JP2009161588A - 粘接着剤組成物、粘接着シートおよび半導体装置の製造方法 - Google Patents
粘接着剤組成物、粘接着シートおよび半導体装置の製造方法 Download PDFInfo
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- JP2009161588A JP2009161588A JP2007339729A JP2007339729A JP2009161588A JP 2009161588 A JP2009161588 A JP 2009161588A JP 2007339729 A JP2007339729 A JP 2007339729A JP 2007339729 A JP2007339729 A JP 2007339729A JP 2009161588 A JP2009161588 A JP 2009161588A
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- Prior art keywords
- adhesive
- adhesive layer
- adhesive composition
- curing accelerator
- adhesive sheet
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Classifications
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
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- B32B7/04—Interconnection of layers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/68—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the catalysts used
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
- C09J5/06—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving heating of the applied adhesive
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
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- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/683—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
- H01L21/6835—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using temporarily an auxiliary support
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- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/77—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate
- H01L21/78—Manufacture or treatment of devices consisting of a plurality of solid state components or integrated circuits formed in, or on, a common substrate with subsequent division of the substrate into plural individual devices
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- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
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Abstract
【解決手段】エポキシ系熱硬化樹脂(A)と、熱硬化剤(B)と、硬化促進剤(C)とを含む粘接着剤組成物であって、前記硬化促進剤(C)がメチルエチルケトンに可溶であると共に室温で硬化促進剤として不活性であることを特徴とする粘接着剤組成物および該粘接着剤組成物からなる粘接着剤層を有する粘接着シート。
【選択図】なし
Description
ところで近年、半導体装置に対する薄型化への要求は非常に厳しいものとなっている。さらにICチップのみならず粘接着剤層自体も薄くすることが求められている。ICチップを多数積層する半導体装置の構造において、ICチップと基板の間に存在する粘接着剤層の厚みは、無視のできないものであるからである。
しかし、粒子状の分散型熱潜在性硬化剤もしくは硬化促進剤は粘接着剤層中に均一に分散させることが難しく、粒子径が無視できないほど粘接着剤層の厚みが薄くなると安定した塗工面が得られない。さらに得られる硬化物の構造が不均一になりやすく、物性のばらつきの大きいことが問題である。
安定性を有する粘接着剤組成物を得ている。しかしながら、粒子状の熱潜在性硬化剤を用いると、硬化剤の粒子径以下の厚みの粘接着剤層を有する粘接着シートを作成することは物理的に困難であり、近年の半導体装置に対する薄型化への要求に応えることができない。
[1]エポキシ系熱硬化樹脂(A)と、熱硬化剤(B)と、硬化促進剤(C)とを含む粘接着剤組成物であって、前記硬化促進剤(C)がメチルエチルケトンに可溶であると共
に室温で硬化促進剤として不活性であることを特徴とする粘接着剤組成物。
[3]前記イミダゾール化合物を電子供与体とする錯体における電子受容体が、ホウ素原子を含む化合物であることを特徴とする上記[2]に記載の粘接着剤組成物。
[5]上記[1]〜[4]のいずれかに記載の粘接着剤組成物からなる粘接着剤層が、基材上に形成されてなる粘接着シート。
[7]前記粘接着剤層の厚みが10μm以下であることを特徴とする上記[5]または[6]に記載の粘接着シート。
該半導体ウエハをダイシングする工程と、
ダイシングにより得られた半導体チップを、前記粘接着剤層の少なくとも一部を固着残存させて、該粘接着シートの基材から剥離する工程と、
剥離された半導体チップをダイパッド部または別の半導体チップ上に、該半導体チップに固着残存した粘接着剤層を介して熱圧着する工程と
を備えることを特徴とする半導体装置の製造方法。
本発明に係る粘接着剤組成物(以下、単に「粘接着剤組成物」ともいう。)は、エポキシ系熱硬化樹脂(A)と、熱硬化剤(B)と、硬化促進剤(C)とを含有し、硬化促進剤(C)がメチルエチルケトンに可溶であると共に室温で硬化促進剤として不活性であることを特徴としている。
(A)エポキシ系熱硬化樹脂
エポキシ系熱硬化樹脂(A)としては、従来公知の種々のエポキシ樹脂を用いることができる。
クレゾールノボラック樹脂(下記式(1))、ジシクロペンタジエン型エポキシ樹脂(下記式(2))、ビフェニル型エポキシ樹脂もしくはビフェニル化合物(下記式(3)、(4))など、構造単位の分子中に2つ以上の官能基が含まれるエポキシ化合物が挙げられる。
これらは1種単独で、又は2種類以上を組み合わせて用いることができる。
熱硬化剤(B)は、エポキシ系熱硬化樹脂(A)を硬化させるために用いられる。熱硬化剤(B)としては、1分子中にエポキシ基と反応しうる官能基を2個以上有する化合物が挙げられ、その官能基としてはフェノール性水酸基、アルコール性水酸基、アミノ基、カルボキシル基および酸無水物基などが挙げられる。これらのうち好ましいのはフェノール性水酸基、アミノ基および酸無水物基であり、さらに好ましくはフェノール性水酸基およびアミノ基である。
熱硬化剤(B)は、エポキシ系熱硬化樹脂(A)の合計100重量部に対して0.1〜500重量部含まれることが好ましく、1〜200重量部含まれることがより好ましい。熱硬化剤(B)の量が少ないと、硬化不足で粘接着剤層の接着性が得られないことがあり、過剰であると粘接着剤組成物の吸湿率が高まりパッケージの信頼性を低下させることがある。
