JP2015098513A - 偏光板用接着剤組成物 - Google Patents
偏光板用接着剤組成物 Download PDFInfo
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- JP2015098513A JP2015098513A JP2013238117A JP2013238117A JP2015098513A JP 2015098513 A JP2015098513 A JP 2015098513A JP 2013238117 A JP2013238117 A JP 2013238117A JP 2013238117 A JP2013238117 A JP 2013238117A JP 2015098513 A JP2015098513 A JP 2015098513A
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- 229920001155 polypropylene Polymers 0.000 description 1
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- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 150000003220 pyrenes Chemical class 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 229940079827 sodium hydrogen sulfite Drugs 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
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- CIHOLLKRGTVIJN-UHFFFAOYSA-N tert‐butyl hydroperoxide Chemical compound CC(C)(C)OO CIHOLLKRGTVIJN-UHFFFAOYSA-N 0.000 description 1
- XBFJAVXCNXDMBH-UHFFFAOYSA-N tetracyclo[6.2.1.1(3,6).0(2,7)]dodec-4-ene Chemical compound C1C(C23)C=CC1C3C1CC2CC1 XBFJAVXCNXDMBH-UHFFFAOYSA-N 0.000 description 1
- 239000003017 thermal stabilizer Substances 0.000 description 1
- 125000002889 tridecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- VOITXYVAKOUIBA-UHFFFAOYSA-N triethylaluminium Chemical compound CC[Al](CC)CC VOITXYVAKOUIBA-UHFFFAOYSA-N 0.000 description 1
- LALRXNPLTWZJIJ-UHFFFAOYSA-N triethylborane Chemical compound CCB(CC)CC LALRXNPLTWZJIJ-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- MKOBNHWWZPEDQJ-UHFFFAOYSA-N trifluoro(methanidylsulfonyl)methane Chemical compound [CH2-]S(=O)(=O)C(F)(F)F MKOBNHWWZPEDQJ-UHFFFAOYSA-N 0.000 description 1
- DQZNLOXENNXVAD-UHFFFAOYSA-N trimethoxy-[2-(7-oxabicyclo[4.1.0]heptan-4-yl)ethyl]silane Chemical compound C1C(CC[Si](OC)(OC)OC)CCC2OC21 DQZNLOXENNXVAD-UHFFFAOYSA-N 0.000 description 1
- WLOQLWBIJZDHET-UHFFFAOYSA-N triphenylsulfonium Chemical compound C1=CC=CC=C1[S+](C=1C=CC=CC=1)C1=CC=CC=C1 WLOQLWBIJZDHET-UHFFFAOYSA-N 0.000 description 1
- 239000012953 triphenylsulfonium Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
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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
