JP2010117516A - 偏光板の製造方法、偏光板、光学フィルムおよび画像表示装置 - Google Patents
偏光板の製造方法、偏光板、光学フィルムおよび画像表示装置 Download PDFInfo
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Classifications
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Abstract
【解決手段】偏光子の片面に、接着剤層を介して透明保護フィルムが設けられている偏光板の製造方法であって、偏光子の少なくとも一方の面に、真空紫外線を照射して、偏光子の表面を処理する工程(A)と、仮偏光板を製造するために、前記表面処理工程(A)を施した偏光子の面に、第一透明保護フィルムを、第一接着剤層を介して貼り合せる工程(B)と、前記仮偏光板から、前記第一透明保護フィルムとともに前記表面処理された偏光子の表面層を剥離する工程(C)、を有することを特徴とする偏光板の製造方法。
【選択図】図1
Description
偏光子の収縮力を小さくすることも考えられるが、収縮力を小さくできるほど延伸倍率を低下させるとヨウ素錯体の配向性そのものも小さくなり、深刻な光学特性の低下を引き起こすとともに、延伸の均一性を損ない、良好な特性の偏光板を得ることが困難であった。
偏光子の少なくとも一方の面に、真空紫外線を照射して、偏光子の表面を処理する工程(A)と、
仮偏光板を製造するために、前記表面処理工程(A)を施した偏光子の面に、第一透明保護フィルムを、第一接着剤層を介して貼り合せる工程(B)と、
前記仮偏光板から、前記第一透明保護フィルムとともに前記表面処理された偏光子の表面層を剥離する工程(C)、を有することを特徴とする偏光板の製造方法、に関する。
剥離された表面層からなる偏光子の当該剥離に係る面とは反対側の片面に、第一接着剤層を介して第一透明保護フィルムが設けられていることを特徴とする偏光板、に関する。
原反ポリビニルアルコールフィルム[(株)クラレ製,商品名「VF‐PS」,厚さ75μm]を用いた。当該原反フィルムを連続延伸装置に送り出して、下記の順番にて、下記各工程を施した。
膨潤浴の処理液としては、30℃に調整した純水を用いた。上記ポリビニルアルコールフィルムを膨潤浴に搬送し、純水中に浸漬し、膨潤させながら、フィルムの長手方向(MD方向)に1.5倍一軸延伸した。
染色浴の処理液としては、水:ヨウ化カリウム:ヨウ素(重量比=280:7:1)の割合で含む30℃に調整したヨウ素染色溶液を用いた。上記膨潤処理されたポリビニルアルコールフィルムを染色浴に搬送し、浸漬しながら、元長に対して延伸倍率2.20倍の長さになるようにMD方向に一軸延伸しながら、染色した。
架橋浴の処理液としては、ホウ酸を3重量%、ヨウ化カリウムを3重量%含有する60℃に調整したホウ酸水溶液を用いた。上記染色処理されたポリビニルアルコールフィルムを架橋浴に搬送し、浸漬しながら、元長に対して延伸倍率3.30倍の長さになるようにMD方向に一軸延伸した。
延伸浴の処理液としては、ホウ酸を4重量%、ヨウ化カリウムを5重量%含有する60℃に調整したホウ酸水溶液を用いた。上記架橋処理されたポリビニルアルコールフィルムを延伸浴に搬送し、浸漬しながら、元長に対して総延伸倍率5.80倍まで、一軸延伸した。
洗浄浴の処理液としては、30℃に調整したヨウ化カリウムを3重量%含有する水溶液を用いた。上記延伸処理されたポリビニルアルコールフィルムを洗浄浴に搬送し、浸漬した。次いで、上記処理されたポリビニルアルコール系フィルムを、60℃で乾燥して、偏光子(厚み25μm)を得た。
(表面処理工程(A))
製造例で得られた偏光子の片面に、ウシオ電機(株)製のエキシマランプUER20H‐172Bを用い、中心波長172nm(半値幅30nm)で強度10mW/cm2の真空紫外光を60秒間照射した。このとき、ランプハウス内は、窒素でパージした。
上記表面処理の施された偏光子の片面と、透明保護フィルム(コニカミノルタオプト(株)製のTACフィルムKC4UK,厚さ40μm)を、ポリウレタン接着剤(三井化学ポリウレタン(株)製のNM89‐50G,湿気硬化型で一液型,溶剤系)により貼り合せた。貼り合せは、前記透明保護フィルム側に、乾燥後の厚さが3μmとなるように接着剤を塗工した後に、偏光子に貼り合せた。次いで、これを、ロール機で貼り合せた。その後、60℃で10分間乾燥して、表面処理の施された偏光子の片面に透明保護フィルムを有する仮偏光板を得た。
