JP3427130B2 - Method of laminating pressure-sensitive adhesive layer for attaching polarizing plate or retardation plate - Google Patents

Method of laminating pressure-sensitive adhesive layer for attaching polarizing plate or retardation plate

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Publication number
JP3427130B2
JP3427130B2 JP34406793A JP34406793A JP3427130B2 JP 3427130 B2 JP3427130 B2 JP 3427130B2 JP 34406793 A JP34406793 A JP 34406793A JP 34406793 A JP34406793 A JP 34406793A JP 3427130 B2 JP3427130 B2 JP 3427130B2
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JP
Japan
Prior art keywords
adhesive layer
pressure
polarizing plate
sensitive adhesive
plate
Prior art date
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JP34406793A
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Japanese (ja)
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JPH07174918A (en
Inventor
千代次 人見
禎子 須藤
Original Assignee
藤森工業株式会社
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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、液晶ディスプレー等の
製造に用いる偏光板又は位相差板に粘着剤層を積層して
なる偏光板又は位相差板貼付用部材を製造するに際して
好適に用いることが可能な偏光板又は位相差板貼付用粘
着剤層の積層方法に関し、更に詳述すると、粘着剤層を
ガラス基板等よりも偏光板や位相差板の方により強く粘
着するようにした、偏光板又は位相差板貼付用粘着剤層
の積層方法に関する。
FIELD OF THE INVENTION The present invention is suitable for use in manufacturing a polarizing plate or a retardation plate sticking member obtained by laminating a pressure-sensitive adhesive layer on a polarizing plate or retardation plate used for manufacturing a liquid crystal display or the like. With respect to a method of laminating a pressure-sensitive adhesive layer for sticking a polarizing plate or a retardation plate, it will be described in more detail. The pressure-sensitive adhesive layer is more strongly adhered to the polarizing plate or the retardation plate than to the glass substrate or the like. The present invention relates to a method for laminating a pressure-sensitive adhesive layer for sticking a plate or a retardation plate.
【0002】[0002]
【従来の技術及び発明が解決しようとする課題】液晶デ
ィスプレー(以下、LCDという)は、図3に示すよう
に、ガラス等の基板a,aで液晶高分子bを挟み、これ
らの基板の一方の面に偏光板c、他方の面に順次位相差
板d及び偏光板cを積層することにより構成されてい
る。この場合、ガラス基板aと偏光板c、ガラス基板a
と位相差板d、位相差板dと偏光板cとはそれぞれ粘着
剤層e,e,eを介して積層されているのが一般的であ
る。
2. Description of the Related Art As shown in FIG. 3, a liquid crystal display (hereinafter, referred to as LCD) has a liquid crystal polymer b sandwiched between substrates a made of glass or the like and one of these substrates is used. The polarizing plate c is laminated on the surface of the above, and the retardation plate d and the polarizing plate c are sequentially laminated on the other surface. In this case, the glass substrate a, the polarizing plate c, the glass substrate a
The retardation plate d and the retardation plate d and the polarizing plate c are generally laminated via the adhesive layers e, e, e, respectively.
【0003】このような構成のLCDを製造するに際
し、偏光板cや位相差板dをガラス基板aに積層するも
のであるが、この方法としては、図4に示すように偏光
板c又は位相差板dの一方の面に保護フィルムfを積層
すると共に、他方の面に粘着剤層eを形成し、この粘着
剤層eの上にセパレーター(剥離紙)gを積層した偏光
板又は位相差板貼付用部材hを製造しておき、LCD製
造の際、この貼付用部材hからセパレーターgを剥がし
てからガラス基板a上に粘着剤層eの粘着力を利用して
偏光板cや位相差板dを積層することが行われている。
In manufacturing an LCD having such a structure, a polarizing plate c and a retardation plate d are laminated on a glass substrate a. As this method, as shown in FIG. A polarizing plate or a retardation film in which a protective film f is laminated on one surface of a phase difference plate d, an adhesive layer e is formed on the other surface, and a separator (release paper) g is laminated on the adhesive layer e. The plate sticking member h is manufactured in advance, and when the LCD is manufactured, the separator g is peeled off from the sticking member h, and then the adhesive force of the pressure-sensitive adhesive layer e is used on the glass substrate a to make the polarizing plate c and the phase difference. Lamination of the plates d is performed.
【0004】ここで、従来、図4に示したような偏光板
又は位相差板貼付用部材hの製造は、例えば図6に示す
ように、ロール1からセパレーターg(断面図を図6中
の(A)に示した)を繰り出し、このセパレーターgに
ドクターコート等の塗工機2で粘着剤eを塗工し(断面
図(B))、次いで乾燥機3にセパレーターgを通して
乾燥し、一方保護フィルムfを積層した偏光板c又は位
相差板dをロール4から繰り出し、これを粘着剤層e側
に貼り合わせて貼付用部材h(断面図(C))を作製
し、得られた貼付用部材hをロール5に巻き取っておく
方法が採用されている。
Here, conventionally, for manufacturing the polarizing plate or the retardation plate attaching member h as shown in FIG. 4, for example, as shown in FIG. 6, a roll 1 to a separator g (a sectional view is shown in FIG. (Shown in (A)), and the adhesive e is applied to the separator g with a coating machine 2 such as a doctor coat (cross-sectional view (B)), and then the separator g is passed through a dryer 3 to be dried, The polarizing plate c or the retardation film d laminated with the protective film f is drawn out from the roll 4, and is adhered to the pressure-sensitive adhesive layer e side to prepare a sticking member h (cross-sectional view (C)), and the obtained sticking A method of winding the working member h around the roll 5 is adopted.
