JP2017149902A - Water proof double-sided adhesive tape and mobile information terminal device - Google Patents
Water proof double-sided adhesive tape and mobile information terminal device Download PDFInfo
- Publication number
- JP2017149902A JP2017149902A JP2016035886A JP2016035886A JP2017149902A JP 2017149902 A JP2017149902 A JP 2017149902A JP 2016035886 A JP2016035886 A JP 2016035886A JP 2016035886 A JP2016035886 A JP 2016035886A JP 2017149902 A JP2017149902 A JP 2017149902A
- Authority
- JP
- Japan
- Prior art keywords
- sensitive adhesive
- adhesive tape
- double
- pressure
- sided
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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- 239000002390 adhesive tape Substances 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 239000011162 core material Substances 0.000 claims abstract description 58
- 238000003860 storage Methods 0.000 claims abstract description 16
- 239000012790 adhesive layer Substances 0.000 claims abstract description 15
- 238000005452 bending Methods 0.000 claims abstract description 15
- 239000006260 foam Substances 0.000 claims abstract description 11
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 170
- 239000000203 mixture Substances 0.000 claims description 45
- 239000010410 layer Substances 0.000 claims description 42
- 229920005989 resin Polymers 0.000 claims description 31
- 239000011347 resin Substances 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 24
- 239000000178 monomer Substances 0.000 claims description 18
- 239000003431 cross linking reagent Substances 0.000 claims description 17
- 238000004078 waterproofing Methods 0.000 claims description 15
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- 229920000515 polycarbonate Polymers 0.000 claims description 14
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- 238000004132 cross linking Methods 0.000 claims description 9
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- 230000005540 biological transmission Effects 0.000 claims description 5
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- 238000000691 measurement method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 35
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- GOXQRTZXKQZDDN-UHFFFAOYSA-N 2-Ethylhexyl acrylate Chemical compound CCCCC(CC)COC(=O)C=C GOXQRTZXKQZDDN-UHFFFAOYSA-N 0.000 description 8
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- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 4
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- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
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- 238000004381 surface treatment Methods 0.000 description 2
- 238000010345 tape casting Methods 0.000 description 2
- FKTHNVSLHLHISI-UHFFFAOYSA-N 1,2-bis(isocyanatomethyl)benzene Chemical compound O=C=NCC1=CC=CC=C1CN=C=O FKTHNVSLHLHISI-UHFFFAOYSA-N 0.000 description 1
- HECLRDQVFMWTQS-RGOKHQFPSA-N 1755-01-7 Chemical compound C1[C@H]2[C@@H]3CC=C[C@@H]3[C@@H]1C=C2 HECLRDQVFMWTQS-RGOKHQFPSA-N 0.000 description 1
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- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- OEPOKWHJYJXUGD-UHFFFAOYSA-N 2-(3-phenylmethoxyphenyl)-1,3-thiazole-4-carbaldehyde Chemical compound O=CC1=CSC(C=2C=C(OCC=3C=CC=CC=3)C=CC=2)=N1 OEPOKWHJYJXUGD-UHFFFAOYSA-N 0.000 description 1
- 125000000954 2-hydroxyethyl group Chemical group [H]C([*])([H])C([H])([H])O[H] 0.000 description 1
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Images
Landscapes
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
Description
本発明は、防水用両面粘着テープ及び携帯情報端末機器に関する。 The present invention relates to a waterproof double-sided pressure-sensitive adhesive tape and a portable information terminal device.
携帯電話、タブレット、音楽プレイヤー等の携帯情報端末機器においては、情報表示部と筐体、カメラ周り、キーパッド等の様々な箇所の固定に両面粘着テープが使用される。 In portable information terminal devices such as mobile phones, tablets, and music players, double-sided adhesive tape is used for fixing various portions such as an information display unit and a casing, a camera periphery, and a keypad.
近年の携帯情報端末機器では、デザイン性及び機能面の要求から、情報表示部が大きいものが増えており、それに伴い情報表示部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。このような情報表示部の固定に用いられる両面テープは、２ｍｍ幅以下の狭額縁状形態で使用される場合がある。また、近年の携帯情報端末機器の機能の一つとして防水性能の付与が求められる場合がある。 In recent portable information terminal devices, the number of information display units is increasing due to demands on design and functionality, and accordingly, the frame portion around the information display unit is designed to be as narrow as possible. The double-sided tape used for fixing such an information display unit may be used in a narrow frame shape with a width of 2 mm or less. In addition, as one of the functions of recent portable information terminal devices, it may be required to provide waterproof performance.
例えば、特許文献１には、発泡体基材と粘着剤層とを有する両面粘着テープが記載されている。特許文献１に記載された両面粘着テープは、ポリオレフィン系の発泡体基材とアクリル系の粘着剤を有している。基材が発泡していることにより、被着体と粘着剤が界面で強固に接合している。また、発泡体基材が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無く、防水性を発揮している。 For example, Patent Document 1 describes a double-sided pressure-sensitive adhesive tape having a foam base material and a pressure-sensitive adhesive layer. The double-sided pressure-sensitive adhesive tape described in Patent Document 1 has a polyolefin-based foam base material and an acrylic pressure-sensitive adhesive. Since the base material is foamed, the adherend and the adhesive are firmly bonded at the interface. Moreover, since the 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.
また、特許文献２には、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からなる両面粘着テープであって、（ａ）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、（ｂ）前記２つの粘着剤層が、それぞれ（メタ）アクリル酸エステル共重合体と、この共重合体１００質量部に対して、粘着付与樹脂１〜６０質量部を含むと共に、架橋剤を含む粘着剤組成物を熱架橋してなるものであること、を特徴とする両面粘着テープが記載されている。 Patent Document 2 discloses a double-sided pressure-sensitive adhesive tape comprising a laminate having a core material and pressure-sensitive adhesive layers provided on both sides thereof, and (a) the core material has a 5% tensile stress of 3 to 100 N. And the bending resistance (Gurley method) is 0.2 mN or less, (b) the two pressure-sensitive adhesive layers are each a (meth) acrylate copolymer and 100 parts by mass of this copolymer. On the other hand, there is described a double-sided pressure-sensitive adhesive tape characterized by comprising 1 to 60 parts by mass of a tackifier resin and thermally crosslinking a pressure-sensitive adhesive composition containing a crosslinking agent.
しかしながら、特許文献１に記載された両面粘着テープでは、特にテープ幅が１ｍｍ程度の非常に狭い幅になった場合、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、十分な防水性が達成できない場合がある。 However, in the double-sided pressure-sensitive adhesive tape described in Patent Document 1, particularly when the tape width becomes a very narrow width of about 1 mm, a sufficient bubble wall of closed cells for controlling water penetration is secured in the width direction. May not be possible, and sufficient waterproofness may not be achieved.
一方、特許文献２に記載された両面粘着テープは、基材として発泡体構造ではないものを使用することにより、テープ幅が１ｍｍ程度の非常に狭い幅になった場合であっても、十分な防水性を達成しやすい傾向にある。しかしながら、特許文献２に記載された両面粘着テープは、耐衝撃性（衝撃を与えた場合に両面粘着テープの粘着剤層が被着体から剥離しない性能）に改良の余地がある。 On the other hand, the double-sided pressure-sensitive adhesive tape described in Patent Document 2 is sufficient even when the tape width becomes a very narrow width of about 1 mm by using a base material that does not have a foam structure. It tends to be easy to achieve waterproofness. However, the double-sided pressure-sensitive adhesive tape described in Patent Document 2 has room for improvement in impact resistance (performance in which the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive tape does not peel from the adherend when an impact is applied).
そこで、本発明は、１ｍｍ程度の非常に狭いテープ幅で使用した場合であっても防水性が高く、耐衝撃性にも優れる、防水用両面粘着テープを提供することを目的とする。 Accordingly, an object of the present invention is to provide a waterproof double-sided pressure-sensitive adhesive tape that is highly waterproof and excellent in impact resistance even when used with a very narrow tape width of about 1 mm.
本発明は以下の通りである。
（１）発泡体構造では無い芯材と、前記芯材の両面に積層された粘着剤層とを備え、ＪＩＳ Ｋ７１０６：１９９５に準拠して測定した前記芯材の曲げこわさが３０〜１０７ＭＰａであり、ＪＩＳ Ｋ７２４４−６：１９９９（ＩＳＯ６７２１−６：１９９６）に準拠して測定した０℃における前記粘着剤層の貯蔵弾性率が０．３ＭＰａ以下である、防水用両面粘着テープ。
（２）前記芯材が、オレフィン系単量体単位６０〜１００質量％を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である、（１）に記載の防水用両面粘着テープ。
（３）前記オレフィン系重合体が、エチレン−メタクリル酸共重合体である、（２）に記載の防水用両面粘着テープ。
（４）前記粘着剤層が、（メタ）アクリル酸エステル共重合体と、前記（メタ）アクリル酸エステル共重合体１００質量部に対して１０質量部以上の粘着付与樹脂と、架橋剤とを含む粘着剤組成物を架橋してなるものである、（１）〜（３）のいずれかに記載の防水用両面粘着テープ。
（５）下記の測定方法により測定した２３℃における耐衝撃性が１０回以上である、（１）〜（４）のいずれかに記載の防水用両面粘着テープ。
（測定方法）
縦１５０ｍｍ×横７０ｍｍ×厚さ２ｍｍのポリカーボネート板、及び縦１５０ｍｍ×横７０ｍｍ×厚さ２ｍｍのポリカーボネート板を、幅２ｍｍの額縁状に打ち抜いた縦６０ｍｍ×横４０ｍｍ×厚さ２００μｍの前記防水用両面粘着テープで貼り合わせた後、高さ１５０ｃｍからステンレス床上に繰り返し落下させ、前記防水用両面粘着テープと前記ポリカーボネート板の少なくとも１部が剥離するのに要した落下の回数から１を減じた回数を耐衝撃性とする。
（６）ＪＩＳ Ｋ７１２９：２００８に準拠して測定した水蒸気透過率が１５ｇ／ｍ２／日以下である、（１）〜（５）のいずれかに記載の防水用両面粘着テープ。
（７）前記芯材の厚さが２〜４００μｍであり、前記芯材の両面に積層された前記粘着剤層の厚さがそれぞれ２〜１００μｍである、（１）〜（６）のいずれかに記載の防水用両面粘着テープ。
（８）０．１〜２ｍｍ幅の額縁状に打ち抜かれてなる形態を有する、（１）〜（７）のいずれかに記載の防水用両面粘着テープ。
（９）携帯情報端末機器内部の固定用として用いられる、（１）〜（８）のいずれかに記載の防水用両面粘着テープ。
（１０）（１）〜（９）のいずれかに記載の防水用両面粘着テープにより固定された部材を備える携帯情報端末機器。
The present invention is as follows.
