JP2016191886A - Lighting member, lighting member with adhesive layer using the same, and laminated glass with light control function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting member capable of suppressing decrease in a lighting function even when used for a long period of time in an environment where temperature greatly varies.SOLUTION: The lighting member has a light-transmitting part having a plurality of grooves on one surface thereof and a light-controlling part disposed in the groove, in which one of the light-transmitting part and the light-controlling part contains a high refractive index resin and the other contains a low refractive index resin having a refractive index lower than that of the high refractive index resin. The lighting member satisfies formula (I) below, where α(1/°C) represents a coefficient of linear expansion of the low refractive index resin in the temperature range from -40°C to 85°C, α(1/°C) represents a coefficient of linear expansion of the high refractive index resin in the temperature range from -40°C to 85°C, and L (μm) represents a length of the light-controlling part corresponding to the groove in a depth direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a daylighting member that can suppress a reduction in daylighting function even when used for a long period of time in an environment with a large temperature change.

  In recent years, environmental problems such as global warming have become serious, and countermeasures are being promoted worldwide. Among these, from the viewpoint of energy saving, a method of controlling the temperature in a room or in a vehicle such as a house or a car by adjusting the amount of light incident from the outside attracts attention. As such a method, for example, a method of controlling the amount of light incident from the outside by arranging a daylighting member on a window glass or the like is known (for example, Patent Document 1).

  Here, the configuration of the daylighting member will be described. FIG. 7 is a schematic perspective view showing an example of a conventional daylighting member. The daylighting member 10 ′ shown in FIG. 7 includes a light transmission portion 1 having a plurality of grooves on one surface, and a light control portion 2 disposed in the groove. Moreover, for example, a high refractive index resin and a low refractive index resin can be used as the material of the light transmission part and the light control part, respectively. When the daylighting member having such a configuration is used for a window glass, it is possible to control light transmitted through the window glass. The reason is presumed as follows. First, FIG. 8 is a schematic sectional view showing an example of a conventional window glass provided with a daylighting member. As shown in FIG. 8A, when the daylighting member 10 ′ is disposed on the surface of the glass plate 100 via the adhesive layer 4, in the summer when the solar altitude is high, the incident angle θ of the sunlight L with respect to the daylighting member 10 ′ is Therefore, most of the sunlight L is incident on the boundary surface between the light transmission unit 1 and the light control unit 2. Such sunlight L is refracted or totally reflected at the interface between the light transmission unit 1 and the light control unit 2 and taken into the room. On the other hand, as shown in FIG. 8B, in the winter when the solar altitude is low, the incident angle θ of the sunlight L with respect to the daylighting member 10 ′ becomes smaller, and the sunlight L from an angle close to perpendicular to the daylighting member 10 ′. Is incident. Therefore, compared with the case of the summer shown in FIG. 8A, the sunlight L does not enter the interface between the light transmission unit 1 and the light control unit 2, and the ratio of the sunlight L that transmits the light transmission unit 1 is larger. To increase. Thereby, it is estimated that the light which permeate | transmits a window glass can be controlled.

JP 2014-126708 A

By the way, as a method for obtaining a daylighting member having an excellent daylighting function, it is known to use materials (high refractive index resin, low refractive index resin) having different refractive indexes for the light transmission part and the light control part, respectively. Since there is a predetermined difference between the refractive indexes of the light transmission unit and the light control unit, incident light can be totally reflected at the interface between the light transmission unit and the light control unit, and the amount of light collected can be adjusted.
However, streak-like defects occur when a daylighting member using a high refractive index resin and a low refractive index resin is used for a long period of time in an environment where the temperature difference between day and night is large. Therefore, there is a problem that the daylighting function gradually decreases. In addition, when the present inventors examined the above problems, the above-described problems occur when a layer composed of a high refractive index resin and a layer composed of a low refractive index resin are laminated. There wasn't. That is, the said subject is a subject peculiar to the lighting member produced when a high refractive index resin and a low refractive index resin are used for the lighting member which has a light transmission part and a light control part.

  The present invention has been made in view of the above circumstances, and it is a main object of the present invention to provide a daylighting member that can suppress a decrease in daylighting function even when used for a long period of time in an environment with a large temperature change. To do.

The inventors of the present invention have obtained the knowledge that excellent heat shock resistance is necessary to suppress the deterioration of the daylighting function when the daylighting member is used for a long period of time in an environment with a large temperature change. . Based on such knowledge, the inventors of the present invention have made extensive studies on the above problems, and as a result, have newly found the following. In other words, the heat shock resistance when a high refractive index resin and a low refractive index resin are used for the light transmission part and the light control part is affected by the difference in linear expansion coefficient between the light transmission part and the light control part. I found it. Specifically, the inventors of the present invention have newly found that heat shock resistance is improved by reducing the difference in linear expansion coefficient between the light transmission part and the light control part.
In addition, the inventors of the present invention have the effect that the length of the light control unit affects the heat shock resistance when a high refractive index resin and a low refractive index resin are used for the light transmission unit and the light control unit. Newly found. Specifically, it has been newly found that heat shock resistance superior to the conventional one can be obtained by adjusting the difference in linear expansion coefficient between the light transmission part and the light control part according to the length of the light control part. It was. The present invention has been completed based on such findings.

That is, the present invention has a light transmission part having a plurality of grooves on one surface and a light control part disposed in the groove part, and one of the light transmission part and the light control part is highly refracted. A low refractive index resin having a refractive index lower than that of the high refractive index resin, and the linear expansion coefficient of the low refractive index resin within a range of −40 ° C. to 85 ° C. is expressed by α ¹ ( The linear expansion coefficient of the high refractive index resin in the range of −40 ° C. to 85 ° C. is α ² (1 / ° C.), and the length of the light control unit corresponding to the depth direction of the groove is Provided is a daylighting member characterized by satisfying the following formula (I) when the thickness is L (μm).

According to the present invention, the linear expansion coefficients (α ¹ , α ² ) of the low refractive index resin and the high refractive index resin used in the light transmission portion and the light control portion are set to the light control portion corresponding to the depth direction of the groove portion. By adjusting according to the length (L), it is possible to suppress peeling and cracking of the interface between the light transmission part and the light control part due to temperature changes during the day and night, and a daylighting member having excellent heat shock resistance can do. Therefore, even when it is used for a long time in an environment with a large temperature change, it is possible to provide a daylighting member capable of suppressing a decrease in daylighting function.

  In the present invention, the refractive index of the high refractive index resin is in the range of 1.58 to 1.61, and the refractive index of the low refractive index resin is in the range of 1.47 to 1.50. preferable. This is because an excellent light control function can be obtained.

In the present invention, the α ¹ (1 / ° C.) and the α ² (1 / ° C.) preferably satisfy the following formula (i). It is because it can be set as the lighting member which can obtain the more excellent heat shock resistance and can suppress the fall of a lighting function even when it is used for a long time in the environment where a temperature change is large.

  In the present invention, it is preferable that the light transmission part contains the high refractive index resin, and the light control part contains the low refractive index resin. This is because an excellent light control function can be obtained.

The present invention is a daylighting member with an adhesive layer having a daylighting member and an adhesive layer disposed on at least one surface of the daylighting member, wherein the daylighting member has a plurality of grooves on one surface. And a light control unit disposed in the groove, wherein one of the light transmission unit and the light control unit contains a high refractive index resin, and the other has a higher refractive index than the high refractive index resin. containing less low-refractive index resin, the linear expansion coefficient in the range of -40 ° C. to 85 ° C. of the low refractive index resin and ^{α 1 (1 / ℃),} -40 ℃ ~85 ℃ of the high refractive index resin When the linear expansion coefficient within the range is α ² (1 / ° C.) and the length of the light control unit corresponding to the depth direction of the groove is L (μm), the following formula (I) is satisfied. A daylighting member with an adhesive layer is provided.

According to the present invention, the linear expansion coefficients (α ¹ , α ² ) of the low refractive index resin and the high refractive index resin used in the light transmission portion and the light control portion are set to the light control portion corresponding to the depth direction of the groove portion. By adjusting according to the length (L), it is possible to suppress peeling and cracking of the interface between the light transmission part and the light control part due to temperature changes during the day and night, and with an adhesive layer having excellent heat shock resistance It can be a daylighting member. Therefore, even when it is used for a long time in an environment with a large temperature change, it is possible to provide a daylighting member with an adhesive layer that can suppress a decrease in daylighting function.

