JP3647546B2 - Double-sided adhesive tape - Google Patents
Double-sided adhesive tape Download PDFInfo
- Publication number
- JP3647546B2 JP3647546B2 JP08380696A JP8380696A JP3647546B2 JP 3647546 B2 JP3647546 B2 JP 3647546B2 JP 08380696 A JP08380696 A JP 08380696A JP 8380696 A JP8380696 A JP 8380696A JP 3647546 B2 JP3647546 B2 JP 3647546B2
- Authority
- JP
- Japan
- Prior art keywords
- double
- adhesive tape
- sided adhesive
- nonwoven fabric
- sided
- 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)
- Adhesives Or Adhesive Processes (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、両面接着テープに関する。さらに詳しくは、プラスチックや金属等の被着体に貼り合わせた両面接着テープを剥離するときに、両面接着テープが剥離途中で切れたり、粘着剤が被着体の表面に残ったりすることのない剥離性に優れた両面接着テープに関する。
【０００２】
【従来の技術】
両面接着テープは、作業性が良好で接着特性の信頼性が高い接合手段として家電製品や自動車、ＯＡ機器等の各種産業分野にて利用されている。また近年、省資源の観点から、製品に使用されているリサイクル可能な部品については使用後に製品を分解して再利用することが多くなってきている。このとき、両面接着テープを使用して部品を接合している場合には、部品に貼り付けられた両面接着テープを剥離する作業が必要になることがある。
【０００３】
【発明が解決しようとする課題】
しかしながら、一般的に両面接着テープを被着体から剥離する作業は困難であることが多い。
例えば、レーヨン繊維からなる不織布を基材とする両面接着テープの場合は、剥離時に両面接着テープを引っ張るとすぐにテープが切れてしまうという問題があった。
また、長期間被着体に貼り付けらた両面接着テープは、被着体表面に粘着剤を残した状態（いわゆる、糊残り）で剥離されることがあり、被着体表面に付着した粘着剤を溶剤などで拭き取らなければならない等、両面接着テープの剥離作業を困難なものにしていた。
【０００４】
一方で上記問題点を解決するための手段として、特開平７−７０５２７号公報には、マニラ麻を主成分とし、縦方向及び横方向の引張強度がそれぞれ１kg／15mm以上である不織布基材の両面に粘着剤層が設けられ、少なくとも一方の面の粘着剤層が水溶性粘着剤層であることを特徴とする両面粘着テープが提案されている。しかしながらこの両面粘着テープは被着体から剥離する場合に水溶性粘着剤層を水と接触させて粘着剤層を水に溶解させる必要があり、剥離作業が煩雑になるといった問題があった。
【０００５】
本発明は、上記従来の事情に鑑み、被着体に貼り付けられた両面接着テープを剥離する際に、両面接着テープが切れたり、粘着剤が被着体に残ることのない、剥離性の優れた両面接着テープを得ることを目的としている。
【０００６】
【課題を解決するための手段】
本発明者らは上記の問題点を解決するために鋭意研究した結果、特定の物性値を有するマニラ麻パルプのみからなる不織布と特定範囲の貯蔵弾性率（Ｇ’）を有するアクリル系粘着剤を組み合わせて両面接着テープを作製することによって、上記問題点が解決できることを見いだし、本発明に至ったものである。
【０００７】
即ち本発明の両面接着テープは、前記課題を達成するために、下記のＡ）〜Ｅ）の物性を有するマニラ麻のみからなる不織布の両面に、５０℃での貯蔵弾性率（Ｇ’）が４．５×１０5 〜６．０×１０5 dyne／cm2 であるアクリル系粘着剤を設けた構成を有するものである。
Ａ）グレーン比が８０％以上
Ｂ）引裂強さが５０〜８０gf
Ｃ）引張強さが１〜２ kgf／15mm
Ｄ）ＭＤ方向とＴＤ方向の伸びの差が５０％以下
Ｅ）透気度が０．３ sec以下
【０００８】
また、本発明の両面接着テープは、両面接着テープのＭＤ方向の引張強さとＴＤ方向の引張強さの差が０．５ kgf／10mm以下であり、かつ、両面接着テープのＭＤ方向とＴＤ方向の伸びの差が３０％以下であることが好ましい。
【０００９】
【発明の実施の形態】
本発明における両面接着テープの基材にはマニラ麻のみからなる不織布が使用される。ここで、マニラ麻のみからなる不織布とは、不織布を構成する原料としてマニラ麻繊維のみが使用され、さらに不織布製造時に繊維同士を結合させるための手段がマニラ麻繊維同士の絡み合いだけで行われたものであり、通常不織布製造時に繊維同士を結合するために行われる、ビスコースなどを使用した樹脂含浸処理が施されていないもののことをいう。本発明者らは、上記のマニラ麻のみからなる不織布に粘着剤を塗布した場合、通常の樹脂含浸加工を行った不織布に比べて粘着剤が繊維同士の隙間に進入しやすくなり、粘着剤が繊維同士の結合剤として作用する結果、両面接着テープの強度が増加しうることを見出したものである。
【００１０】
さらに本発明の両面接着テープの基材として使用されるマニラ麻のみからなる不織布（以下、単に不織布と称す。）は上記の方法にて作製されたものであり、かつ、以下のＡ）〜Ｅ）で示される物性の全てを満足するものでなければならない。
