JPWO2017022523A1 - 導電性組成物 - Google Patents
導電性組成物 Download PDFInfo
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- JPWO2017022523A1 JPWO2017022523A1 JP2017510424A JP2017510424A JPWO2017022523A1 JP WO2017022523 A1 JPWO2017022523 A1 JP WO2017022523A1 JP 2017510424 A JP2017510424 A JP 2017510424A JP 2017510424 A JP2017510424 A JP 2017510424A JP WO2017022523 A1 JPWO2017022523 A1 JP WO2017022523A1
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Abstract
Description
また、特許文献4では、半導体装置に用いられる、無機フィラーとして銀を好ましく用いる接着剤組成物において、フラックスとしてチオールやチオエーテルを用いることが記載されているが、銀は高価かつイオンマイグレーションしやすいために、電極間に意図しない短絡を生じさせるリスクが大きい。
すなわち本発明は、少なくとも下記一般式(1)で示されるスルフィド化合物と、少なくともCu、Sn、Niのいずれかを含む金属粒子を必須成分として含む導電性組成物に関する。
(Rは少なくとも炭素を含む有機基であり、R’はRと同一もしくは異なる有機基である。なお、RとR’は結合していてもよい。)
一般式(1)
さらに、前記スルフィド化合物は、ビニル基、アクリロイル基、1級アミノ基、2級アミノ基、フェノール性水酸基、チオール基、ヒドロシリル基、ヒドロホウ素基、マレイン酸エステル基、マレイン酸アミド基、マレイン酸イミド基の少なくともいずれかを有する化合物であることが好ましい。
さらに、前記スルフィド化合物の数平均分子量は、200以上であることが好ましい。
ここで、前記熱硬化性樹脂が、イミド基を1分子に2単位以上含むマレイン酸イミド化合物を含むことが好ましい。
さらに、前記マレイン酸イミド化合物が、C10以上の脂肪族アミンに由来する骨格を含むことが好ましい。
さらに、前記マレイン酸イミド化合物の数平均分子量が、3000以上であることが好ましい。
さらに、前記熱硬化性樹脂が、エポキシ樹脂であることも好ましい。
さらに、前記金属粒子が、相互に金属間化合物形成が可能な組み合わせを含む2種以上の金属の混合物であることが好ましい。
さらに、前記2種以上の金属粒子の少なくとも2種が、Cu、Ag、Ni、Ti、Al、Sn、Zn、Au、Inから選択されるものであることが好ましい。
また、本発明は上記導電性接着剤組成物を基材への塗布乾燥や、押し出し、その他の方法にて膜状に成形された導電性接着フィルムに関する。
くわえて、本発明は、上記導電性接着フィルムと、粘着テープとを貼り合せてなる、ダイシングダイボンディングフィルムに関する。
(Rは少なくとも炭素を含む有機基であり、R’はRと同一もしくは異なる有機基である。なお、RとR’は結合していても、すなわち、いわゆる環状スルフィドであってもよい。)
一般式(1)
フラックスとして、一般式(1)で示されるスルフィド化合物を用いることは、従来フラックスとして一般的なカルボン酸或いはアルコールと比較して、極めて吸湿しにくい点で好ましい。
金属粒子としては、少なくとも1部が、Cu、Ag、Au、Ni、Snのいずれかを含むことが好ましい。
本願発明における導電性組成物には、さらに熱硬化性樹脂を含有することが好ましい。熱硬化性樹脂は焼結前のフィルム性および焼結後の熱サイクルによって発生する応力等に対する緩和性を付与する効果を有する。
