as to satisfy the above-mentioned desired requirements regarding the water absorption and tensile properties of the second optical layer. However, the present inventors have found that an optical body capable of suppressing a decrease in transmitted image definition due to water sticking when the second optical layer and the adhesive layer are laminated in contact with each other is obtained, and the present invention has been completed.

FIG. 1 is a cross-sectional view of an example of an optical body according to the first embodiment of the present invention.
In FIG. 1, an optical body 11 includes a first optical layer 2 having an uneven surface 2a, an inorganic layer 1 disposed on the uneven surface 2a of the first optical layer 2, and other uneven portions on the inorganic layer 1 side. A second optical layer 3 having a surface 3a and disposed so that the unevenness in the other uneven surface 3a is buried, and a second optical layer 3 disposed on the surface 2b facing the uneven surface 2a of the first optical layer 2 1 substrate 4. The optical body 11 has a second base material (second base material 105 in FIG. 10) disposed on the surface 3b (external support side) facing the other uneven surface 3a of the second optical layer 3. Instead, the second optical layer 3 is used in contact with the adhesive layer.

FIG. 2 is a cross-sectional view of an example of an optical body according to the second embodiment of the present invention.
In FIG. 2, the optical body 11 includes a first optical layer 2 having an uneven surface 2 a, an inorganic layer 1 disposed on the uneven surface 2 a of the first optical layer 2, and other unevenness on the inorganic layer 1 side. A second optical layer 3 having a surface 3a and disposed so that the unevenness in the other uneven surface 3a is buried, and a second optical layer 3 disposed on the surface 2b facing the uneven surface 2a of the first optical layer 2 1 substrate 4 and an adhesive layer 5 in contact with the second optical layer 3. The optical body 11 does not have the second base material (reference numeral 105 in FIG. 10) disposed on the surface 3b (external support side) facing the other uneven surface 3a of the second optical layer 3.

<First optical layer>
The first optical layer has an uneven surface.
The first optical layer supports and protects the inorganic layer formed on the uneven surface.
The first optical layer is composed of, for example, a resin-based layer from the viewpoint of imparting flexibility to the optical body. Of the two main surfaces of the first optical layer, for example, one surface is a smooth surface and the other surface is an uneven surface (first surface). The inorganic layer is disposed on the uneven surface (first surface).

The minimum value of the thickness of the first optical layer is not particularly limited and can be appropriately selected depending on the purpose.

The first optical layer is, for example, a cured product of a photocurable resin composition.
The composition of the photocurable resin composition for forming the first optical layer may be the same as the composition of the photocurable resin composition for forming the second optical layer described later. However, different compositions are usually selected in consideration of optical characteristics and the like.

<< Storage modulus >>
The storage elastic modulus at 25 ° C. of the first optical layer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 1 × 10 ⁹ Pa or less, and 8.0 × 10 ⁸ Pa. The following is more preferable. When the storage elastic modulus is in a preferable range, the first optical layer is easily stretched, and as a result, the optical body is easily stretched.

The first optical layer preferably has a higher storage elastic modulus and is harder than the second optical layer. This is achieved by including a polyfunctional (meth) acrylate monomer in the resin constituting the first optical layer.

<Inorganic layer>
The inorganic layer is a layer disposed on the uneven surface of the first optical layer.
The inorganic layer is preferably a reflective layer that reflects at least near infrared rays. Examples of the reflective layer include the following laminated films. Details of an example of the reflective layer will be described later with reference to FIG.

The surface of the inorganic layer on the second optical layer side is preferably made of an oxide.
As the oxide is not particularly limited and may be appropriately selected depending on the purpose, for example, oxides composed mainly of ZnO, the oxide mainly composed of Nb ₂ O _5, and the like.

The average film thickness of the inorganic layer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 20 μm or less, more preferably 5 μm or less, and even more preferably 1 μm or less. When the average film thickness is 20 μm or less, an optical path through which transmitted light is refracted is shortened, and the transmitted image can be prevented from being distorted.

The method for forming the inorganic layer is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include a sputtering method, a vapor deposition method, a dip coating method, and a die coating method.

The type of the inorganic layer is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include a laminated film, a transparent conductive layer, a functional layer, and a semi-transmissive layer. These may be used alone or in combination of two or more.

<< Laminated film >>
The laminated film is not particularly limited and may be appropriately selected depending on the purpose. For example, (i) a laminated film obtained by alternately laminating low refractive index layers and high refractive index layers having different refractive indexes, (Ii) a laminated film formed by alternately laminating a metal layer having a high reflectance in the infrared region, an optical transparent layer having a high refractive index in the visible region and functioning as an antireflection layer, or a transparent conductive layer. It is done.

-Metal layer-
For the metal layer, a metal having a high reflectance in the infrared region is used.
The metal having high reflectivity in the infrared region is not particularly limited and can be appropriately selected according to the purpose. For example, Au, Ag, Cu, Al, Ni, Cr, Ti, Pd, Co, Si, Examples thereof include simple substances such as Ta, W, Mo, and Ge, and alloys containing two or more of these simple substances. Among these, Ag-based, Cu-based, Al-based, Si-based, and Ge-based materials are preferable in terms of practicality.
The alloy is not particularly limited and can be appropriately selected depending on the purpose. Etc. are preferable.
In order to suppress corrosion of the metal layer, it is preferable to add materials such as Ti and Nd to the metal layer. In particular, when Ag is used as the material of the metal layer, it is preferable to add the above material.

-Optical transparent layer-
The optical transparent layer is an optical transparent layer that has a high refractive index in the visible region and functions as an antireflection layer.
There is no restriction | limiting in particular as a material of the said optical transparent layer, According to the objective, it can select suitably, For example, high dielectric materials, such as niobium oxide, a tantalum oxide, a titanium oxide, etc. are mentioned.

For the purpose of preventing oxidation degradation of the lower layer metal during the formation of the optical transparent layer, a thin buffer layer such as Ti of about several nm may be provided at the interface of the optical transparent layer to be formed. Here, the buffer layer is a layer for suppressing oxidation of a metal layer or the like as a lower layer by oxidizing itself when forming the upper layer.

<< Transparent conductive layer >>
The transparent conductive layer is a transparent conductive layer mainly composed of a conductive material having transparency in the visible region.
There is no restriction | limiting in particular as said transparent conductive layer, According to the objective, it can select suitably, For example, a tin oxide, zinc oxide, indium tin oxide (ITO), indium zinc oxide (IZO), aluminum dope zinc oxide ( AZO), antimony-doped tin oxide, transparent conductive materials such as carbon nanotube-containing bodies, and the like.
In addition, as the transparent conductive layer, a layer in which nanoparticles of a conductive material such as nanoparticles of the transparent conductive material or metal, nanorods, and nanowires are dispersed in a resin at a high concentration may be used.

