JPWO2007010902A1 - 半導体用熱可塑性樹脂組成物、これを用いた接着フィルム、リードフレーム、半導体装置および半導体装置の製造方法 - Google Patents
半導体用熱可塑性樹脂組成物、これを用いた接着フィルム、リードフレーム、半導体装置および半導体装置の製造方法 Download PDFInfo
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- JPWO2007010902A1 JPWO2007010902A1 JP2007526017A JP2007526017A JPWO2007010902A1 JP WO2007010902 A1 JPWO2007010902 A1 JP WO2007010902A1 JP 2007526017 A JP2007526017 A JP 2007526017A JP 2007526017 A JP2007526017 A JP 2007526017A JP WO2007010902 A1 JPWO2007010902 A1 JP WO2007010902A1
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- semiconductor
- adhesive film
- lead frame
- adhesive
- thermoplastic resin
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Abstract
Description
本発明の半導体用熱可塑性樹脂組成物は、1,3−ビス(3−アミノフェノキシ)ベンゼン、3−(3’−(3”−アミノフェノキシ)フェニル)アミノ−1−(3’−(3”−アミノフェノキシ)フェノキシ)ベンゼン、および3,3’−ビス(3”−アミノフェノキシ)ジフェニルエーテルを含む芳香族ジアミン混合物(A)を含むアミン成分と酸成分(C)を反応させて得られる熱可塑性樹脂を含むことをその特徴とするものである。
で表されるシロキサンジアミンが挙げられる。
本発明の半導体用接着フィルムは、本発明の半導体用熱可塑性樹脂組成物からなる接着剤層が、支持フィルムの片面または両面に形成されたものである。図1には、支持フィルム1の両面に接着剤層2を形成した場合の接着フィルムの断面図(図1(a))、および支持フィルム1の片面に接着剤層2を形成した場合の接着フィルムの断面図(図1(b))を示す。
本発明の接着フィルム付きリードフレームは、本発明の半導体用接着フィルムをインナーリード、アウターリード、ダイパッド等が形成されたリードフレームに貼付けてなることをその特徴とするものであり、より具体的には、本発明の半導体用接着フィルムを半導体素子とリードフレームの接着に用いる場合には、当該接着フィルムをリードフレームのダイパッド部に、本発明の半導体用接着フィルムをリードフレームの露出面(裏面)保護のために用いる場合には、当該接着フィルムをリードフレームの、樹脂封止されない面に接着したものである。もちろん、これらの場合を同時に適用したものであってもよい。
本発明の半導体装置は、リードフレーム(ダイパッド)と半導体素子を本発明の半導体用接着フィルムの接着剤層により接着してなることをその特徴とするものである。より具体的には、本発明の半導体装置は、例えば、接着剤層が支持フィルムの片面に形成されている本発明の接着フィルムを、打ち抜き金型等を用いて所定の大きさに打ち抜くか、または切り取り、リードフレームもしくは半導体素子に貼り付け、支持フィルムを除去した後、リードフレームと半導体素子の間に接着剤層が挟まれた状態で、150℃〜300℃、0.5〜10MPa、0.1秒〜10分間、これらを加熱加圧して圧着し、その後リードフレームと半導体素子を金線等のワイヤで接合し、エポキシ樹脂等の成形材料でトランスファ成形して封止することにより製造することができる。本発明の半導体用接着フィルムを用いることで、リードフレームとの貼付性が良好で、かつ高容量で高い信頼性(耐パッケージクラック性)を有する半導体装置を作業性、歩留まりよく簡便に製造することができる。なお、接着剤層が支持フィルムの両面に形成されている接着フィルムを用いる場合には、支持フィルムを除去する必要はない。
