JP6470684B2 - Double-sided adhesive tape - Google Patents

Double-sided adhesive tape Download PDF

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JP6470684B2
JP6470684B2 JP2015516370A JP2015516370A JP6470684B2 JP 6470684 B2 JP6470684 B2 JP 6470684B2 JP 2015516370 A JP2015516370 A JP 2015516370A JP 2015516370 A JP2015516370 A JP 2015516370A JP 6470684 B2 JP6470684 B2 JP 6470684B2
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pressure
sensitive adhesive
weight
meth
acrylic
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JPWO2015151954A1 (en
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徳之 内田
徳之 内田
勇樹 岩井
勇樹 岩井
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Sekisui Chemical Co Ltd
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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • 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
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C09J133/04—Homopolymers or copolymers of esters
    • C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09J133/08—Homopolymers or copolymers of acrylic acid esters
    • 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]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/385—Acrylic polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/025—Polyolefin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2405/00—Adhesive articles, e.g. adhesive tapes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/04—Acids; Metal salts or ammonium salts thereof
    • C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1802—C2-(meth)acrylate, e.g. ethyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1804—C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1808—C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/20—Esters of polyhydric alcohols or phenols, e.g. 2-hydroxyethyl (meth)acrylate or glycerol mono-(meth)acrylate
    • 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
    • C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
    • C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • 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
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • 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
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    • 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
    • C09J2400/00—Presence of inorganic and organic materials
    • C09J2400/20—Presence of organic materials
    • C09J2400/24—Presence of a foam
    • C09J2400/243—Presence of a foam in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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    • C09J2423/00—Presence of polyolefin
    • C09J2423/006—Presence of polyolefin in the substrate

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Laminated Bodies (AREA)

Description

本発明は、ポリオレフィン系樹脂により形成された発泡基材の両面に、粘着剤層が積層されている両面粘着テープに関する。  The present invention relates to a double-sided pressure-sensitive adhesive tape in which pressure-sensitive adhesive layers are laminated on both surfaces of a foamed substrate formed of a polyolefin-based resin.

携帯電話、及び携帯情報端末（Ｐｅｒｓｏｎａｌ Ｄｉｇｉｔａｌ Ａｓｓｉｓｔａｎｔｓ、ＰＤＡ）等の携帯電子機器は、例えば、使用者により意図せずに落下されることがある。落下による衝撃が付与されても、携帯電子機器の表示不良が生じないように、携帯電子機器には衝撃吸収性が求められている。  Mobile electronic devices such as mobile phones and personal digital assistants (PDAs) may be dropped unintentionally by a user, for example. Even if an impact due to dropping is applied, the mobile electronic device is required to have a shock absorbing property so that a display defect of the mobile electronic device does not occur.

衝撃吸収性が高められた両面粘着テープが下記の特許文献１，２に開示されている。特許文献１，２に記載の両面粘着テープでは、基材層の少なくとも片面に（メタ）アクリル系粘着剤層が積層一体化されている。上記基材層は、特定の架橋度及び気泡のアスペクト比を有する架橋ポリオレフィン系樹脂発泡基材である。  Double-sided pressure-sensitive adhesive tapes with improved shock absorption are disclosed in Patent Documents 1 and 2 below. In the double-sided pressure-sensitive adhesive tapes described in Patent Documents 1 and 2, a (meth) acrylic pressure-sensitive adhesive layer is laminated and integrated on at least one surface of the base material layer. The base material layer is a cross-linked polyolefin resin foam base material having a specific degree of cross-linking and an aspect ratio of bubbles.

また、携帯電子機器は、意図せずに水中に落下されることがある。さらに、携帯電子機器には、雨などの水滴が付着することもある。携帯電子機器に水分が多く付着すると、携帯電子機器の内部に水分が侵入して、表示不良が生じることがある。このような水分に起因する表示不良が生じないように、携帯電子機器には、高い防水性が求められている。  Moreover, a portable electronic device may fall into water unintentionally. In addition, water droplets such as rain may adhere to the portable electronic device. If a large amount of moisture adheres to the portable electronic device, moisture may enter the portable electronic device and display defects may occur. In order to prevent such display defects due to moisture, high waterproofness is required for portable electronic devices.

また、携帯電子機器では、例えば、装置表面を構成するガラス板と画像表示部材との間に、これらを接着するために両面粘着テープが用いられている。この両面粘着テープにも、高い衝撃吸収性と高い防水性とが求められている。  In portable electronic devices, for example, a double-sided adhesive tape is used between a glass plate constituting an apparatus surface and an image display member in order to bond them. This double-sided pressure-sensitive adhesive tape is also required to have high shock absorption and high waterproofness.

また更に、携帯電子機器の薄型化が進行している。薄型化に伴って、ポリカーボネートなどの表示パネル部品が温度変化によって反りやすくなっている。携帯電子機器が過酷な温度環境に晒されても、両面粘着テープが部品から剥離しないことも望まれている。  Furthermore, the thickness of portable electronic devices has been reduced. As the thickness is reduced, display panel parts such as polycarbonate are likely to warp due to temperature changes. It is also desired that the double-sided pressure-sensitive adhesive tape does not peel from the component even when the portable electronic device is exposed to a severe temperature environment.

特開２００９−２４２５４１号公報JP 2009-242541 A 特開２００９−２５８２７４号公報JP 2009-258274 A

特許文献１，２に記載の両面粘着テープでは、衝撃吸収性にある程度優れている。しかし、特許文献１，２に記載のような従来の両面粘着テープにおいて、高い接着性と高い防水性との双方をより一層高いレベルで両立することが求められている。両面粘着テープにより接着された部品に反りが生じても、剥離が生じ難いことが求められている。また、両面粘着テープにより接着された電子機器等に水分が付着しても、両面粘着テープの接着界面から水分の浸入を抑えることが求められている。  The double-sided pressure-sensitive adhesive tapes described in Patent Documents 1 and 2 are excellent in shock absorption to some extent. However, the conventional double-sided pressure-sensitive adhesive tapes as described in Patent Documents 1 and 2 are required to achieve both high adhesiveness and high waterproofness at an even higher level. Even if the parts bonded by the double-sided pressure-sensitive adhesive tape are warped, it is required that peeling does not easily occur. In addition, even if moisture adheres to an electronic device or the like bonded with a double-sided pressure-sensitive adhesive tape, it is required to suppress the entry of moisture from the adhesive interface of the double-sided pressure-sensitive adhesive tape.

本発明の目的は、高い接着性と高い防水性との双方を高いレベルで両立することができる両面粘着テープを提供することである。  An object of the present invention is to provide a double-sided pressure-sensitive adhesive tape that can achieve both high adhesion and high waterproofness at a high level.

本発明の広い局面によれば、ポリオレフィン系樹脂により形成されている発泡基材と、前記発泡基材の第１の表面側に配置されており、かつ、（メタ）アクリル系粘着剤により形成されている第１の粘着剤層と、上記発泡基材の上記第１の表面側とは反対の第２の表面側に配置されており、かつ、（メタ）アクリル系粘着剤により形成されている第２の粘着剤層とを備え、長さ６１ｍｍ及び幅４９ｍｍの矩形の外形を有し、長さ５７ｍｍ及び幅４５ｍｍの矩形の内形を有し、かつ２ｍｍの幅を有する枠状の両面粘着テープを用意し、長さ１００ｍｍ、幅１００ｍｍ及び厚み１０ｍｍの矩形を有し、かつ貫通孔を有する第１のアクリル板を用意し、長さ１００ｍｍ、幅１００ｍｍ及び厚み１０ｍｍの矩形を有し、かつ貫通孔を有さない第２のアクリル板を用意して、上記第１のアクリル板と上記第２のアクリル板とを上記枠状の両面粘着テープを介して貼り合わせて、上記第１のアクリル板と上記第２のアクリル板と上記枠状の両面粘着テープとで囲まれた内部空間を有する積層体を得て、上記積層体における上記第１のアクリル板の貫通孔から上記積層体の上記内部空間に空気を入れ、上記内部空間の内圧を３０ｋＰａにする加圧試験を行ったときに、上記枠状の両面粘着テープと上記第１のアクリル板及び上記第２のアクリル板との少なくとも一方の界面で剥離が生じることによって、上記積層体の上記内部空間の内圧が減少し始めるまでの時間が５０分以上である、両面粘着テープが提供される。  According to a wide aspect of the present invention, the foamed base material is formed of a polyolefin-based resin, and is disposed on the first surface side of the foamed base material, and is formed of a (meth) acrylic pressure-sensitive adhesive. The first pressure-sensitive adhesive layer is disposed on the second surface side opposite to the first surface side of the foamed base material, and is formed of a (meth) acrylic pressure-sensitive adhesive. A frame-like double-sided adhesive having a rectangular outer shape having a length of 61 mm and a width of 49 mm, a rectangular inner shape having a length of 57 mm and a width of 45 mm, and a width of 2 mm. A tape is prepared, a first acrylic plate having a length of 100 mm, a width of 100 mm and a thickness of 10 mm, and having a through hole is prepared, and has a length of 100 mm, a width of 100 mm and a thickness of 10 mm, and Second a with no through hole A rill plate is prepared, and the first acrylic plate and the second acrylic plate are bonded to each other via the frame-shaped double-sided adhesive tape, and the first acrylic plate and the second acrylic plate are A laminate having an internal space surrounded by the frame-shaped double-sided adhesive tape is obtained, and air is introduced into the internal space of the laminate from the through hole of the first acrylic plate in the laminate. When a pressure test is performed to set the internal pressure of the space to 30 kPa, peeling occurs at at least one interface between the frame-shaped double-sided pressure-sensitive adhesive tape, the first acrylic plate, and the second acrylic plate. A double-sided pressure-sensitive adhesive tape is provided in which the time until the internal pressure of the internal space of the laminate starts to decrease is 50 minutes or more.

本発明に係る両面粘着テープのある特定の局面では、上記第１の粘着剤層に含まれる上記（メタ）アクリル系粘着剤が、（メタ）アクリル重合体と粘着付与樹脂を含み、上記第１の粘着剤層において、上記（メタ）アクリル重合体１００重量部に対する上記粘着付与樹脂の含有量が３６重量部以上、５０重量部以下であり、上記第２の粘着剤層に含まれる上記（メタ）アクリル系粘着剤が、（メタ）アクリル重合体と粘着付与樹脂を含み、上記第２の粘着剤層において、上記（メタ）アクリル重合体１００重量部に対する上記粘着付与樹脂の含有量が３６重量部以上、５０重量部以下である。  In a specific aspect of the double-sided pressure-sensitive adhesive tape according to the present invention, the (meth) acrylic pressure-sensitive adhesive contained in the first pressure-sensitive adhesive layer contains a (meth) acrylic polymer and a tackifier resin, and the first In the pressure-sensitive adhesive layer, the content of the tackifying resin with respect to 100 parts by weight of the (meth) acrylic polymer is 36 parts by weight or more and 50 parts by weight or less, and the (meta) contained in the second pressure-sensitive adhesive layer. ) The acrylic pressure-sensitive adhesive contains a (meth) acrylic polymer and a tackifying resin. In the second pressure-sensitive adhesive layer, the content of the tackifying resin with respect to 100 parts by weight of the (meth) acrylic polymer is 36% by weight. Part to 50 parts by weight.

本発明に係る両面粘着テープのある特定の局面では、上記第１の粘着剤層に含まれる上記（メタ）アクリル系粘着剤が、重量平均分子量の数平均分子量に対する比が１０以上、１５以下である（メタ）アクリル重合体を含み、上記第２の粘着剤層に含まれる上記（メタ）アクリル系粘着剤が、重量平均分子量の数平均分子量に対する比が１０以上、１５以下である（メタ）アクリル重合体を含む。  In a specific aspect of the double-sided pressure-sensitive adhesive tape according to the present invention, the (meth) acrylic pressure-sensitive adhesive contained in the first pressure-sensitive adhesive layer has a ratio of the weight average molecular weight to the number average molecular weight of 10 or more and 15 or less. The (meth) acrylic pressure-sensitive adhesive containing a (meth) acrylic polymer and contained in the second pressure-sensitive adhesive layer has a ratio of the weight average molecular weight to the number average molecular weight of 10 or more and 15 or less (meth). Contains acrylic polymer.