硬化促進剤(C)は、粘接着剤組成物の硬化速度を調整するために、また粘接着剤組成物を保存してもその接着性が低下しないようにするために用いられる。
本発明の粘接着剤組成物を用いて粘接着シートを製造する際には、粘接着剤組成物を溶剤に希釈して、それを基材上に塗布し、その後溶剤を揮発させることがある。メチルエチルケトンは、粘接着剤組成物の必須成分(前記エポキシ系熱硬化樹脂(A)、熱硬化剤(B)および硬化促進剤(C))をよく溶解させ、粘接着剤組成物を溶解させて基材上に塗布した後は揮発させやすい。
どの溶剤に希釈し、それを基材上に塗布して溶剤を揮発させて粘接着剤層を得る。ここで従来の粒子状の分散型熱潜在性硬化剤もしくは硬化促進剤は溶剤に溶解せず、溶剤を揮発させて得られた粘接着剤層中でその粒子径が10〜数100μm程度である粒子として存在し、エポキシ系熱硬化樹脂との接触面積が小さいため、貯蔵安定性に優れることは[課
題を解決するための手段]でも説明したとおりである。
メチルエチルケトンに可溶であると共に室温で硬化促進剤として不活性な硬化促進剤としては、三フッ化ホウ素2−メチルイミダゾール等が挙げられる。
という欠点を有していない。
(D)アクリル重合体
粘接着シートにおける粘接着剤層の膜強度を向上させるために、アクリル重合体(D)を本発明の粘接着剤組成物に含有させることができる。アクリル重合体(D)の重量平均分子量は1万以上200万以下であることが望ましく、10万以上150万以下であることがより望ましい。なお、本明細書において重量平均分子量の値はすべてGPC法によるポリスチレン換算値である。アクリル重合体(D)の重量平均分子量が低すぎると、粘接着剤組成物からなる粘接着剤層の基材との接着力が高くなり、前述のピックアップ工程でICチップのピックアップ不良がおこることがあり、200万を超えると前述のボンディング工程で基板の凹凸へ粘接着剤層が追従しないことがあり、ボイドなどの発生原因になることがある。
これらは1種単独で、又は2種類以上を組み合わせて用いることができる。
アクリル重合体(D)は、エポキシ系熱硬化樹脂(A)の合計100重量部に対して1〜10000重量部含まれることが好ましく、10〜1000重量部含まれることがより好ましい。
カップリング剤(E)は、粘接着剤組成物の被着体に対する接着性、密着性を向上させるために用いられる。また、カップリング剤(E)を使用することで、粘接着剤組成物を硬化して得られる硬化物の耐熱性を損なうことなく、その耐水性を向上させることができる。カップリング剤(E)としては、上記エポキシ系熱硬化樹脂(A)およびアクリル重合体(D)等が有する官能基と反応する基を有する化合物が好ましく使用される。
このようなカップリング剤としてはγ−グリシドキシプロピルトリメトキシシラン、γ−グリシドキシプロピルメチルジエトキシシラン、β−(3,4−エポキシシクロヘキシル)エチルトリメトキシシラン、γ−(メタクリロプロピル)トリメトキシシラン、γ−アミノプロピルトリメトキシシラン、N−6−(アミノエチル)−γ−アミノプロピルトリメトキシシラン、N−6−(アミノエチル)−γ−アミノプロピルメチルジエトキシシラン、N−フェニル−γ−アミノプロピルトリメトキシシラン、γ−ウレイドプロピルトリエトキシシラン、γ−メルカプトプロピルトリメトキシシラン、γ−メルカプトプロピルメチルジメトキシシラン、ビス(3−トリエトキシシリルプロピル)テトラスルファン、メチルトリメトキシシラン、メチルトリエトキシシラン、ビニルトリメトキシシラン、ビニルトリアセトキシシラン、イミダゾールシラン等が挙げられる。
カップリング剤(E)を使用する場合、粘接着剤組成物中のカップリング剤(E)の含量は、エポキシ系熱硬化樹脂(A)の、アクリル重合体(D)が粘接着剤祖生物中に含まれる場合にはエポキシ系熱硬化樹脂(A)とアクリル重合体(D)との合計100重量部に対して通常0.1〜20重量部、好ましくは0.2〜10重量部、より好ましくは0.3〜5重量部である。0.1重量部未満であると効果が得られない可能性があり、20重量部を超えるとアウトガスの原因となる可能性がある。
粘接着剤組成物の初期接着力および凝集力を調節するために、架橋剤(F)を添加することもできる。架橋剤(F)としては有機多価イソシアナート化合物、有機多価イミン化合物等が挙げられる。
