JP2022039804A - 配向液晶フィルムの製造方法 - Google Patents
配向液晶フィルムの製造方法 Download PDFInfo
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- JP2022039804A JP2022039804A JP2020145000A JP2020145000A JP2022039804A JP 2022039804 A JP2022039804 A JP 2022039804A JP 2020145000 A JP2020145000 A JP 2020145000A JP 2020145000 A JP2020145000 A JP 2020145000A JP 2022039804 A JP2022039804 A JP 2022039804A
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- 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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- 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
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
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Abstract
Description
液晶化合物としては、棒状液晶化合物および円盤状液晶化合物等が挙げられる。支持基板の配向規制力によりホモジニアス配向しやすいことから、液晶化合物としては棒状液晶化合物が好ましい。棒状液晶化合物は、主鎖型液晶でも側鎖型液晶でもよい。棒状液晶化合物は、液晶ポリマーでもよく、重合性液晶化合物の重合物でもよい。重合前の液晶化合物(モノマー)が液晶性を示すものであれば、重合後は液晶性を示さないものであってもよい。
液晶性組成物を塗布する支持基板8としては、ガラス板、金属板、金属ベルト、樹脂フィルム基板等が挙げられる。支持基板は第一主面および第二主面を有し、第一主面上に液晶性組成物を塗布する。
液晶化合物がサーモトロピック液晶である場合は、支持基板8の第一主面上に液晶性組成物を塗布し、加熱により液晶化合物を液晶状態として配向させる。
上記の通り、光硬化後の液晶層は、加熱しても相転移を生じないため、未硬化の配向液晶層に比べると熱安定性に優れている。しかし、光硬化後の液晶層を高温環境に長時間暴露すると、光学特性が変化する場合があり、加熱耐久性向上の余地がある。特に、配向液晶層に接着剤を介して他の光学層を貼り合わせた配向液晶フィルムは、長時間の加熱により、レターデーションが上昇する傾向があり、加熱耐久性に課題がある。
配向液晶フィルムは、図1に示す形態に限定されない。例えば、図2に示す様に、配向液晶フィルム102は、配向液晶層1の支持基板8と接していない面に、適宜の接着剤層3または粘着剤層を介して、他の光学層4が積層されたものであってもよい。
配向液晶フィルムは、視認性向上等を目的としたディスプレイ用光学フィルムとして用いることができる。例えば、液晶表示装置では、液晶セルから視認側に射出される光の偏光状態を適宜に変換して、視野角特性を向上させる等の目的で、画像表示セル(液晶セル)と偏光子との間に光学補償フィルムとしての位相差板が配置される場合がある。
図6は画像表示装置の積層構成例を示す断面図であり、画像表示セル50の表面に、粘着剤層2を介して配向液晶層1を備える配向液晶フィルムが貼り合わせられている。配向液晶フィルムは、2層以上の配向液晶層を備えるものであってもよい。画像表示セル50としては、液晶セルや有機ELセル等が挙げられる。
<比較例1>
ネマチック液晶相を示す光重合性液晶化合物(BASF製「Paliocolor LC242」)をシクロペンタノンに溶解して、固形分濃度30重量%の溶液を調製した。この溶液に、界面活性剤(ビック・ケミー製「BYK-360」)および光重合開始剤(IGM Resins製「Omnirad907」)を添加して、液晶性組成物溶液を調製した。レベリング剤および重合開始剤の添加量は、光重合性液晶化合物100重量部に対して、それぞれ、0.01重量部および3重量部とした。
比較例1の積層体の配向液晶層の表面に、ワイヤーバー(#10)でシクロペンタノンを塗布した後、110℃で1分間加熱して溶媒を除去した。
溶媒除去時の加熱温度を表1に示す様に変更したこと以外は実施例1と同様にしてシクロペンタノンによる処理を実施した。
表面処理液として、アクリル樹脂(楠本化成製、メタクリル酸メチルとメタクリル酸ブチルの共重合体、重量平均分子量20万)のシクロペンタノン溶液(樹脂含有量3重量%)を準備した。比較例1の積層体の配向液晶層の表面に、ワイヤーバー(#10)でこの表面処理液を塗布した後、85℃で加熱して溶媒を除去した。
厚み20μmの無延伸ノルボルネン系フィルム(日本ゼオン製「ゼオノアフィルム」)の片面に、UV硬化型接着剤を介して厚み5μmのPVA系偏光子が設けられた積層体(片保護偏光板)を準備した。
上記の偏光板の粘着剤層をガラス板に貼り合わせて評価用試料を作製した。位相差計(王子計測機器製「KOBRA21-ADH」)により波長590nmの面内レターデーションを測定した後、評価用試料を85℃の空気循環式恒温オーブンに120時間投入した。オーブンから試料を取り出した後、再度面内レターデーションを測定し、加熱試験前後のレターデーションの変化率を算出した。
8 支持基板
4 光学層(偏光板)
5 光学層(配向液晶層)
3,7 接着剤層
2 粘着剤層
9 セパレーター
50 画像表示セル
Claims (9)
- 液晶分子が配向した配向液晶層を備える配向液晶フィルムの製造方法であって、
配向液晶層の表面に有機溶媒を接触させる表面処理を実施する、配向液晶フィルムの製造方法。 - 前記表面処理後に、40~150℃で加熱を行い、前記配向液晶層の表面から前記有機溶媒を除去する、請求項1に記載の配向液晶フィルムの製造方法。
- さらに、前記表面処理後の配向液晶層と光学層とを、接着剤を介して貼り合わせる工程を有する、請求項1または2に記載の配向液晶フィルムの製造方法。
- 前記光学層が、偏光子、透明フィルム、または他の配向液晶層である、請求項3に記載の配向液晶フィルムの製造方法。
- 前記接着剤が、活性エネルギー線硬化型の接着剤である、請求項3または4に記載の配向液晶フィルムの製造方法。
- 前記配向液晶層において、液晶分子がホモジニアス配向している、請求項1~5のいずれか1項に記載の配向液晶フィルムの製造方法。
- 光重合性液晶モノマーを含有する液晶性組成物を支持基板上に塗布する塗布工程;
前記支持基板上の液晶性組成物を加熱して、液晶モノマーを液晶状態として配向させる、配向工程;および
光照射により前記液晶モノマーを重合または架橋する光硬化工程を有し、
前記光硬化工程後に、前記表面処理を実施する、請求項1~6のいずれか1項に記載の配向液晶フィルムの製造方法。 - 前記支持基板が樹脂フィルムである、請求項7に記載の配向液晶フィルムの製造方法。
- 前記表面処理に用いられる有機溶媒は、前記光重合性液晶モノマーに対する溶解性を有し、かつ前記光重合性液晶モノマーの光硬化物を不溶または難溶である、請求項7または8に記載の配向液晶フィルムの製造方法。
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JPH11264907A (ja) * | 1998-01-10 | 1999-09-28 | Lg Cable & Mach Co Ltd | 積層方法を用いた広帯域偏光膜の製造方法及びこれを用いた液晶表示素子 |
JP2001141928A (ja) * | 1999-11-15 | 2001-05-25 | Fuji Photo Film Co Ltd | π/2旋光子、それを利用した偏光変換素子、および液晶プロジェクター用投光装置 |
JP2003131031A (ja) * | 2001-10-23 | 2003-05-08 | Dainippon Printing Co Ltd | 光学素子の製造方法および光学素子 |
JP2008191630A (ja) * | 2007-01-09 | 2008-08-21 | Nippon Oil Corp | 楕円偏光板、その製造方法、輝度向上フィルムおよび画像表示装置 |
JP2015111293A (ja) * | 2010-07-20 | 2015-06-18 | 富士フイルム株式会社 | 光学フィルム、位相差フィルム、偏光板及び画像表示装置 |
JP2020118730A (ja) * | 2019-01-18 | 2020-08-06 | 日東電工株式会社 | 配向液晶フィルムおよびその製造方法、ならびに画像表示装置 |
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