WO2015111562A1 - Feuille et panneau d'atténuation de lumière - Google Patents

Feuille et panneau d'atténuation de lumière Download PDF

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Publication number
WO2015111562A1
WO2015111562A1 PCT/JP2015/051308 JP2015051308W WO2015111562A1 WO 2015111562 A1 WO2015111562 A1 WO 2015111562A1 JP 2015051308 W JP2015051308 W JP 2015051308W WO 2015111562 A1 WO2015111562 A1 WO 2015111562A1
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WIPO (PCT)
Prior art keywords
light control
layer
light
weather
control sheet
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PCT/JP2015/051308
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English (en)
Japanese (ja)
Inventor
立沢　雅博
崇宏 八木
敬一 村上
勇樹 熊谷
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大日本印刷株式会社
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Priority to JP2015533773A priority Critical patent/JPWO2015111562A1/ja
Publication of WO2015111562A1 publication Critical patent/WO2015111562A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid

Definitions

  • the present invention relates to a light control sheet and a light control plate having a light control function.
  • a light control plate for example, a light control sheet in which a light control layer in which a light control suspension in which oriented particles capable of responding to voltage are dispersed is dispersed in a resin matrix is sandwiched between transparent conductive substrates Is provided on the surface of the transparent substrate (see Patent Document 1).
  • This is to switch the display by applying a voltage to the light control sheet and adjusting the amount of transmitted light according to the response of the oriented particles to the voltage.
  • the oriented particles in the light control layer are oriented, so that incident light can pass through the light control sheet, and the light control plate is transparent so that the outside can be clearly seen. State (hereinafter referred to as a bright state).
  • the oriented particles are not oriented, so that incident light is absorbed, scattered or reflected by the Brownian motion of the oriented particles. Therefore, light cannot pass through the light control sheet, and the light control plate is in a state where the outside cannot be visually recognized due to light shielding (hereinafter referred to as a dark state).
  • the light control sheet requires a long time to shift the oriented particles to the oriented state by applying a voltage, or to stop the application of the voltage and to move the oriented particles to a non-oriented state. There is a problem that it is difficult to instantaneously switch between the state and the bright state. In addition, it is necessary to use together with an electrode layer having wiring or the like in order to apply a voltage, and further, since power for applying a voltage is also necessary, the cost for installing and using the light control plate increases. It was difficult to use easily.
  • the light control glass using such a slide mechanism may be referred to as “slide light control glass”.
  • FIG. 6 is an explanatory diagram for explaining the light control function of the slide-type light control glass.
  • the pattern retardation layers 40A and 40B in FIG. 6 have a pattern in which the first retardation regions O1 and O1 ′ and the second retardation regions O2 and O2 ′ are alternately formed in a stripe shape.
  • the in-plane slow axes a of the first phase difference regions O1 and O1 ′ and the second phase difference regions O2 and O2 ′ have an orthogonal relationship.
  • the in-plane retardations of the first retardation regions O1, O1 ′ and the second retardation regions O2, O2 ′ indicate ⁇ / 4.
  • the polarizing plates 50A and 50B have orthogonal polarization axes.
  • the polarizing plate 50A when light is transmitted from the light control unit 60A to the light control unit 60B, the polarizing plate 50A has the same direction as the polarization axis direction Y of the polarizing plate 50A from the incident light L1. Only the linearly polarized light L2 oscillating in the direction is transmitted. The linearly polarized light L2 is converted into circularly polarized light L3 in which the phase difference of ⁇ / 4 is rotated in the opposite direction in the first retardation region O1 and the second retardation region O2 of the pattern retardation layer 40A.
  • the circularly polarized light L3 is incident on the dimming unit 60B, and the phase difference of ⁇ / 4 is further rotated in the opposite directions in the first retardation region O1 ′ and the second retardation region O2 ′ of the pattern retardation layer 40B. It is converted into linearly polarized light L4.
  • the pattern retardation layers 40A and 40B have the same in-plane slow axis direction, that is, the same orientation direction, for example, the first retardation regions O1 and O1 ′ having the corresponding relationship,
  • the direction of rotation is the same. That is, the linearly polarized light L4 is obtained by rotating the vibration direction of the linearly polarized light L2 by 90 °.
  • the vibration direction of the linearly polarized light L4 is the same as the polarization axis direction X of the polarizing plate 50B, it can be transmitted through the polarizing plate 50B, and the sliding light control glass 100 is brightened by the emitted light L5. It becomes a state.
  • FIG. 6B shows an example in which the light control unit 60B of FIG. 6A is slid in a direction orthogonal to the phase difference region pattern.
  • the first phase difference region O1 and the second phase difference region O2 ′ that are in a corresponding relationship have the in-plane slow axis directions orthogonal to each other.
  • the direction of rotation is reversed. That is, the circularly polarized light whose phase difference is rotated by ⁇ / 4 in the first phase difference region O1 is rotated in the opposite direction by ⁇ / 4 in the second phase difference region O2 ′, and the linearly polarized light L4 is linear.
  • the vibration direction of the linearly polarized light L4 is orthogonal to the polarization axis direction X of the polarizing plate 50B, cannot pass through the polarizing plate 50B, and the sliding light control glass 100 is in a dark state.
  • JP 2013-210670 A International Publication No. 2012/092443 Japanese Patent No. 4881208
  • the light control plate is usually used as a member on which light such as window glass is incident, for the purpose of adjusting solar radiation and ensuring privacy.
  • the above-mentioned slide-type light control glass has a problem that the light control layer easily absorbs ultraviolet rays or the like contained in the transmitted light and thus easily deteriorates, and the light control function decreases with time.
  • a weathering agent such as an ultraviolet absorber is added to the light control layer, there is a problem that discoloration of the light control layer occurs. The reason for this is not necessarily clear, but it is considered that discoloration occurs when the weathering agent reacts with other materials constituting the light control layer in the light control layer.
  • the inventors of the present invention provide a light control sheet comprising a light control layer and an adhesive layer for bonding the light control layer to an adherend such as glass.
  • the above-mentioned adhesive layer is made into a weather-resistant adhesive layer containing the above-mentioned weathering agent without adding any weathering agent, and studies are being made to improve the weather resistance and durability of the entire light control sheet.
  • the light control layer does not contain a weathering agent such as an ultraviolet absorber, so that it is possible to prevent discoloration of the light control layer due to the inclusion of the weathering agent, and to the light incident on the light control sheet.
  • the weatherproof adhesive layer contains a weathering agent, the weatherability of the weatherproof adhesive layer itself can be improved, so it is assumed that the weather resistance and durability of the entire light control sheet are improved.
  • Patent Document 3 as a pressure-sensitive adhesive used when a light-transmitting film is bonded to a window glass or the like, a (meth) acrylic acid ester-based copolymer having a carboxyl group, a metal chelate-based crosslinking is used. It has been disclosed that by using a weather-resistant adhesive containing an agent and a triazine-based ultraviolet absorber, the ultraviolet deterioration of the weather-resistant adhesive is used to suppress the photodegradation of the bonded film.
  • Patent Document 3 Even when the one disclosed in Patent Document 3 is used as the weather-resistant adhesive layer positioned on the light incident side of the light control layer, the weather control and durability of the entire light control sheet are sufficiently improved. There is a problem that it cannot be achieved.
  • the present invention has been made in view of the above circumstances, and a main object of the present invention is to provide a light control sheet and a light control plate excellent in weather resistance and durability.
  • the present inventors have found that the type of ultraviolet absorber contained in the weather resistant adhesive layer as a weather resistant agent contributes to the suppression of deterioration of the light control layer. I found it. Among them, the present inventors absorb the wavelength light that causes the deterioration of iodine, and that the main factor of the deterioration of the light control layer is due to the deterioration of iodine contained in the polarizing plate constituting the light control layer. It has been found that the weather resistance and durability of the entire light control sheet can be improved by selecting the ultraviolet absorber, and the present invention has been completed.
  • the present invention includes a light control layer in which two or more regions that change the polarization state or phase state of transmitted light are formed in a fixed shape at a fixed interval, and is disposed on one surface of the light control layer.
