JP2006143961A - Pressure-sensitive adhesive sheet with separator, optical component assembly and method for producing the same - Google Patents
Pressure-sensitive adhesive sheet with separator, optical component assembly and method for producing the same Download PDFInfo
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Abstract
Description
本発明は、セパレータ付き感圧型接着シート、光学部材組立体及びその製造方法であり、特に板状やシート状の光学部材を貼り合わせるときに用いられ、巻物状態からの横ズレ防止性、貼り合せ時の作業性、接着剤層の透明性、貼り付け後の均一透過性に優れ、更に、安価に製造できる感圧型接着シートに関する。 The present invention is a pressure-sensitive adhesive sheet with a separator, an optical member assembly, and a method for manufacturing the same, and is particularly used when laminating plate-like or sheet-like optical members. The present invention relates to a pressure-sensitive adhesive sheet that is excellent in workability at the time, transparency of an adhesive layer, and uniform permeability after application, and can be manufactured at low cost.
液晶表示装置（ＬＣＤ）、プラズマディスプレイ（ＰＤＰ）、プロジェクションスクリーン（ＰＪ）、ブラウン管（ＣＲＴ）等のディスプレイ製品には、様々な板状、シート状の光学部材が数多く使用されている。これらの光学部材は、光学部材間の光散乱による光ロス低減の為、製品組立て時の効率アップの為、製品の強度保持の為などの目的で、透明な接着剤で光学部材間を接着することが行われている。例えば、ＬＣＤでは偏光板と液晶セルの接着、アンチリフレクション（ＡＲ）フィルムと偏光板の接着、ＰＤＰではＡＲフィルム、電磁シールドフィルム、近赤外吸収（ＮＩＲ）フィルム等の接着、ＣＲＴではＡＲフィルムやアンチグレア（ＡＧ）フィルムとブラウン管との接着等が行われている。
このような接着剤としては、感圧型接着剤、感熱型接着剤、紫外線（ＵＶ）硬化型接着剤等が開発されているが、貼付ける際の設備投資が比較的少なくすむ感圧型接着剤が最も広く普及している。
A variety of plate-like and sheet-like optical members are used in display products such as a liquid crystal display (LCD), a plasma display (PDP), a projection screen (PJ), and a cathode ray tube (CRT). These optical members are bonded to each other with a transparent adhesive for the purpose of reducing the optical loss due to light scattering between the optical members, increasing the efficiency during product assembly, and maintaining the strength of the product. Things have been done. For example, for LCDs, the polarizing plate and the liquid crystal cell are bonded, for the anti-reflection (AR) film and the polarizing plate, for the PDP, an AR film, an electromagnetic shielding film, a near infrared absorption (NIR) film, etc., for the CRT, an AR film, Adhesion between an anti-glare (AG) film and a cathode ray tube is performed.
As such adhesives, pressure-sensitive adhesives, heat-sensitive adhesives, ultraviolet (UV) curable adhesives, and the like have been developed, but pressure-sensitive adhesives that require relatively little capital investment for application are available. Most widely used.
また、光学部材表面への接着剤層の形成方法としては、液状の接着剤を直接光学部材表面へ塗布する方法と予めセパレータフィルム上に形成しておいた接着シートを光学部材表面にラミネート転写する方法がある。液状の接着剤を直接塗布する方法は、接着剤自体が安価であるものの、塗布作業時に作業環境を汚染する（特に有機溶剤型接着剤を塗布する場合は、有機溶剤対策が必要となる）、厚み精度の良い接着剤層を形成するのが難しい、液状接着剤を塗布するため光学部材にダメージを与え易い等といった問題がある。一方、接着シートをラミネート転写する方法は、接着シート自体が比較的高価であり直接塗布する方法に比べコストは高くなり易いが、作業環境の汚染が少ない、接着するのに大掛かりな設備が必要ないといった特長もあり、２つの方式の特長に合わせて使い分けられている。 In addition, as a method of forming an adhesive layer on the surface of the optical member, a method in which a liquid adhesive is directly applied to the surface of the optical member and an adhesive sheet previously formed on a separator film are laminated and transferred to the surface of the optical member. There is a way. The method of directly applying a liquid adhesive, although the adhesive itself is inexpensive, contaminates the work environment during the application work (especially when applying an organic solvent type adhesive, an organic solvent countermeasure is required) There are problems that it is difficult to form an adhesive layer with good thickness accuracy and that the optical member is easily damaged due to the application of a liquid adhesive. On the other hand, the method of laminating and transferring the adhesive sheet is relatively expensive and the cost is likely to be higher than the method of direct application, but there is little contamination of the working environment and no large equipment is required for bonding. There are also features such as, and they are properly used according to the features of the two methods.
接着シートにおいての接着剤層の形成方法としては、プラスチックセパレータ上に有機溶剤に溶解し粘度を調整した接着剤を塗布する方法が一般的に知られている。この場合、生産性や２次加工性の面から接着剤を塗布した後に搬送乾燥し、その後、巻物状とする方法が一般的に知られている。接着剤の搬送方式による乾燥工程は、張力と熱が加わる為にセパレータが熱収縮などの変形を引き起こす要因の一つとなる。変形したセパレータ上の接着剤層と光学部材を貼り合わせると、貼り合わせ時のシワ、歪みが発生し、貼り合わせ後の光透過性も均一では無くなり、光学特性における欠陥となってしまう問題があった。 As a method for forming an adhesive layer in an adhesive sheet, a method of applying an adhesive having a viscosity adjusted by dissolving in an organic solvent on a plastic separator is generally known. In this case, a method is generally known in which from the viewpoint of productivity and secondary processability, an adhesive is applied and then dried by transporting, and then formed into a scroll. The drying process based on the adhesive transport system is one of the factors that cause deformation such as thermal shrinkage of the separator due to the application of tension and heat. When the adhesive layer on the deformed separator and the optical member are bonded together, there is a problem that wrinkles and distortion occur at the time of bonding, and the light transmittance after bonding is not uniform, resulting in defects in optical characteristics. It was.
プラスチックフィルムの収縮を低減する技術に、ポリステルフィルムに予め低張力での高温加熱処理を加える技術がある。この技術を用いたプラスチックフィルムは、２次加工時の寸法変化や経時的な寸法変化を軽減することが可能である。しかし、プラスチックセパレータの変形を抑えることができても、歪みやうねり等に対する効果としては軽減はできるが充分ではなく、その歪みやうねり等は光学部材との貼り合わせ後における光透過時のムラとなってしまい、光学特性に必要な均一透過性が得られなくなってしまう問題があった。 As a technique for reducing the shrinkage of a plastic film, there is a technique in which a high-temperature heat treatment at a low tension is previously applied to a polyester film. Plastic films using this technology can reduce dimensional changes during secondary processing and dimensional changes over time. However, even if the deformation of the plastic separator can be suppressed, the effect on distortion and undulation can be reduced, but it is not sufficient, and the distortion and undulation are caused by unevenness in light transmission after bonding with an optical member. As a result, there is a problem that uniform transparency required for optical characteristics cannot be obtained.
一方、これまでに述べた感圧型接着シートとしては、２枚のプラスチックセパレータの間に感圧型接着剤層を形成した接着シートが一般的に使用されている（例えば、下記特許文献参照）。 On the other hand, as the pressure-sensitive adhesive sheet described so far, an adhesive sheet in which a pressure-sensitive adhesive layer is formed between two plastic separators is generally used (for example, refer to the following patent document).