【００１１】
Ａ）不織布のグレーン比が８０％以上、好ましくは９０〜１００％である。グレーン比が８０％よりも小さくなると不織布のＭＤ方向とＴＤ方向の強度や伸びの等方性がなくなり、かかる不織布を両面接着テープの基材として使用した場合、両面接着テープを被着体から剥離する際に不織布の強度が弱い方向に沿って切れ易くなる原因となる。なお、本発明においてグレーン比とは、不織布のＭＤ方向の引張強さとＴＤ方向の引張強さの比のことである。
【００１２】
Ｂ）不織布の引裂強さが５０〜８０gfである。引裂強さが５０gfよりも小さくなると従来から使用されている不織布と同様に被着体に貼り合わせられた両面接着テープを剥離する際に切れ易くなる。また引裂強さが８０gfよりも大きくなると不織布の繊維密度が高くなるため、粘着加工時における粘着剤の不織布への含浸性が悪くなり、特に、両面接着テープを被着体から剥離する際に被着体表面に粘着剤を残す原因となる。ここで不織布の引裂強さはＪＩＳ−Ｐ−８１１６法により測定した。
【００１３】
Ｃ）不織布の引張強さが１〜２ kgf／15mmである。引張強さが１ kgf／15mmよりも小さくなると従来から使用されている不織布と同様に被着体に貼り合わせられた両面接着テープを剥離する際に切れ易くなる。また引張強さが２ kgf／15mmよりも大きくなると不織布の繊維密度が高くなるため、粘着加工時における粘着剤の不織布への含浸性が悪くなり、特に両面接着テープを被着体から剥離する際に被着体表面に粘着剤を残す原因となる。ここで不織布の引裂強さはＪＩＳ−Ｐ−８１１３法により測定した。
【００１４】
Ｄ）不織布のＭＤ方向とＴＤ方向の伸びの差が５０％以下、好ましくは３０％以下、さらに好ましくは０％である。ここで、ＭＤ方向とＴＤ方向の伸びの差とは、ＪＩＳ−Ｐ−８１３２法に準じて測定した不織布のＭＤ方向（流れ方向）の伸びの値とＴＤ方向（幅方向）の伸びの値を下記の式１に代入することによって算出される値のことである。本発明に使用される不織布はＭＤ方向の伸びとＴＤ方向の伸びが等しいことが好ましく、具体的には、ＭＤ方向とＴＤ方向の伸びの差が上記の規定を満足することが必要である。ＭＤ方向とＴＤ方向の伸びの差が上記の規定を満足しない不織布を両面接着テープの基材として使用した場合は、両面接着テープを被着体から剥離する際にテープが切れ易くなる原因となったり、両面接着テープを加工する際の寸法安定性が損なわれる原因となったりすることがある。
【００１５】
【数１】
Ｅ）不織布の透気度が０．３ sec以下、好ましくは０．２ sec以下である。不織布の透気度が０．３ secよりも大きくなると、不織布に粘着剤を塗布する際の、粘着剤の不織布への含浸性が低下し、両面接着テープの強度が不十分なものとなる場合がある。
なお、不織布の透気度はＪＩＳ−Ｐ−８１１７法により測定した。
【００１７】
本発明において使用される不織布としては上記Ａ）〜Ｅ）で規定される物性の全てを満足するものであることが必要であり、上記Ａ）〜Ｅ）で規定される物性の一部を満足していたとしても、他の物性が一致しない場合は剥離性と糊残り性を満足することのできる両面接着テープを得ることができなくなる。
【００１８】
不織布の厚さは特に限定されないが、通常８０μｍ以下、就中３０〜６０μｍであることが好ましい。
【００１９】
不織布の両面に設けられる粘着剤としては、両面接着テープが被着体に長期間貼り付けられた場合でも、両面接着テープが剥がされる時に粘着剤が被着体表面に残らないことが必要である。
本発明者らは上記の点を鑑みて粘着剤を種々検討した結果、アクリル系粘着剤がゴム系粘着剤に比べて本発明には有利であること、さらに、アクリル系粘着剤の中でも５０℃における貯蔵弾性率（Ｇ’）の値が以下に規定する特定範囲に入る粘着剤が糊残り現象を防止するのに極めて有効であることを見いだした。
【００２０】
すなわち、本発明の両面接着テープにおいて不織布の両面に設けられるアクリル系粘着剤は、５０℃における貯蔵弾性率（Ｇ’）が４．５×１０5 〜６．０×１０5 dyne／cm2 であることが必要である。
５０℃における貯蔵弾性率が上記の範囲内であるアクリル系粘着剤を使用することによって、両面接着テープが長期間被着体に貼り付けられていても、両面接着テープを糊残りすることなく剥がすことができる。
５０℃における貯蔵弾性率（Ｇ’）が４．５×１０5 dyne／cm2 未満では、両面接着テープが長期間被着体に貼り付けられた場合に、被着体界面での結合力（接着力）が粘着剤内部の凝集力よりも大きくなり、両面接着テープを被着体から剥離する際に粘着剤層が凝集破壊を起こし糊残り現象が発生し易くなる。
また、５０℃における貯蔵弾性率（Ｇ’）が６．０×１０5 dyne／cm2 を超えると粘着剤が硬くなりすぎて接着特性が低下するため好ましくない。
【００２１】
アクリル系粘着剤は、５０℃における貯蔵弾性率（Ｇ’）の値が上記で規定した範囲内であるものであれば特に限定されず、公知のアクリル系粘着剤が適宜使用される。かかるアクリル系粘着剤としては例えば、（メタ）アクリル酸アルキルエステルとこれと共重合可能な他の不飽和単量体との共重合物からなるアクリル系ポリマーをベースポリマーとし、これに必要に応じて架橋剤や粘着付与剤樹脂などの添加剤が配合されたものが使用される。
【００２２】
なお、本発明においてアクリル系粘着剤の貯蔵弾性率（Ｇ’）とは、上記アクリル系粘着剤の剪断貯蔵弾性率のことであり、レオメトリック社製の動的粘弾性測定装置ＲＤＳ−IIを用い、厚さ約１．５mmのアクリル系粘着剤をサンプルとし、直径７．９mmのパラレルプレートの治具により、周波数１Ｈｚで測定される値である。
