JP6832161B2 - 導電性粘着テープ - Google Patents
導電性粘着テープ Download PDFInfo
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- JP6832161B2 JP6832161B2 JP2016575241A JP2016575241A JP6832161B2 JP 6832161 B2 JP6832161 B2 JP 6832161B2 JP 2016575241 A JP2016575241 A JP 2016575241A JP 2016575241 A JP2016575241 A JP 2016575241A JP 6832161 B2 JP6832161 B2 JP 6832161B2
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- conductive
- pressure
- sensitive adhesive
- meth
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- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
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- 238000010298 pulverizing process Methods 0.000 description 1
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- 150000003839 salts Chemical class 0.000 description 1
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- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
- JRSJRHKJPOJTMS-UHFFFAOYSA-N trimethoxy(2-phenylethenyl)silane Chemical compound CO[Si](OC)(OC)C=CC1=CC=CC=C1 JRSJRHKJPOJTMS-UHFFFAOYSA-N 0.000 description 1
- GRPURDFRFHUDSP-UHFFFAOYSA-N tris(prop-2-enyl) benzene-1,2,4-tricarboxylate Chemical compound C=CCOC(=O)C1=CC=C(C(=O)OCC=C)C(C(=O)OCC=C)=C1 GRPURDFRFHUDSP-UHFFFAOYSA-N 0.000 description 1
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- 229910052721 tungsten Inorganic materials 0.000 description 1
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- 229930195735 unsaturated hydrocarbon Natural products 0.000 description 1
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- 229920001567 vinyl ester resin Polymers 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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Images
Classifications
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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
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
- C09J9/02—Electrically-conducting adhesives
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- 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
- C09J201/00—Adhesives based on unspecified macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Adhesive Tapes (AREA)
Description
上記基材は、上記粘着剤層を支持するための支持体である。上記基材としては、金属箔及び導電性樹脂材等が挙げられる。導電性粘着テープの電気特性をより一層高める観点からは、上記基材は金属箔であることが好ましい。
上記粘着剤層において、上記粘着剤100重量部に対して、上記導電性粒子の含有量は20重量部以下である。本発明では、導電性粒子の含有量が同じである場合に、導電性粒子として、金属粒子を除く基材粒子と上記基材粒子の表面上に配置された導電部を有する導電性粒子を用いることで、金属粒子である導電性粒子を用いた場合と比べて、本発明の効果をより一層高めることができる。電気特性、粘着性、及び、高温又は高湿下での浮き及び剥離の発生防止性をより一層バランスよく高める観点からは、上記粘着剤層において、上記粘着剤100重量部に対して、上記導電性粒子の含有量は好ましくは0.1重量部以上、より好ましくは0.75重量部以上、更に好ましくは1重量部以上であり、好ましくは15重量部以下、より好ましくは10重量部以下、更に好ましくは5重量部以下である。
ρ:導電性粒子の粒子径の標準偏差
Dn:導電性粒子の粒子径の平均値
