JP4804596B1 - 導電性粒子、導電性粒子の製造方法、異方性導電材料及び接続構造体 - Google Patents
導電性粒子、導電性粒子の製造方法、異方性導電材料及び接続構造体 Download PDFInfo
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- JP4804596B1 JP4804596B1 JP2011520478A JP2011520478A JP4804596B1 JP 4804596 B1 JP4804596 B1 JP 4804596B1 JP 2011520478 A JP2011520478 A JP 2011520478A JP 2011520478 A JP2011520478 A JP 2011520478A JP 4804596 B1 JP4804596 B1 JP 4804596B1
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- H01R4/04—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation using electrically conductive adhesives
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- H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
- H01R11/01—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts characterised by the form or arrangement of the conductive interconnection between the connecting locations
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Abstract
導電性粒子(1)は、導電層(3)を少なくとも外表面(1a)に有する。1gの導電性粒子(1)をイオン交換水10mLに加えた液を、密封下において121℃で24時間加熱したときに、加熱後の液における水相中の有機酸の濃度は導電性粒子に換算して300μg/g以下である。接続構造体(21)は、電極(22a)を有する第1の接続対象部材(22)と、電極(23a)を有する第2の接続対象部材(23)と、該第1,第2の接続対象部材(22,23)を接続している接続部(24)とを備える。接続部(24)は、導電性粒子(1)により形成されているか、又は該導電性粒子(1)とバインダー樹脂とを含む異方性導電材料により形成されている。電極(22a)と電極(23a)とは、導電性粒子(1)により電気的に接続されている。
【選択図】図1
Description
図1に、本発明の一実施形態に係る導電性粒子を断面図で示す。
基材粒子2が金属粒子である場合に、該金属粒子を形成するための金属としては、銀、銅、ニッケル、ケイ素、金及びチタン等が挙げられる。
導電性粒子1を得る際の基材粒子2の表面2aに導電層3を形成する方法は特に限定されない。導電層3を形成する方法としては、例えば、無電解めっきによる方法、電気めっきによる方法、物理的蒸着による方法、並びに金属粉末もしくは金属粉末とバインダーとを含むペーストを基材粒子2の表面2aにコーティングする方法等が挙げられる。上記物理的蒸着による方法としては、真空蒸着、イオンプレーティング及びイオンスパッタリング等の方法が挙げられる。なかでも、導電層3の形成が簡便であり、かつ均一な導電層3を形成できるので、無電解めっきによる方法が好ましい。
本発明に係る異方性導電材料は、本発明の導電性粒子と、バインダー樹脂とを含む。
図2は、本発明の一実施形態に係る導電性粒子を用いた接続構造体の一例を模式的に示す断面図である。
導電性粒子の作製:
平均粒子径が5.0μm、変動係数が4.9%であるジビニルベンゼン系樹脂粒子(積水化学工業社製「ミクロパールSP−205」)を用意した。この粒子を用いて、以下の無電解ニッケルめっき工程を行った。
得られた無電解ニッケルめっき粒子に対して、置換めっき法によりニッケル層の表面に金めっきを施すことで、樹脂粒子の表面に、ニッケル層と、該ニッケル層の表面に積層された金層とを有する二層構造の導電層を形成し、導電性粒子を作製した。
ニッケルめっき液の有機酸の濃度又はpHを下記の表1に示すように変更したこと以外は実施例1と同様にして、導電性粒子を得た。
ニッケル層の表面に金層を形成しなかったこと以外は実施例1と同様にして、導電性粒子を作製した。
ニッケルめっき液の有機酸の濃度を下記の表1に示すように変更したこと以外は実施例1と同様にして、導電性粒子を得た。
ニッケルめっき液の有機酸の濃度を下記の表1に示すように変更したこと以外は実施例5と同様にして、導電性粒子を得た。
ニッケルめっき液の有機酸の濃度を下記の表1に示すように変更したこと以外は実施例1と同様にして、導電性粒子を得た。