本発明に係る両面粘着テープのある特定の局面では、上記第１の粘着剤層に含まれる上記（メタ）アクリル系粘着剤が、（メタ）アクリル重合体と粘着付与樹脂を含み、上記第１の粘着剤層において、上記（メタ）アクリル重合体１００重量部に対する上記粘着付与樹脂の含有量が４０重量部以上、５０重量部以下であり、上記第２の粘着剤層に含まれる上記（メタ）アクリル系粘着剤が、（メタ）アクリル重合体と粘着付与樹脂を含み、上記第２の粘着剤層において、上記（メタ）アクリル重合体１００重量部に対する上記粘着付与樹脂の含有量が４０重量部以上、５０重量部以下である。  In a specific aspect of the double-sided pressure-sensitive adhesive tape according to the present invention, the (meth) acrylic pressure-sensitive adhesive contained in the first pressure-sensitive adhesive layer contains a (meth) acrylic polymer and a tackifier resin, and the first In the pressure-sensitive adhesive layer, the content of the tackifying resin with respect to 100 parts by weight of the (meth) acrylic polymer is 40 parts by weight or more and 50 parts by weight or less, and the (meta) contained in the second pressure-sensitive adhesive layer. ) The acrylic pressure-sensitive adhesive contains a (meth) acrylic polymer and a tackifying resin, and in the second pressure-sensitive adhesive layer, the content of the tackifying resin with respect to 100 parts by weight of the (meth) acrylic polymer is 40%. Part to 50 parts by weight.

本発明に係る両面粘着テープのある特定の局面では、上記第１の粘着剤層のゲル分率が１５重量％以上、５０重量％以下であり、上記第２の粘着剤層のゲル分率が１５重量％以上、５０重量％以下である。  On the specific situation with the double-sided adhesive tape which concerns on this invention, the gel fraction of the said 1st adhesive layer is 15 weight% or more and 50 weight% or less, The gel fraction of the said 2nd adhesive layer is It is 15 weight% or more and 50 weight% or less.

本発明に係る両面粘着テープのある特定の局面では、上記発泡基材が、上記ポリオレフィン系樹脂を架橋及び発泡させることにより得られる。  On the specific situation with the double-sided adhesive tape which concerns on this invention, the said foaming base material is obtained by bridge | crosslinking and foaming the said polyolefin resin.

本発明に係る両面粘着テープのある特定の局面では、上記第１の粘着剤層の厚みが２５μｍ以上、１００μｍ以下であり、上記第２の粘着剤層の厚みが２５μｍ以上、１００μｍ以下である。  On the specific situation with the double-sided adhesive tape which concerns on this invention, the thickness of the said 1st adhesive layer is 25 micrometers or more and 100 micrometers or less, and the thickness of the said 2nd adhesive layer is 25 micrometers or more and 100 micrometers or less.

本発明に係る両面粘着テープは、ポリオレフィン系樹脂により形成されている発泡基材と、上記発泡基材の第１の表面側に配置されており、かつ、（メタ）アクリル系粘着剤により形成されている第１の粘着剤層と、上記発泡基材の上記第１の表面側とは反対の第２の表面側に配置されており、かつ、（メタ）アクリル系粘着剤により形成されている第２の粘着剤層とを備えており、長さ６１ｍｍ及び幅４９ｍｍの矩形の外形を有し、長さ５７ｍｍ及び幅４５ｍｍの矩形の内形を有し、かつ２ｍｍの幅を有する枠状の両面粘着テープを介して、第１，第２のアクリル板を貼り合わせた積層体を用いて加圧試験を行ったときに、上記枠状の両面粘着テープと上記第１，第２のアクリル板との少なくとも一方の界面で剥離が生じることによって、上記積層体の上記内部空間の内圧が減少し始めるまでの時間が５０分以上であるので、高い接着性と高い防水性との双方を高いレベルで両立することができる。  The double-sided pressure-sensitive adhesive tape according to the present invention is disposed on the first surface side of the foamed base material formed of a polyolefin resin and the foamed base material, and is formed of a (meth) acrylic pressure-sensitive adhesive. The first pressure-sensitive adhesive layer is disposed on the second surface side opposite to the first surface side of the foamed base material, and is formed of a (meth) acrylic pressure-sensitive adhesive. A second adhesive layer, having a rectangular outer shape with a length of 61 mm and a width of 49 mm, a rectangular inner shape with a length of 57 mm and a width of 45 mm, and a frame shape having a width of 2 mm When a pressure test is performed using a laminate in which the first and second acrylic plates are bonded together via a double-sided adhesive tape, the frame-shaped double-sided adhesive tape and the first and second acrylic plates When peeling occurs at at least one interface with Since the time until the internal pressure of the internal space of the serial laminate begins to decrease is not less than 50 minutes, it is possible to achieve both both high adhesion and high waterproofness at a high level.

図１（ａ）及び（ｂ）は、加圧試験の方法を説明するための模式的な正面断面図及び平面断面図である。FIGS. 1A and 1B are a schematic front sectional view and a plan sectional view for explaining a method of a pressure test. 図２は、耐反発性試験の方法を説明するための模式的な斜視図である。FIG. 2 is a schematic perspective view for explaining a method of the repulsion resistance test.

以下、本発明を詳細に説明する。  Hereinafter, the present invention will be described in detail.

（両面粘着テープ）
本発明に係る両面粘着テープは、発泡基材と、第１の粘着剤層と、第２の粘着剤層とを備える。上記第１の粘着剤層は、上記発泡基材の第１の表面側に配置されている。上記第２の粘着剤層は、上記発泡基材の上記第１の表面側とは反対の第２の表面側に配置されている。上記発泡基材は、上記第１の粘着剤層と上記第２の粘着剤層との間に配置されている。上記発泡基材は、発泡体であり、基材層である。上記発泡基材は、ポリオレフィン系樹脂により形成されている。上記第１の粘着剤層は、（メタ）アクリル系粘着剤により形成されている。上記第２の粘着剤層は、（メタ）アクリル系粘着剤により形成されている。(Double-sided adhesive tape)
The double-sided pressure-sensitive adhesive tape according to the present invention includes a foamed base material, a first pressure-sensitive adhesive layer, and a second pressure-sensitive adhesive layer. The said 1st adhesive layer is arrange | positioned at the 1st surface side of the said foaming base material. The said 2nd adhesive layer is arrange | positioned at the 2nd surface side opposite to the said 1st surface side of the said foaming base material. The said foaming base material is arrange | positioned between the said 1st adhesive layer and the said 2nd adhesive layer. The said foaming base material is a foam and is a base material layer. The foam base is formed of a polyolefin resin. The first pressure-sensitive adhesive layer is formed of a (meth) acrylic pressure-sensitive adhesive. The second pressure-sensitive adhesive layer is formed of a (meth) acrylic pressure-sensitive adhesive.

本発明に係る両面粘着テープでは、以下の所定の加圧試験を行った時に、かなり良好な性質を示す。  The double-sided pressure-sensitive adhesive tape according to the present invention exhibits considerably good properties when the following predetermined pressure test is performed.

［加圧試験の詳細］
図１を参照しつつ、加圧試験の詳細を説明する。図１（ａ）は、加圧試験時の状態を模式的に示す正面断面図である。図１（ｂ）は、図１（ａ）のＩ−Ｉ線に沿う平面断面図である。[Details of pressure test]
Details of the pressure test will be described with reference to FIG. Fig.1 (a) is front sectional drawing which shows the state at the time of a pressurization test typically. FIG. 1B is a cross-sectional plan view taken along the line II of FIG.

本発明に係る両面粘着テープを用いて、長さ６１ｍｍ及び幅４９ｍｍの矩形の外形を有し、長さ５７ｍｍ及び幅４５ｍｍの矩形の内形を有し、かつ２ｍｍの幅を有する枠状の両面粘着テープ１を用意する。  Using the double-sided pressure-sensitive adhesive tape according to the present invention, a frame-shaped double-sided surface having a rectangular outer shape with a length of 61 mm and a width of 49 mm, a rectangular inner shape with a length of 57 mm and a width of 45 mm, and a width of 2 mm An adhesive tape 1 is prepared.

本発明に係る両面粘着テープが長さ６１ｍｍ及び幅４９ｍｍの矩形の外形を有し、長さ５７ｍｍ及び幅４５ｍｍの矩形の内形を有し、かつ２ｍｍの幅を有する枠状の両面粘着テープ１である場合には、該両面粘着テープをそのまま用いる。本発明に係る両面粘着テープがこのような形状ではない場合には、このような形状に切断する。なお、加圧試験に用いる枠状の両面粘着テープ１の厚みは、本発明に係る両面粘着テープ自体の厚みである。  The double-sided pressure-sensitive adhesive tape 1 according to the present invention has a rectangular outer shape with a length of 61 mm and a width of 49 mm, a rectangular inner shape with a length of 57 mm and a width of 45 mm, and a frame-like double-sided pressure-sensitive adhesive tape 1 having a width of 2 mm. In this case, the double-sided adhesive tape is used as it is. When the double-sided pressure-sensitive adhesive tape according to the present invention is not such a shape, it is cut into such a shape. In addition, the thickness of the frame-shaped double-sided adhesive tape 1 used for a pressurization test is the thickness of the double-sided adhesive tape itself which concerns on this invention.

また、長さ１００ｍｍ、幅１００ｍｍ及び厚み１０ｍｍの矩形を有し、かつ貫通孔２ａを有する第１のアクリル板２を用意する。貫通孔２ａは、直径１ｃｍの円形であることが好ましい。貫通孔２ａは、好ましくは第１のアクリル板２の中心部に設けられる。さらに、長さ１００ｍｍ、幅１００ｍｍ及び厚み１０ｍｍの矩形を有し、かつ貫通孔を有さない第２のアクリル板３を用意する。  Moreover, the 1st acrylic board 2 which has a rectangle of length 100mm, width 100mm, and thickness 10mm, and has the through-hole 2a is prepared. The through hole 2a is preferably circular with a diameter of 1 cm. The through hole 2 a is preferably provided at the center of the first acrylic plate 2. Furthermore, the 2nd acrylic board 3 which has a rectangle of length 100mm, width 100mm, and thickness 10mm, and does not have a through-hole is prepared.

第１のアクリル板２と第２のアクリル板３とを枠状の両面粘着テープ１を介して貼り合わせて、第１のアクリル板２と第２のアクリル板３と枠状の両面粘着テープ１とで囲まれた内部空間１１Ａを有する積層体１１を得る。この積層体１１を用いて、加圧試験が行われる。具体的には、積層体１１における第１のアクリル板２の貫通孔２ａから積層体１１の内部空間１１Ａに空気を入れ、内部空間１１Ａの内圧を３０ｋＰａにする加圧試験を行う。加圧試験時には、枠状の両面粘着テープ１と第１のアクリル板２との接着界面、並びに枠状の両面粘着テープ１と第２のアクリル板３との接着界面は水中に配置されることが好ましい。この場合には、接着界面からの空気漏れを容易に把握することができる。  The 1st acrylic board 2 and the 2nd acrylic board 3 are bonded together via frame-shaped double-sided adhesive tape 1, and the 1st acrylic board 2, 2nd acrylic board 3, and frame-shaped double-sided adhesive tape 1 are attached. A laminated body 11 having an internal space 11A surrounded by is obtained. A pressure test is performed using the laminate 11. Specifically, a pressure test is performed in which air is introduced into the internal space 11A of the multilayer body 11 from the through hole 2a of the first acrylic plate 2 in the multilayer body 11, and the internal pressure of the internal space 11A is set to 30 kPa. During the pressure test, the adhesive interface between the frame-shaped double-sided pressure-sensitive adhesive tape 1 and the first acrylic plate 2 and the adhesive interface between the frame-shaped double-sided pressure-sensitive adhesive tape 1 and the second acrylic plate 3 must be placed in water. Is preferred. In this case, air leakage from the adhesive interface can be easily grasped.

本発明では、上記加圧試験において、枠状の両面粘着テープ１と第１のアクリル板２及び第２のアクリル板３との少なくとも一方の界面で剥離が生じることによって、積層体１１の内部空間１１Ａの内圧が減少し始めるまでの時間（内圧減少開始時間）が５０分以上である。枠状の両面粘着テープ１と第１のアクリル板２及び第２のアクリル板３との少なくとも一方の界面で剥離が生じることによって、積層体１１の内部空間１１Ａの内圧が減少しているか否かは、積層体１１を水中に配置し、上記枠状の両面粘着テープ１と第１のアクリル板２及び第２のアクリル板３との少なくとも一方の界面からの空気が漏れているか否かを観測することにより、判断される。  In the present invention, in the pressure test, peeling occurs at at least one interface between the frame-shaped double-sided pressure-sensitive adhesive tape 1 and the first acrylic plate 2 and the second acrylic plate 3, whereby the internal space of the laminate 11. The time until the internal pressure of 11A starts to decrease (internal pressure decrease start time) is 50 minutes or more. Whether or not the internal pressure of the internal space 11A of the laminate 11 is reduced by peeling at the interface between at least one of the frame-shaped double-sided pressure-sensitive adhesive tape 1 and the first acrylic plate 2 and the second acrylic plate 3. Observes whether air is leaking from at least one interface between the frame-shaped double-sided pressure-sensitive adhesive tape 1 and the first acrylic plate 2 and the second acrylic plate 3 by placing the laminate 11 in water. It is judged by doing.