【0005】あるいは、図7に示すような2段階で作製
する方法も採用されている。この方法は、まず第(I)
段階で、ロール1からセパレーターg(断面図(A))
を繰り出し、このセパレーターgにドクターコート等の
塗工機2で粘着剤を塗工し、次いで乾燥機3にセパレー
ターgを通して乾燥した(断面図(B))後、別のロー
ル6から繰り出したセパレーターg’をこの粘着剤層の
上に貼りつけていわゆる両面テープi(断面図(C))
を作製し、この両面テープiをロール7に巻回してお
く。そして第(II)段階で、ロール7から予め作製し
た両面テープiを繰り出し、一方のセパレーターg’を
ロール8に巻つけて剥がし、粘着剤層eの一方の面を露
出させ(断面図(D)た後、別のロール4から繰り出し
た保護フィルムfを積層した偏光板c又は位相差板dを
この粘着剤層eの露出面に貼り合わせて貼付用部材h
(断面図(E))を作製し、得られた貼付用部材hをロ
ール5に巻回しておくものである。
Alternatively, a method of manufacturing in two steps as shown in FIG. 7 is also adopted. This method is the first (I)
At the stage, the roll 1 to the separator g (cross-sectional view (A))
The adhesive was applied to the separator g with a coating machine 2 such as a doctor coat, and then the separator g was passed through the dryer 3 to be dried (cross-sectional view (B)), and then the separator fed from another roll 6 A double-sided tape i (cross-sectional view (C)) is prepared by pasting g'onto this adhesive layer.
And double-sided tape i is wound around a roll 7. Then, in the step (II), the double-sided tape i prepared in advance is fed out from the roll 7, one separator g ′ is wound around the roll 8 and peeled off to expose one surface of the pressure-sensitive adhesive layer e (cross-sectional view (D ), A polarizing plate c or a retardation plate d, on which a protective film f fed from another roll 4 is laminated, is attached to the exposed surface of the pressure-sensitive adhesive layer e, and a sticking member h
(Cross-sectional view (E)) is prepared, and the obtained sticking member h is wound around the roll 5.
【0006】ところで、偏光板又は位相差板貼付用部材
をガラス基板上に積層した場合、貼着時に気泡やシワ等
が発生することがあり、このときには図5に示すように
一度偏光板や位相差板をガラス基板から剥離し、修正し
た後再度貼り直す作業が必要となる。この場合、偏光板
や位相差板をガラス基板から剥がした際に、粘着剤層が
偏光板や位相差板に100%伴ってくる必要がある。こ
のため、偏光板や位相差板での検査・評価過程で上記の
工程を模倣した再剥離性試験を実施しているが、従来、
かかる再剥離性試験でガラス基板上に粘着剤が残るとい
う問題がある。
By the way, when a polarizing plate or a member for laminating a retardation film is laminated on a glass substrate, bubbles or wrinkles may occur during the laminating. At this time, as shown in FIG. It is necessary to peel off the phase difference plate from the glass substrate, correct it, and then reattach it. In this case, when the polarizing plate or the retardation plate is peeled off from the glass substrate, the pressure-sensitive adhesive layer needs to accompany the polarizing plate or the retardation plate by 100%. For this reason, a re-peelability test imitating the above steps is carried out in the inspection / evaluation process using a polarizing plate or a retardation plate.
There is a problem that the adhesive remains on the glass substrate in the removability test.
【0007】これは、粘着剤層のガラス基板に対する粘
着力が粘着剤層の偏光板や位相差板に対する粘着力より
も強いためである。このため、従来より両面テープにお
ける粘着剤層の両面の粘着力を異ならしめ、粘着剤層の
粘着力の強い方の面に偏光板や位相差板を貼着し、粘着
力の弱い方の面にガラス基板を貼着するようにすること
が行われている。
This is because the adhesive force of the adhesive layer to the glass substrate is stronger than the adhesive force of the adhesive layer to the polarizing plate and the retardation plate. Therefore, the adhesive strength of both sides of the adhesive layer in the double-sided tape has been made different from the conventional one, and the polarizing plate or the retardation plate is attached to the side of the adhesive layer having the stronger adhesive force, and It is practiced to attach a glass substrate to the.
【0008】この場合、粘着剤の粘着力を変える一般的
な対処方法として粘着剤組成を変更する方法があるが、
この方法は組成選定、最適化に多くの労力を必要とす
る。
In this case, there is a method of changing the pressure-sensitive adhesive composition as a general measure for changing the pressure-sensitive adhesive strength of the pressure-sensitive adhesive.
This method requires a lot of labor for composition selection and optimization.
【0009】また、粘着剤層が剥離剤を塗布したセパレ
ーター上に塗布・形成される際に、粘着剤層がセパレー
ターとの接触により粘着性の低下が生じることが知られ
ており、このためセパレーターの表面特性を改良した
り、剥離剤の種類の変更を行うことも広く採用されてい
る。
Further, it is known that when the pressure-sensitive adhesive layer is applied / formed on the separator coated with the release agent, the pressure-sensitive adhesive layer causes a decrease in the adhesiveness due to contact with the separator, and therefore the separator is It is also widely adopted to improve the surface characteristics of the above and change the type of the release agent.
【0010】しかしながら、この方法は、剥離性調整に
時間を要し、また、両面の2種類のセパレーターの開発
を行う必要があり、コスト的に不利である。しかも、こ
れらの方法は、粘着剤層の粘着力を低下させるものであ
るので、粘着剤の機能から好ましくないものである。
However, this method is disadvantageous in terms of cost because it takes time to adjust the peelability and it is necessary to develop two types of separators on both sides. Moreover, these methods reduce the adhesive strength of the pressure-sensitive adhesive layer, and are not preferable because of the function of the pressure-sensitive adhesive.
【0011】本発明は、上記事情に鑑みなされたもの
で、ガラス基板等の基板に偏光板又は位相差板を粘着剤
層を介して積層して液晶表示板等を製造するに際し、偏
光板や位相差板を再剥離可能にガラス基板上に積層する
ことができる偏光板又は位相差板貼付用部材を簡便に製
造することができる、偏光板又は位相差板貼付用粘着剤
層の積層方法を提供することを目的とする。
The present invention has been made in view of the above circumstances. When manufacturing a liquid crystal display panel or the like by laminating a polarizing plate or a retardation plate on a substrate such as a glass substrate with an adhesive layer, A method for laminating a polarizing plate or a retardation plate-attaching pressure-sensitive adhesive layer, which can easily produce a polarizing plate or a retardation plate-attaching member which can be laminated on a glass substrate so that the retardation plate can be re-peeled. The purpose is to provide.
