JP7064061B1 - 光学透明粘着シート、積層体、及び、貼り合わせ構造物 - Google Patents
光学透明粘着シート、積層体、及び、貼り合わせ構造物 Download PDFInfo
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- JP7064061B1 JP7064061B1 JP2021568430A JP2021568430A JP7064061B1 JP 7064061 B1 JP7064061 B1 JP 7064061B1 JP 2021568430 A JP2021568430 A JP 2021568430A JP 2021568430 A JP2021568430 A JP 2021568430A JP 7064061 B1 JP7064061 B1 JP 7064061B1
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Abstract
Description
本発明の光学透明粘着シートは、第一の表面粘着剤層と、中間ポリウレタン層と、第二の表面粘着剤層とをこの順に有する光学透明粘着シートであって、上記中間ポリウレタン層は、ヒンダードアミン系光安定剤を含有し、上記光学透明粘着シートの85℃における損失正接は、0.25以上、0.6以下であり、上記中間ポリウレタン層の厚みは、100μm以上、2000μm以下であることを特徴とする。
第一の表面粘着剤層11及び第二の表面粘着剤層13は、ともに光学透明粘着シート10の最表面を構成する層である。第一の表面粘着剤層11及び第二の表面粘着剤層13は、アクリル系樹脂を含有する層であることが好ましい。上記アクリル系樹脂は、アクリル系樹脂組成物を硬化させたものである。上記アクリル系樹脂組成物としては、例えば、(メタ)アクリル酸エステル系重合体、又は、これらの共重合体(以下、(メタ)アクリル系共重合体ともいう)と、架橋剤とを含有するもの挙げられる。
中間ポリウレタン層12は、ポリウレタンを含有する層である。中間ポリウレタン層12がポリウレタンを含有することで、透明性及び追従性に優れた光学透明粘着シート10を得ることができる。ポリウレタンは、柔軟であるため、本発明の光学透明粘着シート10は、引っ張り応力が加わったときに、良く伸び、非常に千切れにくい。このため、糊残りすることなく、引き剥がすことが可能である。さらに、ポリウレタンは誘電率が高いため、光学透明粘着シート10は高い静電容量を備えたものとなり、静電容量方式のタッチパネルの貼り合わせに好適に用いることができる。
光学透明粘着シート10の85℃における損失正接は、0.25以上、0.6以下である。損失正接(tanδ)は、物質の弾性(貯蔵弾性率)と粘性(損失弾性率)の比(tanδ=損失弾性率/貯蔵弾性率)で定義される。光学透明粘着シート10の損失正接が低い、すなわち、光学透明粘着シート10が弾性体(剛体)に近い場合、外力に対して変形し難くなり、ディレイバブルの抑制効果が向上するが、被着体の形状に追従する段差追従性は低下する。一方で、光学透明粘着シート10の損失正接が高い、すなわち、光学透明粘着シート10が粘性体に近い場合は、段差追従性は向上するものの、ディレイバブルの抑制効果が低下する。そこで、光学透明粘着シート10の85℃における損失正接は、0.25以上、0.6以下とすることで、85℃の高温環境下において、優れた段差追従性とディレイバブルの抑制効果とを両立することができる。光学透明粘着シート10の85℃における損失正接は、後述する中間ポリウレタン層のα比(ポリオール成分由来のOH基のモル数/ポリイソシアネート成分由来のNCO基のモル数)を調整することで制御することができる。
第一の表面粘着剤層11と、中間ポリウレタン層12と、第二の表面粘着剤層13とをこの順に積層する方法としては特に限定されず、例えば、第一の表面粘着剤層11、第二の表面粘着剤層13及び中間ポリウレタン層12を個別に作製した後、これらを貼り合わせる方法が挙げられる。
本発明の光学透明粘着シートの両面には離型フィルムが貼り付けられてもよい。図2は、本発明の積層体の一例を模式的に示した断面図である。本発明の光学透明粘着シート10と、光学透明粘着シート10の一方の面を覆う第一の離型フィルム21と、光学透明粘着シート10の他方の面を覆う第二の離型フィルム22とが積層された積層体20(以下、「本発明の積層体」とも言う)もまた、本発明の一態様である。本発明の積層体によれば、第一の離型フィルム及び第二の離型フィルムによって、本発明の光学透明粘着シートの両面を、被着体に貼り付ける直前まで保護することができる。これにより、本発明の光学透明粘着シートに対する、粘着性の低下、及び、異物の付着が防止される。また、本発明の光学透明粘着シートが被着体以外に貼り付いてしまうことも防止されるため、取り扱い性が高まる。
