JP5638439B2 - 粘着剤および粘着シート - Google Patents
粘着剤および粘着シート Download PDFInfo
- Publication number
- JP5638439B2 JP5638439B2 JP2011079020A JP2011079020A JP5638439B2 JP 5638439 B2 JP5638439 B2 JP 5638439B2 JP 2011079020 A JP2011079020 A JP 2011079020A JP 2011079020 A JP2011079020 A JP 2011079020A JP 5638439 B2 JP5638439 B2 JP 5638439B2
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- JP
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- Prior art keywords
- meth
- pressure
- sensitive adhesive
- acrylic acid
- acid ester
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000000853 adhesive Substances 0.000 title claims description 68
- 230000001070 adhesive effect Effects 0.000 title claims description 68
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 135
- 229920000642 polymer Polymers 0.000 claims description 122
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 88
- 125000000524 functional group Chemical group 0.000 claims description 76
- 239000000178 monomer Substances 0.000 claims description 69
- 239000003431 cross linking reagent Substances 0.000 claims description 62
- 239000010410 layer Substances 0.000 claims description 49
- 230000003287 optical effect Effects 0.000 claims description 26
- 239000012790 adhesive layer Substances 0.000 claims description 24
- 238000004132 cross linking Methods 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 13
- 238000009864 tensile test Methods 0.000 claims description 9
- 239000000470 constituent Substances 0.000 claims description 7
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- -1 2-ethylhexyl Chemical group 0.000 description 32
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 22
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- 239000006087 Silane Coupling Agent Substances 0.000 description 19
- 239000000243 solution Substances 0.000 description 16
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- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 7
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- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 6
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- NOWKCMXCCJGMRR-UHFFFAOYSA-N Aziridine Chemical compound C1CN1 NOWKCMXCCJGMRR-UHFFFAOYSA-N 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
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- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 3
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 3
- RTTZISZSHSCFRH-UHFFFAOYSA-N 1,3-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC(CN=C=O)=C1 RTTZISZSHSCFRH-UHFFFAOYSA-N 0.000 description 2
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 description 2
- ZNQVEEAIQZEUHB-UHFFFAOYSA-N 2-ethoxyethanol Chemical compound CCOCCO ZNQVEEAIQZEUHB-UHFFFAOYSA-N 0.000 description 2
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical group OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 2
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- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 239000004985 Discotic Liquid Crystal Substance Substances 0.000 description 2
