JP6451976B2 - 粘着テープ、滑り防止材、液晶表示モジュール及び液晶表示装置 - Google Patents
粘着テープ、滑り防止材、液晶表示モジュール及び液晶表示装置 Download PDFInfo
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- JP6451976B2 JP6451976B2 JP2014148731A JP2014148731A JP6451976B2 JP 6451976 B2 JP6451976 B2 JP 6451976B2 JP 2014148731 A JP2014148731 A JP 2014148731A JP 2014148731 A JP2014148731 A JP 2014148731A JP 6451976 B2 JP6451976 B2 JP 6451976B2
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- liquid crystal
- crystal display
- adhesive tape
- pressure
- polyurethane foam
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- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- QYZFTMMPKCOTAN-UHFFFAOYSA-N n-[2-(2-hydroxyethylamino)ethyl]-2-[[1-[2-(2-hydroxyethylamino)ethylamino]-2-methyl-1-oxopropan-2-yl]diazenyl]-2-methylpropanamide Chemical compound OCCNCCNC(=O)C(C)(C)N=NC(C)(C)C(=O)NCCNCCO QYZFTMMPKCOTAN-UHFFFAOYSA-N 0.000 description 1
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Images
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Description
次に、本発明の粘着テープを構成する粘着剤層について説明する。前記粘着剤層は、は前記ポリウレタン発泡体の一方の面に積層された前記樹脂フィルムの表面に設けられる。
サンプル注入量:100μl
溶離液:テトラヒドロフラン
流速:1.0ml/分
測定温度:40℃
本カラム:TSKgel GMHHR−H(20)2本
ガードカラム:TSKgel HXL−H
検出器:示差屈折計
スタンダードポリスチレン分子量:1万〜2000万(東ソー株式会社製)
本発明の粘着テープの実施形態としては、例えばポリウレタン発泡体の片面または両面に、直接または他の層を介して樹脂フィルムが積層したものを基材とし、前記樹脂フィルムの上に粘着剤層が積層されたものを基本構成とする。前記樹脂フィルムは、前記ポリウレタン発泡体の片面に直接積層されることが好ましい。
ポリウレタン発泡体1の片面にポリエチレンテレフタレートフィルム(PETフィルム)が積層された複合基材1(ポリウレタン発泡体1層:厚さ450μm、密度0.4g/cm3、PETフィルム:厚さ50μm、その両面のぬれ指数56mN/m)を用意した。
[実施例2]
ポリウレタン発泡体2の片面にポリエチレンテレフタレートフィルム(PETフィルム)が積層された複合基材2(ポリウレタン発泡体2層:厚さ250μm、密度0.48g/cm3、PETフィルム:厚さ50μm、その両面のぬれ指数56mN/m)を用意した。
攪拌機、還流冷却器、温度計、滴下漏斗及び窒素ガス導入口を備えた反応容器に、ブチルアクリレート60質量部、2−エチルヘキシルアクリレート35.95質量部、アクリル酸4.0質量部、4−ヒドロキシブチルアクリレート0.05質量部と、重合開始剤として2,2’−アゾビスイソブチルニトリル0.2質量部とを、酢酸エチル50質量部及びトルエン20質量部の混合溶剤に溶解し、それらを80℃で8時間重合させることによって、重量平均分子量80万のアクリル共重合体溶液を得た。
イソシアネート系架橋剤(DIC株式会社製、バーノックNC−40、固形分40質量%、酢酸エチル溶液)の使用量を1.7質量部から2.0質量部に変更したこと以外は実施例1と同様の方法で粘着テープを得た
[比較例1]
前記複合部材1の代わりに、ポリウレタン発泡体(厚さ450μm、密度0.4g/cm3)を使用すること以外は、実施例1と同様の方法で粘着テープを得た。
