JP2021015219A - Light control device - Google Patents
Light control device Download PDFInfo
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- JP2021015219A JP2021015219A JP2019130160A JP2019130160A JP2021015219A JP 2021015219 A JP2021015219 A JP 2021015219A JP 2019130160 A JP2019130160 A JP 2019130160A JP 2019130160 A JP2019130160 A JP 2019130160A JP 2021015219 A JP2021015219 A JP 2021015219A
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Landscapes
- Liquid Crystal (AREA)
Abstract
Description
本発明は、液晶を用いた調光フィルムと調光デバイスに関する。 The present invention relates to a dimming film and a dimming device using a liquid crystal.
調光フィルムは、一対の透明電極の間に液晶材料を有する調光層（以後、液晶層と称する）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。（特許文献１，２参照）。 The light control film includes a light control layer (hereinafter referred to as a liquid crystal layer) having a liquid crystal material between a pair of transparent electrodes, and changes the voltage applied to the transparent electrodes to change the direction in which the liquid crystal molecules in the liquid crystal layer are oriented. Change. By changing the orientation direction of the liquid crystal molecules, the transparency of the light control film changes. (See Patent Documents 1 and 2).
フレキシブルな調光フィルムは、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、合わせガラスの形態で使用されることも多い。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、各ガラス板を中間膜で接着した形態である。 By fixing the flexible light control film to a transparent base material such as glass, it can be used for window glass, exhibition windows, partitions, and the like. The dimming film is often used in the form of laminated glass to impart mechanical strength. The form of laminated glass is a form in which a light control film is sandwiched between a pair of glass plates and each glass plate is bonded with an interlayer film.
一般に液晶材料は酸，水分，紫外線などによって劣化が生じやすい。そのため、調光フィルムと透明基材を接合する粘着層に紫外線カット機能を持たせて、透明基材を介して調光フィルムに入射する外光中の紫外成分から調光フィルムを保護することが想定される。例えば、粘着剤中に紫外線吸収剤を添加することにより、紫外線カット機能を発揮させることができる。 In general, liquid crystal materials are prone to deterioration due to acids, moisture, ultraviolet rays, and the like. Therefore, it is possible to provide the adhesive layer that joins the light control film and the transparent base material with an ultraviolet ray blocking function to protect the light control film from the ultraviolet components in the external light incident on the light control film via the transparent base material. is assumed. For example, by adding an ultraviolet absorber to the adhesive, the ultraviolet blocking function can be exhibited.
ここで、紫外線吸収機能を高めるために粘着剤に紫外線吸収剤の添加量を多く（目安として１０重量部を超える程度に）含有すると、粘着機能の低下を招くと共に、紫外線吸収剤の析出（ブリードアウト），しみ出し，べとつき，粘着層の不要な着色などの問題が生じる。また、適度な紫外線吸収剤の添加量の範囲で要求される紫外線吸収機能を確保しようとすると、粘着層自体が無駄に厚くなってしまい、コストアップおよび塗布形成の困難化（生産性の低下）を伴うと共に、調光デバイスの透光性の低下にも起因することとなる。 Here, if the adhesive contains a large amount of the ultraviolet absorber (to exceed 10 parts by weight as a guide) in order to enhance the ultraviolet absorbing function, the adhesive function is deteriorated and the ultraviolet absorber is precipitated (bleed). Out), exudation, stickiness, and unnecessary coloring of the adhesive layer occur. Further, if an attempt is made to secure the ultraviolet absorbing function required within the range of an appropriate amount of the ultraviolet absorber added, the adhesive layer itself becomes unnecessarily thick, resulting in an increase in cost and difficulty in coating formation (decrease in productivity). This is also due to a decrease in the translucency of the dimming device.
以上に鑑み、本発明は、ガラス等の透明基材に接合される調光体（粘着層を備える調光フィルム）であって、粘着機能を維持しつつも外光中の紫外成分による液晶の劣化を低減することができる調光体を提供することを目的とする。 In view of the above, the present invention is a dimming body (a dimming film having an adhesive layer) bonded to a transparent base material such as glass, which is a liquid crystal formed by an ultraviolet component in external light while maintaining an adhesive function. It is an object of the present invention to provide a dimmer capable of reducing deterioration.
本発明の一態様は、
入射する光の透過率を印加電圧に応じて変化させる液晶層と、
前記液晶層を挟持する一対の透明電極フィルムと、
前記一対の透明電極フィルムの少なくとも一方における前記液晶層とは反対側の面に設けられた粘着フィルムと、を有し、
前記粘着フィルムは、前記透明電極フィルム側から順に、第１粘着層、基材層、第２粘
着層を有し、かつ紫外域における最大透過率が１％以下である、
ことを特徴とする調光体である。
One aspect of the present invention is
A liquid crystal layer that changes the transmittance of incident light according to the applied voltage,
A pair of transparent electrode films that sandwich the liquid crystal layer,
At least one of the pair of transparent electrode films has an adhesive film provided on a surface opposite to the liquid crystal layer.
The adhesive film has a first adhesive layer, a base material layer, and a second adhesive layer in this order from the transparent electrode film side, and has a maximum transmittance of 1% or less in the ultraviolet region.
It is a dimming body characterized by this.
前記第１粘着層は前記透明電極フィルムに対する剥離強度が４Ｎ／２５ｍｍ以上であり、
前記第２粘着層は該第２粘着層に貼り付けられる基材に対する剥離強度が４Ｎ／２５ｍｍ以上である、
但し、前記剥離強度は、ＪＩＳ Ｚ ０２３７（２００９）により規定される、
ことが好適である。
The first adhesive layer has a peel strength of 4 N / 25 mm or more with respect to the transparent electrode film.
The second adhesive layer has a peel strength of 4 N / 25 mm or more with respect to the base material to be attached to the second adhesive layer.
However, the peel strength is defined by JIS Z 0237 (2009).
Is preferable.
前記粘着フィルムは、ヘイズが１０％以下であることが好適である。 The adhesive film preferably has a haze of 10% or less.
各粘着層のうち少なくとも前記第１粘着層は、厚さが７５μｍ以下であることが好適である。 Of the adhesive layers, at least the first adhesive layer preferably has a thickness of 75 μm or less.
前記基材層は、厚さが１５０μｍ以下で、かつヘイズが５％以下であることが好適である。 It is preferable that the base material layer has a thickness of 150 μm or less and a haze of 5% or less.
前記粘着フィルムを構成する各層の少なくとも何れか１つは、着色透光性を有していても良い。 At least one of the layers constituting the pressure-sensitive adhesive film may have colored translucency.
前記紫外域は、波長が２５０ｎｍ以上３９５ｎｍ以下である。 The ultraviolet region has a wavelength of 250 nm or more and 395 nm or less.