第一の被着体と、第二の被着体と、上記第一の被着体及び上記第二の被着体を接合する本発明の光学透明粘着シートとを備える貼り合わせ構造物(以下、「本発明の貼り合わせ構造物」とも言う)もまた、本発明の一態様である。
下記の実施例及び比較例において、熱硬化性ポリウレタン組成物を調製するために用いた配合原料は以下の通りである。
(A)ポリオール成分
ポリオレフィンポリオール(出光興産社製の「EPOL(エポール、登録商標)」)
(B)ポリイソシアネート成分
(B-1)親水性ポリイソシアネート
エチレンオキシドユニットを含む変性ポリイソシアネート(東ソー社製の「コロネート4022」)
(B-2)疎水性ポリイソシアネート
IPDI(イソホロンジイソシアネート)系ポリイソシアネート(住化バイエルウレタン社製の「デスモジュールI」)
(C)ヒンダードアミン系光安定剤(HALS)
HALS-1:ADEKA社製の「アデカスタブLA-81」
HALS-2:ADEKA社製の「アデカスタブLA-63P」
HALS-3:ADEKA社製の「アデカスタブLA-72」
(D)紫外線吸収剤
ベンゾトリアゾール系紫外線吸収剤(ADEKA社製の「アデカスタブLA-36」)
(E)タッキファイヤー
出光興産社製の「アイマーブP-100」
(F)触媒
ジラウリル酸ジメチル錫(Momentive社製の「Fomrez catalyst UL-28」)
<中間ポリウレタン層>
下記表1に示したように、ポリオール成分100重量部、親水性ポリイソシアネート4.7重量部、疎水性ポリイソシアネート4.7重量部、ヒンダードアミン系光安定剤としてアデカスタブLA-81を0.45重量部、タッキファイヤー10重量部及び触媒0.01重量部を、往復回転式撹拌機アジターを用いて攪拌混合し、α比が1.5である熱硬化性ポリウレタン組成物を調製した。なお、熱硬化性ポリウレタン組成物において、(B-1)親水性ポリイソシアネートと(B-2)疎水性ポリイソシアネートとの混合比(重量比)は、B-1:B-2=1:1であった。
アクリル系樹脂(綜研化学社製の「SK1838」と「SK1875」を固形分比5:5となるようにブレンドしたもの)100重量部に、イソシアネート系硬化剤(綜研化学社製の「DY-70」)を0.6重量部添加し、アクリル系樹脂組成物を作製した。得られたアクリル系樹脂組成物を離型フィルムにコンマコーターにて塗工し、80~120℃の乾燥炉において乾燥した後、塗工面に離型フィルムを重ねた。その後、40℃で1週間加熱することにより硬化を完了させ、アクリル粘着剤層を作製した。アクリル粘着剤層の厚みは25μmであった。
上記離型フィルム付きアクリル粘着剤層を二枚と、上記離型フィルム付き熱硬化ポリウレタン層(中間ポリウレタン層)を一枚準備した。二枚の離型フィルム付きアクリル粘着剤層から、それぞれ一方の離型フィルムを剥離し、熱上記離型フィルムを剥離した面が、中間ポリウレタン層の表面と接するように積層した。これにより、第一の表面粘着剤層と、中間ポリウレタン層と、第二の表面粘着剤層とをこの順に有する実施例1に係る光学透明粘着シート、及び、光学透明粘着シートの両面に離型フィルムが配置された実施例1に係る積層体を作製した。
ヒンダードアミン系光安定剤としてアデカスタブLA-63Pを0.3重量部添加したこと以外は、実施例1と同様にして、実施例2に係る光学透明粘着シート及び積層体を作製した。
ヒンダードアミン系光安定剤としてアデカスタブLA-72を0.3重量部添加したこと以外は、実施例1と同様にして、実施例3に係る光学透明粘着シート及び積層体を作製した。
ヒンダードアミン系光安定剤を添加しなかったこと以外は、実施例1と同様にして、比較例1に係る光学透明粘着シート及び積層体を作製した。
ヒンダードアミン系光安定剤の代わりに紫外線吸収剤を添加したこと以外は、実施例1と同様にして、比較例2に係る光学透明粘着シート及び積層体を作製した。
実施例1と同様にして作成した、両面に離型フィルムが設けられた、熱硬化ポリウレタン層(中間ポリウレタン層)を比較例3に係る光学透明粘着シートとした。
