JP5733865B2 - 偏光板用接着剤及びこれを含む偏光板 - Google Patents
偏光板用接着剤及びこれを含む偏光板 Download PDFInfo
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- JP5733865B2 JP5733865B2 JP2013529083A JP2013529083A JP5733865B2 JP 5733865 B2 JP5733865 B2 JP 5733865B2 JP 2013529083 A JP2013529083 A JP 2013529083A JP 2013529083 A JP2013529083 A JP 2013529083A JP 5733865 B2 JP5733865 B2 JP 5733865B2
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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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- G—PHYSICS
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- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/08—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of polarising materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/68—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the catalysts used
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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Description
製造例1:偏光子保護フィルムの製造
ポリ(N−シクロヘキシルマレイミド−co−メチルメタクリレート)、スチレン−無水マレイン酸共重合体樹脂及びフェノキシ系樹脂を100:2.5:5の重量比で均一に混合した樹脂組成物を、原料ホッパー(hopper)から圧出器までを窒素置換した24φの圧出器に供給し、250℃で溶融して原料ペレット(pellet)を製造した。
TAC系高分子フィルムとして、V TAC(富士社)、N TAC(コニカ社)及びUZ TAC(富士社)を商業的に入手し使用した。
(1)接着剤の製造
モノマーとして、2−HEA(2−Hydroxyethyl acrylate)38.5重量%、PEA(Phenoxyethyl acrylate)10重量%、IBOA(Isobornyl acrylate)15重量%、ラジカル開始剤としてCGI 819 3重量%、カチオン性光重合開始剤としてヨウ素開始剤(Irgacure 250、Ciba社)3重量%、光増感剤(イソプロピルチオキサントン、アルドリッチ)0.5重量%、エポキシ樹脂としてセロキサイド(Celloxide)2021P 15重量%、1,4−シクロヘキサンジメタノールジグリシジルエーテル(CHDMGDE)(HAJIN CHEM TECH CO. LTD)15重量%を混合して偏光板用接着剤組成物を製造した。
上記実施例1の(1)で製造された接着剤をPVA素子の両面にスポイトで塗布した後、V TAC(またはN TACまたは製造例1の(1)アクリルフィルム)(基材1)とTAC(UZ TAC)(基材2)を夫々積層してラミネーター(5m/min)に通過させる。最終接着層の厚さが1〜2μmとなるように条件を設定した後、貼り合せられた偏光板をUV照射装置(Metal halide lamp)のベルト上に配置し、2000mJ/cm2の紫外線を照射する。
エポキシ樹脂としてセロキサイド(Celloxide)2021P 20重量%、1,4−シクロヘキサンジメタノールジグリシジルエーテル(CHDMGDE)(HAJIN CHEM TECH CO. LTD)10重量%を含む接着剤を利用したことを除き、上記実施例1と同様の方法で偏光板を製造した。
モノマーとして2−HEA(2−Hydroxyethyl acrylate)28.5重量%、エポキシ樹脂としてセロキサイド(Celloxide)2021P 20重量%、及び1,4−シクロヘキサンジメタノールジグリシジルエーテル(CHDMGDE)(HAJIN CHEM TECH CO. LTD)20重量%を含む接着剤を利用したことを除き、上記実施例1と同様の方法で偏光板を製造した。