上記仮偏光板の偏光子側をステンレス板に、上記貼り合せ工程(B)で用いたものと同様の接着剤により貼り合せた後、仮偏光板から透明保護フィルムを、180°ピールにより剥離した。その結果、透明保護フィルムの片面に、厚み3μmの接着剤層を介して厚み約2μmの偏光子表面層が接着された偏光板を得た。当該偏光板の厚みは45μmであった。図8に、得られた偏光板の偏光子部分に係る走査電子顕微鏡による断面写真を示す。図8から接着剤層の厚みは2.8μm、偏光子層の厚みは2μmであることが分かる。
実施例1において、表面処理工程(A)における、真空紫外光の照射時間を30秒間に変えたこと以外は、実施例1と同様にして片面および両面に透明保護フィルムを有する偏光板を作成した。片面に透明保護フィルムを有する偏光板の厚みは45μm、両面に透明保護フィルムを有する偏光板の厚みは88μm、であった。
実施例1において、表面処理工程(A)における、真空紫外光の照射時間を5秒間に変えたこと以外は、実施例1と同様にして片面および両面に透明保護フィルムを有する偏光板を作成した。片面に透明保護フィルムを有する偏光板の厚みは45μm、両面に透明保護フィルムを有する偏光板の厚みは88μm、であった。
実施例1において、表面処理工程(A)における、真空紫外光の照射時間を200秒間に変えたこと以外は、実施例1と同様にして片面および両面に透明保護フィルムを有する偏光板を作成した。片面に透明保護フィルムを有する偏光板の厚みは45μm、両面に透明保護フィルムを有する偏光板の厚みは88μm、であった。
(表面処理工程(A))
製造例で得られた偏光子の片面に、ウシオ電機(株)製のエキシマランプUER20H‐126VBを用い、中心波長126nm(半値幅30nm)で強度7.5mW/cm2の真空紫外光を60秒間照射した。このとき、ランプハウス内は、窒素でパージした。
(表面処理工程(A))
製造例で得られた偏光子の両面に、ウシオ電機(株)製のエキシマランプUER20H‐172Bを用い、中心波長172nm(半値幅30nm)で強度10mW/cm2の真空紫外光を60秒間照射した。このとき、ランプハウス内は、窒素でパージした。
上記表面処理の施された偏光子の両面に、実施例1と同様の透明保護フィルム、接着剤を用いて、同様の方法により貼り合せて、表面処理の施された偏光子の両面に透明保護フィルムを有する仮偏光板を得た。
上記仮偏光板の片側から一方の透明保護フィルムを、180°ピールにより剥離した。その後、もう一方の透明保護フィルムを、180°ピールにより剥離した。その結果、いずれの場合にも、透明保護フィルムの片面に、厚み3μmの接着剤層を介して厚み約2μmの偏光子表面層が接着された偏光板を得た。当該偏光板の厚みはいずれも45μmであった。
実施例1において、製造例で得られた偏光子に表面処理工程(A)を施すことなく、貼り合せ工程(B)を施して、偏光子の片面に透明保護フィルムを有する偏光板を得た。当該偏光板について、実施例1と同様の剥離工程(C)を行ったが、透明保護フィルムを剥離することができなかった。
(表面処理工程(A´))
製造例で得られた偏光子の両面に、ウシオ電機(株)製のエキシマランプUER20H‐222Bを用い、中心波長222nm(半値幅8nm)で強度8.5mW/cm2の紫外光を60秒間照射した。このとき、ランプハウス内は、窒素でパージした。
上記表面処理の施された偏光子の両面に、実施例1と同様の透明保護フィルム、接着剤を用いて、同様の方法により貼り合せて、表面処理の施された偏光子の両面に透明保護フィルムを有する仮偏光板を得た。
上記仮偏光板の偏光子側をステンレス板に、実施例1と同様の剥離を試みたが、透明保護フィルムが破断して剥離することはできなかった。
比較例2において、表面処理工程(A´)における、真空紫外光の照射時間を200秒間に変えたこと以外は、実施例1と同様の操作を行ったが、比較例2と同様に、剥離工程(C)において、透明保護フィルムが破断して剥離することはできなかった。
(表面処理工程(A´))
製造例で得られた偏光子の両面に、アイグラフィックス(株)製の高圧水銀ランプ(メタルハライドランプ)を用い、強度40mW/cm2の紫外光を30秒間照射した。このとき、ランプハウス内は、窒素でパージした。