上記の調光体を用いた本発明の調光デバイスは、
基材と、
前記基材に前記第２粘着層を介して接合される上記の調光体と、
を有することを特徴とする。
The dimming device of the present invention using the above dimming body is
With the base material
With the above dimming body bonded to the base material via the second adhesive layer,
It is characterized by having.
前記基材は、少なくとも一部が曲面加工されているものであっても良い。 The base material may be at least partially curved.
本発明によれば、粘着フィルムに形成される複数の粘着層の紫外線吸収機能，厚さ，粘着強度を制御することで、調光フィルムと透明基材とを接合してなる各種態様の調光デバイスにおいて、外光中の紫外線による影響が抑制されて、信頼性に優れた調光デバイスが提供される。 According to the present invention, various modes of dimming formed by joining a dimming film and a transparent base material by controlling the ultraviolet absorption function, thickness, and adhesive strength of a plurality of adhesive layers formed on the adhesive film. In the device, the influence of ultraviolet rays in the outside light is suppressed, and a highly reliable dimming device is provided.
以下、図面を参照しながら本発明の実施形態について説明する。ここで、図面は模式的なものであり、説明の便宜上、平面寸法との関係や各層の厚みの比率等は実際の縮尺とは異なるサイズで誇張して図示する場合もある。また、以下に示す実施形態は、本発明の技術的思想を具体化するための構成を例示するものであって、本発明の技術的思想は、構成部品の材質、形状、構造等が下記のものに特定されるものではない。本発明の技術的思想は、特許請求の範囲に記載された請求項が規定する技術的範囲内において、種々の変更を加えることができる。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, the drawings are schematic, and for convenience of explanation, the relationship with the plane dimensions, the ratio of the thickness of each layer, and the like may be exaggerated to a size different from the actual scale. Further, the embodiments shown below exemplify a configuration for embodying the technical idea of the present invention, and the technical idea of the present invention describes the materials, shapes, structures, etc. of the constituent parts as follows. It is not specific to anything. The technical idea of the present invention may be modified in various ways within the technical scope specified by the claims stated in the claims.
＜調光フィルム＞
図２は調光フィルム１０の概略構成を示す説明図であり、（ａ）は全体の平面図、（ｂ）は給電電極２０近傍の構造例を示す断面図である。
<Light control film>
2A and 2B are explanatory views showing a schematic configuration of the light control film 10, FIG. 2A is a plan view of the entire light control film 10, and FIG. 2B is a cross-sectional view showing a structural example in the vicinity of the feeding electrode 20.
透明電極フィルム１５は、基材フィルム１１と透明電極１２との積層体である。透明電極フィルム１５の厚みは８０μｍ以上１５０μｍ以下が好ましい。透明電極フィルム１５を構成する基材フィルム１１は、ロール・トゥ・ロール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であれば、いずれも用いることができる。具体的には、ポリエチレンテレフタレート（ＰＥＴ），ポリエチレンナフタレート（ＰＥＮ）などのポリエステル系樹脂、ポリカーボネート樹脂，アクリル系樹脂，トリアセチルセルロース（ＴＡＣ）などのセルロース誘導体、ポリエーテルサルフォン（ＰＥＳ）樹脂，ポリイミド樹脂，ポリエチレンやポリプロピレンなどのポリオレフィン系樹脂などからなるフィルムを例示することができるが、必ずしもこれらに限定されるものではない。尚、同図においては、第１，第２の透明電極フィルム１５および構成部材である基材フィルム１１と透明電極１２については、互いに区別して説明が必要な場合には、便宜的に一方を第１，他方を第２と定義し、それぞれに符号ａ，ｂを添えて表示する。第１の透明電極フィルム１５ａおよび第２の透明電極フィルム１５ｂは各々透明電極１２ａ，１２ｂが積層された面を対向する状態で配置している。 The transparent electrode film 15 is a laminate of the base film 11 and the transparent electrode 12. The thickness of the transparent electrode film 15 is preferably 80 μm or more and 150 μm or less. As the base film 11 constituting the transparent electrode film 15, any substantially transparent flexible film suitable for production by the roll-to-roll method can be used. Specifically, polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polycarbonate resins, acrylic resins, cellulose derivatives such as triacetyl cellulose (TAC), polyether sulfone (PES) resins, Examples of films made of polyimide resins and polyolefin resins such as polyethylene and polypropylene can be exemplified, but are not necessarily limited thereto. In the figure, the first and second transparent electrode films 15 and the base film 11 and the transparent electrode 12 which are constituent members are shown in one for convenience when it is necessary to distinguish them from each other. 1. The other is defined as the second, and the symbols a and b are attached to each and displayed. The first transparent electrode film 15a and the second transparent electrode film 15b are arranged so that the surfaces on which the transparent electrodes 12a and 12b are laminated face each other.
基材フィルム１１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し、基材フィルムのいずれかの面に、紫外線吸収層，熱線反射層，バリア層などが設けられてあってもよい。また、基材フィルムには、適宜、易接着処理，帯電防止処理、などが施されてあっても良いし、更に補強基材などが設けられてあってもよい。 An ultraviolet absorber, a stabilizer, or the like may be added to the base film 11, and an ultraviolet absorbing layer, a heat ray reflecting layer, a barrier layer, or the like is provided on any surface of the base film. You may. Further, the base film may be appropriately subjected to an easy-adhesion treatment, an antistatic treatment, or the like, or may be further provided with a reinforcing base material or the like.
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る。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を用いることができるが、必ずしもこれらに限定されるものではない。この様な透明電極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される。 As the transparent electrode 12, any conventionally known electrode material having transparency can be used. For example, an electrode composed of an indium tin oxide (ITO) conductive film, a tin oxide conductive film, a zinc oxide conductive film, a polymer conductive film, or the like can be used, but the electrode is not necessarily limited thereto. Such a transparent electrode 12 is formed by using a physical vapor deposition method (PVD method) such as a vacuum vapor deposition method or a sputtering method, various chemical vapor deposition methods (CVD method), various coating methods, and the like. ..
一対の透明電極フィルム１５ａ、１５ｂの間に液晶層として機能する液晶層１３が挟持される。液晶層１３には、例えばポリマーネットワーク液晶（ＰＮＬＣ）や高分子分散液晶（ＰＤＬＣ）を用いることができる。以降は特にＰＮＬＣを採用した構成について説明する。液晶層１３の厚みは、５μｍ以上５０μｍ以下であり、特に１０μｍ以上２５μｍ以下が好適である。 A liquid crystal layer 13 that functions as a liquid crystal layer is sandwiched between the pair of transparent electrode films 15a and 15b. For the liquid crystal layer 13, for example, a polymer network liquid crystal (PNLC) or a polymer dispersed liquid crystal (PDLC) can be used. Hereinafter, a configuration using PNLC will be described in particular. The thickness of the liquid crystal layer 13 is 5 μm or more and 50 μm or less, and particularly preferably 10 μm or more and 25 μm or less.
