JP5408956B2 - Adhesive tape - Google Patents

Adhesive tape Download PDF

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Publication number
JP5408956B2
JP5408956B2 JP2008271539A JP2008271539A JP5408956B2 JP 5408956 B2 JP5408956 B2 JP 5408956B2 JP 2008271539 A JP2008271539 A JP 2008271539A JP 2008271539 A JP2008271539 A JP 2008271539A JP 5408956 B2 JP5408956 B2 JP 5408956B2
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water
pressure
sensitive adhesive
adhesive layer
swellable
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JP2010100688A (en
Inventor
和成 柴田
良成 里田
崇 西川
隆久 小川
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Nitoms Inc
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Nitoms Inc
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Priority to JP2008271539A priority Critical patent/JP5408956B2/en
Priority to PCT/JP2009/004900 priority patent/WO2010047041A1/en
Priority to CN200980142760.3A priority patent/CN102197104B/en
Priority to KR1020117009302A priority patent/KR101617699B1/en
Publication of JP2010100688A publication Critical patent/JP2010100688A/en
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/26—Porous or cellular plastics
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/302—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/50—Additional features of adhesives in the form of films or foils characterized by process specific features
    • C09J2301/502—Additional features of adhesives in the form of films or foils characterized by process specific features process for debonding adherents

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Description

本発明は、水によって膨潤する水膨潤粘着剤が配合された粘着テープに関し、さらに詳しく言えば、一般的な家庭用粘着テープの粘着剤として水膨潤粘着剤を用いた粘着テープに関する。   The present invention relates to a pressure-sensitive adhesive tape containing a water-swelling pressure-sensitive adhesive that swells with water, and more specifically to a pressure-sensitive adhesive tape using a water-swelling pressure-sensitive adhesive as a pressure-sensitive adhesive for general household pressure-sensitive adhesive tapes.

通常、一般的な粘着テープの多くは、常時感圧接着性を有する粘着剤をシート状の基材の片面もしくは両面に塗布したものが一般的である。しかしながら、今までの粘着テープは、粘着テープを剥がす際に壁に糊残りが生じたり、劣化によって基材が切れたりするなどして、壁面から完全に剥がし取ることは困難であった。   Usually, many common pressure-sensitive adhesive tapes are obtained by applying a pressure-sensitive adhesive having a constant pressure-sensitive adhesive property on one or both sides of a sheet-like base material. However, conventional adhesive tapes have been difficult to completely remove from the wall surface due to adhesive residue on the wall when the adhesive tape is peeled off or the base material being cut due to deterioration.

他方において、水を用いて剥離できる感圧粘着剤が一部に知られている。この水を用いる感圧粘着剤には、水溶性のもの、水分散性のもの、そして水膨潤性の３種類がある。水溶性と水分散性の粘着剤は、水に完全に溶解（もしくは分散）するのに、大量の水と時間が必要となるため、製紙用ライナーテープなど一部の工業用途でしか用いられてない。   On the other hand, pressure-sensitive adhesives that can be peeled off using water are known in part. There are three types of pressure-sensitive adhesives that use water: water-soluble, water-dispersible, and water-swellable. Water-soluble and water-dispersible pressure-sensitive adhesives require only a large amount of water and time to completely dissolve (or disperse) in water, so they are only used in some industrial applications such as paper liner tape. Absent.

これに対して、水膨潤性粘着剤は、水を与えることでポリマー間に水が取り込まれ、粘着剤が膨潤し、その結果、体積変化（接着面積の変化）と接着界面への水の侵入などにより接着力が低下し、粘着剤を簡単に被接着面から剥がし取ることができる。例えば特許文献１参照。   In contrast, a water-swellable pressure-sensitive adhesive causes water to be taken in between the polymers by applying water, and the pressure-sensitive adhesive swells. As a result, the volume changes (changes in the bonding area) and the penetration of water into the bonding interface. As a result, the adhesive strength is reduced, and the pressure-sensitive adhesive can be easily peeled off from the adherend surface. For example, see Patent Document 1.