防水性及び接着性をより一層高める観点からは、上記内圧減少開始時間は長いほどよい。上記内圧減少開始時間は、好ましくは５５分以上、より好ましくは６０分以上、更に好ましくは６５分以上、特に好ましくは７０分以上、最も好ましくは８０分以上である。  From the viewpoint of further improving waterproofness and adhesiveness, the longer the internal pressure decrease start time is, the better. The internal pressure decrease start time is preferably 55 minutes or more, more preferably 60 minutes or more, still more preferably 65 minutes or more, particularly preferably 70 minutes or more, and most preferably 80 minutes or more.

以下、本発明に係る両面粘着テープの他の詳細を説明する。  Hereinafter, other details of the double-sided pressure-sensitive adhesive tape according to the present invention will be described.

［発泡基材の詳細］
衝撃吸収性をより一層高める観点からは、上記発泡基材は、ポリオレフィン系樹脂を架橋及び発泡させることにより得られることが好ましい。上記発泡基材は、架橋ポリオレフィン系樹脂発泡体であることが好ましい。上記発泡基材は内部に複数の気泡を有する。[Details of foam substrate]
From the viewpoint of further improving the impact absorbability, the foamed base material is preferably obtained by crosslinking and foaming a polyolefin resin. The foam base is preferably a crosslinked polyolefin resin foam. The foam base has a plurality of bubbles inside.

上記発泡基材における発泡倍率は好ましくは１．５倍以上、より好ましくは２倍以上、好ましくは１０倍以下、より好ましくは８倍以下である。上記発泡倍率が上記下限以上であると、発泡基材の柔軟性がより一層高くなり、発泡基材の衝撃吸収性がより一層高くなり、衝撃が付与されても剥離が生じ難くなる。上記発泡倍率が上記上限以下であると、発泡基材の強度がより一層高くなり、発泡基材に衝撃が付与されても、発泡基材が破損し難くなる。  The expansion ratio in the foamed substrate is preferably 1.5 times or more, more preferably 2 times or more, preferably 10 times or less, more preferably 8 times or less. When the expansion ratio is equal to or higher than the lower limit, the flexibility of the foamed base material is further increased, the impact absorbability of the foamed base material is further increased, and even when an impact is applied, peeling does not easily occur. When the expansion ratio is not more than the above upper limit, the strength of the foamed base material is further increased, and even if an impact is applied to the foamed base material, the foamed base material is hardly damaged.

上記発泡倍率は、ＪＩＳ Ｋ６７６７に準拠して、電子比重計（ミラージュ社製「ＥＤ１２０Ｔ」）を用いて、見かけ密度を測定した後、見かけ密度の逆数を求めることで算出される。  The foaming ratio is calculated by measuring the apparent density using an electronic hydrometer (“ED120T” manufactured by Mirage) according to JIS K6767 and then calculating the reciprocal of the apparent density.

上記発泡基材の厚み方向の２５％圧縮強度は、好ましくは１０ｋＰａ以上、より好ましくは２５０ｋＰａ以上、更に好ましくは３００ｋＰａ以上、好ましくは１０００ｋＰａ以下、より好ましくは５００ｋＰａ以下、更に好ましくは４００ｋＰａ以下である。２５％圧縮強度が上記下限以上であると、発泡基材の強度がより一層高くなり、発泡基材に衝撃が付与されても、発泡基材が破損し難くなる。２５％圧縮強度が上記上限以下であると、発泡基材の柔軟性がより一層高くなり、発泡基材の衝撃吸収性がより一層高くなり、衝撃が付与されても剥離が生じ難くなる。  The 25% compressive strength in the thickness direction of the foamed substrate is preferably 10 kPa or more, more preferably 250 kPa or more, still more preferably 300 kPa or more, preferably 1000 kPa or less, more preferably 500 kPa or less, and still more preferably 400 kPa or less. When the 25% compressive strength is not less than the above lower limit, the strength of the foamed substrate is further increased, and even if an impact is applied to the foamed substrate, the foamed substrate is hardly damaged. When the 25% compressive strength is less than or equal to the above upper limit, the flexibility of the foamed base material is further increased, the impact absorbability of the foamed base material is further increased, and even if an impact is applied, peeling does not easily occur.

厚み方向の２５％圧縮強度は、ＪＩＳ Ｋ６７６７に準拠して測定される。例えば、２０ｍｍ×２０ｍｍに裁断した発泡基材を重ね合わせて、厚み１０ｍｍの積層体を作製する。この積層体を２３℃下に放置した後、２３℃にて、積層体の厚み方向の２５％圧縮強度を測定する。  The 25% compressive strength in the thickness direction is measured according to JIS K6767. For example, a laminated body having a thickness of 10 mm is produced by stacking foam base materials cut to 20 mm × 20 mm. After this laminate is left at 23 ° C., the 25% compressive strength in the thickness direction of the laminate is measured at 23 ° C.

上記発泡基材の厚みは特に限定されない。上記発泡基材の厚みは好ましくは０．０２ｍｍ以上、より好ましくは０．０３ｍｍ以上、更に好ましくは０．０５ｍｍ以上、好ましくは１．２ｍｍ以下、より好ましくは１．０ｍｍ以下、更に好ましくは０．５ｍｍ以下である。上記厚みが上記下限以上であると、発泡基材の強度がより一層高くなり、発泡基材に衝撃が付与されても、発泡基材が破損し難くなる。上記厚みが上記上限以下であると、発泡基材の柔軟性がより一層高くなり、発泡基材の衝撃吸収性がより一層高くなり、衝撃が付与されても剥離が生じ難くなり、更に被着体の形状に追従して貼り合わせることがより一層容易になる。また、上記厚みが上記上限以下であると、電子機器等の小型化及び薄型化に対応できる。  The thickness of the said foaming base material is not specifically limited. The thickness of the foamed substrate is preferably 0.02 mm or more, more preferably 0.03 mm or more, still more preferably 0.05 mm or more, preferably 1.2 mm or less, more preferably 1.0 mm or less, still more preferably 0.00. 5 mm or less. When the thickness is equal to or more than the lower limit, the strength of the foamed base material is further increased, and even if an impact is applied to the foamed base material, the foamed base material is hardly damaged. When the thickness is less than or equal to the above upper limit, the flexibility of the foamed base material is further increased, the impact absorption of the foamed base material is further increased, and even if an impact is applied, peeling does not easily occur, and further It becomes even easier to follow the shape of the body and stick together. Moreover, it can respond to size reduction and thickness reduction of an electronic device etc. as the said thickness is below the said upper limit.

＜ポリオレフィン系樹脂＞
上記発泡基材を形成するために用いられるポリオレフィン系樹脂としては、特に限定されないが、エチレン単独重合体、エチレン−α−オレフィン共重合体、エチレン−（メタ）アクリル酸共重合体、エチレン−（メタ）アクリル酸エステル共重合体、及びエチレン−酢酸ビニル共重合体などのポリエチレン系樹脂；プロピレン単独重合体、プロピレン−α−オレフィン共重合体、及びプロピレン−エチレン共重合体などのポリプロピレン系樹脂；ブテン単独重合体；ブタジエン及びイソプレンなどの共役ジエンの単独重合体又は共重合体等が挙げられる。また、上記ポリエチレン系樹脂としては、高密度ポリエチレン及び低密度ポリエチレン等が挙げられる。共重合の形態は、ランダムであってもよく、ブロックであってもよく、三元共重合体の形態であってもよい。<Polyolefin resin>
Although it does not specifically limit as polyolefin resin used in order to form the said foaming base material, An ethylene homopolymer, an ethylene-alpha-olefin copolymer, an ethylene- (meth) acrylic acid copolymer, ethylene- ( Polyethylene resins such as (meth) acrylic acid ester copolymers and ethylene-vinyl acetate copolymers; polypropylene resins such as propylene homopolymers, propylene-α-olefin copolymers, and propylene-ethylene copolymers; Examples include butene homopolymers; homopolymers or copolymers of conjugated dienes such as butadiene and isoprene. Examples of the polyethylene resin include high density polyethylene and low density polyethylene. The form of copolymerization may be random, block, or terpolymer.

上記ポリオレフィン系樹脂は、ポリエチレン系樹脂又はポリプロピレン系樹脂であってもよく、ポリエチレン系樹脂であってもよく、ポリプロピレン系樹脂であってもよい。ポリエチレン系樹脂とポリプロピレン系樹脂とを混合して用いてもよい。  The polyolefin resin may be a polyethylene resin or a polypropylene resin, a polyethylene resin, or a polypropylene resin. A mixture of a polyethylene resin and a polypropylene resin may be used.

上記ポリエチレン系樹脂は、エチレンを主成分として用いて得られる。上記ポリエチレン系樹脂の全構造単位１００重量％中、エチレンに由来する構造単位の割合は好ましくは５０重量％以上、より好ましくは７０重量％以上、更に好ましくは９０重量％以上である。  The polyethylene resin is obtained using ethylene as a main component. The proportion of structural units derived from ethylene is preferably 50% by weight or more, more preferably 70% by weight or more, and still more preferably 90% by weight or more, in 100% by weight of all the structural units of the polyethylene resin.

上記ポリプロピレン系樹脂は、プロピレンを主成分として用いて得られる。上記ポリプロピレン系樹脂の全構造単位１００重量％中、プロピレンに由来する構造単位の割合は好ましくは５０重量％以上、より好ましくは７０重量％以上、更に好ましくは９０重量％以上である。  The polypropylene resin is obtained using propylene as a main component. The proportion of structural units derived from propylene is preferably 50% by weight or more, more preferably 70% by weight or more, and still more preferably 90% by weight or more in 100% by weight of all the structural units of the polypropylene resin.

衝撃吸収性をより一層高める観点から、上記ポリオレフィン系樹脂は、好ましくはポリエチレン系樹脂であり、より好ましくは低密度ポリエチレンであり、更に好ましくは直鎖状低密度ポリエチレンである。また、上記ポリエチレン系樹脂は、エチレン単独重合体でもよいが、上記ポリエチレン系樹脂は、全構造単位１００重量％中、エチレンに由来する構造単位を好ましくは７０重量％以上、より好ましくは９０重量％以上有し、α−オレフィン構造単位を好ましくは３０重量％以下、より好ましくは１０重量％以下有するポリエチレン系樹脂であることが好ましい。  From the viewpoint of further improving the impact absorbability, the polyolefin resin is preferably a polyethylene resin, more preferably a low density polyethylene, and still more preferably a linear low density polyethylene. The polyethylene-based resin may be an ethylene homopolymer, but the polyethylene-based resin is preferably 70% by weight or more, more preferably 90% by weight of structural units derived from ethylene in 100% by weight of all structural units. It is preferable that the polyethylene-based resin have the α-olefin structural unit in an amount of 30% by weight or less, more preferably 10% by weight or less.

また、メタロセン化合物の重合触媒を用いて得られたポリエチレン系樹脂を用いることにより、特にメタロセン化合物の重合触媒を用いて得られた直鎖状低密度ポリエチレンを用いることにより、柔軟性が高くかつ衝撃吸収性が高い発泡基材が得やすくなる。また、発泡基材の厚みを薄くしても、高い性能を維持しやすくなる。  In addition, by using a polyethylene resin obtained by using a polymerization catalyst of a metallocene compound, particularly by using a linear low density polyethylene obtained by using a polymerization catalyst of a metallocene compound, the flexibility and impact are high. It becomes easy to obtain a foam base material having high absorbability. Moreover, even if the thickness of the foamed substrate is reduced, high performance is easily maintained.

見かけ密度、及び、厚み方向の２５％圧縮強度を上記範囲に調整するためには、上記ポリオレフィン系樹脂は、重合触媒として四価の遷移金属を含むメタロセン化合物を用いて得られるポリオレフィン系樹脂（メタロセン系ポリオレフィン系樹脂）であることが好ましい。なかでも、メタロセン化合物を用いて得られたポリエチレン系樹脂（メタロセン系ポリエチレン系樹脂）が好ましい。上記メタロセン化合物としては、例えば、カミンスキー触媒等が挙げられる。  In order to adjust the apparent density and the 25% compressive strength in the thickness direction to the above ranges, the polyolefin resin is a polyolefin resin (metallocene) obtained by using a metallocene compound containing a tetravalent transition metal as a polymerization catalyst. (Polyolefin resin). Among these, a polyethylene resin (metallocene polyethylene resin) obtained using a metallocene compound is preferable. Examples of the metallocene compounds include Kaminsky catalysts.

上記メタロセン系ポリエチレン系樹脂としては、例えば、上記メタロセン化合物を用いて、エチレンと、必要に応じて配合される他のα−オレフィンとを共重合することにより得られたポリエチレン系樹脂等が挙げられる。上記他のα−オレフィンとして、例えば、プロペン、１−ブテン、１−ペンテン、及び１−ヘキセン等が挙げられる。  Examples of the metallocene-based polyethylene resin include polyethylene-based resins obtained by copolymerizing ethylene and other α-olefins blended as necessary using the metallocene compound. . Examples of the other α-olefins include propene, 1-butene, 1-pentene, and 1-hexene.

