JP6245792B2 - 導電性粒子、回路接続材料、実装体、及び実装体の製造方法 - Google Patents
導電性粒子、回路接続材料、実装体、及び実装体の製造方法 Download PDFInfo
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Description
1.導電性粒子
2.回路接続材料
3.実装体及び実装体の製造方法
4.実施例
本発明に係る導電性粒子は、銅若しくは銅合金、又は銀若しくは銀合金からなる導電層と、導電層上に形成されたニッケル又はニッケル合金からなる表面層とを有する。導電層は、銅若しくは銅合金、又は銀若しくは銀合金からなる金属コア粒子であってもよく、他の金属コア粒子又は樹脂コア粒子の表面を被覆した被覆層であってもよい。
本実施の形態における回路接続材料は、バインダー樹脂と、バインダー樹脂に分散された導電性粒子とを備え、導電性粒子は、銅若しくは銅合金、又は銀若しくは銀合金からなる導電層と、導電層上に形成されたニッケル又はニッケル合金からなる表面層とを有する。バインダー樹脂は、特に制限されないが、より好ましくは、膜形成樹脂と、重合性樹脂と、硬化剤と、シランカップリング剤とを含有する。
図3は、本実施の形態における実装体を示す断面図である。本実施の形態における実装体は、第1の電子部品30と第2の電子部品40とが、銅若しくは銅合金、又は銀若しくは銀合金からなる導電層と、前記導電層上に形成されたニッケル又はニッケル合金からなる表面層とを有する導電性粒子10によって電気的に接続されてなるものである。
以下、本発明の実施例について説明するが、本発明はこれらの実施例に限定されるものではない。
エポキシ接着剤に導電性粒子を分散させて硬化させ、研磨機(丸本ストルアス社製)にて粒子断面を削り出した。この粒子断面をSEM(Scanning Electron Microscope)(キーエンス社製、VE−8800)にて観察し、導電層の厚さ及び表面層の厚さを測定した。
マイクロカプセル型アミン系硬化剤(旭化成ケミカルズ社製、商品名ノバキュアHX3941HP)50部、液状エポキシ樹脂(ジャパンエポキシレジン社製、商品名EP828)14部、フェノキシ樹脂(東都化成社製、商品名YP50)35部、及びシランカップリング剤(信越化学社製、商品名KBE403)1部を含む熱硬化性バインダー樹脂に、実施例及び比較例の導電性粒子を体積比率10%になるように分散させた。この接着剤組成物を、シリコーン処理された剥離PETフィルム上に厚み35μmになるように塗布し、シート状の異方性導電フィルムを作製した。
各異方性導電フィルムを用いてCOF(評価用基材、200μmP、Cu8μmt-Snめっき、38μmt-S’perflex基材)とPWB(評価用基材、200μmP、Cu35μmt-Auめっき、FR-4基材)の接続を行なった。先ず、2.0mm幅にスリットされた異方性導電フィルムをPWBに貼り付け(条件:80℃-1MPa-1sec)、その上にCOFを位置あわせした後、圧着条件190℃−3MPa−10sec、緩衝材250μmtシリコンラバー、2.0mm幅加熱ツールにて圧着を行い、実装体を完成させた。
各異方性導電フィルムを用いてCOF(評価用基材、50μmP、Cu8μmt-Snめっき、38μmt-S’perflex基材)とノンアルカリガラス(評価用基材、0.7mmt)の接続を行なった。先ず、2.0mm幅にスリットされた異方性導電フィルムをノンアルカリガラスに貼り付け(条件:80℃-1MPa-1sec)、その上にCOFを位置あわせした後、圧着条件190℃−3MPa−10sec、緩衝材250μmtシリコンラバー、2.0mm幅加熱ツールにて圧着を行い、実装体を完成させた。
各実装体についてデジタルマルチメータ(品番:デジタルマルチメータ7555、横河電機社製)を用いて4端子法にて電流1mAを流したときの導通抵抗値の測定をおこなった。
図5に示すように、各実装体について、V−I測定を行い電流特性の評価を実施した。実装体は、PWB61に形成されたPWB導体パターン62と、COFに形成されたCOF導体パターン64とが異方性導電フィルム63を介して接続されている。PWB導体パターン62とCOF導体パターン64との間に、10mA/secで電流をかけていき、V−I特性評価を行った。V−I測定で直線(比例関係)から外れる電流値を読み取り耐電流性を評価した。電流値が500mA以上を○、及び200mA以上500mA未満を△と評価した。