調光フィルム１０の給電電極２０近傍では、一方の透明電極フィルム１５側から見て他方の透明電極フィルム１５の透明電極１２が露出した領域を有する。この領域には、調光フィルム１０を駆動するために電源から電力を供給するための給電電極２０が形成される。ＩＴＯや導電性ポリマー等からなる透明電極１２はハンダ付けを可能とする様に、その上に中継的役割を担う端子処理が必要となる。図２（ｂ）では、透明電極フィルム１５ａをハーフカットして液晶を除去することにより他方の透明電極フィルム１５ｂの透明電極１２ｂを露出させる。そして透明電極１２ｂの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。（同図では、導電ペースト，導電テープを単一部材として示している。）
調光フィルム１０の型式はノーマルモードとリバースモードの何れであっても良い。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。また、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。リバースモードの場合、各透明電極１２と液晶層１３との間に配向膜を要する。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，垂直配向膜の何れかの配向膜が用いられる。
In the vicinity of the feeding electrode 20 of the light control film 10, the transparent electrode 12 of the other transparent electrode film 15 has an exposed region when viewed from the one transparent electrode film 15 side. In this region, a feeding electrode 20 for supplying electric power from a power source for driving the light control film 10 is formed. The transparent electrode 12 made of ITO, a conductive polymer, or the like requires terminal treatment that plays a relay role on the transparent electrode 12 so that it can be soldered. In FIG. 2B, the transparent electrode 12b of the other transparent electrode film 15b is exposed by half-cutting the transparent electrode film 15a to remove the liquid crystal. Then, the conductive paste and the conductive tape are laminated on the surface of the transparent electrode 12b, solder is formed on the conductive tape, and the solder is connected to the lead wire. (In the figure, the conductive paste and the conductive tape are shown as a single member.)
The model of the light control film 10 may be either a normal mode or a reverse mode. The liquid crystal layer 13 in the normal mode is in a transmissive state when a voltage is applied (ON), and is in a scattered state when the voltage is removed (OFF). Further, the liquid crystal layer 13 in the reverse mode is put into a transmission state by removing the voltage (OFF), and is put into a scattering state by applying a voltage (ON). In the reverse mode, an alignment film is required between each transparent electrode 12 and the liquid crystal layer 13. The alignment film is selected to have a molecular orientation that exhibits a transmission state when the voltage is removed (OFF) according to the alignment method (TN method, VA method, IPS method, OCB method, etc.) of the liquid crystal layer, and is conventionally known horizontal orientation. Either a film or a vertical alignment film is used.
ＰＮＬＣによる液晶層１３を具備する調光フィルム１０の製造にあたっては、まず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。ノーマルモードの調光フィルム１０を製造する場合には、透明電極フィルム１５としては、基材フィルム１１に透明電極１２が成膜されてなる構成のものを採用し、リバースモードの場合には、基材フィルム１１に透明電極１２および配向膜（図示せず）が成膜されてなる構成のものを採用する。 In the production of the light control film 10 provided with the liquid crystal layer 13 by PNLC, first, a mixture of the liquid crystal and the photopolymerizable compound (monomer) is sandwiched between the pair of transparent electrode films 15. Then, by irradiating with ultraviolet rays under certain conditions, the photopolymerizable compound in the liquid crystal is changed into a polymer by photopolymerization. By photopolymerization and cross-linking, a polymer network having innumerable fine domains (polymer voids) is formed in the liquid crystal. When manufacturing the light control film 10 in the normal mode, the transparent electrode film 15 adopts a structure in which the transparent electrode 12 is formed on the base film 11, and in the case of the reverse mode, the base film 15 is formed. A material film 11 having a transparent electrode 12 and an alignment film (not shown) formed on the material film 11 is adopted.
＜粘着フィルム＞
本発明は、図３に示すように調光フィルム１０と透明基材３０を接合してなる調光デバイス１００において、接合に用いる粘着層は単層の粘着剤ではない。すなわち、本発明の粘着フィルム４０は粘着層４２と基材層４１とを交互に積層し、かつ最外面が粘着層４２となる３層以上の積層構成である。さらに粘着層４２に紫外線吸収機能を備える。粘着層４２間に基材層４１を挟むことで粘着層４２自体の膜厚が厚くなることを抑止できる。
<Adhesive film>
According to the present invention, in the light control device 100 formed by bonding the light control film 10 and the transparent base material 30 as shown in FIG. 3, the pressure-sensitive adhesive layer used for bonding is not a single-layer pressure-sensitive adhesive. That is, the pressure-sensitive adhesive film 40 of the present invention has a laminated structure of three or more layers in which the pressure-sensitive adhesive layer 42 and the base material layer 41 are alternately laminated and the outermost surface is the pressure-sensitive adhesive layer 42. Further, the adhesive layer 42 is provided with an ultraviolet absorbing function. By sandwiching the base material layer 41 between the adhesive layers 42, it is possible to prevent the adhesive layer 42 itself from becoming thicker.
図１は、本発明で用いられる粘着フィルム４０の構成例を示す断面図である。 FIG. 1 is a cross-sectional view showing a configuration example of the pressure-sensitive adhesive film 40 used in the present invention.
粘着フィルム４０の基本的構成は、基材層４１と、基材層４１の両面に形成された第１粘着層４２ａおよび第２粘着層４２ｂを有し、図１（ａ）に示すように３層構成である。 The basic structure of the pressure-sensitive adhesive film 40 includes a base material layer 41, a first pressure-sensitive adhesive layer 42a and a second pressure-sensitive adhesive layer 42b formed on both sides of the base material layer 41, and as shown in FIG. 1A, 3 It has a layered structure.
第１粘着層４２ａは、調光フィルム１０と透明基材３０との接合にあたり、調光フィルム１０側に配置される粘着層であり、第２粘着層４２ｂは透明基材３０側に配置される粘着層である。 The first adhesive layer 42a is an adhesive layer arranged on the light control film 10 side when the light control film 10 and the transparent base material 30 are bonded, and the second adhesive layer 42b is arranged on the transparent base material 30 side. It is an adhesive layer.
