JPH07120768A - Liquid crystal orienting agent - Google Patents

Liquid crystal orienting agent

Info

Publication number
JPH07120768A
JPH07120768A JP26874993A JP26874993A JPH07120768A JP H07120768 A JPH07120768 A JP H07120768A JP 26874993 A JP26874993 A JP 26874993A JP 26874993 A JP26874993 A JP 26874993A JP H07120768 A JPH07120768 A JP H07120768A
Authority
JP
Japan
Prior art keywords
liquid crystal
essential component
acid containing
dianhydride
polyamic acid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP26874993A
Other languages
Japanese (ja)
Other versions
JP2834652B2 (en
Inventor
Sumitoshi Asakuma
純俊 朝隈
Toshimasa Eguchi
敏正 江口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Bakelite Co Ltd
Original Assignee
Sumitomo Bakelite Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application granted granted Critical
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  • Compositions Of Macromolecular Compounds (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
  • Liquid Crystal (AREA)

Abstract

PURPOSE:To obtain a liquid crystal oriented film showing a stable oriented state of the liquid crystal and a pretilt angle without depending on the process conditions or the use environment and having good electro-optical characteristics by incorporating a polyamide acid containing aliphatic tetracarboxylic acid dianhydride as an essential component and a polyamide acid containing aromatic tetracarboxylic acid dianhydride as an essential component. CONSTITUTION:This orienting agent for a liquid crystal contains a polyamide acid containing aliphatic tetracarboxylic acid dianhydride as an essential component and a polyamide acid containing aromatic tetracarboxylic acid dianhydride as an essential component. When a compd. expressed by formula I is used as the polyamide acid containing aliphatic tetracarboxylic acid dianhydride as an essential component, especially excellent characteristics as a liquid crystal oriented film can be obtd. When a compd. expressed by formula II is used as the polyamide acid containing aromatic tetracarboxylic acid dianhydride as an essential component, especially excellent characteristics as a liquid crystal oriented film can be obtd.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は液晶配向剤に関わる。さ
らに詳しくは、TN方式、STN方式、あるいは強誘電
液晶方式の液晶表示素子の液晶配向膜を与えるために好
適に使用し得る液晶配向剤に関する。
FIELD OF THE INVENTION The present invention relates to a liquid crystal aligning agent. More specifically, the present invention relates to a liquid crystal aligning agent that can be suitably used to provide a liquid crystal aligning film of a liquid crystal display device of TN type, STN type, or ferroelectric liquid crystal type.

【0002】[0002]

【従来の技術】従来、液晶ディスプレイの配向膜として
ポリビニルアルコールやポリアミド樹脂、ポリアミドイ
ミド樹脂、ポリイミド樹脂の様な有機高分子膜を使用す
る方法が知られている。これらの中で特にポリイミド樹
脂は各種の液晶を配向させる働きを有し、かつ耐熱性等
にも優れていることから液晶配向膜として広く用いられ
ている。
2. Description of the Related Art Conventionally, there has been known a method of using an organic polymer film such as polyvinyl alcohol, polyamide resin, polyamideimide resin, or polyimide resin as an alignment film of a liquid crystal display. Of these, the polyimide resin is widely used as a liquid crystal alignment film because it has the function of aligning various liquid crystals and has excellent heat resistance.

