JP6134093B2 - 導電性微粉末および導電性微粉末分散液 - Google Patents
導電性微粉末および導電性微粉末分散液 Download PDFInfo
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Description
また、好ましくは、前記保護層が前記導電性微粉末全体に占める割合が0.01〜30質量%であることを特徴とする。
また、好ましくは、前記鱗片状金属微粒子は平均厚さが1〜100nmであり、平均長径が1〜10μmであることを特徴とする。
また、好ましくは、前記鱗片状微粒子は、アスペクト比が10以上、20000以下であることを特徴とする。
さらに好ましくは、前記保護層以外には実質的に分散剤を含まないことを特徴とする。
本実施形態の導電性微粉末分散液は、上記の導電性微粉末と溶媒とを有する。
厚さが12μmのポリエチレンテレフタレート(PET)フィルム上に、5質量%のCABを含む溶液をグラビアコートで塗工し、100℃以下で乾燥して、剥離層を形成した。CABの塗工量は0.06±0.01g/m2であった。剥離層上に、高周波誘導加熱・真空蒸着法によって、平均厚さが30nmの銀の薄膜を形成した。銀の厚さは、成膜中に膜の干渉を利用して測定した平均厚さである。次に、剥離層および銀層を形成したPETフィルム面に酢酸ブチルをスプレーして剥離層を溶解し、銀層をドクターブレードで掻き落とした。さらに、得られた銀粉と溶剤の混合物を、超音波ホモジナイザーを用いて、平均長径が約3μmとなるように粉砕した。これにより得られた導電性微粉末分散液を、遠心分離を用いて濃縮し、固形分濃度を15質量%として、実施例1の導電性微粒子分散液を得た。
実施例1と同じ方法を用いて、それぞれ、銅(実施例2)、ニッケル(実施例3)、クロム(実施例4)、錫(実施例5)、チタン(実施例6)、シリコン(実施例7)、インジウム錫酸化物(ITO)(実施例8)の鱗片状微粒子を含む導電性微粉末分散液および導電性微粉末を作製した。
フッ素樹脂基板上に、高周波誘導加熱・真空蒸着法によって平均厚さが30nmの銀の薄膜を形成した後、その表面に酢酸ブチルをスプレーして、銀層をドクターブレードで掻き落とした。さらに、得られた銀粉と溶剤の混合物を、超音波ホモジナイザーを用いて、平均長径が約3μmとなるように粉砕した。これにより得られた導電性微粉末分散液を、遠心分離を用いて濃縮し、固形分濃度を20質量%として、比較例1の導電性微粒子分散液を得た。
比較例1と同じ方法を用いて、ニッケルの鱗片状微粒子を含む導電性微粉末分散液および導電性微粉末を作製した。
Claims (5)
- 印刷用導電ペーストに用いられる鱗片状の導電性微粉末であって、
前記鱗片状微粒子は、平均厚さが1〜100nmであり、平均長径が1〜20μmであるとともに鱗片状微粒子の片面に前記鱗片形状を維持するための保護層が形成され、
前記鱗片状微粒子が、金、銀、銅、白金、ニッケル、クロム、錫、インジウム、チタン、シリコンからなる群から選ばれる1種以上の金属、その合金、またはその導電性を有する酸化物、炭化物もしくは窒化物からなり、
前記保護層がセルロースアセテートブチレートからなり、前記導電性微粉末全体に占める割合が1.2〜30質量%である
ことを特徴とする導電性微粉末。 - 前記鱗片状微粒子が銀からなる
ことを特徴とする請求項1に記載の導電性微粉末。 - 前記鱗片状微粒子は、アスペクト比が10以上、20000以下である
ことを特徴とする請求項1又は2記載の導電性微粉末。 - 請求項1〜3のいずれか一項に記載の導電性微粉末と、
溶媒とを有する
導電性微粉末分散液。 - 前記保護層以外には実質的に分散剤を含まない
ことを特徴とする請求項4に記載の導電性微粉末分散液。
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JP2013093131A JP2013093131A (ja) | 2013-05-16 |
JP6134093B2 true JP6134093B2 (ja) | 2017-05-24 |
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