図1は、本願発明にかかるダイシングダイボンディングフィルム10を示す断面図である。ダイシングダイボンディングフィルム10は、主にダイシングテープ12、接着フィルム13から構成されている。ダイシングダイボンディングフィルム10は、半導体加工用テープの一例であり、使用工程や装置にあわせて予め所定形状に切断(プリカット)されていてもよいし、半導体ウエハ1枚分ごとに切断されていてもよいし、長尺のロール状を呈していてもよい。
剥離処理PET11は、ダイシングテープ12を覆っており、粘着剤層12bや接着フィルム13を保護している。
半導体装置の製造にあたり、本発明のダイシングダイボンディングフィルム10を好適に使用することができる。
導体装置が得られる。
上記実施形態においては、本願発明の導電性組成物を、導電性接着剤組成物として接着フィルム13の形態として用いる例を示したが、導電性組成物に配合する熱硬化性樹脂の量を減らす、あるいは熱硬化性樹脂を配合せずに、はんだ等の用途としてペースト状の形態で用いることもできる。具体的には、スクリーン印刷やディスペンサ等によって塗布することにより、電子部品の接続に供することができる。
表1の組成にて、金属粒子92wt%、樹脂4.5wt%、フラックス3.5wt%の混合物に、トルエンを加えてスラリー化したものをプラネタリーミキサーにて撹拌の後、離形処理されたPET上に薄く塗って120℃で乾燥させ、厚さ40μmの接着フィルムを得た。また、表中、BMI−3000とは、下記構造(n=1〜10)である。
表1の組成にて、金属粒子85wt%、樹脂8wt%、フラックス7wt%の組成とした他は、実施例と同じ方法で接着フィルムを作製した。
市販の低密度ポリエチレンよりなる樹脂ビーズ(日本ポリエチレン(株)製 ノバテックLL)を140℃で溶融し、押し出し機を用いて厚さ100μmの長尺フィルム状に成形した。
n−オクチルアクリレート、2−ヒドロキシエチルアクリレート、メタクリル酸、重合開始剤としてベンゾイルペルオキシドの200:10:5:2(重量比)混合物を適量のトルエン中に分散し、反応温度および反応時間を調整し、官能基を持つアクリル樹脂の溶液を得た。次にこのアクリル樹脂溶液に、ポリイソシアネートとしてコロネートL(日本ポリウレタン製)を前記アクリル樹脂溶液100重量部に対して2重量部と、追加の溶媒として適量のトルエンを加え、攪拌して粘着剤組成物1を得た。
支持基材上に粘着剤組成物1の乾燥後の厚さが5μmになるように前記粘着剤組成物を塗工し、120℃で3分間乾燥させてダイシングテープを作成した。
Cu:三井金属鉱業製 微粒銅粉
SnBi合金:三井金属鉱業製 微粒半田粉 Sn72Bi28
エポキシ:新日鉄住金化学製 YD−128+YD−013+YP−50+四国化成製 2PHZ の 15:5:10:1混合物
ビスマレイミド(C9):1,6’−ビスマレイミド−(2,2,4−トリメチル)ヘキサン + 日油製パーブチルO の 100:5混合物
ビスマレイミド(C10):1,10−ビスマレイミド−ノルマルデカン + 日油製パーブチルO の 100:5混合物
ビスマレイミド(C36):DMI社製 BMI−3000 + 日油製パーブチルO の 100:5混合物
スルフィド1:フェニルスルフィド Mw=186.3
スルフィド2:チアントレン Mw=216.3
スルフィド2:ビス(4−メタクリロイルチオフェニル)スルフィド Mw=386.6
である。
特に、フラックスとしてアクリロイル基を有するスルフィド化合物を用いた実施例3、さらには、上記アクリロイル基を有するスルフィド化合物にくわえ、熱硬化性樹脂として炭素数30以上の脂肪族アミンに由来する骨格を含むマレイン酸イミド樹脂を用いた実施例4は、極めて優れた性能を有することがわかる。
1a:裏面Auメッキ層
2:半導体チップ
4:金属リードフレーム
4a:Agメッキ層
5:モールド樹脂
6:Alワイヤ
10:ダイシング・ダイボンディングフィルム
11:剥離処理PET
12:ダイシングテープ
12a:支持基材
12b:粘着剤層
13:接着フィルム
20:リングフレーム
21:ダイシングブレード
22:吸着ステージ
30:テープ突き上げリング
31:突き上げピン
32:吸着コレット
Claims (16)