【0003】しかし、近年の液晶ディスプレイの特性向
上に伴い、配向膜材料に対しても従来にもまして優れた
特性が要求されるようになってきた。具体的には、液晶
配向膜の機能の面においては、種々の条件下で優れた液
晶配向性、及び安定したプレチルト角を示し、かつ良好
な電気光学特性を有するといったことであり、また、プ
ロセス上では均一な塗膜形成性、耐ラビング性等が挙げ
られる。従来のポリイミド系液晶配向材としては、芳香
族ポリアミド酸、脂環式ポリアミド酸、脂環式可溶性ポ
リイミド等があるが、これらのうち、芳香族ポリアミド
酸系配向剤は一般に液晶表示素子としての電気特性が悪
く、又、脂環式ポリアミド酸系配向剤は液晶の配向性に
劣り、ある程度良好な液晶配向性や安定したプレチルト
角を得るためには高い焼成温度が必要である。さらに、
脂環式可溶性ポリイミド系材料は基板に対する密着性が
劣るためラビングによる塗膜の剥がれが起きやすいとい
った問題がある。以上のように、現在使用されているポ
リイミド系液晶配向剤は、種々の要求に十分こたえてい
るとはいえず、より優れた液晶配向膜材料が求められて
いる。
However, as the characteristics of liquid crystal displays have been improved in recent years, the characteristics of the alignment film material have been required to be more excellent than ever before. Specifically, in terms of the function of the liquid crystal alignment film, the liquid crystal alignment film has excellent liquid crystal alignment properties under various conditions, a stable pretilt angle, and good electro-optical properties. In the above, uniform film forming property, rubbing resistance and the like can be mentioned. As the conventional polyimide-based liquid crystal alignment material, there are aromatic polyamic acid, alicyclic polyamic acid, alicyclic soluble polyimide, and the like. Among them, the aromatic polyamic acid-based aligning agent is generally used as an electric liquid crystal display device. The characteristics are poor, and the alicyclic polyamic acid-based aligning agent is inferior in the liquid crystal aligning property, and a high firing temperature is required to obtain a good liquid crystal aligning property and a stable pretilt angle. further,
The alicyclic soluble polyimide-based material has a problem that the coating film is liable to be peeled off by rubbing because of poor adhesion to the substrate. As described above, it cannot be said that the polyimide-based liquid crystal aligning agents currently used meet various requirements, and more excellent liquid crystal aligning film materials are required.

【0004】[0004]

【発明が解決しようとする課題】本発明は従来の液晶配
向膜材料に比べ、液晶表示素子組立のプロセス条件や使
用環境によらず安定した液晶配向性、プレチルト角を示
し、かつ良好な電気光学特性を示す液晶配向膜を与える
液晶配向剤を提供するものである。
DISCLOSURE OF THE INVENTION The present invention shows stable liquid crystal alignment and pretilt angle irrespective of the process conditions for assembling a liquid crystal display element and the use environment, as compared with the conventional liquid crystal alignment film materials, and has a good electro-optical property. The present invention provides a liquid crystal aligning agent that gives a liquid crystal aligning film exhibiting characteristics.

【0005】[0005]

【課題を解決するための手段】本発明は、脂肪族テトラ
カルボン酸二無水物を必須成分とするポリアミド酸と、
芳香族テトラカルボン酸二無水物を必須成分とするポリ
アミド酸を含有することを特徴とする液晶配向剤であ
る。
The present invention is directed to a polyamic acid containing an aliphatic tetracarboxylic acid dianhydride as an essential component,
A liquid crystal aligning agent comprising a polyamic acid containing an aromatic tetracarboxylic dianhydride as an essential component.

【0006】本発明において使用される脂肪族テトラカ
ルボン酸二無水物を必須成分とするポリアミド酸と、芳
香族テトラカルボン酸二無水物を必須成分とするポリア
ミド酸についてはその構成原料は特に限定されるもので
はないが、脂肪族テトラカルボン酸二無水物を必須成分
とするポリアミド酸においては、脂肪族テトラカルボン
酸二無水物として以下に示す化合物を使用した場合に液
晶配向膜として特に優れた特性を示す。これらの脂肪族
テトラカルボン酸二無水物は単独、あるいは2種以上併
用して使用することができる。
The constituent raw materials of the polyamic acid containing an aliphatic tetracarboxylic dianhydride as an essential component and the polyamic acid containing an aromatic tetracarboxylic dianhydride as an essential component used in the present invention are not particularly limited. However, in a polyamic acid containing an aliphatic tetracarboxylic acid dianhydride as an essential component, particularly excellent properties as a liquid crystal alignment film when the compound shown below is used as the aliphatic tetracarboxylic acid dianhydride. Indicates. These aliphatic tetracarboxylic dianhydrides can be used alone or in combination of two or more.