しかしながら、一般的な粘着テープの用途として水膨潤性粘着剤を用いた場合、次のような問題があった。すなわち、従来の粘着テープは、基材に例えばポリエステルなどの樹脂フィルムを用いており、これら基材に水膨潤性粘着剤を用いた場合、貼り付けた状態で粘着剤に水を含ませるためには、基材の周縁から水を徐々に染みこませていかなければならず、粘着剤が膨潤して粘着力が落ちるまでに非常に時間がかかる。
However, when a water-swellable pressure-sensitive adhesive is used as a general adhesive tape , there are the following problems. That is, the conventional adhesive tape uses, for example, a resin film such as polyester as a base material, and when a water-swellable adhesive is used for these base materials, in order to include water in the adhesive in a state of being attached. In this case, water must be gradually soaked from the periphery of the base material, and it takes a very long time for the adhesive to swell and lose its adhesive strength.

特開平７−１７３４４５号公報JP-A-7-173445

そこで、本発明は上述した課題を解決するためになされたものであって、一般家庭用の粘着テープの粘着剤として水膨潤性粘着剤を用いるのに際し、より剥がしやすい改良を施した粘着テープを提供することにある。   Therefore, the present invention has been made to solve the above-described problems, and when using a water-swellable pressure-sensitive adhesive as a pressure-sensitive adhesive for general household use, an adhesive tape that has been improved to be easily peeled off is used. It is to provide.

上述した目的を達成するため、本発明は以下に示すいくつかの特徴を備えている。請求項１に記載の発明は シート状の基材の一方の面に水を含むと膨潤して粘着力が低下する水膨潤性粘着剤を含む水膨潤性粘着剤層が形成された粘着テープにおいて、上記基材には、透水性を備える素材が用いられているとともに、上記基材の層間破壊強度が上記粘着剤の粘着強度より弱められており、上記基材が上記水膨潤性粘着剤層が被貼着面から剥がされる前に破壊されて上記破壊された基材の一部が上記水膨潤性粘着剤層とともに被貼着面側に残ることにより、上記水膨潤性粘着剤層に水を供給して上記貼着面から剥がす際に、上記基材の側から上記水膨潤性粘着剤層へ水を供給し得るしたことを特徴としている。
In order to achieve the above-described object, the present invention has several features described below. The invention according to claim 1 is a pressure-sensitive adhesive tape in which a water-swellable pressure-sensitive adhesive layer containing a water-swellable pressure-sensitive adhesive that swells and decreases its adhesive strength when water is contained on one surface of a sheet-like substrate is formed. The base material is made of a material having water permeability, the interlaminar fracture strength of the base material is weaker than the adhesive strength of the pressure-sensitive adhesive, and the base material is the water-swellable pressure-sensitive adhesive layer. Is destroyed before being peeled off from the adherend surface, and a part of the destroyed base material remains on the adherend surface side together with the water-swellable adhesive layer, so that the water-swellable adhesive layer has water. Is supplied to the water-swellable pressure-sensitive adhesive layer from the side of the base material when it is peeled off from the sticking surface .

請求項２に記載の発明は、上記請求項１において、上記水膨潤性粘着剤層は筋状に形成されており、上記筋状の水膨潤性粘着剤層の間に水を導くための導水路が設けられていることを特徴としている。
According to a second aspect of the present invention, in the first aspect, the water-swellable pressure-sensitive adhesive layer is formed in a streak shape, and a lead for guiding water between the streaky water-swellable pressure-sensitive adhesive layer. It is characterized by a water channel.

請求項３に記載の発明は、上記請求項１において、上記水膨潤性粘着剤層および／または上記基材には、透水孔が形成されていることを特徴としている。
According to a third aspect of the invention, in the first aspect, the above-mentioned water-swellable adhesive layer and / or the substrate, it is characterized in that permeability hole is formed.

請求項４に記載の発明は、上記請求項１において、上記基材は、連続気泡で発泡されていることを特徴としている。
According to a fourth aspect of the present invention, in the first aspect, the base material is foamed with open cells.

請求項５に記載の発明は、上記請求項１ないし４のいずれか１項において、上記基材自体が水を含むと膨潤する素材からなることを特徴としている。   A fifth aspect of the present invention is characterized in that, in any one of the first to fourth aspects, the base material itself is made of a material that swells when it contains water.

請求項６に記載の発明は、上記請求項１ないし５のいずれか１項において、上記基材の他方の面にも、粘着剤層が設けられていることを特徴としている。
A sixth aspect of the invention is characterized in that, in any one of the first to fifth aspects, an adhesive layer is also provided on the other surface of the base material.

請求項７に記載の発明は、上記請求項６において、上記他方の面に形成された粘着剤層にも、上記水膨潤粘着剤が配合されていることを特徴としている。
A seventh aspect of the invention is characterized in that, in the sixth aspect, the water-swelling pressure-sensitive adhesive is also blended in the pressure-sensitive adhesive layer formed on the other surface.

