JP6027850B2 - 偏光板の製造方法 - Google Patents
偏光板の製造方法 Download PDFInfo
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- JP6027850B2 JP6027850B2 JP2012236864A JP2012236864A JP6027850B2 JP 6027850 B2 JP6027850 B2 JP 6027850B2 JP 2012236864 A JP2012236864 A JP 2012236864A JP 2012236864 A JP2012236864 A JP 2012236864A JP 6027850 B2 JP6027850 B2 JP 6027850B2
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- transparent protective
- film
- polarizer
- protective film
- polarizing plate
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Description
前記第1透明保護フィルムおよび第2透明保護フィルムは、弾性率(MPa)×厚み(μm)の値で定義される弾性が異なり、高い弾性を有する方を高弾性フィルム、低い弾性を有する方を低弾性フィルムと定義し、
かつ、前記一対の各ロールの各中心点と前記一対のロール間で前記3枚のフィルム(前記偏光子、第1透明保護フィルムおよび第2透明保護フィルム)が貼り合わされる接点を結ぶ線を第1仮想線とし、当該第1仮想線に対して直交する方向の線を第2仮想線と定義する場合に、
前記3枚のフィルムは、一対のロール間を同時に通過することにより圧着し、
かつ、前記偏光子を前記一対のロール間に投入して通過させる搬送方向が、前記第2仮想線よりも、高弾性フィルムの側に傾いていることを特徴とする偏光板の製造方法、に関する。
弾性率(グラフの傾き)を求める際の横軸: 歪(ひずみ)(%)
弾性率(グラフの傾き)を求める際の縦軸: 引張応力σ(MPa=N/mm2)=F/試験片の初期断面積A(mm2)
弾性率(グラフの傾き)を求める際の範囲: 歪0.05〜0.25%間の線形回帰
試験片形状:帯状(測定間距離100mm,幅50mm)
チャック間距離:100mm
得られた偏光子から、180mm×500mmのサンプルを切り出し、その初期重量(W(g))を測定した。そのサンプルを120℃の乾燥機内で2時間放置した後、乾燥後重量(D(g))を測定した。これらの測定値より、下記式により水分率を求めた。
水分率(%)={(W−D)/W}×100
厚さ75μmのポリビニルアルコールフィルム((株)クラレ製:VF−PS7500,幅1000mm)を用いて、30℃の純水中に60秒間浸漬しながら延伸倍率2.5倍まで延伸し、30℃のヨウ素水溶液(重量比:純水/ヨウ素(I)/ヨウ化カリウム(KI)=100/0.01/1)中で45秒間染色し、4重量%ホウ酸水溶液中で延伸倍率が5.8倍になるように延伸し、純水中に10秒間浸漬した後、フィルムの張力を保ったまま60℃で5分間乾燥して偏光子を得た。この偏光子の厚さは25μm、水分率は15重量%であった。
PVA樹脂(日本合成化学工業(株)製:ゴセノール)100重量部と架橋剤(大日本インキ化学工業(株)製:ウォーターゾール)35重量部を純水3760重量部中に溶解して接着剤を調製した。この接着剤を、厚さ60μmのトリアセチルセルロース(TAC)フィルム(富士フィルム社製:TD60UL,弾性率4000MPa)の片面側にスロットダイにて塗布後、85℃で1分間乾燥して、厚さ0.1μmの接着層を有する、接着層付のTACフィルムを得た。
(偏光板の作製)
図1に示す方法にて、偏光板を作製した。偏光子Aには上記偏光子を用い、第1透明保護フィルムB1には上記接着層付のTACフィルムを用いた。第2透明保護フィルムB2には、接着層付のアクリルフィルムを用いた。接着層付のアクリルフィルムは、TACフィルムの代わりに、厚さ40μmのアクリルフィルム(弾性率2000MPa)を用いたこと以外は、上記接着層付のTACフィルムと同様にして作製した。図1に示すように、接着層付のTACフィルム(第1透明保護フィルムB1)は、第1ロールR1の側から、接着層付のアクリルフィルム(第2透明保護フィルムB2)は、第2ロールR2の側から搬送した。第1ロールR1、第2ロールR2として、直径200mmの鉄ロールを用いた。
偏光子の搬送方向と中央線(第2仮想線s2)なす傾斜角θは、中央線(第2仮想線s2)を0°として、高弾性フィルム側に傾斜した場合をプラス側、低弾性フィルム側をマイナス側とした。傾斜角θは、ラミネート部(接点p1)の上部60cm位置に可動式のロールを取り付けて、当該ロールを左右に動かすことで調整した。
実施例1において、第1透明保護フィルム、第2透明保護フィルムの種類、偏光子の傾斜角θを表1に示すように変えたこと以外は実施例1と同様にして、偏光板を得た。
得られた偏光板から1000mm×1000mmのサンプルを切り出し、偏光子とTACフィルムの間の気泡の数を確認した。
偏光板を製造する際の搬送性を下記基準で評価した。
○:搬送中にロール上でシワ等が入らない場合。
×:搬送中にロール上でシワが入った場合。
アクリル:厚さ40μmのアクリルフィルム(弾性率2000MPa);
COP:厚さ50μmの環状ポリオレフィンフィルム(日本ゼオン社製:ZEONOR,弾性率1800MPa)、を示す。但し、実施例5では厚さ40μmのTACを用いた。
B1 第1透明保護フィルム(低弾性フィルム)
B2 第2透明保護フィルム(高弾性フィルム)
R1 第1ロール
R2 第2ロール
M 角度変更手段
Claims (2)
- 一対のロール間で、偏光子の両面に、第1透明保護フィルムおよび第2透明保護フィルムを接着層を介して、貼り合わせる偏光板の製造方法において、
前記第1透明保護フィルムおよび第2透明保護フィルムは、弾性率(MPa)×厚み(μm)の値で定義される弾性が異なり、高い弾性を有する方を高弾性フィルム、低い弾性を有する方を低弾性フィルムと定義し、