シアナート化合物の三量体、ならびにこれら多価イソシアナート化合物とポリオール化合物とを反応させて得られる末端イソシアナートウレタンプレポリマー等が挙げられる。
架橋剤(F)を使用する場合、粘接着剤組成物中の架橋剤(F)の含量は、アクリル重合体(D)100重量部に対して通常0.01〜10重量部であり、好ましくは0.1〜5重量部であり、より好ましくは0.5〜3重量部である。
本発明の粘接着剤組成物には、エネルギー線重合性化合物(G)が配合されてもよい。エネルギー線重合性化合物(G)をエネルギー線照射によって硬化させることで、粘接着剤層の接着力を低下させることができるため、ICチップをボンディング工程へ移送する際の基材と粘接着剤層との層間剥離を容易に行えるようになる。なお、通常基材と粘接着剤層間よりも粘接着剤層とチップ間のほうが接着力が大きいので、この際にICチップが粘接着剤層から剥離することはない。
このエネルギー線重合性化合物(G)としては、具体的には、トリメチロールプロパントリアクリレート、ペンタエリスリトールトリアクリレート、ペンタエリスリトールテトラアクリレート、ジペンタエリスリトールモノヒドロキシペンタアクリレート、ジペンタエリスリトールヘキサアクリレートあるいは1,4−ブチレングリコールジアクリレート、1,6−ヘキサンジオールジアクリレート、ポリエチレングリコールジアクリレート、オリゴエステルアクリレート、ウレタンアクリレート系オリゴマー、エポキシ変性アクリレート、ポリエーテルアクリレート、イタコン酸オリゴマーなどのアクリレート系化合物が挙げられる。
これらは1種単独で、又は2種類以上を組み合わせて用いることができる。
本発明の粘着剤組成物は、その使用に際して、紫外線等のエネルギー線を照射して、接着力を低下させることがある。この際、該組成物中に光重合開始剤(H)を添加することで、重合硬化時間ならびに光線照射量を少なくすることができる。
ロキシシクロヘキシルフェニルケトン、ベンジルジフェニルサルファイド、テトラメチルチウラムモノサルファイド、アゾビスイソブチロニトリル、ジアセチル、β-クロールア
ンスラキノンなどが挙げられる。
光重合開始剤(H)の配合割合は、理論的には、粘接着剤中に存在する不飽和結合量やその反応性および使用される光重合開始剤の反応性に基づいて決定されるべきであるが、複雑な混合物系においては必ずしも容易ではない。
無機充填材(I)を粘接着剤組成物に配合することにより、熱膨張係数を調整することが可能となり、半導体チップや金属または有機基板に対して硬化後の粘接着剤層の熱膨張係数を最適化することでパッケージの信頼性を向上させることができる。また、粘接着剤層の硬化後の吸湿率を低減させることも可能となる。
本発明においては、これらのなかでも、シリカ粉末、アルミナ粉末の使用が好ましい。
無機充填材(I)の使用量は、粘接着剤組成物全体に対して、通常0〜80重量%の範囲で調整が可能である。
本発明に係る粘接着剤組成物には、上記の成分の他に、必要に応じて各種添加剤が配合されてもよい。
リマーのグラフト成分、ポリマーのブロック成分であってもよい。また、可とう性成分がエポキシ樹脂に予め変性された変性樹脂であってもよい。
上記のような成分からなる粘接着剤組成物は感圧接着性と加熱硬化性とを有し、未硬化状態では各種被着体を一時的に保持する機能を有する。そして熱硬化を経て最終的には耐衝撃性の高い硬化物を与えることができ、しかも剪断強度と剥離強度とのバランスにも優れ、厳しい湿熱環境にさらされても充分な接着物性を保持し得る。
本発明によれば、上記粘接着剤組成物を用いた粘接着シートが提供される。
本発明に係る粘接着シート(以下、単に「粘接着シート」ともいう)は、基材上に、上記粘接着剤組成物からなる粘接着剤層が形成されてなる。粘接着シートは、テープ状、ラベル状などあらゆる形状をとり得る。
粘接着シートの基材としては、たとえばポリエチレンフィルム、ポリプロピレンフィルム、ポリブテンフィルム、ポリブタジエンフィルム、ポリメチルペンテンフィルム、ポリ塩化ビニルフィルム、塩化ビニル共重合体フィルム、フッ素樹脂フィルム、ポリエチレンテレフタレートフィルム、ポリエチレンナフタレートフィルム、ポリブチレンテレフタレートフィルム、ポリウレタンフィルム、エチレン酢酸ビニル共重合体フィルム、アイオノマー樹脂フィルム、エチレン・(メタ)アクリル酸共重合体フィルム、エチレン・(メタ)アクリル酸エステル共重合体フィルム、ポリスチレンフィルム、ポリカーボネートフィルム、ポリイミドフィルム等の透明フィルムが挙げられる。
