JP2015140583A - Lighting control member with adhesive layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting control member that can impart lighting control performance to a windowpane without replacement of the windowpane.SOLUTION: A lighting control member with an adhesive layer comprises a lighting control member that includes at least one shaping resin sheet having a protrusion on one surface, and the adhesive layer that is placed on one surface of the shaping resin sheet. When A represents a refractive index of the shaping resin sheet and B represents a refractive index of the adhesive layer, the absolute value of a difference between the refractive index A and the refractive index B is 0.2 or less.

Description

  The present invention relates to a light control member with an adhesive layer.

  For example, in Japan, Patent Document 1 discloses a window member having a light control performance that suppresses the incidence of summer sunlight into a room and allows it to be permitted without inhibiting the incidence of winter sunlight into the room. Then, it is disclosed that a light control member formed by arranging a pair of shaping resin sheets having a convex portion on one surface with the convex portion facing each other with an air layer interposed therebetween is used instead of the window glass. Has been.

  The light control member disclosed in Patent Document 1 is assumed to be used in place of the window glass, and replacement with the window glass is required for its use.

JP 2011-94471 A

  The objective of this invention is providing the light control member which can provide the light control performance to this window glass, without replacing a window glass.

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

(1)
A dimming member with an adhesive layer comprising a dimming member comprising at least one shaping resin sheet having a convex portion on one surface, and an adhesion layer disposed on one surface of the shaping resin sheet. Yes, 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 0.2 or less. Light control member with layer.
(2)
The light control member with the adhesion layer as described in said (1) which has the said adhesion layer in the surface which does not have the convex part of the said shaping resin sheet.
(3)
The light control member with an adhesive layer according to (1) or (2), wherein the thickness of the adhesive layer is 1 μm or more and 500 μm or less.
(4)
(1) to (3) having a plurality of protrusions, wherein the height of the protrusions is 1 μm or more and 1 cm or less, and the pitch interval between adjacent protrusions of the plurality of protrusions is 10 μm or more and 10 cm or less. The light control member with the adhesion layer of any one of 1).
(5)
The light control member with the adhesion layer of any one of said (1)-(4) whose cross-sectional shape of the said convex part is a substantially triangle.
(6)
The light control member with an adhesive layer according to (5), wherein one base angle of the substantially triangular shape is greater than 0 ° and less than 90 °, and the other base angle is 90 °.
(7)
Including two molding resin sheets having the convex portions, the convex portions of the molding resin sheet are arranged to face each other so as to correspond to each other, and an air layer exists between the molding resin sheets, The light control member with the adhesion layer of any one of 1)-(6).
(8)
Including two molding resin sheets having the convex portions, the convex portions of the molding resin sheet are arranged to face each other so as to correspond to each other, and an adhesive layer exists between the molding resin sheets, The light control member with an adhesion layer of any one of (1)-(6).
(9)
The light control member with an adhesive layer according to (7) or (8), wherein the convex portions of the two shaped resin sheets have a point-symmetric relationship with each other.
(10)
The light control member with the adhesion layer of any one of said (1)-(6) containing only one said shaping | molding resin sheet.
(11)
The light control member with the adhesion layer of any one of said (1)-(10) which further contains the frame member arrange | positioned at the outer peripheral part of the said light control member.
(12)
The light control member with the adhesion layer of any one of said (1)-(11) used as a member for windows.
(13)
The shaping resin sheet used with the adhesion layer in the light control member with an adhesion layer of any one of said (1)-(12).
(14)
The scattering prevention sheet which consists of a light control member with the adhesion layer of any one of said (1)-(12).

  According to the light control member with the pressure-sensitive adhesive layer of the present invention, it is possible to suppress the incidence of, for example, summer sunlight into the room and / or winter by simply pasting (or pasting) the window glass. The light control performance which can be accept | permitted without suppressing the incidence | injection of the sunlight in the room | chamber interior can be provided.

It is a schematic diagram of the light control member used by one Embodiment of this 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 resin sheet used by this invention. It is explanatory drawing of a critical angle and total reflection.

  Light control member with an adhesive layer of the present invention (hereinafter referred to as “light control article”, “light control product”, “light control device”, “light control device”, “light control sheet”, “light control film”, “light control film”, Is sometimes referred to as an “optical panel” or the like), which comprises at least a light-modulating member including at least one shaping resin sheet having a convex portion on one surface, and further comprising such a shaping resin sheet. When one surface (preferably the surface not having a convex portion) has an adhesive layer, and the refractive index of the shaped resin sheet is A and the refractive index of the adhesive layer is B, this refractive index A and The absolute value of the difference from the refractive index B (hereinafter sometimes referred to as “refractive index difference absolute value”) is 0.2 or less. In the present invention, the absolute value of the refractive index difference may be an absolute value of refractive index A-refractive index B or an absolute value of refractive index B-refractive index A.

  The dimming member with an adhesive layer of the present invention itself is, for example, in Japan, suppressing the incidence of summer sunlight into the room and / or without inhibiting the incidence of winter sunlight into the room. This light control member with an adhesive layer has an acceptable light control performance, and is adhered (or bonded) to the window glass so that the surface of the adhesive layer is in contact with the window glass. The window glass attached with can also provide dimming performance that can be tolerated without suppressing the incidence of summer sunlight into the room and / or without inhibiting the incidence of winter sunlight into the room. it can. When the adhesive layer of the light control member with the adhesive layer is attached to the window glass so as to be in contact with the window glass, there is an adhesive layer between the light control member and the window glass included in the light control member with the adhesive layer. It is preferable.

  Therefore, the light control member with an adhesive layer of the present invention has the above refractive index difference absolute value of 0.2 or less, preferably 0.15 or less, more preferably 0.1 or less, and further preferably 0.03 or less. By this, the outstanding light control performance can be provided to a window glass. When this refractive index difference absolute value is too large, for example, when the light control member with the adhesive layer of the present invention is attached to the indoor side of the window glass, at the interface between the adhesive layer and the light control member, Light that travels from the adhesive layer to the light control member is reflected or refracted by the light control member, making it impossible to sufficiently suppress the incidence of summer sunlight into the room. Incident light is suppressed. In order to set the absolute value of the refractive index difference within the predetermined range, the refractive indexes of the shaping resin sheet and the adhesive layer described later may be appropriately adjusted.

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

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

  Regarding the adjustment of the refractive index of the shaping resin sheet and the adhesive layer, it is possible to make the refractive index low by adding silica particles or fluororesin which are low refractive index components, or metal which is a high refractive index component. A high refractive index can be obtained by adding fine particles or minerals.

<Shaping resin sheet>
The shaped resin sheet (or shaped resin sheet) included in the light control member included in the light control member with an adhesive layer of the present invention is a resin sheet having a convex portion on one surface, for example, melting resin It can also be obtained by extrusion molding, cutting, press molding, injection molding or cast polymerization. The shaping resin sheet has a plurality of convex portions preferably formed continuously on one surface. The surface that does not have such a convex portion (that is, the surface opposite to the surface having the convex portion) is usually a flat surface, but may be a mat surface as long as the effects of the present invention are not impaired. . The schematic diagram of the cross-sectional shape of the shaping resin sheet which concerns on one Embodiment of this invention is shown in FIG.

  As the resin, a resin that can be melt-extruded is preferable, and usually, a thermoplastic resin that becomes a molten state when heated is used. 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, and polycarbonate (PC) resin. Of these, acrylic resins are preferred because of their excellent transparency and weather resistance. In addition, in this invention, there is no restriction | limiting in particular in resin contained in a shaping resin sheet.

  The acrylic resin is not particularly limited. For example, a homopolymer of acrylic monomers such as (meth) acrylic acid, (meth) acrylic acid ester, (meth) acrylonitrile, or two or more kinds of copolymers, such an acrylic resin. Examples thereof include a copolymer of a system monomer and another monomer. In the present specification, the term “(meth) acryl” means “acryl” or “methacryl”.

  As the acrylic resin, it is preferable to use a methacrylic resin from the viewpoint of having excellent hardness, weather resistance, transparency and the like. A 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 polyalkyl methacrylate), 50% by weight or more of a methacrylic acid ester and Examples thereof include a copolymer with a monomer other than methacrylic acid ester of 50% by weight or less. When the methacrylic resin is a copolymer, the methacrylic acid ester is preferably 70% by weight or more and the other monomer is 30% by weight or less, more preferably 90% by weight, based on the total amount of monomers. % And other monomers are 10% by weight or less.

