JP6722987B2 - Panel with crime prevention and dimming performance - Google Patents

Description

The present invention relates to a panel having crime prevention performance and light control performance.

For example, in Japan in the Northern Hemisphere, a window member having a dimming performance that suppresses the entrance of summer sunlight into the room and allows the entrance of winter sunlight into the room without being suppressed has been developed. ing. For example, Patent Document 1 describes a light control member in which a pair of shape-imparting resin sheets each having a convex portion formed on one surface thereof are arranged so that the convex portions face each other with an air layer interposed therebetween. There is.

JP, 2011-94471, A

In recent years, while further improvement in light control performance has been demanded for window members, the number of violent robbers and thieves who break window glass etc. and invade houses is increasing, and windows with high crime prevention performance Development of materials for use is required.

Therefore, an object of the present invention is to provide a panel having excellent light control performance and high crime prevention performance as a window member.

As a result of intensive studies to solve the above-mentioned problems, the present inventors have found a solution means having the following constitution and completed the present invention. However, the present invention is not limited to the following.

[1]
A light control member including at least one shaping resin sheet having a convex portion on one surface;
An adhesive layer arranged on one surface of the shaped resin sheet,
A transparent plate member arranged on one surface of the shaped resin sheet through the adhesive layer, a panel,
A panel in which the absolute value of the difference between the refractive index A and the refractive index B is 0.2 or less, where A is the refractive index of the shaped resin sheet and B is the refractive index of the adhesive layer.
[2]
The panel according to the above [1], wherein the shaped resin sheet contains 10% by weight or more and 45% by weight or less of rubber particles based on the total weight of the resin contained in the shaped resin sheet.
[3]
The panel according to the above [1] or [2], wherein the shape-imparting resin sheet has a thickness of 150 μm or more.
[4]
The panel according to any one of [1] to [3] above, which has the adhesive layer on a surface of the shaped resin sheet that does not have a convex portion.
[5]
The above-mentioned [1]-[having a plurality of convex portions, the height of the convex portions is 1 μm or more and 1 cm or less, and the pitch interval between adjacent convex portions of the plurality of convex portions is 10 μm or more and 10 cm or less. 4] The panel according to any one of [4].
[6]
The panel according to any one of the above [1] to [5], wherein the convex portion has a substantially triangular cross-sectional shape.
[7]
The panel according to the above [6], wherein one base angle of the substantially triangular shape is more than 0° and less than 90°, and the other base angle is 90°.
[8]
Including two shaping resin sheets having the convex portions, the convex portions of the shaping resin sheet are arranged so as to face each other, and an air layer exists between the shaping resin sheets. The panel according to any one of 1] to [7].
[9]
Including two shaped resin sheets having the convex portions, the convex portions of the shaped resin sheet are arranged so as to face each other, and an adhesive layer is present between the shaped resin sheets, The panel according to any one of [1] to [8].
[10]
The panel according to the above [8] or [9], wherein the convex portions of the two shaped resin sheets are in a point-symmetrical relationship with each other.
[11]
The panel according to any one of [1] to [7] above, which includes only one sheet of the shaped resin sheet.

According to the present invention, it is possible to provide a panel having excellent dimming performance and high crime prevention performance.

It is a schematic diagram which shows the panel of one Embodiment of this invention. It is a schematic diagram of a light control member used in one embodiment of the present invention. It is a schematic diagram of the light control member used in other embodiment of this invention. It is a schematic diagram of the manufacturing apparatus used for the manufacturing method of the shaping|molding resin sheet used by this invention. It is a schematic diagram for demonstrating a critical angle and total reflection.

The panel of the present invention has excellent dimming performance and high crime prevention performance (hereinafter, "dimming article", "dimming product", "dimming device", "dimming device", " (Light control panel) or "security product," "security product," "security device," "security device," "security panel," etc.

In the present invention, the “dimming performance” means, for example, suppressing the incidence of sunlight from the outside to the inside of the room, or allowing the sunlight to enter the inside from the outside without suppressing, through the panel, It means the ability to control the amount of light.

In the present invention, the term “security performance” means that the window member (panel) such as a window glass having excellent impact resistance is gently cracked and opened by using a sharp object such as a screwdriver to open the window member. (Hereinafter sometimes referred to as "breaking") or by opening a window member (panel) such as a window glass by using a hard material such as a bar (hereinafter also referred to as "breaking") , A function that can significantly prevent criminal acts (intrusion acts) such as robbers and thieves intruding indoors.
In addition, a robber or thief tends to give up on entering the room if it takes 1 minute or more in the case of the above "breaching" and 5 minutes or more in the case of "breaking down". In the present invention, when it takes more than 1 minute to "break" the panel and more than 5 minutes to "break" the panel, it is judged that such a panel has excellent crime prevention performance (CP (Crime Prevention) certification). According to the test and evaluation of). In addition, such "security performance" is completely different in required function and its level from "scattering prevention performance" for the purpose of preventing scattering due to destruction of window members such as window glass. It should be noted.

The panel of the present invention includes at least a light control member 10 including at least one shaped resin sheet having a convex portion on one surface, as shown in FIGS. 1 and 2, and further, The pressure-sensitive adhesive layer 20 arranged on one surface (preferably a surface not having a convex portion) of the shape-imparting resin sheet, and arranged on one surface of the shape-imparting resin sheet via the pressure-sensitive adhesive layer 20. When the refractive index of the shaped resin sheet is A and the refractive index of the adhesive layer is B, the absolute value of the difference between the refractive index A and the refractive index B ( Hereinafter, it may be referred to as “absolute value of refractive index difference”) is 0.2 or less.
In the present invention, the absolute value of the refractive index difference may be the absolute value of refractive index A-refractive index B or the absolute value of refractive index B-refractive index A.

The dimming member included in the panel of the present invention is, for example, in Japan, an acceptable dimmer that suppresses the entrance of summer sunlight into the room and/or does not suppress the entrance of winter sunlight into the room. It has optical performance.

Further, the panel of the present invention is excellent in that the absolute value of the refractive index difference is 0.2 or less, preferably 0.15 or less, more preferably 0.1 or less, and still more preferably 0.03 or less. It is possible to provide dimming performance. If this absolute value of the refractive index difference is too large, the light traveling from the adhesive layer side to the light control member is reflected or refracted at the interface between the light control member and the adhesive layer. As a result, it becomes impossible to sufficiently suppress the entrance of summer sunlight into the room, while suppressing the entrance of winter sunlight into the room. In order to bring the absolute value of the difference in refractive index into the above-mentioned predetermined range, the refractive index of each of the shaped resin sheet and the pressure-sensitive adhesive layer described later may be appropriately adjusted as necessary. In the present invention, such a refractive index difference absolute value may be zero (0).

The refractive index of the shaped resin sheet is not particularly limited as long as the absolute value of the refractive index difference is within the above-mentioned predetermined range, but is preferably 1.30 to 1.70. The refractive index of the shaped resin sheet can be measured, for example, by an Abbe refractometer according to JIS K7142.

The refractive index of the pressure-sensitive adhesive layer is not particularly limited as long as the absolute value of the refractive index difference is within the above predetermined range, but is preferably 1.20 to 1.90. The refractive index of the adhesive layer can be measured with, for example, a prism coupler 2010/M manufactured by METRICON.

Regarding the adjustment of the refractive index of the shape-imparting resin sheet and the pressure-sensitive adhesive layer, for example, it is possible to make the refractive index low by adding silica particles or fluororesin which are low refractive index components, and for example, high refractive index. It is also possible to increase the refractive index by adding metal fine particles or minerals, which are components.

Thus, the panel of the present invention has a basic dimming performance obtained by the structure of the shape-imparting resin sheet described in detail below, and further, as described above, the shape-imparting resin sheet and the adhesive. By adjusting the refractive index of the layer, further improved dimming performance can be obtained.

Further, in the panel of the present invention, by using such a shaped resin sheet together with the transparent plate member described in detail below, the panel of the present invention has excellent crime prevention performance as a window member. Will have.

Hereinafter, each member will be described in more detail.

<Shaping resin sheet>
The shaped resin sheet (or shaped resin sheet) included in the light control member that can be used in the panel of the present invention is a resin sheet having a convex portion on one surface, and for example, resin is melt extrusion molded. It is obtained by cutting, press molding, injection molding or cast polymerization. The shaped resin sheet preferably has a plurality of convex portions formed continuously on one surface. The surface not having such a convex portion (that is, the surface opposite to the surface having a convex portion) is usually a flat surface, but as long as the effect of the present invention is not impaired, a surface having irregularities (mat Surface). FIG. 2 shows a schematic view of a cross-sectional shape of a shaped resin sheet that can be used in one embodiment of the present invention.

As the above resin, a resin that can be melt-extruded is preferable, and usually, a thermoplastic resin that is brought into a molten state by being heated can be given. Examples of the thermoplastic resin include styrene resin, acrylic resin, polyethylene resin, polypropylene resin, cyclic olefin polymer resin, acrylonitrile-butadiene-styrene (ABS) resin, polyethylene terephthalate (PET) resin, polycarbonate (PC) resin. Among them, acrylic resins are preferable because they have excellent transparency and weather resistance. In the present invention, the resin contained in the shaped resin sheet is not particularly limited.

The acrylic resin is not particularly limited, and examples thereof include a homopolymer or a copolymer of two or more acrylic monomers such as (meth)acrylic acid, (meth)acrylic acid ester, (meth)acrylonitrile, and the like. Examples thereof include a copolymer of a system monomer and another monomer. In addition, in this specification, the term "(meth)acrylic" means "acrylic" or "methacrylic".

As the acrylic resin, it is preferable to use a methacrylic resin because it has excellent hardness, weather resistance, transparency, and the like. The methacrylic resin is a polymer obtained by polymerizing a monomer mainly composed of a methacrylic acid ester, for example, a homopolymer of a methacrylic acid ester (such as polyalkylmethacrylate), and 50% by weight or more of a methacrylic acid ester. Copolymers with monomers other than methacrylic acid ester of 50% by weight or less and the like can be mentioned. When the methacrylic resin is a copolymer, the blending amount thereof is preferably 70% by weight or more of methacrylic acid ester and 30% by weight or less of other monomers, more preferably methacrylic acid, based on the total amount of monomers. 90% by weight or more of acid ester and 10% by weight or less of other monomers.

Examples of the methacrylic acid ester include methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, hexyl methacrylate, heptyl methacrylate, 2-ethylhexyl methacrylate, Substitution of n-octyl methacrylate, n-nonyl methacrylate, isononyl methacrylate, decyl methacrylate, undecyl methacrylate, n-amyl methacrylate, isoamyl methacrylate, lauryl methacrylate, methoxyethyl methacrylate, ethoxyethyl methacrylate, etc. Examples thereof include alkyl methacrylate which may have a group. Among these, a methacrylic acid ester having an alkyl group having 1 to 8 carbon atoms is preferable, and methyl methacrylate is more preferable. This methacrylic acid ester may be used alone (homopolymer) or in combination of two or more kinds (copolymer).

