JP4830258B2 - Method for pasting the pressure-sensitive adhesive layer. - Google Patents

Method for pasting the pressure-sensitive adhesive layer. Download PDF

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JP4830258B2
JP4830258B2 JP2004019399A JP2004019399A JP4830258B2 JP 4830258 B2 JP4830258 B2 JP 4830258B2 JP 2004019399 A JP2004019399 A JP 2004019399A JP 2004019399 A JP2004019399 A JP 2004019399A JP 4830258 B2 JP4830258 B2 JP 4830258B2
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adhesive layer
pressure
film
sensitive adhesive
corona
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JP2005213314A (en
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俊彦 富永
周三 松本
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住友化学株式会社
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J5/00Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C09J5/02Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving pretreatment of the surfaces to be joined
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09JADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00Adhesives in the form of films or foils
    • C09J7/20Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22Plastics; Metallised plastics

Description

本発明は、液晶ディスプレー等の製造に用いられる偏光板および位相差板等の樹脂フィルムに粘着剤層を貼合する方法に関する。詳しくは樹脂フィルムを貼合する基板等よりも樹脂フィルムの方に粘着剤層をより強く密着させる粘着剤層の貼合方法に関する。   The present invention relates to a method for bonding an adhesive layer to a resin film such as a polarizing plate and a retardation plate used for production of a liquid crystal display or the like. In detail, it is related with the bonding method of the adhesive layer which adheres an adhesive layer to the direction of a resin film more strongly than the board | substrate etc. which bond a resin film.
液晶ディスプレー(以下、LCDという)等の製造に用いる偏光フィルムおよび位相差フィルムは、通常、これらのフィルムに粘着剤層を粘着し、その上に剥離フィルムを貼合し、他方のフィルム面に保護フィルムが貼合された状態として製品化されている。液晶ディスプレーを製造する際には、これらのフィルムは剥離フィルムを除き、液晶セルのガラス基板に粘着剤層を介して貼合される。
また、装飾フィルム等も粘着剤層を貼合し、その上に剥離フィルムを貼合し、他方のフィルム面に保護フィルムが貼合された状態として製品化される場合もある。この装飾フィルムを基板に貼合する際には、剥離フィルムを除き、粘着剤層を介して貼合される。
Polarizing films and retardation films used in the production of liquid crystal displays (hereinafter referred to as LCDs) usually have a pressure-sensitive adhesive layer adhered to these films, and a release film is bonded onto the film, and the other film surface is protected. It is commercialized as a state where the film is bonded. When manufacturing a liquid crystal display, these films are bonded to the glass substrate of a liquid crystal cell via an adhesive layer except for a release film.
Moreover, a decorative film etc. may also be commercialized as the state which bonded the adhesive layer, bonded the peeling film on it, and bonded the protective film on the other film surface. When this decorative film is bonded to a substrate, it is bonded via an adhesive layer except for the release film.
偏光フィルム等は枚葉に切り出して使用または製品化されるが、この取り扱い時に偏光フィルムと粘着剤層が剥がれることがある。例えば、偏光フィルムを液晶セルのガラス基板に貼合するために剥離フィルムを剥離する際に偏光フィルムと粘着剤層が剥がれることがある。また、偏光フィルムを粘着剤層を介してガラス基板に貼合した際に気泡をかみこんだり、シワが発生したりすることがあり、この場合には、一度偏光フィルムを剥離し、修正した後、再度貼り直すことがある。この場合、粘着剤層が偏光フィルムに残り、ガラス基板上に残らないことが必要である。
このようなことから、粘着剤層はガラス基板より偏光フィルムにより強く粘着していることが必要である。