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
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- C08F2/00—Processes of polymerisation
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- C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
- C08F2/50—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light with sensitising agents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
- C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
- C08F220/1807—C7-(meth)acrylate, e.g. heptyl (meth)acrylate or benzyl (meth)acrylate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F222/00—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 a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/10—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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
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Abstract
Description
本発明の第一の形態は、エポキシ基含有化合物(A)50〜90質量部と、(メタ)アクリレートモノマー(B)10〜50質量部(この際、(A)成分および(B)成分の総量は100質量部である)と、光酸発生剤(C)1〜7質量部と、光増感剤および/または光重合開始剤(D)0.1〜7質量部とを含有する偏光板用接着剤組成物に関する。そして、エポキシ基含有化合物(A)は、その総量100質量部に対し、脂環式エポキシ基含有化合物(A1)50〜95質量部と、芳香族基含有エポキシ基含有化合物(A2)1〜50質量部とを含む点に特徴を有する。なお、本明細書において、「偏光板用接着剤組成物」を、単に「接着剤組成物」とも称する。
本形態の接着剤組成物は、エポキシ基含有化合物(A)を含有する。エポキシ基含有化合物(A)は、脂環式エポキシ基含有化合物(A1)および芳香族基含有エポキシ基含有化合物(A2)を必須に含み、任意に脂環基含有エポキシ基含有化合物(A3)を含みうる。
脂環式エポキシ基含有化合物(A1)は、分子内に脂環式エポキシ基を有する化合物を意味する。脂環式エポキシ基とは、下記一般式(1)で示すように、脂環(シクロアルキル)基の隣り合う2つの炭素原子がエポキシ基を構成している構造を有する官能基を意味する。
芳香族基含有エポキシ基含有化合物(A2)は、分子内に芳香族基およびエポキシ基を有する化合物であって、上記脂環式エポキシ基含有化合物(A1)以外の化合物(すなわち、脂環式エポキシ基を有しない化合物)を意味する。芳香族基含有エポキシ基含有化合物(A2)は、1分子内にエポキシ基を少なくとも1つ有していればよいが、1分子内に2以上のエポキシ基を有していることが好ましい。これにより、架橋構造が形成され、硬化後の接着剤層の弾性率が高くなる。その結果、熱による体積変化が小さくなり、内部応力の発生、言い換えると強度の低下が抑制され、熱衝撃試験による偏光子の割れがより一層低減されうる。
脂環基含有エポキシ基含有化合物(A3)は、分子内に脂環(シクロアルキル)基およびエポキシ基を有する化合物であって、上記脂環式エポキシ基含有化合物(A1)および芳香族基含有エポキシ基含有化合物(A2)以外の化合物(すなわち、脂環式エポキシ基および芳香族基を有しない化合物)を意味する。脂環基含有エポキシ基含有化合物(A3)は、1分子内にエポキシ基を少なくとも1つ有していればよいが、1分子内に2以上のエポキシ基を有していることが好ましい。これにより、架橋構造が形成され、硬化後の接着剤層の弾性率が高くなる。その結果、熱による体積変化が小さくなり、内部応力の発生、言い換えると強度の低下が抑制され熱衝撃試験による偏光子の割れがより一層低減されうる。
本形態の接着剤組成物は(メタ)アクリレートモノマー(B)を含有する。なお、「(メタ)アクリレート」とは、アクリレートおよびメタアクリレートの総称である。(メタ)アクリレートモノマー(B)は、分子内に(メタ)アクリロイル基を有する化合物であり、分子内に1つの(メタ)アクリロイル基を有する単官能(メタ)アクリレートモノマー(B1)、分子内に2以上の(メタ)アクリロイル基を有する多官能(メタ)アクリレートモノマー(B2)のいずれであってもよく、これらを併用してもよい。