【００２３】
本発明の両面接着テープは、不織布の両面にアクリル系粘着剤層が設けられた構成を有する。両面接着テープの製造方法は公知の方法が適宜使用される。この製造方法としては、例えば、不織布に直接アクリル系粘着剤を塗布し乾燥させる直写法や剥離ライナーにアクリル系粘着剤を塗布し乾燥させた後、不織布と貼り合わせる転写法などがある。
【００２４】
不織布に設けられるアクリル系粘着剤層の厚さは、通常３０〜１００μｍ、就中５０〜８０μｍであることが好ましい。
【００２５】
本発明の両面接着テープは、両面接着テープのＭＤ方向の引張強さとＴＤ方向の引張強さの差が０．５ kgf／10mm以下、好ましくは０ kgf／10mmであり、かつ、両面接着テープのＭＤ方向とＴＤ方向の伸びの差が３０％以下、好ましくは０％であることが望ましい。ここでＭＤ方向とＴＤ方向の伸びの差とは、後述の測定方法に準じて測定した両面接着テープのＭＤ方向の伸びの値とＴＤ方向の伸びの値を前述の式１に代入することによって算出される値のことである。
両面接着テープの引張強さと伸びの物性が上記で規定する範囲を超えて、ＭＤ方向とＴＤ方向で大きく異なる場合は、両面接着テープを被着体から剥離するときに両面接着テープが切れ易くなることがある。
【００２６】
【実施例】
以下に具体的実施例を挙げて本発明を説明するが、本発明はこれら実施例に何ら限定されるものではない。
【００２７】
（実施例１）
マニラ麻のみからなる不織布（グレーン比：９０％、引裂強さ：６０gf、引張強さ：１．５kgf/15mm、ＭＤ方向とＴＤ方向の伸びの差が１０％、透気度：０．１５sec 、厚さ：５０μｍ）の両面に５０℃における貯蔵弾性率（Ｇ’）が５．０×１０5 dyne／cm2 であるアクリル系粘着剤を各々５５μｍの厚みで塗布し（両面接着テープの総厚１６０μｍ）本発明の両面接着テープを作製した。
【００２８】
（比較例１）
基材に、レーヨン繊維からなる厚さ５０μｍの不織布を使用した以外は実施例１と同様にして両面接着テープを作製した。
【００２９】
（比較例２）
粘着剤に、ＳＩＳ系のゴム系粘着剤を使用した以外は実施例１と同様にして両面接着テープを作製した。
【００３０】
実施例および比較例で得られた両面接着テープについて以下に示す評価を行った。
【００３１】
＜両面接着テープの引張強さと伸び＞
両面接着テープのＭＤ方向（流れ方向）とＴＤ方向（幅方向）からそれぞれ１０mm幅でサンプルを切断した。引張試験機を使用して、つかみ間隔５０mm、引張速度５０mm／ minで両面接着テープを引っ張り、両面接着テープが切断した時の強度（引張強さ）および伸びを測定した。
【００３２】
＜接着力・剥離性・糊残り性＞
両面接着テープの片面に厚さ５mmのウレタンフォームを貼り合わせたサンプルを２０mm幅で切断した。サンドペーパー（＃２８０）にて表面研磨したＳＵＳ−３０４板に上記サンプルを２kgの荷重ローラで１往復させて圧着させた後、常温にて３０分放置後、さらにサンシャインウェザーメーターに１ヵ月間投入した。サンプルをサンシャインウェザーメーターから取り出し、常温でエージングさせた後、ＪＩＳ−Ｚ−０２３７法に準じ、引張試験機を使用して引張速度３００mm／ min、１８０°剥離で接着力を測定した。この時、剥離中に両面接着テープが切断した場合を剥離性が×とした。また、粘着剤がＳＵＳ−３０４板の表面上に残った状態で剥離した場合を糊残り性が×として評価を行った。
【００３３】
評価結果を表１に示す。
【００３４】
【表１】
表１からわかるように、本発明において規定した特定のマニラ麻のみからなる不織布と特定のアクリル系粘着剤を使用した実施例１の両面接着テープは、高い接着力を有していながら、剥離時に両面接着テープが切断することがない。さらに、両面接着テープを長期間被着体に貼り付けた後でも、粘着剤を被着体表面に残すことなくテープを剥離することができる。
【００３６】
【発明の効果】
本発明の両面接着テープは上記の構成を有しているので、プラスチックや金属等の各種被着体に貼り付けた両面接着テープを剥離する場合に、剥離途中で両面接着テープが切れたり、被着体に粘着剤を残すことがない。
従って、部品などに貼り付けられ、不要となった両面接着テープを通常の剥離作業で簡単に剥がすことができるようになる。特に本発明の両面接着テープは、リサイクル可能な部品を使用している製品のように、長期間両面接着テープが貼り付けられた部品からテープを剥離する作業が必要となる場合に剥離作業の省力化を図ることができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a double-sided adhesive tape. More specifically, when the double-sided adhesive tape attached to the adherend such as plastic or metal is peeled off, the double-sided adhesive tape does not break during the peeling or the adhesive remains on the surface of the adherend. The present invention relates to a double-sided adhesive tape excellent in peelability.
[0002]
[Prior art]
