JP6021092B2 - 粘着剤組成物 - Google Patents
粘着剤組成物 Download PDFInfo
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- JP6021092B2 JP6021092B2 JP2015536732A JP2015536732A JP6021092B2 JP 6021092 B2 JP6021092 B2 JP 6021092B2 JP 2015536732 A JP2015536732 A JP 2015536732A JP 2015536732 A JP2015536732 A JP 2015536732A JP 6021092 B2 JP6021092 B2 JP 6021092B2
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Description
[X(YOmRf)n]−
ゲル(gel)含量 = B/A × 100
製造された重合体に架橋剤などを配合して製造された各実施例または比較例のコーティング液(粘着剤組成物)の粘度を、製造時点から各々0時間及び24時間になる時点で測定した後、下記基準によって可使時間特性を評価した。この時、粘度は、コーティング液を250mLのガラスボトル(glass bottle)に約200gの重さで入れた後、23℃に維持された恒温槽に30分間入れて温度平衡になった時に、回転型粘度計(Brookfield viscometer(DV−II+))を利用して信頼区間トークを維持するRPM区間で粘度を測定した。
O:24時間後、製造時点(0時間)対比粘度変化が30%未満
X:24時間後、製造時点(0時間)対比粘度変化が30%以上
実施例及び比較例で製造された粘着シートを眩しさ防止層が形成された偏光板の前記眩しさ防止層にJIS Z 0237によって2kgのローラーで付着した。その後、23℃の温度及び65%の相対湿度で24時間の間保管した後、横の長さが25mmであり、縦の長さが120mmになるように裁断して試片を製造した。その後、試片をガラス基板に固定し、引張試験機を利用して180度の剥離角度及び0.3m/minの剥離速度で、粘着シートを横方向に眩しさ防止層から剥離しながら剥離力を測定した。剥離力は、2個の同一な試片に対して測定した後、その平均値を採用した。
実施例及び比較例で製造された粘着シートを眩しさ防止層が形成された偏光板の前記眩しさ防止層にJIS Z 0237によって2kgのローラーで付着した。その後、23℃の温度及び65%の相対湿度で24時間の間保管した後、横の長さが25mmであり、縦の長さが250mmになるように裁断して試片を製造した。その後、試片をガラス基板に固定し、引張試験機を利用して180度の剥離角度及び30m/minの剥離速度で、粘着シートを横方向に眩しさ防止層から剥離しながら剥離力を測定した。剥離力は、2個の同一な試片に対して測定した後、その平均値を採用した。
低速及び高速剥離力の測定で使用したものと同一であるが、横の長さが約22cmであり、縦の長さが約25cmである試片を製造した。その後、試片をガラス基板に固定し、試片の粘着シートを引張試験機で約180度の剥離角度及び40m/minの剥離速度で剥離しながら剥離帯電圧を測定した。
低速剥離力の測定時に使用したものと同一な試片で粘着シートを剥離した後、被着体の表面に静電気による染みが発生するか否かを観察して、下記基準によって評価した。
A:被着体の表面で染みが発生しない場合
B:被着体の表面で染みが発生した場合
窒素ガスが還流され、温度調節が容易に冷却装置を設置した1L反応機に、2−エチルヘキシルアクリレート(2−EHA)85重量部、4−ヒドロキシブチルアクリレート(4−HBA)2重量部、2−ヒドロキシエチルアクリレート(2−HEA)5重量部、ジメチルアクリルアミド3重量部及びポリエチレングリコールモノメチルエーテルメタクリレート(エチレンオキサイド単位付加モル数:9モル)5重量部を投入し、溶剤としてエチルアセテート100重量部を投入した。その後、窒素ガスを1時間の間パージング(purging)して酸素を除去し、反応開始剤(AIBN:azobisisobutyronitrile)を投入して約8時間の間反応させた後に、反応物をエチルアセテートで希釈してアクリル重合体(A)を製造した。
重合体の製造時に単量体の割合を下記表1及び表2のように変更したこと以外は、製造例1と同一にアクリル重合体を製造した。
粘着剤組成物の製造
製造例1のアクリル重合体(A)100重量部に対して、架橋剤としてイソボロンジイソシアネート系架橋剤及びヘキサメチレンジイソシアネート系架橋剤の混合物(MHG−80B、Asahi社製)5.0重量部及びLiTFSi(lithium bis(trifluoromethanesulfonyl)imide)0.5重量部を均一に配合し、コーティング性を考慮して適正濃度に希釈して粘着剤組成物を製造した。