【0007】[0007]

【化4】 [Chemical 4]

【0008】又、脂肪族テトラカルボン酸二無水物を必
須成分とするポリアミド酸では上で示した様な脂肪族テ
トラカルボン酸二無水物を必須成分とするが、液晶配向
膜としての特性を損なわない範囲において芳香族テトラ
カルボン酸二無水物も併用することができる。その際、
芳香族テトラカルボン酸二無水物は全テトラカルボン酸
二無水物の内、50モル%以下であることが好ましい。
Further, in the polyamic acid containing an aliphatic tetracarboxylic dianhydride as an essential component, the aliphatic tetracarboxylic dianhydride as shown above is contained as an essential component, but the characteristics as a liquid crystal alignment film are impaired. Aromatic tetracarboxylic dianhydrides can also be used in combination as long as they are not present. that time,
The aromatic tetracarboxylic dianhydride is preferably 50 mol% or less in the total tetracarboxylic dianhydride.

【0009】一方、芳香族テトラカルボン酸二無水物を
必須成分とするポリアミド酸においては、芳香族テトラ
カルボン酸二無水物として以下に示す化合物を使用した
場合に液晶配向膜として特に優れた特性を示す。これら
の芳香族テトラカルボン酸二無水物は単独、あるいは2
種以上併用して使用することができる。
On the other hand, in the polyamic acid containing an aromatic tetracarboxylic dianhydride as an essential component, when the following compounds are used as the aromatic tetracarboxylic dianhydride, particularly excellent characteristics as a liquid crystal alignment film are obtained. Show. These aromatic tetracarboxylic dianhydrides may be used alone or
They can be used in combination of one or more species.

【0010】[0010]

【化5】 [Chemical 5]

【0011】又、芳香族テトラカルボン酸二無水物を必
須成分とするポリアミド酸では上で示した様な芳香族テ
トラカルボン酸二無水物を必須成分とするが、液晶配向
膜としての特性を損なわない範囲において脂肪族テトラ
カルボン酸二無水物も併用することができる。その際、
脂肪族テトラカルボン酸二無水物は全テトラカルボン酸
二無水物の内、50モル%以下であることが好ましい。
Further, in a polyamic acid containing an aromatic tetracarboxylic dianhydride as an essential component, the aromatic tetracarboxylic dianhydride as shown above is used as an essential component, but the characteristics as a liquid crystal alignment film are impaired. Aliphatic tetracarboxylic dianhydride can also be used in combination as long as it does not exist. that time,
The amount of the aliphatic tetracarboxylic acid dianhydride is preferably 50 mol% or less in the total tetracarboxylic acid dianhydride.

【0012】さらに、芳香族テトラカルボン酸二無水物
を必須成分とするポリアミド酸において、アミン成分と
して下記の化合物を含む場合に液晶配向膜として特に優
れた特性を示す。
Further, in a polyamic acid containing an aromatic tetracarboxylic dianhydride as an essential component, when the following compounds are contained as an amine component, particularly excellent properties are exhibited as a liquid crystal alignment film.

【0013】[0013]

【化6】 [Chemical 6]

【0014】脂肪族テトラカルボン酸二無水物を必須成
分とするポリアミド酸と、芳香族テトラカルボン酸二無
水物を必須成分とするポリアミド酸構成原料におけるア
ミン成分としては、例えば、パラフェニレンジアミン、
メタフェニレンジアミン、4,4'−ジアミノジフェニル
メタン、3,3'−ジアミノジフェニルメタン、4,4'−
ジアミノジフェニルエーテル、4,4'−ジアミノジフェ
ニルスルホン、4,4'−ジアミノジフェニルスルフィ
ド、2,2−ビス(4−(4−アミノフェノキシ)フェ
ニル)プロパン、2,2−ビス(4−(4−アミノフェ
ノキシ)フェニル)ヘキサフルオロプロパン、4,4'−
ジアミノベンゾアニリド、ビス(4−(4−アミノフェ
ノキシ)フェニル)ヘキサフルオロプロパン、3,3'−
ジメトキシ−4,4'−ジアミノビフェニル、3,3'−ジ
アミノベンゾフェノン、3,4'−ジアミノベンゾフェノ
ン、4,4'−ジアミノベンゾフェノン、2,4−ジアミ
ノトルエンなどの芳香族化合物、または4,4'−ジアミ
ノジシクロヘキシルメタン、1,4−ジアミノシクロヘ
キサンなどの脂肪族化合物が挙げられ、これらは1種ま
たは2種以上併用して使用することができる。
The polyamic acid containing an aliphatic tetracarboxylic acid dianhydride as an essential component and the amine component in the polyamic acid constituting raw material containing an aromatic tetracarboxylic acid dianhydride as an essential component include, for example, paraphenylenediamine,
Metaphenylenediamine, 4,4'-diaminodiphenylmethane, 3,3'-diaminodiphenylmethane, 4,4'-
Diaminodiphenyl ether, 4,4'-diaminodiphenyl sulfone, 4,4'-diaminodiphenyl sulfide, 2,2-bis (4- (4-aminophenoxy) phenyl) propane, 2,2-bis (4- (4- Aminophenoxy) phenyl) hexafluoropropane, 4,4'-
Diaminobenzoanilide, bis (4- (4-aminophenoxy) phenyl) hexafluoropropane, 3,3'-
Aromatic compounds such as dimethoxy-4,4'-diaminobiphenyl, 3,3'-diaminobenzophenone, 3,4'-diaminobenzophenone, 4,4'-diaminobenzophenone, 2,4-diaminotoluene, or 4,4 Examples thereof include aliphatic compounds such as'-diaminodicyclohexylmethane and 1,4-diaminocyclohexane, which can be used alone or in combination of two or more.