プラスチックフィルムにおいて、離型処理後は通常巻物状として保管され、２次加工へと進むが、その際、巻物状として保管されたプラスチックセパレータの離型剤が背面側へ転着する現象が起こることが知られている。接着シートは、プラスチックセパレータに接着剤を塗布、乾燥後に巻物状として保管するのが一般的であるが、その際に、感圧型接着剤層を挟む２枚のプラスチックセパレータにおいて、離型剤が転着した各プラスチックセパレータの背面同士が接触するため非常に滑り易い状態になり、外的な衝撃が加わった場合、例えば運搬時等において巻物が横ズレを引き起こす原因となってしまう。横ズレを起こした接着シートは、感圧型接着剤層にシワ、打痕、凹み、歪み等の変形を発生させ、結果として、光学部材との貼り合わせ後の光学特性における欠陥となってしまう問題があった。 In a plastic film, after release processing, it is usually stored as a scroll and proceeds to the secondary processing. At that time, a phenomenon occurs in which the release agent of the plastic separator stored as a scroll is transferred to the back side. It has been known. The adhesive sheet is generally applied to a plastic separator and then stored as a roll after drying. At that time, the release agent is transferred to the two plastic separators sandwiching the pressure-sensitive adhesive layer. Since the back surfaces of the respective plastic separators are in contact with each other, they are in a very slippery state, and when an external impact is applied, the scroll causes a lateral shift, for example, during transportation. The adhesive sheet that has undergone lateral misalignment causes deformation such as wrinkles, dents, dents, and distortions in the pressure-sensitive adhesive layer, resulting in defects in optical properties after being bonded to the optical member. was there.
近年のディスプレイ表示精度の向上により、巻物状態での横ズレが防止でき、貼付け作業性に優れ、光学部材に貼り合せた時の光学特性に影響を与える透明性や均一透過性等における欠陥が極めて少なく、更に、安価に製造ができる接着シートが求められている。
本発明は、かかる従来の技術で述べたような欠点を解消し、巻物状態からの横ズレ防止性、光学部材貼り合せ時の貼付け作業性に優れ、貼付け後の透過性、均一透過性等において、良好な光学特性が実現でき、更に、安価に製造できるセパレータ付き感圧型接着シート及び光学部材組立体並びにその製造方法を提供することを目的とする。 The present invention eliminates such drawbacks as described in the prior art, is excellent in prevention of lateral displacement from the roll state, excellent in workability when pasting optical members, and has excellent permeability and uniform permeability after pasting. Another object of the present invention is to provide a pressure-sensitive adhesive sheet with a separator, an optical member assembly, and a method for manufacturing the same, which can realize good optical characteristics and can be manufactured at low cost.
本発明は、光学部材を貼り合わせる感圧型接着剤層をプラスチックセパレータのＡ面に設け、更に、巻物状とし、プラスチックセパレータのＢ面に感圧型接着剤層が接触するセパレータ付き感圧型接着シートにおいて、前記プラスチックセパレータの感圧型接着剤層からの剥離力がＡ面、Ｂ面共に１００ｍＮ／２５ｍｍ以下、Ａ面とＢ面の剥離力の差が１０ｍＮ／２５ｍｍ以上であり、且つ前記プラスチックセパレータを１００℃−３０分の加熱処理へ投入した際のＭＤ方向とＴＤ方向の加熱収縮率が共に±１．０％以内で、且つＭＤ方向とＴＤ方向の加熱収縮率の差が０．５％以内であり、そして、感圧型接着剤層の全光線透過率が８０％以上であるセパレータ付き感圧型接着シートである。
そして、本発明は、上記感圧型接着剤層のアクリル板への接着力が１Ｎ／２５ｍｍ以上であるセパレータ付き感圧型接着シートである。
The present invention provides a pressure-sensitive adhesive sheet with a separator in which a pressure-sensitive adhesive layer for bonding an optical member is provided on the A side of a plastic separator, and is further wound, and the pressure-sensitive adhesive layer contacts the B side of the plastic separator. The peeling force of the plastic separator from the pressure-sensitive adhesive layer is 100 mN / 25 mm or less for both the A and B surfaces, the difference in peeling force between the A and B surfaces is 10 mN / 25 mm or more, and the plastic separator is 100 When the heat shrinkage rate in the MD direction and the TD direction is both within ± 1.0% and the difference in the heat shrinkage rate between the MD direction and the TD direction is within 0.5%. And a pressure-sensitive adhesive sheet with a separator in which the total light transmittance of the pressure-sensitive adhesive layer is 80% or more.
And this invention is a pressure sensitive adhesive sheet with a separator whose adhesive force to the acrylic board of the said pressure sensitive adhesive layer is 1 N / 25mm or more.
更に、本発明は、接着剤層が架橋型アクリル系接着剤であるセパレータ付き感圧型接着シートである。 Furthermore, the present invention is a pressure-sensitive adhesive sheet with a separator whose adhesive layer is a cross-linked acrylic adhesive.
また、本発明は、上記プラスチックセパレータにおけるＡ面、Ｂ面の表面粗さＲａが共に０．１μｍ以下であるセパレータ付き感圧型接着シートである。
そして、本発明は、幅両端面上に１ｍｍ〜５０ｍｍの接着剤層の無い部分を設けてなるセパレータ付き感圧型接着シートである。
Moreover, this invention is a pressure-sensitive adhesive sheet with a separator whose surface roughness Ra of A surface and B surface in the said plastic separator is 0.1 micrometer or less.
And this invention is a pressure-sensitive adhesive sheet with a separator which provides a part without the adhesive layer of 1 mm-50 mm on the width | variety both end surfaces.
また、本発明は、光学部材を貼り合せて組立てた光学部材組立体であって、上記のセパレータ付き感圧型接着シートにおいて、プラスチックセパレータを剥離した感圧型接着剤層により接着されている光学部材組立体である。 The present invention also relates to an optical member assembly assembled by bonding optical members, wherein the optical member assembly is bonded to the pressure-sensitive adhesive sheet with a separator by a pressure-sensitive adhesive layer from which a plastic separator is peeled off. It is a solid.
そして、本発明は、光学部材を貼り合わせた光学部材組立体を組立てる方法であって、上記のセパレータ付き感圧型接着シートにおいて、プラスチックセパレータのＡ面、Ｂ面の内、剥離力の弱い面を剥離した感圧型接着剤層と第２の光学部材とを接着させて組立てる光学部材組立体の製造方法である。 And this invention is a method of assembling the optical member assembly which affixed the optical member, Comprising: In said pressure-sensitive adhesive sheet with a separator, among the A surface and B surface of a plastic separator, a surface with weak peeling force is provided. This is a method of manufacturing an optical member assembly in which the peeled pressure-sensitive adhesive layer and the second optical member are bonded and assembled.
本発明によれば、巻物状からの横ズレ防止性に優れ、貼り付け時に容易に接着剤層が転写できる貼り付け作業性に優れ、貼り付け後には、透明性、均一透過性等の光学特性における良好な貼り合わせ外観が実現でき、更に、安価に製造できる感圧型接着シート及び光学部剤組立体を得ることができる。 According to the present invention, it is excellent in prevention of lateral deviation from the scroll shape, excellent in workability for attaching the adhesive layer easily at the time of sticking, and after sticking, optical properties such as transparency and uniform transparency. Thus, a pressure-sensitive adhesive sheet and an optical part assembly that can be manufactured at low cost can be obtained.
本発明の実施の形態を説明する。
以下、本発明のセパレータ付き感圧型接着シートについて具体的に説明する。
本発明のセパレータ付き感圧型接着シートは、プラスチックセパレータのＡ面に感圧型接着剤層を設け、更に、巻物状としプラスチックセパレータのＢ面に感圧型接着剤層が接触する形態である。
プラスチックセパレータは離型処理後、巻物として保管され、その後２次加工に使用されるが、その巻物状での保管時において離型処理面と背面が接触する為に、プラスチックセパレータの背面側へ離型剤が転写する。一般的な構成である２枚のプラスチックセパレータの間に感圧型接着剤層を形成し、巻物状とした場合、各プラスチックセパレータの背面同士が接触する為に、非常に滑り易く、運搬等の際に外的な衝撃を受けると横ズレが起きる。巻物状から横ズレを起こした接着シートは、感圧型接着剤層にシワ、打痕、凹み、歪み等の変形を発生させ、光学部材との貼り合わせ時に横ズレを補正する為の条件変更等の作業性悪化、さらには、変形した接着剤層により貼り合わせ後の光学特性に必要な均一透過性等が得られなくなるといった問題が発生する。本発明のように、１枚のプラスチックセパレータの両面に感圧型接着剤層が接触する形態であれば、前記問題は発生せず、且つ、使用するセパレータが1枚の為、製造コストを低減できる。
An embodiment of the present invention will be described.