【0012】[0012]
【課題を解決するための手段及び作用】本発明者は、上
記目的を達成するため鋭意検討を重ねた結果、粘着剤層
の被着体に貼着すべき面をコロナ放電処理等で表面活性
処理することによって該処理面の粘着力が顕著に向上す
ることを見いだした。
Means and Actions for Solving the Problems As a result of intensive studies to achieve the above object, the present inventor has found that the surface of the pressure-sensitive adhesive layer to be adhered to the adherend is surface-activated by corona discharge treatment or the like. It has been found that the treatment significantly improves the adhesive strength of the treated surface.
【0013】即ち、従来、プラスチックの表面処理とし
てプラスチックの表面にコロナ放電処理等の表面活性処
理を行うことは良く知られており、本発明者も粘着剤の
偏光板や位相差板に対する密着性を向上させ、再剥離の
際に粘着剤を偏光板や位相差板の方に伴わせるために偏
光板や位相差板の面のコロナ放電処理を試みたが、その
効果は不十分であった。ところが、従来の発想とは逆に
粘着剤層にコロナ放電処理を行うと、コロナ放電処理を
行った粘着剤層の面の粘着力が意外にも顕著に向上する
ことを見い出した。
That is, it has been well known that surface activation treatment such as corona discharge treatment is performed on the surface of plastic as the surface treatment of plastic, and the present inventor has also adhered the adhesive to the polarizing plate or the retardation plate. Of the polarizing plate and the retardation plate in order to improve the adhesiveness and to attach the adhesive to the polarizing plate and the retardation plate at the time of re-peeling, but the effect was insufficient. . However, contrary to the conventional idea, it was found that when the adhesive layer is subjected to corona discharge treatment, the adhesive strength of the surface of the adhesive layer subjected to corona discharge treatment is significantly improved.
【0014】この方法を偏光板又は位相差板貼付用部材
の製造に適用すれば、従来の粘着剤層を偏光板や位相差
板に貼り付ける前に、粘着剤層の偏光板や位相差板に貼
り付ける面に対してコロナ放電処理等の表面活性処理で
きる装置を設ければよく、簡便であると共に、粘着特性
を一定範囲で容易に向上させることができ、しかも粘着
力の低下を生じさせることがない。そして、このような
貼付用部材を用いて液晶ディスプレーを製造すると、粘
着剤層の活性処理を行っていない面がガラス基板等の基
板に貼着することになり、粘着剤層が基板より偏光板や
位相差板の方に強く貼着し、その結果再剥離時に粘着剤
が基板に残らずに偏光板や位相差板に確実に伴ってくる
ことを見い出し、本発明をなすに至ったものである。
When this method is applied to the production of a member for sticking a polarizing plate or a retardation plate, the polarizing plate or the retardation plate of the adhesive layer can be formed before the conventional pressure-sensitive adhesive layer is stuck to the polarizing plate or the retardation plate. It is only necessary to provide a device capable of surface activation treatment such as corona discharge treatment on the surface to be attached to, and it is simple, and the adhesive property can be easily improved within a certain range, and further, the adhesive strength is reduced. Never. When a liquid crystal display is manufactured using such a sticking member, the surface of the pressure-sensitive adhesive layer that has not been subjected to activation treatment is bonded to a substrate such as a glass substrate, and the pressure-sensitive adhesive layer is used as a polarizing plate rather than a substrate. The present invention has been completed by strongly adhering to a retardation plate or a retardation plate, and as a result, it was found that the adhesive does not remain on the substrate upon re-peeling and is surely accompanied by the polarizing plate or the retardation plate. is there.
【0015】このように、コロナ放電処理等の表面活性
処理により粘着剤層の粘着力が向上する理由は明らかで
はないが、表面活性処理により粘着剤の表面が粗面化
し、被着体表面の細隙の中に粘着剤が入り易くなり、こ
の細隙の中に食い込んだ粘着剤が錨をおろすように強い
粘着力を発揮する投錨効果が発生したり、あるいは粘着
剤表面にカルボニル基やカルボキシル基等が発生し、表
面が極性化されることによって粘着力が向上することが
考えられる。
Thus, the reason why the adhesive strength of the pressure-sensitive adhesive layer is improved by the surface activation treatment such as corona discharge treatment is not clear, but the surface of the pressure-sensitive adhesive is roughened by the surface activation treatment and the surface of the adherend is It becomes easier for the adhesive to enter into the slits, and the adhesive that digs into the slits exerts an anchoring effect that exerts a strong adhesive force so as to lower the anchor, or there is a carbonyl group or carboxyl group on the adhesive surface. It is considered that the adhesive force is improved by the generation of groups and the like and the surface being polarized.
【0016】従って、本発明は、液晶表示板等の製造に
際し、偏光板又は位相差板に粘着剤層を積層する粘着剤
の積層方法において、粘着剤層の一方の面に表面活性処
理を行い、該処理を行った粘着剤層の面に偏光板又は位
相差板を貼着することを特徴とする偏光板又は位相差板
貼付用粘着剤層の積層方法を提供する。
Therefore, in the present invention, in the production of a liquid crystal display panel or the like, in the method of laminating an adhesive layer on a polarizing plate or a retardation plate, one surface of the adhesive layer is subjected to surface activation treatment. The present invention also provides a method for laminating a pressure-sensitive adhesive layer for sticking a polarizing plate or a retardation plate, which comprises sticking a polarizing plate or a retardation plate on the surface of the pressure-sensitive adhesive layer that has been subjected to the treatment.
