JP6384663B2 - 重合体、液晶配向剤、液晶配向膜及び液晶表示素子 - Google Patents
重合体、液晶配向剤、液晶配向膜及び液晶表示素子 Download PDFInfo
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- JP6384663B2 JP6384663B2 JP2014211961A JP2014211961A JP6384663B2 JP 6384663 B2 JP6384663 B2 JP 6384663B2 JP 2014211961 A JP2014211961 A JP 2014211961A JP 2014211961 A JP2014211961 A JP 2014211961A JP 6384663 B2 JP6384663 B2 JP 6384663B2
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- liquid crystal
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- polyamic acid
- diamine
- polymer
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- 239000004973 liquid crystal related substance Substances 0.000 title claims description 177
- 239000003795 chemical substances by application Substances 0.000 title claims description 63
- 229920000642 polymer Polymers 0.000 title claims description 61
- 150000004985 diamines Chemical class 0.000 claims description 102
- 229920005575 poly(amic acid) Polymers 0.000 claims description 99
- -1 alicyclic hydrocarbon Chemical class 0.000 claims description 74
- 150000000000 tetracarboxylic acids Chemical class 0.000 claims description 26
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 25
- 229920001721 polyimide Polymers 0.000 claims description 21
- 239000004642 Polyimide Substances 0.000 claims description 19
- 150000002148 esters Chemical class 0.000 claims description 19
- 125000004432 carbon atom Chemical group C* 0.000 claims description 16
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 16
- 229910052799 carbon Inorganic materials 0.000 claims description 15
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 12
- 125000000217 alkyl group Chemical group 0.000 claims description 8
- 125000002947 alkylene group Chemical group 0.000 claims description 8
- 125000005843 halogen group Chemical group 0.000 claims description 8
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 8
- 229930195733 hydrocarbon Natural products 0.000 claims description 6
- 125000003342 alkenyl group Chemical group 0.000 claims description 5
- 229910052736 halogen Inorganic materials 0.000 claims description 5
- 150000002367 halogens Chemical class 0.000 claims description 5
- 239000004215 Carbon black (E152) Substances 0.000 claims description 4
- 125000000304 alkynyl group Chemical group 0.000 claims description 4
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 4
- 150000003949 imides Chemical class 0.000 claims description 2
- 238000004581 coalescence Methods 0.000 claims 1
- 239000000243 solution Substances 0.000 description 54
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 52
