JP4069380B2 - Aqueous liquid cleaning composition for liquid crystal panel - Google Patents
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Description
【0001】
【発明の属する技術分野】
本発明は、液晶パネル用水系液体洗浄剤組成物に関する。
【0002】
【従来の技術】
液晶パネルは、消費電力が少ないという利点を有する上、近年高コントラスト化等の技術改良が進んだ結果、多様な画像表示が可能となり、コンピュータ端末表示部、テレビのディスプレイ、携帯電話等の小型パネルなどの幅広い分野に用いられ、その用途が拡大している。
【0003】
この液晶パネルは、10μm以下の所定間隔離して対向・保持させた2枚のガラス基板の周囲を、内部に中空部が形成されるように接着剤で貼り合わせた後、上述の中空部内に液晶を封入して製造される。
この場合、上記2枚のガラス基板内部には、透明導電膜で構成された文字、画像表示用電極が設けられ、この電極に制御用電気信号を印加することで、文字、画像が表示される構成となっている。
【0004】
上記液晶パネルを製造する際、2枚のガラス基板の接着部の外側にミクロンオーダーの微小ギャップが生じ、空隙部が生じることは避けられない。このため、2枚のガラス基板で形成された中空部に液晶材料を注入する際、毛細管現象により空隙部にも液晶材料が侵入してしまう。
しかし、この空隙部には透明電極に電気信号を印加するための電極端子が各々絶縁を保って高密度に形成されていることから、空隙部に侵入した液晶材料をそのまま放置しておくと、この液晶材料が大気中の汚染物質を溶解し、その結果、絶縁不良を起こす場合がある。このため、空隙部に侵入した液晶材料を洗浄、除去する必要がある。
【0005】
ところが、空隙部の間隔は10μm以下と非常に狭いため、侵入した液晶材料を完全に除去するためには、用いる洗浄剤に高度な洗浄能力が必要とされる。
このような液晶パネルの洗浄剤としては、従来、フロン、トリクロロエタン、トリクロロエチレン、テトラクロロエチレン、メチレンクロライド等に代表される塩素系溶剤が好適に用いられてきたが、世界的な環境対策の一環として、それらの使用規制が行われるようになっている。
【0006】
これに伴い、代替洗浄剤開発の要求が高まった結果、上記塩素系溶剤を用いない新たな洗浄剤として、炭化水素系溶剤や、炭化水素系溶剤とグリコールエーテルとの混合組成物(特許文献1:特開平10−25495公報)等が報告されているが、これらは引火性が高く、取り扱いが困難なものである。
【0007】
ところで、近年における液晶パネルの高密度化技術の進展に伴い、上述した空隙部の間隔が一層狭くなっている一方で、生産効率の向上が要求されていることから、より短時間で洗浄可能な高洗浄能力を有する洗浄剤が求められるようになっている。
さらに、液晶パネル生産の歩留まりの向上も要求されていることから、空隙部に侵入した液晶材料のみならず、電極端子表面上の異物に対する洗浄力も求められるようになってきている。
【0008】
すなわち、液晶パネル製造過程において、マザーガラスから必要に応じて適切な大きさに切断されたガラス基材が用いられるが、この切断時に、ガラスの切粉(通称カレット)が多量に発生する。このカレットが液晶パネル電極端子表面に付着すると、その後の実装工程に大きな支障を与えるため、これを洗浄により除去する必要が生じる。
【0009】
このカレット等の表面異物は、液晶パネルに分子間力で付着するだけでなく、液晶材料等をバインダーとして強固に付着する場合もあり、これを除去する洗浄剤には、より高度な洗浄能力が必要とされる。
このカレット用洗浄剤としては、特許文献2(特開平5−271699号公報)、特許文献3(特開平7−305093号公報)、特許文献4(特開2001−181699号公報)等で開示されたものがある。しかし、いずれもアルカリ系洗浄剤であり、液晶パネルへのダメージが懸念される上、液晶材料の除去には効果がほとんどないことから、液晶材料をバインダーとして固着したカレットを除去することは難しい。
【0010】
このように、現在までのところ、環境負荷および毒性が小さく、引火性の低い洗浄剤であり、空隙部に侵入した液晶材料およびカレット等の液晶パネル電極端子表面異物の両者を洗浄、除去し得る洗浄能力に優れた液晶パネル用洗浄剤は知られていない。
【0011】
【特許文献1】
特開平10−25495公報
【特許文献2】
特開平5−271699号公報
【特許文献3】
特開平7−305093号公報
【特許文献4】
特開2001−181699号公報
【0012】
【発明が解決しようとする課題】
本発明は、このような事情に鑑みてなされたものであり、液晶パネルの空隙部に侵入した液晶材料の除去性に優れるとともに、カレット等の液晶パネル電極端子表面の異物除去性にも優れ、しかも、環境負荷および毒性が小さく、引火性の低い液晶パネル用水系液体洗浄剤組成物を提供することを目的とする。
【0013】
【課題を解決するための手段および発明の実施の形態】
本発明者らは、上記目的を達成するために鋭意検討を行った結果、分岐鎖を有する特定の非イオン性界面活性剤、特定のグリコールエーテル化合物、炭化水素を含有する洗浄剤組成物が、液晶パネルの空隙部の液晶材料に対して高い洗浄力を有し、かつ、カレット等の表面に付着する異物を高い浸透力をもって除去し得ることを見いだし、本発明を完成した。
【0014】
すなわち、本発明は、
1.下記(A),(B),(C),(D)成分および所定量の水を含むことを特徴とする液晶パネル用水系液体洗浄剤組成物、