<< Functional layer >>
The functional layer is a layer mainly composed of a chromic material whose reflection performance is reversibly changed by an external stimulus.
The chromic material is a material that reversibly changes its structure by an external stimulus such as heat, light, or an intruding molecule.
There is no restriction | limiting in particular as said chromic material, According to the objective, it can select suitably, For example, a photochromic material, a thermochromic material, a gas chromic material, an electrochromic material, etc. are mentioned.

The photochromic material is a material that reversibly changes its structure by the action of light.
The photochromic material is a material that can reversibly change physical properties such as reflectance and color by irradiation with light such as ultraviolet rays.
As the photochromic material is not particularly limited and may be appropriately selected depending on the purpose, for example, Cr, Fe, _TiO 2 doped with like _{Ni, WO 3, MoO 3,} Nb 2 O 5 transition metal such as And oxides. Moreover, wavelength selectivity can also be improved by laminating | stacking the layer from which these layers and refractive indexes differ.

The thermochromic material is a material that reversibly changes its structure by the action of heat.
The thermochromic material can reversibly change various physical properties such as reflectance and color by heating.
As the thermochromic material is not particularly limited and may be appropriately selected depending on the purpose, for example, VO _2, and the like. Further, for the purpose of controlling the transition temperature and the transition curve, elements such as W, Mo, and F can be added.
Alternatively, a laminated structure in which a thin film mainly composed of a thermochromic material such as VO ₂ is sandwiched between antireflection layers mainly composed of a high refractive index body such as TiO ₂ or ITO may be employed.

Alternatively, a photonic lattice such as a cholesteric liquid crystal can be used. The cholesteric liquid crystal can selectively reflect light having a wavelength corresponding to the layer interval, and the layer interval changes depending on the temperature. Therefore, the physical properties such as reflectance and color can be reversibly changed by heating. it can. At this time, it is possible to widen the reflection band by using several cholesteric liquid crystal layers having different layer intervals.

An electrochromic material is a material that can reversibly change various physical properties such as reflectance and color by electricity.
As the electrochromic material, for example, a material that reversibly changes its structure by applying a voltage can be used. A specific example of the electrochromic material is not particularly limited and may be appropriately selected depending on the purpose. Examples thereof include a reflective light-modulating material whose reflection characteristics are changed by doping or dedoping such as proton. It is done.
Specifically, the reflection-type light control material is a material that can control its optical properties to a transparent state, a mirror state, and / or an intermediate state by an external stimulus. As the reflection type light modulating material is not particularly limited and may be appropriately selected depending on the purpose, for example, alloy materials, WO ₃ to alloy magnesium and nickel, an alloy material of magnesium and titanium as main components And a material in which needle-shaped crystals having selective reflectivity are confined in a microcapsule.

The specific configuration of the functional layer is not particularly limited and may be appropriately selected depending on the purpose. For example, (i) a catalyst layer containing the alloy layer, Pd, or the like on the second optical layer, thin buffer layer such as Al, an electrolyte layer such as Ta ₂ O _5, an ion storage layer, such as WO ₃ containing protons, the transparent conductive layer is laminated structure, (ii) a transparent conductive layer on the second optical layer, electrolyte layer, an electrochromic layer, such as WO _3, a transparent conductive layer are laminated configuration, and the like.
In these configurations, by applying a voltage between the transparent conductive layer and the counter electrode, protons contained in the electrolyte layer are doped or dedoped in the alloy layer. Thereby, the transmittance | permeability of an alloy layer changes. In order to improve wavelength selectivity, it is desirable to laminate an electrochromic material with a high refractive index material such as TiO ₂ or ITO.
Other configurations include a configuration in which a transparent conductive layer, an optical transparent layer in which microcapsules are dispersed, and a transparent electrode are laminated on the second optical layer. In this configuration, by applying a voltage between both transparent electrodes, the acicular crystal in the microcapsule is in a transmission state in which it is oriented, or by removing the voltage, the acicular crystal is directed in all directions to be in a wavelength selective reflection state. can do.

<< Semi-transmissive layer >>
The semi-transmissive layer is made of, for example, a single layer or a plurality of metal layers and has semi-transmissibility.
There is no restriction | limiting in particular as a material of the said metal layer, According to the objective, it can select suitably, For example, the thing similar to the metal layer of the above-mentioned laminated film can be used.

<Second optical layer>
The second optical layer has another uneven surface (second surface) on the inorganic layer side, and is arranged (formed) so that the unevenness on the other uneven surface (second surface) is buried. , Protect the inorganic layer.
The water absorption of the second optical layer is 15.0% by mass or less.
The second optical layer is, for example, a cured product of a photocurable resin composition.

Of the two main surfaces of the second optical layer, for example, one surface is a smooth surface and the other surface is another uneven surface (second surface). The uneven surface of the first optical layer and the other uneven surface of the second optical layer are in a relationship in which the unevenness is reversed.

<< Water absorption >>
The water absorption of the second optical layer is 15.0% by mass or less, preferably 0% by mass or more and 15.0% by mass or less, and more preferably 0% by mass or more and 10.0% by mass or less. The lower the water absorption, the more the white turbidity can be suppressed and the better the white turbidity recovery after 72 hours.
The water absorption rate of the second optical layer can be determined, for example, according to JIS K 7209: 2000 by the following method.
The second optical layer is isolated from the optical body, measured for mass (M ₀ ), and immersed in water at 25 ° C. for 24 hours. Thereafter, the water on the surface is sufficiently wiped off, and the mass (M ₂₄ ) is measured. The water absorption rate (mass%) is obtained by the following formula.
Water absorption (mass%) = (M ₂₄ −M ₀ ) / M ₀

The method for adjusting the water absorption rate in the second optical layer is not particularly limited and may be appropriately selected depending on the intended purpose. For example, the second optical layer may be selected from the photocurable resin composition. In consideration of the functional group amount, the number of functional groups, the blending amount, water solubility, water insolubility, etc. of the constituent components of the photocurable resin composition, the composition of the photocurable resin composition is The method of deciding is mentioned. For example, when the crosslinking component is reduced in the photocurable resin composition and the crosslinking density is lowered, the second optical layer having high flexibility can be obtained, and the tensile elongation at break of the optical body can be increased. The water absorption of the optical layer is increased. In that case, by using a water-insoluble monofunctional (meth) acrylate compound and a water-insoluble polyfunctional (meth) acrylate monomer, a water-soluble monofunctional (meth) acrylate compound, a water-soluble polyfunctional (meth) Compared with the case of using an acrylate monomer, the water absorption can be reduced.

In addition, the water sticking that causes the second optical layer to become cloudy is a sticking method that can be reattached and is effective in preventing the remaining of air bubbles on the adhesive surface and uneven sticking. It is a method usually used when various functional films are attached to a smooth surface (for example, glass) through an adhesive layer.
In the water application, for example, an appropriate amount of a coating liquid (for example, water) is applied to an adhesive layer or glass as an external support, and then the adhesive layer is applied to the external support. At that time, by sticking the coating liquid while extruding it with a squeegee or the like, it is possible to stick without leaving bubbles and uneven sticking, and the coating liquid is discharged from between the adhesive layer and the external support. However, it is not completely discharged, and the coating liquid slightly remains between the adhesive layer and the external support and evaporates over a long time. However, if the water absorption of the second optical layer is high, the second optical layer absorbs the remaining coating liquid and gradually becomes cloudy.
In addition, although a coating liquid is water normally, in order to improve workability | operativity, a surfactant may be contained.