Hereinafter, the pressure-sensitive adhesive sheet with a separator of the present invention will be specifically described.
The pressure-sensitive adhesive sheet with a separator of the present invention is a form in which a pressure-sensitive adhesive layer is provided on the A side of a plastic separator, and is further formed in a roll shape so that the pressure-sensitive adhesive layer is in contact with the B side of the plastic separator.
The plastic separator is stored as a scroll after the mold release treatment, and is then used for secondary processing. However, since the release processing surface and the back surface are in contact with each other during storage in the form of a scroll, the plastic separator is separated to the back side of the plastic separator. The mold is transferred. When a pressure-sensitive adhesive layer is formed between two plastic separators, which is a common structure, and made into a roll, the back surfaces of the plastic separators are in contact with each other. Lateral misalignment occurs when an external shock is received. Adhesive sheet that has undergone lateral displacement from the scroll shape causes deformation such as wrinkles, dents, dents, and distortion in the pressure-sensitive adhesive layer, and changes in conditions to correct lateral displacement when bonded to optical members, etc. In addition, there is a problem that the workability deteriorates, and the uniform transparency necessary for the optical characteristics after bonding cannot be obtained due to the deformed adhesive layer. If the pressure-sensitive adhesive layer is in contact with both surfaces of a single plastic separator as in the present invention, the above problem does not occur, and the manufacturing cost can be reduced because only one separator is used. .
そして、本発明に用いるプラスチックセパレータは、１００℃−３０分の加熱処理へ投入した際のＭＤ方向とＴＤ方向の加熱収縮率が共に±１．０％以内で、且つＭＤ方向とＴＤ方向の加熱収縮率の差が０．５％以内である。ＭＤ、ＴＤ各方向への収縮率が±１．０％より大きい場合、セパレータの持つひずみが大きい為、光学部材貼り合わせ時にシワが発生する。このシワが接着剤層の凹凸形状となり光学部材貼り合わせ後における光透過時に均一性を損なわせ外観欠陥となる。ＭＤ方向とＴＤ方向の加熱収縮率が共に±１．０％以内で、ＭＤ方向とＴＤ方向の加熱収縮率の差が０．５％より大きい場合、セパレータのＭＤ方向とＴＤ方向の加熱収縮率の差により光学部材貼り合わせ時に歪みが発生する。この歪みが光学部材貼り合わせ後における光透過時にムラとなり、光透過の均一性が得られず外観欠陥となる。ＭＤ方向とＴＤ方向の加熱収縮率が共に±１．０％以内で、ＭＤ方向とＴＤ方向の加熱収縮率の差が０．５％以内の場合、セパレータの加熱収縮率が小さく、ＭＤ方向とＴＤ方向の加熱収縮率差も小さい為、光学部材貼り合わせ時のシワや歪みの発生を抑制することができ、光学部材貼り合わせ後の光透過時において均一性を保ち、良好な光学特性を得ることが可能となる。ここでの加熱収縮率はセパレータを１２０ｍｍ角に切りだし、ＭＤ、ＴＤ各方向における１００ｍｍ長さの各直線中心が交差する点が１２０ｍｍ角の中央になるようにし、その直線のＭＤ方向の線の両端、ＴＤ方向の線の両端にそれぞれ印を付け、そのＭＤ、ＴＤ各方向の点間距離を測定距離とする。１００℃中に３０分間投入後の点間距離を測定し、ＭＤ、ＴＤ各方向の距離の変化を加熱収縮率とした。 The plastic separator used in the present invention has both the MD shrinkage in the MD direction and the TD direction within ± 1.0% when heated to 100 ° C. for 30 minutes, and the heating in the MD direction and the TD direction. The difference in shrinkage is within 0.5%. When the shrinkage rate in each direction of MD and TD is greater than ± 1.0%, the separator has a large strain, and thus wrinkles are generated when the optical member is bonded. This wrinkle becomes an uneven shape of the adhesive layer, and the uniformity is lost during light transmission after the optical member is bonded, resulting in an appearance defect. When both the MD shrinkage in the MD direction and the TD direction are within ± 1.0% and the difference between the heat shrinkage in the MD direction and the TD direction is greater than 0.5%, the heat shrinkage in the MD direction and the TD direction of the separator. Due to the difference, distortion occurs when the optical member is bonded. This distortion becomes uneven at the time of light transmission after the optical member is bonded, and light transmission uniformity cannot be obtained, resulting in an appearance defect. When the heat shrinkage in the MD direction and the TD direction are both within ± 1.0% and the difference between the heat shrinkage in the MD direction and the TD direction is within 0.5%, the heat shrinkage of the separator is small. Since the difference in the heat shrinkage rate in the TD direction is also small, it is possible to suppress the occurrence of wrinkles and distortions when bonding optical members, and to maintain good uniformity during light transmission after bonding optical members and to obtain good optical characteristics. It becomes possible. Here, the heat shrinkage rate is obtained by cutting the separator into 120 mm squares, and making the point where the straight line centers of 100 mm length in the MD and TD directions intersect each other become the center of the 120 mm square, Mark both ends and both ends of the line in the TD direction, and let the distance between points in the MD and TD directions be the measurement distance. The point-to-point distance was measured after 30 minutes in 100 ° C, and the change in distance in each direction of MD and TD was defined as the heat shrinkage rate.
本発明に用いるプラスチックセパレータにおいて、Ａ面、Ｂ面の接着剤層からの剥離力は共に１００ｍＮ／２５ｍｍ以下である。１００ｍＮ／２５ｍｍより剥離力が高いと、光学部材に接着シートを貼り付ける際、巻物状からの巻き出し作業性やセパレータの剥離作業性が悪化し、プラスチックセパレータのスムーズな剥離ができず接着剤層に折れシワを発生させ、また、剥離工程を途中で止め、再度剥離工程に入る際に、接着剤層に止め跡などの段差が発生し、光学部材に貼り付けた時にその変形が残留し外観欠陥になる、貼り合わせ時に気泡が混入し易くなるといった問題が発生する。ここでの剥離力は、剥離角度１８０度、剥離速度１ｍ／分、室温にて測定した値である。 In the plastic separator used in the present invention, the peeling forces from the adhesive layers on the A and B sides are both 100 mN / 25 mm or less. When the peeling force is higher than 100 mN / 25 mm, when the adhesive sheet is attached to the optical member, the unwinding workability from the scroll shape and the peeling workability of the separator deteriorate, and the plastic separator cannot be peeled smoothly and the adhesive layer. In addition, when the peeling process is stopped halfway and re-entering the peeling process, a step such as a stop mark occurs in the adhesive layer, and the deformation remains when attached to an optical member. The problem that it becomes a defect and a bubble becomes easy to mix at the time of bonding occurs. The peeling force here is a value measured at room temperature at a peeling angle of 180 degrees, a peeling speed of 1 m / min.