【0017】以下、本発明について更に詳しく説明する
と、本発明の偏光板又は位相差板貼付用粘着剤層の積層
方法は、上述したように粘着剤層の一方の面に表面活性
処理を行い、該処理を行った粘着剤層の面に偏光板又は
位相差板を貼着することに特徴がある。
The present invention will be described in more detail below. In the method for laminating a pressure-sensitive adhesive layer for sticking a polarizing plate or a retardation plate of the present invention, one surface of the pressure-sensitive adhesive layer is subjected to surface activation treatment as described above. It is characterized in that a polarizing plate or a retardation plate is attached to the surface of the pressure-sensitive adhesive layer that has been subjected to the treatment.
【0018】かかる表面活性処理として、具体的には、
コロナ放電処理、プラズマ処理、紫外線照射、電子線照
射、アンカー剤塗布を例示することができ、これらは公
知の通常の処理法、処理条件を採用して行うことができ
る。
As the surface activation treatment, specifically,
Examples thereof include corona discharge treatment, plasma treatment, ultraviolet irradiation, electron beam irradiation, and application of an anchor agent, and these can be performed by adopting known ordinary processing methods and processing conditions.
【0019】これに限定されるものではないが、コロナ
放電処理は、電極とロールとの間にすき間を設け、これ
らの間に高電圧をかけて放電を起こさせ、電極とロール
の間に配置した粘着剤層を処理するもので、具体的な条
件は特に制限されないが、例えば出力は1.0〜2.5
キロワット、湿度は40〜70%、電極はロール電極等
が良く、ギャップ幅は2〜4mm、処理速度は20〜3
0m/分の条件を採用することができる。
Although not limited to this, the corona discharge treatment is arranged between the electrode and the roll by providing a gap between the electrode and the roll and applying a high voltage between them to cause discharge. The pressure-sensitive adhesive layer is treated, and the specific conditions are not particularly limited, but the output is 1.0 to 2.5, for example.
Kilowatt, humidity 40-70%, good electrode such as roll electrode, gap width 2-4mm, processing speed 20-3
The condition of 0 m / min can be adopted.
【0020】プラズマ処理は、減圧下ないしは大気圧下
で発生させた不活性ガスや酸素ガス等のプラズマによる
化学反応処理であり、減圧プラズマの条件としては、圧
力は0.01〜1torr、アルゴン等の不活性ガスに
酸素を10%程度混合した雰囲気、あるいは大気の減圧
下の雰囲気で、高周波出力が数十〜数千ワット、周波数
は13.56MHz、2.54GHz、10kHz付近
が一般的であり、処理時間は数秒から60分程度とする
ことができる。減圧プラズマのより具体的な条件を示す
と、Ar(90%)とO2 (10%)のガスを用い、
圧力10-1torr下で、高周波出力100W、周波数
13.56MHz、処理時間10分の条件、あるいは空
気を用い、圧力10-1torr、高周波出力100W、
周波数13.56MHz、処理時間5分の条件で行うこ
とができる。また、大気圧プラズマとしては、例えば特
開平2−1517号公報に記載された方法を採用するこ
とができ、具体的にはヘリウム等の不活性ガスに酸素ガ
スを5%程度混合した雰囲気下で、高周波出力10〜1
50W、周波数1〜13.56kHz、処理時間5〜1
0分の条件で行うことができる。
The plasma treatment is a chemical reaction treatment with plasma of an inert gas or oxygen gas generated under reduced pressure or atmospheric pressure. The conditions of the reduced pressure plasma are 0.01 to 1 torr of pressure and argon. In general, the high frequency output is several tens to several thousands watts, and the frequency is 13.56 MHz, 2.54 GHz, and 10 kHz in an atmosphere in which about 10% of oxygen is mixed with the inert gas of, or under a reduced pressure atmosphere. The processing time can be about several seconds to 60 minutes. More specific conditions of the low-pressure plasma are as follows. Ar (90%) and O 2 (10%) gases are used.
At a pressure of 10 -1 torr, a high frequency output of 100 W, a frequency of 13.56 MHz, a processing time of 10 minutes, or using air, a pressure of 10 -1 torr, a high frequency of 100 W,
It can be performed under the conditions of a frequency of 13.56 MHz and a processing time of 5 minutes. As the atmospheric pressure plasma, for example, the method described in Japanese Patent Application Laid-Open No. 2-1517 can be adopted, and specifically, in an atmosphere in which an inert gas such as helium is mixed with about 5% oxygen gas. , High frequency output 10-1
50W, frequency 1-13.56kHz, processing time 5-1
It can be performed under the condition of 0 minutes.
【0021】紫外線照射としては、例えば水素放電管、
キセノン放電管、水銀ランプ、レーザー等の紫外線源を
用い、波長150〜2000nmの紫外線を5〜60分
間程度照射することにより行うことができる。より具体
的な条件を示すと、日本電池(株)製DeeP UVを
用い、低圧水銀ランプの波長254.185nmで、出
力1kW、ランプとサンプルの距離50mmの条件を採
用することができる。
Examples of the ultraviolet irradiation include hydrogen discharge tubes,
It can be carried out by irradiating ultraviolet rays having a wavelength of 150 to 2000 nm for about 5 to 60 minutes using an ultraviolet ray source such as a xenon discharge tube, a mercury lamp and a laser. More specifically, it is possible to use DeeP UV manufactured by Nippon Battery Co., Ltd. under the condition that the low pressure mercury lamp has a wavelength of 254.185 nm, the output is 1 kW, and the distance between the lamp and the sample is 50 mm.
【0022】電子線照射は、10-5〜10-7torrの
圧力下で、ビーム電流値1〜10mA、処理スピード3
〜6m/分、チタン箔厚15〜35μm、加速電圧15
0〜250kV、照射量0.5〜120Mrad程度と
することができる。
The electron beam irradiation is carried out under a pressure of 10 −5 to 10 −7 torr, a beam current value of 1 to 10 mA, and a processing speed of 3
~ 6 m / min, titanium foil thickness 15-35 μm, acceleration voltage 15
The irradiation amount can be set to 0 to 250 kV and the irradiation amount can be set to about 0.5 to 120 Mrad.
