JP2008058768A - 偏光子保護フィルム、偏光板、および画像表示装置 - Google Patents
偏光子保護フィルム、偏光板、および画像表示装置 Download PDFInfo
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- JP2008058768A JP2008058768A JP2006237422A JP2006237422A JP2008058768A JP 2008058768 A JP2008058768 A JP 2008058768A JP 2006237422 A JP2006237422 A JP 2006237422A JP 2006237422 A JP2006237422 A JP 2006237422A JP 2008058768 A JP2008058768 A JP 2008058768A
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- polarizer
- meth
- polarizing plate
- film
- protective film
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
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- B32B2255/26—Polymeric coating
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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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
- B32B2307/7145—Rot proof, resistant to bacteria, mildew, mould, fungi
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- B32B2457/00—Electrical equipment
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Abstract
【解決手段】本発明の偏光子保護フィルムは、(メタ)アクリル系樹脂(A)を主成分として含むフィルムの少なくとも一方の面に、(メタ)アクリル系樹脂(B)を主成分として含む塗布層を有する。
【選択図】図1
Description
本発明に係る偏光子保護フィルムは、(メタ)アクリル系樹脂(A)を主成分として含むフィルムを含む。また、本発明に係る偏光子保護フィルムは、(メタ)アクリル系樹脂(B)を主成分として含む塗布層を含む。
YI=[(1.28X−1.06Z)/Y]×100
本発明の偏光板は、本発明の偏光子保護フィルムの一方の面側であって塗布層を有する面側に偏光子を有する。
架橋剤は、ポリビニルアルコール系樹脂と反応性を有する官能基を少なくとも2つ有する化合物を使用できる。例えば、エチレンジアミン、トリエチレンアミン、ヘキサメチレンジアミン等のアルキレン基とアミノ基を2個有するアルキレンジアミン類(なかでもヘキサメチレンジアミンが好ましい);トリレンジイソシアネート、水素化トリレンジイソシアネート、トリメチレンプロパントリレンジイソシアネートアダクト、トリフェニルメタントリイソシアネート、メチレンビス(4−フェニルメタントリイソシアネート、イソホロンジイソシアネートおよびこれらのケトオキシムブロック物またはフェノールブロック物等のイソシアネート類;エチレングリコールジグリシジルエーテル、ポリエチレングリコールジグリシジルエーテル、グリセリンジまたはトリグリシジルエーテル、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、ジグリシジルアニリン、ジグリシジルアミン等のエポキシ類;ホルムアルデヒド、アセトアルデヒド、プロピオンアルデヒド、ブチルアルデヒド等のモノアルデヒド類;グリオキザール、マロンジアルデヒド、スクシンジアルデヒド、グルタルジアルデヒド、マレインジアルデヒド、フタルジアルデヒド等のジアルデヒド類;メチロール尿素、メチロールメラミン、アルキル化メチロール尿素、アルキル化メチロール化メラミン、アセトグアナミン、ベンゾグアナミンとホルムアルデヒドとの縮合物等のアミノ−ホルムアルデヒド樹脂;更にナトリウム、カリウム、マグネシウム、カルシウム、アルミニウム、鉄、ニッケル等の二価金属、又は三価金属の塩及びその酸化物;などが挙げられる。架橋剤としては、メラミン系架橋剤が好ましく、特にメチロールメラミンが好適である。