請求項１に記載の発明によれば、基材に透水性を有する素材を用いることにより、基材に素早く水を含ませ、そこから水膨潤性粘着剤に直接水を供給して、速やかに膨潤させて剥離することができる。また、基材の層間破壊強度が上記粘着剤の粘着強度よりも弱められていることにより、粘着テープを引き剥がすことで、基材が半分に割れるように破壊されて被接触面側に残る。そこで、破壊された基材の上から水をかけることによって、粘着剤層を素早く膨潤させることができる。本発明において、層間破壊強度とは、基材の厚さ方向の破壊強度をいう。
According to the first aspect of the present invention, by using a material having water permeability for the base material, water is quickly contained in the base material, and water is directly supplied to the water-swellable pressure-sensitive adhesive from there. It can be swollen and peeled off. Further, since the interlaminar fracture strength of the base material is weaker than the adhesive strength of the pressure-sensitive adhesive, by peeling off the adhesive tape, the base material is broken so as to be broken in half and remains on the contacted surface side. Therefore, the pressure-sensitive adhesive layer can be quickly swollen by applying water from above the destroyed substrate. In the present invention, the interlaminar fracture strength refers to the fracture strength in the thickness direction of the substrate.

請求項２に記載の発明によれば、粘着剤層を筋状に形成し、筋状の粘着剤層の間に水を導くための導水路を設けることにより、導水路に水を満たすことにより、速やかに粘着剤を膨潤させることができる。   According to the invention described in claim 2, by forming the pressure-sensitive adhesive layer in a streak shape and providing a water conduit for guiding water between the streaky adhesive layers, the water conduit is filled with water. , Can quickly swell the adhesive.

請求項３に記載の発明によれば、粘着剤層および／または基材に透水孔を形成することによっても、粘着剤層に直接水を供給して速やかに膨潤させることが可能となる。   According to the third aspect of the present invention, it is possible to supply water directly to the pressure-sensitive adhesive layer and swell quickly by forming water-permeable holes in the pressure-sensitive adhesive layer and / or the substrate.

請求項４に記載の発明によれば、粘着剤層が連続気泡となるように発泡されていることにより、粘着剤層の気泡内に水が蓄えられることにより、水膨潤性粘着剤を速やかに膨潤させて粘着力を落とすことができる。   According to the invention described in claim 4, since the pressure-sensitive adhesive layer is foamed so as to be open cells, water is stored in the bubbles of the pressure-sensitive adhesive layer, so that the water-swellable pressure-sensitive adhesive is quickly The adhesive strength can be reduced by swelling.

請求項５に記載の発明によれば、基材自体に水を含むと膨潤する素材を用いることにより、基材が水を含むことで、より粘着剤への水の供給が速やかに行えるばかりでなく、余った水を吸い取ることにより、被接着面に水が触れることをできるだけ抑えることができる。   According to the invention described in claim 5, by using a material that swells when the base material itself contains water, the base material contains water, so that the water can be supplied to the adhesive more quickly. In addition, it is possible to suppress as much as possible that the water adheres to the adherend surface by sucking off excess water.

請求項６および７に記載の発明によれば、基材の他方の面にも粘着剤層が設けられている、いわゆる両面粘着式の粘着テープであってもよく、片面もしくは両面の粘着剤層を水膨潤性粘着剤を用いて構成することにより、水を含ませるだけで簡単に剥がし取ることができる。
According to the invention described in claim 6 and 7, the pressure-sensitive adhesive layer on the other surface of the substrate is provided, it may be a pressure-sensitive adhesive tape of the so-called double-sided adhesive type, single-sided or double-sided pressure-sensitive adhesive layer By using a water-swellable pressure-sensitive adhesive, it can be easily peeled off simply by including water.

次に、本発明の実施形態について図面を参照しながら説明するが、本発明はこの限りではない。図１は、本発明の第１実施形態に係る粘着テープの使用状態を示す要部断面図であり、図２は、その変形例を表す（ａ）背面図および（ｂ）Ａ−Ａ線断面図である。図３は、さらに別の変形例を表す（ａ）背面図および（ｂ）Ｂ−Ｂ線断面図である。図４（ａ），（ｂ）は、基材の変形例を表す要部断面図である。   Next, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereto. FIG. 1 is a cross-sectional view of an essential part showing a use state of an adhesive tape according to a first embodiment of the present invention, and FIG. 2 shows a modification thereof (a) a rear view and (b) a cross section taken along line AA. FIG. FIG. 3A is a rear view and FIG. 3B is a cross-sectional view taken along the line BB showing still another modified example. 4 (a) and 4 (b) are cross-sectional views of the main part showing a modification of the base material.

