JP2017171903A - 波長変換機能を有する粘着テープ - Google Patents
波長変換機能を有する粘着テープ Download PDFInfo
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- JP2017171903A JP2017171903A JP2017048137A JP2017048137A JP2017171903A JP 2017171903 A JP2017171903 A JP 2017171903A JP 2017048137 A JP2017048137 A JP 2017048137A JP 2017048137 A JP2017048137 A JP 2017048137A JP 2017171903 A JP2017171903 A JP 2017171903A
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Landscapes
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Abstract
Description
1つの実施形態においては、上記粘着剤層は、スチレン系熱可塑性エラストマー、イソブチレン系ポリマーおよびその組み合わせから選択されるゴム系ポリマーを含む。
1つの実施形態においては、上記粘着剤層は、515nm〜650nmの範囲の波長帯域に発光中心波長を有する少なくとも1つの波長変換材料を含む。さらなる実施形態においては、上記粘着剤層は、第1の波長変換材料および第2の波長変換材料を含む少なくとも2つの波長変換材料を含む。該第1の波長変換材料は515nm〜550nmの範囲の波長帯域に発光中心波長を有し、該第2の波長変換材料は605nm〜650nmの範囲の波長帯域に発光中心波長を有する。
1つの実施形態においては、上記粘着剤層は、有機化処理された層状ケイ酸塩を含む。
1つの実施形態においては、上記粘着剤層の厚み50μm換算の水蒸気透過率は、100g/(m2・day)以下である。
1つの実施形態においては、上記粘着剤層の厚みは20μm以上である。
本発明の別の局面による粘着テープは、波長変換機能を有する液晶表示装置の光漏れ防止用粘着テープであって、該粘着テープに所定波長の光が入射した際に得られる発光強度は、該液晶表示装置に該所定波長の光が入射した際に該液晶表示装置の波長変換機能により得られる発光強度と同等またはそれ以下である。
図1は、本発明の1つの実施形態による粘着テープを説明する概略断面図である。粘着テープ100は、基材10と粘着剤層20とを有する。粘着剤層20は、波長変換機能を有する。その結果、粘着テープ100は、全体として波長変換機能を有する。すなわち、粘着テープ100は、所定の波長の光を吸収し、当該所定の波長とは異なる波長の光を発光し得る。
B−1.基材
基材10は、粘着テープの基材を構成し得る任意の適切な材料で構成され得る。基材を構成する材料は、代表的には樹脂である。好ましくは、樹脂は、バリア機能、透明性および/または光学的等方性を有し得る。このような樹脂の具体例としては、環状オレフィン系樹脂、ポリカーボネート系樹脂、セルロース系樹脂、ポリエステル系樹脂、アクリル系樹脂が挙げられる。好ましくは、環状オレフィン系樹脂(例えば、ノルボルネン系樹脂)、ポリエステル系樹脂(例えば、ポリエチレンテレフタレート(PET))、アクリル系樹脂(例えば、主鎖中にラクトン環やグルタルイミド環などの環状構造を有するアクリル系樹脂)である。これらの樹脂は、バリア機能、透明性および光学的等方性のバランスに優れ得る。
バリア層は、基材に適切なバリア機能を付与し得る。バリア層を設けることにより、酸素および/または水蒸気による粘着剤層の波長変換材料の劣化をさらに良好に防止することができる。
粘着剤層10は、上記のとおり、代表的にはマトリックスとしての粘着剤と該粘着剤中に分散された波長変換材料とを含む。
マトリックスを構成する粘着剤は、好ましくは、低い酸素透過性および透湿性を有し、高い光安定性および化学的安定性を有し、所定の屈折率を有し、優れた透明性を有し、光学的等方性を有し、および/または、波長変換材料に対して優れた分散性を有する。
波長変換材料は、粘着剤層の波長変換特性を制御し得る。波長変換材料は、例えば量子ドットであってもよく蛍光体であってもよい。1つの実施形態においては、第1の波長変換材料および第2の波長変換材料はいずれも量子ドットであり得る。別の実施形態においては、第1の波長変換材料または第2の波長変換材料の一方は量子ドットであり、他方は蛍光体であり得る。例えば、第1の波長変換材料は量子ドットであり、第2の波長変換材料は蛍光体であり得る。さらに別の実施形態においては、第1の波長変換材料および第2の波長変換材料はいずれも蛍光体であり得る。
