【０００１】 [0001]

【産業上の利用分野】本発明は打抜き加工して用いる両面接着テープもしくは両面接着シート（以下、これらを両面接着テープと称す）に関する。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-sided adhesive tape or double-sided adhesive sheet (hereinafter referred to as double-sided adhesive tape) which is used after punching.

【０００２】 [0002]

【従来の技術】フィルム状基材の両面に感圧性接着剤層（粘着剤層）を設けた接着材をセパレータ上に仮着した両面接着テープは２つの物品を接着させる用途に使用されている。2. Description of the Related Art A double-sided adhesive tape having a pressure-sensitive adhesive layer (adhesive layer) provided on both sides of a film-like substrate and temporarily attached on a separator is used for bonding two articles. ..

【０００３】そして、近年、図１に示すようにリング状構造を有するフィルム基材の両面に、感圧性接着剤層を設けて成る接着材１を所定間隔毎にセパレータ２上に仮着した両面接着テープも提案されている。In recent years, as shown in FIG. 1, both surfaces of a film base material having a ring-shaped structure are temporarily adhered to a separator 2 with an adhesive material 1 provided with pressure-sensitive adhesive layers on both surfaces at predetermined intervals. Adhesive tapes have also been proposed.

【０００４】かようなリング状構造の接着材を有する両面接着テープは、例えば、実開昭６１−１２６４１６号公報、実公昭６１−２６３３９号公報に記載されているように、磁性層を有する磁気シートの中心部に設けた孔に金属製芯金を接着させて磁気フロッピィーディスクを製造するのに使用できる。A double-sided adhesive tape having such an adhesive material having a ring-shaped structure has a magnetic layer having a magnetic layer as disclosed in, for example, Japanese Utility Model Publication No. 61-126416 and Japanese Utility Model Publication No. 61-26339. It can be used to manufacture a magnetic floppy disk by adhering a metal cored bar to the hole provided at the center of the sheet.

【０００５】ところで、このリング状構造の接着材をセパレータ上に仮着した両面接着テープは、図２に示すようにフィルム状基材の両面に感圧性接着剤層を形成した接着材原反３をセパレータ２上に仮着した後、該接着材原反３を打抜き治具によりリング状に打抜き、その余剰部分３ａ、３ｂをセパレータから剥離除去することにより得ることができる。この接着材原反の感圧性接着剤としては、実開昭６１−１２６４１６号公報に記載されているようにスチレン−ブタジエン共重合体ゴム（以下、

【０００６】 [0006]

【発明が解決しようとする課題】ところが、上記ＳＢＲを主成分とする感圧性接着剤は流動性が大きく、接着材原反の打抜き加工時に作用する応力により流動する。そして、この流動によりリング形状の外縁或いは内縁からはみ出し、その結果、リング状接着材の外径および内径の寸法や接着材面積が設計値と異なってしまい、不良となってしまうという不都合がしばしば生じていた。However, the above-mentioned SBR
The pressure-sensitive adhesive containing as a main component has a large fluidity and flows due to the stress acting during the punching process of the raw material of the adhesive. Then, this flow causes protrusion from the outer edge or the inner edge of the ring shape, and as a result, the dimensions of the outer diameter and inner diameter of the ring-shaped adhesive material and the adhesive material area are different from the designed values, and this often causes the inconvenience of failure. Was there. The pressure-sensitive adhesive containing as a main component has a large fluidity and flows due to the stress acting during the punching process of the raw material of the adhesive. Then, this flow causes protrusion from the outer edge or the inner edge of the ring shape, and as a result, the dimensions of the outer diameter and inner diameter of the ring-shaped adhesive material and the adhesive material area are different from the designed values, and this often causes the inconvenience of failure. Was there.

【０００７】また、打抜き後における該接着剤の流動により、リング状部分と剥離除去すべき部分との境界部において再接着現象を生じ、余剰部分の剥離時にリング状部分もセパレータから剥離されてしまうこともある。Further, the flow of the adhesive after punching causes a re-adhesion phenomenon at the boundary between the ring-shaped portion and the portion to be peeled and removed, and the ring-shaped portion is also peeled off from the separator when the surplus portion is peeled off. Sometimes.