図５は、基材の変形例を表す正面図である。図６は、本発明の第２実施形態に係る粘着テープの使用状態を表す要部断面図であり、図７は、その変形例を表す要部断面図である。図８は、第２実施形態の粘着テープの剥離手順の一例を表す模式図である。   FIG. 5 is a front view illustrating a modification of the base material. FIG. 6 is a main part sectional view showing a use state of the adhesive tape according to the second embodiment of the present invention, and FIG. 7 is a main part sectional view showing a modification thereof. FIG. 8 is a schematic diagram illustrating an example of a peeling procedure of the adhesive tape according to the second embodiment.

図１に示すように、第１実施形態の粘着テープ１は、シート状の基材２の一方の面（図１では左側面）に粘着剤層３が形成された片面粘着テープであり、粘着テープ１の他方の面（図１では右側面）には、フックＦが粘着部Ｆａを介して貼り付けられている。   As shown in FIG. 1, the adhesive tape 1 of 1st Embodiment is a single-sided adhesive tape in which the adhesive layer 3 was formed in the one surface (left side surface in FIG. 1) of the sheet-like base material 2, and is adhesive. A hook F is attached to the other surface of the tape 1 (the right side surface in FIG. 1) via an adhesive portion Fa.

この第１実施形態において、粘着テープ１は、フックＦを壁面に貼り付ける際に、直接、フックを貼り付けずに済む壁面保護テープを例にとって説明するが、壁面にポスターなどを貼り付ける際に用いられる一般的な事務用の粘着テープであってもよい。   In this first embodiment, the adhesive tape 1 will be described by taking a wall protection tape that does not require a hook to be directly attached when the hook F is attached to a wall surface. It may be a general office adhesive tape that is used.

基材２は、紙や樹脂フィルムなどの任意の素材からなるシート体からなってよいが、基材２は、粘着剤層３に含まれる水膨潤性粘着剤に水を含ませやすくするため透水性を備えた素材から構成されている。
Permeability for the substrate 2 may be made from a sheet body made of any material such as paper or a resin film, but the base material 2, to facilitate moistened with water in the water-swellable adhesive contained in the adhesive layer 3 It is composed of material with the characteristics.

粘着剤層３は、水によって膨潤する水膨潤性粘着剤が配合された粘着剤を、基材２の一方の面に所定の厚みとなるように一様に塗布して形成されている。水膨潤性粘着剤の一例としては、水溶性ポリマーを主成分とし、そこに水溶性可塑剤（例えば、三洋化成工業社製サンニックスＳＰ７５０など）と架橋剤（例えば、ナガセケムテックス社製デナコールＢ−８３０など）を所定量配合したものからなる。   The pressure-sensitive adhesive layer 3 is formed by uniformly applying a pressure-sensitive adhesive containing a water-swellable pressure-sensitive adhesive that swells with water so as to have a predetermined thickness on one surface of the substrate 2. As an example of the water-swellable pressure-sensitive adhesive, a water-soluble polymer as a main component, a water-soluble plasticizer (for example, Sanix SP750 manufactured by Sanyo Chemical Industries, Ltd.) and a crosslinking agent (for example, Denacol B manufactured by Nagase ChemteX Corporation) -830) and the like in a predetermined amount.

水膨潤性粘着剤の細かな組成は、仕様に応じて任意に変更可能であるが、水を含ませることにより、少なくとも２０００重量％以上膨潤するように設定しておくことが好ましい。この例において、粘着剤層３は、１７０００重量％の膨潤性をもった粘着剤を目付量５０ｇ／ｍ２で厚さ５０μｍとなるように形成されている。 The fine composition of the water-swellable pressure-sensitive adhesive can be arbitrarily changed according to the specifications, but it is preferable to set it to swell at least 2000% by weight by including water. In this example, the pressure-sensitive adhesive layer 3 is formed so that a pressure-sensitive adhesive having a swelling property of 17000% by weight has a weight per unit area of 50 g / m 2 and a thickness of 50 μm.