A polarizing film or the like is cut into a sheet and used or commercialized, but the polarizing film and the pressure-sensitive adhesive layer may be peeled off during handling. For example, the polarizing film and the pressure-sensitive adhesive layer may be peeled off when the release film is peeled off in order to bond the polarizing film to the glass substrate of the liquid crystal cell. In addition, when the polarizing film is bonded to the glass substrate through the pressure-sensitive adhesive layer, air bubbles may be bitten or wrinkles may occur. In this case, after the polarizing film is peeled off once and corrected , You may want to paste it again. In this case, it is necessary that the pressure-sensitive adhesive layer remains on the polarizing film and does not remain on the glass substrate.
For this reason, the pressure-sensitive adhesive layer needs to adhere more strongly to the polarizing film than the glass substrate.
偏光板や位相差板により強く粘着剤層を密着させる方法として、粘着剤層の偏光板や位相差板に貼合する面にコロナ処理等の表面処理を行うことが提案されている(特許文献1参照。)。
しかしながら、粘着剤層に表面処理しただけでは不十分であり、粘着剤層をフィルムにより強く密着させる方法が望まれている。
特開平7−174918号公報
As a method for strongly adhering the pressure-sensitive adhesive layer with a polarizing plate or a retardation plate, it has been proposed to perform a surface treatment such as corona treatment on the surface of the pressure-sensitive adhesive layer to be bonded to the polarizing plate or the retardation plate (Patent Literature). 1).
However, it is not sufficient to perform a surface treatment on the pressure-sensitive adhesive layer, and a method of strongly sticking the pressure-sensitive adhesive layer to the film is desired.
JP-A-7-174918
本発明の目的は、粘着剤層を樹脂フィルムにより強く貼合させる方法を提供することにある。   An object of the present invention is to provide a method for strongly bonding a pressure-sensitive adhesive layer to a resin film.
本発明者らはかかる課題を解決するために鋭意検討した結果、樹脂フィルムおよび粘着剤層の貼合する面を表面活性化処理、特にコロナ処理することによって、粘着剤層を樹脂フィルムにより強固に密着できることを見出し、本発明を完成するに至った。
すなわち本発明は、樹脂フィルムに粘着剤層を貼合する方法において、樹脂フィルムとして偏光フィルムまたは位相差フィルムおよびアクリル系粘着剤層のそれぞれ貼合する面を樹脂フィルムまたは粘着剤層1m 当たり2〜9kJのコロナ出力でコロナ処理し、貼合することを特徴とする
As a result of intensive studies to solve such problems, the inventors of the present invention have made the pressure-sensitive adhesive layer stronger than the resin film by subjecting the surface to which the resin film and the pressure-sensitive adhesive layer are bonded to each other to surface activation treatment, particularly corona treatment. The inventors found that they can be in close contact, and completed the present invention.
That is, the present invention provides a method for bonding a pressure-sensitive adhesive layer to a resin film , wherein the polarizing film or retardation film and the acrylic pressure - sensitive adhesive layer are bonded to the surface of each of the resin film or the pressure-sensitive adhesive layer per 1 m 2 of resin film or pressure-sensitive adhesive layer. It is characterized by corona treatment and bonding with a corona output of ˜9 kJ .
本発明によって、粘着剤層を樹脂フィルムにより強く密着させることができる。このことによって、樹脂フィルムを粘着剤層を介して基板に密着するため、剥離フィルムを剥がした時に、樹脂フィルムと粘着剤層の剥離を防止することができる。また、基板との貼合時に気泡をかみこんだり、シワが発生したりした場合に剥離して貼り直す時に、粘着剤層がフィルムに残り、基板上に残らないようにすることができる。   According to the present invention, the pressure-sensitive adhesive layer can be more closely adhered to the resin film. By this, since a resin film adheres to a board | substrate via an adhesive layer, when peeling a peeling film, peeling of a resin film and an adhesive layer can be prevented. Moreover, when air bubbles are bitten at the time of bonding with the substrate or when wrinkles are generated, the pressure-sensitive adhesive layer can remain on the film and not on the substrate when it is peeled off and reattached.
