JP6431340B2 - 封止用熱硬化性樹脂シート及び中空パッケージの製造方法 - Google Patents
封止用熱硬化性樹脂シート及び中空パッケージの製造方法 Download PDFInfo
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- JP6431340B2 JP6431340B2 JP2014227124A JP2014227124A JP6431340B2 JP 6431340 B2 JP6431340 B2 JP 6431340B2 JP 2014227124 A JP2014227124 A JP 2014227124A JP 2014227124 A JP2014227124 A JP 2014227124A JP 6431340 B2 JP6431340 B2 JP 6431340B2
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Images
Classifications
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- H01L24/95—Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips
- H01L24/97—Batch processes at chip-level, i.e. with connecting carried out on a plurality of singulated devices, i.e. on diced chips the devices being connected to a common substrate, e.g. interposer, said common substrate being separable into individual assemblies after connecting
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- H01L2924/15311—Connection portion the connection portion being formed only on the surface of the substrate opposite to the die mounting surface being a ball array, e.g. BGA
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- H03H3/08—Apparatus or processes specially adapted for the manufacture of impedance networks, resonating circuits, resonators for the manufacture of electromechanical resonators or networks for the manufacture of resonators or networks using surface acoustic waves
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Description
(熱硬化性樹脂シート11)
熱硬化性樹脂シート11について説明する。
なお、硬化物は、例えば、熱硬化性樹脂シート11を150℃、1時間で加熱して硬化させることにより得られる。
なお、Tgは実施例に記載の方法で測定できる。
なお、線膨張係数は実施例に記載の方法で測定できる。
なお、引張貯蔵弾性率は実施例に記載の方法で測定できる。
一方、熱硬化性樹脂シート11の60℃〜130℃における最低溶融粘度は、好ましくは20000Pa・s以下、より好ましくは15000Pa・s以下である。20000Pa・s以下であると、電子デバイスを熱硬化性樹脂シート11内に容易に埋め込むことが可能となるので、ボイドを低減できる。
なお、最低溶融粘度は実施例に記載の方法で測定できる。
なお、熱硬化性樹脂と熱可塑性樹脂が相溶しているとは、透過型電子顕微鏡(TEM)にて観察される観察像において、熱硬化性樹脂と熱可塑性樹脂の相分離構造が観察されないことをいう。
なお、酸価は、JIS K 0070−1992に規定される中和滴定法で測定できる。
なお、重量平均分子量は、GPC(ゲル・パーミエーション・クロマトグラフィー)により測定し、ポリスチレン換算により算出された値である。