この例において、基材２は、目付量４５ｇ／ｍ２で厚さ２３０μｍの易透水性のパルプ製不織布からなり、水を含ませることによって、粘着剤層３に水を供給して速やかに粘着剤層３に含まれる水膨潤性粘着剤を膨潤させることができるようになっている。 In this example, the substrate 2 is made of an easily permeable pulp nonwoven fabric having a weight per unit area of 45 g / m 2 and a thickness of 230 μm. The water-swellable pressure-sensitive adhesive contained in the agent layer 3 can be swollen.

なお、基材２を不織布で構成した場合、基材が弱いために基材２が簡単に破壊されてしまう。そこで、基材２の強度を上げるため、図５に示すように、基材２の周縁をヒートシール２２によってあらかじめ固着しておき、強度を高めるようにしてもよい。   In addition, when the base material 2 is comprised with a nonwoven fabric, since the base material is weak, the base material 2 will be destroyed easily. Therefore, in order to increase the strength of the base material 2, as shown in FIG. 5, the periphery of the base material 2 may be fixed in advance with a heat seal 22 to increase the strength.

この例において、基材２は水を含みやすいパルプ不織布からなるが、基材２を透水性のない樹脂フィルムで構成することもできる。そのような場合においては、図２（ａ）および（ｂ）に示すように、基材２に透水孔２１を多数設けて透水性を確保する。このような態様も本発明に含まれる。   In this example, although the base material 2 consists of a pulp nonwoven fabric which is easy to contain water, the base material 2 can also be comprised with the resin film which does not have water permeability. In such a case, as shown in FIGS. 2 (a) and 2 (b), a large number of water permeable holes 21 are provided in the substrate 2 to ensure water permeability. Such an embodiment is also included in the present invention.

これによれば、樹脂シートなどからなる基材２を用いたとしても、基材２の表面（反粘着面）に霧吹きなどによって水を吹き付けることにより、透水孔２１を介して粘着剤層２に直接水を送り込むことができ、速やかに水膨潤性粘着剤を膨潤させることができる。   According to this, even if the base material 2 made of a resin sheet or the like is used, the surface of the base material 2 (anti-adhesive surface) is sprayed on the pressure-sensitive adhesive layer 2 via the water permeable holes 21 by spraying water by spraying or the like. Water can be fed directly, and the water-swellable pressure-sensitive adhesive can be rapidly swelled.

さらに別の手段としては、図３（ａ），（ｂ）に示すように、粘着テープ１の粘着剤層３を筋状に形成し、この筋状粘着剤層３の間に水を通すための導水路３１を設けてもよい。   As another means, as shown in FIGS. 3A and 3B, the pressure-sensitive adhesive layer 3 of the pressure-sensitive adhesive tape 1 is formed in a streak shape, and water is passed between the streaky pressure-sensitive adhesive layer 3. The water conduit 31 may be provided.

この例において、粘着剤層３は基材２の上下方向に沿って所定間隔を持って平行に筋状に形成され、その間に導水路３１が形成されているが、基材２に対して左右方向に筋状に形成されてもよい。また、筋状以外に縞状や波目状などであってもよく、粘着剤層３の間に直接水を導き入れる導水路３１が形成できれば、これら変形例も本発明に含まれる。   In this example, the pressure-sensitive adhesive layer 3 is formed in parallel streaks with a predetermined interval along the vertical direction of the base material 2, and a water conduit 31 is formed between them. It may be formed in a streak shape in the direction. Further, in addition to the streak shape, the shape may be a stripe shape, a wave shape, or the like, and these modified examples are also included in the present invention as long as the water conduit 31 for introducing water directly between the adhesive layers 3 can be formed.

より好ましい態様として、基材２は、層間破壊強度（基材２の厚さ方向の強度）が粘着剤の粘着強度よりも弱められていることが好ましい。これによれば、図４（ａ）に示すように、粘着テープ１を引き剥がしてゆくと、粘着剤層３が被粘着面から剥がれる前に基材２が破壊されて被接触面側に残る。破壊された基材２の上から水をかけることによって、粘着剤層３を素早く膨潤させることができる。   As a more preferred embodiment, the base material 2 preferably has an interlaminar fracture strength (strength in the thickness direction of the base material 2) weaker than the adhesive strength of the pressure-sensitive adhesive. According to this, as shown in FIG. 4A, when the adhesive tape 1 is peeled off, the base material 2 is destroyed and remains on the contacted surface side before the adhesive layer 3 is peeled off from the adherend surface. . By applying water from above the destroyed substrate 2, the pressure-sensitive adhesive layer 3 can be quickly swollen.