【0023】アンカー剤塗布としては、イソシアネート
系、ウレタン系、イミン系等のアンカー剤を用いて、
0.4〜1.0g/m2の量で塗布することが良い。塗
布の方法としては、グラビヤロール等の公知の方法を採
用することができる。
For the application of the anchor agent, an isocyanate-based, urethane-based, imine-based anchor agent or the like is used.
It is preferable to apply it in an amount of 0.4 to 1.0 g / m 2 . As a coating method, a known method such as gravure roll can be adopted.
【0024】これらの表面処理方法の中では、コロナ放
電処理とプラズマ処理が好ましい。また、これらの表面
処理方法が有効な粘着剤の材料としては、液晶ディスプ
レー用途に一般的に用いられるアクリル系粘着剤が好ま
しいが、これに限らず、例えば天然ゴム系、SBR系、
SIS,SBS,SEBSブロック系、ブチルゴム系、
再生ゴム系等のゴム系粘着剤、シリコーン系粘着剤等の
粘着剤に適用可能である。
Among these surface treatment methods, corona discharge treatment and plasma treatment are preferable. Further, as the material of the pressure-sensitive adhesive for which these surface treatment methods are effective, an acrylic pressure-sensitive adhesive generally used for liquid crystal displays is preferable, but not limited to this, and examples thereof include natural rubber-based, SBR-based, and the like.
SIS, SBS, SEBS block system, butyl rubber system,
It is applicable to rubber-based pressure sensitive adhesives such as recycled rubber and silicone pressure sensitive adhesives.
【0025】本発明の偏光板又は位相差板貼付用粘着剤
層の積層方法に用いる偏光板及び位相差板としては、液
晶ディスプレー等の液晶表示板に用いられているもの全
てが使用可能であり、具体的な材質としては、例えばト
リアセテートセルロース、ポリカーボネート等の樹脂で
作製されているものが好適である。
As the polarizing plate and the retardation plate used in the method for laminating the pressure-sensitive adhesive layer for sticking the polarizing plate or the retardation plate of the present invention, all those used for liquid crystal display plates such as liquid crystal displays can be used. As a specific material, for example, a material made of a resin such as triacetate cellulose or polycarbonate is suitable.
【0026】本発明は偏光板又は位相差板貼付用部材の
製造に際し好適に用いることが可能な、偏光板又は位相
差板貼付用粘着剤層の積層方法に関するものであるが、
実際に貼付用部材を製造する場合には、図4に示したよ
うに粘着剤層の保護のため粘着剤層にセパレーターを貼
った状態にするのが普通である。このようなセパレータ
ーとしては、紙又はフィルムベースによる一般的なもの
が使用可能である。
The present invention relates to a method for laminating a pressure-sensitive adhesive layer for sticking a polarizing plate or a retardation plate, which can be suitably used in the production of a member for sticking a polarizing plate or a retardation plate.
In the case of actually manufacturing a sticking member, it is usual to put a separator on the pressure-sensitive adhesive layer in order to protect the pressure-sensitive adhesive layer as shown in FIG. As such a separator, a general separator based on paper or film can be used.
【0027】本発明方法により図4に示した偏光板又は
位相差板貼付用部材を製造する場合には、上述した1段
階で製造する方法と、2段階で製造する方法とがある。
1段階で製造する方法の工程を図1に示した。図1の工
程は、図6に示した従来の偏光板又は位相差板に粘着剤
層を貼着する工程の直前に、コロナ放電処理等の表面活
性装置9による表面活性処理工程を設けたもので、ロー
ル1からセパレーターg(断面図(A))を繰り出し、
このセパレーターgに塗工機2で粘着剤を塗工し、次い
で乾燥機3で乾燥した(断面図(B))後、コロナ放電
等の表面活性装置9で粘着剤層eの表面処理を行い、こ
れをロール4から繰り出した保護フィルムfを積層した
偏光板c又は位相差板dに貼着し、得られた貼付用部材
h(断面図(D))をロール5に巻回しておくものであ
る。
When the polarizing plate or the retardation plate-attaching member shown in FIG. 4 is manufactured by the method of the present invention, there are the above-mentioned one-step manufacturing method and the two-step manufacturing method.
The process steps of the one-step manufacturing method are shown in FIG. In the process of FIG. 1, a surface activation treatment step by a surface activation device 9 such as corona discharge treatment is provided immediately before the step of attaching the pressure-sensitive adhesive layer to the conventional polarizing plate or retardation plate shown in FIG. Then, the separator g (cross-sectional view (A)) is fed from the roll 1,
After applying an adhesive to the separator g with a coater 2 and then drying with a dryer 3 (cross-sectional view (B)), the surface of the adhesive layer e is treated with a surface activating device 9 such as corona discharge. Affixing this to a polarizing plate c or a retardation plate d in which a protective film f fed from a roll 4 is laminated, and winding the obtained sticking member h (cross-sectional view (D)) around a roll 5. Is.
【0028】また、2段階で製造する方法を図2に示し
た。この製造工程は、図7に示した従来例の工程の第2
段階での偏光板又は位相差板に粘着剤層を貼着する工程
の直前に、コロナ放電処理等の表面活性装置9による表
面活性化処理工程を加えたものである。この工程は、ま
ず第(I)段階で、図7に示したと同様に、予め両面テ
ープiを作製してロール7に巻回しておく。そして第
(II)段階で、このロール7から両面テープi(断面
図(C))を繰り出し、両面テープiから一方のセパレ
ーターg’をロール8に巻つけて剥がし、粘着剤層eの
一面側を露出させ、次いで露出させた粘着剤層eの表面
のコロナ放電処理を行った(断面図(D))後、別のロ
ール4から繰り出した保護フィルムfを積層した偏光板
c又は位相差板dを粘着剤層eに積層し、得られた貼付
用部材h(断面図(E))をロール5に巻回しておくも
のである。
A method of manufacturing in two steps is shown in FIG. This manufacturing process is the same as the second conventional process shown in FIG.