【０００８】従って、本発明は感圧性接着剤の流動が少なく、打抜き加工に好適な両面接着テープを提供することを目的とする。 Therefore, an object of the present invention is to provide a double-sided adhesive tape which is suitable for punching, because the pressure-sensitive adhesive does not flow easily.

【０００９】かような本発明に係る両面接着テープは、従来品と同様に磁気ディスクの製造に際し、磁気シートに設けられた孔に金属製芯金を挿入して接着させるのに用いることができる。 The double-sided adhesive tape according to the present invention is
Like the conventional product, it can be used for inserting and adhering a metal cored bar into a hole provided in a magnetic sheet when manufacturing a magnetic disk. Like the conventional product, it can be used for inserting and adhering a metal cored bar into a hole provided in a magnetic sheet when manufacturing a magnetic disk.

【００１０】 [0010]

【課題を解決するための手段】本発明者は従来技術の有する上記課題を解決するため、鋭意研究の結果、特定のポリマーを主成分とする接着剤を使用することにより、所期の目的が達成できることを見い出し、本発明を完成するに至った。 In order to solve the above problems of the prior art, the present inventor has conducted extensive studies and found that the use of an adhesive containing a specific polymer as a main component
The inventors have found that the intended purpose can be achieved, and completed the present invention. The respectively have found that the intended purpose can be achieved, and completed the present invention.

【００１１】即ち、本発明に係る打抜き加工用両面接着テープはセパレータ上に、スチレン−ブタジエン−スチレンブロック共重合体（以下、ＳＢＳと称す）を主成分とし且つ弾性率が４０〜１２０ｇ／ｍｍ である感圧性接着剤層が仮着されて成ることを特徴とするものである。 That is, the double-sided adhesive tape for punching according to the present invention has a styrene-butadiene-styrene block copolymer (hereinafter referred to as SBS) as a main component on a separator and has an elastic modulus of 40 to 120 g / mm ^2. The pressure-sensitive adhesive layer is temporarily attached.

【００１２】本発明において感圧性接着剤の主成分として用いるＳＢＳとしては、スチレン含有量が約２０〜６

【００１３】感圧性接着剤を構成する成分および各成分の配合量を決定するには、この感圧性接着剤の弾性率が４０〜１２０ｇ／ｍｍとなるように留意する。弾性率がこれよりも小さいと流動性が大きくなり、弾性率が大きいと初期接着力が不足するようになるので、いずれも好ましくない。In order to determine the components constituting the pressure-sensitive adhesive and the blending amount of each component, care should be taken so that the elastic modulus of the pressure-sensitive adhesive is 40 to 120 g / mm ² . When the elastic modulus is smaller than this range, the fluidity becomes large, and when the elastic modulus is large, the initial adhesive force becomes insufficient, which is not preferable.

【００１４】本発明に係る打抜き加工用両面接着テープを得るには、例えば、ＳＢＳに所定の添加剤を適量配合して有機溶媒に溶解して感圧性接着剤溶液を得、これをセパレータ上に塗布して乾燥すればよい。セパレータとしては紙、布、プラスチックフィルムにシリコーン樹脂やフッ素樹脂のような剥離性樹脂を塗布乾燥したものや、フッ素樹脂シート、ポリエチレンシートのような非接着性シートを使用できる。To obtain the double-sided adhesive tape for punching according to the present invention, for example, SBS is mixed with an appropriate amount of a predetermined additive and dissolved in an organic solvent to obtain a pressure-sensitive adhesive solution, which is placed on a separator. It may be applied and dried. As the separator, paper, cloth, a plastic film coated with a peelable resin such as a silicone resin or a fluororesin and dried, or a non-adhesive sheet such as a fluororesin sheet or a polyethylene sheet can be used.

【００１５】また、本発明に係る打抜き用両面接着シートはＳＢＳを主成分とし且つ弾性率が４０〜１２０ｇ／ｍｍである感圧性接着剤層をフィルム状基材の両面に設けた接着材が、セパレータ上に仮着されたものであってもよい。フィルム状基材としては、柔軟性を要求されるときは織布、不織布等を、寸法精度を要求されるときはプラスチックフィルム、金属箔、紙等を使用できる。The double-sided adhesive sheet for punching according to the present invention contains SBS as a main component and has an elastic modulus of 40 to 120 g /
The pressure-sensitive adhesive layer having a size of mm provided on both sides of the film-shaped substrate may be temporarily adhered to the separator. As the film-like substrate, woven fabric, non-woven fabric or the like can be used when flexibility is required, and plastic film, metal foil, paper or the like can be used when dimensional accuracy is required. The pressure-sensitive adhesive layer having a size of mm ² provided on both sides of the film-shaped substrate may be temporarily adhered to the separator. As the film-like substrate, woven fabric, non-woven fabric or the like can be used when flexibility is required, and plastic film, metal foil, paper or the like can be used when dimensional accuracy is required.

