JPH0229705B2 - - Google Patents
Info
- Publication number
- JPH0229705B2 JPH0229705B2 JP58184300A JP18430083A JPH0229705B2 JP H0229705 B2 JPH0229705 B2 JP H0229705B2 JP 58184300 A JP58184300 A JP 58184300A JP 18430083 A JP18430083 A JP 18430083A JP H0229705 B2 JPH0229705 B2 JP H0229705B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- sensitive adhesive
- tape
- adhesive tape
- support
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Adhesive Tapes (AREA)
Description
本発明は感圧接着テープの製法に関するもので
あつて、さらに詳しくは液体吸着性基材をテープ
支持体とし且つ熱可塑性合成ゴムを主成分とする
感圧接着層内に無数の微小独立気泡を含有させた
感圧接着テープの製法を提供するものである。
従来、感圧接着テープは、一般にテープ支持体
にエマルジヨン系又は溶剤系感圧接着性物質を塗
布乾燥して作られるが、水や溶剤などを乾燥除去
するために多大のエネルギーを必要とすること、
及びかかる乾燥能力には限界があり高速生産でき
にくいこと、などの制約があり、さらに溶剤系に
おいては、溶剤の影響による公害及び影生上の問
題がある。
一方、熱可塑性合成ゴムを主成分とする感圧接
着性物質を用いると、溶融塗工が可能であり、加
熱溶融して直接テープ支持体に塗工できるので、
乾燥に要する程多大のエネルギーを必要とせず、
しかも高速生産が可能であるという利点を有する
ものである。
しかし、熱可塑性合成ゴムを主成分とする感圧
接着性物質は、主成分たる前記合成ゴムが分子構
造中に熱可塑性樹脂的部分即ち非ゴム的部分を含
むので、低温に曝されると硬くなり、初期接着力
が低く、被着体珠に段ボール紙などの粗面に対す
る接着性が劣るものである。その反面、常温或い
は高温下では、被着体面への接着力が高く、例え
ば貼り損じたときなどに剥がそうとすると、被着
体表面を損傷させたり、被着体を変形させるもの
である。
このような熱可塑性合成ゴムを含む感圧接着性
物質の欠点を解決するために、例えば特公昭44−
17037号公報では、接着性物質に軟化油を添加す
ることが提案されているが、主成分たる前記合成
ゴムの骨格を変化させることはできず、しかも反
対に高温下では接着性物質の凝集力の低下を招来
し、さらに糊面に油がプルームしてきて接着性を
低下させるものであつた。
本発明者はかかる熱可塑性合成ゴムを主成分と
する感圧接着性物質を用いてなる感圧接着テープ
の欠点を解決すべく、鋭意研究を重ねた結果、驚
くべきことに、感圧接着層中に特定の方法にて形
成した無数の微小独立気泡を含有させると、前記
の諸欠点が解決され、しかもすぐれた再剥離性が
得られることを知見し、本発明に致つたものであ
る。
即ち本発明は、テープ支持体と、該支持体面に
固着した感圧接着層とからなる感圧接着テープの
製法であつて、前記支持体は液体吸着性基材で且
つ該接着層は熱可塑性合成ゴムを主成分とすると
共に該層中に前記基材中に供給した揮散性物質を
浸透させこれをガス化によつて膨張させた無数の
微小独立気泡を含有させるものであることを特徴
とする感圧接着テープの製法を提供するものであ
る。
本発明の感圧接着テープの製法によれば、得ら
れたテープはすぐれた初期接着力を有し、低温下
でもすぐれた接着性を発揮すること、被着体の変
形に抗する保持特性が良好なこと、及び貼り付け
後に被着体面から剥離しても被着体面を損傷する
ことがない再剥離性を有すこと、などの特徴を有
する。
かかる特徴は、感圧接着層に揮散性物質を浸透
させこれをガス化によつて膨張させた無数の微小
独立気泡を含有させることにより、接着層の巨視
的構造が変化していることにより得られるもので
ある。
そして、揮散性物質の浸透ガス化によつて膨張
させた無数の微小独立気泡を有する感圧接着層
は、接着層の主成分が熱可塑性合成ゴムで構成さ
れていること、及びテープ支持体への塗工が熔融
塗工であることが、経日で独立気泡が喪失しない
という点から好ましいものであり、本発明者達の
実験によれば例えば天然ゴム溶剤系感圧接着層に
独立気泡質を含有させても、これを通常の感圧接
着テープの形態であるロール状に捲回すると、凝
集力が小さいこと及び残存溶剤などに起因して
か、経日で脱気したり、気泡が合一したりして、
気泡が喪失し、目的とする特性を発揮しないもの
であつた。
本発明の感圧接着テープの製法は、テープ支持
体として水又は有機溶剤の如き揮散性物質を含有
しうる液体吸着性基材例えば紙、織布、不織布、
多孔性フイルムなどを用いると、前記接着性物質
をテープ支持体面に塗工前に、テープ支持体に揮
散性物質を供給しておいて非塗工面をマスクし、
非マスク面に該物質を加熱塗工し、揮散性物質を
浸透させてガス化して膨張させるか、或いは前記