次に、本発明の画像表示装置について説明する。本発明の画像表示装置は本発明の偏光板を少なくとも1枚含む。ここでは一例として液晶表示装置について説明するが、本発明が偏光板を必要とするあらゆる表示装置に適用され得ることはいうまでもない。本発明の偏光板が適用可能な画像表示装置の具体例としては、エレクトロルミネッセンス(EL)ディスプレイ、プラズマディスプレイ(PD)、電界放出ディスプレイ(FED:Field Emission Display)のような自発光型表示装置が挙げられる。図2は、本発明の好ましい実施形態による液晶表示装置の概略断面図である。図示例では透過型液晶表示装置について説明するが、本発明が反射型液晶表示装置等にも適用されることはいうまでもない。
昭和電工(株)製のShodex GPC system−21Hを用い、ポリスチレン換算で測定した。
重合体を一旦テトラヒドロフランに溶解し、過剰のヘキサンもしくはトルエンへ投入して再沈殿を行い、ろ過して取り出した沈殿物を減圧乾燥(80℃/1mmHg(1.33hPa)、3時間以上)することによって揮発成分を除去し、得られた樹脂についてDSC装置(リガク(株)製、DSC8230)を用いて測定した。
脱アルコール反応率を、重合で得られた重合体組成からすべての水酸基がメタノールとして脱アルコールした際に起こる重量減少量を基準にし、ダイナミックTG測定において重量減少が始まる前の150℃から重合体の分解が始まる前の300℃までの脱アルコール反応による重量減少から求めた。
すなわち、ラクトン環構造を有した重合体のダイナミックTG測定において150℃から300℃までの間の重量減少率の測定を行い、得られた実測重量減少率を(X)とする。他方、当該重合体の組成から、その重合体組成に含まれる全ての水酸基がラクトン環の形成に関与するためアルコールになり脱アルコールすると仮定した時の理論重量減少率(すなわち、その組成上において100%脱アルコール反応が起きたと仮定して算出した重量減少率)を(Y)とする。なお、理論重量減少率(Y)は、より具体的には、重合体中の脱アルコール反応に関与する構造(水酸基)を有する原料単量体のモル比、すなわち当該重合体組成における前記原料単量体の含有率から算出することができる。これらの値(X、Y)を脱アルコール計算式:
1−(実測重量減少率(X)/理論重量減少率(Y))
に代入してその値を求め、%で表記すると、脱アルコール反応率(ラクトン環化率)が得られる。
メルトフローレートは、JIS−K6874に基づき、試験温度240℃、荷重10kgで測定した。
粘着剤型偏光板を液晶セルのガラス板に貼付け、試験サンプルとした。一つの角より対角線方向へ1mm/secの速度で90度方向へ剥離し、剥離位置の確認を行った。判定は以下のように行った。
○:偏光板は破壊されることなく、粘着剤とガラス板との界面で剥離
×:偏光子保護フィルムと偏光子との界面で剥離
厚さ80μmのポリビニルアルコールフィルムを、5重量%(重量比:ヨウ素/ヨウ化カリウム=1/10)のヨウ素水溶液中で染色した。次いで、3重量%のホウ酸および2重量%ヨウ化カリウムを含む水溶液に浸漬し、さらに4重量%のホウ酸および3重量%のヨウ化カリウムを含む水溶液中で5.5倍まで延伸した後、5重量%のヨウ化カリウム水溶液に浸漬した。その後、40℃のオーブンで3分間乾燥を行い、厚さ30μmの偏光子を得た。
撹拌装置、温度センサー、冷却管、窒素導入管を備えた30L反応釜に、8000gのメタクリル酸メチル(MMA)、2000gの2−(ヒドロキシメチル)アクリル酸メチル(MHMA)、10000gのトルエンを仕込み、これに窒素を通じつつ105℃まで昇温し、還流したところで、開始剤として10.0gのターシャリーアミルパーオキシイソノナノエート(アトフィナ吉富製、商品名:ルパゾール570)を添加すると同時に、20.0gの開始剤と100gのトルエンからなる溶液を4時間かけて滴下しながら、還流下(約105〜110℃)で溶液重合を行い、さらに4時間かけて熟成を行った。