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- 125000001931 aliphatic group Chemical group 0.000 description 2
- 125000003118 aryl group Chemical group 0.000 description 2
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- SJPFBRJHYRBAGV-UHFFFAOYSA-N n-[[3-[[bis(oxiran-2-ylmethyl)amino]methyl]phenyl]methyl]-1-(oxiran-2-yl)-n-(oxiran-2-ylmethyl)methanamine Chemical compound C1OC1CN(CC=1C=C(CN(CC2OC2)CC2OC2)C=CC=1)CC1CO1 SJPFBRJHYRBAGV-UHFFFAOYSA-N 0.000 description 2
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- NMOALOSNPWTWRH-UHFFFAOYSA-N tert-butyl 7,7-dimethyloctaneperoxoate Chemical compound CC(C)(C)CCCCCC(=O)OOC(C)(C)C NMOALOSNPWTWRH-UHFFFAOYSA-N 0.000 description 1
- GJBRNHKUVLOCEB-UHFFFAOYSA-N tert-butyl benzenecarboperoxoate Chemical compound CC(C)(C)OOC(=O)C1=CC=CC=C1 GJBRNHKUVLOCEB-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/308—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive tape or sheet losing adhesive strength when being stretched, e.g. stretch adhesive
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- Chemical & Material Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Adhesives Or Adhesive Processes (AREA)
- Adhesive Tapes (AREA)
- Polarising Elements (AREA)
Description
〔粘着剤〕
本実施形態に係る粘着剤は、重量平均分子量(Mw)が50万〜300万の第1の(メタ)アクリル酸エステル重合体(A)と、重量平均分子量が8000〜30万の第2の(メタ)アクリル酸エステル重合体(B)を架橋してなる成分とを含有する。なお、本明細書において、(メタ)アクリル酸エステルとは、アクリル酸エステル及びメタクリル酸エステルの両方を意味する。他の類似用語も同様である。また、「重合体」には「共重合体」の概念も含まれるものとする。
(1)架橋剤(C)と反応する官能基(b1)を有するモノマーを構成成分とし、当該重合体(B)が含有する、架橋剤(C)と反応する官能基は、実質的に官能基(b1)のみであるか、
(2)架橋剤(C)との反応性が下記式(I)を満たす官能基(b1)を有するモノマーと、架橋剤(C)との反応性が下記式(I)を満たす官能基(b2)を有するモノマーとを構成成分とすることが好ましい。
架橋剤(C)との反応性:官能基(b2)<官能基(b1)・・・(I)
すなわち、(2)の重合体(B)において、官能基(b1)の架橋剤(C)との反応性は、官能基(b2)の架橋剤(C)との反応性よりも高いことが好ましい。
応力緩和率(%)={(900%伸長直後の応力−300秒保持後の応力)/900%伸長直後の応力}×100
図1に示すように、第1の実施形態に係る粘着シート1Aは、下から順に、剥離シート12と、剥離シート12の剥離面に積層された粘着剤層11と、粘着剤層11に積層された基材13とから構成される。
なお、加熱処理および養生の条件については、前述した通りである。
1.重合体(A)の調製
攪拌機、温度計、還流冷却器、滴下装置および窒素導入管を備えた反応容器に、アクリル酸n−ブチル97.0質量部、アクリル酸3.0質量部、酢酸エチル200質量部、および2,2'−アゾビスイソブチロニトリル0.08質量部を仕込み、上記反応容器内の空気を窒素ガスで置換した。この窒素雰囲気下中で攪拌しながら、反応溶液を60℃に昇温し、16時間反応させた後、室温まで冷却した。ここで、得られた溶液の一部を後述する方法でGPC測定し、重量平均分子量150万の重合体(A)の生成を確認した。
攪拌機、温度計、還流冷却器、滴下装置および窒素導入管を備えた反応容器に、アクリル酸n−ブチル85.0質量部、アクリル酸2−ヒドロキシエチル15.0質量部、酢酸エチル200質量部、2,2'−アゾビスイソブチロニトリル0.16質量部、および2−メルカプトエタノール0.3質量部を仕込み、上記反応容器内の空気を窒素ガスで置換した。この窒素雰囲気下中で攪拌しながら、反応溶液を70℃に昇温し、6時間反応させた後、室温まで冷却した。ここで、得られた溶液の一部を後述する方法でGPC測定し、重量平均分子量6万の重合体(B)の生成を確認した。
上記工程(1)で得られた重合体(A)100質量部(固形分換算値)と、上記工程(2)で得られた重合体(B)15質量部(固形分換算値)とを混合した後、架橋剤(C)として、重合体(B)の水酸基0.6当量に相当する量のトリメチロールプロパンのトリレンジイソシアネート(TDI系)付加物(日本ポリウレタン社製,商品名「コロネートL」)2.21質量部を添加した。最後に、シランカップリング剤(D)として、3−グリシドキシプロピルトリメトキシシラン(信越化学社製,商品名「KBM403」)0.2質量部を添加し、十分に撹拌することにより、粘着性組成物の希釈溶液を得た。
[重合体(A)及び(B)]
BA:アクリル酸n−ブチル
AA:アクリル酸
HEA:アクリル酸2−ヒドロキシエチル
4HBA:アクリル酸4−ヒドロキシブチル
[可塑剤]
・アデカサイザーC−8:トリメリット酸エステル系可塑剤(トリス(2−エチルヘキシル)トリメリテート)(旭電化工業社製,商品名「アデカサイザーC−8」)
[架橋剤(C)]
・イソシアネート系架橋剤
