JP7534909B2 - 調光積層体 - Google Patents
調光積層体 Download PDFInfo
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- JP7534909B2 JP7534909B2 JP2020166852A JP2020166852A JP7534909B2 JP 7534909 B2 JP7534909 B2 JP 7534909B2 JP 2020166852 A JP2020166852 A JP 2020166852A JP 2020166852 A JP2020166852 A JP 2020166852A JP 7534909 B2 JP7534909 B2 JP 7534909B2
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- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
Description
本発明に係る調光積層体は、第1の基板と、第2の基板と、上記第1の基板と上記第2の基板との間に配置された調光層とを備える。本発明に係る調光積層体では、上記調光層が、複数のスペーサ粒子を含む。本発明に係る調光積層体では、上記スペーサ粒子が、上記第1の基板には接着せず、上記第2の基板にのみ接着している。
上記調光層は、調光性を有する。上記調光性とは、電界の印加の有無により可視光透過率が変化し、入射光量を調整することができる性質である。可視光透過率を変化させる作用機構としては、例えば、PDLC(Polymer Dispersed Liquid Crystal)方式、SPD(Suspended Particle Device)方式、液晶を使用したゲストホスト型液晶方式、TN(Twisted Nematic)方式、VA(Vertical Alignment)方式、IPS(In-Plane-Switching)方式等がある。上記調光積層体は、PDLC方式の調光積層体又はSPD方式の調光積層体であることが好ましい。上記調光層の材料は、特に限定されず、調光性を有していれば、どのような材料であってもよい。
上記調光層は、バインダーと、上記バインダー中に分散している液晶材料とをさらに含むことが好ましい。
上記調光層は、樹脂マトリックスと、上記樹脂マトリックス中に分散している光調整懸濁液とをさらに含むことが好ましい。
上記調光層は、複数のスペーサ粒子を含む。上記スペーサ粒子は、調光積層体に用いられるスペーサ粒子である。上記スペーサ粒子は、調光積層体用スペーサ粒子である。
ρ:上記スペーサ粒子の粒子径の標準偏差
Dn:上記スペーサ粒子の粒子径の平均値
F:スペーサ粒子が10%圧縮変形したときの荷重値(N)
S:スペーサ粒子が10%圧縮変形したときの圧縮変位(mm)
R:スペーサ粒子の半径(mm)
上記第1の基板及び上記第2の基板は、光透過性を有する基材(光透過性基材)であることが好ましい。上記第1の基板及び上記第2の基板は、透明基材であることが好ましい。例えば、透明基材の一方側から、透明基材を介して他方側に光が透過する。例えば、透明基材の一方側から、透明基材を介して他方側にある物質を目視したときに、物質を視認可能である。透明には、半透明も含まれる。透明基材は、無色透明であってもよく、有色透明であってもよい。
スペーサ粒子1(樹脂粒子、平均粒子径12μm、CV値3.8%、下記の合成例1に従って作製)
スペーサ粒子2(コアシェル粒子、平均粒子径14μm、CV値4.7%、下記の合成例2に従って作製)
柱状スペーサ3(コアシェル型マイクロロッド、平均ロッド径10.3μm、CV値1.9%、下記の合成例3に従って作製)
スペーサ粒子4(積水化学工業社製「SP-220」、平均粒子径20.0μm、CV値4.7%)
スペーサ粒子5(積水化学工業社製「EZ3P-020」、平均粒子径20.0μm、CV値5%)