Examples of monomers other than methacrylic acid ester include acrylic acid ester, unsaturated nitrile, ethylenically unsaturated carboxylic acid hydroxyalkyl ester, ethylenically unsaturated carboxylic acid amide, ethylenically unsaturated acid, ethylenically unsaturated sulfone. Examples thereof include acid esters, ethylenically unsaturated alcohols and esters thereof, ethylenically unsaturated ethers, ethylenically unsaturated amines, ethylenically unsaturated silane compounds, and aliphatic conjugated dienes. Among these, acrylic acid ester is preferable. The monomers other than the methacrylic acid ester may be used alone or in combination of two or more kinds.

Examples of the acrylate ester include methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, hexyl acrylate, heptyl acrylate, 2-ethylhexyl acrylate, and the like. Substitution of n-octyl acrylate, n-nonyl acrylate, isononyl acrylate, decyl acrylate, undecyl acrylate, n-amyl acrylate, isoamyl acrylate, lauryl acrylate, methoxyethyl acrylate, ethoxyethyl acrylate, etc. The alkyl acrylate which may have a group is mentioned. Among these, acrylic acid esters having an alkyl group having 1 to 8 carbon atoms are preferable, and methyl acrylate is more preferable.

Examples of unsaturated nitriles include acrylonitrile, α-chloroacrylonitrile, α-methoxyacrylonitrile, methacrylonitrile, and vinylidene cyanide.

Examples of the ethylenically unsaturated carboxylic acid hydroxyalkyl ester include hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, hydroxybutyl acrylate, and hydroxybutyl methacrylate.

Examples of the ethylenically unsaturated carboxylic acid amide include acrylamide, methacrylamide, N-butoxymethyl acrylamide, N-butoxymethyl methacrylamide, N-butoxyethyl acrylamide, N-butoxyethyl methacrylamide, N-methoxymethyl acrylamide, N-butoxymethyl acrylamide. -Methoxymethyl methacrylamide, Nn-propoxymethyl acrylamide, Nn-propoxymethyl methacrylamide, N-methyl acrylamide, N-methyl methacrylamide, N,N-dimethyl acrylamide, N,N-dimethyl methacrylamide , N,N-diethyl acrylamide, N,N-diethyl methacrylamide and the like.

Examples of the ethylenically unsaturated acid include, for example, ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid, fumaric acid, fumaric acid anhydride, maleic acid, maleic anhydride, vinylsulfonic acid and isoprenesulfonic acid, or Examples thereof include ethylenically unsaturated sulfonic acid. The ethylenically unsaturated acid monomer may be neutralized with an alkali metal such as sodium or potassium, or ammonia.

Examples of the ethylenically unsaturated sulfonic acid ester include alkyl vinyl sulfonate and alkyl isoprene sulfonate.

Examples of the ethylenically unsaturated alcohol and its ester include allyl alcohol, methallyl alcohol, vinyl acetate, vinyl propionate, vinyl butyrate, vinyl stearate, vinyl benzoate, allyl acetate, methallyl caproate, allyl laurate, and benzoate. Examples thereof include allyl acid, vinyl alkyl sulfonate, allyl alkyl sulfonate, and vinyl aryl sulfonate.

Examples of the ethylenically unsaturated ether include methyl vinyl ether, ethyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether, methyl allyl ether, ethyl allyl ether and the like.

Examples of the ethylenically unsaturated amine include vinyldimethylamine, vinyldiethylamine, vinyldiphenylamine, allyldimethylamine, methallyldiethylamine and the like.

Examples of the ethylenically unsaturated silane compound include vinyltriethylsilane, methylvinyldichlorosilane, dimethylallylchlorosilane, vinyltrichlorosilane and the like.

Examples of the aliphatic conjugated diene include 1,3-butadiene, 2-methyl-1,3-butadiene, 2,3-dimethyl-1,3-butadiene, 2-neopentyl-1,3-butadiene, 2-chloro. -1,3-butadiene, 1,2-dichloro-1,3-butadiene, 2,3-dichloro-1,3-butadiene, 2-bromo-1,3-butadiene, 2-cyano-1,3-butadiene , Substituted linear conjugated pentadienes, linear and side chain conjugated hexadienes, and the like.

Among these acrylic resins, a homopolymer of methyl methacrylate (polymethylmethacrylate), or 50 wt% to 99.9 wt% of methyl methacrylate and 0.1 wt% to 50 wt% of the above-mentioned Copolymers with (meth)acrylic acid esters other than methyl methacrylate are particularly preferred.

A copolymer of 50% by weight or more and 99.9% by weight or less of methyl methacrylate and 0.1% by weight or more and 50% by weight or less of a (meth)acrylic acid ester other than methyl methacrylate is methyl methacrylate and Methyl methacrylate is contained in a proportion of 50% by weight or more and 99.9% by weight or less, and 0.1% by weight of (meth)acrylic acid ester other than methyl methacrylate based on the total amount of the (meth)acrylic acid ester. % And 50% by weight or less is a copolymer obtained by polymerizing a monomer mixture. In this monomer mixture, methyl methacrylate is contained in a proportion of preferably 70% by weight or more and 99.9% by weight or less, more preferably 90% by weight or more and 99.9% by weight or less.

The acrylic resin is obtained by polymerizing the above-mentioned monomer by a polymerization method such as an emulsion polymerization method, a suspension polymerization method, a bulk polymerization method, a liquid injection polymerization method (cast polymerization method). The polymerization is carried out by using, for example, light irradiation or a polymerization initiator, and an azo-based initiator (for example, 2,2′-azobisisobutyronitrile, 2,2′-azobis(2,4-dimethylvaleronitrile) is used. ))), peroxide-based initiators (lauroyl peroxide, benzoyl peroxide, etc.), and redox-based initiators obtained by combining an organic peroxide and amines. The polymerization initiator is usually used in an amount of 0.01 part by weight or more and 1 part by weight or less, preferably 0.01 part by weight or more and 0.5 part by weight or less, relative to 100 parts by weight of the monomer constituting the acrylic resin. To be Further, a chain transfer agent (a linear or branched alkyl mercaptan compound such as methyl mercaptan, n-butyl mercaptan, or t-butyl mercaptan) for controlling the molecular weight, a cross-linking agent and the like may be added.

The shaped resin sheet may be manufactured by using one kind of resin alone, or may be manufactured by using two or more kinds of resins in combination. For example, the acrylic resin may be used alone, or the acrylic resin may be used in combination with another resin. The other resin may be an acrylic resin having a different monomer composition from the acrylic resin, or may be another resin having a different resin type from the acrylic resin such as polystyrene. May be.

In addition, various commonly used additives may be added to the acrylic resin and other resins as long as the effects of the present invention are not impaired. Examples of the additives include stabilizers, antioxidants, ultraviolet absorbers, light stabilizers, heat stabilizers, colorants, foaming agents, lubricants, release agents, antistatic agents, light diffusing agents, flame retardants, and polymerizations. Examples include suppressors, flame retardant aids, and reinforcing agents. These additives may be used alone or in combination of two or more.

When the additive is added, its content is preferably about 0.005% by weight or more and 30% by weight or less based on the resin.

Rubber particles may be added to the acrylic resin. By adding the rubber particles, impact resistance, tear resistance, prying resistance, breaking resistance and the like of the shaped resin sheet are improved. Here, as the rubber particles, for example, acrylic rubber particles, butadiene rubber particles, styrene-butadiene rubber particles, and the like can be used. Among them, from the viewpoint of impact resistance, weather resistance, and durability, acrylic is used. Rubber particles are preferably used.

For example, the acrylic rubber particles are particles (elastic particles) containing an elastic polymer mainly composed of an acrylic ester as a rubber component, and may be particles having a single layer structure composed of only the elastic polymer. However, it may be a particle having a multilayer structure having a layer of this elastic polymer and, for example, a layer of a polymer mainly containing methacrylic acid ester. In terms of the surface hardness, is preferably a particle having a multilayer structure.

Further, this elastic polymer may be a homopolymer of acrylic acid ester, or may be a copolymer of 50% by weight or more of acrylic acid ester and 50% by weight or less of other monomers. Good. Here, an alkyl ester of acrylic acid is usually used as the acrylic ester.

The preferred monomer composition of the elastic polymer mainly composed of acrylic acid ester is 50% by weight or more and 99.9% by weight or less of alkyl acrylate and 0% by weight or more and 49% by weight of alkyl methacrylate, based on all the monomers. 1.9 wt% or less, monofunctional monomers other than these are 0 wt% or more and 49.9 wt% or less, and polyfunctional monomers are 0.1 wt% or more and 10 wt% or less (however, the total is Is 100% by weight).

Here, the alkyl acrylate in the elastic polymer is, for example, the same as the example of the alkyl acrylate mentioned above as the monomer component of the methacrylic resin, and the number of carbon atoms of the alkyl group is usually 1 to 8 , Preferably 4-8.

Further, the alkyl methacrylate in the elastic polymer is, for example, the same as the example of the alkyl methacrylate mentioned above as the monomer component of the methacrylic resin, and the carbon number of the alkyl group is usually 1 to 8, It is preferably 1 to 4.

Examples of monofunctional monomers other than alkyl acrylate and alkyl methacrylate in the elastic polymer include styrene-based monomers such as styrene, α-methylstyrene, and vinyltoluene; cyanide such as acrylonitrile and methacrylonitrile. Alkenyl; (meth)acrylic acid; maleic anhydride; N-substituted maleimide and other compounds having one polymerizable carbon-carbon double bond (monofunctional monomer) in the molecule, such as styrene and α. -Styrene monomers such as methylstyrene and vinyltoluene are preferably used.

Examples of the polyfunctional monomer in the elastic polymer include polyunsaturated carboxylic acid esters of polyhydric alcohols such as ethylene glycol dimethacrylate, butanediol dimethacrylate, and trimethylolpropane triacrylate; allyl acrylate, allyl methacrylate. , Alkenyl esters of unsaturated carboxylic acids such as allyl cinnamate; alkenyl esters of polybasic acids such as diallyl phthalate, diallyl maleate, triallyl cyanurate, triallyl isocyanurate; aromatic polyalkenyl compounds such as divinylbenzene Compounds (polyfunctional monomers) having at least two polymerizable carbon-carbon double bonds in the molecule thereof are exemplified, and among them, alkenyl esters of unsaturated carboxylic acids and alkenyl esters of polybasic acids are preferably used. ..

As the alkyl acrylate, the alkyl methacrylate, the monofunctional monomer other than these, and the polyfunctional monomer in the above elastic polymer, two or more of them may be used, respectively, if necessary.

When a multi-layered acrylic rubber particle is used, a preferable example thereof is a layer of a polymer mainly composed of a methacrylic ester outside the elastic polymer layer mainly composed of the above-mentioned acrylic ester. That has at least a two-layer structure having an inner layer of the above-mentioned elastic polymer mainly composed of an acrylic ester and an outer layer of a polymer mainly composed of a methacrylic ester. Here, the above-mentioned alkyl methacrylate can be usually used as the methacrylic acid ester which is a monomer component of the polymer of the outer layer.

Further, the polymer of the outer layer is usually formed in a proportion of 10 parts by weight or more and 400 parts by weight or less, preferably 20 parts by weight or more and 200 parts by weight or less, based on 100 parts by weight of the elastic polymer of the inner layer. When the amount of the polymer in the outer layer is 10 parts by weight or more with respect to 100 parts by weight of the elastic polymer in the inner layer, aggregation of the elastic polymer is less likely to occur, and the transparency of the patterning resin sheet made of an acrylic resin is reduced. Will be good.

