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JP4539118B2 - Epoxy resin composition and semiconductor device - Google Patents

Epoxy resin composition and semiconductor device Download PDF

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JP4539118B2
JP4539118B2 JP2004052744A JP2004052744A JP4539118B2 JP 4539118 B2 JP4539118 B2 JP 4539118B2 JP 2004052744 A JP2004052744 A JP 2004052744A JP 2004052744 A JP2004052744 A JP 2004052744A JP 4539118 B2 JP4539118 B2 JP 4539118B2
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epoxy resin
resin composition
silicone oil
semiconductor
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敦准 西川
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Sumitomo Bakelite Co Ltd
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Description

本発明は、半導体封止用エポキシ樹脂組成物、及びこれを用いた半導体装置に関するものである。   The present invention relates to an epoxy resin composition for semiconductor encapsulation and a semiconductor device using the same.

IC、LSI等の半導体素子の封止方法として、エポキシ樹脂組成物のトランスファー成形が低コスト、大量生産に適しており、採用されて久しく、信頼性の点でもエポキシ樹脂や硬化剤であるフェノール樹脂の改良により特性の向上が図られてきた。しかし、近年の電子機器の小型化、軽量化、高性能化の市場動向において、半導体の高集積化も年々進み、また半導体装置の表面実装化が促進されるなかで、半導体封止用エポキシ樹脂組成物への要求は益々厳しいものとなってきている。このため、従来からのエポキシ樹脂組成物では解決出来ない問題点も出てきている。
その最大の問題点は、表面実装の採用により半導体装置が半田浸漬或いは半田リフロー工程で急激に200℃以上の高温にさらされ、吸湿した水分が爆発的に気化する際の応力により、半導体装置内、特に半導体素子、リードフレーム、インナーリード上の金メッキや銀メッキ等の各種メッキされた各接合部分とエポキシ樹脂組成物の硬化物の界面で剥離が生じたりして、信頼性が著しく低下する現象である。
As a sealing method for semiconductor elements such as IC and LSI, transfer molding of epoxy resin composition is suitable for mass production at low cost and has been adopted for a long time, and phenol resin that is epoxy resin and curing agent also from the viewpoint of reliability Improvements have been made to improve the characteristics. However, due to the recent trend toward smaller, lighter, and higher performance electronic devices, semiconductors have been increasingly integrated and the surface mounting of semiconductor devices has been promoted. The demand for compositions has become increasingly severe. For this reason, the problem which cannot be solved with the conventional epoxy resin composition has also come out.
The biggest problem is that by adopting surface mounting, the semiconductor device is suddenly exposed to a high temperature of 200 ° C. or higher in the solder dipping or solder reflow process, and the moisture when moisture absorbed explosively evaporates. In particular, a phenomenon in which reliability is remarkably reduced due to peeling at the interface between various plated joints such as gold plating and silver plating on semiconductor elements, lead frames, and inner leads and the cured product of the epoxy resin composition. It is.

半田処理による信頼性低下を改善するために、エポキシ樹脂組成物中の無機質充填材の充填量を増加させることで低吸湿化、高強度化、低熱膨張化を達成し耐半田性を向上させ、低溶融粘度の樹脂を使用して、成形時に低粘度で高流動性を維持させる手法がある(例えば、特許文献1参照。)。この手法を用いることにより耐半田性がかなり改良されるが、無機充填材の充填割合の増加と共に、流動性が犠牲になり、エポキシ樹脂組成物がパッケージ内に十分に充填されず、空隙が生じやすくなる欠点があった。こうした欠点を改善するため、シリコーンオイルを添加して流動性と耐半田性の両立を図る手法(例えば、特許文献2参照。)や、メッキ部分とエポキシ樹脂組成物の界面での剥離を防止する為、アミノシランやメルカプトシラン等の各種カップリング剤を添加して流動性と耐半田性の両立を図る手法も提案されている(例えば、特許文献3参照。)が、これらの方法でも十分に良好な流動性、充填性と耐半田性を兼ね備えた半導体封止用エポキシ樹脂組成物は得られるには至らなかった。   In order to improve reliability degradation due to solder processing, increase the amount of inorganic filler in the epoxy resin composition to achieve low moisture absorption, high strength, low thermal expansion, improve solder resistance, There is a technique of using a low melt viscosity resin to maintain a high fluidity at a low viscosity during molding (see, for example, Patent Document 1). Although solder resistance is considerably improved by using this method, as the filling rate of the inorganic filler increases, fluidity is sacrificed, and the epoxy resin composition is not sufficiently filled in the package, resulting in voids. There was a drawback that made it easier. In order to remedy these drawbacks, a technique of adding silicone oil to achieve both fluidity and solder resistance (see, for example, Patent Document 2) and preventing peeling at the interface between the plated portion and the epoxy resin composition are prevented. For this reason, there has also been proposed a method for achieving compatibility between fluidity and solder resistance by adding various coupling agents such as aminosilane and mercaptosilane (see, for example, Patent Document 3), but these methods are sufficiently satisfactory. An epoxy resin composition for semiconductor encapsulation that has both excellent fluidity, filling properties and solder resistance has not been obtained.

