JP2020086211A - Light control film, light control device - Google Patents
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- 229910000420 cerium oxide Inorganic materials 0.000 description 1
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- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
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- Liquid Crystal (AREA)
Abstract
Description
本発明は、液晶を用いた調光フィルムに関する。 The present invention relates to a light control film using liquid crystal.
調光フィルムは、一対の透明電極の間に液晶層を備え、透明電極に印加する電圧の変更によって液晶層中の液晶分子の配向する方向を変える。液晶分子の配向する方向が変化することにより、調光フィルムの透明度が変化する。調光フィルムの型式は、配向膜を有しないノーマルモードと、配向膜を有するリバースモードとに大別される。ノーマルモードは、駆動電圧の印加によって液晶層の透過率を上げ、駆動電圧の印加の停止によって液晶層の透過率を下げる。リバースモードは、駆動電圧の印加によって液晶層の透過率を下げ、駆動電圧の印加の停止によって液晶層の透過率を上げる（特許文献１，２参照）。 The light control film includes a liquid crystal layer between a pair of transparent electrodes, and changes the orientation direction of liquid crystal molecules in the liquid crystal layer by changing the voltage applied to the transparent electrodes. The transparency of the light control film changes as the orientation direction of the liquid crystal molecules changes. The type of light control film is roughly classified into a normal mode having no alignment film and a reverse mode having an alignment film. In the normal mode, the transmittance of the liquid crystal layer is increased by applying the driving voltage, and the transmittance of the liquid crystal layer is decreased by stopping the application of the driving voltage. In the reverse mode, the transmittance of the liquid crystal layer is reduced by applying a driving voltage, and the transmittance of the liquid crystal layer is increased by stopping the application of the driving voltage (see Patent Documents 1 and 2).
調光フィルムは、例えばガラス等の透明基材に固定することにより、窓ガラスや展示ウィンドウ、間仕切りなどに採用することが可能となる。機械的強度の付与のため、調光フィルムは、とくに合わせガラスの形態で使用されることが多い。合わせガラスの形態とは、調光フィルムを一対のガラス板で挟み、それぞれを中間膜で接着した形態である。 By fixing the light control film to a transparent base material such as glass, it becomes possible to use the light control film for a window glass, an exhibition window, a partition, or the like. Light control films are often used especially in the form of laminated glass for the purpose of imparting mechanical strength. The form of the laminated glass is a form in which the light control film is sandwiched between a pair of glass plates and each is bonded by an intermediate film.
調光フィルムの基材としては、ポリエチレンテレフタレート（ＰＥＴ）フィルムが一般的である。また、合わせガラスの中間膜にはＰＶＢ（ポリビニルブチラール）樹脂が多用されている。ＰＶＢは、ガラスとの接着性には優れるが、ＰＥＴなど樹脂との接着性は低いという問題がある。 A polyethylene terephthalate (PET) film is generally used as a base material of the light control film. Further, PVB (polyvinyl butyral) resin is often used for the interlayer film of the laminated glass. PVB has excellent adhesiveness to glass, but has a problem of low adhesiveness to resins such as PET.
本発明の目的は、中間膜としてＰＶＢを用いた合わせガラスに好適な調光フィルムを提供することにある。 An object of the present invention is to provide a light control film suitable for laminated glass using PVB as an intermediate film.
上記課題を解決するための本発明による調光フィルムは、第１の基材フィルムと、前記第１の基材フィルムの上に形成された第１の透明電極と、を有する第１の透明電極フィルムと、第２の基材フィルムと、前記第２の基材フィルムの上に形成された第２の透明電極と、を有する第２の透明電極フィルムと、前記第１の透明電極と前記第２の透明電極とを対向させて配置された前記第１の透明電極フィルムと前記第２の透明電極フィルムとの間に挟持された液晶層と、を備え、前記第１の基材フィルムおよび前記第２の基材フィルムの、表面自由エネルギーが５０ｍＮ／ｍ以上であることを特徴とする。 The light control film according to the present invention for solving the above-mentioned problems is a first transparent electrode having a first base film and a first transparent electrode formed on the first base film. A second transparent electrode film having a film, a second substrate film, and a second transparent electrode formed on the second substrate film; the first transparent electrode; And a liquid crystal layer sandwiched between the first transparent electrode film and the second transparent electrode film, which are arranged so as to face two transparent electrodes, and the first base film and the liquid crystal layer. The surface free energy of the second substrate film is 50 mN/m or more.