(A)下記一般式(1)で示される化合物;5〜60質量%
RR1CH(CH2)nO(AO)mH・・・(1)
(式中、RおよびR1は炭素数1〜8、かつ、n=1のときは、RおよびR1の合計炭素数が9以下、n=2のときは、RおよびR1の合計炭素数が8以下となるアルキル基を、nは1〜2の数を、AOは炭素数2〜4のオキシアルキレン基を、mは2〜10の数を示す。)
(B)下記一般式(2)で示される化合物;1〜25質量%
RR1CH(CH2)nO(AO)jH・・・(2)
(式中、R、R1、nおよびAOは上記と同じ。jは12〜30の数を示す。)
(C)下記一般式(3)で示される化合物;1〜20質量%
R2O(AO)kR3・・・(3)
(式中、R2は炭素数1〜6のアルキル基またはフェニル基もしくはベンジル基を、R3は水素原子または炭素数1〜6のアルキル基を、kは1〜5の数を示す。AOは上記と同じ。)
(D)炭素数8〜20の炭化水素化合物;1〜10質量%
を提供する。
【0015】
以下、本発明についてさらに詳しく説明する。
本発明の液晶パネル用水系液体洗浄剤組成物は、上述のように、組成物中に、(A)成分を5〜60質量%、(B)成分を1〜25質量%、(C)成分を1〜20質量%、(D)成分を1〜10質量%、および水を所定量含むものである。
【0016】
ここで、(A)成分の配合量が5質量%未満では、浸透力が低下してカレット等の表面異物の洗浄効果が悪化する可能性が高く、60質量%を超えると、すすぎ性が著しく低下する可能性が高い。(B)成分の配合量が1質量%未満では、液安定性が低下して曇点が低くなる可能性が高く、25質量%を超えると、低温での液安定性が低下する可能性が高い。より好ましい(B)成分の配合量は、5〜15質量%である。(C)成分の配合量が1質量%未満では、液晶材料の洗浄性が低下する可能性が高く、20質量%を超えると、液安定性が低下する可能性が高い。より好ましい(C)成分の配合量は、3〜15質量%である。(D)成分の配合量が1質量%未満では、液晶材料の洗浄性が著しく低下する可能性が高く、10質量%を超えると、曇点低下等、液安定性の低下を招く可能性が高い。より好ましい(D)成分の配合量は、1〜6質量%である。水の配合量は、特に限定されるものではないが、組成物に対して少なくとも10質量%以上配合して組成物の引火性の低減を図ることが望ましい。
【0017】
上記(A)成分は、下記一般式(1)で示される中鎖分岐第1級アルコールのアルキレンオキシド付加体である。
RR1CH(CH2)nO(AO)mH・・・(1)
(式中、RおよびR1は炭素数1〜8、かつ、n=1のときは、RおよびR1の合計炭素数が9以下、n=2のときは、RおよびR1の合計炭素数が8以下となるアルキル基を、nは1〜2の数を、AOは炭素数2〜4のオキシアルキレン基を、mは2〜10の数を示す。)
【0018】
ここで、上記RおよびR1としては、炭素数1〜8で、n=1のときは、RおよびR1の合計炭素数が9以下となるアルキル基、n=2のときは、RおよびR1の合計炭素数が8以下となるアルキル基であれば特に制限はなく、メチル、エチル、プロピル、ブチル、ペンチル、ヘキシル、オクチル、イソブチル、ターシャリーブチル、イソペンチル、イソヘキシル、イソオクチル等を用いることができる。
具体的な、中鎖分岐第1級アルコールとしては、2−エチルヘキサノール、2−エチルヘプタノール、2−エチルブタノール、3−エチルヘキサノール、3−エチルヘプタノール、3−エチルブタノール、2−メチルヘキサノール、2−メチルヘプタノール、2−メチルオクタノール、2−メチルノナノール、2−メチルデカノール等が挙げられるが、好ましくは2−エチルヘキサノール、2−メチルデカノールである。なお、合成アルコールである、例えば、ダイヤドール9、ダイヤドール11(三菱化学(株)製)は、上記分岐第1級アルコールを30〜50質量%含むので、これらの合成アルコールも好適に用いることができる。
【0019】
また、上記AOは炭素数2〜4のオキシアルキレンであり、オキシエチレン、オキシプロピレン、オキシブチレンを単独または混合して用いることができるが、オキシエチレン単独で、またはオキシエチレンおよびオキシプロピレンを混合して用いることが好ましい。
この場合、オキシアルキレンの付加モル数mは2〜10の数であり、好ましくは2〜8である。付加モル数が2未満の場合は液安定性が不安定になる虞があり、一方、10を超えると洗浄性の低下、特に、カレットの洗浄性の低下を招く虞がある。
【0020】
上記(B)成分は、下記一般式(2)で示される中鎖分岐一級アルコールのアルキレンオキシド付加体である。
RR1CH(CH2)nO(AO)jH・・・(2)
(式中、R、R1、nおよびAOは上記と同じ。jは12〜30の数を示す。)
この場合、R、R1、nおよびAOは上記一般式(1)で示される化合物と同様である。また、オキシアルキレンの付加モル数jは12〜30の数であり、好ましくは15〜20である。付加モル数がこの範囲からはずれると、液安定性が低下して曇点が低くなる虞がある。
【0021】
上記(C)成分は、下記一般式(3)で示される短鎖アルキル(アルケニル)−一価アルコールのアルキレンオキシド付加体、フェノールのアルキレンオキシド付加体、ベンジルアルコールのアルキレンオキシド付加体である。
R2O(AO)kR3・・・(3)
(式中、R2は炭素数1〜6のアルキル基またはフェニル基もしくはベンジル基を、R3は水素原子または炭素数1〜6のアルキル基を、kは1〜5の数を示す。AOは上記と同じ。)
【0022】