【0015】本発明において使用される脂肪族テトラカ
ルボン酸二無水物を必須成分とするポリアミド酸と、芳
香族テトラカルボン酸二無水物を必須成分とするポリア
ミド酸の合成方法についても何ら限定されるものではな
い。一般的な合成方法としては、反応溶媒として、N−
メチル−2−ピロリドン(NMP)、N,N−ジメチル
ホルムアミド(DMF)、N,N−ジアミノアセトアミ
ド(DMAc)、ジメチルスルホキシド(DMSO)、
γ−ブチロラクトン(GBL)、ジグライム、テトラグ
ライム、エチルカルビトール、フェノキシエタノール、
ブチルセロソルブ、エチルセロソルブ、m−クレゾー
ル、キシレン、トルエン等を単独、あるいは2種以上の
混合系で使用し、ジアミン化合物とテトラカルボン酸二
無水物を0℃から100℃の温度で反応する。反応溶液
の濃度は1から40%の間にするのが好ましい。
The method for synthesizing the polyamic acid containing an aliphatic tetracarboxylic dianhydride as an essential component and the polyamic acid containing an aromatic tetracarboxylic dianhydride as an essential component used in the present invention is also not limited. Not a thing. As a general synthetic method, N-
Methyl-2-pyrrolidone (NMP), N, N-dimethylformamide (DMF), N, N-diaminoacetamide (DMAc), dimethyl sulfoxide (DMSO),
γ-butyrolactone (GBL), diglyme, tetraglyme, ethylcarbitol, phenoxyethanol,
Butyl cellosolve, ethyl cellosolve, m-cresol, xylene, toluene and the like are used alone or in a mixture of two or more kinds, and a diamine compound and a tetracarboxylic acid dianhydride are reacted at a temperature of 0 ° C to 100 ° C. The concentration of the reaction solution is preferably between 1 and 40%.

【0016】液晶配向剤を調製するにあたっては、上述
の様な方法により得られた脂肪族テトラカルボン酸二無
水物を必須成分とするポリアミド酸と、芳香族テトラカ
ルボン酸二無水物を必須成分とするポリアミド酸を液晶
配向膜としての要求特性に応じて所定の割合で混合する
が、その際、液晶配向特性、電気光学特性の観点から、
脂肪族テトラカルボン酸二無水物を必須成分とするポリ
アミド酸が、全ポリアミド酸のうち1〜99.5重量%
となるようにすることが好ましい。又、その際、塗膜の
均一性等を得るためにさらに溶媒を添加することができ
る。
In preparing a liquid crystal aligning agent, a polyamic acid containing an aliphatic tetracarboxylic acid dianhydride obtained by the above-mentioned method as an essential component and an aromatic tetracarboxylic acid dianhydride as an essential component are used. The polyamic acid to be mixed is mixed in a predetermined ratio according to the required characteristics as a liquid crystal alignment film, in that case, from the viewpoint of liquid crystal alignment characteristics, electro-optical characteristics,
Polyamic acid containing aliphatic tetracarboxylic acid dianhydride as an essential component is 1 to 99.5% by weight of the total polyamic acid.
It is preferable that Further, in that case, a solvent may be further added in order to obtain uniformity of the coating film.