また、上記の透明フィルムの他、これらを着色した不透明フィルム等を用いることもできる。ただし、本発明の粘接着シートを使用するに際して、基材面側から紫外線等のエネルギー線照射を行う場合は、基材は使用するエネルギー線に対して透明であることが好ましい。
。すなわち、本発明に係る粘接着シートは、粘接着剤層を基材から被着体に転写する工程を含むプロセスに使用される。このため、基材の粘接着剤層に接する面の表面張力は、好ましくは40mN/m以下、さらに好ましくは37mN/m以下、特に好ましくは1〜35mN/mである。このような表面張力が低い基材は、材質を適宜選択して得ることが可能であるし、また基材の表面に剥離剤を塗布して剥離処理を施すことで得ることもできる。
粘接着剤層の厚みは、好ましくは0.01〜150μm、より好ましくは0.1〜50μm、さらに好ましくは0.5〜10μm程度である。これは、近年の半導体チップの薄型化の要求に応えうる厚みである。また、粘接着剤層中における硬化促進剤(C)の最大粒子径は、通常1μm以下、好ましくは0.1μm以下である。
粘接着シートの製造方法
本発明に係る粘接着シートは、上記のような基材と粘接着剤組成物とから製造される。
本発明によれば、上記粘接着シートを用いた半導体装置の製造方法も提供される。
本発明に係る半導体装置の製造方法においては、まず、本発明に係る粘接着シートをダイシング装置上に、リングフレームにより固定し、シリコンウエハの一方の面を粘接着シートの粘接着剤層上に載置し、軽く押圧し、ウエハを固定する。
次いで粘接着剤層を介してICチップをダイパッド部に載置する。ダイパッド部はICチップを載置する前に加熱するか載置直後に加熱される。加熱温度は、通常は80〜200℃、好ましくは100〜180℃であり、加熱時間は、通常は0.1秒〜5分、好ましくは0.5秒〜3分であり、ダイボンド圧力は、通常1kPa〜200MPaである。
「厚み5μmの粘接着剤層の塗工性」
実施例及び比較例の記載のとおりに粘接着剤層の厚みが5μmの粘接着シートを作成し
た。良好な粘接着シートが得られたものを良好、塗工時に粒子が詰まって塗工できなかったり、得られた粘接着シートの粘接着剤層に塗工スジが発生したり平滑性がないなど、粘接着剤層の面状態が悪いものを不良とした。
(1)半導体チップの製造
まず実施例及び比較例の、粘接着剤層が基材上に形成されてなる粘接着シートを28℃
空気下に遮光した状態で1ヶ月間放置した。その後#2000研磨したシリコンウエハ(150mm径, 厚さ150μm)の研磨面に、放置した粘接着シートの貼付を、テープマウンタ
ー(リンテック社製, Adwill RAD2500)により行い、粘接着シートに貼付したシリコンウエハをウエハダイシング用リングフレームに固定した。
次いで、ダイシング装置(株式会社ディスコ製、DFD651)を使用して、8mm×8mmのチップサイズに上記のシリコンウエハをダイシングした。ダイシングの際の切り込み量については、粘接着シートの基材を20μm切り込むようにした。
基板として銅箔張り積層板(三菱ガス化学株式会社製CCL-HL830)の銅箔(18μm厚
)に回路パターンが形成され、パターン上にソルダーレジスト(太陽インキ製PSR4000 AUS303)を有している基板(株式会社ちの技研製LN001E−001 PCB(Au)A
US303)を用いた。
に基板を封止し(封止装置 アピックヤマダ株式会社製MPC-06M TriAl Press)、175
℃、5時間でモールド樹脂を硬化させた。
に貼付して、ダイシング装置(株式会社ディスコ製、DFD651)を使用して12mm×12mmサイズにダイシングすることで信頼性評価用の半導体パッケージを得た。
得られた半導体パッケージを85℃、60%RH条件下に168時間放置し、吸湿させた
後、最高温度260℃、加熱時間1分間のIRリフロー(リフロー炉:相模理工製WL-15-20DNX型)を3回行った際に、接合部の浮き・剥がれの有無、パッケージクラック発生の有