また、ガラス転移温度を求める他の方法として、示差走査熱量計(DSC)によって測定される最大熱吸収ピーク時の温度により、熱可塑性樹脂のガラス転移温度を求める方法もある。具体的には、測定する試料を示差走査熱量計(ティー・エイ・インスツルメント社製の「Q−2000」)を用い、予測される試料のガラス転移温度(予測温度)より約50℃高い温度で10分加熱した後、予測温度より50℃低い温度まで冷却して前処理し、その後、窒素雰囲気下、昇温速度5℃/分にて昇温して吸熱開始点温度を測定し、これをガラス転移温度とする。
なお、平均粒子径は、例えば、母集団から任意に抽出される試料を用い、レーザー回折散乱式粒度分布測定装置を用いて測定することにより導き出すことができる。
熱硬化性樹脂シート11をるつぼに入れ、強熱して熱硬化性樹脂シート11を灰化させる。得られた灰分を純水中に分散させて10分間超音波処理し、レーザー回折散乱式粒度分布測定装置(ベックマンコールター社製、「LS 13 320」;湿式法)を用いて粒度分布(体積基準)を求める。
シリカは通常、比重2.2g/cm3であるので、シリカの含有量(重量%)の好適範囲は例えば以下のとおりである。
すなわち、熱硬化性樹脂シート11中のシリカの含有量は、好ましくは75重量%以上、より好ましくは80重量%以上である。一方、熱硬化性樹脂シート11中のシリカの含有量は、好ましくは95重量%以下、より好ましくは90重量%以下である。
すなわち、熱硬化性樹脂シート11中のアルミナの含有量は、好ましくは85重量%以上、より好ましくは90重量%以上である。一方、熱硬化性樹脂シート11中のアルミナの含有量は、好ましくは97重量%以下、より好ましくは95重量%以下である。
図5に示すように、積層体31は下側加熱板41と上側加熱板42の間に配置されている。積層体31は、デバイス実装体2、デバイス実装体2上に配置された熱硬化性樹脂シート11及び熱硬化性樹脂シート11上に配置されたセパレーター12を備える。
実施形態1では、熱硬化性樹脂シート11は単層構造であるが、変形例1では、熱硬化性樹脂シート11は、複数の熱硬化性樹脂層を積層した多層構造である。変形例1の熱硬化性樹脂シート11について、電子デバイスと接する熱硬化性樹脂層を硬化させることにより得られた硬化層が、ドメイン部及びドメイン部より柔らかいマトリックス部を含む海島構造とマトリックス部中に分散されたフィラーとを含む限り、他の熱硬化性樹脂層は特に限定されない。
実施例1では、平行平板方式で積層体31を加圧するが、変形例2では、ラミネータを用いて積層体31を加圧する。
実施例1では、積層体31を熱プレスするが、変形例3では、デバイス実装体2及びデバイス実装体2上に配置された熱硬化性樹脂シート11を備える積層体を熱プレスする(図示せず)。
エポキシ樹脂:新日鐵化学社製のYSLV−80XY(ビスフェノールF型エポキシ樹脂、エポキン当量:200g/eq.、軟化点:80℃)
フェノール樹脂:群栄化学社製のLVR8210DL(ノボラック型フェノール樹脂、水酸基当量:104g/eq.、軟化点:60℃)
熱可塑性樹脂1:根上工業社製のME−2000M(カルボキシル基含有のアクリル酸エステル共重合体、重量平均分子量:約60万、Tg:−35℃、酸価:20mgKOH/g)
熱可塑性樹脂2:根上工業社製のHME−2006(カルボキシル基含有のアクリル酸エステル共重合体、重量平均分子量:約84万、Tg:−47℃、酸価:32mgKOH/g)
熱可塑性樹脂3:ナガセケムテックス社製のSG−280(カルボキシル基含有のアクリル酸エステル共重合体、重量平均分子量:約90万、Tg:−29℃、酸価:30mgKOH/g)
熱可塑性樹脂4:根上工業社製のNSC−010(カルボキシル基含有のアクリル酸エステル共重合体、重量平均分子量:約93万、Tg:−13℃、酸価:5mgKOH/g)
カーボンブラック:三菱化学社製の#20
フィラー1:電気化学工業社製のFB−5SDC(球状シリカ、平均粒径5μm)
フィラー2:アドマテックス社製のSO−25R(球状シリカ、平均粒径0.5μm)
硬化促進剤:四国化成工業社製の2PHZ−PW(2−フェニル−4,5−ジヒドロキシメチルイミダゾール)
表1に記載の配合比に従い、各成分を溶剤としてのメチルエチルケトンに溶解、分散させ、濃度90重量%のワニスを得た。このワニスを、シリコーン離型処理した厚さが38μmのポリエチレンテレフタレートフィルムからなる離型処理フィルム上に塗布した後、110℃で5分間乾燥させた。これにより、厚さ65μmのシートを得た。このシートを4層積層させて厚さ260μmの熱硬化性樹脂シートを得た。