図１（ｂ）はさらに多層化した場合の粘着フィルム４０の構成に係る図示である。基材フィルムが４１ａ，４１ｂの２枚となり、それらを接合する新たな粘着層４２ｃが介在した全体として５層構成（粘着層は３層）となる。さらに多層化する場合は、基材層および粘着層が交互に積層される構成要素として増え、例えば全体として７層構成（粘着層は４層）としても良い。粘着層数を増やし、それぞれの粘着層に紫外線吸収機能を付加することにより、最外面で別部材との接合に寄与する第１粘着層４２ａおよび第２粘着層４２ｂの粘着力を低下させずに、粘着フィルム４０全体の紫外線吸収機能を向上することが可能となる。 FIG. 1B is a diagram relating to the configuration of the adhesive film 40 when the number of layers is further increased. There are two base films, 41a and 41b, and a new adhesive layer 42c that joins them is interposed to form a five-layer structure (the adhesive layer is three layers). In the case of further multi-layering, the number of constituent elements in which the base material layer and the adhesive layer are alternately laminated is increased, and for example, a 7-layer structure (adhesive layer is 4 layers) may be formed as a whole. By increasing the number of adhesive layers and adding an ultraviolet absorbing function to each adhesive layer, the adhesive strength of the first adhesive layer 42a and the second adhesive layer 42b, which contribute to bonding with another member on the outermost surface, is not reduced. , It is possible to improve the ultraviolet absorbing function of the entire adhesive film 40.
また、構成要素として増える基材フィルムにも、紫外線吸収機能，バリア機能，着色透光性など各種機能を付加することも併用しうるが、粘着フィルム４０のコストアップ，製造の煩雑化などを考慮して、実用的な範囲での多層構成の採用が望まれる。また、粘着層４２ａ，４２ｂはそれぞれが単一組成の単層構成でなく、組成の異なる層が厚さ方向あるいは面内方向で近接配置される構成であっても良い。 In addition, it is possible to add various functions such as an ultraviolet absorption function, a barrier function, and colored translucency to the base film, which is increasing as a component, in consideration of cost increase of the adhesive film 40 and complicated manufacturing. Therefore, it is desired to adopt a multi-layer structure within a practical range. Further, the adhesive layers 42a and 42b may not each have a single-layer structure having a single composition, but may have a structure in which layers having different compositions are arranged close to each other in the thickness direction or the in-plane direction.
粘着フィルム４０を構成する第１粘着層４２ａ，第２粘着層４２ｂ，第３粘着層４２ｃは、同一組成，同一厚さであっても良いし、あるいは、接合対象，部位に応じて異なる組成，厚さであっても良い。 The first adhesive layer 42a, the second adhesive layer 42b, and the third adhesive layer 42c constituting the adhesive film 40 may have the same composition and the same thickness, or may have different compositions depending on the bonding target and the site. It may be thick.
粘着フィルム４０を構成する基材層４１ａ，４１ｂとしては、ポリエチレンテレフタレート（ＰＥＴ），ポリエチレンナフタレート（ＰＥＮ）などのポリエステル系樹脂、ポリカーボネート樹脂，アクリル系樹脂，トリアセチルセルロース（ＴＡＣ）などのセルロース誘導体、ポリエーテルサルフォン（ＰＥＳ）樹脂，ポリイミド樹脂，ポリエチレンやポリプロピレンなどのポリオレフィン系樹脂などからなるフィルムを例示することができる。基材層４１ａ，４１ｂも塗布形成される粘着層に応じて適宜に変更しうる。また、基材層４１ａ，４１ｂにも紫外線吸収剤，安定剤などが添加されてあっても良いし、いずれかの面に、紫外線吸収層，熱線反射層，バリア層などが設けられてあっても良い。基材層４１は、厚さが１５０μｍ以下で、かつヘイズが５％以下であることが好適である。 The base material layers 41a and 41b constituting the adhesive film 40 include polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), and cellulose derivatives such as polycarbonate resins, acrylic resins, and triacetyl cellulose (TAC). , Polyethersulfon (PES) resin, polyimide resin, polyolefin resin such as polyethylene and polypropylene, and the like can be exemplified. The base material layers 41a and 41b can also be appropriately changed depending on the adhesive layer formed by coating. Further, an ultraviolet absorber, a stabilizer, or the like may be added to the base material layers 41a and 41b, and an ultraviolet absorbing layer, a heat ray reflecting layer, a barrier layer, and the like are provided on either surface. Is also good. It is preferable that the base material layer 41 has a thickness of 150 μm or less and a haze of 5% or less.
粘着フィルム４０は、外光中に含まれる紫外線から調光フィルム１０を保護する紫外線カット機能または紫外線吸収機能を備える。本実施形態では、２５０ｎｍ以上３９５ｎｍ以下の波長が粘着フィルム４０を透過するときの最大透過率が１％以下である。 The adhesive film 40 has an ultraviolet blocking function or an ultraviolet absorbing function that protects the dimming film 10 from ultraviolet rays contained in external light. In the present embodiment, the maximum transmittance when a wavelength of 250 nm or more and 395 nm or less passes through the adhesive film 40 is 1% or less.
粘着フィルム４０の一方の表面（第１粘着層４２ａ側）は調光フィルム１０（透明電極フィルム１５ａ，１５ｂの何れかの表面）に接合し、他方の表面（第２粘着層４２ｂ側）は透明基材に接合する。何れの接合面においても、粘着力と紫外線吸収機能を両立するために、粘着層４２ａ，４２ｂに添加する紫外線吸収剤の添加量は粘着強度の指標として、ＪＩＳ Ｚ ０２３７（２００９）で規定される剥離強度が４Ｎ／２５ｍｍ以上となるように添加することが好ましい。さらに、本発明の粘着フィルム４０を建築窓ガラス用フィルムとして使用する際には、ＪＩＳ Ａ ５７５９（２０１６）に準拠する粘着力が、日射調整フィルムで２Ｎ／２５ｍｍ以上，飛散防止フィルムで４Ｎ／２５ｍｍ以上とすることが好ましい。 One surface (first adhesive layer 42a side) of the adhesive film 40 is bonded to the light control film 10 (one of the transparent electrode films 15a and 15b), and the other surface (second adhesive layer 42b side) is transparent. Join to the substrate. The amount of the ultraviolet absorber added to the adhesive layers 42a and 42b is specified in JIS Z 0237 (2009) as an index of the adhesive strength in order to achieve both the adhesive strength and the ultraviolet absorbing function on any of the joint surfaces. It is preferable to add it so that the peel strength is 4 N / 25 mm or more. Further, when the adhesive film 40 of the present invention is used as a film for building window glass, the adhesive strength conforming to JIS A 5759 (2016) is 2N / 25mm or more for the solar radiation adjusting film and 4N / 25mm for the shatterproof film. The above is preferable.
粘着フィルム４０は、単体でのヘイズが１０％以下であることが好適である。粘着フィルム４０単体のヘイズが１０％を超えてしまうと、調光フィルム１０を透明状態にしている場合であっても不透明感が残存してしまい好ましくない。 The adhesive film 40 preferably has a haze of 10% or less by itself. If the haze of the adhesive film 40 alone exceeds 10%, opacity remains even when the light control film 10 is in a transparent state, which is not preferable.