温度計、撹拌機、冷却管を備えた反応容器に、ビスフェノールA型エポキシ樹脂(DIC社製「EXA-850-CRP」)15重量部と、分散安定剤としてポリビニルピロリドン7.5重量部と、エタノール250重量部とを投入し、65℃で1時間撹拌することで均一に溶解させた。次に、4,4’-ジアミノジフェニルメタン2.1重量部と、エタノール35重量部とを混合し、均一に溶解させた後、反応容器内に添加し、65℃及び20時間の条件で反応させ、反応生成物を得た。得られた反応生成物をメタノールで洗浄した後、分級操作を行ってスペーサ粒子1を回収した。
温度計、撹拌機、冷却管を備えた反応容器に、コアの材料として、樹脂粒子(積水化学工業社製「ミクロパールSP-210」)50重量部と、水500重量部と、分散安定剤としてポリアリルアミン100重量部とを入れて、均一に溶解させた後に、25℃及び1時間の条件で反応させ、反応生成物を得た。得られた反応生成物を洗浄し、乾燥させて、コアを得た。得られたコア30重量部と、シェルの材料として、2,2-ビス(4-グリシジルオキシフェニル)プロパン20重量部及び2,2-ビス[4-(4-アミノフェノキシ)フェニル]プロパン16.5重量部と、分散安定剤として、ポリビニルピロリドン6.8重量部及びエタノール250重量部とを混合し、均一に溶解させた。その後、65℃及び24時間の条件で反応させ、反応生成物を得た。得られた反応生成物をメタノールにて数回洗浄した後、分級操作を行ってスペーサ粒子2を回収した。
温度計、撹拌機、冷却管を備えた反応容器に、コアの材料として、マイクロロッド(日本電気硝子社製「PF-90S」)50重量部と、水500重量部と、分散安定剤としてポリアリルアミン100重量部とを入れて、均一に溶解させた後に、25℃及び1時間の条件で反応させ、反応生成物を得た。得られた反応生成物を洗浄し、乾燥させて、コアを得た。上記で得られたコア30重量部と、シェルの材料として、2,2-ビス(4-グリシジルオキシフェニル)プロパン20重量部及び2,2-ビス[4-(4-アミノフェノキシ)フェニル]プロパン16.5重量部と、分散安定剤として、ポリビニルピロリドン6.8重量部及びエタノール250重量部とを混合し、均一に溶解させた。その後、65℃及び24時間の条件で反応させ、反応生成物を得た。得られた反応生成物をメタノールにて数回洗浄した後、分級操作を行って柱状スペーサ3を得た。
PDLC方式の調光積層体の作製
第1の基板、第2の基板として、表面に透明導電膜(ITO)を有するPETフィルムを用意した。第2の基板の表面上に、スペーサ粒子1を15個/cm2となるように散布した。スペーサ粒子1が散布された第1の基板を、0.05kgf/cm2の圧力で、120℃で100分間加熱して、スペーサ粒子1を第2の基板上に接着させた。次いで、調光材料(「Macromolecules」、第26巻第6132~6134頁(1993年)に記載の方法に準拠して作製)を積層し、第1の基板を積層して、調光積層体を得た。このとき、加圧は行わなかった。
調光積層体の構成を表1のように変更したこと以外は、実施例1と同様にして、調光積層体を作製した。
第2の基板の表面上に各スペーサ粒子を散布した後、加圧及び加熱を行わなかったこと以外は、実施例1と同様にして、調光積層体を作製した。
第2の基板の表面上にスペーサ粒子1を散布した。スペーサ粒子1が散布された第1の基板の表面上に、上記調光材料を積層し、第1の基板を積層した後に、0.05kgf/cm2の圧力で、120℃で100分間加熱したこと以外は、実施例1と同様にして、調光積層体を作製した。
(1)角θの測定
得られた調光積層体について、上述した方法で、上記第2の基板と上記スペーサ粒子とのなす角θを測定した。
得られた調光積層体について、上述した方法で、第1の基板とスペーサとの接触部の面積(A1)の、第2の基板とスペーサとの接着部の面積(A2)に対する比を計算した。
得られた調光積層体を、曲率0.1の円筒板を用いて湾曲させ、曲面部を有する調光積層体を得た。該調光積層体について、調光層の厚みを走査型電子顕微鏡を用いて測定した。調光層の厚みの最小値の、調光層の厚みの最大値に対する比(調光層の厚みの最小値/調光層の厚みの最大値)を計算し、ギャップ制御性を、下記の基準で判定した。