The surface activation treatment step by the surface activation device 9 such as corona discharge treatment is added immediately before the step of attaching the pressure-sensitive adhesive layer to the polarizing plate or the retardation plate in the step. In this step, first, in the step (I), as in the case shown in FIG. 7, the double-sided tape i is prepared in advance and wound on the roll 7. Then, in the step (II), the double-sided tape i (cross-sectional view (C)) is unwound from the roll 7, one separator g ′ is wound around the roll 8 and peeled off from the double-sided tape i, and one side of the adhesive layer e Is exposed, and then the exposed surface of the pressure-sensitive adhesive layer e is subjected to corona discharge treatment (cross-sectional view (D)), and then a polarizing plate c or a retardation plate on which a protective film f fed from another roll 4 is laminated. d is laminated on the pressure-sensitive adhesive layer e, and the obtained sticking member h (cross-sectional view (E)) is wound around the roll 5.
【0029】このように製造した貼付用部材は、コロナ
放電処理を行って表面が活性化された面の粘着剤層に偏
光板又は位相差板が貼着されているため、粘着剤層と偏
光板又は位相差板との間の粘着力が強い。従って、図3
に示した液晶ディスプレーを製造した場合、粘着剤層の
ガラス基板に対する粘着力よりも粘着剤層の偏光板又は
位相差板に対する粘着力の方がより強力であるため、ガ
ラス基板から偏光板や位相差板を再剥離した際に、粘着
剤が偏光板や位相差板の方に確実に伴い、ガラス基板に
粘着剤が残存することを防止することができる。
Since the adhesive member thus produced has a polarizing plate or a retardation plate attached to the adhesive layer on the surface of which the surface has been activated by corona discharge treatment, Strong adhesion between the plate and the retardation plate. Therefore, FIG.
In the case of manufacturing the liquid crystal display shown in, the adhesive force of the adhesive layer to the polarizing plate or the retardation plate is stronger than the adhesive force of the adhesive layer to the glass substrate. When the phase difference plate is peeled again, the pressure-sensitive adhesive is surely attached to the polarizing plate or the phase difference plate, and it is possible to prevent the pressure-sensitive adhesive from remaining on the glass substrate.
【0030】本発明の偏光板又は位相差板貼付用粘着剤
層の積層方法は、このように両面テープの粘着剤層の一
方の面に表面活性処理を行うことにより、粘着剤層の一
方の面の粘着力を向上させるものである。この粘着力の
差を具体的に示すと、後述する粘着力試験(180°剥
離法)による測定法で、活性処理した面の粘着力が80
0〜3000g/25mm巾、特に1500〜2500
g/25mm巾の範囲、活性処理しない面の粘着力が2
00〜800g/25mm巾、特に300〜600g/
25mm巾の範囲とすることが好ましい。
The method for laminating the pressure-sensitive adhesive layer for sticking the polarizing plate or the retardation plate of the present invention is such that one surface of the pressure-sensitive adhesive layer of the double-sided tape is subjected to surface activation treatment so that one of the pressure-sensitive adhesive layers is It improves the adhesive strength of the surface. Specifically, the difference in the adhesive strength is shown by the adhesive strength test (180 ° peeling method), which will be described later, showing that the adhesive strength of the active-treated surface is 80.
0-3000g / 25mm width, especially 1500-2500
g / 25mm width range, the adhesive strength of the surface not activated is 2
00-800 g / 25 mm width, especially 300-600 g /
The width is preferably 25 mm.
【0031】本発明の偏光板又は位相差板貼付用粘着剤
層の積層方法を用いて得られる貼付用部材は、液晶ディ
スプレーのような液晶表示板等の製造に用いるものであ
るが、この液晶表示板としては、基板と偏光板、基板と
位相差板とのいずれかを粘着剤層を介して積層する構成
を有するもの全てに適用可能であり、特に基板としてガ
ラスを用いたものに好適に使用することができる。
The sticking member obtained by using the method for laminating the polarizing plate or the pressure-sensitive adhesive layer for sticking a retardation plate of the present invention is used for manufacturing a liquid crystal display plate such as a liquid crystal display. The display plate can be applied to all those having a structure in which any one of a substrate and a polarizing plate, and a substrate and a retardation plate are laminated via an adhesive layer, and is particularly suitable for those using glass as the substrate. Can be used.
【0032】[0032]
【実施例】以下、実施例と比較例を示し、本発明を具体
的に示すが、本発明は下記の実施例に制限されるもので
はない。
EXAMPLES Hereinafter, the present invention will be specifically shown by showing Examples and Comparative Examples, but the present invention is not limited to the following Examples.
【0033】[実施例1]図2に示した工程により、綜
研化学の粘着剤SKダイン2003(アクリル系粘着
剤)をフィルムセパレーターに25μm(ドライ)の厚
さに塗布し、乾燥後、粘着面にセパレーターを合わせ、
両面テープを作製して巻き取った。
[Example 1] By the process shown in FIG. 2, the Soken Kagaku adhesive SK Dyne 2003 (acrylic adhesive) was applied to a film separator to a thickness of 25 μm (dry), and after drying, the adhesive surface Align the separator with
A double-sided tape was prepared and wound up.
【0034】その後、巻き取った両面テープを繰り出し
て片側のセパレーターを剥離して粘着層を露出させ、こ
の粘着剤層にコロナ放電処理(条件:出力2.5kW、
バー電極、速度20m/分、20℃,50%RH)を行
うと共に、片側よりトリアセテートセルロース製の偏光
板を供給し、粘着剤層に偏光板を積層した。
Then, the wound double-sided tape is unwound and the separator on one side is peeled off to expose the adhesive layer, and the adhesive layer is subjected to corona discharge treatment (condition: output 2.5 kW,
A bar electrode was operated at a speed of 20 m / min at 20 ° C. and 50% RH), and a polarizing plate made of triacetate cellulose was supplied from one side to laminate the polarizing plate on the adhesive layer.
【0035】その後、下記条件で再剥離試験を行ったと
ころ、ガラス基板上に粘着剤層の残りは全く見られなか
った。
After that, when a re-peeling test was conducted under the following conditions, no residual adhesive layer was found on the glass substrate.