また、本発明に用いるプラスチックセパレータの両面の接着剤層からの剥離力の差は、１０ｍＮ／２５ｍｍ以上である。１０ｍＮ／２５ｍｍ未満であると、光学部材に接着シートを貼り付ける際に巻物状から巻き出した時に、プラスチックセパレータの接着剤層を剥がそうとした面に接着剤層が付着し、プラスチックセパレータ上に平滑で外観が良い状態の接着剤層が残留しない現象（泣き別れ現象）が発生する。この泣き別れ現象が発生すると、接着剤層を光学部材に平滑に貼り付けることができず、光学部材を外観良く貼り合わせることができない。ここでの剥離力は、剥離角度１８０度、剥離速度１ｍ／分、室温にて測定した値である。 Moreover, the difference of the peeling force from the adhesive layer of both surfaces of the plastic separator used for this invention is 10 mN / 25mm or more. When the adhesive sheet is less than 10 mN / 25 mm, when the adhesive sheet is applied to the optical member, the adhesive layer adheres to the surface on which the adhesive layer of the plastic separator is to be peeled off and is placed on the plastic separator. The phenomenon that the adhesive layer in a smooth and good appearance does not remain (crying phenomenon) occurs. When this tear-off phenomenon occurs, the adhesive layer cannot be applied smoothly to the optical member, and the optical member cannot be attached with good appearance. The peeling force here is a value measured at room temperature at a peeling angle of 180 degrees, a peeling speed of 1 m / min.
本発明に用いるプラスチックセパレータの感圧型接着剤層に接触するＡ面、Ｂ面の表面粗さＲａは共に０．１μｍ以下である。表面粗さＲａが０．１μｍより大きくなると、セパレータ表面の粗さが接着剤層へ転写し、接着剤層面の平滑性が悪化し、貼り合わせ時に気泡が混入し易くなるといった問題が発生する。ここでの表面粗さは、接触型表面粗さ計（例えば、株式会社小坂研究所製、測定装置ＳＥ−３Ｃ、解析装置ＡＹ−２２）で測定した中心線平均粗さ（Ｒａ）又は、ＪＩＳ Ｂ ０６０１（１９９４年）若しくは、ＪＩＳ Ｂ ０６０１（２００１年）で定義される算術平均粗さ（Ｒａ）を意味する。 The surface roughness Ra of the A side and the B side contacting the pressure-sensitive adhesive layer of the plastic separator used in the present invention is 0.1 μm or less. When the surface roughness Ra is larger than 0.1 μm, the roughness of the separator surface is transferred to the adhesive layer, the smoothness of the adhesive layer surface is deteriorated, and there is a problem that bubbles are easily mixed during bonding. The surface roughness here is the center line average roughness (Ra) measured with a contact-type surface roughness meter (for example, measuring device SE-3C, analysis device AY-22 manufactured by Kosaka Laboratory Ltd.) or JIS. B 0601 (1994) or arithmetic mean roughness (Ra) defined by JIS B 0601 (2001).
このプラスチックセパレータの基材材質としては、例えば、ポリエステルフィルム、ポリプロピレンフィルム、ポリエチレンフィルム、ポリカーボネートフィルム、ポリスチレンフィルム、ポリイミドフィルム、トリアセチルセルロースフィルム等を挙げることができる。これらの中で、平滑な表面が得易く生産性に優れる二軸延伸ポリエステルフィルムが好ましく使用できる。 Examples of the base material of the plastic separator include a polyester film, a polypropylene film, a polyethylene film, a polycarbonate film, a polystyrene film, a polyimide film, and a triacetyl cellulose film. Among these, a biaxially stretched polyester film that is easy to obtain a smooth surface and excellent in productivity can be preferably used.
また、このプラスチックセパレータの接着材層と接する面には離型剤処理を行っている。この離型剤としては、シリコーン樹脂、フッ素樹脂、ポリビニルアルコール樹脂、アルキル基を有する
樹脂等の単体や変性体、混合物等が挙げられる。その中で、接着剤層の軽剥離が容易に得ることができるシリコーン樹脂が好ましく使用でき、特に熱や紫外線、電子線等で硬化したシリコーン樹脂は、接着剤層へのシリコーン樹脂の転着が少ない等の理由からより好ましく使用できる。
In addition, a release agent treatment is performed on the surface of the plastic separator in contact with the adhesive layer. Examples of the releasing agent include simple substances such as silicone resins, fluororesins, polyvinyl alcohol resins, and resins having an alkyl group, modified products, and mixtures. Among them, a silicone resin that can easily be easily peeled off from the adhesive layer can be preferably used. Particularly, a silicone resin cured by heat, ultraviolet rays, electron beams, etc. can transfer the silicone resin to the adhesive layer. It can be more preferably used for the reason of few.
プラスチックセパレータの厚さとしては、１０〜２００μｍが好ましく用いられる。更に好ましくは、２０〜７５μｍである。１０μｍより薄いとフィルム強度が不足し、接着シート製造時にフィルムが破れる、シワが入り易い等の問題が発生する。また、２００μｍより厚いとフィルム自体が高価になる等の問題が発生する。 The thickness of the plastic separator is preferably 10 to 200 μm. More preferably, it is 20-75 micrometers. If the thickness is less than 10 μm, the film strength is insufficient, and problems such as tearing of the film during the production of the adhesive sheet, and easy wrinkling occur. On the other hand, if it is thicker than 200 μm, the film itself becomes expensive.
更に、このプラスチックセパレータには、必要に応じてプラスチックフィルム表面に離型剤層との密着力を向上するために、コロナ処理、プラズマ処理といった表面処理や下塗り剤（プライマ）の塗布等を行ってもよい。また、必要に応じて静電気発生を防止する目的で帯電防止剤の塗布を行ってもよい。ここでの帯電防止剤としては、例えば、第４級アンモニウム塩、ピリジウム塩、第１〜３級アミノ基等のカチオン性基を有する各種カチオン性帯電防止剤、スルホン酸塩基、硫酸エステル基、リン酸エステル基等のアニオン性基を有するアニオン系帯電防止剤、アミノ酸系、アミノ硫酸エステル系等の両性帯電防止剤、アミノアルコール系、グリセリン系、ポリエチレングリコール系等のノニオン性帯電防止剤等の各種帯電防止剤、更には、これらの帯電防止剤を高分子量化した高分子型帯電防止剤等が挙げられる。 Furthermore, this plastic separator is subjected to surface treatment such as corona treatment or plasma treatment or application of a primer (primer) to improve the adhesion of the release agent layer to the surface of the plastic film as necessary. Also good. Moreover, you may apply | coat an antistatic agent in order to prevent static electricity generation as needed. Examples of the antistatic agent herein include various cationic antistatic agents having a cationic group such as a quaternary ammonium salt, a pyridium salt, and a primary to tertiary amino group, a sulfonate group, a sulfate ester group, and phosphorus. Various types of anionic antistatic agents having an anionic group such as acid ester groups, amphoteric antistatic agents such as amino acid type and aminosulfate ester type, nonionic antistatic agents such as amino alcohol type, glycerin type and polyethylene glycol type Examples thereof include antistatic agents, and polymer antistatic agents obtained by increasing the molecular weight of these antistatic agents.
本発明のセパレータ付き感圧型接着シートは高い透明性を有しており、全光線透過率が８０％以上である。より好ましくは９０％以上である。全光線透過率が８０％より低いと光学部材を貼り合わせた時の光透過性が悪く、ディスプレイが暗くなったり、コントラストが落ちるといった問題が発生する。ここでの全光線透過率は、プラスチックセパレータを剥がし接着剤層のみの状態で、ＪＩＳ−Ｋ７１０５に準じ、積分球式濁度計（日本電色工業株式会社製、ＮＤＨ２０００）により測定した。 The pressure-sensitive adhesive sheet with a separator of the present invention has high transparency and a total light transmittance of 80% or more. More preferably, it is 90% or more. When the total light transmittance is lower than 80%, the light transmittance when the optical member is bonded is poor, and there arises a problem that the display becomes dark or the contrast is lowered. The total light transmittance here was measured with an integrating sphere turbidimeter (Nippon Denshoku Industries Co., Ltd., NDH2000) in accordance with JIS-K7105 with the plastic separator peeled off and only the adhesive layer.