(熱可塑性樹脂(A−1)の合成)
温度計、窒素導入管、分留塔、攪拌装置を備えた5リットル重合反応器に、窒素雰囲気下、N−メチル−2−ピロリドン(NMP)を3000部仕込んだ。次に、系内に1,3−ビス(3−アミノフェノキシ)ベンゼン461.7部、3−(3’−(3”−アミノフェノキシ)フェニル)アミノ−1−(3’−(3”−アミノフェノキシ)フェノキシ)ベンゼン7.1部、3.3’−ビス(3”−アミノフェノキシ)ジフェニルエーテル1.9部(合計1.61モル)とシロキサンジアミン(信越化学工業株式会社製、商品名LP−7100)171.2部(0.69モル)を投入し、均一に溶解した。これらを攪拌しながら−10℃まで冷却し、この温度を保持しながら、トリメリット酸無水物モノクロライド(TAC)479.3部(2.28モル)を加えた。室温で1時間攪拌させた後、10℃を越えないようにトリエチルアミン275.9部(2.73モル)を加え、室温で3時間反応させてポリアミド酸を合成し、さらに同系内で180℃、5時間反応させることでポリアミドイミドワニスを合成した。このポリアミドイミドワニスをメタノール中に投入し分離を行い、さらに減圧乾燥を行い、精製された熱可塑性樹脂(A−1)を得た。得られた樹脂の分子量は43000であった。
温度計、窒素導入管、分留塔、攪拌装置を備えた5リットル重合反応器に、窒素雰囲気下、N−メチル−2−ピロリドン(NMP)を3000部仕込んだ。次に、系内に1,3−ビス(3−アミノフェノキシ)ベンゼン527.6部、3−(3’−(3”−アミノフェノキシ)フェニル)アミノ−1−(3’−(3”−アミノフェノキシ)フェノキシ)ベンゼン8.1部、3.3’−ビス(3”−アミノフェノキシ)ジフェニルエーテル2.2部(合計1.84モル)とシロキサンジアミン(信越化学工業株式会社製、商品名X−22−161AS)395.6部(0.46モル)を投入し、均一に溶解した。これらを攪拌しながら−10℃まで冷却し、この温度を保持しながら、トリメリット酸無水物モノクロライド(TAC)479.3部(2.28モル)を加えた。室温で1時間攪拌させた後、10℃を越えないようにトリエチルアミン275.9部(2.73モル)を加え、室温で3時間反応させてポリアミド酸を合成し、さらに同系内で180℃、5時間反応させることでポリアミドイミドワニスを合成した。このポリアミドイミドワニスをメタノール中に投入し分離を行い、さらに減圧乾燥を行い、精製された熱可塑性樹脂(A−2)を得た。得られた樹脂の分子量は40000であった。
温度計、窒素導入管、分留塔、攪拌装置を備えた5リットル重合反応器に、窒素雰囲気下、N−メチル−2−ピロリドン(NMP)を3000部仕込んだ。次に、系内に1,3−ビス(3−アミノフェノキシ)ベンゼン494.6部、3−(3’−(3”−アミノフェノキシ)フェニル)アミノ−1−(3’−(3”−アミノフェノキシ)フェノキシ)ベンゼン7.6部、3.3‘−ビス(3”−アミノフェノキシ)ジフェニルエーテル2.0部(合計1.72モル)とシロキサンジアミン(信越化学工業株式会社製、商品名LP−7100)142.6部(0.575モル)を投入し、均一に溶解した。これらを攪拌しながら−10℃まで冷却し、この温度を保持しながら、4,4’−オキシジフタル酸二無水物706.3部(2.3モル)を加え、室温で3時間反応させてポリアミド酸を合成した。さらに、同系内で180℃、5時間反応させることでポリイミドワニスを合成した。このポリイミドワニスをメタノール中に投入し分離を行い、さらに減圧乾燥を行い、精製された熱可塑性樹脂(A−3)を得た。得られた樹脂の分子量は52000であった。
温度計、窒素導入管、分留塔、攪拌装置を備えた5リットル重合反応器に、窒素雰囲気下、N−メチル−2−ピロリドン(NMP)を3000部仕込んだ。次に、系内に1,3−ビス(3−アミノフェノキシ)ベンゼン470.6部(1.61モル)とシロキサンジアミン(信越化学工業株式会社製、商品名LP−7100)171.2部(0.69モル)を投入し、均一に溶解した。これらを攪拌しながら−10℃まで冷却しこの温度を保持しながら、トリメリット酸無水物モノクロライド(TAC)479.3部(2.28モル)を加えた。室温で1時間攪拌させた後、10℃を越えないようにトリエチルアミン275.9部(2.73モル)を加え、室温で3時間反応させてポリアミド酸を合成し、さらに、同系内で180℃、5時間反応させることでポリアミドイミドワニスを合成した。このポリアミドイミドワニスをメタノール中に投入し分離を行い、さらに減圧乾燥を行い、精製された熱可塑性樹脂(A−4)を得た。得られた樹脂の分子量は39000であった。
