JP2012072299A - Double-sided adhesive tape and display device with touch panel - Google Patents
Double-sided adhesive tape and display device with touch panel Download PDFInfo
- Publication number
- JP2012072299A JP2012072299A JP2010218794A JP2010218794A JP2012072299A JP 2012072299 A JP2012072299 A JP 2012072299A JP 2010218794 A JP2010218794 A JP 2010218794A JP 2010218794 A JP2010218794 A JP 2010218794A JP 2012072299 A JP2012072299 A JP 2012072299A
- Authority
- JP
- Japan
- Prior art keywords
- sensitive adhesive
- double
- adhesive tape
- pressure
- sided pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- 239000011162 core material Substances 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 34
- 238000005452 bending Methods 0.000 claims abstract description 15
- 238000003860 storage Methods 0.000 claims abstract description 15
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- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
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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
- C09J7/30—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
-
- 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
- C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/241—Polyolefin, e.g.rubber
-
- 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
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
-
- 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
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
-
- 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
- C09J2423/00—Presence of polyolefin
- C09J2423/04—Presence of homo or copolymers of ethene
- C09J2423/046—Presence of homo or copolymers of ethene 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
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Organic Chemistry (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Sealing Material Composition (AREA)
Abstract
Description
本発明は、両面粘着テープ及びタッチパネル付き表示装置に関する。さらに詳しくは、本発明は、特定の性状を有する芯材の両面に粘着剤層が設けられてなる積層体であって、例えば携帯電話やタッチパネルなどのモバイル製品における部材固定用などとして好適な、段差への貼合適性及び耐水性に優れ、表示画面の周囲に設ける額縁の幅の狭い携帯情報端末に防水用などとして用いられる凹凸追従性を有する両面粘着テープ、及び該両面粘着テープを用いてなるタッチパネル付き表示装置に関するものである。 The present invention relates to a double-sided adhesive tape and a display device with a touch panel. More specifically, the present invention is a laminate in which a pressure-sensitive adhesive layer is provided on both surfaces of a core material having a specific property, and is suitable for fixing a member in a mobile product such as a mobile phone or a touch panel. Using double-sided pressure-sensitive adhesive tape that has excellent conformability and water resistance to a step, and has a concave-convex follow-up property that is used for waterproofing in a portable information terminal having a narrow frame width provided around a display screen, and the double-sided pressure-sensitive adhesive tape The present invention relates to a display device with a touch panel.
携帯電話やタッチパネルなどのモバイル製品は、環境を選ばずに使用される機器であり、最近では様々な場面にモバイル製品を適用する傾向にある。特に、海岸や浴室などの水場での使用が増えており、それに伴う故障も増加している。
この対策として、例えば特許文献１に、発泡体基材と粘着剤層とを有する両面粘着テープであって、前記発泡体基材の２５％圧縮強度が４０〜１６０ｋＰａ、引張り強度が３００〜１５００Ｎ／ｃｍ2であることを特徴とする防水用両面粘着テープが開示されており、そしてこの技術においては、基材が発泡していることにより、基材と粘着剤が界面で強固に接合している。また、前述の発泡体基材は独立発泡構造をとっているため、両面粘着テープの一方の面が水に濡れても他方の面まで浸透することがなく、防水性を発揮している。さらに発泡体基材は凹凸追従性に優れる。
しかしながら、１ｍｍ程度の非常に狭いテープ幅の場合、発泡体を使用した防水用両面粘着テープでは、水の浸透を制御する独立気泡の泡壁を幅方向に対して十分に確保できない恐れがあり、十分な防水性は達成されない。また発泡形状の大きさには限界があり、その大きさを細かく制御することが困難である。
近年の携帯電話ではデザイン性ならびに機能面の要求から表示画面が大きいものが増えてきており、それに伴い、表示画面の周囲の枠部分ができるだけ狭くなるように設計されている。これらに用いられる両面粘着テープは２ｍｍ幅以下の狭額縁状形態で使用することが想定されるが、２ｍｍ以下の非常に狭いテープ幅の場合、前述で説明したような発泡体を使用した防水用両面粘着テープでは、水の浸透を制御する独立気泡の泡壁を幅方向に対して充分に確保できない恐れがあり、充分な防水性は達成されないという問題がある。
Mobile products such as mobile phones and touch panels are devices that are used regardless of the environment, and recently, mobile products tend to be applied to various situations. In particular, use in water fields such as beaches and bathrooms is increasing, and the number of failures associated therewith is also increasing.
For example, Patent Document 1 discloses a double-sided pressure-sensitive adhesive tape having a foam base material and a pressure-sensitive adhesive layer, wherein the foam base material has a 25% compressive strength of 40 to 160 kPa and a tensile strength of 300 to 1500 N / A waterproof double-sided pressure-sensitive adhesive tape characterized by being cm 2 is disclosed, and in this technique, the base material and the adhesive are firmly bonded at the interface because the base material is foamed. . Moreover, since the above-mentioned foam base material has an independent foam structure, even if one surface of the double-sided pressure-sensitive adhesive tape gets wet with water, it does not penetrate to the other surface and exhibits waterproofness. Furthermore, the foam base material is excellent in uneven followability.
However, in the case of a very narrow tape width of about 1 mm, the waterproof double-sided pressure-sensitive adhesive tape using a foam may not be able to sufficiently secure a bubble wall of closed cells for controlling water penetration in the width direction. Sufficient waterproofness is not achieved. In addition, there is a limit to the size of the foam shape, and it is difficult to finely control the size.
In recent years, mobile phones with a large display screen have been increasing due to demands on design and functionality, and accordingly, the frame portion around the display screen is designed to be as narrow as possible. The double-sided pressure-sensitive adhesive tape used for these is assumed to be used in a narrow frame shape with a width of 2 mm or less, but for a very narrow tape width of 2 mm or less, for waterproofing using a foam as described above In the double-sided pressure-sensitive adhesive tape, there is a possibility that the bubble wall of closed cells for controlling the penetration of water cannot be sufficiently secured in the width direction, and there is a problem that sufficient waterproofness is not achieved.
本発明は、このような状況下になされたもので、芯材の両面に粘着剤層が設けられてなる積層体であって、例えば携帯電話やタッチパネルなどのモバイル製品における部材固定用などとして好適な、段差への貼合適性及び耐水性に優れ、額縁の幅の狭い携帯情報端末に防水用などとして用いられる凹凸追従性を有する両面粘着テープを提供することを目的とするものである。 The present invention has been made under such circumstances, and is a laminate in which an adhesive layer is provided on both surfaces of a core material, and is suitable for fixing members in mobile products such as mobile phones and touch panels. Another object of the present invention is to provide a double-sided pressure-sensitive adhesive tape that has excellent conformability to a step and water resistance, and has an uneven follow-up property that is used for waterproofing and the like in a portable information terminal having a narrow frame width.
本発明者らは、前記目的を達成するために鋭意研究を重ねた結果、下記の知見を得た。
芯材として、特定の性状を有する合成樹脂フィルム、好ましくはエチレン−メタクリル酸共重合体や、エチレン−酢酸ビニル共重合体などのオレフィン系重合体を用いて形成されたフィルムを使用し、その両面に特定の性状を有する粘着剤層、好ましくはアクリル系粘着剤層を設けてなる積層体であって、該積層体の０℃における貯蔵弾性率が特定の範囲にある両面粘着テープにより、その目的を達成し得ることを見出した。
本発明は、かかる知見に基づいて完成したものである。
As a result of intensive studies to achieve the above object, the present inventors have obtained the following knowledge.
As a core material, a synthetic resin film having specific properties, preferably a film formed using an olefin polymer such as an ethylene-methacrylic acid copolymer or an ethylene-vinyl acetate copolymer, both surfaces thereof are used. And a pressure-sensitive adhesive layer having a specific property, preferably an acrylic pressure-sensitive adhesive layer, wherein the laminate has a storage elastic modulus at 0 ° C. in a specific range. Found that it can be achieved.
The present invention has been completed based on such findings.
すなわち、本発明は、
［１］芯材と、その両面に設けられた粘着剤層とを有する積層体からなる両面粘着テープであって、
（ａ）前記積層体の０℃における貯蔵弾性率が０.６〜３.７ＭＰａであること、
（ｂ）前記２つの粘着剤層の２３℃におけるｔａｎδ（損失正接）が、それぞれ０.６以上であること、
（ｃ）前記芯材の５％引張り応力が３〜１００Ｎであり、かつ剛軟度（ガーレ法）が０.２ｍＮ以下であること、
を特徴とする両面粘着テープ、
［２］芯材が、厚さ３〜２００μｍの合成樹脂フィルムであり、かつ２つの粘着剤層の厚さが、それぞれ２０〜１００μｍである、上記[１]項に記載の両面粘着テープ、
［３］２つの粘着剤層を構成する粘着剤が、それぞれアクリル系粘着剤である、上記[１]又は[２]項に記載の両面粘着テープ、
［４］芯材が、オレフィン系重合体フィルムである、上記[２]又は[３]項に記載の両面粘着テープ、
［５］オレフィン系重合体フィルムが、エチレン−メタクリル酸共重合体及び／又はエチレン−酢酸ビニル共重合体及び／又はポリエチレンを用いて形成されたフィルムである、上記[４]項に記載の両面粘着テープ、
［６］０.１〜２ｍｍ幅の額縁状に打ち抜かれてなる形態を有する、上記[１]〜[５]項のいずれかに記載の両面粘着テープ、
［７］携帯情報端末機器内部の固定用として用いられる、上記[１]〜[６]項のいずれかに記載の両面粘着テープ、
［８］防水用として用いられる、上記[１]〜[７]項のいずれかに記載の両面粘着テープ、及び
［９］上記[１]〜[８]項のいずれかに記載の両面粘着テープにより、筐体が固定されてなることを特徴とするタッチパネル付き表示装置、
を提供するものである。
That is, the present invention
[1] A double-sided pressure-sensitive adhesive tape comprising a laminate having a core material and pressure-sensitive adhesive layers provided on both sides thereof,
(A) The storage elastic modulus at 0 ° C. of the laminate is 0.6 to 3.7 MPa,
(B) tan δ (loss tangent) at 23 ° C. of the two pressure-sensitive adhesive layers is 0.6 or more,
(C) The core material has a 5% tensile stress of 3 to 100 N and a bending resistance (Gurley method) of 0.2 mN or less.