ここで、炭素数1〜6のアルキル基およびAOは、上記一般式(1)の化合物で説明したものと同様である。また、アルキレンオキシド付加モル数kは1〜5の数であり、好ましくは1〜3である。付加モル数がこの範囲からはずれると、液晶材料の洗浄性が低下する虞がある。
【0023】
上記(D)成分は、炭素数8〜20、好ましくは炭素数10〜14の炭化水素化合物、好ましくは、パラフィンまたはオレフィン系炭化水素化合物であり、例えば、n−オクタン、n−デカン、n−ドデカン、n−テトラデカン、n−ヘキサデカン、n−オクタデカン、イソオクタン、イソドデカン、イソオクタデカン、これらに対応する不飽和化合物等を用いることができる。
【0024】
以上で説明した本発明の各液晶パネル用水系液体洗浄剤組成物の製造方法としては、特に限定はなく、常法に従って各成分を配合して調製すればよい。この場合、各成分の配合順序は任意でよいが、水以外の成分を充分に混合した後、水を少量ずつ添加しながら均一な液体組成物となるように調製することが好ましい。
また、本発明の液晶パネル用水系液体洗浄剤組成物の使用にあたっては、組成物原液で用いることも、さらに水で希釈して水溶液として用いることもできるが、充分な洗浄力を発揮させるという点から、洗浄剤組成物原液で使用することが好ましい。
本発明の液晶パネル用水系液体洗浄剤組成物で液晶パネルを洗浄する際には、液晶パネルに液晶を充填した後、これを本発明の洗浄剤組成物に投入し、浸漬洗浄、超音波洗浄等すればよい。
【0025】
なお、本発明の液晶パネル用水系液体洗浄剤組成物には、上記必須成分に加えて、その他の任意成分として、両性界面活性剤、洗浄ビルダー、ハイドロトロープ剤等を組成物に対して1〜30質量%配合し、曇点上昇、洗浄力および液安定性の向上等を図ることもできる。さらに、ベンゾトリアゾール、t−ブチル安息香酸塩等の防錆剤を組成物に対して0.1〜5質量%配合してもよい。
また、液安定性向上や洗浄力向上のために、PRTR法(化学物質管理促進法)の規制に触れない炭素数11以下の直鎖アルコールのアルキレンオキシド付加体を併用してもよい。
【0026】
以上述べたように、本発明の液晶パネル用水系液体洗浄剤組成物は、上述した(A)〜(D)成分を含んで構成されているから、液晶パネルの空隙部に侵入した液晶材料およびカレット等の表面付着物の両者の洗浄に対して優れた洗浄効果を発揮するものである上、引火性も低く、組成物の経時安定性にも優れている。
さらに、本発明では、炭素数12〜15のアルコールエチレンオキシド付加体を用いていないため、環境負荷が少なく、しかも、PRTR法(化学物質管理促進法)に規定される届出の必要もない。
【0027】
【実施例】
以下、実施例および比較例を挙げて、本発明をより具体的に説明するが、本発明は、下記の実施例に限定されるものではない。
【0028】
[実施例1〜5]
下記表1に示される成分を混合して、液晶パネル用水系液体洗浄剤組成物を調製した。この場合、水以外の成分を充分に混合した後、水を少量ずつ添加しながら均一な液体組成物となるようにした。
【0029】
【表1】
【0030】
[比較例1〜4]
下記表2に示される成分を混合して、液晶パネル用水系液体洗浄剤組成物を調製した。この場合、水以外の成分を充分に混合した後、水を少量ずつ添加しながら均一な液体組成物となるようにした。
【0031】
【表2】
【0032】
上記実施例1〜5および比較例1〜4で得られた各液晶パネル用水系液体洗浄剤組成物について、代表的な液晶パネルを用い、洗浄力、すすぎ性、液安定性を評価した。結果を表3に示した。
なお、各項目は、以下の手法により測定、評価した。
【0033】
[1]洗浄力評価
適切な大きさにカットした5μmの空隙を有する液晶パネルの空隙部位に液晶材料を塗布し、80℃で8時間安定化させて被洗浄サンプルとした。なお、液晶パネルとしては、表面端子部にスペーサーより大きい(5μm以上の)カレットが100〜300個付着しているものを用いた。
上記実施例1〜5および比較例1〜4で調製した各液体洗浄剤組成物の原液中に、液晶パネルを浸漬し、超音波洗浄機(50kHz,200W、SC−20型、サン電子工業(株)製)を用いて50℃で3分間超音波洗浄を行った。
【0034】
続いて、被洗浄パネルを取り出し、50℃のイオン交換水中で1分間、洗浄時と同条件で超音波すすぎを行った後、105℃の恒温乾燥機で60分間乾燥させた。乾燥終了後、偏光顕微鏡(BX−60、オリンパス工業(株)製)を用いて空隙部を観察し、液晶材料の残留を以下の評価基準を用いて評価するとともに、端子表面に残留しているカレットの数をカウントし、以下の方法で除去率を算出した。
【0035】
(1)洗浄性評価1(液晶材料の残留)
◎:完全に洗浄された
○:ほとんど洗浄された
△:少し洗浄された
×:全く洗浄されない
(2)洗浄性評価2(カレットの除去率)
カレットの除去率(%)=(洗浄前のカレット数−洗浄後のカレット数)/(洗浄前のカレット数)×100
【0036】
[2]すすぎ性評価
上記と同様の液晶パネルを用い、エタノール中で充分洗浄して空隙部を完全に洗浄した。その後、上記各実施例および比較例の液体洗浄剤組成物中に液晶パネルを浸漬し、超音波照射により空隙部位に洗浄剤組成物を満たした。このようにして洗浄剤組成物が満たされた液晶パネルを、50℃のイオン交換水に3分間単純に浸漬した後、静かに引き上げ、105℃で60分間乾燥させた。乾燥終了後、顕微鏡(BX−60、オリンパス工業(株)製)を用いて空隙部の洗浄剤組成物の残留性を以下の評価基準に従って評価した。
◎:完全にすすがれて洗浄剤の残留がなかった
○:ほとんどすすがれて洗浄剤の残留がほぼなかった
△:少しすすがれて洗浄剤が多少残留した
×:全くすすがれずに洗浄剤が多量に残留した
