JPWO2016063941A1 - 導電性粒子、導電材料及び接続構造体 - Google Patents
導電性粒子、導電材料及び接続構造体 Download PDFInfo
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- JPWO2016063941A1 JPWO2016063941A1 JP2015555877A JP2015555877A JPWO2016063941A1 JP WO2016063941 A1 JPWO2016063941 A1 JP WO2016063941A1 JP 2015555877 A JP2015555877 A JP 2015555877A JP 2015555877 A JP2015555877 A JP 2015555877A JP WO2016063941 A1 JPWO2016063941 A1 JP WO2016063941A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
- H01B1/026—Alloys based on copper
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
- H01B5/16—Non-insulated conductors or conductive bodies characterised by their form comprising conductive material in insulating or poorly conductive material, e.g. conductive rubber
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- 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
Description
本発明に係る導電性粒子は、基材粒子と、銅を含む第1の導電部と、パラジウムを含む第2の導電部と、複数の芯物質とを備える。本発明に係る導電性粒子では、上記基材粒子の外表面上に上記第1の導電部が配置されており、上記第1の導電部の外表面上に上記第2の導電部が配置されている。本発明に係る導電性粒子では、上記第2の導電部が外表面に、複数の突起を有する。本発明に係る導電性粒子では、上記芯物質が、上記第2の導電部の上記突起の内側に配置されており、上記芯物質によって上記第2の導電部の外表面が隆起されている。上記芯物質により上記第2の導電部の外表面が隆起されていることによって、上記突起が形成されている。本発明に係る導電性粒子では、上記芯物質の材料がニッケルとは異なり、上記芯物質の材料のモース硬度が5を超える。
上記基材粒子としては、樹脂粒子、金属粒子を除く無機粒子、有機無機ハイブリッド粒子及び金属粒子等が挙げられる。上記基材粒子は、金属粒子を除く基材粒子であることが好ましく、樹脂粒子、金属粒子を除く無機粒子又は有機無機ハイブリッド粒子であることがより好ましい。上記基材粒子は、コアシェル粒子であってもよい。
上記導電性粒子は、導電部として、銅を含む第1の導電部を備える。第1の導電部には、金属として、銅のみを用いた場合だけでなく、銅と他の金属とを用いた場合も含まれる。上記銅層は、銅合金層であってもよい。
上記芯物質が上記導電部(導電層)中に埋め込まれていることによって、上記第2の導電部が外表面に、複数の突起を有するようにすることが容易である。
本発明に係る導電性粒子は、上記第2の導電部の外表面上に配置された絶縁物質を備えることが好ましい。この場合には、導電性粒子を電極間の接続に用いると、隣接する電極間の短絡を防止できる。具体的には、複数の導電性粒子が接触したときに、複数の電極間に絶縁物質が存在するので、上下の電極間ではなく横方向に隣り合う電極間の短絡を防止できる。なお、電極間の接続の際に、2つの電極で導電性粒子を加圧することにより、導電性粒子の導電部と電極との間の絶縁物質を容易に排除できる。
導電性粒子の腐食を抑え、電極間の接続抵抗を低くするために、上記第2の導電部の外表面は、酸化防止剤により防錆処理されていることが好ましい。
本発明に係る導電材料は、上述した導電性粒子と、バインダー樹脂とを含む。上記導電性粒子は、バインダー樹脂中に分散されて用いられることが好ましく、バインダー樹脂中に分散されて導電材料として用いられることが好ましい。上記導電材料は、異方性導電材料であることが好ましい。上記導電材料は、電極間の電気的な接続に用いられることが好ましい。上記導電材料は回路接続用導電材料であることが好ましい。
上記導電性粒子を用いて、又は上記導電性粒子とバインダー樹脂とを含む導電材料を用いて、接続対象部材を接続することにより、接続構造体を得ることができる。
(1)芯物質の付着工程
粒子径が3.0μmであるジビニルベンゼン共重合体樹脂粒子(積水化学工業社製「ミクロパールSP−203」)を基材粒子Aとして用意した。
硫酸銅(5水和物)40g/Lと、エチレンジアミン四酢酸(EDTA)100g/Lと、グルコン酸ナトリウム50g/Lと、ホルムアルデヒド25g/Lとを含み、かつpH10.5に調整された無電解めっき液を用意した。
得られた銅めっき粒子10gを、超音波処理機により、イオン交換水500mLに分散させ、粒子懸濁液を得た。
アルミナ粒子を二酸化チタン粒子(平均粒子径150nm、モース硬度7)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。
アルミナ粒子を炭化タングステン粒子(平均粒子径150nm、モース硬度9)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。
実施例1で得られた粒子に、防錆処理を施して、導電性粒子を得た。ベンゾトリアゾールを防錆剤として用いた。