本発明のセパレータ付き感圧型接着シートにおける接着剤層は、感圧型接着剤であり、アクリル板に貼り付けた時の接着力が１Ｎ／２５ｍｍ以上である。１Ｎ／２５ｍｍ未満の場合には、光学部材に対し充分な接着力が得られず剥れ等の問題が発生する。ここでのアクリル板に対する接着力は、巻き出した接着シートをアクリル（住友化学工業製スミぺックＥ０００、厚み１．５ｍｍフラット板）に圧力５８８０Ｎ／ｍをかけたゴムロールを用い２ｍ／分の速度で貼り付け、プラスチックセパレータを剥がし同様条件にて２５μｍＰＥＴフィルム（ユニチカ製Ｓ−２５）を貼り付けて試験片を作製し、更に３０分間室温放置し、その後、剥離角度１８０度、剥離速度０．３ｍ／分、室温にて接着力を測定した値である。 The adhesive layer in the pressure-sensitive adhesive sheet with a separator of the present invention is a pressure-sensitive adhesive, and has an adhesive force of 1 N / 25 mm or more when attached to an acrylic plate. If it is less than 1 N / 25 mm, sufficient adhesive strength cannot be obtained for the optical member, causing problems such as peeling. The adhesive strength with respect to the acrylic plate here is 2 m / min using a rubber roll in which the pressure-sensitive adhesive sheet is subjected to a pressure of 5880 N / m on acrylic (Sumitec E000 manufactured by Sumitomo Chemical Co., Ltd., thickness 1.5 mm flat plate). At a speed, the plastic separator was peeled off, and a 25 μm PET film (S-25 manufactured by Unitika) was attached under the same conditions to prepare a test piece. The test piece was further allowed to stand at room temperature for 30 minutes. It is the value which measured the adhesive force at 3 m / min and room temperature.
この感圧型接着剤としては、接着剤とし一般的に用いられる、各種アクリルモノマーを共重合して得られるアクリル系接着剤、天然ゴム系接着剤、ポリイソブチレン、ブチルゴム、スチレン−ブチレン−スチレン共重合体（ＳＢＳ）等の合成ゴム系接着剤、エチレン−酢酸ビニル共重合体（ＥＶＡ）系接着剤等、及び、これらの混合系接着剤を使用することができる。この中で特に、接着シートの全光線透過率が８０％以上になるような高透明接着剤が得易いなどの理由から架橋型アクリル系接着剤が好適に用いられる。 As this pressure-sensitive adhesive, acrylic adhesives obtained by copolymerizing various acrylic monomers, natural rubber adhesives, polyisobutylene, butyl rubber, styrene-butylene-styrene copolymer, which are generally used as adhesives, are used. Synthetic rubber adhesives such as coalescence (SBS), ethylene-vinyl acetate copolymer (EVA) adhesives, and mixed adhesives thereof can be used. Among these, a cross-linked acrylic adhesive is preferably used because it is easy to obtain a highly transparent adhesive such that the total light transmittance of the adhesive sheet is 80% or more.
この架橋型アクリル系接着剤は、アクリル酸ブチル、アクリル酸エチル、２−エチルへキシルアクリレート等の低Ｔｇモノマーを主モノマーとし、アクリル酸、メタクリル酸、ヒドロキシエチルメタクリレート、ヒドロキシエチルアクリレート、アクリルアミド、アクリロ二トリル等の官能基モノマーと共重合することで得られたアクリル共重合体を架橋剤にて架橋することにより得ることができる。 This crosslinkable acrylic adhesive is mainly composed of a low Tg monomer such as butyl acrylate, ethyl acrylate, 2-ethylhexyl acrylate, and has acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxyethyl acrylate, acrylamide, acrylo The acrylic copolymer obtained by copolymerizing with a functional group monomer such as nitrile can be obtained by crosslinking with a crosslinking agent.
このアクリル共重合体としては、重量平均分子量が１０万〜１５０万の範囲内のものが好ましく用いられる。重量平均分子量が１０万より小さいと、接着剤中の低分子量物が多くなるため、接着剤の凝集力が低くなり易く、光学部材を接着した時に剥れ等の不具合が発生し易くなる。また、重量平均分子量が１５０万を超えると、溶剤に溶かした際に粘度が高くなり、接着シートにした時に平滑は接着剤塗工外観が得難い問題がある。また、このアクリル共重合体のガラス転移点（Ｔｇ）は、−２０℃以下のものが好ましく使用できる。−２０℃よりＴｇが高いと接着剤が硬くなり、室温にて圧着しても光学部材に対して適度な接着力が得られなくなる。 As this acrylic copolymer, those having a weight average molecular weight in the range of 100,000 to 1,500,000 are preferably used. If the weight average molecular weight is less than 100,000, the amount of low molecular weight substances in the adhesive increases, so the cohesive force of the adhesive tends to be low, and problems such as peeling are likely to occur when the optical member is bonded. Further, when the weight average molecular weight exceeds 1,500,000, the viscosity becomes high when dissolved in a solvent, and when it is made into an adhesive sheet, there is a problem that it is difficult to obtain a smooth adhesive coating appearance. The glass transition point (Tg) of this acrylic copolymer is preferably -20 ° C or lower. If the Tg is higher than −20 ° C., the adhesive becomes hard, and an appropriate adhesive force to the optical member cannot be obtained even if it is pressure-bonded at room temperature.
この架橋剤としては、イソシアネート系、メラミン系、エポキシ系等の公知の架橋剤を用いることができる。また、この架橋剤としては、接着剤中に緩やかに広がった網目状構造を形成するために、３官能、４官能といった多官能架橋剤がより好ましく用いられる。 As this crosslinking agent, known crosslinking agents such as isocyanate, melamine, and epoxy can be used. In addition, as this crosslinking agent, a polyfunctional crosslinking agent such as trifunctional or tetrafunctional is more preferably used in order to form a network structure that gently spreads in the adhesive.
また、この接着剤層には必要に応じて、粘着付与剤、酸化防止剤、紫外線吸収剤、軟化剤、充填剤等を適量添加してもよい。 In addition, an appropriate amount of a tackifier, an antioxidant, an ultraviolet absorber, a softener, a filler and the like may be added to the adhesive layer as necessary.
本発明における接着剤層の厚みは、通常５〜１００μｍが好ましい。更に好ましくは、１０〜５０μｍである。５μｍより薄いと光学部材表面の凹凸に追従することができず充分な接着力が得られなくなってしまう。また、１００μｍより厚いと単位面積辺りの価格が上がる、厚みにより透明性が低下する等の問題が発生する。 As for the thickness of the adhesive bond layer in this invention, 5-100 micrometers is preferable normally. More preferably, it is 10-50 micrometers. If the thickness is less than 5 μm, the unevenness on the surface of the optical member cannot be followed, and sufficient adhesive force cannot be obtained. On the other hand, when the thickness is greater than 100 μm, problems such as an increase in the price per unit area and a decrease in transparency due to the thickness occur.
