JP6470860B1 - コーティング組成物、導電性膜及び液晶表示パネル - Google Patents
コーティング組成物、導電性膜及び液晶表示パネル Download PDFInfo
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- JP6470860B1 JP6470860B1 JP2018047839A JP2018047839A JP6470860B1 JP 6470860 B1 JP6470860 B1 JP 6470860B1 JP 2018047839 A JP2018047839 A JP 2018047839A JP 2018047839 A JP2018047839 A JP 2018047839A JP 6470860 B1 JP6470860 B1 JP 6470860B1
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Images
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133514—Colour filters
- G02F1/133516—Methods for their manufacture, e.g. printing, electro-deposition or photolithography
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/006—Surface treatment of glass, not in the form of fibres or filaments, by coating with materials of composite character
- C03C17/008—Surface treatment of glass, not in the form of fibres or filaments, by coating with materials of composite character comprising a mixture of materials covered by two or more of the groups C03C17/02, C03C17/06, C03C17/22 and C03C17/28
- C03C17/009—Mixtures of organic and inorganic materials, e.g. ormosils and ormocers
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
- C03C17/42—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating of an organic material and at least one non-metal coating
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- C—CHEMISTRY; METALLURGY
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Abstract
Description
先ず、本発明のコーティング組成物について説明する。
本発明のコーティング組成物は、上記鎖状導電性無機粒子の含有量を、上記鎖状導電性無機粒子及び上記バインダの合計量に対して30〜90質量%とすることで、ESD機能が高く、且つタッチ感度を低下させない導電性膜を提供できる。上記鎖状導電性無機粒子の含有量が30質量%を下回ると導電性膜のESD機能が低下し、上記鎖状導電性無機粒子の含有量が90質量%を超えるとタッチ感度が低下する。鎖状導電性無機粒子の含有量は、上記鎖状導電性無機粒子及び上記バインダの合計量に対して、好ましくは40〜88質量%、より好ましくは50〜85質量%、更に好ましくは72〜76質量%である。
上記バインダとしては、上記鎖状導電性無機粒子を分散して塗膜を形成できるものであれば特に限定されず、無機系バインダ及び有機系バインダのいずれも使用できる。上記バインダの含有量は、上記鎖状導電性無機粒子及び上記バインダの合計量に対して10質量%以上とすることが好ましい。10質量%を下回ると導電性薄膜の強度が低下する傾向があるからである。
上記高沸点溶剤としては、バインダ成分を溶解し、且つ塗布後の乾燥工程によって除去できるものであればよく、例えば、エチレングリコール、ジメチルスルホキシド、N−メチルピロリドン、N−エチルピロリドン、N−メチルホルムアミド、1,2−プロパンジオール、N,N−ジメチルアニリン、クレゾール、ニトロベンゼン等を使用できる。特に好ましくは、エチレングリコール、ジメチルスルホキシドが挙げられる。高沸点溶剤は、沸点120℃以上の有機系および無機系の溶剤が好ましい。