熱硬化性ポリウレタン組成物における、α比を下記表1に示したように変更し、85℃における損失正接を、0.7に代えたこと以外は、比較例1と同様にして、比較例4に係る光学透明粘着シート及び積層体を作製した。
長さ20mm×幅20mmの実施例1~3及び比較例1~4に係る光学透明粘着シートについて、アントンパール社(Anton Paar Germany GmbH)製の粘弾性測定装置「Physica MCR302」を用いて、各光学透明粘着シートの損失正接を測定した。測定プレートとしてPP12を用い、測定条件は、ひずみ0.1%、周波数1Hz、セル温度25℃~100℃(昇温速度3℃/分)とし、85℃での損失正接を測定した。
実施例1~3及び比較例1~4で作製した各積層体の一方の離型フィルムを剥離し、各光学透明粘着シートの一方の面と、透明なガラス基材(松波硝子工業社製のソーダガラス)とを、押し圧0.15MPaで真空貼合した。次に、残りの離型フィルムを剥離し、各光学透明粘着シートの他方の面と、厚さ1mmのポリカーボネート基材(ミスミグループ本社製の「樹脂シートPCTSH」)とを、押し圧0.15MPaで真空貼合した。以上により、ポリカーボネート基材とガラス基材とを各光学透明粘着シートによって接合した貼り合わせ構造物を得た。
実施例1~3及び比較例1~4に係る光学透明粘着シートに対し、耐候性試験機(ウェザオメーター)を用いて、光源をメタルウェザー(メタルハライドランプ)、温度を83℃で1週間試験を行った。その後、取り出した各光学透明粘着シートを目視にて確認し、形状変化(溶解)が観察されなかった場合を〇、形状変化が観察された場合を×とした。
実施例1~3及び比較例1~4に係る光学透明粘着シートを、図3に示したように、下ベゼル42と、ガラス基材(第一の被着体51)と、上ベゼル41を含む積層体と、ポリカーボネート基材(第二の被着体52)とを、各光学透明粘着シートに貼り合わせ、押し圧0.1MPaで15秒間、真空貼合し、貼り合わせ構造物を得た。
実施例1~3及び比較例1~4に係る光学透明粘着シートを、湿度85%、温度85℃に設定した試験室に1000時間放置し、その後、室温環境下にてヘイズを測定した。ヘイズの測定には、日本電色工業社製の濁度計「HazeMeter NDH5000」を用いた。
11:第一の表面粘着剤層
11A:厚膜部
11B:端部
12:中間ポリウレタン層
13:第二の表面粘着剤層
20:積層体
21:第一の離型フィルム
22:第二の離型フィルム
31:スライドガラス
32:PETシート
41:上ベゼル(支持部材)
42:下ベゼル
50:貼り合わせ構造物
51:第一の被着体
52:第二の被着体
52A:遮光部
Claims (6)
- 第一の表面粘着剤層と、中間ポリウレタン層と、第二の表面粘着剤層とをこの順に有する光学透明粘着シートであって、
前記中間ポリウレタン層は、ポリオール成分と、ポリイソシアネート成分と、ヒンダードアミン系光安定剤とを含有し、かつ、芳香族置換トリアジンを含む光安定剤を含有せず、
前記ヒンダードアミン系光安定剤は、前記ポリオール成分100重量部に対して、0.1重量部以上、1重量部以下であり、
前記光学透明粘着シートの85℃における損失正接は、0.25以上、0.6以下であり、
前記中間ポリウレタン層の厚みは、100μm以上、2000μm以下であることを特徴とする光学透明粘着シート。 - 前記中間ポリウレタン層は、前記ポリオール成分と、前記ポリイソシアネート成分とを含む熱硬化性ポリウレタン組成物の硬化物であることを特徴とする請求項1に記載の光学透明粘着シート。
- 前記中間ポリウレタン層のα比(ポリオール成分由来のOH基のモル数/ポリイソシアネート成分由来のNCO基のモル数)は、1.0以上、1.8以下であることを特徴とする請求項2に記載の光学透明粘着シート。
- 前記ポリイソシアネート成分は、親水性ポリイソシアネートと疎水性ポリイソシアネートとを含むことを特徴とする請求項2又は3に記載の光学透明粘着シート。
- 請求項1~4のいずれかに記載の光学透明粘着シートと、前記光学透明粘着シートの一方の面を覆う第一の離型フィルムと、前記光学透明粘着シートの他方の面を覆う第二の離型フィルムとが積層されたものであることを特徴とする積層体。
- 第一の被着体と、第二の被着体と、前記第一の被着体及び前記第二の被着体を接合する請求項1~4のいずれかに記載の光学透明粘着シートとを備えることを特徴とする貼り合わせ構造物。
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