【0036】なお、粘着剤層のコロナ処理を行った面と
コロナ処理を行わなかった面のそれぞれの粘着力を下記
に示した粘着力試験により測定したところ、コロナ処理
を行った面の粘着力は200g/25mm巾、コロナ処
理を行わなかった面の粘着力は50g/25mm巾であ
った。
The adhesive strengths of the corona-treated surface and the non-corona-treated surface of the adhesive layer were measured by the adhesive strength test shown below. Had a width of 200 g / 25 mm, and the adhesive strength of the surface not subjected to corona treatment was 50 g / 25 mm width.
【0037】<再剥離性試験>偏光板又は位相差板とガ
ラス基板とを貼着後、50℃で5kg/cm2、20分
の条件でオートクレーブ処理を行い、その後、70℃で
3時間再配向処理をした後、室温で2時間放置し、手で
ガラス基板から偏光板又は位相差板を剥がす。
<Removability Test> After sticking the polarizing plate or the retardation plate to the glass substrate, autoclave treatment was carried out at 50 ° C. under conditions of 5 kg / cm 2 and 20 minutes, and then re-peel at 70 ° C. for 3 hours. After the alignment treatment, the plate is left at room temperature for 2 hours, and the polarizing plate or the retardation plate is peeled off from the glass substrate by hand.
【0038】<粘着力試験>トリアセテートセルロース
偏光板表面に、粘着テープの粘着剤層を貼着し、5kg
/cm2の圧力をかけた後20℃,65%RHの環境に
3時間放置した。その後粘着テープを25m/m幅に切
り、次いで粘着テープを偏光板から180°の角度、3
00mm/分の速度で引張り、剥離抵抗を測定した。
<Adhesive strength test> An adhesive layer of an adhesive tape was attached to the surface of a triacetate cellulose polarizing plate, and 5 kg was obtained.
/ 20 ° C. After applying a pressure of cm 2, and allowed to stand for 3 hours in 65% RH environment. After that, the adhesive tape was cut into 25 m / m width, and then the adhesive tape was placed at an angle of 180 ° from the polarizing plate.
The peel resistance was measured by pulling at a speed of 00 mm / min.
【0039】[実施例2]図1に示した工程により、綜
研化学の粘着剤SKダイン2003をセパレーターに塗
布し、乾燥後、粘着剤面を実施例1と同様の条件でコロ
ナ処理しながら実施例1と同じ偏光板を粘着剤層に積層
した。
Example 2 By the process shown in FIG. 1, Soken Chemical's adhesive SK Dyne 2003 was applied to a separator, and after drying, the adhesive surface was subjected to corona treatment under the same conditions as in Example 1. The same polarizing plate as in Example 1 was laminated on the pressure-sensitive adhesive layer.
【0040】その後、再剥離試験を行ったところ、ガラ
ス基板上への粘着剤の残りは全く見られなかった。
After that, a re-peeling test was conducted, and no residual adhesive was found on the glass substrate.
【0041】[実施例3]実施例1と同様に両面テープ
を作製し、この両面テープから片側のセパレーターを剥
離して粘着剤層を露出させ、この粘着剤層に実施例1と
同じ条件でコロナ放電処理を施すと共に、片側よりポリ
カーボネート製の位相差板を供給し、粘着剤層に位相差
板を積層した。
[Example 3] A double-sided tape was prepared in the same manner as in Example 1, the separator on one side was peeled off from the double-sided tape to expose the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer was exposed under the same conditions as in Example 1. While performing corona discharge treatment, a retardation plate made of polycarbonate was supplied from one side, and the retardation plate was laminated on the adhesive layer.
【0042】その後、再剥離試験を行ったところ、ガラ
ス基板上に粘着剤層の残りは全く見られなかった。
After that, a re-peeling test was carried out, and no residual adhesive layer was found on the glass substrate.
【0043】[比較例1]実施例1と同様に両面テープ
を作製し、この両面テープから片側のセパレーターを剥
離して粘着剤層を露出させ、この粘着剤層に片側より偏
光板を供給し、粘着剤層に偏光板を積層した。
Comparative Example 1 A double-sided tape was prepared in the same manner as in Example 1, the separator on one side was peeled off from this double-sided tape to expose the pressure-sensitive adhesive layer, and a polarizing plate was supplied to this pressure-sensitive adhesive layer from one side. A polarizing plate was laminated on the adhesive layer.
【0044】その後、再剥離試験を行ったところ、ガラ
ス基板上へ100%粘着剤層が残存した。
After that, when a re-peeling test was conducted, a 100% adhesive layer remained on the glass substrate.
【0045】[比較例2]実施例1と同様に両面テープ
を作製し、この両面テープから片側のセパレーターを剥
離して粘着剤層を露出させ、この粘着剤層にコロナ放電
処理を施した偏光板を供給し、偏光板のコロナ放電処理
を行った面を粘着剤層に積層した。
Comparative Example 2 A double-sided tape was prepared in the same manner as in Example 1, the separator on one side was peeled off from the double-sided tape to expose the pressure-sensitive adhesive layer, and the pressure-sensitive adhesive layer was subjected to corona discharge treatment to obtain polarized light. A plate was supplied, and the surface of the polarizing plate subjected to the corona discharge treatment was laminated on the pressure-sensitive adhesive layer.
【0046】その後、再剥離試験を行ったところ、ガラ
ス基板上へ90%粘着剤層が残存した。
After that, when a re-peeling test was conducted, a 90% adhesive layer remained on the glass substrate.
【0047】[0047]
【発明の効果】本発明の偏光板又は位相差板貼付用粘着
剤層の積層方法によれば、ガラス基板等の基板に偏光板
又は位相差板を粘着剤層を介して積層して液晶表示板等
を製造するに際し、偏光板や位相差板を、粘着剤をガラ
ス基板上に残さず、再剥離可能にガラス基板上に積層す
ることが可能な、偏光板又は位相差板貼付用部材を容易
かつ確実に製造することができる。
According to the method of laminating a pressure-sensitive adhesive layer for sticking a polarizing plate or a retardation plate of the present invention, a polarizing plate or a retardation plate is laminated on a substrate such as a glass substrate via the pressure-sensitive adhesive layer to provide a liquid crystal display. When manufacturing a plate, etc., a polarizing plate or a retardation plate, a member for sticking a polarizing plate or a retardation plate, which can be removably laminated on the glass substrate without leaving an adhesive on the glass substrate. It can be manufactured easily and reliably.