(1) A core material not having a foam structure and an adhesive layer laminated on both surfaces of the core material, and the bending stiffness of the core material measured in accordance with JIS K7106: 1995 is 30 to 107 MPa. The double-sided adhesive tape for waterproofing whose storage elastic modulus of the said adhesive layer in 0 degreeC measured based on JISK7244-6: 1999 (ISO6721-6: 1996) is 0.3 Mpa or less.
(2) The waterproof double-sided pressure-sensitive adhesive tape according to (1), wherein the core material is a film formed using an olefin polymer having 60 to 100% by mass of an olefin monomer unit.
(3) The waterproof double-sided pressure-sensitive adhesive tape according to (2), wherein the olefin polymer is an ethylene-methacrylic acid copolymer.
(4) The pressure-sensitive adhesive layer comprises (meth) acrylic acid ester copolymer, 10 parts by mass or more of a tackifying resin with respect to 100 parts by mass of the (meth) acrylic acid ester copolymer, and a crosslinking agent. The waterproof double-sided pressure-sensitive adhesive tape according to any one of (1) to (3), wherein the pressure-sensitive adhesive composition is crosslinked.
(5) The waterproof double-sided pressure-sensitive adhesive tape according to any one of (1) to (4), wherein the impact resistance at 23 ° C. measured by the following measurement method is 10 times or more.
(Measuring method)
150 mm long × 70 mm wide × 2 mm thick polycarbonate plate and 150 mm long × 70 mm wide × 2 mm thick polycarbonate plate punched into a frame shape with a width of 2 mm 60 mm long × 40 mm wide × 200 μm thick for both sides for waterproofing After pasting together with adhesive tape, it is repeatedly dropped onto a stainless steel floor from a height of 150 cm, and 1 is subtracted from the number of drops required to peel off at least one part of the waterproof double-sided adhesive tape and the polycarbonate plate. Impact resistant.
(6) The waterproof double-sided pressure-sensitive adhesive tape according to any one of (1) to (5), wherein the water vapor transmission rate measured in accordance with JIS K7129: 2008 is 15 g / m 2 / day or less.
(7) The thickness of the core material is 2 to 400 μm, and the thickness of the pressure-sensitive adhesive layer laminated on both surfaces of the core material is 2 to 100 μm, respectively (1) to (6) 2. Double-sided adhesive tape for waterproofing.
(8) The waterproof double-sided pressure-sensitive adhesive tape according to any one of (1) to (7), wherein the waterproof double-sided pressure-sensitive adhesive tape has a form punched into a frame shape having a width of 0.1 to 2 mm.
(9) The waterproof double-sided pressure-sensitive adhesive tape according to any one of (1) to (8), which is used for fixing inside a portable information terminal device.
(10) A portable information terminal device comprising a member fixed by the waterproof double-sided adhesive tape according to any one of (1) to (9).
本発明によれば、１ｍｍ程度の非常に狭いテープ幅で使用した場合であっても防水性が高く、耐衝撃性にも優れる、防水用両面粘着テープを提供することができる。 According to the present invention, it is possible to provide a waterproof double-sided pressure-sensitive adhesive tape that is highly waterproof and excellent in impact resistance even when used with a very narrow tape width of about 1 mm.
＜防水用両面粘着テープ＞
１実施形態において、本発明は、発泡体構造では無い芯材と、前記芯材の両面に積層された粘着剤層とを備え、ＪＩＳ Ｋ７１０６：１９９５に準拠して測定した前記芯材の曲げこわさが３０〜１０７ＭＰａであり、ＪＩＳ Ｋ７２４４−６：１９９９に準拠して測定した０℃における前記粘着剤層の貯蔵弾性率が０．３ＭＰａ以下である、防水用両面粘着テープを提供する。
<Waterproof double-sided adhesive tape>
In one embodiment, the present invention includes a core material not having a foam structure, and an adhesive layer laminated on both surfaces of the core material, and the bending stiffness of the core material measured in accordance with JIS K7106: 1995. Is a double-sided pressure-sensitive adhesive tape for waterproofing, wherein the storage elastic modulus of the pressure-sensitive adhesive layer at 0 ° C. measured in accordance with JIS K7244-6: 1999 is 0.3 MPa or less.
後述するように、本実施形態の防水用両面粘着テープは、１ｍｍ程度の非常に狭いテープ幅で使用した場合であっても防水性が高く、耐衝撃性にも優れる。また、特に、線膨張係数の異なる材料同士を貼り合わせた場合や、熱等により変形しやすい材料を貼り合わせた場合においても被着体の浮き剥がれの発生が低減されている。 As will be described later, the waterproof double-sided pressure-sensitive adhesive tape of this embodiment has high waterproofness and excellent impact resistance even when used with a very narrow tape width of about 1 mm. In particular, even when materials having different linear expansion coefficients are bonded together, or when materials that are easily deformed by heat or the like are bonded together, the occurrence of floating of the adherend is reduced.
［芯材］
本実施形態の防水用両面粘着テープを構成する芯材は、本発明の効果が得られる限り特に制限されず、従来公知の合成樹脂製フィルムから適宜選択して用いることができる。
[Core]
The core material constituting the waterproof double-sided pressure-sensitive adhesive tape of the present embodiment is not particularly limited as long as the effect of the present invention is obtained, and can be appropriately selected from conventionally known synthetic resin films.
合成樹脂製フィルムとしては、オレフィン系単量体単位を、例えば６０〜１００質量％、例えば７０〜９７質量％、例えば８０〜９４質量％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が挙げられる。 Examples of the synthetic resin film include a film formed by using an olefin polymer containing 60 to 100% by mass, for example 70 to 97% by mass, for example 80 to 94% by mass, of an olefin monomer unit. It is done.
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等が挙げられる。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。 Specific examples of such an olefin polymer include an ethylene-methacrylic acid copolymer and an ethylene-vinyl acetate copolymer. One of these olefin polymers may be used alone, or two or more thereof may be used in combination.
芯材を構成する合成樹脂製フィルムは、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、酸化法や凹凸化法等により、表面処理、あるいはプライマー処理を施すことができる。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・紫外線照射処理等が挙げられる。凹凸化法としては、例えば、サンドブラスト法、溶剤処理法等が挙げられる。 The synthetic resin film constituting the core material is subjected to surface treatment or primer treatment on both sides by an oxidation method or an uneven surface method, etc., if desired, for the purpose of improving the adhesion with the adhesive layer provided on both sides. Can be applied. 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. Examples of the unevenness method include a sand blast method and a solvent treatment method.
表面処理法は、合成樹脂製フィルムの種類に応じて適宜選択すればよく、一般にはコロナ放電処理法が効果及び操作性等の面から、好ましく用いられる。 The surface treatment method may be appropriately selected according to the type of the synthetic resin film, and the corona discharge treatment method is generally preferably used from the viewpoints of effects and operability.
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が、特に携帯情報端末機器内部の固定用に使用する場合は黒色であることが好ましい。 There is no particular limitation on the color of the core material, and it may be colorless or colored in an appropriate color, but it should be black when used for fixing inside a portable information terminal device. Is preferred.
芯材は発泡体構造では無い必要がある。発泡体構造を有する芯材を使用した防水用両面テープでは、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場合がある。 The core material must not have a foam structure. In the waterproof double-sided tape using a core material having a foam structure, there may be a case where a bubble wall of closed cells for controlling water penetration cannot be sufficiently secured in the width direction.
芯材の厚さは、例えば２〜４００μｍであってもよく、例えば１０〜３００μｍであってもよく、例えば５０〜２００μｍであってもよい。芯材の厚さがこの範囲であると、防水用両面粘着テープの段差への貼合適性及び加工性が良好になる傾向にある。 The thickness of the core material may be, for example, 2 to 400 μm, may be, for example, 10 to 300 μm, and may be 50 to 200 μm, for example. When the thickness of the core material is within this range, the suitability for bonding to the step of the waterproof double-sided pressure-sensitive adhesive tape and the workability tend to be good.
（曲げこわさ）
曲げこわさとは、芯材の柔軟性を示す物性値であり、数値が小さいほど柔らかな樹脂であることを表す。曲げこわさは、例えば、ＪＩＳ Ｋ７１０６：１９９５（又はＡＳＴＭ Ｄ−７４７）に準拠して測定することができる。例えば、東洋精機製作所製のオートマチックスティフネステスタを使用し、２３℃における曲げこわさを測定するとよい。
(Bending stiffness)
Bending stiffness is a physical property value indicating the flexibility of the core material, and the smaller the value, the softer the resin. The bending stiffness can be measured based on, for example, JIS K7106: 1995 (or ASTM D-747). For example, an automatic stiffness tester manufactured by Toyo Seiki Seisakusho may be used to measure the bending stiffness at 23 ° C.
本実施形態の防水用両面粘着テープにおいて、ＪＩＳ Ｋ７１０６：１９９５に準拠して測定した芯材の曲げこわさは３０〜１０７ＭＰａであり、例えば５０〜１０５ＭＰａであってもよく、例えば５３〜１００ＭＰａであってもよい。 In the waterproof double-sided pressure-sensitive adhesive tape of the present embodiment, the bending stiffness of the core material measured in accordance with JIS K7106: 1995 is 30 to 107 MPa, for example, 50 to 105 MPa, for example, 53 to 100 MPa. Also good.