特開昭64−65116号公報(2〜7頁)JP-A-64-65116 (pages 2-7) 特開平6−228275号公報(2〜8頁)JP-A-6-228275 (pages 2 to 8) 特開平9−255852号公報(2〜7頁)Japanese Patent Laid-Open No. 9-255852 (pages 2 to 7)

本発明は、流動性、充填性、耐半田性に優れた半導体封止用エポキシ樹脂組成物、及びこれを用いた半導体装置を提供するものである。   The present invention provides an epoxy resin composition for semiconductor encapsulation excellent in fluidity, fillability, and solder resistance, and a semiconductor device using the same.

本発明は、
[1] (A)エポキシ樹脂、(B)フェノール樹脂、(C)硬化促進剤、(D)無機充填材、(E)一般式(1)で表されるシランカップリング剤、及び(F)一般式(2)で表されるシリコーンオイルを必須成分とすることを特徴とする半導体封止用エポキシ樹脂組成物、
The present invention
[1] (A) epoxy resin, (B) phenol resin, (C) curing accelerator, (D) inorganic filler, (E) silane coupling agent represented by general formula (1), and (F) An epoxy resin composition for encapsulating a semiconductor, characterized in that the silicone oil represented by the general formula (2) is an essential component,

Figure 0004539118
Figure 0004539118

Figure 0004539118
Figure 0004539118

[2] 第[1]に記載の半導体封止用エポキシ樹脂組成物を用いて半導体素子を封止してなることを特徴とする半導体装置、
である。
[2] A semiconductor device comprising a semiconductor element sealed using the epoxy resin composition for semiconductor sealing according to [1],
It is.

本発明に従うと、半導体素子等の封止成形時において良好な流動性、充填性を有し、かつ無鉛半田に対応する高温の半田処理によってもクラックが発生しない良好な耐半田性を有する半導体封止用エポキシ樹脂組成物が得られるものである。   According to the present invention, a semiconductor package having good fluidity and filling properties at the time of sealing molding of a semiconductor element or the like, and having good solder resistance that does not generate cracks even by high-temperature solder processing corresponding to lead-free solder. An epoxy resin composition for stopping is obtained.

本発明は、エポキシ樹脂、フェノール樹脂、硬化促進剤、無機充填材、二級のアミノ基を有するシランカップリング剤、及び側鎖に長鎖のポリエーテルを有さない低分子量のシリコーンオイルを必須成分とすることにより、半導体素子等の封止成形時において良好な流動性、充填性を有し、かつ無鉛半田に対応する高温の半田処理によってもクラックが発生しない良好な耐半田性を有する半導体封止用エポキシ樹脂組成物が得られるものである。
以下、本発明について詳細に説明する。
The present invention requires an epoxy resin, a phenol resin, a curing accelerator, an inorganic filler, a silane coupling agent having a secondary amino group, and a low molecular weight silicone oil having no long-chain polyether in the side chain. By using it as a component, it has good fluidity and filling properties when encapsulating semiconductor elements, etc., and it has good solder resistance so that cracks do not occur even at high-temperature solder processing corresponding to lead-free solder. An epoxy resin composition for sealing is obtained.
Hereinafter, the present invention will be described in detail.