量子ドットは、単独で用いてもよく、2種以上(例えば、2種類、3種類、4種類以上)を組み合わせて用いてもよい。例えば、異なる発光中心波長を有する量子ドットを適切に組み合わせて用いることにより、所望の発光中心波長を有する光を実現する粘着剤層を形成することができる。量子ドットの発光中心波長は、量子ドットの材料および/または組成、粒子サイズ、形状等により調整することができる。1つの実施形態においては、2種類の量子ドット(第1の量子ドットおよび第2の量子ドット)が用いられ得る。これらを適切に組み合わせることにより、所定の波長の光(バックライト光源からの光)を粘着剤層に入射および通過させると、所望の波長帯域に発光中心波長を有する光を実現することができる。例えば、第1の量子ドットは好ましくは515nm〜550nmの範囲の波長帯域に発光中心波長を有し、第2の量子ドットは好ましくは605nm〜650nmの範囲の波長帯域に発光中心波長を有する。したがって、第1の量子ドットは、励起光(本発明においては、バックライト光源からの光)により励起され緑色光を発光し、第2の量子ドットは赤色光を発光し得る。このような構成であれば、必要に応じて青色光を発光し得る量子ドットをさらに組み合わせることにより、光漏れをさらに良好に防止することができる。
蛍光体としては、目的に応じて所望の色の光を発光し得る任意の適切な蛍光体を用いることができる。具体例としては、赤色蛍光体、緑色蛍光体が挙げられる。
粘着剤層は、好ましくは、酸素および/または水蒸気に対してバリア機能を有する。粘着剤層は、量子ドット自体に例えばコアシェル型、テトラポッド型のような立体的構造を付与することによりバリア機能を発現し得る。また、粘着剤層は、粘着剤を適切に選択することによりバリア機能を発現し得る。好ましくは、粘着剤層は、有機化処理された層状ケイ酸塩(有機化処理層状ケイ酸塩)を配合することにより、バリア機能を発現し得る。粘着剤層がバリア機能を有することにより、上記の基材のバリア機能との相乗的な効果により、所望の波長変換機能を維持しつつ、非常に優れた耐久性を有する粘着テープを実現することができる。
粘着剤層は、目的に応じて任意の適切な添加材をさらに含んでいてもよい。添加材としては、例えば、光拡散材料、光に異方性を付与する材料、光を偏光化する材料が挙げられる。光拡散材料の具体例としては、アクリル系樹脂、シリコーン系樹脂、スチレン系樹脂、またはこれらの共重合系樹脂で構成される微粒子が挙げられる。光に異方性を付与する材料および/または光を偏光化する材料の具体例としては、長軸と短軸で複屈折が異なる楕円球状微粒子、コアシェル型微粒子、積層型微粒子が挙げられる。添加剤の種類、数、配合量等は、目的に応じて適切に設定され得る。
バリア層の厚みは、透過型電子顕微鏡(日立製作所製H−7650)を用いて断面を観察し、測定を行なった。基材および粘着剤層の厚みは膜厚計(Peacock社製デジタルダイアルゲージDG−205)を用いて測定した。
(2)透湿度
JIS K 7129に準拠した測定法によって測定した。具体的には、実施例および比較例で得られた基材またはバリア層付基材を10cmΦの円状に切り出し、測定試料とした。この測定試料について、テクノロックス社製「DELTAPERM」を用いて、40℃、90%RHの試験条件で透湿度を測定した。
(3)波長変換性能(光漏れ防止特性)
市販の液晶表示装置(Samsung社製、商品名「UN65JS9000FXZA」)を分解した。この液晶表示装置の導光板の両端部と接している額縁部分に実施例および比較例で得られた粘着テープを貼り合わせ、液晶表示装置のバックライトを点灯させ、目視にて貼り合わせ部分光漏れの度合いを確認した。
(4)耐久性
上記(3)の粘着テープを貼り合わせた液晶表示装置を85℃、85%RHのオーブンに24時間放置した後、上記(3)と同様にして貼り合わせ部分の光漏れの度合いを測定した。測定した発光強度は、耐久試験前の発光強度を100としたときの相対値に換算した。
さらに、耐久試験後の粘着テープの粘着剤層の状態を目視により観察した。
(バリア層付基材の作製)
基材として市販のPETフィルム(東洋紡社製、商品名「コスモシャイン A4300」、厚み100μm)を用いた。このフィルムの片面にAZO及びSiO2を蒸着し、バリア層(トータル厚み0.06μm)を形成した。得られたバリア層付基材の透湿度は、0.01g/(m2・day)であった。
ゴム系ポリマーとしてポリイソブチレン(PIB)100重量部に、粘着付与剤として水添テルペンフェノール(商品名:YSポリスターTH130、軟化点:130℃、水酸基価:60、ヤスハラケミカル(株)製)を10重量部、緑色の波長変換材料としてInP系のコアからなる粒子径10nm以下、発光中心波長530nmの量子ドットを3重量部、赤色の波長変換材料としてInP系のコアからなる粒子径20nm以下、発光中心波長630nmの量子ドットを0.3重量部配合し、固形分が18重量%になるようにトルエン溶媒にて調整し、波長変換材料を有する粘着剤組成物(溶液)を調製した。
上記で得られたバリア層付基材のバリア層表面に上記で調製した粘着剤をアプリケーターにより塗布し、粘着剤層を形成した。粘着剤層の厚みは50μmであり、透湿度は、10g/(m2・day)であった。このようにして粘着テープを作製した。得られた粘着テープを用いて、上記(3)および(4)の評価を行った。結果を表1に示す。
