JP2014067762A - 異方性導電接着剤 - Google Patents
異方性導電接着剤 Download PDFInfo
- Publication number
- JP2014067762A JP2014067762A JP2012210223A JP2012210223A JP2014067762A JP 2014067762 A JP2014067762 A JP 2014067762A JP 2012210223 A JP2012210223 A JP 2012210223A JP 2012210223 A JP2012210223 A JP 2012210223A JP 2014067762 A JP2014067762 A JP 2014067762A
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- Prior art keywords
- particles
- anisotropic conductive
- conductive adhesive
- heat
- conductive particles
- Prior art date
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- Granted
Links
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Images
Classifications
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- C—CHEMISTRY; METALLURGY
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- C09J9/02—Electrically-conducting adhesives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
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- C—CHEMISTRY; METALLURGY
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K3/10—Metal 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
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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
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
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- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
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Abstract
【解決手段】導電性粒子31と、導電性粒子1よりも平均粒径が小さい熱伝導粒子32とをバインダーに分散させる。この異方性導電接着剤を用いて熱圧着したLED実装体は、LED素子の端子(電極12a、14a)と、基板の端子(電極22a、23a)とが導電性粒子31を介して電気的に接続され、LED素子の端子と基板の端子との間に熱伝導粒子32が捕捉される。
【選択図】図3
Description
1.異方性導電接着剤及びその製造方法
2.接続構造体及びその製造方法
3.実施例
本実施の形態における異方性導電接着剤は、樹脂粒子の表面に導電性金属層が形成された導電性粒子と、導電性粒子よりも平均粒径が小さい熱伝導粒子とがバインダー(接着剤成分)中に分散されたものであり、その形状は、ペースト、フィルムなどであり、目的に応じて適宜選択することができる。
次に、前述した異方性導電接着剤を用いた接続構造体について説明する。本実施の形態における接続構造体は、第1の電子部品の端子と、第2の電子部品の端子とが、樹脂粒子の表面に導電性金属層が形成された導電性粒子を介して電気的に接続されてなる接続構造体において、第1の電子部品の端子と前記第2の電子部品の端子との間に、導電性粒子よりも平均粒径が小さい熱伝導粒子が捕捉されている。
以下、本発明の実施例について詳細に説明するが、本発明はこれらの実施例に限定されるものではない。
本実験では、熱伝導粒子を配合した異方性導電接着剤(ACP)を作製し、LED実装体を作製し、熱伝導粒子の種類について検討した。