本発明のセパレータ付き感圧型接着シートは、幅両端面上に１ｍｍ〜５０ｍｍの接着剤層の無い部分を設けていることが好ましい。接着剤層がプラスチックセパレータ端部まで全面に設けてあると、巻物状から巻き出した際に、剥がしたプラスチックセパレータ端面に接着剤層が付着し、もう一方のプラスチックセパレータ面上に平滑で外観の良い状態の接着剤が残留しない現象（泣き別れ現象）が発生する。この泣き別れ現象が発生すると、接着剤層を光学部材に平滑に貼り付けることができず、光学部材を外観よく貼り合わせることができない。また、幅両端面上に接着剤層の無い部分が５０ｍｍより大きい幅で設けられた場合、巻物状にした際に、接着剤層がある部分と無い部分でのひずみが大きくなり、端部からセパレータが剥離する現象（トンネリング現象）が発生し易くなる。このトンネリング現象が発生すると、接着剤層にプラスチックセパレータが剥離した凹凸形状が転写し、光学部材に貼り合わせた際に、その形状が残留し外観欠陥になる。５０ｍｍ以下であれば、巻物状とした場合の接着剤層がある部分と無い部分とでのひずみは小さく、端部からプラスチックセパレータが剥離する現象（トンネリング現象）が発生し難くなる。 In the pressure-sensitive adhesive sheet with a separator of the present invention, it is preferable to provide a portion having no adhesive layer of 1 mm to 50 mm on both width end faces. When the adhesive layer is provided on the entire surface up to the end of the plastic separator, the adhesive layer adheres to the peeled end of the plastic separator when unrolled from the roll, and the other plastic separator has a smooth appearance. A phenomenon that the adhesive in good condition does not remain (crying separation phenomenon) occurs. When this tear-off phenomenon occurs, the adhesive layer cannot be applied smoothly to the optical member, and the optical member cannot be attached with good appearance. In addition, when the part without the adhesive layer is provided with a width larger than 50 mm on the both end faces of the width, when forming a scroll, the distortion in the part with and without the adhesive layer increases, The phenomenon that the separator peels (tunneling phenomenon) easily occurs. When this tunneling phenomenon occurs, the concavo-convex shape from which the plastic separator is peeled off is transferred to the adhesive layer, and when it is bonded to the optical member, the shape remains and becomes an appearance defect. If it is 50 mm or less, the distortion between the part with and without the adhesive layer when it is in the form of a scroll is small, and the phenomenon that the plastic separator peels from the end part (tunneling phenomenon) becomes difficult to occur.
ここでの接着剤層の形成方法としては、有機溶剤に溶解し粘度を調整した接着剤を塗布する方法、接着剤を溶解し塗布する方法や水に分散し塗布する方法等の公知の方法を用いることができるが、架橋型アクリル系接着剤の形成方法としては、有機溶剤に溶解し粘度を調整した接着剤を塗布する方法が一般的であり、その接着剤の乾燥方法としては、生産性や２次加工性の面からフィルム上に接着剤層を塗布し搬送方式にて乾燥し巻物状にする方法が一般的である。 As a method for forming the adhesive layer here, a known method such as a method of applying an adhesive whose viscosity is adjusted by dissolving in an organic solvent, a method of dissolving and applying the adhesive, or a method of dispersing and applying in water is used. Although it can be used, a method of forming a cross-linked acrylic adhesive is generally a method of applying an adhesive having a viscosity adjusted by dissolving in an organic solvent, and a method of drying the adhesive is productivity. In general, from the viewpoint of secondary workability, a method of applying an adhesive layer on a film and drying it by a conveying method to form a scroll is common.
主モノマーとしてブチルアクリレートを用い、官能基モノマーとしてアクリル酸とメタクリル酸を用いたアクリル共重合体を溶液重合法にて合成した。この合成したアクリル共重合体の重量平均分子量は４０万であった．
このアクリル共重合体１００重量部に対し、エポキシ系架橋剤を０．１重量部配合した接着剤溶液を調整し、厚さ２５μｍ、幅４００ｍｍの二軸延伸ポリエステルフィルムの両面に剥離力の異なる熱硬化型シリコーン樹脂系離型剤を塗布したセパレータのA面に、乾燥時の接着剤厚さが４０μｍになるよう塗工し、更に、巻物状とし、セパレータのB面に接着剤層が接触するようにした。この接着シートを室温で１週間放置して充分にエージングを行った後、試験に使用した。尚、この接着シートでの接着剤を塗工したセパレータ面における接着剤層からの剥離力は６８ｍＮ／２５ｍｍであり、背面における接着剤層からの剥離力は４４ｍＮ／２５ｍｍであった。また、セパレータの１００℃−３０分投入後の加熱収縮率は、MD方向が＋０．１％、TD方向が−０．１％であった。更に、セパレータの表面粗さを測定した結果は塗工面、背面共に０．０５μｍであった。
An acrylic copolymer using butyl acrylate as the main monomer and acrylic acid and methacrylic acid as the functional group monomers was synthesized by a solution polymerization method. The synthesized acrylic copolymer had a weight average molecular weight of 400,000.
An adhesive solution containing 0.1 part by weight of an epoxy-based crosslinking agent is prepared with respect to 100 parts by weight of this acrylic copolymer, and heat having different peeling forces on both surfaces of a biaxially stretched polyester film having a thickness of 25 μm and a width of 400 mm. Apply to the A side of the separator coated with a curable silicone resin mold release agent so that the adhesive thickness when dried is 40 μm, and then form a scroll, and the adhesive layer contacts the B side of the separator I did it. This adhesive sheet was allowed to stand at room temperature for 1 week and sufficiently aged, and then used for the test. The peeling force from the adhesive layer on the separator surface coated with the adhesive on this adhesive sheet was 68 mN / 25 mm, and the peeling force from the adhesive layer on the back surface was 44 mN / 25 mm. Further, the heat shrinkage rate after the separator was added at 100 ° C. for 30 minutes was + 0.1% in the MD direction and −0.1% in the TD direction. Furthermore, the result of measuring the surface roughness of the separator was 0.05 μm on both the coated surface and the back surface.
接着剤を塗布したセパレータに、厚さ２５μｍの無延伸ポリイミドフィルムを使用した以外は実施例１と同様にして接着シートを作製した。この接着シートでの接着剤を塗工したセパレータ面における接着剤層からの剥離力は６４ｍＮ／２５ｍｍであり、背面における接着剤層からの剥離力は４０ｍＮ／２５ｍｍであった。また、セパレータの１００℃−３０分投入後の加熱収縮率は、MD、TD方向共にが０．０％であった。尚、セパレータの表面粗さを測定した結果は塗工面、背面共に０．０３μｍであった。 An adhesive sheet was prepared in the same manner as in Example 1 except that an unstretched polyimide film having a thickness of 25 μm was used for the separator coated with the adhesive. The peeling force from the adhesive layer on the separator surface coated with the adhesive on this adhesive sheet was 64 mN / 25 mm, and the peeling force from the adhesive layer on the back surface was 40 mN / 25 mm. In addition, the thermal shrinkage after the separator was added at 100 ° C. for 30 minutes was 0.0% in both the MD and TD directions. The result of measuring the surface roughness of the separator was 0.03 μm on both the coated surface and the back surface.
比較例１
接着剤を塗布したセパレータに、厚さ４０μｍの無延伸ポリプロピレンフィルムを使用した以外は実施例１と同様にして接着シートを作製した。この接着シートでの接着剤を塗工したセパレータ面における接着剤層からの剥離力は８３ｍＮ／２５ｍｍであり、背面における接着剤層からの剥離力は５５ｍＮ／２５ｍｍであった。また、セパレータの１００℃−３０分投入後の加熱収縮率は、MD方向が−０．１％、TD方向が＋０．２％であった。尚、セパレータの表面粗さを測定した結果は塗工面、背面共に０．３０μｍであった。
Comparative Example 1
An adhesive sheet was prepared in the same manner as in Example 1 except that an unstretched polypropylene film having a thickness of 40 μm was used for the separator coated with the adhesive. The peel force from the adhesive layer on the separator surface coated with the adhesive on this adhesive sheet was 83 mN / 25 mm, and the peel force from the adhesive layer on the back surface was 55 mN / 25 mm. Further, the heat shrinkage rate after the separator was added at 100 ° C. for 30 minutes was −0.1% in the MD direction and + 0.2% in the TD direction. The result of measuring the surface roughness of the separator was 0.30 μm on both the coated surface and the back surface.