Double-sided adhesive tape, characterized by
[2] The double-sided pressure-sensitive adhesive tape according to item [1], wherein the core is a synthetic resin film having a thickness of 3 to 200 μm, and the thickness of the two pressure-sensitive adhesive layers is 20 to 100 μm, respectively.
[3] The double-sided pressure-sensitive adhesive tape according to the above item [1] or [2], wherein the pressure-sensitive adhesives constituting the two pressure-sensitive adhesive layers are each an acrylic pressure-sensitive adhesive.
[4] The double-sided pressure-sensitive adhesive tape according to the above [2] or [3], wherein the core material is an olefin polymer film,
[5] Both sides according to [4] above, wherein the olefin polymer film is a film formed using an ethylene-methacrylic acid copolymer and / or an ethylene-vinyl acetate copolymer and / or polyethylene. Adhesive tape,
[6] The double-sided pressure-sensitive adhesive tape according to any one of the above [1] to [5], having a form punched into a frame shape having a width of 0.1 to 2 mm,
[7] The double-sided pressure-sensitive adhesive tape according to any one of [1] to [6], which is used for fixing inside a portable information terminal device,
[8] The double-sided pressure-sensitive adhesive tape according to any one of [1] to [7], and [9] the double-sided pressure-sensitive adhesive tape according to any one of [1] to [8], which is used for waterproofing. A display device with a touch panel, characterized in that the housing is fixed,
Is to provide.
本発明によれば、芯材の両面に粘着剤層が設けられてなる積層体であって、例えば携帯電話やタッチパネルなどのモバイル製品における部材固定用などとして好適な、段差への貼合適性及び耐水性に優れ、額縁の幅の狭い携帯情報端末に防水用などとして用いられる凹凸追従性を有する両面粘着テープ、及び該両面粘着テープを用いてなるタッチパネル付き表示装置を提供することができる。 According to the present invention, it is a laminate in which an adhesive layer is provided on both surfaces of a core material, and is suitable for fixing a member in a mobile product such as a mobile phone or a touch panel. It is possible to provide a double-sided pressure-sensitive adhesive tape having an uneven follow-up property that is excellent in water resistance and used for waterproofing in a portable information terminal with a narrow frame width, and a display device with a touch panel using the double-sided pressure-sensitive adhesive tape.
まず、本発明の両面粘着テープについて説明する。
［両面粘着テープ］
本発明の両面粘着テープは、芯材と、その両面に設けられた粘着剤層とを有する積層体であって、
（ａ）前記積層体の０℃における貯蔵弾性率が０.６〜３.７ＭＰａであること、
（ｂ）前記２つの粘着剤層の２３℃におけるｔａｎδ（損失正接）が、それぞれ０.６以上であること、
（ｃ）前記芯材の５％引張り応力が３〜１００Ｎであり、かつ剛軟度（ガーレ法）が０.２ｍＮ以下であること、
を特徴とする。
First, the double-sided pressure-sensitive adhesive tape of the present invention will be described.
[Double-sided adhesive tape]
The double-sided pressure-sensitive adhesive tape of the present invention is a laminate having a core material and a pressure-sensitive adhesive layer provided on both surfaces thereof,
(A) The storage elastic modulus at 0 ° C. of the laminate is 0.6 to 3.7 MPa,
(B) tan δ (loss tangent) at 23 ° C. of the two pressure-sensitive adhesive layers is 0.6 or more,
(C) The core material has a 5% tensile stress of 3 to 100 N and a bending resistance (Gurley method) of 0.2 mN or less.
It is characterized by.
（芯材）
本発明の両面粘着テープにおいて、積層体を構成する芯材は、５％引張り応力が３〜１００Ｎの範囲にあり、かつ剛軟度（ガーレ法）が０.２ｍＮ以下であることを要する。前記引張り応力が３Ｎ未満では加工性が低下し、一方１００Ｎを超えると凹凸面貼付性が低下して耐水性が不充分となる。該引張り応力は、好ましくは３〜５０Ｎ、より好ましくは５〜２０Ｎの範囲である。
また、剛軟度（ガーレ法）は０.２ｍＮ以下であることを要する。この剛軟度が０.２ｍＮを超えると面接合力が低下する。面接合力の観点から、該剛軟度は０.１５ｍＮ以下が好ましく、０.１ｍＮ以下がより好ましい。この剛軟度の下限については特に制限はないが、通常０.０１ｍＮ程度である。
さらに、当該芯材は、厚さが２〜４００μｍの合成樹脂フィルムであることが好ましく、１０〜２００μｍのフィルムであることがより好ましく、５０〜１５０μｍのフィルムであることがさらに好ましい。
当該芯材フィルムの厚さが２μｍ未満では、芯材自体の加工性、両面粘着テープの裁断加工適性、打ち抜き加工適性及び強度が十分に得られない。また２００μｍを超えると凹凸面貼付性が低下し、耐水性が不充分となる傾向が見られる。
(Core material)
In the double-sided pressure-sensitive adhesive tape of the present invention, the core material constituting the laminate needs to have a 5% tensile stress in the range of 3 to 100 N and a bending resistance (Gurley method) of 0.2 mN or less. If the tensile stress is less than 3N, the workability deteriorates. On the other hand, if it exceeds 100N, the uneven surface sticking property decreases and the water resistance becomes insufficient. The tensile stress is preferably in the range of 3 to 50N, more preferably 5 to 20N.
Further, the bending resistance (Gurley method) is required to be 0.2 mN or less. When this bending resistance exceeds 0.2 mN, the surface bonding force decreases. From the viewpoint of surface bonding force, the bending resistance is preferably 0.15 mN or less, and more preferably 0.1 mN or less. Although there is no restriction | limiting in particular about the lower limit of this bending resistance, Usually, it is about 0.01 mN.
Further, the core material is preferably a synthetic resin film having a thickness of 2 to 400 μm, more preferably a film of 10 to 200 μm, and further preferably a film of 50 to 150 μm.
If the thickness of the core material film is less than 2 μm, the workability of the core material itself, the suitability for cutting the double-sided pressure-sensitive adhesive tape, the suitability for punching and the strength cannot be obtained sufficiently. On the other hand, if it exceeds 200 μm, the uneven surface sticking property tends to be lowered and the water resistance tends to be insufficient.
なお、上記５％引張り応力及び剛軟度（ガーレ法）は、以下に示す方法で測定された値である。
＜芯材の５％引張り応力の測定方法＞
芯材を幅１５ｍｍ、長さ５０ｍｍに裁断して測定用サンプルを作製し、万能引張り試験機を使用して、測定用サンプルの両端部１０ｍｍをセットし、幅１５ｍｍ、長さ３０ｍｍの測定箇所を引張り速度２００ｍｍ／ｍｉｎで５％伸ばした際の応力を測定する。
The 5% tensile stress and the bending resistance (Gurley method) are values measured by the following method.
<Method for measuring 5% tensile stress of core material>
The core material is cut into a width of 15 mm and a length of 50 mm to prepare a measurement sample. Using a universal tensile testing machine, both end portions of the measurement sample are set to 10 mm, and a measurement point with a width of 15 mm and a length of 30 mm is set. The stress when stretched 5% at a pulling speed of 200 mm / min is measured.
＜芯材の剛軟度（ガーレ法）の測定方法＞
芯材を長さ３８ｍｍ、幅２５ｍｍに裁断して測定用サンプルを作製し、ガーレ式剛軟度試験機を使用して、「ＪＩＳ Ｌ １０８５（１９９８）６．１０．３ ガーレ法」に準じて剛軟度を測定する。
<Measuring method of bending resistance (Gurley method) of core material>
The core material is cut into a length of 38 mm and a width of 25 mm to prepare a measurement sample. Using a Gurley type bending resistance tester, according to “JIS L 1085 (1998) 6.10.3 Gurley method”. Measure bending resistance.
本発明の両面粘着テープの積層体を構成する芯材は、前述した性状を満たすと共に、さらに後で説明する、芯材とその両面に設けられた粘着剤層とを有する積層体の０℃における貯蔵弾性率が０.６〜３.７ＭＰａであることを要し、好ましくは１.０〜３.６ＭＰａ、より好ましくは１.５〜３.４ＭＰａである要件を満たすものであればよく、特に制限されず、従来公知の合成樹脂フィルムの中から適宜選択して用いることができる。 The core material constituting the laminate of the double-sided pressure-sensitive adhesive tape of the present invention satisfies the above-described properties, and further describes the laminate at 0 ° C. having the core material and the pressure-sensitive adhesive layer provided on both surfaces thereof. It is required that the storage elastic modulus is 0.6 to 3.7 MPa, preferably 1.0 to 3.6 MPa, more preferably 1.5 to 3.4 MPa, and in particular, It is not restrict | limited, It can select suitably from a conventionally well-known synthetic resin film and can use it.
当該芯材を構成する、前述した性状を有する合成樹脂フィルムとしては、例えばオレフィン系単量体単位を８０〜１００質量％程度、好ましくは８５〜９９質量％、より好ましくは９０〜９８質量％を含有するオレフィン系重合体を用いて形成されたフィルムを好適に使用することができる。
このようなオレフィン系重合体の具体例としては、エチレン−メタクリル酸共重合体や、エチレン−酢酸ビニル共重合体、ポリエチレンなどを挙げることができる。これらのオレフィン系重合体は、１種を単独で用いてもよいし、２種以上を組み合わせて用いてもよい。
As the synthetic resin film having the above-mentioned properties constituting the core material, for example, the olefin monomer unit is about 80 to 100% by mass, preferably 85 to 99% by mass, more preferably 90 to 98% by mass. A film formed using the containing olefin polymer can be suitably used.
