JP6295025B2 - 導電パターン形成方法及び光焼成用インク - Google Patents
導電パターン形成方法及び光焼成用インク Download PDFInfo
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- Conductive Materials (AREA)
Description
平均粒径1 μmの大粒径銅粒子16gと平均粒径0.05μmの小粒径銅粒子スラリー(49質量%ターピネオールスラリー)8.16gおよび有機バインダーとしてエチルセルロース・ターピネオール溶液(日新化成製、12質量%)1.67gを混合し、3本ロールBR−100V(アイメックス株式会社製)にて混練したのち、自転・公転真空ミキサー あわとり練太郎ARV−310(株式会社シンキー製)を用いて減圧下(10kPa)1分間1000rpmで脱泡・撹拌し、光焼成用インクを調製し、実施例1とした(大粒径銅粒子と小粒径銅粒子の質量比は80:20、有機バインダー濃度は1質量%)。
上記実施例及び比較例にかかる光焼成用インクを使用し、ポリイミド基板(ユーピレックス−S50(宇部興産製))上にスクリーン印刷により、2cmx2cmの正方形パターンを印刷し、インクパターン(膜厚10μm)を形成した。
上記乾燥後のインクパターンに、NovaCentrix社PulseForge3300を使用し、照射時間2ミリ秒のパルス光を1パルス照射してインクパターンを焼成し、導電パターンを得た。パルス光の照射後、導電パターン(インクパターン)の飛散の有無及び導電パターンの抵抗値および体積抵抗率を測定した。抵抗値は3540ミリオームハイテスタ(日置電機株式会社製)を用いて2cmx2cmの正方形パターンの対角の抵抗値を測定した。また、体積抵抗率は低抵抗率計ロレスターGP(株式会社三菱化学アナリテック製)の4端子リニアプローブ(電極間隔1.5mm)を用いた四探針法により測定した。結果を表1に示す。
Claims (6)
- 平均粒径0.5〜4μmの第一の導電性付与粒子と平均粒径0.01〜0.5μmの第二の導電性付与粒子とを、第一の導電性付与粒子:第二の導電性付与粒子=70:30〜95:5の質量比で含み、第一の導電性付与粒子と第二の導電性付与粒子の平均粒径の粒径比が10〜100であって、有機バインダーの割合が前記第一および第二の導電性付与粒子と有機バインダーの合計質量に対して0.2〜2.0質量%である光焼成用インクを準備する光焼成用インク準備工程と、
前記光焼成用インクを基板上に印刷して光焼成用インクパターンを形成する印刷工程と、
前記光焼成用インクパターンに光を照射し、前記光焼成用インクパターン中の第一の導電性付与粒子及び第二の導電性付与粒子を焼成する焼成工程と、
を備え、
前記第一の導電性付与粒子及び第二の導電性付与粒子が、金、銀、銅、ニッケル、コバルト、亜鉛、錫、インジウム、ガリウム、アルミニウム、パラジウム、タンタル、ニオブまたは前記複数の金属の合金よりなる粒子または繊維、前記金属表面に金、パラジウム、銀がめっきされた金属粒子または繊維である導電パターン形成方法。 - 前記第一の導電性付与粒子の平均粒径が1〜4μm及び第二の導電性付与粒子の平均粒径が0.05〜0.1μmである請求項1に記載の導電パターン形成方法。
- 前記第一の導電性付与粒子及び第二の導電性付与粒子が銅粒子である請求項1に記載の導電パターン形成方法。
- 前記有機バインダーがエチルセルロースである請求項1から請求項3のいずれか一項に記載の導電パターン形成方法。
- 前記焼成工程をパルス光の照射により行う請求項1から請求項4のいずれか一項に記載の導電パターン形成方法。
- 平均粒径0.5〜4μmの第一の導電性付与粒子と平均粒径0.01〜0.5μmの第二の導電性付与粒子とを、第一の導電性付与粒子:第二の導電性付与粒子=70:30〜95:5の質量比で含み、第一の導電性付与粒子と第二の導電性付与粒子の平均粒径の粒径比が10〜100であり、有機バインダーの割合が前記第一および第二の導電性付与粒子と有機バインダーの合計質量に対して0.2〜2.0質量%であって、前記第一の導電性付与粒子及び第二の導電性付与粒子が、金、銀、銅、ニッケル、コバルト、亜鉛、錫、インジウム、ガリウム、アルミニウム、パラジウム、タンタル、ニオブまたは前記複数の金属の合金よりなる粒子または繊維、前記金属表面に金、パラジウム、銀がめっきされた金属粒子または繊維である光焼成用インク。
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