コロネートL:トリメチロールプロパンのトリレンジイソシアネート付加物(日本ポリウレタン社製,商品名「コロネートL」)
タケネートD−110N:トリメチロールプロパンのキシレンジイソシアネート付加物(三井化学ポリウレタン社製,商品名「タケネートD−110N」)
・エポキシ系架橋剤
TETRAD−X:N,N,N',N'−テトラグリシジル−m−キシリレンジアミン(三菱瓦斯化学社製,商品名「TETRAD−X」)
[シランカップリング剤(D)]
KBM403:3−グリシドキシプロピルトリメトキシシラン(信越化学社製,商品名「KBM403」)
KBE9007:3−イソシアネートプロピルトリエトキシシラン(信越化学社製,商品名「KBE9007」)
粘着性組成物を構成する各モノマーの種類および割合、可塑剤、架橋剤およびシランカップリング剤の種類および添加量、ならびに重合体(A)および重合体(B)の配合比を表1に示すように変更する以外、実施例1と同様にして粘着剤層付き偏光板を製造した。
<測定条件>
・GPC測定装置:東ソー社製,HLC−8020
・GPCカラム(以下の順に通過):東ソー社製
TSK guard column HXL−H
TSK gel GMHXL(×2)
TSK gel G2000HXL
・測定溶媒:テトラヒドロフラン
・測定温度:40℃
実施例または比較例にて粘着剤層付き偏光板の作製に使用した偏光板に替えて、ポリエチレンテレフタレートフィルムの片面をシリコーン系剥離剤で剥離処理した剥離シート(リンテック社製,SP−PET3801,厚さ:38μm)を使用し、粘着シートを作製した。具体的には、実施例または比較例の製造過程で得られた剥離シート/粘着剤層(厚さ:25μm)からなる構成体の露出している粘着剤層上に、上記剥離シートを剥離処理面側が接するように積層した。これにより、剥離シート/粘着剤層/剥離シートの構成からなる粘着シートを作製した。
測定サンプルとして、ゲル分率の測定に用いた粘着シートと同様の粘着シート(7日間養生済み)を用意した。当該粘着シートの粘着剤層について、ヘイズメーター(日本電色工業社製,NDH2000)を用いて、JIS K7105に準じてヘイズ値(%)(Hz(%)と略する場合がある)を測定した。結果を表2に示す。なお、好ましいヘイズ値の範囲は、0〜5%である。
実施例または比較例で得られた粘着剤層付き偏光板を、裁断装置(荻野製作所社製スーパーカッター,PN1−600)を用いて233mm×309mmサイズに調整した。剥離シートを剥がして、露出した粘着剤層を介して無アルカリガラス(コーニング社製,イーグルXG)に貼付したのち、栗原製作所製オートクレーブにて0.5MPa、50℃で、20分加圧した。
◎:4辺において、欠点が無いもの
○:4辺において、外周端部から0.6mm以上の部位に欠点が無いもの
×:4辺の少なくとも1辺において、外周端部から0.6mm以上の部位に、浮き、剥がれ、発泡、スジなどの0.1mm以上の粘着剤の外観異常欠点があるもの
実施例または比較例で得られた粘着剤層付き偏光板を、裁断装置(荻野製作所社製スーパーカッター,PN1−600)を用いて233mm×309mmサイズに調整した。剥離シートを剥がして、露出した粘着剤層を介して無アルカリガラス(コーニング社製,イーグルXG)に貼付したのち、栗原製作所製オートクレーブにて0.5MPa、50℃で、20分加圧した。なお、上記貼合は、無アルカリガラスの表裏に、粘着剤層付き偏光板を偏光軸がクロスニコル状態(偏光軸:∠45°,∠135°)になるように行った。この状態で、80℃dry環境下にて250時間放置した後、23℃、50%RHの環境下で2時間放置し、これをサンプルとして、以下に示す方法で光漏れ性を評価した。結果を表2に示す。
大塚電子社製のMCPD−2000を用い、上記サンプルにおける図3に示す各領域の明度L*を測定し、明度差ΔL*を、式
ΔL*=[(b+c+d+e)/4]−a
(ただし、a、b、c、d及びeは、それぞれA領域、B領域、C領域、D領域及びE領域のあらかじめ定められた測定点(各領域の中央部1箇所)における明度である。)で求め、光漏れ性とした。ΔL*の値が小さいほど光漏れが少ないことを示す。なお、L*maxは、上記全ての領域における最大の明度を示す。
上記サンプルをフラットイルミネーター(電通産業社製,HF−SL−A312LC,照度:26,000Lux,輝度:10,000cd)の上に設置し、二次元色彩輝度計(コニカミノルタ社製,CA−2000)にて撮影し、解析ソフトウェア(コニカミノルタ社製,CA−S20w)によって輝度分布画像に変換した。得られたサンプルの輝度分布画像を、図4に示す評価基準に基づいて評価した。
実施例及び比較例で調製した粘着性組成物を、ポリエチレンテレフタレートフィルムの片面をシリコーン系剥離剤で剥離処理した剥離シート(リンテック社製,SP−PET3811)の剥離処理面に乾燥後の塗布厚が25μmとなるように塗布し、100℃で1分間加熱し、粘着剤層を形成した。その粘着剤層と、ポリエチレンテレフタレートフィルムの片面をシリコーン系剥離剤で剥離処理した別の剥離シート(リンテック社製,SP−PET3801)の剥離処理面とを貼り合わせて、粘着シートを得た。
11…粘着剤層
12,12a,12b…剥離シート
13…基材
Claims (6)
- 重量平均分子量が50万〜300万の第1の(メタ)アクリル酸エステル重合体(A)と、
重量平均分子量が8000〜30万の第2の(メタ)アクリル酸エステル重合体(B)を架橋してなる成分と
を含有し、
架橋前の前記第2の(メタ)アクリル酸エステル重合体(B)が、構成成分として、反応性の官能基含有モノマーを10質量%以上、50質量%未満含有し、
引張試験にて900%伸長させて300秒保持した後の応力緩和率が60%以上であり、
ゲル分率が30〜90%である
ことを特徴とする粘着剤。 - 前記第1の(メタ)アクリル酸エステル重合体(A)100質量部に対する前記第2の(メタ)アクリル酸エステル重合体(B)の割合は、5〜50質量部であることを特徴とする請求項1記載の粘着剤。
- 前記第2の(メタ)アクリル酸エステル重合体(B)は、前記反応性の官能基と反応可能な架橋性基を有する架橋剤(C)との反応によって架橋されたことを特徴とする請求項1または2に記載の粘着剤。
- 基材と、粘着剤層とを備えた粘着シートであって、
前記粘着剤層は、請求項1〜3のいずれか一項に記載の粘着剤からなる
ことを特徴とする粘着シート。 - 前記基材は、光学部材であることを特徴とする請求項4に記載の粘着シート。
- 2枚の剥離シートと、
前記2枚の剥離シートの剥離面と接するように前記剥離シートに挟持された粘着剤層と
を備えた粘着シートであって、
前記粘着剤層は、請求項1〜3のいずれか一項に記載の粘着剤からなる
ことを特徴とする粘着シート。
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