Double-sided adhesive tapes are used in various industrial fields such as home appliances, automobiles, and office automation equipment as joining means with good workability and high adhesive property reliability. In recent years, from the viewpoint of resource saving, recyclable parts used in products are often disassembled and reused after use. At this time, when components are joined using a double-sided adhesive tape, an operation of peeling the double-sided adhesive tape affixed to the component may be required.
[0003]
[Problems to be solved by the invention]
However, generally, the operation of peeling the double-sided adhesive tape from the adherend is often difficult.
For example, in the case of a double-sided adhesive tape having a non-woven fabric made of rayon fiber as a base material, there is a problem that the tape breaks immediately when the double-sided adhesive tape is pulled at the time of peeling.
In addition, the double-sided adhesive tape that has been affixed to the adherend for a long period of time may be peeled off with the adhesive remaining on the adherend surface (so-called adhesive residue), and the adhesive that adheres to the adherend surface. It was difficult to peel off the double-sided adhesive tape, for example, the agent had to be wiped off with a solvent.
[0004]
On the other hand, as means for solving the above problems, Japanese Patent Application Laid-Open No. 7-70527 discloses both surfaces of a nonwoven fabric base material containing Manila hemp as a main component and having a tensile strength in the longitudinal and transverse directions of 1 kg / 15 mm or more. There has been proposed a double-sided pressure-sensitive adhesive tape characterized in that a pressure-sensitive adhesive layer is provided, and the pressure-sensitive adhesive layer on at least one surface is a water-soluble pressure-sensitive adhesive layer. However, when this double-sided pressure-sensitive adhesive tape is peeled off from the adherend, it is necessary to bring the water-soluble pressure-sensitive adhesive layer into contact with water and dissolve the pressure-sensitive adhesive layer in water, which causes a problem that the peeling work becomes complicated.
[0005]
In view of the above-described conventional circumstances, the present invention provides a peelable adhesive that does not break the double-sided adhesive tape or leave the adhesive on the adherend when peeling the double-sided adhesive tape attached to the adherend. The purpose is to obtain an excellent double-sided adhesive tape.