<< Photocurable resin composition >>
The photocurable resin composition contains at least a photoradical generator, preferably contains a radical curable material, and further contains other components as necessary.

<<< Radically curable material >>>
Examples of the radical curable material include monofunctional (meth) acrylate compounds, polyfunctional (meth) acrylate monomers, and phosphate group-containing acrylates.

The first optical layer and the second optical layer are made of, for example, cured products of different photocurable resin compositions, but from the viewpoint of refractive index, a base resin (that is, bifunctional urethane (meth) acrylate) And monofunctional (meth) acrylate compounds) are preferably the same.

-Monofunctional (meth) acrylate compounds-
The monofunctional (meth) acrylate compound is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include an alicyclic monofunctional acrylate monomer, a monofunctional acrylate monomer having a nitrogen-containing heterocycle, and a straight chain. And monofunctional acrylate monomers having an alkylene oxide chain, and the like. These may be used individually by 1 type and may use 2 or more types together.
Among these, in terms of hardness adjustment, monofunctional acrylate monomers having a cyclic structure such as alicyclic monofunctional acrylate monomers and monofunctional acrylate monomers having nitrogen-containing heterocycles, in particular, glass transition temperature Tg of 80 ° C. or higher Monofunctional acrylate monomers having the following cyclic structure are preferred.

-Alicyclic monofunctional acrylate monomer-
The alicyclic monofunctional acrylate monomer is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include isobornyl acrylate (glass transition temperature Tg: 97 ° C.), dicyclopentenyl (meth) acrylate. (Glass transition temperature Tg: 120 ° C.), dicyclopentanyl acrylate (glass transition temperature Tg: 120 ° C.), and the like. These may be used individually by 1 type and may use 2 or more types together.

--- Monofunctional acrylate monomer having nitrogen-containing heterocycle--
The monofunctional acrylate monomer having a nitrogen-containing heterocycle is not particularly limited and may be appropriately selected depending on the intended purpose. For example, acryloylmorpholine, isopropylacrylamide, hydroxyethylacrylamide, N-acryloyloxyethylhexahydrophthalimide And pentamethylpiperidyl methacrylate. These may be used individually by 1 type and may use 2 or more types together.
Among these, acryloylmorpholine (glass transition temperature Tg: 145 ° C.) is preferable.

--Linear monofunctional acrylate monomer--
The linear monofunctional acrylate monomer is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include n-octyl acrylate (glass transition temperature Tg: −65 ° C.), stearyl acrylate (glass transition temperature). Tg: 30 ° C.) and lauryl acrylate (glass transition temperature Tg: 15 ° C.). These may be used individually by 1 type and may use 2 or more types together.

--Acrylate monomer having a hydroxyl group--
The acrylate monomer having a hydroxyl group is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include 1,4-cyclohexanedimethanol monoacrylate (glass transition temperature Tg: 18 ° C.), 4-hydroxybutyl Examples thereof include acrylate, phenyl glycidyl ether acrylate (glass transition temperature Tg: −32 ° C.), 2-hydroxypropyl acrylate (glass transition temperature Tg: −7 ° C.), and the like. These may be used individually by 1 type and may use 2 or more types together.

--Monofunctional acrylate monomer having an alkylene oxide chain--
The monofunctional acrylate monomer having an alkylene oxide chain is not particularly limited and may be appropriately selected depending on the intended purpose. For example, phenoxyethyl acrylate (glass transition temperature Tg: −22 ° C.), ethoxylated o-phenyl Examples include phenol acrylate, phenoxy polyethylene glycol acrylate, and methoxy polyethylene glycol acrylate. These may be used individually by 1 type and may use 2 or more types together.
Among these, phenoxyethyl acrylate (glass transition temperature Tg: −22 ° C.) and ethoxylated o-phenylphenol acrylate are preferable.

-Multifunctional (meth) acrylate monomer-
There is no restriction | limiting in particular as said polyfunctional (meth) acrylate monomer, Although it can select suitably according to the objective, A cyclic crosslinking agent is more preferable.
This is because by using the polyfunctional (meth) acrylate monomer, the cured product can be heat-resistant without greatly changing the storage elastic modulus at room temperature. When the storage elastic modulus at room temperature changes greatly, the optical body becomes brittle and it becomes difficult to produce the optical body by a roll-to-roll process or the like.
The cyclic crosslinking agent is not particularly limited and may be appropriately selected depending on the intended purpose. For example, dioxane glycol diacrylate, tricyclodecane dimethanol diacrylate, tricyclodecane dimethanol dimethacrylate, ethylene oxide modified isocyanuric Examples thereof include acid diacrylate, ethylene oxide-modified isocyanuric acid triacrylate (ethoxylated isocyanuric acid triacrylate), caprolactone-modified tris (acryloxyethyl) isocyanurate, and the like. These may be used individually by 1 type and may use 2 or more types together.
Among these, ethylene oxide-modified isocyanuric acid triacrylate (ethoxylated isocyanuric acid triacrylate) is preferable in terms of flexibility.

--2 Functional urethane (meth) acrylate--
The bifunctional urethane (meth) acrylate as an example of the polyfunctional (meth) acrylate monomer is not particularly limited and may be appropriately selected depending on the intended purpose. For example, EBECRYL8804, EBECRYL8807, EBECRYL8402 and KRM8296 Manufactured by Daicel Ornex Co., Ltd.), CN9001, CN978, CN962 (manufactured by Sartomer), purple light UV6640B, purple light UV3300B, UV3200B (manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), TEAI-2000, TE-2000 (more than Nippon Soda Co., Ltd.). These may be used individually by 1 type and may use 2 or more types together.
Among these, an aliphatic bifunctional acrylate (for example, EBECRYL 8807) is preferable in terms of flexibility and weather resistance.

The glass transition temperature of the bifunctional urethane (meth) acrylate is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably −30 ° C. or higher and 45 ° C. or lower. When the glass transition temperature is −30 ° C. or higher and 45 ° C. or lower, the tensile elongation at break and flexibility can be improved. In addition, the glass transition temperature said here points out the value of the homopolymer of the said (meth) acrylate.

There is no restriction | limiting in particular as content of the said polyfunctional (meth) acrylate monomer in the said photocurable resin composition, Although it can select suitably according to the objective, 30 to 75 mass% is preferable, 50 mass% or more and 75 mass% or less are preferable. Since the polyfunctional (meth) acrylate monomer has high reactivity, when the content is within a preferable range, it is easy to reduce the amount of the photo radical generator remaining in the second optical layer.