上記ポリオレフィン系樹脂は、上記メタロセン系ポリエチレン系樹脂に加えて、更に、他のオレフィン系樹脂を含んでいてもよい。上記他のオレフィン系樹脂として、例えば、ポリエチレン、ポリプロピレン、及びエチレン−プロピレン共重合体等が挙げられる。  In addition to the metallocene polyethylene resin, the polyolefin resin may further contain another olefin resin. Examples of the other olefin-based resin include polyethylene, polypropylene, and ethylene-propylene copolymer.

上記発泡基材を形成するためのポリオレフィン系樹脂１００重量％中、上記メタロセン系ポリエチレン系樹脂の含有量は、好ましくは４０重量％以上、好ましくは１００重量％（全量）以下である。上記メタロセン系ポリエチレン系樹脂の含有量が上記下限以上であると、発泡基材の厚みが薄くても、発泡基材の２５％圧縮強度が高くなる。  The content of the metallocene polyethylene resin is preferably 40% by weight or more, and preferably 100% by weight (total amount) or less in 100% by weight of the polyolefin resin for forming the foamed substrate. When the content of the metallocene-based polyethylene resin is not less than the above lower limit, even if the thickness of the foamed substrate is thin, the 25% compressive strength of the foamed substrate is increased.

上記発泡基材は、架橋されていることが好ましい。従って、上記発泡基材は、ポリオレフィン系樹脂を架橋及び発泡させることにより得られることが好ましい。上記発泡基材が架橋されていることで、見かけ密度、及び、厚み方向の２５％圧縮強度を上記範囲に調整しやすくなり、衝撃吸収性を高めることが容易になる。  The foamed substrate is preferably cross-linked. Therefore, it is preferable that the said foaming base material is obtained by bridge | crosslinking and foaming polyolefin-type resin. Since the foamed base material is crosslinked, the apparent density and the 25% compressive strength in the thickness direction can be easily adjusted to the above ranges, and the impact absorbability can be easily increased.

上記ポリオレフィン発泡体を架橋させる方法は特に限定されず、例えば、発泡体に電子線、α線、β線又はγ線等の電離性放射線を照射する方法、並びに発泡体に予め配合しておいた有機過酸化物を加熱により分解させる方法等が挙げられる。  The method for crosslinking the polyolefin foam is not particularly limited. For example, the foam is irradiated with ionizing radiation such as electron beam, α-ray, β-ray or γ-ray, and blended in advance in the foam. Examples include a method of decomposing an organic peroxide by heating.

上記発泡基材の製造方法は特に限定されない。上記発泡基材の製造方法として、ポリオレフィン系樹脂と発泡剤とを含有する発泡性樹脂組成物を調製し、この発泡性樹脂組成物を押出機を用いてシート状に押出加工する際に発泡剤を発泡させ、得られたシート状の発泡体を必要に応じて架橋させる方法が好ましい。  The manufacturing method of the said foaming base material is not specifically limited. As a method for producing the foamed substrate, a foamable resin composition containing a polyolefin resin and a foaming agent is prepared, and the foamable resin composition is extruded into a sheet using an extruder. A method is preferred in which the sheet-like foam is crosslinked as necessary.

［第１，第２の粘着剤層の詳細］
＜（メタ）アクリル系粘着剤＞
上記第１，第２の粘着剤層はそれぞれ、（メタ）アクリル系粘着剤により形成されており、（メタ）アクリル系粘着剤を含む。上記第１の粘着剤層に含まれる（メタ）アクリル系粘着剤と、上記第２の粘着剤層に含まれる（メタ）アクリル系粘着剤とは同一であってもよく、異なっていてもよい。[Details of first and second pressure-sensitive adhesive layers]
<(Meth) acrylic adhesive>
Each of the first and second pressure-sensitive adhesive layers is formed of a (meth) acrylic pressure-sensitive adhesive and includes a (meth) acrylic pressure-sensitive adhesive. The (meth) acrylic pressure-sensitive adhesive contained in the first pressure-sensitive adhesive layer and the (meth) acrylic pressure-sensitive adhesive contained in the second pressure-sensitive adhesive layer may be the same or different. .

上記第１の粘着剤層に含まれる上記（メタ）アクリル系粘着剤及び上記第２の粘着剤層に含まれる上記（メタ）アクリル系粘着剤はそれぞれ、（メタ）アクリル重合体を含む。該（メタ）アクリル重合体には（メタ）アクリル共重合体が含まれる。上記第１の粘着剤層に含まれる上記（メタ）アクリル系粘着剤及び上記第２の粘着剤層に含まれる上記（メタ）アクリル系粘着剤はそれぞれ、重量平均分子量（Ｍｗ）の数平均分子量（Ｍｎ）に対する比（Ｍｗ／Ｍｎ）が１０以上、１５以下である（メタ）アクリル重合体を含むことが好ましい。（メタ）アクリル重合体の上記比（Ｍｗ／Ｍｎ）が上記下限以上及び上記上限以下であると、高い接着性と高い防水性との双方をより一層高いレベルで両立することができる。  The (meth) acrylic pressure-sensitive adhesive contained in the first pressure-sensitive adhesive layer and the (meth) acrylic pressure-sensitive adhesive contained in the second pressure-sensitive adhesive layer each contain a (meth) acrylic polymer. The (meth) acrylic polymer includes a (meth) acrylic copolymer. The (meth) acrylic pressure-sensitive adhesive contained in the first pressure-sensitive adhesive layer and the (meth) acrylic pressure-sensitive adhesive contained in the second pressure-sensitive adhesive layer are each a number average molecular weight (Mw). It is preferable to include a (meth) acrylic polymer having a ratio (Mw / Mn) to (Mn) of 10 or more and 15 or less. When the ratio (Mw / Mn) of the (meth) acrylic polymer is not less than the above lower limit and not more than the above upper limit, both high adhesiveness and high waterproofness can be achieved at an even higher level.

高い接着性と高い防水性との双方をより一層高いレベルで両立する観点からは、上記（メタ）アクリル重合体の重量平均分子量（Ｍｗ）は好ましくは５０万以上、好ましくは７０万以下である。  From the viewpoint of achieving both high adhesion and high waterproofness at an even higher level, the weight average molecular weight (Mw) of the (meth) acrylic polymer is preferably 500,000 or more, preferably 700,000 or less. .

上記比（Ｍｗ／Ｍｎ）及び上記重量平均分子量（Ｍｗ）を上記範囲に調整するためには、重合開始剤、重合温度等の重合条件を調整すればよい。  In order to adjust the ratio (Mw / Mn) and the weight average molecular weight (Mw) to the above ranges, polymerization conditions such as a polymerization initiator and a polymerization temperature may be adjusted.

上記重量平均分子量（Ｍｗ）及び上記数平均分子量（Ｍｎ）は、ゲルパーミエーションクロマトグラフィー（ＧＰＣ）により測定されるポリスチレン換算での重量平均分子量を示す。  The said weight average molecular weight (Mw) and the said number average molecular weight (Mn) show the weight average molecular weight in polystyrene conversion measured by gel permeation chromatography (GPC).

上記（メタ）アクリル重合体は、ブチルアクリレートと２−エチルヘキシルアクリレートとを含むモノマー混合物を共重合して得られた（メタ）アクリル共重合体であることが好ましい。上記（メタ）アクリル重合体を構成する全モノマー（モノマー混合物）１００重量％中、ブチルアクリレートの含有量は好ましくは４０重量％以上、好ましくは８０重量％以下である。上記アクリル重合体を構成する全モノマー１００重量％中、２−エチルヘキシルアクリレートの含有量は好ましくは１０重量％以上、好ましくは４０重量％以下である。  The (meth) acrylic polymer is preferably a (meth) acrylic copolymer obtained by copolymerizing a monomer mixture containing butyl acrylate and 2-ethylhexyl acrylate. The content of butyl acrylate is preferably 40% by weight or more and preferably 80% by weight or less in 100% by weight of all monomers (monomer mixture) constituting the (meth) acrylic polymer. The content of 2-ethylhexyl acrylate is preferably 10% by weight or more, and preferably 40% by weight or less, in 100% by weight of all monomers constituting the acrylic polymer.

上記モノマー混合物は、必要に応じてブチルアクリレート及び２−エチルヘキシルアクリレート以外の共重合可能な他の重合性モノマーを含んでいてもよい。  The monomer mixture may contain other polymerizable monomers other than butyl acrylate and 2-ethylhexyl acrylate as necessary.

上記共重合可能な他の重合性モノマーとして、例えば、（メタ）アクリル酸メチル、（メタ）アクリル酸エチル、（メタ）アクリル酸ｎ−プロピル、（メタ）アクリル酸イソプロピル等のアルキル基の炭素数が１〜３の（メタ）アクリル酸アルキルエステル；メタクリル酸トリデシル、（メタ）アクリル酸ステアリル等のアルキル基の炭素数が１３〜１８の（メタ）アクリル酸アルキルエステル；（メタ）アクリル酸イソボルニル、（メタ）アクリル酸ヒドロキシアルキル、グリセリンジメタクリレート、（メタ）アクリル酸グリシジル、２−メタクリロイルオキシエチルイソシアネート、（メタ）アクリル酸、イタコン酸、無水マレイン酸、クロトン酸、マレイン酸、フマル酸等の官能性モノマーが挙げられる。  Examples of other polymerizable monomers that can be copolymerized include, for example, carbon number of alkyl groups such as methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, and isopropyl (meth) acrylate. (Meth) acrylic acid alkyl ester having 1 to 3; (meth) acrylic acid alkyl ester having 13 to 18 carbon atoms in the alkyl group such as tridecyl methacrylate and stearyl (meth) acrylate; isobornyl (meth) acrylate, Functionality such as hydroxyalkyl (meth) acrylate, glycerin dimethacrylate, glycidyl (meth) acrylate, 2-methacryloyloxyethyl isocyanate, (meth) acrylic acid, itaconic acid, maleic anhydride, crotonic acid, maleic acid, fumaric acid, etc. Ionic monomer.

上記モノマー混合物を共重合させて上記（メタ）アクリル共重合体を得るには、上記モノマー混合物を、重合開始剤の存在下にてラジカル反応させる。上記モノマー混合物をラジカル反応させる方法、即ち、重合方法としては、従来公知の方法が用いられる。重合方法としては、例えば、溶液重合法（沸点重合法又は定温重合法）、乳化重合法、懸濁重合法、及び塊状重合法等が挙げられる。  In order to copolymerize the monomer mixture to obtain the (meth) acrylic copolymer, the monomer mixture is subjected to a radical reaction in the presence of a polymerization initiator. A conventionally known method is used as a method of radical reaction of the monomer mixture, that is, a polymerization method. Examples of the polymerization method include a solution polymerization method (boiling point polymerization method or constant temperature polymerization method), an emulsion polymerization method, a suspension polymerization method, and a bulk polymerization method.

上記重合開始剤は特に限定されず、例えば、有機過酸化物、及びアゾ化合物等が挙げられる。上記有機過酸化物として、例えば、１，１−ビス（ｔ−ヘキシルパーオキシ）−３，３，５−トリメチルシクロヘキサン、ｔ−ヘキシルパーオキシピバレート、ｔ−ブチルパーオキシピバレート、２，５−ジメチル−２，５−ビス（２−エチルヘキサノイルパーオキシ）ヘキサン、ｔ−ヘキシルパーオキシ−２−エチルヘキサノエート、ｔ−ブチルパーオキシ−２−エチルヘキサノエート、ｔ−ブチルパーオキシイソブチレート、ｔ−ブチルパーオキシ−３，５，５−トリメチルヘキサノエート、及びｔ−ブチルパーオキシラウレート等が挙げられる。上記アゾ化合物として、例えば、アゾビスイソブチロニトリル、及びアゾビスシクロヘキサンカルボニトリル等が挙げられる。上記重合開始剤は単独で用いてもよいし、２種以上を併用してもよい。  The said polymerization initiator is not specifically limited, For example, an organic peroxide, an azo compound, etc. are mentioned. Examples of the organic peroxide include 1,1-bis (t-hexylperoxy) -3,3,5-trimethylcyclohexane, t-hexylperoxypivalate, t-butylperoxypivalate, 2,5 -Dimethyl-2,5-bis (2-ethylhexanoylperoxy) hexane, t-hexylperoxy-2-ethylhexanoate, t-butylperoxy-2-ethylhexanoate, t-butylperoxy Examples include isobutyrate, t-butylperoxy-3,5,5-trimethylhexanoate, and t-butylperoxylaurate. Examples of the azo compound include azobisisobutyronitrile and azobiscyclohexanecarbonitrile. The said polymerization initiator may be used independently and may use 2 or more types together.