比較例２
接着剤を塗布するセパレータの厚みを１２μｍとした以外は実施例１と同様にして接着シートを作製した．この接着シートでの接着剤を塗工したセパレータ面における接着剤層からの剥離力は６５ｍＮ／２５ｍｍであり、背面における接着剤層からの剥離力は４４ｍＮ／２５ｍｍであった。また、セパレータの１００℃−３０分投入後の加熱収縮率は、MD方向が＋０．５％、TD方向が−０．３％であった。尚、セパレータの表面粗さを測定した結果は塗工面、背面共に０．０５μｍであった。
Comparative Example 2
An adhesive sheet was prepared in the same manner as in Example 1 except that the thickness of the separator to which the adhesive was applied was 12 μm. The peeling force from the adhesive layer on the separator surface coated with the adhesive on this adhesive sheet was 65 mN / 25 mm, and the peeling force from the adhesive layer on the back surface was 44 mN / 25 mm. Further, the heat shrinkage rate after the separator was added at 100 ° C. for 30 minutes was + 0.5% in the MD direction and −0.3% in the TD direction. The result of measuring the surface roughness of the separator was 0.05 μm on both the coated surface and the back surface.
比較例３
接着剤を塗布するセパレータを、厚さ４０μｍの無延伸ポリエチレン（ＣＰE）とした以外は実施例１と同様にして接着シートを作製した。この接着シートでの接着剤を塗工したセパレータ面における接着剤層からの剥離力は８０ｍＮ／２５ｍｍであり、背面における接着剤層からの剥離力は６０ｍＮ／であった。また、接着剤を塗工したセパレータの１００℃−３０分投入後の加熱収縮率は、MD方向が−２．３％、TD方向が−２．０％であった。尚、セパレータの表面粗さを測定した結果は塗工面、背面共に０．０９μｍであった。
Comparative Example 3
An adhesive sheet was prepared in the same manner as in Example 1 except that the separator to which the adhesive was applied was unstretched polyethylene (CPE) having a thickness of 40 μm. The peel force from the adhesive layer on the separator surface coated with the adhesive on this adhesive sheet was 80 mN / 25 mm, and the peel force from the adhesive layer on the back surface was 60 mN /. In addition, the heat shrinkage rate of the separator coated with the adhesive after charging at 100 ° C. for 30 minutes was −2.3% in the MD direction and −2.0% in the TD direction. The result of measuring the surface roughness of the separator was 0.09 μm on both the coated surface and the back surface.
比較例４
接着剤を塗布するセパレータの両面の離型性を同じにした以外は実施例１と同様にして接着シートを作製した．この接着シートでの接着剤を塗工したセパレータ面における接着剤層からの剥離力は４６ｍＮ／２５ｍｍであり、背面における接着剤層からの剥離力は４５ｍＮ／２５ｍｍであった。また、接着剤を塗工したセパレータの１００℃−３０分投入後の加熱収縮率は、MD方向が−０．４％、TD方向が−０．３％であった。尚、セパレータの表面粗さを測定した結果は塗工面、背面共に０．０５μｍであった。
Comparative Example 4
An adhesive sheet was prepared in the same manner as in Example 1 except that the releasability on both sides of the separator to which the adhesive was applied was the same. The peel force from the adhesive layer on the separator surface coated with the adhesive on this adhesive sheet was 46 mN / 25 mm, and the peel force from the adhesive layer on the back surface was 45 mN / 25 mm. In addition, the heat shrinkage rate of the separator coated with the adhesive after 100 ° C. for 30 minutes was −0.4% in the MD direction and −0.3% in the TD direction. The result of measuring the surface roughness of the separator was 0.05 μm on both the coated surface and the back surface.
比較例５
接着剤を塗布するセパレータ面の熱硬化型シリコーン樹脂系離型剤の塗布量を低減させたセパレータを使用した以外は実施例１と同様にして接着シートを作製した。この接着シートでの接着剤を塗工したセパレータ面における接着剤層からの剥離力は４１０ｍＮ／２５ｍｍであり、背面における接着剤層からの剥離力は４２ｍＮ／２５ｍｍであった。また、接着剤を塗工したセパレータの１００℃−３０分投入後の加熱収縮率は、MD方向が−０．２％、TD方向が−０．１％であった。尚、セパレータの表面粗さを測定した結果は塗工面、背面共に０．０５μｍであった。
Comparative Example 5
An adhesive sheet was produced in the same manner as in Example 1 except that a separator in which the coating amount of the thermosetting silicone resin release agent on the separator surface to which the adhesive was applied was reduced was used. The peeling force from the adhesive layer on the separator surface coated with the adhesive on this adhesive sheet was 410 mN / 25 mm, and the peeling force from the adhesive layer on the back surface was 42 mN / 25 mm. In addition, the heat shrinkage rate of the separator coated with the adhesive after charging at 100 ° C. for 30 minutes was −0.2% in the MD direction and −0.1% in the TD direction. The result of measuring the surface roughness of the separator was 0.05 μm on both the coated surface and the back surface.
上記の各実施例及び比較例の接着シートの特性を下記の方法で試験した。また、それぞれの試験結果は表１にまとめた。
（１）全光線透過率
全光線透過率は、２枚のプラスチックセパレータを剥がし接着剤層のみの状態で、積分球式濁度計（日本電飾工業株式会社製、ＮＤＨ２０００型）を用いてＪＩＳ‐Ｋ７１０５に順じて測定した。
（２）対アクリル板接着力
一方のプラスチックセパレータを剥がした接着シートをアクリル板（住友化学工業製スミペックＥ０００、厚み１．５ｍｍフラット板）に圧力５８８０Ｎ／ｍをかけたゴムロールを用い２ｍ／分の速度で貼り付け、更にもう一方のプラスチックセパレータを剥がし同様の条件にて２５μｍＰＥＴフィルム（ユニチカ製Ｓ−２５）を貼り付けて試験片を作製し、更に３０分間室温に放置し、その後、剥離角度１８０度、剥離速度０．３ｍ／分、室温にて接着力（Ｎ／２５ｍｍ）を測定した。
（３）セパレータの剥離力
接着剤層からプラスチックセパレータを、剥離角度１８０度、剥離速度１ｍ／分、室温雰囲気下で剥がす時の剥離力（ｍＮ／２５ｍｍ）を測定した。
（４）加熱収縮率
セパレータを１２０ｍｍ角に切りだし、ＭＤ、ＴＤ各方向における１００ｍｍ長さの各直線中心が交差する点が１２０ｍｍ角の中央になるようにし、その直線のＭＤ方向の線の両端、ＴＤ方向の線の両端にそれぞれ印を付け、そのＭＤ、ＴＤ各方向の点間距離を測定距離とする。１００℃中に３０分間投入後、点間距離を測定した。
（５）セパレータの表面粗さ
接着剤層面に接したセパレータの表面粗さを接触型表面粗さ計（株式会社小坂研究所製、測定装置ＳＥ−３Ｃ、解析装置ＡＹ−２２）にて測定し、中心線平均粗さ（Ｒａ）の値を使用した。
（６）貼り合わせ作業性
一方のセパレータを剥がした接着シートを大きさ２００ｍｍ×３００ｍｍのアクリル板（住友化学工業製スミペックＥ０００、厚み１．５ｍｍフラット板）に圧力５８８０Ｎ／ｍをかけたゴムロールを用い２ｍ／分の速度で貼り付けた。更にもう一方のプラスチックセパレータを剥がし、５０μｍPETフィルム（ユニチカ製S−５０）を同様の条件にてラミネートした。このときの貼り合わせ作業性及び貼り合わせ作業性を評価した試験片の外観を確認し、評価した。
（ａ）貼り合わせ作業性の評価基準
○：巻物状から容易に巻き出すことができ、貼り合わせ作業が容易にできた。
×：巻物状から巻き出す際に泣き別れ現象が発生し、貼り合わせ作業性が悪かった。
（ｂ）貼り合わせ外観の評価基準
○：気泡の混入や接着剤層の変形跡等が確認できず外観が良好であった。
×：気泡の混入や接着剤層の変形跡等が確認でき外観欠陥が発生している。
The characteristics of the adhesive sheets of the above Examples and Comparative Examples were tested by the following method. The test results are summarized in Table 1.