粘着フィルム４０を構成する粘着層（４２ａ，４２ｂ，４２ｃ）は、単体での厚さが７５μｍ以下であることが好適である。粘着層の厚さが７５μｍを超えてしまうと、粘着層の塗工時において、溶剤が蒸発するまでの時間を含めたラインスピードが低下し、製造効率の低下に影響する。加えて、粘着層の厚さの増大は、調光デバイスの撓みに対する許容性が低くなり、製造、施工時の取扱いが難しくなるため好ましくない。一方、粘着層が薄過ぎるとクッションとしての役割を適切に果たすことが難しくなる。そのため、調光フィルム１０を粘着フィルム４０により曲率を有する対象に適用する場合には、粘着層４２の厚さは適切な範囲に設定する必要がある。 The pressure-sensitive adhesive layers (42a, 42b, 42c) constituting the pressure-sensitive adhesive film 40 preferably have a thickness of 75 μm or less by themselves. If the thickness of the adhesive layer exceeds 75 μm, the line speed including the time until the solvent evaporates decreases when the adhesive layer is applied, which affects the decrease in manufacturing efficiency. In addition, an increase in the thickness of the adhesive layer is not preferable because the tolerance for bending of the dimming device becomes low and handling during manufacturing and construction becomes difficult. On the other hand, if the adhesive layer is too thin, it becomes difficult to properly serve as a cushion. Therefore, when the light control film 10 is applied to an object having a curvature by the adhesive film 40, the thickness of the adhesive layer 42 needs to be set in an appropriate range.
粘着フィルム４０を構成する基材層４１と粘着層４２の少なくとも何れかを着色透光性とすることにより、粘着フィルム４０全体としても着色透光性としても良い。 By making at least one of the base material layer 41 and the pressure-sensitive adhesive layer 42 constituting the pressure-sensitive adhesive film 40 colored and translucent, the pressure-sensitive adhesive film 40 as a whole may be colored and translucent.
粘着層４２に添加する紫外線吸収剤は、ベンゾフェノン系、ベンゾトリアゾール系またはサリチル酸フェニル系の材料からなっていることが好ましく、具体的には、２，４−ジヒドロキシ−ベンゾフェノン、２−ヒドロキシ−４−メトキシベンゾフェノン、４−ドデシロキシ−２−ヒドロキシベンゾフェノン、２−ヒドロキシ−４−メトキシ−５−スルフォベンゾフェノン、２（２’ヒドロキシ−５−メチルフェニル）ベンゾトリアゾール、２（２’−ヒドロキシ−３’，５’ジターシャルブチル）ベンゾトリアゾール、フェニルサリシレイト、ｐ−オクチルフェニルサリシレイト、ｐ−ターシャルブチルフェニルサリシレートからなる群より選ばれる１以上の化合物からなっていることが好ましい。 The ultraviolet absorber added to the adhesive layer 42 is preferably made of a benzophenone-based, benzotriazole-based or phenyl salicylate-based material, and specifically, 2,4-dihydroxy-benzophenone and 2-hydroxy-4- Methoxybenzophenone, 4-dodecyloxy-2-hydroxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, 2 (2'hydroxy-5-methylphenyl) benzotriazole, 2 (2'-hydroxy-3', It is preferably composed of one or more compounds selected from the group consisting of 5'dital butyl) benzotriazole, phenyl salicylate, p-octyl phenyl salicylate, and p-talshal butyl phenyl salicylate.
紫外線吸収剤は、５０〜３９５ｎｍに最大透過率が１％以下となるような吸収波長領域を持つことが望ましい。紫外線吸収剤の添加量は、０．０５〜１０重量部、望ましくは０．１〜８重量部がよい。０．０５重量部未満では紫外線吸収量が小さいので添加した効果が小さい。１０重量部を超えると紫外線吸収剤の析出（ブリードアウト）、しみ出し、べとつき、フィルムの着色などの問題が生じる。 It is desirable that the ultraviolet absorber has an absorption wavelength region in which the maximum transmittance is 1% or less at 50 to 395 nm. The amount of the ultraviolet absorber added is preferably 0.05 to 10 parts by weight, preferably 0.1 to 8 parts by weight. If it is less than 0.05 parts by weight, the amount of ultraviolet rays absorbed is small, so the effect of addition is small. If it exceeds 10 parts by weight, problems such as precipitation (bleed-out) of the ultraviolet absorber, exudation, stickiness, and coloring of the film occur.
粘着層４２を構成する粘着剤としては、天然ゴム、合成ゴムに代表されるゴム系粘着剤、エチルアクリレート、オクチルアクリレートに代表されるアクリル系粘着剤、メチルフェニルポリシロキサン樹脂、フェニルビニルシロキサン樹脂に代表されるシリコーン系粘着剤、酢酸ビニル、ラウリル酸ビニルに代表されるビニル系粘着剤などが好ましく用いられる。 The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 42 includes natural rubber, rubber-based pressure-sensitive adhesives typified by synthetic rubber, ethyl acrylates, acrylic pressure-sensitive adhesives typified by octyl acrylate, methylphenylpolysiloxane resin, and phenylvinylsiloxane resin. Typical silicone-based pressure-sensitive adhesives, vinyl acetate, vinyl-based pressure-sensitive adhesives typified by vinyl laurate, and the like are preferably used.
剛性の十分な透明基材３０に、フレキシブルで撓みやすい調光フィルム１０を、図１に示す粘着フィルム４０により接合して全体としてリジッドな調光デバイスとする。図３（ａ）は合わせガラスと同様に、２枚の透明基材３０で調光フィルム１０を挟み込んで用いる形態であり、図３（ｂ）は１枚の透明基材３０のみで調光フィルム１０を支持して用いる形態である。 A flexible and easily flexible dimming film 10 is joined to a transparent base material 30 having sufficient rigidity by the adhesive film 40 shown in FIG. 1 to form a rigid dimming device as a whole. FIG. 3A shows a form in which the light control film 10 is sandwiched between two transparent base materials 30 as in the case of laminated glass, and FIG. 3B shows a light control film using only one transparent base material 30. It is a form in which 10 is supported and used.
（実施例１）
図１（ａ）は、実施例１の粘着フィルム４０を示す。実施例１の粘着フィルムは、厚さ３８μｍ，ヘイズ０．８％のＰＥＴ製の基材層４１を使用している。基材層４１の両面には第１粘着層と第２粘着層が形成される。各粘着層はＵＶＡ（紫外線吸収剤）が添加された粘着剤を膜厚５０μｍで塗布することにより形成される。粘着フィルム４０の第１粘着層側で調光フィルム１０と接合させ、粘着フィルム４０の第２粘着層側で透明基材３０としての青板ガラスと接合させることにより、図３（ｂ）に示す構造の調光デバイス１００が得られる。
(Example 1)
FIG. 1A shows the adhesive film 40 of Example 1. The adhesive film of Example 1 uses a base material layer 41 made of PET having a thickness of 38 μm and a haze of 0.8%. A first adhesive layer and a second adhesive layer are formed on both surfaces of the base material layer 41. Each adhesive layer is formed by applying a pressure-sensitive adhesive to which UVA (ultraviolet absorber) is added to a film thickness of 50 μm. The structure shown in FIG. 3B is formed by bonding the light control film 10 on the first adhesive layer side of the adhesive film 40 and bonding the blue plate glass as the transparent base material 30 on the second adhesive layer side of the adhesive film 40. Dimming device 100 is obtained.