また、図４（ｂ）に示すように、あえて粘着剤層３の凝集力を弱めておき、剥離する際に粘着剤層３を破壊させるようにしてもよい。すなわち、被粘着面Ｗに粘着剤層３の一部が残る（糊残りする）ことにより、残った粘着剤に直接水を吹き付けて膨潤させて除去するようにしてもよい。   Moreover, as shown in FIG.4 (b), the cohesive force of the adhesive layer 3 may be dared weakly, and you may make it destroy the adhesive layer 3 at the time of peeling. That is, when a part of the pressure-sensitive adhesive layer 3 remains on the adherend surface W (glue remains), the remaining pressure-sensitive adhesive may be directly swollen to be swollen and removed.

さらに別の手段としては、基材２を連続気泡発泡させておき、水をかけることで、その連続気泡内に水を蓄えさせるようにしてもよい。連続発泡の方法としては、マイクロバブルなどを配合しておき、加熱するなどして、基材２を発泡させるなどすればよい。さらには、基材２とともに粘着剤３も連続発泡させてもよい。   As yet another means, the base material 2 may be foamed with open cells, and water may be applied to store water in the open cells. As a continuous foaming method, microbubbles or the like may be blended and heated to foam the substrate 2. Furthermore, the adhesive 3 may be continuously foamed together with the substrate 2.

より好ましい態様としては、基材２自体に水を吸い込むことで膨潤する素材が用いられていることが好ましい。基材２自体に水膨潤性を備える素材としては，例えば高吸収樹脂を用いた連続気泡発泡体シートなどが挙げられる。これは、吸水による膨潤でシート自体が膨らみ、被着面との接触面積を減少する働きが生じる。   As a more preferable aspect, it is preferable to use a material that swells by sucking water into the substrate 2 itself. Examples of the material having water swellability in the substrate 2 itself include an open-cell foam sheet using a highly absorbent resin. This causes the sheet itself to swell due to swelling due to water absorption, thereby reducing the contact area with the adherend surface.

これによれば、シート自体が水膨潤のような機能を有することによって、より粘着剤への水の供給を速やかに行うことができるばかりでなく、余った水を基材２で吸い取ることにより、被粘着面に水が染み込むことをできるだけ防止することができる。   According to this, since the sheet itself has a function such as water swelling, not only can the water supply to the pressure-sensitive adhesive be performed more quickly, but also by absorbing excess water with the substrate 2, It is possible to prevent water from penetrating the adherend surface as much as possible.

上述した第１実施形態において、粘着テープ１は、基材２の片面にのみ粘着剤層３が形成された片面粘着テープであるが、本発明の粘着テープ構造は、基材２の両面に粘着剤層が形成された、いわゆる両面粘着テープに適用されてもよい。   In 1st Embodiment mentioned above, although the adhesive tape 1 is a single-sided adhesive tape in which the adhesive layer 3 was formed only in the single side | surface of the base material 2, the adhesive tape structure of this invention adheres to both surfaces of the base material 2. FIG. You may apply to what is called a double-sided adhesive tape in which the agent layer was formed.

すなわち、図６に示すように、この粘着テープ１ａは、基材２の一方の面（図６では左側面）に形成された第１粘着剤層３と、基材２の他方の面（図６では右側面）に形成された第２粘着剤層４とを有する両面粘着式の粘着テープである。   That is, as shown in FIG. 6, this adhesive tape 1a includes a first pressure-sensitive adhesive layer 3 formed on one surface of the substrate 2 (left side surface in FIG. 6) and the other surface of the substrate 2 (FIG. 6). 6 is a double-sided pressure-sensitive adhesive tape having a second pressure-sensitive adhesive layer 4 formed on the right side surface.

基材２は、上述した第１実施形態と同じ目付量４５ｇ／ｍ２で厚さ２３０μｍのパルプ製不織布からなり、水を含ませることによって、粘着剤層３に水を供給して速やかに粘着剤層３に含まれる水膨潤性粘着剤を膨潤させることができるようになっている。 The base material 2 is made of a non-woven fabric made of pulp having the same basis weight of 45 g / m 2 as in the first embodiment and having a thickness of 230 μm. By containing water, the base material 2 supplies water to the pressure-sensitive adhesive layer 3 and quickly adheres. The water-swellable pressure-sensitive adhesive contained in the agent layer 3 can be swollen.