  In the present invention, the refractive index of the high refractive index resin is in the range of 1.58 to 1.61, and the refractive index of the low refractive index resin is in the range of 1.47 to 1.50. preferable. This is because an excellent daylighting function can be obtained.

  In the present invention, it is preferable that the light transmission part contains the high refractive index resin, and the light control part contains the low refractive index resin. This is because an excellent light control function can be obtained.

The present invention is a laminated glass with a light control function having a pair of glass plates and a daylighting member disposed via an adhesive layer between the pair of glass plates, and the daylighting member has a plurality of surfaces on one surface. A light transmission portion having a groove portion, and a light control portion disposed in the groove portion, wherein one of the light transmission portion and the light control portion contains a high refractive index resin, and the other is from the high refractive index resin. Also contains a low refractive index resin having a low refractive index, the linear expansion coefficient of the low refractive index resin in the range of −40 ° C. to 85 ° C. is α ¹ (1 / ° C.), and the high refractive index resin is −40 When the linear expansion coefficient in the range of ℃ to 85 ℃ is α ² (1 / ° C) and the length of the light control unit corresponding to the depth direction of the groove is L (μm), the following formula (I And a laminated glass with a light control function.

According to the present invention, the linear expansion coefficients (α ¹ , α ² ) of the low refractive index resin and the high refractive index resin used in the light transmission portion and the light control portion are set to the light control portion corresponding to the depth direction of the groove portion. By adjusting according to the length (L), it is possible to suppress peeling and cracking of the interface between the light transmission part and the light control part due to temperature changes during the day and night, and a light control function having excellent heat shock resistance It can be a laminated glass. Therefore, even when used for a long time in an environment with a large temperature change, a laminated glass with a light control function capable of suppressing a decrease in the daylighting function can be obtained.

  In the present invention, the refractive index of the high refractive index resin is in the range of 1.58 to 1.61, and the refractive index of the low refractive index resin is in the range of 1.47 to 1.50. preferable. This is because an excellent light control function can be obtained.

  In the present invention, it is preferable that the light transmission part contains the high refractive index resin, and the light control part contains the low refractive index resin. This is because an excellent light control function can be obtained.

  The present invention has an effect that it can be a daylighting member capable of suppressing a decrease in daylighting function even when used for a long period of time in an environment with a large temperature change.

It is a schematic perspective view which shows an example of the lighting member of this invention. It is a schematic perspective view which shows an example of the light transmissive part in this invention. It is a schematic perspective view which shows an example of the metal mold | die for manufacturing the light transmissive part in this invention. It is explanatory drawing for demonstrating the light control part in this invention. It is a schematic perspective view which shows an example of the lighting member with an adhesive layer of this invention. It is a schematic perspective view which shows an example of the laminated glass with a light control function of this invention. It is a schematic perspective view which shows an example of the conventional lighting member. It is explanatory drawing for demonstrating the conventional lighting member.

  Hereinafter, the daylighting member of the present invention, the daylighting member with an adhesive layer using the same, and the laminated glass with a light control function will be described.

A. Daylighting member The daylighting member of the present invention has a light transmission part having a plurality of grooves on one surface and a light control part disposed in the groove part, and one of the light transmission part and the light control part. Contains a high refractive index resin, the other contains a low refractive index resin having a lower refractive index than the high refractive index resin, and the linear expansion coefficient of the low refractive index resin in the range of −40 ° C. to 85 ° C. α ¹ (1 / ° C.), the linear expansion coefficient of the high refractive index resin in the range of −40 ° C. to 85 ° C. is α ² (1 / ° C.), and the light control corresponding to the depth direction of the groove When the length of the part is L (μm), the following formula (I) is satisfied.

The daylighting member of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view showing an example of a daylighting member of the present invention. As shown in FIG. 1, the daylighting member 10 of the present invention includes a light transmission portion 1 having a plurality of grooves on one surface, and a light control portion 2 disposed in the grooves. In the daylighting member of the present invention, one of the light transmission part and the light control part contains a high refractive index resin, and the other contains a low refractive index resin having a refractive index lower than that of the high refractive index resin. Further, in the daylighting member of the present invention, the linear expansion coefficient in the range of −40 ° C. to 85 ° C. of the low refractive index resin is α ¹ (1 / ° C.), and the range of −40 ° C. to 85 ° C. of the high refractive index resin. When the linear expansion coefficient is α ² (1 / ° C.) and the length of the light control unit corresponding to the depth direction of the groove is L (μm), the above formula (I) is satisfied. .

According to the present invention, the linear expansion coefficients (α ¹ , α ² ) of the low refractive index resin and the high refractive index resin used in the light transmission portion and the light control portion are set to the light control portion corresponding to the depth direction of the groove portion. By adjusting according to the length (L), for example, peeling and cracking of the interface between the light transmission part and the light control part due to a temperature change during the day and night when the daylighting member is used for the window can be suppressed. Therefore, even when it is used for a long time in an environment with a large temperature change, it is possible to provide a daylighting member capable of suppressing a decrease in daylighting function. The reason can be considered as follows. That is, when a high refractive index resin and a low refractive index resin are respectively used for the light transmission part and the light control part in the daylighting member, in order to improve the heat shock resistance of the daylighting member, The difference in expansion coefficient is considered to be affected. Specifically, it is considered that the heat shock resistance of the daylighting member can be improved by reducing the difference between the linear expansion coefficients of the light transmission part and the light control part. Furthermore, it is considered that the length of the light control unit corresponding to the depth direction of the groove affects the improvement of the heat shock resistance of the daylighting member. Therefore, in the present invention, by defining the difference in the linear expansion coefficient between the light transmission unit and the light control unit according to the length of the light control unit, the interface between the light transmission unit and the light control unit due to the temperature change between day and night It is thought that peeling and cracking can be suppressed, and a daylighting member having excellent heat shock resistance can be obtained.

  The linear expansion coefficients of the light transmission part and the light control part can be adjusted by the crosslink density and the resin skeleton. For example, when reducing the linear expansion coefficient, increase the crosslinking density, decrease the molecular weight of the side chain, introduce a branching difference into the side chain, or introduce a cyclic compound into the main chain or side chain. The method of doing is suitable. The linear expansion coefficient can be adjusted by the glass transition point. Specifically, when the light transmission part and the light control part are at or below the glass transition point, the glass expansion state results in a small linear expansion coefficient. Therefore, the linear expansion coefficient becomes large.

  Hereinafter, the formula (I) and the structure of the daylighting member in the present invention will be described.

1. Formula (I)
The daylighting member of the present invention has a linear expansion coefficient of α ¹ (1 / ° C.) within the range of −40 ° C. to 85 ° C. of the low refractive index resin, and within the range of −40 ° C. to 85 ° C. of the high refractive index resin. When the linear expansion coefficient is α ² (1 / ° C.) and the length of the light control unit corresponding to the depth direction of the groove is L (μm), the following formula (I) is satisfied.

Α ¹ (1 / ° C.) in the above formula (I) is a linear expansion coefficient in the range of −40 ° C. to 85 ° C. of the low refractive index resin. Moreover, the value of α ² (1 / ° C.) in the above formula (I) is a linear expansion coefficient within the range of −40 ° C. to 85 ° C. of the above-described high refractive index resin. α ¹ and α ² can be determined by the following method, for example. First, how to obtain α ¹ will be described. A low refractive index resin film is prepared by placing a low refractive index resin between glass plates using a 100 μm film as a spacer and irradiating with ultraviolet rays. Subsequently, the obtained low refractive index resin film was peeled from the glass plate, and the coefficient of linear expansion was measured under the conditions of a measurement temperature range of −60 ° C. to 100 ° C. and a temperature increase rate of 10 ° C./min (( Α ¹ (1 / ° C.) can be determined by performing Hitachi High-Tech Science Co., Ltd. TMA / SS7100). Note that the method of obtaining α ² can be the same as the method of obtaining α ¹ , and thus the description thereof is omitted here. Further, α ¹ (1 / ° C.) and α ² (1 / ° C.) in the present invention are the temperature range of −40 ° C. to 85 ° C. among the measurement results obtained in the measurement temperature range of −60 ° C. to 100 ° C. It is the value which extracted the measurement result in it.

The values of α ¹ (1 / ° C.) and α ² (1 / ° C.) in the above formula (I) are the values of L (μm), which is the length of the light control unit corresponding to the depth direction of the groove to be described later. It is adjusted accordingly, and is not particularly limited. In the present invention, α ¹ (1 / ° C.)> Α ² (1 / ° C.) is preferably satisfied.

In the above formula (I), | α ¹ −α ² | is a difference in linear expansion coefficient between the low refractive index resin and the high refractive index resin. That is, the difference in linear expansion coefficient between the light transmission part and the light control part in the present invention. | Α ¹ −α ² | is appropriately adjusted according to α ¹ , α ² and the value of L (μm) which is the length of the light control unit corresponding to the depth direction of the groove. The value is not particularly limited as long as the value can satisfy (I).

In the present invention, it is preferable that the difference in coefficient of linear expansion between the light transmission part and the light control part is small. Therefore, | α ¹ −α ² | in the above formula (I) is preferably, for example, | α ¹ −α ² | ≦ 6.0 × 10 ⁻⁵ , and among them, | α ¹ −α ² | ≦ 3. 0.0 × 10 ⁻⁵ is preferable, and | α ¹ −α ² | ≦ 2.0 × 10 ⁻⁵ is particularly preferable.

  L in the above formula (I) is the length of the light control unit corresponding to the depth direction of the groove portion of the light transmission unit. For example, the length L in FIG. The value of L in the present invention is not particularly limited as long as it can satisfy the above formula (I). Further, since the value of L is the length of the light control unit, it is smaller than the thickness of the light transmission unit and is appropriately adjusted according to the thickness of the light transmission unit. For example, the value of L is preferably in the range of 30% to less than 100% of the thickness of the light transmission part, and more preferably in the range of 40% to 97.5%, particularly 50% to 95. % Is preferable. This is because the value of L may increase relatively and the flexibility may decrease. Further, the specific value of L is preferably in the range of 10 μm to 300 μm, for example, preferably in the range of 25 μm to 250 μm, and particularly preferably in the range of 50 μm to 200 μm.

In the present invention, as represented by the above formula (I), | α ¹ −α ² | × L ≦ 7.7 × 10 ⁻³ (μm / ° C.). Among them, in the present invention, it is preferable that | α ¹ −α ² | × L ≦ 5.8 × 10 ⁻³ (μm / ° C.). When the value of | α ¹ −α ² | × L is within the above range, peeling and cracking of the interface between the light transmission part and the light control part due to temperature change during the day and night can be suppressed, and excellent heat resistance Shock can be obtained.

In the present invention, the effect of heat shock resistance can be obtained even when only the difference between the linear expansion coefficient of the high refractive index resin and the linear expansion coefficient of the low refractive index resin is specified. That is, the daylighting member of the present invention has a light transmission part having a plurality of grooves on one surface and a light control part arranged in the groove part, and one of the light transmission part and the light control part Contains a high refractive index resin, the other contains a low refractive index resin having a lower refractive index than the high refractive index resin, and the linear expansion coefficient of the low refractive index resin in the range of −40 ° C. to 85 ° C. and α ^{1 (1} / ℃), when the linear expansion coefficient in the range of -40 ° C. to 85 ° C. in the high refractive index resin was α ² (1 / ℃), the α ^{1 (1} / ℃) and the α ² (1 / ° C.) may satisfy the following formula (i). According to the present invention, by defining the difference between the linear expansion coefficient of the high refractive index resin and the linear expansion coefficient of the low refractive index resin as shown in the following formula (i), light transmission due to temperature change between day and night is achieved. It is possible to suppress peeling and cracking at the interface between the optical part and the light control part, and to obtain excellent heat shock resistance.

2. Light transmissive portion The light transmissive portion in the present invention is a member having a plurality of groove portions on one surface. Further, the light transmission part contains either one of a high refractive index resin or a low refractive index resin having a refractive index lower than that of the high refractive index resin. Normally, the light transmission part is formed on the substrate. The substrate will be described in “4. Others” described later.
Hereinafter, the material, shape, and forming method of the light transmitting portion in the present invention will be described.

(1) Material The material used for the light transmission part is either a high refractive index resin or a low refractive index resin. In the present invention, a high refractive index resin is usually used for the light transmission part. When a high refractive index resin is used for the light transmission part, an excellent daylighting function and moldability can be obtained.
Hereinafter, the high refractive index resin and the low refractive index resin in the present invention will be described.

(A) High Refractive Index Resin The high refractive index resin in the present invention is a material that can be used for the light transmission part in the present invention and is particularly limited as long as it is a material that can satisfy the above formula (I). Not.

  The high refractive index resin in the present invention preferably has a predetermined refractive index. Specifically, it has a refractive index higher than that of the low refractive index resin described later. For example, the refractive index of the high refractive index resin is preferably in the range of 1.50 to 1.80, more preferably in the range of 1.55 to 1.65, and particularly preferably in the range of 1.58 to 1.61. . When the high refractive index resin has the above-described refractive index, a difference from the refractive index of the low refractive index resin described later can be provided, and a desired light control function can be obtained. In addition, the refractive index of high refractive index resin is the value which measured the refractive index of 589 nm and 20 degreeC using the multiwavelength Abbe refractometer (made by Atago Co., Ltd.).

  The high refractive index resin in the present invention preferably has a predetermined light transmittance. Specifically, the visible light transmittance of the high refractive index resin is preferably 70% or more, more preferably 80% or more, and particularly preferably 85% or more. Since the high refractive index resin has the above-described light transmittance, when the daylighting member of the present invention is used for a window of a room, it is possible to suppress the light incident from the outside from being absorbed by the light transmitting portion. . Thereby, visibility can be improved and a lot of light can be taken into the room. Note that the visible light transmittance was measured using a infrared visible ultraviolet spectrophotometer (UV3100PC, manufactured by Shimadzu Corporation) and measured in the wavelength range of 380 nm to 780 nm according to JIS A5759-2008. It is calculated by a prescribed calculation formula.

  Specific materials used for such a high refractive index resin include, for example, thermosetting resins and ionizing radiation curable resins. Among these, ionizing radiation curable resins are preferred from the viewpoint of curability.

  Examples of thermosetting resins include epoxy resins, phenol resins, urea resins, unsaturated polyester resins, melamine resins, alkyd resins, polyimide resins, silicone resins, hydroxyl functional acrylic resins, carboxyl functional acrylic resins, and amide functional copolymers. A polymer, a urethane resin, etc. are mentioned. The crosslinking and curing mode of these thermosetting resins is not particularly limited, and is crosslinked and cured using a commonly used crosslinking agent or curing agent.

  Examples of the ionizing radiation curable resin include an ultraviolet curable resin, an electron beam curable resin, a visible light curable resin, a near-infrared curable resin, and the like. Among these, ultraviolet rays are used from the viewpoint of versatility, curability, and light transmittance. A curable resin and an electron beam curable resin are preferred.

  The ultraviolet curable resin and the electron beam curable resin can be appropriately selected from conventionally used polymerizable oligomers or prepolymers. Examples thereof include polymerizable oligomers or prepolymers, and particularly polyfunctional polymerizable oligomers or prepolymers.

  Polymerizable oligomers or prepolymers include epoxy (meth) acrylate, urethane (meth) acrylate, polyether urethane (meth) acrylate, caprolactone urethane (meth) acrylate, polyester (meth) acrylate, polyether ( Examples include (meth) acrylate oligomers and prepolymers. These may be used alone or in combination of two or more. (Meth) acrylate refers to acrylate or methacrylate.

  In addition to the above polymerizable oligomers or prepolymers, reactive oligomers such as polythiols, reactive monomers such as vinyl pyrrolidone, 2-ethylhexyl acrylate, β-hydroxy acrylate, tetrahydrofurfuryl acrylate, 2-hydroxy-3- Bifunctional or higher functional monomers such as acryloyloxypropyl methacrylate, polyethylene glycol diacrylate, tetraethylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, and pentaerythritol tetraacrylate may be used.

  In the present invention, it is preferable to use a high refractive index resin such as an o-phenylphenol EO-modified acrylate containing aromatics, paracumylphenol EO-modified acrylate, bisphenol A diacrylate, or a material having a cardo structure.

(B) Low Refractive Index Resin The low refractive index resin in the present invention is a material that can be used for the light transmitting portion in the present invention and is particularly limited as long as it is a material that can satisfy the above formula (I). Not.

  The low refractive index resin in the present invention preferably has a predetermined refractive index. Specifically, it has a refractive index lower than that of the above-described high refractive index resin. For example, the refractive index of the low refractive index resin is preferably in the range of 1.35 to 1.70, more preferably in the range of 1.45 to 1.55, and particularly preferably in the range of 1.47 to 1.50. . When the low refractive index resin has the refractive index described above, a difference from the refractive index of the high refractive index resin described above can be provided, and a desired light control function can be obtained. In addition, the refractive index of low refractive index resin is the value measured by the method similar to the refractive index of high refractive index resin mentioned above.