エポキシ硬化系接着剤(エポキシ樹脂(商品名:CEL2021P、(株)ダイセル化学製)及び酸無水物(MeHHPA、商品名:MH700、新日本理化(株)製)を主成分としたバインダー)中に、樹脂粒子の表面にAuが被覆された平均粒径5μmの導電性粒子(品名:AUL705、積水化学工業社製)を10質量%配合した。この樹脂組成物に熱伝導粒子を配合し、熱伝導性を有する異方性導電接着剤を作製した。
異方性導電接着剤をガラス板で挟み込み、これを150℃、1時間の条件で硬化し、厚み1mmtの硬化物を得た。そして、レーザーフラッシュ法による測定装置(キセノンフラッシュアナライザーLFA447、NETZSCH製)を用いて、硬化物の熱伝導率の測定を行った。
異方性導電接着剤を用いてLEDチップ(青色LED、Vf=3.2V(If=20mA))をAu電極基板に搭載した。異方性導電接着剤をAu電極基板に塗布した後、LEDチップをアライメントして搭載し、200℃−20秒−1kg/chipの条件で加熱圧着を行った。Au電極基板は、バンプボンダーにてAuバンプを形成した後、フラットニング処理を行ったものを使用した(ガラスエポキシ基板、導体スペース=100μmP、Ni/Auメッキ=5.0/0.3μm、金バンプ=15μmt)。
過渡熱抵抗測定装置(CATS電子設計社製)を用いて、LED実装体の熱抵抗値(℃/W)を測定した。測定条件はIf=200mA(定電流制御)で行った。
積分球による全光束測定装置(LE−2100、大塚電子株式会社製)を用いて、LED実装体の全光束量(mlm)を測定した。測定条件はIf=200mA(定電流制御)で行った。
初期Vf値として、If=20mA時のVf値を測定した。また、85℃、85%RH環境下でLED実装体をIf=20mAで500時間点灯させ(高温高湿試験)、If=20mA時のVf値を測定した。接続信頼性の評価は、初期Vf値よりも5%以上上昇した場合を「導通NG」と評価し、初期Vf値よりも5%以上低下した場合を「絶縁NG」と評価し、それ以外を「○」と評価した。
熱伝導粒子として、平均粒径(D50)1μmのAg粒子(熱伝導率:428W/(m・K))を用いた。前述の樹脂組成物にこの熱伝導粒子を5体積%配合し、熱伝導性を有する異方性導電接着剤を作製した。この異方性導電接着剤の硬化物の熱伝導率の測定結果は、0.3W/(m・K)であった。また、この異方性導電接着剤を用いて作製したLED実装体の熱抵抗の測定結果は160℃/W、全光束量の測定結果は320mlm、接続信頼性の評価結果は、初期で○、高温高湿試験後で○であった。
熱伝導粒子として、平均粒径(D50)1μmのAg粒子(熱伝導率:428W/(m・K))を用いた。前述の樹脂組成物にこの熱伝導粒子を20体積%配合し、熱伝導性を有する異方性導電接着剤を作製した。この異方性導電接着剤の硬化物の熱伝導率の測定結果は、0.4W/(m・K)であった。また、この異方性導電接着剤を用いて作製したLED実装体の熱抵抗の測定結果は130℃/W、全光束量の測定結果は300mlm、接続信頼性の評価結果は、初期で○、高温高湿試験後で○であった。
熱伝導粒子として、平均粒径(D50)1μmのAg粒子(熱伝導率:428W/(m・K))を用いた。前述の樹脂組成物にこの熱伝導粒子を40体積%配合し、熱伝導性を有する異方性導電接着剤を作製した。この異方性導電接着剤の硬化物の熱伝導率の測定結果は、0.5W/(m・K)であった。また、この異方性導電接着剤を用いて作製したLED実装体の熱抵抗の測定結果は120℃/W、全光束量の測定結果は280mlm、接続信頼性の評価結果は、初期で○、高温高湿試験後で○であった。
熱伝導粒子として、Ag粒子表面を100nm厚みのSiO2で被覆した平均粒径(D50)1μmの絶縁被覆粒子を用いた。前述の樹脂組成物にこの熱伝導粒子を50体積%配合し、熱伝導性を有する異方性導電接着剤を作製した。この異方性導電接着剤の硬化物の熱伝導率の測定結果は、0.5W/(m・K)であった。また、この異方性導電接着剤を用いて作製したLED実装体の熱抵抗の測定結果は115℃/W、全光束量の測定結果は280mlm、接続信頼性の評価結果は、初期で○、高温高湿試験後で○であった。
熱伝導粒子として、平均粒径(D50)1.5μmのAg/Pd合金粒子(熱伝導率:400W/(m・K))を用いた。前述の樹脂組成物にこの熱伝導粒子を5体積%配合し、熱伝導性を有する異方性導電接着剤を作製した。この異方性導電接着剤の硬化物の熱伝導率の測定結果は、0.4W/(m・K)であった。また、この異方性導電接着剤を用いて作製したLED実装体の熱抵抗の測定結果は135℃/W、全光束量の測定結果は300mlm、接続信頼性の評価結果は、初期で○、高温高湿試験後で○であった。
熱伝導粒子を配合せずに異方性導電接着剤を作製した。この異方性導電接着剤の硬化物の熱伝導率の測定結果は、0.2W/(m・K)であった。また、この異方性導電接着剤を用いて作製したLED実装体の熱抵抗の測定結果は200℃/W、全光束量の測定結果は330mlm、接続信頼性の評価結果は、初期で○、高温高湿試験後で○であった。