高い接着性と高い防水性との双方をより一層高いレベルで両立する観点からは、上記第１の粘着剤層に含まれる上記（メタ）アクリル系粘着剤及び上記第２の粘着剤層に含まれる上記（メタ）アクリル系粘着剤はそれぞれ、粘着付与剤を含むことが好ましい。  From the viewpoint of achieving both high adhesiveness and high waterproofness at an even higher level, it is included in the (meth) acrylic pressure-sensitive adhesive and the second pressure-sensitive adhesive layer contained in the first pressure-sensitive adhesive layer. Each of the (meth) acrylic pressure-sensitive adhesives preferably contains a tackifier.

上記第１，第２の粘着剤層において、上記（メタ）アクリル重合体１００重量部に対する上記粘着付与樹脂の各含有量は好ましくは３６重量部以上、より好ましくは４１重量部以上、更に好ましくは４５重量部以上、好ましくは５０重量部以下である。上記粘着付与樹脂の含有量が上記下限以上であると、接着性及び防水性がより一層高くなり、上記内圧減少開始時間がより一層長くなる。  In the first and second pressure-sensitive adhesive layers, the content of the tackifying resin with respect to 100 parts by weight of the (meth) acrylic polymer is preferably 36 parts by weight or more, more preferably 41 parts by weight or more, and still more preferably. 45 parts by weight or more, preferably 50 parts by weight or less. When the content of the tackifying resin is not less than the above lower limit, the adhesiveness and waterproofness are further enhanced, and the internal pressure reduction start time is further prolonged.

上記粘着付与樹脂としては、例えば、ロジンエステル系樹脂、水添ロジン系樹脂、テルペン系樹脂、テルペンフェノール系樹脂、クマロンインデン系樹脂、脂環族飽和炭化水素系樹脂、Ｃ５系石油樹脂、Ｃ９系石油樹脂、及びＣ５−Ｃ９共重合系石油樹脂等が挙げられる。上記粘着付与樹脂は単独で用いてもよいし、２種以上を併用してもよい。  Examples of the tackifier resins include rosin ester resins, hydrogenated rosin resins, terpene resins, terpene phenol resins, coumarone indene resins, alicyclic saturated hydrocarbon resins, C5 petroleum resins, C9. And C5-C9 copolymer petroleum resin. The above tackifying resins may be used alone or in combination of two or more.

上記第１，第２の粘着剤層では、架橋剤が添加されることにより上記第１，第２の粘着剤層を構成する樹脂（上記（メタ）アクリル重合体、及び上記（メタ）アクリル重合体と上記粘着付与樹脂）の主鎖間に架橋構造が形成されていることが好ましい。  In the first and second pressure-sensitive adhesive layers, a resin (the (meth) acrylic polymer and the (meth) acrylic polymer) constituting the first and second pressure-sensitive adhesive layers by adding a crosslinking agent. It is preferable that a crosslinked structure is formed between the main chain of the coalescence and the tackifying resin.

上記架橋剤は特に限定されず、例えば、イソシアネート系架橋剤、アジリジン系架橋剤、エポキシ系架橋剤、及び金属キレート型架橋剤等が挙げられる。なかでも、イソシアネート系架橋剤が好ましい。上記第１，第２の粘着剤層にイソシアネート系架橋剤が添加されることで、イソシアネート系架橋剤のイソシアネート基と上記第１，第２の粘着剤層を構成する樹脂中のアルコール性水酸基とが反応して、上記第１，第２の粘着剤層の架橋が緩くなる。従って、上記第１，第２の粘着剤層において、断続的に加わる剥離応力を分散させることができ、強い衝撃が加わった場合に被着体の変形に伴って生じる剥離応力に対し、被着体からの剥離耐性がより向上する。  The said crosslinking agent is not specifically limited, For example, an isocyanate type crosslinking agent, an aziridine type crosslinking agent, an epoxy-type crosslinking agent, a metal chelate type crosslinking agent, etc. are mentioned. Of these, isocyanate-based crosslinking agents are preferred. By adding an isocyanate-based crosslinking agent to the first and second pressure-sensitive adhesive layers, an isocyanate group of the isocyanate-based crosslinking agent and an alcoholic hydroxyl group in the resin constituting the first and second pressure-sensitive adhesive layers Reacts and the cross-linking of the first and second pressure-sensitive adhesive layers becomes loose. Therefore, in the first and second pressure-sensitive adhesive layers, it is possible to disperse the peeling stress that is intermittently applied, and against the peeling stress that occurs due to deformation of the adherend when a strong impact is applied. The peel resistance from the body is further improved.

上記（メタ）アクリル重合体１００重量部に対して、上記架橋剤の添加量は好ましくは０．０１重量部以上、より好ましくは０．１重量部以上、好ましくは１０重量部以下、より好ましくは３重量部以下である。  The addition amount of the crosslinking agent is preferably 0.01 parts by weight or more, more preferably 0.1 parts by weight or more, preferably 10 parts by weight or less, more preferably 100 parts by weight of the (meth) acrylic polymer. 3 parts by weight or less.

上記第１，第２の粘着剤層の各ゲル分率は、好ましくは１５重量％以上、より好ましくは２０重量％以上、更に好ましくは２５重量％以上、特に好ましくは３０重量％以上、好ましくは６０重量％以下、より好ましくは５０重量％以下である。上記ゲル分率が上記下限以上及び上記上限以下であると、高い接着性と高い防水性との双方をより一層高いレベルで両立することができる。  Each gel fraction of the first and second pressure-sensitive adhesive layers is preferably 15% by weight or more, more preferably 20% by weight or more, still more preferably 25% by weight or more, particularly preferably 30% by weight or more, preferably 60% by weight or less, more preferably 50% by weight or less. When the said gel fraction is more than the said minimum and below the said upper limit, both high adhesiveness and high waterproofness can be made compatible at a still higher level.

上記ゲル分率は以下のようにして測定される。  The gel fraction is measured as follows.

粘着剤層をＷ１（ｇ）採取し、採取した粘着剤層を酢酸エチル中に２３℃にて２４時間浸漬した際の不溶解分を２００メッシュの金網で濾過する。この金網上の残渣を１１０℃にて加熱乾燥し、得られた乾燥残渣の重量Ｗ２（ｇ）を測定し、下記式（１）によりゲル分率（架橋度）を算出する。  W1 (g) of the pressure-sensitive adhesive layer is collected, and the insoluble matter when the collected pressure-sensitive adhesive layer is immersed in ethyl acetate at 23 ° C. for 24 hours is filtered through a 200-mesh wire mesh. The residue on the wire net is heated and dried at 110 ° C., the weight W2 (g) of the obtained dry residue is measured, and the gel fraction (crosslinking degree) is calculated by the following formula (1).

ゲル分率（重量％）＝１００×Ｗ２／Ｗ１ （１）  Gel fraction (% by weight) = 100 × W2 / W1 (1)

上記第１，第２の粘着剤層の各厚みは、好ましくは５μｍ以上、より好ましくは７μｍ以上、更に好ましくは１０μｍ以上、特に好ましくは２５μｍ以上、好ましくは４００μｍ以下、より好ましくは２００μｍ以下、更に好ましくは１５０μｍ以下、特に好ましくは１００μｍ以下である。上記第１，第２の粘着剤層の各厚みが上記下限以上であると高い接着性と高い防水性との双方をより一層高いレベルで両立することができる。上記上限以下であると、両面粘着テープの厚み、及び両面粘着テープを用いた電子機器の厚みが薄くなる。  Each thickness of the first and second pressure-sensitive adhesive layers is preferably 5 μm or more, more preferably 7 μm or more, further preferably 10 μm or more, particularly preferably 25 μm or more, preferably 400 μm or less, more preferably 200 μm or less, and further Preferably it is 150 micrometers or less, Most preferably, it is 100 micrometers or less. When each thickness of the said 1st, 2nd adhesive layer is more than the said minimum, both high adhesiveness and high waterproofness can be made compatible at a still higher level. When the thickness is not more than the above upper limit, the thickness of the double-sided pressure-sensitive adhesive tape and the thickness of the electronic device using the double-sided pressure-sensitive adhesive tape are reduced.

［両面粘着テープの他の詳細］
上記粘着テープの厚みは、好ましくは５０μｍ以上、より好ましくは１５０μｍ以上、好ましくは２ｍｍ以下、より好ましくは１ｍｍ以下、更に好ましくは４００μｍ以下である。[Other details of double-sided adhesive tape]
The thickness of the adhesive tape is preferably 50 μm or more, more preferably 150 μm or more, preferably 2 mm or less, more preferably 1 mm or less, and still more preferably 400 μm or less.

上記両面粘着テープの製造方法として、例えば、以下のような方法が挙げられる。  As a manufacturing method of the said double-sided adhesive tape, the following methods are mentioned, for example.

まず、（メタ）アクリル重合体に、必要に応じて粘着付与樹脂や架橋剤等を加え、また溶剤を加えて粘着剤Ａの溶液を作製する。この粘着剤Ａの溶液を発泡基材の表面に塗布する。溶液中の溶剤を完全に乾燥除去して、粘着剤層Ａを形成する。次に、形成された粘着剤層Ａの上に離型フィルムをその離型処理面が粘着剤層Ａに対向した状態に重ね合わせる。この結果、離型フィルム／粘着剤層Ａ／発泡基材の積層構造を有する第１の積層フィルムが得られる。  First, a tackifier resin, a crosslinking agent, or the like is added to the (meth) acrylic polymer as necessary, and a solvent is added to prepare a solution of the pressure-sensitive adhesive A. This adhesive A solution is applied to the surface of the foam substrate. The pressure-sensitive adhesive layer A is formed by completely removing the solvent in the solution by drying. Next, the release film is superimposed on the pressure-sensitive adhesive layer A so that the release treatment surface faces the pressure-sensitive adhesive layer A. As a result, a first laminated film having a release film / adhesive layer A / foamed substrate laminate structure is obtained.

次いで、（メタ）アクリル重合体に、必要に応じて粘着付与樹脂や架橋剤等を加え、また溶剤を加えて粘着剤Ｂの溶液を作製し、上記離型フィルムとは別の離型フィルムを用意する。この離型フィルムの離型処理面に粘着剤Ｂの溶液を塗布し、溶液中の溶剤を完全に乾燥除去することにより、離型フィルムの表面に粘着剤層Ｂが形成する。この結果、離型フィルム／粘着剤層Ｂの積層構造を有する第２の積層フィルムを作製する。  Next, a tackifying resin, a crosslinking agent, etc. are added to the (meth) acrylic polymer as necessary, and a solvent is added to prepare a solution of the adhesive B, and a release film different from the above release film is prepared. prepare. The pressure-sensitive adhesive layer B is formed on the surface of the release film by applying the solution of the pressure-sensitive adhesive B to the release treatment surface of the release film and completely removing the solvent in the solution by drying. As a result, a second laminated film having a release film / adhesive layer B laminated structure is produced.

得られた第１の積層フィルムの発泡基材の裏面に、第２の積層フィルムを粘着剤層Ｂ側から重ね合わせて積層体を得る。そして、上記積層体をゴムローラ等によって加圧することによって、発泡基材の両面に粘着剤層Ａ，Ｂを有し、かつ、粘着剤層Ａ，Ｂの各表面が離型フィルムで覆われた両面粘着テープが得られる。  A laminated body is obtained by superposing the second laminated film on the back surface of the foamed base material of the obtained first laminated film from the pressure-sensitive adhesive layer B side. And by pressing the said laminated body with a rubber roller etc., both surfaces which have adhesive layer A and B on both surfaces of the foaming base material, and each surface of adhesive layer A and B was covered with the release film An adhesive tape is obtained.

他の方法では、同様の要領で、離型フィルム／粘着剤層の積層構造を有する積層フィルムを２つ作製する。この２つの積層フィルムを粘着剤層側から発泡基材の両面のそれぞれに重ね合わせて積層体を作製する。この積層体をゴムローラ等によって加圧することによって、基材の両面に粘着剤層を有し、かつ、２つの粘着剤層の各表面が離型フィルムで覆われた両面粘着テープを得る。  In another method, two laminated films having a release film / adhesive layer laminated structure are produced in the same manner. The two laminated films are laminated on both sides of the foamed substrate from the pressure-sensitive adhesive layer side to produce a laminate. By pressing the laminated body with a rubber roller or the like, a double-sided pressure-sensitive adhesive tape having pressure-sensitive adhesive layers on both surfaces of the base material and each surface of the two pressure-sensitive adhesive layers covered with a release film is obtained.