  • An adhesive polymer obtained by crosslinking an acrylic copolymer and a metal chelate crosslinking agent or a crosslinking agent of an isocyanate crosslinking agent, and a wavelength of 380 nm.
  • a light control sheet comprising an ultraviolet absorber having a light transmittance of 60% or less.
  • the ultraviolet absorber “having a light transmittance of 60% or less at a wavelength of 380 nm” may be referred to as “(predetermined) optical properties”. .
  • the weather-resistant adhesive layer includes the above-described composition
  • wavelength light that causes deterioration of the material constituting the light control layer, especially the light control layer is configured.
  • the wavelength light which causes the deterioration of iodine contained in the polarizing plate to be performed can be selectively and sufficiently absorbed in the ultraviolet absorbent exhibiting the optical characteristics in the weather-resistant adhesive layer.
  • the weather-resistant adhesive layer contains the above-described composition, it is possible to suppress the light deterioration of the weather-resistant adhesive layer itself. Thereby, it can be set as the light control sheet
  • the ultraviolet absorber is preferably a benzotriazole ultraviolet absorber. Since the wavelength band of light that can be absorbed by the UV absorber can overlap with the wavelength band of the wavelength light that causes deterioration of the material that constitutes the light control layer, it can more effectively improve the weather resistance of the light control layer. This is because it can be improved.
  • the said light control layer has a pattern phase difference layer and the polarizing plate arrange
  • this invention has a 1st light control part which has a 1st light control sheet, and a 2nd light control part which has a 2nd light control sheet, The said 1st light control part and the said 2nd light control part
  • the first light control sheet and the second light control sheet are arranged so as to face each other with a space, the first light control sheet and the second light control sheet, An adhesive layer and at least a light control layer formed on the adhesive layer, wherein the light control layer has a constant distance between two or more regions that change the polarization state or phase state of transmitted light.
  • the adhesive layer of at least one of the first light control sheet and the second light control sheet is formed of an acrylic copolymer and a cross-linking agent of a metal chelate cross-linking agent or an isocyanate cross-linking agent.
  • a cross-linked adhesive polymer, and a wavelength of 380 nm Is a weather-resistant adhesive layer containing an ultraviolet absorber having a transmittance of 60% or less, and at least one of the first dimming portion and the second dimming portion intersects the region of the dimming layer.
  • a light control plate which is movable in a surface direction.
  • the weather control adhesive layer is provided.
  • wavelength light that causes deterioration of the material constituting the light control layer particularly wavelength light that causes deterioration of iodine contained in the polarizing plate that constitutes the light control layer, First, it can be selectively and sufficiently absorbed in the ultraviolet absorbent exhibiting the optical characteristics in the weather-resistant adhesive layer.
  • the said 1st light control part is provided with the said 1st light control sheet
  • the said 2nd light control part is a 2nd transparent substrate. It is preferable that the second light control sheet is provided on one surface. This is because, for example, when the light control plate of the present invention is arranged in a wide area, it is possible to improve the mechanical strength of each light control unit.
  • the light having a wavelength that causes deterioration of the light control layer is selectively absorbed by an ultraviolet absorbent having predetermined optical characteristics, thereby adjusting the light control sheet. Since the deterioration of the light layer is suppressed and the light deterioration of the weather-resistant adhesive layer itself can be suppressed, there is an effect of having high weather resistance and durability.
  • the light control sheet of the present invention includes a light control layer in which two or more regions that change the polarization state or phase state of transmitted light are formed in a fixed shape with a fixed interval, and the light control layer An adhesive polymer formed by crosslinking an acrylic copolymer and a metal chelate cross-linking agent or a cross-linking agent of an isocyanate cross-linking agent. And an ultraviolet absorber exhibiting predetermined optical characteristics.
  • the light control sheet of the present invention is obtained by bonding the two light control sheets 10 ⁇ / b> A and 10 ⁇ / b> B to the adherends 11 ⁇ / b> A and 11 ⁇ / b> B such as window glass to face each other. It is used for a slide-type light control plate that slides one side of 10B.
  • the light control plate changes the light transmittance and adjusts the amount of transmitted light by changing the correspondence between the pattern regions P1 and P2 in the light control sheet 10A and the pattern regions P1 and P2 in the light control sheet 10B.
  • the display can be switched. That is, as shown in FIG.
  • the pattern region P1 in the light control sheet 10A and the pattern region P1 in the light control sheet 10B, and the pattern region P2 in the light control sheet 10A and the pattern region P2 in the light control sheet 10B correspond to each other.
  • the incident light L in is transmitted through the light control plate may be a bright state more dimming plate emitted light L out.
  • the pattern region P1 in the light control sheet 10A and the pattern region P2 in the light control sheet 10B, and the pattern region P2 in the light control sheet 10A and the pattern region P1 in the light control sheet 10B correspond to each other.
  • the light control layer used for the light control plate when the weather control agent such as an ultraviolet absorber is contained in the light control layer, the light control layer is usually discolored. Cannot add weathering agents. Therefore, the inventors of the present invention have adopted a weather-resistant adhesive layer containing a weathering agent as an adhesive layer to be bonded to an adherend such as a window glass located on the light incident side, and the light control layer is deteriorated. Investigations are being made to prevent deterioration of the light control layer by first absorbing the wavelength light that causes it in the weatherproof adhesive layer. At this time, since the weather-resistant adhesive layer itself also contains a weathering agent, it is possible to improve the weather resistance, and it is expected that the light-adjusting sheet is excellent in weather resistance and durability. However, even with the light control sheet as described above, there is a problem in that the light control layer is deteriorated over time and the light control function cannot be maintained over a long period of time.
  • the present inventors have made extensive studies on the combination of the light control layer and the weather resistant adhesive layer, and as a weathering agent contained in the weather resistant adhesive layer, the light having a specific wavelength is used. It has been found that the deterioration of the light control layer is sufficiently suppressed by selecting an ultraviolet absorber having a light transmittance of a predetermined value or less. The reason is presumed as follows. That is, the dimming layer has a layer configuration such as a polarizing plate or a pattern retardation layer in order to change the polarization state or phase state of transmitted light.
  • the iodine contained in the polarizer of the polarizing plate, the surface of the polarizing plate Deterioration of the polarizing plate protective film and the liquid crystal constituting the pattern retardation layer provided on the substrate is accelerated by absorbing specific wavelength light among wavelength light such as ultraviolet rays. For this reason, due to the light deterioration of the material contained in the layer which comprises a light control layer, deterioration of the whole light control layer will arise. Among them, as a result of intensive studies on the cause of deterioration of the light control layer by the present inventors, the deterioration of iodine contained in the polarizer of the polarizing plate constituting the light control layer is the largest in the deterioration of the entire light control layer.
  • ultraviolet absorbers have different wavelength bands that can be specifically absorbed depending on the type of the ultraviolet absorbers, and deteriorate the wavelength bands that can be specifically absorbed by ultraviolet absorbers and the respective materials constituting the above-mentioned light control layer.
  • By overlapping the wavelength band of the specific wavelength light it is possible to selectively and sufficiently absorb the wavelength light that causes the deterioration of each layer constituting the light control layer, and to suppress the deterioration of the entire light control layer. It is guessed.
  • the deterioration of iodine contained in the polarizer of the polarizing plate contributes most to the deterioration of the light control layer, it promotes the deterioration of iodine as an ultraviolet absorber contained in the weather-resistant adhesive layer.
  • the ultraviolet light absorber selectively and sufficiently absorbs the wavelength light that causes the deterioration of iodine, and iodine absorbs light having the above wavelength. Can be prevented.
  • the wavelength light that causes the deterioration of the material constituting the light control layer is also absorbed to some extent by overlapping with a part of the absorption wavelength band of the ultraviolet absorber. Thereby, it is estimated that deterioration of the whole light control layer can be suppressed.
  • two or more regions that change the polarization state or phase state of transmitted light are formed in a certain shape with a certain interval. It means that two or more regions that change state are continuously formed with a certain width and a certain shape. That is, each area
  • the fact that the regions are spaced apart from each other means that the length connecting the centers of two adjacent regions usually corresponds to the width of the region.