-Phosphate group-containing acrylate-
By including the phosphoric acid group-containing acrylate as an additive, the adhesion to the inorganic layer can be improved.
The phosphate group-containing acrylate is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include 2-methacryloyloxyethyl acid phosphate, 2-acryloyloxyethyl acid phosphate, di-2-methacrylate. Roxyethyl phosphate, and the like. These may be used individually by 1 type and may use 2 or more types together.

<<< Photoradical generator >>>
The photo radical generator is not particularly limited as long as it is an organic substance that generates radicals by light, and can be appropriately selected according to the purpose.
1-Hydroxy-cyclohexyl-phenyl-ketone (Irgacure 184)
2,2-dimethoxy-1,2-diphenylethane-1-one (Irgacure 651) 2-hydroxy-2-methyl-1-phenyl-propan-1-one (Darocur 1173)
2-Hydroxy-1- {4- [4- (2-hydroxy-2-methyl-propionyl) -benzyl] phenyl} -2-methyl-propan-1-one (Irgacure 127)
2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one (Irgacure 907)
Bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide (Irgacure 819)
Mixture of oxyphenylacetic acid 2- [2-oxo-2-phenylacetoxyethoxy] ethyl ester and oxyphenylacetic acid 2- (2-hydroxyethoxy) ethyl ester (Irgacure 745)
, Etc. These may be used individually by 1 type and may use 2 or more types together.
These are sometimes referred to as photopolymerization initiators, radical photopolymerization initiators, and the like.

There is no restriction | limiting in particular as content of the said photoradical generator in the said photocurable resin composition, Although it can select suitably according to the objective, More than 0.01 mass% and 5.0 mass% or less are preferable. More preferably, more than 0.1 mass% and 3.0 mass% or less.

<<< Other ingredients >>>
As said other component, a silane coupling agent etc. are mentioned, for example.

-Silane coupling agent-
The silane coupling agent is not particularly limited and may be appropriately selected depending on the intended purpose. For example, 3-acryloxypropyltrimethoxysilane, 3-isocyanatopropyltriethoxysilane, 3-methacryloxypropylmethyldimethoxy Silane, 3-methacryloxypropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, and the like. These may be used individually by 1 type and may use 2 or more types together.

<< Minimum value of thickness of second optical layer >>
The minimum value of the thickness of the second optical layer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 2 μm or more, more preferably 2 μm or more and 40 μm or less, and further 2 μm or more and 25 μm or less. More preferably, it is 2 μm or more and 10 μm or less. When the minimum value of the thickness of the second optical layer is 2 μm or more, the prism effect can be reduced and sufficient transparency can be obtained.
The minimum value of the thickness of the second optical layer is represented by, for example, “A” in FIG. 3, and “the thickness of the second optical layer when the thickness of the first optical layer is maximum”. means.

<< Storage modulus >>
The storage elastic modulus at 25 ° C. of the second optical layer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 1 × 10 ⁹ Pa or less, and 8.0 × 10 ⁸ Pa. The following is more preferable. When the storage elastic modulus is in a preferable range, the second optical layer is easily stretched, and as a result, the optical body is easily stretched.

It is preferable that at least one of the first optical layer and the second optical layer contains a resin having a storage elastic modulus at 25 ° C. of 3 × 10 ⁹ Pa or less. This is because flexibility can be imparted to the optical body at room temperature of 25 ° C., so that it becomes possible to manufacture the optical body on a roll-to-roll basis.

The storage elastic modulus can be confirmed as follows, for example. When the surface of the first optical layer is exposed, it can be confirmed by measuring the storage elastic modulus of the exposed surface using a micro hardness meter. Moreover, when the 1st base material etc. are formed in the surface of the 1st optical layer, after peeling the 1st base material etc. and exposing the surface of the 1st optical layer, the It can be confirmed by measuring the storage elastic modulus of the exposed surface using a micro hardness meter.
Moreover, a test piece corresponding to the first optical layer and the second optical layer may be produced, and the storage elastic modulus of the test piece may be measured.

<Adhesive layer>
There is no restriction | limiting in particular as a material of the said adhesion layer, According to the objective, it can select suitably, For example, although an acrylic type, rubber type, polyester type, a silicon type etc. are mentioned, the said adhesion layer is optical characteristics. From the viewpoint of weather resistance, an acrylic adhesive layer is preferred.
The acrylic adhesive layer is an adhesive layer containing an acrylic polymer.
In order to improve weather resistance, the adhesive layer may contain a UV absorber.

The average thickness of the adhesive layer is not particularly limited and may be appropriately selected depending on the intended purpose, but is preferably 5 μm or more and 30 μm or less, and more preferably 10 μm or more and 20 μm or less.

<Other members>
As said other member, a base material etc. are mentioned, for example.

<< Base material >>
The base material is disposed on a surface facing the uneven surface of the first optical layer, and usually has transparency.
It is preferable that the base material has energy ray permeability. Thereby, the photocurable resin composition interposed between the base material and the inorganic layer is irradiated with energy rays from the base material side to cure the photocurable resin composition. Because it can.
The shape of the substrate is preferably a film from the viewpoint of imparting flexibility to the optical body, but is not particularly limited to this shape.
There is no restriction | limiting in particular as a material of the said base material, According to the objective, it can select suitably, For example, a triacetyl cellulose (TAC), polyester (TPEE), a polyethylene terephthalate (PET), a polyimide (PI), polyamide (PA), aramid, polyethylene (PE), polyacrylate, polyether sulfone, polysulfone, polypropylene (PP), diacetyl cellulose, polyvinyl chloride, acrylic resin (PMMA), polycarbonate (PC), epoxy resin, urea resin, Examples thereof include urethane resin and melamine resin.
There is no restriction | limiting in particular as thickness of the said base material, Although it can select suitably according to the objective, 38 micrometers or more and 100 micrometers or less are preferable from a viewpoint of productivity.

<Tensile breaking elongation>
The tensile elongation at break of the optical body is 60% or more, preferably 60% or more and 1,000% or less, and more preferably 60% or more and 500% or less.
When the optical material has a tensile elongation at break of 60% or more, it can conform to the “glass scattering prevention film” defined in JIS-A5759.

In the conventional optical body, the second optical layer is in contact with the second base material, and the laminate composed of the first optical layer, the inorganic layer, and the second optical layer is composed of two base materials (the first base material). It was sandwiched between the base material and the second base material). Therefore, the tensile elongation at break of the optical body is such that the two substrates have a positive influence, so that the flexibility of the first optical layer and the second optical layer is not so much considered. The tensile elongation at break was 60% or more.
However, in the optical body of the present invention, since the second substrate is not present, the tensile breaking elongation 60 of the optical body is 60 unless the flexibility of the first optical layer and the second optical layer is taken into consideration. % Cannot be achieved.
In particular, if a method of lowering the crosslinking density in order to give flexibility in the second optical layer is adopted, the water absorption of the second optical layer is increased, and the above-described problem becomes obvious.
Therefore, considering only the flexibility of the second optical layer, it is not easy to make the water absorption of the second optical layer 15% by mass or less.