得られた重合体溶液に、10gのリン酸ステアリル/リン酸ジステアリル混合物(堺化学製、商品名:Phoslex A−18)を加え、還流下(約90〜110℃)で5時間、環化縮合反応を行った。次いで、上記環化縮合反応で得られた重合体溶液を、バレル温度260℃、回転数100rpm、減圧度13.3〜400hPa(10〜300mmHg)、リアベント数1個、フォアベント数4個のベントタイプスクリュー二軸押出し機(Φ=29.75mm、L/D=30)に、樹脂量換算で2.0kg/時間の処理速度で導入し、該押出し機内で環化縮合反応と脱揮を行い、押出すことにより、透明な(メタ)アクリル系樹脂のペレットを得た。
得られた(メタ)アクリル系樹脂のペレットのラクトン環化率は97.0%、質量平均分子量は147700、メルトフローレートは11.0g/10分、Tg(ガラス転移温度)は130℃であった。
アセトアセチル基変性したポリビニルアルコール樹脂100重量部(アセチル化度13%)に対してメチロールメラミン20重量部を含む水溶液を、濃度0.5重量%になるように調整したポリビニルアルコール系接着剤水溶液を調製した。
(偏光子保護フィルム)
押出機に、製造例2で得られた(メタ)アクリル系樹脂を供給し、250℃で溶融混錬後、Tダイから押出して、冷却ロールで水冷して引取り、厚み100μmのフィルムを得た。この後、逐次二軸押出機で、縦延伸1.8倍(加熱温度140℃)、つづいて横延伸2.4倍(加熱温度140℃)し、厚み30μmの二軸延伸フィルムを得た。
さらに、製造例2で得られた(メタ)アクリル系樹脂を、メチルイソブチルケトン(MIBK)/メチルエチルケトン(MEK)=7/3の混合溶剤に溶解し、塗工液を調製した。塗工液中の(メタ)アクリル系樹脂の濃度は3重量%であった。次に、調製した塗工液を、上記で得られた二軸延伸フィルムの一方の面に、ワイヤーバーを用いて塗布し、室温で風乾させた。塗布によって形成された塗布層の厚みは1μmであった。このようにして、偏光子保護フィルム(1A)を得た。
(易接着層の形成)
シランカップリング剤(東レ・ダウコーニング・シリコーン株式会社製、商品名:APZ−6661)100部に対しイソプロピルアルコールを66.7部加えることにより調製した溶液を、ワイヤーバー♯5で上記偏光子保護フィルム(1A)の一方の面に塗布し、90℃で2分乾燥させた。蒸発後の易接着層の厚みは50nmであった。
(偏光板の作製)
製造例1で得られた偏光子の片面に上記偏光子保護フィルム(1A)の易接着層面が、もう一方の面にはけん化処理されたトリアセチルセルロース(富士写真フィルム社製、商品名:T−40UZ)が接するように、製造例3で調製したポリビニルアルコール系接着剤水溶液を用いて貼り合わせた。ポリビニルアルコール系接着剤水溶液は、それぞれ偏光子保護フィルム(1A)の易接着層面側、トリアセチルセルロース側に塗布し、70℃で10分間乾燥させて偏光板(1B)を得た。
(粘着剤層の形成)
ベースポリマーとして、ブチルアクリレート:アクリル酸:2−ヒドロキシエチルアクリレート=100:5:0.1(重量比)の共重合体からなる重量平均分子量200万のアクリル系ポリマーを含有する溶液(固形分30%)を用いた。上記アクリル系ポリマー溶液にイソシアネート系多官能性化合物である日本ポリウレタン社製コロネートLをポリマー固形分100部に対して4部、および添加剤(KBM403、信越シリコーン製)を0.5部、粘度調整のための溶剤(酢酸エチル)を加え、粘着剤溶液(固形分12%)を調製した。当該粘着剤溶液を、乾燥後の厚みが25μmとなるように、離型フィルム(ポリエチレンテレフタレート基材:ダイヤホイルMRF38、三菱化学ポリエステル製)上に塗布した後、熱風循環式オーブンで乾燥して、粘着剤層を形成した。
(偏光板アンカー層)
ポリアクリル酸エステルのポリエチレンイミン付加物(日本触媒社製、商品名ポリメントNK380)をメチルイソブチルケトンで50倍に希釈した。これを上記偏光板(1B)の片面に、ワイヤーバー#5を用いて、乾燥後の厚みが50nmとなるように塗布乾燥した。
(粘着剤型偏光板の作製)
上記偏光板(1B)の片面に設けたアンカー層に、上記粘着剤層を形成した離型フィルムを貼り合わせ、粘着剤型偏光板(1C)を作製した。
(偏光板の評価)