[0006]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventors have combined a non-woven fabric consisting only of Manila hemp pulp having specific physical properties and an acrylic pressure-sensitive adhesive having a specific range of storage elastic modulus (G ′). Thus, it was found that the above problems can be solved by producing a double-sided adhesive tape, and the present invention has been achieved.
[0007]
That is, in order to achieve the above object, the double-sided adhesive tape of the present invention has a storage elastic modulus (G ′) of 4 at 50 ° C. on both surfaces of a nonwoven fabric made only of Manila hemp having the following physical properties A) to E). It has a configuration in which an acrylic pressure-sensitive adhesive having a density of 5 × 10 5 to 6.0 × 10 5 dyne / cm 2 is provided.
A) Grain ratio is 80% or more B) Tear strength is 50-80gf
C) Tensile strength is 1-2 kgf / 15mm
D) Difference in elongation between MD direction and TD direction is 50% or less E) Air permeability is 0.3 sec or less
In the double-sided adhesive tape of the present invention, the difference between the tensile strength in the MD direction and the tensile strength in the TD direction of the double-sided adhesive tape is 0.5 kgf / 10 mm or less, and the MD direction and the TD direction of the double-sided adhesive tape. It is preferable that the difference in elongation is 30% or less.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The base material of the double-sided adhesive tape in the present invention is a non-woven fabric made only of Manila hemp. Here, the nonwoven fabric made only of Manila hemp is one in which only the Manila hemp fiber is used as a raw material constituting the nonwoven fabric, and means for bonding the fibers at the time of manufacturing the nonwoven fabric is performed only by entanglement of the Manila hemp fibers. It means that the resin impregnation treatment using viscose or the like, which is usually performed for bonding fibers during the production of a nonwoven fabric, has not been performed. When the adhesive is applied to the above-mentioned nonwoven fabric made only of Manila hemp, the adhesive is more likely to enter the gap between the fibers compared to the nonwoven fabric subjected to normal resin impregnation processing, and the adhesive is the fiber. As a result of acting as a binder between each other, it has been found that the strength of the double-sided adhesive tape can be increased.
[0010]
Furthermore, a nonwoven fabric (hereinafter simply referred to as a nonwoven fabric) made only of Manila hemp used as a base material of the double-sided adhesive tape of the present invention is produced by the above method, and the following A) to E): It must satisfy all the physical properties indicated by.
[0011]
A) The grain ratio of the nonwoven fabric is 80% or more, preferably 90 to 100%. When the grain ratio is less than 80%, the nonwoven fabric has no isotropic strength and elongation in the MD and TD directions. When such a nonwoven fabric is used as a base material for a double-sided adhesive tape, the double-sided adhesive tape is peeled off from the adherend. When it does, it becomes a cause which becomes easy to cut | disconnect along the direction where the intensity | strength of a nonwoven fabric is weak. In the present invention, the grain ratio is the ratio of the tensile strength in the MD direction and the tensile strength in the TD direction of the nonwoven fabric.
[0012]
B) The tear strength of the nonwoven fabric is 50 to 80 gf. When the tear strength is less than 50 gf, the double-sided adhesive tape bonded to the adherend is easily cut when peeled off as in the case of conventionally used nonwoven fabrics. In addition, when the tear strength is greater than 80 gf, the fiber density of the nonwoven fabric increases, so that the impregnation property of the adhesive to the nonwoven fabric during the adhesive processing deteriorates, and particularly when the double-sided adhesive tape is peeled off from the adherend. It causes the adhesive to remain on the surface of the body. Here, the tear strength of the nonwoven fabric was measured by the JIS-P-8116 method.
[0013]
C) The tensile strength of the nonwoven fabric is 1 to 2 kgf / 15 mm. When the tensile strength is less than 1 kgf / 15 mm, the double-sided adhesive tape attached to the adherend is easily cut when peeled off as in the case of conventionally used nonwoven fabrics. Also, if the tensile strength is greater than 2 kgf / 15mm, the fiber density of the nonwoven fabric increases, so the impregnation of the adhesive into the nonwoven fabric during adhesive processing deteriorates, especially when the double-sided adhesive tape is peeled off from the adherend. Cause the adhesive to remain on the adherend surface. Here, the tear strength of the nonwoven fabric was measured by the JIS-P-8113 method.