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 35
- 230000015572 biosynthetic process Effects 0.000 description 34
- 238000003786 synthesis reaction Methods 0.000 description 33
- 150000001875 compounds Chemical class 0.000 description 32
- 238000006243 chemical reaction Methods 0.000 description 29
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 28
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 26
- 239000000758 substrate Substances 0.000 description 26
- 230000000052 comparative effect Effects 0.000 description 25
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- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 description 24
- 210000002858 crystal cell Anatomy 0.000 description 24
- 229910052757 nitrogen Inorganic materials 0.000 description 23
- 239000002904 solvent Substances 0.000 description 22
- 238000003756 stirring Methods 0.000 description 22
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 21
- 238000000034 method Methods 0.000 description 21
- 239000003960 organic solvent Substances 0.000 description 21
- 239000000203 mixture Substances 0.000 description 19
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 18
- GTDPSWPPOUPBNX-UHFFFAOYSA-N ac1mqpva Chemical compound CC12C(=O)OC(=O)C1(C)C1(C)C2(C)C(=O)OC1=O GTDPSWPPOUPBNX-UHFFFAOYSA-N 0.000 description 17
- 238000005160 1H NMR spectroscopy Methods 0.000 description 16
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 15
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 15
- 238000005259 measurement Methods 0.000 description 15
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 description 11
- 229920003270 Cymel® Polymers 0.000 description 10
- IAZDPXIOMUYVGZ-WFGJKAKNSA-N Dimethyl sulfoxide Chemical compound [2H]C([2H])([2H])S(=O)C([2H])([2H])[2H] IAZDPXIOMUYVGZ-WFGJKAKNSA-N 0.000 description 10
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 10
- 239000000706 filtrate Substances 0.000 description 10
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 10
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 9
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 9
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 description 9
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 9
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 9
- 150000001721 carbon Chemical group 0.000 description 9
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 9
- 238000001914 filtration Methods 0.000 description 9
- 238000000576 coating method Methods 0.000 description 8