- 前記スルフィド化合物が1分子中に硫黄原子を2つ以上含む化合物である、請求項1記載の導電性組成物。
- 前記スルフィド化合物がビニル基、アクリロイル基、1級アミノ基、2級アミノ基、フェノール性水酸基、チオール基、ヒドロシリル基、ヒドロホウ素基、マレイン酸エステル基、マレイン酸アミド基、マレイン酸イミド基の少なくともいずれかを有する化合物である、請求項1または2記載の導電性組成物。
- 前記スルフィド化合物の数平均分子量が200以上である、請求項1〜3のいずれかに記載の導電性組成物。
- 少なくとも前記一般式(1)で示されるスルフィド化合物、金属粒子、および熱硬化性樹脂を含む、請求項1〜4のいずかに記載の導電性組成物。
- 前記熱硬化性樹脂がイミド基を1分子に2単位以上含むマレイン酸イミド化合物を含むことを特徴とする、請求項5記載の導電性組成物。
- 前記マレイン酸イミド化合物が、C10以上の脂肪族アミンに由来する骨格を含むことを特徴とする、請求項6記載の導電性組成物。
- 前記マレイン酸イミド化合物の数平均分子量が3000以上である、請求項6または7記載の導電性組成物。
- 前記熱硬化性樹脂がエポキシ樹脂である、請求項5記載の導電性組成物。
- 前記金属粒子の少なくとも1部が、Cu、Ag、Au、Ni、Snのいずれかを含むことを特徴とする、請求項1〜9のいずれかに記載の導電性組成物。
- 前記金属粒子が、相互に金属間化合物形成が可能な組み合わせを含む2種以上の金属の混合物であることを特徴とする、請求項1〜10のいずれかに記載の導電性組成物。
- 前記2種以上の金属粒子の少なくとも2種がCu、Ag、Ni、Ti、Al、Sn、Zn、Au、Inから選択されるものであることを特徴とする、請求項11記載の導電性組成物。
- 焼結前はDSC(示差走査熱量測定)により観測される吸熱ピークが100℃〜250℃において少なくとも1つ存在し、かつ、焼結後はそれが観測されなくなることを特徴とする、請求項1〜12のいずれかに記載の導電性組成物。
- 請求項1〜13のいずれかに記載の導電性組成物を用いてなる、導電性接着剤組成物。
- 請求項14記載の導電性接着剤組成物を基材に膜状に成形した、導電性接着フィルム。
- 請求項15記載の導電性接着フィルムと、粘着テープとを貼り合わせてなる、ダイシングダイボンディングフィルム。
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JP2017069559A (ja) * | 2015-09-30 | 2017-04-06 | 日東電工株式会社 | パワー半導体装置の製造方法 |
JP2017069558A (ja) * | 2015-09-30 | 2017-04-06 | 日東電工株式会社 | パワー半導体装置の製造方法 |
JP6005313B1 (ja) | 2016-02-10 | 2016-10-12 | 古河電気工業株式会社 | 導電性接着フィルムおよびこれを用いたダイシング・ダイボンディングフィルム |
JP5972490B1 (ja) | 2016-02-10 | 2016-08-17 | 古河電気工業株式会社 | 導電性接着剤組成物ならびにこれを用いた導電性接着フィルムおよびダイシング・ダイボンディングフィルム |
JP6005312B1 (ja) | 2016-02-10 | 2016-10-12 | 古河電気工業株式会社 | 導電性接着フィルムおよびこれを用いたダイシング・ダイボンディングフィルム |
JP5972489B1 (ja) | 2016-02-10 | 2016-08-17 | 古河電気工業株式会社 | 導電性接着フィルムおよびこれを用いたダイシング・ダイボンディングフィルム |
JP5989928B1 (ja) | 2016-02-10 | 2016-09-07 | 古河電気工業株式会社 | 導電性接着フィルムおよびこれを用いたダイシング・ダイボンディングフィルム |
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