[0014]
D) The difference in elongation between the MD direction and the TD direction of the nonwoven fabric is 50% or less, preferably 30% or less, more preferably 0%. Here, the difference in elongation between the MD direction and the TD direction refers to the elongation value in the MD direction (flow direction) and the elongation value in the TD direction (width direction) of the nonwoven fabric measured according to the JIS-P-8132 method. It is a value calculated by substituting into the following formula 1. The nonwoven fabric used in the present invention preferably has the same elongation in the MD direction and in the TD direction. Specifically, it is necessary that the difference between the elongation in the MD direction and the TD direction satisfies the above definition. When a nonwoven fabric in which the difference in elongation between the MD direction and the TD direction does not satisfy the above-mentioned rule is used as the base material of the double-sided adhesive tape, it becomes a cause that the tape is easily cut when the double-sided adhesive tape is peeled from the adherend. Or dimensional stability at the time of processing the double-sided adhesive tape may be impaired.
[0015]
[Expression 1]
E) The air permeability of the nonwoven fabric is 0.3 sec or less, preferably 0.2 sec or less. When the air permeability of the nonwoven fabric is greater than 0.3 sec, the impregnation property of the adhesive to the nonwoven fabric when applying the adhesive to the nonwoven fabric decreases and the strength of the double-sided adhesive tape becomes insufficient There is.
In addition, the air permeability of the nonwoven fabric was measured by JIS-P-8117 method.
[0017]
The nonwoven fabric used in the present invention is required to satisfy all of the physical properties defined in the above A) to E), and partially satisfies the physical properties defined in the above A) to E). Even if it does, when other physical properties do not correspond, it becomes impossible to obtain a double-sided adhesive tape that can satisfy peelability and adhesive residue.
[0018]
Although the thickness of a nonwoven fabric is not specifically limited, Usually, it is 80 micrometers or less, and it is preferable that it is 30-60 micrometers especially.
[0019]
As a pressure-sensitive adhesive provided on both surfaces of the nonwoven fabric, it is necessary that the pressure-sensitive adhesive does not remain on the surface of the adherend when the double-sided adhesive tape is peeled off even when the double-sided adhesive tape is applied to the adherend for a long time. .
As a result of various studies on pressure-sensitive adhesives in view of the above points, the present inventors have found that acrylic pressure-sensitive adhesives are more advantageous for the present invention than rubber-based pressure-sensitive adhesives. It was found that a pressure-sensitive adhesive having a storage elastic modulus (G ′) value in the range specified below is extremely effective in preventing the adhesive residue phenomenon.
[0020]
That is, the acrylic adhesive provided on both sides of the nonwoven fabric in the double-sided adhesive tape of the present invention has a storage elastic modulus (G ′) at 50 ° C. of 4.5 × 10 5 to 6.0 × 10 5 dyne / cm 2 . It is necessary to be.
By using an acrylic pressure-sensitive adhesive having a storage elastic modulus at 50 ° C. within the above range, the double-sided adhesive tape is peeled off without leaving any adhesive even if the double-sided adhesive tape has been applied to the adherend for a long period of time. be able to.
When the storage elastic modulus (G ′) at 50 ° C. is less than 4.5 × 10 5 dyne / cm 2 , when the double-sided adhesive tape is applied to the adherend for a long period of time, the bond strength at the adherend interface ( Adhesive force) is larger than the cohesive force inside the pressure-sensitive adhesive, and the pressure-sensitive adhesive layer easily causes cohesive failure when the double-sided adhesive tape is peeled off from the adherend, so that an adhesive residue phenomenon is likely to occur.
On the other hand, if the storage elastic modulus (G ′) at 50 ° C. exceeds 6.0 × 10 5 dyne / cm 2 , the pressure-sensitive adhesive becomes too hard and the adhesive properties deteriorate, which is not preferable.
[0021]
The acrylic pressure-sensitive adhesive is not particularly limited as long as the value of the storage elastic modulus (G ′) at 50 ° C. is within the range specified above, and a known acrylic pressure-sensitive adhesive is appropriately used. As such an acrylic pressure-sensitive adhesive, for example, an acrylic polymer composed of a copolymer of (meth) acrylic acid alkyl ester and another unsaturated monomer copolymerizable therewith is used as a base polymer, and if necessary, In other words, those containing additives such as cross-linking agents and tackifier resins are used.
[0022]
In the present invention, the storage elastic modulus (G ′) of the acrylic pressure-sensitive adhesive is the shear storage elastic modulus of the acrylic pressure-sensitive adhesive, and the dynamic viscoelasticity measuring device RDS-II manufactured by Rheometric is used. It is a value measured at a frequency of 1 Hz with a parallel plate jig having a diameter of 7.9 mm, using an acrylic adhesive having a thickness of about 1.5 mm as a sample.
[0023]
The double-sided adhesive tape of this invention has the structure by which the acrylic adhesive layer was provided in both surfaces of the nonwoven fabric. A known method is appropriately used as a method for producing the double-sided adhesive tape. Examples of the production method include a direct copying method in which an acrylic pressure-sensitive adhesive is directly applied to a nonwoven fabric and dried, and a transfer method in which an acrylic pressure-sensitive adhesive is applied to a release liner and dried, and then bonded to the nonwoven fabric.
