JP6119130B2 - 複合粒子及び異方導電性接着剤 - Google Patents
複合粒子及び異方導電性接着剤 Download PDFInfo
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- JP6119130B2 JP6119130B2 JP2012155877A JP2012155877A JP6119130B2 JP 6119130 B2 JP6119130 B2 JP 6119130B2 JP 2012155877 A JP2012155877 A JP 2012155877A JP 2012155877 A JP2012155877 A JP 2012155877A JP 6119130 B2 JP6119130 B2 JP 6119130B2
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Description
(1)官能基を有する母粒子12を、高分子電解質を含む溶液に分散させ、官能基を有する母粒子12の表面の少なくとも一部に高分子電解質を吸着させてリンスする工程と、
(2)高分子電解物質を吸着させた母粒子12を、子粒子13を含む分散液に分散させ、高分子電解物質を吸着させた、官能基を有する母粒子12の表面の少なくとも一部に子粒子13を吸着させて、リンスする工程と、
を含む。上記の方法により、表面に高分子電解質と子粒子13とが積層された複合粒子14を製造できる。
架橋度を調整したジビニルベンゼンとアクリル酸との共重合体からなり、表面にカルボキシル基を有するプラスチック核体を10g準備した。プラスチック核体の平均粒径は2.6μmであった。
500mlフラスコに入った純水400g中にスチレン600mmol、開始剤としてペルオキソ二硫酸カリウム6mmol及び3−メタクリロキシプロピルトリメトキシシラン30mmolを加え、更に粒子径制御剤としてスチレンスルホン酸を微量添加し、80℃で撹拌しながら6時間加熱を行った。攪拌速度は200min−1(rpm)であった。
3−メタクリロキシプロピルトリメトキシシランの量を20mmolにした以外は絶縁粒子1と同様の方法で絶縁粒子2を作製した。
3−メタクリロキシプロピルトリメトキシシランの量を10mmolにした以外は絶縁粒子1と同様の方法で絶縁粒子3を作製した。
3−メタクリロキシプロピルトリメトキシシランの量を5mmolにした以外は絶縁粒子1と同様の方法で絶縁粒子4を作製した。
3−メタクリロキシプロピルトリメトキシシランの量を0mmolにした以外は絶縁粒子1と同様の方法で絶縁粒子5を作製した。
3−メタクリロキシプロピルトリメトキシシランの量を40mmolにした以外は絶縁粒子1と同様の方法で絶縁粒子6を作製した。
3−メタクリロキシプロピルトリメトキシシランの量を50mmolにした以外は絶縁粒子1と同様の方法で絶縁粒子7を作製した。
攪拌装置、コンデンサー及び温度計を備えたガラスフラスコに、3−グリシドキシプロピルトリメトキシシラン118gとメタノール5.9gを配合した溶液を加えた。さらに活性白土5g及び蒸留水4.8gを添加し、75℃で一定時間攪拌した後、重量平均分子量1,300のシリコーンオリゴマーを得た。得られたシリコーンオリゴマーは、水酸基と反応する末端官能基としてメトキシ基又はシラノール基を有するものである。得られたシリコーンオリゴマー溶液にメタノールを加えて、固形分20重量%の処理液を調製した。
GPC条件
ポンプ:日立 L−6000型((株)日立製作所社製、商品名)
カラム:Gelpack GL−R420、Gelpack GL−R430、Gelpack GL−R440(以上、(株)日立化成工業社製、商品名)
溶離液:テトラヒドロフラン(THF)
測定温度:40℃
流量:2.05mL/分
検出器:日立 L−3300型RI((株)日立製作所社製、商品名)
(絶縁被覆導電粒子1)
メルカプト酢酸8mmolをメタノール200mlに溶解させて反応液を調製した。次に導電粒子1を10g上記反応液に加え、室温で2時間スリーワンモーターと直径45mmの攪拌羽で攪拌した。メタノールで洗浄後、孔径3μmのメンブレンフィルタ(ミリポア社製)を用いて濾過することで、表面にカルボキシル基を有する導電粒子1を10g得た。
絶縁粒子1の代わりに絶縁粒子2を用いたこと以外は絶縁被覆導電粒子1と同様の方法で絶縁被覆導電粒子2を作製した。
絶縁粒子1の代わりに絶縁粒子3を用いたこと以外は絶縁被覆導電粒子1と同様の方法で絶縁被覆導電粒子3を作製した。