【0017】本発明の液晶配向剤を用いて得られる液晶
配向膜は、例えば次の様な方法によって形成することが
できる。
The liquid crystal alignment film obtained by using the liquid crystal alignment agent of the present invention can be formed, for example, by the following method.

【0018】まず透明導電膜が設けられた基板の透明導
電膜側に本発明の液晶配向剤をロールコーター法、スピ
ンナー法、印刷法等の方法で塗布し、100℃から30
0℃の温度で焼成し塗膜を形成させる。その後、ラビン
グ処理を行なうことにより液晶配向膜となる。
First, the liquid crystal aligning agent of the present invention is applied to the transparent conductive film side of a substrate provided with a transparent conductive film by a method such as a roll coater method, a spinner method, or a printing method, and the temperature is from 100 ° C. to 30 ° C.
It is baked at a temperature of 0 ° C. to form a coating film. Then, a rubbing process is performed to form a liquid crystal alignment film.

【0019】本発明の液晶配向剤を用いることにより、
液晶表示素子製造プロセス上においては、塗膜の均一性
が良好で、かつ基板に対する密着性が優れていることか
ら、ラビング等の工程でも剥がれ等のトラブルが全くな
い。また、液晶表示素子の特性面では、液晶の配向性や
プレチルト角の安定性が芳香族テトラカルボン酸を必須
成分とするポリアミド酸が有する良好な特性を反映し、
素子の電気光学特性においては脂肪族テトラカルボン酸
を必須成分とするポリアミド酸が有する良好な特性を反
映することから、本発明の液晶配向剤は、従来にない優
れた液晶配向膜を提供するものである。
By using the liquid crystal aligning agent of the present invention,
In the liquid crystal display device manufacturing process, since the coating film has good uniformity and excellent adhesion to the substrate, there is no trouble such as peeling even in the step of rubbing or the like. Further, in terms of the characteristics of the liquid crystal display device, the orientation of the liquid crystal and the stability of the pretilt angle reflect the good characteristics of the polyamic acid having an aromatic tetracarboxylic acid as an essential component,
In the electro-optical characteristics of the device, since the liquid crystal aligning agent of the present invention reflects the good characteristics of the polyamic acid having an aliphatic tetracarboxylic acid as an essential component, the liquid crystal aligning agent of the present invention provides an excellent liquid crystal aligning film which has never been obtained. Is.

【0020】[0020]

【実施例】以下に本発明の実施例を詳細に説明するが、
本発明はこれらの実施例によって何ら限定されるもので
はない。
EXAMPLES Examples of the present invention will be described in detail below.
The invention is in no way limited by these examples.

【0021】合成例1 温度計、攪拌機、原料仕込口および窒素ガス導入口を備
えた300ml四つ口セパラブルフラスコに4,4'−ジア
ミノジフェニルメタン19.83g、脱水NMP150
gを入れ、乾燥窒素気流下攪拌した。反応系の温度を2
0℃に保ちながら、ブタンテトラカルボン酸二無水物1
9.81gを添加し5時間攪拌反応し淡黄色の粘ちょう
な溶液を得た。
Synthesis Example 1 19,83 g of 4,4'-diaminodiphenylmethane and dehydrated NMP150 were placed in a 300 ml four-neck separable flask equipped with a thermometer, a stirrer, a raw material charging port and a nitrogen gas inlet.
g, and stirred under a stream of dry nitrogen. The temperature of the reaction system is 2
While maintaining at 0 ° C, butanetetracarboxylic dianhydride 1
9.81 g was added, and the mixture was reacted with stirring for 5 hours to obtain a pale yellow viscous solution.

【0022】合成例2 合成例1と同様な装置、反応方法により原料として4,
4'−ジアミノジフェニルメタン19.83g、5−
(2,5−ジオキソテトラヒドロ−3−フラニル)−3
−メチル−3−シクロヘキセン−1,2−ジカルボン酸
二無水物26.42gを使用し淡黄色の粘ちょうな溶液を
得た。
Synthesis Example 2 Using the same equipment and reaction method as in Synthesis Example 1, 4
4'-diaminodiphenylmethane 19.83 g, 5-
(2,5-dioxotetrahydro-3-furanyl) -3
A pale yellow viscous solution was obtained using 26.42 g of -methyl-3-cyclohexene-1,2-dicarboxylic acid dianhydride.