本形態の接着剤組成物は、エポキシ基含有化合物(A)および(メタ)アクリレートモノマー(B)の総量100質量部に対し、エポキシ基含有化合物(A)を50〜90質量部、(メタ)アクリレートモノマー(B)を10〜50質量部の割合で含有することを必須とする。なお、この際、エポキシ基含有化合物(A)は、その総量100質量部に対し、脂環式エポキシ基含有化合物(A1)を50〜95質量部、芳香族基含有エポキシ基含有化合物(A2)を1〜50質量部の割合で含む。
光酸発生剤は光を照射すると強酸を発生させるものであり、強酸がエポキシ基含有化合物を攻撃し、エポキシ基含有化合物の重合が開始される。光酸発生剤としては、従来公知の光酸発生剤を特に制限なく使用できる。具体的には、例えば、芳香族ジアゾニウム塩、芳香族ヨードニウム塩や芳香族スルホニウム塩などのオニウム塩、鉄−アレン錯体などが挙げられる。これらは、単独でもまたは2種以上を組み合わせて使用してもよい。
本形態の接着剤組成物は、さらに、光重合開始剤および光増感剤の少なくとも一方を含む。光重合開始剤として特に制限はなく、従来公知の光重合開始剤を好ましく使用できる。光重合開始剤は、単独でもまたは2種以上を組み合わせて使用してもよい。
本形態の接着剤組成物には、必要に応じて、上記の(A)〜(D)成分以外にも、接着剤組成物の効果を著しく減じない限度において、他の成分を含んでもよい。
上記他の成分は、本形態の接着剤組成物の総量100質量部に対し、50質量部以下であることが好ましく、30質量部以下であることがより好ましく、20質量部以下であることがさらに好ましく、10質量部以下であることが特に好ましく、5質量部以下であることが最も好ましい。他の成分の含有量を上記範囲とすることによって、本形態の接着剤組成物の効果を十分に発揮させることができる。
本形態の接着剤組成物の製造方法は、特に制限はなく、通常は、上記の成分を混合して接着剤組成物が得られる。粘度調整のために適宜有機溶媒を使用してもよい。混合方法にも特に制限はなく、UV光を遮光した部屋で、室温(25℃)で、液体内が均一になるまで十分に攪拌混合すればよい。
本発明の第二の形態によれば、偏光子と保護フィルムとを含み、当該偏光子および保護フィルムが、上記第一の形態の偏光板用接着剤組成物を用いて接着された偏光板が提供される。本形態の偏光板は、製造時の工程性に優れ、十分な接着性および信頼性を有する。以下、本形態の偏光板の構成について説明する。
本形態の偏光子は、特に制限はなく、従来公知のものを使用できる。例えば、ポリビニルアルコール系フィルム、部分ホルマール化ポリビニルアルコール系フィルム、エチレン・酢酸ビニル共重合体系部分ケン化フィルム等の親水性高分子フィルムに、ヨウ素や二色性染料等の二色性材料を吸着させて一軸延伸したもの、ポリビニルアルコールの脱水処理物やポリ塩化ビニルの脱塩酸処理物等ポリエン系配向フィルム等が挙げられる。
保護フィルムとしては、透明性、機械的強度、熱安定性、水分遮断性、等方性などに優れる材料が好ましい。例えば、セルロースジアセテート、セルローストリアセテート等のセルロース系樹脂、ポリエチレンテレフタレート、ポリエチレンナフタレート等のポリエステル系樹脂、ポリメチルメタクリレート等のアクリル系樹脂、ポリスチレンやアクリロニトリル・スチレン共重合体(AS樹脂)等のスチレン系樹脂、ポリカーボネート系樹脂、ポリエチレン、ポリプロピレン、シクロ系ないしはノルボルネン構造を有するポリオレフィン、エチレン・プロピレン共重合体等のポリオレフィン系樹脂、塩化ビニル系樹脂、ナイロンや芳香族ポリアミド等のアミド系樹脂、イミド系樹脂、スルホン系樹脂、ポリエーテルスルホン系樹脂、ポリエーテルエーテルケトン系樹脂、ポリフェニレンスルフィド系樹脂、ビニルアルコール系樹脂、塩化ビニリデン系樹脂、ビニルブチラール系樹脂、アリレート系樹脂、ポリオキシメチレン系樹脂、エポキシ系樹脂、または前記樹脂のブレンドなどが挙げられる。
偏光板の製造方法は、特に制限はなく、従来公知の方法によって保護フィルムと偏光子とを、上述の接着剤組成物を用いて貼り合わせることによって製造し得る。塗布した接着剤組成物は、紫外線照射により接着性を発現して接着層を構成する。
本発明の第三の形態によれば、上述の偏光板を有する、画像表示装置が提供される。画像表示装置としては、特に制限はないが、液晶表示装置に適用することが好ましい。本形態の画像表示装置は、特に、過酷な温度条件においても優れた耐久性を発揮することができる。
<接着剤組成物の調製>
表1に示される成分を、表1に示される配合量に従って、23℃、相対湿度50%の恒温室内で、目視で均一になるまで攪拌混合し、実施例1〜15および比較例1〜4の接着剤組成物を得た。なお、表1中の単位は「g」である。
偏光子は、以下の方法で作製した。平均重合度2400、ケン化度99.9%の厚み75μmのポリビニルアルコールフィルムを、28℃の温水中に90秒間浸漬し膨潤させ、次いで、ヨウ素/ヨウ化カリウム(重量比2/3)の濃度0.6重量%の水溶液に浸漬し、2.1倍に延伸させながらポリビニルアルコールフィルムを染色した。その後、60℃のホウ酸エステル水溶液中で合計の延伸倍率が5.8倍となるように延伸を行い、水洗、45℃で3分乾燥を行い、偏光子(厚み25μm)を作製した。