熱伝導粒子として、平均粒径(D50)1μmのAg粒子(熱伝導率:428W/(m・K))を用いた。前述の樹脂組成物にこの熱伝導粒子を50体積%配合し、熱伝導性を有する異方性導電接着剤を作製した。この異方性導電接着剤の硬化物の熱伝導率の測定結果は、0.55W/(m・K)であった。また、この異方性導電接着剤を用いて作製したLED実装体の熱抵抗の測定結果は110℃/W、全光束量の測定結果は250mlm、接続信頼性の評価結果は、初期で○、高温高湿試験後で絶縁NGであった。
熱伝導粒子として、平均粒径(D50)1.2μmのAlN粒子(熱伝導率:190W/(m・K))を用いた。前述の樹脂組成物にこの熱伝導粒子を55体積%配合し、熱伝導性を有する異方性導電接着剤を作製した。この異方性導電接着剤の硬化物の熱伝導率の測定結果は、1.0W/(m・K)であった。また、この異方性導電接着剤を用いて作製したLED実装体の熱抵抗の測定結果は170℃/W、全光束量の測定結果は250mlm、接続信頼性の評価結果は、初期で○、高温高湿試験後で導通NGであった。
本実験では、熱伝導粒子として、金属粒子表面に絶縁層を形成した絶縁被覆粒子を配合した異方性導電接着剤(ACP)を作製し、LED実装体を作製し、絶縁被覆粒子の絶縁層の厚みついて検討した。
スチレンを主成分とする樹脂粉末(接着剤層、粒径0.2μm)と、Ag金属粉(粒径1μm)とを混合した後、粉末同士を物理的な力で衝突させ成膜する成膜装置(ホソカワミクロン製メカノフージョン)にてAg金属粉末表面に100nm程度の白色絶縁層を形成した金属を得た。
くし葉上にパターニングされた配線基板上に厚み100nmのACP硬化物を塗布計せした。くし葉の両極に電圧を500Vまで印加し、0.5mA電流が流れたときの電圧を耐電圧とした。配線間スペースが25μmのときの耐電圧、及び配線間スペースが100μmのときの耐電圧を測定した。
熱伝導粒子として、Ag粒子表面を20nm厚みのスチレン樹脂で被覆した平均粒径(D50)1μmの絶縁被覆粒子を用いた。前述の樹脂組成物にこの熱伝導粒子を50体積%配合し、熱伝導性を有する異方性導電接着剤を作製した。この異方性導電接着剤の硬化物の熱伝導率の測定結果は0.5W/(m・K)であり、配線間スペースが25μmときの耐電圧の試験結果は150Vであり、配線間スペースが100μmときの耐電圧の試験結果は500V超であった。また、この異方性導電接着剤を用いて作製したLED実装体の熱抵抗の測定結果は130℃/W、全光束量の測定結果は300mlmであった。
熱伝導粒子として、Ag粒子表面を100nm厚みのスチレン樹脂で被覆した平均粒径(D50)1μmの絶縁被覆粒子を用いた。前述の樹脂組成物にこの熱伝導粒子を50体積%配合し、熱伝導性を有する異方性導電接着剤を作製した。この異方性導電接着剤の硬化物の熱伝導率の測定結果は0.4W/(m・K)であり、配線間スペースが25μmときの耐電圧の試験結果は210Vであり、配線間スペースが100μmときの耐電圧の試験結果は500V超であった。また、この異方性導電接着剤を用いて作製したLED実装体の熱抵抗の測定結果は120℃/W、全光束量の測定結果は280mlmであった。
熱伝導粒子として、Ag粒子表面を800nm厚みのスチレン樹脂で被覆した平均粒径(D50)1μmの絶縁被覆粒子を用いた。前述の樹脂組成物にこの熱伝導粒子を50体積%配合し、熱伝導性を有する異方性導電接着剤を作製した。この異方性導電接着剤の硬化物の熱伝導率の測定結果は0.5W/(m・K)であり、配線間スペースが25μmときの耐電圧の試験結果は450Vであり、配線間スペースが100μmときの耐電圧の試験結果は500V超であった。また、この異方性導電接着剤を用いて作製したLED実装体の熱抵抗の測定結果は115℃/W、全光束量の測定結果は280mlmであった。
熱伝導粒子として、Ag粒子表面を100nm厚みのSiO2で被覆した平均粒径(D50)1μmの絶縁被覆粒子を用いた。実施例4と同様、前述の樹脂組成物にこの熱伝導粒子を50体積%配合し、熱伝導性を有する異方性導電接着剤を作製した。この異方性導電接着剤の硬化物の熱伝導率の測定結果は0.5W/(m・K)であり、配線間スペースが25μmときの耐電圧の試験結果は230Vであり、配線間スペースが100μmときの耐電圧の試験結果は500V超であった。また、この異方性導電接着剤を用いて作製したLED実装体の熱抵抗の測定結果は115℃/W、全光束量の測定結果は280mlmであった。
熱伝導粒子として、Ag/Pd合金粒子表面を100nm厚みのスチレン樹脂で被覆した平均粒径(D50)1.5μmの絶縁被覆粒子を用いた。前述の樹脂組成物にこの熱伝導粒子を50体積%配合し、熱伝導性を有する異方性導電接着剤を作製した。この異方性導電接着剤の硬化物の熱伝導率の測定結果は0.4W/(m・K)であり、配線間スペースが25μmときの耐電圧の試験結果は210Vであり、配線間スペースが100μmときの耐電圧の試験結果は500V超であった。また、この異方性導電接着剤を用いて作製したLED実装体の熱抵抗の測定結果は135℃/W、全光束量の測定結果は280mlmであった。