モノマーとして2−HEA(2−Hydroxyethyl acrylate)29重量%、エポキシ樹脂としてセロキサイド(Celloxide)2021P 20重量%、及び1,4−シクロヘキサンジメタノールジグリシジルエーテル(CHDMGDE)(HAJIN CHEM TECH CO. LTD)20重量%を含み、ヨウ素開始剤及び光増感剤を含まずにスルホニウム塩開始剤(製品名、製造社)を3重量%含む接着剤を利用したことを除き、上記実施例1と同様の方法で偏光板を製造した。
モノマーとして2−HEA(2−Hydroxyethyl acrylate)28.5重量%、エポキシ樹脂としてセロキサイド(Celloxide)2021P 10重量%、1,4−シクロヘキサンジメタノールジグリシジルエーテル(CHDMGDE)(HAJIN CHEM TECH CO. LTD)15重量%及びビスフェノールFタイプ(シグマアルドリッチ社)エポキシ15重量%を含む接着剤を利用したことを除き、上記実施例1と同様の方法で偏光板を製造した。
エポキシ樹脂としてセロキサイド(Celloxide)2021P及び1,4−シクロヘキサンジメタノールジグリシジルエーテル(CHDMGDE)(HAJIN CHEM TECH CO. LTD)を含まずに2−HEA(2−Hydroxyethyl acrylate)を68.5重量%を含む接着剤を利用したことを除き、上記実施例1と同様の方法で偏光板を製造した。
エポキシ樹脂としてセロキサイド(Celloxide)2021P 30重量%を含み、1,4−シクロヘキサンジメタノールジグリシジルエーテル(CHDMGDE)(HAJIN CHEM TECH CO. LTD)を含まない接着剤を利用したことを除き、上記実施例1と同様の方法で偏光板を製造した。
エポキシ樹脂としてセロキサイド(Celloxide)2021Pを含まずに、1,4−シクロヘキサンジメタノールジグリシジルエーテル(CHDMGDE)(HAJIN CHEM TECH CO. LTD)30重量%を含む接着剤を利用したことを除き、上記実施例1と同様の方法で偏光板を製造した。
エポキシ樹脂としてセロキサイド(Celloxide)2021Pを40重量%、1,4−シクロヘキサンジメタノールジグリシジルエーテル(CHDMGDE)(HAJIN CHEM TECH CO. LTD)5重量%を含む接着剤を利用したことを除き、上記実施例1と同様の方法で偏光板を製造した。
エポキシ樹脂としてセロキサイド(Celloxide)2021P 5重量%、1,4−シクロヘキサンジメタノールジグリシジルエーテル(CHDMGDE)(HAJIN CHEM TECH CO. LTD)40重量%を含む接着剤を利用したことを除き、上記実施例1と同様の方法で偏光板を製造した。
上記実施例及び比較例で製作した偏光板に対し、偏光子と偏光板保護フィルムの剥離力を測定した。剥離実験は、幅20mm、長さ100mmの偏光板を用い、速度300m/min、90度で剥離時の剥離力を測定し、その結果を下記表2に示した(2N/cm超過:OK、2N/cm以下:NG)。
上記実施例及び比較例で製造された接着剤の粘度を25℃で測定し、粘度測定にはViscometer TV−22(TOK SANGYO)を用い、その結果を下記表2に示した。
示差走査熱量計(DSC Mettler社)を利用して接着層のガラス転移温度(Tg)を確認した。上記のような硬化条件で製造された偏光板の接着層を分離してから、−50〜150℃に昇温させてセカンドラン(second run)でのガラス転移温度を測定し、その結果を下記表2に示した。
ガラスラミネーション(glass lamination)された偏光板の耐久評価(−40度〜80度、100cycle)を行った後、偏光板の外観を評価し(変形なし:OK、PVAクラック発生時:NG)、その結果を下記表2に示した。
2a 保護フィルムまたは補償フィルム
2b 保護フィルム
3 接着剤層
P 偏光板
C 液晶セル(cell)
Claims (18)
- 親水性基を有する1種以上のアクリル系モノマー、ラジカル重合開始剤、エポキシ樹脂、カチオン性光重合開始剤、及び、単官能疎水性モノマーを含み、
前記単官能疎水性モノマーは、イソボルニルアクリレート(IBOA)、ベンジル(メタ)アクリレート、ノニル(メタ)アクリレート、イソブチル(メタ)アクリレート、イソデシルアクリレート、ラウリルアクリレート、ステアリルアクリレート、2−エチルヘキシルアクリレート、ポリエチレングリコールメタアクリレート、オクチル/デシルアクリレート、フェノキシエチルアクリレート(PEA)、ノニルフェノールエトキシレートアクリレート、ジシクロペンテニルアクリレート、ジシクロペンテニルオキシエチルアクリレート、プロピレングリコールモノ(メタ)アクリレート及びエトキシエトキシエチルアクリレートからなる群より選択される少なくとも1つのモノマーを含み、