The tensile elongation at break of the optical body is measured, for example, by the following method.
Measurement is performed according to JIS A5759 2008. A test piece having a test length of 100 mm and a width of 25 mm is prepared, a tensile test is performed three times at a test speed of 300 mm / min, and an average value of strain at the time of breaking is measured.

<Transparent image clarity>
In the optical body, with respect to the transmitted image clarity for a wavelength band having transparency, the value when using a 2.0 mm optical comb is not particularly limited and can be appropriately selected according to the purpose. 60% or more is preferable, and 75% or more is more preferable.
Furthermore, in the optical body, with respect to the transmitted image clarity for a wavelength band having transparency, the value when using an optical comb of 0.5 mm is not particularly limited and can be appropriately selected according to the purpose. However, 60% or more is preferable and 75% or more is more preferable. When the transmitted image definition is 60% or more and less than 75%, the diffraction pattern is only worrisome only for very bright objects such as a light source, but the outside scenery can be clearly seen. If the value of transmitted image definition is 75% or more, the diffraction pattern is hardly noticed.
Here, the value of transmitted image definition was measured according to JIS K-7374: 2007 using ICM-1T manufactured by Suga Test Instruments. However, when the wavelength to be transmitted is different from the wavelength of the D65 light source, it is preferable to perform measurement after calibrating with a filter having a wavelength to be transmitted.

Moreover, it is preferable that the transmitted image definition of the optical comb of 2.0 mm measured according to JIS K-7374: 2007 satisfies the following relational expression (1). By doing so, it is possible to suppress a decrease in sharpness due to white turbidity.
_{-3.0 ≦ T (2.0) 72 -T} (2.0) 0 ≦ 3.0 ··· equation (1)
Here, T (2.0) ₀ represents the transmitted image clarity of the optical body. T (2.0) ₇₂ represents the transmitted image definition when the optical body is bonded to glass by water bonding using the adhesive layer and 72 hours have elapsed after the water bonding.

Furthermore, it is preferable that the transmitted image definition of an optical comb of 0.5 mm measured according to JIS K-7374: 2007 satisfies the following relational expression (2). By doing so, it is possible to suppress a decrease in sharpness due to white turbidity.
−3.0 ≦ T (0.5) ₇₂ −T (0.5) ₀ ≦ 3.0... Relational expression (2)
Here, T (0.5) ₀ represents the transmitted image clarity of the optical body. T (0.5) ₇₂ is the optical body, adhered to the glass by bonding water using the adhesive layer, representing the transmission image clarity when the 72 hours after bonding the water.

<Wavelength selective reflectivity>
FIG. 4 is a perspective view showing a relationship between incident light incident on the optical body 11 having wavelength selective reflectivity and reflected light reflected by the optical body 11. The optical body 11 has an incident surface S1 on which the light L is incident. The optical body 11, the angle of incidence (theta, phi) among the light L incident on the incident surface S1, selectively specular (-θ, φ + 180 °) directionally reflected in a direction other than the light L ₁ in a specific wavelength band relative to, for transmitting light L ₂ other than the specific wavelength band. The optical body 11 is transparent to light other than the specific wavelength band. As transparency, it is preferable that it has the range of the transmitted image clarity mentioned later. However, theta: the perpendicular l ₁ with respect to the incident surface S1, is an angle formed between the incident light L or the reflected light L _1. phi: a specific linearly l ₂ within the incident surface S1, is an angle formed between the projection and the component on the incident surface S1 and the incident light L or the reflected light L _1. Here, the specific straight line l ₂ in the incident surface means that when the incident angle (θ, φ) is fixed and the optical body 11 is rotated about the perpendicular l ₁ with respect to the incident surface S ₁ of the optical body 11, This is the axis that maximizes the reflection intensity in the direction. However, when there are a plurality of axes (directions) at which the reflection intensity is maximum, one of them is selected as the straight line l ₂ . Incidentally, the angle theta rotated clockwise with respect to the perpendicular line l ₁ is "+ theta", the angle theta rotated counterclockwise to "-θ". The angle φ rotated clockwise with respect to the straight line ₁₂ is defined as “+ φ”, and the angle φ rotated counterclockwise is defined as “−φ”.

The light of a specific wavelength band that selectively directionally reflects and the specific light to be transmitted differ depending on the use of the optical body 11. For example, when the optical body 11 is applied to a window material as an external support, light in a specific wavelength band that is selectively directionally reflected is near infrared light, and light in a specific wavelength band that is transmitted is visible. It is preferably light. Specifically, it is preferable that light in a specific wavelength band that is selectively directionally reflected is mainly near-infrared light having a wavelength band of 780 nm to 2100 nm. By reflecting near infrared rays, when an optical body is bonded to a window material such as a glass window, an increase in temperature in the building can be suppressed. Therefore, the cooling load can be reduced and energy saving can be achieved. Here, the directional reflection means that the reflected light intensity in a specific direction other than the regular reflection is stronger than the regular reflected light intensity and sufficiently stronger than the diffuse reflection intensity having no directivity. Here, “reflecting” means that the reflectance in a specific wavelength band, for example, near infrared region is preferably 30% or more, more preferably 50% or more, and further preferably 80% or more. Transmitting means that the transmittance in a specific wavelength band, for example, in the visible light region is preferably 30% or more, more preferably 50% or more, and further preferably 70% or more.

In the optical body 11 having wavelength selective reflectivity, the direction of reflection φo is preferably −90 ° or more and 90 ° or less. This is because, when the optical body 11 is attached to the external support, light in a specific wavelength band can be returned to the sky direction among the light incident from the sky. When there are no tall buildings in the vicinity, the optical body 11 in this range is useful. Further, the direction of directional reflection is preferably in the vicinity of (θ, −φ). The vicinity means a deviation within a range of preferably within 5 degrees, more preferably within 3 degrees, and even more preferably within 2 degrees from (θ, −φ). By setting the optical body 11 in this range, when the optical body 11 is attached to an external support, light of a specific wavelength band out of the light incident from above the buildings of the same height is efficiently placed above other buildings. This is because it can be returned. In order to realize such directional reflection, it is preferable to use a three-dimensional structure such as a spherical surface, a part of a hyperboloid, a triangular pyramid, a quadrangular pyramid, or a cone. The light incident from the (θ, φ) direction (−90 ° <φ <90 °) is based on the shape (θo, φo) direction (0 ° <θo <90 °, −90 ° <φo <90 °). ) Can be reflected. Alternatively, a columnar body extending in one direction is preferable. Light incident from the (θ, φ) direction (−90 ° <φ <90 °) is reflected in the (θo, −φ) direction (0 ° <θo <90 °) based on the tilt angle of the columnar body. Can do.