実施例4と同様にして導電性粒子を得た。得られた導電性粒子を用いて、絶縁性粒子の付着工程を行った。
4ツ口セパラブルカバー、攪拌翼、三方コック、冷却管及び温度プローブが取り付けられた1000mLのセパラブルフラスコに、メタクリル酸メチル100mmolと、N,N,N−トリメチル−N−2−メタクリロイルオキシエチルアンモニウムクロライド1mmolと、2,2’−アゾビス(2−アミジノプロパン)二塩酸塩1mmolとを含むモノマー組成物を固形分率が5重量%となるようにイオン交換水に秤取した後、200rpmで攪拌し、窒素雰囲気下70℃で24時間重合を行った。反応終了後、凍結乾燥して、表面にアンモニウム基を有し、平均粒子径220nm及びCV値10%の絶縁性粒子を得た。
二酸化チタン粒子を金属ニッケル粒子スラリー(平均粒子径150nm、モース硬度5)に変更したこと以外は実施例4と同様にして、導電性粒子を得た。
基材粒子の粒子径と、芯物質の種類、材料のモース硬度及び平均径と、第1の導電部(銅層)の主金属、Cuの含有量、厚み及びビッカース硬度と、第2の導電部(パラジウム層)の主金属、Pdの含有量及び厚みと、絶縁物質の有無と、防錆処理の有無と、導電性粒子における突起の数とを下記の表1に示すように設定したこと以外は、実施例1と同様にして、実施例6〜19の導電性粒子を得た。
(1)第1の導電部及び第2の導電部における金属の含有量
集束イオンビームを用いて、得られた導電性粒子の薄膜切片を作製した。透過型電子顕微鏡FE−TEM(日本電子社製「JEM−2010FEF」)を用いて、エネルギー分散型X線分析装置(EDS)により、第1の導電部全体及び第2の導電部全体における金属の含有量を測定した。
得られた導電性粒子を含有量が10重量%となるように、三井化学社製「ストラクトボンドXN−5A」に添加し、分散させて、異方性導電ペーストを作製した。
○○:接続抵抗が2.0Ω以下
○:接続抵抗が2.0Ωを超え、3.0Ω以下
△:接続抵抗が3.0Ωを超え、5.0Ω以下
×:接続抵抗が5.0Ωを超える
上記(2)初期の接続抵抗の評価で得られた接続構造体を、85℃及び相対湿度85%の条件で放置した。放置開始から150時間後に、上記(2)初期の接続抵抗の評価と同様に電極間の接続抵抗を4端子法により測定した。信頼性試験後の接続抵抗を下記の基準で判定した。
○○:接続抵抗(放置前)の平均値に比べ、接続抵抗(放置後)の平均値が125%未満
○:接続抵抗(放置前)の平均値に比べ、接続抵抗(放置後)の平均値が125%以上、150%未満
△:接続抵抗(放置前)の平均値に比べ、接続抵抗(放置後)の平均値が150%以上、200%未満
×:接続抵抗(放置前)の平均値に比べ、接続抵抗(放置後)の平均値が200%以上
ビスフェノールA型エポキシ樹脂(三菱化学社製「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5重量%となるように添加し、分散させ、樹脂組成物を得た。
得られた接続構造体の接続部において、1000個の導電性粒子中のめっき割れが確認された導電性粒子の数を数えた。めっき割れを下記の基準で判定した。
○○:めっき割れが確認された粒子の数が1000個中10個以下
○:めっき割れが確認された粒子の数が1000個中10個を超え、50個以下
△:めっき割れが確認された粒子の数が1000個中50個を超え、200個以下
×:めっき割れが確認された粒子の数が1000個中200個を超える
1a,1Aa…突起
2…基材粒子
3,3A…第1の導電部
3a…突起
4,4A…第2の導電部
4a,4Aa…突起
5…芯物質
6…絶縁物質
51…接続構造体
52…第1の接続対象部材
52a…第1の電極
53…第2の接続対象部材
53a…第2の電極
54…接続部
Claims (9)
- 基材粒子と、銅を含む第1の導電部と、パラジウムを含む第2の導電部と、複数の芯物質とを備え、
前記基材粒子の外表面上に前記第1の導電部が配置されており、前記第1の導電部の外表面上に前記第2の導電部が配置されており、
前記第2の導電部が外表面に複数の突起を有し、
前記芯物質が、前記第2の導電部の前記突起の内側に配置されており、前記芯物質によって前記第2の導電部の外表面が隆起されており、
前記芯物質の材料がニッケルとは異なり、前記芯物質の材料のモース硬度が5を超える、導電性粒子。 - 前記第1の導電部と前記第2の導電部との合計の厚みの前記芯物質の平均径に対する比が0.1以上、6以下である、請求項1に記載の導電性粒子。
- 前記第1の導電部の厚みが、20nm以上、300nm以下である、請求項1又は2に記載の導電性粒子。
- 前記芯物質の平均径が20nm以上、1000nm以下である、請求項1〜3のいずれか1項に記載の導電性粒子。
- 前記第2の導電部の厚みが3nm以上、40nm以下である、請求項1〜4のいずれか1項に記載の導電性粒子。
- 前記第1の導電部のビッカース硬度が100未満である、請求項1〜5のいずれか1項に記載の導電性粒子。
- 前記芯物質の材料のモース硬度が6以上である、請求項1〜6のいずれか1項に記載の導電性粒子。
- 請求項1〜7のいずれか1項に記載の導電性粒子と、バインダー樹脂とを含む、導電材料。
- 第1の電極を表面に有する第1の接続対象部材と、
第2の電極を表面に有する第2の接続対象部材と、
前記第1の接続対象部材と前記第2の接続対象部材とを接続している接続部とを備え、
前記接続部の材料が、請求項1〜7のいずれか1項に記載の導電性粒子であるか、又は前記導電性粒子とバインダー樹脂とを含む導電材料であり、
前記第1の電極と前記第2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。
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