  • the first region and the second region that change the polarization state or phase state of the transmitted light have a certain width and a certain shape, and are adjacent to each other so that both regions are alternately arranged.
  • the three or more regions that change the polarization state or phase state of transmitted light have a certain width and a certain shape, and are formed adjacent to each other so that each region is repeatedly arranged.
  • a plurality of regions that change the polarization state or phase state of transmitted light have a certain width and a certain shape, and are formed adjacent to each other so that the polarization state or phase state gradually changes. It means that Regarding the definition that “two or more regions are formed in a certain shape with a certain interval”, the retardation region in the retardation layer, the alignment region in the alignment layer, and the polarizing region in the polarizing plate described later also apply. The same shall apply.
  • Weather-resistant adhesive layer The weather-resistant adhesive layer in the present invention is disposed on one surface of the light control layer, and an acrylic copolymer and a metal chelate crosslinking agent or an isocyanate-based crosslinking agent are crosslinked. And an ultraviolet absorber exhibiting predetermined optical characteristics.
  • the weather-resistant adhesive layer includes the above-described composition, it is possible to suppress light deterioration of the weather-resistant adhesive layer itself and the entire light control sheet by the ultraviolet absorber.
  • the weathering colored layer itself may exhibit a color and the light transmittance of the light control sheet may decrease.
  • the layer contains an ultraviolet absorber exhibiting predetermined optical characteristics, it is possible to prevent coloration due to the weathering agent and to exhibit high light transmittance.
  • Adhesive polymer The adhesive polymer in the weather-resistant adhesive layer is obtained by crosslinking an acrylic copolymer and a crosslinking agent of a metal chelate crosslinking agent or an isocyanate crosslinking agent.
  • the acrylic copolymer is an adhesive main agent, and is preferably one that is crosslinked by heating during a crosslinking reaction with a crosslinking agent described later. This is because in the case of crosslinking by light irradiation, the weather resistance of the weather-resistant adhesive layer after curing may be affected.
  • the acrylic copolymer include an acrylic ester copolymer obtained by copolymerizing a (meth) acrylic ester as a main component and a (meth) acrylic monomer.
  • (meth) acrylic acid ester means acrylic acid ester or methacrylic acid ester. The same applies to the (meth) acrylic monomer in the following description.
  • (meth) acrylic acid esters examples include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, and (meth) acrylic acid.
  • butyl acrylate, isobutyl acrylate, t-butyl acrylate, butyl methacrylate, isobutyl methacrylate, and t-butyl methacrylate are preferable.
  • Examples of (meth) acrylic monomers include monofunctional (meth) acrylates, bifunctional to tetrafunctional polyfunctional (meth) acrylates, and the like. About these (meth) acrylic monomers, what has a functional group which becomes a crosslinking point with the crosslinking agent mentioned later and copolymerizes with acrylic ester is preferable. Examples of the functional group serving as a crosslinking point include a hydroxyl group, a carboxyl group, an amide group, an amino group, an epoxy group, and a cyano group. In the (meth) acrylic monomer, one of these functional groups is included in the molecular structure. It is preferable to have one kind or four kinds as a whole.
  • hydroxyl group-containing (meth) acrylic monomer examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl acrylate and the like.
  • carboxyl group-containing (meth) acrylic monomer examples include acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid, fumaric acid, and isocrotonic acid.
  • amide group-containing (meth) acrylic monomers examples include (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-butyl (meth) acrylamide, N-methylol (meth) acrylamide, and N-methylolpropane (meth).
  • examples include acrylamide, N-methoxymethyl (meth) acrylamide, and N-butoxymethyl (meth) acrylamide.
  • amino group-containing (meth) acrylic monomer examples include aminoethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, t-butylaminoethyl (meth) acrylate, and the like.
  • epoxy group-containing (meth) acrylic monomer examples include glycidyl (meth) acrylate and methyl glycidyl (meth) acrylate.
  • Examples of the cyano group-containing acrylic monomer include acrylonitrile and methacrylonitrile.
  • acrylic monomers include, for example, 1,6-hexanediol di (meth) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol Di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, (poly) propylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, pentaerythritol di (meta) ) Acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, glycerin Di (meth) acrylate, epoxy acrylate, polyester acrylate,
  • vinyl esters such as vinyl acetate, styrene monomers such as styrene and ⁇ -methylstyrene, acrylic monomers of the above-mentioned (meth) acrylic acid esters and the like can be mentioned.
  • the (meth) acrylic monomer constituting the acrylic copolymer butyl acrylate, isobutyl acrylate, t-butyl acrylate, butyl methacrylate, isobutyl methacrylate, t-butyl methacrylate and the like are preferably used. It is done.
  • the acrylic copolymer is not particularly limited with respect to the copolymerization form, and may be any of a random copolymer, a block copolymer, and a graft copolymer. Preferably there is.
  • the weight average molecular weight (Mw) of the acrylic copolymer is not particularly limited as long as the weather-resistant adhesive layer in the present invention can exhibit a desired adhesive force. It is preferably in the range of ⁇ 1000000, in particular in the range of 750,000 to 850000. If the weight average molecular weight is smaller than the above range, the adhesive force may decrease with a decrease in cohesive force.
  • the weight average molecular weight is larger than the above range, the light control sheet of the present invention can be firmly bonded to the adherend, but the adhesive force is too high and it is difficult to peel off from the adherend when it is replaced.
  • the above weight average molecular weight is a value in terms of polystyrene as measured by gel permeation chromatography (GPC).
  • GPC gel permeation chromatography
  • three LF-804s manufactured by Showa Denko KK were used as the column material, and THF as the developing solvent. Shall be used.
  • the content ratio of the acrylate ester and the (meth) acryl monomer in the acrylic copolymer is not particularly limited as long as the acrylate ester is a main component, and the weather resistant adhesive layer in the present invention has a desired adhesive strength. It can be appropriately set so as to exhibit weather resistance and optical properties.
  • crosslinking agent is either a metal chelate crosslinking agent or an isocyanate type crosslinking agent.
  • Metal chelate crosslinking agent As the metal chelate crosslinking agent, those having a polyvalent metal such as aluminum, iron, copper, zinc, tin, titanium, nickel, antimony, magnesium, vanadium, chromium, zirconium as the central metal are preferable. Among these, an aluminum chelate cross-linking agent whose center metal is aluminum is particularly preferable.
  • aluminum chelate crosslinking agent examples include diisopropoxy aluminum monooleyl acetoacetate, monoisopropoxy aluminum bis oleyl acetoacetate, monoisopropoxy aluminum monooleate monoethyl acetoacetate, diisopropoxy aluminum monolauryl acetoacetate, diisopropoxy Aluminum monostearyl acetoacetate, diisopropoxy aluminum monoisostearyl acetoacetate, monoisopropoxy aluminum mono-N-lauroyl- ⁇ -alanate monolauryl acetoacetate, aluminum trisacetylacetonate, monoacetylacetonate aluminum bis (isobutylacetate Acetate) chelate, monoacetylacetonate aluminum bis (2 Ethylhexyl acetoacetate) chelate, monoacetylacetonate aluminum bis (dodecyl acetoacetate) chelate, monoacetylacetonate aluminum bis (oleyl acetoacetate
  • Examples of other metal chelate crosslinking agents include titanium tetrapropionate, titanium tetra-n-butyrate, titanium tetra-2-ethylhexanoate, zirconium-sec-butyrate, zirconium diethoxy-tert-butyrate, Examples include ethanolamine titanium dipropionate, ammonium lactate ammonium salt, and tetraoctylene glycol titanate.
  • the above metal chelate crosslinking agents may be used alone or in combination of two or more.
  • the polyisocyanate compound is not particularly limited, and 2,4-tolylene diisocyanate, 2,5-tolylene diisocyanate, 1,3-xylylene diisocyanate, 1,4-xylylene diisocyanate, diphenylmethane-4,4′- Examples thereof include diisocyanate, 3-methyldiphenylmethane diisocyanate, hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane-4,4′-diisocyanate, dicyclohexylmethane-2,4′-diisocyanate, and lysine isocyanate.