(1)有機酸の濃度の測定
開口を有する石英管を用意し、洗浄した。この石英管内に、得られた導電性粒子1gと、イオン交換水(比抵抗18MΩ)10mLとを入れた。次に、ガスバーナーにより石英管の開口を溶融し、密封し、試験体を得た。121℃のオーブン内に試験体を入れ、121℃で24時間加熱した。その後、石英管を開封した。石英管内の加熱後の液を0.1μmのメンブランフィルターでろ過し、加熱後の液における水相を取り出した。ろ過した水相中の有機酸の濃度をイオンクロマトグラフ装置(DIONEX社製「ICS−3000」)を用いて測定した。
(異方性導電フィルムの作製)
ビスフェノールA型エポキシ樹脂(三菱化学(旧ジャパンエポキシレジン)社製「エピコート1009」)10重量部と、アクリルゴム(重量平均分子量約80万)40重量部と、メチルエチルケトン200重量部と、マイクロカプセル型硬化剤(旭化成ケミカルズ社製「HX3941HP」)50重量部と、シランカップリング剤(東レダウコーニングシリコーン社製「SH6040」)2重量部とを混合し、導電性粒子を含有量が3重量%となるように添加し、分散させ、樹脂組成物を得た。
得られた異方性導電フィルムを5mm×5mmの大きさに切断した。切断した異方性導電フィルムを、一方に抵抗測定用の配線を有する下記の表1に示す種類の電極(高さ0.2μm、ライン・アンド・スペースL/S=20μm/20μm)を上面に有するガラス基板(幅200μm、長さ1mm)の電極側のほぼ中央に貼り付けた。次いで、同じ電極を下面に有する2層フレキシブルプリント基板(幅200μm、長さ1mm)を、電極が重なるように位置合わせをしてから貼り合わせた。このガラス基板と2層フレキシブルプリント基板との積層体を、10N及び180℃の圧着条件で熱圧着し、接続構造体1を得た。
得られた異方性導フィルムを2mm×25mmの大きさに切断した。切断した異方性導電フィルムを、一方に抵抗測定用の配線を有する下記の表1に示す種類の電極(高さ0.2μm、ライン・アンド・スペースL/S=20μm/20μm)を上面に有するガラス基板(10mm×25mm×0.8mm)の電極側に貼り付けた。次いで、金電極を下面に有する二層フレキシブルプリント基板(30mm×20mm、ライン・アンド・スペースL/S=20μm/20μm)を、電極が重なるように位置合わせをしてから貼り合わせた。このガラス基板と二層フレキシブルプリント基板との積層体を、3MPa及び180℃の圧着条件で圧着し、接続構造体2を得た。
得られた接続構造体1,2の対向する電極間の接続抵抗値を4端子法により測定した。10個の接続構造体1の接続抵抗値の平均値、及び10個の接続構造体2の接続抵抗値の平均値をそれぞれ求めて、初期の接続抵抗値を下記の基準で判定した。
○○:接続抵抗値が2.0Ω以下
○:接続抵抗値が2.0Ωを超え、3.0Ω以下
△:接続抵抗値が3.0Ωを超え、5.0Ω以下
×:接続抵抗値が5.0Ωを超える
上記(2)初期の接続抵抗値の評価で得られた接続構造体1,2を85℃、85%の高温高湿下に1000時間放置した。その後、経時後の接続構造体1,2の対向する電極間の接続抵抗値を4端子法により測定した。10個の接続構造体1の接続抵抗値の平均値、及び10個の接続構造体2の接続抵抗値の平均値をそれぞれ求めて、経時後の接続抵抗値を上記(2)初期の接続抵抗値と同様の判定基準で判定した。
1a…外表面
2…基材粒子
2a…表面
3…導電層
21…接続構造体
22…第1の接続対象部材
22a…電極
22b…上面
23…第2の接続対象部材
23a…電極
23b…下面
24…接続部
Claims (6)
- 導電層を少なくとも外表面に有する導電性粒子であって、
導電性粒子1gをイオン交換水10mLに加えた液を、密封下において121℃で24時間加熱したときに、加熱後の液における水相中の有機酸の濃度が導電性粒子に換算して300μg/g以下である、導電性粒子。 - 基材粒子と、該基材粒子の表面を被覆している前記導電層とを有する、請求項1に記載の導電性粒子。
- 請求項1又は2に記載の導電性粒子の製造方法であって、
有機酸を6000μg/g以下で含みかつpHが5.2〜8.5である無電解めっき液を用いて、無電解めっきにより前記導電層を形成する、導電性粒子の製造方法。 - 請求項1又は2に記載の導電性粒子と、バインダー樹脂とを含む、異方性導電材料。
- 電極を有する第1の接続対象部材と、電極を有する第2の接続対象部材と、該第1,第2の接続対象部材を接続している接続部とを備え、
前記接続部が、請求項1又は2に記載の導電性粒子により形成されているか、又は該導電性粒子とバインダー樹脂とを含む異方性導電材料により形成されており、
前記第1の接続対象部材の電極と前記第2の接続対象部材の電極とが、前記導電性粒子により電気的に接続されている、接続構造体。 - 前記第1,第2の接続対象部材の電極がそれぞれ、IZO電極、AZO電極、GZO電極又はZnO電極である、請求項5に記載の接続構造体。
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