JP5711767B2 - 感圧接着剤用カチオン性uv架橋型アクリルポリマー - Google Patents
感圧接着剤用カチオン性uv架橋型アクリルポリマー Download PDFInfo
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- JP5711767B2 JP5711767B2 JP2012557186A JP2012557186A JP5711767B2 JP 5711767 B2 JP5711767 B2 JP 5711767B2 JP 2012557186 A JP2012557186 A JP 2012557186A JP 2012557186 A JP2012557186 A JP 2012557186A JP 5711767 B2 JP5711767 B2 JP 5711767B2
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- sensitive adhesive
- curable pressure
- acrylic polymer
- adhesive
- acrylic
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Description
R2は線状、分枝状、または環状アルキル、またはアルコキシ、アリール、H、ハロゲン、C=O、または共有結合性結合(covalent bond connection)を介した縮合脂環式環としてのR1の一部であり、
R3は(CH2)n、n=0−3であり、
Xはアクリレート、メタクリレートであるか、または−W−Y基{式中、WはO、S、アミド、カーボネート、ウレタン、ウレア、シロキサンまたはそれらの組み合わせであり、Yは−R4−C(R5)=CH2(式中、R4は線状または分枝状C2−10アルキレンまたはC2−10オキシアルキレン、アリーレン、またはそれらの誘導体であり、R5はHまたはCH3である)である}を含有する]。
R1−8は独立してH、Cl、Br、I、F、C1−24アルコキシ、C1−24アルキル、またはアリールであり、R1−8のうちの少なくとも1つは−W−X−Y基{式中、WはC1−12アルキレンまたはC1−12オキシアルキレンであり、Xはカーボネート、ウレタン、ウレア、テトラメチルジシロキサンまたはそれらの組み合わせであり、Yは−R9−C(R10)=CH2(式中、R9は線状または分枝状C2−10アルキレンまたはC2−10オキシアルキレン、アリーレンまたはそれらの誘導体であり、R10はHまたはCH3である)である}を含有しなければならない]。
架橋の程度および光開始剤の効率の指標としてゲル分率の割合を用いた。
2つの加熱可能なロールを備えた実験室塗布機を用いて接着剤を適用した。接着剤を150℃に加熱し、2ミル(51μm)厚シリコーンが被覆されたPET剥離ライナーに塗布した。当該ライナー上の接着剤に、H−バルブ(ヒュージョン・システムズ)の下、15m/分のライン速度にてUV C 257mJ/cm2の線量で照射した。その後、被膜をポリエチレンテレフタレート支持体(マイラー(Mylar)(登録商標)、デュポン社)に積層および転写させ、23℃および50%相対湿度で状態調整した。特記しない限り、接着剤の膜厚は3.5ミル(89μm)であった。
接着剤被膜を、中圧水銀アークランプを用いて硬化させた(IST UV硬化用実験装置を用いた)。UV Cの線量を、EITパワーパック(EIT Power Puck)を用いて測定し、記録した。UV Cは200〜280nmの領域であった。
以下のように改作した試験方法B、PSTC−16に従ってループタックを測定した。ループタック試験機を用いて測定した。上記した方法により、アクリルポリマーの試験試料の全てにUV照射を行った。接着剤は50μmPET被膜裏地に塗布した。長方形試験片の寸法は125mm×24mmであった。
ケムサルタンツ(Chemsultants)(登録商標)ホットメルト・ラミネーター・コーターを用いて接着剤をシリコーンライナー上に被覆重量(20〜100g/m2)被膜の範囲で流延し、(上記のように)硬化させた。硬化した独立フィルムを50μmPET裏地被膜へ転写させた。