  • One of the above isocyanate-based crosslinking agents may be used alone, or two or more thereof may be used in combination.
  • the content of the cross-linking agent of the metal chelate cross-linking agent or isocyanate cross-linking agent is within the range of 1 to 30 parts by weight, especially 3 to 3 parts by weight with respect to 100 parts by weight of the acrylic copolymer. It is preferably in the range of 20 parts by mass, particularly in the range of 5 to 15 parts by mass.
  • the content of the above-mentioned crosslinking agent is more than the above range, the crosslinking reaction with the acrylic copolymer is excessively promoted and the curing becomes too dense, so that the weather-resistant adhesive layer is likely to deteriorate, The weather resistance as a light control sheet may fall. Moreover, there exists a possibility that a weather-resistant contact bonding layer may become cloudy.
  • the content of the cross-linking agent is less than the above range, the cross-linking reaction is not sufficiently performed and the curing becomes too sparse, so that the curing is insufficient and the adhesive force may be reduced.
  • the adhesive polymer is formed by crosslinking the above-mentioned acrylic copolymer and a crosslinking agent of a metal chelate crosslinking agent or an isocyanate-based crosslinking agent.
  • Other polymers may be included and these may be crosslinked.
  • the optional monomer include a hydroxyl group-containing (meth) acrylic monomer such as 2-hydroxypropyl acrylate.
  • the ultraviolet absorber contained in the weather-resistant adhesive layer has a predetermined optical characteristic, that is, a light transmittance of 60% or less at a wavelength of 380 nm.
  • a light transmittance of 60% or less at a wavelength of 380 nm.
  • the wavelength light that causes deterioration of the material constituting the light control layer the wavelength light that causes deterioration of iodine contained in the polarizing plate that constitutes the light control layer, because the transmittance is within the above-mentioned range. This is because selective and sufficient absorption can be achieved, and deterioration of the entire light control layer can be suppressed.
  • the transmittance of the above-mentioned wavelength light of the ultraviolet absorber is preferably 50% or less, and particularly preferably 30% or less.
  • the lower limit of the transmittance is preferably 5% or more.
  • the transmittance of the wavelength light of the ultraviolet absorber is larger than the above range, deterioration of the light control sheet due to ultraviolet rays may be promoted, and the weather resistance may not be improved.
  • the transmittance of the above-mentioned wavelength light of the ultraviolet absorber is lower than the above range, the weather-resistant adhesive layer becomes yellowish due to inhibition of visible light transmission near the wavelength of 380 nm, etc. In some cases, the light transmittance at the time may be reduced.
  • the light transmittance of the ultraviolet absorber refers to the ratio (%) of the light intensity at the time of emission to the light intensity at the time of incidence of light of each wavelength that passes through the ultraviolet absorber, and the concentration is 0.006 mass.
  • % Ultraviolet absorber solution solvent: toluene
  • a spectrophotometer UV-3150, manufactured by Shimadzu Corporation
  • the light transmittance with only the toluene solvent can be measured as a reference.
  • the weather-resistant adhesive layer cannot sufficiently absorb the light having a wavelength of 380 nm, which promotes the deterioration of iodine, particularly in the ultraviolet ray.
  • the optical layer may be easily deteriorated.
  • the content of the light stabilizer in the weather-resistant adhesive layer may be in the range of 0 to 7 parts by mass with respect to 100 parts by mass of the acrylic copolymer, and in particular in the range of 0 to 5 parts by mass. In particular, it is preferably in the range of 0 to 5 parts by mass.
  • the weather-resistant adhesive layer in the present invention may include an infrared reflector or an infrared absorber.
  • the said light control board When using the light control sheet of this invention for a light control board, the said light control board will be in a dark state by light transmission being shielded. At this time, it is necessary to increase the black density in the dark state in order to completely shield the light, and it is necessary to suppress the transmission of wavelength light in a wide range including not only the visible light region but also the infrared region. For this reason, it is preferable to suppress the transmission of infrared rays by adding an infrared reflecting agent or an infrared absorbing agent in the weather-resistant adhesive layer to reflect or absorb infrared rays.
  • Examples of the infrared reflecting agent include tin oxide, indium tin oxide, metal complex dye, and zinc oxide.
  • Examples of the infrared absorber include titanium oxide, zinc oxide, indium oxide, tin-doped indium oxide (ITO), tin oxide, antimony-doped tin oxide (ATO), and zinc sulfide metal oxide-based infrared absorber. It is done.
  • the kind of said infrared reflective agent and infrared absorber is an example, and is not limited to these materials.
  • the content of the infrared reflecting agent or the infrared absorbing agent in the weather-resistant adhesive layer is in the range of 0.1 to 20 parts by mass, especially 0.5 to 5 parts by mass with respect to 100 parts by mass of the acrylic copolymer. It is preferably in the range of 10 parts by mass, particularly in the range of 1 to 5 parts by mass.
  • the transparency of the light control sheet of the present invention may be reduced, and the light transmittance may be reduced.
  • sufficient black density may not be obtained and shielding may be insufficient.
  • the gel fraction of the weather-resistant adhesive layer in the present invention is preferably in a range having an adhesive force capable of bonding the adherend and the light control sheet at a desired thickness, and after curing. Is preferably in the range of 50% to 90%, more preferably in the range of 60% to 85%, and particularly preferably in the range of 70% to 80%.
  • the crosslink density becomes high, so that the adhesive strength is high and the light control sheet of the present invention can be firmly bonded to the adherend.
  • the force is too high to make it difficult to peel off the adherend during reattachment.
  • the crosslinking density is too high, the weather-resistant adhesive layer may be easily deteriorated.
  • the desired adhesive strength may not be exhibited because the crosslinking density is low.
  • the gel fraction is a value measured by the following method.
  • a weather-resistant adhesive layer sandwiched between the separators is cut out at 10 cm ⁇ 10 cm square.
  • the weight of the weathered adhesive layer that has been cut out is rolled and measured in a bottle, and the weight (initial weight) of the weatherable adhesive layer before treatment is measured from the difference between the weight of the separator and the bottle.
  • MEK a bottle that has been prevented from volatilizing and allowing it to stand for 3 hours
  • it is placed on a 100 cm net of 10 cm ⁇ 10 cm, which weighed in advance, and the waste liquid and The monomer eluted from the weather-resistant adhesive layer is discarded. Drying at 60 ° C.
  • the thickness of the weather-resistant adhesive layer may be any size as long as it can contain the above-described desired amount of the UV absorber, for example, in the range of 5 ⁇ m to 80 ⁇ m, in particular in the range of 10 ⁇ m to 60 ⁇ m, in particular 15 ⁇ m. It is preferably in the range of ⁇ 40 ⁇ m.
  • the thickness of the weather-resistant adhesive layer is larger than the above range, the light transmittance of the light control sheet may be deteriorated, the appearance may be deteriorated due to an increase in haze, and the bonding may be unfavorable.
  • the thickness of the weather-resistant adhesive layer is smaller than the above range, the desired amount of weathering agent cannot be included, or the desired adhesive strength cannot be obtained and the function as the light control sheet cannot be secured. There is.
  • the adhesive strength of the weather-resistant adhesive layer is preferably in the range of 4N / 25mm to 30N / 25mm, more preferably in the range of 4N / 25mm to 25N / 25mm, and particularly in the range of 4N / 25mm to 20N / 25mm.
  • the adhesive strength of the weather-resistant adhesive layer is within the above range, the light control sheet of the present invention can be stably bonded to the adherend, and when the light control sheet is peeled off, the adhesion is performed. This is because it can be peeled off without causing glue residue on the body.
  • the said adhesive force is the value measured by 180 degree peeling method (peeling speed 300mm / min) about the sample (adherence body: blue plate glass, 3mm thickness) of 25mm width by the method based on JISZ0237. is there.
  • the weather-resistant adhesive layer contains a UV absorber exhibiting predetermined optical characteristics, and thus can have high transparency without causing coloration due to the UV absorber.
  • the transmittance of the weather-resistant adhesive layer in the visible light region is preferably 70% or more, more preferably 80% or more, and particularly preferably 90% or more.
  • the transmittance can be measured according to JIS K7361-1 (a test method for the total light transmittance of plastic-transparent material).