芯材の曲げこわさが上記の範囲であると、耐衝撃性に優れる防水用両面粘着テープが得られやすい傾向があり、また、浮き剥がれも発生しにくい傾向がある。また、芯材の曲げこわさが上記の範囲であると、芯材に粘着剤層を塗工する場合等にも取り扱い性が良好であり、例えば防水用両面粘着テープを幅１ｍｍ以下等の狭幅に抜き加工する場合等にも良好な加工性が得られやすい傾向にある。 When the bending stiffness of the core material is in the above range, a waterproof double-sided pressure-sensitive adhesive tape excellent in impact resistance tends to be obtained, and there is a tendency that floating and peeling do not easily occur. Moreover, when the bending stiffness of the core material is in the above range, the handleability is good even when an adhesive layer is applied to the core material. For example, a double-sided adhesive tape for waterproofing has a narrow width of 1 mm or less. Good workability tends to be easily obtained even when punching.
［耐衝撃性］
耐衝撃性とは、衝撃を与えた場合に両面粘着テープの粘着剤層が被着体から剥離しない性能であり、例えば、次のような方法により評価することができる。
[Shock resistance]
The impact resistance is a performance that prevents the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive tape from peeling off from the adherend when an impact is applied. For example, the impact resistance can be evaluated by the following method.
まず、図１に示すような測定用サンプルを作製する。図１（ａ）は、測定用サンプルの平面図である。図１（ｂ）は、図１（ａ）におけるＡ−Ａ線断面図である。図１（ｃ）は、図１（ａ）におけるＢ−Ｂ線断面図である。 First, a measurement sample as shown in FIG. 1 is prepared. FIG. 1A is a plan view of a measurement sample. FIG.1 (b) is the sectional view on the AA line in Fig.1 (a). FIG.1 (c) is the BB sectional view taken on the line in Fig.1 (a).
具体的には、例えば、本実施形態の防水用両面粘着テープを、外形寸法が縦６０ｍｍ×横４０ｍｍ×厚さ２００μｍで、幅が２ｍｍの額縁状に打ち抜いたもの（両面粘着テープ１２０）を使用して、縦１５０ｍｍ×横７０ｍｍ×厚さ２ｍｍのポリカーボネート板１１０、及び縦１５０ｍｍ×横７０ｍｍ×厚さ２ｍｍのポリカーボネート板１３０を貼り合わせた測定用サンプル１００を作製する。なお、図１（ａ）では、ポリカーボネート板１１０を除去した測定用サンプル１００の平面図が示されている。
Specifically, for example, the waterproof double-sided pressure-sensitive adhesive tape of the present embodiment is punched into a frame shape having an outer dimension of 60 mm in length, 40 mm in width, 200 μm in thickness and 2 mm in width (double-sided pressure-sensitive adhesive tape 120). Then, the
続いて、測定用サンプル１００を、高さ１５０ｃｍからステンレス床上に繰り返し落下させる。そして、防水用両面粘着テープ１２０とアクリル板１１０又はポリカーボネート板１３０の少なくとも１部が剥離するのに要した落下の回数から１を減じた回数を耐衝撃性とすればよい。
Subsequently, the
本実施形態の防水用両面粘着テープは、上記の測定方法により測定した２３℃における耐衝撃性が１０回以上であってもよい。 The waterproof double-sided pressure-sensitive adhesive tape of this embodiment may have an impact resistance at 23 ° C. measured by the measurement method of 10 times or more.
［防水性］
防水性は、例えば、ＪＩＳ Ｃ０９２０：２００３に準拠して評価することができる。あるいは、ＪＩＳ Ｋ７１２９：２００８（又はＡＳＴＭ（アメリカ材料試験協会規格）Ｅ３９８−０３）に準拠して、４０℃、相対湿度９０％の環境下において測定した水蒸気透過率に基づいて評価することができる。
[Waterproof]
The waterproof property can be evaluated based on, for example, JIS C0920: 2003. Or it can evaluate based on the water-vapor-permeation rate measured in 40 degreeC and 90% of relative humidity environment based on JISK7129: 2008 (or ASTM (American Society for Testing and Materials Standard) E398-03).
本実施形態の防水用両面粘着テープにより固定された部材を備える機器は、ＪＩＳ Ｃ０９２０（２００３）に準拠して評価した防水性がＩＰＸ５及びＩＰＸ７を満たすことができる。 The device including the member fixed by the waterproof double-sided pressure-sensitive adhesive tape of the present embodiment can satisfy IPX5 and IPX7 in waterproofness evaluated in accordance with JIS C0920 (2003).
また、本実施形態の防水用両面粘着テープは、ＪＩＳ Ｋ７１２９：２００８に準拠して測定した水蒸気透過率が、例えば１５ｇ／ｍ２／日以下であり、例えば１０ｇ／ｍ２／日以下であってもよい。 Further, the waterproof double-sided pressure-sensitive adhesive tape of the present embodiment has a water vapor permeability measured in accordance with JIS K7129: 2008, for example, 15 g / m 2 / day or less, for example, 10 g / m 2 / day or less. Also good.
［浮き剥がれ］
浮き剥がれの発生（浮き量）は、例えば、次のような方法により評価することができる。
[Floating off]
Generation | occurrence | production (floating amount) of floating peeling can be evaluated by the following methods, for example.
まず、線膨張係数の異なる２種類の材質の板を本実施形態の両面粘着テープで貼り合わせて、図１に示した測定用サンプル１００と同様な測定用サンプルを作製する。具体的には、例えば、本実施形態の両面粘着テープを、外形寸法が縦１４０ｍｍ×横６０ｍｍ×厚さ２００μｍで、幅が２ｍｍの額縁状に打ち抜いたものを使用して、縦１５０ｍｍ×横７０ｍｍ×厚さ２ｍｍのガラス板、及び縦１５０ｍｍ×横７０ｍｍ×厚さ２ｍｍのポリプロピレン製の板を貼り合わせた測定用サンプルを作製する。なお、ガラスの線膨張係数は約９×１０−６／℃であり、ポリプロピレンの線膨張係数は約１００〜１２０×１０−６／℃である。
First, two types of plates having different linear expansion coefficients are bonded to each other with the double-sided pressure-sensitive adhesive tape of the present embodiment to produce a measurement sample similar to the
続いて、この測定用サンプルを、例えば、６０℃、相対湿度９５％の耐久環境下で１〜７日間耐久処理し、下記式（１）によって測定用サンプルの四隅の浮き量を測定する。測定された浮き量の平均値に基づいて、浮き剥がれの発生を評価することができる。
浮き量（μｍ）＝耐久処理後の測定用サンプルの厚み−耐久処理前の測定用サンプルの厚み （１）
Subsequently, the measurement sample is subjected to endurance treatment for 1 to 7 days in an endurance environment of, for example, 60 ° C. and a relative humidity of 95%, and the floating amounts at the four corners of the measurement sample are measured by the following equation (1). Based on the measured average value of the floating amount, the occurrence of floating peeling can be evaluated.
Floating amount (μm) = Thickness of measurement sample after endurance treatment−Thickness of measurement sample before endurance treatment (1)
本実施形態の防水用両面粘着テープは、上述した方法により、６０℃、相対湿度９５％の耐久環境下で５日間耐久処理を行った場合の浮き剥がれが、例えば１００μｍ以下であり、例えば５０μｍ以下であり、例えば１０μｍ以下である。 The waterproof double-sided pressure-sensitive adhesive tape of the present embodiment has a lift-off of, for example, 100 μm or less, for example, 50 μm or less when the durability treatment is performed for 5 days in a durable environment of 60 ° C. and 95% relative humidity by the above-described method. For example, it is 10 μm or less.
［粘着剤層］
本実施形態の防水用両面粘着テープを構成する粘着剤層は、ＪＩＳ Ｋ７２４４−６：１９９９に準拠して測定した０℃における前記粘着剤層の貯蔵弾性率が０．３ＭＰａ以下であれば特に制限されず、従来両面粘着テープの粘着剤層として慣用されているものの中から適宜選択して用いることができる。
[Adhesive layer]
The pressure-sensitive adhesive layer constituting the waterproof double-sided pressure-sensitive adhesive tape of this embodiment is particularly limited if the storage elastic modulus of the pressure-sensitive adhesive layer at 0 ° C. measured in accordance with JIS K7244-6: 1999 is 0.3 MPa or less. However, it can be appropriately selected from those conventionally used as the pressure-sensitive adhesive layer of the double-sided pressure-sensitive adhesive tape.
粘着剤層の貯蔵弾性率は、例えばレオメータ（型式「ＭＣＲ３００」、Ｐｈｙｓｉｃａ社製）を使用して測定することができる。粘着剤層の貯蔵弾性率は、粘着剤組成物を架橋させて貯蔵弾性率測定用のサンプルを作製し、このサンプルを用いて測定してもよい。あるいは、溶剤を用いて両面粘着テープから粘着剤層を溶解させて回収後、溶剤を除去することにより得られる粘着剤層をサンプルとして用いて測定することもできる。粘着剤層を一度溶剤で溶解させた場合においても、貯蔵弾性率の測定値にはほとんど影響がない。 The storage elastic modulus of the pressure-sensitive adhesive layer can be measured using, for example, a rheometer (model “MCR300”, manufactured by Physica). The storage elastic modulus of the pressure-sensitive adhesive layer may be measured by preparing a sample for measuring storage elastic modulus by crosslinking the pressure-sensitive adhesive composition. Alternatively, the pressure-sensitive adhesive layer can be measured by dissolving the pressure-sensitive adhesive layer from the double-sided pressure-sensitive adhesive tape using a solvent and recovering it, and then removing the solvent as a sample. Even when the pressure-sensitive adhesive layer is once dissolved with a solvent, the measured value of the storage elastic modulus is hardly affected.