絶縁粒子1の代わりに絶縁粒子4を用いたこと以外は絶縁被覆導電粒子1と同様の方法で絶縁被覆導電粒子4を作製した。
絶縁粒子1の代わりに絶縁粒子5を用いたこと以外は絶縁被覆導電粒子1と同様の方法で絶縁被覆導電粒子5を作製した。
絶縁粒子1の代わりに絶縁粒子6を用いたこと以外は絶縁被覆導電粒子1と同様の方法で絶縁被覆導電粒子6を作製した。
絶縁粒子1の代わりに絶縁粒子7を用いたこと以外は絶縁被覆導電粒子1と同様の方法で絶縁被覆導電粒子7を作製した。
酢酸エチルとトルエンを重量比1:1で混合した溶媒300gに、フェノキシ樹脂(ユニオンカーバイド社製、商品名:PKHC)100gと、アクリルゴム(ブチルアクリレート40重量部、エチルアクリレート30重量部、アクリロニトリル30重量部、グリシジルメタクリレート3重量部の共重合体、重量平均分子量:85万)75gとを溶解し、溶液を得た。この溶液にマイクロカプセル型潜在性硬化剤を含有する液状エポキシ(エボキシ当量185、旭化成エポキシ株式会社製、商品名:ノバキュアHX−3941)300gと、液状エポキシ樹脂(油化シェルエポキシ株式会社製、商品名:YL980)400gとを加えて撹拌した。得られた混合液に平均粒径が14nmのシリカを溶剤分散したシリカスラリー(日本アエロジル社製、商品名:R202)を加えて接着剤溶液1を調製した。シリカスラリーは、上記混合液の固形分全量に対してシリカ固形分の含有量が5重量%となるように加えた。
絶縁被覆導電粒子1の代わりに絶縁被覆導電粒子2を用いた以外は実施例1と同様の方法で異方導電性接着剤フィルムDを作製した。
絶縁被覆導電粒子1の代わりに絶縁被覆導電粒子3を用いた以外は実施例1と同様の方法で異方導電性接着剤フィルムDを作製した。
絶縁被覆導電粒子1の代わりに絶縁被覆導電粒子4を用いた以外は実施例1と同様の方法で異方導電性接着剤フィルムDを作製した。
絶縁被覆導電粒子1の代わりに絶縁被覆導電粒子6を用いた以外は実施例1と同様の方法で異方導電性接着剤フィルムDを作製した。
絶縁被覆導電粒子1の代わりに絶縁被覆導電粒子5を用いた以外は実施例1と同様の方法で異方導電性接着剤フィルムDを作製した。
絶縁被覆導電粒子1の代わりに絶縁被覆導電粒子7を用いた以外は実施例1と同様の方法で異方導電性接着剤フィルムDを作製した。
実施例及び比較例で作製した異方導電性接着剤フィルムの絶縁抵抗試験及び導通抵抗試験を行った。異方導電性接着剤フィルムは金属バンプ間の絶縁抵抗が高く、金属バンプ/ガラス側電極間の導通抵抗が低いことが重要である。金属バンプ間の絶縁抵抗に関しては初期値の測定を行い、絶縁抵抗の値は20サンプルの平均値より算出した。また、絶縁抵抗>109(Ω)を良品とした場合の歩留まりを算出した。なお、バンプ間の距離は10μmであった。また、金属バンプ/ガラス側電極間の導通抵抗に関しては初期値及び吸湿耐熱試験後の値を測定し、導通抵抗の値は14サンプルの平均値をより算出した。なお、吸湿耐熱試験は、気温85℃、湿度85%の条件で500時間放置することにより行った。
絶縁粒子の被覆率及び被覆ばらつきは、絶縁被覆導電粒子の作製直後及び溶剤分散後のSEM写真を撮影し画像解析し、上述の方法により算出した。
Claims (7)
- 母粒子と、該母粒子の外側に付着された複数の子粒子と、を備える複合粒子であって、 前記母粒子は平均粒径が1〜10μmの球状粒子であり、
前記子粒子は140nm以上500nm以下の平均最大粒径を有し、かつ平均最大粒径の20〜80%の範囲の平均最大厚みを有する赤血球形状の半円型粒子である、複合粒子。 - 前記母粒子が、プラスチック核体と、該プラスチック核体を被覆する導電性被膜とを有する、請求項1に記載の複合粒子。
- 前記子粒子が、有機無機ハイブリッド型粒子である、請求項1又は2に記載の複合粒子。
- 前記子粒子が、高分子電解質を介して前記母粒子の外側に付着される、請求項1〜3のいずれか一項に記載の複合粒子。
- 前記子粒子及び前記母粒子が、それぞれ前記高分子電解質と反応する官能基を表面に有する、請求項4に記載の複合粒子。
- 前記子粒子が、炭素間の二重結合を有する有機モノマー、及び炭素間の二重結合を有するアルコキシシランを少なくとも含む単量体組成物を重合した共重合体を含む、請求項1〜5のいずれか一項に記載の複合粒子。
- 請求項2〜6のいずれか一項に記載の複合粒子を含む、異方導電性接着剤。
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