【0023】合成例3 合成例1と同様な装置、反応方法により原料としてp−
フェニレンジアミン10.81g、ブタンテトラカルボ
ン酸二無水物19.81gを使用し淡黄色の粘ちょうな
溶液を得た。
Synthesis Example 3 p- was used as a raw material by the same apparatus and reaction method as in Synthesis Example 1.
A pale yellow viscous solution was obtained using 10.81 g of phenylenediamine and 19.81 g of butanetetracarboxylic dianhydride.

【0024】合成例4 合成例1と同様な装置、反応方法により原料としてp−
フェニレンジアミン10.81g、5−(2,5−ジオキ
ソテトラヒドロ−3−フラニル)−3−メチル−3−シ
クロヘキセン−1,2−ジカルボン酸二無水物26.42
gを使用し淡黄色の粘ちょうな溶液を得た。
Synthesis Example 4 p- was used as a raw material by the same apparatus and reaction method as in Synthesis Example 1.
Phenylenediamine 10.81 g, 5- (2,5-dioxotetrahydro-3-furanyl) -3-methyl-3-cyclohexene-1,2-dicarboxylic acid dianhydride 26.42
g to give a pale yellow viscous solution.

【0025】合成例5 温度計、攪拌機、原料仕込口および窒素ガス導入口を備
えた500ml四つ口セパラブルフラスコにピロメリット
酸二無水物21.81g、脱水NMP250gを入れ、
乾燥窒素気流下攪拌した。反応系の温度を20℃に保ち
ながら、ビスアミノプロピルテトラメチルジシロキサン
9.94gを添加し、その後さらに2,2−ビス(4−
(4−アミノフェノキシ)フェニル)プロパン24.6
3gを加えて5時間攪拌反応し淡黄色の粘ちょうな溶液
を得た。
Synthesis Example 5 21.81 g of pyromellitic dianhydride and 250 g of dehydrated NMP were placed in a 500 ml four-neck separable flask equipped with a thermometer, a stirrer, a raw material inlet and a nitrogen gas inlet.
The mixture was stirred under a stream of dry nitrogen. While maintaining the temperature of the reaction system at 20 ° C, 9.94 g of bisaminopropyltetramethyldisiloxane was added, and then 2,2-bis (4-
(4-Aminophenoxy) phenyl) propane 24.6
3 g was added and reacted with stirring for 5 hours to obtain a pale yellow viscous solution.

【0026】合成例6 合成例5と同様な装置、反応方法により原料としてピロ
メリット酸二無水物21.81g、ビスアミノプロピル
テトラメチルジシロキサン9.94g、4,4'−ジアミ
ノジフェニルエーテル12.01gを使用し淡黄色の粘
ちょうな溶液を得た。
Synthesis Example 6 21.81 g of pyromellitic dianhydride, 9.94 g of bisaminopropyltetramethyldisiloxane, and 12.01 g of 4,4'-diaminodiphenyl ether were used as raw materials by the same apparatus and reaction method as in Synthesis Example 5. Was used to obtain a pale yellow viscous solution.

【0027】実施例1 合成例1で得られた脂肪族テトラカルボン酸を必須成分
とするポリアミド酸と合成例5で得られた芳香族テトラ
カルボン酸を必須成分とするポリアミド酸を樹脂分の重
量比で70対30の割合になるように混合し、さらに、
全樹脂分濃度が6%になるようにNMPを添加した後、
ポアサイズ0.5ミクロンのメンブランフィルターで濾
過して液晶配向剤とした。この液晶配向剤を透明電極付
きガラス基板の透明電極面にスピンナーにより塗布し、
200℃で1時間焼成し、約600オングストロームの
塗膜を形成させた。引き続き、塗膜面をラビングマシー
ンによりラビングし、2枚の基板を5μmのギャップで
張り合わせ、液晶(メルク社製、ZLI−5081)を
注入してTN液晶セルを作成した。液晶の配向性を顕微
鏡により評価したところ全面にわたり均一であり、12
0℃で500時間処理した後も全く液晶の配向は乱れて
いなかった。セルの電気特性として電圧保持率を評価し
たところ98.5%であり、120℃で500時間処理
した後でも97.6%であった。さらに、アンチパラレ
ルセルによるプレチルト角の評価では4.2度、120
℃で50時間処理した後では5.1度であった。
Example 1 Polyamic acid containing the aliphatic tetracarboxylic acid obtained in Synthetic Example 1 as an essential component and polyamic acid containing the aromatic tetracarboxylic acid obtained in Synthetic Example 5 as an essential component were weighted as resin components. Mix so that the ratio becomes 70:30, and further,
After adding NMP so that the total resin concentration becomes 6%,
A liquid crystal aligning agent was obtained by filtering with a membrane filter having a pore size of 0.5 micron. This liquid crystal aligning agent is applied to the transparent electrode surface of the glass substrate with a transparent electrode by a spinner,
It was baked at 200 ° C. for 1 hour to form a coating film having a thickness of about 600 Å. Subsequently, the coated surface was rubbed with a rubbing machine, two substrates were bonded together with a gap of 5 μm, and liquid crystal (ZLI-5081 manufactured by Merck & Co., Inc.) was injected to prepare a TN liquid crystal cell. When the orientation of the liquid crystal was evaluated by a microscope, it was uniform over the entire surface.
The alignment of the liquid crystal was not disturbed at all even after the treatment at 0 ° C. for 500 hours. When the voltage holding ratio was evaluated as an electrical property of the cell, it was 98.5%, and it was 97.6% even after the treatment at 120 ° C. for 500 hours. Furthermore, the evaluation of the pretilt angle by the anti-parallel cell was 4.2 degrees, 120
It was 5.1 degrees after the treatment at 50 ° C. for 50 hours.

【0028】実施例2−5 合成例1から4で得られた脂肪族テトラカルボン酸を必
須成分とするポリアミド酸と、合成例5、6で得られた
芳香族族テトラカルボン酸を必須成分とするポリアミド
酸とを用いて、実施例1と同様に液晶セルを作成し評価
を行なった。その結果を表1に示す。
Example 2-5 Polyamic acid containing aliphatic tetracarboxylic acid obtained in Synthesis Examples 1 to 4 as an essential component and aromatic tetracarboxylic acid obtained in Synthesis Examples 5 and 6 as an essential component A liquid crystal cell was prepared and evaluated in the same manner as in Example 1 using the polyamic acid. The results are shown in Table 1.

【0029】[0029]

【表1】 [Table 1]

【0030】比較例1 合成例2で得た脂肪族テトラカルボン酸を必須成分とす
るポリアミド酸のみを用いて実施例1と同様に液晶セル
を作成したところ、液晶の配向均一性が悪く、偏光板で
セルを挟んでみたところ、明暗のコントラストにムラが
生じていた。
Comparative Example 1 A liquid crystal cell was prepared in the same manner as in Example 1 using only the polyamic acid containing the aliphatic tetracarboxylic acid obtained in Synthesis Example 2 as an essential component. When the cell was sandwiched between the plates, the contrast of light and dark was uneven.

【0031】比較例2 合成例5で得た芳香族テトラカルボン酸を必須成分とす
るポリアミド酸のみを用いて実施例1と同様に液晶セル
を作成したところ、液晶の配向性は全面にわたり均一で
あり、120℃で500時間処理した後も全く液晶の配
向は乱れていなかった。しかし、電圧保持率を評価した
ところ熱処理前は98.6%と高い値を示したが、12
0℃で5時間処理した後は94.5%に低下していた。
Comparative Example 2 A liquid crystal cell was prepared in the same manner as in Example 1 using only the polyamic acid containing the aromatic tetracarboxylic acid obtained in Synthesis Example 5 as an essential component. The alignment of the liquid crystal was not disturbed at all even after the treatment at 120 ° C. for 500 hours. However, when the voltage holding ratio was evaluated, it showed a high value of 98.6% before the heat treatment.
After treatment for 5 hours at 0 ° C., it had dropped to 94.5%.

【発明の効果】本発明の液晶配向剤は、液晶配向膜とし
て優れた特性を有していることから、種々の液晶表示素
子に好適に用いられる。
INDUSTRIAL APPLICABILITY The liquid crystal aligning agent of the present invention has excellent characteristics as a liquid crystal aligning film, and is therefore suitably used for various liquid crystal display devices.

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 脂肪族テトラカルボン酸二無水物を必須
成分とするポリアミド酸と、芳香族テトラカルボン酸二
無水物を必須成分とするポリアミド酸を含有することを
特徴とする液晶配向剤。
1. A liquid crystal aligning agent comprising a polyamic acid containing an aliphatic tetracarboxylic dianhydride as an essential component and a polyamic acid containing an aromatic tetracarboxylic dianhydride as an essential component.
【請求項2】 脂肪族テトラカルボン酸二無水物を必須
成分とするポリアミド酸において、脂肪族テトラカルボ
ン酸二無水物が下記で示される化合物から選ばれること
を特徴とする請求項1記載の液晶配向剤。 【化1】
2. The liquid crystal according to claim 1, wherein in the polyamic acid containing an aliphatic tetracarboxylic dianhydride as an essential component, the aliphatic tetracarboxylic dianhydride is selected from the compounds shown below. Alignment agent. [Chemical 1]
【請求項3】 芳香族テトラカルボン酸二無水物を必須
成分とするポリアミド酸において、芳香族テトラカルボ
ン酸二無水物が下記で示される化合物から選ばれること
を特徴とする請求項1記載の液晶配向剤。 【化2】
3. The polyamic acid containing an aromatic tetracarboxylic dianhydride as an essential component, wherein the aromatic tetracarboxylic dianhydride is selected from the compounds shown below. Alignment agent. [Chemical 2]
【請求項4】 芳香族テトラカルボン酸二無水物を必須
成分とするポリアミド酸において、アミン成分として下
記の化合物を含むことを特徴とする請求項1記載の液晶
配向剤。 【化3】
4. The liquid crystal aligning agent according to claim 1, wherein the polyamic acid containing an aromatic tetracarboxylic acid dianhydride as an essential component contains the following compound as an amine component. [Chemical 3]
JP26874993A 1993-10-27 1993-10-27 Liquid crystal alignment agent Expired - Fee Related JP2834652B2 (en)

Priority Applications (1)

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JP26874993A JP2834652B2 (en) 1993-10-27 1993-10-27 Liquid crystal alignment agent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26874993A JP2834652B2 (en) 1993-10-27 1993-10-27 Liquid crystal alignment agent

Publications (2)

Publication Number Publication Date
JPH07120768A true JPH07120768A (en) 1995-05-12
JP2834652B2 JP2834652B2 (en) 1998-12-09

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05119322A (en) * 1991-10-29 1993-05-18 Matsushita Electric Ind Co Ltd Liquid crystal oriented film
JPH10168189A (en) * 1996-12-10 1998-06-23 Sumitomo Bakelite Co Ltd Orientating agent for liquid crystal
US6316574B1 (en) 1997-12-29 2001-11-13 Chisso Corporation Polyamic acid composition, liquid crystal aligning film, and liquid crystal display element
WO2002033481A1 (en) * 2000-10-16 2002-04-25 Nissan Chemical Industries, Ltd. Aligning agent for liquid crystal for in-plane switching, liquid-crystal alignment film, and liquid-crystal display element
US6620339B1 (en) 1997-12-29 2003-09-16 Chisso Corporation Polyamic acid composition, liquid crystal aligning film, and liquid crystal display element
US6946169B1 (en) 1997-12-29 2005-09-20 Chisso Corporation Polyamic acid composition, liquid crystal aligning film, and liquid crystal display element

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05119322A (en) * 1991-10-29 1993-05-18 Matsushita Electric Ind Co Ltd Liquid crystal oriented film
JPH10168189A (en) * 1996-12-10 1998-06-23 Sumitomo Bakelite Co Ltd Orientating agent for liquid crystal
US6316574B1 (en) 1997-12-29 2001-11-13 Chisso Corporation Polyamic acid composition, liquid crystal aligning film, and liquid crystal display element
US6620339B1 (en) 1997-12-29 2003-09-16 Chisso Corporation Polyamic acid composition, liquid crystal aligning film, and liquid crystal display element
US6946169B1 (en) 1997-12-29 2005-09-20 Chisso Corporation Polyamic acid composition, liquid crystal aligning film, and liquid crystal display element
WO2002033481A1 (en) * 2000-10-16 2002-04-25 Nissan Chemical Industries, Ltd. Aligning agent for liquid crystal for in-plane switching, liquid-crystal alignment film, and liquid-crystal display element

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