- ANSXAPJVJOKRDJ-UHFFFAOYSA-N furo[3,4-f][2]benzofuran-1,3,5,7-tetrone Chemical compound C1=C2C(=O)OC(=O)C2=CC2=C1C(=O)OC2=O ANSXAPJVJOKRDJ-UHFFFAOYSA-N 0.000 description 8
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 7
- 150000007974 melamines Chemical class 0.000 description 7
- 239000012299 nitrogen atmosphere Substances 0.000 description 7
- GZVHEAJQGPRDLQ-UHFFFAOYSA-N 6-phenyl-1,3,5-triazine-2,4-diamine Chemical class NC1=NC(N)=NC(C=2C=CC=CC=2)=N1 GZVHEAJQGPRDLQ-UHFFFAOYSA-N 0.000 description 6
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 6
- HEDRZPFGACZZDS-MICDWDOJSA-N Trichloro(2H)methane Chemical compound [2H]C(Cl)(Cl)Cl HEDRZPFGACZZDS-MICDWDOJSA-N 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 6
- 238000006358 imidation reaction Methods 0.000 description 6
- 230000003993 interaction Effects 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 6
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 5
- 125000005907 alkyl ester group Chemical group 0.000 description 5
- LZCLXQDLBQLTDK-UHFFFAOYSA-N ethyl 2-hydroxypropanoate Chemical compound CCOC(=O)C(C)O LZCLXQDLBQLTDK-UHFFFAOYSA-N 0.000 description 5
- VPVSTMAPERLKKM-UHFFFAOYSA-N glycoluril Chemical compound N1C(=O)NC2NC(=O)NC21 VPVSTMAPERLKKM-UHFFFAOYSA-N 0.000 description 5
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 description 4
- CTMHWPIWNRWQEG-UHFFFAOYSA-N 1-methylcyclohexene Chemical compound CC1=CCCCC1 CTMHWPIWNRWQEG-UHFFFAOYSA-N 0.000 description 4
- XLLIQLLCWZCATF-UHFFFAOYSA-N 2-methoxyethyl acetate Chemical compound COCCOC(C)=O XLLIQLLCWZCATF-UHFFFAOYSA-N 0.000 description 4
- QCAHUFWKIQLBNB-UHFFFAOYSA-N 3-(3-methoxypropoxy)propan-1-ol Chemical compound COCCCOCCCO QCAHUFWKIQLBNB-UHFFFAOYSA-N 0.000 description 4
- SYBYTAAJFKOIEJ-UHFFFAOYSA-N 3-Methylbutan-2-one Chemical compound CC(C)C(C)=O SYBYTAAJFKOIEJ-UHFFFAOYSA-N 0.000 description 4
- FFWSICBKRCICMR-UHFFFAOYSA-N 5-methyl-2-hexanone Chemical compound CC(C)CCC(C)=O FFWSICBKRCICMR-UHFFFAOYSA-N 0.000 description 4
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 4
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 4
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 4
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- 125000003277 amino group Chemical group 0.000 description 4
- 125000003118 aryl group Chemical group 0.000 description 4
- DKPFZGUDAPQIHT-UHFFFAOYSA-N butyl acetate Chemical compound CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 4
- XUPYJHCZDLZNFP-UHFFFAOYSA-N butyl butanoate Chemical compound CCCCOC(=O)CCC XUPYJHCZDLZNFP-UHFFFAOYSA-N 0.000 description 4
- 210000004027 cell Anatomy 0.000 description 4
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