加熱オーブンを用いて、150℃、1時間で熱硬化性樹脂シートを加熱して硬化させることにより硬化物を得た。
フィラー1、フィラー2及びカーボンブラックを配合しない点以外は、熱硬化性樹脂シートと同様の方法で、試験用樹脂シートを作製した。加熱オーブンを用いて、150℃、1時間で試験用樹脂シートを加熱して硬化させることにより試験片を得た。
なお、試験片を作成した理由は、海島構造を観察するためである。硬化物を観察しても海島構造を確認できるが、試験片を観察することで海島構造を容易に確認できる。
熱硬化性樹脂シート、硬化物、試験片について、以下の評価を行った。結果を表1に示す。
熱硬化性樹脂シートの切断面をTEMで観察することにより、相分離の有無を確認した。
熱硬化性樹脂シートについて、動的粘弾性測定装置(TAインスツルメント社製、ARES)を用いて、ギャップ1mm、パラレルプレート直径25mm、測定周波数0.1Hz、ストレイン(歪み)0.1%、測定温度範囲60℃〜130℃、昇温速度10℃/minの測定条件で測定して得られた粘度の最低値を最低粘度とした。
硬化物から、長さ40mm、幅10mm、厚さ200μmの短冊状の試験片をカッターナイフで切り出した。試験片について、固体粘弾性測定装置(RSAIII、レオメトリックサイエンティフィック(株)製)を用いて、−50℃〜300℃における貯蔵弾性率及び損失弾性率を測定した。測定条件は、周波数1Hz、昇温速度10℃/minとした。さらに、tanδ(G’’(損失弾性率)/G’(貯蔵弾性率))の値を算出することによりTgを得た。
硬化物から、長さ15mm、幅5mm、厚さ200μmの測定試料を切り出した。測定試料を熱機械分析装置(リガク社製のTMA8310)のフィルム引張測定用治具にセットした後、−50℃〜300℃の温度域で、引張荷重2g、昇温速度5℃/分の条件下におき、50℃〜70℃での膨張率からCTE1を算出した。
試験片の切断面をTEMで観察することにより、相分離の有無を確認した。(図10及び図11参照)。
試験片の切断面をAFMで観察することにより、海相及び島相について、熱硬化性樹脂及び熱可塑性樹脂のうちどちらが主成分であるのかを確認した。
硬化物の切断面をTEMで観察した。観察像から、島相の最大粒径を求めた。
アルミニウム櫛形電極が形成された以下の仕様のSAWチップを下記ボンディング条件にてセラミック基板に実装して、セラミック基板及びセラミック基板に実装されたSAWチップを備えるSAWチップ実装基板を作製した。SAWチップとセラミック基板との間のギャップ幅は、20μmであった。
チップサイズ:1.2mm角(厚さ150μm)
バンプ材質:Au(高さ20μm)
バンプ数:6バンプ
チップ数:100個(10個×10個)
装置:パナソニック電工(株)製
ボンディング条件:200℃、3N、1sec、超音波出力2W
温度:60℃
加圧力:4MPa
真空度:1.6kPa
プレス時間:1分
エポキシ樹脂:新日鐵化学(株)製のYSLV−80XY(ビスフェノールF型エポキシ樹脂、エポキン当量200g/eq.、軟化点80℃)
フェノール樹脂:群栄化学製のLVR8210DL(ノボラック型フェノール樹脂、水酸基当量104g/eq.、軟化点60℃)
熱可塑性樹脂:カルボキシル基含有のアクリル酸エステル共重合体、重量平均分子量:約60万、ガラス転移温度(Tg):−35℃)
フィラー1:電気化学工業製のFB−9454FC(平均粒径19μm)
カーボンブラック:三菱化学社製の#20
硬化促進剤:四国化成工業社製の2PHZ−PW(2−フェニル−4,5−ジヒドロキシメチルイミダゾール)
表2に記載の配合比に従い、各成分を溶剤としてのメチルエチルケトンに溶解、分散させ、濃度90重量%のワニスを得た。このワニスを、シリコーン離型処理した厚さが38μmのポリエチレンテレフタレートフィルムからなる離型処理フィルム上に塗布した後、110℃で5分間乾燥させた。これにより、厚さ65μmのシートを得た。このシートを4層積層させて厚さ260μmの熱硬化性樹脂シートを得た。
加熱オーブンを用いて、150℃、1時間で熱硬化性樹脂シートを加熱して硬化させることにより硬化物を得た。
熱硬化性樹脂シート、硬化物について、各種評価を行った。結果を表2に示す。
エポキシ樹脂:新日鐵化学(株)製のYSLV−80XY(ビスフェノールF型エポキシ樹脂、エポキン当量200g/eq.、軟化点80℃)
フェノール樹脂:群栄化学製のLVR8210DL(ノボラック型フェノール樹脂、水酸基当量104g/eq.、軟化点60℃)