In the optical body 11 having wavelength selective reflectivity, light in a specific wavelength band is reflected in a direction near the retroreflection, that is, light incident on the incident surface S1 at an incident angle (θ, φ). Is preferably in the vicinity of (θ, φ). This is because, when the optical body 11 is attached to the external support, light in a specific wavelength band can be returned to the sky among the light incident from the sky. Here, the vicinity is preferably within 5 degrees, more preferably within 3 degrees, and further preferably within 2 degrees. This is because, when the optical body 11 is attached to the external support, the light in the specific wavelength band can be efficiently returned to the sky among the light incident from the sky. In addition, when the infrared light irradiation part and the light receiving part are adjacent to each other, such as an infrared sensor or infrared imaging, the retroreflection direction must be the same as the incident direction, but there is no need to sense from a specific direction Need not be in exactly the same direction.

<Uneven shape>
As shown in FIG. 5A, the shape of the structure 2c constituting the first optical layer 2 may be asymmetric with respect to the perpendicular l ₁ perpendicular to the incident surface S1 or the output surface S2 of the optical body 11. In this case, the main axis l _m of the structure 2c is thus inclined in an arrangement direction a of the structure 2c with respect to the perpendicular line l _1. Here, the main axis l _m of the structure 2c means a straight line passing through the midpoint of the bottom of the structure cross section and the apex of the structure. When the optical body 11 is pasted on a window material as an external support disposed substantially perpendicular to the ground, as shown in FIG. 5B, the principal axis l _m of the structure 2c is based on the perpendicular l _1. It is preferable to incline downward (on the ground side) of the window material as the external support. In general, the heat inflow through the window is mostly in the time zone around noon, and the altitude of the sun is often higher than 45 °. Therefore, by adopting the above shape, the light incident from these high angles can be efficiently used. This is because it can be reflected upward. 5A and 5B, an example in which the asymmetric shape is shown with respect to the perpendicular line l ₁ of the structure 2c of the prism shape. It is also a asymmetrical shape with respect to the perpendicular line l ₁ of the structure 2c other than prism-shaped. For example, the corner cube body may have an asymmetric shape with respect to the perpendicular l ₁ .

When the structure 2c is formed in a prism shape, the inclination angle α (FIG. 1) of the prism-shaped structure 2c is, for example, 45 °. When applied to a window member, the structure 2c preferably has a flat surface or curved surface with an inclination angle of 45 ° or more as much as possible from the viewpoint of reflecting a large amount of light incident from above and returning it to the sky. By adopting such a shape, incident light returns to the sky with almost one reflection, so even if the reflectivity of the wavelength selective reflection film is not so high, the incident light can be reflected efficiently in the upward direction and the wavelength can be selected. This is because light absorption in the reflective film can be reduced.

FIG. 6A is a plan view showing a configuration example of a first optical layer in an optical body according to an embodiment of the present invention. FIG. 6B is a cross-sectional view taken along line BB of the first optical layer shown in FIG. 6A.

On the main surface of the first optical layer 2, the structures 2c are two-dimensionally arranged. This arrangement is preferably the arrangement in the closest packed state. For example, on one main surface of the first optical layer 2, a dense array such as a delta dense array is formed by two-dimensionally arranging the structures 2c in a most densely packed state. In the delta dense array, for example, as shown in FIGS. 6A to 6B, structures 2c (for example, triangular pyramids) having a triangular bottom surface are arranged in a close-packed state.

Further, the shape of the structure 2c formed on the surface of the first optical layer 2 is not limited to one type, and a plurality of types of structures 2c are formed on the surface of the first optical layer. It may be. When a plurality of types of structures 2c are provided on the surface, a predetermined pattern composed of a plurality of types of structures 2c may be periodically repeated. Further, depending on desired characteristics, a plurality of types of structures 2c may be formed randomly (non-periodically).

<Optical body manufacturing method>
Hereinafter, an example of a method for manufacturing an optical body according to an embodiment of the present invention will be described with reference to FIGS. 7A to 7C, FIGS. 8A to 8C, and FIGS. 9A to 9D. Note that part or all of the manufacturing process described below is preferably performed by roll-to-roll in consideration of productivity. However, the mold manufacturing process is excluded.

First, as shown in FIG. 7A, the mold 21 having the same concave and convex shape as the structure 2c constituting the first optical layer 2 or the inverted shape of the mold 21 is formed by, for example, bite processing or laser processing. A mold (replica) is formed. Next, as shown in FIG. 7B, the uneven shape of the mold 21 is transferred to a film-like resin material by using, for example, a melt extrusion method or a transfer method. As a transfer method, a photo-curable resin composition is poured into a mold and cured by irradiating energy rays, a method of transferring heat and pressure to the resin to transfer the shape, or a resin film is supplied from a roll and heated. For example, a method of transferring the shape of the mold while adding (laminate transfer method) can be used. Thereby, as shown in FIG. 7C, the first optical layer 2 having the structure 2c on one main surface is formed.

Alternatively, as shown in FIG. 7C, the first optical layer 2 may be formed on the first substrate 4. In this case, for example, the film-like first substrate 4 is supplied from a roll, and after the photocurable resin composition is applied onto the first substrate 4, it is pressed against the mold to change the shape of the mold. A method is used in which the photocurable resin composition is cured by transferring and irradiating energy rays such as ultraviolet rays.

Next, as shown in FIG. 8A, a wavelength selective reflection layer (functional layer) as the inorganic layer 1 is formed on one main surface of the first optical layer 2. There is no restriction | limiting in particular as the film-forming method of the wavelength selection reflection layer as the inorganic layer 1, It can select suitably according to the objective, For example, sputtering method, vapor deposition method, CVD (Chemical Vapor Deposition) method, Dip coating Method, die coating method, wet coating method, spray coating method and the like, and it is preferable to select from these film forming methods according to the shape of the structure 2c and the like. Next, as shown in FIG. 8B, annealing treatment 31 is applied to the wavelength selective reflection layer as the inorganic layer 1 as necessary. The annealing temperature is, for example, in the range of 100 ° C. or higher and 250 ° C. or lower.