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- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 4
- 239000012074 organic phase Substances 0.000 description 4
- 229920001223 polyethylene glycol Polymers 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
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- 125000006850 spacer group Chemical group 0.000 description 4
- HHVIBTZHLRERCL-UHFFFAOYSA-N sulfonyldimethane Chemical compound CS(C)(=O)=O HHVIBTZHLRERCL-UHFFFAOYSA-N 0.000 description 4
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical group C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 description 3
- PPPFYBPQAPISCT-UHFFFAOYSA-N 2-hydroxypropyl acetate Chemical compound CC(O)COC(C)=O PPPFYBPQAPISCT-UHFFFAOYSA-N 0.000 description 3
- NNOHXABAQAGKRZ-UHFFFAOYSA-N 3,5-dinitrobenzoyl chloride Chemical compound [O-][N+](=O)C1=CC(C(Cl)=O)=CC([N+]([O-])=O)=C1 NNOHXABAQAGKRZ-UHFFFAOYSA-N 0.000 description 3
- VHYFNPMBLIVWCW-UHFFFAOYSA-N 4-Dimethylaminopyridine Chemical compound CN(C)C1=CC=NC=C1 VHYFNPMBLIVWCW-UHFFFAOYSA-N 0.000 description 3
- NNIPOYNUFNLQMO-UHFFFAOYSA-N 4-[2-(methylamino)ethyl]aniline Chemical compound CNCCC1=CC=C(N)C=C1 NNIPOYNUFNLQMO-UHFFFAOYSA-N 0.000 description 3
- LPEKGGXMPWTOCB-UHFFFAOYSA-N 8beta-(2,3-epoxy-2-methylbutyryloxy)-14-acetoxytithifolin Natural products COC(=O)C(C)O LPEKGGXMPWTOCB-UHFFFAOYSA-N 0.000 description 3
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Description
本実施形態である重合体は、液晶配向膜の作製に有用なものであり、下記式[1]で表されるジアミンを含むジアミン成分と、テトラカルボン酸誘導体と、を反応させて得られるポリアミック酸、ポリアミック酸エステル、又は該ポリアミック酸及び/又はポリアミック酸エステルを脱水閉環(イミド化)して得られるポリイミドからなる。
本実施形態で用いられるジアミン成分は、上記式[1]で表されるジアミンを含む。かかるジアミンによれば、アミド結合(−NHCO−)及びカルボキシル基(−COOH)の両方を側鎖に有するため、アミド結合−アミド結合、アミド結合−カルボキシル基、カルボキシル基−カルボキシル基といった部分構造間での相互作用が生じるようになり、プロトン移動が起こりやすくなる。このような電気化学的に活性な状態は、残留電圧の低下だけでなく、液晶中の不純物成分をトラップする機能があるため電圧保持特性の向上にも寄与する。また、構造間での相互作用により、分子の配列制御性が高くなり良好な液晶配向性が確保できる。従って、上記式[1]で表されるジアミンを含むジアミン成分を反応させることで、良好な液晶配向性を確保でき、電圧保持特性に優れ、その上で、焼き付きを抑制することのできる液晶配向膜を作製するのに有用な重合体、該重合体を含む液晶配向剤、該液晶配向剤を用いてなる液晶配向膜、及び該液晶配向膜を具備する液晶表示素子を得ることができる。
本実施形態で用いられるテトラカルボン酸誘導体は特に限定されず、脂環式構造を有するもの、脂肪族構造を有するもの、更には芳香族構造を有するもの、の何れも用いることができる。
上記式[1]で表されるジアミンを含有するジアミン成分と、テトラカルボン酸誘導体と、の反応により、ポリイミド前駆体(ポリアミック酸)を得ることができ、また、このポリアミック酸のカルボキシル基をエステルに変換することでポリアミック酸エステルを得ることができる。更に、ポリアミック酸や該ポリアミック酸エステルを閉環(イミド化)することにより、ポリイミドを得ることができる。これらのポリアミック酸、ポリアミック酸エステル及びポリイミドの何れも、液晶配向剤を得るための重合体として有用なものである。尚、ポリイミドを得る際の脱水閉環率(イミド化率)は、必ずしも100%である必要はなく、0%から100%の範囲で用途や目的に応じて任意に調整することができる。