本発明に用いるエポキシ樹脂としては、1分子内にエポキシ基を2個以上有するモノマー、オリゴマー、ポリマー全般を言い、その分子量、分子構造は特に限定するものではないが、例えばビフェニル型エポキシ樹脂、ビスフェノール型エポキシ樹脂、スチルベン型エポキシ樹脂、フェノールノボラック型エポキシ樹脂、クレゾールノボラック型エポキシ樹脂、トリフェノールメタン型エポキシ樹脂、アルキル変性トリフェノールメタン型エポキシ樹脂、トリアジン核含有エポキシ樹脂、ジシクロペンタジエン変性フェノール型エポキシ樹脂、フェノールアラルキル型エポキシ樹脂(フェニレン骨格、ビフェニレン骨格等を有する)等が挙げられ、これらは単独でも混合して用いても差し支えない。   The epoxy resin used in the present invention refers to monomers, oligomers, and polymers in general having two or more epoxy groups in one molecule, and the molecular weight and molecular structure are not particularly limited. For example, biphenyl type epoxy resin, bisphenol Type epoxy resin, stilbene type epoxy resin, phenol novolac type epoxy resin, cresol novolac type epoxy resin, triphenolmethane type epoxy resin, alkyl-modified triphenolmethane type epoxy resin, triazine nucleus-containing epoxy resin, dicyclopentadiene modified phenol type epoxy Examples thereof include resins, phenol aralkyl type epoxy resins (having a phenylene skeleton, a biphenylene skeleton, etc.), and these may be used alone or in combination.

本発明に用いるフェノール樹脂としては、1分子内にフェノール性水酸基を2個以上有するモノマー、オリゴマー、ポリマー全般を言い、その分子量、分子構造を特に限定するものではないが、例えばフェノールノボラック樹脂、クレゾールノボラック樹脂、ジシクロペンタジエン変性フェノール樹脂、テルペン変性フェノール樹脂、トリフェノールメタン型樹脂、フェノールアラルキル樹脂(フェニレン骨格、ビフェニレン骨格等を有する)等が挙げられ、これらは単独でも混合して用いても差し支えない。   The phenol resin used in the present invention includes monomers, oligomers, and polymers in general having two or more phenolic hydroxyl groups in one molecule, and its molecular weight and molecular structure are not particularly limited. For example, phenol novolak resin, cresol Examples thereof include novolak resins, dicyclopentadiene-modified phenol resins, terpene-modified phenol resins, triphenolmethane type resins, phenol aralkyl resins (having a phenylene skeleton, a biphenylene skeleton, etc.), and these may be used alone or in combination. Absent.

エポキシ樹脂とフェノール樹脂の配合量としては、全エポキシ樹脂のエポキシ基数と全フェノール樹脂のフェノール性水酸基数の比が0.8〜1.3であることが好ましく、この範囲を外れると、エポキシ樹脂組成物の硬化性の低下、或いは硬化物のガラス転移温度の低下、耐湿信頼性の低下等が生じる可能性がある。   As the blending amount of the epoxy resin and the phenol resin, the ratio of the number of epoxy groups in the total epoxy resin and the number of phenolic hydroxyl groups in the total phenol resin is preferably 0.8 to 1.3. There is a possibility that the curability of the composition is lowered, the glass transition temperature of the cured product is lowered, and the moisture resistance reliability is lowered.

本発明で用いられる硬化促進剤としては、エポキシ基とフェノール性水酸基の反応を促進するものであれば特に限定しないが、例えば、1,8−ジアザビシクロ(5,4,0)ウンデセン−7等のジアザビシクロアルケン及びその誘導体、トリブチルアミン、ベンジルジメチルアミン等のアミン系化合物、2−メチルイミダゾール等のイミダゾール化合物、トリフェニルホスフィン、メチルジフェニルホスフィン等の有機ホスフィン類、テトラフェニルホスホニウム・テトラフェニルボレート、テトラフェニルホスホニウム・テトラ安息香酸ボレート、テトラフェニルホスホニウム・テトラナフトイックアシッドボレート、テトラフェニルホスホニウム・テトラナフトイルオキシボレート、テトラフェニルホスホニウム・テトラナフチルオキシボレート等のテトラ置換ホスホニウム・テトラ置換ボレート等が挙げられ、これらは1種類を単独で用いても2種類以上を併用してもよい。   The curing accelerator used in the present invention is not particularly limited as long as it accelerates the reaction between an epoxy group and a phenolic hydroxyl group. For example, 1,8-diazabicyclo (5,4,0) undecene-7 is used. Diazabicycloalkene and its derivatives, amine compounds such as tributylamine and benzyldimethylamine, imidazole compounds such as 2-methylimidazole, organic phosphines such as triphenylphosphine and methyldiphenylphosphine, tetraphenylphosphonium tetraphenylborate, Tetraphenylphosphonium ・ tetrabenzoic acid borate, tetraphenylphosphonium ・ tetranaphthoic acid borate, tetraphenylphosphonium ・ tetranaphthoyloxyborate, tetraphenylphosphonium ・ tetranaphthyloxy Tetra-substituted phosphonium tetra-substituted borate borate, and the like. These may be used in combination of two or more be used one kind alone.