前記エポキシ樹脂はエポキシ化脂肪族環基を1つ以上含む第1エポキシ化合物及びグリシジルエーテル基を1つ以上含む第2エポキシ化合物の組合せからなる、
接着剤組成物。 - 前記親水性基を有する1種以上のアクリル系モノマー20〜80重量部、前記ラジカル重合開始剤0.5〜10重量部、前記エポキシ樹脂30〜80重量部及び前記カチオン性光重合開始剤1〜10重量部を含む請求項1に記載の接着剤組成物。
- 前記親水性基を有する1種以上のアクリル系モノマー20〜50重量部、前記ラジカル重合開始剤0.5〜5重量部、前記エポキシ樹脂20〜60重量部及び前記カチオン性光重合開始剤1〜7重量部を含む請求項1に記載の接着剤組成物。
- 前記親水性基を有する1種以上のアクリル系モノマー30重量部、前記ラジカル重合開始剤3重量部、前記エポキシ樹脂40重量部及び前記カチオン性光重合開始剤3重量部を含む請求項1から3の何れか1項に記載の接着剤組成物。
- 前記親水性基はヒドロキシ基(−OH)である請求項1から4の何れか1項に記載の接着剤組成物。
- 前記第1エポキシ化合物は、3,4−エポキシシクロヘキシルメチル−3,4−エポキシシクロへキサンカルボキシレート、ビス(3,4−エポキシシクロヘキシルメチル)アジペートジシクロペンタジエンジオキシド、リモネンジオキシド及び4−ビニルシクロヘキセンジオキシドからなる群より選択された請求項1から5のいずれか1項に記載の接着剤組成物。
- 前記第2エポキシ化合物は、1,4−シクロヘキサンジメタノールジグリシジルエーテル、ノボラック系エポキシ、ビスフェノールA系エポキシ、ビスフェノールF系エポキシ、ブロム化ビスフェノール系エポキシ、1,6−ヘキサンジオールジグリシジルエーテル、トリメチロールプロパントリグリシジルエーテル、n−ブチルグリシジルエーテル、脂肪族グリシジルエーテル(C12−C14)、2−エチルヘキシルグリシジルエーテル、フェニルグリシジルエーテル、o−クレシル(Cresyl)グリシジルエーテル、及びノニルフェニルグリシジルエーテルからなる群より選択された請求項1から6のいずれか1項に記載の接着剤組成物。
- 接着剤組成物100重量部に対し、前記第1エポキシ化合物15〜40重量部及び前記第2エポキシ化合物15〜40重量部を含む請求項1から7の何れか1項に記載の接着剤組成物。
- 前記第1エポキシ化合物及び前記第2エポキシ化合物は3:1〜1:3の重量比で含まれる請求項1から8の何れか1項に記載の接着剤組成物。
- 前記親水性基を有するアクリルモノマーは、ヒドロキシエチルアクリレート(Hydroxyethyl acrylate、HEA)、ヒドロキシエチルメタクリレート、ヒドロキシプロピルアクリレート、ヒドロキシプロピルメタクリレート、ヒドロキシブチルアクリレート及びこれらの混合物からなる群より選択された請求項1から9の何れか1項に記載の接着剤組成物。
- 前記接着剤組成物は全体接着剤組成物100重量部に対し、0超過50重量部の前記単官能疎水性モノマーを含む請求項1から10の何れか1項に記載の接着剤組成物。
- 前記単官能疎水性モノマーは、フェノキシエチルアクリレート(Penoxyethyl acrylate、PEA)及びイソボルニルアクリレート(Isobornyl acrylate、IBOA)である請求項1から11のいずれか1項に記載の接着剤組成物。
- 前記接着剤組成物は接着剤組成物100重量部に対し、ヒドロキシエチルアクリレート20〜80重量部、フェノキシエチルアクリレート0超過30以下重量部、イソボルニルアクリレート0超過20以下重量部、エポキシ樹脂30〜80重量部、カチオン性光重合開始剤1〜7重量部及びラジカル重合開始剤0.5〜5重量部を含む請求項12に記載の接着剤組成物。
- 前記接着剤組成物は、25℃で10cP〜30cPの粘度を有する請求項1から13の何れか1項に記載の接着剤組成物。
- 前記接着剤組成物は、ウレタンアクリレートを0超過4以下の重量部でさらに含む請求項1から14の何れか1項に記載の接着剤組成物。
- 偏光子と、
前記偏光子の一面または両面に付着される高分子フィルムと、
前記偏光子と前記高分子フィルムを付着させるための接着層を含み、
前記接着層は、請求項1から15の何れか1項に記載の接着剤組成物からなる偏光板。 - 前記高分子フィルムは、アクリル系フィルム、PETフィルム、アクリル系プライマー処理されたPETフィルム、TACフィルム、COPフィルム、ポリカーボネートフィルム及びポリノルボルネン(PNB)系フィルムからなる群より選択された少なくとも1つである請求項16に記載の偏光板。
- 請求項16または17に記載の偏光板を含む光学素子。
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