温度計、窒素導入管、分留塔、攪拌装置を備えた5リットル重合反応器に、窒素雰囲気下、N−メチル−2−ピロリドン(NMP)を3000部仕込んだ。次に、系内に2,2−ビス[4−(4−アミノフェノキシ)フェニル]プロパン519.2部(1.27モル)とシロキサンジアミン(信越化学工業株式会社製、商品名LP−7100)256.7部(1.04モル)を投入し、均一に溶解した。これらを攪拌しながら−10℃まで冷却しこの温度を保持しながら、4,4’−オキシジフタル酸二無水物706.3部(2.3モル)を加え、室温で3時間反応させることでポリアミド酸を合成した。さらに、同系内で180℃、5時間反応させてポリイミドワニスを合成した。このポリイミドワニスをメタノール中に投入し分離を行い、さらに減圧乾燥を行い、精製された熱可塑性樹脂(A−5)を得た。得られた樹脂の分子量は50000であった。
温度計、窒素導入管、分留塔、攪拌装置を備えた5リットル重合反応器に、窒素雰囲気下、N−メチル−2−ピロリドン(NMP)を3000部仕込んだ。次に、系内に1,3−ビス(3−アミノフェノキシ)ベンゼン409.3部、3−(3’−(3”−アミノフェノキシ)フェニル)アミノ−1−(3’−(3”−アミノフェノキシ)フェノキシ)ベンゼン6.3部、3,3’−ビス(3”−アミノフェノキシ)ジフェニルエーテル1.7部(合計1.43モル)とドデカンジアミン(和光純薬株式会社製)154.3部(0.77モル)を投入し、均一に溶解した。これらを攪拌しながら−10℃まで冷却しこの温度を保持しながら、トリメリット酸無水物モノクロライド(TAC)463.1部(2.20モル)を加えた。室温(25℃)で1時間攪拌させた後、10℃を越えないようにトリエチルアミン266.6部(2.64モル)を加え、室温(25℃)で3時間反応させてポリアミド酸を合成した。さらにこの合成ワニスを用い、同系内で180℃、5時間反応させてポリアミドイミドワニスを合成した。このポリアミドイミドワニスをメタノール中に投入し分離を行い、さらに減圧乾燥を行い、精製された熱可塑性樹脂(A−6)を得た。得られた樹脂の分子量は38000であった。
(実施例1)
上記で得た熱可塑性樹脂(A−1)とN−メチル−2−ピロリドン(NMP)を均一になるまで溶解し、カップリング剤(信越シリコーン(株)製、商品名:KBM403)を熱可塑性樹脂(A−1)100部に対して3部添加し、樹脂組成物ワニスを作製した。このワニスの250℃、2時間加熱後の不揮発分は40%であった。ついでこのワニスを、化学処理したポリイミドフィルム(宇部興産(株)製、商品名:ユーピレックスSPA)の両面に塗布した後、90℃で5分、更に250℃で10分間乾燥して厚さ25μmの接着剤層を形成し、3層構造の半導体用接着フィルムを得た。
熱可塑性樹脂(A−1)の代わりに熱可塑性樹脂(A−2)を用いた以外は、実施例1と同様にして3層構造の半導体用接着フィルムを得た。
熱可塑性樹脂(A−1)の代わりに熱可塑性樹脂(A−3)を用い、また、カップリング剤として、KBM573(信越シリコーン(株)製、商品名)を用いた以外は、実施例1と同様にして3層構造の半導体用接着フィルムを得た。
熱可塑性樹脂(A−1)に代わりに熱可塑性樹脂(A−6)を用いた以外は、実施例1と同様にして3層構造の半導体用接着フィルムを得た。
熱可塑性樹脂(A−1)の代わりに熱可塑性樹脂(A−4)を用いた以外は、実施例1と同様にして3層構造の半導体用接着フィルムを得た。
熱可塑性樹脂(A−1)の代わりに熱可塑性樹脂(A−5)を用い、また、カップリング剤として、KBM573(信越シリコーン(株)製、商品名)を用いた以外は、実施例1と同様にして3層構造の半導体用接着フィルムを得た。