硬化させた各試料から機械の塗布方向に25mm×100mm寸法の3つの試料を切り出した。SAFTパネル(鏡面化鋼)をエチルアセテートで清浄にした。試料は、25×25mmの正方形の接着剤が試験パネルと接触するように彫り込み線(engraved line)まで重ねて、鋼パネルに接着させた。真っ直ぐなヘリ付き木製アプリケーター(straight edged wooden applicator)を用いて試験領域を擦り、パネルと試験試料との良好な接触を確保した。試料を試験オーブン中、室温で置いた。加熱プログラムを開始させ、温度が40℃に到達したときに1kgの剪断荷重を印加した。オーブン温度を0.5℃/分で200℃まで昇温させ、破壊温度(SAFT)を記録した。
ステンレス鋼表面からの剪断抵抗を、以下のように改作したFINAT試験法第8により測定した。硬化させた各塗膜から機械方向に25mm×100mm寸法の3つの試料を切り出した。剪断パネル(Shear panels)(プレグリット鋼(pregritted steel))をエチルアセテートで清浄にした。試料は、25×25mmの正方形の接着剤が試験パネルと接触するように彫り込み線まで、鋼パネルに接着させた。真っ直ぐなヘリ付き木製アプリケーターを用いて試験領域を擦り、パネルと試験試料との良好な接触を確保した。試験片を23℃±2℃および50%±5%RHで15分間状態調整した。その後、当該試験片を試験用取り付け具で固定し、1kgまたは2kgの重りを印加した。破壊までの時間を記録した。
試験片を70℃に予備加熱したオーブンに置いたこと、および順応させるために10分間放置したこと以外、剪断抵抗の上記方法に従った。1kgの重りを印加し、破壊までの時間を記録した。
図1に示すように、ブルックフィールドDV−I粘度計により135℃で粘度を測定した。10gの試料をスピンドルNo27により4rpmの速度設定で使用した。
500mLの三つ口丸底フラスコに還流冷却器、追加用漏斗および電磁撹拌機を備え付け、穏やかな窒素流の下に置いた。当該フラスコに1,1,3,3−テトラメチルジシロキサン(TMDS、364mL、2.06mol)を入れた。追加用漏斗にアリルアルコール(20.0g、0.34mol)を入れた。約2mLのアリルアルコールを反応フラスコに添加した。加熱浴温度を50℃まで上げ、その温度で、クロロトリス(トリフェニルホスフィン)ロジウム(40ppmまたは18.7mg)を反応フラスコに添加した。その後、内部の反応温度を70℃に上げた。アリルアルコールを30分間にわたって反応器へ滴加する一方で、反応混合物を内部温度75℃未満に維持した。添加中、定常反応発熱を観察した。添加が完了した後、反応物を70℃で10分間撹拌した。FT−IR分析より、1645cm−1〜1606cm−1でのC=C伸縮バンドの消失により、アリル二重結合が完全に消費されたことが示された。反応物を40℃未満に冷却させ、その温度で、真空下、蒸留により、過剰なTMDSを取り出した。当該TMDSは、GC、1H NMRおよび29Si分析により測定したところ純粋であり、再利用できた。淡黄色オイルを中間体として得た。
3−シクロヘキセン−1−カルボキシアルデヒド(30g、0.27mol)、2−アミノエチルメタクリレートヒドロクロリド(67g、0.4mol)、2−ヒドロペルオキシ−2−メチルプロパン(40mL、0.3mol)、CuI(0.5g、2.7mmol)、AgIO3(0.76g、2.7mmol)およびCaCO3(60g、0.6mol)のアセトニトリル(100mL)溶液を40℃で24時間撹拌した。反応混合物を室温に冷却した。オキソン(330g、0.53mol)および脱イオン水(100mL)を添加し、混合物を室温で3時間撹拌した。反応混合物をトルエンで抽出し、脱イオン水で洗浄した。その後、溶剤を真空下、室温で除去し、生成物を液体として定量的な収率で集めた。この化合物の同定は1H NMRにより行い、以下の構造(1H、式中R=Me)を有していることを確認した。
1−メタノール−3,4−シクロヘキセン(9.6g、86mmol)、メチルメタクリレート(7.5g、87mmol)およびメタンスルホン酸(0.5g、5.2mmol)のトルエン(150mL)溶液を120℃で2時間撹拌した。反応混合物を室温に冷却した。炭酸水素ナトリウム(60g、0.71mol)、オキソン(120g、195mmol)、アセトン(100mL)、および脱イオン水(100mL)を添加し、混合物を室温で3時間撹拌した。反応混合物を1時間静置して相分離させた。水層を除去した。有機層を無水硫酸マグネシウムで乾燥させた後、トルエンを真空下、室温で除去した。最終生成物を淡黄色液体として定量的な収率で集めた。この化合物の同定は1H NMRおよびGC−MSにより行い、以下の構造、すなわち1−メタクリロメチル−3,4−シクロヘキセンエポキシド(1J)の構造、を有していることを確認した。