得られた偏光板における偏光子保護フィルムと偏光子の接着性をリワーク試験によって評価した。評価の結果は○であり、偏光板(1B)は破壊されることなく、粘着剤とガラス板との界面で剥離できた。
偏光子保護フィルムに塗布層を設けない以外は実施例1と同様に行い、偏光子保護フィルム(C1A)、偏光板(C1B)、粘着剤型偏光板(C1C)を作製した。
(偏光板の評価)
得られた偏光板における偏光子保護フィルムと偏光子の接着性をリワーク試験によって評価した。評価の結果は×であり、偏光子保護フィルム(C1A)と偏光子との界面で剥離が起こった。剥離面を分析したところ、両面から製造例2で得られた(メタ)アクリル系樹脂の成分が検出され、偏光子保護フィルム(C1A)の表面付近で凝集破壊が起こっているものと推察された。
撹拌装置、温度センサー、冷却管、窒素導入管を備えた30L反応釜に、8000gのメタクリル酸メチル(MMA)、10000gのトルエンを仕込み、これに窒素を通じつつ105℃まで昇温し、還流したところで、開始剤として10.0gのターシャリーアミルパーオキシイソノナノエート(アトフィナ吉富製、商品名:ルパゾール570)を添加すると同時に、20.0gの開始剤と100gのトルエンからなる溶液を4時間かけて滴下しながら、還流下(約105〜110℃)で溶液重合を行い、さらに4時間かけて熟成を行った。
得られた重合体溶液を、バレル温度260℃、回転数100rpm、減圧度13.3〜400hPa(10〜300mmHg)、リアベント数1個、フォアベント数4個のベントタイプスクリュー二軸押出し機(Φ=29.75mm、L/D=30)に、樹脂量換算で2.0kg/時間の処理速度で導入し、押出すことにより、透明な(メタ)アクリル系樹脂のペレットを得た。
得られた(メタ)アクリル系樹脂のペレットの質量平均分子量は100000、メルトフローレートは18.0g/10分、Tg(ガラス転移温度)は110℃であった。
実施例1において製造例2で得られた(メタ)アクリル系樹脂の代わりに上記のようにして得られた(メタ)アクリル系樹脂を用いた以外は実施例1と同様に行い、偏光子保護フィルム(2A)、偏光板(2B)、粘着剤型偏光板(2C)を作製した。
得られた偏光板における偏光子保護フィルムと偏光子の接着性をリワーク試験によって評価した。評価の結果は○であり、偏光板(2B)は破壊されることなく、粘着剤とガラス板との界面で剥離できた。
11、11´ ガラス基板
12 液晶層
13 スペーサー
20、20´ 位相差フィルム
30、30´ 偏光板
31 偏光子
32 接着剤層
33 易接着層
34 偏光子保護フィルム
35 接着剤層
36 偏光子保護フィルム
40 導光板
50 光源
60 リフレクター
100 液晶表示装置
Claims (11)
- (メタ)アクリル系樹脂(A)を主成分として含むフィルムの少なくとも一方の面に、(メタ)アクリル系樹脂(B)を主成分として含む塗布層を有する、偏光子保護フィルム。
- 前記塗布層の厚みが0.005μm〜3μmである、請求項1に記載の偏光子保護フィルム。
- 前記(メタ)アクリル系樹脂(A)と(メタ)アクリル系樹脂(B)とが同じ種類の樹脂である、請求項1または2に記載の偏光子保護フィルム。
- 前記(メタ)アクリル系樹脂(A)を主成分として含むフィルムが、溶融押出しによって得られるフィルムである、請求項1から3までのいずれかに記載の偏光子保護フィルム。
- 前記塗布層が、(メタ)アクリル系樹脂(B)を溶剤に溶解して得られる塗工液を塗布して得られる塗布層である、請求項1から4までのいずれかに記載の偏光子保護フィルム。
- 請求項1から5までのいずれかに記載の偏光子保護フィルムの一方の面側であって塗布層を有する面側に偏光子を有する、偏光板。
- 前記塗布層と偏光子との間に接着剤層を有する、請求項6に記載の偏光板。
- 前記塗布層と接着剤層との間に易接着層を有する、請求項7に記載の偏光板。
- 前記偏光子の前記偏光子保護フィルムと反対の面側にセルロース系樹脂フィルムを有する、請求項6から8までのいずれかに記載の偏光板。
- 最外層の少なくとも一方として粘着剤層をさらに有する、請求項6から9までのいずれかに記載の偏光板。
- 請求項6から10までのいずれかに記載の偏光板を少なくとも1枚含む、画像表示装置。