上記粘着剤としては、(メタ)アクリル系粘着剤、ゴム系粘着剤、ウレタン系粘着剤、エポキシ系粘着剤及びシリコーン系粘着剤等が挙げられる。高温下での粘着力の過度な上昇を抑制する観点からは、上記粘着剤は、(メタ)アクリル系粘着剤であることが好ましい。
上記導電性粒子は、金属粒子を除く基材粒子と、上記基材粒子の表面上に配置された導電部とを有する。
F:基材粒子が10%圧縮変形したときの荷重値(N)
S:基材粒子が10%圧縮変形したときの圧縮変位(mm)
R:基材粒子の半径(mm)
電解銅箔(1)(平均厚み12μm)
粘着剤溶液(1):温度計、攪拌機及び冷却管を備えた反応器に、ブチルアクリレート60重量部、2−エチルヘキシルアクリレート36.9重量部、アクリル酸3重量部、2−ヒドロキシエチルアクリレート0.1重量部、及び、酢酸エチル80重量部を加え、窒素置換した後、反応器を加熱して還流を開始した。続いて、上記反応器内に、重合開始剤としてアゾビスイソブチロニトリル0.1重量部を添加した。70℃で5時間還流させて、アクリル共重合体(a)の溶液を得た。得られたアクリル共重合体(a)について、カラムとしてWater社製「2690 Separations Model」を用いてGPC法により測定された重量平均分子量は、140万であった。
基材粒子の10%K値を、上述した方法により算出した。
下記の表1に示す粘着剤溶液に、表1に示す導電性粒子を配合し、配合物を得た。なお、導電性粒子の配合量は、得られる粘着剤層において、粘着剤100重量部に対して、導電性粒子の含有量が表1に示す量となる配合量である。
(1)粘着力
JIS Z0237に準拠して、得られた導電性粘着テープの180度剥離粘着力を測定した。具体的には、得られた導電性粘着テープを、25mm×100mmに裁断し、セパレーターを剥離して導電性粘着テープ片を得た。導電性粘着テープ片を、被着体であるJIS G4305の280番研磨SUSに、23℃及び湿度65%RH試験室において2kgゴムローラーを1往復させ圧着し、貼り付けた。同様の環境下にて20分放置した後、引張速度300mm/minにて、導電性粘着テープ片をSUSから180度方向に引き剥がし、その引き剥がしに要する力を測定することで、粘着力を評価した。粘着力を下記の基準で判定した。
○:粘着力が11N/25mm以上
△:粘着力が10N/25mm以上、11N/25mm未満
×:粘着力が10N/25mm未満
得られた導電性粘着テープを、10mm×10mmのサイズに裁断し、セパレーターを剥離して導電性粘着テープ片を得た。幅1mmのアルミニウム板電極に3kg/cm2の加圧を5秒間かけて導電性粘着テープ片を貼り付けた。各電極への貼り付け面積を1mm×10mmとした。その後、23℃及び湿度65%RH試験室において、圧開放後の抵抗値を5秒毎60回読み取り平均化することで、抵抗値を評価した。抵抗値を下記の基準で判定した。なお、抵抗値が低いほど、電気特性に優れている。抵抗値の「O.L.」は測定限界(1GΩ)を超え、抵抗値が測定できない状態を意味する。
○:抵抗値が1Ω以下
△:抵抗値が1Ωを超え、3.1Ω以下
×:抵抗値が3.1Ωを超える、又は、結果が「O.L.」
得られた導電性粘着テープを、10mm×2mmのサイズに裁断し、セパレーターを剥離して導電性粘着テープ片を得た。幅1mmのアルミニウム板電極に3kg/cm2の加圧を5秒間かけて導電性粘着テープ片を貼り付けた。各電極への貼り付け面積を1mm×2mmとした。その後、23℃及び湿度65%RH試験室において、圧開放後の抵抗値を5秒毎60回読み取り平均化することで、抵抗値を評価した。抵抗値を下記の基準で判定した。なお、抵抗値が低いほど、電気特性に優れている。抵抗値の「O.L.」は測定限界(1GΩ)を超え、抵抗値が測定できない状態を意味する。
○:抵抗値が10Ω以下
△:抵抗値が10Ωを超え、25Ω以下
×:抵抗値が25Ωを超える、又は、結果が「O.L.」
得られた導電性粘着テープを、20mm×20mmのサイズに裁断し、セパレーターを剥離して導電性粘着テープ片を得た。導電性粘着テープ片の粘着剤層側から、平面視において貼り付け起点から貼り付け終点まで右に5mm、直角に曲げ下に2mm、直角に曲げ左に13mm、ガラス板(厚さ2mm)に貼り付けて、積層体を得た。5mm×20mmの貼り付け面を1.5mm×20mm(1)及び0.7mm×20mm(2)となるよう裁断し、裁断した不必要な部分は剥ぎ取り、評価サンプルを得た。(1)、(2)の1.5mm×20mm及び0.7mm×20mmの貼り付け面を、2kgゴムローラーを1往復させ圧着した。同様の環境下にて20分放置した後、得られた積層体を60℃及び湿度90%RHの条件で72時間放置した。放置後に、導電性粘着テープ(1),(2)の浮き及び剥離を観察し、耐反発性を下記の基準で判定した。
○:導電性粘着テープ(1)及び(2)の双方で、浮き及び剥離の双方が発生しない
△:導電性粘着テープ(2)で、浮き及び剥離の双方が発生しない。導電性粘着テープ(1)で、浮き又は剥離が発生
×:導電性粘着テープ(1)及び(2)の双方で、浮き又は剥離が発生
得られた配合物(粘着剤溶液に導電性粒子を配合した配合物)を、光学顕微鏡を用いて観察し、導電性粒子の凝集の有無を確認した。
11…基材
12…粘着剤層
21…粘着剤
22…導電性粒子
31…基材粒子
32…導電部
Claims (5)
- 導電性を有する基材と、
前記基材の表面上に配置された粘着剤層とを備え、
前記粘着剤層は、粘着剤と、導電性粒子とを含み、
前記導電性粒子は、金属粒子を除く基材粒子と、前記基材粒子の表面上に配置された導電部とを有し、
前記基材粒子の10%K値が4000N/mm 2 以下であり、
前記粘着剤層において、前記粘着剤100重量部に対して、前記導電性粒子の含有量が20重量部以下である、導電性粘着テープ。 - 前記粘着剤層の平均厚みが20μm以下である、請求項1に記載の導電性粘着テープ。
- 前記基材粒子が樹脂粒子である、請求項1又は2に記載の導電性粘着テープ。
- 前記基材が金属箔である、請求項1〜3のいずれか1項に記載の導電性粘着テープ。
- 前記導電性粒子の粒子径のCV値が3%以下である、請求項1〜4のいずれか1項に記載の導電性粘着テープ。
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