  • the region where the polarization state or phase state of transmitted light is changed is a region where only linearly polarized light in a specific vibration direction is transmitted among light incident on the dimming layer, or linearly polarized light incident on the dimming layer is delayed.
  • the plurality of regions P1 to P11 having the same shape and the same width D and having different polarization states or phase states are changed in a stepwise manner. It can be set as the arrangement pattern formed continuously. At this time, the center-to-center distance between one region and the other region adjacent to the one region has a constant distance D corresponding to the width D of the region. 3 indicate the direction of factors that change the polarization state or phase state, such as the direction of the polarization axis and the direction of the in-plane slow axis in the phase difference region.
  • the width (interval) of each region in the light control layer is usually an equal interval, and is not particularly limited as long as the polarization state or phase state of transmitted light can be changed. It is preferably in the range of 5.0 cm, in particular in the range of 0.8 cm to 3.0 cm, particularly in the range of 1.0 cm to 1.5 cm.
  • the width of the region is smaller than the above range, the joints of the respective regions increase, and the light shielding plate provided with the light control sheet of the present invention may deteriorate the shielding property, but is larger than the above range.
  • the slide width becomes large, and it is necessary to increase the size of the light incident surface of the light control plate, so that the product appearance or operability may be deteriorated.
  • the width of the region refers to the length of the region in the short direction when the region is in a stripe shape. Other shapes can be defined by the length between the centers.
  • the layer configuration of the light control layer for example, an embodiment (first embodiment) having a pattern retardation layer and a polarizing plate disposed closer to the adhesive layer than the pattern retardation layer, the light is directly applied to the polarizing plate.
  • Examples include a mode (second mode) in which a region for changing a polarization state (hereinafter sometimes referred to as a polarization region) is formed in a pattern.
  • a mode second mode in which a region for changing a polarization state (hereinafter sometimes referred to as a polarization region) is formed in a pattern.
  • the light control layer of this aspect has a pattern phase difference layer and the polarizing plate arrange
  • the pattern retardation layer has a transparent film substrate, an alignment layer formed on the transparent film substrate, and a retardation layer formed on the alignment layer. It is preferable that two or more retardation regions different in at least one of the in-plane slow axis direction and the phase difference are formed in a constant shape with a constant interval. Since the light control layer has such a configuration, the light control plate including the light control sheet of the present invention can be easily designed as a slide mechanism, and the operation of the light control plate is facilitated. It is.
  • the retardation region in the retardation layer corresponds to the above-described pattern region in the light control layer. Further, in the above-mentioned retardation layer, two or more retardation regions different in at least one of the in-plane slow axis direction and the phase difference are “formed in a certain shape with a certain interval”. This phase difference region is synonymous with “consecutively formed with a constant width and a constant shape”.
  • FIG. 4 is a schematic cross-sectional view showing another example of the light control sheet.
  • the light control layer 2 of this aspect has the pattern phase difference layer 40 and the polarizing plate 50 arrange
  • the pattern retardation layer 40 is formed by laminating a transparent film substrate 33, an alignment layer 32, and a retardation layer 31 in at least this order, and the retardation layer 31 includes an in-plane slow axis direction and a retardation.
  • Two or more phase difference regions Q1 and Q2 that are different from each other are continuously formed with a constant width D and a constant shape.
  • the aspect of the phase difference layer 31 in FIGS. 4A and 4B will be described later.
  • the polarizing plate in this aspect is arrange
  • the polarizing plate is not particularly limited as long as the transmitted light can be linearly polarized light.
  • a polarizing plate generally used in a liquid crystal display device can be used.
  • Such a polarizing plate is not particularly limited as long as it contains at least a polarizer.
  • the polarizing plate is an embodiment comprising a polarizer and a polarizing plate protective film disposed on at least one surface of the polarizer.
  • the polarizer may be laminated or fixed on the pattern retardation layer to form a polarizing plate.
  • the polarizer is not particularly limited as long as the transmitted light can be linearly polarized light, but usually the polarizer contains iodine.
  • the polarizer contains iodine.
  • a polarizer in which a film made of polyvinyl alcohol is impregnated with iodine and uniaxially stretched to form a complex of polyvinyl alcohol and iodine.
  • the direction of the polarization axis in the polarizing plate is not particularly limited, and can be appropriately selected according to the orientation of the retardation region in the pattern retardation layer described later.
  • the polarizing plate protective film in the polarizing plate is not particularly limited as long as it can protect the polarizer and has a desired transparency, but particularly in the visible light region. Those having a transmittance of 80% or more are preferred, and those having a transmittance of 90% or more are more preferred.
  • the transmittance of the polarizing plate protective film can be measured according to JIS K7361-1 (plastic-transparent material total light transmittance test method).
  • Examples of the material constituting the polarizing plate protective film include cellulose derivatives, cycloolefin resins, polymethyl methacrylate, polyvinyl alcohol, polyimide, polyarylate, polyethylene terephthalate, polysulfone, polyethersulfone, amorphous polyolefin, acrylic resin, Examples thereof include modified acrylic polymers, polystyrene, epoxy resins, polycarbonates and polyesters. Among these, it is preferable to use a cellulose derivative, a cycloolefin resin, or an acrylic resin as the resin material.
  • cellulose derivative, the cycloolefin resin, and the acrylic resin as the material for the polarizing plate protective film include, for example, the material for the polarizing plate protective film described in JP 2012-198522 A. .
  • triacetyl cellulose (TAC) which is a cellulose derivative is preferable. This is because TAC is widely used as a polarizing plate protective film, but is easily deteriorated by ultraviolet rays, so that the effect of the present invention by using the above-mentioned weather-resistant adhesive layer is more exhibited.
  • the surface of the polarizing plate protective film may be subjected to surface treatment.
  • surface treatment for example, when triacetyl cellulose (TAC), which is a cellulose derivative, is used as a material for a polarizing plate protective film, adhesion to a polarizer containing polyvinyl alcohol can be improved by saponifying the surface.
  • TAC triacetyl cellulose
  • the direction of the in-plane slow axis of the retardation region is different, for example, as illustrated in FIG. 4A, the retardation region showing the same in-plane retardation value is constant. It is formed continuously with a width and a constant shape, and means that the direction of one in-plane slow axis and the direction of the other in-plane slow axis of adjacent phase difference regions are orthogonal to each other.
  • the arrow direction in each of the retardation regions Q1, Q2 of the retardation layer 31 indicates the direction of the in-plane slow axis.
  • the phase difference in the retardation region is different.
  • the retardation region indicating the same in-plane slow axis direction has a constant width and a constant width.
  • the phase difference value (in-plane retardation) corresponding to the film thickness difference is indicated by the difference in thickness for each phase difference region.
  • a thick retardation region may be referred to as a thick film region, and a small retardation region may be referred to as a thin film region.
  • the thick film region and the thin film region correspond to portions indicated by Q2 and Q1 in FIG.
  • the thickness of the thick film region and the thin film region is not particularly limited as long as the difference between the thick film region and the thin film region can be within a predetermined range.
  • the difference is 2.0 ⁇ m
  • the thickness of the thick film region is 13.0 ⁇ m and the thickness of the thin film region is May be 11.0 ⁇ m, and the difference may be 2.0 ⁇ m.
  • the thickness of the thick film region is preferably in the range of 1.6 ⁇ m to 20 ⁇ m, more preferably in the range of 2.5 ⁇ m to 10 ⁇ m, and particularly preferably in the range of 1.5 ⁇ m to 5 ⁇ m.
  • the thickness of the thin film region is preferably in the range of 0.1 ⁇ m to 17 ⁇ m, more preferably in the range of 1 ⁇ m to 7 ⁇ m, and particularly preferably in the range of 1 ⁇ m to 4 ⁇ m.
  • Retardation layer As a material for the retardation layer, a rod-like compound having refractive index anisotropy is preferable. This is because it can be regularly oriented and the retardation layer has a desired retardation. Among these, a liquid crystalline material exhibiting liquid crystallinity is preferable. This is because the liquid crystalline material has a large refractive index anisotropy, so that the retardation layer tends to have a desired retardation.