上記両面粘着テープの用途は特に限定されない。上記両面粘着テープは、電子機器用両面粘着テープであることが好ましく、携帯電子機器用両面粘着テープであることがより好ましい。上記両面粘着テープは、携帯電子機器を構成する部品を機器本体に接着固定するために用いられることがより好ましい。上記両面粘着テープは、例えば、携帯電子機器の液晶表示パネルを機器本体に接着固定する両面粘着テープとして特に用いることができる。  The use of the double-sided pressure-sensitive adhesive tape is not particularly limited. The double-sided pressure-sensitive adhesive tape is preferably a double-sided pressure-sensitive adhesive tape for electronic devices, and more preferably a double-sided pressure-sensitive adhesive tape for portable electronic devices. The double-sided pressure-sensitive adhesive tape is more preferably used for bonding and fixing a component constituting the portable electronic device to the device main body. The double-sided pressure-sensitive adhesive tape can be particularly used as, for example, a double-sided pressure-sensitive adhesive tape for bonding and fixing a liquid crystal display panel of a portable electronic device to the device body.

これらの用途における上記両面粘着テープの形状は特に限定されないが、長方形、額縁状、円形、楕円形、及びドーナツ型等が挙げられる。  Although the shape of the said double-sided adhesive tape in these uses is not specifically limited, A rectangular shape, frame shape, circular shape, an ellipse shape, a donut shape, etc. are mentioned.

以下に実施例を挙げて本発明を更に詳しく説明する。本発明はこれら実施例のみに限定されない。  Hereinafter, the present invention will be described in more detail with reference to examples. The present invention is not limited to these examples.

（（メタ）アクリル共重合体（ａ）の調製）
温度計、攪拌機、冷却管を備えた反応器に、ブチルアクリレート７２重量部、２−エチルヘキシルアクリレート２０重量部、エチルアクリレート５重量部、アクリル酸３重量部、２−ヒドロキシエチルアクリレート０．１重量部、及び、酢酸エチル８０重量部を加え、窒素置換した。その後、反応器を加熱して還流を開始した。続いて、上記反応器内に、重合開始剤としてアゾビスイソブチロニトリル０．１重量部を添加した。７０℃で５時間還流させて、（メタ）アクリル共重合体（ａ）の溶液を得た。(Preparation of (meth) acrylic copolymer (a))
In a reactor equipped with a thermometer, a stirrer, and a condenser, butyl acrylate 72 parts by weight, 2-ethylhexyl acrylate 20 parts by weight, ethyl acrylate 5 parts by weight, acrylic acid 3 parts by weight, 2-hydroxyethyl acrylate 0.1 parts by weight And 80 parts by weight of ethyl acetate were added, and the atmosphere was replaced with nitrogen. Thereafter, the reactor was heated to start refluxing. Subsequently, 0.1 part by weight of azobisisobutyronitrile was added as a polymerization initiator in the reactor. The solution was refluxed at 70 ° C. for 5 hours to obtain a solution of (meth) acrylic copolymer (a).

得られた（メタ）アクリル共重合体（ａ）について、カラムとしてＷａｔｅｒ社製「２６９０ Ｓｅｐａｒａｔｉｏｎｓ Ｍｏｄｅｌ」を用いてＧＰＣ法により重量平均分子量（Ｍｗ）と数平均分子量（Ｍｎ）とを測定した。比（Ｍｗ／Ｍｎ）を算出したところ、１２．２であった。また、Ｍｗが６２万であった。  About the obtained (meth) acrylic copolymer (a), the weight average molecular weight (Mw) and the number average molecular weight (Mn) were measured by GPC method using "2690 Separations Model" made from Water as a column. It was 12.2 when ratio (Mw / Mn) was computed. Moreover, Mw was 620,000.

（（メタ）アクリル共重合体（ｂ）の調製）
ブチルアクリレート５８重量部、２−エチルヘキシルアクリレート３４重量部、エチルアクリレート５重量部、アクリル酸３重量部、及び２−ヒドロキシエチルアクリレート０．１重量部を用い、重合開始剤としてアゾビスイソブチロニトリル０．０５重量部を添加し、６０℃で８時間還流させたこと以外は（メタ）アクリル共重合体（ａ）と同様にして、比（Ｍｗ／Ｍｎ）が１０．５かつＭｗが６５万である（メタ）アクリル共重合体（ｂ）の溶液を得た。(Preparation of (meth) acrylic copolymer (b))
Azobisisobutyronitrile was used as a polymerization initiator by using 58 parts by weight of butyl acrylate, 34 parts by weight of 2-ethylhexyl acrylate, 5 parts by weight of ethyl acrylate, 3 parts by weight of acrylic acid, and 0.1 part by weight of 2-hydroxyethyl acrylate. The ratio (Mw / Mn) was 10.5 and the Mw was 650,000, similarly to the (meth) acrylic copolymer (a) except that 0.05 part by weight was added and refluxed at 60 ° C. for 8 hours. A solution of (meth) acrylic copolymer (b) was obtained.

（（メタ）アクリル共重合体（ｃ）の調製）
ブチルアクリレート７９重量部、２−エチルヘキシルアクリレート１９重量部、アクリル酸３重量部、及び２−ヒドロキシエチルアクリレート０．２重量部を用い、重合開始剤としてアゾビスイソブチロニトリル０．３重量部を添加し、７０℃で５時間還流させたこと以外は（メタ）アクリル共重合体（ａ）と同様にして、比（Ｍｗ／Ｍｎ）が１３．１かつＭｗが６７万である（メタ）アクリル共重合体（ｃ）の溶液を得た。(Preparation of (meth) acrylic copolymer (c))
79 parts by weight of butyl acrylate, 19 parts by weight of 2-ethylhexyl acrylate, 3 parts by weight of acrylic acid, and 0.2 parts by weight of 2-hydroxyethyl acrylate were used, and 0.3 parts by weight of azobisisobutyronitrile was used as a polymerization initiator. (Meth) acrylic having a ratio (Mw / Mn) of 13.1 and Mw of 670,000 in the same manner as (meth) acrylic copolymer (a) except that it was added and refluxed at 70 ° C. for 5 hours. A solution of copolymer (c) was obtained.

（（メタ）アクリル共重合体（ｄ）の調製）
ブチルアクリレート５０重量部、２−エチルヘキシルアクリレート３２重量部、エチルアクリレート１５重量部、アクリル酸３重量部、及び２−ヒドロキシエチルアクリレート０．２重量部を用い、重合開始剤としてアゾビスイソブチロニトリル０．０７重量部を添加し、７０℃で５時間還流させたこと以外は（メタ）アクリル共重合体（ａ）と同様にして、比（Ｍｗ／Ｍｎ）が１１．２かつＭｗが６５万である（メタ）アクリル共重合体（ｄ）の溶液を得た。(Preparation of (meth) acrylic copolymer (d))
50 parts by weight of butyl acrylate, 32 parts by weight of 2-ethylhexyl acrylate, 15 parts by weight of ethyl acrylate, 3 parts by weight of acrylic acid, and 0.2 part by weight of 2-hydroxyethyl acrylate, and azobisisobutyronitrile as a polymerization initiator The ratio (Mw / Mn) was 11.2 and the Mw was 650,000 in the same manner as the (meth) acrylic copolymer (a) except that 0.07 part by weight was added and refluxed at 70 ° C. for 5 hours. A solution of (meth) acrylic copolymer (d) was obtained.

（（メタ）アクリル共重合体（ｅ）の調製）
ブチルアクリレート５０重量部、２−エチルヘキシルアクリレート３２重量部、エチルアクリレート１５重量部、アクリル酸３重量部、及び２−ヒドロキシエチルアクリレート０．２重量部を用い、重合開始剤としてアゾビスイソブチロニトリル０．５重量部を添加し、８０℃で５時間還流させたこと以外は（メタ）アクリル共重合体（ａ）と同様にして、比（Ｍｗ／Ｍｎ）が１５．５かつＭｗが７０万である（メタ）アクリル共重合体（ｅ）の溶液を得た。(Preparation of (meth) acrylic copolymer (e))
50 parts by weight of butyl acrylate, 32 parts by weight of 2-ethylhexyl acrylate, 15 parts by weight of ethyl acrylate, 3 parts by weight of acrylic acid, and 0.2 part by weight of 2-hydroxyethyl acrylate, and azobisisobutyronitrile as a polymerization initiator The ratio (Mw / Mn) was 15.5 and the Mw was 700,000 in the same manner as the (meth) acrylic copolymer (a) except that 0.5 part by weight was added and refluxed at 80 ° C. for 5 hours. A solution of (meth) acrylic copolymer (e) was obtained.

（（メタ）アクリル共重合体（ｆ）の調製）
ブチルアクリレート５０重量部、２−エチルヘキシルアクリレート３２重量部、エチルアクリレート１５重量部、アクリル酸３重量部、及び２−ヒドロキシエチルアクリレート０．２重量部を用い、重合開始剤としてアゾビスイソブチロニトリル０．６重量部を添加し、８０℃で５時間還流させたこと以外は（メタ）アクリル共重合体（ａ）と同様にして、比（Ｍｗ／Ｍｎ）が１６．２かつＭｗが７０万である（メタ）アクリル共重合体（ｆ）の溶液を得た。(Preparation of (meth) acrylic copolymer (f))
50 parts by weight of butyl acrylate, 32 parts by weight of 2-ethylhexyl acrylate, 15 parts by weight of ethyl acrylate, 3 parts by weight of acrylic acid, and 0.2 part by weight of 2-hydroxyethyl acrylate, and azobisisobutyronitrile as a polymerization initiator The ratio (Mw / Mn) was 16.2 and the Mw was 700,000 in the same manner as the (meth) acrylic copolymer (a) except that 0.6 part by weight was added and refluxed at 80 ° C. for 5 hours. A solution of (meth) acrylic copolymer (f) was obtained.

（（メタ）アクリル共重合体（ｇ）の調製）
ブチルアクリレート５０重量部、２−エチルヘキシルアクリレート３２重量部、エチルアクリレート１５重量部、アクリル酸３重量部、及び２−ヒドロキシエチルアクリレート０．２重量部を用い、重合開始剤としてアゾビスイソブチロニトリル０．０３重量部を添加し、６０℃で５時間還流させたこと以外は（メタ）アクリル共重合体（ａ）と同様にして、比（Ｍｗ／Ｍｎ）が５．１かつＭｗが７０万である（メタ）アクリル共重合体（ｇ）の溶液を得た。(Preparation of (meth) acrylic copolymer (g))
50 parts by weight of butyl acrylate, 32 parts by weight of 2-ethylhexyl acrylate, 15 parts by weight of ethyl acrylate, 3 parts by weight of acrylic acid, and 0.2 part by weight of 2-hydroxyethyl acrylate, and azobisisobutyronitrile as a polymerization initiator The ratio (Mw / Mn) was 5.1 and Mw was 700,000 in the same manner as the (meth) acrylic copolymer (a) except that 0.03 part by weight was added and refluxed at 60 ° C. for 5 hours. A solution of (meth) acrylic copolymer (g) was obtained.

（（メタ）アクリル共重合体（ｈ）の調製）
ブチルアクリレート５０重量部、２−エチルヘキシルアクリレート３２重量部、エチルアクリレート１５重量部、アクリル酸３重量部、及び２−ヒドロキシエチルアクリレート０．２重量部を用い、重合開始剤としてアゾビスイソブチロニトリル０．０６重量部を添加し、６０℃で５時間還流させたこと以外は（メタ）アクリル共重合体（ａ）と同様にして、比（Ｍｗ／Ｍｎ）が９．５かつＭｗが７０万である（メタ）アクリル共重合体（ｈ）の溶液を得た。(Preparation of (meth) acrylic copolymer (h))
50 parts by weight of butyl acrylate, 32 parts by weight of 2-ethylhexyl acrylate, 15 parts by weight of ethyl acrylate, 3 parts by weight of acrylic acid, and 0.2 part by weight of 2-hydroxyethyl acrylate, and azobisisobutyronitrile as a polymerization initiator The ratio (Mw / Mn) is 9.5 and the Mw is 700,000 in the same manner as the (meth) acrylic copolymer (a) except that 0.06 part by weight is added and refluxed at 60 ° C. for 5 hours. A solution of (meth) acrylic copolymer (h) was obtained.

（実施例１）
得られた（メタ）アクリル共重合体（ａ）の溶液に含まれる（メタ）アクリル共重合体（ａ）の固形分１００重量部に対して、重合ロジンエステル１２重量部、テルペンフェノール１２重量部、水添ロジンエステル１２重量部、酢酸エチル（不二化学薬品社製）１２５重量部、及びイソシアネート系架橋剤（日本ポリウレタン社製「コロネートＬ４５」）２重量部を添加し、攪拌して、（メタ）アクリル系粘着剤（１）を得た。ここでは、重合ロジンエステル１２重量部、テルペンフェノール１２重量部、水添ロジンエステル１２重量部を用い、粘着付与樹脂を合計で３６重量部用いた。Example 1
12 parts by weight of polymerized rosin ester and 12 parts by weight of terpene phenol with respect to 100 parts by weight of solid content of (meth) acrylic copolymer (a) contained in the solution of the obtained (meth) acrylic copolymer (a) , 12 parts by weight of hydrogenated rosin ester, 125 parts by weight of ethyl acetate (Fuji Chemical Co., Ltd.), and 2 parts by weight of an isocyanate-based crosslinking agent (“Coronate L45” manufactured by Nippon Polyurethane Co., Ltd.) A (meth) acrylic adhesive (1) was obtained. Here, 12 parts by weight of polymerized rosin ester, 12 parts by weight of terpene phenol, and 12 parts by weight of hydrogenated rosin ester were used, and a total of 36 parts by weight of tackifying resin was used.