【００１６】 [0016]

【実施例】以下、実施例により本発明を更に詳細に説明する。なお、実施例および比較例において、感圧性接着剤の構成成分の配合量を示す「部」はいずれも「重量部」である。The present invention will be described in more detail with reference to the following examples. In the examples and comparative examples, all "parts" indicating the blending amounts of the constituents of the pressure-sensitive adhesive are "parts by weight".

【００１７】実施例１ スチレン含有量４０モル％のＳＢＳ１００部に対し、ポリテルペン系樹脂（粘着付与剤）１００部、ナフテン系プロセスオイル（軟化剤）５部をトルエンに溶解して固形分濃度４０重量％の感圧性接着剤溶液を得る。Example 1 To 100 parts of SBS having a styrene content of 40 mol%, 100 parts of a polyterpene resin (tackifier) and 5 parts of naphthenic process oil (softening agent) were dissolved in toluene to obtain a solid content concentration of 40% by weight. % Pressure sensitive adhesive solution.

【００１８】この接着剤溶液を厚さ３８μｍのポリエチレンテレフタレート（以下、ＰＥＴと称す）フィルムの両面に塗布し、温度１２０℃で５分間乾燥することにより、該フィルムの両面に各々厚さ４５μｍの感圧性接着剤層（弾性率６０ｇ／ｍｍ）を有する両面接着材とし、これを紙にシリコーン樹脂を塗布乾燥して成るセパレータ上に仮着して、打抜き加工用両面接着テープを得た。This adhesive solution was applied to both sides of a polyethylene terephthalate (hereinafter referred to as PET) film having a thickness of 38 μm, and dried at a temperature of 120 ° C. for 5 minutes to give a film having a thickness of 45 μm on both sides of the film. A double-sided adhesive having a pressure-sensitive adhesive layer (elastic modulus of 60 g / mm ² ) was used, and this was temporarily attached to a separator formed by applying silicone resin to paper and drying, to obtain a double-sided adhesive tape for punching.

【００１９】なお、感圧性接着剤の弾性率は、上記感圧性接着剤溶液をセパレータ上に塗布し、温度１２０℃で５分間乾燥することにより、厚さ４５μｍの接着剤層を形成し、これを長さ３０ｍｍ、幅１０ｍｍに切断し、次いで、この接着剤サンプルを万能引張試験機（東洋測器社製、テンシロンＵＴＭ−ＩＩＩ−１００）を用い、温度２３±３℃、湿度６５±２０％、チャック間隔１０ｍ

【００２０】この両面接着テープにおける感圧性接着剤のステンレス板に対する接着力（ＪＩＳ Ｚ １５２８に規定される方法により測定）は、１２３０ｇ／２０ｍ ｍ幅であった。 The adhesive strength of the pressure-sensitive adhesive to the stainless steel plate in this double-sided adhesive tape (JIS Z 1528
(Measured by the method specified in 1) is 1230 g / 20 m
It was m width.

【００２１】また、両面接着テープにおける感圧性接着剤の流動性示すズレ距離−剪断応力曲線を図３に示した。この曲線は両面テープをテープを縦、横の寸法が各々２０ｍｍになるように切断し、図４に示すように該テープ片４を介してステンレス板５とＰＥＴフィルム（厚さ１８８μｍ）６を接着せしめ、万能引張試験機にセットし、温度２５℃、引張速度０．５ｍｍ／ｍｉｎの条件で矢印方向に引張り、テープ片４のズレ距離と該テープ片に作用する剪断応力を測定し、ズレ距離および剪断応力をグラフ上にプロットして作製した。FIG. 3 shows the deviation distance-shear stress curve showing the fluidity of the pressure-sensitive adhesive in the double-sided adhesive tape. This curve is obtained by cutting the double-sided tape so that the vertical and horizontal dimensions are each 20 mm, and bonding the stainless steel plate 5 and the PET film (thickness 188 μm) 6 through the tape piece 4 as shown in FIG. Set in a universal tensile tester, pull in the direction of the arrow at a temperature of 25 ° C. and a pulling speed of 0.5 mm / min, measure the deviation distance of the tape piece 4 and the shear stress acting on the tape piece, and measure the deviation distance. And the shear stress were plotted on the graph.