A preferred monomer composition of the polymer of the outer layer is, based on all monomers, 50% by weight or more and 100% by weight or less of alkyl methacrylate, 0% by weight or more and 50% by weight or less of alkyl acrylate, and other than these. The content of the monofunctional monomer is 0% by weight or more and 50% by weight or less, and the content of the polyfunctional monomer is 0% by weight or more and 10% by weight or less (however, the total is 100% by weight).

The alkyl methacrylate in the polymer of the outer layer is, for example, the same as the example of the alkyl methacrylate mentioned above as the monomer component of the methacrylic resin, and the carbon number of the alkyl group is usually 1 to 8, preferably Is 1 to 4. Of these, methyl methacrylate is preferably used.

The alkyl acrylate in the polymer of the outer layer is, for example, the same as the example of the alkyl acrylate mentioned above as the monomer component of the methacrylic resin, and the carbon number of the alkyl group is usually 1 to 8, preferably Is 1 to 4.

Examples of the monofunctional monomer other than the alkyl methacrylate and the alkyl acrylate in the polymer of the outer layer are the same as the examples of the monofunctional monomer described above, and the polyfunctional monomer is For example, it is the same as the above-mentioned examples of the polyfunctional monomer.

It should be noted that the alkyl methacrylate, the alkyl acrylate, the monofunctional monomer other than these, and the polyfunctional monomer in the above-mentioned polymer of the outer layer may be used in combination of two or more thereof, if necessary. ..

As a preferred example of the multi-layered acrylic rubber particles, the inner layer of the above-mentioned two-layer structure is an elastic polymer layer mainly composed of the above-mentioned acrylic acid ester, and inside the layer of the acrylic polymer mainly composed of the methacrylate ester. Those having a combined layer, that is, the innermost layer of the polymer mainly composed of methacrylic acid ester, the intermediate layer is the layer of the elastic polymer mainly composed of acrylic ester described above, It is also possible to exemplify at least a three-layer structure in which the outermost layer is a polymer layer mainly composed of Here, the above-mentioned alkyl methacrylate is usually used as the methacrylic acid ester which is the monomer component of the polymer of the innermost layer. Further, the polymer of the innermost layer is usually formed in a proportion of 10 parts by weight or more and 400 parts by weight or less, preferably 20 parts by weight or more and 200 parts by weight or less, based on 100 parts by weight of the elastic polymer of the intermediate layer.

The preferred monomer composition of the polymer of the innermost layer is, based on the total monomers, 70% by weight or more and 100% by weight or less of alkyl methacrylate, 0% by weight or more and 30% by weight or less of alkyl acrylate, and other than this. 0% by weight to 30% by weight of the monofunctional monomer and 0% by weight to 10% by weight of the polyfunctional monomer (however, the total is 100% by weight).

The alkyl methacrylate in the polymer of the innermost layer is, for example, the same as the example of the alkyl methacrylate mentioned above as the monomer component of the methacrylic resin, and the carbon number of the alkyl group is usually 1 to 8, It is preferably 1 to 4. Of these, methyl methacrylate is preferably used.

Further, the alkyl acrylate in the polymer of the innermost layer is, for example, the same as the example of the alkyl acrylate mentioned above as the monomer component of the methacrylic resin, and the carbon number of the alkyl group is usually 1 to 8, preferably 1-4.

Examples of the monofunctional monomer other than the alkyl methacrylate and the alkyl acrylate in the polymer of the innermost layer are, for example, the same as the examples of the monofunctional monomer described above, and the polyfunctional monomer Examples are the same as the examples of the polyfunctional monomer mentioned above.

It should be noted that the alkyl methacrylate, the alkyl acrylate, the monofunctional monomer and the polyfunctional monomer other than these in the above-mentioned polymer of the innermost layer may be used in combination of two or more thereof, if necessary. ..

Acrylic rubber particles can be prepared by polymerizing the monomer component of the above-described elastic polymer mainly composed of an acrylate ester in at least one step reaction by an emulsion polymerization method or the like. At that time, as described above, when a polymer layer mainly containing methacrylic acid ester is formed on the outer side of the elastic polymer layer, the monomer component of the polymer of the outer layer is added to the elastic layer. In the presence of the polymer, polymerization may be carried out by at least one step reaction by an emulsion polymerization method or the like to graft onto the elastic polymer.

Further, as described above, in the case of further forming a layer of a polymer mainly containing a methacrylic acid ester inside the layer of the elastic polymer, first, the monomer component of the polymer of the innermost layer is formed. Are polymerized in at least one stage reaction by an emulsion polymerization method or the like, and then, in the presence of the obtained polymer, the monomer component of the elastic polymer is reacted in at least one stage reaction by an emulsion polymerization method or the like. The polymer component of the innermost layer is grafted onto the polymer, and in the presence of the elastic polymer obtained, the monomer component of the polymer of the outermost layer is subjected to at least one step by an emulsion polymerization method or the like. The elastic polymer may be grafted by polymerizing by the reaction of. When the polymerization of each layer is performed in two or more stages, the monomer composition in each stage may be within the above-described predetermined range in all cases.

Regarding the particle size of the acrylic rubber particles, the average particle size of the layer of the elastic polymer mainly containing acrylate ester in the rubber particles is preferably 0.01 μm or more and 0.4 μm or less, and 0.05 μm It is more preferably 0.3 μm or less and more preferably 0.07 μm or more and 0.25 μm or less. If the average particle diameter of the layer of the elastic polymer is larger than 0.4 μm, the transparency of the resin sheet made of an acrylic resin is lowered and the transmittance thereof is lowered, which is not preferable. If the average particle diameter of the layer of the elastic polymer is smaller than 0.01 μm, the surface hardness of the resin sheet is lowered and scratches are likely to occur, which is not preferable.

Incidentally, the average particle diameter, acrylic rubber particles, separately mixed with a methacrylic resin to form a film, in the cross section, dye the layer of the elastic polymer with ruthenium oxide, and observe with an electron microscope, It can be determined from the diameter of the dyed part.

That is, when acrylic rubber particles are separately mixed with methacrylic resin and the cross section thereof is dyed with ruthenium oxide, the methacrylic resin of the mother phase is not dyed, and, for example, methacrylic acid is added to the outside of the elastic polymer layer. When the ester-based polymer layer is present, the polymer of the outer layer is not dyed, and only the elastic polymer layer is dyed, and thus stained with an electron microscope. The particle diameter can be determined from the diameter of the portion observed in a circular shape. Further, when a layer of a polymer mainly containing a methacrylic acid ester is present inside the layer of the elastic polymer, the polymer of the inner layer is not dyed, and the layer of the elastic polymer on the outer side is not dyed. The cross section is observed in a dyed state, but in this case, the outer diameter, that is, the outer diameter of the elastic polymer layer may be considered.

The mixing ratio of the rubber particles to the acrylic resin is usually 45% by weight or less, preferably 10% by weight or more and 45% by weight or less, more preferably 12% by weight or more and 30% by weight or less, based on the total weight of the acrylic resin. , And more preferably 15% by weight or more and 30% by weight or less. When the compounding ratio of the rubber particles is within the above range, impact resistance is improved, so that excellent crime prevention performance can be obtained. Particularly, even when the thickness of the shaped resin sheet is small, for example, even when the thickness is about 200 μm, excellent impact resistance can be given. Since the transparency is further improved in addition to the impact resistance, the mixing ratio of the rubber particles to the acrylic resin is more preferably 15% by weight or more and 28% by weight or less.

In the present invention, the resin in which the rubber particles can be blended is not limited to the above acrylic resin. In that case, the compounding ratio of the rubber particles is 45% by weight or less, preferably 10% by weight or more and 45% by weight or less, more preferably 12% by weight or more and 30% by weight, based on the total weight of the resin contained in the shaped resin sheet. % Or less, more preferably 15% by weight or more and 30% by weight or less. Within such a range, the shaped resin sheet can be provided with excellent impact resistance. Further, since the transparency is further improved in addition to the impact resistance, the mixing ratio of the rubber particles is more preferably 15% by weight or more and 28% by weight or less.

(Convex portion of shaped resin sheet)
The convex portion formed on one surface of the shaped resin sheet suppresses, for example, the entry of summer sunlight into the room and/or the entry of winter sunlight into the room in the Northern Hemisphere of Japan. It is preferable that the cross-sectional shape is substantially triangular, from the viewpoint of providing light controllability that is acceptable without having to do so.

In particular, the convex portions formed on the shaped resin sheet cross the widthwise direction (that is, the longitudinal direction is perpendicular to the longitudinal direction of the shaped resin sheet (or the flow direction of the manufacturing of the shaped resin sheet)) between opposing edges. It is preferable that the portion of the ridge extending linearly in the (direction) has a substantially triangular cross-section when cut along the longitudinal direction.

In the present invention, "substantially triangular" means that each corner of the triangle may be an acute end or an acute angle, or may be an arcuate shape having a certain degree of curvature. It does not mean.

For example, each convex portion in the cross section of the shaped resin sheet 1 shown in FIGS. 2 and 3 has a triangular sectional shape and each corner has an acute end (or an acute angle), but the present invention is not limited to this. However, each corner of the triangular cross section may have a rounded arc shape having a certain degree of curvature.

When the dimming member is used upright, this convex portion (more specifically, the protruding portion whose cross section is substantially triangular) extends in the width direction (horizontal direction) orthogonal to the longitudinal direction (vertical direction). Preferably.

In addition, in the embodiment shown in FIGS. 2 and 3, in addition to the convex portion of the shaped resin sheet 1, the valley portion is also an acute end (or an acute angle), but this valley portion also has an arc shape having a curvature. It may have a shape.

Further, in the present invention, a flat region may be provided in a valley portion between the convex portions, and preferably, it is parallel to the convex portion (more specifically, a ridge portion having a substantially triangular cross section). You may have the strip|belt-shaped plane area|region arrange|positioned by the width direction.

The convex portion having a substantially triangular cross-section suppresses the incidence of summer sunlight into the room and/or allows the incidence of winter sunlight without suppressing the incidence of indoor sunlight. From the viewpoint of obtaining the following, the two base angles 2 formed at the base of the triangle (that is, the straight line connecting both ends of the bottom of the triangle) have one base angle 2a (hereinafter, referred to as "first base angle 2a"). Is more than 0° and less than 90°, and the other bottom angle 2b (hereinafter sometimes referred to as “second bottom angle 2b”) is more than 0° and 90° or less. More preferably, the one bottom angle 2a is 1° or more and 40° or less, and the second bottom angle 2b is 30° or more and 90° or less.

The first base angle 2a can be appropriately set in consideration of the technical matters described later, and is more preferably 1° or more and 40° or less.

In addition, such a light control member may have visible streaks on the appearance (for example, when viewed from the surface opposite to the surface having the convex portion), but from the viewpoint of suppressing the visual recognition of the streaks, The base angle 2b is particularly preferably 90°.

As shown in FIG. 2, the height (H) of the convex portions is preferably 1 μm or more and 1 cm or less, and more preferably 5 μm or more and 1 cm or less. If the height (H) of the convex portion is less than 1 μm, it may be difficult to shape the convex portion on the surface of the resin sheet at the time of manufacturing the shaped resin sheet. The thickness may become too thick and make it heavy.

