JP2008181079A - 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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- JP2008181079A JP2008181079A JP2007286143A JP2007286143A JP2008181079A JP 2008181079 A JP2008181079 A JP 2008181079A JP 2007286143 A JP2007286143 A JP 2007286143A JP 2007286143 A JP2007286143 A JP 2007286143A JP 2008181079 A JP2008181079 A JP 2008181079A
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Images
Classifications
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Abstract
【解決手段】本発明の偏光子保護フィルムは、樹脂層(A)と樹脂層(B1)とをこの順に有し、該樹脂層(A)は(メタ)アクリル系樹脂を主成分として含む樹脂層であって紫外線吸収剤を該樹脂層(A)中の樹脂成分に対して0.5〜10重量%の割合で含み、該樹脂層(B1)は(メタ)アクリル系樹脂以外の熱可塑性樹脂を主成分として含む樹脂層である。
【選択図】なし
Description
樹脂層(A)と樹脂層(B1)とをこの順に有し、
該樹脂層(A)は(メタ)アクリル系樹脂を主成分として含む樹脂層であって紫外線吸収剤を該樹脂層(A)中の樹脂成分に対して0.5〜10重量%の割合で含み、
該樹脂層(B1)は(メタ)アクリル系樹脂以外の熱可塑性樹脂を主成分として含む樹脂層である。
〔偏光子保護フィルム〕
本発明の偏光子保護フィルムは、樹脂層(A)と樹脂層(B1)とをこの順に有する。このような層構造を有することで、紫外線吸収剤を比較的多く含む樹脂層(A)からの紫外線吸収剤のブリードアウトを樹脂層(B1)によって抑制することが可能となり、例えば、押出し成形において、Tダイから押出されたフィルムの樹脂層(B1)側をキャストロールに巻き取る際の該ロール側とすることで、キャストロールへのロール付着物の発生を抑制できる。好ましくは、樹脂層(A)の樹脂層(B1)の反対側に樹脂層(B2)を有する。すなわち、好ましい実施形態として、図1に示すように、樹脂層(B1)1と樹脂層(A)2と樹脂層(B2)3とをこの順に有する。
YI=[(1.28X−1.06Z)/Y]×100
本発明の偏光板は、ポリビニルアルコール系樹脂から形成される偏光子と本発明の偏光子保護フィルムとを含む偏光板である。本発明の偏光板の好ましい実施形態の1つは、図2に示すように、偏光子31の一方の面が、接着剤層32および易接着層33を介して本発明の偏光子保護フィルム34に接着されてなり、偏光子31のもう一方の面が、接着剤層35を介して偏光子保護フィルム36に接着されてなる形態である。偏光子保護フィルム36は本発明の偏光子保護フィルムであってもよいし、別の任意の適切な偏光子保護フィルムであってもよい。また、接着剤層35と偏光子保護フィルム36の間に易接着層が存在していてもよい。
厚みが10μm未満の場合、薄膜用分光光度計[大塚電子(株)製 製品名「瞬間マルチ測光システム MCPD−2000」]を用いて測定した。厚みが10μm以上の場合、アンリツ製デジタルマイクロメーター「KC−351C型」を使用して測定した。
300℃で20分間の加熱における重量減少は、窒素気流中で300℃で20分間加熱した際の重量減少率で評価した。試料約5〜10mgを用い、熱重量分析装置(セイコーインスツルメンツ(株)製、TG/DTA6200)で窒素気流中において測定した。10℃/分で300℃まで昇温させた後、300℃で20分間保持した。処理前の重量=M0、処理後の重量=M1、重量減少率(%)=Mとした時、次式で計算した。
M=(M1−M0)/M0
得られた光学フィルムについて、日立ハイテクノロジーズ社製の日立分光光度計U−4100を用いて、380nmの光線透過率を測定した。
単軸の押出機にて共押出もしくは押出を行って製膜したフィルムを観察し、フィルムに見られる外観欠点の数を観察した。
◎:目視では外観欠点は確認されない。
○:直径(楕円状の場合は長径)0.1mm未満の外観欠点が観察される。
×:全面に直径(楕円状の場合は長径)0.1mm以上の外観欠点が観察される。
××:全面に直径(楕円状の場合は長径)0.1mm以上の外観欠点が多数観察される。
Tダイ出口のキャストロールへのロール付着物の有無を観察した。
○:キャストロールにロール付着物が観察されない。
×:キャストロールにロール付着物が観察される。
特開2005−146084号公報に記載のラクトン環含有アクリル系樹脂ペレットに対して、トリアゾール系紫外線吸収剤(ADEKA社製、アデカスタブLA−31)を5重量%、フェノール系酸化防止剤(ADEKA社製、アデカスタブAO−60)を0.3重量%、チオエーテル系酸化防止剤(ADEKA社製、アデカスタブAO−412S)を0.3重量%、2軸混練機にて250℃で混合し、樹脂ペレット(1)を作製した。
