JP4618716B2 - 液晶化合物 - Google Patents
液晶化合物 Download PDFInfo
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- JP4618716B2 JP4618716B2 JP2005031781A JP2005031781A JP4618716B2 JP 4618716 B2 JP4618716 B2 JP 4618716B2 JP 2005031781 A JP2005031781 A JP 2005031781A JP 2005031781 A JP2005031781 A JP 2005031781A JP 4618716 B2 JP4618716 B2 JP 4618716B2
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- Prior art keywords
- liquid crystal
- crystal compound
- film
- group
- polarizing plate
- Prior art date
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- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical group C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 claims description 8
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- 125000000113 cyclohexyl group Chemical group [H]C1([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])C1([H])[H] 0.000 claims description 3
- 125000001624 naphthyl group Chemical group 0.000 claims description 3
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- FPQQSJJWHUJYPU-UHFFFAOYSA-N 3-(dimethylamino)propyliminomethylidene-ethylazanium;chloride Chemical compound Cl.CCN=C=NCCCN(C)C FPQQSJJWHUJYPU-UHFFFAOYSA-N 0.000 description 3
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- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
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Images
Landscapes
- Liquid Crystal (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Liquid Crystal Substances (AREA)
- Polarising Elements (AREA)
Description
(Z−X5)nCh ・・・(20)
(Z−X2−Sp−X5)nCh ・・・(21)
(P1−X5)nCh ・・・(22)
(Z−X2−Sp−X3−M−X4)nCh ・・・(23)
p−ヒドロキシ安息香酸エチル(22.94g、138mmol)と炭酸カリウム(31.48g、228mmol)のジメチルホルムアミド(200ml)懸濁液に、クロロエトキシテトラヒドロピラニルエーテル(25g、152mmol)を窒素雰囲気下で滴下した。温度140℃で溶液を激しく4時間加熱撹拌させ、生成した塩をろ過し、ろ液に水を加え、酢酸エチルで抽出した。無水硫酸マグネシウムで乾燥させた後、減圧下で溶媒を留去し、テトラヒドロピラニルオキシエトキシ安息香酸エチルエステルの粗生成物を得た。この粗生成物を、エタノール(100ml)、水(50ml)に希釈し、水酸化ナトリウム(8.28g、207mmol)を加え、室温にて3時間撹拌した。この溶液に塩化アンモニウム飽和水溶液を加えて析出する沈殿をろ別し、これを酢酸エチルによって再結晶することで、テトラヒドロピラニルオキシエトキシ安息香酸(27.9g、105mmol、76%)を得た。
テトラヒドロピラニルオキシエトキシ安息香酸(2.57g、9.7mmol)、シアノヒドロキシビフェニル(1.84g、9.6mmol)、ジメチルアミノピリジン(0.28g、1.0mmol)の塩化メチレン(20ml)懸濁液に、エチルジメチルアミノプロピルカルボジイミド塩酸塩(2.22g、11.6mmol)を加え、室温で4時間撹拌した。この溶液に塩化メチレンを加え、飽和炭酸水素ナトリウム水溶液および飽和塩化ナトリウム水溶液で洗浄し、無水硫酸マグネシウムにて乾燥した後、溶媒を減圧下で留去し、テトラヒドロピラニルオキシエトキシ安息香酸シアノビフェニルエステルの粗生成物を得た。この粗生成物に、ジエチルエーテル(30ml)とメタノール(10ml)を加え、p−トルエンスルホン酸を少量添加した。このまま室温で3時間撹拌し、生じてくる沈殿をろ別、アセトン/ヘキサン混合溶媒で再結晶することにより、ヒドロキシエトキシ安息香酸シアノビフェニルエステル(2.53g、7.0mmol、73%)を得た。
2,4,6−トリカルボキシヘプタン(0.43g、1.9mmol)、ヒドロキシエトキシ安息香酸シアノビフェニルエステル(2.00g、5.6mmol)、ジメチルフェニルジフェニルホスフィン(1.76g、5.8mmol)のジオキサン(10ml)溶液に、テトラメチルアゾジカルボキシレート(0.99g、5.8mmol)のジオキサン(2ml)溶液をゆっくり滴下した。室温にて10時間撹拌した後、塩化メチレンを加え、2mol/l塩酸水溶液、飽和塩化ナトリウム水溶液で洗浄し、無水硫酸マグネシウムにて乾燥した後、溶媒を減圧下で留去し、さらにシリカゲルカラムクロマトグラフィー処理(展開溶液:塩化メチレン/酢酸エチル=30/1)によって精製することで、前述の液晶化合物(A)を得た。
得られた液晶化合物(A)の液晶温度範囲を、毎分10℃の昇温状態において測定した結果、この液晶化合物(A)は、64℃で結晶状態からネマチック液晶相へ相転移し、220℃にて等方相液体状態に相転移した。降温過程においては、ネマチック液晶相のままガラス化し、0℃においても結晶化することはなかった。
シアノヒドロキシビフェニル(30.0g、154mmol)と炭酸カリウム(42.5g、307mmol)のN−メチルピロリドン(200ml)懸濁液にクロロエタノール(12.4ml、184mmol)を窒素雰囲気で滴下した。温度140℃で溶液を激しく4時間加熱撹拌させ、生成した塩をろ過し、ろ液に水を加え、酢酸エチルで抽出した。硫酸マグネシウムで乾燥させた後、減圧下で溶媒を留去し、アセトンとヘキサンの混合溶媒によって再結晶することで、シアノビフェニルオキシエタノール(28.8g、121mmol、78%)を得た。
シアノビフェニルオキシエタノール(5.0g、20mmol)、シアノ酢酸(2.7g、31mmol)、ジメチルアミノピリジン(0.28g、1.0mmol)の塩化メチレン(40ml)懸濁液にエチルジメチルアミノプロピルカルボジイミド塩酸塩(6.0g、31mmol)を加え、室温で4時間撹拌した。この溶液に塩酸水およびメタノールを加え、析出する白色固体をろ別することにより、シアノ酢酸(シアノビフェニルオキシエチル)エステル(6.3g、21mmol、98%)を得た。
シアノビフェニルオキシエタノール(10g、42mmol)、メタクリル酸(5.4g、63mmol)、ジメチルアミノピリジン(0.5g、2mmol)の塩化メチレン(100ml)懸濁液にエチルジメチルアミノプロピルカルボジイミド塩酸塩(12.0g、63mmol)を加え、室温で10時間撹拌した。この溶液に塩酸水およびメタノールを加え、析出する白色固体をろ別することにより、メタクリル酸(シアノビフェニルオキシエチル)エステル(4.6g、15mmol、36%)を得た。
シアノ酢酸(シアノビフェニルオキシエチル)エステル(1.13g、3.3mmol)、メタクリル酸(シアノビフェニルオキシエチル)エステル(2.00g、6.5mmol)にジアザビシクロウンデセン(2ml)を加え、100℃で5時間加熱撹拌した後、塩化メチレンを加え、塩酸水溶液、飽和塩化ナトリウム水溶液で洗浄し、無水硫酸マグネシウムにて乾燥した後、溶媒を減圧下で留去し、さらにシリカゲルカラムクロマトグラフィー処理(展開溶液:塩化メチレン/酢酸エチル=50/1)によって精製することで、下記式で示されるように、液晶化合物(B)を得た。
実施例1において、2,4,6−トリカルボキシヘプタンの代わりにコハク酸を用いた以外は、実施例1と同様に行い、下記式で表される液晶化合物(C)を得た。
得られた液晶化合物(A)、(B)、(C)100部、シクロヘキサノン300部からなる溶液を、ポリビニルアルコール配向膜が形成されているガラス板にスピンコート塗布した後、溶媒の揮発および液晶配向をさせるために、150℃で60秒間加熱処理すると、液晶化合物がネマチック配向状態を形成した1軸配向光学素子となった。
液晶化合物(A)、(B)からなる1軸配向光学素子は、この状態から室温に放冷処置を施すことにより、ガラス固定されて1軸配向状態を維持したが、液晶化合物(C)からなる1軸配向光学素子は、結晶化してしまい、モノドメインな1軸配向光学素子を得るに至らなかった。
得られた液晶化合物(A)、(B)、(C)100部、カイラル添加剤(LC756、BASF社製)6部、シクロヘキサノン300部からなる溶液を、ポリビニルアルコール配向膜が形成されているガラス板にスピンコート塗布した後、溶媒の揮発および液晶配向をさせるために、140℃で60秒間加熱処理し、室温まで放冷すると、液晶化合物がコレステリック配向状態で固定化された光学素子となった。
液晶化合物(A)、(B)から得られた配向フィルムは、中心波長550nmの選択反射挙動を示したが、液晶化合物(C)から得られた配向フィルムは、結晶化のために選択反射挙動は見られなかった。
液晶化合物(A)100部、シクロペンタノン250部に対して、カイラル添加剤(LC756、BASF社製)の配合部数を6.5部、6.0部、5.7部、5.5部と4種類変化させて得たコレステリック液晶配向固定化フィルムは、それぞれ、λ=420nm、540nm、650nm、720nmの選択反射中心波長を有していた。
これらの4枚の液晶配向フィルムを粘着剤で貼り合わせて、420nmから720nmまでの広帯域選択反射フィルムを得た。
広帯域選択反射フィルムに位相差135nmの位相差フィルムをアクリル系粘着剤(厚み20μm)で貼り合わせてコレステリック偏光子を作製した。これを液晶ディスプレイ用バックライト(ドット印刷型バックライト)の上に設置し、その上に偏光軸を平行にした偏光板を設置して(構成:偏光子/位相差135nmの位相差フィルム/コレステリック液晶配向固定化フィルム/バックライト/偏光板)、輝度計(ミノルタ製、BM−7)で測定したところ、バックライト上に偏光板のみを設置した場合(構成:偏光子/バックライト/偏光板)に比べて、輝度が1.4倍になった。
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 偏光フィルム
32 接着剤層
33 透明性保護フィルム
34 接着剤層
35 第2の透明性保護フィルム
40 導光板
50 光源
60 リフレクター
100 液晶表示装置
Claims (7)
- 一般式(1)で表される液晶化合物であって、
- 一般式(1)におけるXがHまたはCNである、請求項1に記載の液晶化合物。
- 一般式(1)におけるYが−O−である、請求項1または2に記載の液晶化合物。
- 請求項1から3までのいずれかに記載の液晶化合物を含む液晶組成物を配向規制力を有する基板上に塗布し、加熱配向処理した後に室温まで冷却する、光学素子の製造方法。
- 請求項4に記載の製造方法によって得られる、光学素子。
- 請求項5に記載の光学素子を含む、偏光板。
- 請求項6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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