本発明における樹脂フィルムとしては、液晶ディスプレー(以下、LCDという)等の製造に用いる偏光フィルム、位相差フィルム等の光学フィルム、ポリエチレンフィルム、ポリプロピレンフィルム、ポリメチルメタクリレートフィルム、ポリ塩化ビニールフィルムやこれらの装飾フィルム等が挙げられるが、これらに限定されない。   Examples of the resin film in the present invention include a polarizing film used for manufacturing a liquid crystal display (hereinafter referred to as LCD), an optical film such as a retardation film, a polyethylene film, a polypropylene film, a polymethyl methacrylate film, a polyvinyl chloride film, and the like. Although a decorative film etc. are mentioned, it is not limited to these.
粘着剤層の材料としては、アクリル系粘着剤、ゴム系粘着剤、シリコーン系粘着剤等の粘着剤が挙げられるが、これらに限定されるものではない。
これらの粘着剤は、通常、フィルム状に成形されており、その両面に剥離フィルムが貼合された状態で提供される。
Examples of the material for the pressure-sensitive adhesive layer include, but are not limited to, pressure-sensitive adhesives such as acrylic pressure-sensitive adhesives, rubber-based pressure-sensitive adhesives, and silicone-based pressure-sensitive adhesives.
These pressure-sensitive adhesives are usually formed in a film shape, and are provided in a state in which a release film is bonded to both surfaces.
表面活性化処理としてはコロナ処理、プラズマ処理等が挙げられる。
コロナ処理は、電極の間(通常、一方がロール)に高電圧をかけて放電を起こさせ、電極の間に配置した樹脂フィルムまたは粘着剤層を処理するものである。コロナ処理の効果は電極の種類、電極間隔、電圧、湿度、使用する樹脂フィルムおよび粘着剤層の種類等によって変わるが、具体的には、例えば、電極間は約2〜5mm、処理速度は約5〜20m/分で行われる。コロナ出力は樹脂フィルムまたは粘着剤層1m当たり、好ましくは約2〜9kJ、更に好ましくは約3〜7kJである。コロナ出力が約2kJより小さくなると効果が少なく、また約9kJより大きくなっても効果が少なくなる。
Examples of the surface activation treatment include corona treatment and plasma treatment.
In the corona treatment, a high voltage is applied between the electrodes (usually one is a roll) to cause discharge to treat the resin film or the adhesive layer disposed between the electrodes. The effect of corona treatment varies depending on the type of electrode, electrode spacing, voltage, humidity, type of resin film and pressure-sensitive adhesive layer used, and specifically, for example, the distance between the electrodes is about 2 to 5 mm, and the processing speed is about It is performed at 5 to 20 m / min. The corona output is preferably about 2 to 9 kJ, more preferably about 3 to 7 kJ per 1 m 2 of the resin film or pressure-sensitive adhesive layer. If the corona output is less than about 2 kJ, the effect is small, and if it is greater than about 9 kJ, the effect is small.
プラズマ処理は、0.1〜1Torrの減圧下あるいは大気圧下で発生させた不活性ガスおよび酸素ガス等のプラズマによる処理である。例えば、アルゴン等の不活性ガスに酸素を10%程度混合したガスを用い、約0.1Torrの減圧下で、周波数が13.56MHz、高周波出力が約100W、処理時間が10分の条件で行われる。   The plasma treatment is treatment with plasma of an inert gas, oxygen gas, or the like generated under a reduced pressure of 0.1 to 1 Torr or an atmospheric pressure. For example, a gas obtained by mixing about 10% of oxygen with an inert gas such as argon is used under a reduced pressure of about 0.1 Torr, a frequency of 13.56 MHz, a high frequency output of about 100 W, and a processing time of 10 minutes. Is called.
本発明において、コロナ処理等の表面活性化処理は樹脂フィルムおよび粘着剤層のそれぞれの積層する面に行う。樹脂フィルムまたは粘着剤層の一方だけでは密着性が不十分である。   In the present invention, surface activation treatment such as corona treatment is performed on the respective surfaces of the resin film and the pressure-sensitive adhesive layer. Adhesiveness is insufficient with only one of the resin film and the pressure-sensitive adhesive layer.
樹脂フィルムとして偏光フィルムを用い、表面活性化処理としてコロナ処理を行って貼合する方法の一例の概要を図1に示す。