アクリロニトリル/スチレン共重合樹脂(旭化成ケミカルズ社製、スタイラックAS)ペレットに対して、トリアゾール系紫外線吸収剤(ADEKA社製、アデカスタブLA−31)を1重量%、フェノール系酸化防止剤(ADEKA社製、アデカスタブAO−60)を0.3重量%、チオエーテル系酸化防止剤(ADEKA社製、アデカスタブAO−412S)を0.3重量%、2軸混練機にて250℃で混合し、樹脂ペレット(2)を作製した。
ポリカーボネート樹脂(三菱エンジニアリングプラスチックス社製、ノバレックス)ペレットに対して、トリアゾール系紫外線吸収剤(ADEKA社製、アデカスタブLA−31)を1.0重量%、フェノール系酸化防止剤(ADEKA社製、アデカスタブAO−60)を0.3重量%、チオエーテル系酸化防止剤(ADEKA社製、アデカスタブAO−412S)を0.3重量%、2軸混練機にて250℃で混合し、樹脂ペレット(3)を作製した。
ポリエチレンナフタレート樹脂(帝人化成社製、テオネックス)ペレットに対して、フェノール系酸化防止剤(ADEKA社製、アデカスタブAO−60)を0.3重量%、チオエーテル系酸化防止剤(ADEKA社製、アデカスタブAO−412S)を0.3重量%、2軸混練機にて280℃で混合し、樹脂ペレット(4)を作製した。
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。
参考例1で得られた樹脂ペレット(1)と参考例2で得られた樹脂ペレット(2)とを、800Pa、100℃で12時間乾燥させた。その後、単軸の押出機2台を用いて、フィードブロック方式にてダイス温度280℃でTダイから共押出を行って製膜した後、2軸延伸機にて固定端の同時2軸延伸を行い、「樹脂ペレット(2)から得られる樹脂層/樹脂ペレット(1)から得られる樹脂層/樹脂ペレット(2)から得られる樹脂層」のフィルム構成を有する、フィルム総厚みが50μmの光学フィルム(1)を作製した。
光学フィルム(1)についての評価結果を表1に示す。
実施例1において、樹脂ペレット(2)に代えて、アクリロニトリル/スチレン共重合樹脂(旭化成ケミカルズ社製、スタイラックAS)を用いた以外は実施例1と同様に乾燥、製膜、延伸を行い、「アクリロニトリル/スチレン共重合樹脂から得られる樹脂層/樹脂ペレット(1)から得られる樹脂層/アクリロニトリル/スチレン共重合樹脂から得られる樹脂層」のフィルム構成を有する、フィルム総厚みが50μmの光学フィルム(2)を作製した。
光学フィルム(2)についての評価結果を表1に示す。
実施例1において、樹脂ペレット(2)に代えて樹脂ペレット(3)を用い、乾燥温度を120℃とし、乾燥時間を5時間とした以外は実施例1と同様に乾燥、製膜、延伸を行い、「樹脂ペレット(3)から得られる樹脂層/樹脂ペレット(1)から得られる樹脂層/樹脂ペレット(3)から得られる樹脂層」のフィルム構成を有する、フィルム総厚みが50μmの光学フィルム(3)を作製した。
光学フィルム(3)についての評価結果を表1に示す。
実施例1において、樹脂ペレット(2)に代えて樹脂ペレット(4)を用い、乾燥温度を120℃とし、乾燥時間を5時間とした以外は実施例1と同様に乾燥、製膜、延伸を行い、「樹脂ペレット(4)から得られる樹脂層/樹脂ペレット(1)から得られる樹脂層/樹脂ペレット(4)から得られる樹脂層」のフィルム構成を有する、フィルム総厚みが50μmの光学フィルム(4)を作製した。
光学フィルム(4)についての評価結果を表1に示す。
参考例1で得られた樹脂ペレット(1)を、800Pa、100℃で12時間乾燥させた。その後、単軸の押出機を用いて、ダイス温度280℃でTダイから押出を行って製膜した後、2軸延伸機にて固定端の同時2軸延伸を行い、フィルム総厚みが50μmの光学フィルム(C1)を作製した。
光学フィルム(C1)についての評価結果を表1に示す。
(接着剤)
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整した。
参考例5で得られた偏光子の両面に実施例1で得られた光学フィルム(1)を、ポリビニルアルコール系接着剤を用いて貼り合わせた。ポリビニルアルコール系接着剤は、それぞれ光学フィルム(1)側に塗布し、70℃で10分間乾燥させて偏光板を得た。
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。
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。これを偏光板の片面に、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。
上記偏光板のアンカー層に、上記粘着剤層を形成した離型フィルムを貼り合わせ、粘着剤型偏光板を作製した。
得られた偏光板における、フィルムと偏光子の接着性、および外観を評価した。接着性は良好であり、偏光子とフィルムとが一体化して剥がれが生じなかった。また、外観の評価結果は○であった。
2 樹脂層(A)
3 樹脂層(B2)
10 液晶セル
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 (19)
- 樹脂層(A)と樹脂層(B1)とをこの順に有し、
該樹脂層(A)は(メタ)アクリル系樹脂を主成分として含む樹脂層であって紫外線吸収剤を該樹脂層(A)中の樹脂成分に対して0.5〜10重量%の割合で含み、
該樹脂層(B1)は(メタ)アクリル系樹脂以外の熱可塑性樹脂を主成分として含む樹脂層である、