かつ、前記一対の各ロールの各中心点と前記一対のロール間で前記3枚のフィルム(前記偏光子、第1透明保護フィルムおよび第2透明保護フィルム)が貼り合わされる接点を結ぶ線を第1仮想線とし、当該第1仮想線に対して直交する方向の線を第2仮想線と定義する場合に、
前記3枚のフィルムは、一対のロール間を同時に通過することにより圧着し、
かつ、前記偏光子を前記一対のロール間に投入して通過させる搬送方向が、前記第2仮想線よりも、高弾性フィルムの側に傾いていることを特徴とする偏光板の製造方法。
- 前記第2仮想線と、偏光子の搬送方向のなす角度が0°を超え1°以下の範囲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。
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DE102015118991A1 (de) | 2015-11-05 | 2017-05-11 | Ev Group E. Thallner Gmbh | Verfahren zur Behandlung von Millimeter- und/oder Mikrometer- und/oder Nanometerstrukturen an einer Oberfläche eines Substrats |
CN113524702B (zh) * | 2016-02-08 | 2023-06-20 | 住友化学株式会社 | 层叠光学膜的制造方法 |
JP6378731B2 (ja) * | 2016-02-08 | 2018-08-22 | 住友化学株式会社 | 積層光学フィルムの製造方法 |
KR101734776B1 (ko) | 2016-06-22 | 2017-05-11 | 주식회사 엘지화학 | 광학필름 제조방법 및 광학필름 |
JP7403209B2 (ja) * | 2016-07-28 | 2023-12-22 | 住友化学株式会社 | 偏光板 |
JP6343057B1 (ja) * | 2017-03-31 | 2018-06-13 | 住友化学株式会社 | プロテクトフィルム付偏光板及び光学積層体 |
WO2020203124A1 (ja) * | 2019-03-29 | 2020-10-08 | 日東電工株式会社 | ガラス樹脂積層体の製造方法 |
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JP2002365432A (ja) * | 2001-06-07 | 2002-12-18 | Nitto Denko Corp | 偏光板の製造方法及びそれを用いた表示装置 |
JP2003262725A (ja) * | 2002-03-08 | 2003-09-19 | Fuji Photo Film Co Ltd | 偏光板保護フイルム及び偏光板 |
JP2004077768A (ja) * | 2002-08-16 | 2004-03-11 | Fuji Photo Film Co Ltd | 偏光板及びその製造方法 |
JP3921155B2 (ja) * | 2002-09-24 | 2007-05-30 | 日東電工株式会社 | 偏光板の製造方法 |
US20090040434A1 (en) * | 2005-02-25 | 2009-02-12 | Nitto Denko Corporation | Method of producing elliptically polarizing plate and image display apparatus using the elliptically polarizing plate |
JP4553258B2 (ja) * | 2005-02-25 | 2010-09-29 | 日東電工株式会社 | 楕円偏光板の製造方法および楕円偏光板を用いた画像表示装置 |
JP2006341450A (ja) * | 2005-06-08 | 2006-12-21 | Fujifilm Holdings Corp | セルロースアシレートフィルムの製造方法、及びそれを用いて製造されたセルロースアシレートフィルム、並びに液晶表示板用光学補償フィルム |
JP4971022B2 (ja) | 2006-07-12 | 2012-07-11 | 日東電工株式会社 | 多層積層フィルムの製造方法 |
JP4335901B2 (ja) | 2006-11-14 | 2009-09-30 | 日東電工株式会社 | 偏光板の製造方法 |
JP4945283B2 (ja) * | 2007-03-28 | 2012-06-06 | 富士フイルム株式会社 | 熱可塑性樹脂フィルムの製造方法 |
JP5051916B2 (ja) | 2008-11-27 | 2012-10-17 | 日東電工株式会社 | ラミネートフィルムの製造方法 |
CN102639663B (zh) * | 2010-01-21 | 2015-04-01 | 日本合成化学工业株式会社 | 粘合剂 |
TW201213096A (en) * | 2010-09-20 | 2012-04-01 | Benq Materials Corp | Film processing equipment and method of applying the same |
JP2012179893A (ja) * | 2011-02-08 | 2012-09-20 | Nitto Denko Corp | 多層積層フィルムの製造方法 |
JP2012173544A (ja) * | 2011-02-22 | 2012-09-10 | Nitto Denko Corp | 偏光子の製造方法 |
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CN103792610A (zh) | 2014-05-14 |
US9034138B2 (en) | 2015-05-19 |
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KR102092974B1 (ko) | 2020-03-24 |
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