０℃における粘着剤層の貯蔵弾性率は、例えば０超０．２５以下であってもよく、０超０．２以下であってもよく、０超０．１５以下であってもよい。 The storage elastic modulus of the pressure-sensitive adhesive layer at 0 ° C. may be, for example, more than 0 and 0.25 or less, more than 0 and 0.2 or less, or more than 0 and 0.15 or less.
０℃における粘着剤層の貯蔵弾性率が上記の範囲である粘着剤層を、上述した芯材と組み合わせることにより、優れた耐衝撃性を示す防水用両面粘着テープを得ることができる。 A waterproof double-sided pressure-sensitive adhesive tape exhibiting excellent impact resistance can be obtained by combining a pressure-sensitive adhesive layer having a storage elastic modulus at 0 ° C. in the above range with the above-described core material.
粘着剤層は、（メタ）アクリル酸エステル共重合体と、この共重合体１００質量部に対して、１０質量部以上の粘着付与樹脂と、架橋剤とを含む粘着剤組成物を架橋して形成されたものであってもよい。 The pressure-sensitive adhesive layer is formed by crosslinking a pressure-sensitive adhesive composition containing a (meth) acrylic acid ester copolymer and 10 parts by mass of a tackifier resin and a crosslinking agent with respect to 100 parts by mass of the copolymer. It may be formed.
上記の粘着剤組成物の架橋は、加熱又は活性エネルギー線の照射により行うことができる。活性エネルギー線としては、紫外線、赤外線等の光線、α線、β線、γ線、電子線、中性子線、Ｘ線等の放射線等が挙げられる。 Crosslinking of the pressure-sensitive adhesive composition can be performed by heating or irradiation with active energy rays. Examples of active energy rays include rays such as ultraviolet rays and infrared rays, and radiations such as α rays, β rays, γ rays, electron rays, neutron rays, and X rays.
本実施形態の防水用両面粘着テープにおいて、芯材の一方面及び他方面に存在する２つの粘着剤層は、それぞれ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であることが好ましい。 In the waterproof double-sided pressure-sensitive adhesive tape of the present embodiment, the two pressure-sensitive adhesive layers present on the one surface and the other surface of the core material may have the same composition and properties, or have different compositions and properties. However, from the viewpoint of productivity, it is preferable to have the same composition and properties.
（（メタ）アクリル酸エステル共重合体）
（メタ）アクリル酸エステル共重合体としては、本発明の効果が得られる限り特に制限はなく、従来アクリル系粘着剤の主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又はアクリル酸エステルを意味する。
((Meth) acrylic acid ester copolymer)
The (meth) acrylic acid ester copolymer is not particularly limited as long as the effects of the present invention can be obtained, and among the (meth) acrylic acid ester copolymers conventionally used as the main component of acrylic pressure-sensitive adhesives. Any one can be appropriately selected and used. 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 or acrylic acid ester.
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、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、オクチル（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）アクリレート等が挙げられる。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 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, isopropyl (meth) acrylate, butyl ( (Meth) acrylate, isobutyl (meth) acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, isooctyl (meth) acrylate, decyl ( Examples include 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.
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）アクリレート等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）アクリレート等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、シトラコン酸等のエチレン性不飽和カルボン酸等が挙げられる。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。 Examples of monomers having a functional group having active hydrogen include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) Acrylate, hydroxyalkyl (meth) acrylate such as 3-hydroxybutyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, monomethylaminoethyl (meth) acrylate, monoethylaminoethyl (meth) acrylate, monomethylaminopropyl (meth) ) Monoalkylaminoalkyl (meth) acrylates such as acrylates and monoethylaminopropyl (meth) acrylates; ethylenic polymers such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid and citraconic acid It includes sums carboxylic acid. 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等のビニルエステル類；エチレン、プロピレン、イソブチレン等のオレフィン類；塩化ビニル、ビニリデンクロリド等のハロゲン化オレフィン類；スチレン、α−メチルスチレン等のスチレン系単量体；ブタジエン、イソプレン、クロロプレン等のジエン系単量体；アクリロニトリル、メタクリロニトリル等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等のアクリルアミド類等が挙げられる。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 monomers such as styrene and α-methylstyrene; Diene monomers such as butadiene, isoprene and chloroprene; Nitrile monomers such as acrylonitrile and methacrylonitrile; Acrylamide, N-methylacrylamide, N, N -Acrylamides such as dimethylacrylamide. These may be used alone or in combination of two or more.
（メタ）アクリル酸エステル共重合体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、及び耐久接着性等を考慮すると、重量平均分子量は６０万〜１８０万であることが好ましい。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。 There is no restriction | limiting in particular about the copolymerization form of a (meth) acrylic acid ester copolymer, Any of a random, a block, and a graft copolymer may be sufficient. 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. Considering adhesiveness, durable adhesiveness, etc., the weight average molecular weight is preferably 600,000 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.
（メタ）アクリル酸エステル共重合体を基準とした、活性水素をもつ官能基を有する単量体単位の含有量は、例えば０．０１〜１０質量％であり、例えば０．０５〜６．０質量％であり、例えば０．２〜５．０質量％である。０．０１質量％以上であれば、架橋点を十分に確保することができるため十分な架橋を得ることができ、粘着剤層の凝集破壊を抑制することができる傾向にあり、１０質量％以下であれば、粘着剤組成物の粘度が適度であり、塗工適性も良好である。 The content of the monomer unit having a functional group having active hydrogen based on the (meth) acrylic acid ester copolymer is, for example, 0.01 to 10% by mass, for example, 0.05 to 6.0. For example, 0.2 to 5.0% by mass. If it is 0.01% by mass or more, a sufficient crosslinking can be obtained because a sufficient crosslinking point can be secured, and cohesive failure of the pressure-sensitive adhesive layer tends to be suppressed. If so, the viscosity of the pressure-sensitive adhesive composition is moderate, and the coating suitability is also good.
（粘着付与樹脂）
粘着付与剤としては、特に限定されず、水添石油樹脂（例えばジシクロペンタジエン等）、ロジン、ロジン誘導体（例えばロジンのグリセリンエステル、水添ロジン、水添ロジンのグリセリンエステル、ロジンのペンタエリストールエステル等）、テルペン樹脂、水添テルペン樹脂、テルペンフェノール樹脂、変性テルペン樹脂、液状樹脂、樹脂エマルジョン、アルキルフェノール樹脂、石炭酸樹脂、酢酸ビニル系樹脂等が挙げられる。
(Tackifying resin)
The tackifier is not particularly limited, and is a hydrogenated petroleum resin (for example, dicyclopentadiene), rosin, rosin derivative (for example, glycerin ester of rosin, hydrogenated rosin, glycerin ester of hydrogenated rosin, pentaerythritol of rosin) Esters), terpene resins, hydrogenated terpene resins, terpene phenol resins, modified terpene resins, liquid resins, resin emulsions, alkylphenol resins, carboxylic acid resins, vinyl acetate resins, and the like.
これらの粘着付与樹脂は１種のみを単独で用いてもよく、２種以上を組み合わせて用いてもよい。粘着剤層が粘着付与樹脂を含有することにより、防水用両面粘着テープの凹凸追従性、接着性、加工適性、被着体との密着性が向上する傾向にある。 These tackifier resins may be used alone or in combination of two or more. When the pressure-sensitive adhesive layer contains a tackifying resin, the unevenness followability, adhesiveness, workability, and adhesion to the adherend of the waterproof double-sided pressure-sensitive adhesive tape tend to be improved.
粘着付与樹脂の含有量は、（メタ）アクリル酸エステル共重合体１００質量部に対して、例えば１０〜３０質量部であってもよく、例えば１５〜３０質量部であってもよく、例えば２０〜３０質量部であってもよい。粘着剤層に粘着付与樹脂を添加すると、粘着剤層の０℃における貯蔵弾性率が上昇する一方、粘着剤層と被着体との密着性が良好なものとなる傾向にある。粘着付与樹脂の含有量を上記の範囲とすることにより、０℃における貯蔵弾性率が高くなりすぎることなく粘着剤層と被着体との密着性を向上させ、耐衝撃性に優れる両面粘着テープが得られやすくなる。 The content of the tackifier resin may be, for example, 10 to 30 parts by mass, for example, 15 to 30 parts by mass, for example, 20 parts by mass with respect to 100 parts by mass of the (meth) acrylic acid ester copolymer. -30 mass parts may be sufficient. When tackifying resin is added to the pressure-sensitive adhesive layer, the storage elastic modulus at 0 ° C. of the pressure-sensitive adhesive layer is increased, while the adhesion between the pressure-sensitive adhesive layer and the adherend tends to be good. By setting the content of the tackifying resin in the above range, the double-sided pressure-sensitive adhesive tape is excellent in impact resistance by improving the adhesion between the pressure-sensitive adhesive layer and the adherend without excessively increasing the storage elastic modulus at 0 ° C. Becomes easier to obtain.
（架橋剤）
架橋剤としては、本発明の効果が得られる限り特に制限されず、従来アクリル系粘着剤組成物において架橋剤として慣用されているものの中から適宜選択して用いることができる。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、ポリイソシアネート化合物が好ましく用いられる。
(Crosslinking agent)
The crosslinking agent is not particularly limited as long as the effects of the present invention can be obtained, and can be appropriately selected from those conventionally used as crosslinking agents in acrylic pressure-sensitive adhesive compositions. Examples of the crosslinking agent include polyisocyanate compounds, epoxy resins, melamine resins, urea resins, dialdehydes, methylol polymers, aziridine compounds, metal chelate compounds, metal alkoxides, metal salts and the like, and polyisocyanate compounds are preferred. Used.
ポリイソシアネート化合物としては、例えば、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等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等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等の脂環式ポリイソシアネート等；これらのビウレット体；これらのイソシアヌレート体；これらと、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、ヒマシ油等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等が挙げられる。 Examples of the polyisocyanate compound include aromatic polyisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate and xylylene diisocyanate; aliphatic polyisocyanates such as hexamethylene diisocyanate; alicyclic polyisocyanates such as isophorone diisocyanate and hydrogenated diphenylmethane diisocyanate. These biuret bodies; these isocyanurate bodies; adduct bodies that are a reaction product of these with low-molecular active hydrogen-containing compounds such as ethylene glycol, propylene glycol, neopentyl glycol, trimethylolpropane, castor oil, etc. It is done.