Next, as shown in FIG. 8C, the photocurable resin composition 22 is applied on the wavelength selective reflection layer as the inorganic layer 1.
Next, as shown in FIG. 9A, the photocurable resin composition 22 is spread to a predetermined thickness with a coater or the like to fill the uneven structure, thereby forming a laminate.
Next, as shown in FIG. 9B, for example, the photocurable resin composition 22 is cured by the energy rays 32 and a pressure 33 is applied to the laminate. There is no restriction | limiting in particular as said energy beam, According to the objective, it can select suitably, For example, an electron beam, an ultraviolet-ray, visible light, a gamma ray, an electron beam etc. are mentioned. Among these, ultraviolet rays are preferable from the viewpoint of production equipment. There is no restriction | limiting in particular as an integrated irradiation amount, It can select suitably considering the hardening characteristic of resin, the yellowing suppression of resin or the base material 4, etc. There is no restriction | limiting in particular as a pressure added to a laminated body, Although it can select suitably according to the objective, 0.01 MPa or more and 1 MPa or less are preferable. If the pressure applied to the laminate is less than 0.01 MPa, there is a problem in the running property of the film. On the other hand, if it exceeds 1 MPa, it is necessary to use a metal roll as the nip roll, and pressure unevenness is likely to occur.
As described above, as shown in FIG. 9C, the second optical layer 3 is formed on the wavelength selective reflection layer as the inorganic layer 1, and the optical body 11 is obtained.
Furthermore, in the optical body of the present invention, the adhesive layer 5 may be formed on the side opposite to the inorganic layer 1 side of the second optical layer 3. There is no restriction | limiting in particular as a formation method of the adhesion layer 5, According to the objective, it can select suitably, For example, you may form by apply | coating an adhesive composition on the 2nd optical layer 3, You may form by bonding the 2nd optical layer 3 and the adhesion layer 5 by a lamination process.
The flatness of the surface 3b facing the other uneven surface 3a of the second optical layer 3 is caused by the flatness of the coater head and the like, and the thickness of the resin (the unevenness of the unevenness).

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

Example 1
<Production of optical body>
Using a transfer mold having a two-dimensional parallel groove, the following optical curable resin composition A1 is used on a PET base material A4300 (manufactured by Toyobo Co., Ltd., thickness 50 μm), and the first optical layer shown in FIG. 5A Formed. On the formed 1st optical layer, the inorganic layer of the following structure was formed by the vacuum sputtering method. On the formed inorganic layer, the following photocurable resin composition B1 was apply | coated, and it irradiated and hardened | cured with the ultraviolet-ray, and formed the 2nd optical layer. Thus, an optical body was obtained. The thickness of the thinnest part of the second optical layer after curing was 20 μm. The thickness of the optical body was 85 μm.

<< Photocurable resin composition A1 >>
The materials described in Table 1 below were mixed to obtain a photocurable resin composition A1.

Details of the materials in Table 1 are as follows.
EBECRYL 8807: bifunctional urethane acrylate, manufactured by Daicel Ornex Co., Ltd. ACMO: acryloylmorpholine as a monofunctional acrylate monomer having a nitrogen-containing heterocyclic ring, manufactured by KJ Chemicals, glass transition temperature Tg: 145 ° C
A-NOD-N: 1,9-nonanediol diacrylate as a polyfunctional acrylate monomer, manufactured by Shin-Nakamura Chemical Co., Ltd., glass transition temperature Tg: 67 ° C.
NK ester A9300: ethoxylated isocyanuric acid triacrylate as a polyfunctional acrylate monomer, manufactured by Shin-Nakamura Chemical Co., Ltd. Irgacure 127: photoradical generator (photopolymerization initiator), manufactured by BASF Japan

<< Structure of inorganic layer >>
(First optical layer) / Nb ₂ O ₅ (32 nm) / AgPdCu (11 nm) / Al ₂ O ₃ —ZnO (8 nm) / Nb ₂ O ₅ (70 nm) / AgPdCu (11 nm) / AZO (32 nm) / ( Second optical layer)

<< Photocurable resin composition B1 >>
46.9 parts by mass of bifunctional urethane acrylate (EBECRYL 8807, manufactured by Daicel Ornex Co., Ltd.) and acryloylmorpholine (ACMO, manufactured by KJ Chemicals, Inc., glass transition temperature Tg: 145) as a monofunctional acrylate monomer having a nitrogen-containing heterocyclic ring And 33 parts by mass of 2,2-dimethyl-3- (acryloyloxy) propionic acid as a polyfunctional acrylate monomer (Kayarad FM-400, Nippon Kayaku Co., Ltd.) A monomer-containing composition (resin composition) containing 13 parts by mass of a product) and 0.1 part by mass of 2-methacryloxyethyl acid phosphate (light ester P-2M, manufactured by Kyoeisha Chemical Co., Ltd.) as a phosphoric acid-containing acrylate Photo radical generator (light) 0.5 parts by mass of Irgacure 127 (manufactured by BASF Japan Ltd.) as a polymerization initiator) was added.

The obtained optical body was subjected to the following tests and measurements. The results are shown in Table 2-1.

<Measurement of tensile elongation at break of optical body>
Measurement was carried out according to JIS A5759 2008. That is, a test piece (test length: 100 mm × width: 25 mm) was prepared so that a tensile test could be performed in the parallel direction of the two-dimensional parallel groove formed in the first optical layer. A tensile test was performed three times at a test speed of 300 mm / min, and an average value of strain at the time of breakage was measured.

<Water absorption rate>
The water absorption rate of the second optical layer was determined by the following method based on JIS K 7209: 2000.
The second optical layer was isolated from the optical body, measured for mass (M ₀ ), and immersed in water at 25 ° C. for 24 hours. Thereafter, the water on the surface was sufficiently wiped off, and the mass (M ₂₄ ) was measured. The water absorption rate (mass%) was determined by the following formula.
Water absorption (mass%) = (M ₂₄ −M ₀ ) / M ₀

<Measurement of transmitted image clarity>
According to JIS K-7374: 2007, the transmitted image sharpness was evaluated using an optical comb having a comb width of 0.5 mm or 2.0 mm. The measuring apparatus used for the evaluation is an image clarity measuring instrument (ICM-1T type) manufactured by Suga Test Instruments Co., Ltd. The measurement was performed by making light incident from the second optical layer side.
Specifically, it measured as follows.

_{<< T (2.0) 0, T} (0.5) 0 ( water paste ago) >>
The fabricated optical member according to the above measuring method, and the transmission image clarity the (T ₀₎ was measured.

<< T (2.0) ₇₂ , T (0.5) ₇₂ (after 72 hours have passed since the water was applied) >>
An adhesive layer (average thickness 16 μm, MF58UV0455, manufactured by Yodogawa Paper Mill) was attached to the second optical layer of the produced optical body. It was affixed on the glass of thickness 3mm by water sticking. Immediately after water application, the transmitted image definition (T ₀ ) was measured according to the above measurement method. In addition, it took 20 minutes from applying the water-applied coating liquid (water) to the adhesive layer until draining.
After pasting with water by the above method, after storing at 25 ° C. for 72 hours, the transmitted image definition (T ₇₂ ) was measured according to the measurement method.

(Examples 2 to 4)
An optical body was produced in the same manner as in Example 1 except that the photocurable resin composition B1 in Example 1 was changed to the photocurable resin composition shown in Table 2-1.
The produced optical body was evaluated in the same manner as in Example 1. The results are shown in Table 2-1.

(Comparative Examples 1 to 4)
An optical body was produced in the same manner as in Example 1 except that the photocurable resin composition B1 in Example 1 was changed to the photocurable resin composition shown in Table 2-2.
The produced optical body was evaluated in the same manner as in Example 1. The results are shown in Table 2-2.