基材に接着性物質を塗設後基材に揮散性物質を供
給して加熱し、該物質を浸透させてガス化して膨
張させることにより接着層に無数の微小独立気泡
を形成させることができるものである。テープ支
持体に供給等によつて吸着される揮散性物質量は
支持体の厚みなどによつても異なるが、３重量％
以上（好ましくは30重量％以下）含有させること
が望ましいものである。
感圧接着層中の独立気泡は、接着層の厚み（約
15〜150μｍ）によつても異なるが、少なくとも
50％以上、好ましくは50〜90％が100μｍ以下の
泡径を有すると共に、１cm2当り4000個以上あるこ
とが望ましいものである。
本発明の実施に当つて用いられる熱可塑性合成
ゴムとしては、一般配置Ａ−Ｂ−Ａ型のエラスト
マーであり、Ａはスチレン、メチルスチレンなど
のビニル化合物で、そのガラス転移温度が70℃以
上のもので、約1000〜500000の範囲の平均重量分
子量を有するものであり、またＢはブタジエン、
イソプレンなどの共役ジエン化合物で、そのガラ
ス転移温度は−100〜30℃のもので、約4500〜
1000000の範囲の平均重量分子量を有するもであ
り、Ａが全体の約15〜65重量％であるブロツク共
重合体ゴムが好適である。
かかる熱可塑性合成ゴムを主成分とする感圧接
着性物質には、天然ゴムの如き他のゴム成分を30
重量％以下の範囲で添加することができると共
に、例えば接着性付与樹脂、老化防止剤、色剤な
どを適量添加することができる。
本発明の製法により得られる感圧接着テープが
すぐれた接着特性と再剥離性とを有することは、
以下の実施例から明らかである。
以下本発明の実施例を示す。文中部とあるのは
重量部を意味する。
実施例 １
スチレン−イソプレン−スチレンブロツク共重
合体ゴム（スチレン：ゴム＝14：86）100部、石
油系樹脂80部、及び老化防止剤１部からなる配合
物を加熱ニーダーで混練して感圧接着性物質を得
る。
該物質を熔融塗工機にて、クラフト紙の表面に
30μｍの厚みで塗工して、クラフト接着テープ(A)
を得る。
次にこのテープを40℃×90％R.H.中に24時間
保存してクラフト紙に約８重量％の湿分を含有さ
せ、次にこのテープを120℃で３分間加熱して、
感圧接着テープを得た。
得られたテープの接着層は平滑で、厚みは70μ
ｍで、接着層中には泡径が10〜60μｍの独立気泡
を約10000個／cm2以上有するものであつた。
第１表に実施例１及び２の特性結果を示す。第
１表中の比較例は実施例２における発泡処理前の
クラフト接着テープ(A)を示すものである。
The present invention relates to a method for manufacturing a pressure-sensitive adhesive tape, and more specifically, the present invention relates to a method for manufacturing a pressure-sensitive adhesive tape, and more specifically, the present invention relates to a method for manufacturing a pressure-sensitive adhesive tape. The present invention provides a method for manufacturing a pressure-sensitive adhesive tape containing the present invention. Conventionally, pressure-sensitive adhesive tapes are generally made by coating a tape support with an emulsion-based or solvent-based pressure-sensitive adhesive material and drying it, but it requires a large amount of energy to dry and remove water and solvent. ,
There are also limitations such as the limited drying ability and difficulty in high-speed production.Furthermore, in the case of a solvent-based method, there are problems with pollution and shadows due to the influence of the solvent. On the other hand, if a pressure-sensitive adhesive material whose main component is thermoplastic synthetic rubber is used, melt coating is possible, and it can be heated and melted and applied directly to the tape support.