ゴム系粘着剤の代わりにアクリル系粘着剤を用いて粘着剤層を形成したこと以外は実施例1と同様にして粘着テープを作製した。アクリル系粘着剤は下記のようにして調製した。粘着剤層の厚みは50μmであり、透湿度は5g/(m2・day)であった。
特許第2549388号に記載のアクリルポリマー100重量部に、0.15部のジベンゾイルパーオキシド(日本油脂製(株):ナイパーBO−Y)と、0.02部のトリメチロールプロパンキシレンジイソシアネート(三井武田ケミカル(株):タケネートD110N)と、0.2部のシランカップリング剤(綜研化学株式会社製:A−100,アセトアセチル基含有シランカップリング剤)とを配合して、アクリル系粘着剤とした。アクリルポリマー100重量部に対して、緑色の波長変換材料としてInP系のコアからなる粒子径10nm以下、発光中心波長530nmの量子ドットを3重量部、赤色の波長変換材料としてInP系のコアからなる粒子径20nm以下、発光中心波長630nmの量子ドットを0.3重量部、特開2015−183078号公報の実施例1に記載のナノクレイ(有機化処理層状ケイ酸塩)を10重量部配合し、固形分が18重量%になるようにトルエン溶媒にて調整した。
PETフィルムに蒸着処理を施さなかったこと以外は実施例1と同様にして粘着テープを作製した。基材の透湿度は、11.3g/(m2・day)であった。得られた粘着テープを用いて、実施例1と同様の評価を行った。結果を表1に示す。
表1から明らかなように、本発明の実施例の粘着テープは、優れた光漏れ防止機能と優れた耐久性とを有することがわかる。
20 粘着剤層
31 バリア層
32 バリア層
100 粘着テープ
101 粘着テープ
Claims (8)
- 基材と波長変換機能を有する粘着剤層とを有し、
所定の波長の光を吸収し、該所定の波長とは異なる波長の光を発光し、
該基材の水蒸気透過率が1g/(m2・day)以下である、
粘着テープ。 - 前記粘着剤層が、スチレン系熱可塑性エラストマー、イソブチレン系ポリマーおよびその組み合わせから選択されるゴム系ポリマーを含む、請求項1に記載の粘着テープ。
- 前記粘着剤層が、515nm〜650nmの範囲の波長帯域に発光中心波長を有する少なくとも1つの波長変換材料を含む、請求項1または2に記載の粘着テープ。
- 前記粘着剤層が、第1の波長変換材料および第2の波長変換材料を含む少なくとも2つの波長変換材料を含み、
該第1の波長変換材料が515nm〜550nmの範囲の波長帯域に発光中心波長を有し、該第2の波長変換材料が605nm〜650nmの範囲の波長帯域に発光中心波長を有する、
請求項3に記載の粘着テープ。 - 前記粘着剤層が、有機化処理された層状ケイ酸塩を含む、請求項1から4のいずれかに記載の粘着テープ。
- 前記粘着剤層の厚み50μm換算の水蒸気透過率が、100g/(m2・day)以下である、請求項1から5のいずれかに記載の粘着テープ。
- 前記粘着剤層の厚みが20μm以上である、請求項1から6のいずれかに記載の粘着テープ。
- 波長変換機能を有する液晶表示装置の光漏れ防止用粘着テープであって、
該粘着テープに所定波長の光が入射した際に得られる発光強度が、該液晶表示装置に該所定波長の光が入射した際に該液晶表示装置の波長変換機能により得られる発光強度と同等またはそれ以下である、
粘着テープ。
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- 2017-03-15 US US16/085,845 patent/US20190092983A1/en not_active Abandoned
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WO2019186730A1 (ja) * | 2018-03-27 | 2019-10-03 | 日立化成株式会社 | 波長変換部材、バックライトユニット、画像表示装置及び硬化性組成物 |
JP2020045431A (ja) * | 2018-09-19 | 2020-03-26 | リンテック株式会社 | 電池用粘着シートおよびリチウムイオン電池 |
JP7105152B2 (ja) | 2018-09-19 | 2022-07-22 | リンテック株式会社 | 電池用粘着シートおよびリチウムイオン電池 |
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KR20180121544A (ko) | 2018-11-07 |
US20190092983A1 (en) | 2019-03-28 |
JP6854675B2 (ja) | 2021-04-07 |
TW201736917A (zh) | 2017-10-16 |
TWI630446B (zh) | 2018-07-21 |
WO2017159719A1 (ja) | 2017-09-21 |
CN110352224A (zh) | 2019-10-18 |
KR102324306B1 (ko) | 2021-11-09 |
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