無を走査型超音波探傷装置(日立建機ファインテック株式会社製Hye-Focus)および断面
観察により評価した。
して、パッケージを25個試験に投入し、剥離が発生しなかった個数を数えた。
まず実施例及び比較例の粘接着シートを28℃空気下に遮光した状態で1ヶ月間放置した。その後#2000研磨したシリコンウエハ(厚さ350μm)の研磨面に、放置した粘接着シートをラミネーター(大成ラミネーター製ラミネーター)を用いて40℃で0.5m/分の速度で、0.1MPaで1回貼り合わせた。その後、粘接着シートの基材を剥離して、そこへ厚さ150μmの銅板(10mm×50mm、トルエンで拭き2時間室温にて乾燥したもの)を、長さ方向50mmのうち約30mmが粘接着剤層に重なるように、上記ラミネーターを用いて80℃、0.5m/分の速度で、0.1MPaで貼り合わせた。その後粘接着剤層を175℃で5時間空気下で加熱硬化し、接着強度の測定を行った。
実施例及び比較例の粘接着シートの、乾燥した粘接着剤層を走査電子顕微鏡(SEM)(日立製作所製、装置名S−4700)を使って観測し、硬化促進剤の最大粒子径を求めた。まず倍率5000〜10000倍で粘接着剤層のSEM写真を撮影した。その写真からスケールで硬化促進剤の粒子径を読み取り、最大のものを最大粒子径とした。
(A)エポキシ系熱硬化樹脂:ビスフェノールAジグリシジルエーテル(ジャパンエポキシレジン株式会社製エピコート828、エポキシ当量189g/eq)
(B)熱硬化剤:ノボラック型フェノール樹脂(昭和高分子株式会社製ショウノールBRG−556、フェノール性水酸基当量104g/eq)
(C)硬化促進剤
(C)−1.三フッ化ホウ素2−メチル1H−イミダゾール(ステラケミファ株式会社製AC4B50、メチルエチルケトン可溶)
(C)−2.2−フェニル−4−メチル−5−ヒドロキシメチルイミダゾール(四国化成工業株式会社製2P4MHZ、メチルエチルケトン不溶)
(C)−3.2−エチル−4−メチルイミダゾール(四国化成工業株式会社製2E4MZ、メチルエチルケトン可溶)
(D)アクリル重合体:メチルアクリレート/2−ヒドロキシエチルアクリレート(85重量%/15重量%)からなるアクリル重合体(重量平均分子量:約40万、Tg:4℃)
(E)シランカップリング剤(三菱化学株式会社製MKCシリケートMSEP2)
(F)架橋剤:芳香族性ポリイソシアナート(日本ポリウレタン工業株式会社製コロネートL)
(G)エネルギー線重合性化合物:2官能性アクリレート(日本化薬株式会社製KAYARADR−684)
(H)光重合開始剤(チバ・スペシャルティ・ケミカルズ株式会社製イルガキュア184
)
また、粘接着シートの基材としては、ポリエチレンフィルム(厚さ100μm、表面張力33mN/m)を用いた。
表1に記載の組成の粘接着剤組成物を使用した。表中、数値は固形分換算の重量部を示す。表1に記載の組成の粘接着剤組成物を固形分濃度40重量%となるようにメチルエチルケトンにて希釈した。その後、粘接着剤組成物をシリコーン処理された剥離フィルム(リンテック株式会社製SP−PET3811(S))上に粘接着剤層が乾燥後5μmの厚みになるように塗布、乾燥(100℃、1分間)した後に基材と貼り合わせて、粘接着剤層を基材上に転写することで粘接着シートを得た。
実施例1〜5で用いた粘接着シートは、長期保管後の表面実装性と接着強度が良好である。一方比較例2,3で用いた粘接着シートは不良な結果となっている。これは比較例2,3で用いた粘接着シートの粘接着剤層に含まれる硬化促進剤が、28℃で硬化促進剤として活性であったためである。
実施例1〜5および比較例2,3では、倍率10000倍のSEM写真において粒子状物質が確認されなかった。比較例1では最大粒子径30μmの粒子状物が確認された。な
お、粘接着剤組成物の原材料中、粘接着剤層において粒子として存在し得る成分は硬化促進剤のみであるから、この粒子状物は硬化促進剤である。硬化促進剤を含まない粘接着剤では粒子状物は見られない。
Claims (8)
- エポキシ系熱硬化樹脂(A)と、熱硬化剤(B)と、硬化促進剤(C)とを含む粘接着剤組成物であって、