Does not require as much energy as drying,
Moreover, it has the advantage that high-speed production is possible. However, pressure-sensitive adhesive materials whose main component is thermoplastic synthetic rubber become hard when exposed to low temperatures because the synthetic rubber, which is the main component, contains a thermoplastic resin-like part, that is, a non-rubber-like part, in its molecular structure. Therefore, the initial adhesion strength is low, and the adhesion of adherend beads to rough surfaces such as corrugated paper is poor. On the other hand, at room temperature or high temperature, the adhesion to the surface of the adherend is high, and if an attempt is made to peel it off, for example, when the adhesive fails, the surface of the adherend may be damaged or the adherend may be deformed. In order to solve the drawbacks of such pressure-sensitive adhesive materials containing thermoplastic synthetic rubber, for example,
Publication No. 17037 proposes adding a softening oil to the adhesive substance, but this does not change the skeleton of the synthetic rubber, which is the main component, and on the contrary, the cohesive force of the adhesive substance decreases at high temperatures. In addition, a plume of oil formed on the adhesive surface, reducing adhesive properties. The present inventor has conducted extensive research in order to solve the drawbacks of pressure-sensitive adhesive tapes made using pressure-sensitive adhesive substances mainly composed of thermoplastic synthetic rubber, and has surprisingly found that the pressure-sensitive adhesive layer The present invention was based on the finding that the above-mentioned drawbacks can be solved and excellent removability can be obtained by incorporating numerous fine closed cells formed by a specific method into the material. That is, the present invention is a method for producing a pressure-sensitive adhesive tape comprising a tape support and a pressure-sensitive adhesive layer fixed to the surface of the support, wherein the support is a liquid-adsorbing base material and the adhesive layer is a thermoplastic It is characterized by having synthetic rubber as its main component and containing countless minute closed cells made by permeating the volatile substance supplied into the base material and expanding it by gasification. The present invention provides a method for manufacturing a pressure-sensitive adhesive tape. According to the method for producing a pressure-sensitive adhesive tape of the present invention, the resulting tape has excellent initial adhesive strength, exhibits excellent adhesion even at low temperatures, and has retention properties that resist deformation of the adherend. It has characteristics such as good properties and removability that does not damage the adherend surface even if it is peeled off from the adherend surface after pasting. This feature is obtained by changing the macroscopic structure of the pressure-sensitive adhesive layer by infiltrating the pressure-sensitive adhesive layer with countless minute closed cells that are expanded by gasification. It is something that can be done. The pressure-sensitive adhesive layer, which has countless minute closed cells expanded by permeation and gasification of volatile substances, is composed of a thermoplastic synthetic rubber as the main component and is attached to the tape support. It is preferable that the coating be melt coating because the closed cells will not be lost over time, and according to the experiments of the present inventors, for example, if the natural rubber solvent-based pressure sensitive adhesive layer is coated with closed cells. Even if it contains a pressure-sensitive adhesive tape, if it is wound into a roll, which is the form of a normal pressure-sensitive adhesive tape, it may degas or bubble over time, probably due to the small cohesive force and residual solvent. By uniting,
The bubbles were lost and the desired properties were not exhibited. The method for producing the pressure-sensitive adhesive tape of the present invention involves using a liquid-adsorbing substrate such as paper, woven fabric, non-woven fabric, which may contain volatile substances such as water or an organic solvent as the tape support.
When using a porous film or the like, before coating the adhesive substance on the tape support surface, a volatile substance is supplied to the tape support and the non-coated surface is masked,
The substance is heated and applied to the non-mask surface, and the volatile substance is permeated, gasified and expanded, or the adhesive substance is applied to the base material, and then the volatile substance is supplied to the base material and heated. By permeating the substance, gasifying it, and expanding it, countless fine closed cells can be formed in the adhesive layer. The amount of volatile substances adsorbed to the tape support during supply etc. varies depending on the thickness of the support, etc., but is 3% by weight.