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。架橋剤の使用量は、架橋剤の種類にもよるが、（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、例えば０．０１〜２０質量部であってもよく、例えば０．１〜１０質量部であってもよい。 A crosslinking agent may be used individually by 1 type, and may be used in combination of 2 or more type. Although the usage-amount of a crosslinking agent is based also on the kind of crosslinking agent, it may be 0.01-20 mass parts with respect to 100 mass parts of solid content of a (meth) acrylic acid ester copolymer, for example, is 0. It may be 1 to 10 parts by mass.
粘着剤組成物には、本発明の効果が得られる限り、例えば、シラン系カップリング剤、酸化防止剤、紫外線吸収剤、光安定剤、軟化剤、充填剤、着色剤等の各種添加剤を含有させることができる。 As long as the effects of the present invention are obtained, the pressure-sensitive adhesive composition includes various additives such as a silane coupling agent, an antioxidant, an ultraviolet absorber, a light stabilizer, a softening agent, a filler, and a colorant. It can be included.
本実施形態の防水用両面粘着テープにおいて、芯材の両面に設けられる２つの粘着剤層の厚さとしては特に限定されず、例えばそれぞれ２〜１００μｍであってもよく、例えばそれぞれ５〜８０μｍであってもよい。２μｍ以上であると凹凸追従性や被着体との密着性に優れる傾向にあり、１００μｍ以下であると加工性に優れる傾向にある。 In the waterproof double-sided pressure-sensitive adhesive tape of the present embodiment, the thickness of the two pressure-sensitive adhesive layers provided on both surfaces of the core material is not particularly limited, and may be, for example, 2 to 100 μm, for example, 5 to 80 μm. There may be. When it is 2 μm or more, it tends to be excellent in uneven followability and adhesion to an adherend, and when it is 100 μm or less, it tends to be excellent in workability.
［剥離シート］
本実施形態の防水用両面粘着テープは、搬送時や使用時の利便性から、粘着剤層上に剥離シートを積層したものであることが好ましい。本実施形態の防水用両面粘着テープが２枚の剥離シートに挟持された形態であってもよいし、本実施形態の防水用両面粘着テープを、両面に離型性を有する１枚の剥離シートに積層して、巻き取った形態であってもよい。
[Peeling sheet]
The waterproof double-sided pressure-sensitive adhesive tape of the present embodiment is preferably one in which a release sheet is laminated on the pressure-sensitive adhesive layer for convenience during transportation and use. The waterproof double-sided pressure-sensitive adhesive tape of the present embodiment may be sandwiched between two release sheets, or the waterproof double-sided pressure-sensitive adhesive tape of this embodiment may be separated from both sides with a single release sheet. It may be in the form of being laminated and wound up.
剥離シートとしては、種々のものを使用することができるが、代表的には、表面に剥離性を有する剥離シート用基材から構成されるものが挙げられる。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；上質紙、コート紙、グラシン紙、ラミネート紙等の紙類が挙げられる。 As the release sheet, various types can be used, and typically, a release sheet having a release sheet base material on the surface is exemplified. 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, and triacetyl cellulose; paper such as fine paper, coated paper, glassine paper, and laminate paper Is mentioned.
なかでも、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、例えば５〜３００μｍであってもよく、例えば１０〜２００μｍであってもよい。 Of these, a polyethylene terephthalate film that is inexpensive and firm is preferable. The thickness of the release sheet substrate may be, for example, 5 to 300 μm, for example, 10 to 200 μm.
剥離シート用基材の表面（剥離処理面）に剥離性を付与する方法としては、剥離シート用基材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を主成分とする剥離剤を塗布する方法が挙げられる。なかでも、安価で安定した性能が得られるシリコーン系樹脂を主成分とする剥離剤が好ましい。剥離剤層の厚さは、例えば０．０５〜２．０μｍであってもよく、０．１〜１．５μｍであってもよい。 As a method for imparting peelability to the surface of the release sheet substrate (release treatment surface), the surface of the release sheet substrate is mainly composed of a silicone resin, a fluorine resin, a long-chain alkyl group resin, or the like. The method of apply | coating a peeling agent is mentioned. Of these, a release agent mainly composed of a silicone-based resin capable of obtaining inexpensive and stable performance is preferable. The thickness of the release agent layer may be, for example, 0.05 to 2.0 μm or 0.1 to 1.5 μm.
本実施形態の防水用両面粘着テープの両面の粘着剤層上に、それぞれ剥離シートを積層する際には、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。以下、剥離力の小さいほうの剥離シートを軽剥離シートといい、剥離力の大きいほうの剥離シートを重剥離シートという場合がある。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ことを防ぐことができる。 When laminating release sheets on the double-sided pressure-sensitive adhesive layers of the waterproof double-sided pressure-sensitive adhesive tape of this embodiment, it is preferable to make a difference in the peel strength of the respective release sheets. Hereinafter, the release sheet having a smaller peel force may be referred to as a light release sheet, and the release sheet having a greater peel force may be referred to as a heavy 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 Can be prevented.
また、両面に離型性を有する１枚の剥離シートに、本実施形態の防水用両面粘着テープを積層して巻き取る場合においても、剥離シートの表裏で剥離力に差をつけておくことにより、同様の効果を得ることができる。 Moreover, even when laminating and winding the waterproof double-sided pressure-sensitive adhesive tape of this embodiment on a single release sheet having releasability on both sides, by making a difference in the peel strength between the front and back of the release sheet The same effect can be obtained.
［防水用両面粘着テープの製造方法］
次に、本実施形態の防水用両面粘着テープの製造方法について説明する。
[Method for producing waterproof double-sided adhesive tape]
Next, the manufacturing method of the waterproof double-sided adhesive tape of this embodiment is demonstrated.
まず、上述したアクリル系粘着剤組成物に、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。 First, a solvent is added to the above-described acrylic pressure-sensitive adhesive composition as necessary to adjust the viscosity to be suitable for coating, thereby preparing a coating solution.
次に、軽剥離シート（又は重剥離シート）の剥離処理面に、上記の塗工液を、乾燥後の膜厚が所望の厚さとなるように、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等の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〜数分間加熱乾燥して、粘着剤組成物を架橋させた後、これに芯材を貼合して片面粘着フィルムを作製する。 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, so that the film thickness after drying becomes a desired thickness, Coating is performed by a conventionally known coating method such as a knife coating method, a roll knife coating method, a gravure coating method, an air doctor coating method, a doctor blade coating method, and the like, and is heated at a temperature of about 80 to 120 ° C. for several tens of seconds to several minutes. After drying and cross-linking the pressure-sensitive adhesive composition, a core material is bonded thereto to produce a single-sided pressure-sensitive adhesive film.
次いで、重剥離シート（又は軽剥離シート）の剥離処理面に、上記の塗工液を、乾燥後の膜厚が所望の厚さとなるように、上記と同様にして塗工し、加熱乾燥して架橋させた後、上記の片面粘着フィルムの芯材面と貼合することにより、本実施形態の防水用両面粘着テープを製造することができる。 Next, the above-described coating liquid is applied to the release-treated surface of the heavy release sheet (or light release sheet) in the same manner as described above so that the film thickness after drying becomes a desired thickness, and heat-dried. After cross-linking, the waterproof double-sided pressure-sensitive adhesive tape of this embodiment can be produced by pasting with the core material surface of the above-mentioned single-sided pressure-sensitive adhesive film.
［防水用両面粘着テープの用途］
次に、本実施形態の防水用両面粘着テープの用途について説明する。
[Use of double-sided adhesive tape for waterproofing]
Next, the use of the waterproof double-sided pressure-sensitive adhesive tape of this embodiment will be described.
本実施形態の防水用両面粘着テープは、特定の性状を有する芯材フィルムの両面に、特定の性状を有するアクリル系粘着剤層を設けた積層体であって、例えば携帯電話やタッチパネル等のモバイル製品（携帯情報端末機器）における部材固定用、あるいは、携帯情報端末機器内部の固定用等として好適に用いることができる。本実施形態の防水用両面粘着テープは、段差への貼合適性、接着性及び耐水性に優れるため、狭額縁仕様の携帯情報端末機器に、防水用両面粘着テープ等として用いることができる。 The waterproof double-sided pressure-sensitive adhesive tape of this embodiment is a laminate in which an acrylic pressure-sensitive adhesive layer having a specific property is provided on both surfaces of a core film having a specific property, such as a mobile phone or a touch panel. It can be suitably used for fixing a member in a product (personal digital assistant device) or for fixing inside a portable information terminal device. Since the waterproof double-sided pressure-sensitive adhesive tape of this embodiment is excellent in bonding suitability to a step, adhesion, and water resistance, it can be used as a waterproof double-sided pressure-sensitive adhesive tape or the like in a narrow frame specification portable information terminal device.
本実施形態の防水用両面粘着テープは、芯材として、特定の性状を有する合成樹脂製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、例えば０．１〜２ｍｍの幅で、例えば０．２〜１ｍｍの幅で、防水用として用いることができる。本実施形態の防水用両面粘着テープは、許容される場合には、上記範囲よりも大きな幅で使用することもでき、その場合には、更に優れた段差への貼合適性、接着性及び耐水性を示す。 The waterproof double-sided pressure-sensitive adhesive tape of the present embodiment uses a synthetic resin film having specific properties as a core material, and therefore has no pores and is excellent in water resistance, for example, with a width of 0.1 to 2 mm. For example, it has a width of 0.2 to 1 mm and can be used for waterproofing. The waterproof double-sided pressure-sensitive adhesive tape of the present embodiment can be used in a width larger than the above range, if allowed, and in that case, the bonding ability to a further excellent step, adhesiveness and water resistance can be increased. Showing gender.