離型紙（厚み１５０μｍ）を用意した。この離型紙の離型処理面にアクリル系粘着剤（１）を塗布し、１００℃で５分間乾燥させることにより、粘着剤層（厚み７５μｍ）を形成した。この粘着剤層を、架橋メタロセン系ポリエチレン発泡体（発泡基材、厚み１００μｍ、発泡倍率３倍、厚み方向の２５％圧縮強度：８０ｋＰａ）の表面と貼り合わせた。次いで、同様の要領で、この架橋メタロセン系ポリエチレン発泡体の反対の表面にも、上記と同じ粘着剤層を貼り合わせた。これにより、離型紙（厚み１５０μｍ）で両面が覆われた両面粘着テープを得た。  Release paper (thickness 150 μm) was prepared. An acrylic pressure-sensitive adhesive (1) was applied to the release-treated surface of this release paper and dried at 100 ° C. for 5 minutes to form a pressure-sensitive adhesive layer (thickness 75 μm). This pressure-sensitive adhesive layer was bonded to the surface of a crosslinked metallocene polyethylene foam (foam base, thickness 100 μm, expansion ratio 3 times, thickness direction 25% compression strength: 80 kPa). Next, in the same manner, the same pressure-sensitive adhesive layer as above was bonded to the opposite surface of the crosslinked metallocene polyethylene foam. Thereby, a double-sided pressure-sensitive adhesive tape whose both surfaces were covered with a release paper (thickness 150 μm) was obtained.

（実施例２〜５、参考例６，７及び比較例１〜７）
実施例１で用いた発泡基材を用い、（メタ）アクリル共重合体の種類、（メタ）アクリル共重合体１００重量部に対する粘着付与樹脂の配合量、１層あたりの粘着剤層の厚みを、下記の表１に示すように設定したこと以外は実施例１と同様にして、両面粘着テープを得た。 (Examples 2 to 5, Reference Examples 6 and 7 and Comparative Examples 1 to 7 )
Using the foamed base material used in Example 1, the type of (meth) acrylic copolymer, the blending amount of tackifying resin relative to 100 parts by weight of (meth) acrylic copolymer, and the thickness of the pressure-sensitive adhesive layer per layer A double-sided pressure-sensitive adhesive tape was obtained in the same manner as in Example 1 except that the settings were made as shown in Table 1 below.

なお、粘着付与樹脂に関しては、重合ロジンエステルとテルペンフェノールと水添ロジンエステルとの重量比が１：１：１になるように、下記の表１に示す配合量で用いた。  In addition, regarding tackifying resin, it used by the compounding quantity shown in following Table 1 so that the weight ratio of superposition | polymerization rosin ester, terpene phenol, and hydrogenated rosin ester might become 1: 1: 1.

（評価）
（１）粘着剤層のゲル分率
粘着剤層をＷ１（ｇ）採取し、採取した粘着剤層を酢酸エチル中に２３℃にて２４時間浸漬した際の不溶解分を２００メッシュの金網で濾過する。この金網上の残渣を１１０℃にて加熱乾燥し、得られた乾燥残渣の重量Ｗ２（ｇ）を測定し、下記式（１）によりゲル分率（架橋度）を算出する。(Evaluation)
(1) Gel fraction of the pressure-sensitive adhesive layer W1 (g) was collected from the pressure-sensitive adhesive layer, and the insoluble content when the collected pressure-sensitive adhesive layer was immersed in ethyl acetate at 23 ° C. for 24 hours using a 200-mesh wire mesh Filter. The residue on the wire net is heated and dried at 110 ° C., the weight W2 (g) of the obtained dry residue is measured, and the gel fraction (crosslinking degree) is calculated by the following formula (1).

ゲル分率（重量％）＝１００×Ｗ２／Ｗ１ （１）  Gel fraction (% by weight) = 100 × W2 / W1 (1)

（２）加圧試験（防水性及び接着性の評価、特に防水性の評価）
図１（ａ）及び（ｂ）に示す状態で、加圧試験を行った。(2) Pressure test (evaluation of waterproofness and adhesiveness, especially waterproofness)
A pressure test was performed in the state shown in FIGS. 1 (a) and 1 (b).

得られた両面粘着テープを、長さ６１ｍｍ及び幅４９ｍｍの長方形の外形を有し、長さ５７ｍｍ及び幅４５ｍｍの長方形の内形を有し、かつ２ｍｍの幅を有するように切断して、枠状の両面粘着テープ１（試験片）を得た。  The obtained double-sided adhesive tape has a rectangular outer shape with a length of 61 mm and a width of 49 mm, a rectangular inner shape with a length of 57 mm and a width of 45 mm, and a width of 2 mm, and is cut into a frame. A double-sided pressure-sensitive adhesive tape 1 (test piece) was obtained.

また、長さ１００ｍｍ、幅１００ｍｍ及び厚み１０ｍｍの長方形を有し、かつ貫通孔２ａを有する第１のアクリル板２（三菱レイヨン社製「アクリライト＠Ｌ」に貫通孔を形成した板）を用意した。貫通孔２ａは、直径１ｃｍの円形である。貫通孔２ａは、第１のアクリル板２の中心部に設けた。さらに、長さ１００ｍｍ、幅１００ｍｍ及び厚み１０ｍｍの矩形を有し、かつ貫通孔を有さない第２のアクリル板３（三菱レイヨン社製「アクリライト＠Ｌ）を用意した。  Also, a first acrylic plate 2 (a plate having through holes formed in “Acrylite @ L” manufactured by Mitsubishi Rayon Co., Ltd.) having a rectangular shape with a length of 100 mm, a width of 100 mm, and a thickness of 10 mm and having a through hole 2a is prepared. did. The through hole 2a is a circle having a diameter of 1 cm. The through hole 2 a was provided at the center of the first acrylic plate 2. Furthermore, the 2nd acrylic board 3 ("Acrylite @ L" by Mitsubishi Rayon Co., Ltd.) which has a rectangle of length 100mm, width 100mm, and thickness 10mm, and does not have a through-hole was prepared.

枠状の両面粘着テープ１の一方の離型紙を剥離して、一方の粘着剤層を露出させ、第１のアクリル板２に中心部が揃うように貼り合わせた。枠状の両面粘着テープ１の他方の離型紙を剥離して、他方の粘着剤層を露出させ、第２のアクリル板３に中心部が揃うように貼り合わせた。  One release paper of the frame-shaped double-sided pressure-sensitive adhesive tape 1 was peeled off, and one pressure-sensitive adhesive layer was exposed, and bonded to the first acrylic plate 2 so that the center portion was aligned. The other release paper of the frame-shaped double-sided pressure-sensitive adhesive tape 1 was peeled off to expose the other pressure-sensitive adhesive layer, and bonded to the second acrylic plate 3 so that the center portion was aligned.

第１のアクリル板２と第２のアクリル板３とを枠状の両面粘着テープ１を介して積層して、荷重５ｋｇの力で１０秒間に押圧して貼り合わせた。第１のアクリル板２と第２のアクリル板３と枠状の両面粘着テープ１とで囲まれた内部空間１１Ａを有する積層体１１を得た。得られた積層体１１を２３℃で１日間放置した。この積層体１１を用いて、加圧試験（防水試験）を行った。  The 1st acrylic board 2 and the 2nd acrylic board 3 were laminated | stacked via the frame-shaped double-sided adhesive tape 1, and it pressed together for 10 second with the force of 5 kg of loads, and bonded together. A laminate 11 having an internal space 11A surrounded by the first acrylic plate 2, the second acrylic plate 3, and the frame-like double-sided adhesive tape 1 was obtained. The obtained laminate 11 was left at 23 ° C. for 1 day. Using this laminate 11, a pressure test (waterproof test) was performed.

具体的には、積層体１１における第１のアクリル板２の貫通孔２ａから積層体１１の内部空間１１Ａに空気を入れ、内部空間１１Ａの内圧を３０ｋＰａにする加圧試験を行った。加圧試験時には、枠状の両面粘着テープ１と第１のアクリル板２との接着界面、並びに枠状の両面粘着テープ１と第２のアクリル板３との接着界面を、水中に配置した。第１のアクリル板２の貫通孔２ａは、水面上に配置した。また、積層体１１の主面が水平状態になるように、第１，第２のアクリル板２，３の主面が水平状態になるように、積層体１１を配置した。  Specifically, a pressure test was performed in which air was introduced into the internal space 11A of the multilayer body 11 from the through hole 2a of the first acrylic plate 2 in the multilayer body 11, and the internal pressure of the internal space 11A was set to 30 kPa. During the pressure test, the adhesive interface between the frame-shaped double-sided pressure-sensitive adhesive tape 1 and the first acrylic plate 2 and the adhesive interface between the frame-shaped double-sided pressure-sensitive adhesive tape 1 and the second acrylic plate 3 were placed in water. The through hole 2a of the first acrylic plate 2 was disposed on the water surface. Moreover, the laminated body 11 was arrange | positioned so that the main surface of the 1st, 2nd acrylic plates 2 and 3 might become a horizontal state so that the main surface of the laminated body 11 might become a horizontal state.

第１のアクリル板２の貫通孔２ａから、積層体１１の内部空間１１Ａに空気を圧入し、内部空間１１Ａの内圧を３０ｋＰａとした。この状態を維持して、接着界面からの空気が漏れ出すまでの時間を確認した。枠状の両面粘着テープ１と第１のアクリル板２及び第２のアクリル板３との少なくとも一方の界面で剥離が生じた場合には、接着界面から空気が漏れ出し、積層体１１の内部空間１１Ａの内圧が減少した。接着界面から空気が漏れ出すと、水中に気泡が確認された。  Air was pressed into the internal space 11A of the multilayer body 11 from the through hole 2a of the first acrylic plate 2, and the internal pressure of the internal space 11A was set to 30 kPa. This state was maintained, and the time until the air leaked from the adhesion interface was confirmed. When peeling occurs at least one interface between the frame-shaped double-sided pressure-sensitive adhesive tape 1 and the first acrylic plate 2 and the second acrylic plate 3, air leaks from the adhesive interface, and the internal space of the laminate 11. The internal pressure of 11A decreased. When air leaked from the bonding interface, bubbles were observed in the water.

枠状の両面粘着テープ１と第１のアクリル板２及び第２のアクリル板３との少なくとも一方の界面で剥離が生じることによって、積層体１１の内部空間１１Ａの内圧が減少し始めるまでの時間（内圧減少開始時間）を評価した。  Time until the internal pressure of the internal space 11A of the laminate 11 starts to decrease due to peeling at the interface of at least one of the frame-shaped double-sided adhesive tape 1 and the first acrylic plate 2 and the second acrylic plate 3 (Internal pressure decrease start time) was evaluated.

（３）耐反発性試験（接着性の評価）
図２に示す状態で、耐反発性試験を行った。(3) Resilience test (adhesion evaluation)
In the state shown in FIG. 2, a repulsion resistance test was performed.

両面粘着テープ２１を幅２５ｍｍ、長さ１５０ｍｍに切断した。両面粘着テープ２１の一方の離型紙を剥離し、一方の粘着剤層を露出させた。また、幅２５ｍｍ、長さ１５０ｍｍ及び厚さ１ｍｍの第１のポリカーボネート板２２を用意した。両面粘着テープ２１の露出した面を貼り合わせた。  The double-sided adhesive tape 21 was cut into a width of 25 mm and a length of 150 mm. One release paper of the double-sided pressure-sensitive adhesive tape 21 was peeled off to expose one pressure-sensitive adhesive layer. Moreover, the 1st polycarbonate board 22 of width 25mm, length 150mm, and thickness 1mm was prepared. The exposed surfaces of the double-sided adhesive tape 21 were bonded together.