Specific examples of such an olefin polymer include an ethylene-methacrylic acid copolymer, an ethylene-vinyl acetate copolymer, and polyethylene. One of these olefin polymers may be used alone, or two or more thereof may be used in combination.
当該芯材を構成する合成樹脂フィルムは、その両面に設けられる粘着剤層との密着性を向上させる目的で、所望により両面に、酸化法や凹凸化法などにより表面処理、あるいはプライマー処理を施すことができる。上記酸化法としては、例えばコロナ放電処理、プラズマ放電処理、クロム酸処理（湿式）、熱風処理、オゾン・紫外線照射処理などが挙げられ、また、凹凸化法としては、例えばサンドブラスト法、溶剤処理法などが挙げられる。これらの表面処理法は合成樹脂フィルムの種類に応じて適宜選ばれるが、一般にはコロナ放電処理法が効果及び操作性などの面から、好ましく用いられる。
なお、当該芯材の色については特に制限はなく、無色のものであってもよく、適当な色に着色されていてもよい。
また、当該芯材は発泡体構造ではないことが好ましい。発泡体構造を有する芯材を使用した両面粘着テープでは、水の浸透を制御する独立気泡の泡壁を幅方向に対して十分に確保できない。
The synthetic resin film constituting the core material is subjected to surface treatment or primer treatment on both surfaces by an oxidation method or a concavo-convex method, if desired, for the purpose of improving the adhesion to the adhesive layer provided on both surfaces thereof. be able to. Examples of the oxidation method include corona discharge treatment, plasma discharge treatment, chromic acid treatment (wet), hot air treatment, ozone / ultraviolet irradiation treatment and the like, and examples of the unevenness method include a sand blast method and a solvent treatment method. Etc. These surface treatment methods are appropriately selected according to the type of the synthetic resin film. In general, the corona discharge treatment method is preferably used from the viewpoints of effects and operability.
In addition, there is no restriction | limiting in particular about the color of the said core material, A colorless thing may be sufficient and it may be colored by the appropriate color.
Moreover, it is preferable that the said core material is not a foam structure. In a double-sided pressure-sensitive adhesive tape using a core material having a foam structure, it is not possible to sufficiently secure a closed cell foam wall for controlling the penetration of water in the width direction.
（粘着剤層）
本発明の両面粘着テープにおいて、前述した芯材を構成する合成樹脂フィルムの両面に設けられる２つの粘着剤層は、２３℃におけるｔａｎδ（損失正接）が、それぞれ０.６以上であることを要する。該ｔａｎδが０.６未満では被着体に対する面接合力が不充分となる。該ｔａｎδは０.７以上であることが好ましく、その上限については特に制限はないが、通常２.０程度である。
また、前記２つの粘着剤層の厚さは、それぞれ２０〜１００μｍの範囲であることが好ましく、４０〜７０μｍの範囲であることがより好ましい。当該粘着剤層の厚さが２０μｍ未満であると、充分な面接合力が得られにくく、一方１００μｍを超えると加工性が低下する傾向が見られる。
なお、当該粘着剤層の２３℃におけるｔａｎδ（損失正接）の測定方法を下記に示す。
＜２３℃ｔａｎδの測定方法＞
粘着剤層を積層し、２ｍｍの厚さとし、直径８ｍｍの円柱に裁断して、測定用サンプルを作製する。次いで、動的粘弾性測定装置を使用して、温度２３℃におけるｔａｎδを測定する。
(Adhesive layer)
In the double-sided pressure-sensitive adhesive tape of the present invention, the two pressure-sensitive adhesive layers provided on both surfaces of the synthetic resin film constituting the core material described above require that tan δ (loss tangent) at 23 ° C. is 0.6 or more, respectively. . If the tan δ is less than 0.6, the surface bonding force to the adherend becomes insufficient. The tan δ is preferably 0.7 or more, and the upper limit thereof is not particularly limited, but is usually about 2.0.
The thicknesses of the two pressure-sensitive adhesive layers are each preferably in the range of 20 to 100 μm, and more preferably in the range of 40 to 70 μm. When the thickness of the pressure-sensitive adhesive layer is less than 20 μm, it is difficult to obtain a sufficient surface bonding force. On the other hand, when the thickness exceeds 100 μm, workability tends to decrease.
In addition, the measuring method of tan (delta) (loss tangent) in 23 degreeC of the said adhesive layer is shown below.
<Measurement method of 23 ° C. tan δ>
A pressure-sensitive adhesive layer is laminated, made to have a thickness of 2 mm, and cut into a cylinder having a diameter of 8 mm to prepare a measurement sample. Next, tan δ at a temperature of 23 ° C. is measured using a dynamic viscoelasticity measuring apparatus.
本発明の両面粘着テープにおいては、芯材と、その両面に設けられた粘着剤層とを有する積層体は、０℃における貯蔵弾性率が０.６〜３.７ＭＰａであることを要する。該貯蔵弾性率が０.６ＭＰａ未満では、充分な裁断加工性が得られず、一方３.７ＭＰａを超えると面接合力が低下する。このような観点から、該貯蔵弾性率は、好ましくは５〜３０ＭＰａであり、より好ましくは１.５〜３.４ＭＰａである。
なお、前記積層体の０℃における貯蔵弾性率の測定方法を下記に示す。
＜積層体の０℃貯蔵弾性率の測定方法＞
積層体を複数積層して約２ｍｍの厚さとし、直径８ｍｍの円柱に裁断して、測定用サンプルを作製する。次いで、動的粘弾性測定装置を使用して、周波数１Ｈｚ、温度０℃における貯蔵弾性率を測定する。
本発明の両面粘着テープにおいては、２つの粘着剤層は、それぞれの性状が前述した要件を満たすものであれば、同一の組成及び性状を有するものであってもよいし、異なる組成及び性状を有するものであってもよいが、生産性の観点から、同一の組成及び性状を有するものが好ましい。
In the double-sided pressure-sensitive adhesive tape of the present invention, the laminate having the core material and the pressure-sensitive adhesive layer provided on both surfaces thereof needs to have a storage elastic modulus at 0 ° C. of 0.6 to 3.7 MPa. If the storage elastic modulus is less than 0.6 MPa, sufficient cutting workability cannot be obtained, while if it exceeds 3.7 MPa, the surface bonding force is reduced. From such a viewpoint, the storage elastic modulus is preferably 5 to 30 MPa, and more preferably 1.5 to 3.4 MPa.
In addition, the measuring method of the storage elastic modulus in 0 degreeC of the said laminated body is shown below.
<Method for measuring 0 ° C. storage elastic modulus of laminate>
A plurality of laminates are laminated to a thickness of about 2 mm, and cut into a cylinder having a diameter of 8 mm to produce a measurement sample. Next, the storage elastic modulus at a frequency of 1 Hz and a temperature of 0 ° C. is measured using a dynamic viscoelasticity measuring apparatus.
In the double-sided pressure-sensitive adhesive tape of the present invention, the two pressure-sensitive adhesive layers may have the same composition and properties as long as each property satisfies the requirements described above, or have different compositions and properties. However, from the viewpoint of productivity, those having the same composition and properties are preferable.
本発明の両面粘着テープにおける２つの粘着剤層を構成する粘着剤の種類としては、前述した要件を満たすものであればよく、特に制限されず、各種の粘着剤、例えばアクリル系粘着剤、ゴム系粘着剤、シリコーン系粘着剤、ポリウレタン系粘着剤、ポリエステル系粘着剤及び紫外線硬化型粘着剤などを用いることができるが、これらの中で、耐候性、粘着性能、経済性などの観点から、アクリル系粘着剤が好適に用いられる。 The type of pressure-sensitive adhesive constituting the two pressure-sensitive adhesive layers in the double-sided pressure-sensitive adhesive tape of the present invention is not particularly limited as long as it satisfies the above-mentioned requirements, and various pressure-sensitive adhesives such as acrylic pressure-sensitive adhesives and rubbers. -Based adhesive, silicone-based adhesive, polyurethane-based adhesive, polyester-based adhesive and UV-curable adhesive, etc. can be used, among these, from the viewpoint of weather resistance, adhesive performance, economy, etc. An acrylic pressure-sensitive adhesive is preferably used.
＜アクリル系粘着剤＞
本発明の両面粘着テープにおいて、２つの粘着剤層をそれぞれ構成するアクリル系粘着剤としては、(メタ)アクリル酸エステル共重合体を主成分として含むと共に、必要に応じて架橋剤を含む粘着剤組成物を熱架橋してなるものが好ましい。(メタ)アクリル酸エステル共重合体としては特に制限はなく、従来アクリル系粘着剤の樹脂成分として慣用されている(メタ)アクリル酸エステル共重合体の中から任意のものを適宜選択して用いることができる。このような(メタ)アクリル酸エステル共重合体としては、例えばエステル部分のアルキル基の炭素数が１〜２０の(メタ)アクリル酸エステルと、活性水素をもつ官能基を有する単量体と、所望により用いられる他の単量体との共重合体を好ましく挙げることができる。なお、(メタ)アクリル酸エステルは、メタクリル酸エステル及び／又はアクリル酸エステルを意味する。
ここで、エステル部分のアルキル基の炭素数が１〜２０の(メタ)アクリル酸エステルの例としては、メチル(メタ)アクリレート、エチル(メタ)アクリレート、プロピル(メタ)アクリレート、イソプロピル(メタ)アクリレート、ブチル(メタ)アクリレート、オクチル(メタ)アクリレート、イソブチル(メタ)アクリレート、ペンチル(メタ)アクリレート、ヘキシル(メタ)アクリレート、シクロヘキシル(メタ)アクリレート、２−エチルヘキシル(メタ)アクリレート、イソオクチル(メタ)アクリレート、デシル(メタ)アクリレート、ドデシル(メタ)アクリレート、ミリスチル(メタ)アクリレート、パルミチル(メタ)アクリレート、ステアリル(メタ)アクリレートなどが挙げられる。これらは単独で用いてもよいし、２種以上を組み合わせて用いてもよい。
<Acrylic adhesive>
In the double-sided pressure-sensitive adhesive tape of the present invention, as the acrylic pressure-sensitive adhesive constituting each of the two pressure-sensitive adhesive layers, a pressure-sensitive adhesive containing a (meth) acrylic acid ester copolymer as a main component and, if necessary, a crosslinking agent. Those obtained by thermally crosslinking the composition are preferred. The (meth) acrylic acid ester copolymer is not particularly limited, and any one of (meth) acrylic acid ester copolymers conventionally used as a resin component of an acrylic pressure-sensitive adhesive is appropriately selected and used. be able to. As such a (meth) acrylic acid ester copolymer, for example, a (meth) acrylic acid ester having 1 to 20 carbon atoms in the alkyl group of the ester portion, a monomer having a functional group having active hydrogen, Preferred examples include copolymers with other monomers used as desired. In addition, (meth) acrylic acid ester means methacrylic acid ester and / or acrylic acid ester.