The pitch interval (P), which is the distance between the vertices of adjacent convex portions (or the distance between valley portions) is preferably 10 μm or more and 10 cm or less, and more preferably 50 μm or more and 10 cm or less. preferable. If the pitch interval (P) is less than 10 μm, it may be difficult to form a convex portion on the surface of the resin sheet at the time of manufacturing the shape forming resin sheet, and as shown in FIG. When the pitch interval (P) exceeds 10 cm, the height (H) of the convex portion becomes too high and the thickness of the light control member may become too thick in the shaped resin sheet set to an angle.

By setting the height (H) and the pitch interval (P) in the convex portions within predetermined ranges, the convex portions can be easily formed on the shape-imparting resin sheet, and the shape-imparting resin sheet can be easily manufactured. In addition, it is possible to prevent the light control member from becoming too thick. The light control member including at least one, preferably two, of the shaping resin sheet is easy to manufacture the shaping resin sheet which is a constituent member thereof, and the thickness thereof can be suppressed. In addition to the dimming performance that is acceptable without suppressing the incidence of summer sun light into the room and/or without suppressing the incidence of winter sun light into the room, an adhesive layer and It becomes easy to use as a window member together with the transparent plate member.

The thickness of the shaped resin sheet is, for example, 150 μm or more, preferably 200 μm or more and 650 μm or less, more preferably 200 μm or more and 500 μm or less. When the thickness of the shape-imparting resin sheet is within the above range, the performance such as impact resistance, prying resistance, and breaking resistance is improved, and excellent crime prevention performance can be provided. Further, if the thickness of the shaping resin sheet exceeds 650 μm, it may be difficult to manufacture a large shaping resin sheet, and it may be difficult to provide a large panel having crime prevention performance. Further, since the transparency is further improved in addition to the impact resistance, the thickness of the shaped resin sheet is more preferably 200 μm or more and less than 500 μm.

In the present invention, the thickness of the shape-imparting resin sheet means the distance from the surface of the shape-imparting resin sheet having no convex portion (the surface opposite to the surface having the convex portion) to the bottom of the convex portion. However, for example, the distance is indicated by L in FIGS. 2 and 3.

The shaped resin sheet that can be used in the present invention is preferably transparent when visually observed. In the present invention, the term that the shape-imparting resin sheet is transparent means that the total light transmittance of the shape-imparting resin sheet measured in accordance with JIS K7361-1 is 3 mm when the thickness of the shape-imparting resin sheet 1 is 3 mm. , 80% or more, preferably 90% or more, or the haze of the above-mentioned shaped resin sheet measured according to JIS K7136 is 10% or less, preferably 5% or less.

<Method of manufacturing shaped resin sheet>
The method for producing a shaped resin sheet is not particularly limited as long as it is a method capable of producing a shaped resin sheet having a predetermined convex portion on one surface, for example, using the above-mentioned resin as a raw material resin, Examples thereof include a method of cutting a flat plate, a melt extrusion molding method, a press molding method, an injection molding method, and a cast polymerization method. Among these, the melt extrusion molding method, the press molding method, the injection molding method, and the cast polymerization method are preferable, and the melt extrusion molding method and the press molding method are more preferable.

(Melting extrusion method)
The method for producing a shaped resin sheet by the melt extrusion molding method is, for example, a step of extruding a raw material resin into a sheet shape by continuously extruding it from a die in a heating and melting state, and the sheet material, for example, A first pressing step (or a shaping step) that is sandwiched between a first pressing roll and a second pressing roll (or a shaping roller), and a conveying step that conveys the sheet-like material while being in close contact with the second pressing roll. And a second pressing step (or a shaping step) of sandwiching the conveyed sheet material between the second pressing roller and the third pressing roller. According to this manufacturing method, since a convex portion can be formed on one surface of the resin sheet in the process of molding the shaped resin sheet, a separate secondary surface for forming the convex portion on one surface of the resin sheet is used. No processing step is required, and the shaped resin sheet can be easily and continuously obtained.

(Press molding method)
In the method for producing a shaped resin sheet by the press molding method, for example, a sheet or pellets made of a raw material resin is plasticized and melted, and this is pressed between molds and cooled. As a result, a shaped resin sheet can be obtained as a molded product.

(Injection molding method)
The method for producing a shaped resin sheet by the injection molding method is, for example, an injection molding machine including a mold clamping unit and an injection unit, and a mold for molding into a desired shape of the shaped resin sheet. Is injected into a mold, cooled and solidified. As a result, a shaped resin sheet can be obtained as an injection molded body.

(Cast polymerization method)
The method for producing the shaped resin sheet by the cast polymerization method is, for example, a cell casting method in which a polymer (raw material resin monomer) is injected into a cell to polymerize, a continuous casting method using a pair of endless belts facing each other, and the like. Are listed. The cell used in the cell casting method is composed of, for example, two glass plates and a sealing material such as a soft vinyl chloride tube, and the distance between the cells is appropriately adjusted so that a shaped resin sheet having a desired thickness can be obtained. Can be done. Examples of the method for producing the shaped resin sheet include bulk polymerization such as cast polymerization, and suspension polymerization, emulsion polymerization, dispersion polymerization, and the like. Among these, the bulk polymerization such as the cast polymerization method is preferable from the viewpoint of good appearance and the productivity of, for example, a large-sized plate-shaped polymer.

Hereinafter, the method and apparatus for manufacturing the shaped resin sheet will be described in more detail with reference to FIG. 4, for example.

<Manufacturing device for shaped resin sheet>
The manufacturing apparatus used in the method for manufacturing the shaped resin sheet, for example, a die for continuously extruding the resin in a heated and molten state to obtain a sheet-like material, a plurality of pressing rolls, and the sheet-like material of the pressing roll. It is provided with a shaping roll that forms a convex portion on the surface of the sheet-like material by sandwiching it between them. For example, FIG. 4 is a schematic diagram of a manufacturing apparatus that can be used in a method for manufacturing a shaped resin sheet that can be used in an embodiment of the panel of the present invention. The apparatus shown in FIG. 4 includes a die 4 for continuously extruding a resin in a heated and molten state to obtain a sheet-like material, and a pressing roll 5. The pressure roll 5 includes, for example, a first pressure roll 5a for pressing a sheet-like material, a second pressure roll 5b, and a third pressure roll 5c. For example, a transfer mold 6 is provided on the surface of the second pressure roll 5b. By sandwiching the sheet-like material between the first pressing roll 5a and/or the third pressing roll 5c and the second pressing roll (or shaping roll) 5b provided with the transfer mold 6, It is possible to obtain the shaped resin sheet 1 having the surface shape shaped as described above.

In addition to the pressing roll 5, any roll may be provided. Such a roll is in contact with the sheet-like material, and for example, a guide roll (touch roll) for transporting the sheet-like material to the first pressing roll or a sheet-like material is brought into close contact with the second pressing roll. For example, a touch roll can be used.

The method for producing a shaped resin sheet of the present invention includes, for example, a step of extruding a resin into a sheet by continuously extruding a resin in a heating and melting state into a sheet, a sheet-shaped first pressing roll and a second A first pressing step of sandwiching between the pressing roll, a conveying step of conveying the sheet-like object while being in close contact with the second pressing roll, the second pressing roll and the third pressing roll of the conveyed sheet-like object And a second pressing step of sandwiching it between. According to this manufacturing method, since the convex shape is imparted to the resin sheet surface in the process of molding the resin sheet, a separate secondary processing step for imparting the convex shape to the resin sheet surface is not required, which is simple and easy. A shaped resin sheet is obtained.

(Extrusion process of sheet material)
In the step of extruding the sheet-like material, the resin is continuously extruded in a molten state from the die to produce the sheet-like material.

As the resin used in the production method of the present invention, the thermoplastic resins exemplified in the above-mentioned shape-imparting resin sheet can be used, and among them, the acrylic resin is preferably used.

Additives such as an ultraviolet absorber, a heat stabilizer, an antistatic agent, and a light diffusing agent may be added to the resin.

As a die for continuously extruding the above resin in a heat-melted state, a metal T die similar to that used in a usual extrusion molding method is used. An extruder is used to extrude the resin in a heat-melted state from the die, as in the usual extrusion molding method. The extruder may be a single screw extruder or a twin screw extruder. The resin can be heated in an extruder and sent to the die in the molten state and extruded. The resin extruded from the die can be continuously extruded as a sheet.

The sheet-like material may be a single layer or a multilayer having two or more layers. When the sheet-like material is a single layer, when the resin is extruded from the die in a heat-melted state, one kind of resin may be supplied to the die to extrude the resin. The resin may be supplied to a die and co-extruded in a laminated state. When coextruding two or more kinds of resin in a laminated state, for example, a well-known two-kind three-layer distribution type feed block or the like may be used, and the resin may be supplied to the die via this.

(First pressing step)
The sheet-like material obtained in the step of extruding the sheet-like material is, for example, by the first pressing step (or the shaping step), as shown in FIG. 4, a first pressing roll 5a and a second pressing roll 5b. Can be sandwiched between at the same time. In this first pressing step, the sheet material can be imprinted with the transfer mold 6 provided on the surface of the second pressing roll 5b. In the present invention, the second pressing roll 5b provided with the transfer mold is also referred to as a shaping roll. The transfer mold provided on the surface of the mold roll is pressed against the surface of the sheet-like material, and the surface shape of the transfer mold is reversed to form the above-mentioned convex portion on the sheet-like material. As the first pressure roll and the second pressure roll, a metal roll made of a metal such as stainless steel or steel is usually used, and the diameter thereof is usually 100 mm or more and 500 mm or less. When metal rolls are used as the first and second pressing rolls, the surfaces thereof may be subjected to plating treatment such as chrome plating, copper plating, nickel plating, nickel-phosphorus plating and the like.

(Transport process)
The transporting step is a step of transporting the sheet-like material according to the rotation of the second pressure roll in a state where the sheet-like material is in close contact with the second pressure roll.

In the first pressing step and the conveying step, the sheet-like material has a temperature lower than that in the heated and melted state extruded from the die due to cooling by contact with the pressing roll and cooling by contact with outside air. In such a state that the temperature is lower than that in the heat-melted state, the sheet-like material is conveyed and provided to the next second pressing step (or shaping step). In addition, it is desirable that each pressing roll has a temperature adjusting function and can be adjusted to a desired temperature.

(Second pressing step)
In the second pressing step, the conveyed sheet material can be sandwiched between the second pressing roll 5b and the third pressing roll 5c and pressed, as shown in FIG. 4, for example. In this second pressing step, the sheet-like material is gently cooled and conveyed.

The sheet-like material, in this second pressing step, is pressed again between the second pressing roll and the third pressing roll, peeled from the second pressing roll, adheres to the third pressing roll, then the second It can be conveyed according to the rotation of the three pressing rolls. At that time, if the surface temperature of the sheet-like material is high and the sheet-like material sufficiently adheres to the third pressing roll without pressing between the second pressing roll and the third pressing roll, the second pressing roll The gap between the third pressing roll and the third pressing roll may be slightly larger than the thickness of the sheet-shaped material. The sheet-like material conveyed according to the rotation of the third pressing roll is peeled off from the third pressing roll to obtain a shaped resin sheet. Since the shaping resin sheet is gently cooled by the third pressing roll and the contact time with the third pressing roll can be stably secured, the shape given to the transfer mold 6 can be stably transferred. Becomes

The transfer mold 6 is composed of a plurality of recesses provided on the surface of the shaping roll, and the shape of the recesses is preferably the reverse of the cross-sectional shape of the projections on the surface of the obtained shaping resin sheet. When the cross-sectional shape of is a triangle, for example, a V-shaped groove corresponding to this triangular shape is preferable.