上記実施例1〜4および比較例1〜2で得た各半導体用接着フィルムについて、リードフレームとの貼付性(ボイド発生の有無)、半導体素子との接着力、ワイヤボンディング性、耐リフロー性を以下のとおり評価した。結果を表1に示す。
各半導体用接着フィルムを2×3mmに打ち抜き、圧着プレスを用いて、圧着温度200または280℃で、圧力3.0MPa、圧着時間0.5secの条件で鉄−ニッケル合金製のリードフレームと各半導体用接着フィルムの接着剤層を接着した。リードフレームに貼付けた半導体用接着フィルムを実体顕微鏡で観察し、ボイドの有無を評価した。
上記リードフレームとの貼付性評価で作製した各接着フィルム付きリードフレームの、リードフレームと接着している接着剤層と反対面の接着剤層面に、圧着温度200℃または280℃で、圧力0.5MPa、圧着時間0.5secの条件で半導体素子を接着した。プッシュプルゲージを用いて、半導体素子との接着力を評価した。
各半導体用接着フィルムを打ち抜き金型を用いて短冊上に打ち抜き、これを、厚さ0.20mmの鉄−ニッケル合金製リードフレーム上に、0.2mm間隔、0.2mm幅のインナーリードが当たるように乗せて、圧着温度230℃、圧力3.0MPa、圧着時間3.0secの条件でリードフレームと半導体用接着フィルムを接着した。ついで、この接着フィルム付きリードフレームの接着剤層面に圧着温度200℃、圧力3.0MPa、圧着時間3.0secの条件で半導体素子を接着した。ついで、ワイヤボンディングにより接着フィルム付きリードフレームのインナーリードと半導体素子とを160℃の条件で金線ワイヤで接続し、当該ワイヤの接着具合を評価した。
上記ワイヤボンディング性評価でワイヤボンディングされた接着フィルム付きリードフレームと半導体素子を、ビフェニル系エポキシ樹脂成形材料(日立化成工業(株)製、商品名:CEL−9200)でトランスファ成形により封止し、図5に示すような半導体装置(パッケージ)を得た。この半導体装置を85℃、85%RH、48時間吸湿処理した後、245℃の半田リフロー炉を通し、パッケージクラックの有無を評価した。なお、図5において、3は接着フィルム、4は半導体素子、5はリードフレーム、6は封止材、7はボンディングワイヤ、8はバスバーである。
温度計、撹拌機、窒素導入管及び分留塔をとりつけた1リットルの4つ口フラスコに窒素雰囲気下、1,3−ビス(3−アミノフェノキシ)ベンゼン77.4g、3−(3’−(3”−アミノフェノキシ)フェニル)アミノ−1−(3’−(3”−アミノフェノキシ)フェノキシ)ベンゼン1.2g、3,3’−ビス(3”−アミノフェノキシ)ジフェニルエーテル0.32g(合計0.270モル)を入れ、N−メチル−2−ピロリドン483gに溶解した。さらに、この溶液を攪拌しながら0℃に冷却し、無水トリメリット酸クロライド57.4g(0.273モル)を添加した。無水トリメリット酸クロライドが溶解したら、トリエチルアミン32.7gを添加した。室温で2時間撹拌を続けた後、180℃に昇温して5時間反応させてイミド化を完結させた。得られた反応液をメタノール中に投入して重合体を単離した。これを乾燥した後、N−メチル−2−ピロリドンに溶解しメタノール中に投入して再度重合体を単離した。その後、減圧乾燥して精製されたポリエーテルアミドイミド粉末を得た。得られたポリエーテルアミドイミド粉末120g及びシランカップリング剤(信越化学工業株式会社製、商品名:SH6040)3.6gをN−メチル−2−ピロリドン360gに溶解し、芳香族ポリエーテルアミドイミド接着剤ワニスを得た。
Claims (21)
- 1,3−ビス(3−アミノフェノキシ)ベンゼン、3−(3’−(3”−アミノフェノキシ)フェニル)アミノ−1−(3’−(3”−アミノフェノキシ)フェノキシ)ベンゼン、および3,3’−ビス(3”−アミノフェノキシ)ジフェニルエーテルを含む芳香族ジアミン混合物(A)を含むアミン成分と、酸成分(C)とを反応させて得られる熱可塑性樹脂を含む、半導体用熱可塑性樹脂組成物。
- 前記芳香族ジアミン混合物(A)が、該混合物(A)100重量%に対して、前記3−(3’−(3”−アミノフェノキシ)フェニル)アミノ−1−(3’−(3”−アミノフェノキシ)フェノキシ)ベンゼンを0.01〜50重量%、前記3,3’−ビス(3”−アミノフェノキシ)ジフェニルエーテルを10重量%未満含む、請求項1に記載の半導体用熱可塑性樹脂組成物。