各導電性粒子を小瓶にとりわけ、開放状態で常温環境中に1ヶ月放置し、目視により、導電性粒子の変色状態の確認を行った。変色が無かったものを○、変色が有ったものを×と評価した。
図6に示すように、ノンアルカリガラス71とCOFとが異方性導電フィルム74で接着された実装体において、隣接するCOF端子72、73間に電圧DC50Vを印加し、温度60℃、湿度95%のオーブンで環境試験を行った。500h後に顕微鏡にて腐食(マイグレーション)の確認を行った。マイグレーションの発生が無かったものを○、マイグレーションの発生が有ったものを×と評価した。
樹脂コアの表面に導電層としてAgめっきを施し、その上に表面層としてNiめっきを施し、導電性粒子を作製した。導電層の厚みは0.10μmであり、表面層の厚みは0.10μmであった。この導電性粒子を含有する異方性導電フィルムを作製し、さらに異方性導電フィルム用いて実装体を作製し、上述のように接続抵抗、信頼性、耐電流性、保存安定性、及び耐腐食性を評価した。
導電層の厚みが0.15μmであった以外は、実施例1と同様に導電性粒子を作製し、評価を行った。
導電層の厚みが0.20μmであった以外は、実施例1と同様に導電性粒子を作製し、評価を行った。
導電層としてCuめっきを施し、導電層の厚みが0.07μmであった以外は、実施例1と同様に導電性粒子を作製し、評価を行った。
導電層としてCuめっきを施し、導電層の厚みが0.10μmであった以外は、実施例1と同様に導電性粒子を作製し、評価を行った。
導電層としてCuめっきを施し、導電層の厚みが0.15μmであった以外は、実施例1と同様に導電性粒子を作製し、評価を行った。
導電層としてCuめっきを施し、導電層の厚みが0.20μmであった以外は、実施例1と同様に導電性粒子を作製し、評価を行った。
導電層としてCuめっきを施し、導電層の厚みが0.10μmであり、表面層の厚みが0.20μmであった以外は、実施例1と同様に導電性粒子を作製し、評価を行った。
導電層としてCuめっきを施し、表面層に突起を形成した以外は、実施例1と同様に導電性粒子を作製し、評価を行った。
樹脂コアの表面に表面層として厚み0.10μmのAgめっきを施し、導電性粒子を作製した以外は、実施例1と同様に評価を行った。
樹脂コアの表面に表面層として厚み0.10μmのCuめっきを施し、導電性粒子を作製した以外は、実施例1と同様に評価を行った。
樹脂コアの表面に表面層として厚み0.10μmのNiめっきを施し、導電性粒子を作製した以外は、実施例1と同様に評価を行った。
Claims (4)
- 電極間の接続に用いられる導電性粒子であって、
樹脂粒子と、
前記樹脂粒子上に形成された銀若しくは銀合金からなる導電層と、
前記導電層上に形成された外部に露出するニッケル又はニッケル合金からなる突起を有さない表面層とを有する導電性粒子。 - バインダー樹脂と、前記バインダー樹脂に分散された導電性粒子とを備え、
前記導電性粒子は、樹脂粒子と、前記樹脂粒子上に形成された銀若しくは銀合金からなる導電層と、前記導電層上に形成された外部に露出するニッケル又はニッケル合金からなる突起を有さない表面層とを有する回路接続材料。 - 第1の電子部品と第2の電子部品とが、樹脂粒子と、前記樹脂粒子上に形成された銀若しくは銀合金からなる導電層と、前記導電層上に形成された外部に露出するニッケル又はニッケル合金からなる突起を有さない表面層とを有する導電性粒子によって電気的に接続されてなる実装体。
- 樹脂粒子と、前記樹脂粒子上に形成された銀若しくは銀合金からなる導電層と、前記導電層上に形成された外部に露出するニッケル又はニッケル合金からなる突起を有さない表面層とを有する導電性粒子がバインダー樹脂に分散された回路接続材料を第1の電子部品の端子上に貼付け、
前記回路接続材料上に第2の電子部品を仮配置させ、
前記第2の電子部品上から加熱押圧装置により押圧し、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を接続させる実装体の製造方法。
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US14/386,707 US20150047878A1 (en) | 2012-03-29 | 2013-03-22 | Electroconductive particle, circuit connecting material, mounting body, and method for manufacturing mounting body |
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