偏光子保護フィルム。 - 前記樹脂層(B1)は、紫外線吸収剤を該樹脂層(B1)中の樹脂成分に対して0重量%を超えて2重量%以下の割合で含む、請求項1に記載の偏光子保護フィルム。
- 前記樹脂層(B1)中の紫外線吸収剤の含有割合が、前記樹脂層(A)中の紫外線吸収剤の含有割合よりも少ない、請求項1または2に記載の偏光子保護フィルム。
- 前記樹脂層(B1)の厚みが0.5〜15μm、前記樹脂層(A)の厚みが5〜70μm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(メタ)アクリル系樹脂以外の熱可塑性樹脂が、ポリアミド系樹脂、ポリカーボネート系樹脂、ポリスチレン系樹脂、ポリオレフィン系樹脂、ポリエステル系樹脂、ポリエーテル系樹脂、ポリフェニレン系樹脂から選ばれる少なくとも1種である、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。
- 前記樹脂層(A)の前記樹脂層(B1)の反対側に樹脂層(B2)を有し、該樹脂層(B2)は熱可塑性樹脂を主成分として含む樹脂層である、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。
- 前記樹脂層(B2)は(メタ)アクリル系樹脂以外の熱可塑性樹脂を主成分として含む樹脂層である、請求項6に記載の偏光子保護フィルム。
- 前記(メタ)アクリル系樹脂以外の熱可塑性樹脂が、ポリアミド系樹脂、ポリカーボネート系樹脂、ポリスチレン系樹脂、ポリオレフィン系樹脂、ポリエステル系樹脂、ポリエーテル系樹脂、ポリフェニレン系樹脂から選ばれる少なくとも1種である、請求項7に記載の偏光子保護フィルム。
- 前記樹脂層(B2)は、紫外線吸収剤を該樹脂層(B2)中の樹脂成分に対して0重量%を超えて2重量%以下の割合で含む、請求項6から8までのいずれかに記載の偏光子保護フィルム。
- 前記樹脂層(B1)中の紫外線吸収剤の含有割合および前記樹脂層(B2)中の紫外線吸収剤の含有割合が、いずれも、前記樹脂層(A)中の紫外線吸収剤の含有割合よりも少ない、請求項6から9までのいずれかに記載の偏光子保護フィルム。
- 前記樹脂層(B1)の厚みが0.5〜15μm、前記樹脂層(A)の厚みが5〜70μm、前記樹脂層(B2)の厚みが0.5〜15μmである、請求項6から10までのいずれかに記載の偏光子保護フィルム。
- 総厚みが15〜100μmである、請求項1から11までのいずれかに記載の偏光子保護フィルム。
- 厚み50μmにおける380nmの光線透過率が10%以下である、請求項1から12までのいずれかに記載の偏光子保護フィルム。
- 共押出し成形されて作製される、請求項1から13までのいずれかに記載の偏光子保護フィルム。
- ポリビニルアルコール系樹脂から形成される偏光子と請求項1から14までのいずれかに記載の偏光子保護フィルムとを含む、偏光板。
- 前記偏光子保護フィルムと前記偏光子との間に接着剤層を有する、請求項15に記載の偏光板。
- 前記接着剤層が、ポリビニルアルコール系接着剤から形成される層である、請求項16に記載の偏光板。
- 樹脂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15から17までのいずれかに記載の偏光板。
- 請求項15から18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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KR101657355B1 (ko) | 2013-09-25 | 2016-09-20 | 주식회사 엘지화학 | 아크릴계 수지 조성물, 이를 포함하는 수지 펠렛 및 광학필름 |
KR20150108263A (ko) * | 2014-03-17 | 2015-09-25 | 주식회사 엘지화학 | 위상차 필름, 이를 포함하는 편광판 및 디스플레이 장치 |
KR101705942B1 (ko) * | 2014-03-17 | 2017-02-10 | 주식회사 엘지화학 | 위상차 필름, 이를 포함하는 편광판 및 디스플레이 장치 |
WO2017002904A1 (ja) * | 2015-06-30 | 2017-01-05 | 三菱樹脂株式会社 | 積層光学フィルム、及び偏光板 |
JP2017165086A (ja) * | 2015-06-30 | 2017-09-21 | 三菱ケミカル株式会社 | 積層光学フィルム、及び偏光板 |
JP2019077855A (ja) * | 2017-10-24 | 2019-05-23 | 株式会社日本触媒 | (メタ)アクリル系樹脂組成物、ならびにそれを用いた成形品およびフィルム |
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CN101568860B (zh) | 2011-11-09 |
JP4999095B2 (ja) | 2012-08-15 |
TWI371601B (ja) | 2012-09-01 |
US20100033810A1 (en) | 2010-02-11 |
CN101568860A (zh) | 2009-10-28 |
WO2008078521A1 (ja) | 2008-07-03 |
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