製造された粘着剤組成物をPET(poly(ethylene terephthalate))フィルム(厚さ:38μm)の一面にコーティング及び乾燥し、厚さが約20μmである均一なコーティング層を形成した。その後、約90℃で3分程度維持させて前記コーティング層に架橋反応を誘導して粘着シートを製造した。
粘着剤組成物の組成を下記表3及び表4のように変更したこと以外は、実施例1と同一な方式で粘着剤組成物を製造した。
Claims (18)
- 下記化学式1の単量体の重合単位と、窒素含有単量体の重合単位と、下記化学式2で表示され、下記化学式2のA及びBのアルキレン基が含む炭素の数が1〜3の範囲内である第1単量体の重合単位と、下記化学式2で表示され、下記化学式2のA及びBのアルキレン基が含む炭素の数が4〜8の範囲内である第2単量体の重合単位と、を含み、前記第1単量体の重合単位の重量(A)と前記第2単量体の重合単位の重量(B)の割合(A/B)が1であるか、又は1を超過する重合体;イオン性化合物を含む粘着剤組成物。
- 窒素含有単量体は、ジアルキル(メタ)アクリルアミドである請求項1に記載の粘着剤組成物。
- 重合体は、化学式1の単量体0.1〜6.0重量部の重合単位、窒素含有単量体1〜30重量部の重合単位、第1単量体0.1〜15重量部の重合単位及び第2単量体0.1〜5重量部の重合単位を含む請求項1に記載の粘着剤組成物。
- 下記化学式3の化合物をさらに含む請求項1に記載の粘着剤組成物。
- 化学式3で、R1は、水素原子、炭素数1〜8のアルキル基、炭素数4〜16のアルコキシ基であり、R2及びR3は、各々独立的に炭素数1〜12のアルキル基であり、Lは、炭素数4〜12のアルキレン基または炭素数2〜10のアルキリデン基である請求項4に記載の粘着剤組成物。
- 化学式3の化合物は、ビス(1,2,2,6,6−ペンタメチル−4−ピペリジル)セバシン酸、メチル1,2,2,6,6−ペンタメチル−4−ピペリジルセバシン酸、プロパン二酸2−[[3,5−ビス(1,1−ジメチルエチル)−4−ヒドロキシフェニル]メチル]−2−ブチル−1,3−ビス(1,2,2,6,6−ペンタメチル−4−ピペリジニル)エステル、ビス(2,2,6,6−テトラメチルー4−ピペリジル)セバシン酸またはビス(1−オクチルオキシ−2,2,6,6−テトラメチルー4−ピペリジニル)セバシン酸である請求項4に記載の粘着剤組成物。
- 化学式3の化合物は、重合体100重量部に対して、0.01〜10重量部で含まれる請求項4に記載の粘着剤組成物。
- 脂肪族イソシアネート架橋剤をさらに含む請求項1に記載の粘着剤組成物。
- 架橋剤は、脂肪族環型イソシアネート化合物及び脂肪族非環型イソシアネート化合物からなる群より選択された一つ以上を含む請求項8に記載の粘着剤組成物。
- 脂肪族環型イソシアネート化合物が、イソホロンジイソシアネート、メチレンジシクロ
キシルジイソシアネートまたはシクロヘキサンジイソシアネートであるイソシアネート化合物;前記イソシアネート化合物の二量体または三量体;または前記イソシアネート化合物とポリオールの反応物である請求項9に記載の粘着剤組成物。 - 脂肪族非環型イソシアネート化合物が、炭素数1〜20のアルキレンジイソシアネート化合物;前記イソシアネート化合物の二量体または三量体;または前記イソシアネート化合物とポリオールの反応物である請求項9に記載の粘着剤組成物。
- 架橋剤は、重合体100重量部に対して、0.01重量部〜10重量部で含まれる請求項8に記載の粘着剤組成物。
- 表面保護基材層;及び前記基材層の一面または両面に形成されており、架橋された状態の請求項1に記載の粘着剤組成物を含む粘着剤層を含む表面保護フィルム。
- 表面エネルギーが30mN/m以下である被着体に対して、180度の剥離角度及び0.3m/minの剥離速度で測定した粘着剤層の剥離力が、1gf/25mm〜40gf/25mmの範囲内である請求項13に記載の表面保護フィルム。
- 表面エネルギーが30mN/m以下である被着体に対して、180度の剥離角度及び30m/minの剥離速度で測定した粘着剤層の剥離力が、10gf/25mm〜300gf/25mmの範囲内である請求項13に記載の表面保護フィルム。
- 請求項13に記載の保護フィルムが表面に剥離可能に付着されている光学素子。
- 保護フィルムが付着されている表面の表面エネルギーが、30mN/m以下である請求項16に記載の光学素子。
- 請求項16に記載の光学素子を含むディスプレイ装置。
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