When the distance between the vertices of adjacent recesses of the shaping roll is the pitch interval (P) and the distance from the circumference of the surface of the shaping roll to the apex of the recess is the groove depth (H), the pitch interval (P) The groove depth (H) and the groove depth (H) may be set corresponding to the height (H) of the convex portions and the pitch interval (P) in the desired shaped resin sheet, and the pitch interval (P) is 10 μm or more and 10 cm or less. The groove depth (H) is preferably 1 μm or more and 1 cm or less.

As the method for producing the transfer mold, the surface of the shaping roll made of stainless steel, steel or the like is subjected to a plating treatment such as chrome plating, copper plating, nickel plating or nickel-phosphorus plating, and then the plated surface is subjected to the plating treatment. On the other hand, removal processing using a diamond bite, a metal grindstone, etc., laser processing, or chemical etching may be performed to process the shape, but the method is not particularly limited.

After the transfer mold is formed, the surface of the shaping roll may be subjected to plating treatment such as chrome plating, copper plating, nickel plating, nickel-phosphorus plating, etc., at a level that does not impair the accuracy of the surface shape.

By subjecting the surface shape (transfer die) of the shaping roll to a sheet-like material in the first pressing step, a target shaping resin sheet can be manufactured. The obtained shaped resin sheet is usually further cooled and then cut into a sheet shape, which can be used as a light control member.

In this manufacturing method, not the second pressure roll, but the first pressure roll is a shaping roll, and the sheet-like material extruded from the die is sandwiched between the shaping roll and the second pressure roll to perform shaping. Alternatively, the third pressing roll may be a shaping roll, and the sheet-like material extruded from the die may be sandwiched between the shaping roll and the second pressing roll to be shaped.

<Light control member>
In the present invention, the light control member comprises at least one, preferably two, of the above-mentioned shaping resin sheet.

Here, as an example, a schematic view of a light control member in which only one type of resin sheet is arranged is shown in FIG. 2 , and a schematic view of a light control member in which two type of resin sheet are arranged is shown. 3 shows.

In the case of using, for example, two shaping resin sheets in the light control member, as the light control member, the convex portions of the two shaping resin sheets are arranged to face each other so as to correspond to each other. It is preferable that an air layer be present between the shaped resin sheets of (see FIG. 3).

In the light control member shown in FIG. 3, the air layer 8 has a space between the shaping surfaces (that is, the surfaces having the convex portions) of the pair of shaping resin sheets 1A and 1B having the corresponding convex portions. This means that, for example, as shown in the figure, the slope 9a to the lower right and the horizontal surface 9b are repeatedly arranged. In the present embodiment, the pair of shape-imparting resin sheets 1A and 1B are arranged via the air layer 8, but the light control member in the present invention is not limited to this, and the pair of shape-imparting resin sheets 1A. Part or all of 1B and 1B may be bonded with an adhesive. That is, in the light control member that can be used in the panel of the present invention, the air layer may be filled with an adhesive, or the adhesive layer may be formed between the shaped resin sheets. When such a pair of shape-imparting resin sheets are bonded together with an adhesive, the filling of the adhesive may be performed on the entire surface having the convex portion as long as two shape-imparting resin sheets can be fixed. It may be a peripheral portion or a part thereof.

The adhesive that can be used in the present invention is not particularly limited as long as it can bond the shaped resin sheets to each other and can transmit light. For example, the adhesive described in detail below can be used. Further, in the present invention, a pressure-sensitive adhesive capable of forming a pressure-sensitive adhesive layer described in detail below may be used as such an adhesive. Therefore, in the present invention, the "adhesive layer" is not limited to those having only adhesiveness that can be composed of an adhesive, and also means a layer that can be formed from the adhesive described below. Yes, and is understood as having adhesiveness and/or tackiness.

When the pair of shape-imparting resin sheets are arranged such that the shape-imparting surfaces face each other, and preferably the protrusions are opposed to each other, it is preferable that the opposing protrusions have a point-symmetrical relationship with each other. .. For example, when the cross-sectional shape of the convex portion is a triangle, it is preferable that the opposing triangles have a point-symmetrical relationship with the midpoint of the hypotenuse of the triangle as the center of symmetry. As a result, the air layer can maintain a constant interval. When a pair of shape-imparting resin sheets are arranged so that the opposing protrusions are in a point-symmetrical relationship, that is, the pair of shape-imparting resin sheets are the protrusions of one shape-imparting resin sheet and the other shape-imparting resin. When arranging so that the valleys of the sheets (that is, the concave portions corresponding to the convex portions) are overlapped with each other, a part or all of the pair of shape-imparting resin sheets are bonded by the above-mentioned adhesive or the like. It may have been done.

For example, in the embodiment shown in FIG. 3, a light control member having a pair of shape-imparting resin sheets 1A and 1B arranged to face each other with their convex portions corresponding to each other has a surface X on one surface, It is preferable that the other surface has a surface Y, and the surface X and the surface Y are parallel to each other.

The refractive index of the resin is, for example, about 1.5 if it is an acrylic resin.

In the illustrated embodiment, the light control member has a surface 9a having an angle 2a with respect to the surface X and a surface 9b having an angle 2b with respect to the surface X and the surface Y (depending on the angle 2b, a horizontal plane as illustrated). And an air layer 8 having a constant thickness. The corner 2a of the air layer 8 (that is, the first bottom corner 2a of the triangle of the cross section of the convex portion of the shaped resin sheet) can be set in consideration of the technical matters described in detail below.

Here, a case will be described as an example in which the resins of the shape-imparting resin sheets 1A and 1B forming the light control member are both resins having a refractive index of 1.5.

Generally, when light travels from a medium (resin) having a large refractive index to a medium (air) having a small refractive index, as shown on the right side of FIG. 5, when the incident angle is small, refraction occurs at the interface between the two. In the case of this example, the refractive index of the resin is 1.5 and the refractive index of air is 1.0, so the refraction angle is larger than the incident angle. Then, as the incident angle increases, the refraction angle also increases. When the incident angle becomes a certain angle, as shown in the center of FIG. 5, the refraction angle becomes 90°, and the light does not propagate from the resin to the air side. The incident angle at this time is called a critical angle, and is represented by θ _m here. When the incident angle is further increased, as shown on the left side of FIG. 5, the light is totally reflected at the interface between the resin and the air, which is a state called total reflection.

In the case of this example, there is the following relationship between the critical angle θ _m and the refractive indices of air and resin.

sin θ _m =(refractive index of air)/(refractive index of resin)=1/1.5

According to the above formula, the critical angle at this time is θ _m =41.8°.

Here, for example, as shown in FIG. 2, in the case of a light control member including only one shaping resin sheet, an adhesive layer to be described later is provided on the surface of the shaping resin sheet which does not have a protrusion, and the present invention The light control member can be used in the panel. Then, the light control member with the adhesive layer is formed into a transparent plate member so that the adhesive layer contacts the transparent plate member, and more preferably, the bottom angle 2a is on the upper side and the bottom angle 2b is on the lower side. When pasted, when light enters from the transparent plate member to the adhesive layer at a small incident angle (angle between light and a normal to the adhesive layer surface), the light is refracted at the interface between the transparent plate member and the adhesive layer, After advancing in the pressure-sensitive adhesive layer and further refracting at the interface between the pressure-sensitive adhesive layer and the shape-imparting resin sheet 1A, it advances in the shape-imposing resin sheet 1A. Next, the light that has traveled through the shape-imparting resin sheet 1A can be refracted at the interface between the shape-imparting resin sheet 1A and the room (that is, the atmospheric layer in the room) and enter the room side.

Further, it is more preferable to provide a pressure-sensitive adhesive layer described below on the surface X of the light control member shown in FIG. 3 so that the pressure-sensitive adhesive layer contacts the transparent plate member. When the light is incident on the transparent plate member at a small incident angle (the angle formed by the light and the normal to the surface of the adhesive layer) from the transparent plate member to the transparent plate member, the light is transparent. After being refracted at the interface between the pressure-sensitive adhesive layer and the pressure-sensitive adhesive layer, it proceeds in the pressure-sensitive adhesive layer. Next, the light that has traveled through the shaping resin sheet 1A is refracted at the interface between the shaping resin sheet 1A and the air layer 8, and then proceeds through the air layer 8, and further, between the air layer 8 and the shaping resin sheet 1B. After being refracted at the interface, it can proceed through the shaped resin sheet 1B, be refracted at the interface between the surface Y and the room (that is, the atmospheric layer in the room), and be incident on the room side.

Here, in the illustrated embodiment, the second bottom angle 2b is preferably 90°, so that in any case, when the light control member is viewed from the outside or the inside of the room, it is difficult to visually recognize streaks in the appearance. Become.

Furthermore, when the light control member includes only one shaping resin sheet and light is incident on the adhesive layer from the transparent plate member at a large incident angle, the light is an interface between the transparent plate member and the adhesive layer. After being refracted by, the light travels in the pressure-sensitive adhesive layer, and further at the interface between the pressure-sensitive adhesive layer and the shape-imparting resin sheet 1A, and then moves in the shape-imposing resin sheet 1A. Next, the light that has traveled through the shape-imparting resin sheet 1A can be totally reflected at the interface between the shape-imparting resin sheet 1A and the atmospheric layer in the room, so that the light entering the room can be suppressed.

Further, when the light control member is formed by arranging a pair of shaping resin sheets as shown in FIG. 3, and the light is incident on the adhesive layer from the transparent plate member at a large incident angle, Is refracted on the surface X, then travels through the shaping resin sheet 1A, is totally reflected at the interface between the shaping resin sheet 1A and the air layer 8, and the light is incident on the air layer 8 and the shaping resin sheet 1B. Therefore, the entrance of light to the indoor side can be suppressed.

In the present invention, the angle of incidence from the outside of the room to the surface X when the light is not incident on the atmospheric layer in the room due to total internal reflection is called the specific angle.

The specific angle can change according to the inclination angle 2a. For example, when a resin having a refractive index of 1.5 is used as the resin of the shaping resin sheets 1A and 1B that form the light control member, the specific angle is 63.9° when the inclination angle 2a is 5°. When the angle 2a is 10°, the specific angle is 52.2°, and when the inclination angle 2a is 20°, the specific angle is 33.9°.

For example, when the inclination angle 2a is 7°, the specific angle is about 60° when the refractive index of the shaped resin sheet is 1.5. Therefore, light incident from above at an angle larger than 60°, for example, an angle of 70° from the direction perpendicular to the adhesive layer, is refracted when entering the adhesive layer, and the light is incident on the interface with the air layer in the room or the air layer. 8 can be incident at an angle of 45°. Since this angle is larger than the critical angle (θ _m =41.8°) at the interface between the shaped resin sheet 1A and the air layer in the room or the interface with the air layer 8, total reflection occurs and light is emitted at this interface. Can be reflected. The reflected light is reflected in the shaping resin sheet 1A and cannot enter the atmospheric layer or the air layer 8 or the shaping resin sheet 1B in the room.