(1) Total light transmittance The total light transmittance is JIS using an integrating sphere turbidimeter (NDH2000 model, manufactured by Nippon Denka Kogyo Co., Ltd.) with only two adhesive separators peeled off. -Measured according to K7105.
(2) Adhesive force to acrylic plate 2 m / min using an adhesive sheet from which one plastic separator has been peeled off using a rubber roll in which a pressure of 5880 N / m is applied to an acrylic plate (Sumipec E000 manufactured by Sumitomo Chemical Co., Ltd., thickness 1.5 mm flat plate). At a speed, the other plastic separator is peeled off, and a 25 μm PET film (S-25 manufactured by Unitika) is attached under the same conditions to produce a test piece. The adhesion strength (N / 25 mm) was measured at room temperature and a peeling speed of 0.3 m / min.
(3) Separation Force of Separator The peeling force (mN / 25 mm) when the plastic separator was peeled from the adhesive layer at a peeling angle of 180 degrees, a peeling speed of 1 m / min, at room temperature was measured.
(4) Heat shrinkage rate The separator is cut into 120 mm squares, and the point where each straight line center of 100 mm length in each direction of MD and TD intersects becomes the center of 120 mm square, and both ends of the straight line in the MD direction. , Mark both ends of the line in the TD direction, and let the distance between points in the MD and TD directions be the measurement distance. After throwing into 100 ° C. for 30 minutes, the distance between points was measured.
(5) Surface roughness of the separator The surface roughness of the separator in contact with the adhesive layer surface was measured with a contact-type surface roughness meter (manufactured by Kosaka Laboratory Ltd., measuring device SE-3C, analyzing device AY-22). The centerline average roughness (Ra) value was used.
(6) Bonding workability A rubber roll in which a pressure of 5880 N / m is applied to an acrylic sheet (Sumitomo Chemical Industries Sumipec E000, thickness 1.5 mm flat plate) having a size of 200 mm x 300 mm is peeled off from one adhesive sheet. Affixed at a speed of 2 m / min. Further, the other plastic separator was peeled off, and a 50 μm PET film (S-50 manufactured by Unitika) was laminated under the same conditions. The external appearance of the test piece which evaluated the bonding workability | operativity and bonding workability | operativity at this time was confirmed and evaluated.
(A) Evaluation Criteria for Bonding Workability ○: It was possible to easily unwind from the roll shape, and the bonding operation was easy.
X: The phenomenon of crying off occurred when unwinding from the scroll shape, and the laminating workability was poor.
(B) Evaluation Criteria for Bonding Appearance B: No appearance of bubbles or deformation marks on the adhesive layer could be confirmed, and the appearance was good.
X: Mixing of bubbles and deformation traces of the adhesive layer can be confirmed, resulting in appearance defects.
表１から明らかなように、本発明の接着シートである実施例１〜２は、貼り合わせ作業性に優れ、また、貼り合わせた試験片の外観も良好であった。
プラスチックセパレータにおいて、表面粗さＲａがＡ面、Ｂ面共に０．３０μｍであった比較例１は、接着剤層に粗さが転写し、貼り合わせた試験片に気泡の混入が観察された。
As is clear from Table 1, Examples 1 and 2 which are adhesive sheets of the present invention were excellent in bonding workability, and the appearance of the bonded test pieces was also good.
In Comparative Example 1 where the surface roughness Ra of the plastic separator was 0.30 μm on both the A and B surfaces, the roughness was transferred to the adhesive layer, and air bubbles were observed in the bonded test pieces.
接着剤を塗布したセパレータにおいて、１００℃−３０分投入後のMD、TD各方向の加熱収縮率が±１．０％の範囲外であった比較例３は、セパレータの収縮量が大きい為にアクリル板への貼り合わせ時にシワが発生した。さらに、MD、TD各方向の加熱収縮率が±１．０％以内でも、ＭＤ方向とＴＤ方向の加熱収縮率の差が０．５％を超えた比較例２では、シワの発生は抑制されていたが、ＭＤ方向とＴＤ方向への加熱収縮率差によりセパレータに歪みが発生し、その歪みがアクリル板への貼り合わせ後にも確認できた。これら比較例２、３の接着シートは、貼り合わせたアクリル板においてシワの凹凸形状や歪みが残留し、光透過時の均一性が失われ、外観欠陥として観察された。 In the separator to which the adhesive was applied, Comparative Example 3 in which the heat shrinkage in each direction of MD and TD after feeding at 100 ° C. for 30 minutes was outside the range of ± 1.0% was due to the large shrinkage of the separator. Wrinkles were generated when bonding to the acrylic plate. Furthermore, even if the heat shrinkage in each direction of MD and TD is within ± 1.0%, in Comparative Example 2 in which the difference between the heat shrinkage in the MD direction and the TD direction exceeds 0.5%, the generation of wrinkles is suppressed. However, distortion was generated in the separator due to the difference in the heat shrinkage rate between the MD direction and the TD direction, and the distortion could be confirmed even after bonding to the acrylic plate. In the adhesive sheets of Comparative Examples 2 and 3, wrinkled irregularities and distortions remained in the bonded acrylic plates, and the uniformity during light transmission was lost, which was observed as an appearance defect.
セパレータの両面における接着剤層からの剥離力の差が小さい比較例４では、巻物状から巻き出した際に泣き別れ現象が発生し、貼り合わせ作業性が悪かった。また、接着剤を塗布したセパレータ面において接着剤層からの剥離力が大きい比較例５では、巻物状から巻き出す際には問題なく剥離できたが、アクリル板貼り付け後、塗工側のセパレータを剥離する際に、接着剤層の変形が発生した。これら比較例４、５の接着シートは、貼り合わせる場合に泣き別れ現象等の接着剤層の変形によりセパレータから接着剤層が変形なく平滑に剥離できない為、貼り合わせたアクリル板では気泡の混入や接着剤層のシワ跡等の外観欠陥が観察された。
In Comparative Example 4 in which the difference in peeling force from the adhesive layer on both sides of the separator was small, a tearing phenomenon occurred when unwinding from the scroll shape, and the bonding workability was poor. Further, in Comparative Example 5 in which the peeling force from the adhesive layer was large on the separator surface to which the adhesive was applied, it could be peeled off without any problem when unwinding from the roll shape, but after application of the acrylic plate, the separator on the coating side When peeling off, deformation of the adhesive layer occurred. In the adhesive sheets of Comparative Examples 4 and 5, the adhesive layer cannot be peeled smoothly and without deformation from the separator due to deformation of the adhesive layer such as a tearing phenomenon when bonded together. Appearance defects such as wrinkle marks on the agent layer were observed.
Claims (7)
A method for assembling an optical member assembly in which an optical member is bonded to the pressure-sensitive adhesive sheet with a separator according to any one of claims 1 to 6, wherein the peeling is performed between the A side and the B side of the plastic separator. A method for producing an optical member assembly, comprising assembling a pressure-sensitive adhesive layer from which a weak surface is peeled off and a second optical member.
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| JP2004338798A JP2006143961A (en) | 2004-11-24 | 2004-11-24 | Pressure-sensitive adhesive sheet with separator, optical component assembly and method for producing the same |
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| CN107177320A (en) * | 2016-03-10 | 2017-09-19 | 德莎欧洲公司 | Composite system with weak adhesion gasket material |
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