第１粘着剤層３は、上記第１実施形態と同じ水膨潤性粘着剤が配合された粘着剤を用い、同粘着剤を基材２の一方の面に沿って目付量５０ｇ／ｍ２で厚さ５０μｍとなるように一様に塗布されている。 The first pressure-sensitive adhesive layer 3 uses a pressure-sensitive adhesive in which the same water-swellable pressure-sensitive adhesive as that in the first embodiment is blended, and the weight of the pressure-sensitive adhesive along one surface of the substrate 2 is 50 g / m 2 . It is uniformly applied to a thickness of 50 μm.

第２粘着剤層４は、通常の粘着テープに用いられる粘着剤が用いられており、この例では再剥離可能な弱粘着ウレタン粘着剤が用いられている。第２粘着剤層４は、目付量５０ｇ／ｍ２で厚さ５０μｍとなるように基材２の他方の面に沿って一様に塗布されている。 For the second pressure-sensitive adhesive layer 4, a pressure-sensitive adhesive used for a normal pressure-sensitive adhesive tape is used, and in this example, a weakly adhesive urethane pressure-sensitive adhesive that can be removed again is used. The 2nd adhesive layer 4 is uniformly apply | coated along the other surface of the base material 2 so that it may become 50 micrometers in thickness with the basis weight of 50 g / m < 2 >.

この第２実施形態において、基材２は不織布からなるが、第１実施形態と同様に水を通さない樹脂フィルムであってもよい。その場合、図７に示すように、基材２と、第２粘着剤層４にそれぞれ連通する透水孔２１を設けることが好ましい。   In this 2nd Embodiment, although the base material 2 consists of nonwoven fabrics, the resin film which does not let water pass similarly to 1st Embodiment may be sufficient. In that case, as shown in FIG. 7, it is preferable to provide water permeable holes 21 communicating with the base material 2 and the second pressure-sensitive adhesive layer 4, respectively.

また、この実施形態において、他方の第２粘着剤層４は、水膨潤性粘着剤を含まない通常の粘着剤が用いられているが、第２粘着剤４にも水膨潤性粘着剤が含まれていてもよい。これによれば、図８に示すように、両面に水膨潤性粘着剤が含まれているため、基材２をあえて破壊させながら粘着テープ１ａを分離したのち、その各々の基材２に水を吹き付けることで、第１粘着剤層３と第２粘着剤層４に水を含ませて、簡単に粘着テープを除去することができる。   In this embodiment, the other second pressure-sensitive adhesive layer 4 uses a normal pressure-sensitive adhesive that does not contain a water-swellable pressure-sensitive adhesive, but the second pressure-sensitive adhesive 4 also contains a water-swellable pressure-sensitive adhesive. It may be. According to this, as shown in FIG. 8, since the water-swellable pressure-sensitive adhesive is contained on both sides, the adhesive tape 1a is separated while intentionally destroying the base material 2, and then each base material 2 is subjected to water. By spraying, water can be included in the first pressure-sensitive adhesive layer 3 and the second pressure-sensitive adhesive layer 4 to easily remove the pressure-sensitive adhesive tape.

なお、上述した実施形態では、基材２が厚さ方向に分離して破壊されることについて例示したが、実際には基材２は厚さ方向だけでなく、縦方向に裂けたり、破けたりもすることが考えられるが、どのような位置から破壊が進行しても、水を速やかに吸収させることができる。   In addition, in embodiment mentioned above, although illustrated about the base material 2 isolate | separating to a thickness direction and destroying, in fact, the base material 2 is not only a thickness direction, but it is torn or torn in the vertical direction. Although it is conceivable, water can be absorbed promptly regardless of where the destruction proceeds.

なお、この第２実施形態の両面粘着テープ１ａに、上述した図３（ａ）および（ｂ）に記載された導水路３１を設けてもよく、このような態様も本発明に含まれる。また、粘着剤層３，４を連続発泡させて水を含ませやすくしてもよい。
In addition, you may provide the water conduit 31 described in FIG. 3 (a) and (b) mentioned above in the double-sided adhesive tape 1a of this 2nd Embodiment, and such an aspect is also contained in this invention. Alternatively, the pressure-sensitive adhesive layers 3 and 4 may be continuously foamed to easily contain water.