本発明に用いる無機充填材としては、一般に半導体封止用エポキシ樹脂組成物に使用されているものを用いることができる。例えば、溶融シリカ、結晶シリカ、タルク、アルミナ、窒化珪素等が挙げられ、最も好適に使用されるものとしては、球状の溶融シリカである。これらの無機充填剤は、単独でも混合して用いても差し支えない。無機充填材の配合量は、特に限定されないが、全エポキシ樹脂組成物中80〜94重量%が好ましい。下限値を下回ると十分な耐半田性が得られない可能性があり、上限値を超えると十分な流動性が得られない可能性がある。   As an inorganic filler used for this invention, what is generally used for the epoxy resin composition for semiconductor sealing can be used. Examples thereof include fused silica, crystalline silica, talc, alumina, silicon nitride and the like, and the most preferably used is spherical fused silica. These inorganic fillers may be used alone or in combination. Although the compounding quantity of an inorganic filler is not specifically limited, 80 to 94 weight% is preferable in all the epoxy resin compositions. If the lower limit is not reached, sufficient solder resistance may not be obtained, and if the upper limit is exceeded, sufficient fluidity may not be obtained.

本発明においては、一般式(1)で表されるシランカップリング剤と、一般式(2)で表されるシリコーンオイルとを、併用することが必須である。一般式(1)で表されるシランカップリング剤及び一般式(2)で表されるシリコーンオイルは、共に単独でも流動性と充填性を向上させる効果があるものの、両者を併用するとその相乗効果により、顕著に流動性と充填性が向上する効果が得られる。一般式(1)で表されるシランカップリング剤と、一般式(2)で表されるシリコーンオイルのどちらか一方だけ配合していても、半導体素子等の封止成形時に十分な流動性、充填が得られず、結果として表面実装における半田処理において十分な耐半田性を示すことができない。   In this invention, it is essential to use together the silane coupling agent represented by General formula (1), and the silicone oil represented by General formula (2). Although the silane coupling agent represented by the general formula (1) and the silicone oil represented by the general formula (2) are both effective in improving fluidity and filling properties, the synergistic effect is obtained when both are used in combination. As a result, the effect of significantly improving fluidity and filling properties can be obtained. Even if only one of the silane coupling agent represented by the general formula (1) and the silicone oil represented by the general formula (2) is blended, sufficient fluidity at the time of sealing molding of a semiconductor element, Filling cannot be obtained, and as a result, sufficient solder resistance cannot be exhibited in the solder processing in surface mounting.

本発明において用いられる一般式(1)で表されるシランカップリング剤としては、例えば、N−フェニルγアミノプロピルトリメトキシシラン、N−フェニルγアミノプロピルトリエトキシシラン、N−フェニルγアミノプロピルメチルジメトキシシラン、N−ブチルγアミノプロピルトリメトキシシラン、N−β(アミノエチル)γアミノプロピルトリメトキシシラン、N−β(アミノエチル)γアミノプロピルメチルジメトキシシラン等が挙げられ、最も好適に使用されるものとしては、N−フェニルγアミノプロピルトリメトキシシラン等である。一般式(1)で表されるシランカップリング剤は1種類を単独で使用しても2種類以上を併用してもよい。また配合量は、特に限定されないが、全エポキシ樹脂組成物中0.01〜1重量%が望ましく、より好ましくは0.05〜0.8重量%である。上記の下限値を下回ると一般式(2)で表されるシリコーンオイルとの相乗効果による期待するような粘度特性および流動特性が得られない可能性があり、上限値を超えると硬化性が低下する可能性がある。   Examples of the silane coupling agent represented by the general formula (1) used in the present invention include N-phenyl γ aminopropyl trimethoxy silane, N-phenyl γ amino propyl triethoxy silane, and N-phenyl γ amino propyl methyl. Dimethoxysilane, N-butylγaminopropyltrimethoxysilane, N-β (aminoethyl) γaminopropyltrimethoxysilane, N-β (aminoethyl) γaminopropylmethyldimethoxysilane, and the like can be mentioned, and these are most preferably used. Examples thereof include N-phenyl γ aminopropyltrimethoxysilane and the like. The silane coupling agent represented by the general formula (1) may be used alone or in combination of two or more. Moreover, although a compounding quantity is not specifically limited, 0.01 to 1 weight% is desirable in all the epoxy resin compositions, More preferably, it is 0.05 to 0.8 weight%. If the lower limit is not reached, the viscosity and flow characteristics may not be obtained as expected due to the synergistic effect with the silicone oil represented by the general formula (2). If the upper limit is exceeded, the curability decreases. there's a possibility that.