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JP2006237422A JP5268083B2 (ja) | 2006-09-01 | 2006-09-01 | 偏光子保護フィルム、偏光板、および画像表示装置 |
PCT/JP2007/064223 WO2008026396A1 (en) | 2006-09-01 | 2007-07-19 | Protective film for polarizer, polarizing plate, and image display device |
KR1020137010057A KR101430890B1 (ko) | 2006-09-01 | 2007-07-19 | 편광자 보호 필름, 편광판, 및 화상 표시 장치 |
KR1020117030900A KR20120006081A (ko) | 2006-09-01 | 2007-07-19 | 편광자 보호 필름, 편광판, 및 화상 표시 장치 |
CN201510080140.9A CN104597532A (zh) | 2006-09-01 | 2007-07-19 | 偏振片保护膜、偏振板以及图像显示装置 |
CNA2007800324808A CN101512399A (zh) | 2006-09-01 | 2007-07-19 | 偏振片保护膜、偏振板以及图像显示装置 |
KR1020097004071A KR20090046885A (ko) | 2006-09-01 | 2007-07-19 | 편광자 보호 필름, 편광판, 및 화상 표시 장치 |
US12/439,674 US8475931B2 (en) | 2006-09-01 | 2007-07-19 | Polarizer protective film, polarizing plate, and image display apparatus |
TW96129067A TWI398677B (zh) | 2006-09-01 | 2007-08-07 | A polarizing element protective film, a polarizing plate, and an image display device |
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JP2013210512A (ja) * | 2012-03-30 | 2013-10-10 | Nitto Denko Corp | 偏光素子、光学フィルムおよび画像表示装置 |
JP2014010292A (ja) * | 2012-06-29 | 2014-01-20 | Nitto Denko Corp | 円偏光板および有機elパネル |
JP2014219445A (ja) * | 2013-05-01 | 2014-11-20 | 日東電工株式会社 | 偏光板、その製造方法、光学フィルムおよび画像表示装置 |
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Also Published As
Publication number | Publication date |
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JP5268083B2 (ja) | 2013-08-21 |
KR101430890B1 (ko) | 2014-08-18 |
US20100002298A1 (en) | 2010-01-07 |
CN101512399A (zh) | 2009-08-19 |
KR20090046885A (ko) | 2009-05-11 |
TWI398677B (zh) | 2013-06-11 |
KR20130062358A (ko) | 2013-06-12 |
TW200815805A (en) | 2008-04-01 |
CN104597532A (zh) | 2015-05-06 |
WO2008026396A1 (en) | 2008-03-06 |
KR20120006081A (ko) | 2012-01-17 |
US8475931B2 (en) | 2013-07-02 |
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