On the other hand, for light incident at an angle smaller than the specific angle 60°, the interface between the patterning resin sheet 1A and the indoor air layer or the air layer 8 is applied to the indoor air layer or the air layer 8. At the interface of, the light can enter the atmosphere layer or the air layer 8 in the room from the patterning resin sheet 1A at an angle smaller than the critical angle, so that the total reflection of the light does not occur and the light can be refracted at each interface.

Further, when the air layer 8 is present, reverse refraction may occur when entering the shaped resin sheet 1B from the air layer 8, so if the width of the air layer 8 is small, it is hardly affected by the air layer 8. It can be transmitted like ordinary glass. Therefore, the thickness of the air layer 8 is preferably 2 mm or less. The lower limit of the thickness of the air layer 8 is about 0.01 mm from the viewpoint that the role of the air layer 8 can be exhibited. When the thickness of the air layer 8 is within the above range, the outside scenery looks like ordinary glass when viewed from the inside to the outside. Further, when a resin having a large refractive index is used, the inclination angle of the air layer 8 can be made smaller.

For example, in the embodiment shown in FIGS. 2 and 3, the refractive index of the resin of each of the shaping resin sheets 1A and 1B forming the light control member is 1.5, and the inclination angle 2a of the air layer 8 (the shaping resin sheet). An adhesive layer is provided on the surface (for example, the surface X) of the shaping resin sheet of the light control member having the first base angle 2a) of the triangle of the cross section of the convex portion of 7°, which has no projection, As described in detail below, a panel is formed by joining with a transparent plate member, and the light control member is in a standing state as shown in FIGS. 2 and 3, for example, a window glass facing south in Tokyo. Can be used as an alternative to. At this time, when the altitude of the sun is high and the incident angle from the outdoor side to the surface having no convex portion of the shaping resin sheet (for example, the surface X) is larger than 60°, for example, between April and September. Then, it is possible to suppress the incidence of sunlight on the indoor side, the altitude of the sun is low, and the incident angle from the outdoor side to the surface not having the convex portion of the shaping resin sheet (for example, the surface X) is 60. When the angle is smaller than 0°, for example, from October to March, the incidence of sunlight on the indoor side is not suppressed, and the incidence can be allowed.

In this specification, summer means April to September when the sun is high, and winter means October to March when the sun is low. This definition applies in the Northern Hemisphere, and vice versa in the Southern Hemisphere. Summer means October to March when the sun is high, and Winter means April to September when the sun is low. To do.

For example, in places other than Tokyo (however, in the northern hemisphere), in order to suppress sunlight from entering the indoor side in summer and to allow sunlight to enter the indoor side in winter without suppressing it, Since the altitude of the sun depends on the latitude, the inclination angle 2a may be appropriately set according to the latitude of the place where the panel of the present invention is installed. In the place where the latitude is larger than Tokyo, the inclination angle 2a is 7°. The angle of inclination 2a may be smaller than 7° in a place where the latitude is smaller than that of Tokyo. In addition, in order to set the inclination angle 2a, the first base angle 2a of the triangle of the cross section of the convex portion of the shaped resin sheet may be set.

Further, when the altitude of the sun is high and the incident angle is higher than the specific angle, the incidence of sunlight on the indoor side can be suppressed, but the light incident from below the specific angle is transmitted through normal glass. As well as being transparent, the outside scenery can be seen just like a normal glass window.

In the panel of the present invention, the outer peripheral portion (that is, the edge portion), particularly the light control member, may be surrounded by a frame member or the like. Since the outer peripheral portion is surrounded by the frame member, the present invention is easy to handle by supporting the light control member, and when the light control member is composed of a pair of shape-imparting resin sheets, a space between these shape-imparting resin sheets is provided. It becomes easy to keep the thickness of the air layer or the adhesive layer constant.

The size and shape of the frame member that can be used in the present invention and the material are not particularly limited.

The panel of the present invention can be usually used in a state where the light control member is stood upright, that is, in a vertical posture. At this time, the solar power generation panel may be installed so as to face the lower end surface of the light control member. preferable. Here, sunlight having a large incident angle that is incident on the light control member used in the panel of the present invention is, as described above, reflected by the convex portion of the light control member and easily collected in the downward direction of the light control member. The solar power generation panel arranged to face the lower end surface of the light control member enables efficient power generation. The light control member used in the panel of the present invention and the photovoltaic panel are preferably in contact with each other, and may be bonded by an adhesive layer described in detail below (in the present invention, such "adhesive layer" "Is sometimes called "bonding layer" or "bonding layer").

Here, when the light control member includes only one shaping resin sheet, it is preferable to use the light control member such that the surface having the convex portion is on the indoor side. For example, when the light control member that can be used in the present invention shown in FIG. 2 is disposed on the indoor side, an adhesive layer is provided on the surface of the light control member that does not have the convex portion of the shaping resin sheet. Alternatively, when the light control member that can be used in the present invention is arranged on the outdoor side, an adhesive layer is provided on the surface of the light control member having the convex portion of the shape-imparting resin sheet.

When the light control member includes two shaping resin sheets as shown in FIG. 3, an adhesive layer may be provided on the surface X of the light control member, or an adhesive layer may be provided on the surface Y of the light control member. Good.

The shape-imparting resin sheet included in the light control member that constitutes the panel of the present invention is not limited to the above-mentioned one, and is discontinuous in the width direction, for example, on one surface within a range that does not impair the effects of the present invention. You may use the shaping|molding resin sheet in which the convex part was formed.

<Adhesive layer>
The pressure-sensitive adhesive member in the panel of the present invention is such that the above-mentioned light control member can be attached to a transparent plate member described in detail below, as long as it can achieve the absolute value of the refractive index difference. Good. The material capable of forming such an adhesive layer is not particularly limited, but as described above, a material capable of forming an adhesive layer having a refractive index of 1.20 to 1.90 is preferable, and examples thereof include a pressure-sensitive adhesive and an active agent. Examples of the adhesive include energy ray-curable adhesives and thermosetting adhesives. Further, as the material capable of forming the adhesive layer, an adhesive such as an active energy ray-curable adhesive or a thermosetting adhesive may be used.

Therefore, in the present invention, the “adhesive layer” means not only a layer that can be formed from an adhesive but also a layer that can be formed from an adhesive and has adhesiveness and/or adhesiveness. Understood as a thing.

The thickness of the adhesive layer is, for example, 1 μm or more and 10 mm or less, preferably 5 μm to 1 mm, more preferably 10 μm to 500 μm, and even more preferably 10 μm to 150 μm. When the thickness of the adhesive layer is within the above range, performances such as impact resistance, prying resistance, and breaking resistance are improved, and excellent crime prevention performance can be provided.

As the pressure-sensitive adhesive, a conventionally known one can be adopted, for example, an adhesive containing an acrylic resin as a base resin (acrylic adhesive), an adhesive containing a rubber resin as a base resin. (Rubber adhesive), adhesive containing urethane resin as base resin (urethane adhesive), adhesive containing silicone resin as base resin (silicone adhesive), polyvinyl ether resin as base material Examples of the adhesive include a resin adhesive (polyvinyl ether adhesive). Among these, an acrylic pressure-sensitive adhesive, which is a pressure-sensitive adhesive using an acrylic resin having excellent transparency, weather resistance and heat resistance as a base resin, is preferable.

The pressure-sensitive adhesive can be attached to the surface of an adherend (for example, a glass plate, a resin plate, etc.) by applying pressure, and if the adherend has sufficient strength. It is a viscoelastic body that can be peeled off with almost no trace.

As the acrylic pressure-sensitive adhesive, for example, a (meth)acrylic acid ester such as butyl (meth)acrylate, ethyl (meth)acrylate, isooctyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate is used as a monomer. The thing which uses the resin formed by superposition|polymerization as a base resin is mentioned. Such base resins may be used alone, in combination of two or more kinds, or may be used in which two or more kinds of (meth)acrylic acid ester are copolymerized. Furthermore, polar monomers may be copolymerized with these base resins. Examples of polar monomers include (meth)acrylic acid, 2-hydroxypropyl (meth)acrylate, hydroxyethyl (meth)acrylate, (meth)acrylamide, N,N-dimethylaminoethyl (meth)acrylate, glycidyl ( Examples thereof include monomers having a functional group such as a carboxyl group, a hydroxyl group, an amide group, an amino group and an epoxy group, such as (meth)acrylate.

These acrylic pressure-sensitive adhesives can be used alone or of course, but usually a crosslinking agent can be used in combination. As the cross-linking agent, a divalent or polyvalent metal salt that forms a carboxylic acid metal salt with a carboxyl group, or a polyamine compound that forms an amide bond with a carboxyl group Examples thereof include polyepoxy compounds and polyol compounds, which form an ester bond with a carboxyl group, and polyisocyanate compounds, which form an amide bond with a carboxyl group. Among them, polyisocyanate compounds are widely used as organic crosslinking agents.

Examples of the rubber adhesive include styrene-isobutylene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS) and other styrene-based thermoplastic elastomers, natural rubber, butyl rubber, isobutylene rubber, Examples thereof include those using isopropylene rubber as a base resin. These base resins may be used alone or in combination of two or more.

As the urethane adhesive, for example, a polyurethane resin obtained by reacting an active hydrogen component containing at least a polyol with a polyisocyanate crosslinking agent using a catalyst such as a tertiary amine compound or an organometallic compound The base resin may be used. A two-component curing type urethane adhesive obtained by further reacting a polyurethane resin with a polyisocyanate crosslinking agent is also preferably used. In the case of the combination of the polyol and the polyisocyanate-based cross-linking agent, since the cross-linking density can be easily controlled, the adhesive force of the pressure-sensitive adhesive containing the polyurethane-based resin can be easily adjusted. In addition, since the cross-linking density does not change with time, the adhesive strength does not change with time.

As the silicone-based pressure-sensitive adhesive, those composed of a polymer of silicone gum and silicone resin can be used, and may be a platinum catalyst-curable type or a peroxide-curable type. It may be.

As the polyvinyl ether adhesive, polyethyl vinyl ether, polypropyl vinyl ether, polybutyl vinyl ether, poly-2-ethylhexyl vinyl ether, etc. can be used as the base resin.

Here, in the above-mentioned pressure-sensitive adhesive capable of forming a pressure-sensitive adhesive layer, in addition to the above-mentioned base resin and cross-linking agent, if necessary, pressure-sensitive adhesive force of the pressure-sensitive adhesive, cohesive force, viscosity, elastic modulus, glass Appropriate additives such as natural or synthetic resins, tackifying resins, antioxidants, dyes, pigments, defoamers, corrosives, photopolymerization initiators, etc. for adjusting the transition temperature and the like. Can also be blended. Furthermore, an adhesive layer having light scattering properties can be prepared by containing fine particles. Moreover, an antioxidant, an ultraviolet absorber, or the like may be blended in the adhesive layer that can be formed from the above-mentioned adhesive. Examples of the ultraviolet absorber include salicylic acid ester compounds, benzophenone compounds, benzotriazole compounds, cyanoacrylate compounds and nickel complex salt compounds.

The active energy ray-curable adhesive has a property of being cured by being irradiated with active energy rays such as ultraviolet rays and electron beams, and has adhesiveness even before irradiation with the active energy rays and has a property of being adhered to an adherend. For example, an adhesive having a property of being in intimate contact and being cured by irradiation with an active energy ray so that the adhesive force can be adjusted. As the active energy ray-curable adhesive, it is particularly preferable to use an ultraviolet-curable adhesive. An active energy ray-curable pressure-sensitive adhesive generally contains an acrylic pressure-sensitive adhesive and an active energy ray-polymerizable compound as main components. Usually, a crosslinking agent is further added, and if necessary, a photopolymerization initiator or a photosensitizer may be added.

The thermosetting adhesive has the property of being cured by heating, and has the property of having adhesiveness even before heating and being in close contact with the adherend and being cured by heating so that the adhesion can be adjusted. For example, it has an adhesive. The thermosetting adhesive generally contains an acrylic adhesive and a thermopolymerizable compound as main components. Usually, a crosslinking agent is further added, and if necessary, a thermal polymerization initiator can be added.

The active energy ray-curable adhesive has a property of being cured by being irradiated with active energy rays such as ultraviolet rays and electron rays. The active energy ray-curable adhesive is preferably a so-called solventless adhesive which does not contain an organic solvent. Adhesives utilizing photo-radical polymerization reaction such as (meth)acrylate adhesives, ene/thiol adhesives, epoxy adhesives, oxetane adhesives, epoxy/oxetane adhesives, unsaturated polyester adhesives, etc. Examples of such adhesives include epoxy-based, vinyl ether-based, and oxetane-based adhesives that utilize a photocationic polymerization reaction.

The thermosetting adhesive has a property of being cured by heating. As the thermosetting adhesive, a so-called solvent-free adhesive containing no organic solvent is preferable. Thermosetting adhesives include adhesives that cure at room temperature or higher, and specifically include epoxy adhesives, polyurethane adhesives, (meth)acrylate adhesives, ene/thiol adhesives, Examples thereof include silicone-based adhesives, polyester-based adhesives, unsaturated polyester-based adhesives, cyanoacrylate-based adhesives, nylon-based adhesives and modified olefin-based adhesives.

Examples of other adhesives include aqueous adhesives using a polyvinyl alcohol-based resin aqueous solution, an aqueous two-component urethane-based emulsion adhesive, and the like. Among them, a polyvinyl alcohol-based resin aqueous solution is preferable. Polyvinyl alcohol-based resins include vinyl alcohol homopolymers obtained by saponifying polyvinyl acetate, which is a homopolymer of vinyl acetate, as well as copolymers of vinyl acetate and other monomers copolymerizable therewith. Examples thereof include vinyl alcohol-based copolymers obtained by saponifying a polymer, and modified polyvinyl alcohol-based polymers obtained by partially modifying their hydroxyl groups. A polyvalent aldehyde, a water-soluble epoxy compound, a melamine compound, a zirconia compound, a zinc compound or the like may be added to the water-based adhesive as an additive.

The pressure-sensitive adhesive layer may contain, in addition to the pressure-sensitive adhesive component and/or the adhesive component described above, one or more other components as long as the effects of the present invention are not impaired. Examples of other components include other polymer components, softening agents, antioxidants, curing agents, plasticizers, fillers, thermal polymerization initiators, photopolymerization initiators, ultraviolet absorbers, light stabilizers, and colorants ( Pigments and dyes), solvents (organic solvents), surfactants (eg ionic surfactants, silicone-based surfactants, fluorine-based surfactants, etc.), cross-linking agents (eg polyisocyanate-based cross-linking agents, silicones) Cross-linking agent, epoxy cross-linking agent, alkyl etherified melamine cross-linking agent, etc.). The thermal polymerization initiator and the photopolymerization initiator may be included in the material for forming the base resin.

As a method for forming an adhesive layer on one surface of the light control member, a conventionally known method can be used, for example, casting method, Meyer bar coating method, gravure coating method, comma coater method, doctor blade method, A method of applying a material for forming an adhesive layer on one surface of the light control member by a die coating method, a dip coating method, a spray method, etc.; a material for forming an adhesive layer on one surface of the light control member in a sheet form. Examples of such a method include a method of sticking the above-mentioned pressure-sensitive adhesive sheet or a pressure-sensitive adhesive sheet obtained by applying a material for forming a pressure-sensitive adhesive layer on both surfaces of the sheet using any sheet as a base material. A commercially available product may be used as the adhesive or the adhesive sheet, and examples of the commercially available adhesive or the adhesive sheet include NSS manufactured by Shin-Tak Kasei Co., Ltd. and P-3132 manufactured by Lintec Co., Ltd.

As a method of forming an adhesive layer from a water-based adhesive, there is a method of applying a water-based adhesive to one surface of the light control member, and then reducing the water content from the water-based adhesive by drying or the like, preferably removing the water. Can be mentioned. Moreover, as a method of applying the water-based adhesive, the same method as the method of applying the material for forming the adhesive layer described above and the like can be mentioned.

In the method of forming the pressure-sensitive adhesive layer from the water-based adhesive, the drying temperature is preferably 10°C to 90°C. If it is lower than 10°C, the adhesive layer and the adherend tend to be easily peeled off. If the temperature is 90° C. or higher, the water-based adhesive may deteriorate due to heat. The drying time is preferably 10 to 1000 seconds.

On one surface of the light control member that forms the adhesive layer, plasma treatment, corona treatment, ultraviolet irradiation treatment, frame (flame) treatment, in order to improve the adhesion with the material or adhesive sheet that forms the adhesive layer, Surface treatment such as saponification treatment may be appropriately performed. Examples of the saponification treatment include a method of immersing the treated surface of the light control member in an aqueous alkali solution such as sodium hydroxide or potassium hydroxide.

<Plate member>
The plate member that can be used in the panel of the present invention has a transparent plate shape (or panel shape), and may be colorless and transparent or colored and transparent.

In the present invention, the plate member being “transparent” means that the total light transmittance of the plate member measured in accordance with JIS K7361-1 is 80% or more, when the thickness of the plate member is 3 mm. It means that it is preferably 90% or more, or that the haze of the plate member measured according to JIS K7136 is 10% or less, preferably 5% or less.

The material forming the plate member is not particularly limited as long as it is transparent, and a glass plate, a resin plate or the like can be used.

Examples of the glass plate include glass plates made of glass such as soda lime glass, borosilicate glass, quartz glass, and aluminosilicate glass.

Examples of the resin plate include a resin plate made of a resin such as polymethylmethacrylate (PMMA) resin, polycarbonate (PC) resin, cycloolefin resin, and polyester resin. Among them, it is preferable to use PMMA-based resin and PC-based resin from the viewpoint of impact resistance, transparency and the like. In particular, a resin plate having impact resistance can impart high crime prevention performance to the panel.

The resin plate may have a multi-layer structure, and as the multi-layer resin plate, for example, a two-layer resin plate including a PMMA-based resin plate and a PC-based resin plate can be used. ..

The thickness of the plate member that can be used in the present invention is not particularly limited and is, for example, 0.1 mm or more and 20 mm or less, preferably 0.5 mm or more and 10 mm or less, and more preferably 1 mm or more and 5 mm or less. When the thickness of the plate member is within the above range, high impact resistance and eventually high crime prevention performance can be provided.

The dimension of the plate member that can be used in the present invention is not particularly limited, and the dimension in the longitudinal direction is, for example, 1 mm or more and 10000 mm or less, preferably 10 mm or more and 5000 mm or less, and more preferably 50 mm or more and 4000 mm or less. The dimension in the width direction (that is, the dimension in the direction perpendicular to the longitudinal direction) is, for example, 1 mm or more and 10000 mm or less, preferably 10 mm or more and 5000 mm or less, and more preferably 50 mm or more and 4000 mm or less.

The refractive index of such a transparent plate member is, for example, 1.40 or more and 1.70 or less, preferably 1.45 or more and 1.60 or less, and more preferably 1.48 or more and 1.59 or less.

In the present invention, the light control member may be disposed on the entire surface of the plate member via the adhesive layer, or the light control member may be disposed on a part of the plate member via the adhesive layer. However, from the viewpoint of light control performance and crime prevention performance, it is preferable that the light control member is arranged on the entire surface of the plate member via an adhesive layer.

When using an active energy ray-curable pressure-sensitive adhesive, as a method for attaching the above-mentioned light control member to an adherend through such an adhesive, the light control is performed through such an adhesive. Examples include a method in which a member is brought into contact with an adherend and then an active energy ray is irradiated to cure the pressure-sensitive adhesive. The light source of the active energy ray is not particularly limited, but an active energy ray having an emission distribution at a wavelength of 400 nm or less is preferable, and specifically, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, an ultrahigh pressure mercury lamp, a chemical lamp, a black light lamp. Microwave-excited mercury lamps and metal halide lamps are preferably used.

Hereinafter, the present invention will be described more specifically by showing Examples of the present invention, but the present invention is not limited to these Examples.

(Example 1)
Acrylic resin (SUMIPEX EX (refractive index 1.490), manufactured by Sumitomo Chemical Co., Ltd.) was supplied to an extruder having a screw diameter of 65 mm, melted and kneaded at 210 to 260° C., and passed through a multi-block and a T-die. A continuous resin sheet was manufactured by extruding into a sheet shape at a T-die temperature of 260°C. This extruded continuous resin sheet is sandwiched (pressed) by a first pressing roll which is a mirror-cooling roll whose surface is chrome-plated and a second pressing roll which is provided with a transfer mold on the surface. The transfer mold was transferred onto the surface of the continuous resin sheet while being sequentially conveyed by rotation. After that, the continuous resin sheet is conveyed in a state of being in close contact with the second pressing roll, and then sandwiched (pressed) by the second pressing roll and the third pressing roll which is a mirror-finished roll whose surface is chromium-plated. , Was sequentially conveyed by rotation of each pressing roll, and then was taken by a take-up roll to obtain a shaped resin sheet having a convex portion on one surface and a refractive index of 1.490 (thickness L: 200 μm). ..

Convex shape 1st base angle 2a: 7°
Second bottom angle 2b: 90°
Pitch interval (P): 250 μm
Height (H): 31 μm

A pressure-sensitive acrylic pressure-sensitive adhesive (NSS (refractive index 1.470), Shin-Tak Kasei Co., Ltd.) was applied to the surface of the obtained shaped resin sheet having no convex portion with a hand roll and cured. The adhesive layer was formed to have a thickness of 100 μm.

A glass plate (soda lime glass, 100 mm×100 mm×3 mm (thickness), total light transmittance: 90%, refractive index: 1.51) is arranged on the upper side of the adhesive layer to prepare “panel 1” of the present invention. did.

(Example 2)
In the same manner as in Example 1, a shaped resin sheet having a convex portion on one surface and a refractive index of 1.490 was obtained. A pressure-sensitive acrylic pressure-sensitive adhesive (P-3132 (refractive index 1.466), Lintec Co., Ltd.) was applied to the surface of the obtained shape-imparting resin sheet having no convex portion by a hand roll, and after curing. An adhesive layer was formed to have a thickness of 10 μm to prepare “panel 2” of the present invention.

(Comparative Example 1)
In the same manner as in Example 1, a shaped resin sheet having a convex portion on one surface and a refractive index of 1.490 was obtained. The obtained shaped resin sheet is not provided with an adhesive layer, and the shaped resin sheet is made so that the surface having the convex portion is on the outer side, and the peripheral portion of the shaped resin sheet is covered with Sellotape (registered trademark) ( By fixing to a glass plate (soda lime glass, 100 mm×100 mm×3 mm (thickness), total light transmittance: 90%, refractive index: 1.51) with NT-24, Nichiban Co., Ltd., “Comparative Panel 1 Was produced.

In addition, in this comparative panel 1, an air layer exists between the light control member and the glass plate, and the air layer is regarded as corresponding to the adhesive layer in Examples 1 and 2, and the air The refractive index (1.000) of the layer was defined as the refractive index B.

[Dimmer performance evaluation]
Each dimming performance at an incident angle of 30° and 70° was evaluated. Using a pseudo-solar solar simulator, measure the amount of light (transmitted light amount) that passes through the sample at incident angles of 0°, +30°, and +70°, and compare the amount of transmitted light at the incident angle of 30° with the transmitted light amount at the incident angle of 0°. The ratio (light transmittance) and the ratio (light transmittance) of the amount of transmitted light at an incident angle of 70° were calculated (transmitted light amount at an incident angle of 30°/transmitted light amount at an incident angle of 0°, and incident angle of 70°). (Amount of transmitted light at 0/amount of transmitted light at incident angle 0°) The results are shown in Table 1 below.

Here, the amount of transmitted light (%) of each sample is defined as the ratio of the amount of light obtained by measuring with the sample to the amount of light with 100% of the amount of transmitted light obtained by measuring without the sample. It is a value obtained by calculation.

As described above, in Comparative Example 1, since there is no adhesive layer and the difference in refractive index is 0.490, the amount of transmitted light and the light transmittance may be higher than those in Examples 1 and 2 at an incident angle of 70°. all right. This result shows that in Comparative Example 1, the light was not sufficiently suppressed at the incident angle of 70°.

It was also found that when the adhesive layer was not used as in Comparative Example 1, the desired light control effect could not be obtained by simply disposing the light control member on the glass plate due to the air layer existing between them. It was

On the other hand, in Examples 1 and 2 of the present invention, at an incident angle of 70°, the light transmittance was about 1/2 of that in Comparative Example 1, and excellent light control performance (light suppressing effect) was brought about. all right. Further, such an effect can also be caused by the absolute value of the refractive index difference being 0.2 or less.

(Examples 3 to 7)
Acrylic resin (SUMIPEX MH, manufactured by Sumitomo Chemical Co., Ltd.), rubber particles (the innermost layer is composed of a hard polymer polymerized with methyl methacrylate as the main component and further using allyl methacrylate, The layer is composed of butyl acrylate as the main component, and is made of a soft elastic material polymerized with styrene and allyl methacrylate, and the outermost layer is composed of methyl methacrylate as the main component and further polymerized with ethyl acrylate. Rubber particles having an average particle diameter of 240 nm in the intermediate layer, which are elastic particles having a three-layer structure made of the hard polymer thus prepared, were mixed in the proportions shown in Table 2 below.
The obtained resin is supplied to an extruder having a screw diameter of 65 mm, melt-kneaded at 210 to 260° C., and extruded in a sheet form at a T die temperature of 260° C. through a multiblock and a T die to produce a continuous resin sheet. did. The extruded continuous resin sheet is sandwiched (pressed) by a first pressing roll, which is a mirror-cooling roll whose surface is chrome-plated, and a second pressing roll which has a transfer mold on the surface, and each pressing roll is rotated. The transfer mold was transferred onto the surface of the continuous resin sheet while being sequentially conveyed by. After that, the continuous resin sheet is conveyed in a state of being in close contact with the second pressing roll, and then sandwiched (pressed) by the second pressing roll and the third pressing roll which is a mirror-finished roll whose surface is chromium-plated. Then, it was sequentially conveyed by the rotation of each pressing roll, and then taken up by a take-up roll to obtain a shaped resin sheet having a convex portion on one surface and a refractive index of 1.490.

Convex shape 1st base angle 2a: 7°
Second bottom angle 2b: 90°
Pitch interval (P): 250 μm
Height (H): 31 μm

A pressure-sensitive acrylic pressure-sensitive adhesive (NSS (refractive index 1.470), Shin-Tak Kasei Co., Ltd.) was applied to the surface of each of the obtained shaped resin sheets (refractive index 1.490) that does not have a convex portion. It was applied with a hand roll and an adhesive layer was formed so that the thickness after curing was 100 μm.
A glass plate (soda lime glass, 100 mm×100 mm×3 mm (thickness), total light transmittance: 90%, refractive index: 1.51) is arranged on the upper side of the adhesive layer, and “panels 3 to 7” of the present invention are arranged. Was produced.
In each panel, the difference in refractive index between the shaped resin sheet and the adhesive layer was 0.020.

(Comparative example 2)
The shaped resin sheet manufactured in the same manner as the shaped resin sheet manufactured in Examples 3 to 7 (rubber particle compounding amount 0%, thickness 200 μm, refractive index 1.490) and glass plate (soda lime glass, 100 mm×100 mm×) A “comparative panel 2” was prepared in the same manner as in Comparative Example 1 using 3 mm (thickness), total light transmittance: 90%, refractive index: 1.51) without using an adhesive.

In addition, in this comparative panel 2, an air layer exists between the light control member and the glass plate, and the air layer is regarded as corresponding to the adhesive layer in Examples 3 to 7, and such an air layer is considered. The refractive index (1.000) of the layer was defined as the refractive index B.

[Evaluation of crime prevention performance]
As the evaluation of the crime prevention performance, "impact resistance", "pluck resistance" and "break resistance" were evaluated according to the following criteria.

<Evaluation of impact resistance>
With respect to the panel samples (100 mm×100 mm) obtained in Examples 1 to 7 and Comparative Examples 1 and 2 of the present invention, the glass plate was the upper side (falling ball side), the shaping resin sheet was the lower side, and the weight was 35. A metal ball having a diameter of 20 mm and a diameter of 8 g was dropped on the test piece while increasing the height from the surface of the glass plate by 10 cm. Then, the impact resistance was evaluated based on the following evaluation criteria. The results are shown in Table 2 below.

Criteria for evaluating impact resistance A: Even if a metal ball was dropped from a height of 50 cm, the test piece did not crack.
B: Even if the metal ball was dropped from a height of 10 cm, the test piece did not crack, but when the metal ball was dropped from a height of 50 cm, a crack occurred.
C: When a metal ball was dropped from a height of 10 cm, a crack was generated.

In addition, "haze" shown in Table 2 is a state in which two convex-shaped resin sheets are used so that the convex portion and the concave portion are overlapped with each other, and the haze meter HM150 (manufactured by Murakami Color Research Laboratory) is used to measure JIS K. It measured by the method based on 7136.

Further, the “dimming property” shown in Table 2 is that the difference between the transmitted light amount at an incident angle of 30° and the transmitted light amount at an incident angle of 70° is 55% or more according to the above-mentioned dimming performance test. "G" indicates that the dimming property is good and "NG" indicates that the dimming property is less than 55%, which indicates that the dimming property is poor (no good).

As shown in Table 2, it was found that the panels of Comparative Examples 1 and 2 were inferior in impact resistance even when the metal ball was dropped from a height of 10 cm, because the panel cracked. It was also found that the dimming property was not sufficient.
On the other hand, it was found that the panels of Examples 1 to 7 of the present invention had excellent light controllability and excellent impact resistance. It is considered that such an excellent effect can be obtained by compounding the shaped resin sheet with the rubber particles in an amount within a prescribed range. Even when the thickness is about 200 μm, excellent impact resistance is obtained. Can be obtained.

<Evaluation of prying resistance>
The samples of the panels obtained in Examples 1 to 7 of the present invention and Comparative Examples 1 and 2 were placed on a window frame, and the "peal resistance" of the panels was evaluated based on the following evaluation criteria. The results are shown in Table 3 below.

Evaluation criteria for prying resistance G: The time required to "prying" the panel with a driver is 1 minute or more NG: The time required to "prying" the panel with a driver is less than 1 minute is there

<Evaluation of breaking resistance>
Samples of the panels obtained in Examples 1 to 7 of the present invention and Comparative Examples 1 and 2 were placed on a window frame, and the "breaking resistance" of the panels was evaluated based on the following evaluation criteria. The results are shown in Table 3 below.

Evaluation Criteria for Breaking Resistance G(good): Time required for "breaking" the panel with a bar is 5 minutes or more NG(no good): Time required for "breaking" the panel with a bar Less than 5 minutes

As shown in the above table, the panels of Examples 1 to 7 of the present invention have excellent prying resistance and puncture resistance, and have excellent crime prevention performance.
On the other hand, it was found that the panels of Comparative Examples 1 and 2 had no crime prevention performance.

In addition, in the above-mentioned security performance evaluation test, for the panels of Examples 1 to 7 and Comparative Examples 1 and 2, a 170.8 cm x 76.5 cm light control member was used, and a 170.8 cm x 76.5 cm glass plate was used. The sample attached to was used as a sample.

The panel of the present invention has excellent dimming performance and high crime prevention performance, and can be used as a substitute for a conventional window member such as a window glass.

DESCRIPTION OF SYMBOLS 1 Shaped resin sheet 2 Bottom angle 3 Resin input port 4 Die 5 Press roll 6 Transfer type 7 Extruder 8 Air layer 10 Light control member 20 Adhesive layer 30 Plate member 100 Panel

Claims (11)

A light control member including at least one shaping resin sheet having a convex portion on one surface;
An adhesive layer arranged on one surface of the shaped resin sheet,
A transparent plate member arranged on one surface of the shaped resin sheet through the adhesive layer, a panel,
When the refractive index of the shaped resin sheet is A and the refractive index of the adhesive layer is B, the absolute value of the difference between the refractive index A and the refractive index B is 0.020 or more and 0.030 or less. Ri,
A panel in which the shaped resin sheet contains 10% by weight or more and 45% by weight or less of rubber particles based on the total weight of the resin contained in the shaped resin sheet . The panel according to claim 1, wherein the shape-imparting resin sheet has a thickness of 150 μm or more. The thickness of the adhesive layer is 10μm or more 150μm or less, panel according to claim 1 or 2. The embossing with a resin sheet the adhesive layer on the surface having no convex portion of the panel according to any one of claims 1-3. A plurality of protrusions, the height of the convex portion is at 1μm or more 1cm or less, the pitch distance between the adjacent convex portions of the plurality of convex portions is 10μm or more 10cm or less, of claims 1-4 The panel according to any one of items. A substantially triangular cross-sectional shape of the convex portion, the panel according to any one of claims 1-5. The panel according to claim 6 , wherein one base angle of the substantially triangular shape is more than 0° and less than 90°, and the other base angle is 90°. The two shape-imparting resin sheets which have the said convex part are included, the convex parts of the said shape-imparting resin sheet are arrange|positioned facing each other, and an air layer exists between the said shape-imparting resin sheets. The panel according to any one of 1 to 7 . A method comprising: two shaped resin sheets having the convex portions, the convex portions of the shaped resin sheet are arranged so as to face each other, and an adhesive layer exists between the shaped resin sheets. Item 10. The panel according to any one of items 1 to 8 . The panel according to claim 8 or 9 , wherein the convex portions of the two shaping resin sheets are in point-symmetrical relation with each other. The panel according to any one of claims 1 to 8 , which includes only one sheet of the shaped resin sheet.

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