また、本実施形態の防水用両面粘着テープは、額縁状に打ち抜かれてなる形態を有していてもよく、両面に剥離シートが貼着されてなる額縁状形態としてもよい。 Moreover, the waterproof double-sided pressure-sensitive adhesive tape of the present embodiment may have a form that is punched into a frame shape, or a frame-like form in which a release sheet is attached to both sides.
また、本実施形態の防水用両面粘着テープは、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、防水用両面粘着テープが額縁状形態である場合、黒色のものが好ましい。芯材や粘着剤層の黒色化は、芯材や粘着剤層の材料に、カーボンブラック、あるいは黒色系の顔料や染料等を混入させることにより、行うことができる。 Moreover, the waterproof double-sided pressure-sensitive adhesive tape of the present embodiment can make any layer or all layers of the core material layer and the pressure-sensitive adhesive layer black. In particular, when the waterproof double-sided pressure-sensitive adhesive tape has a frame shape, 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 into the material of the core material or the pressure-sensitive adhesive layer.
＜携帯情報端末機器＞
１実施形態において、本発明は、上述した防水用両面粘着テープにより固定された部材を備える携帯情報端末機器を提供する。上記の部材としては、例えば情報表示部（タッチパネル）等が挙げられる。
<Mobile information terminal equipment>
In one embodiment, the present invention provides a portable information terminal device including a member fixed by the waterproof double-sided pressure-sensitive adhesive tape described above. As said member, an information display part (touch panel) etc. are mentioned, for example.
本実施形態の携帯情報端末機器は、上述した防水用両面粘着テープにより固定された部材が耐衝撃性に優れており、浮き剥がれの発生が低減されている。また、本実施形態の携帯情報端末機器は、ＪＩＳ Ｃ０９２０：２００３に準拠して評価した防水性がＩＰＸ５及びＩＰＸ７を満たし、水蒸気透過率も低いため、高い防水性能を示すことができる。 In the portable information terminal device of this embodiment, the member fixed by the waterproof double-sided pressure-sensitive adhesive tape described above has excellent impact resistance, and the occurrence of floating peeling is reduced. In addition, the portable information terminal device according to the present embodiment can exhibit high waterproof performance because the waterproofness evaluated in conformity with JIS C0920: 2003 satisfies IPX5 and IPX7 and the water vapor transmission rate is low.
次に実施例を示して本発明を更に詳細に説明するが、本発明は以下の実施例に限定されるものではない。 EXAMPLES Next, although an Example is shown and this invention is demonstrated further in detail, this invention is not limited to a following example.
＜評価方法＞
後述する、実施例及び比較例の防水用両面粘着テープについて、下記の方法にしたがって、諸特性を評価した。
<Evaluation method>
Various properties of the waterproof double-sided pressure-sensitive adhesive tapes of Examples and Comparative Examples described later were evaluated according to the following methods.
［曲げこわさ］
実施例及び比較例の防水用両面粘着テープに使用した芯材の曲げこわさを、ＪＩＳ Ｋ７１０６：１９９５に準じて、ステフネステスタ（東洋精機製作所製）を使用して測定した。
[Bending stiffness]
The bending stiffness of the core material used for the waterproof double-sided pressure-sensitive adhesive tapes of Examples and Comparative Examples was measured using a steph tester (manufactured by Toyo Seiki Seisakusho) according to JIS K7106: 1995.
［貯蔵弾性率］
実施例及び比較例の防水用両面粘着テープの粘着剤層の０℃における貯蔵弾性率を、ＪＩＳ Ｋ７２４４−６：１９９９に準じて、レオメータ（型式「ＭＣＲ３００」、Ｐｈｙｓｉｃａ社製）を使用して、周波数１Ｈｚで測定した。
[Storage modulus]
According to JIS K7244-6: 1999, the rheometer (model “MCR300”, manufactured by Physica) was used for the storage elastic modulus at 0 ° C. of the adhesive layer of the waterproof double-sided adhesive tape of Examples and Comparative Examples. Measurement was performed at a frequency of 1 Hz.
［耐衝撃性］
耐衝撃性は、次のようにして評価した。まず、図１（ａ）〜（ｃ）に示すように、実施例及び比較例の防水用両面粘着テープを、外形寸法が縦６０ｍｍ×横４０ｍｍ×厚さ２００μｍで、幅が２ｍｍの額縁状に打ち抜いたもの（両面粘着テープ１２０）を使用して、縦１５０ｍｍ×横７０ｍｍ×厚さ２ｍｍのポリカーボネート板１１０、及び縦１５０ｍｍ×横７０ｍｍ×厚さ２ｍｍのポリカーボネート板１３０を貼り合わせた測定用サンプル１００を作製した。続いて、この測定用サンプル１００を、高さ１５０ｃｍからステンレス床上に繰り返し落下させ、前記防水用両面粘着テープと前記ポリカーボネート板の少なくとも１部が剥離するのに要した落下の回数から１を減じた回数を耐衝撃性とした。
[Shock resistance]
The impact resistance was evaluated as follows. First, as shown in FIGS. 1A to 1C, the waterproof double-sided pressure-sensitive adhesive tapes of Examples and Comparative Examples have a frame shape having an outer dimension of 60 mm in length, 40 mm in width, 200 μm in thickness, and 2 mm in width.
［浮き量］
浮き量（浮き剥がれの発生）は、次のようにして評価した。図１に示した測定用サンプル１００と同様な測定用サンプルを作製した。実施例及び比較例の防水用両面粘着テープを、外形寸法が縦１４０ｍｍ×横６０ｍｍ×厚さ２００μｍで、幅が２ｍｍの額縁状に打ち抜いたものを使用して、縦１５０ｍｍ×横７０ｍｍ×厚さ２ｍｍのガラス板、及び縦１５０ｍｍ×横７０ｍｍ×厚さ２ｍｍのポリプロピレン製の板を貼り合わせた測定用サンプルを作製した。続いて、この測定用サンプルを、６０℃、相対湿度９０％の耐久環境下で、それぞれ５日間耐久処理し、下記式（１）によって測定用サンプルの四隅の浮き量の平均値を求めた。
浮き量（μｍ）＝耐久処理後の測定用サンプルの厚み−耐久処理前の測定用サンプルの厚み （１）
[Floating amount]
The floating amount (occurrence of floating peeling) was evaluated as follows. A measurement sample similar to the
Floating amount (μm) = Thickness of measurement sample after endurance treatment−Thickness of measurement sample before endurance treatment (1)
［防水性］
（ＩＰＸ５）
「ＪＩＳ Ｃ０９２０：２００３ １４．２．５ 直径６．３ｍｍノズルによる第二特性数字５に対する試験」に準じて防水性を評価した。図２は、測定用サンプル２００の平面図、図３は、上記平面図におけるＡ−Ａ線断面図、図４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２１０ａ及び２１０ｂを、外形寸法が縦６０ｍｍ×横４０ｍｍで幅が１ｍｍの額縁状に打ち抜いた両面粘着テープ２２０にて貼り合わせた測定用サンプル２００を作製した。測定用サンプルの一方のアクリル板２１０ａには高さ１０μｍ、幅５ｍｍの十字状の黒色印刷２３０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２１０ｂを使用した（図２〜図４参照）。測定用サンプル２００を作製し２４時間後に、内径６．３ｍｍの放水ノズルを用いて、測定用サンプルに対してランダムにあらゆる方向から毎分１２．５Ｌの放水率で５分間放水した後、目視にて測定用サンプル内部への水の浸入の有無を確認した。
[Waterproof]
(IPX5)
The waterproofness was evaluated according to “JIS C0920: 2003 14.2.5 Test for Second Characteristic Number 5 Using a Nozzle with a Diameter of 6.3 mm”. 2 is a plan view of the
（ＩＰＸ７）
ＩＰＸ５の試験に用いたものと同様の測定用サンプル２００を用いて、「ＪＩＳ Ｃ０９２０：２００３ １４．２．７ 深さ０.１５〜１ｍの一時的潜水状態での第二特性数字７に対する試験」に準じて防水性を評価した。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浸入の有無を確認した。
(IPX7)
Using a
［水蒸気透過率］
ＪＩＳ Ｋ７１２９：２００８（Ａ法）に準じて、水蒸気透過度計（ＬＹＳＳＹ社製、製品名「Ｌ８０−５０００」を使用し、セル温度４０℃、相対湿度差９０％ＲＨの条件下にて測定した。
[Water vapor transmission rate]
According to JIS K7129: 2008 (Method A), a water vapor transmission meter (manufactured by LYSSY, product name “L80-5000”) was used, and measurement was performed under conditions of a cell temperature of 40 ° C. and a relative humidity difference of 90% RH. .
＜芯材フィルムの作製＞
［製造例１］
エチレン−メタクリル酸共重合体（三井・デュポンケミカル社製「ニュクレルＡＮ４２２１Ｃ」、オレフィン系単量体単位８８質量％）を厚さ１００μｍに製膜し、両面にコロナ処理を施して製造例１の芯材フィルムを作製した。
<Preparation of core film>
[Production Example 1]
An ethylene-methacrylic acid copolymer (“Nucleel AN4221C” manufactured by Mitsui DuPont Chemical Co., Ltd., olefinic monomer unit 88% by mass) is formed to a thickness of 100 μm and subjected to corona treatment on both sides to produce the core of Production Example 1 A material film was prepared.
［製造例２］
エチレン−メタクリル酸共重合体（三井・デュポンケミカル社製「ニュクレルＡＮ４２１３Ｃ」、オレフィン系単量体単位８９質量％）を厚さ１００μｍに製膜し、両面にコロナ処理を施して製造例２の芯材フィルムを作製した。
[Production Example 2]
An ethylene-methacrylic acid copolymer (“Nucleel AN4213C” manufactured by Mitsui DuPont Chemical Co., Ltd., olefinic monomer unit 89% by mass) is formed into a film having a thickness of 100 μm and subjected to corona treatment on both sides to produce the core of Production Example 2 A material film was prepared.