○○:比(調光層の厚みの最小値/調光層の厚みの最大値)が0.95以上
○:比(調光層の厚みの最小値/調光層の厚みの最大値)が0.90以上0.95未満
△:比(調光層の厚みの最小値/調光層の厚みの最大値)が0.70以上0.90未満
×:比(調光層の厚みの最小値/調光層の厚みの最大値)が0.70未満
得られた調光積層体を、曲率0.1の円筒板を用いて湾曲させ、曲面部を有する調光積層体を得た。該調光積層体において、スペーサが移動又は剥離せず、調光層内に均一に残存しているか否かを、デジタルマイクロスコープ(キーエンス社製「VHX-2000」)を用いて観察した。第2の基板表面の任意の5箇所の1cm2の領域において、残存しているスペーサの個数を計測した。残存しているスペーサの個数の標準偏差を求め、スペーサの残存性を、下記の基準で判定した。
○○:標準偏差が2未満
〇:標準偏差が2以上4未満
△:標準偏差が4以上6未満
×:標準偏差が6以上
得られた調光積層体の任意の200箇所において、導電膜が第1の基板及び第2の基板から剥がれているか否かを、デジタルマイクロスコープ(キーエンス社製「VHX-2000」)を用いて確認した。導電膜の剥がれを、下記の基準で判定した。
○○:導電膜の剥がれが2箇所以下
○:導電膜の剥がれが3箇所以上10箇所以下
△:導電膜の剥がれが11箇所以上30箇所以下
×:導電膜の剥がれが31箇所以上
2,2A…第1の基板
3,3A…第2の基板
4,4A…調光層
4a,4Aa…スペーサ粒子
Claims (7)
- 第1の基板と、第2の基板と、前記第1の基板と前記第2の基板との間に配置された調光層とを備え、
前記調光層が、複数のスペーサ粒子を含み、
前記スペーサ粒子が、前記第1の基板には接着せず、前記第2の基板にのみ接着しており、
前記スペーサ粒子が、前記第1の基板に接触しており、
前記第1の基板と前記スペーサ粒子との接触部の面積の、前記第2の基板と前記スペーサ粒子との接着部の面積に対する比が、0を超え0.90以下であり、
前記第2の基板と、前記スペーサ粒子とのなす角が、5°以上45°以下である、調光積層体。 - 曲面部を有する、請求項1に記載の調光積層体。
- 前記スペーサ粒子が、前記第2の基板に面接着している、請求項1又は2に記載の調光積層体。
- 前記第1の基板と前記スペーサ粒子との接触部の面積の、前記第2の基板と前記スペーサ粒子との接着部の面積に対する比が、0.10以上0.90以下である、請求項1~3のいずれか1項に記載の調光積層体。
- 前記第1の基板と前記スペーサ粒子との接触部の面積の、前記第2の基板と前記スペーサ粒子との接着部の面積に対する比が、0.66以上0.80以下である、請求項4に記載の調光積層体。
- 前記第1の基板及び前記第2の基板に対して水平方向に切断した際の前記スペーサ粒子の断面積の極大値が、前記第1の基板と前記第2の基板との間の位置、かつ前記第1の基板及び前記第2の基板から離れた位置に存在する、請求項1~5のいずれか1項に記載の調光積層体。
- 前記スペーサ粒子の粒子径のCV値が10%以下である、請求項1~6のいずれか1項に記載の調光積層体。
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JP2003043495A (ja) | 2001-08-03 | 2003-02-13 | Soken Chem & Eng Co Ltd | 2次変形異方接着性スペーサー粒子、その製造方法及びその粒子を用いる表示デバイス。 |
US20090091677A1 (en) | 2007-10-05 | 2009-04-09 | Jun Beom Cho | Liquid crystal display and method for manufacturing the same |
JP2017181896A (ja) | 2016-03-31 | 2017-10-05 | 大日本印刷株式会社 | 液晶セルの製造方法 |
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