上記低沸点溶剤としては、例えば、エチルアルコール、メチルアルコール、n−プロピルアルコール、イソプロピルアルコール、n−ブチルアルコール、イソブチルアルコール、メチルエチルケトン、メチルイソブチルケトン、テトラヒドロフラン、アセトン、ジオキサン、酢酸エチル、クロロホルム、アセトニトリル、ピリジン、酢酸、水等を使用できる。特に好ましくは、エチルアルコール、メチルアルコール、n−プロピルアルコール、イソプロピルアルコールが挙げられる。上記低沸点溶剤を使用することにより、上記鎖状導電性無機粒子の分散性が向上する。低沸点溶剤は、沸点120℃未満の有機系および無機系の溶剤が好ましい。
本発明のコーティング組成物には、一般に使用される酸触媒(塩酸、硫酸、酢酸、リン酸等)を更に添加することができる。これにより、より安定した性能で高品質の導電性膜を再現性よく形成可能となる。上記酸触媒の含有量は、アルコキシシラン全体量に対して1.0〜30.0質量%程度とすればよい。
本発明のコーティング組成物には、レベリング剤を更に添加することができる。これにより、導電性膜の表面平滑性が確保できる。上記レベリング剤としては、例えば、ポリエーテル変性ポリジメチルシロキサン、ジプロピレングリコールモノメチルエーテル等を使用できる。上記レベリング剤触媒の含有量は、導電性コーティング組成物全体量に対して0.01〜5.0質量%程度とすればよい。
本発明のコーティング組成物の調製法は、上記各成分を混合して、上記鎖状導電性無機粒子を上記バインダと上記溶剤の中に分散できれば特に限定されず、例えば、上記各成分をボールミル、サンドミル、ピコミル、ペイントコンディショナー等のメディアを介在させた機械的処理、又は超音波分散機、ホモジナイザー、ディスパー及びジェットミル等を使用して分散処理を施して混合・分散することができる。
次に、本発明の導電性膜について説明する。
本発明のコーティング組成物が適用されるタッチパネルは、タッチパネル基板がTFTアレイ基板とカラーフィルタ基板の間に内包された層構造を有する型のタッチパネルである。かかるタッチパネルとしては、典型的には、インセル型タッチパネルが例示される。
鎖状ATO粒子分散液として、日揮触媒化成社製“ELCOM V−3560”を準備した。鎖状ATO粒子分散液“ELCOM V−3560”は、鎖状ATO粒子19.2部、シリカ系分散剤1.3部、エチルアルコール70.0部及びイソプロピルアルコール9.5部の混合分散液である。
<分散液Aの製造>
プラスチック製ビンに、石原産業(株)製の導電性ATO粒子「SN100P」(商品名)20.5部、ビックケミージャパン社製の分散剤「BYK180」(商品名)2.0部、及びイソブチルアルコール(溶剤)77.5部を仕込み、直径0.3mmのジルコニアビーズを用いて、ペイントコンディショナー(東洋精機(株)製)により2時間分散した後、攪拌して分散液Aを製造した。
適量の低沸点アルコールと塩酸触媒と水を加えた溶液に、適量のテトラメトキシシランを少しずつ滴下して加え、温度とpHを制御しながら、一定時間攪拌した後、イオン交換樹脂で脱酸処理して、固形分濃度10wt%、重量平均分子量5,200のアルコキシシランオリゴマー溶液を作製した。
適量の低沸点アルコールと塩酸触媒と水を加えた溶液に、適量のテトラエトキシシランを少しずつ滴下して加え、温度とpHを制御しながら、一定時間攪拌した後、イオン交換樹脂で脱酸処理して、固形分濃度10wt%、重量平均分子量8,600のアルコキシシランオリゴマーを合成した。
<コーティング組成物の製造>
プラスチック製ビンに、各成分を所定の含有量になる量で仕込み、攪拌してコーティング組成物を調製した。但し、アルコキシシランは、アルコールの一部を用いて希釈し、水と酸触媒を加えてあらかじめシラノール化させて使用した。
サイズ10cm四方、厚み0.3mmの無アルカリガラスの基板に、上記コーティング組成物をスプレーコート法によって塗布して塗膜を形成した。スプレーコーターには、ノードソン社製のスプレーガン(スワールノズル、口径:1.0mm)を用いた。塗布条件は次の通りとした。即ち、ニードル開度:0.10mm、スプレーガンと基板との最短距離:100mm、塗布速度:300mm/秒、重ねピッチ:10mm、アトマイズエアー及びスワールエアーの圧力:0.25MPa、膜厚を制御するため、吐出液量は0.50〜1.00g/minの範囲に調整し、形成された塗膜を120℃で1時間加熱して導電性膜を作製した。
導電性膜をガラス基板ごと切断し、走査型電子顕微鏡(SEM、日立製作所社製“S−4500”)にて断面観察して、膜厚を測定した。