前記ポリウレタン発泡体の代わりに、ポリエチレン発泡体(厚さ500μm、密度0.11g/cm3)を使用すること以外は、実施例1と同様の方法で粘着テープを得た。
前記複合部材1の代わりに、シリコーンゴムシート(信越シリコーン株式会社製、KR951、厚さ500μm、無発泡)を使用すること以外は、実施例1と同様の方法で粘着テープを得た。
前記粘着テープの製造に使用した発泡体、シリコーンゴムシート、及び、前記ポリウレタン発泡体の片面にPETフィルムが積層された基材の圧縮残留歪みは、JISK6401に準じて測定した。具体的には、発泡体等の厚さを測定した後、発泡体等を治具に挟み、50%の厚さになるまで圧縮させ、70℃雰囲気下に22時間放置した。
[{(前記圧縮前の発泡体等の厚さ)−(前記圧縮後の発泡体等の厚さ)}/(前記圧縮前の発泡体等の厚さ)]×100
[25%圧縮強さ]
発泡体、シリコーンゴムシート、及び、前記ポリウレタン発泡体の片面にPETフィルムが積層された基材の25%圧縮強さは、JISK6254に準じて測定した。具体的には、温度23℃及び湿度50%RHの雰囲気下で、直径50mmの円形状に裁断した発泡体等を試験装置に設置し、先端に直径50mmの円形の底面を有する治具を装着したロードセルで速度1mm/分で発泡体等を圧縮し、元の発泡体等の厚さの25%の厚さ分を圧縮させた際の強度を測定する。測定した強度を発泡体等の断面積で除して求めた。
発泡体及びシリコーンゴムシートの表面の静摩擦係数は、JISK7125に準じて測定した。具体的には、温度23℃及び湿度50%RHの雰囲気下で、水平に置かれたガラス板の上に、80mm角の正方形状に切断した発泡体等を置き、発泡体等上に63mm角の正方形状の重さ1.96N(200g)の荷重をかけた。荷重の先にはロードセルを接続した。前記荷重を発泡体等の上に置いてから15秒経過後に、前記荷重を水平方向に200mm/分の速度で引張り、その強度を測定した。前記強度を前記荷重で除した値を前記静摩擦係数とした。
実施例及び比較例で得た粘着テープを、長さ5cm及び幅5cmの大きさに裁断したものを試験片とした。
粘着テープを幅25mm、長さ100mmに切断したものを試験片とした。
粘着テープを幅25mm、長さ100mmに切断したものを試験片とした。
対角線の長さが32インチであり、厚さが4mmであるアルミニウム板1を、テレビ等の画像表示装置を構成するフレームとした。前記アルミニウム板1の4辺に、幅5mm及び長さ38cm、幅5mm及び長さ68cmに裁断した粘着テープ2を貼付した。その表面(具体的には、前記ポリウレタン発泡体またはポリエチレン発泡体またはシリコーンゴムシートの表面)に、画像表示パネルに仮定した対角線の長さが32インチで、厚さが5mmであるガラス板3を載置し、それを構成する粘着テープ2の厚さに対し5%圧縮した状態を保持したものを積層体とした。
粘着テープを幅5mm及び長さ30cmの大きさに裁断したものを試験片とした。
2 ガラス板
3 粘着テープ
4 おもり
Claims (8)
- ポリウレタン発泡体の片面に樹脂フィルム層を有し、前記樹脂フィルム層の表面に粘着剤層を有し、前記ポリウレタン発泡体の片面に樹脂フィルム層を有する基材を、70℃の環境下で、厚さ方向に50%圧縮させたときの圧縮残留歪みが10%以下であり、前記ポリウレタン発泡体の表面の、ガラス板に対する静摩擦係数が10以上であることを特徴とする粘着テープ。
- 前記ポリウレタン発泡体の片面に樹脂フィルム層を有する基材の、25%圧縮強さが40kPa〜100kPaである請求項1に記載の粘着テープ。
- 前記粘着剤層が、アクリル重合体と架橋剤と非芳香族系溶剤とを含有する粘着剤を用いて形成される層である請求項1または2に記載の粘着テープ。
- 前記粘着剤層が、ゲル分率30質量%〜70質量%の範囲のゲル分率を有するものである請求項1〜3のいずれか1項に記載の粘着テープ。
- 前記ポリウレタン発泡体の厚さが0.2〜2.0mmであり、前記樹脂フィルム層の厚さが25μm〜75μmの範囲であり、かつ、前記粘着剤層の厚さが20μm〜80μmである請求項1〜4のいずれか1項に記載の粘着テープ。
- 請求項1〜5のいずれか1項に記載の粘着テープからなる滑り防止材。
- 液晶表示パネルと、フレーム部材と、バックライトユニットとを備えた液晶表示モジュールであって、前記フレーム部材の一部に請求項6に記載の滑り防止材が貼付され、それを構成する前記ポリウレタン発泡体の表面に前記液晶表示パネルが配置された構成を有することを特徴とする液晶表示モジュール。
- 請求項7に記載の液晶表示モジュールを備えた液晶表示装置。
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