  • liquid crystalline material exhibiting the nematic phase a material having spacers at both mesogenic ends is preferable. This is because a liquid crystalline material having spacers at both ends of the mesogen has excellent flexibility and high transparency.
  • the rod-like compound is preferably one having a polymerizable functional group in the molecule, particularly one having a polymerizable functional group capable of three-dimensional crosslinking. This is because when the rod-shaped compound has a polymerizable functional group, the rod-shaped compound is polymerized and fixed, so that the retardation layer is excellent in alignment stability and hardly changes with time in retardation. When a rod-shaped compound having a polymerizable functional group is used, the retardation layer contains a rod-shaped compound crosslinked with a polymerizable functional group.
  • the “three-dimensional cross-linking” means that liquid crystal molecules are polymerized three-dimensionally to form a network (network) structure.
  • polymerizable functional group examples include polymerizable functional groups that are polymerized by irradiation with ionizing radiation such as ultraviolet rays and electron beams, or by heating.
  • Representative examples of these polymerizable functional groups include radical polymerizable functional groups and cationic polymerizable functional groups.
  • the polymerizable functional group can be the same as the polymerizable functional group in the rod-shaped compound described in JP 2012-137725 A.
  • the rod-like compound is a liquid crystalline material exhibiting liquid crystallinity, and the one having the polymerizable functional group at the terminal is particularly preferable. This is because the rod-shaped compound is three-dimensionally polymerized in the retardation layer to have a network structure, and has orientation stability and excellent optical characteristics. Even when a liquid crystalline material having a polymerizable functional group at one end is used, the alignment can be stabilized by crosslinking with other molecules.
  • rod-like compound examples include compounds described in JP2012-137725A.
  • said rod-shaped compound may use only 1 type, and may mix and use 2 or more types.
  • the orientation layer has a function of orienting the rod-shaped compound contained in the retardation layer when fixing the orientation state of the retardation region.
  • two or more regions are formed on the surface in a fixed shape with a fixed interval. That is, two or more alignment regions are continuously formed with a certain shape at a certain interval, and the retardation regions of the retardation layer are arranged at the same interval so as to correspond to the alignment region. , Allowing them to be arranged in shapes and patterns.
  • the material of the alignment layer is not particularly limited as long as the alignment region can be formed in a desired pattern in a desired shape.
  • a constituent material include a cured resin cured by irradiation with ionizing radiation such as heat or ultraviolet rays or electron beams.
  • the curable resin include an ultraviolet curable resin, a thermosetting resin, and an electron beam curable resin. Among these, an ultraviolet curable resin is preferable.
  • the ultraviolet curable resin before curing the ultraviolet curable resin include, for example, a polymerizable oligomer or monomer having an acryloyl group such as urethane acrylate, epoxy acrylate, polyester acrylate, polyether acrylate, melamine acrylate, acrylic acid, Examples include acrylamide, acrylonitrile, styrene and other polymerizable oligomers or monomers having a polymerizable vinyl group, which are added alone or in combination with a photopolymerization initiator and optional additives.
  • a polymerizable oligomer or monomer having an acryloyl group such as urethane acrylate, epoxy acrylate, polyester acrylate, polyether acrylate, melamine acrylate, acrylic acid
  • examples include acrylamide, acrylonitrile, styrene and other polymerizable oligomers or monomers having a polymerizable vinyl group, which are added alone or in combination with a photopolymerization
  • Each alignment region in the alignment layer has a corresponding relationship with each retardation region in the retardation layer.
  • the width of the alignment region can be the same as the width of the retardation region in the retardation layer.
  • the alignment region may have a fine uneven shape on the surface thereof. This is because, when forming the retardation region, the rod-shaped compound in the retardation layer provided on the alignment layer can be oriented in a certain direction due to the fine unevenness formed on the surface of each orientation region. For example, in the retardation layer, when it is desired to change the direction of the in-plane slow axis for each retardation region, the orientation direction of the rod-shaped compound changes by changing the longitudinal direction of the fine concavo-convex shape for each corresponding orientation region. The direction of the in-plane slow axis can be changed for each phase difference region. Note that the fine uneven shape formed on the surface of the alignment region can be the same as the fine uneven shape on the surface of the alignment region described in, for example, Japanese Patent Application Laid-Open No. 2012-137725.
  • the thickness of the alignment layer is not particularly limited as long as a desired alignment regulating force can be expressed in the retardation layer, and is preferably within a range of 0.01 ⁇ m to 1.0 ⁇ m, for example.
  • the thickness of the transparent film substrate is not particularly limited as long as it can support a desired retardation region without impairing light transmittance, but is usually in the range of 20 ⁇ m to 188 ⁇ m, and in particular, in the range of 30 ⁇ m to 90 ⁇ m. It is preferable to be within.
  • the transparent film substrate preferably has high transparency, and the transmittance in the visible light region is preferably 80% or more, particularly preferably 90% or more.
  • the transmittance in the visible light region of the transparent film substrate can be measured by JIS K7361-1 (Plastic—Testing method of total light transmittance of transparent material).
  • the said orientation layer consists of ultraviolet curable resin
  • the primer layer is not particularly limited as long as it has adhesiveness to both the transparent film substrate and the alignment layer, is visible optically transparent, and allows ultraviolet light to pass.
  • a vinyl chloride-vinyl acetate copolymer system A layer made of a urethane-based resin material can be used.
  • the pattern retardation layer has at least the transparent film substrate, the alignment layer, and the retardation layer, but may have other configurations as necessary.
  • the thickness of the pattern retardation layer is not particularly limited as long as the above-described function can be exhibited, and can be appropriately set according to the layer configuration.
  • having two or more regions that change the polarization state of transmitted light means having two or more regions having different polarization axis directions.
  • the light of one linearly polarized light component can be transmitted with high transmittance, and the light of the other linearly polarized light component that vibrates in the direction orthogonal to the one linearly polarized light component can be absorbed. Therefore, the polarizing plate in this embodiment does not need to be used in combination with the pattern retardation layer.
  • the light control sheet of this invention may have arbitrary members other than the above-mentioned member as needed.
  • arbitrary members assumed in the light control sheet of the present invention will be described.
  • the light control sheet of this invention has a peeling layer on a weather-resistant contact bonding layer.
  • the release layer it is possible to prevent adhesion of dust and the like to the weather-resistant adhesive layer until the light control sheet is bonded to the adherend, and to prevent the visibility of the light control sheet from being deteriorated due to dirt. .
  • the material of the release layer is not particularly limited as long as it is generally used.
  • examples thereof include acrylic and methacrylic resins such as polymethyl acrylate and polymethyl methacrylate, polyvinyl chloride resin, cellulose resin, silicon resin, chlorinated rubber, casein, various surfactants, and metal oxides. These materials may be used alone or in combination of two or more.
  • the light control sheet of the present invention may have an infrared reflecting layer or an infrared absorbing layer.
  • the reason for providing the infrared reflecting layer or the infrared absorbing layer, and the materials used for these layers the reason for adding the infrared reflecting agent or infrared absorbing agent described in the above-mentioned section of “1. Weather-resistant adhesive layer”, Since these can be the same as the examples of these materials, description thereof is omitted here.
  • the arrangement position of the infrared reflection layer or the infrared absorption layer is not particularly limited, but it is usually preferable to arrange the infrared reflection layer or the infrared absorption layer on the weather-resistant adhesive layer side of the light control layer.
  • an infrared reflective agent or an infrared absorber does not need to be contained in a weather-resistant contact bonding layer.
  • the thickness of the infrared reflecting layer or the infrared absorbing layer may be a thickness that does not impair the light transmittance of the light control sheet of the present invention and can exhibit the infrared reflecting function or the infrared absorbing function, for example, 0.1 ⁇ m. Within the range of ⁇ 10 ⁇ m, in particular within the range of 0.1 ⁇ m to 5 ⁇ m is preferable.
  • the light control sheet of the present invention may have a scratch-resistant layer, a self-cleaning layer, a light diffusion layer, an overcoat layer, a protective film, and the like as necessary.
  • the transmittance in the visible light region of the light control sheet of the present invention is preferably 20% or more, particularly preferably 30% or more.