［製造例３］
エチレン−メタクリル酸共重合体（三井・デュポンケミカル社製「ニュクレルＮ４１０」、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製造例３の芯材フィルムを作製した。
[Production Example 3]
An ethylene-methacrylic acid copolymer (“Nucleel N410” manufactured by Mitsui DuPont Chemical Co., Ltd., 91% by mass of an olefin monomer unit) is formed to a thickness of 100 μm, and subjected to corona treatment on both sides to produce the core of Production Example 3 A material film was prepared.
［製造例４］
エチレン−メタクリル酸共重合体（三井・デュポンケミカル社製「ニュクレルＮＣ９０３ＨＣ」、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製造例４の芯材フィルムを作製した。
[Production Example 4]
An ethylene-methacrylic acid copolymer (“Nucleel NC903HC” manufactured by Mitsui DuPont Chemical Co., Ltd., 91 mass% olefin monomer unit) is formed to a thickness of 100 μm and subjected to corona treatment on both sides to produce the core of Production Example 4 A material film was prepared.
＜防水用両面粘着テープの作製＞
［実施例１］
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）、エチルアクリレート（ＥＡ）、アクリル酸（ＡＡＣ）、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酸エステル共重合体（２ＥＨＡ／ＢＡ／ＥＡ／ＡＡＣ／ＨＥＡの質量比＝６５／２５／６／３／１、重量平均分子量６０万）の固形分１００質量部に対して、粘着付与樹脂（荒川化学工業社製、製品名「パインクリスタルＫＥ−３１１」）２５質量部を配合し、酢酸エチルで希釈することにより、固形分５０質量％の溶液を得た。続いて、上記の溶液１００質量部に対して、イソシアネート系架橋剤（東ソー社製、製品名「コロネートＬ」、固形分７５質量％）０．５質量部を混合し、粘着剤組成物（Ａ）を調製した。
<Preparation of waterproof double-sided adhesive tape>
[Example 1]
Acrylate ester copolymer (2EHA / BA /) containing 2-ethylhexyl acrylate (2EHA), butyl acrylate (BA), ethyl acrylate (EA), acrylic acid (AAC), and 2-hydroxyethyl acrylate (HEA) as monomer components To 100 mass parts of solid content of EA / AAC / HEA mass ratio = 65/25/6/3/1, weight average molecular weight 600,000), tackifying resin (Arakawa Chemical Industries, product name “Pine Crystal”) KE-311 ") 25 parts by mass, and diluted with ethyl acetate, a solution with a solid content of 50% by mass was obtained. Subsequently, 0.5 parts by mass of an isocyanate-based crosslinking agent (product name “Coronate L”, solid content: 75% by mass, manufactured by Tosoh Corporation) is mixed with 100 parts by mass of the above solution, and an adhesive composition (A ) Was prepared.
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上記の粘着剤組成物（Ａ）を塗布し、１００℃で約２分間加熱乾燥して架橋し厚さ５０μｍの粘着剤層を得た。その後、粘着剤層に製造例１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。 The pressure-sensitive adhesive composition (A) is applied to the release-treated surface of a light release sheet (trade name “SP-PET381031” manufactured by Lintec Corporation) using a knife coater, and dried at 100 ° C. for about 2 minutes. Thus, a pressure-sensitive adhesive layer having a thickness of 50 μm was obtained. Thereafter, the core material film of Production Example 1 was laminated on the pressure-sensitive adhesive layer to obtain a single-sided pressure-sensitive adhesive film.
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上記の粘着剤組成物（Ａ）を塗布し、１００℃で約２分間加熱乾燥して架橋し厚さ５０μｍの粘着剤層を得た。その後、粘着剤層を上記の片面粘着フィルムの芯材フィルム面に貼合して、実施例１の防水用両面粘着テープを作製した。 Next, the pressure-sensitive adhesive composition (A) is applied to the release-treated surface of the heavy release sheet (trade name “SP-PET3811” manufactured by Lintec Corporation) using a knife coater, and heated at 100 ° C. for about 2 minutes. It dried and bridge | crosslinked and obtained the 50-micrometer-thick adhesive layer. Then, the adhesive layer was bonded to the core material film surface of the above single-sided adhesive film to produce the waterproof double-sided adhesive tape of Example 1.
［実施例２］
芯材フィルムとして、製造例２の芯材フィルムを使用した以外は実施例１と同様にして実施例２の防水用両面粘着テープを作製した。
[Example 2]
A waterproof double-sided pressure-sensitive adhesive tape of Example 2 was produced in the same manner as in Example 1 except that the core material film of Production Example 2 was used as the core material film.
［実施例３］
アクリル系共重合体（２ＥＨＡ／ＢＡ／ＥＡ／ＡＡＣ／ＨＥＡの質量比＝５５／３５／６／３／１、重量平均分子量６０万）の固形分１００質量部に対して、粘着付与樹脂（荒川化学工業社製、製品名「パインクリスタルＫＥ−３１１」）３０質量部を配合し、酢酸エチルにて固形分５０質量％の溶液を調製した。続いて、上記の溶液１００質量部に対してイソシアネート系架橋剤（東ソー社製、「製品名「コロネートＬ」、固形分７５質量％」０．５質量部を混合し、粘着剤組成物（Ｂ）を調製した。
[Example 3]
A tackifying resin (Arakawa) is used for 100 parts by mass of an acrylic copolymer (2EHA / BA / EA / AAC / HEA mass ratio = 55/35/6/3/1, weight average molecular weight 600,000). Chemical Industry Co., Ltd., product name “Pine Crystal KE-311”) 30 parts by mass was blended, and a solution having a solid content of 50% by mass was prepared with ethyl acetate. Subsequently, 0.5 parts by mass of an isocyanate-based cross-linking agent (manufactured by Tosoh Corporation, “product name“ Coronate L ”, solid content 75% by mass”) is mixed with 100 parts by mass of the above solution, and an adhesive composition (B ) Was prepared.
粘着剤組成物として上記の粘着剤組成物（Ｂ）を使用した以外は実施例１と同様にして実施例３の防水用両面粘着テープを作製した。 A waterproof double-sided pressure-sensitive adhesive tape of Example 3 was produced in the same manner as in Example 1 except that the above-mentioned pressure-sensitive adhesive composition (B) was used as the pressure-sensitive adhesive composition.
［実施例４］
粘着剤組成物として上記の粘着剤組成物（Ｂ）を使用した以外は実施例２と同様にして実施例４の防水用両面粘着テープを作製した。
[Example 4]
A waterproof double-sided pressure-sensitive adhesive tape of Example 4 was produced in the same manner as in Example 2 except that the above-mentioned pressure-sensitive adhesive composition (B) was used as the pressure-sensitive adhesive composition.
［実施例５］
２ＥＨＡ、ＢＡ、酢酸ビニル（ＶＡＣ）、ＡＡＣ、ＨＥＡをモノマー成分とするアクリル酸エステル共重合体（２ＥＨＡ／ＢＡ／ＶＡＣ／ＡＡＣ／ＨＥＡの質量比＝４６／４６／６．５／１／０．５）、重量平均分子量８０万）の固形分１００質量部に対して、粘着付与樹脂（荒川化学工業社製、製品名「パインクリスタルＫＥ−３５９」）２０質量部を配合し、酢酸エチルにて固形分５０質量％の溶液を調製した。続いて、上記の溶液１００質量部に対してイソシアネート系架橋剤（東ソー社製、「製品名「コロネートＬ」、固形分７５質量％」１質量部を混合し、粘着剤組成物（Ｃ）を調製した。
[Example 5]
2EHA, BA, vinyl acetate (VAC), AAC, and an acrylic ester copolymer having monomer components of HEA (mass ratio of 2EHA / BA / VAC / AAC / HEA = 46/46 / 6.5 / 1/0. 5) 20 parts by mass of tackifier resin (Arakawa Chemical Industries, product name “Pine Crystal KE-359”) is blended with 100 parts by mass of the solid content of the weight average molecular weight of 800,000), and ethyl acetate A solution having a solid content of 50% by mass was prepared. Subsequently, 1 part by mass of an isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, “product name“ Coronate L ”, solid content: 75% by mass) is mixed with 100 parts by mass of the above solution, and the pressure-sensitive adhesive composition (C) is obtained. Prepared.
粘着剤組成物として上記の粘着剤組成物（Ｃ）を使用した以外は実施例１と同様にして実施例５の防水用両面粘着テープを作製した。 A waterproof double-sided pressure-sensitive adhesive tape of Example 5 was produced in the same manner as in Example 1 except that the above-mentioned pressure-sensitive adhesive composition (C) was used as the pressure-sensitive adhesive composition.
［実施例６］
粘着剤組成物として上記の粘着剤組成物（Ｃ）を使用した以外は実施例２と同様にして実施例６の防水用両面粘着テープを作製した。
[Example 6]
A waterproof double-sided pressure-sensitive adhesive tape of Example 6 was produced in the same manner as in Example 2 except that the above-mentioned pressure-sensitive adhesive composition (C) was used as the pressure-sensitive adhesive composition.
［比較例１］
アクリル系共重合体（２ＥＨＡ／ＢＡ／ＡＡＣの質量比＝１９／８０／１、重量平均分子量８０万）の固形分１００質量部に対して、粘着付与樹脂（荒川化学工業社製、製品名「パインクリスタルＫＥ−３５９」）３０質量部を配合し、酢酸エチルにて固形分５５質量％の溶液を調製した。続いて、上記の溶液１００質量部に対してイソシアネート系架橋剤（東ソー社製、「製品名「コロネートＬ」、固形分７５質量％」１．８質量部を混合し、粘着剤組成物（Ｄ）を調製した。
[Comparative Example 1]
To 100 parts by mass of the solid content of the acrylic copolymer (2EHA / BA / AAC mass ratio = 19/80/1, weight average molecular weight 800,000), a tackifier resin (Arakawa Chemical Industries, product name “ Pine Crystal KE-359 ") 30 parts by mass was prepared, and a solution having a solid content of 55% by mass was prepared with ethyl acetate. Subsequently, an isocyanate-based cross-linking agent (manufactured by Tosoh Corporation, “product name“ Coronate L ”, solid content: 75% by mass”, 1.8 parts by mass) was mixed with 100 parts by mass of the above solution, and an adhesive composition (D ) Was prepared.