さらに、両面粘着テープ２１の他方の離型紙を剥離し、他方の粘着剤層を露出させた。また、幅２５ｍｍ、長さ２００ｍｍ及び厚さ１ｍｍの第２のポリカーボネート板２３を用意した。この第２のポリカーボネート板２３の長さ方向の中心部に、両面粘着テープ２１の露出した面を貼り合わせた。２枚の第１，第２のポリカーボネート板２２，２３の間に、両面粘着テープ２１が挟まれた積層サンプルを得た。その後、積層サンプルの第１のポリカーボネート板２２上に２．０ｋｇのゴムローラを載せて、３００ｍｍ／分の速度でゴムローラを一往復させることにより、第１，第２のポリカーボネート板２２，２３を両面粘着テープ２１を介して貼り合わせて、積層体３１を得た。その後、積層体３１を、２３℃で２４時間放置した。放置後の積層体３１を第２のポリカーボネート板２３が下側、第１のポリカーボネート板２２が上側となるように、幅２００ｍｍ、長さ１９０ｍｍ及び厚さ１０ｍｍのアルミニウム製の支持台２４の上に載せた。積層体３１が上側に突出して湾曲した形状となるように、積層体３１における第２のポリカーボネート板２３の両端を、支持台２４の長さ方向の両端に固定した。固定時の第２のポリカーボネート板２３の両端の間隔は１９０ｍｍに設定した。この固定状態で、以下の試験条件で冷熱サイクル試験を行った。  Furthermore, the other release paper of the double-sided pressure-sensitive adhesive tape 21 was peeled off to expose the other pressure-sensitive adhesive layer. Moreover, the 2nd polycarbonate board 23 of width 25mm, length 200mm, and thickness 1mm was prepared. The exposed surface of the double-sided pressure-sensitive adhesive tape 21 was bonded to the center portion of the length direction of the second polycarbonate plate 23. A laminated sample in which the double-sided adhesive tape 21 was sandwiched between the two first and second polycarbonate plates 22 and 23 was obtained. Thereafter, a 2.0 kg rubber roller is placed on the first polycarbonate plate 22 of the laminated sample, and the rubber roller is reciprocated once at a speed of 300 mm / min, whereby the first and second polycarbonate plates 22 and 23 are adhered to both sides. The laminated body 31 was obtained by bonding through the tape 21. Thereafter, the laminate 31 was left at 23 ° C. for 24 hours. The laminated body 31 after being left is placed on an aluminum support 24 having a width of 200 mm, a length of 190 mm and a thickness of 10 mm so that the second polycarbonate plate 23 is on the lower side and the first polycarbonate plate 22 is on the upper side. I put it. Both ends of the second polycarbonate plate 23 in the laminate 31 are fixed to both ends in the length direction of the support base 24 so that the laminate 31 protrudes upward and has a curved shape. The distance between both ends of the second polycarbonate plate 23 when fixed was set to 190 mm. In this fixed state, a thermal cycle test was performed under the following test conditions.

（試験条件）
温度条件：−４０℃〜９０℃、昇温速度：−４０℃〜９０℃まで３０分、降温速度：９０℃〜−４０℃まで３０分、相対湿度：６５％ＲＨ、冷熱サイクル：３０回(Test conditions)
Temperature conditions: −40 ° C. to 90 ° C., heating rate: −40 ° C. to 90 ° C. for 30 minutes, cooling rate: 90 ° C. to −40 ° C. for 30 minutes, relative humidity: 65% RH, cooling cycle: 30 times

上記冷熱サイクル試験を経た後、積層体を観察し、上側の第１のポリカーボネート板の端部が下側の第２のポリカーボネート板から、剥がれて浮いているか否かを観察した。  After passing through the cooling cycle test, the laminate was observed, and it was observed whether or not the end portion of the upper first polycarbonate plate was peeled off and floated from the lower second polycarbonate plate.

［耐反発性試験の判定基準］
○：上側の第１のポリカーボネート板の端部が下側の第２のポリカーボネート板から剥がれておらず、浮いていない
×：上側の第１のポリカーボネート板の端部が下側の第２のポリカーボネート板から剥がれて浮いている[Judgment criteria for rebound resistance test]
◯: The end portion of the upper first polycarbonate plate is not peeled off from the lower second polycarbonate plate, and is not floated. X: The end portion of the upper first polycarbonate plate is the lower second polycarbonate. Floating off the board

詳細及び結果を下記の表１に示す。  Details and results are shown in Table 1 below.

Figure 0006470684
Figure 0006470684

１…枠状の両面粘着テープ
２…第１のアクリル板
２ａ…貫通孔
３…第２のアクリル板
１１…積層体
１１Ａ…内部空間
２１…両面粘着テープ
２２…第１のポリカーボネート板
２３…第２のポリカーボネート板
２４…支持台
３１…積層体DESCRIPTION OF SYMBOLS 1 ... Frame-shaped double-sided adhesive tape 2 ... 1st acrylic board 2a ... Through-hole 3 ... 2nd acrylic board 11 ... Laminated body 11A ... Internal space 21 ... Double-sided adhesive tape 22 ... 1st polycarbonate board 23 ... 2nd Polycarbonate plate 24 ... support 31 ... laminate

Claims (5)

ポリオレフィン系樹脂により形成されている発泡基材と、
前記発泡基材の第１の表面側に配置されており、かつ、（メタ）アクリル系粘着剤により形成されている第１の粘着剤層と、
前記発泡基材の前記第１の表面側とは反対の第２の表面側に配置されており、かつ、（メタ）アクリル系粘着剤により形成されている第２の粘着剤層とを備え、
前記第１の粘着剤層に含まれる前記（メタ）アクリル系粘着剤が、（メタ）アクリル重合体と粘着付与樹脂を含み、前記第１の粘着剤層において、前記（メタ）アクリル重合体１００重量部に対する前記粘着付与樹脂の含有量が３６重量部以上、５０重量部以下であり、
前記第２の粘着剤層に含まれる前記（メタ）アクリル系粘着剤が、（メタ）アクリル重合体と粘着付与樹脂を含み、前記第２の粘着剤層において、前記（メタ）アクリル重合体１００重量部に対する前記粘着付与樹脂の含有量が３６重量部以上、５０重量部以下であり、
前記第１の粘着剤層に含まれる前記（メタ）アクリル系粘着剤が、重量平均分子量の数平均分子量に対する比が１０以上、１５以下である（メタ）アクリル重合体を含み、
前記第２の粘着剤層に含まれる前記（メタ）アクリル系粘着剤が、重量平均分子量の数平均分子量に対する比が１０以上、１５以下である（メタ）アクリル重合体を含み、
長さ６１ｍｍ及び幅４９ｍｍの矩形の外形を有し、長さ５７ｍｍ及び幅４５ｍｍの矩形の内形を有し、かつ２ｍｍの幅を有する枠状の両面粘着テープを用意し、長さ１００ｍｍ、幅１００ｍｍ及び厚み１０ｍｍの矩形を有し、かつ貫通孔を有する第１のアクリル板を用意し、長さ１００ｍｍ、幅１００ｍｍ及び厚み１０ｍｍの矩形を有し、かつ貫通孔を有さない第２のアクリル板を用意して、前記第１のアクリル板と前記第２のアクリル板とを前記枠状の両面粘着テープを介して貼り合わせて、前記第１のアクリル板と前記第２のアクリル板と前記枠状の両面粘着テープとで囲まれた内部空間を有する積層体を得て、前記積層体における前記第１のアクリル板の貫通孔から前記積層体の前記内部空間に空気を入れ、前記内部空間の内圧を３０ｋＰａにする加圧試験を行ったときに、
前記枠状の両面粘着テープと前記第１のアクリル板及び前記第２のアクリル板との少なくとも一方の界面で剥離が生じることによって、前記積層体の前記内部空間の内圧が減少し始めるまでの時間が５０分以上である、両面粘着テープ。 A foam base formed of a polyolefin-based resin;
A first pressure-sensitive adhesive layer disposed on the first surface side of the foamed base material and formed of a (meth) acrylic pressure-sensitive adhesive; and
A second pressure-sensitive adhesive layer which is disposed on the second surface side opposite to the first surface side of the foamed base material and is formed of a (meth) acrylic pressure-sensitive adhesive,
The (meth) acrylic pressure-sensitive adhesive contained in the first pressure-sensitive adhesive layer contains a (meth) acrylic polymer and a tackifier resin, and the (meth) acrylic polymer 100 in the first pressure-sensitive adhesive layer. The content of the tackifying resin relative to parts by weight is 36 parts by weight or more and 50 parts by weight or less,
The (meth) acrylic pressure-sensitive adhesive contained in the second pressure-sensitive adhesive layer contains a (meth) acrylic polymer and a tackifier resin, and the (meth) acrylic polymer 100 in the second pressure-sensitive adhesive layer. The content of the tackifying resin relative to parts by weight is 36 parts by weight or more and 50 parts by weight or less,
The (meth) acrylic pressure-sensitive adhesive contained in the first pressure-sensitive adhesive layer contains a (meth) acrylic polymer having a ratio of the weight average molecular weight to the number average molecular weight of 10 or more and 15 or less,
The (meth) acrylic pressure-sensitive adhesive contained in the second pressure-sensitive adhesive layer contains a (meth) acrylic polymer having a ratio of the weight average molecular weight to the number average molecular weight of 10 or more and 15 or less,
Prepare a frame-shaped double-sided adhesive tape with a rectangular outer shape with a length of 61 mm and a width of 49 mm, a rectangular inner shape with a length of 57 mm and a width of 45 mm, and a width of 2 mm, a length of 100 mm, a width A first acrylic plate having a rectangle of 100 mm and a thickness of 10 mm and having a through hole is prepared. A second acrylic plate having a length of 100 mm, a width of 100 mm and a thickness of 10 mm and having no through hole is prepared. A plate is prepared, and the first acrylic plate and the second acrylic plate are bonded together via the frame-shaped double-sided adhesive tape, and the first acrylic plate, the second acrylic plate, and the A laminated body having an internal space surrounded by a frame-shaped double-sided adhesive tape is obtained, and air is introduced into the internal space of the laminated body from a through-hole of the first acrylic plate in the laminated body. The internal pressure of 30 When subjected to pressure test to Pa,
Time until the internal pressure of the internal space of the laminate starts to decrease due to peeling at the interface between at least one of the frame-shaped double-sided pressure-sensitive adhesive tape and the first acrylic plate and the second acrylic plate. Double-sided pressure-sensitive adhesive tape having a duration of 50 minutes or longer. 前記第１の粘着剤層に含まれる前記（メタ）アクリル系粘着剤が、（メタ）アクリル重合体と粘着付与樹脂を含み、前記第１の粘着剤層において、前記（メタ）アクリル重合体１００重量部に対する前記粘着付与樹脂の含有量が４０重量部以上、５０重量部以下であり、
前記第２の粘着剤層に含まれる前記（メタ）アクリル系粘着剤が、（メタ）アクリル重合体と粘着付与樹脂を含み、前記第２の粘着剤層において、前記（メタ）アクリル重合体１００重量部に対する前記粘着付与樹脂の含有量が４０重量部以上、５０重量部以下である、請求項１に記載の両面粘着テープ。 The (meth) acrylic pressure-sensitive adhesive contained in the first pressure-sensitive adhesive layer contains a (meth) acrylic polymer and a tackifier resin, and the (meth) acrylic polymer 100 in the first pressure-sensitive adhesive layer. The content of the tackifying resin relative to parts by weight is 40 parts by weight or more and 50 parts by weight or less,
The (meth) acrylic pressure-sensitive adhesive contained in the second pressure-sensitive adhesive layer contains a (meth) acrylic polymer and a tackifier resin, and the (meth) acrylic polymer 100 in the second pressure-sensitive adhesive layer. The double-sided pressure-sensitive adhesive tape according to claim 1, wherein the content of the tackifying resin relative to parts by weight is 40 parts by weight or more and 50 parts by weight or less. 前記第１の粘着剤層のゲル分率が１５重量％以上、５０重量％以下であり、
前記第２の粘着剤層のゲル分率が１５重量％以上、５０重量％以下である、請求項１又は２に記載の両面粘着テープ。 The gel fraction of the first pressure-sensitive adhesive layer is 15% by weight or more and 50% by weight or less,
The double-sided pressure-sensitive adhesive tape according to claim 1 or 2 , wherein the gel fraction of the second pressure-sensitive adhesive layer is 15% by weight or more and 50% by weight or less. 前記発泡基材が、前記ポリオレフィン系樹脂を架橋及び発泡させることにより得られる、請求項１〜３のいずれか１項に記載の両面粘着テープ。 The double-sided pressure-sensitive adhesive tape according to any one of claims 1 to 3 , wherein the foam base is obtained by crosslinking and foaming the polyolefin resin. 前記第１の粘着剤層の厚みが２５μｍ以上、１００μｍ以下であり、
前記第２の粘着剤層の厚みが２５μｍ以上、１００μｍ以下である、請求項１〜４のいずれか１項に記載の両面粘着テープ。 The thickness of the first pressure-sensitive adhesive layer is 25 μm or more and 100 μm or less,
The double-sided pressure-sensitive adhesive tape according to any one of claims 1 to 4 , wherein a thickness of the second pressure-sensitive adhesive layer is 25 µm or more and 100 µm or less.
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