  The low refractive index resin in the present invention preferably has a predetermined light transmittance. The specific light transmittance can be the same as the light transmittance of the above-described high refractive index resin, and thus the description thereof is omitted here.

  Specific materials used for such a low refractive index resin include, for example, thermosetting resins and ionizing radiation curable resins. Among these, ionizing radiation curable resins are preferred from the viewpoint of curability. The thermosetting resin and ionizing radiation curable resin used for the low refractive index resin can be the same as the thermosetting resin and ionizing radiation curable resin used for the high refractive index resin described above. The description here is omitted. The low refractive index resin may contain fine particles such as silicone particles and hollow silica having a predetermined refractive index in addition to the above-described resins. The specific fine particles can be the same as the fine particles generally used for the low refractive index resin, and thus description thereof is omitted here.

  In the present invention, for example, aliphatic acrylates not containing aromatics or fluorine-containing resins can be used as the low refractive index resin. The aliphatic acrylate is suitable from the viewpoint of low refractive index. Examples of the aliphatic acrylate include alkyl acrylates and alkylene oxide acrylates, and examples thereof include monofunctional monomers such as lauryl acrylate and ethyl carbitol acrylate, and bifunctional monomers such as nonanediol diacrylate and diethylene glycol diacrylate. Examples of the fluororesin include 2,2,2-trifluoroethyl acrylate and 2,2,3,3-tetrafluoropropyl acrylate.

(C) Others The light transmission part in the present invention may contain other materials in addition to either the high refractive index resin or the low refractive index resin described above. For example, when an ionizing radiation curable resin is used as the high refractive index resin or the low refractive index resin, it is preferable that a photopolymerization initiator is included in the light transmitting portion. As a photoinitiator, it can select suitably according to the kind of ionizing radiation, For example, photoinitiators, such as a ketone type and an acetophenone type, are mentioned. In addition, as content of the said photoinitiator, about 0.1 mass part-10 mass parts are preferable with respect to 100 mass parts of ionizing radiation hardening type resins.

  Examples of other materials contained in the light transmission part include weather resistance improvers such as ultraviolet absorbers and light stabilizers, antioxidants, crosslinking agents, hard coat agents, scratch-resistant fillers, polymerization inhibitors, and antistatic agents. And additives such as an agent, a leveling agent, a thixotropic agent, a coupling agent, a plasticizer, an antifoaming agent, and a filler.

  Further, when a high refractive index resin is used for the light transmission part, the light transmission part preferably contains a release agent. When molding the light transmission part, the mold can be easily peeled from the light transmission part. Examples of the release agent include silicone materials, fluorine materials, and phosphoric ester materials. Moreover, as content of the mold release agent in a light transmissive part, although it adjusts suitably as needed, it is preferable to exist in the range of 0.01 mass part-5 mass parts, for example.

(2) Shape The light transmitting portion in the present invention has a plurality of groove portions 3 in a straight line and in parallel on one surface, for example, as shown in FIG. About the groove part in a light transmissive part, since it can be set as the shape of the light control part mentioned later, description here is abbreviate | omitted.

The thickness of the light transmission part is appropriately selected according to the height of the groove part, but is preferably in the range of, for example, 10 μm to 300 μm, and more preferably in the range of 25 μm to 250 μm. In particular, it is preferably in the range of 50 μm to 230 μm. When the thickness of the light transmission part is larger than the above range, the light incident on the light transmission part is easily absorbed. Therefore, when the daylighting member of the present invention is used for a window in a room, it may be difficult to take in light incident from the outside. On the other hand, if the thickness of the light transmission part is smaller than the above range, it may be difficult to form the groove part in a desired shape, and a desired lighting function may not be obtained. The thickness of the light transmitting portion, i.e. the thickness of the light control layer, a T ₁ in FIG.

(3) Formation method The formation method of the light transmission part in this invention will not be specifically limited if it is a method which can form a desired light transmission part, For example, the light transmission part formation material which forms a light transmission part is used. A method of crosslinking and curing in a state in which a mold having a convex portion is pressed after being placed on the substrate is mentioned. For example, as shown in FIG. 3, the mold used at this time has a plurality of convex portions 5 on the surface, and the inverted shape and size of the convex portions 5 are the shape of the groove portion in the light transmitting portion and Corresponds to the size.

  As an arrangement method of the light transmission part forming material, for example, a method of coating on a base material can be mentioned. The specific application method is not particularly limited as long as it can be applied with a uniform thickness. For example, spin coating method, die coating method, dip coating method, bar coating method, gravure printing Method, screen printing method and the like.

  The method for curing the light transmitting portion forming material can be appropriately selected according to the type of the light transmitting portion forming material, but curing by irradiation with ionizing radiation is preferable. Among these, it is preferable to use a curing method using ultraviolet rays or electron beams from the viewpoint of practicality. About hardening conditions etc., it can set suitably according to the kind of light transmissive part formation material.

3. Light Control Unit The light control unit in the present invention is a member disposed in the groove. Further, the light control unit contains either a high refractive index resin or a low refractive index resin having a lower refractive index than that of the high refractive index resin.
Hereinafter, the material, shape, and forming method of the light control unit in the present invention will be described.

(1) Material The material used for the light control unit is either a high refractive index resin or a low refractive index resin. Specifically, when a high refractive index resin is used for the light transmission part, the material of the light control part is a low refractive index resin, while when a low refractive index resin is used for the light transmission part. The material of the light control unit is a high refractive index resin. In the present invention, a low refractive index resin is usually used for the light control unit. The high refractive index resin and low refractive index resin used for the light control unit are the same as the high refractive index resin and low refractive index resin described in “2. Light transmission part (1) Material”. Therefore, the description here is omitted.

  In the present invention, it is preferable that the light control unit has a predetermined light transmittance. Specifically, since it can be the same as the content described in the above-mentioned section “3. Light transmission part”, the description is omitted here.

  The light control unit in the present invention may contain other materials in addition to either the high refractive index resin or the low refractive index resin. For example, when an ultraviolet curable resin is used as the high refractive index resin or the low refractive index resin, it is preferable to use a photopolymerization initiator in combination. As the type of the photopolymerization initiator, those conventionally used can be used. As a content rate of a photoinitiator, it is preferable that it is about 0.1 mass part-10 mass parts with respect to 100 mass parts of ultraviolet curable resin.

(2) Shape The light control unit in the present invention can control the amount of light collected by its shape. As the vertical cross-sectional shape of such a light control unit, for example, at least one of two side surfaces constituting a triangular, square, rectangular, trapezoidal, or vertical cross-sectional shape is configured by a straight line or a curve having two or more hypotenuses. The taper shape and the shape whose four sides are curved are mentioned. 4A is an explanatory diagram showing an example of the vertical cross-sectional shape of the light control unit. The vertical cross-sectional shape of the light control unit 2 shown in FIG. 4A is trapezoidal from the left, and the hypotenuse on one side. Shows an example of a tapered shape constituted by two straight lines, and a triangular shape having a curvature at a corner.

  The shape of the light control unit in plan view is not particularly limited as long as a desired daylighting function can be obtained. The refractive index of the high refractive index resin or the low refractive index resin used in the light control unit is not limited. , And can be set as appropriate according to the alignment characteristics of the light to be collected. The specific shape of the light control unit in plan view may be, for example, a linear shape or a shape such as a curve. Furthermore, the arrangement of the light control units in plan view may be arranged in parallel, arranged in parallel, or randomly arranged in the other direction. In particular, as shown in FIG. 4B, it is preferable that the light control unit 2 is linearly arranged in parallel in a plan view.

The width of the light control unit can be appropriately set according to the shape of the light control unit and the refractive index of the high refractive index resin or low refractive index resin used in the light control unit. For example, when the light control unit contains a low refractive index resin having a refractive index lower than that of the light transmission unit, the widest width of the light control unit is preferably within a range of 5 μm to 50 μm, and more preferably 7 μm to 45 μm. It is preferably within the range, and particularly preferably within the range of 10 μm to 40 μm. If the width of the light control unit is larger than the above range, visible light may be difficult to transmit as a whole lighting member. On the other hand, if the widest width of the light control unit is smaller than the above range, the light control unit may not have a desired height or may not perform a desired light control function. Note that the widest width of the light control unit refers to the widest portion in the longitudinal sectional shape of the light control unit is a length indicated by W ₁ in FIG. 4 (a). Furthermore, longitudinal sectional shape of the light control section, trapezoidal as shown in FIG. 4 (a), when a tapered shape can also be appropriately adjusted for the width W ₂ corresponding to the upper base.

  The length of the light control unit can be appropriately adjusted according to the thickness of the light transmission unit described above. The specific length of the light control unit can be the same as the length L of the light control unit described in the section “1. Formula (I)”, and thus the description thereof is omitted here.

  The pitch width of the light control unit can be appropriately set according to the shape of the light control unit and the refractive index of the high refractive index resin or the low refractive index resin used in the light control unit. For example, when the light control unit contains a low refractive index resin having a refractive index lower than that of the light transmission unit, the pitch width is preferably in the range of 15 μm to 200 μm, for example, in the range of 20 μm to 150 μm. It is preferable that it is in the range of 25 micrometers-100 micrometers especially. If the pitch width is larger than the above range, it becomes difficult for light to enter the light control unit, and the function of the light control unit may not be sufficiently obtained. On the other hand, if the pitch width is smaller than the above range, the area of the light transmitting portion on the incident surface of the daylighting member may be reduced, making it difficult for light to pass through the light transmitting portion. Note that the pitch width of the light control units refers to the distance between the centers of adjacent light control units, and is the length indicated by P in FIG.

  The length of the light control unit in the length direction of the daylighting member is appropriately set according to the size of the daylighting member of the present invention. The length of the light control unit refers to the length in the longitudinal direction in plan view.

(3) Formation Method The formation method of the light control unit in the present invention is not particularly limited as long as it is a method capable of forming a desired light control unit. For example, a resin material that constitutes the light control unit, The method of arrange | positioning and hardening in the groove part of a light transmissive part is mentioned.

  Examples of the arrangement method of the resin material constituting the light control unit include a method of applying a resin material on the surface of the light transmission part and filling the resin material in the groove part of the light transmission part. Specific examples of the application method include a wiping method, a coating method, a dry laminating method, and an extrusion laminating method. Further, when applying the resin material, an excessive amount of the resin material overflowing from the groove portion to the surface of the light transmission portion on the surface of the light transmission portion may be scraped off using a squeegee or the like.

  A method of curing the resin material constituting the light control unit can be appropriately selected according to the type of the resin material, but curing by irradiation with ionizing radiation is preferable. Among these, it is preferable to use a curing method using ultraviolet rays or electron beams from the viewpoint of practicality. About hardening conditions etc., it can set suitably according to the kind of resin material.

4). Others The daylighting member of the present invention has at least the light transmission part and the light control part described above, but may have other members as necessary. Examples of other members include a substrate, a hard coat layer, an antifouling layer, an antistatic layer, a planarizing layer, and a haze layer. Moreover, you may have the weathering layer containing a ultraviolet absorber and a light stabilizer in the light-incidence surface side of a lighting member.
Hereinafter, the base material in the present invention will be described.

  The light transmission part in this invention is normally formed on a base material. The substrate in the present invention is not particularly limited as long as it has visible light permeability and can support a daylighting member. For example, polyethylene terephthalate, polycarbonate, polyester, polyurethane, polyvinyl alcohol, polycarbonate, acrylic, cycloolefin polymer, glass, vinyl chloride, fluororesin, rubber and the like can be used. In the present invention, polyethylene terephthalate is preferred from the viewpoints of transparency, strength and flexibility.

  The thickness of the base material is appropriately adjusted according to the use of the daylighting member, but is preferably in the range of 25 μm to 300 μm, for example. When the thickness of the substrate is thinner than the above range, wrinkles may occur on the substrate, and when it is thicker than the above range, it is difficult to wind the daylighting member in the manufacturing process. There is a risk.

  When the daylighting member of the present invention has a substrate, an easy adhesion layer, a hard coat layer, an antifouling layer, an antistatic layer and a haze layer are provided on the surface opposite to the surface on which the light transmitting portion is formed. You may do it. Moreover, the haze layer can use either an external haze due to surface irregularities or an internal haze due to an internal filler. The haze value is preferably in the range of 30% to 90%. If the haze value of the haze layer is lower than the above range, the antiglare property may not be obtained. If the haze value is higher than the above range, the deflected light is scattered and the daylighting function is obtained. May decrease.

5. Application As a use of the lighting member of the present invention, a window of a house is usually mentioned. In this case, the daylighting member may be provided on the indoor side of the glass window or on the outdoor side, but it is preferably provided on the indoor side from the viewpoint of durability and maintenance. Moreover, when providing a daylighting member in an outdoor side, it is preferable to provide the layer which has a weather resistance in the outermost surface of an outdoor side.

B. Daylighting member with an adhesive layer The daylighting member with an adhesive layer of the present invention is a daylighting member with an adhesive layer having a daylighting member and an adhesive layer disposed on at least one surface of the daylighting member, A light transmission portion having a plurality of groove portions on one surface, and a light control portion disposed in the groove portion, wherein one of the light transmission portion and the light control portion contains a high refractive index resin, and the other Contains a low refractive index resin having a refractive index lower than that of the high refractive index resin, the linear expansion coefficient of the low refractive index resin in the range of −40 ° C. to 85 ° C. is α ¹ (1 / ° C.), and The linear expansion coefficient in the range of −40 ° C. to 85 ° C. of the high refractive index resin is α ² (1 / ° C.), and the length of the light control unit corresponding to the depth direction of the groove is L (μm). Then, the following formula (I) is satisfied.

  5A and 5B are schematic perspective views showing an example of a daylighting member with an adhesive layer of the present invention. As shown in FIGS. 5A and 5B, the daylighting member 11 with an adhesive layer of the present invention includes a daylighting member 10 and an adhesive layer 4 disposed on at least one surface of the daylighting member 10.

According to the present invention, the linear expansion coefficients (α ¹ , α ² ) of the low refractive index resin and the high refractive index resin used in the light transmission portion and the light control portion are set to the light control portion corresponding to the depth direction of the groove portion. By adjusting according to the length (L), it is possible to suppress peeling and cracking of the interface between the light transmission part and the light control part due to temperature changes during the day and night, and with an adhesive layer having excellent heat shock resistance It can be a daylighting member. Therefore, even when it is used for a long time in an environment with a large temperature change, it is possible to provide a daylighting member with an adhesive layer that can suppress a decrease in daylighting function. In addition, about a specific effect, since it can be made to be the same as that of the content described in the term of the said "A. Daylighting member", description here is abbreviate | omitted.

  Hereinafter, the daylighting member and the adhesive layer in the present invention will be described.

1. Daylighting member The daylighting member in the present invention has a light transmission part having a plurality of grooves on one surface and a light control part disposed in the groove part, and one of the light transmission part and the light control part is high. The refractive index resin is contained, the other contains a low refractive index resin whose refractive index is lower than that of the high refractive index resin, and the coefficient of linear expansion of the low refractive index resin within a range of −40 ° C. to 85 ° C. is α ^1. (1 / ° C.) and α ² (1 / ° C.) as the linear expansion coefficient of the high refractive index resin within the range of −40 ° C. to 85 ° C., and the light control unit corresponding to the depth direction of the groove portion. When the length is L (μm), the member satisfies the above formula (I). The daylighting member can be the same as the contents described in the section “A. Daylighting member”, and the description thereof is omitted here.

2. Adhesive Layer The adhesive layer in the present invention is a member disposed on at least one surface of the daylighting member. In the present invention, an adhesive layer may be disposed on one surface of the daylighting member, or an adhesive layer may be disposed on both surfaces of the daylighting member.

  The adhesive layer in the present invention preferably has a predetermined light transmittance. Specifically, the visible light transmittance of the adhesive layer is preferably 70% or more, more preferably 80% or more, and particularly preferably 90% or more. When the adhesive layer has the above-described light transmittance, when the daylighting member with the adhesive layer of the present invention is used for a window in a room, it is possible to suppress light incident from the outside from being absorbed by the adhesive layer. . Thereby, visibility can be improved and a lot of light can be taken into the room. In addition, about visible light transmittance | permeability, since it can measure by the method similar to the visible light transmittance described in the term of the said "A. Daylighting member 2. Light transmissive part", description here is abbreviate | omitted.

  The adhesive layer in the present invention is not particularly limited as long as the daylighting member can be bonded to a resin base material, a glass plate, or the like. Specifically, what is used as an adhesive for a general daylighting member can be used. For example, what uses adhesives, such as rubber | gum, an acryl, an olefin, polyester, and a polyurethane, as an adhesive main agent is mentioned. Examples of such an adhesive layer include a pressure-sensitive adhesive layer. Further, the adhesive layer in the present invention may contain a weathering agent such as an ultraviolet absorber or a light stabilizer as other materials.

  The thickness of the adhesive layer is preferably in the range of 5 μm to 100 μm, for example, and more preferably in the range of 10 μm to 75 μm. If the thickness of the adhesive layer is less than the above range, when foreign matter or the like is mixed, it may become a nucleus to generate bubbles, and if the thickness of the adhesive layer exceeds the above range, the thickness of the entire daylighting member with the adhesive layer This is because there is a risk of causing problems such as an increase in weight and insufficient strength.

3. Others The daylighting member with an adhesive layer of the present invention has at least the daylighting member and the adhesive layer described above, but may have other members as necessary. Examples of other members include a substrate, a hard coat layer, an antifouling layer, an antistatic layer, a planarizing layer, and a haze layer. Moreover, you may have the weathering layer containing a ultraviolet absorber and a light stabilizer in the light-incidence surface side of a lighting member. In addition, about the specific description of a base material, since it can be made to be the same as that of the content described in the term of the said "A. Daylighting member", description here is abbreviate | omitted.

  The method for producing a daylighting member with an adhesive layer of the present invention is not particularly limited as long as it can obtain a desired daylighting member with an adhesive layer using the daylighting member and the adhesive layer described above, and with a general adhesive layer. A method similar to that of the daylighting member can be used. For example, a daylighting member with an adhesive layer can be obtained by applying an adhesive layer on the surface of the daylighting member obtained by a predetermined method.

C. Laminated glass with light control function The laminated glass with light control function of the present invention is a laminated glass with light control function having a pair of glass plates and a daylighting member disposed between the pair of glass plates via an adhesive layer. The daylighting member has a light transmission part having a plurality of grooves on one surface, and a light control part disposed in the groove part, and one of the light transmission part and the light control part has a high refractive index. The resin contains a low refractive index resin whose refractive index is lower than that of the high refractive index resin, and the linear expansion coefficient of the low refractive index resin in the range of −40 ° C. to 85 ° C. is expressed by α ¹ (1 The linear expansion coefficient in the range of −40 ° C. to 85 ° C. of the high refractive index resin is α ² (1 / ° C.), and the length of the light control unit corresponding to the depth direction of the groove When L is L (μm), the following formula (I) must be satisfied It is an feature.

  FIG. 6 is a schematic perspective view showing an example of a laminated glass with a light control function of the present invention. As shown in FIG. 6, the laminated glass 12 with a light control function of the present invention includes a pair of glass plates 6 and a daylighting member 10. Further, an adhesive layer 4 may be provided between the glass plate 6 and the daylighting member 10.

According to the present invention, the linear expansion coefficients (α ¹ , α ² ) of the low refractive index resin and the high refractive index resin used in the light transmission portion and the light control portion are set to the light control portion corresponding to the depth direction of the groove portion. By adjusting according to the length (L), it is possible to suppress peeling and cracking of the interface between the light transmission part and the light control part due to temperature changes during the day and night, and a light control function having excellent heat shock resistance It can be a laminated glass. Therefore, even when used for a long time in an environment with a large temperature change, a laminated glass with a light control function capable of suppressing a decrease in the daylighting function can be obtained. In addition, about a specific effect, since it can be made to be the same as that of the content described in the term of the said "A. Daylighting member", description here is abbreviate | omitted.

  Hereinafter, the daylighting member, the adhesive layer, and the glass plate in the present invention will be described.

1. Daylighting member The daylighting member in the present invention has a light transmission part having a plurality of grooves on one surface and a light control part disposed in the groove part, and one of the light transmission part and the light control part is high. The refractive index resin is contained, the other contains a low refractive index resin whose refractive index is lower than that of the high refractive index resin, and the coefficient of linear expansion of the low refractive index resin within a range of −40 ° C. to 85 ° C. is α ^1. (1 / ° C.) and α ² (1 / ° C.) as the linear expansion coefficient of the high refractive index resin within the range of −40 ° C. to 85 ° C., and the light control unit corresponding to the depth direction of the groove portion. When the length is L (μm), the member satisfies the above formula (I). The daylighting member can be the same as the contents described in the section “A. Daylighting member”, and the description thereof is omitted here.

2. Adhesive layer In the present invention, a daylighting member is disposed between a pair of glass plates via an adhesive layer.

  The adhesive layer in the present invention preferably has a predetermined light transmittance. Specifically, the visible light transmittance of the adhesive layer is preferably 70% or more, more preferably 80% or more, and particularly preferably 85% or more. When the adhesive layer has the above-described light transmittance, when the laminated glass with a light control function of the present invention is used for a window of a room, it is possible to prevent light incident from the outside from being absorbed by the adhesive layer. it can. Thereby, visibility can be improved and a lot of light can be taken into the room. In addition, about visible light transmittance | permeability, since it can measure by the method similar to the visible light transmittance described in the term of the said "A. Daylighting member 2. Light transmissive part", description here is abbreviate | omitted.

  The adhesive layer in the present invention is not particularly limited as long as it can adhere the daylighting member to a glass plate or the like. Specifically, what is used as an adhesive for a general daylighting member can be used. For example, thermoplastic resins such as ethylene-vinyl acetate copolymer resin (EVA) and polyvinyl butyral resin (PVB), thermosetting resins, and the like can be used, and among these, EVA and PVB are preferably used. The adhesive layer in the present invention can be used by laminating one or more of the above-mentioned adhesives.

  For example, the thickness of the adhesive layer is preferably in the range of 100 μm to 2500 μm, and more preferably in the range of 300 μm to 1600 μm. When the thickness of the adhesive layer is less than the above range, when foreign matter or the like is mixed, it becomes a nucleus and bubbles are generated, or the penetration resistance performance is lowered and the security performance may be insufficient. This is because if the thickness of the adhesive layer exceeds the above range, there is a risk of increasing the thickness and weight of the daylighting member with the adhesive layer as a whole and lowering the daylighting function due to a decrease in transmittance. The thickness of the adhesive layer here is not the total thickness of the adhesive layers formed on both surfaces of the daylighting member, but the thickness of only the adhesive layer formed on either surface of the daylighting member.

3. Glass plate The glass plate in this invention is a member which clamps a lighting member. Such a glass plate is not particularly limited as long as the daylighting member can be stably held, and a glass plate used for general laminated glass can be used. Specific examples include inorganic glass, organic glass, and inorganic / organic hybrid glass.

  It is preferable that the glass plate in this invention has desired light transmittance. Specifically, the visible light transmittance of the light transmission part is preferably 70% or more, more preferably 80% or more, and particularly preferably 90% or more. This is because the transparency of the laminated glass with a light control function of the present invention can be improved and excellent visibility can be obtained. In addition, about visible light transmittance | permeability, since it can measure by the method similar to the visible light transmittance described in the term of the said "A. Daylighting member 2. Light transmissive part", description here is abbreviate | omitted.

  Although the thickness of the glass plate in this invention is suitably adjusted according to the magnitude | size, use, etc. of the laminated glass with a light control function of this invention, it is preferable that it exists in the range of 0.1 mm-15 mm, for example. Especially, it is preferable that it exists in the range of 1 mm-12 mm. When the thickness of the glass plate is within the above range, a laminated glass with a light control function having desired transparency and mechanical strength can be obtained.

  In the present invention, the pair of opposing glass plates may be the same material or thickness, or may be different. The laminated glass with a light control function of the present invention may be constituted by a daylighting member sandwiched between a pair of opposed glass plates, and may have a plurality of glass plates as necessary. Further, the glass plate may have irregularities on the surface like frosted glass, frosted glass, and template glass, and may contain wires inside like glass with mesh.

4). Others The laminated glass with a light control function of the present invention has at least the daylighting member, the adhesive layer, and the glass plate described above, but may have other members as necessary. Moreover, the laminated glass with a light control function of this invention can use a multilayer glass for the glass plate of the one side or both sides of a pair of glass plate which opposes as needed.

