JP6371921B1 - 光学透明粘着シート、光学透明粘着シートの製造方法、積層体、及び、貼り合わせ構造物 - Google Patents
光学透明粘着シート、光学透明粘着シートの製造方法、積層体、及び、貼り合わせ構造物 Download PDFInfo
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- JP6371921B1 JP6371921B1 JP2017565328A JP2017565328A JP6371921B1 JP 6371921 B1 JP6371921 B1 JP 6371921B1 JP 2017565328 A JP2017565328 A JP 2017565328A JP 2017565328 A JP2017565328 A JP 2017565328A JP 6371921 B1 JP6371921 B1 JP 6371921B1
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- Prior art keywords
- adhesive sheet
- transparent adhesive
- optically transparent
- thermosetting polyurethane
- polyisocyanate
- Prior art date
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Abstract
Description
また、本発明の光学透明粘着シートの製造方法によれば、上記光学透明粘着シートを好適に製造することができる。本発明の積層体によれば、本発明の光学透明粘着シートの取扱い性を向上することができる。本発明の貼り合わせ構造物によれば、透明で気泡のない貼り合わせ界面を維持することができる。
上記ポリオール成分としては特に限定されず、例えば、ポリエーテルポリオール、ポリカプロラクトンポリオール、ポリカーボネートポリオール、ポリエステルポリオール等が挙げられる。これらは単独で用いてもよいし、2種類以上を併用してもよい。
上記ポリイソシアネート成分は、親水性ユニット(親水基)を有するポリイソシアネート、及び、親水性ユニットを有さないポリイソシアネートの両方を含む。親水性ユニットを有するポリイソシアネートを用いる場合には、吸湿が生じやすいので、高温高湿試験後の吸湿率を調整することが特に重要となる。
上記熱硬化性ポリウレタン組成物は、更に、タッキファイヤー(粘着付与剤)を含有してもよい。タッキファイヤーは、粘着力を向上するために添加される添加剤であり、通常、分子量が数百〜数千の無定型オリゴマーで、常温で液状又は固形の熱可塑性樹脂である。熱硬化性ポリウレタン組成物がタッキファイヤーを含有することで、熱硬化性ポリウレタン組成物の硬化物からなる光学透明粘着シートの粘着力を向上させることができる。
上記熱硬化性ポリウレタン組成物は、更に、可塑剤を含有してもよい。可塑剤の添加により、低硬度化されることで、本発明の光学透明粘着シートの取り扱い性や段差追従性を向上することができる。なお、可塑剤の添加により粘着力は低下するおそれがあるが、本発明の光学透明粘着シートによれば、多少粘着力が低下しても充分な粘着力を確保できる。
上記熱硬化性ポリウレタン組成物は、更に、触媒を含有してもよい。触媒としては、ウレタン化反応に用いられる触媒であれば特に限定されず、例えば、ジラウリル酸ジ−n−ブチル錫、ジラウリル酸ジメチル錫、ジブチル錫オキシド、オクタン錫等の有機錫化合物;有機チタン化合物;有機ジルコニウム化合物;カルボン酸錫塩;カルボン酸ビスマス塩;トリエチレンジアミン等のアミン系触媒が挙げられる。
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)」、数平均分子量:2500)
(B)ポリイソシアネート成分
・HDI(ヘキサメチレンジイソシアネート)モノマー
・HDI系ポリイソシアネート(東ソー社製の「コロネート2760」)
・親水性ユニットを有する変性ポリイソシアネート(東ソー社製の「コロネート4022」)
・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)タッキファイヤー
・水添石油樹脂系タッキファイヤー(出光興産社製の「アイマーブP−100」)
(D)触媒
ジラウリル酸ジメチル錫(Momentive社製の「Fomrez catalyst UL−28」)
まず、120℃に温調したポリオレフィンポリオールに、固形状の水添石油樹脂系タッキファイヤーを添加し、攪拌することによって、ポリオレフィンポリオール中にタッキファイヤーを溶解させたタッキファイヤーマスターバッチを得た。タッキファイヤーマスターバッチ中のタッキファイヤーの含有量は30重量%に調整した。
下記表1〜3に示したように配合及びシート厚みを変更したことを除いて実施例1と同様にして、実施例2〜25及び比較例1〜8に係る離型フィルム付き光学透明粘着シートをそれぞれ作製した。
下記の方法により、実施例及び比較例で作製した光学透明粘着シートの物性確認や評価試験を行った。下記表1〜3に結果を示した。
70℃に調節した加熱装置から温度25℃、湿度40%の環境下へ取り出し、直ちに離型フィルム付き光学透明粘着シートから両面の離型フィルムを剥離し、一方の面にガラス板が貼り付けられ、他方の面が露出した状態の光学透明粘着シートを、各実施例及び比較例につき、2つずつ準備した。そして、光学透明粘着シートを温度85℃、湿度85%の高温高湿環境に3時間暴露した。暴露の前後で各光学透明粘着シートの重量を測定し、以下の式から吸湿率を求めた。
吸湿率(ppm)=(暴露後重量−暴露前重量)/(暴露前重量)
なお、吸湿率は、ガラス板の重量を除いて、光学透明粘着シート単独の重量に基づいて算出した。