前記硬化促進剤(C)がメチルエチルケトンに可溶であると共に室温で硬化促進剤として不活性であることを特徴とする粘接着剤組成物。 - 前記硬化促進剤(C)が、イミダゾール化合物を電子供与体とする錯体であることを特徴とする請求項1に記載の粘接着剤組成物。
- 前記イミダゾール化合物を電子供与体とする錯体における電子受容体が、ホウ素原子を含む化合物であることを特徴とする請求項2に記載の粘接着剤組成物。
- 前記ホウ素原子を含む化合物が、三フッ化ホウ素であることを特徴とする請求項3に記載の粘接着剤組成物。
- 請求項1〜4のいずれかに記載の粘接着剤組成物からなる粘接着剤層が、基材上に形成されてなる粘接着シート。
- 前記粘接着剤層中における前記硬化促進剤(C)の最大粒子径が1μm以下であることを特徴とする請求項5に記載の粘接着シート。
- 前記粘接着剤層の厚みが10μm以下であることを特徴とする請求項5または6に記載の粘接着シート。
- 請求項5〜7のいずれかに記載の粘接着シートの粘接着剤層に半導体ウエハを貼着する工程と、
該半導体ウエハをダイシングする工程と、
ダイシングにより得られた半導体チップを、前記粘接着剤層の少なくとも一部を固着残存させて、該粘接着シートの基材から剥離する工程と、
剥離された半導体チップをダイパッド部または別の半導体チップ上に、該半導体チップに固着残存した粘接着剤層を介して熱圧着する工程と
を備えることを特徴とする半導体装置の製造方法。
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US12/343,124 US8247503B2 (en) | 2007-12-28 | 2008-12-23 | Adhesive composition and adhesive sheet |
KR20080131969A KR101483308B1 (ko) | 2007-12-28 | 2008-12-23 | 점접착제 조성물, 점접착 시트 및 반도체장치의 제조방법 |
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Cited By (6)
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JP2011225840A (ja) * | 2010-03-31 | 2011-11-10 | Lintec Corp | 半導体用接着剤組成物、半導体用接着シートおよび半導体装置の製造方法 |
JP2013181049A (ja) * | 2012-02-29 | 2013-09-12 | Hitachi Chemical Co Ltd | フィルム状接着剤、接着シート及び半導体装置 |
WO2015080188A1 (ja) * | 2013-11-29 | 2015-06-04 | 古河電気工業株式会社 | 半導体加工用粘着テープ |
JP2016191060A (ja) * | 2016-06-09 | 2016-11-10 | 日立化成株式会社 | フィルム状接着剤、接着シート及び半導体装置 |
JP2020070345A (ja) * | 2018-10-31 | 2020-05-07 | 三菱ケミカル株式会社 | 粘接着剤組成物、及びそれを用いてなる粘接着剤、粘接着シート、ならびに積層体 |
WO2020129996A1 (ja) * | 2018-12-19 | 2020-06-25 | 日立化成株式会社 | フィルム状接着剤、接着シート、並びに半導体装置及びその製造方法 |
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KR102126174B1 (ko) * | 2012-11-30 | 2020-06-24 | 린텍 가부시키가이샤 | 보호막 형성용 조성물, 보호막 형성용 시트, 및 경화 보호막을 구비한 칩 |
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CN107429128B (zh) * | 2016-03-09 | 2024-08-02 | 三菱化学株式会社 | 粘接膜及其制造方法 |
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