上記で作製した紫外線照射直後の偏光板を、図2に示すように、折り曲げた偏光板8の間隔が10mmとなるように(R10mm)折り曲げ、保護フィルムの剥離があるかないかを目視で判定した。剥離が観察されなかった場合は○、観察された場合は×とした。評価結果を下記表1に示す。
上記で作製した偏光板を、剥離強度測定用試料として150mm×25mmに裁断し、PETフィルム側を両面テープでステンレス鋼(SUS)板に固定した。偏光板の偏光子とPETフィルムとの界面(接着剤層)で剥離できるよう端面にナイフを入れ、はがし代を作った。このはがし代部を引張試験機を用いて剥離角90°、剥離速度300mm/分で剥離し、偏光子とPETフィルムとの剥離強度(剥離強度PET)を測定した。評価結果を下記表1に示す。好ましい結果は3(N/25mm)以上であり、より好ましくは5(N/25mm)以上である。
上記で作製した偏光板を、トムソン刃で5cm×5cmの大きさに裁断し、裁断の際の端部の剥がれの状態を目視で観察した。評価基準としては、0.5mm以下を合格とした。評価結果を表1に示す。好ましい結果は、0.3mm以下であり、より好ましくは0.1mm以下である。
上記で作製した偏光板を、トムソン刃で5cm×5cmの大きさに裁断し、温水浸漬試験用試料とした。当該試料を60℃の温水に浸漬し、2時間保持した。その後、温水から試料を取り出し、偏光子の収縮の大きさを測定した。図3(A)に示すように、試験前の偏光板8の端部から、図3(B)に示すように、延伸方向に収縮した偏光板8の端部までを測定し、収縮の大きさ9とした。接着剤の接着性が高ければより収縮は小さく、接着性が十分でなければ偏光板の収縮はより大きい値となる。評価基準としては、収縮の大きさが2.0mm以下を合格とした。評価結果を表1に示す。好ましい結果は、0.5mm以下であり、より好ましくは0.5mm以下であり、特に好ましくは0.1mm以下である。
上記で作製した偏光板を、トムソン刃で5cm×5cmの大きさに裁断し、熱衝撃試験用試料とした。次いで図4(A)に示すように、ガラス板10に、ノンサポートテープ11(CS−9621T、日東電工株式会社製)を用いて上記試料を貼り合わせ、室温(23℃)で24時間保管した試験片で熱衝撃試験を行った。
2 接着剤組成物溶液、
3 保護フィルム(COPフィルム)、
4 保護フィルム(PETフィルム)、
5 紫外線照射前偏光板、
6、7 ロール、
8 偏光板、
9 収縮の大きさ、
10 ガラス板、
11 ノンサポートテープ、
12 偏光子割れ。
Claims (7)
- エポキシ基含有化合物(A)50〜90質量部と、
(メタ)アクリレートモノマー(B)10〜50質量部(この際、(A)成分および(B)成分の総量は100質量部である)と、
光酸発生剤(C)1〜7質量部と、
光増感剤および/または光重合開始剤(D)0.1〜7質量部と、
を含有する偏光板用接着剤組成物において、
前記エポキシ基含有化合物(A)は、その総量100質量部に対し、
脂環式エポキシ基含有化合物(A1)50〜95質量部と、
芳香族基含有エポキシ基含有化合物(A2)1〜50質量部と、
を含む、偏光板用接着剤組成物。 - 前記エポキシ基含有化合物(A)は、その総量100質量部に対し、脂環基含有エポキシ基含有化合物(A3)(但し、芳香族基を含まない)を0質量部を超えて40質量部以下含む、請求項1に記載の偏光板用接着剤組成物。
- 前記(メタ)アクリレートモノマー(B)は、その総量100質量部に対し、多官能(メタ)アクリレートモノマー(B2)を0質量部を超えて100質量部以下含む、請求項1に記載の偏光板用接着剤組成物。
- 前記エポキシ基含有化合物(A)は、その総量100質量部に対し、
前記脂環式エポキシ基含有化合物(A1)50〜80質量部と、
前記芳香族基含有エポキシ基含有化合物(A2)1〜40質量部と、
前記脂環基含有エポキシ基含有化合物(A3)(但し、芳香族基を含まない)1〜40質量部と、
を含む、請求項2に記載の偏光板用接着剤組成物。 - 前記エポキシ基含有化合物(A)50〜90質量部と、
前記多官能(メタ)アクリレートモノマー(B2)10〜50質量部(この際、(A)成分および(B2)成分の総量は100質量部である)と、
前記光酸発生剤(C)1〜7質量部と、
前記光増感剤および/または光重合開始剤(D)0.1〜7質量部と、
を含有し、
前記エポキシ基含有化合物(A)は、その総量100質量部に対し、
前記脂環式エポキシ基含有化合物(A1)60〜95質量部と、
前記芳香族基含有エポキシ基含有化合物(A2)5〜40質量部と、
を含む、請求項3に記載の偏光板用接着剤組成物。 - 偏光子と保護フィルムとを含み、前記偏光子および前記保護フィルムが、請求項1〜5のいずれか1項に記載の偏光板用接着剤組成物を用いて接着された、偏光板。
- 請求項6に記載の偏光板を有する、画像表示装置。
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