(Reference Example 1)
<Production of optical body>
Using a transfer mold having a two-dimensional parallel groove, a first optical layer shown in FIG. 5A is formed on a PET base material A4300 (manufactured by Toyobo Co., Ltd., thickness 50 μm) using a photocurable resin composition A1. Formed. The inorganic layer described in Example 1 was formed on the formed first optical layer by vacuum sputtering. On the formed inorganic layer, the photocurable resin composition B7 is applied, and after placing a PET base material A4300 (manufactured by Toyobo Co., Ltd., thickness 50 μm), it is cured by irradiating with ultraviolet rays to form a second optical layer. Formed. Thus, an optical body was obtained.
The layer structure of the optical body is PET / first optical layer / inorganic layer / second optical layer / PET.
About the obtained optical body, evaluation similar to Example 1 was performed. The results are shown in Table 2-2.

(Reference Example 2)
<Production of optical body>
Using a transfer mold having a two-dimensional parallel groove, a first optical layer shown in FIG. 5A is formed on a PET base material A4300 (manufactured by Toyobo Co., Ltd., thickness 50 μm) using a photocurable resin composition A1. Formed. The inorganic layer described in Example 1 was formed on the formed first optical layer by vacuum sputtering. On the formed inorganic layer, the photocurable resin composition B6 is applied, and after placing the PET base material A4300 (manufactured by Toyobo Co., Ltd., thickness 50 μm), the second optical layer is cured by irradiating with ultraviolet rays. Formed. Thus, an optical body was obtained.
The layer structure of the optical body is PET / first optical layer / inorganic layer / second optical layer / PET.
About the obtained optical body, evaluation similar to Example 1 was performed. The results are shown in Table 2-2.

Details of the materials in Tables 2-1 and 2-2 are as follows.
EBECRYL 8807: bifunctional urethane acrylate, manufactured by Daicel Ornex Co., Ltd. ACMO: acryloylmorpholine as a monofunctional acrylate monomer having a nitrogen-containing heterocyclic ring, manufactured by KJ Chemicals, glass transition temperature Tg: 145 ° C
4-HBA: 4-hydroxybutyl acrylate, manufactured by Nippon Kasei Co., Ltd. Light ester P-2M: 2-methacryloxyethyl acid phosphate as phosphoric acid-containing acrylate monomer, manufactured by Kyoeisha Chemical Co., Ltd. A-600: Polyethylene Glycol # 600 diacrylate, manufactured by Shin-Nakamura Chemical Co., Ltd. A-NOD-N: 1,9-nonanediol diacrylate as a polyfunctional acrylate monomer, manufactured by Shin-Nakamura Chemical Co., Ltd., glass transition temperature Tg: 67 ° C.
KAYARAD FM-400: 2,2-dimethyl-3- (acryloyloxy) propionic acid 2,2-dimethyl-3- (acryloyloxy) propyl, manufactured by Nippon Kayaku Co., Ltd. KAYARAD HX-220: caprolactone-modified hydroxypivalin・ Neopentyl glycol diacrylate, manufactured by Nippon Kayaku Co., Ltd. ・ KAYARAD HX-620: Caprolactone-modified hydroxypivalate neopentyl glycol diacrylate, manufactured by Nippon Kayaku Co., Ltd. ・ Aronix M-211B: Bisphenol A as a polyfunctional acrylate monomer EO-modified (n≈2) diacrylate, manufactured by Toagosei Co., Ltd. ・ Irgacure 127: photoradical generator (photopolymerization initiator), manufactured by BASF Japan Ltd.

As described above, in an optical body that includes the first optical layer, the inorganic layer, and the second optical layer, and the second optical layer is used in contact with the adhesive layer, the water absorption rate of the second optical layer. In the case where the second optical layer and the adhesive layer are laminated in contact with each other while functioning as a glass scattering prevention film because the tensile elongation at break is 60% or more. It was found that the decrease in transmitted image definition due to pasting can be suppressed.

The optical body of the present invention can be applied to a wide variety of films, but can be suitably used as a heat ray recurring film to be attached to a window glass, a wall or the like.

DESCRIPTION OF SYMBOLS 1 Inorganic layer 2 1st optical layer 2a Irregular surface 2b Surface 3a Irregular surface 3 2nd optical layer 4 1st base material 5 Adhesive layer 11 Optical body 22 Photocurable resin composition 100 Optical body 101 Inorganic layer 102 1st 1 optical layer 103 2nd optical layer 104 1st base material 105 2nd base material 106 adhesion layer 107 external support body

Claims (10)

A first optical layer having an uneven surface;
An inorganic layer disposed on the uneven surface of the first optical layer;
A second optical layer having another uneven surface on the inorganic layer side and disposed so that the unevenness on the other uneven surface is buried;
Have
The second optical layer is used in contact with the adhesive layer;
The water absorption of the second optical layer is 15.0 mass% or less;
An optical body having a tensile elongation at break of 60% or more. The optical body according to claim 1, wherein a transmitted image definition of a 2.0 mm optical comb measured in accordance with JIS K-7374: 2007 satisfies the following relational expression (1).
_{-3.0 ≦ T (2.0) 72 -T} (2.0) 0 ≦ 3.0 ··· equation (1)
Here, T (2.0) ₀ represents the transmitted image clarity of the optical body. T (2.0) ₇₂ represents the transmitted image definition when the optical body is bonded to glass by water bonding using the adhesive layer and 72 hours have elapsed after the water bonding. The optical body according to any one of claims 1 and 2, wherein a transmitted image definition of an optical comb of 0.5 mm measured in accordance with JIS K-7374: 2007 satisfies the following relational expression (2).
−3.0 ≦ T (0.5) ₇₂ −T (0.5) ₀ ≦ 3.0... Relational expression (2)
Here, T (0.5) ₀ represents the transmitted image clarity of the optical body. T (0.5) ₇₂ represents the transmitted image clarity when 72 hours have passed after the optical body is bonded to the glass by water bonding using the adhesive layer. The optical body according to any one of claims 1 to 3, wherein the second optical layer is a cured product of a photocurable resin composition. The optical body according to claim 4, wherein the photocurable resin composition contains a polyfunctional (meth) acrylate monomer and a monofunctional (meth) acrylate compound. The optical body according to claim 5, wherein the monofunctional (meth) acrylate compound contains acryloylmorpholine. The optical body according to any one of claims 1 to 6, wherein a minimum value of the thickness of the second optical layer is 2 µm or more and 40 µm or less. The optical body according to any one of claims 1 to 7, wherein the adhesive layer is an acrylic adhesive layer. The optical body according to any one of claims 1 to 8, wherein a transmitted image definition of a 2.0 mm optical comb measured in accordance with JIS K-7374: 2007 is 60% or more. The optical body according to any one of claims 1 to 9, wherein a transmitted image definition of an optical comb of 0.5 mm measured in accordance with JIS K-7374: 2007 is 60% or more.

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