（実施例２）
図１（ａ）は、実施例２の粘着フィルム４０を示す。実施例２の粘着フィルムは、厚さ５０μｍ，ヘイズ１．２％のＰＥＴ製の基材層４１を使用している。基材層４１の両面には第１粘着層と第２粘着層が形成される。各粘着層はＵＶＡ（紫外線吸収剤）が実施例１と同量添加された粘着剤を膜厚７０μｍで塗布することにより形成される。以降の実施例，比較例では、ＵＶＡ添加量は実施例１の添加密度を１とした場合の相対的な添加密度にて示す。粘着フィルム４０の第１粘着層側で調光フィルム１０と接合させ、粘着フィルム４０の第２粘着層側で透明基材としての青板ガラスと接合させることにより、図３（ｂ）に示す構造の調光デバイス１００が得られる。
(Example 2)
FIG. 1A shows the adhesive film 40 of Example 2. The adhesive film of Example 2 uses a base material layer 41 made of PET having a thickness of 50 μm and a haze of 1.2%. A first adhesive layer and a second adhesive layer are formed on both surfaces of the base material layer 41. Each pressure-sensitive adhesive layer is formed by applying a pressure-sensitive adhesive to which the same amount of UVA (ultraviolet absorber) is added as in Example 1 with a film thickness of 70 μm. In the following Examples and Comparative Examples, the UVA addition amount is shown by the relative addition density when the addition density of Example 1 is 1. The structure shown in FIG. 3B is formed by bonding the light control film 10 on the first adhesive layer side of the adhesive film 40 and bonding the blue plate glass as a transparent base material on the second adhesive layer side of the adhesive film 40. A dimming device 100 is obtained.
（実施例３）
図１（ａ）は、実施例３の粘着フィルム４０を示す。実施例３の粘着フィルムは、厚さ７５μｍ，ヘイズ３．２％のＰＥＴ製の基材層４１を使用している。基材層４１の両面には第１粘着層と第２粘着層が形成される。各粘着層はＵＶＡ（紫外線吸収剤）が実施例１との相対比で１．２の量だけ添加された粘着剤を膜厚７０μｍで塗布することにより形成される。粘着フィルム４０の第１粘着層側で調光フィルム１０と接合させ、粘着フィルム４０の第２粘着層側で透明基材としての青板ガラスと接合させることにより、図３（ｂ）に示す構造の調光デバイス１００が得られる。
(Example 3)
FIG. 1A shows the adhesive film 40 of Example 3. The adhesive film of Example 3 uses a base material layer 41 made of PET having a thickness of 75 μm and a haze of 3.2%. A first adhesive layer and a second adhesive layer are formed on both surfaces of the base material layer 41. Each pressure-sensitive adhesive layer is formed by applying a pressure-sensitive adhesive having UVA (ultraviolet absorber) added in an amount of 1.2 relative to that of Example 1 at a film thickness of 70 μm. The structure shown in FIG. 3B is formed by bonding the light control film 10 on the first adhesive layer side of the adhesive film 40 and bonding the blue plate glass as a transparent base material on the second adhesive layer side of the adhesive film 40. A dimming device 100 is obtained.
（実施例４）
図１（ａ）は、実施例４の粘着フィルム４０を示す。実施例４の粘着フィルムは、厚さ５０μｍ，ヘイズ１．５％のＰＥＴ製の基材層４１を使用している。第１粘着層としてＵＶＡ（紫外線吸収剤）を実施例１との相対比で１．２の添加量で添加した粘着剤を膜厚７０μｍで形成し、第２粘着層としてＵＶＡ（紫外線吸収剤）を実施例１との相対比で０．８の添加量で添加した粘着剤を膜厚５０μｍで形成した。粘着フィルム４０の第１粘着層側で調光フィルム１０と接合させ、粘着フィルム４０の第２粘着層側で透明基材としての青板ガラスと接合させ、図３（ｂ）に示す構造の調光デバイス１００とした。
(Example 4)
FIG. 1A shows the adhesive film 40 of Example 4. The adhesive film of Example 4 uses a base material layer 41 made of PET having a thickness of 50 μm and a haze of 1.5%. A pressure-sensitive adhesive to which UVA (ultraviolet absorber) was added as the first pressure-sensitive adhesive layer in an addition amount of 1.2 relative to Example 1 was formed with a film thickness of 70 μm, and UVA (ultraviolet absorber) was used as the second pressure-sensitive adhesive layer. Was added in an addition amount of 0.8 in a relative ratio to that of Example 1 to form a pressure-sensitive adhesive having a thickness of 50 μm. The first adhesive layer side of the adhesive film 40 is bonded to the dimming film 10, and the second adhesive layer side of the adhesive film 40 is bonded to the blue plate glass as a transparent base material to dimm the structure shown in FIG. 3 (b). The device was 100.
（実施例５）
図１（ａ）は、実施例５の粘着フィルム４０を示す。実施例５の粘着フィルムは、厚さ１２５μｍ，ヘイズ０．６％のＰＥＴ製の基材層４１を使用している。第１粘着層としてＵＶＡ（紫外線吸収剤）を実施例１との相対比で１．２の添加量で添加した粘着剤を膜厚３０μｍで形成し、第２粘着層としてＵＶＡ（紫外線吸収剤）を実施例１との相対比で１．０の添加量で添加した粘着剤を膜厚７０μｍで形成した。粘着フィルム４０の第１粘着層側で調光フィルム１０と接合させ、粘着フィルム４０の第２粘着層側で透明基材としての青板ガラスと接合させ、図３（ｂ）に示す構造の調光デバイス１００とした。
(Example 5)
FIG. 1A shows the adhesive film 40 of Example 5. The adhesive film of Example 5 uses a base material layer 41 made of PET having a thickness of 125 μm and a haze of 0.6%. A pressure-sensitive adhesive to which UVA (ultraviolet absorber) was added as the first pressure-sensitive adhesive layer in an addition amount of 1.2 relative to Example 1 was formed with a thickness of 30 μm, and UVA (ultraviolet absorber) was used as the second pressure-sensitive adhesive layer. Was added in an amount of 1.0 relative to Example 1 to form a pressure-sensitive adhesive having a film thickness of 70 μm. The first adhesive layer side of the adhesive film 40 is bonded to the dimming film 10, and the second adhesive layer side of the adhesive film 40 is bonded to the blue plate glass as a transparent base material to dimm the structure shown in FIG. 3 (b). The device was 100.