【0037】
[3]液安定性
一般に、この種の洗浄剤組成物は、洗浄効率を高めるために加温して用いられることが多く、高温領域での均一性が問題とされるので、高温領域での曇点を液安定性の指標とした。
上記各実施例1〜5および比較例1〜4で調製した液体洗浄剤組成物の原液における曇点を測定し、以下の基準により評価した。
◎:50℃以上
○:40℃以上50℃未満
△:30℃以上40℃未満
×:30℃未満または白濁/分離
【0038】
【表3】
【0039】
表3に示されるように、実施例1〜5で得られた各液晶パネル用水系液体洗浄剤組成物は、比較例1〜4と比べ、液晶材料およびカレット双方の洗浄性に優れるとともに、すすぎ性、液安定性に優れていることがわかる。
【0040】
【発明の効果】
以上述べたように、本発明によれば、液晶パネルの空隙部に侵入した液晶材料の除去性に優れるとともに、カレット等の液晶パネル電極端子表面の異物除去性に優れる液晶パネル用水系液体洗浄剤組成物を提供することができる。しかも、この洗浄剤組成物は、環境負荷および毒性が小さく、引火性の低いものである上、炭素数12〜15のアルコールエチレンオキシド付加体等を用いていないため、PRTR法(化学物質管理促進法)に規定される届出の必要もない。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an aqueous liquid cleaning composition for liquid crystal panels.
[0002]
[Prior art]
Liquid crystal panels have the advantage of low power consumption, and as a result of technological improvements such as higher contrast in recent years, a variety of image displays are possible. Small panels such as computer terminal displays, TV displays, mobile phones, etc. It is used in a wide range of fields, and its uses are expanding.
[0003]
In this liquid crystal panel, the periphery of two glass substrates that are opposed to and held at a predetermined distance of 10 μm or less is bonded with an adhesive so that a hollow portion is formed inside, and then the liquid crystal is placed in the hollow portion. Is manufactured.
In this case, characters and image display electrodes made of a transparent conductive film are provided in the two glass substrates, and characters and images are displayed by applying a control electrical signal to these electrodes. It has a configuration.
[0004]
When manufacturing the above-mentioned liquid crystal panel, it is inevitable that a minute gap of micron order is generated outside the bonded portion of the two glass substrates, and a void portion is generated. For this reason, when the liquid crystal material is injected into the hollow portion formed by the two glass substrates, the liquid crystal material enters the gap portion by capillary action.
However, since the electrode terminals for applying an electrical signal to the transparent electrode are formed at a high density while maintaining insulation in this gap, if the liquid crystal material that has entered the gap is left as it is, This liquid crystal material can dissolve pollutants in the atmosphere, resulting in poor insulation. For this reason, it is necessary to wash and remove the liquid crystal material that has entered the gap.