上記調光フィルムの、第１の基材フィルムおよび第２の基材フィルムに、ＰＥＴフィルムが用いられる。 PET films are used for the first base film and the second base film of the light control film.
上記調光フィルムの少なくとも片面に、接着性樹脂からなる中間膜を介して、調光フィルムよりも剛性が高く厚みの大きい透明板を積層一体化してなる調光装置としても良い。 A light control device may be formed by laminating and integrating a transparent plate having a higher rigidity and a larger thickness than that of the light control film on at least one surface of the light control film with an intermediate film made of an adhesive resin interposed therebetween.
上記調光装置において、調光フィルムと、中間膜との界面における、ＪＩＳ Ｋ ６８５０（１９９９）で規定される引張りせん断接着強さが５Ｎ／２５ｍｍ２以上であると良い。 In the light control device, the tensile shear adhesive strength defined by JIS K 6850 (1999) at the interface between the light control film and the intermediate film is preferably 5 N/25 mm 2 or more.
さらに中間膜がＰＶＢ樹脂を含む中間膜であると良い。 Furthermore, the intermediate film is preferably an intermediate film containing PVB resin.
本発明によれば、中間膜としてＰＶＢ樹脂を用いた合わせガラスに好適な調光フィルムを提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the light control film suitable for the laminated glass which used PVB resin as an intermediate film can be provided.
以下、本発明の実施形態について図を用いて説明するが、本発明は以下の説明によって限定されるものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following description.
＜調光フィルム＞
図１に示すように、調光フィルム１００は、一対の透明電極フィルム１５、１５と液晶層１３と、給電部１１０とを備える。各透明電極フィルム１５は、フィルム基材１１と透明電極１２とをこの順に備えた多層体である。一対の透明電極フィルム１５、１５は、各透明電極１２を液晶層１３と対向させ、液晶層１３を挟持する。
<Light control film>
As shown in FIG. 1, the light control film 100 includes a pair of transparent electrode films 15 and 15, a liquid crystal layer 13, and a power supply unit 110. Each transparent electrode film 15 is a multilayer body including a film substrate 11 and a transparent electrode 12 in this order. The pair of transparent electrode films 15 and 15 sandwich the liquid crystal layer 13 with the transparent electrodes 12 facing the liquid crystal layer 13.
フィルム基材１１は、ロール・トゥ・ロール（roll to roll）方式での製造に適した実質的に透明なフレキシブルフィルム基材であれば、いずれも用いることができる。本実施形態では、ポリエチレンテレフタレート（ＰＥＴ）を採用する。ＰＥＴフィルムには、紫外線吸収剤，安定剤などが添加されてあっても良い。 The film substrate 11 may be any substantially transparent flexible film substrate suitable for roll-to-roll manufacturing. In this embodiment, polyethylene terephthalate (PET) is used. An ultraviolet absorber, a stabilizer and the like may be added to the PET film.
フィルム基材１１は、液晶層１３と接する面とは反対側の面が５０ｍＮ／ｍ以上の表面自由エネルギーを有する。これに加えてフィルム基材１１の、液晶層１３と接する面の表面自由エネルギーが５０ｍＮ／ｍ以上であってもよい。表面自由エネルギーが５０ｍＮ／ｍ以上の面を有するフィルム基材は、例えば未処理のＰＥＴフィルムにコロナ処理やプラズマ処理などを施すことや、親水性ハードコート層を形成することによって作製される。 The film base material 11 has a surface free energy of 50 mN/m or more on the surface opposite to the surface in contact with the liquid crystal layer 13. In addition to this, the surface free energy of the surface of the film substrate 11 in contact with the liquid crystal layer 13 may be 50 mN/m or more. The film substrate having a surface having a surface free energy of 50 mN/m or more is produced, for example, by subjecting an untreated PET film to corona treatment or plasma treatment, or forming a hydrophilic hard coat layer.
透明電極１２は、従来公知の透明性を有する電極材料であればいずれも用いることができ、例えば、インジウム錫酸化物（ＩＴＯ）導電膜、酸化錫導電膜、酸化亜鉛導電膜、高分子導電膜などからなる電極である。透明電極１２は、真空蒸着法やスパッタリング法等の物理的気相成長法（ＰＶＤ法）、各種化学的気相成長法（ＣＶＤ法）、各種塗布法等を用いることにより形成することができる。また、透明電極１２のパターニングが必要な場合には、エッチング法、リフトオフ法、レーザトリミング法、各種マスクを用いる方法など、任意の方法によって透明電極１２のパターニングを行うことができる。 As the transparent electrode 12, any conventionally known transparent electrode material can be used, and for example, an indium tin oxide (ITO) conductive film, a tin oxide conductive film, a zinc oxide conductive film, a polymer conductive film can be used. It is an electrode composed of. The transparent electrode 12 can be formed by using a physical vapor deposition method (PVD method) such as a vacuum deposition method or a sputtering method, various chemical vapor deposition methods (CVD method), various coating methods, or the like. When the transparent electrode 12 needs to be patterned, the transparent electrode 12 can be patterned by any method such as an etching method, a lift-off method, a laser trimming method, and a method using various masks.
液晶層１３は、例えば、ポリマーネットワーク型液晶（ＰＮＬＣ）であり、液晶分子と、三次元の網目状に形成された樹脂からなるポリマーネットワークとを含み、ポリマーネットワークが有する空隙に液晶分子が保持されている。液晶層１３は、ポリマー分散型液晶（ＰＤＬＣ）など、他の構造であってもよい。 The liquid crystal layer 13 is, for example, a polymer network type liquid crystal (PNLC), contains liquid crystal molecules and a polymer network made of a resin formed in a three-dimensional network, and the liquid crystal molecules are held in the voids of the polymer network. ing. The liquid crystal layer 13 may have another structure such as polymer dispersed liquid crystal (PDLC).
液晶分子には、ネマチック液晶、スメクチック液晶、コレステリック液晶などの従来公知の液晶分子を用いることができる。中でも、低電圧での駆動ならびに散乱特性などを考慮すると、誘電率の異方性が高く、屈折率の異方性の大きいものが好ましい。液晶分子は
、ポリマーネットワークを形成する重合反応に供するエチレン基などの官能基を有していてもよい。
As the liquid crystal molecules, conventionally known liquid crystal molecules such as nematic liquid crystal, smectic liquid crystal and cholesteric liquid crystal can be used. Above all, in consideration of driving at low voltage, scattering characteristics, and the like, those having high anisotropy of dielectric constant and large anisotropy of refractive index are preferable. The liquid crystal molecule may have a functional group such as an ethylene group that is subjected to a polymerization reaction to form a polymer network.
液晶層１３は、ノーマルモードとリバースモードのいずれであってもよい。ノーマルモードの液晶層１３は、電圧印加（ＯＮ）により透過状態となり、電圧除去（ＯＦＦ）により散乱状態となる。リバースモードの液晶層１３は、電圧除去（ＯＦＦ）により透過状態となり、電圧印加（ＯＮ）により散乱状態となる。 The liquid crystal layer 13 may be in either a normal mode or a reverse mode. The normal mode liquid crystal layer 13 is in a transmissive state when a voltage is applied (ON), and is in a scattering state when a voltage is removed (OFF). The liquid crystal layer 13 in the reverse mode is in the transmissive state when the voltage is removed (OFF) and in the scattering state when the voltage is applied (ON).
調光フィルム１００にリバースモードの液晶層１３を用いる場合は、調光フィルム１００は各透明電極１２と液晶層１３との間に配向膜を有する。配向膜は、液晶層の配向方式（ＴＮ方式、ＶＡ方式、ＩＰＳ方式、ＯＣＢ方式など）に応じて、電圧除去（ＯＦＦ）時に透過状態を呈する分子配向となるものが選定され、従来公知の水平配向膜，垂直配向膜のいずれかの配向膜が用いられる。 When the reverse mode liquid crystal layer 13 is used for the light control film 100, the light control film 100 has an alignment film between each transparent electrode 12 and the liquid crystal layer 13. The alignment film is selected according to the alignment method of the liquid crystal layer (TN method, VA method, IPS method, OCB method, etc.), which becomes a molecular orientation that exhibits a transmissive state when the voltage is removed (OFF), and is a conventionally known horizontal film. Either an alignment film or a vertical alignment film is used.
リバースモードのＰＮＬＣによる液晶層１３を具備する調光フィルムの製造にあたっては、液晶と光重合性化合物（モノマー）との混合物を一対の透明電極フィルム１５（フィルム基材１１に透明電極１２、配向層（不図示）が積層されてなる）の間に挟む。次いで、一定の条件下で紫外線を照射することにより、光重合によって液晶中の光重合性化合物を高分子に変化させる。光重合および架橋結合により、微細なドメイン（高分子の空隙）を無数に有するポリマーネットワークが液晶中に形成される。一方、ノーマルモードの調光フィルムの製造にあたっては、フィルム基材１１に透明電極１２と配向層とが積層されてなる透明電極フィルム１５に代えて、フィルム基材１１に透明電極１２が積層されて配向層が積層されていない透明電極フィルム１５が用いられて、同様の手順によってなされる。 In the manufacture of the light control film including the liquid crystal layer 13 by PNLC in the reverse mode, a mixture of liquid crystal and a photopolymerizable compound (monomer) is used as a pair of transparent electrode films 15 (a transparent base material 12, a transparent electrode 12 and an alignment layer). (Not shown) is laminated). Then, the photopolymerizable compound in the liquid crystal is converted into a polymer by photopolymerization by irradiating with ultraviolet light under a certain condition. Due to photopolymerization and cross-linking, a polymer network having innumerable fine domains (voids of macromolecules) is formed in the liquid crystal. On the other hand, in the production of the normal mode light control film, the transparent electrode 12 is laminated on the film substrate 11 instead of the transparent electrode film 15 formed by laminating the transparent electrode 12 and the orientation layer on the film substrate 11. The transparent electrode film 15 on which the alignment layer is not laminated is used and the same procedure is performed.
液晶層１３には、スペーサが導入されてあっても良い。スペーサを導入することにより、液晶層１３の厚さを均一に保つことが可能となる。 Spacers may be introduced into the liquid crystal layer 13. By introducing the spacer, it becomes possible to keep the thickness of the liquid crystal layer 13 uniform.
スペーサとしては、特に限定するものではないが、粒状の樹脂スペーサや、粒状のガラススペーサなどを好適に用いることができる。 The spacer is not particularly limited, but a granular resin spacer, a granular glass spacer, or the like can be preferably used.
給電部１１０は、リード線を通じて外部からの給電を行なうために形成される。各給電部１１０は、例えば、ハーフカットにより透明電極１２を露出させ、露出した透明電極１２表面に導電ペースト、導電テープを積層し、導電テープ上にハンダを形成し、リード線に連結して形成される。 The power supply unit 110 is formed to supply power from the outside through the lead wire. Each power supply unit 110 is formed by exposing the transparent electrode 12 by, for example, half-cutting, laminating a conductive paste and a conductive tape on the exposed surface of the transparent electrode 12, forming solder on the conductive tape, and connecting the lead wire. To be done.
液晶層１３が第１状態（液晶分子が、調光フィルム１００が不透過を呈するように配列した状態）であるとき、液晶層１３の全光線透過率は、１０％以下であり、ヘイズ値は、８０％以上であることが好ましい。液晶層１３が第２状態（液晶分子が、調光フィルム１００が透過を呈するように配列した状態）であるとき、液晶層１３の全光線透過率は、８０％以上であり、ヘイズ値は、１０％以下であることが好ましい。なお、各層の全光線透過率は、ＪＩＳ Ｋ ７３６１−１（ＩＳＯ １３４６８−１）)に準拠する方法によって測定することができる。また、各層のヘイズ値は、ＪＩＳ Ｋ ７３６１（ＩＳＯ １４７８２）に準拠する方法によって測定することができる。 When the liquid crystal layer 13 is in the first state (the state in which the liquid crystal molecules are arranged so that the light control film 100 exhibits non-transmission), the total light transmittance of the liquid crystal layer 13 is 10% or less, and the haze value is , 80% or more is preferable. When the liquid crystal layer 13 is in the second state (the state in which the liquid crystal molecules are arranged so that the light control film 100 exhibits transmission), the total light transmittance of the liquid crystal layer 13 is 80% or more, and the haze value is It is preferably 10% or less. The total light transmittance of each layer can be measured by a method according to JIS K 7361-1 (ISO 13468-1). The haze value of each layer can be measured by a method according to JIS K7361 (ISO 14782).
調光フィルム１００の周縁部には、液晶層１３を水分、酸、紫外線などから守るためのシール部１４が塗布形成により設けられている。 A seal portion 14 for protecting the liquid crystal layer 13 from moisture, acid, ultraviolet rays and the like is provided by coating on the peripheral portion of the light control film 100.
シール部１４に用いられる材料としては、例えば、エポキシ系樹脂、ウレタン系樹脂、アクリル系樹脂、酢酸ビニル系樹脂、エン−チオール系樹脂、シリコーン系樹脂、変性ポ
リマーなどの硬化性樹脂を用いることができる。シール部１４に用いられる硬化性樹脂の硬化型は、熱硬化型、光硬化型、湿気硬化型、嫌気硬化型などのいずれでもよい。シール部１４は、色素やフィラー類などが添加されてあっても良い。添加される色素は、耐候性等を考慮すると、顔料系の色素が望ましい。
As a material used for the seal portion 14, for example, a curable resin such as an epoxy resin, a urethane resin, an acrylic resin, a vinyl acetate resin, an ene-thiol resin, a silicone resin, or a modified polymer is used. it can. The curable resin used for the seal portion 14 may be a thermosetting type, a photocuring type, a moisture curing type, an anaerobic curing type, or the like. The seal portion 14 may be added with a pigment or a filler. The pigment to be added is preferably a pigment-based pigment in consideration of weather resistance and the like.
シール部１４は、更に紫外線吸収剤を含み、紫外線遮蔽機能を有することが好ましい。シール部１４の膜厚を１５０μｍとした際に、波長３８０ｎｍの光（紫外線）の透過率が、０〜６０％の範囲であることが好ましい。これにより、調光フィルム１００の周縁部から紫外線が入射することによって液晶層１３が劣化するのを防ぐことができる。紫外線吸収剤は、従来公知のものから任意に選択して用いることができる。例えば、酸化チタン、酸化亜鉛、酸化セリウムなどの無機系紫外線吸収剤やベンゾトリアゾール系、トリアジン系、ベンゾフェノン系等の有機系紫外線吸収剤などを適宜選定し、単独あるいは２種以上の混合物として用いることができる。 It is preferable that the seal portion 14 further contains an ultraviolet absorber and has an ultraviolet shielding function. When the thickness of the seal portion 14 is 150 μm, the transmittance of light (ultraviolet rays) having a wavelength of 380 nm is preferably in the range of 0 to 60%. Accordingly, it is possible to prevent the liquid crystal layer 13 from being deteriorated due to the incidence of ultraviolet rays from the peripheral portion of the light control film 100. The ultraviolet absorber can be arbitrarily selected and used from conventionally known ones. For example, inorganic UV absorbers such as titanium oxide, zinc oxide and cerium oxide and organic UV absorbers such as benzotriazole, triazine and benzophenone are appropriately selected and used alone or as a mixture of two or more kinds. You can
調光フィルム１００は、パーテーションなど多くの用途においては、剛性を有する透明部材と粘着剤等により一体化された形態で用いられる。衝撃に対する耐性がとくに求められる用途においては、合わせガラス２００の形態で用いられる。合わせガラス２００の形態とは、一対のガラス板１５０、１５０の間に、調光フィルム１００が挟み込まれ、各ガラス板１５０と調光フィルム１００が中間膜１６０によって接着された形態である。中間膜１６０には、ポリビニルブチラール（ＰＶＢ）樹脂等のポリビニルアセタール樹脂を用いることができる。合わせガラス２００は、例えば、ガラス板１５０と中間膜１６０、調光フィルム１００、中間膜１６０、ガラス板１５０をこの順に積層して得た積層体を、真空バック中に入れ、減圧下で加熱して圧着する方法により製造される。 In many applications such as partitioning, the light control film 100 is used in the form of being integrated with a transparent member having rigidity by an adhesive or the like. It is used in the form of a laminated glass 200 in an application where impact resistance is particularly required. The form of the laminated glass 200 is a form in which the light control film 100 is sandwiched between a pair of glass plates 150, 150, and each glass plate 150 and the light control film 100 are adhered by the intermediate film 160. A polyvinyl acetal resin such as a polyvinyl butyral (PVB) resin can be used for the intermediate film 160. For the laminated glass 200, for example, a laminated body obtained by laminating the glass plate 150, the intermediate film 160, the light control film 100, the intermediate film 160, and the glass plate 150 in this order is placed in a vacuum bag and heated under reduced pressure. It is manufactured by a pressure bonding method.
フィルム基材として、一方の面にコロナ処理を施したＰＥＴフィルムを用意した。フィルム基材の、コロナ処理を施した面の表面自由エネルギーは、５０．１ｍＮ／ｍであった。フィルム基材の、コロナ処理を施した面とは反対の面に、透明電極を形成し、これを透明電極フィルムとした。この透明電極フィルムを２枚用いて、透明電極フィルム、液晶層、透明電極フィルムがこの順に重なった積層体を作製した。このとき各透明電極フィルムは、その透明電極が形成された面が液晶層と接するように配置された。この積層体を実施例１とした。 As the film substrate, a PET film having one surface subjected to corona treatment was prepared. The surface free energy of the corona-treated surface of the film substrate was 50.1 mN/m. A transparent electrode was formed on the surface of the film substrate opposite to the surface subjected to the corona treatment, and this was used as a transparent electrode film. Two transparent electrode films were used to prepare a laminate in which the transparent electrode film, the liquid crystal layer, and the transparent electrode film were stacked in this order. At this time, each transparent electrode film was arranged such that the surface on which the transparent electrode was formed was in contact with the liquid crystal layer. This laminated body was referred to as Example 1.
一方の面にコロナ処理を施したＰＥＴフィルムを、一方の面にプラズマ処理を施したＰＥＴフィルムと代えた以外は実施例１と同じ構成の積層体を実施例２とした。実施例２に用いたＰＥＴフィルムの、プラズマ処理を行った面の表面自由エネルギーは、５９．３ｍＮ／ｍであった。 Example 2 was a laminate having the same structure as in Example 1 except that the PET film having one surface subjected to corona treatment was replaced with the PET film having one surface subjected to plasma treatment. The surface free energy of the surface of the PET film used in Example 2 which was subjected to the plasma treatment was 59.3 mN/m.
一方の面にコロナ処理を施したＰＥＴフィルムを、一方の面に「親水・防曇性ハードコート剤ＬＡＦ２７００」（トーヨーケム株式会社製）による親水性ハードコート層を形成したＰＥＴフィルムと代えた以外は実施例１と同じ構成の積層体を実施例３とした。実施例３に用いたＰＥＴフィルムの、ハードコート層の表面自由エネルギーは、５７．１ｍＮ／ｍであった。 Except that the PET film having corona treatment on one side was replaced with the PET film having a hydrophilic hard coat layer formed by "hydrophilic/anti-fog hard coat agent LAF2700" (manufactured by Toyochem Co., Ltd.) on one side. A laminated body having the same configuration as that of Example 1 is referred to as Example 3. The surface free energy of the hard coat layer of the PET film used in Example 3 was 57.1 mN/m.
一方の面にコロナ処理を施したＰＥＴフィルムを、加工処理を施さない未処理のＰＥＴフィルムと代えた以外は実施例１と同じ構成の積層体を比較例とした。比較例に用いたＰＥＴフィルムの表面自由エネルギーは、４３．８ｍＮ／ｍであった。 A laminate having the same structure as in Example 1 was used as a comparative example except that the PET film having one surface subjected to the corona treatment was replaced with an untreated PET film which was not subjected to the treatment. The surface free energy of the PET film used in Comparative Example was 43.8 mN/m.
表面自由エネルギーは、水、ジヨードメタン、ヘキサデカンの３種の溶媒に対する接触角から求めた。接触角は、接触角計（ＣＡ−Ｘ型、協和界面科学株式会社製）を用い、Ｊ
ＩＳ Ｒ ３２５７に準拠する方法により測定した。
The surface free energy was calculated from the contact angles with respect to three kinds of solvents of water, diiodomethane and hexadecane. For the contact angle, a contact angle meter (CA-X type, manufactured by Kyowa Interface Science Co., Ltd.) was used.
It was measured by a method according to ISR 3257.
実施例１〜３および比較例の各積層体を、ポリビニルブチラール樹脂を含む中間膜を介して２枚のガラス板の間に挟み込み、合わせガラスの形態に加工した。各合わせガラスついて、ＰＶＢ樹脂との接着界面における接着強さの指標となるせん断剥離力を測定した。せん断剥離力は、引張試験機（ＥＺ−ＬＸ、島津製作所製）を用いて、ＪＩＳ Ｋ ６８５０（１９９９）に準拠する方法により測定した。 Each of the laminates of Examples 1 to 3 and Comparative Example was sandwiched between two glass plates via an interlayer film containing a polyvinyl butyral resin, and processed into a laminated glass form. For each laminated glass, the shear peeling force, which is an index of the adhesive strength at the adhesive interface with the PVB resin, was measured. The shear peeling force was measured by a method according to JIS K 6850 (1999) using a tensile tester (EZ-LX, manufactured by Shimadzu Corporation).
５Ｎ／２５ｍｍ以下の比較例は、ＰＥＴ基材と中間膜との界面におけるせん断剥離力（接着強さ）が５Ｎ／２５ｍｍ以下であった。一方、ＰＥＴ基材の表面自由エネルギーが５０ｍＮ／ｍ以上の実施例１〜３は、ＰＥＴ基材と中間膜との界面におけるせん断剥離力（接着強さ）が５Ｎ／２５ｍｍ以上であり、調光フィルムと中間膜との接着力が高いことが示された。 In the comparative example of 5 N/25 mm or less, the shear peeling force (adhesive strength) at the interface between the PET base material and the intermediate film was 5 N/25 mm or less. On the other hand, in Examples 1 to 3 in which the surface free energy of the PET base material is 50 mN/m or more, the shear peeling force (adhesive strength) at the interface between the PET base material and the interlayer film is 5 N/25 mm or more, and the dimming control is performed. It was shown that the adhesive force between the film and the intermediate film was high.
以上により、本発明による調光フィルムは、合わせガラスの形態に適している。 From the above, the light control film according to the present invention is suitable for the form of laminated glass.
１００ 調光フィルム
１５ 透明電極フィルム
１１ フィルム基材
１２ 透明電極
１３ 液晶層
１４ シール部
１１０ 給電部
２００ 合わせガラス
１５０ ガラス板
１６０ 中間膜
100 Light control film 15 Transparent electrode film 11 Film base material 12 Transparent electrode 13 Liquid crystal layer 14 Seal part 110 Power feeding part 200 Laminated glass 150 Glass plate 160 Intermediate film
Claims (5)
第２の基材フィルムと、前記第２の基材フィルムの上に形成された第２の透明電極と、を有する第２の透明電極フィルムと、
前記第１の透明電極と前記第２の透明電極とを対向させて配置された前記第１の透明電極フィルムと前記第２の透明電極フィルムとの間に挟持された液晶層と、を備え、
前記第１の基材フィルムおよび前記第２の基材フィルムの、表面自由エネルギーが５０ｍＮ／ｍ以上であることを特徴とする調光フィルム。 A first transparent electrode film having a first substrate film and a first transparent electrode formed on the first substrate film;
A second transparent electrode film having a second substrate film and a second transparent electrode formed on the second substrate film;
A liquid crystal layer sandwiched between the first transparent electrode film and the second transparent electrode film, the first transparent electrode film and the second transparent electrode being opposed to each other;
The light control film, wherein the surface free energy of the first base film and the second base film is 50 mN/m or more.
接着性樹脂からなる中間膜と、
前記調光フィルムよりも剛性が高く、かつ、厚さの大きい透明板と、をこの順に備えることを特徴とする調光装置。 At least one surface of the light control film according to claim 1 or 2,
An intermediate film made of adhesive resin,
A light control device comprising: a transparent plate having higher rigidity and a larger thickness than the light control film in this order.
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| JP2018168013A (en) * | 2017-03-29 | 2018-11-01 | 積水化学工業株式会社 | Interlayer for laminated glass, laminated glass, and method for producing interlayer for laminated glass |
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| JPH01186911A (en) * | 1988-01-21 | 1989-07-26 | Asahi Glass Co Ltd | Dimming device and its manufacture |
| JPH02120827A (en) * | 1988-10-31 | 1990-05-08 | Toyoda Gosei Co Ltd | Liquid crystal light control plate |
| JPH06500056A (en) * | 1990-08-20 | 1994-01-06 | モンサント・カンパニー | Laminate for safety glazing |
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