Here, examples of the (meth) acrylic acid ester having 1 to 20 carbon atoms in the alkyl group of the ester portion include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, and isopropyl (meth) acrylate. , Butyl (meth) acrylate, octyl (meth) acrylate, isobutyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate Decyl (meth) acrylate, dodecyl (meth) acrylate, myristyl (meth) acrylate, palmityl (meth) acrylate, stearyl (meth) acrylate, and the like. These may be used alone or in combination of two or more.
一方、活性水素をもつ官能基を有する単量体の例としては、２−ヒドロキシエチル(メタ)アクリレート、２−ヒドロキシプロピル(メタ)アクリレート、３−ヒドロキシプロピル(メタ)アクリレート、２−ヒドロキシブチル(メタ)アクリレート、３−ヒドロキシブチル(メタ)アクリレート、４−ヒドロキシブチル(メタ)アクリレートなどのヒドロキシアルキル(メタ)アクリレート、モノメチルアミノエチル(メタ)アクリレート、モノエチルアミノエチル(メタ)アクリレート、モノメチルアミノプロピル(メタ)アクリレート、モノエチルアミノプロピル(メタ)アクリレートなどのモノアルキルアミノアルキル(メタ)アクリレート；アクリル酸、メタクリル酸、クロトン酸、マレイン酸、イタコン酸、シトラコン酸などのエチレン性不飽和カルボン酸などが挙げられる。これらの単量体は単独で用いてもよいし、２種以上を組み合わせて用いてもよい。 On the other hand, examples of the monomer having a functional group having active hydrogen include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl ( Hydroxyalkyl (meth) acrylate such as (meth) acrylate, 3-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, monomethylaminoethyl (meth) acrylate, monoethylaminoethyl (meth) acrylate, monomethylaminopropyl Monoalkylaminoalkyl (meth) acrylates such as (meth) acrylate and monoethylaminopropyl (meth) acrylate; ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, citraconic acid, etc. But It is below. These monomers may be used independently and may be used in combination of 2 or more type.
また、所望により用いられる他の単量体の例としては酢酸ビニル、プロピオン酸ビニルなどのビニルエステル類；エチレン、プロピレン、イソブチレンなどのオレフィン類；塩化ビニル、ビニリデンクロリドなどのハロゲン化オレフィン類；スチレン、α−メチルスチレンなどのスチレン系単量体；ブタジエン、イソプレン、クロロプレンなどのジエン系単量体；アクリロニトリル、メタクリロニトリルなどのニトリル系単量体；アクリルアミド、Ｎ−メチルアクリルアミド、Ｎ,Ｎ−ジメチルアクリルアミドなどのアクリルアミド類などが挙げられる。これらは単独で用いてもよいし、２種以上を組み合わせて用いてもよい。 Examples of other monomers used as desired include vinyl esters such as vinyl acetate and vinyl propionate; olefins such as ethylene, propylene and isobutylene; halogenated olefins such as vinyl chloride and vinylidene chloride; styrene Styrene monomers such as α-methylstyrene; diene monomers such as butadiene, isoprene and chloroprene; nitrile monomers such as acrylonitrile and methacrylonitrile; acrylamide, N-methylacrylamide, N, N- Examples include acrylamides such as dimethylacrylamide. These may be used alone or in combination of two or more.
樹脂成分として用いられる前記(メタ)アクリル酸エステル共重合体は、その共重合形態については特に制限はなく、ランダム、ブロック、グラフト共重合体のいずれであってもよい。また、分子量は、重量平均分子量で３０万以上が好ましく、５０万〜２５０万がより好ましい。この重量平均分子量が３０万未満では被着体との接着性や耐久接着性が不充分となるおそれがある。接着性、及び耐久接着性などを考慮すると、この重量平均分子量は、７０万〜１８０万のものが好ましい。
なお、上記重量平均分子量は、ゲルパーミエーションクロマトグラフィー（ＧＰＣ）法により測定した標準ポリスチレン換算の値である。
さらに、この(メタ)アクリル酸エステル共重合体においては、活性水素をもつ官能基を有する単量体単位の含有量は、０.０１〜１０質量％の範囲が好ましい。この含有量が０.０１質量％未満では架橋点が少なすぎて、架橋が不充分となり、粘着剤層の凝集破壊が生ずるおそれがあるし、１０質量％を超えると粘度の上昇によって塗工適性が低下するおそれが生じる。この活性水素をもつ官能基を有する単量体単位のより好ましい含有量は０.０５〜６.０質量％であり、特に０.２〜５.０質量％の範囲が好ましい。
The (meth) acrylic acid ester copolymer used as the resin component is not particularly limited as to the form of copolymerization, and may be any of random, block, and graft copolymers. In addition, the molecular weight is preferably 300,000 or more, more preferably 500,000 to 2,500,000 in terms of weight average molecular weight. If the weight average molecular weight is less than 300,000, the adhesion to the adherend and the durable adhesion may be insufficient. In view of adhesiveness and durable adhesiveness, the weight average molecular weight is preferably 700,000 to 1,800,000.
In addition, the said weight average molecular weight is the value of standard polystyrene conversion measured by the gel permeation chromatography (GPC) method.
Further, in this (meth) acrylic acid ester copolymer, the content of the monomer unit having a functional group having active hydrogen is preferably in the range of 0.01 to 10% by mass. If the content is less than 0.01% by mass, the number of crosslinking points is too small, and crosslinking may be insufficient, which may cause cohesive failure of the pressure-sensitive adhesive layer. May decrease. The more preferable content of the monomer unit having a functional group having active hydrogen is 0.05 to 6.0% by mass, and the range of 0.2 to 5.0% by mass is particularly preferable.
＜架橋剤＞
この架橋剤としては特に制限はなく、従来アクリル系樹脂において架橋剤として慣用されているものの中から、任意のものを適宜選択して用いることができる。このような架橋剤としては、例えばポリイソシアネート化合物、エポキシ樹脂、メラミン樹脂、尿素樹脂、ジアルデヒド類、メチロールポリマー、アジリジン系化合物、金属キレート化合物、金属アルコキシド、金属塩などが挙げられるが、ポリイソシアネート化合物が好ましく用いられる。
ここで、ポリイソシアネート化合物の例としては、トリレンジイソシアネート、ジフェニルメタンジイソシアネート、キシリレンジイソシアネートなどの芳香族ポリイソシアネート、ヘキサメチレンジイソシアネートなどの脂肪族ポリイソシアネート、イソホロンジイソシアネート、水素添加ジフェニルメタンジイソシアネートなどの脂環式ポリイソシアネートなど、及びそれらのビウレット体、イソシアヌレート体、さらにはエチレングリコール、プロピレングリコール、ネオペンチルグリコール、トリメチロールプロパン、ヒマシ油などの低分子活性水素含有化合物との反応物であるアダクト体などを挙げることができる。
<Crosslinking agent>
There is no restriction | limiting in particular as this crosslinking agent, From the things conventionally used as a crosslinking agent conventionally in acrylic resin, arbitrary things can be selected suitably and can be used. Examples of such crosslinking agents include polyisocyanate compounds, epoxy resins, melamine resins, urea resins, dialdehydes, methylol polymers, aziridine compounds, metal chelate compounds, metal alkoxides, and metal salts. A compound is preferably used.
Examples of the polyisocyanate compound include aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, and xylylene diisocyanate, aliphatic polyisocyanates such as hexamethylene diisocyanate, isophorone diisocyanate, and hydrogenated diphenylmethane diisocyanate. Polyisocyanates, etc., and biurets, isocyanurates, and adducts that are a reaction product with low molecular active hydrogen-containing compounds such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, castor oil, etc. Can be mentioned.
本発明においては、この架橋剤は１種を単独で用いてもよいし、２種以上を組み合わせて用いてもよい。また、その使用量は、架橋剤の種類にもよるが、前記(メタ)アクリル酸エステル共重合体の固形分１００質量部に対し、通常０.０１〜２０質量部、好ましくは、０.１〜１０質量部の範囲で選定される。
当該粘着剤組成物には、本発明の目的が損なわれない範囲で、各種添加剤、例えばシラン系カップリング剤、粘着付与剤、酸化防止剤、紫外線吸収剤、光安定剤、軟化剤、充填剤、着色剤などを、所望により含有させることができる。
In this invention, this crosslinking agent may be used individually by 1 type, and may be used in combination of 2 or more type. The amount used depends on the type of the crosslinking agent, but is usually 0.01 to 20 parts by mass, preferably 0.1 to 100 parts by mass of the solid content of the (meth) acrylic acid ester copolymer. It is selected in the range of -10 parts by mass.
In the pressure-sensitive adhesive composition, various additives such as a silane coupling agent, a tackifier, an antioxidant, an ultraviolet absorber, a light stabilizer, a softener, and a filler are added as long as the object of the present invention is not impaired. Agents, colorants and the like can be included as desired.
＜剥離シート＞
本発明の両面粘着テープにおいては、搬送時や使用時の利便性から剥離シートを積層したものが好ましい。本発明の両面粘着テープが２枚の剥離シートに挟持された形態でもよいし、両面に離型性を持たせた１枚の剥離シートと積層してそのまま巻き取った形態でもよい。
本発明の両面粘着テープに用いられる剥離シートとしては、種々の剥離シートを使用できるが、代表的に剥離性を表面に有する剥離シート用基材から構成される。剥離シート用基材としては、ポリエチレンテレフタレート、ポリエチレン、ポリプロピレン、ポリブデン、ポリブタジエン、ポリメチルペンテン、ポリ塩化ビニル、塩化ビニル共重合体、ポリブチレンテレフタレート、ポリウレタン、エチレン−酢酸ビニル共重合体、アイオノマー樹脂、エチレン(メタ)アクリル酸共重合体、ポリスチレン、ポリカーボネート、フッ素樹脂、低密度ポリエチレン、直鎖低密度ポリエチレン、トリアセチルセルロース等の樹脂フィルムや、上質紙、コート紙、グラシン紙、ラミネート紙などが挙げられる。これらの中で、安価でコシもあるポリエチレンテレフタレートフィルムが好ましい。剥離シート用基材の厚さは、５μｍ〜３００μｍが好ましく、１０μｍ〜２００μｍがより好ましい。
剥離シート用基材の表面に剥離性を持たせるには、その表面にシリコーン系樹脂、フッ素系樹脂、長鎖アルキル基系樹脂等の剥離剤を塗布することにより設ける。これらの中で、安価で安定した性能が得られるシリコーン系樹脂が好ましい。剥離剤層の厚さは、０.０５μｍ〜２.０μｍが好ましく、０.１μｍ〜１.５μｍがより好ましい。
本発明の両面粘着テープを製造する際には、それぞれの剥離シートの剥離力に差をつけておくことが好ましい。剥離力に差をつけておけば、軽剥離シート側のみを剥がす際に、粘着剤層が重剥離シート側から浮くおそれや、双方の剥離シートに追従しようとして粘着剤層が引き伸ばされて変形するおそれを防ぐことができる。また、両面に離型性を持たせた１枚の剥離シートと積層してそのまま巻き取った両面粘着テープ形態の場合においても、剥離シートの表裏で剥離力に差をつけておくことで、同様の効果が得られる。
<Peeling sheet>
In the double-sided pressure-sensitive adhesive tape of the present invention, a laminate of release sheets is preferred for convenience during transportation and use. The double-sided pressure-sensitive adhesive tape of the present invention may be sandwiched between two release sheets, or may be laminated with a single release sheet having releasability on both sides and wound as it is.
Although various release sheets can be used as the release sheet used for the double-sided pressure-sensitive adhesive tape of the present invention, it is typically composed of a release sheet substrate having release properties on the surface. As the release sheet substrate, polyethylene terephthalate, polyethylene, polypropylene, polybutene, polybutadiene, polymethylpentene, polyvinyl chloride, vinyl chloride copolymer, polybutylene terephthalate, polyurethane, ethylene-vinyl acetate copolymer, ionomer resin, Resin films such as ethylene (meth) acrylic acid copolymer, polystyrene, polycarbonate, fluororesin, low density polyethylene, linear low density polyethylene, triacetyl cellulose, fine paper, coated paper, glassine paper, laminate paper, etc. It is done. Among these, a polyethylene terephthalate film that is inexpensive and firm is preferable. The thickness of the release sheet substrate is preferably 5 μm to 300 μm, and more preferably 10 μm to 200 μm.
In order to give the surface of the release sheet substrate a release property, it is provided by applying a release agent such as a silicone resin, a fluorine resin, or a long chain alkyl group resin to the surface. Of these, silicone resins that are inexpensive and provide stable performance are preferred. The thickness of the release agent layer is preferably 0.05 μm to 2.0 μm, and more preferably 0.1 μm to 1.5 μm.
When producing the double-sided pressure-sensitive adhesive tape of the present invention, it is preferable to make a difference in the peeling force of each release sheet. If there is a difference in the peel force, when peeling only the light release sheet side, the adhesive layer may float from the heavy release sheet side, or the adhesive layer will stretch and deform to follow both release sheets Fear can be prevented. In addition, even in the case of a double-sided pressure-sensitive adhesive tape that is laminated and wound as it is with a single release sheet that has releasability on both sides, The effect is obtained.
（両面粘着テープの製造）
次に、本発明の両面粘着テープを製造する方法について説明する。
まず、前述の粘着剤組成物に、必要に応じて溶剤を加え、塗工に適した粘度に調整し、塗工液を作製する。
次に、軽剥離シート（又は重剥離シート）の剥離処理面に、前記塗工液を乾燥後の膜厚が２０〜１００μｍになるように、例えばバーコート法、リバースロールコート法、ナイフコート法、ロールナイフコート法、グラビアコート法、エアドクターコート法、ドクターブレードコート法など、従来公知の塗工方法により塗工し、８０〜１２０℃程度の温度で数十秒〜数分間乾燥後、芯材を貼合して片面粘着フィルムを作製する。
次いで、重剥離シート（又は軽剥離シート）の剥離処理面に、前記塗工液を乾燥後の膜厚が２０〜１００μｍになるように、前記と同様にして塗工、乾燥後、前記の片面粘着フィルムの芯材面と貼合することにより、本発明の両面粘着テープが得られる。
(Manufacture of double-sided adhesive tape)
Next, a method for producing the double-sided pressure-sensitive adhesive tape of the present invention will be described.
First, a solvent is added to the above-mentioned pressure-sensitive adhesive composition as necessary to adjust the viscosity suitable for coating, and a coating solution is prepared.
Next, on the release treatment surface of the light release sheet (or heavy release sheet), for example, a bar coating method, a reverse roll coating method, a knife coating method so that the film thickness after drying the coating liquid is 20 to 100 μm. Coating by a conventionally known coating method such as a roll knife coating method, a gravure coating method, an air doctor coating method, a doctor blade coating method, etc., dried at a temperature of about 80 to 120 ° C. for several tens of seconds to several minutes, and then a core A single-sided adhesive film is produced by laminating materials.
Next, on the release treatment surface of the heavy release sheet (or light release sheet), the coating liquid is coated and dried in the same manner as described above so that the film thickness after drying the coating liquid becomes 20 to 100 μm, and then the one side The double-sided pressure-sensitive adhesive tape of the present invention is obtained by laminating with the core surface of the pressure-sensitive adhesive film.
次に、本発明の両面粘着テープの用途について説明する。
［両面粘着テープの用途］
本発明の両面粘着テープは、芯材フィルムの両面に、特定の性状を有する粘着剤層を設けた、０℃における貯蔵弾性が特定の範囲にある積層体であって、例えば携帯電話やタッチパネルなどのモバイル製品における部材固定用などとして好適な、段差への貼合適性及び耐水性に優れ、狭額縁仕様の携帯情報端末に防水用両面粘着テープなどとして用いられる。
本発明の両面粘着テープは、芯材として、特定の性状を有する合成樹脂フィルムを使用しているため気孔を有さず、耐水性に優れ、０.１〜２ｍｍの幅で、さらに０.２〜１ｍｍの幅で防水用として用いられる。すなわち、狭額縁仕様の携帯情報端末に防水用両面粘着テープとして適用することができる。
本発明の両面粘着テープの形態としては、両面に剥離シートが貼着されてなる額縁状形態とすることができる。
また、本発明の両面粘着テープは、芯材層、粘着剤層のいずれかの層又は全ての層を黒色とすることができる。特に、当該両面粘着テープがディスプレイパネル等で透明保護板を筺体に接着する両面先着シートで透明保護板の外周（額縁）形状である場合、黒色のものが好ましい。
芯材や粘着剤層の黒色化は、カーボンブラック、あるいは黒色系の顔料や染料などを混入させることにより、行うことができる。
Next, the use of the double-sided pressure-sensitive adhesive tape of the present invention will be described.
[Use of double-sided adhesive tape]
The double-sided pressure-sensitive adhesive tape of the present invention is a laminate in which a pressure-sensitive adhesive layer having specific properties is provided on both surfaces of a core film, and has a storage elasticity at 0 ° C. in a specific range, such as a mobile phone or a touch panel. It is suitable for fixing parts in mobile products, and has excellent bonding suitability to water level and water resistance, and is used as a double-sided adhesive tape for waterproofing in narrow frame specification portable information terminals.
Since the double-sided pressure-sensitive adhesive tape of the present invention uses a synthetic resin film having specific properties as a core material, it has no pores, is excellent in water resistance, has a width of 0.1 to 2 mm, and is further 0.2. Used for waterproofing with a width of ˜1 mm. That is, it can be applied as a waterproof double-sided pressure-sensitive adhesive tape to a portable information terminal having a narrow frame specification.
As a form of the double-sided adhesive tape of this invention, it can be set as the frame shape form by which a peeling sheet is stuck on both surfaces.
Moreover, the double-sided adhesive tape of this invention can make black any layer or all the layers of a core material layer and an adhesive layer. In particular, when the double-sided pressure-sensitive adhesive tape is a double-sided first sheet that adheres the transparent protective plate to the housing with a display panel or the like and has an outer periphery (frame) shape of the transparent protective plate, a black one is preferable.
The blackening of the core material and the pressure-sensitive adhesive layer can be performed by mixing carbon black or a black pigment or dye.
本発明はまた、前述した本発明の両面粘着テープにより、タッチパネルモジュールと表示体とが固定されてなることを特徴とするタッチパネル付き表示装置をも提供する。 The present invention also provides a display device with a touch panel, wherein the touch panel module and the display body are fixed by the double-sided adhesive tape of the present invention described above.
次に、本発明を実施例により、さらに詳細に説明するが、本発明は、これらの例によってなんら限定されるものではない。
なお、各例で得られた両面粘着テープの諸特性は下記の方法に従って求めた。
（１）積層体（両面粘着テープ）の０℃における貯蔵弾性率
積層体を９サンプル積層して約２ｍｍの厚さとし、直径８ｍｍの円柱に裁断して、測定用サンプルを作製した。次いで、動的粘弾性測定装置［レオメトリック社製、機種名「ＤＹＮＡＭＩＣ ＡＮＡＬＹＺＥＲ ＲＤＡ−ＩＩ」］を使用して、温度０℃における貯蔵弾性率を測定した。
（２）粘着剤層の２３℃におけるｔａｎδ（損失正接）
粘着剤を積層し、２ｍｍの厚さとし、直径８ｍｍの円柱に裁断して、測定用サンプルを作製した。次いで、動的粘弾性測定装置［レオメトリック社製、機種名「ＤＹＮＡＭＩＣ ＡＮＡＬＹＺＥＲ ＲＤＡ−ＩＩ」］を使用して、周波数１Ｈｚ、温度２３℃におけるｔａｎδを測定した。
（３）芯材及び粘着剤層の厚さ
各例で得られた芯材及び粘着剤層の厚さを、ＪＩＳ Ｋ ７１３０に準じて、定圧厚さ測定器［テクロック社製、製品名「ＰＧ−０２」］で測定した。
（４）芯材の５％引張り応力
芯材を幅１５ｍｍ、長さ５０ｍｍに裁断して、測定用サンプルを作製した。次いで、万能引張り試験機［インストロン社製、製品名「インストロン５５８１型」］を使用して、測定用サンプルの両端部１０ｍｍをセットし、幅：１５ｍｍ、長さ３０ｍｍの測定箇所を引張り速度２００ｍｍ／ｍｉｎで５％伸ばした際の応力を測定した。
（５）芯材の剛軟度（ガーレ法）
芯材を長さ３８ｍｍ、幅２５ｍｍに裁断して、［東洋精機社製、製品名「ガーレ式柔軟度試験機」］を使用して、「ＪＩＳ Ｌ １０８５（１９９８）６.１０.３ ガーレ法」に準じて測定した。
（６）防水性試験
「ＪＩＳ Ｃ ０９２０（２００３）１４．２．７ 深さ０.１５〜１ｍの一時的潜水状態での第２特性数字７に対する試験」に準じて、評価した。図１は、測定用サンプルの平面図、図２は、上記平面図におけるＡ−Ａ線断面図、図３は、上記平面図におけるＢ−Ｂ線断面図である。試験に際し、縦７０ｍｍ、横５０ｍｍ、厚さ２ｍｍの２枚の透明アクリル板１ａ及び１ｂを、外形寸法が縦６０ｍｍ×横４０ｍｍで幅が１ｍｍの額縁状積層部材２にて貼り合わせた測定用サンプルを作製した。測定用サンプルの一方のアクリル板１ａには高さ１０μｍ、幅５ｍｍの十字状の黒色印刷３を行った段差があり、もう一方には段差のない平滑なアクリル板１ｂを使用した（図１〜図３参照）。測定用サンプルを作製し２４時間後に、測定用サンプルを水深１ｍに沈めて、３０分間静置した後、目視にて試験片内部への水の侵入の有無を確認し、下記の判定基準で防水性を評価した。
○：試験片内部に水の侵入なし（合格）。
×：試験片内部に水の侵入あり（不合格）。
（７）面接合力
アクリル板［三菱レイヨン社製、製品名「アクリライトＬ００１」、７０×５０×２ｍｍ」］を用意し、その片面にＵＶ硬化型インク［帝国インキ社製、製品名「ＰＯＳ−９１１墨」］を全面塗布した。次にステンレス板［パルテック社製、製品名「ＳＵＳ３０４＃６００」、１５０×７０×０.５ｍｍ、片面＃６００研磨］の中央に直径２ｃｍの穴を貫通させたものを用意した。
次いで外形寸法が縦６０ｍｍ×横４０ｍｍで幅が２ｍｍの額縁状に加工した両面粘着テープでアクリル板のインク層とステンレス板の＃６００研磨面とを貼り合わせた。その後、１０ｍｍ／ｍｉｎの速度で、万能引張試験機［インストロン社製、製品名「インストロン５５８１型」］で、穴が開いてアクリル板のインク塗布面が表出している部分を、万能引張試験機の測定部に固定した治具（一辺が１０ｍｍのポリカーボネート樹脂からなる立方体を測定部の底面に接着テープで固定したもの、測定部とアクリル板の接触部は１０ｍｍ×１０ｍｍの正方形）で面方向に押し込むことで、両面粘着テープを剥がした際の応力（荷重のピーク値）を測定した。
図４は、面接合力の測定方法を示す説明図である。図４において（ａ）は断面図、（ｂ）は斜視図であり、符号１０は両面粘着テープ、１１は穴を有するアクリル板、１２は両面粘着テープ側にインク層１４を有するアクリル板、１３は押込み方向である。
（８）狭幅加工性
ＮＴカッターを用いて幅１ｍｍ、長さ５０ｍｍの形状に裁断加工を行った際、マイクロゲージを用いて、サンプル幅が１ｍｍ±０.２ｍｍであることを確認し、１ｍｍ±０.２ｍｍの範囲内であれば○、範囲外であれば×とした。
EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by these examples.
In addition, the various characteristics of the double-sided adhesive tape obtained in each example were calculated | required according to the following method.
(1) Storage elastic modulus at 0 ° C. of laminate (double-sided pressure-sensitive adhesive tape) 9 samples of the laminate were laminated to a thickness of about 2 mm, and cut into a cylinder having a diameter of 8 mm to prepare a measurement sample. Subsequently, the storage elastic modulus at a temperature of 0 ° C. was measured using a dynamic viscoelasticity measuring device [Rheometric Co., Ltd., model name “DYNAMIC ANALYZER RDA-II”].
(2) Tan δ (loss tangent) of the pressure-sensitive adhesive layer at 23 ° C.
A pressure-sensitive adhesive was laminated, made 2 mm thick, and cut into a cylinder with a diameter of 8 mm to prepare a measurement sample. Subsequently, tan δ at a frequency of 1 Hz and a temperature of 23 ° C. was measured using a dynamic viscoelasticity measuring apparatus [manufactured by Rheometric Co., Ltd., model name “DYNAMIC ANALYZER RDA-II”].
(3) Thickness of the core material and the pressure-sensitive adhesive layer The thickness of the core material and the pressure-sensitive adhesive layer obtained in each example was determined according to JIS K 7130 by a constant pressure thickness measuring instrument [manufactured by Teclock Corporation, product name “PG -02 "].
(4) 5% tensile stress of core material The core material was cut into a width of 15 mm and a length of 50 mm to prepare a measurement sample. Next, using a universal tensile tester [Instron, product name “Instron 5581 type”], 10 mm on both ends of the measurement sample is set, and a measurement point with a width of 15 mm and a length of 30 mm is pulled. The stress when stretched 5% at 200 mm / min was measured.
(5) Bending softness of core material (Gurley method)
The core material is cut into a length of 38 mm and a width of 25 mm, and [JIS L 1085 (1998) 6.10.3 Gurley method is used using a product name “Gurley type flexibility tester” manufactured by Toyo Seiki Co., Ltd.]. It measured according to.
(6) Waterproof test It evaluated according to "JIS C 0920 (2003) 14.2.7 Test for the second characteristic number 7 in a temporary diving state with a depth of 0.15 to 1 m". FIG. 1 is a plan view of a measurement sample, FIG. 2 is a cross-sectional view taken along line AA in the plan view, and FIG. 3 is a cross-sectional view taken along line BB in the plan view. In the test, a sample for measurement in which two
○: No penetration of water into the test piece (pass).
X: There is water intrusion inside the specimen (failed).
(7) Surface bonding force An acrylic plate [Mitsubishi Rayon Co., Ltd., product name “Acrylite L001”, 70 × 50 × 2 mm ”] was prepared, and UV curable ink [Teikoku Co., Ltd., product name“ POS- 911 ink "] was applied to the entire surface. Next, a stainless steel plate [manufactured by Partec Co., Ltd., product name “SUS304 # 600”, 150 × 70 × 0.5 mm, single-sided # 600 polishing] having a hole with a diameter of 2 cm in the center thereof was prepared.
Next, the ink layer of the acrylic plate and the # 600 polished surface of the stainless steel plate were bonded to each other with a double-sided pressure-sensitive adhesive tape processed into a frame shape having an outer dimension of 60 mm long × 40 mm wide and 2 mm wide. Then, at a speed of 10 mm / min, using a universal tensile tester [Instron, product name “Instron 5581 type”], the portion where the ink coating surface of the acrylic plate is exposed is opened Surface with a jig fixed to the measuring part of the testing machine (a cube made of polycarbonate resin with a side of 10 mm fixed to the bottom of the measuring part with adhesive tape, the contact part between the measuring part and the acrylic plate is a 10 mm × 10 mm square) By pressing in the direction, the stress (peak value of load) when the double-sided pressure-sensitive adhesive tape was peeled was measured.
FIG. 4 is an explanatory diagram showing a method for measuring the surface bonding force. 4, (a) is a cross-sectional view, (b) is a perspective view, 10 is a double-sided adhesive tape, 11 is an acrylic plate having holes, 12 is an acrylic plate having an
(8) Narrow width workability When cutting into a shape of 1 mm wide and 50 mm long using an NT cutter, using a micro gauge, confirm that the sample width is 1 mm ± 0.2 mm, 1 mm If it was within the range of ± 0.2 mm, it was marked as ◯, and if it was outside the range, it was marked as x.
調製例１ 粘着剤形成用塗布液１の調製
ブチルアクリレート（ＢＡ）、２−エチルヘキシルアクリレート（２ＥＨＡ）、２−ヒドロキシエチルアクリレート（ＨＥＡ）をモノマー成分とするアクリル系共重合体（ＢＡ／２ＥＨＡ／ＨＥＡ質量比＝８０：１９：１、重量平均分子量８０万、濃度５５質量％）１００質量部に、粘着性付与剤［荒川化学工業社製、製品名「パインクリスタルＫＥ−３５９」］１０質量部、トリレンジイソシアネート系３官能性アダクト体［日本ポリウレタン社製、製品名「コロネートＬ」、濃度７５質量％］を１.８質量部（アクリル酸エステル共重合体の固形分１００質量部に対し、２.４５質量部）混合し、メチルエチルケトンで希釈して不揮発分濃度４０質量％の粘着剤形成用塗布液１を調製した。
Preparation Example 1 Preparation of Adhesive Forming Coating Liquid 1 Acrylic copolymer (BA / 2EHA / HEA) containing butyl acrylate (BA), 2-ethylhexyl acrylate (2EHA), and 2-hydroxyethyl acrylate (HEA) as monomer components (Mass ratio = 80: 19: 1, weight average molecular weight 800,000, concentration 55% by mass) 100 parts by mass, tackifier [Arakawa Chemical Industries, product name “Pine Crystal KE-359”] 10 parts by mass, 1.8 parts by mass of tolylene diisocyanate trifunctional adduct [manufactured by Nippon Polyurethane Co., Ltd., product name “Coronate L”, concentration: 75% by mass] (2 parts per 100 parts by mass of acrylic ester copolymer solids) .45 parts by mass) were mixed and diluted with methyl ethyl ketone to prepare a coating solution 1 for forming an adhesive having a nonvolatile content concentration of 40% by mass.
調製例２ 粘着剤形成用塗布液２の調製
ブチルアクリレート（ＢＡ）、アクリル酸（ＡＡ）、２−ヒドロキシエチルアクリレート（ＨＥＡ）をモノマー成分とするアクリル系共重合体（ＢＡ／ＡＡ／ＨＥＡ質量比＝９８：１.５：０.５、重量平均分子量８０万、濃度４０質量％）１００質量部に、粘着性付与剤［荒川化学工業社製、製品名「パインクリスタルＫＥ−３５９」］３０質量部、及びトリレンジイソシアネート系３官能性アダクト体［日本ポリウレタン社製、製品名「コロネートＬ」、濃度７５質量％］を０.５質量部（アクリル酸エステル共重合体の固形分１００質量部に対し、０.９４質量部）混合し、メチルエチルケトンで希釈して不揮発分３０質量％の粘着剤形成用塗布液２を調製した。
Preparation Example 2 Preparation of Adhesive Forming
調製例３ 粘着剤形成用塗布液３の調製
２−エチルヘキシルアクリレート（２ＥＨＡ）、シクロヘキシルアクリレート（ＣＨＡ）、２−ヒドロキシエチルアクリレート（ＨＥＡ）をモノマー成分とするアクリル系共重合体（２ＥＨＡ／ＣＨＡ／ＨＥＡ質量比＝５９.７：４０：０.３、重量平均分子量８０万、濃度４０質量％）１００質量部に、イソシアネート系架橋剤［東洋インキ社製、製品名「ＢＨＳ−８５１５」、濃度３７.５質量％］３質量部（アクリル酸エステル共重合体の固形分１００質量部に対し、２.８１質量部）混合し、メチルエチルケトンで希釈して不揮発分濃度３０質量％の粘着剤形成用塗布液３を調製した。
Preparation Example 3 Preparation of Adhesive Forming
調製例４ 粘着剤形成用塗布液４の調製
２−エチルヘキシルアクリレート（２ＥＨＡ）、シクロヘキシルアクリレート（ＣＨＡ）、２−ヒドロキシエチルアクリレート（ＨＥＡ）をモノマー成分とするアクリル系共重合体（２ＥＨＡ／ＣＨＡ／ＨＥＡ質量比＝５９.７：４０：０.３、重量平均分子量８０万、濃度４０質量％）１００質量部に、イソシアネート系架橋剤［東洋インキ社製、製品名「ＢＨＳ−８５１５」、濃度３７.５質量％］０.１質量部（アクリル酸エステル共重合体の固形分１００質量部に対し、０.０９質量部）混合し、メチルエチルケトンで希釈して不揮発分濃度３０質量％の粘着剤形成用塗布液４を調製した。
Preparation Example 4 Preparation of Adhesive Forming Coating Liquid 4 An acrylic copolymer (2EHA / CHA / HEA) containing 2-ethylhexyl acrylate (2EHA), cyclohexyl acrylate (CHA), and 2-hydroxyethyl acrylate (HEA) as monomer components (Mass ratio = 59.7: 40: 0.3, weight average molecular weight 800,000, concentration 40 mass%) and 100 parts by mass of an isocyanate-based crosslinking agent [manufactured by Toyo Ink, product name “BHS-8515”, concentration 37. 5% by mass] 0.1 parts by mass (0.09 parts by mass with respect to 100 parts by mass of the solid content of the acrylate copolymer) were mixed and diluted with methyl ethyl ketone for forming an adhesive having a non-volatile content of 30% by mass. Coating solution 4 was prepared.
調製例５ 粘着剤形成用塗布液５の調製
２−エチルヘキシルアクリレート（２ＥＨＡ）、ブチルアクリレート（ＢＡ）、酢酸ビニル（Ｖａｃ）、アクリル酸（ＡＡ）、２−ヒドロキシエチルアクリレート（ＨＥＡ）をモノマー成分とするアクリル系共重合体（２ＥＨＡ／ＢＡ／Ｖａｃ／ＡＡ／ＨＥＡ質量比＝４６.９：４６.９：５：１：０.２、重量平均分子量８０万、濃度５２質量％）１００質量部に、粘着性付与剤［荒川化学工業社製、製品名「パインクリスタルＫＥ−３５９」］３０質量部、イソシアネート系架橋剤［東洋インキ社製、製品名「ＢＨＳ−８５１５」、濃度３７.５質量％］２質量部（アクリル酸エステル共重合体の固形分１００質量部に対し、１.４４質量部）混合し、メチルエチルケトンで希釈して不揮発分濃度４０質量％の粘着剤形成用塗布液５を調製した。
Preparation Example 5 Preparation of Adhesive Forming Coating Liquid 5 2-Ethylhexyl acrylate (2EHA), butyl acrylate (BA), vinyl acetate (Vac), acrylic acid (AA), and 2-hydroxyethyl acrylate (HEA) as monomer components To 100 parts by mass of acrylic copolymer (2EHA / BA / Vac / AA / HEA mass ratio = 46.9: 46.9: 5: 1: 0.2, weight average molecular weight 800,000, concentration 52% by mass) , Tackifier [Arakawa Chemical Industries, product name “Pine Crystal KE-359”] 30 parts by mass, Isocyanate-based crosslinking agent [Toyo Ink, product name “BHS-8515”, concentration 37.5% by mass ] 2 parts by mass (1.44 parts by mass with respect to 100 parts by mass of the solid content of the acrylate copolymer), diluted with methyl ethyl ketone, and a non-volatile content of 40 parts by mass % Adhesive forming coating solution 5 was prepared.
実施例１
エチレン−メタクリル酸共重合体［三井・デュポンポリケミカル社製、製品名「Ｎ０９０３ＨＣ」、オレフィン系単量体単位９１質量％］を厚さ１００μｍに製膜し、両面にコロナ処理を施して芯材フィルムを得た。次に軽剥離シート［リンテック(株)製、商品名「ＳＰ−ＰＥＴ３８１０３１」］の剥離処理面に、ナイフコーターを用いて粘着剤形成用塗布液１を、乾燥後の厚さが５０μｍとなるように塗布し、１００℃で約２分間加熱乾燥して熱架橋した。その後、粘着剤層に前述の芯材フィルムをラミネートし、片面粘着フィルムを得た。
次いで重剥離シート［リンテック(株)製、商品名「ＳＰ−ＰＥＴ３８１１」］の剥離処理面に、ナイフコーターを用いて粘着剤形成用塗布液１を、乾燥後の厚さが５０μｍとなるように塗布し、１００℃で約２分間加熱乾燥して熱架橋したのち、前記の片面粘着フィルムの芯材フィルム面に貼合して両面粘着テープを作製した。
Example 1
An ethylene-methacrylic acid copolymer [Mitsui / DuPont Polychemical Co., Ltd., product name “N0903HC”, olefinic monomer unit 91 mass%] is formed to a thickness of 100 μm and subjected to corona treatment on both sides to form a core material A film was obtained. Next, the pressure-sensitive adhesive forming coating solution 1 is applied to the release-treated surface of a light release sheet [manufactured by Lintec Corporation, trade name “SP-PET381031”] using a knife coater so that the thickness after drying becomes 50 μm. And then thermally crosslinked at 100 ° C. for about 2 minutes. Thereafter, the above core material film was laminated on the pressure-sensitive adhesive layer to obtain a single-sided pressure-sensitive adhesive film.
Next, the pressure-sensitive adhesive-forming coating solution 1 is applied to the release-treated surface of the heavy release sheet [manufactured by Lintec Corporation, trade name “SP-PET3811”] using a knife coater so that the thickness after drying becomes 50 μm. After applying and drying by heating at 100 ° C. for about 2 minutes and thermally cross-linking, the double-sided pressure-sensitive adhesive tape was prepared by bonding to the core film surface of the single-sided adhesive film.
実施例２
実施例１において、粘着剤形成用塗布液１の代わりに、粘着剤形成用塗布液２を用いた以外は、実施例１と同様な操作を施し、両面粘着テープを作製した。
Example 2
A double-sided pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that the adhesive-forming
実施例３
実施例１において、芯材フィルムとしてポリエチレンフィルム［タマポリ社製、製品名「Ａ−１」、厚み１００μｍ］を使用したこと以外は、実施例１と同様に行い、両面粘着テープを作製した。
Example 3
In Example 1, a double-sided pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that a polyethylene film [manufactured by Tamapoly, product name “A-1”, thickness of 100 μm] was used as the core film.
実施例４
実施例１において、芯材フィルムとしてエチレン−酢酸ビニル共重合体［住友化学工業社製、製品名「エバテートＤ２０４５」、オレフィン系単量体単位９５質量％］を厚さ１００μｍに製膜し、両面にコロナ処理を施したものを使用したこと以外は、実施例１と同様に行い、両面粘着テープを作製した。
Example 4
In Example 1, an ethylene-vinyl acetate copolymer [manufactured by Sumitomo Chemical Co., Ltd., product name “Evertate D2045, olefin monomer unit 95 mass%] as a core film was formed to a thickness of 100 μm, and both sides were formed. A double-sided pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that a corona-treated one was used.
比較例１
粘着剤形成用塗布液１を重剥離シート［リンテック社製、製品名「ＳＰ−ＰＥＴ３８１１」］に塗布し、１００℃で２分間加熱して、重剥離シート上に厚さ５０μｍの粘着剤層を形成した。さらに粘着剤層に軽剥離シート［リンテック社製、製品名「ＳＰ−ＰＥＴ３８０１」］の剥離面をラミネートし、２枚の剥離シートに挟持された粘着シートを作製した。得られた粘着剤の重剥離シートと軽剥離シートを剥離し、粘着剤層を３枚貼り合わせて両面粘着テープを作製した。比較例１の５％引張り応力ならびに剛軟度については３枚のうちの真ん中の層を芯材とみなして測定した。
Comparative Example 1
The adhesive forming coating solution 1 is applied to a heavy release sheet [manufactured by Lintec, product name “SP-PET3811”] and heated at 100 ° C. for 2 minutes to form a 50 μm thick adhesive layer on the heavy release sheet. Formed. Furthermore, the release surface of the light release sheet [manufactured by Lintec, product name “SP-PET3801”] was laminated on the adhesive layer to prepare an adhesive sheet sandwiched between two release sheets. The obtained heavy release sheet and light release sheet of the pressure-sensitive adhesive were peeled off, and three pressure-sensitive adhesive layers were bonded together to produce a double-sided pressure-sensitive adhesive tape. The 5% tensile stress and the bending resistance of Comparative Example 1 were measured by regarding the middle layer of the three sheets as a core material.
比較例２
芯材として、厚さ１００μｍの黒色ポリオレフィン系発泡体［積水化学工業(株)製、商品名「ボラーラ」］を使用した以外は、実施例１と同様な操作を施し、両面粘着テープを作製した。
Comparative Example 2
A double-sided pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that a black polyolefin foam having a thickness of 100 μm (manufactured by Sekisui Chemical Co., Ltd., trade name “Borara”) was used as the core material. .
比較例３
芯材として、厚さ１００μｍのポリエチレンテレフタレート（ＰＥＴ）フィルム［東レ社製、製品名「ルミラーＴ−６０」］を使用した以外は、実施例１と同様な操作を施し、両面粘着テープを作製した。
Comparative Example 3
A double-sided pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that a polyethylene terephthalate (PET) film having a thickness of 100 μm [product name “Lumirror T-60” manufactured by Toray Industries, Inc.] was used as the core material. .
比較例４
実施例１において、粘着剤形成用塗布液１の代わりに、粘着剤形成用塗布液４を用いた以外は、実施例１と同様な操作を施し、両面粘着テープを作製した。
Comparative Example 4
In Example 1, a double-sided pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive forming coating solution 4 was used instead of the pressure-sensitive adhesive forming coating solution 1.
比較例５
実施例１において、粘着剤形成用塗布液１の代わりに、粘着剤形成用塗布液５を用いた以外は、実施例１と同様な操作を施し、両面粘着テープを作製した。
Comparative Example 5
A double-sided pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that the adhesive-forming coating solution 5 was used in place of the adhesive-forming coating solution 1 in Example 1.
比較例６
実施例３において、粘着剤形成用塗布液１の代わりに、粘着剤形成用塗布液５を用いた以外は、実施例１と同様な操作を施し、両面粘着テープを作製した。
前記実施例１〜４及び比較例１〜６で作製された両面粘着テープの諸特性の評価結果を第１表に示す。
Comparative Example 6
In Example 3, a double-sided pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive forming coating solution 5 was used instead of the pressure-sensitive adhesive forming coating solution 1.
Table 1 shows the evaluation results of various characteristics of the double-sided pressure-sensitive adhesive tapes produced in Examples 1 to 4 and Comparative Examples 1 to 6.
本発明の両面粘着テープは、芯材の両面に粘着剤層が設けられてなる積層体であって、例えば携帯電話やタッチパネルなどのモバイル製品における部材固定用などとして好適な、段差への貼合適性及び耐水性に優れ、額縁の幅の狭い携帯情報端末に防水用などとして用いられる。 The double-sided pressure-sensitive adhesive tape of the present invention is a laminate in which pressure-sensitive adhesive layers are provided on both surfaces of a core material, and is suitable for fixing a member in a mobile product such as a mobile phone or a touch panel. It is excellent in suitability and water resistance, and is used for waterproofing in portable information terminals with a narrow frame width.
１ａ 透明アクリル板
１ｂ 透明アクリル板
２ 額縁状積層部材
３ 十字状の黒色印刷
１０ 両面粘着テープ
１１ 穴を有するステンレス板
１２ 両面粘着テープ側がインク層を有するアクリル板
１３ 押込み方向
１４ インク層
DESCRIPTION OF
Claims (9)
（ａ）前記積層体の０℃における貯蔵弾性率が０.６〜３.７ＭＰａであること、
（ｂ）前記２つの粘着剤層の２３℃におけるｔａｎδ（損失正接）が、それぞれ０.６以上であること、
（ｃ）前記芯材の５％引張り応力が３〜１００Ｎであり、かつ剛軟度（ガーレ法）が０.２ｍＮ以下であること、
を特徴とする両面粘着テープ。 A double-sided pressure-sensitive adhesive tape comprising a core and a laminate having pressure-sensitive adhesive layers provided on both sides thereof,
(A) The storage elastic modulus at 0 ° C. of the laminate is 0.6 to 3.7 MPa,
(B) tan δ (loss tangent) at 23 ° C. of the two pressure-sensitive adhesive layers is 0.6 or more,
(C) The core material has a 5% tensile stress of 3 to 100 N and a bending resistance (Gurley method) of 0.2 mN or less.
Double-sided adhesive tape characterized by
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| JP2010218794A JP5740124B2 (en) | 2010-09-29 | 2010-09-29 | Double-sided adhesive tape and display device with touch panel |
| KR1020110094968A KR101884943B1 (en) | 2010-09-29 | 2011-09-21 | Double-sided adhesive tape and display device having touch panel |
| CN201110301301.4A CN102533145B (en) | 2010-09-29 | 2011-09-28 | Double sided pressure sensitive adhesive tape and display device having a touch panel |
| TW100134920A TWI538974B (en) | 2010-09-29 | 2011-09-28 | Double sided pressure sensitive adhesive tape and display device having a touch panel |
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| JP5740124B2 JP5740124B2 (en) | 2015-06-24 |
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| JP2017149902A (en) * | 2016-02-26 | 2017-08-31 | リンテック株式会社 | Water proof double-sided adhesive tape and mobile information terminal device |
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| JP2016000822A (en) * | 2011-01-25 | 2016-01-07 | 日立マクセル株式会社 | Double-sided adhesive tape for waterproofing |
| JP2012167247A (en) * | 2011-01-25 | 2012-09-06 | Hitachi Maxell Ltd | Double-sided self-adhesive tape for waterproofing |
| EP2980177A4 (en) * | 2013-03-28 | 2016-09-07 | Lintec Corp | Adhesive sheet for tire, method of producing adhesive sheet for tire and method of use of adhesive sheet for tire |
| EP2980177A1 (en) * | 2013-03-28 | 2016-02-03 | Lintec Corporation | Adhesive sheet for tire, method of producing adhesive sheet for tire and method of use of adhesive sheet for tire |
| JP2014224179A (en) * | 2013-05-15 | 2014-12-04 | 日立化成株式会社 | Adhesive for image display device, adhesive sheet for image display device, and method for manufacturing image display device using the same |
| JP2015013909A (en) * | 2013-07-03 | 2015-01-22 | 早川ゴム株式会社 | Adhesive tape for flat panel display |
| JP2017510696A (en) * | 2014-03-18 | 2017-04-13 | エヌディーフォス シーオー．， エルティーディー．Ｎｄｆｏｓ Ｃｏ．， Ｌｔｄ． | Double-sided tape for touch screen panel and manufacturing method thereof |
| JPWO2016103372A1 (en) * | 2014-12-24 | 2017-10-05 | リンテック株式会社 | Double-sided adhesive sheet for surface protection panel and surface protection panel |
| JP2016124881A (en) * | 2014-12-26 | 2016-07-11 | リンテック株式会社 | Waterproof double-sided adhesive tape, and portable information terminal |
| JP2016160276A (en) * | 2015-02-26 | 2016-09-05 | 積水化学工業株式会社 | Adhesive tape |
| WO2016148208A1 (en) * | 2015-03-17 | 2016-09-22 | 日立化成株式会社 | Adhesive sheet for image display device, adhesive layered body for image display device, and image display device |
| JP2016175984A (en) * | 2015-03-19 | 2016-10-06 | 積水化学工業株式会社 | Double-sided adhesive tape |
| JP2017149902A (en) * | 2016-02-26 | 2017-08-31 | リンテック株式会社 | Water proof double-sided adhesive tape and mobile information terminal device |
| JP2019099635A (en) * | 2017-11-30 | 2019-06-24 | 日東電工株式会社 | Pressure sensitive adhesive sheet |
| JP7125259B2 (en) | 2017-11-30 | 2022-08-24 | 日東電工株式会社 | Adhesive sheet |
| WO2023153428A1 (en) * | 2022-02-10 | 2023-08-17 | 株式会社村田製作所 | Electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5740124B2 (en) | 2015-06-24 |
| CN102533145B (en) | 2015-06-24 |
| CN102533145A (en) | 2012-07-04 |
| TWI538974B (en) | 2016-06-21 |
| KR101884943B1 (en) | 2018-08-02 |
| KR20120033245A (en) | 2012-04-06 |
| TW201219534A (en) | 2012-05-16 |
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