表面抵抗計(三菱化学社製“ハイレスタMCP−HT450”、印加電圧:10V)を用いて、導電性膜の表面電気抵抗を測定し、通常の表面電気抵抗とした。
先ず、日本電色工業社製の光度計“ヘイズメーターNDH2000”を用い、導電性膜付ガラス基板の全光線透過率を測定した。数値は塗膜のみの値を示す。
導電性膜の鉛筆硬度を新東科学社製の表面性試験機“HEIDON−14DR”を用いて測定した。
三星ダイヤモンド工業株式会社製の簡易スラクイバー“Linear Cutter LC200AHH”、及びスクライブホイール“APIO φ3mm TYPEA”を用いて導電性膜を付与したガラスを切断し、ガラス切断性を評価した。
○:付着物なし、切断面良好、△:付着物少しあり、切断面に少しカケあり、×:付着物あり、切断面のカケあり
上記、導電性膜の製造において、厚み0.1mmの無アルカリガラスの基板を用いた他は、同様になして導電性膜を作製し、反りの状態を確認した。
○:ガラス端部の浮きが全くない、△:わずかに浮きがある、×:顕著に浮きがある
画面サイズが4インチ、液晶表示装置のトータルの厚みが0.3mmの図1に示す構成の液晶表示装置を作製した。
上記液晶表示装置を指でタッチし、タッチ感度を確認した。その結果、指のタッチに反応した場合を○、指のタッチに反応しなかった場合を×と評価した。
下部ガラス基板側からバックライトにより光を照射し、上記液晶表示装置が無通電状態で黒表示であることを確認した後、上部ガラス基板に静電印加装置にて電圧±12kVにて静電を印加した。その後、導電性膜のアース線を接地してから、無通電状態の表示を目視により確認した。その結果、上記液晶表示装置が黒表示を維持していた場合を○、光抜けによる白浮きが認められた場合を×と評価した。
一方、表5と表7の結果から、鎖状ATO粒子を含まないコーティング液を用いて作製した比較例1の導電性膜は、表面電気抵抗が高く、透過率が低く、鉛筆硬度も小さいことが分かる。すなわち、液晶表示装置に組み込んだ場合、タッチ感度とESD性が劣ることが明確である。
2…下部偏光板、
3…上部偏光板、
4…TFTアレイ基板、
5’…コモン電極兼タッチ検出電極、
72…液晶層
8…カラーフィルタ基板、
9…導電性膜
Claims (12)
- 鎖状導電性無機粒子と、バインダと、高沸点溶剤と、低沸点溶剤とを含むコーティング組成物であって、該コーティング組成物は、鎖状導電性無機粒子の含有量が鎖状導電性無機粒子及びバインダの合計量に対して30〜90質量%であり、バインダは重量平均分子量1,000〜20,000のアルコキシシランオリゴマーであり、TFTアレイ基板、タッチ検出電極、液晶層、及びカラーフィルタ基板を有する液晶表示パネルにおいて、該カラーフィルタ基板の液晶層とは反対側の基材表面に導電性膜を形成する用途に使用されるものである、コーティング組成物。
- 前記液晶表示パネルはインセル型タッチパネルである請求項1に記載のコーティング組成物。
- 前記導電性膜が形成される基材は500μm以下の厚みを有する請求項1又は2に記載のコーティング組成物。
- 前記導電性膜が形成される基材は、最下層にTFTアレイ基板、最上層にカラーフィルタ基板を有する積層体である請求項1〜3のいずれか一項に記載のコーティング組成物。
- 前記鎖状導電性無機粒子と前記バインダから成る固形分を0.1〜20.0質量%の量で含有し、0.5〜100mPa・sの粘度を有する請求項1〜4のいずれか一項に記載のコーティング組成物。
- 前記鎖状導電性無機粒子は、粒子径が2〜30nmの一次粒子が2〜50個連接してなる請求項1〜5のいずれか一項に記載のコーティング組成物。
- 前記鎖状導電性無機粒子は、アンチモン含有酸化スズ粒子、スズ含有酸化インジウム粒子及びリン含有酸化スズ粒子からなる群から選ばれる少なくとも1種の粒子を含む請求項1〜6のいずれか一項に記載のコーティング組成物。
- TFTアレイ基板、タッチ検出電極、液晶層、及びカラーフィルタ基板を有する液晶表示パネルにおいて、該カラーフィルタ基板の液晶層とは反対側の基材表面に、請求項1〜5のいずれか一項に記載のコーティング組成物を使用して形成された、導電性膜。
- 10〜300nmの膜厚を有する請求項8に記載の導電性膜。
- 1.0×107〜1.0×1010Ω/スクエアの表面電気抵抗を有する請求項8又は9に記載の導電性膜。
- 3H〜9Hの鉛筆硬度を有する請求項8〜10のいずれか一項に記載の導電性膜。
- TFTアレイ基板、タッチ検出電極、液晶層、カラーフィルタ基板、及び請求項8〜11のいずれか一項に記載の導電性膜を有する液晶表示パネル。
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