【図面の簡単な説明】[Brief description of drawings]
【図1】本発明方法により偏光板又は位相差板貼付用部
材を1段階で製造する工程の一例を示す説明図である。
FIG. 1 is an explanatory view showing an example of a process of manufacturing a polarizing plate or a retardation plate attaching member in one step by the method of the present invention.
【図2】本発明方法により偏光板又は位相差板貼付用部
材を2段階で製造する工程の一例を示す説明図である。
FIG. 2 is an explanatory view showing an example of a process for producing a polarizing plate or a retardation plate attaching member in two steps by the method of the present invention.
【図3】液晶ディスプレーの構成を示す断面図である。FIG. 3 is a cross-sectional view showing a configuration of a liquid crystal display.
【図4】偏光板又は位相差板貼付用部材の構成を示す断
面図である。
FIG. 4 is a cross-sectional view showing a configuration of a polarizing plate or a member for attaching a retardation plate.
【図5】ガラス基板から偏光板又は位相差板を剥す状態
を示す断面図である。
FIG. 5 is a cross-sectional view showing a state where a polarizing plate or a retardation plate is peeled off from a glass substrate.
【図6】偏光板又は位相差板貼付用部材を1段階で製造
する従来工程を示す説明図である。
FIG. 6 is an explanatory diagram showing a conventional process of manufacturing a member for sticking a polarizing plate or a retardation plate in one step.
【図7】偏光板又は位相差板貼付用部材を2段階で製造
する従来工程を示す説明図である。
FIG. 7 is an explanatory view showing a conventional process of manufacturing a polarizing plate or a member for attaching a retardation plate in two steps.
【符号の説明】[Explanation of symbols]
a 基板 b 液晶高分子 c 偏光板 d 位相差板 e 粘着剤層 f 保護フィルム g セパレーター h 偏光板又は位相差板貼付用部材 i 両面テープ 1 セパレーター巻回ロール 2 塗工機 3 乾燥機 4 セパレーター巻回ロール 5 貼付用部材巻回ロール 7 両面テープ巻回ロール 9 表面活性装置 a substrate b Liquid crystal polymer c Polarizing plate d Phase plate e Adhesive layer f Protective film g separator h Polarizing plate or retardation plate attachment member i double-sided tape 1 Separator winding roll 2 coating machine 3 dryer 4 Separator winding roll 5 Adhesive material winding roll 7 Double-sided tape winding roll 9 Surface activation device
フロントページの続き (56)参考文献 特開 昭64−17020(JP,A) 特開 平4−347802(JP,A) 特開 昭64−81913(JP,A) 特開 昭64−32203(JP,A) 特開 平5−119215(JP,A) (58)調査した分野(Int.Cl.7,DB名) G02B 5/30 Continuation of the front page (56) References JP 64-17020 (JP, A) JP 4-347802 (JP, A) JP 64-81913 (JP, A) JP 64-32203 (JP , A) JP 5-119215 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) G02B 5/30

Claims (3)

    (57)【特許請求の範囲】(57) [Claims]
  1. 【請求項1】 液晶表示板等の製造に際し、偏光板又は
    位相差板に粘着剤層を積層する粘着剤層の積層方法にお
    いて、粘着剤層の一方の面に表面活性処理を行い、該処
    理を行った粘着剤層の面に偏光板又は位相差板を貼着す
    ることを特徴とする偏光板又は位相差板貼付用粘着剤層
    の積層方法。
    1. A method for laminating a pressure-sensitive adhesive layer, which comprises laminating a pressure-sensitive adhesive layer on a polarizing plate or a retardation plate in the production of a liquid crystal display panel or the like, wherein one surface of the pressure-sensitive adhesive layer is subjected to surface activation treatment, and the treatment is performed. The method for laminating a pressure-sensitive adhesive layer for sticking a polarizing plate or a retardation plate, comprising laminating a polarizing plate or a retardation plate on the surface of the pressure-sensitive adhesive layer which has been subjected to the above step.
  2. 【請求項2】 表面活性処理が、コロナ放電処理、プラ
    ズマ処理、紫外線照射、電子線照射、アンカー剤塗布か
    ら選ばれるものである請求項1記載の偏光板又は位相差
    板貼付用粘着剤層の積層方法。
    2. The pressure-sensitive adhesive layer for sticking a polarizing plate or a retardation plate according to claim 1, wherein the surface activation treatment is selected from corona discharge treatment, plasma treatment, ultraviolet irradiation, electron beam irradiation, and anchor agent coating. Lamination method.
  3. 【請求項3】 前記粘着剤層がセパレーター上に積層さ
    れたものである請求項1又は2記載の偏光板又は位相差
    板貼付用粘着剤層の積層方法。
    3. The method for laminating a pressure-sensitive adhesive layer for sticking a polarizing plate or a retardation plate according to claim 1, wherein the pressure-sensitive adhesive layer is laminated on a separator.
JP34406793A 1993-12-17 1993-12-17 Method of laminating pressure-sensitive adhesive layer for attaching polarizing plate or retardation plate Expired - Lifetime JP3427130B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP34406793A JP3427130B2 (en) 1993-12-17 1993-12-17 Method of laminating pressure-sensitive adhesive layer for attaching polarizing plate or retardation plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP34406793A JP3427130B2 (en) 1993-12-17 1993-12-17 Method of laminating pressure-sensitive adhesive layer for attaching polarizing plate or retardation plate

Publications (2)

Publication Number Publication Date
JPH07174918A JPH07174918A (en) 1995-07-14
JP3427130B2 true JP3427130B2 (en) 2003-07-14

Family

ID=18366405

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