本実施形態の液晶配向剤は、液晶配向膜を形成するための塗布液であり、重合体被膜を形成するための重合体成分が有機溶媒に溶解した溶液である。この重合体成分は、上記式[1]で表されるジアミンを含むジアミン成分を用いて得られるポリアミック酸、ポリアミック酸エステル、ポリイミド及びポリアミドから選ばれる少なくとも一種の重合体を含む。液晶配向剤が含有する重合体成分の含有量は1〜20質量%が好ましく、より好ましくは3〜15質量%、特に好ましくは3〜10質量%である。
本実施形態の液晶配向剤は、基板等上に塗布、焼成した後、ラビング処理や光照射等で配向処理をして、又は垂直配向用途では配向処理無しで液晶配向膜として用いることができる。この際、用いる基板としては透明性の高い基板であれば特に限定されず、ガラス基板、又はアクリル基板やポリカーボネート基板等のプラスチック基板を用いることができる。また、液晶駆動のためのITO(Indium Tin Oxide)電極等が形成された基板を用いることがプロセスの簡素化の観点から好ましい。また、反射型の液晶表示素子では片側の基板のみにならばシリコンウエハー等の不透明な物でも使用でき、この場合の電極はアルミ等の光を反射する材料も使用できる。
本実施形態の液晶表示素子は、上記した手法により本実施形態の液晶配向剤から液晶配向膜付き基板を得た後、公知の方法で液晶セルを作製し、液晶表示素子としたものである。一例を挙げるならば、対向するように配置された2枚の基板と、基板間に設けられた液晶層と、基板と液晶層との間に設けられ本発明の液晶配向剤により形成された上記液晶配向膜とを有する液晶セルを具備する液晶表示素子である。
CBDA:1,2,3,4−シクロブタンテトラカルボン酸二無水物
PMDA:ピロメリット酸二無水物
BODA:ビシクロ[3.3.0]オクタン−2,4,6,8−テトラカルボン酸二無水物
1,3−DMCBDE−Cl:下記式のテトラカルボン酸ジアルキルエステルジハライド化合物
DABA:4,4’−ジアミノベンズアニリド
DBA:3,5−ジアミノ安息香酸
Me−4AphA:N−メチル−2−(4−アミノフェニル)エチルアミン(「4−アミノ−N−メチルフェネチルアミン」とも称される。)
DADPA:4,4’−ジアミノジフェニルアミン
DDE:4,4’−ジアミノジフェニルエーテル
DA−2MG:1,2−ビス(4−アミノフェノキシ)エタン
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
(合成例1)
ジアミン[DA1]を、下記の反応により合成した。
ジアミン[DA2]を、下記の反応により合成した。
ジアミン[DA3]を、下記の反応により合成した。
(合成例4)
撹拌装置及び窒素導入管付きの50ml四つ口フラスコに、上記合成例1で製造したジアミン[DA1]を1.85g(8.30mmol)、NMP28.3gを加え、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撹拌しながらPMDA1.72g(7.89mmol)を添加し、更に固形分濃度が10質量%になるようにNMPを加え、窒素雰囲気下、室温で2時間撹拌した。これにより、重合体としてのポリアミック酸(PAA−1)の溶液を得た。このポリアミック酸溶液の25℃における粘度をE型粘度計(東機産業社製)で確認したところ、22.9mPa・sであった。このポリアミック酸の数平均分子量は6,782、重量平均分子量は20,520であった。
撹拌装置及び窒素導入管付きの50ml四つ口フラスコに、上記合成例2で製造したジアミン[DA2]を1.85g(8.30mmol)、NMP28.3gを加え、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撹拌しながらPMDA1.72g(7.89mmol)を添加し、更に固形分濃度が10質量%になるようにNMPを加え、窒素雰囲気下、室温で2時間撹拌した。これにより、重合体としてのポリアミック酸(PAA−2)の溶液を得た。このポリアミック酸溶液の25℃における粘度をE型粘度計(東機産業社製)で確認したところ、29.0mPa・sであった。このポリアミック酸の数平均分子量は9,714、重量平均分子量は20,072であった。
撹拌装置及び窒素導入管付きの50ml四つ口フラスコに、上記合成例3で製造したジアミン[DA3]を2.33g(8.30mmol)、NMP28.8gを加え、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撹拌しながらPMDA1.72g(7.89mmol)を添加し、更に固形分濃度が10質量%になるようにNMPを加え、窒素雰囲気下、室温で2時間撹拌した。これにより、重合体としてのポリアミック酸(PAA−3)の溶液を得た。このポリアミック酸溶液の25℃における粘度をE型粘度計(東機産業社製)で確認したところ、33.7mPa・sであった。このポリアミック酸の数平均分子量は10,526、重量平均分子量は23,704であった。
撹拌装置付き及び窒素導入管付きの50ml四つ口フラスコに、上記合成例1で製造した[DA1]を1.11g(4.98mmol)、Me−4APhAを0.50g(3.32mmol)、NMP28.3gを加え、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撹拌しながらCBDA0.93g(4.73mmol)、PMDA0.69g(3.16mmol)を添加し、更に固形分濃度が10質量%になるようにNMPを加え、窒素雰囲気下、室温で2時間撹拌してポリアミック酸(PAA−4)の溶液を得た。このポリアミック酸溶液の25℃における粘度をE型粘度計(東機産業社製)で確認したところ、103mPa・sであった。また、このポリアミド酸の数平均分子量は10,500、重量平均分子量は23,100であった。