  • the transmittance in the visible light region can be measured according to JIS K 7361-1 (plastic-transparent material total light transmittance test method).
  • the light control sheet of the present invention only needs to be used in such a manner that the weather-resistant adhesive layer is disposed on the light incident side (light source side) of the light control layer.
  • the weather-resistant adhesive layer is disposed on the light incident side (light source side) of the light control layer.
  • a window glass for a building, a vehicle, etc. Used for bonding to interiors and furniture.
  • the light control board of this invention has the 1st light control part which has a 1st light control sheet, and the 2nd light control part which has a 2nd light control sheet, The said 1st light control part and the said 2nd light control part
  • the light part is a light control plate arranged at an interval so that the first light control sheet and the second light control sheet face each other, wherein the first light control sheet and the second light control sheet Has at least an adhesive layer and a light control layer formed on the adhesive layer, and the light control layer has two or more regions that change the polarization state or phase state of transmitted light at regular intervals.
  • the adhesive layer of at least one of the first light control sheet and the second light control sheet is formed of a certain shape and is a crosslink of an acrylic copolymer and a metal chelate crosslinker or an isocyanate crosslinker.
  • Adhesive polymer that is cross-linked with an agent, and exhibits predetermined optical properties A weather-resistant adhesive layer containing an ultraviolet absorber, wherein at least one of the first dimming part and the second dimming part is movable in a plane direction intersecting with the region of the dimming layer. It is a feature.
  • the light control plate of this invention is demonstrated with reference to figures. 5A and 5B are a schematic side view and a top view of the light control plate of the present invention.
  • FIG. 5 illustrates a mode in which the first light control unit and the second light control unit have a light control sheet and a transparent substrate.
  • the light control plate 30 of the present invention includes a first light control unit 20A having a first transparent substrate 11A and a first light control sheet 10A, and a second light control unit having a second transparent substrate 11B and a second light control sheet 10B. 20B is arranged with a desired interval W so that the first light control sheet 10A and the second light control sheet 10B face each other.
  • the first light control sheet 10A has at least the adhesive layer 3A and the light control layer 2A formed on the adhesive layer 3A, and is bonded to the first transparent substrate 11A via the adhesive layer 3A.
  • the 2nd light control sheet 10B has at least the light control layer 2B formed on the contact bonding layer 3B and the contact bonding layer 3B, and is bonded with the 2nd transparent substrate 11B through the contact bonding layer 3B.
  • the light control layers 2A and 2B can be the same as the light control layer 2 described in FIG. In the example shown in FIG.
  • the light control sheet in at least one of the first light control unit and the second light control unit is the one described in the above “A.
  • Light control sheet the first light control unit and Among the second light control parts, the light control part having the light control sheet described in the section “A.
  • Light control sheet” is disposed on the light incident side, thereby causing deterioration of the material constituting the light control layer.
  • Wavelength light particularly wavelength light that causes deterioration of iodine contained in the polarizing plate constituting the light control layer, is selectively and sufficiently absorbed in the ultraviolet absorbent that exhibits the optical characteristics in the weather-resistant adhesive layer first. be able to.
  • the light control board of this invention can be made into a thing with durability and high weather resistance.
  • the light control plate of the present invention has the above-described effects by arranging the light control unit having the light control sheet described in the section “A. Light control sheet” on the light incident side according to the application. It is.
  • the light control unit having the light control sheet described in the section “A. Light control sheet” is disposed on the outdoor side. It is preferred that Outdoor light such as sunlight from the outside contains a lot of wavelength light that causes deterioration of the material constituting the light control layer, and in particular, ultraviolet light having a wavelength that causes deterioration of iodine contained in the polarizing plate constituting the light control layer.
  • the light-resistant adhesive layer By making the light incident on the weather-resistant adhesive layer before the light-modulating layer of each light-modulating part, the light-resistant adhesive layer sufficiently absorbs the wavelength light and prevents the wavelength light from entering the light-modulating part. Because it can be done.
  • the first light control unit and the second light control unit May have the light control sheet described in the section “A. Light control sheet”. Since both the first dimming part and the second dimming part have a weather-resistant adhesive layer, the weather-resistant adhesive layer can be used regardless of whether light enters from the first dimming part or the second dimming part. This is because it is possible to prevent deterioration of the light control section due to the above.
  • the 1st light control part in this invention has a 1st light control sheet at least.
  • the 2nd light control part in this invention has a 2nd light control sheet at least.
  • the 1st light control sheet and 2nd light control sheet in this invention have an adhesive layer and the light control layer formed on the said adhesive layer at least.
  • the adhesive layer of at least one of the first light control sheet and the second light control sheet is formed by crosslinking an acrylic copolymer and a metal chelate crosslinking agent or a crosslinking agent of an isocyanate crosslinking agent.
  • a weather-resistant adhesive layer comprising an adhesive polymer and an ultraviolet absorber having predetermined optical properties.
  • At least one of the adhesive layers may be a weather-resistant adhesive layer, and among them, both the first light control sheet and the second light control sheet have an adhesive layer.
  • a weather-resistant adhesive layer is preferred. That is, it is preferable that both the first light control sheet and the second light control sheet are the light control sheets described in the section “A. Light control sheet”.
  • the effect of the present invention is exhibited when the weather-resistant adhesive layer is disposed on the light incident side of the light control layer, so that both the first light control sheet and the second light control sheet are weather resistant. This is because the effect of the present invention can be exhibited regardless of which of the first dimming portion and the second dimming portion is disposed on the light incident side by using the adhesive layer.
  • the weather-resistant adhesive layer is the same as that described in the section “1. Weather-resistant adhesive layer” described above, and a description thereof will be omitted here.
  • one adhesive layer of the said 1st light control sheet and the 2nd light control sheet has a composition different from the above-mentioned weather resistant adhesive layer (henceforth a non-weather resistant adhesive layer may be called).
  • a non-weather resistant adhesive layer may be called.
  • the adhesive in the non-weather resistant adhesive layer general adhesives such as acrylic adhesives, silicon adhesives, ester adhesives, urethane adhesives, and the like can be used.
  • the non-weather resistant adhesive layer may include any material as necessary.
  • an infrared reflective agent or an infrared reflective agent is included as arbitrary materials. The reason and the infrared reflective agent or the type of the infrared reflective agent are the same as those described in the above-mentioned section “A. Light control sheet”, and thus the description thereof is omitted here.
  • the light control layer in the first light control sheet and the second light control sheet can be the same as the contents described in the section “A. Light control sheet”, and thus description thereof is omitted here. To do.
  • the light control layer in a 1st light control sheet and a 2nd light control sheet normally has the same pattern area
  • the first light control part in the present invention may be any one having at least a first light control sheet, but the first light control sheet is provided on one surface of the first transparent substrate. It is preferable that Similarly, the second light control section in the present invention is preferably provided with the second light control sheet on one surface of the second transparent substrate.
  • each light control part is provided with a transparent substrate in addition to the light control sheet, it is possible to improve the mechanical strength of each light control part, for example, when the light control plate of the present invention is arranged in a wide area. Because.
  • a 1st transparent substrate is arrange
  • a 2nd transparent substrate is arrange
  • the constituent materials of the first transparent substrate and the second transparent substrate are not particularly limited as long as they can support the first light control sheet and the second light control sheet and have high light transmittance.
  • inorganic materials such as glass, polyester resins such as polyethylene terephthalate, acrylic resins, and resin materials such as polycarbonate.
  • the light control plate of the present invention moves at least one of the first light control unit and the second light control unit in a plane direction intersecting the pattern region of the light control layer, and the pattern region in the first light control unit It is possible to change from the bright state to the dark state or vice versa by associating it with the pattern area in the dimmer unit.
  • “corresponding to the pattern region” means that the pattern of the region in the first dimming unit and the pattern of the region in the second dimming unit are overlapped with each other in plan view. Further, the mode of the intermediate state when changing from the bright state to the dark state or vice versa can be changed according to the pattern of each light control layer.
  • the light control plate of the present invention has a bright state and a dark state.
  • the state has an intermediate state that exists in stripes.