[0005]
However, since the space between the gaps is as narrow as 10 μm or less, a high cleaning ability is required for the cleaning agent used in order to completely remove the invading liquid crystal material.
Conventionally, chlorinated solvents such as CFC, trichloroethane, trichloroethylene, tetrachloroethylene, and methylene chloride have been suitably used as cleaning agents for such liquid crystal panels. However, as part of global environmental measures, The regulation of the use of is going to be performed.
[0006]
Accordingly, as a result of increasing demands for development of alternative cleaning agents, hydrocarbon-based solvents and mixed compositions of hydrocarbon-based solvents and glycol ethers (Patent Document 1) are proposed as new cleaning agents that do not use the above-mentioned chlorine-based solvents. However, these are highly flammable and difficult to handle.
[0007]
By the way, with the recent development of high-density liquid crystal panel technology, the gaps described above are further narrowed, while improvement in production efficiency is required, so that cleaning can be performed in a shorter time. A cleaning agent having a high cleaning ability has been demanded.
Furthermore, since the improvement in the yield of liquid crystal panel production is also required, not only the liquid crystal material that has entered the gap, but also the ability to clean foreign matter on the electrode terminal surface has been demanded.
[0008]
That is, in the liquid crystal panel manufacturing process, a glass substrate cut from mother glass to an appropriate size as needed is used, but a large amount of glass chips (commonly called cullet) is generated during the cutting. If this cullet adheres to the surface of the liquid crystal panel electrode terminal, it causes a great hindrance in the subsequent mounting process, and thus it is necessary to remove it by washing.
[0009]
The surface foreign matter such as cullet is not only adhered to the liquid crystal panel by intermolecular force, but also may be firmly adhered using a liquid crystal material or the like as a binder, and the cleaning agent for removing this has a higher cleaning ability. Needed.
This cullet cleaning agent is disclosed in Patent Document 2 (JP-A-5-271699), Patent Document 3 (JP-A-7-305093), Patent Document 4 (JP-A-2001-181699), and the like. There is something. However, both are alkaline cleaning agents, and there is concern about damage to the liquid crystal panel, and since there is almost no effect in removing the liquid crystal material, it is difficult to remove the cullet with the liquid crystal material as a binder.
[0010]
Thus, so far, it is a cleaning agent with low environmental impact and toxicity and low flammability, and can clean and remove both liquid crystal material and liquid crystal panel electrode terminal surface foreign matter such as cullet that have entered the gap. There is no known liquid crystal panel cleaning agent with excellent cleaning ability.
[0011]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-25495 [Patent Document 2]
JP-A-5-271699 [Patent Document 3]
JP 7-305093 A [Patent Document 4]
JP 2001-181699 A
[Problems to be solved by the invention]
The present invention has been made in view of such circumstances, and is excellent in the removability of the liquid crystal material that has entered the voids of the liquid crystal panel, and also excellent in the removal of foreign matter on the surface of the liquid crystal panel electrode terminals such as cullet, And it aims at providing the aqueous | water-based liquid cleaning composition for liquid crystal panels with a small environmental impact and toxicity, and low flammability.
[0013]
Means for Solving the Problem and Embodiment of the Invention
As a result of diligent studies to achieve the above object, the present inventors have found that a specific nonionic surfactant having a branched chain, a specific glycol ether compound, and a detergent composition containing a hydrocarbon, It has been found that the liquid crystal material in the gap of the liquid crystal panel has a high detergency and can remove foreign substances adhering to the surface such as cullet with high penetrating power.
[0014]
That is, the present invention
1. An aqueous liquid detergent composition for a liquid crystal panel comprising the following components (A), (B), (C), (D) and a predetermined amount of water;
(A) Compound represented by the following general formula (1); 5 to 60% by mass
RR 1 CH (CH 2 ) n O (AO) m H (1)
(In the formula, R and R 1 have 1 to 8 carbon atoms, and when n = 1, the total carbon number of R and R 1 is 9 or less, and when n = 2, the total carbon of R and R 1 An alkyl group having a number of 8 or less, n is a number from 1 to 2, AO is an oxyalkylene group having 2 to 4 carbon atoms, and m is a number from 2 to 10.
(B) Compound represented by the following general formula (2): 1 to 25% by mass
RR 1 CH (CH 2 ) n O (AO) j H (2)
(In the formula, R, R 1 , n and AO are the same as above. J represents a number of 12 to 30.)
(C) Compound represented by the following general formula (3): 1 to 20% by mass
R 2 O (AO) k R 3 (3)
(In the formula, R 2 represents an alkyl group having 1 to 6 carbon atoms, a phenyl group or a benzyl group, R 3 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and k represents a number of 1 to 5.) Is the same as above.)
(D) C8-20 hydrocarbon compound; 1-10% by mass
I will provide a.
[0015]
Hereinafter, the present invention will be described in more detail.
As described above, the aqueous liquid cleaning composition for a liquid crystal panel of the present invention contains 5 to 60% by mass of component (A), 1 to 25% by mass of component (B), and component (C) in the composition. 1 to 20% by mass, (D) component 1 to 10% by mass, and a predetermined amount of water.