It is desirable to contain more than 30% by weight (preferably 30% by weight or less). The closed cells in the pressure-sensitive adhesive layer are approximately
15 to 150 μm), but at least
It is desirable that 50% or more, preferably 50 to 90%, have a bubble diameter of 100 μm or less, and that the number of bubbles is 4000 or more per cm 2 . The thermoplastic synthetic rubber used in the practice of the present invention is an elastomer with a general configuration A-B-A type, where A is a vinyl compound such as styrene or methylstyrene, and its glass transition temperature is 70°C or higher. and has an average weight molecular weight in the range of about 1,000 to 500,000, and B is butadiene,
A conjugated diene compound such as isoprene whose glass transition temperature is -100 to 30℃, approximately 4500 to 300℃.
Preferred are block copolymer rubbers having an average weight molecular weight in the range of 1,000,000, with A being about 15% to 65% by weight of the total. The pressure-sensitive adhesive material mainly composed of thermoplastic synthetic rubber may contain 30% of other rubber components such as natural rubber.
It can be added in a range of % by weight or less, and also suitable amounts of, for example, adhesion-imparting resins, anti-aging agents, coloring agents, etc. can be added. The pressure-sensitive adhesive tape obtained by the production method of the present invention has excellent adhesive properties and removability.
This is clear from the following examples. Examples of the present invention will be shown below. The text middle part means the weight part. Example 1 A mixture consisting of 100 parts of styrene-isoprene-styrene block copolymer rubber (styrene:rubber = 14:86), 80 parts of petroleum-based resin, and 1 part of anti-aging agent was kneaded in a heated kneader and then pressure-sensitive. Obtain adhesive substance. Apply the substance to the surface of kraft paper using a melt coating machine.
Coat with a thickness of 30μm and use craft adhesive tape (A)
get. Next, this tape was stored at 40°C x 90% RH for 24 hours to make the kraft paper contain about 8% moisture by weight, and then this tape was heated at 120°C for 3 minutes.
A pressure sensitive adhesive tape was obtained. The adhesive layer of the resulting tape is smooth and has a thickness of 70μ.
m, and the adhesive layer had approximately 10,000 closed cells/cm 2 or more with a bubble diameter of 10 to 60 μm. Table 1 shows the characteristic results of Examples 1 and 2. The comparative example in Table 1 shows the kraft adhesive tape (A) in Example 2 before foaming treatment.
【表】
第１表中の側定法（各れも20℃×60％R.H.中
で行つた）
接着力：JIS Ｚ 1522に準拠。
ボールタツク：米国Pressure Sensitive Tape
CouncilによるPSTC−６に準拠。
保持特性：図面の如く段ボール紙１の表面に幅25
mmのテープサンプル２を500ｇの荷重をかけて
図面の如く貼り付けて接着面積を25mm×25mmと
し、サンプル２に300ｇの荷重３をかけて、24
時間後の剥離長さを側定した。
再剥離性：段ボール紙に幅25mmのテープサンプル
を500ｇの荷重をかけて貼り付け、その後サン
プルを手でゆつくりと剥離して、段ボール紙の
表面状態を目視により判定する。
本発明の製法にて得られた感圧接着テープは、
上記実施例からも明らかな如く、良好な接着特性
と再剥離性とを有するものであり、殊に比較例に
比して接着力は劣るにもかかわらず、初期接着力
及び実用特性たる保持特性にすぐれているという
特徴を有するものである。[Table] Side method in Table 1 (all conducted at 20℃ x 60%RH) Adhesive strength: Compliant with JIS Z 1522. Ball tack: US Pressure Sensitive Tape
Compliant with PSTC-6 by Council. Retention characteristics: Width 25 on the surface of corrugated paper 1 as shown in the drawing
Apply a load of 500g to tape sample 2 of mm and paste it as shown in the drawing to make the adhesion area 25mm x 25mm. Apply a load of 300g to sample 2 and paste it as shown in the drawing.
The length of peeling after a period of time was determined. Re-peelability: A tape sample with a width of 25 mm is attached to a corrugated paperboard under a load of 500 g, and then the sample is gently peeled off by hand, and the surface condition of the corrugated paper is visually judged. The pressure-sensitive adhesive tape obtained by the manufacturing method of the present invention is
As is clear from the above examples, it has good adhesive properties and removability, and in particular, although the adhesive strength is inferior to that of the comparative example, it has good initial adhesive strength and retention properties, which are practical properties. It is characterized by excellent properties.