熱伝導粒子を配合せずに異方性導電接着剤を作製した。比較例1と同様、この異方性導電接着剤の硬化物の熱伝導率の測定結果は0.2W/(m・K)であり、配線間スペースが25μmときの耐電圧の試験結果は200Vであり、配線間スペースが100μmときの耐電圧の試験結果は500V超であった。また、この異方性導電接着剤を用いて作製したLED実装体の熱抵抗の測定結果は200℃/W、全光束量の測定結果は330mlmであった。
熱伝導粒子として、平均粒径(D50)1μmのAg粒子(熱伝導率:428W/(m・K))を用いた。前述の樹脂組成物にこの熱伝導粒子を50体積%配合し、熱伝導性を有する異方性導電接着剤を作製した。比較例2と同様、この異方性導電接着剤の硬化物の熱伝導率の測定結果は0.55W/(m・K)であり、配線間スペースが25μmときの耐電圧の試験結果は100Vであり、配線間スペースが100μmときの耐電圧の試験結果は200Vであった。また、この異方性導電接着剤を用いて作製したLED実装体の熱抵抗の測定結果は110℃/W、全光束量の測定結果は250mlmであった。
熱伝導粒子として、Ag粒子表面を1100nm厚みのスチレン樹脂で被覆した平均粒径(D50)1μmの絶縁被覆粒子を用いた。前述の樹脂組成物にこの熱伝導粒子を50体積%配合し、熱伝導性を有する異方性導電接着剤を作製した。この異方性導電接着剤の硬化物の熱伝導率の測定結果は0.4W/(m・K)であり、配線間スペースが25μmときの耐電圧の試験結果は300Vであり、配線間スペースが100μmときの耐電圧の試験結果は500V超であった。また、この異方性導電接着剤を用いて作製したLED実装体の熱抵抗の測定結果は190℃/W、全光束量の測定結果は300mlmであった。
Claims (12)
- 樹脂粒子の表面に導電性金属層が形成された導電性粒子と、前記導電性粒子よりも平均粒径が小さい熱伝導粒子とが接着剤成分に分散され、
前記熱伝導粒子が、金属粒子、又は金属粒子の表面に絶縁層が形成された絶縁被覆粒子である異方性導電接着剤。 - 前記金属粒子が、200W/(m・K)以上の熱伝導率を有する請求項1記載の異方性導電材料。
- 前記金属粒子が、Ag又はAgを主成分とする合金からなる請求項1又は2記載の異方性導電材料。
- 前記金属粒子の配合量が、5〜40体積%である請求項1乃至3のいずれか1項に記載の異方性導電接着剤。
- 前記絶縁被覆粒子の絶縁層の厚みが、20〜1000nmである請求項1乃至3のいずれか1項に記載の異方性導電接着剤。
- 前記絶縁被覆粒子の絶縁層が、樹脂又は無機材料からなる請求項1乃至5のいずれか1項に記載の異方性導電接着剤。
- 前記絶縁被覆粒子の配合量が、5〜50体積%である請求項6に記載の異方性導電接着剤。
- 前記熱伝導粒子の平均粒径が、前記導電性粒子の平均粒径の5〜80%である請求項1乃至7のいずれか1項に記載の異方性導電接着剤。
- 前記熱伝導粒子が、白又は灰色の無彩色である請求項1乃至8のいずれか1項に記載の異方性導電接着剤。
- 第1の電子部品の端子と、第2の電子部品の端子とが、樹脂粒子の表面に導電性金属層が形成された導電性粒子を介して電気的に接続されてなる接続構造体において、
前記第1の電子部品の端子と前記第2の電子部品の端子との間に、前記導電性粒子よりも平均粒径が小さい熱伝導粒子が捕捉されてなり、
前記熱伝導粒子が、金属粒子、又は金属粒子の表面に絶縁層が形成された絶縁被覆粒子である接続構造体。 - 第1の電子部品が、LED素子であり、
第2の電子部品が、基板である請求項10記載の接続構造体。 - 前記熱伝導粒子が、白又は灰色の無彩色である請求項10記載の接続構造体。
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JP7046351B2 (ja) | 2018-01-31 | 2022-04-04 | 三国電子有限会社 | 接続構造体の作製方法 |
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EP2899244A4 (en) | 2016-06-01 |
JP6066643B2 (ja) | 2017-01-25 |
CN104520398A (zh) | 2015-04-15 |
TWI597346B (zh) | 2017-09-01 |
CN104520398B (zh) | 2017-10-17 |
EP2899244A1 (en) | 2015-07-29 |
WO2014046088A1 (ja) | 2014-03-27 |
KR20150060705A (ko) | 2015-06-03 |
US20150197672A1 (en) | 2015-07-16 |
KR102096575B1 (ko) | 2020-04-02 |
TW201412934A (zh) | 2014-04-01 |
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