本発明の第１実施形態に係る粘着テープロールの要部断面図。The principal part sectional drawing of the adhesive tape roll which concerns on 1st Embodiment of this invention. 第１実施形態の変形例を表す（ａ）背面図および（ｂ）Ａ−Ａ線断面図。The (a) rear view and (b) AA sectional view showing the modification of 1st Embodiment. さらに別の変形例を表す（ａ）背面図および（ｂ）Ｂ−Ｂ線断面図。Furthermore, (a) a rear view and (b) BB sectional drawing showing another modification. （ａ），（ｂ）は、基材の変形例を表す要部断面図である。(A), (b) is principal part sectional drawing showing the modification of a base material. 基材の変形例を表す正面図。The front view showing the modification of a base material. 本発明の第２実施形態に係る粘着テープの使用状態を表す要部断面図。The principal part sectional drawing showing the use condition of the adhesive tape which concerns on 2nd Embodiment of this invention. 第２実施形態の変形例を表す要部断面図。The principal part sectional drawing showing the modification of 2nd Embodiment. 第２実施形態の粘着テープの剥離手順の一例を表す模式図。The schematic diagram showing an example of the peeling procedure of the adhesive tape of 2nd Embodiment.

符号の説明Explanation of symbols

１，１ａ 粘着テープ
２ 基材
３ 第１粘着剤層
４ 第２粘着剤層 1, 1a Adhesive tape 2 Base material 3 First adhesive layer 4 Second adhesive layer

Claims (7)

シート状の基材の一方の面に水を含むと膨潤して粘着力が低下する水膨潤性粘着剤を含む水膨潤性粘着剤層が形成された粘着テープにおいて、
上記基材には、透水性を備える素材が用いられているとともに、
上記基材の層間破壊強度が上記粘着剤の粘着強度より弱められており、
上記基材が上記水膨潤性粘着剤層が被貼着面から剥がされる前に破壊されて上記破壊された基材の一部が上記水膨潤性粘着剤層とともに被貼着面側に残ることにより、上記水膨潤性粘着剤層に水を供給して上記貼着面から剥がす際に、上記基材の側から上記水膨潤性粘着剤層へ水を供給し得るしたことを特徴とする粘着テープ。 In a pressure-sensitive adhesive tape formed with a water-swellable pressure-sensitive adhesive layer containing a water-swellable pressure-sensitive adhesive that swells and decreases its adhesive strength when water is contained on one surface of a sheet-like base material,
The base material is made of a material having water permeability ,
The interlaminar fracture strength of the substrate is weaker than the adhesive strength of the adhesive,
The base material is destroyed before the water-swellable pressure-sensitive adhesive layer is peeled off from the sticking surface, and a part of the destroyed base material remains on the sticking surface side together with the water-swellable pressure-sensitive adhesive layer. Thus, when water is supplied to the water-swellable pressure-sensitive adhesive layer and peeled off from the sticking surface, water can be supplied from the substrate side to the water-swellable pressure-sensitive adhesive layer. tape. 上記水膨潤性粘着剤層は筋状に形成されており、上記筋状の水膨潤性粘着剤層の間に水を導くための導水路が設けられていることを特徴とする請求項１に記載の粘着テープ。 Upper Symbol water-swellable adhesive layer is formed in a stripe-like, according to claim 1, characterized in that the water conduit for guiding water is provided between the streak water-swellable adhesive layer The adhesive tape as described in . 上記水膨潤性粘着剤層および／または上記基材には、透水孔が形成されていることを特徴とする請求項１に記載の粘着テープ。 The upper SL water-swellable adhesive layer and / or the base, pressure-sensitive adhesive tape according to claim 1, characterized in that the permeability hole is formed. 上記基材は、連続気泡で発泡されていることを特徴とする請求項１に記載の粘着テープ。 Above Kimotozai the pressure-sensitive adhesive tape according to claim 1, characterized in that it is foamed open cell. 上記基材自体が水を含むと膨潤する素材からなることを特徴とする請求項１ないし４のいずれか１項に記載の粘着テープ。   The pressure-sensitive adhesive tape according to any one of claims 1 to 4, wherein the substrate itself is made of a material that swells when it contains water. 上記基材の他方の面にも、粘着剤層が設けられていることを特徴とする請求項１ないし５のいずれか１項に記載の粘着テープ。 The pressure-sensitive adhesive tape according to any one of claims 1 to 5 , wherein a pressure-sensitive adhesive layer is also provided on the other surface of the substrate. 上記他方の面に形成された粘着剤層にも、上記水膨潤性粘着剤が配合されていることを特徴とする請求項６に記載の粘着テープ。 Above also other pressure-sensitive adhesive layer formed on the surface of the adhesive tape according to claim 6, characterized in that the water swellable pressure sensitive adhesive is blended.
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KR20110083631A (en) 2011-07-20

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