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

  Examples of monomers other than methacrylic acid esters include acrylic acid esters, unsaturated nitriles, ethylenically unsaturated carboxylic acid hydroxyalkyl esters, ethylenically unsaturated carboxylic acid amides, ethylenically unsaturated acids, and ethylenically unsaturated sulfones. Examples 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 esters are preferable. Monomers other than methacrylic acid esters may be used alone or in combination of two or more.

  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, Acrylics such as n-octyl acrylate, n-nonyl acrylate, isononyl acrylate, decyl acrylate, undecyl acrylate, n-amyl acrylate, isoamyl acrylate, lauryl acrylate, methoxyethyl acrylate and ethoxyethyl acrylate Examples include acid alkyl. Among these, an acrylate ester having an alkyl group having 1 to 8 carbon atoms is preferable, and methyl acrylate is more preferable.

  Examples of the unsaturated nitrile include acrylonitrile, α-chloroacrylonitrile, α-methoxyacrylonitrile, methacrylonitrile, vinylidene cyanide and the like.

  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 -Methoxymethylmethacrylamide, Nn-propoxymethylacrylamide, Nn-propoxymethylmethacrylamide, N-methylacrylamide, N-methylmethacrylamide, N, N-dimethylacrylamide, N, N-dimethylmethacrylamide N, N-diethylacrylamide, N, N-diethylmethacrylamide and the like.

  Examples of the ethylenically unsaturated acid include an ethylenically unsaturated carboxylic acid such as acrylic acid, methacrylic acid, itaconic acid, fumaric acid, fumaric anhydride, maleic acid, maleic anhydride, vinyl sulfonic acid, isoprene sulfonic acid, or And ethylenically unsaturated sulfonic acid. The ethylenically unsaturated acid monomer may be neutralized with, for example, an alkali metal such as sodium or potassium, ammonia or the like.

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

  Examples of ethylenically unsaturated alcohols and esters thereof include allyl alcohol, methallyl alcohol, vinyl acetate, vinyl propionate, vinyl butyrate, vinyl stearate, vinyl benzoate, allyl acetate, methallyl caproate, allyl laurate, and benzoate. Examples 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, and ethyl allyl ether.

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

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

  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, and 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, homopolymer of methyl methacrylate (polymethyl methacrylate), 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 (meth) acrylic acid ester other than methyl methacrylate includes methyl methacrylate and Methyl methacrylate is contained in a proportion of 50% by weight or more and 99.9% by weight or less with respect to the total amount with (meth) acrylic acid ester, and 0.1% by weight of (meth) acrylic acid ester other than methyl methacrylate. It is a copolymer obtained by polymerizing a monomer mixture contained in a proportion of not less than 50% and not more than 50% by weight. In this monomer mixture, methyl methacrylate is preferably contained in a proportion of 70 wt% or more and 99.9 wt% or less, more preferably 90 wt% or more and 99.9 wt% or less.

  The acrylic resin can be obtained by polymerizing the above-described monomer by a polymerization method such as an emulsion polymerization method, a suspension polymerization method, a bulk polymerization method, or a liquid injection polymerization method (cast polymerization method). Polymerization is performed, for example, using light irradiation or a polymerization initiator, and an azo initiator (for example, 2,2′-azobisisobutyronitrile, 2,2′-azobis (2,4-dimethylvaleronitrile) is used. )), Peroxide initiators (lauroyl peroxide, benzoyl peroxide, etc.), and polymerization initiators such as redox initiators in which organic peroxides and amines are combined are preferably used. The polymerization initiator is usually used in a proportion of 0.01 parts by weight or more and 1 part by weight or less, preferably 0.01 parts by weight or more and 0.5 parts by weight or less with respect to 100 parts by weight of the monomer constituting the acrylic resin. It is done. Further, a chain transfer agent for controlling the molecular weight (a linear or branched alkyl mercaptan compound such as methyl mercaptan, n-butyl mercaptan, t-butyl mercaptan, etc.), a crosslinking agent or the like may be added.

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

  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 additives include stabilizers, antioxidants, ultraviolet absorbers, light stabilizers, colorants, foaming agents, lubricants, mold release agents, antistatic agents, flame retardants, polymerization inhibitors, flame retardant aids, Examples include 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 wt% or more and 30 wt% or less with respect to the resin.

  Rubber particles may be added to the acrylic resin. Here, as the rubber particles, for example, acrylic rubber particles, butadiene rubber particles, styrene-butadiene rubber particles and the like can be used. Among these, acrylic rubber particles are used from the viewpoint of weather resistance and durability. Preferably used.

  For example, acrylic rubber particles are particles containing an elastic polymer mainly composed of an acrylate ester as a rubber component, and may be particles having a single layer structure made of only this elastic polymer. For example, in the case of a molded resin sheet made of an acrylic resin, its surface hardness may be a multi-layered particle having a coalesced layer and a polymer layer mainly composed of a methacrylic ester, for example. In view of the above, it is preferable that the particles have a multilayer structure.

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

  A preferable monomer composition of the elastic polymer mainly composed of an acrylate ester is 50% by weight or more and 99.9% by weight or less of alkyl acrylate, and 0% by weight or more of alkyl methacrylate based on all monomers. 0.9 wt% or less, monofunctional monomers other than these being 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 100% by weight).

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

  The alkyl methacrylate in the elastic polymer is, for example, the same as the examples of alkyl methacrylates previously mentioned as the monomer component of the methacrylic resin, and the alkyl group usually has 1 to 8 carbon atoms, preferably Is 1-4.

  Examples of monofunctional monomers other than alkyl acrylate and alkyl methacrylate in the elastic polymer include, for example, styrene monomers such as styrene, α-methylstyrene, vinyltoluene, and cyanation such as acrylonitrile and methacrylonitrile. Examples include alkenyl; (meth) acrylic acid; maleic anhydride; N-substituted maleimide and other compounds having a polymerizable carbon-carbon double bond (monofunctional monomer) in the molecule, among which styrene, 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, 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 Examples thereof include compounds having at least two polymerizable carbon-carbon double bonds in the molecule (polyfunctional monomers), and among them, alkenyl esters of unsaturated carboxylic acids and alkenyl esters of polybasic acids are preferably used.

  The alkyl acrylate, the alkyl methacrylate, the monofunctional monomer other than these, and the polyfunctional monomer in the elastic polymer may each be used in combination of two or more as necessary.

  When the acrylic rubber particles having a multilayer structure are used, a preferred example thereof is a polymer layer mainly composed of methacrylic acid ester outside the above-mentioned elastic polymer layer mainly composed of acrylate ester. That is, the above-mentioned elastic polymer mainly composed of an acrylic ester is used as an inner layer, and the polymer mainly composed of a methacrylic ester is used as an outer layer. Here, as the methacrylic acid ester which is a monomer component of the polymer of the outer layer, the above-mentioned alkyl methacrylate is usually used.

  The outer layer polymer is usually formed in a proportion of 10 to 400 parts by weight, preferably 20 to 200 parts by weight, based on 100 parts by weight of the inner elastic polymer. By setting the polymer of the outer layer to 10 parts by weight or more with respect to 100 parts by weight of the elastic polymer of the inner layer, the elastic polymer hardly aggregates and the transparency of the molded resin sheet made of an acrylic resin is good. It becomes.

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

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

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

  Examples of the 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, The same as the examples of the polyfunctional monomer mentioned above.

  In addition, as for the alkyl methacrylate, the alkyl acrylate, the monomer other than these, and the polyfunctional monomer in the polymer of the outer layer, two or more kinds thereof may be used as necessary.

  Further, as a suitable example of the acrylic rubber particles having a multilayer structure, an inner layer of the above-mentioned acrylic ester mainly composed of the above-mentioned acrylic ester which is the inner layer of the above-mentioned two-layer structure, and a layer mainly composed of methacrylic ester. A polymer having a combined layer, that is, a polymer mainly composed of this methacrylic acid ester is used as the innermost layer, and the above-mentioned elastic polymer mainly composed of acrylic acid ester is used as the intermediate layer, and the above methacrylic acid ester is mainly used. Mention may also be made of at least a three-layer structure with the polymer as the outermost layer. Here, as the methacrylic acid ester which is the monomer component of the innermost polymer, the above-mentioned alkyl methacrylate is usually used. The innermost layer polymer is usually formed in a proportion of 10 to 400 parts by weight, preferably 20 to 200 parts by weight, based on 100 parts by weight of the elastic polymer in the intermediate layer.

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

  The alkyl methacrylate in the innermost layer polymer is, for example, the same as the examples of alkyl methacrylate previously mentioned as the monomer component of the methacrylic resin, and the alkyl group usually has 1 to 8 carbon atoms, preferably Is 1-4. Of these, methyl methacrylate is preferably used.

  In addition, the alkyl acrylate in the innermost layer polymer is the same as the alkyl acrylate examples mentioned above as the monomer component of the methacrylic resin, and the alkyl group usually has 1 to 8 carbon atoms. , Preferably 1 to 4.

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

  In addition, as for the alkyl methacrylate, the alkyl acrylate, the monofunctional monomer and the polyfunctional monomer other than these in the innermost layer polymer, two or more kinds thereof may be used as necessary. .

  The acrylic rubber particles can be prepared by polymerizing the monomer component of the elastic polymer mainly composed of the above-described acrylic ester by at least one reaction by an emulsion polymerization method or the like. At this time, as described above, when a polymer layer mainly composed of methacrylic acid ester is formed outside the elastic polymer layer, the monomer component of the outer layer polymer is added to the elastic polymer layer. What is necessary is just to graft to the said elastic polymer by making it superpose | polymerize by reaction of at least 1 step | paragraph by emulsion polymerization method etc. in presence of a polymer.

  As described above, when a polymer layer mainly composed of methacrylic acid ester is formed inside the elastic polymer layer, the monomer component of the innermost layer polymer is first added. In the presence of the resulting polymer, the monomer component of the elastic polymer is then reacted in at least one step by emulsion polymerization or the like. In the presence of the resulting elastic polymer, the polymer component of the outermost layer is grafted to at least one step by emulsion polymerization or the like. What is necessary is just to graft to the said elastic polymer by making it superpose | polymerize by reaction. In the case where the polymerization of each layer is performed in two or more stages, it is sufficient that the monomer composition as a whole is within the above-mentioned predetermined range, not the monomer composition of each stage.

  Regarding the particle diameter of the acrylic rubber particles, the average particle diameter of the elastic polymer layer mainly composed of acrylic acid ester in the rubber particles is preferably 0.01 μm or more and 0.4 μm or less, and 0.05 μm. The thickness is more preferably 0.3 μm or less and further preferably 0.07 μm or more and 0.25 μm or less. If the average particle size of the elastic polymer layer is larger than 0.4 μm, the transparency of the resin sheet made of an acrylic resin is lowered and the transmittance is lowered, which is not preferable. Further, if the average particle size of the elastic polymer layer is smaller than 0.01 μm, it is not preferable because the surface hardness of the resin sheet is lowered and the surface is easily damaged.

  In addition, the average particle diameter is a portion obtained by mixing acrylic rubber particles with a methacrylic resin to form a film, dyeing the elastic polymer layer with ruthenium oxide in the cross section, and observing with an electron microscope. It can be calculated from the diameter.

  That is, when acrylic rubber particles are mixed with methacrylic resin and the cross section thereof is dyed with ruthenium oxide, the methacrylic resin of the parent phase is not dyed. For example, methacrylic ester is mainly present outside the elastic polymer layer. In this case, the outer layer polymer is not dyed, and only the elastic polymer layer is dyed. Thus, the dyed polymer is observed in a substantially circular shape with an electron microscope. The particle diameter can be determined from the diameter of the portion. Further, when a polymer layer mainly composed of methacrylic acid ester is present inside the elastic polymer layer, the polymer of the inner layer is not dyed, and the outer elastic polymer layer is dyed. In this case, the outer diameter, that is, the outer diameter of the elastic polymer layer may be considered.

  The content ratio of the rubber particles with respect to the acrylic resin is usually 40% by weight or less, preferably 30% by weight or less, based on the entire acrylic resin. When the content ratio of the rubber particles is larger than 40% by weight of the whole acrylic resin, the surface hardness of the shaped resin sheet is lowered and easily damaged.

(Convex part of shaped resin sheet)
The convex part formed on one surface of the shaping resin sheet is allowed, for example, in Japan to suppress the incidence of summer sunlight in the room and / or without inhibiting the incidence of winter sunlight in the room. From the viewpoint of providing the dimming performance that can be achieved, the cross-sectional shape is preferably substantially triangular.

  In particular, the convex portion formed on the shaping resin sheet crosses the opposite sides in the longitudinal direction of the shaping resin sheet (or the flow direction of production of the shaping resin sheet) in the width direction (that is, perpendicularly intersects the longitudinal direction). It is a portion of a ridge that extends linearly in the direction), and a cross-sectional shape when cut along the longitudinal direction thereof is preferably substantially triangular.

  In the present invention, “substantially triangular” means that each corner of the triangle may be a sharp end or an acute angle, or may be an arc shape having a certain degree of curvature. It doesn't mean.

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

  When the dimming member with an adhesive layer of the present invention is used as an upright window member described in detail below, that is, when used in a vertical posture, for example, attached to a window glass or the like, this convex portion (more Specifically, it is preferable that the protrusion having a substantially triangular cross section extends in the width direction (left-right direction) orthogonal to the longitudinal direction (up-down direction).

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

  Moreover, in this invention, you may have a plane area | region in the trough part between a convex part, Preferably it is parallel to a convex part (more specifically, the cross-section is a substantially triangular protrusion). It is also possible to have a strip-shaped planar region arranged in the width direction.

  In the convex portion having a substantially triangular cross section, dimming performance capable of suppressing the incidence of summer sunlight into the room and / or allowing the incidence of sunlight without inhibiting the incidence of winter sunlight in the room. In view of the above, the two base angles 2 formed at the base of the triangle (that is, a straight line connecting both ends of the bottom of the triangle) may be referred to as one base angle 2a (hereinafter referred to as “first base angle 2a”). ) Is more than 0 ° and less than 90 °, and the other base angle 2b (hereinafter also referred to as “second base angle 2b”) is preferably more than 0 ° and 90 ° or less. More preferably, the angle 2a is 1 ° to 40 ° and the second base angle 2b is 30 ° to 90 °.

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

  In addition, in such a light control member, streaks may be visually recognized (for example, when viewed from the surface opposite to the surface having the convex portion). From the viewpoint of suppressing the visibility of the streaks, The dibasic angle 2b is particularly preferably 90 °.

  As shown in FIG. 1, the height (H) of the protrusions is independently 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 mold the convex portion on the surface of the resin sheet during the production of the molded resin sheet. If the thickness becomes too thick and the weight itself becomes heavy, the light control member with the adhesive layer of the present invention may be inappropriate when it is applied to, for example, a window glass.

  The pitch interval (P), which is the distance between the apexes of adjacent convex portions (or the distance between the valleys), is preferably 10 μm or more and 10 cm or less, and more preferably 50 μm or more and 10 cm or less. preferable. When the pitch interval (P) is less than 10 μm, it may be difficult to mold the convex portions on the surface of the resin sheet during the production of the molded resin sheet. As shown in FIG. In the shaping resin sheet set to an angle, 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 becomes too thick. When the light control member with the adhesive layer is used by being attached to, for example, a window glass, it may become inappropriate.

  By forming the height (H) and the pitch interval (P) within the predetermined ranges at the convex portions, the convex portions can be easily formed on the molded resin sheet, and the molded resin sheet can be easily manufactured. It is possible to suppress the thickness of the light control member from becoming too thick. Since the light control member comprising at least one, preferably two, of the molded resin sheets is easy to manufacture the molded resin sheet as a constituent member, and the thickness thereof is suppressed, it is necessary. The light control member with an adhesive layer of the present invention having an adhesive layer on one surface of the light control member suppresses the incidence of summer sunlight into the room and / or the winter sunlight into the room. In addition to the dimming performance that can be allowed without suppressing the incidence, it can be easily used as a window member or the like described in detail below.

  The thickness of the shaping resin sheet is preferably 1 μm or more and 10 cm or less, and more preferably 10 μm or more and 1 cm or less. If it is thinner than 1 μm, it may break, and if it is thicker than 10 cm, it itself becomes heavy and may become inappropriate when the light control member with an adhesive layer of the present invention is used by being attached to, for example, a window glass. .

  In the present invention, the thickness of the shaping resin sheet means the distance from the surface of the shaping resin sheet that does not have the convex portion (the surface opposite to the surface having the convex portion) to the bottom of the convex portion. For example, in FIGS. 1 and 2, the distance is indicated by L.

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

<Method for producing shaped resin sheet>
The method for producing the 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 using the above-described resin as a raw material resin. Examples 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, a melt extrusion molding method, a press molding method, an injection molding method, and a cast polymerization method are preferable, and a melt extrusion molding method and a press molding method are more preferable.

(Melt extrusion method)
The method for producing a shaped resin sheet by a melt extrusion molding method includes, for example, a step of extruding a raw material resin in a heated and melted state from a die and extruding it into a sheet shape, and the sheet-like material as a first pressing roll. A first pressing step sandwiched between the second pressing roll, a conveying step for conveying the sheet-like material in close contact with the second pressing roll, and a second pressing roll and the second pressing roll. A second pressing step (molding step) sandwiched between three pressing rolls (molding roll). According to this manufacturing method, a convex portion is formed on one surface of the resin sheet in the process of forming the shaping resin sheet, and therefore a separate secondary for forming the convex portion on one surface of the resin sheet. A processing step is unnecessary, and a shaped resin sheet can be obtained simply and continuously.

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

(Injection molding method)
The method for producing a molded resin sheet by an injection molding method is, for example, a raw material resin that is heated and melted using an injection molding machine comprising a mold clamping unit and an injection unit and a mold that is molded into the shape of the desired molded resin sheet. Is injected into the mold, cooled and solidified. Thereby, a shaping resin sheet is obtained as an injection-molded body.

(Cast polymerization method)
Examples of the method for producing a shaped resin sheet by a cast polymerization method include a cell casting method in which a polymer (raw material resin monomer) is injected into a cell for polymerization, a continuous casting method using a pair of endless belts arranged opposite to each other, and the like. Is mentioned. 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 interval between the cells is appropriately adjusted so that a molded resin sheet having a desired thickness can be obtained. Can be done. Examples of the method for producing the shaped resin sheet include suspension polymerization, emulsion polymerization, and dispersion polymerization in addition to bulk polymerization such as cast polymerization. Among these, bulk polymerization such as cast polymerization is preferable from the viewpoint of obtaining a good appearance and, for example, from the viewpoint of productivity of a large-sized plate.

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

<Manufacturing device for shaped resin sheet>
The production apparatus used in the method for producing a shaped resin sheet includes, for example, a die that continuously extrudes a resin in a heated and melted state to obtain a sheet-like material, a plurality of pressing rolls, and the above-mentioned sheet-like material is supplied to the pressing roll. And a shaping roll that forms a convex portion on the surface of the sheet-like material by being sandwiched between them. FIG. 3 is a schematic diagram of a production apparatus used in the method for producing a shaped resin sheet according to an embodiment of the present invention. The apparatus shown in FIG. 3 includes a die 4 that continuously extrudes a heated and melted resin to obtain a sheet-like material, and a pressing roll 5. The pressing roll 5 includes a first pressing roll 5a for pressing a sheet-like material, a second pressing roll 5b, and a third pressing roll 5c, and includes a transfer die 6 on the surface of the third pressing roll 5c. By sandwiching the sheet-like material between the second pressing roll 5b and the third pressing roll 5c provided with the transfer mold 6, it is possible to obtain the shaped resin sheet 1 molded with a desired surface shape.

  In addition to the pressing roll 5, any roll that is technically irrelevant to the present invention may be provided. Such a roll is in contact with the sheet-like material. For example, a guide roll (touch roll) for conveying 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.

  The method for producing a shaped resin sheet according to the present invention includes, for example, an extruding step of a sheet-like material that is continuously extruded from a die in a heated and melted state and extruded into a sheet shape, and the sheet-like material is a first pressing roll and a second one. A pressing step sandwiched between the pressing rolls, a transporting step of transporting the sheet-like material while being in close contact with the second pressing roll, and the transported sheet-like material between the second pressing roll and the shaping roll And a molding step of sandwiching between. According to this manufacturing method, since a convex shape is imparted to the surface of the resin sheet in the process of molding the resin sheet, a separate secondary processing step for imparting the convex shape to the resin sheet surface is unnecessary, and simple A molded resin sheet is obtained.

(Sheet extrusion process)
In the extruding step of the sheet-like material, the resin is continuously extruded from the die in a heated and melted state to produce a sheet-like material.

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

  For example, an additive such as an ultraviolet absorber, a heat stabilizer, an antistatic agent, or a light diffusing agent may be added to the resin.

  As a die for continuously extruding the resin in a heated and melted state, a metal T die similar to that used in a normal extrusion molding method is used. In order to extrude the resin from the die in a heated and melted state, an extruder is used in the same manner as in a normal extrusion molding method. The extruder may be a single screw extruder or a twin screw extruder. The resin is heated in an extruder, sent to a die in a molten state, and extruded. The resin extruded from the die can be continuously extruded into a sheet.

  The sheet-like material may be a single layer or a multilayer of two or more layers. When the sheet-like material is a single layer, when the resin is extruded from the die in a heated and melted state, one type of resin may be supplied to the die and extruded, and in the case of two or more layers, two or more types The resin may be supplied to the die and coextruded in a laminated state. In the case of co-extrusion in a state where two or more kinds of resins are laminated, for example, a known two-type three-layer distribution type feed block may be used, and the resin may be supplied to the die via this.

(First pressing step)
The sheet-like material obtained in the extrusion process of the sheet-like material can be sandwiched simultaneously between the first pressing roll 5a and the second pressing roll 5b, for example, as shown in FIG. 3 by the first pressing process. . As the first pressing roll and the second pressing roll, a metal roll usually made of a metal such as stainless steel or steel is used, and the diameter is usually 100 mm or more and 500 mm or less. When metal rolls are used as the first and second pressing rolls, the surface thereof may be subjected to plating treatment such as chrome plating, copper plating, nickel plating, nickel-phosphorus plating, or the like. Further, the surface of the pressing roll may be a mirror surface, or may be a transfer surface provided with unevenness such as embossing if it is not necessary to transfer accurately.

(Conveying process)
A conveyance process is a process of conveying according to rotation of the 2nd press roll in the state where the sheet-like object was stuck to the 2nd press roll.

  In the first pressing step and the conveying step, the sheet-like material has a temperature lower than that of the heated and melted state extruded from the die due to cooling due to contact with the pressing roll and cooling due to contact with outside air. Thus, in a state where the temperature is lower than that in the heat-melted state, the sheet-like material is conveyed and used for the next second pressing step (or molding 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-like material can be sandwiched and pressed between the second pressing roll 5b and the third pressing roll 5c as shown in FIG. In this second pressing step, the sheet-like material can be molded by the transfer mold 6 provided on the surface of the third pressing roll 5c. In the present invention, the third pressing roll provided with a transfer mold is also referred to as a shaping roll. The transfer mold provided on the surface of the shaping roll is pressed against the surface of the sheet-like material, and the convex shape is formed on the sheet-like material with the surface shape as the reverse mold.

  In the second pressing step, the sheet-like material is pressed again between the second pressing roll and the shaping roll, peeled off from the second pressing roll, and in close contact with the shaping roll. Can be conveyed according to rotation. At that time, when the surface temperature of the sheet-like material is high and the sheet-like material is sufficiently in close contact with the shaping roll without being pressed between the second pressing roll and the shaping roll, the second pressing roll and the shaping roll are applied. The space between the mold rolls may be slightly larger than the thickness of the sheet-like material. The sheet-like material conveyed according to the rotation of the shaping roll is peeled off from the shaping roll to obtain a shaped resin sheet.

  The transfer mold 6 is composed of a plurality of concave portions provided on the surface of the shaping roll, and the shape of the concave portion is preferably a reverse type of the cross-sectional shape of the convex portion on the surface of the resulting molding resin sheet. When the cross-sectional shape of this is, for example, a triangle, a V-shaped groove corresponding to the shape of this triangle is preferable.

  When the distance between the apexes of the adjacent concave portions of the shaping roll is the pitch interval (P) and the distance from the circumference of the shaping roll surface to the apex of the concave portion is the groove depth (H), the pitch interval (P) And the groove depth (H) may be set corresponding to the height (H) and pitch interval (P) of the protrusions 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 a method for producing the transfer mold, the surface of the shaping roll made of stainless steel, steel, or the like is subjected to plating treatment such as chrome plating, copper plating, nickel plating, nickel-phosphorous plating, and then the plating surface is applied. On the other hand, the shape may be processed by performing removal processing using a diamond tool, a metal grindstone, or the like, laser processing, or chemical etching, but it is not particularly limited to these methods.

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

  By shaping the surface shape (transfer mold) of the shaping roll into a sheet-like material in the second pressing step, the intended shaping resin sheet can be produced. The obtained shaped resin sheet is usually further cooled, then cut into single sheets, and can be used as a light control member.

  In the production method of the present invention, the first pressing roll is used as the shaping roll, not the third pressing roll, and the sheet-like material extruded from the die is sandwiched between the shaping roll and the second pressing roll. Alternatively, the second 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 first pressing roll for shaping.

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

  Here, as an example, a schematic diagram of a light control member in which only one shaping resin sheet is arranged is shown in FIG. 1, and a schematic diagram of a light adjustment member in which two shaping resin sheets are arranged is shown. It is shown in 2.

  In the light control member, for example, when two shaped resin sheets are used, the light control member is disposed so as to face each other so that the convex portions of the two shaped resin sheets correspond to each other. It is preferable that an air layer exists between the shaping resin sheets (see FIG. 2).

  In the light control member 8 shown in FIG. 2, the air layer 9 is a gap between the molding surfaces (that is, the surfaces having the convex portions) of the pair of molding resin sheets 1 </ b> A and 1 </ b> B having the convex portions corresponding to each other. For example, as shown in the drawing, a right-sloping slope 9a and a horizontal plane 9b are repeatedly arranged. In addition, in this embodiment, although a pair of shaping resin sheet 1A and 1B is arrange | positioned through the air layer 9, the light control member in this invention is not limited to this, A pair of shaping resin sheet 1A And 1B may be partially or entirely bonded with an adhesive. That is, in the light control member with an adhesive layer of the present invention, the air layer may be filled with an adhesive, or an adhesive layer may be formed between the shaping resin sheets. In the case where such a pair of shaping resin sheets is bonded with an adhesive, the filling of the adhesive can be performed on the entire surface having the convex portion as long as the two shaping resin sheets can be fixed. It may be a peripheral part or a part thereof.

  In addition, as an adhesive agent which can be used in this invention, there will be no restriction | limiting in particular if it can join shaping resin sheets and can permeate | transmit light. Moreover, in this invention, you may use the adhesive which can form the adhesion layer demonstrated in detail below as this adhesive agent. Therefore, in the present invention, the “adhesive layer” is not limited to those having only adhesiveness that can be composed of an adhesive, but also includes layers that can be formed from an adhesive. And / or as sticky.

  When the pair of molding resin sheets are arranged so that the molding surfaces face each other, preferably with the projections facing each other, the opposing projections are preferably in a point-symmetric 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-symmetric relationship with the midpoint of the hypotenuse of the triangle as the center of symmetry. Thereby, an air layer can hold | maintain a fixed space | interval. When arranging a pair of shaping resin sheets so that the convex portions facing each other have a point-symmetrical relationship, that is, the pair of shaping resin sheets, the convex portion of one shaping resin sheet and the other shaping resin When arranging so that the valley of the sheet (that is, the concave portion corresponding to the convex portion) is superimposed, a part or all of the pair of molded resin sheets is bonded with the above-described adhesive or the like. May be.

  For example, in the embodiment shown in FIG. 2, the light control member 8 formed by arranging the pair of shaping resin sheets 1 </ b> A and 1 </ b> B to face each other with the convex portions corresponding to each other has a flat surface 8 </ b> X on one surface, It is preferable that the other surface has a plane 8Y, and the plane 8X and the plane 8Y are parallel to each other.

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

  In the illustrated embodiment, the dimming member 8 has a right-down slope 9a inclined at an angle 2a with respect to the plane 8X and a left-down slope 9b inclined at an angle 2b with respect to the planes 8X and 8Y (depending on the angle 2b, It has an air layer 9 having a certain thickness. The inclination angle 2a of the air layer 9 (that is, the first base angle 2a of the triangular section of the convex portion of the shaping resin sheet) can be set in consideration of technical matters described in detail below.

  Here, the case where the resin of the shaping resin sheets 1A and 1B constituting the light control member 8 is a resin having a refractive index of 1.5 will be described as an example.

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. In this example, since the refractive index of the resin is 1.5 and the refractive index of air is 1.0, the refraction angle is larger than the incident angle. As the incident angle increases, the refraction angle also increases. When the incident angle reaches a certain angle, as shown in the center of FIG. 4, the refraction angle becomes 90 °, and light does not advance from the resin to the air side. In addition, 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. 4, the light is totally reflected at the interface between the resin and air, and is in 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 index of air and the refractive index of resin.

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

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

  Here, for example, as shown in FIG. 1, in the case of a light control member including only one molded resin sheet, an adhesive layer described later is provided on the surface of the molded resin sheet that does not have a convex portion, and the present invention. It can be set as the light control member with an adhesion layer. The dimming member with the adhesive layer is more preferably glazed so that the adhesive layer is in contact with the indoor side surface of the window glass so that the base angle 2a is on the upper side and the base angle 2b is on the lower side. When light is incident on the adhesive layer from the window glass at a small incident angle (angle formed by light and a perpendicular to the adhesive layer surface), the light is refracted at the interface between the window glass and the adhesive layer, and then passes through the adhesive layer. Further, after refracting at the interface between the adhesive layer and the shaping resin sheet 1A, it proceeds in the shaping resin sheet 1A. Next, the light that has traveled through the shaping resin sheet 1A can be refracted at the interface between the shaping resin sheet 1A and the room (that is, the atmospheric layer in the room) and can enter the room.

  Moreover, the adhesive layer mentioned later is provided in the plane 8X of the light control member 8 shown in FIG. 2, and it is set as the light control member with an adhesive layer of this invention, and this adhesive layer is a chamber of a window glass. More preferably, when bonded to the window glass so that the base angle 2a is on the upper side and the base angle 2b is on the lower side so as to be in contact with the inner surface, a small incident angle (light and adhesive layer surface from the window glass to the adhesive layer) When light is incident at an angle formed by a perpendicular to the surface, the light is refracted at the interface between the window glass and the adhesive layer, then travels through the adhesive layer, and is further refracted at the interface between the adhesive layer and the shaping resin sheet 1A. Then, the process proceeds through the shaping resin sheet 1A. 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 9, then proceeds through the air layer 9, and further between the air layer 9 and the shaping resin sheet 1B. After being refracted at the interface, it can proceed through the shaping resin sheet 1B, and can further be refracted at the interface between the plane 8Y and the room (that is, the atmospheric layer in the room) to enter the room side.

  Here, in the illustrated embodiment, the second base angle 2b is preferably 90 °. Therefore, when the dimming member 8 is viewed from the outdoor side or the indoor side, streaks are visually recognized in any case. It becomes difficult.

  Furthermore, when the light control member includes only one shaping resin sheet and light is incident on the adhesive layer from the window glass at a large incident angle, the light is refracted at the interface between the window glass and the adhesive layer. Then, after proceeding through the adhesive layer and further refracting at the interface between the adhesive layer and the shaping resin sheet 1A, it proceeds through the shaping resin sheet 1A. Next, the light that has traveled through the shaping resin sheet 1A is totally reflected at the interface between the shaping resin sheet 1A and the atmospheric layer in the room, and can be prevented from entering the room.

  In addition, as shown in FIG. 2, for example, the light control member is formed by a pair of shaping resin sheets. When light enters the adhesive layer from the window glass at a large incident angle, the light is flat. After being refracted by 8X, it proceeds through the shaping resin sheet 1A, is totally reflected at the interface between the shaping resin sheet 1A and the air layer 9, and light can enter the air layer 9 and the shaping resin sheet 1B. However, the entrance of light into the room can be suppressed.

  In the present invention, the incident angle from the outdoor side to the plane 8X when light is no longer incident on the atmospheric layer in the room is called a specific angle.

  The specific angle can vary depending on 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 constituting the light control member 8, when the inclination angle 2a is 5 °, the specific angle is 63.9 °, When the inclination 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 tilt angle 2a is 7 °, the specific angle is about 60 ° when the refractive index is 1.5. Accordingly, 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 interface with the atmospheric layer in the room or the air layer 9. Is incident at an angle of 45 °. Since this angle is larger than the critical angle (θ _m = 41.8 °) of the interface between the shaping resin sheet 1A and the indoor atmospheric layer or the interface with the air layer 9, total reflection occurs, and light is transmitted at this interface. Can be reflected. This reflected light is reflected in the shaping resin sheet 1A and cannot enter the indoor air layer or air layer 9 or the shaping resin sheet 1B.

  On the other hand, for light incident at an angle smaller than a specific angle of 60 °, the interface between the shaping resin sheet 1A and the indoor air layer or the air layer 9 with respect to the indoor air layer or air layer 9 Since light is incident on the indoor atmosphere layer or the air layer 9 from the shaping resin sheet 1A at an angle smaller than the critical angle, no total reflection of the light occurs and the light can be refracted at each interface.

  When the air layer 9 is present, reverse refraction may occur when entering the shaping resin sheet 1B from the air layer 9, so that if the width of the air layer 9 is small, the air layer 9 is almost unaffected. It can be transmitted in the same manner as glass. For this reason, the thickness of the air layer 9 is desirably 2 mm or less. The lower limit of the thickness of the air layer 9 is about 0.01 mm from the viewpoint that the role of the air layer 9 can be exhibited. When the thickness of the air layer 9 is in the above range, the outside scenery looks the same as that of normal glass when the outside is viewed from the inside. Further, when a resin having a large refractive index is used, the inclination angle of the air layer 9 can be made smaller.

  For example, in the embodiment shown in FIGS. 1 and 2, the refractive indexes of the resins of the shaping resin sheets 1 </ b> A and 1 </ b> B constituting the light control member 8 are 1.5 and the inclination angle 2 a of the air layer 9 (molding resin). A pressure-sensitive adhesive layer is provided on the surface (for example, the surface 8X) of the light-modulating member 8 of the light control member 8 having a convex first section angle 2a) of the convex section of the sheet that is 7 °, The light control member with the pressure-sensitive adhesive layer of the present invention, and this light control member with the pressure-sensitive adhesive layer turned to the south, for example, in Tokyo so that the light control member 8 is in a standing state as shown in FIGS. Attached to the window glass. At this time, when the altitude of the sun is high and the incident angle from the outdoor side to the surface (for example, the surface 8X) that does not have the convex portion of the shaping resin sheet is larger than 60 °, for example, between April and September Then, the incidence of sunlight on the indoor side can be suppressed, the altitude of the sun is low, and the incident angle from the outdoor side to the surface (for example, the surface 8X) that does not have the convex portion of the shaping resin sheet is 60. When the angle is smaller than 0 °, for example, from October to March, the incident of sunlight into the indoor side is not suppressed and can be allowed.

  In the present 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 to the Northern Hemisphere, and is reversed in the Southern Hemisphere. Summer means from 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 the incidence of sunlight into the indoors in the summer and to allow it without inhibiting the incidence of sunlight into the indoors in the winter Since the altitude of the sun depends on the latitude, the inclination angle 2a may be set appropriately according to the latitude of the place where the light control member with the adhesive layer of the present invention is installed. The angle 2a may be made larger than 7 °, and the inclination angle 2a may be made smaller than 7 ° in a place where the latitude is smaller than Tokyo. In addition, what is necessary is just to set the 1st base angle 2a of the triangle of the cross section of the convex part of a shaping resin sheet in order to set the inclination angle 2a.

  In addition, when the altitude of the sun is high and the incident angle is higher than the specific angle, the incidence of sunlight into the room can be suppressed, but the light incident from below the specific angle is transmitted through normal glass. The exterior scenery can be seen in the same way as an ordinary glass window to be transparent.

  As for the light control member with the adhesion layer of this invention, the outer peripheral part (namely, edge part) of the light control member may be enclosed by the frame member. Since the outer periphery of the light control member 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 shaping resin sheets, these adjustments are made. It becomes easy to keep the thickness of the air layer or the adhesive layer between the mold resin sheets constant.

  In addition, there is no restriction | limiting in particular in the dimension of the frame member which can be used in this invention, a shape, and material.

  When the light control member with an adhesive layer of the present invention is used by being attached to a window glass or the like, usually, the light control member can be used in an upright state, that is, in a vertical posture, but at this time, it faces the lower end surface of the light control member. It is preferable to install a photovoltaic power generation panel. Here, sunlight having a large incident angle incident on the light control member with the adhesive layer of the present invention is reflected by the convex portion of the light control member as described above, and is easily condensed in the downward direction of the light control member. Electric power can be generated efficiently by the photovoltaic power generation panel arranged to face the lower end surface of the light control member. It is preferable that the light control member with the adhesion layer of this invention and the photovoltaic power generation panel are contacting, and may be joined by the adhesion layer demonstrated in detail below.

  In addition, the light control member with an adhesive layer of the present invention is a window member, for example, in the form of a sheet, a film, a panel, etc., on the outdoor side or indoor side of an arbitrary window glass or the like so that the adhesive layer surface becomes a contact surface. It can be used by sticking arbitrarily. In addition, in this invention, the member for windows means the product, apparatus, or device which can be attached to the translucent member of the window which can permeate | transmit light, such as a window glass.

  Here, when the light control member includes only one shaping resin sheet, the light control member with the adhesive layer of the present invention is placed on the indoor side of the window glass so that the surface having the convex portion is on the indoor side. Or it is preferable to stick and use on the outdoor side. For example, when arrange | positioning the light control member with the adhesion layer of this invention shown in FIG. 1 in the indoor side of a window glass, an adhesive layer is provided in the surface which does not have the convex part of the shaping resin sheet of the light control member 8, and a window Affix to the indoor side of the glass. Or when arrange | positioning the light control member with the adhesion layer of this invention in the outdoor side of a window glass, an adhesive layer is provided in the surface which has the convex part of the shaping resin sheet of a light control member, and the outdoor side of a window glass is provided. Affix to the surface.

  In addition, when the light control member includes two shaping resin sheets as shown in FIG. 2, even if an adhesive layer is provided on the surface 8 </ b> X of the light control member 8 and affixed to the indoor side surface of the window glass, An adhesive layer may be provided on the surface 8Y of the optical member 8 and attached to the outdoor surface of the window glass.

  The adherend to which the light control member with an adhesive layer of the present invention can be applied is not limited to the above-described window glass and the like as long as such light control performance is desired.

  In addition, the shaping resin sheet contained in the light control member which comprises the light control member with an adhesion layer of this invention is not limited to the above-mentioned thing, In the range which does not inhibit the effect of this invention, for example on one side You may use the shaping resin sheet in which the convex part discontinuous was formed in the width direction.

<Adhesive layer>
The adhesive layer in the light control member with an adhesive layer of this invention should just be what can stick the above-mentioned light control member to adherends, such as a window glass. The material for forming such an adhesive layer is not particularly limited as long as it can be attached to an adherend such as a window glass. For example, a pressure-sensitive adhesive, an active energy ray-curable adhesive, and thermosetting Examples of the pressure-sensitive adhesive include a mold-type pressure-sensitive adhesive, and an adhesive such as an active energy ray-curable adhesive and 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 described in detail below, but also includes a layer that can be formed from an adhesive. Be understood as having the property and / or adhesion.

  The thickness of the adhesive layer is preferably 1 μm to 10 mm, more preferably 5 μm to 1 mm, and still more preferably 10 μm to 500 μm. A thickness of 10 μm to 150 μm is particularly preferable.

  Conventionally known pressure-sensitive adhesives can be used. For example, an adhesive having an acrylic resin as a base resin (acrylic adhesive), an adhesive having a rubber resin as a base resin (Rubber adhesive), Adhesive with urethane resin as base resin (urethane adhesive), Adhesive with silicone resin as base resin (silicone adhesive), Polyvinyl ether resin as base material Examples thereof include a pressure-sensitive adhesive (polyvinyl ether pressure-sensitive adhesive) used as a resin. Among these, an acrylic pressure-sensitive adhesive which is a pressure-sensitive adhesive having an acrylic resin excellent in transparency, weather resistance, heat resistance and the like as a base resin is preferable.

  The pressure-sensitive adhesive is applied to the surface of the adherend (for example, window glass) and then pressed to apply the pressure-sensitive adhesive. Also, if the adherend has sufficient strength, a trace is left. It is a viscoelastic body that can be peeled without any problems. Therefore, by forming the pressure-sensitive adhesive layer from the pressure-sensitive pressure-sensitive adhesive, the light control member with the pressure-sensitive adhesive layer having the pressure-sensitive adhesive layer of the present invention can be repeatedly applied to the window glass and peeled off from the window glass. Thus, for example, it is possible to re-paste on a window glass or the like, which is excellent in convenience.

  As an acrylic adhesive, for example, (meth) acrylic acid ester such as butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, 2-ethylhexyl (meth) acrylate is used as a monomer. What uses resin formed by superposition | polymerization as base resin is mentioned. Such base resin may be used independently, may use 2 or more types together, and may use what copolymerized 2 or more types of (meth) acrylic acid ester. Furthermore, polar monomers may be copolymerized with these base resin. Examples of polar monomers include (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylate, and 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 of course be used alone, but usually a crosslinking agent can be used in combination. The crosslinking agent is 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 that form an ester bond with a carboxyl group, and polyisocyanate compounds that form an amide bond with a carboxyl group. Of these, polyisocyanate compounds are widely used as organic crosslinking agents.

  Examples of the rubber-based pressure-sensitive adhesive include styrene-based thermoplastic elastomers such as styrene-isobutylene-styrene block copolymer (SIS) and styrene-butadiene-styrene block copolymer (SBS), natural rubber, butyl rubber, isobutylene rubber, What uses isopropylene rubber etc. as base resin is mentioned. Such base resin may be used independently and may use 2 or more types together.

  As the urethane-based adhesive, for example, a polyurethane-based resin obtained by reacting an active hydrogen component containing at least a polyol with a polyisocyanate-based crosslinking agent using a catalyst such as a tertiary amine compound or an organometallic compound is used. The thing made into base-material resin is mentioned. A two-component curable urethane-based pressure-sensitive adhesive obtained by further reacting a polyurethane-based resin with a polyisocyanate-based crosslinking agent is also preferably used. In the combination of a polyol and a polyisocyanate-based crosslinking agent, the crosslinking density can be easily controlled, so that the adhesive force of the pressure-sensitive adhesive made of the polyurethane-based resin can be easily adjusted. Further, since the change in crosslink density with time is small, the change in adhesive force with time is also small.

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

  As the polyvinyl ether pressure-sensitive adhesive, polyethyl vinyl ether, polypropyl vinyl ether, polybutyl vinyl ether, poly-2-ethylhexyl vinyl ether or the like can be used as a base resin.

  Here, the above-mentioned pressure-sensitive adhesive capable of forming a pressure-sensitive adhesive layer includes, in addition to the above-mentioned base resin and cross-linking agent, as necessary, the pressure-sensitive adhesive force, cohesive force, viscosity, elastic modulus, glass transition In order to adjust the temperature and the like, for example, natural or synthetic resins, tackifying resins, antioxidants, dyes, pigments, antifoaming agents, corrosive agents, photopolymerization initiators, and other appropriate additives are added. It can also be blended. Furthermore, it can also be set as the adhesion layer which contains microparticles | fine-particles and shows light-scattering property. Moreover, an antioxidant, an ultraviolet absorber, etc. may be mix | blended with the adhesion layer which can be formed from the above-mentioned adhesive. Examples of ultraviolet absorbers include salicylic acid ester compounds, benzophenone compounds, benzotriazole compounds, cyanoacrylate compounds, and nickel complex compounds.

  An active energy ray-curable adhesive has the property of being cured by irradiation with active energy rays such as ultraviolet rays and electron beams, and has adhesive properties even before irradiation with active energy rays. It is a pressure-sensitive adhesive that adheres and is cured by irradiation with active energy rays and has a property of adjusting the adhesion. As the active energy ray curable adhesive, it is particularly preferable to use an ultraviolet curable adhesive. The 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 blended, and if necessary, a photopolymerization initiator and a photosensitizer can be blended.

  Thermosetting pressure-sensitive adhesives have the property of being cured by heating, and have the property of having adhesiveness before being heated and in close contact with the adherend, and being cured by heating to adjust the adhesion. It is a pressure-sensitive adhesive. The thermosetting pressure-sensitive adhesive generally contains an acrylic pressure-sensitive adhesive and a thermopolymerizable compound as main components. Usually, a crosslinking agent is further blended, and if necessary, a thermal polymerization initiator can be blended.

  The active energy ray-curable adhesive has a property of being cured by irradiation with active energy rays such as ultraviolet rays and electron beams. The active energy ray-curable adhesive is preferably a so-called solventless adhesive that does not contain an organic solvent. (Meth) acrylate adhesives, ene / thiol adhesives, epoxy adhesives, oxetane adhesives, epoxy / oxetane adhesives, adhesives using photo radical polymerization reactions such as unsaturated polyester adhesives, Adhesives utilizing a cationic photopolymerization reaction such as epoxy, vinyl ether and oxetane.

  A thermosetting adhesive has a property of being cured by heating. As the thermosetting adhesive, a so-called solventless adhesive that does not contain an organic solvent is preferable. Thermosetting adhesives include adhesives that cure at room temperature or higher. Specifically, epoxy adhesives, polyurethane adhesives, (meth) acrylate adhesives, ene / thiol adhesives, Examples include silicone adhesives, polyester adhesives, unsaturated polyester adhesives, cyanoacrylate adhesives, nylon adhesives, and modified olefin adhesives.

  In addition, examples of the adhesive that forms the pressure-sensitive adhesive layer include a water-based adhesive using a polyvinyl alcohol-based resin aqueous solution, a water-based two-component urethane emulsion adhesive, and the like. Of these, an aqueous polyvinyl alcohol resin solution is preferred. Polyvinyl alcohol 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. There are vinyl alcohol copolymers obtained by saponifying polymers, and modified polyvinyl alcohol polymers obtained by partially modifying the hydroxyl groups. A polyhydric aldehyde, a water-soluble epoxy compound, a melamine compound, a zirconia compound, a zinc compound, or the like may be added as an additive to the water-based adhesive.

  The pressure-sensitive adhesive layer may contain one or more other components in addition to the above-described pressure-sensitive adhesive component or adhesive component as long as the effects of the present invention are not impaired. Other components include, for example, other polymer components, softeners, anti-aging agents, curing agents, plasticizers, fillers, thermal polymerization initiators, photopolymerization initiators, ultraviolet absorbers, light stabilizers, colorants ( Pigments and dyes), solvents (organic solvents), surfactants (eg, ionic surfactants, silicone surfactants, fluorosurfactants, etc.), crosslinking agents (eg, polyisocyanate crosslinking agents, silicones) System crosslinking agents, epoxy crosslinking agents, alkyl etherified melamine crosslinking agents, etc.). The thermal polymerization initiator and the photopolymerization initiator can be included in the material for forming the base resin.

  As a method for forming the 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 plate method, A method of applying a material for forming an adhesive layer on one surface of the light control member by die coating, dip coating, spraying, etc .; a material for forming the adhesive layer on one surface of the light control member in a sheet form And a method of laminating a pressure-sensitive adhesive sheet or a pressure-sensitive adhesive sheet formed by applying a material for forming an adhesive layer on both surfaces of the sheet, using an arbitrary sheet as a base material. Commercially available products may be used as the pressure-sensitive adhesive and pressure-sensitive adhesive sheet, and examples of commercially available pressure-sensitive adhesive sheets include NSS manufactured by Shin-Tac Kasei Co., Ltd. and P-3132 manufactured by Lintec Corporation.

  Examples of the method for forming the pressure-sensitive adhesive layer from the water-based adhesive include a method in which the water-based adhesive is applied to one surface of the light control member, and then moisture is reduced, preferably removed, from the water-based adhesive by drying or the like. It is done. Examples of the method for applying the water-based adhesive include the same method as the method for applying the material for forming the above-mentioned adhesive layer.

  In the method of forming an adhesive layer from an aqueous adhesive, the drying temperature is preferably 10 ° C to 90 ° C. When the temperature is lower than 10 ° C., the adhesive layer and the adherend such as the window glass tend to be easily peeled off. If it is 90 ° C. or higher, the water-based adhesive may be deteriorated by heat. The drying time is preferably 10 to 1000 seconds.

  On one side of the light control member forming the adhesive layer, plasma treatment, corona treatment, ultraviolet irradiation treatment, flame (flame) treatment, 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 alkaline aqueous solution such as sodium hydroxide or potassium hydroxide.

  The adhesive layer surface of the light control member with an adhesive layer of the present invention is provided with a sheet that can be peeled off from the adhesive layer surface when the light control member with an adhesive layer is bonded to an adherend such as a window glass. Also good. By providing such a sheet on the pressure-sensitive adhesive layer surface of the light control member with the pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer surface can be protected, and for example, a decrease in pressure-sensitive adhesive performance due to dirt on the pressure-sensitive adhesive layer surface can be suppressed.

  As a method of sticking the light-modulating member with the pressure-sensitive adhesive layer of the present invention obtained by forming an adhesive layer on one surface of the light-modulating member from an energy ray curable adhesive, for example, to an adherend such as a window glass A method of bringing the light control member with an adhesive layer into contact with an adherend such as a window glass so that the surface of the adhesive layer is in contact with the adherend such as a window glass, and then curing the adhesive by irradiating active energy rays. Can be mentioned. The light source of the active energy ray is not particularly limited, but an active energy ray having a light emission distribution at a wavelength of 400 nm or less is preferable. Specifically, the low-pressure mercury lamp, the medium-pressure mercury lamp, the high-pressure mercury lamp, the ultrahigh-pressure mercury lamp, the chemical lamp, and the black light lamp A microwave excitation mercury lamp, a metal halide lamp and the like are preferably used.

<Spattering prevention sheet>
The light control member with an adhesive layer of the present invention can also be used as a scattering prevention sheet. In the present invention, the anti-scattering sheet is attached to a protected material such as glass, and can prevent scattering of fragments and the like when crushing.

  For example, by sticking the surface of the pressure-sensitive adhesive layer with the pressure-sensitive adhesive layer of the present invention to the glass, the glass can be protected, and when the glass is broken by some impact, the pressure-sensitive adhesive layer and the shaping resin sheet are supported. It becomes a body and it can prevent that the broken piece of glass splashes around.

  The main application of the anti-scattering sheet is not particularly limited as long as it is an application that needs to be bonded to a protected body and protected, for example, in a window glass of a public facility or an exercise facility. Can be used.

  EXAMPLES Hereinafter, although an Example demonstrates this invention more concretely, this invention is not limited by these Examples.

Example 1
Acrylic resin (Sumipex EX (refractive index: 1.490), manufactured by Sumitomo Chemical Co., Ltd.) is supplied to an extruder with a screw diameter of 65 mm and melt-kneaded at 210-260 ° C. A continuous resin sheet was produced by extrusion into a sheet at a die temperature of 260 ° C. The extruded continuous resin sheet is sandwiched (pressed) between a first pressing roll, which is a mirror-cooled cooling roll having a surface plated with chromium, and a second pressing roll having a transfer mold on the surface, and the rotation of each pressing roll. The transfer mold was transferred onto the surface of the continuous resin sheet while being sequentially conveyed. Thereafter, the continuous resin sheet is conveyed in a state of being in close contact with the second pressing roll, and then sandwiched (pressed) between the second pressing roll and a third pressing roll which is a mirror-finished roll having a surface plated with chrome. Then, it was sequentially conveyed by the rotation of each pressing roll, and then taken up by a take-up roll, and a molded resin sheet having a convex portion on one surface and a refractive index of 1.490 was obtained (thickness L: 200 μm). .

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

  The pressure-sensitive acrylic pressure-sensitive adhesive (NSS (refractive index: 1.470), New Tack Kasei Co., Ltd.) is applied to the surface of the obtained molded resin sheet that does not have a convex portion with a hand roll. A pressure-sensitive adhesive layer with a pressure-sensitive adhesive layer of the present invention was produced by forming a pressure-sensitive adhesive layer of 100 μm.

(Example 2)
In the same manner as in Example 1, a molded resin sheet having a convex portion on one surface and a refractive index of 1.490 was obtained. The pressure-sensitive acrylic pressure-sensitive adhesive (P-3132 (refractive index 1.466), Lintec Co., Ltd.) is applied to the surface of the obtained molded resin sheet that does not have a convex portion with a hand roll. A 10 μm adhesive layer was formed to produce a light control member with an adhesive layer of the present invention.

(Example 3)
Instead of acrylic resin, polycarbonate resin (Caliber 301-15 (refractive index: 1.590), manufactured by Sumika Stylon Polycarbonate Co., Ltd.) is used and has a convex portion on one surface, and the refractive index is 1.590. The light control member with the adhesion layer of this invention was produced like Example 1 except having obtained the shaping resin sheet.

(Comparative Example 1)
In the same manner as in Example 1, a molded resin sheet having a convex portion on one surface and a refractive index of 1.490 was obtained. The obtained molded resin sheet was not provided with an adhesive layer.

[Dimming performance evaluation]
Each light control performance at an incident angle of 30 ° and 70 ° was evaluated. Using a simulated solar solar simulator, the amount of light transmitted through the sample (transmitted light amount) at an incident angle of 0 °, + 30 °, and + 70 ° is measured, and the transmitted light amount at an incident angle of 30 ° with respect to the transmitted light amount at an incident angle of 0 ° and The ratio of the amount of transmitted light at an incident angle of 70 ° was calculated (the amount of transmitted light at an incident angle of 30 ° / the amount of transmitted light at an incident angle of 0 °, and the amount of transmitted light at an incident angle of 70 ° / the transmission at an incident angle of 0 °). Light intensity). The results are shown in Table 1.

  Here, the amount of transmitted light (%) of each sample is the ratio of the amount of light obtained by measurement with the sample to the amount of light obtained by measuring the amount of light obtained with no sample as 100%. This is a value obtained by calculation.

  In addition, about Examples 1-3, what stuck the light control member with an adhesion layer of 7 cm □ to the glass plate of 10 cm □ with a thickness of 5 mm so that the surface of the adhesion layer was in contact with the glass plate was used as a sample. In the samples of Examples 1 to 3, there is an adhesive layer between the light control member with the adhesive layer and the glass plate. For Comparative Example 1, a 7 cm square shaped resin sheet was affixed to a glass plate by attaching its peripheral edge with cello tape (NT-24, Nichiban Co., Ltd.) so that the surface having the convex portion was on the outside. Was used as a sample.

  In the sample of Comparative Example 1, an air layer is present between the light control member and the glass plate, and the air layer is interposed between the light control member and the glass plate. 3 and the refractive index (1.000) of the air layer was defined as the refractive index B.

  Thus, in Comparative Example 1, since there is no adhesive layer and the refractive index difference is 0.490, the amount of transmitted light and the light transmittance are higher than those in Examples 1 to 3 at an incident angle of 70 °. all right. This result shows that in Comparative Example 1, light is not sufficiently suppressed at an incident angle of 70 °.

  Moreover, when not using an adhesion layer like the comparative example 1, it turned out that a desired light control effect is not acquired by the air layer which exists in them only by arrange | positioning a light control member to a glass plate. .

  On the other hand, in Examples 1 to 3 of the present invention, at an incident angle of 70 °, the light transmittance is about ½ of that in Comparative Example 1, resulting in excellent light control performance (light suppression effect). all right. Such an effect can also be attributed to the fact that the absolute value of the refractive index difference is 0.2 or less.

  The light control member with an adhesive layer of the present invention can be used as a window member (for example, a film, a sheet, or a panel) that can be attached to, for example, a window glass to give excellent light control performance. Moreover, it is useful also as a scattering prevention sheet | seat which can prevent scattering at the time of crushing, such as a window glass.

DESCRIPTION OF SYMBOLS 1 Molding resin sheet 2 Bottom angle 3 Resin insertion port 4 Die 5 Press roll 6 Transfer mold 7 Extruder 8 Light control member 9 Air layer

Claims (14)

  A dimming member with an adhesive layer comprising a dimming member comprising at least one shaping resin sheet having a convex portion on one surface, and an adhesion layer disposed on one surface of the shaping resin sheet. Yes, 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 0.2 or less. Light control member with layer.   The light control member with the adhesion layer of Claim 1 which has the said adhesion layer in the surface which does not have the convex part of the said shaping resin sheet.   The light control member with the adhesion layer of Claim 1 or 2 whose thickness of the said adhesion layer is 1 micrometer or more and 500 micrometers or less.   Any one of Claims 1-3 which has a some convex part, the height of the said convex part is 1 micrometer or more and 1 cm or less, and the pitch space | interval of the convex part which the said several convex part adjoins is 10 micrometers or more and 10 cm or less. The light control member with an adhesion layer of Claim 1.   The light control member with the adhesion layer of any one of Claims 1-4 whose cross-sectional shape of the said convex part is a substantially triangle.   The light control member with an adhesive layer according to claim 5, 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 resin molding sheets having the convex portions are included, the convex portions of the molding resin sheet are arranged to face each other so as to correspond to each other, and an air layer exists between the molding resin sheets. The light control member with the adhesion layer of any one of 1-6.   Including two shaped resin sheets having the convex portions, the convex portions of the molded resin sheet are arranged facing each other so as to correspond to each other, and an adhesive layer is present between the molded resin sheets, The light control member with an adhesion layer of any one of claim | item 1 -6.   The light control member with an adhesive layer according to claim 7 or 8, wherein the convex portions of the two shaped resin sheets have a point-symmetric relationship with each other.   The light control member with the adhesion layer of any one of Claims 1-6 containing only the said shaping | molding resin sheet.   The light control member with the adhesion layer of any one of Claims 1-10 which further contains the frame member arrange | positioned at the outer peripheral part of the said light control member.   The light control member with the adhesion layer of any one of Claims 1-11 used as a member for windows.   The shaping resin sheet used with the adhesion layer in the light control member with an adhesion layer of any one of Claims 1-12.   The scattering prevention sheet which consists of a light control member with the adhesion layer of any one of Claims 1-12.

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