[0024]
The thickness of the acrylic pressure-sensitive adhesive layer provided on the nonwoven fabric is usually 30 to 100 μm, and preferably 50 to 80 μm.
[0025]
The double-sided adhesive tape of the present invention has a difference between the tensile strength in the MD direction and the tensile strength in the TD direction of the double-sided adhesive tape of 0.5 kgf / 10 mm or less, preferably 0 kgf / 10 mm. The difference in elongation between the MD direction and the TD direction is 30% or less, preferably 0%. Here, the difference in elongation in the MD direction and the TD direction is obtained by substituting the value of elongation in the MD direction and the value of elongation in the TD direction of the double-sided adhesive tape measured according to the measurement method described later into the above-described equation 1. It is a calculated value.
If the tensile strength and elongation properties of the double-sided adhesive tape exceed the ranges specified above, and the MD and TD directions differ greatly, the double-sided adhesive tape will be easily cut when the double-sided adhesive tape is peeled off from the adherend. Sometimes.
[0026]
【Example】
The present invention will be described below with reference to specific examples, but the present invention is not limited to these examples.
[0027]
(Example 1)
Nonwoven fabric made only of Manila hemp (Grain ratio: 90%, tear strength: 60 gf, tensile strength: 1.5 kgf / 15 mm, difference in elongation between MD and TD directions is 10%, air permeability: 0.15 sec, thickness An acrylic adhesive having a storage elastic modulus (G ′) at 50 ° C. of 5.0 × 10 5 dyne / cm 2 is applied to both surfaces of 55 μm in thickness (total thickness of double-sided adhesive tape: 160 μm). ) A double-sided adhesive tape of the present invention was produced.
[0028]
(Comparative Example 1)
A double-sided adhesive tape was prepared in the same manner as in Example 1 except that a 50 μm-thick nonwoven fabric made of rayon fibers was used as the substrate.
[0029]
(Comparative Example 2)
A double-sided adhesive tape was prepared in the same manner as in Example 1 except that a SIS rubber adhesive was used as the adhesive.
[0030]
The double-sided adhesive tapes obtained in the examples and comparative examples were evaluated as follows.
[0031]
<Tensile strength and elongation of double-sided adhesive tape>
A sample was cut at a width of 10 mm from the MD direction (flow direction) and the TD direction (width direction) of the double-sided adhesive tape. Using a tensile tester, the double-sided adhesive tape was pulled at a grip interval of 50 mm and a tensile speed of 50 mm / min, and the strength (tensile strength) and elongation when the double-sided adhesive tape was cut were measured.
[0032]
<Adhesive strength, peelability, adhesive residue>
A sample in which a 5 mm thick urethane foam was bonded to one side of a double-sided adhesive tape was cut to a width of 20 mm. The above sample was reciprocated once with a 2 kg load roller on a SUS-304 plate that had been surface-polished with sandpaper (# 280), allowed to stand at room temperature for 30 minutes, and then put into a sunshine weather meter for one month. did. The sample was taken out of the sunshine weather meter and aged at room temperature, and then the adhesive strength was measured at a tensile rate of 300 mm / min and 180 ° peeling using a tensile tester according to JIS-Z-0237 method. At this time, when the double-sided adhesive tape was cut during peeling, the peelability was defined as x. Moreover, the adhesive remaining property evaluated as the case where it peeled in the state in which the adhesive remained on the surface of the SUS-304 board.
[0033]
The evaluation results are shown in Table 1.
[0034]
[Table 1]
As can be seen from Table 1, the double-sided adhesive tape of Example 1 using a non-woven fabric consisting only of the specific Manila hemp as defined in the present invention and a specific acrylic pressure-sensitive adhesive has a high adhesive force and is double-sided at the time of peeling. The adhesive tape does not cut. Further, even after the double-sided adhesive tape has been applied to the adherend for a long time, the tape can be peeled without leaving the adhesive on the adherend surface.
[0036]
【The invention's effect】
Since the double-sided adhesive tape of the present invention has the above-described configuration, when the double-sided adhesive tape attached to various adherends such as plastic and metal is peeled off, There is no adhesive left on the body.
Therefore, the double-sided adhesive tape that has been affixed to a component or the like and becomes unnecessary can be easily peeled off by a normal peeling operation. In particular, the double-sided adhesive tape of the present invention saves the peeling work when it is necessary to remove the tape from a part to which the double-sided adhesive tape has been applied for a long time, such as a product using recyclable parts. Can be achieved.