保護フィルムが貼合された偏光フィルム(保護フィルムが外側に巻きつけられている)がロール1から繰り出される。一方、剥離フィルムが両面に貼合された粘着剤層がロール2から繰り出される。繰り出された粘着剤層のコロナ処理する側の剥離フィルムが剥がされ、剥離フィルム巻き取りロール4に巻き取られる。偏光フィルムはコロナ処理装置7、剥離フィルムの片側を剥離した粘着剤層がコロナ処理装置6でそれぞれコロナ処理され、貼合ロール5で偏光フィルム、粘着剤層のコロナ処理された面が貼合される。粘着剤層が貼合された偏光フィルム(それぞれ剥離フィルム、保護フィルムが外側に貼合されている)が巻き取りロール3に巻き取られる。
The outline | summary of an example of the method of bonding by performing a corona treatment as a surface activation process using a polarizing film as a resin film is shown in FIG.
A polarizing film on which the protective film is bonded (the protective film is wound around the outside) is fed out from the roll 1. On the other hand, the pressure-sensitive adhesive layer in which the release film is bonded to both sides is fed out from the roll 2. The release film on the side of the pressure-sensitive adhesive layer that has been subjected to corona treatment is peeled off and taken up by the release film take-up roll 4. In the polarizing film, the corona treatment device 7 and the pressure-sensitive adhesive layer from which one side of the release film is peeled are corona-treated by the corona treatment device 6, respectively, and the polarizing film and the corona-treated surface of the pressure-sensitive adhesive layer are bonded by the bonding roll 5. The A polarizing film having a pressure-sensitive adhesive layer bonded thereto (each of which has a release film and a protective film bonded to the outside) is wound on a winding roll 3.
以下、実施例を示し、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, although an Example is shown and this invention is shown concretely, this invention is not restrict | limited to the following Example.
図2に示す装置で下記のようにして偏光フィルム(スミカラン(登録商標)SRW862A-X-F住友化学工業(株)製)と粘着剤層(ノンキャリア(登録商標)P3132-2 リンテック(株)製)のコロナ処理を行い、コロナ処理した面を貼合し、粘着剤層を貼合した樹脂フィルムを作製した。
偏光フィルムの貼合面を上にして支持板9のAの位置に、粘着剤層の貼合面を上にして支持板のBの位置に貼り付け、粘着剤層の剥離フィルムを剥離した。この支持板をキャリアベルト8に載せ、10m/分のライン速度で移動しながらコロナ処理装置(春日電機(株)製)(コロナ処理電極6、7)によって偏光フィルムおよび粘着剤層のコロナ処理を行った。なお、偏光フィルムと粘着剤層のコロナ出力を変えて行う場合には、別々に行った。
コロナ処理を行った後、偏光フィルムと粘着剤層をハンドローラーを使用して貼合した。
In the apparatus shown in FIG. 2, a polarizing film (Sumikaran (registered trademark) SRW862A-XF manufactured by Sumitomo Chemical Co., Ltd.) and an adhesive layer (non-carrier (registered trademark) P3132-2 manufactured by Lintec Corporation) are used as follows. The corona treatment was performed, the corona-treated surfaces were pasted, and a resin film was pasted with an adhesive layer.
The polarizing film was attached to the position A of the support plate 9 with the bonding surface of the polarizing film up, and the adhesive film was attached to the position B of the support plate with the bonding surface of the pressure-sensitive adhesive layer up, and the release film of the pressure-sensitive adhesive layer was peeled off. The support plate is placed on the carrier belt 8 while the corona treatment device (manufactured by Kasuga Electric Co., Ltd.) (corona treatment electrodes 6 and 7) is used for corona treatment of the polarizing film and the adhesive layer while moving at a line speed of 10 m / min. went. In addition, when changing and changing the corona output of a polarizing film and an adhesive layer, it carried out separately.
After performing the corona treatment, the polarizing film and the pressure-sensitive adhesive layer were bonded using a hand roller.
粘着剤層を貼合した偏光フィルムは2日間保管し、密着性の評価テストを行った。評価テストは、粘着剤面を指先で軽く擦り偏光フィルムからの剥離状態を観察し、次の8段階で評価した。
1:全面が容易に剥離する。
2:全面が容易に剥離するが、1よりもやや強い。
3:全面が容易に剥離するが、2よりもやや強い。
4:全面が剥離する。
5:全面が剥離するが、4よりもやや強い。
6:全面が剥離するが、5よりもやや強い。
7:部分的に剥離する。
8:殆ど剥離しない。