[0016]
Here, when the blending amount of the component (A) is less than 5% by mass, there is a high possibility that the osmotic force is reduced and the cleaning effect of surface foreign matter such as cullet is deteriorated. There is a high possibility of decline. When the blending amount of the component (B) is less than 1% by mass, the liquid stability is likely to be lowered and the cloud point is lowered, and when it exceeds 25% by mass, the liquid stability at a low temperature may be lowered. high. The blending amount of the component (B) is more preferably 5 to 15% by mass. When the blending amount of the component (C) is less than 1% by mass, there is a high possibility that the detergency of the liquid crystal material is deteriorated. A more preferable blending amount of the component (C) is 3 to 15% by mass. When the blending amount of the component (D) is less than 1% by mass, there is a possibility that the detergency of the liquid crystal material is remarkably lowered. high. The blending amount of the component (D) is more preferably 1 to 6% by mass. The blending amount of water is not particularly limited, but it is desirable to blend at least 10% by mass or more with respect to the composition to reduce the flammability of the composition.
[0017]
The component (A) is an alkylene oxide adduct of a medium chain branched primary alcohol represented by the following general formula (1).
RR 1 CH (CH 2 ) n O (AO) m H (1)
(In the formula, R and R 1 have 1 to 8 carbon atoms, and when n = 1, the total carbon number of R and R 1 is 9 or less, and when n = 2, the total carbon of R and R 1 An alkyl group having a number of 8 or less, n is a number from 1 to 2, AO is an oxyalkylene group having 2 to 4 carbon atoms, and m is a number from 2 to 10.
[0018]
Here, as the R and R 1, 1 to 8 carbon atoms, when n = 1, the alkyl group and the total number of carbon atoms in R and R 1 is 9 or less, when n = 2 is, R and There is no particular limitation as long as the total carbon number of R 1 is 8 or less, and methyl, ethyl, propyl, butyl, pentyl, hexyl, octyl, isobutyl, tertiary butyl, isopentyl, isohexyl, isooctyl, etc. should be used. Can do.
Specific examples of the medium chain branched primary alcohol include 2-ethylhexanol, 2-ethylheptanol, 2-ethylbutanol, 3-ethylhexanol, 3-ethylheptanol, 3-ethylbutanol, 2-methylhexanol. 2-methylheptanol, 2-methyloctanol, 2-methylnonanol, 2-methyldecanol and the like are preferable, and 2-ethylhexanol and 2-methyldecanol are preferable. In addition, since it is a synthetic alcohol, for example, Diadol 9 and Diadol 11 (Mitsubishi Chemical Co., Ltd.) contain 30-50 mass% of the said branched primary alcohol, these synthetic alcohols should also be used suitably. Can do.
[0019]
AO is an oxyalkylene having 2 to 4 carbon atoms, and oxyethylene, oxypropylene, and oxybutylene can be used singly or in combination, but oxyethylene alone or oxyethylene and oxypropylene are mixed. Are preferably used.
In this case, the added mole number m of oxyalkylene is a number of 2 to 10, preferably 2 to 8. If the number of added moles is less than 2, the liquid stability may become unstable. On the other hand, if it exceeds 10, the washability may be lowered, particularly the cullet may be washed.
[0020]
The component (B) is an alkylene oxide adduct of a medium chain branched primary alcohol represented by the following general formula (2).
RR 1 CH (CH 2 ) n O (AO) j H (2)
(In the formula, R, R 1 , n and AO are the same as above. J represents a number of 12 to 30.)
In this case, R, R 1 , n and AO are the same as the compound represented by the general formula (1). Moreover, the added mole number j of oxyalkylene is a number of 12-30, Preferably it is 15-20. If the added mole number is out of this range, the liquid stability is lowered and the cloud point may be lowered.
[0021]
The component (C) is a short-chain alkyl (alkenyl) -monohydric alcohol alkylene oxide adduct, a phenol alkylene oxide adduct, or a benzyl alcohol alkylene oxide adduct represented by the following general formula (3).
R 2 O (AO) k R 3 (3)
(In the formula, R 2 represents an alkyl group having 1 to 6 carbon atoms, a phenyl group or a benzyl group, R 3 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and k represents a number of 1 to 5.) Is the same as above.)
[0022]
Here, the alkyl group having 1 to 6 carbon atoms and AO are the same as those described for the compound of the general formula (1). Moreover, the alkylene oxide addition mole number k is a number of 1-5, Preferably it is 1-3. If the added mole number is out of this range, the cleaning property of the liquid crystal material may deteriorate.
[0023]
The component (D) is a hydrocarbon compound having 8 to 20 carbon atoms, preferably 10 to 14 carbon atoms, preferably a paraffin or olefinic hydrocarbon compound. For example, n-octane, n-decane, n- Dodecane, n-tetradecane, n-hexadecane, n-octadecane, isooctane, isododecane, isooctadecane, unsaturated compounds corresponding to these, and the like can be used.
[0024]
The production method of the aqueous liquid cleaning composition for each liquid crystal panel of the present invention described above is not particularly limited, and may be prepared by blending each component according to a conventional method. In this case, the blending order of each component may be arbitrary, but after thoroughly mixing components other than water, it is preferable to prepare a uniform liquid composition while adding water little by little.