図面は本発明の製法にて得られた感圧接着テー
プの保持特性を評価する方法の概略説明図であ
る。
The drawings are schematic illustrations of a method for evaluating the retention properties of a pressure-sensitive adhesive tape obtained by the manufacturing method of the present invention.
Claims (1)
接着層とからなる感圧接着テープの製法であつ
て、前記支持体が液体吸着性基材で且つ該接着層
は熱可塑性合成ゴムを主成分とすると共に該層中
に前記基材中に供給した揮散性物質を浸透させこ
れをガス化によつて膨張させた無数の微小独立気
泡を含有させるものであることを特徴とする感圧
接着テープの製法。 ２ 熱可塑性合成ゴムがスチレン−イソプレン−
スチレンブロツク共重合体ゴムである特許請求の
範囲第１項記載の感圧接着テープの製法。[Scope of Claims] 1. A method for producing a pressure-sensitive adhesive tape comprising a tape support and a pressure-sensitive adhesive layer fixed to the surface of the support, wherein the support is a liquid-adsorbing base material and the adhesive layer is The main component is thermoplastic synthetic rubber, and the layer contains countless minute closed cells that are made by penetrating the volatile substance supplied into the base material and expanding it by gasification. Characteristic pressure-sensitive adhesive tape manufacturing method. 2 Thermoplastic synthetic rubber is styrene-isoprene-
A method for producing a pressure-sensitive adhesive tape according to claim 1, which is a styrene block copolymer rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18430083A JPS6076584A (en) | 1983-09-30 | 1983-09-30 | Pressure-sensitive adhesive tape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18430083A JPS6076584A (en) | 1983-09-30 | 1983-09-30 | Pressure-sensitive adhesive tape |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6076584A JPS6076584A (en) | 1985-05-01 |
| JPH0229705B2 true JPH0229705B2 (en) | 1990-07-02 |
Family
ID=16150916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18430083A Granted JPS6076584A (en) | 1983-09-30 | 1983-09-30 | Pressure-sensitive adhesive tape |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6076584A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12221568B2 (en) | 2019-01-22 | 2025-02-11 | Sekisui Chemical Co., Ltd. | Adhesive tape and method for producing same |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5322709A (en) * | 1992-04-28 | 1994-06-21 | Tesa Tuck, Inc. | Production of pressure sensitive hot melt-adhesive coated tape |
| US5539033A (en) * | 1992-11-06 | 1996-07-23 | Minnesota Mining And Manufacturing Company | Solventless compounding and coating of non-thermoplastic hydrocarbon elastomers |
| USRE36855E (en) * | 1992-11-06 | 2000-09-05 | 3M Innovative Properties Company | Solventless compounding and coating of non-thermoplastic hydrocarbon elastomers |
| US5605717A (en) * | 1995-06-01 | 1997-02-25 | Morgan Adhesives Company | Process for foaming an adhesive using moisture in a backing |
| JP5523688B2 (en) * | 2008-09-18 | 2014-06-18 | 株式会社イッコーズ | Foam pressure-sensitive adhesive sheet for adhesive dustproof tape used in clean room, method for producing the same, and adhesive dustproof tape used in clean room |
| JP2011157455A (en) * | 2010-01-29 | 2011-08-18 | Nichiban Co Ltd | Cloth adhesive tape and method for producing the same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52133380A (en) * | 1976-04-30 | 1977-11-08 | Nitto Electric Ind Co | Waterrproof fiber sheet containing foam structure and waterrproof composte fiber sheet |
| JPS5522392U (en) * | 1978-08-02 | 1980-02-13 | ||
| DE3274991D1 (en) * | 1982-01-15 | 1987-02-12 | Minnesota Mining & Mfg | Cellular pressure-sensitive adhesive product |
-
1983
- 1983-09-30 JP JP18430083A patent/JPS6076584A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12221568B2 (en) | 2019-01-22 | 2025-02-11 | Sekisui Chemical Co., Ltd. | Adhesive tape and method for producing same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6076584A (en) | 1985-05-01 |
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