実施例4で製造されたポリマーの135℃での粘度および硬化した接着剤被膜(2ミル、50μm)のステンレス鋼上での特性を測定した。剪断抵抗は示された重り1kgまたは2kgおよび25×25mm結合領域を用いて測定した。SAFTはPETフィルムおよびアルミニウム箔裏地フィルムの両方を用いて測定した。
ポリマーXIIおよびXIIIを実施例4と同様の方法により調製した。カチオン性光開始剤シアキュアUVI−6976のほかに、モノ置換オキシランモノマーを用いて、ポリマーXIIおよびXIIIを合成した。これらの組成を表3に示す。
実施例4のアクリルポリマー(VIII)(75重量%)、クリスタレックス(Kristalex)(登録商標)F85(イーストマン社、オランダ)(15重量%)、およびEVA28−150(10重量%)を用いて、接着剤配合物を製造した。ステンレス鋼50μmPETを用いて20分間および24時間で測定した剥離接着力の値を表4に示す。
表6に示した実施例の組成を有する第1組の接着剤の被膜を、剥離接着力試験の準備における通常の方法により、剥離ライナー上に25℃、50%RHで塗布し、乾燥させ、UV硬化させた後、PET被膜裏地に積層した。
ポリマーVIII(80重量%)、フォーラル85E(10重量%)およびリコセネ(Licocene)(登録商標)PP1302(クラリアント社)(10重量%)から配合物を製造し、その接着剤特性を表8にまとめた。
Claims (14)
- アクリルポリマーおよびカチオン性光開始剤を含有する紫外線硬化性感圧接着剤であって、前記アクリルポリマーが以下の成分:
(i)式:CH2=CH(R1)(COOR2)(式中、R1はHまたはCH3であり、R2はC1−20アルキル鎖である)のアクリルまたはメタクリル酸誘導体から構成されるアクリルモノマー;
(ii)脂環式エポキシド、またはこれとオキセタンの混合物から選択されるペンダント反応性官能基を含有するモノマーであって、該アクリルポリマー100gあたり0.001〜0.015当量含有されているモノマー;
を含有し、
前記アクリルポリマーが、(a)多官能(メタ)アクリレートを本質的に含まず、(b)0℃未満のTg値および(c)50,000〜1,000,000g/molの重量平均分子量を有し、
前記カチオン性光開始剤が下記の構造を有している紫外線硬化性感圧接着剤:
(式中、RはC 3 H 7 、C 12 H 25 であり、WはS、SO、SO 2 またはCOである)、または
(式中、R 1 およびR 2 は独立してH、CH 3 、C 2 H 5 、C 3 H 7 、C 12 H 25 、OCH 3 、OC 2 H 5 、OC 3 H 7 、またはOC 12 H 25 である)。 - アクリルポリマーおよびカチオン性光開始剤を含有する紫外線硬化性感圧接着剤であって、前記アクリルポリマーが以下の成分:
(i)式:CH2=CH(R1)(COOR2)(式中、R1はHまたはCH3であり、R2はC1−20アルキル鎖である)のアクリルまたはメタクリル酸誘導体から構成されるアクリルモノマー;
(ii)(a)(1)脂環式エポキシド、オキセタン、ベンゾフェノンまたはそれらの混合物および(2)モノ置換オキシランの両方から選択されるペンダント反応性官能基を含有するモノマーであって、(b)該アクリルポリマー100gあたり0.001〜0.015当量含有されているモノマー;
を含有し、
前記アクリルポリマーが、(a)多官能(メタ)アクリレートを本質的に含まず、(b)0℃未満のTg値および(c)50,000〜1,000,000g/molの重量平均分子量を有している紫外線硬化性感圧接着剤。 - 前記(ii)モノマーが該アクリルポリマー100gあたり0.002〜0.010当量含有されている請求項1または2に記載の紫外線硬化性感圧接着剤。
- 前記(ii)モノマーが下記式を有する脂環式エポキシドである請求項1または2に記載の紫外線硬化性感圧接着剤:
[式中、R1はO、S、C=O、または線状、分枝状、または環状アルキレン、またはオキシアルキレン、アリーレンであり、
R2は線状、分枝状、および環状アルキルまたはアルコキシ、アリール、H、ハロゲン、C=O、または共有結合性結合を介した縮合脂環式環としてのR1の一部であり、
R3は(CH2)n、n=0−3であり、
Xはアクリレートもしくはメタクリレートであるか、または−W−Y基{式中、WはO、S、アミド、カーボネート、ウレタン、ウレア、シロキサンまたはそれらの組み合わせであり、Yは−R4−C(R5)=CH2(式中、R4は線状または分枝状C2−10アルキレン、C2−10オキシアルキレン、C=O、もしくはアリーレンまたはそれらの誘導体であり、R5はHまたはCH3である)である}を含有する]。 - 前記(ii)ペンダント反応性官能基を含有するモノマーが下記式を有するベンゾフェノンである請求項2に記載の紫外線硬化性感圧接着剤:
[式中、ZはS、O、CH2、またはNHであり、
R1−8は独立してH、Cl、Br、I、F、C1−24アルコキシ、C1−24アルキル、またはアリールであり、R1−8のうちの少なくとも1つは−W−X−Y基{式中、WはC1−12アルキレンまたはC1−12オキシアルキレンであり、Xはカーボネート、ウレタン、ウレア、テトラメチルジシロキサンまたはそれらの組み合わせであり、Yは−R9−C(R10)=CH2(式中、R9は線状または分枝状C2−10アルキレンまたはC2−10オキシアルキレン、またはアリーレンまたはそれらの誘導体であり、R10はHまたはCH3である)である}を含有しなければならない]。 - ポリエチレンコポリマー添加剤をさらに含有する請求項1または2に記載の紫外線硬化性感圧接着剤。
- 前記接着剤が全接着剤の2重量%未満の溶剤含有量を示す請求項1または2に記載の紫外線硬化性感圧接着剤。
- 請求項13に記載の接着剤を含む製品。
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| US31197010P | 2010-03-09 | 2010-03-09 | |
| US61/311,970 | 2010-03-09 | ||
| PCT/US2011/027632 WO2011112643A2 (en) | 2010-03-09 | 2011-03-09 | Cationic uv-crosslinkable acrylic polymers for pressure sensitive adhesives |
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| US20120329900A1 (en) | 2012-12-27 |
| CN104893626B (zh) | 2017-08-08 |
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| KR20130053397A (ko) | 2013-05-23 |
| EP2985330A1 (en) | 2016-02-17 |
| BR112012022560B1 (pt) | 2020-01-28 |
| WO2011112643A3 (en) | 2012-03-01 |
| US20140303274A1 (en) | 2014-10-09 |
| EP2985330B1 (en) | 2017-05-03 |
| US9469794B2 (en) | 2016-10-18 |
| KR101650693B1 (ko) | 2016-08-25 |
| EP2545132B1 (en) | 2015-11-04 |
| EP2545132A4 (en) | 2013-11-06 |
| BR112012022560A2 (pt) | 2016-08-30 |
| US8796350B2 (en) | 2014-08-05 |
| CN102782072B (zh) | 2015-06-03 |
| JP2013522394A (ja) | 2013-06-13 |
| CN104893626A (zh) | 2015-09-09 |
| CN102782072A (zh) | 2012-11-14 |
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