熱可塑性樹脂:カルボキシル基含有のアクリル酸エステル共重合体、重量平均分子量:約60万、ガラス転移温度(Tg):−35℃)
フィラー1:電気化学工業社製のFB−7SDC(平均粒径6μm)
フィラー2:アドマテックス社製のSO−25R(平均粒径0.5μm)
カーボンブラック:三菱化学社製の#20
硬化促進剤:四国化成工業社製の2PHZ−PW(2−フェニル−4,5−ジヒドロキシメチルイミダゾール)
表3に記載の配合比に従い、各成分を溶剤としてのメチルエチルケトンに溶解、分散させ、濃度90重量%のワニスを得た。このワニスを、シリコーン離型処理した厚さが38μmのポリエチレンテレフタレートフィルムからなる離型処理フィルム上に塗布した後、110℃で5分間乾燥させた。これにより、厚さ65μmのシートを得た。このシートを4層積層させて厚さ260μmの熱硬化性樹脂シートを得た。
加熱オーブンを用いて、150℃、1時間で熱硬化性樹脂シートを加熱して硬化させることにより硬化物を得た。
熱硬化性樹脂シート、硬化物について、各種評価を行った。結果を表3に示す。
エポキシ樹脂:新日鐵化学(株)製のYSLV−80XY(ビスフェノールF型エポキシ樹脂、エポキン当量200g/eq.、軟化点80℃)
フェノール樹脂:群栄化学製のLVR8210DL(ノボラック型フェノール樹脂、水酸基当量104g/eq.、軟化点60℃)
熱可塑性樹脂:カルボキシル基含有のアクリル酸エステル共重合体、重量平均分子量:約60万、ガラス転移温度(Tg):−35℃)
フィラー1:球状溶融シリカ(平均粒径50μm)
カーボンブラック:三菱化学社製の#20
硬化促進剤:四国化成工業社製の2PHZ−PW(2−フェニル−4,5−ジヒドロキシメチルイミダゾール)
表4に記載の配合比に従い、各成分を溶剤としてのメチルエチルケトンに溶解、分散させ、濃度90重量%のワニスを得た。このワニスを、シリコーン離型処理した厚さが38μmのポリエチレンテレフタレートフィルムからなる離型処理フィルム上に塗布した後、110℃で5分間乾燥させた。これにより、厚さ65μmのシートを得た。このシートを4層積層させて厚さ260μmの熱硬化性樹脂シートを得た。
加熱オーブンを用いて、150℃、1時間で熱硬化性樹脂シートを加熱して硬化させることにより硬化物を得た。
熱硬化性樹脂シート、硬化物について、各種評価を行った。結果を表4に示す。
11 熱硬化性樹脂シート
12 セパレーター
22 基板
23 SAWチップ
24 突起電極
25 中空部
26 硬化樹脂
31 積層体
32 封止体
33 硬化体
34 中空パッケージ
41 下側加熱板
42 上側加熱板
Claims (6)
- 中空パッケージを製造するために使用する封止用熱硬化性樹脂シートであって、
前記封止用熱硬化性樹脂シートの硬化物が、
第1の樹脂成分を主成分として含むマトリックス部及び第2の樹脂成分を主成分として含むドメイン部を含む海島構造を備え、
前記マトリックス部が前記ドメイン部よりも柔らかいことを特徴とする封止用熱硬化性樹脂シート。 - 前記硬化物が前記マトリックス部中に分散されたフィラーをさらに含むことを特徴とする請求項1に記載の封止用熱硬化性樹脂シート。
- 熱可塑性樹脂及び熱硬化性樹脂を含み、
前記第1の樹脂成分は、前記熱可塑性樹脂であり、
前記第2の樹脂成分は、前記熱硬化性樹脂であることを特徴とする請求項1又は2に記載の封止用熱硬化性樹脂シート。 - 前記ドメイン部の最大粒径が0.01μm〜5μmであることを特徴とする請求項1〜3のいずれかに記載の封止用熱硬化性樹脂シート。
- 熱可塑性樹脂及び熱硬化性樹脂を含み、
前記熱可塑性樹脂の酸価が1mgKOH/g〜100mgKOH/gであることを特徴とする請求項1〜4のいずれかに記載の封止用熱硬化性樹脂シート。 - 被着体及び前記被着体に実装された電子デバイスを備えるデバイス実装体、並びに前記デバイス実装体上に配置された封止用熱硬化性樹脂シートを備える積層体を加圧して、前記被着体、前記被着体に実装された前記電子デバイス及び前記電子デバイスを覆う前記封止用熱硬化性樹脂シートを備える封止体を形成する工程を含み、
前記封止用熱硬化性樹脂シートの硬化物が、
第1の樹脂成分を主成分として含むマトリックス部及び第2の樹脂成分を主成分として含むドメイン部を含む海島構造を備え、
前記マトリックス部が前記ドメイン部よりも柔らかい中空パッケージの製造方法。
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