  • concentration of this invention is light-blocking density
  • a pattern, a picture, a character, etc. may be displayed according to the correspondence of the pattern area
  • moving in the direction of the plane intersecting the region means moving in a direction that intersects the pattern direction of the region and is parallel to the surface on which the region of the light control layer is formed. That is, it means moving in the surface direction in which the relative position of the pattern area of the first dimming unit and the pattern area of the second dimming unit changes.
  • the pattern region is a stripe shape, it refers to a direction (X direction in FIG. 5) that intersects the long direction of the stripe and is parallel to the surface of the light control layer on which the pattern region is formed.
  • the light control plate of the present invention as an interval between the first light control sheet and the second light control sheet, at least one of the first light control part and the second light control part can be moved in a desired direction.
  • the light control function can be exhibited.
  • it is preferably in the range of 0.01 mm to 5.0 mm, in particular in the range of 0.01 mm to 3.0 mm, particularly in the range of 0.01 mm to 0.5 mm. If the distance between the first light control sheet and the second light control sheet is larger than the above range, deflection may occur when light is transmitted through the light control plate of the present invention. If it is small, the first light control sheet and the second light control sheet may contact and wear.
  • the use of the light control plate of the present invention can be used for architectural windows, ceiling windows, daylighting windows such as terraces, roofs and side walls of greenhouses, partitions, interiors, furniture, automobile sunroofs, and the like.
  • a UV curable resin (Unidic manufactured by DIC Corporation) is applied on the copper plate, and a TAC film (triacetylcellulose, Fujitac manufactured by Fuji Film) is placed on the copper plate as a transparent film base, and UV rays are applied. Irradiated to cure.
  • the alignment layer was formed on the said TAC film base material by peeling a TAC film base material from a copper plate, and shaping uneven
  • a light release separator film having a low silicon transferability (product name: P381031, thickness 38 ⁇ m, manufactured by Lintec Corporation) was laminated on the weatherproof adhesive layer, and aged at 40 ° C. for 5 days to obtain a light control sheet.
  • Example 4 A light control sheet was obtained in the same manner as in Example 2, except that the ultraviolet absorber in the weather-resistant adhesive layer coating solution was a benzotriazole ultraviolet absorber (product name: Tinuvin 1130, manufactured by BASF).
  • the ultraviolet absorber in the weather-resistant adhesive layer coating solution was a benzotriazole ultraviolet absorber (product name: Tinuvin 1130, manufactured by BASF).
  • Example 1 A light control sheet was obtained in the same manner as in Example 2 except that the ultraviolet absorbent in the weather-resistant adhesive layer coating solution was a hydroxyphenyltriazine ultraviolet absorbent (product name: Tinuvin 479, manufactured by BASF).
  • the ultraviolet absorbent in the weather-resistant adhesive layer coating solution was a hydroxyphenyltriazine ultraviolet absorbent (product name: Tinuvin 479, manufactured by BASF).
  • Example 2 A light control sheet was obtained in the same manner as in Example 2 except that the ultraviolet absorber in the weather-resistant adhesive layer coating solution was a hydroxyphenyl triazine ultraviolet absorber (product name: Tinuvin 400, manufactured by BASF).
  • the ultraviolet absorber in the weather-resistant adhesive layer coating solution was a hydroxyphenyl triazine ultraviolet absorber (product name: Tinuvin 400, manufactured by BASF).
  • ⁇ Appearance evaluation> A color difference measurement was performed on each test piece after the UV resistance test.
  • a spectrophotometer manufactured by Shimadzu Corporation, model number: UV-3100PC
  • the ⁇ E * ab value was measured by a transmission method in accordance with JIS K7105.
  • a ⁇ E * ab value of less than 3 was marked with ⁇ , and a value of 3 or more was marked with ⁇ .
  • yellowing was not confirmed, indicating good weather resistance, and when the ⁇ E * ab value was 3 or more, yellowing at a level causing a practical problem was visually recognized.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Polarising Elements (AREA)
  • Laminated Bodies (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Mechanical Light Control Or Optical Switches (AREA)

Abstract

La présente invention a pour principal objectif de fournir une feuille et un panneau d'atténuation de lumière qui excellent en termes de résistance aux intempéries et de durabilité. La présente invention concerne une feuille d'atténuation de lumière caractérisée en ce qu'elle comprend une couche d'atténuation de lumière dans laquelle deux régions de forme identique ou plus qui changent la polarisation ou la phase de la lumière transmise sont formées à intervalles réguliers, et en ce qu'elle comprend une couche adhésive résistante aux intempéries déposée sur la surface de la couche d'atténuation et contenant les éléments suivants : un polymère adhésif obtenu par réticulation d'un copolymère acrylique et d'un agent de réticulation métal-chélate ou d'un agent de réticulation isocyanate ; et un absorbeur d'UV offrant un coefficient de transmission maximal de 60 % pour une lumière dont la longueur d'onde est de 380 nm.
PCT/JP2015/051308 2014-01-24 2015-01-20 Feuille et panneau d'atténuation de lumière WO2015111562A1 (fr)

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JP2017057629A (ja) * 2015-09-16 2017-03-23 大日本印刷株式会社 調光装置および調光装置の設置方法
JP2017187775A (ja) * 2016-04-05 2017-10-12 凸版印刷株式会社 調光シート
WO2018038260A1 (fr) * 2016-08-26 2018-03-01 大日本印刷株式会社 Dispositif de gradation et élément de gradation
JP2018031924A (ja) * 2016-08-25 2018-03-01 大日本印刷株式会社 調光装置
WO2018123722A1 (fr) * 2016-12-27 2018-07-05 富士フイルム株式会社 Élément d'affichage
JP2019045840A (ja) * 2018-03-14 2019-03-22 大日本印刷株式会社 調光装置
WO2019189010A1 (fr) * 2018-03-27 2019-10-03 積水化学工業株式会社 Corps de commande de lumière et carreau de commande de lumière

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JP2022009944A (ja) * 2017-03-03 2022-01-14 大日本印刷株式会社 車両
EP3843990A1 (fr) 2018-08-27 2021-07-07 Sika Technology AG Dispositif d'étanchéité auto-adhésif doté d'une couche adhésive
JP2023152161A (ja) * 2022-04-01 2023-10-16 株式会社ダイセル 粘着シート及びこれを用いた調光装置

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JP2008248131A (ja) * 2007-03-30 2008-10-16 Lintec Corp 日射遮蔽フィルム用粘着剤及び日射遮蔽フィルム
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Cited By (13)

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Publication number Priority date Publication date Assignee Title
JP2017057629A (ja) * 2015-09-16 2017-03-23 大日本印刷株式会社 調光装置および調光装置の設置方法
JP2017187775A (ja) * 2016-04-05 2017-10-12 凸版印刷株式会社 調光シート
JP6996104B2 (ja) 2016-04-05 2022-01-17 凸版印刷株式会社 調光シート
JP2018031924A (ja) * 2016-08-25 2018-03-01 大日本印刷株式会社 調光装置
WO2018038260A1 (fr) * 2016-08-26 2018-03-01 大日本印刷株式会社 Dispositif de gradation et élément de gradation
JP2018031972A (ja) * 2016-08-26 2018-03-01 大日本印刷株式会社 調光装置および調光部材
JPWO2018123722A1 (ja) * 2016-12-27 2019-10-31 富士フイルム株式会社 表示部材
WO2018123722A1 (fr) * 2016-12-27 2018-07-05 富士フイルム株式会社 Élément d'affichage
JP2019045840A (ja) * 2018-03-14 2019-03-22 大日本印刷株式会社 調光装置
CN111868578A (zh) * 2018-03-27 2020-10-30 积水化学工业株式会社 调光体和调光窗玻璃
JPWO2019189010A1 (ja) * 2018-03-27 2021-02-12 積水化学工業株式会社 調光体及び調光窓ガラス
WO2019189010A1 (fr) * 2018-03-27 2019-10-03 積水化学工業株式会社 Corps de commande de lumière et carreau de commande de lumière
JP7457504B2 (ja) 2018-03-27 2024-03-28 積水化学工業株式会社 調光体及び調光窓ガラス

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