  The laminated glass with a light control function of the present invention preferably has a predetermined light transmittance. Specifically, the visible light transmittance of the laminated glass with a light control function is preferably 50% or more, more preferably 60% or more, particularly preferably 70% or more, and 80% or more. More preferably. When the laminated glass with a light control function has the above-described light transmittance, the transparency of the laminated glass with a light control function of the present invention is improved, and it is possible to keep a good design, and the practicality becomes extremely high. In addition, about visible light transmittance | permeability, since it can measure by the method similar to the visible light transmittance described in the term of the said "A. Daylighting member 2. Light transmissive part", description here is abbreviate | omitted.

  The method for producing a laminated glass with a light control function of the present invention is not particularly limited as long as it can obtain a desired laminated glass with a light control function using each of the above-described members, and has a general intermediate film. A method similar to that for laminated glass can be used. For example, a daylighting member obtained by a predetermined method is disposed between a pair of glass plates via an adhesive layer, and then thermocompression bonded to obtain a laminated glass with a light control function.

D. Others In the present invention, the following daylighting member design method can be provided. That is, it has a light transmission part having a plurality of grooves on one surface and a light control part disposed in the groove part, and one of the light transmission part and the light control part contains a high refractive index resin. The other is a design method for a daylighting member containing a low refractive index resin having a lower refractive index than that of the high refractive index resin, and the linear expansion coefficient of the low refractive index resin within a range of −40 ° C. to 85 ° C. Α ¹ (1 / ° C.), the linear expansion coefficient of the high refractive index resin in the range of −40 ° C. to 85 ° C. is α ² (1 / ° C.), and the light corresponding to the depth direction of the groove portion. When the length of the control unit is L (μm), it has a material selection step of selecting the material of the high refractive index resin and the low refractive index resin so as to satisfy the following formula (I) A method for designing a daylighting member can be provided.

  According to the present invention, by having a material selection step of selecting the material of the high refractive index resin and the low refractive index resin so as to satisfy the above formula (I), the light transmission part and the light control due to the temperature change at day and night It is possible to suppress the peeling and cracking of the interface of the part, and to design a daylighting member having excellent heat shock resistance. Therefore, it is possible to design a daylighting member that can suppress a decrease in daylighting function even when used for a long time in an environment with a large temperature change.

In the present invention, excellent heat shock resistance can be obtained by reducing the difference | α ¹ −α ² | between the linear expansion coefficient of the low refractive index resin and the linear expansion coefficient of the high refractive index resin. In the material selection step, examples of a method of adjusting the linear expansion coefficient in order to reduce the value of | α ¹ −α ² | include a method of adjusting by a crosslink density and a resin skeleton. Specifically, when the linear expansion coefficient is reduced, the crosslink density is increased, the molecular weight of the side chain is decreased, a branching difference is introduced into the side chain, or the main chain or the side chain is cyclic. A method of introducing a compound or the like is preferable. The linear expansion coefficient can be adjusted by the glass transition point. Specifically, when the light transmission part and the light control part are at or below the glass transition point, the glass expansion state results in a small linear expansion coefficient. Therefore, the linear expansion coefficient becomes large.

  In the present invention, an excellent daylighting function can be obtained by increasing the difference between the refractive index of the high refractive index resin and the refractive index of the low refractive index resin. In order to increase the refractive index, for example, it is effective to increase the molecular refraction in the repeating structure of the polymer and reduce the molecular volume. Specifically, the refractive index can be increased by introducing an aromatic ring, a halogen atom other than fluorine, a sulfur atom, or the like. Among these, it is preferable to use an aromatic ring rather than a halogen atom or a sulfur atom. This is because environmental pollution can be prevented and yellowing can be suppressed. On the other hand, in order to lower the refractive index, for example, it is effective to replace a hydrogen atom with a fluorine atom. Further, it is preferable that the unsaturated bond is not included as much as possible. It is preferable to use a monomer or oligomer having a small number of acryloyl functional groups.

Moreover, in this invention, the manufacturing method of the lighting member using the design method of the lighting member mentioned above can be provided. That is, it has a light transmission part having a plurality of grooves on one surface and a light control part disposed in the groove part, and one of the light transmission part and the light control part contains a high refractive index resin. And the other is a method for producing a daylighting member containing a low refractive index resin having a lower refractive index than the high refractive index resin, wherein the linear expansion coefficient of the low refractive index resin is within a range of -40 ° C to 85 ° C. Α ¹ (1 / ° C.), the linear expansion coefficient of the high refractive index resin in the range of −40 ° C. to 85 ° C. is α ² (1 / ° C.), and the light corresponding to the depth direction of the groove portion. A light transmitting portion forming step of forming a light transmitting portion using the high refractive index resin and the low refractive index resin satisfying the formula (I) when the length of the control portion is L (μm); A method of manufacturing a daylighting member comprising a light control part forming step for forming a light control part Law can be provided.

  According to the present invention, using a high refractive index resin and a low refractive index resin that satisfy the above formula (I), a light transmission part forming step for forming a light transmission part and a light control part formation for forming a light control part By having the process, peeling and cracking of the interface between the light transmission part and the light control part due to temperature changes during the day and night can be suppressed, and a daylighting member having excellent heat shock resistance can be manufactured. Therefore, even when it is used for a long time in an environment with a large temperature change, it is possible to manufacture a daylighting member that can suppress the deterioration of the daylighting function.

  About the design method and manufacturing method of the daylighting member mentioned above, since it can be made to be the same as that of the content described in the above-mentioned item of "A. Daylighting member", description here is abbreviate | omitted.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

  Hereinafter, the present invention will be described with reference to examples and comparative examples.

(High refractive index resin composition A)
The following materials were mixed to obtain a high refractive index resin composition A. It was 1.61 when the refractive index of the obtained high refractive index resin composition A was measured on the conditions of 589 nm and 20 degreeC using the Abbe refractometer.
-A-BPEF (Shin Nakamura Chemical Co., Ltd. bifunctional acrylate) ... 40 parts by weight-Light acrylate POB-A (Kyoeisha Chemical Co., Ltd. monofunctional acrylate)
・ ・ ・ 60 parts by weight ・ Iragacure 184 (Photopolymerization initiator manufactured by BASF) ・ ・ ・ 3 parts by weight ・ Phosphate ester of tetradecanol ethylene oxide (10 mol) adduct (mold release agent)
... 0.03 parts by weight

(Low refractive index resin composition A)
The following materials were mixed to obtain a low refractive index resin composition A. It was 1.47 when the refractive index of the obtained low refractive index resin composition A was measured on the conditions of 589 nm and 20 degreeC using the Abbe refractometer.
-EBECRYL230 (Daicel Ornex Co., Ltd. urethane acrylate)
30 parts by weight SR610 (bifunctional acrylate made by Sartomer) 30 parts by weight SR256 monofunctional acrylate made by Sartomer 40 parts by weight Iragacur 184 (photopolymerization initiator made by BASF) ..3 parts by weight

(Low refractive index resin composition B)
The following materials were mixed to obtain a low refractive index resin composition B. It was 1.48 when the refractive index of the obtained low refractive index resin composition B was measured on the conditions of 589 nm and 20 degreeC using the Abbe refractometer.
-EBECRYL230 (Daicel Ornex Co., Ltd. urethane acrylate)
・ ・ ・ 40 parts by weight ・ SR508 (bifunctional acrylate made by Sartomer) ・ ・ ・ 60 parts by weight ・ Iragacure 184 (photopolymerization initiator made by BASF) ・ ・ ・ 3 parts by weight

(Low refractive index resin composition C)
The following materials were mixed to obtain a low refractive index resin composition C. It was 1.47 when the refractive index of the obtained low refractive index resin composition C was measured on the conditions of 589 nm and 20 degreeC using the multiwavelength Abbe refractometer.
-EBECRYL230 (Daicel Ornex Co., Ltd. urethane acrylate)
・ ・ ・ 25 parts by weight ・ SR508 (bifunctional acrylate made by Sartomer) ・ ・ ・ ・ 75 parts by weight ・ Iragacure 184 (photopolymerization initiator made by BASF) ・ ・ ・ 3 parts by weight

(Low refractive index resin composition D)
The following materials were mixed to obtain a low refractive index resin composition D. It was 1.47 when the refractive index of the obtained low refractive index resin composition D was measured on the conditions of 589 nm and 20 degreeC using the multiwavelength Abbe refractometer.
-EBECRYL230 (Daicel Ornex Co., Ltd. urethane acrylate)
・ ・ ・ 20 parts by weight ・ SR508 (bifunctional acrylate made by Sartomer) ・ ・ ・ 80 parts by weight ・ Iragacure 184 (photopolymerization initiator made by BASF) ・ ・ ・ 3 parts by weight

(Measurement of linear expansion coefficient)
The linear expansion coefficient of the above-described high refractive index resin composition A and low refractive index resin compositions A to D was measured. First, a 100 μm film was used as a spacer, and a resin to be measured was placed between glass plates. Next, the resin was cured by irradiating with ultraviolet rays to obtain a desired resin film. This resin film was peeled from the glass plate and measured under the following conditions using a linear expansion coefficient measuring apparatus (Hitachi High-Tech Science Co., Ltd. TMA / SS7100).
Measurement temperature range: -60 ° C to 100 ° C
Temperature increase rate: 10 ° C / min
The measurement results are shown in Table 1 below.