粘着剤組成物として上記の粘着剤組成物（Ｄ）を使用した以外は実施例１と同様にして比較例１の防水用両面粘着テープを作製した。 A waterproof double-sided pressure-sensitive adhesive tape of Comparative Example 1 was produced in the same manner as in Example 1 except that the above-mentioned pressure-sensitive adhesive composition (D) was used as the pressure-sensitive adhesive composition.
［比較例２］
粘着剤組成物として上記の粘着剤組成物（Ｄ）を使用した以外は実施例２と同様にして比較例２の防水用両面粘着テープを作製した。
[Comparative Example 2]
A waterproof double-sided pressure-sensitive adhesive tape of Comparative Example 2 was produced in the same manner as in Example 2 except that the above-mentioned pressure-sensitive adhesive composition (D) was used as the pressure-sensitive adhesive composition.
［比較例３］
アクリル系共重合体（ＢＡ／ＶＡＣ／ＡＡＣ／ＨＥＡの質量比＝９４／３／３／０．５、重量平均分子量１００万）の固形分１００質量部に対して、粘着付与樹脂（荒川化学工業社製、製品名「パインクリスタルＫＥ−３１１」）５０質量部及び（荒川化学工業社製、製品名「ペンセルＤ−１３５」）５質量部を配合し、酢酸エチルにて固形分４０質量％の溶液を調製した。続いて、上記の溶液１００質量部に対してイソシアネート系架橋剤（東ソー社製、「製品名「コロネートＬ」、固形分７５質量％」０．５質量部を混合し、粘着剤組成物（Ｅ）を調製した。
[Comparative Example 3]
A tackifying resin (Arakawa Chemical Industries) with respect to 100 parts by mass of an acrylic copolymer (BA / VAC / AAC / HEA mass ratio = 94/3/3 / 0.5, weight average molecular weight 1 million) 50 parts by mass (product name “Pine Crystal KE-311”) and 5 parts by mass (product name “Pencel D-135”, manufactured by Arakawa Chemical Industries, Ltd.) are blended, and the solid content is 40% by mass with ethyl acetate. A solution was prepared. Subsequently, 100 parts by mass of the above solution was mixed with 0.5 parts by mass of an isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, “product name“ Coronate L ”, solid content 75% by mass”). ) Was prepared.
粘着剤組成物として上記の粘着剤組成物（Ｅ）を使用した以外は実施例１と同様にして比較例３の防水用両面粘着テープを作製した。 A waterproof double-sided pressure-sensitive adhesive tape of Comparative Example 3 was produced in the same manner as in Example 1 except that the above-mentioned pressure-sensitive adhesive composition (E) was used as the pressure-sensitive adhesive composition.
［比較例４］
粘着剤組成物として上記の粘着剤組成物（Ｅ）を使用した以外は実施例２と同様にして比較例４の防水用両面粘着テープを作製した。
[Comparative Example 4]
A waterproof double-sided pressure-sensitive adhesive tape of Comparative Example 4 was produced in the same manner as in Example 2 except that the above-mentioned pressure-sensitive adhesive composition (E) was used as the pressure-sensitive adhesive composition.
［比較例５］
アクリル系共重合体（２ＥＨＡ／ＢＡ／ＡＡＣの質量比＝１９／８０／１、重量平均分子量８０万）の固形分１００質量部に対して、粘着付与樹脂（荒川化学工業社製、製品名「パインクリスタルＫＥ−３５９」）１０質量部を配合し、酢酸エチルにて固形分５５質量％の溶液を調製した。続いて、上記の溶液１００質量部に対してイソシアネート系架橋剤（東ソー社製、「製品名「コロネートＬ」、固形分７５質量％」１．０質量部を混合し、粘着剤組成物（Ｆ）を調製した。
[Comparative Example 5]
To 100 parts by mass of the solid content of the acrylic copolymer (2EHA / BA / AAC mass ratio = 19/80/1, weight average molecular weight 800,000), a tackifier resin (Arakawa Chemical Industries, product name “ Pine crystal KE-359 ") 10 parts by mass, and a solution having a solid content of 55% by mass was prepared with ethyl acetate. Subsequently, 100 parts by mass of the above solution was mixed with 1.0 part by mass of an isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, “product name“ Coronate L ”, solid content 75% by mass”), and pressure-sensitive adhesive composition (F ) Was prepared.
粘着剤組成物として上記の粘着剤組成物（Ｆ）を使用した以外は実施例１と同様にして比較例５の防水用両面粘着テープを作製した。 A waterproof double-sided pressure-sensitive adhesive tape of Comparative Example 5 was produced in the same manner as in Example 1 except that the above-mentioned pressure-sensitive adhesive composition (F) was used as the pressure-sensitive adhesive composition.
［比較例６］
粘着剤組成物として上記の粘着剤組成物（Ｆ）を使用した以外は実施例２と同様にして比較例６の防水用両面粘着テープを作製した。
[Comparative Example 6]
A waterproof double-sided pressure-sensitive adhesive tape of Comparative Example 6 was produced in the same manner as in Example 2 except that the above-mentioned pressure-sensitive adhesive composition (F) was used as the pressure-sensitive adhesive composition.
［比較例７］
粘着剤組成物として上記の粘着剤組成物（Ｃ）、心材フィルムとして、製造例３の心材フィルムを使用したこと以外は、実施例１と同様にして比較例７の防水用両面粘着テープを作製した。
[Comparative Example 7]
A waterproof double-sided pressure-sensitive adhesive tape of Comparative Example 7 was produced in the same manner as in Example 1 except that the above-mentioned pressure-sensitive adhesive composition (C) was used as the pressure-sensitive adhesive composition, and the core material film of Production Example 3 was used as the core material film. did.
［比較例８］
粘着剤組成物として上記の粘着剤組成物（Ｃ）、芯材フィルムとして、製造例４の芯材フィルムを使用したこと以外は、実施例１と同様にして比較例８の防水用両面粘着テープを作製した。
[Comparative Example 8]
The waterproof double-sided pressure-sensitive adhesive tape of Comparative Example 8 in the same manner as in Example 1 except that the above-mentioned pressure-sensitive adhesive composition (C) was used as the pressure-sensitive adhesive composition and the core material film of Production Example 4 was used as the core material film. Was made.
＜両面粘着テープの評価＞
実施例１〜６及び比較例１〜８の両面粘着テープについて、上述した方法により、芯材の曲げこわさ、０℃における粘着剤層の貯蔵弾性率、耐衝撃性、浮き量、防水性、水蒸気透過率を評価した。評価結果を表１に示す。
<Evaluation of double-sided adhesive tape>
About the double-sided pressure-sensitive adhesive tapes of Examples 1 to 6 and Comparative Examples 1 to 8, by the above-described method, the bending stiffness of the core material, the storage elastic modulus of the pressure-sensitive adhesive layer at 0 ° C., the impact resistance, the floating amount, the waterproof property, the water vapor The transmittance was evaluated. The evaluation results are shown in Table 1.
本発明によれば、１ｍｍ程度の非常に狭いテープ幅で使用した場合であっても防水性が高く、耐衝撃性にも優れる、防水用両面粘着テープを提供することができる。 According to the present invention, it is possible to provide a waterproof double-sided pressure-sensitive adhesive tape that is highly waterproof and excellent in impact resistance even when used with a very narrow tape width of about 1 mm.
１００，２００…測定用サンプル、１１０…ガラス板、１２０，２２０…額縁状に打ち抜いた両面粘着テープ、１３０…ポリプロピレン製の板、２１０ａ，２１０ｂ…透明アクリル板、２３０…十字状の黒色印刷。 100, 200 ... measurement sample, 110 ... glass plate, 120, 220 ... double-sided adhesive tape punched into a frame shape, 130 ... polypropylene plate, 210a, 210b ... transparent acrylic plate, 230 ... cross-shaped black print.
Claims (10)
ＪＩＳ Ｋ７１０６：１９９５に準拠して測定した前記芯材の曲げこわさが３０〜１０７ＭＰａであり、
ＪＩＳ Ｋ７２４４−６：１９９９に準拠して測定した０℃における前記粘着剤層の貯蔵弾性率が０．３ＭＰａ以下である、防水用両面粘着テープ。 A core material not having a foam structure, and an adhesive layer laminated on both surfaces of the core material,
The bending stiffness of the core material measured in accordance with JIS K7106: 1995 is 30 to 107 MPa,
Double-sided pressure-sensitive adhesive tape for waterproofing, wherein the storage elastic modulus of the pressure-sensitive adhesive layer at 0 ° C. measured in accordance with JIS K7244-6: 1999 is 0.3 MPa or less.
（測定方法）
縦１５０ｍｍ×横７０ｍｍ×厚さ２ｍｍのポリカーボネート板、及び縦１５０ｍｍ×横７０ｍｍ×厚さ２ｍｍのポリカーボネート板を、幅２ｍｍの額縁状に打ち抜いた縦６０ｍｍ×横４０ｍｍ×厚さ２００μｍの前記防水用両面粘着テープで貼り合わせた後、高さ１５０ｃｍからステンレス床上に繰り返し落下させ、前記防水用両面粘着テープと前記ポリカーボネート板の少なくとも１部が剥離するのに要した落下の回数から１を減じた回数を耐衝撃性とする。 The double-sided adhesive tape for waterproofing according to any one of claims 1 to 4, wherein the impact resistance at 23 ° C measured by the following measurement method is 10 times or more.
(Measuring method)
150 mm long × 70 mm wide × 2 mm thick polycarbonate plate and 150 mm long × 70 mm wide × 2 mm thick polycarbonate plate punched into a frame shape with a width of 2 mm 60 mm long × 40 mm wide × 200 μm thick for both sides for waterproofing After pasting together with adhesive tape, it is repeatedly dropped onto a stainless steel floor from a height of 150 cm, and 1 is subtracted from the number of drops required to peel off at least one part of the waterproof double-sided adhesive tape and the polycarbonate plate. Impact resistant.
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