なお、この評価テストで評価3〜8のものは、実用上、粘着剤層の剥離や、偏光フィルムの剥離時の粘着剤層残りが起こることは殆どなく、評価1および2のものはこれらの問題を起こすことがある。
コロナ出力(単位:kJ/m)を変えて行った評価結果を表1に示す。
The polarizing film on which the pressure-sensitive adhesive layer was bonded was stored for 2 days, and an adhesion evaluation test was performed. In the evaluation test, the pressure-sensitive adhesive surface was lightly rubbed with a fingertip, and the peeled state from the polarizing film was observed.
1: The entire surface peels easily.
2: The entire surface peels easily, but is slightly stronger than 1.
3: The entire surface peels easily, but slightly stronger than 2.
4: The whole surface peels.
5: The entire surface peels off, but is slightly stronger than 4.
6: The entire surface peels off, but is slightly stronger than 5.
7: Partially peels off.
8: Almost no peeling.

In this evaluation test, those with an evaluation of 3 to 8 have practically almost no peeling of the pressure-sensitive adhesive layer or the remaining of the pressure-sensitive adhesive layer at the time of peeling of the polarizing film. May cause problems.
Table 1 shows the evaluation results obtained by changing the corona output (unit: kJ / m 2 ).

どちらかをコロナ処理しない(コロナ出力が0)場合は、両方コロナ処理した場合に比べて密着性が劣っている。

When either one is not corona treated (corona output is 0), the adhesion is inferior compared to the case where both are corona treated.
粘着剤層として、ノンキャリア(登録商標)P119E(リンテック(株)製)を用いた以外は実施例1と同様に行った。評価結果を表2に示す。
実施例1と同様にどちらかをコロナ処理しない(コロナ出力が0)場合は、両方コロナ処理した場合に比べて密着性が劣っている。
The same procedure as in Example 1 was carried out except that Noncarrier (registered trademark) P119E (manufactured by Lintec Corporation) was used as the adhesive layer. The evaluation results are shown in Table 2.
As in Example 1, when either one is not corona treated (corona output is 0), the adhesion is inferior compared to the case where both are corona treated.
樹脂フィルムとして位相差フィルム(スミカイト(登録商標)KSEES440108Z-F 住友化学工業(株)製)を用いた以外は実施例1と同様に行った。評価結果を表3に示す。
実施例1と同様にどちらかをコロナ処理しない(コロナ出力が0)場合は、両方コロナ処理した場合に比べて密着性が劣っている。
The same procedure as in Example 1 was performed except that a retardation film (Sumikite (registered trademark) KSEES440108Z-F manufactured by Sumitomo Chemical Co., Ltd.) was used as the resin film. The evaluation results are shown in Table 3.
As in Example 1, when either one is not corona treated (corona output is 0), the adhesion is inferior compared to the case where both are corona treated.
樹脂フィルムと粘着剤層をコロナ処理して貼合する方法の一例の概要を示す図である。It is a figure which shows the outline | summary of an example of the method of corona-treating and bonding a resin film and an adhesive layer. 実施例で行った方法を示す図である。It is a figure which shows the method performed in the Example.
符号の説明Explanation of symbols
1 偏光フィルム繰り出しロール
2 粘着剤層繰り出しロール
3 巻き取りロール
4 剥離フィルム巻き取りロール
5 貼合ロール
6 コロナ処理電極
7 コロナ処理電極
8 キャリアベルト
9 支持板

DESCRIPTION OF SYMBOLS 1 Polarizing film feeding roll 2 Adhesive layer feeding roll 3 Winding roll 4 Release film winding roll 5 Bonding roll 6 Corona treatment electrode 7 Corona treatment electrode 8 Carrier belt 9 Support plate

Claims (1)

  1. 樹脂フィルムに粘着剤層を貼合する方法において、樹脂フィルムとして偏光フィルムまたは位相差フィルムおよびアクリル系粘着剤層のそれぞれ貼合する面を樹脂フィルムまたは粘着剤層1m 当たり2〜9kJのコロナ出力でコロナ処理し、貼合することを特徴とする粘着剤層の貼合方法。 In the method of bonding the pressure - sensitive adhesive layer to the resin film , corona output of 2 to 9 kJ per 1 m 2 of the resin film or pressure-sensitive adhesive layer is used as the surface of the polarizing film or retardation film and the acrylic pressure - sensitive adhesive layer as the resin film. A method of laminating a pressure-sensitive adhesive layer, characterized by corona treatment and laminating.
JP2004019399A 2004-01-28 2004-01-28 Method for pasting the pressure-sensitive adhesive layer. Active JP4830258B2 (en)

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JP2004019399A JP4830258B2 (en) 2004-01-28 2004-01-28 Method for pasting the pressure-sensitive adhesive layer.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2004019399A JP4830258B2 (en) 2004-01-28 2004-01-28 Method for pasting the pressure-sensitive adhesive layer.
TW94100591A TWI467294B (en) 2004-01-28 2005-01-10 A method for laminating an adhesive layer
KR1020050006291A KR101177328B1 (en) 2004-01-28 2005-01-24 A method for laminating an adhesive layer
CNB2005100063228A CN100513502C (en) 2004-01-28 2005-01-26 Laminating method for adhesive layer

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