（実施例６）
図１（ａ）は、実施例６の粘着フィルム４０を示す。実施例６の粘着フィルムは、厚さ１００μｍ，ヘイズ４．８％のＰＥＴ製の基材層４１を使用している。第１粘着層としてＵＶＡ（紫外線吸収剤）を実施例１との相対比で０．８の添加量で添加した粘着剤を膜厚５０μｍで形成し、第２粘着層としてＵＶＡ（紫外線吸収剤）を実施例１との相対比で０．８の添加量で添加した粘着剤を膜厚５０μｍで形成した。粘着フィルム４０の第１粘着層側で調光フィルム１０と接合させ、粘着フィルム４０の第２粘着層側で透明基材としての青板ガラスと接合させ、図３（ｂ）に示す構造の調光デバイス１００とした。
(Example 6)
FIG. 1A shows the adhesive film 40 of Example 6. The adhesive film of Example 6 uses a base material layer 41 made of PET having a thickness of 100 μm and a haze of 4.8%. A pressure-sensitive adhesive to which UVA (ultraviolet absorber) was added as the first pressure-sensitive adhesive layer in an addition amount of 0.8 relative to Example 1 was formed with a film thickness of 50 μm, and UVA (ultraviolet absorber) was used as the second pressure-sensitive adhesive layer. Was added in an addition amount of 0.8 in a relative ratio to that of Example 1 to form a pressure-sensitive adhesive having a thickness of 50 μm. The first adhesive layer side of the adhesive film 40 is bonded to the dimming film 10, and the second adhesive layer side of the adhesive film 40 is bonded to the blue plate glass as a transparent base material to dimm the structure shown in FIG. 3 (b). The device was 100.
＜比較例＞
（比較例１）
比較例１では基材層は使用していない単層の例である。比較例１では、第１粘着層としてＵＶＡ（紫外線吸収剤）を実施例１との相対比で１．０の量で添加した粘着剤を使用している。比較例１では、調光フィルム１０の一方の表面に粘着層が膜厚１００μｍとなるように設定して形成を試みた。
<Comparison example>
(Comparative Example 1)
Comparative Example 1 is an example of a single layer in which the base material layer is not used. In Comparative Example 1, a pressure-sensitive adhesive to which UVA (ultraviolet absorber) is added in an amount of 1.0 relative to Example 1 is used as the first pressure-sensitive adhesive layer. In Comparative Example 1, an attempt was made to form an adhesive layer on one surface of the light control film 10 by setting the adhesive layer to have a film thickness of 100 μm.
（比較例２）
比較例２も基材層は使用していない単層の例である。比較例２では、調光フィルム１０の一方の表面に、第１粘着層としてＵＶＡ（紫外線吸収剤）を実施例１との相対比で１．５の添加量で添加した粘着剤を膜厚７０μｍで形成した。
(Comparative Example 2)
Comparative Example 2 is also an example of a single layer in which the base material layer is not used. In Comparative Example 2, a pressure-sensitive adhesive having UVA (ultraviolet absorber) added as a first pressure-sensitive adhesive layer on one surface of the light control film 10 in a relative ratio of 1.5 to that of Example 1 was added to a thickness of 70 μm. Formed with.
（比較例３）
比較例３は、３層構成の粘着フィルムの例である。比較例３では、厚さ５０μｍ，ヘイズ２．１％のＰＥＴ製の基材層を使用している。基材層の一方の面には、第１粘着層としてＵＶＡ（紫外線吸収剤）を実施例１との相対比で０．８の添加量で添加した粘着剤を膜厚５０μｍで形成している。基材層の他方の面には、第２粘着層としてＵＶＡ（紫外線吸収剤）を実施例１との相対比で１．０の添加量で添加した粘着剤を膜厚５０μｍで形成している。粘着フィルムの第１粘着層側で調光フィルムと接合させ、粘着フィルム４０の第２粘着層側で透明基材としての青板ガラスと接合させることにより、調光デバイスを得た。
(Comparative Example 3)
Comparative Example 3 is an example of an adhesive film having a three-layer structure. In Comparative Example 3, a PET base material layer having a thickness of 50 μm and a haze of 2.1% is used. On one surface of the base material layer, a pressure-sensitive adhesive to which UVA (ultraviolet absorber) is added as a first pressure-sensitive adhesive layer in a relative ratio of 0.8 to that of Example 1 is formed with a film thickness of 50 μm. .. On the other surface of the base material layer, a pressure-sensitive adhesive to which UVA (ultraviolet absorber) is added as a second pressure-sensitive adhesive layer in a relative ratio of 1.0 to Example 1 is formed with a film thickness of 50 μm. .. A dimming device was obtained by bonding to a light control film on the first adhesive layer side of the adhesive film and bonding to a blue plate glass as a transparent base material on the second adhesive layer side of the adhesive film 40.
（比較例４）
比較例４では、厚さ７５μｍ，ヘイズ０．８％のＰＥＴ製の基材層を使用している。また、各粘着層の材料はいずれも実施例１との相対比で１．０の量でＵＶＡ（紫外線吸収剤）を添加した接着剤を使用する。基材層の一方の面には、第１粘着層として設計上の膜厚が８０μｍとなるように接着層の形成を試みた。また、基材層の他方の面には、第２粘着層として膜厚５０μｍで形成している。
(Comparative Example 4)
In Comparative Example 4, a PET base material layer having a thickness of 75 μm and a haze of 0.8% is used. Further, as the material of each adhesive layer, an adhesive to which UVA (ultraviolet absorber) is added in an amount of 1.0 in a relative ratio to that of Example 1 is used. An attempt was made to form an adhesive layer on one surface of the base material layer so that the design film thickness was 80 μm as the first adhesive layer. Further, on the other surface of the base material layer, a second adhesive layer is formed with a film thickness of 50 μm.
＜評価＞
（１）塗工可否
実施例１における第１粘着層の塗工のラインスピード（溶剤が蒸発するまで）を１とした際、相対値が２以上となる実測データをＮＧ判定（×）した。
（２）ブリードアウト
塗工した粘着層を目視観察し、ブリードアウトしているものをＮＧ判定した。
（３）耐光性
アイ スーパーＵＶテスター（ＳＵＶ−Ｗ２６１：岩崎電気株式会社製）を用いて、温度：６３℃，照度：６５０Ｗ／ｍ２，湿度：６０％，シャワーなしの条件下に１００時間サンプル（調光デバイス）を放置して加速試験を実施。その後、分光光度計（Ｕ４１００
：日立ハイテクサイエンス社製）を用いて、試験前後のサンプルの分光透過率を計測し、ΔＥａ*ｂ*を算出し、１０以下のサンプルをＯＫ判定（○）した。
<Evaluation>
(1) Applicability of coating When the line speed (until the solvent evaporates) of coating the first adhesive layer in Example 1 is set to 1, the measured data having a relative value of 2 or more was judged as NG (x).
(2) Bleed-out The coated adhesive layer was visually observed, and the bleed-out was judged to be NG.
(3) Using a light-resistant eye super UV tester (SUV-W261: manufactured by Iwasaki Electric Co., Ltd.), sample for 100 hours under the conditions of temperature: 63 ° C., illuminance: 650 W / m 2 , humidity: 60%, and no shower. An acceleration test was conducted with the (dimming device) left unattended. After that, the spectrophotometer (U4100)
: Hitachi High-Tech Science Corporation) was used to measure the spectral transmittance of the samples before and after the test, ΔEa * b * was calculated, and samples of 10 or less were judged to be OK (◯).
実施例，比較例の評価結果を表１に示す。 Table 1 shows the evaluation results of Examples and Comparative Examples.
比較例１，２は、基材フィルムの両面に粘着層が形成されてなる本発明の構成による粘着フィルムではなく、単層で用いることを意図した粘着層である。比較例１では、粘着層の厚さが７５μｍを上回るため、ラインスピードが低下し、塗工適性での問題があった。比較例２では、粘着層へのＵＶＡの添加量が過剰（実施例１との相対比で１．５）であり、紫外線吸収剤の析出（ブリードアウト）を起こしてしまった。 Comparative Examples 1 and 2 are not the pressure-sensitive adhesive film having the structure of the present invention in which the pressure-sensitive adhesive layers are formed on both sides of the base film, but the pressure-sensitive adhesive layer intended to be used as a single layer. In Comparative Example 1, since the thickness of the adhesive layer exceeds 75 μm, the line speed is lowered and there is a problem in coating suitability. In Comparative Example 2, the amount of UVA added to the adhesive layer was excessive (1.5 in relative ratio to Example 1), causing precipitation (bleed-out) of the ultraviolet absorber.
比較例３は実施例１と比べて、第１，第２粘着層の厚さが等しく、第１粘着層でのＵＶＡの添加量が少なく、厚くヘイズの高いＰＥＴ基材フィルムを用いている。粘着フィルムとしては、波長２５０ｎｍ以上３９５ｎｍ以下の範囲における最大透過率が指標である１％を超えて（１．２％）しまい、紫外線照射に対する耐光性の管理目標となるΔＥａ*
ｂ*の指標値１０を超えて（１０．２）しまっており、紫外線から調光デバイスを保護する上での粘着フィルムとしては不十分な評価結果を表している。
In Comparative Example 3, a PET base film having the same thickness of the first and second adhesive layers, a smaller amount of UVA added to the first adhesive layer, and a thick haze is used as compared with Example 1. As an adhesive film, the maximum transmittance in the wavelength range of 250 nm or more and 395 nm or less exceeds the index of 1% (1.2%), which is a control target of light resistance to ultraviolet irradiation, ΔEa *.
The index value of b * exceeds 10 (10.2), which indicates an insufficient evaluation result as an adhesive film for protecting a dimming device from ultraviolet rays.
比較例４では、粘着層の厚さが７５μｍを上回るため、ラインスピードが低下し、塗工適性での問題があった。さらに言えば、第１粘着層の設計値たる厚さ８０μｍを維持することができず、実用に耐えうるサンプルが得られなかった。 In Comparative Example 4, since the thickness of the adhesive layer exceeds 75 μm, the line speed is lowered, and there is a problem in coating suitability. Furthermore, the design value of the first adhesive layer of 80 μm could not be maintained, and a sample that could withstand practical use could not be obtained.
実施例１〜６では、粘着層としての塗工適性に問題なく、ブリードアウトも発生せず、剥離強度も満足な評価結果であった。また、粘着フィルムとしても、波長２５０ｎｍ以上３９５ｎｍ以下の範囲における最大透過率が１％以下であり、紫外線照射に対する耐光性に問題なく、１０％以下の低い良好なヘイズであった。 In Examples 1 to 6, there was no problem in coating suitability as an adhesive layer, bleed-out did not occur, and the peel strength was a satisfactory evaluation result. Further, as the adhesive film, the maximum transmittance in the wavelength range of 250 nm or more and 395 nm or less was 1% or less, there was no problem in the light resistance to ultraviolet irradiation, and the haze was as low as 10% or less.
１０ 調光フィルム
１５（ａ，ｂ） 透明電極フィルム
１１（ａ，ｂ） 基材フィルム
１２ 透明電極
１３ 液晶層
２０ 給電電極
１００ 調光デバイス
３０（ａ，ｂ） 透明基材
４０ 粘着フィルム
４１（ａ，ｂ） 基材フィルム
４２ａ 第１粘着層
４２ｂ 第２粘着層
10 Dimming film 15 (a, b) Transparent electrode film 11 (a, b) Base film 12 Transparent electrode 13 Liquid crystal layer 20 Feeding electrode 100 Dimming device 30 (a, b) Transparent base material 40 Adhesive film 41 (a) , B) Base film 42a 1st adhesive layer 42b 2nd adhesive layer
Claims (9)
前記液晶層を挟持する一対の透明電極フィルムと、
前記一対の透明電極フィルムの少なくとも一方における前記液晶層とは反対側の面に設けられた粘着フィルムと、を有し、
前記粘着フィルムは、前記透明電極フィルム側から順に、第１粘着層、基材層、第２粘着層を有し、かつ紫外域における最大透過率が１％以下である、
ことを特徴とする調光体。 A liquid crystal layer that changes the transmittance of incident light according to the applied voltage,
A pair of transparent electrode films that sandwich the liquid crystal layer,
At least one of the pair of transparent electrode films has an adhesive film provided on a surface opposite to the liquid crystal layer.
The adhesive film has a first adhesive layer, a base material layer, and a second adhesive layer in this order from the transparent electrode film side, and has a maximum transmittance of 1% or less in the ultraviolet region.
A dimming body characterized by that.
前記第２粘着層は該第２粘着層に貼り付けられる基材に対する剥離強度が４Ｎ／２５ｍｍ以上である、
但し、前記剥離強度は、ＪＩＳ Ｚ ０２３７（２００９）により規定される、
ことを特徴とする請求項１に記載の調光体。 The first adhesive layer has a peel strength of 4 N / 25 mm or more with respect to the transparent electrode film.
The second adhesive layer has a peel strength of 4 N / 25 mm or more with respect to the base material to be attached to the second adhesive layer.
However, the peel strength is defined by JIS Z 0237 (2009).
The dimmer according to claim 1.
前記基材に前記第２粘着層を介して接合される請求項１から請求項７の何れか１項に記載の調光体と、
を有することを特徴とする調光デバイス。 With the base material
The dimming body according to any one of claims 1 to 7, which is bonded to the base material via the second adhesive layer.
A dimming device characterized by having.
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