【００２２】実施例２ ポリテルペン樹脂に代え脂肪族系環状炭化水素樹脂を用いること以外は実施例１と同様に作業して、弾性率１０ ０ｇ／ｍｍ の感圧性接着剤層を有する打抜き加工用両面接着テープを得た。 Example 2 The same operation as in Example 1 was conducted except that an aliphatic cyclic hydrocarbon resin was used instead of the polyterpene resin, and an elastic modulus of 10 was obtained.
A double-sided adhesive tape for punching having a pressure-sensitive adhesive layer of 0 g / mm ² was obtained.

【００２３】比較例１ ＳＢＲ１００部に対して、ポリテルペン系樹脂３０部、
水添ロジンエステル系樹脂６０部およびナフテン系プロセスオイル５部をトルエンに溶解して固形分４０重量％ 60 parts of hydrogenated rosin ester resin and 5 parts of naphthenic process oil are dissolved in toluene to have a solid content of 40% by weight.
の感圧性接着剤溶液を得る。 To obtain a pressure sensitive adhesive solution. この接着剤溶液を用いること以外は実施例１と同様に作業して、両面接着テープを得た。 A double-sided adhesive tape was obtained in the same manner as in Example 1 except that this adhesive solution was used. Comparative Example 1 100 parts of SBR, 30 parts of polyterpene resin, Comparative Example 1 100 parts of SBR, 30 parts of polyterpene resin,
60 parts of hydrogenated rosin ester resin and 5 parts of naphthenic process oil are dissolved in toluene to give a solid content of 40% by weight. 60 parts of hydrogenated rosin ester resin and 5 parts of naphthenic process oil are dissolved in toluene to give a solid content of 40% by weight.
To obtain a pressure-sensitive adhesive solution. A double-sided adhesive tape was obtained in the same manner as in Example 1 except that this adhesive solution was used. To obtain a pressure-sensitive adhesive solution. A double-sided adhesive tape was obtained in the same manner as in Example 1 except that this adhesive solution was used.

【００２４】 [0024]

【発明の効果】本発明は上記のように構成され、ＳＢＳ
を主成分とし且つ弾性率の特定された感圧性接着剤を用いたので、実施例に示されているように流動性が小さく、打抜き加工に好適である。 Since a pressure-sensitive adhesive having a specific elastic modulus as a main component was used, the fluidity is small as shown in Examples, and it is suitable for punching. The present invention is constructed as described above, and the SBS The present invention is constructed as described above, and the SBS
Since a pressure-sensitive adhesive containing as a main component and having a specified elastic modulus was used, it has a small fluidity as shown in the examples and is suitable for punching. Since a pressure-sensitive adhesive containing as a main component and having a specified elastic modulus was used, it has a small fluidity as shown in the examples and is suitable for punching.

【図１】打抜き加工した両面接着テープの実例を示す平面図である。 FIG. 1 is a plan view showing an example of a punched double-sided adhesive tape.

【図２】打抜き加工用両面接着テープの実例を示す斜視図である。 FIG. 2 is a perspective view showing an example of a double-sided adhesive tape for punching.

【図３】両面接着テープの性能を示すグラフである。 FIG. 3 is a graph showing the performance of the double-sided adhesive tape.

【図４】両面接着テープの性能試験の方法を示す側面図である。 FIG. 4 is a side view showing a method of a performance test of a double-sided adhesive tape.

１ 接着材 ２ セパレータ1 Adhesive 2 Separator

───────────────────────────────────────────────────── フロントページの続き (72)発明者 諸石 裕 大阪府茨木市下穂積１丁目１番２号 日東 電工株式会社内─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroshi Moroishi 1-2-1, Shimohozumi, Ibaraki City, Osaka Prefecture Nitto Denko Corporation