Claims (2)
Ａ）グレーン比が８０％以上
Ｂ）引裂強さが５０〜８０gf
Ｃ）引張強さが１〜２ kgf／15mm
Ｄ）ＭＤ方向とＴＤ方向の伸びの差が５０％以下
Ｅ）透気度が０．３ sec以下In the double-sided adhesive tape in which an acrylic pressure-sensitive adhesive is provided on both surfaces of the base material, the base material is a non-woven fabric made only of Manila hemp having the following physical properties A) to E), and the acrylic pressure-sensitive adhesive at 50 ° C. A double-sided adhesive tape having a storage elastic modulus (G ′) of 4.5 × 10 5 to 6.0 × 10 5 dyne / cm 2 .
A) Grain ratio is 80% or more B) Tear strength is 50-80gf
C) Tensile strength is 1-2 kgf / 15mm
D) Difference in elongation between MD direction and TD direction is 50% or less E) Air permeability is 0.3 sec or less
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08380696A JP3647546B2 (en) | 1996-04-05 | 1996-04-05 | Double-sided adhesive tape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08380696A JP3647546B2 (en) | 1996-04-05 | 1996-04-05 | Double-sided adhesive tape |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09272850A JPH09272850A (en) | 1997-10-21 |
| JP3647546B2 true JP3647546B2 (en) | 2005-05-11 |
Family
ID=13812918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08380696A Expired - Lifetime JP3647546B2 (en) | 1996-04-05 | 1996-04-05 | Double-sided adhesive tape |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3647546B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60041632D1 (en) | 2000-03-30 | 2009-04-09 | Nitto Denko Corp | Water-permeable adhesive tape for semiconductor processing |
| KR20030013697A (en) * | 2001-08-09 | 2003-02-15 | 양재창 | Elastic double face adhesive tape |
| JP4711104B2 (en) * | 2003-08-20 | 2011-06-29 | Ｄｉｃ株式会社 | Removable double-sided adhesive tape |
| JP3765497B2 (en) | 2004-03-17 | 2006-04-12 | 日東電工株式会社 | Acrylic adhesive composition and adhesive tape |
| JP4841372B2 (en) * | 2006-09-21 | 2011-12-21 | 日東電工株式会社 | Double-sided adhesive tape |
| JP2008297376A (en) * | 2007-05-30 | 2008-12-11 | Mitsui Chemicals Inc | Adhesive sheet for optical filter of display |
| JP5513073B2 (en) * | 2009-10-28 | 2014-06-04 | 日東電工株式会社 | Double-sided adhesive tape and method for producing the same |
| JP6050689B2 (en) * | 2012-01-25 | 2016-12-21 | 日東電工株式会社 | Double-sided adhesive sheet |
-
1996
- 1996-04-05 JP JP08380696A patent/JP3647546B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09272850A (en) | 1997-10-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU645424B2 (en) | Release liner | |
| JP4647913B2 (en) | Adhesive foamed articles | |
| JP4912635B2 (en) | Sticking member and optical part sticking method | |
| JP5265845B2 (en) | Double-sided adhesive tape | |
| JP2004525209A (en) | Pressure-sensitive adhesive with fiber reinforcement | |
| JP5441575B2 (en) | Double-sided pressure-sensitive adhesive sheet and method for producing the same | |
| JP3647546B2 (en) | Double-sided adhesive tape | |
| US20110097958A1 (en) | Double-sided adhesive tape and process for producing the same | |
| JP3678617B2 (en) | Double-sided adhesive tape | |
| JP4240891B2 (en) | Removable double-sided adhesive tape | |
| JP2006143856A (en) | Double-sided adhesive tape and its manufacturing method | |
| JPH10245534A (en) | Reinforced pressure-sensitive adhesive tape | |
| JP2000319614A (en) | Double-sided adhesive tape | |
| JP2000265140A (en) | Pressure-sensitive adhesive double coated tape for recycling molded article | |
| JP6050689B2 (en) | Double-sided adhesive sheet | |
| JP2014040614A (en) | Pressure-sensitive adhesive compositions and pressure-sensitive adhesive tape | |
| JPH0770527A (en) | Double face pressure-sensitive adhesive tape | |
| JP2000218204A (en) | Masking tape or sheet for coating | |
| JP2003147292A (en) | Double-sided self-adhesive tape | |
| JP2000303041A (en) | Excellently releasable, double-faced pressure-sensitive adhesive tape | |
| JP4711104B2 (en) | Removable double-sided adhesive tape | |
| JPH09125021A (en) | Pressure-sensitive adhesive tape having repeated adhesiveness | |
| JP2001200218A (en) | Water releasable double-coated tape | |
| JP2003342544A (en) | Double-sided adhesive tape | |
| JP2000265143A (en) | Pressure-sensitive adhesive double coated tape for recycling molded article |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20041129 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20050201 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20050209 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080218 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110218 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140218 Year of fee payment: 9 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |