JPWO2018047872A1 - 液晶配向剤、液晶配向膜及び液晶表示素子 - Google Patents
液晶配向剤、液晶配向膜及び液晶表示素子 Download PDFInfo
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- JPWO2018047872A1 JPWO2018047872A1 JP2018538446A JP2018538446A JPWO2018047872A1 JP WO2018047872 A1 JPWO2018047872 A1 JP WO2018047872A1 JP 2018538446 A JP2018538446 A JP 2018538446A JP 2018538446 A JP2018538446 A JP 2018538446A JP WO2018047872 A1 JPWO2018047872 A1 JP WO2018047872A1
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- diamine
- crystal alignment
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 179
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 70
- 150000004985 diamines Chemical class 0.000 claims abstract description 55
- 229920005575 poly(amic acid) Polymers 0.000 claims abstract description 44
- 229920001721 polyimide Polymers 0.000 claims abstract description 41
- 239000004642 Polyimide Substances 0.000 claims abstract description 38
- 229920000642 polymer Polymers 0.000 claims abstract description 33
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims abstract description 14
- 125000006615 aromatic heterocyclic group Chemical group 0.000 claims abstract description 13
- 125000000467 secondary amino group Chemical group [H]N([*:1])[*:2] 0.000 claims abstract description 13
- -1 tetracarboxylic acid dianhydride Chemical class 0.000 claims abstract description 13
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- 125000004432 carbon atom Chemical group C* 0.000 claims description 24
- 125000001183 hydrocarbyl group Chemical group 0.000 claims description 23
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 19
- 125000000962 organic group Chemical group 0.000 claims description 15
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical group C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 claims description 14
- 125000002029 aromatic hydrocarbon group Chemical group 0.000 claims description 13
- 125000000217 alkyl group Chemical group 0.000 claims description 12
- 125000004429 atom Chemical group 0.000 claims description 10
- 125000000623 heterocyclic group Chemical group 0.000 claims description 9
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Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
- C09K19/54—Additives having no specific mesophase characterised by their chemical composition
- C09K19/56—Aligning agents
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
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Abstract
Description
(A)成分:下記式(1−1)及び下記式(1−2)から選ばれる少なくとも1種の構造を有するジアミン
(B)成分:下記式(2)の構造を有するジアミン
(C)成分:下記式(a)及び下記式(b)から選ばれる少なくとも1種の構造を有するジアミン
本発明の液晶配向膜は、芳香族複素環と、1級アミノ基及び2級アミノ基を構造中に有する重合体を含有する。
本発明の液晶配向膜中の重合体に含有される、上記芳香族複素環の例を挙げると、ピロール環、フラン環、チオフェン環、イミダゾール環、ピラゾール環、オキサゾール環、イソオキサゾール環、チアゾール環、イソチアゾール環等の五員環芳香族複素環;ピリジン環、ピリミジン環、ピリダジン環、ピラジン環、トリアジン環等の六員環芳香族複素環;キノリン、イソキノリン、クマリン、インドール、ベンズイミダゾール、ベンゾフラン等の多環芳香族ヘテロ環化合物が挙げられる。
本発明の液晶配向剤及びそれを用いて得られる液晶配向膜に含有される重合体は、芳香族複素環及び1級アミノ基及び2級アミノ基を構造中に有していれば特に限定はされないが、得られる液晶表示素子の特性及び信頼性の観点から、ジアミン成分とテトラカルボン誘導体成分との反応物であるポリイミド前駆体及びそのイミド化物であるポリイミドから選ばれる少なくとも1種の重合体であることが好ましい。
本発明の液晶配向剤及びそれを用いて得られる液晶配向膜に含有される重合体としては、ポリイミド前駆体及びそのイミド化物であるポリイミドから選ばれる少なくとも1種の重合体であることが好ましいが、その製造に用いられるジアミン成分中には、芳香族複素環を生じる構造を有するジアミン(以下、特定ジアミン1とも言う)及び芳香族複素環を構造中に有するジアミン(以下、特定ジアミン2とも言う)からなる群から選ばれる少なくとも1種のジアミン、及び、1級アミノ基又は2級アミノ基を生じる構造を有するジアミン(以下、特定ジアミン3とも言う)が用いられる。
特定ジアミン1は、以下の式(1−1)、式(1−2)から選ばれる構造を有する。
特定ジアミン2は、以下の式(2)の構造を有する。
特定ジアミン3は、1級アミノ基又は2級アミノ基を生じる構造を有するジアミンであり、熱脱離基によって保護されたアミノ基の構造を構造中に有する。そのような構造は特に限定されないが、熱脱離のしやすさ等の観点から、以下の構造から選ばれる少なくとも1種の構造を含有することが好ましい。
本発明の液晶配向膜を得る為の液晶配向剤の製造には、1級アミノ基又は2級アミノ基を生じる構造を有するジアミン、即ち、熱脱離基によって保護されたアミノ基の構造を構造中に有するジアミンが用いられるが、保護されておらず、かつ重合に関与しないアミノ基を有するジアミンを用いても構わない。そのようなジアミンは、以下に例示される。
本発明の液晶配向剤に含有される重合体として好ましく用いられるポリイミド前駆体を製造するにあたっては、本発明の効果を奏する限度において、特定ジアミン以外のジアミン(以下、その他のジアミンとも言う)を含有しても良い。そのようなジアミンは、以下の一般式(3)で表される。
本発明の液晶配向剤に含有される重合体として好ましく用いられるポリイミド前駆体を製造するにあたって用いられるテトラカルボン酸二無水物は、下記式(4)で表される。
本発明の液晶配向剤は、前記したポリイミド前駆体またはそのイミド化重合体(以下、特定構造の重合体とする)が有機溶媒中に溶解された溶液の形態を有する。特定構造の重合体の分子量は、重量平均分子量で2,000〜500,000が好ましく、より好ましくは5,000〜300,000であり、さらに好ましくは、8,000〜100,000である。また、数平均分子量は、好ましくは、1,000〜250,000であり、より好ましくは、2,500〜150,000であり、さらに好ましくは、4,000〜50,000である。
本発明の液晶表示素子は、上記した手法により本発明の液晶配向剤から液晶配向膜付き基板を得、ラビング処理などにより配向処理を行った後、既知の方法により、液晶表示素子としたものである。
NMP:N−メチル−2−ピロリドン
GBL:γ−ブチロラクトン
BCS:ブチルセロソルブ
DA−1:下記構造式(DA−1)
DA−2:下記構造式(DA−2)
DA−3:下記構造式(DA−3)
DA−4:下記構造式(DA−4)
DA−5:下記構造式(DA−5)
DA−6:下記構造式(DA−6)
DA−7:下記構造式(DA−7)
DA−8:下記構造式(DA−8)
DA−9:下記構造式(DA−9)
DA−10:下記構造式(DA−10)
CA−1:下記構造式(CA−1)
CA−2:下記構造式(CA−2)
CA−3:下記構造式(CA−3)
CA−4:下記構造式(CA−4)
合成例において、重合体溶液の粘度は、E型粘度計TVE−22H(東機産業社製)を用い、サンプル量1.1mL、コーンロータTE−1(1°34’、R24)、温度25℃で測定した。
合成例におけるポリイミドのイミド化率は次のようにして測定した。ポリイミド粉末30mgをNMR(核磁気共鳴)サンプル管(NMRサンプリングチューブスタンダード,φ5(草野科学社製))に入れ、重水素化ジメチルスルホキシド(DMSO−d6,0.05質量%TMS(テトラメチルシラン)混合品)(0.53ml)を添加し、超音波をかけて完全に溶解させた。この溶液をNMR測定機(JNW−ECA500)(日本電子データム社製)にて500MHzのプロトンNMRを測定した。イミド化率は、イミド化前後で変化しない構造に由来するプロトンを基準プロトンとして決め、このプロトンのピーク積算値と、9.5ppm〜10.0ppm付近に現れるアミド酸のNH基に由来するプロトンピーク積算値とを用い以下の式によって求めた。
上記式において、xはアミド酸のNH基由来のプロトンピーク積算値、yは基準プロトンのピーク積算値、αはポリアミド酸(イミド化率が0%)の場合におけるアミド酸のNH基プロトン1個に対する基準プロトンの個数割合である。
撹拌装置及び窒素導入管付きの1Lの四つ口フラスコに、DA−1を86.0g(352mmol)、DA−2を53.4g(95.9mmol)、DA−3を76.5g(191mmol)量り取り、NMPを1580g加え、窒素を送りながら撹拌して溶解させた。このジアミン溶液を水冷下で撹拌しながら、CA−1を93.2g(416mmol)添加し、さらにNMPを168g加え、窒素雰囲気下40℃で3時間撹拌した。さらに、CA−2を28.2g(143mmol)添加し、さらにNMPを160g加え、窒素雰囲気下23℃で4時間撹拌し、ポリアミック酸の溶液(PAA−1)を得た。このポリアミック酸の溶液の温度25℃における粘度は200mPa・sであった。
撹拌子の入った3L三角フラスコに、実施例1で得られたポリアミック酸の溶液(PAA−1)を800g分取し、NMPを700g、無水酢酸を69.7g、ピリジンを18.0g加え、室温で30分間撹拌した後、55℃で3時間反応させた。この反応溶液を5600gのメタノール中に投入し、得られた沈殿物を濾別した。この沈殿物をメタノールで洗浄した後、温度60℃で減圧乾燥し、ポリイミドの粉末を得た。このポリイミドの粉末のイミド化率は、75%であった。
撹拌装置及び窒素導入管付きの200mLの四つ口フラスコに、DA−1を2.20g(9.00mmol)、DA−4を2.04g(5.97mmol)、DA−5を1.62g(15.0mmol)量り取り、NMPを59.3g加え、窒素を送りながら撹拌して溶解させた。このジアミン溶液を水冷下で撹拌しながら、CA−1を6.32g(28.1mmol)添加し、さらにNMPを30.0g加え、窒素雰囲気下40℃で3時間撹拌してポリアミック酸の溶液(PAA−2)を得た。このポリアミック酸の溶液の温度25℃における粘度は220mPa・sであった。
撹拌子の入った500mL三角フラスコに、合成例1で得られたポリアミック酸の溶液(PAA−2)を90.0g分取し、NMPを45.0g、無水酢酸を8.14g、ピリジンを2.10g加え、室温で30分間撹拌した後、55℃で3時間反応させた。この反応溶液を600gのメタノール中に投入し、得られた沈殿物を濾別した。この沈殿物をメタノールで洗浄した後、温度60℃で減圧乾燥し、ポリイミドの粉末を得た。このポリイミドの粉末のイミド化率は、67%であった。
撹拌装置及び窒素導入管付きの200mLの四つ口フラスコに、DA−5を0.540g(4.99mmol)、DA−6を2.12g(8.75mmol)、DA−7を0.826g(2.50mmol)、DA−8を3.80g(8.75mmol)量り取り、NMPを41.3g加え、窒素を送りながら撹拌して溶解させた。このジアミン溶液を水冷下で撹拌しながら、CA−3を3.12g(12.4mmol)添加し、さらにNMPを17.8g加え、窒素雰囲気下60℃で3時間撹拌した。さらに、CA−2を2.42g(12.3mmol)添加し、さらにNMPを14.1g加え、窒素雰囲気下40℃で4時間撹拌し、ポリアミック酸の溶液を得た。このポリアミック酸の溶液の温度25℃における粘度は115mPa・sであった。
撹拌装置及び窒素導入管付きの200mLの四つ口フラスコに、DA−3を3.18g(8.00mmol)、DA−9を2.38g(6.00mmol)、DA−10を1.79g(6.00mmol)量り取り、NMPを66.2g加え、窒素を送りながら撹拌して溶解させた。このジアミン溶液を水冷下で撹拌しながら、CA−4を4.25g(19.5mmol)添加し、さらにNMPを18.9g加え、窒素雰囲気下50℃で15時間撹拌し、ポリアミック酸の溶液を得た。このポリアミック酸の溶液の温度25℃における粘度は264mPa・sであった。
撹拌子を入れた50mL三角フラスコに、実施例1で得られたポリアミック酸の溶液(A−1)5.42g、合成例1で得られたポリアミック酸の溶液(B−1)を5.41g量り取り、マグネチックスターラーで2時間撹拌して、液晶配向剤(A−3)を得た。
撹拌子を入れた50mL三角フラスコに、実施例2で得られたポリイミドの溶液(A−2)5.50g、合成例2で得られたポリイミドの溶液(B−2)を5.51g量り取り、マグネチックスターラーで2時間撹拌して、液晶配向剤(A−4)を得た。
撹拌子を入れた50mL三角フラスコに、合成例1で得られたポリアミック酸の溶液(B−1)5.42g、合成例3で得られたポリアミック酸の溶液(B−3)を5.42g量り取り、マグネチックスターラーで2時間撹拌して、液晶配向剤(A−5)を得た。
撹拌子を入れた50mL三角フラスコに、実施例1で得られたポリアミック酸の溶液(A−1)5.62g、合成例4で得られたポリアミック酸の溶液(B−4)を5.62g量り取り、マグネチックスターラーで2時間撹拌して、液晶配向剤(A−6)を得た。
実施例および合成例で得られた液晶配向剤を1.0μmのフィルターで濾過した後、透明電極付きガラス基板上にスピンコートし、80℃のホットプレート上で2分間乾燥後、230℃で20分間焼成して膜厚100nmの塗膜を得た。このようにして得られた2枚の基板を用意し、一方の基板の液晶配向膜面上に4μmビーズスペーサーを散布した後、シール剤(協立化学製XN−1500T)を滴下した。次いで、他方の基板の液晶配向膜面を内側にし、基板の重なり幅が1cmになるように、貼り合わせを行った。その際、貼り合わせ後のシール剤の直径が約3mmとなるようにシール剤滴下量を調整した。貼り合わせた2枚の基板をクリップにて固定した後、120℃で1時間熱硬化させて、接着性評価用のサンプルを作製した。
実施例1〜6で得られた液晶配向剤(A−1)〜(A−6)をそれぞれ1.0μmのフィルターで濾過した後、上記記載のように接着性評価用のサンプルを作製しシール接着力を評価した結果を表4に示す。
合成例1〜4で得られた液晶配向剤(B−1)〜(B−4)をそれぞれ1.0μmのフィルターで濾過した後、上記記載のように接着性評価用のサンプルを作製しシール接着力を評価した結果を表4に示す。
撹拌装置及び窒素導入管付きの200mLの四つ口フラスコに、DA−1を4.30g(17.6mmol)、DA−2を2.67g(4.80mmol)、DA−4を3.27g(9.57mmol)量り取り、NMPを75.1g加え、窒素を送りながら撹拌して溶解させた。このジアミン溶液を水冷下で撹拌しながら、CA−1を4.66g(20.7mmol)添加し、さらにNMPを9.34g加え、窒素雰囲気下40℃で3時間撹拌した。さらに、CA−2を1.78g(9.08mmol)添加し、さらにNMPを8.00g加え、窒素雰囲気下23℃で4時間撹拌し、ポリアミック酸の溶液を得た。このポリアミック酸の溶液の温度25℃における粘度は304mPa・sであった。
撹拌装置及び窒素導入管付きの200mLの四つ口フラスコに、DA−1を4.30g(17.6mmol)、DA−2を2.67g(4.80mmol)、DA−3を1.91g(4.80mmol)、DA−4を1.64g(4.80mmol)量り取り、NMPを77.1g加え、窒素を送りながら撹拌して溶解させた。このジアミン溶液を水冷下で撹拌しながら、CA−1を4.66g(20.7mmol)添加し、さらにNMPを8.88g加え、窒素雰囲気下40℃で3時間撹拌した。さらに、CA−2を1.71g(8.69mmol)添加し、さらにNMPを8.00g加え、窒素雰囲気下23℃で4時間撹拌し、ポリアミック酸の溶液を得た。このポリアミック酸の溶液の温度25℃における粘度は312mPa・sであった。
撹拌装置及び窒素導入管付きの1Lの四つ口フラスコに、DA−1を4.30g(17.6mmol)、DA−3を5.73g(14.3mmol)量り取り、NMPを73.6g加え、窒素を送りながら撹拌して溶解させた。このジアミン溶液を水冷下で撹拌しながら、CA−1を4.66g(20.7mmol)添加し、さらにNMPを9.69g加え、窒素雰囲気下40℃で3時間撹拌した。さらに、CA−2を1.50g(7.65mmol)添加し、さらにNMPを8.53g加え、窒素雰囲気下23℃で4時間撹拌し、ポリアミック酸の溶液を得た。このポリアミック酸の溶液の温度25℃における粘度は290mPa・sであった。
以下に、液晶配向性を評価するための液晶セルの作製方法を示す。
実施例2、4、13、14で得られた液晶配向剤(A−2)、(A−4)、(A−7)及び(A−8)をそれぞれ1.0μmのフィルターで濾過した後、上記記載のように接着性評価用のサンプルを作製しシール接着力を評価した結果および上記液晶セルの角度Δの結果を表5に示す。
合成例5で得られた液晶配向剤(B−5)を1.0μmのフィルターで濾過した後、上記記載のように接着性評価用のサンプルを作製しシール接着力を評価した結果および上記液晶セルの角度Δの結果を表5に示す。
Claims (7)
- 芳香族複素環と1級アミノ基及び2級アミノ基を構造中に有する重合体を含有することを特徴とする、液晶配向膜。
- 焼成物からなる膜であり、前記芳香族複素環の骨格と前記1級アミノ基及び前記2級アミノ基が焼成により生成された構造中に含有することを特徴とする、請求項1に記載の液晶配向膜。
- 前記芳香族複素環が、ピリジン骨格、ベンズイミダゾール骨格、またはイミダゾール骨格であることを特徴とする、請求項1または請求項2に記載の液晶配向膜。
- 前記焼成物が、100℃〜300℃の焼成温度により生成されてなることを特徴とする、請求項2に記載の液晶配向膜。
- 請求項1から請求項4のいずれか1項に記載の液晶配向膜を具備することを特徴とする、液晶表示素子。
- 請求項1から請求項4のいずれか1項に記載の液晶配向膜を得るための液晶配向剤。
- 下記成分(A)及び下記成分(B)から選ばれる少なくとも1種のジアミン並びに下記成分(C)の骨格を含有するジアミンを含有するジアミン成分と、テトラカルボン酸二無水物との反応物であるポリアミック酸及びそのイミド化物であるポリイミドから選ばれる少なくとも1つの重合体を含有することを特徴とする、請求項6に記載の液晶配向剤。
(A)成分:下記式(1−1)及び下記式(1−2)から選ばれる少なくとも1種の構造を有するジアミン
(B)成分:下記式(2)の構造を有するジアミン
(C)成分:下記式(a)及び下記式(b)から選ばれる少なくとも1種の構造を有するジアミン
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