上記表面処理の施された偏光子の両面に、実施例1と同様の透明保護フィルム、接着剤を用いて、同様の方法により貼り合せて、表面処理の施された偏光子の両面に透明保護フィルムを有する仮偏光板を得た。
上記仮偏光板の偏光子側をステンレス板に、実施例1と同様の剥離を試みたが、透明保護フィルムが破断して剥離することはできなかった。
実施例および比較例で得られた、偏光板について下記評価を行った。結果を表1に示す。表1には、各例の偏光板の製造条件、得られた偏光板の厚みも示す。
得られた偏光板を、偏光子の吸収軸を長手方向にして、200mm×100mmに切断したもの(偏光板が片面にのみ透明保護フィルムを有する場合にはその透明保護フィルム側)を、縦210mm×横110mm×厚み0.7mmのガラス板にアクリル系粘着剤を介して片側に貼り合せた、偏光板付きのガラス板をサンプルとした。当該サンプルを、60℃、90%RHの条件で24時間加熱加湿環境下に置いた後に、その反り量を測定した。図9に示すように、前記サンプルはガラス面を外側にして、偏光子の遅相軸側に反った。反り量の測定は、サンプルの偏光板10を上に向けて水平定盤Tの上に置き、ガラス板Gの四隅のうち、最も大きく反った部分の定盤からの浮きの量(d:mm)を測定した。測定は実施例では隙間ゲージを用いたが、比較例では反りが大きすぎて隙間ゲージでは測定できなかったため、ノギスで測定した。
偏光度(%)={(H0−H90)/(H0+H90)}1/2×100
各透過率は、JIS Z8701−1982に規定の2度視野(C光源)により視感度補整したY値を測定して求めた。
1x 偏光子
1y 親水性ポリマーフィルム
2a 第一透明保護フィルム
2b 第二透明保護フィルム
2c 透明保護層
3a 第一接着剤層
3b 第二接着剤層
10a、b、c 偏光板
10´ 仮偏光板
A 表面処理工程(A)
B 貼り合せ工程(B)
C 剥離工程(C)
S 真空紫外線照射装置
Claims (11)
- 偏光子の片面に、接着剤層を介して透明保護フィルムが設けられている偏光板の製造方法であって、
偏光子の少なくとも一方の面に、真空紫外線を照射して、偏光子の表面を処理する工程(A)と、
仮偏光板を製造するために、前記表面処理工程(A)を施した偏光子の面に、第一透明保護フィルムを、第一接着剤層を介して貼り合せる工程(B)と、
前記仮偏光板から、前記第一透明保護フィルムとともに前記表面処理された偏光子の表面層を剥離する工程(C)、を有することを特徴とする偏光板の製造方法。 - 前記偏光子が、親水性ポリマーフィルムに、少なくとも、二色性物質による染色工程と延伸工程を施すことにより得られたものであることを特徴とする請求項1記載の偏光板の製造方法。
- 親水性ポリマーフィルムが、ポリビニルアルコール系フィルムであり、二色性物質がヨウ素であることを特徴とする請求項2記載の偏光板の製造方法。
- 前記偏光子が、親水性ポリマーフィルムに、さらに、膨潤工程および架橋工程から選ばれるいずれか少なくとも1つの工程を施すことにより得られたものであることを特徴とする請求項2または3記載の偏光板の製造方法。
- 前記表面処理工程(A)の真空紫外線の照射に用いる光源の強度が、中心波長に対して、50nm以下の半値幅を有することを特徴とする請求項1〜4のいずれかに記載の偏光板の製造方法。
- 前記表面処理工程(A)の真空紫外線の照射に用いる光源が、エキシマランプ、エキシマレーザまたは自由電子レーザであることを特徴とする請求項1〜5のいずれかに記載の偏光板の製造方法。
- 前記表面処理工程(A)乃至剥離工程(C)が、偏光子の両面に、順次または同時に施されることを特徴とする請求項1〜6のいずれかに記載の偏光板の製造方法。
- 請求項1〜7のいずれかに記載の製造方法により得られた、
剥離された表面層からなる偏光子の当該剥離に係る面とは反対側の片面に、第一接着剤層を介して第一透明保護フィルムが設けられていることを特徴とする偏光板。 - 請求項8記載の偏光板の前記剥離に係る面に、第二接着剤層を介して第二透明保護フィルムまたは透明保護層が設けられていることを特徴とする偏光板。
- 請求項8または9記載の偏光板が、少なくとも1枚積層されていることを特徴とする光学フィルム。
- 請求項8もしくは9記載の偏光板または請求項10記載の光学フィルムが用いられていることを特徴とする画像表示装置。
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