撹拌装置及び窒素導入管付きの50mLの四つ口フラスコに、上記合成例1で製造した[DA1]を0.74g(3.32mmol)、DADPAを0.33g(1.66mmol)及びDDEを0.66g(3.32mmol)取り、NMP(12.0g)を加えて、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撹拌しながらBODAを1.48g(5.91mmol)を添加し、25℃で2時間撹拌した。次に、CBDAを0.38g(1.97mmol)と固形分濃度が10質量%になるようにNMPを加え、25℃で4時間撹拌してポリアミック酸溶液(PAA−5)を得た。このポリアミック酸溶液の25℃における粘度をE型粘度計(東機産業社製)で確認したところ、120mPa・sであった。このポリアミド酸の数平均分子量は11,300、重量平均分子量は27,100であった。
撹拌装置付きの500mLの四つ口フラスコを窒素雰囲気とし、上記合成例1で製造した[DA1]を0.74g(3.36mmol)を取り、DA−2MGを1.21g(4.94mmol)を入れ、NMP(111g)及びピリジン(6.18g)を加え、撹拌して溶解させた。次に、このジアミン溶液を撹拌しながら1,3−DMCBDE−Clを2.56g(7.88mmol)を添加し、15℃で15時間反応させた。得られたポリアミック酸アルキルエステルの溶液を、水(1230g)に撹拌しながら投入し、析出した白色沈殿を濾取した後、IPA(イソプロピルアルコール)(1230g)で5回洗浄し、乾燥することで白色のポリアミド酸アルキルエステル粉末を3.55g得た。このポリアミック酸アルキルエステルの数平均分子量は15,200、重量平均分子量は31,000であった。
上記式[1]で表されるジアミンを用いず、その代わりにその他のジアミン(上記式[1]で表されるジアミン以外のジアミン)を用いた点を除き、基本的には合成例4と同様の手法により、重合体・液晶配向剤を作製した。
比較合成例1と同様に、上記式[1]で表されるジアミンに代え、その他のジアミンを用いて重合体・液晶配向剤を作製した。
合成例4〜9により得られた重合体、及び比較合成例1〜2により得られた比較用重合体の分子量は、常温ゲル浸透クロマトグラフィー(GPC)装置(GPC−101)(昭和電工社製)、カラム(KD−803,KD−805)(Shodex社製)を用いて、以下の条件で測定したものである。
・カラム温度:50℃
・溶離液:N,N’−ジメチルホルムアミド(添加剤として、臭化リチウム−水和物(LiBr・H2O)が30mmol/L、リン酸・無水結晶(o−リン酸)が30mmol/L、THFが10ml/L)
・流速:1.0ml/min
・検量線作成用標準サンプル:TSK
・標準ポリエチレンオキサイド(分子量;約900,000、150,000、100,000及び30,000)(東ソー社製)及びポリエチレングリコール(分子量;約12,000、4,000及び1,000)(ポリマーラボラトリー社製)。
(実施例1〜6)
上記合成例4〜9で得られた各液晶配向剤を用い、以下の手法により液晶セルをそれぞれ作製した。尚、これらの合成例の各液晶配向処理剤の物性(特性)は、後述する表3に示される。
上記比較合成例1〜2で得られた各比較用液晶配向剤を用い、実施例1〜6と同様の手法により、比較用液晶セルをそれぞれ作製した。尚、これらの比較合成例の各液晶配向処理剤の物性(特性)は、後述する表3に示される。
上記実施例1〜6で作製した液晶セル、及び上記比較例1〜2で作製した比較用液晶セルについて、初期配向を目視で観察した。評価は以下のように行った。結果は表3に示す。
○:良好に配向している。
×:光抜けや配向不良箇所が多く観察される。
上記実施例1〜6で作製した液晶セル、及び上記比較例1〜2で作製した比較用液晶セルについて、4Vの電圧を60μs間印加し、16.67ms後の電圧を測定することで、初期値からの変動を電圧保持率(%)として計算した。測定の際、液晶セルの温度を23℃、60℃、90℃とし、それぞれの温度で測定を行った。温度上昇に対しても電圧保持率を高い値で維持できるほど、電圧保持特性に優れるといえる。電圧保持率の測定には東陽テクニカ社製のVHR−1電圧保持率測定装置を使用した。結果は表3に示す。
上記実施例1〜6で作製した液晶セル、及び上記比較例1〜2で作製した比較用液晶セルについて、東陽テクニカ製液晶物性評価装置6254型を用い、誘電吸収法による残留電圧の測定を行った。測定条件は、液晶セルに直流10Vを30分間印加後、1秒ショートして20分間電位差を観察し、最大の残留電圧(mV)と最小の残留電圧(mV)を記載した。測定温度は60℃である。この値が小さいほど電気特性が良好といえる。結果は表3に示す。
Claims (7)
- 下記式[1]で表されるジアミンを含むジアミン成分と、テトラカルボン酸誘導体と、を反応させて得られるポリアミック酸、ポリアミック酸エステル、又は該ポリアミック酸及び/又はポリアミック酸エステルを脱水閉環(イミド化)して得られるポリイミドからなることを特徴とする重合体。
(式中、R1は、エーテル結合、チオエーテル結合、アミド結合、又は炭素数1〜10で形成されるアルキレン基、アルケニル基、アルキニル基、脂環式炭化水素及び芳香族炭化水素からなる群より選ばれる結合基である。R1に炭素原子が含まれる場合、該炭素原子に結合する水素原子は、ハロゲン原子、ハロゲン含有アルキル基、水酸基、及びカルボキシル基からなる群より選ばれる少なくとも1種で置換されていてもよい。) - 前記式[1]中、R1は、炭素数1〜3で形成されるアルキレン基であり、R1に含まれる炭素原子に結合する水素原子がカルボキシル基で置換されていてもよいことを特徴とする請求項1に記載の重合体。
- 前記ジアミン成分は、前記式[1]で表されるジアミンを5mol%以上含むことを特徴とする請求項1〜3の何れか一項に記載の重合体。
- 請求項1〜4の何れか一項に記載の重合体を含むことを特徴とする液晶配向剤。
- 請求項5に記載の液晶配向剤を用いてなることを特徴とする液晶配向膜。
- 請求項6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。
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