- 前記アミン成分が、さらにシロキサンジアミン(B)を含む、請求項1に記載の半導体用熱可塑性樹脂組成物。
- 前記アミン成分が、該アミン成分100mol%に対して、前記シロキサンジアミン(B)を0.01〜80mol%含む、請求項3に記載の半導体用熱可塑性樹脂組成物。
- 前記酸成分(C)が無水トリメリット酸モノクロライドである、請求項1に記載の半導体用熱可塑性樹脂組成物。
- さらにカップリング剤を、前記熱可塑性樹脂100重量部に対して0.1〜50.0重量部含む、請求項1に記載の半導体用熱可塑性樹脂組成物。
- 支持フィルム、および
前記支持フィルムの片面または両面に形成され、請求項1に記載の半導体用熱可塑性樹脂組成物からなる接着剤層、
を有する半導体用接着フィルム。 - 前記接着剤層の水に対する接触角が50〜80度である、請求項7に記載の半導体用接着フィルム。
- 前記接着剤層のガラス転移温度が150〜250℃である、請求項7に記載の半導体用接着フィルム。
- 前記接着剤層が5重量%減少する温度が300℃以上である、請求項7に記載の半導体用接着フィルム。
- 前記支持フィルムの材質が、ポリイミド、ポリアミド、ポリサルフォン、ポリフェニレンサルファイド、ポリエーテルエーテルケトン、ポリアリレート、ポリカーボネート、ポリオレフィン、ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリアミドイミド、ポリエーテルスルホン、ポリエーテルケトンからなる群から選ばれる、請求項7に記載の半導体用接着フィルム。
- 前記支持フィルムの厚さが5〜200μmで、前記接着剤層の厚さが1〜75μmである、請求項7に記載の半導体用接着フィルム。
- 前記支持フィルムの片面に、前記接着剤層が形成されており、その反対面に230℃における弾性率が10MPa以上の接着性を有しない樹脂層が形成されている、請求項7に記載の半導体用接着フィルム。
- 請求項7に記載の半導体用接着フィルムをリードフレームに貼付けてなる接着フィルム付きリードフレーム。
- 請求項7に記載の半導体用接着フィルムを用いてリードフレームと半導体素子を接着してなる半導体装置。
- インナーリード及びダイパッドを有するリードフレーム、
前記リードフレームの一方の面に接着された請求項7に記載の半導体用接着フィルム、
前記リードフレームの他方の面の前記ダイパッド上に接着された半導体素子、
前記半導体素子と前記インナーリードとを接続するワイヤ、並びに
前記リードフレームの他方の面、前記半導体素子及び前記ワイヤを封止する封止材層、
を備える接着フィルム付き半導体装置。 - 前記ダイパッドと前記半導体素子が請求項7に記載の半導体用接着フィルムの接着剤層を介して接着されている請求項16記載の接着フィルム付き半導体装置。
- 請求項16に記載の接着フィルム付き半導体装置から半導体用接着フィルムを剥離して得られる半導体装置。
- インナーリード及びダイパッドを有するリードフレームの一方の面に、請求項7に記載の半導体用接着フィルムを貼り付ける工程、
前記リードフレームの他方の面のダイパッド上に半導体素子を接着する工程、
ワイヤボンディングにより前記半導体素子と前記インナーリードとをワイヤで接続する工程、
前記リードフレームの他方の面、前記半導体素子及び前記ワイヤを封止材で封止する工程、並びに、
前記半導体用接着フィルムを前記リードフレームの一方の面及び前記封止材から剥離する工程、
を有する半導体装置の製造方法。 - 前記リードフレームがダイパッド及びインナーリードを各々有する複数のパターンからなり、前記封止する工程後又は前記半導体用接着フィルムを剥離する工程の後に、該リードフレームを分割することにより、各々1個の半導体素子を有する複数の半導体装置を得る工程を含む請求項19記載の半導体装置の製造方法。
- 前記ダイパッドと半導体素子の接着を、請求項7に記載の半導体用接着フィルムを用いて行う請求項19記載の半導体装置の製造方法。
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