(Production of mold rolls I to IV)
A convex portion corresponding to the shape of the light control unit was formed on the surface of the cylindrical roll subjected to copper plating by cutting using a diamond tool. Next, the cut roll was chrome plated to form a mold roll. In addition, the mold roll was made into the mold rolls I-IV according to the magnitude | size of a convex part.

[Examples 1-12, Comparative Examples 1-4]
(Production of laminated glass with light control function)
A polyethylene terephthalate (PET) base material (A4300 manufactured by Toyobo Co., Ltd., thickness: 100 μm) was prepared, and the PET base material was transported between the above-described mold roll and nip roll. In accordance with the transportation of the PET base material, the high refractive index resin composition A is supplied onto the surface of the PET base material using a supply device, and one of the PET base material and the PET base material is pressed by the pressing force between the mold roll and the nip roll. Was filled with the high refractive index resin composition A. Next, the high refractive index resin composition A is cured by irradiating ultraviolet rays (1000 mJ / cm ² ) from the PET substrate side using an ultraviolet irradiation device (light source D bulb manufactured by Heraeus Co., Ltd. Noble Light Fusion Division). I let you. Thereafter, the high refractive index resin composition A was released from the mold roll using a peeling roll to obtain a light transmission part 1 having a groove as shown in FIG. Note that L, W ₁ , W ₂ and P in FIG. 2 are as shown in Table 2 below. Further, T ₂ in FIG. 2 was appropriately adjusted by the pressing force between the mold roll and nip roll.

Next, any one of the low refractive index resin compositions A to D is applied to the side where the groove portion of the obtained light transmitting portion is formed, and the doctor is installed substantially perpendicular to the traveling direction of the groove portion of the light transmitting portion. By squeezing using a blade, the low refractive index resin compositions A to D were filled only in the groove portion of the light transmitting portion. Thereafter, ultraviolet rays (1000 mJ / cm ² ) were irradiated using an ultraviolet irradiation device (light source D bulb manufactured by Heraeus Co., Ltd. Noble Light Fusion Division) to cure the low refractive index resin compositions A to D. In this way, a light control unit was formed, and a daylighting member as shown in FIG. 1 was obtained.

  Finally, the daylighting member was placed between a pair of glass plates via an adhesive layer (ethylene vinyl acetate copolymer resin), and vacuum lamination (135 ° C., 3 h) was performed to obtain a laminated glass with a light control function. .

  The obtained laminated glasses with light control function of Examples 1 to 12 and Comparative Examples 1 to 4 were prepared in combinations as shown in Table 3 below.

[Evaluation]
For the laminated glasses with light control function of Examples 1 to 12 and Comparative Examples 1 to 4, the linear expansion coefficient of the low refractive index resin within the range of −40 ° C. to 85 ° C. is α ¹ (1 / ° C.), and the high refractive index. From the linear expansion coefficient of the resin within the range of −40 ° C. to 85 ° C., α ² (1 / ° C.), and the length of the light control unit corresponding to the depth direction of the groove portion from L (μm), the following formula (I) The value based on was calculated. The results are shown in Table 4 below.

Moreover, the heat shock test was done about the laminated glass with a light control function of Examples 1-12 and Comparative Examples 1-4. Specifically, heat shock tests were performed on laminated glasses with light control functions of Examples 1 to 12 and Comparative Examples 1 to 4 at 30 minutes at -40 ° C and 30 minutes at 85 ° C as one cycle. . The evaluation of the heat shock test is performed visually, and details are as follows. The results are shown in Table 4 below.
×: The interface between the light transmission part and the light control part peels off in less than 100 cycles. ○: The interface between the light transmission part and the light control part peels off in less than 100 to 150 cycles. No peeling of interface

As described above, excellent heat shock resistance was obtained in the case of the laminated glasses with light control functions of Examples 1 to 12 satisfying the above formula (I). This is because the linear expansion coefficient difference | α ¹ −α ² | between the light transmission part and the light control part is controlled within a predetermined range, so that the interface between the high refractive index resin and the low refractive index resin with temperature change. This is thought to be due to the fact that the stress generated in the process was suppressed. From the above, the above formula (I) using the linear expansion coefficient difference | α ¹ −α ² | between the light transmission part and the light control part and the length L (μm) of the light control part is excellent in resistance to resistance. It became clear that it was useful as a new parameter for obtaining heat shock properties.

DESCRIPTION OF SYMBOLS 1 ... Light transmission part 2 ... Light control part 3 ... Groove part 4 ... Adhesion layer 5 ... Convex part 6 ... Glass plate 10 ... Daylighting member

Claims (10)

A light transmission part having a plurality of grooves on one surface;
A light control unit disposed in the groove,
Have
One of the light transmission part and the light control part contains a high refractive index resin, the other contains a low refractive index resin having a lower refractive index than the high refractive index resin,
The linear expansion coefficient in the range of −40 ° C. to 85 ° C. of the low refractive index resin is α ¹ (1 / ° C.), and the linear expansion coefficient of the high refractive index resin in the range of −40 ° C. to 85 ° C. is α. ² (1 / ° C.), and the length of the light control unit corresponding to the depth direction of the groove is L (μm), the daylighting member satisfies the following formula (I).

  The refractive index of the high refractive index resin is in a range of 1.58 to 1.61, and the refractive index of the low refractive index resin is in a range of 1.47 to 1.50. The daylighting member according to 1. The lighting member according to claim ^1, wherein the α ¹ (1 / ° C.) and the α ² (1 / ° C.) satisfy the following formula (i).

  The said light transmission part contains the said high refractive index resin, and the said light control part contains the said low refractive index resin, The lighting member in any one of Claim 1 to 3 characterized by the above-mentioned. A daylighting member with an adhesive layer having a daylighting member and an adhesive layer disposed on at least one surface of the daylighting member,
The daylighting member has a light transmission part having a plurality of groove parts on one surface, and a light control part arranged in the groove part,
One of the light transmission part and the light control part contains a high refractive index resin, the other contains a low refractive index resin having a lower refractive index than the high refractive index resin,
The linear expansion coefficient in the range of −40 ° C. to 85 ° C. of the low refractive index resin is α ¹ (1 / ° C.), and the linear expansion coefficient of the high refractive index resin in the range of −40 ° C. to 85 ° C. is α. ² (1 / ° C.) and the length of the light control part corresponding to the depth direction of the groove part is L (μm), and satisfies the following formula (I): .

  The refractive index of the high refractive index resin is in a range of 1.58 to 1.61, and the refractive index of the low refractive index resin is in a range of 1.47 to 1.50. 5. A daylighting member with an adhesive layer according to 5.   The daylighting member with an adhesive layer according to claim 5 or 6, wherein the light transmission part contains the high refractive index resin, and the light control part contains the low refractive index resin. A laminated glass with a light control function having a pair of glass plates and a daylighting member disposed via an adhesive layer between the pair of glass plates,
The daylighting member has a light transmission part having a plurality of groove parts on one surface, and a light control part arranged in the groove part,
One of the light transmission part and the light control part contains a high refractive index resin, the other contains a low refractive index resin having a lower refractive index than the high refractive index resin,
The linear expansion coefficient in the range of −40 ° C. to 85 ° C. of the low refractive index resin is α ¹ (1 / ° C.), and the linear expansion coefficient of the high refractive index resin in the range of −40 ° C. to 85 ° C. is α. ² (1 / ° C.), and the length of the light control unit corresponding to the depth direction of the groove is L (μm), the following formula (I) is satisfied. Glass.

  The refractive index of the high refractive index resin is in a range of 1.58 to 1.61, and the refractive index of the low refractive index resin is in a range of 1.47 to 1.50. 8. Laminated glass with a light control function according to 8.   10. The laminated glass with a light control function according to claim 8, wherein the light transmission part contains the high refractive index resin, and the light control part contains the low refractive index resin.

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