In addition, when using the aqueous liquid cleaning composition for liquid crystal panels of the present invention, it can be used as a composition stock solution or further diluted with water to be used as an aqueous solution, but it exhibits sufficient detergency. Therefore, it is preferable to use the detergent composition stock solution.
When cleaning the liquid crystal panel with the aqueous liquid cleaning composition for liquid crystal panel of the present invention, after filling the liquid crystal panel with liquid crystal, the liquid crystal panel is charged into the cleaning composition of the present invention, and immersed and ultrasonically cleaned. And so on.
[0025]
In addition to the above essential components, the aqueous liquid cleaning composition for liquid crystal panels of the present invention includes, as other optional components, amphoteric surfactants, cleaning builders, hydrotropes, etc. 30% by mass can be added to increase the cloud point, improve the cleaning power and the liquid stability, and the like. Furthermore, you may mix | blend 0.1-5 mass% with antirust agents, such as a benzotriazole and t-butyl benzoate, with respect to a composition.
In order to improve the liquid stability and the detergency, an alkylene oxide adduct of a linear alcohol having 11 or less carbon atoms that does not touch the regulations of the PRTR method (Chemical Substance Management Promotion Act) may be used in combination.
[0026]
As described above, since the aqueous liquid cleaning composition for liquid crystal panel of the present invention includes the above-described components (A) to (D), the liquid crystal material that has entered the gap of the liquid crystal panel and In addition to exhibiting an excellent cleaning effect for cleaning both surface deposits such as cullet, the flammability is also low and the composition is stable over time.
Furthermore, in this invention, since the C12-C15 alcohol ethylene oxide adduct is not used, there is little environmental impact and there is also no need for the notification prescribed | regulated by PRTR method (Chemical substance management promotion method).
[0027]
【Example】
EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated more concretely, this invention is not limited to the following Example.
[0028]
[Examples 1 to 5]
The components shown in Table 1 below were mixed to prepare an aqueous liquid cleaning composition for liquid crystal panels. In this case, after mixing components other than water sufficiently, water was added little by little to obtain a uniform liquid composition.
[0029]
[Table 1]
[0030]
[Comparative Examples 1-4]
The components shown in Table 2 below were mixed to prepare an aqueous liquid cleaning composition for liquid crystal panels. In this case, after mixing components other than water sufficiently, water was added little by little to obtain a uniform liquid composition.
[0031]
[Table 2]
[0032]
About each aqueous liquid detergent composition for liquid crystal panels obtained in the said Examples 1-5 and Comparative Examples 1-4, the representative liquid crystal panel was used and the cleaning power, rinse property, and liquid stability were evaluated. The results are shown in Table 3.
Each item was measured and evaluated by the following method.
[0033]
[1] Evaluation of Detergency A liquid crystal material was applied to a void portion of a liquid crystal panel having a 5 μm void cut to an appropriate size and stabilized at 80 ° C. for 8 hours to obtain a sample to be cleaned. As the liquid crystal panel, one having 100 to 300 cullets larger than the spacer (5 μm or more) attached to the surface terminal portion was used.
A liquid crystal panel is immersed in the stock solution of each liquid detergent composition prepared in Examples 1 to 5 and Comparative Examples 1 to 4, and an ultrasonic cleaner (50 kHz, 200 W, SC-20, Sun Electronics ( Was subjected to ultrasonic cleaning at 50 ° C. for 3 minutes.
[0034]
Subsequently, the panel to be cleaned was taken out, subjected to ultrasonic rinsing in 50 ° C. ion-exchanged water for 1 minute and under the same conditions as those for cleaning, and then dried in a constant temperature dryer at 105 ° C. for 60 minutes. After completion of drying, the voids are observed using a polarizing microscope (BX-60, Olympus Kogyo Co., Ltd.), and the residual liquid crystal material is evaluated using the following evaluation criteria and remains on the terminal surface. The number of cullets was counted, and the removal rate was calculated by the following method.
[0035]
(1) Detergency evaluation 1 (residual liquid crystal material)
◎: Completely cleaned ○: Almost cleaned △: Slightly cleaned ×: Not cleaned at all (2) Detergency evaluation 2 (caret removal rate)
Removal rate of cullet (%) = (number of cullet before washing−number of cullet after washing) / (number of cullet before washing) × 100
[0036]
[2] Rinsability evaluation Using the same liquid crystal panel as described above, the gap was thoroughly washed by thoroughly washing in ethanol. Thereafter, the liquid crystal panel was immersed in the liquid detergent compositions of the above Examples and Comparative Examples, and the cavity composition was filled in the voids by ultrasonic irradiation. The liquid crystal panel filled with the cleaning composition in this manner was simply immersed in ion exchange water at 50 ° C. for 3 minutes, then gently lifted and dried at 105 ° C. for 60 minutes. After the drying, the residual property of the cleaning composition in the voids was evaluated according to the following evaluation criteria using a microscope (BX-60, Olympus Kogyo Co., Ltd.).