アントンパール社(Anton Paar Germany GmbH)製の粘弾性測定装置「Physica MCR301」を用いて、光学透明粘着シートの貯蔵せん断弾性率を測定した。測定プレートは、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)とした。下記表1〜3には、85℃における貯蔵せん断弾性率の測定値を記載した。
下記の方法で180°剥離試験を行い、粘着力(N/25mm)を測定した。図4は、実施例及び比較例の光学透明粘着シートの粘着力の評価方法を説明するための模式図である。まず、離型フィルム付き光学透明粘着シートを、長さ75mm×幅25mmに裁断し、試験片とした。この試験片の片面の離型フィルムを剥離した後、光学透明粘着シート12側を、長さ75mm×幅25mmのスライドガラス31に貼り付け、圧力0.4MPaで30分間保持し、光学透明粘着シート12とスライドガラス31とを貼り合わせた。次に、スライドガラス31とは反対側の離型フィルムを剥離し、図4(a)に示すように、光学透明粘着シート12のスライドガラス31とは反対側の面に、厚み125μmのPETシート(帝人デュポンフィルム社製の「メリネックス(登録商標)S」)32を貼り合わせた。
離型フィルム付き光学透明粘着シートの片面の離型フィルムを剥離した後、光学透明粘着シート側をスライドガラス(ソーダガラス製)に貼り付け、圧力0.4Mpaで30分間保持し、光学透明粘着シートとスライドガラスとを貼り合わせた。その後、スライドガラスとは反対側の離型フィルムを剥離し、高温・高湿下(85℃、85%)で168時間放置した後、光学透明粘着シートの外観を目視で観察し、下記基準で判定した。
〇:白化の発生無し
×:白化の発生有り
離型フィルム付き光学透明粘着シートの片面の離型フィルムを剥離した後、光学透明粘着シート中に飽和状態まで吸湿させるため、高温・高湿下(85℃、85%)で3時間放置した。次に、真空貼り合わせ機にて、カバーガラスと貼り合わせた。続いて、カバーガラスとは反対側の離型フィルムを剥離した後、光学透明粘着シート中の水分を気化させるため、光学透明粘着シートをオーブンに入れ、高温・常湿下(95℃)に1日間放置した。なお、高温・常湿条件では、送風オーブンにより温度のみを95℃に設定し、湿度の設定はしなかった。オーブンから取り出したカバーガラスと光学透明粘着シートの界面を目視で観察し、下記基準で判定した。
〇:剥がれ(浮き)の発生無し
×:剥がれ(浮き)の発生有り
離型フィルム付き光学透明粘着シートの片面の離型フィルムを剥離した後、光学透明粘着シート側をスライドガラス(ソーダガラス製)に貼り付け、圧力0.4Mpaで30分間保持し、光学透明粘着シートとスライドガラスとを貼り合わせた。その後、常温・常湿の室内環境に24時間放置した。その後、光学透明粘着シートをオーブンに入れ、高温・常湿下(85℃)に300時間放置した。オーブンから取り出した光学透明粘着シートについて、シート形状の変化の有無を目視で確認し、下記基準で判定した。
〇:シート形状の変化無し
×:シート形状の変化有り
離型フィルム付き光学透明粘着シートの片面の離型フィルムを剥離した後、光学透明粘着シートを、φ100〜200μmのガラスビーズを小さじ1杯散布したガラス板上に真空貼合機で貼り合せた。その後、ガラス板及び光学透明粘着シートを高温・常湿下(85℃)に1日間放置した。放置後のガラス板と光学透明粘着シートとの界面を、ビデオマイクロ計を用いて倍率100倍で観察した。観察結果について、下記基準で判定した。なお、下記「独泡」とは、ガラス板と光学透明粘着シートとの界面に発生した気泡であって、個々のガラスビーズの周囲に形成された点状のものを指す。また、下記「連泡」とは、複数の独泡同士がつながって形成された気泡を指す。
○:独泡及び連泡が発生していなかった
△:独泡が発生していた
×:連泡が発生していた
11 表示パネル
11A ベゼル
12 光学透明粘着シート
13 タッチパネル
14 透明カバーパネル
20 成形装置
21 離型フィルム
22 成型ロール
23 熱硬化性ポリウレタン組成物
24 加熱装置
31 スライドガラス
32 PETシート
Claims (7)
- 熱硬化ポリウレタンで構成された光学透明粘着シートであって、
前記熱硬化ポリウレタンは、ポリオール成分及びポリイソシアネート成分を含有する熱硬化性ポリウレタン組成物の硬化物であり、
前記ポリイソシアネート成分は、エチレンオキシドユニットを有するポリイソシアネート、及び、エチレンオキシドユニットを有さないポリイソシアネートの両方を含み、
温度85℃、湿度85%の高温高湿環境下に3時間投入する試験を実施した場合に、吸湿率が3600ppm以下であることを特徴とする光学透明粘着シート。 - 85℃での貯蔵せん断弾性率が4×103Pa以上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。
- 前記エチレンオキシドユニットを有さないポリイソシアネートは、脂肪族系イソシアネート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。
- 前記ポリオール成分は、オレフィン骨格を有するものであることを特徴とする請求項1〜3のいずれか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を製造する方法であって、
ポリオール成分及びポリイソシアネート成分を攪拌混合して熱硬化性ポリウレタン組成物を調製する工程と、
前記熱硬化性ポリウレタン組成物を硬化する工程とを含むことを特徴とする光学透明粘着シートの製造方法。 - 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、前記第一の被着体と前記第二の被着体とを接合する請求項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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