◎: Rinsed completely and no cleaning agent remained. ○: Almost rinsed and almost no cleaning agent remained. △: Slightly rinsed and some cleaning agent remained. X: Cleaning agent not rinsed at all. A large amount remained [0037]
[3] Liquid stability In general, this type of cleaning composition is often heated to increase the cleaning efficiency, and uniformity in the high temperature region is a problem. The cloud point was used as an index of liquid stability.
The cloud point in the stock solution of the liquid detergent composition prepared in each of Examples 1 to 5 and Comparative Examples 1 to 4 was measured and evaluated according to the following criteria.
◎: 50 ° C or higher ○: 40 ° C or higher and lower than 50 ° C △: 30 ° C or higher and lower than 40 ° C ×: Less than 30 ° C or cloudiness / separation
[Table 3]
[0039]
As shown in Table 3, each of the liquid-crystal liquid detergent compositions for liquid crystal panels obtained in Examples 1 to 5 is superior to Comparative Examples 1 to 4 in cleaning properties of both the liquid crystal material and cullet, and is rinsed. It can be seen that the composition is excellent in stability and liquid stability.
[0040]
【The invention's effect】
As described above, according to the present invention, the aqueous liquid cleaning agent for liquid crystal panels is excellent in the removability of the liquid crystal material that has entered the voids of the liquid crystal panel, and is excellent in the removal of foreign matter on the surface of the liquid crystal panel electrode terminals such as cullet. A composition can be provided. In addition, since this detergent composition has low environmental impact and toxicity, is low in flammability, and does not use an alcohol ethylene oxide adduct having 12 to 15 carbon atoms, the PRTR method (Chemical Substance Management Promotion Method) There is no need to submit a notification as defined in).
Claims (1)
(A)下記一般式(1)で示される化合物;5〜60質量%
RR1CH(CH2)nO(AO)mH・・・(1)
(式中、RおよびR1は炭素数1〜8、かつ、n=1のときは、RおよびR1の合計炭素数が9以下、n=2のときは、RおよびR1の合計炭素数が8以下となるアルキル基を、nは1〜2の数を、AOは炭素数2〜4のオキシアルキレン基を、mは2〜10の数を示す。)
(B)下記一般式(2)で示される化合物;1〜25質量%
RR1CH(CH2)nO(AO)jH・・・(2)
(式中、R、R1、nおよびAOは上記と同じ。jは12〜30の数を示す。)
(C)下記一般式(3)で示される化合物;1〜20質量%
R2O(AO)kR3・・・(3)
(式中、R2は炭素数1〜6のアルキル基またはフェニル基もしくはベンジル基を、R3は水素原子または炭素数1〜6のアルキル基を、kは1〜5の数を示す。AOは上記と同じ。)
(D)炭素数8〜20の炭化水素化合物;1〜10質量%An aqueous liquid cleaning composition for a liquid crystal panel comprising the following components (A), (B), (C), (D) and a predetermined amount of water.
(A) Compound represented by the following general formula (1); 5 to 60% by mass
RR 1 CH (CH 2 ) n O (AO) m H (1)
(In the formula, R and R 1 have 1 to 8 carbon atoms, and when n = 1, the total carbon number of R and R 1 is 9 or less, and when n = 2, the total carbon of R and R 1 An alkyl group having a number of 8 or less, n is a number from 1 to 2, AO is an oxyalkylene group having 2 to 4 carbon atoms, and m is a number from 2 to 10.
(B) Compound represented by the following general formula (2): 1 to 25% by mass
RR 1 CH (CH 2 ) n O (AO) j H (2)
(In the formula, R, R 1 , n and AO are the same as above. J represents a number of 12 to 30.)
(C) Compound represented by the following general formula (3): 1 to 20% by mass
R 2 O (AO) k R 3 (3)
(In the formula, R 2 represents an alkyl group having 1 to 6 carbon atoms, a phenyl group or a benzyl group, R 3 represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and k represents a number of 1 to 5.) Is the same as above.)
(D) C8-20 hydrocarbon compound; 1-10% by mass
Priority Applications (3)
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JP2003041390A JP4069380B2 (en) | 2002-04-18 | 2003-02-19 | Aqueous liquid cleaning composition for liquid crystal panel |
TW92106261A TWI257950B (en) | 2002-04-18 | 2003-03-21 | Aqueous liquid cleaner compositions for LCD panels |
CN 03122204 CN1253545C (en) | 2002-04-18 | 2003-04-16 | Water liquid detergent composition for liquid crystal panel |
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JP2007302408A Division JP2008115394A (en) | 2002-04-18 | 2007-11-22 | Aqueous liquid cleaning agent composition for liquid crystal panel |
JP2007302418A Division JP4930720B2 (en) | 2002-04-18 | 2007-11-22 | Aqueous liquid cleaning composition for liquid crystal panel |
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JP5489452B2 (en) * | 2008-12-16 | 2014-05-14 | ライオン株式会社 | Liquid crystal panel cleaning composition and liquid crystal panel cleaning method |
JP6100669B2 (en) * | 2013-10-11 | 2017-03-22 | Jxエネルギー株式会社 | Cleaning liquid composition |
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2003
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