本発明において用いられる一般式(2)で表されるシリコーンオイルは、側鎖に炭素数1〜20の炭化水素基を有し、かつシロキサン結合の重合度が3〜10の低分子量のシリコーンオイルであり、好適に使用されるものとしては側鎖に炭素数4〜12の炭化水素基を有し、かつシロキサン結合の重合度が3〜8のシリコーンオイルであり、最も好適に使用されるものとしては、側鎖に炭素数6〜10の炭化水素基を有し、かつシロキサン結合の重合度が3〜5のシリコーンオイルである。従来、無機充填材の表面や樹脂とのなじみを良くするために、シリコーンオイルの側鎖には長鎖のポリエーテルがよく用いられてきたが、これは材料中に水を貯める要因ともなっており、そのため吸水率が大きくなり、耐半田性の悪化の一因となっていた。そこで側鎖の酸素の数を抑えることで親水性を高めず、吸水率の増加を防ぎ、さらに低分子量にすることで、無機充填材や樹脂のなじみをよくすることができるのである。これらのシリコーンオイルは単独で用いても2種以上併用してもよい。これらのシリコーンオイルの配合量は全エポキシ樹脂組成物中0.01〜1重量%が望ましく、より好ましくは0.05〜0.8重量%である。下限値未満だと一般式(1)で表されるシランカップリング剤との相乗効果による期待するような粘度特性および流動特性が得られない可能性があり、上限値を越えるとエポキシ樹脂組成物の硬化が阻害され、また硬化物の物性が劣り、半導体封止樹脂としての性能が悪化する可能性があるので好ましくない。   The silicone oil represented by the general formula (2) used in the present invention has a low molecular weight silicone oil having a hydrocarbon group having 1 to 20 carbon atoms in the side chain and a degree of polymerization of siloxane bonds of 3 to 10. The silicone oil having 4 to 12 carbon atoms in the side chain and having a siloxane bond polymerization degree of 3 to 8 is most preferably used. Is a silicone oil having a hydrocarbon group having 6 to 10 carbon atoms in the side chain and having a polymerization degree of siloxane bond of 3 to 5. In the past, long-chain polyethers were often used for the side chain of silicone oil to improve the compatibility with the surface of inorganic fillers and resins, but this also causes water to be stored in the material. For this reason, the water absorption rate is increased, which is a cause of deterioration of solder resistance. Therefore, by suppressing the number of oxygen in the side chain, the hydrophilicity is not increased, the increase in water absorption is prevented, and further, the familiarity of the inorganic filler and the resin can be improved by lowering the molecular weight. These silicone oils may be used alone or in combination of two or more. The blending amount of these silicone oils is preferably 0.01 to 1% by weight, more preferably 0.05 to 0.8% by weight, based on the total epoxy resin composition. If it is less than the lower limit, there is a possibility that viscosity characteristics and flow characteristics as expected due to a synergistic effect with the silane coupling agent represented by the general formula (1) may not be obtained, and if the upper limit is exceeded, an epoxy resin composition This is not preferable because the curing of the resin is inhibited, the physical properties of the cured product are inferior, and the performance as a semiconductor sealing resin may be deteriorated.

本発明のエポキシ樹脂組成物は、エポキシ樹脂、フェノール樹脂、硬化促進剤、無機充填材、一般式(1)で表されるシランカップリング剤、及び一般式(2)で表されるシリコーンオイルを必須成分とし、更にこれ以外に必要に応じて、一般式(1)で表される以外のアミノシラン、エポキシシラン、メルカプトシラン、アルキルシラン、ウレイドシラン、ビニルシラン等のシランカップリング剤や、チタネートカップリング剤、アルミニウムカップリング剤、アルミニウム/ジルコニウムカップリング剤等のカップリング剤、一般式(2)で表される以外のシリコーンオイル、カーボンブラック等の着色剤、天然ワックス、合成ワックス等の離型剤及び、ゴム等の低応力添加剤、臭素化エポキシ樹脂や三酸化アンチモン、水酸化アルミニウム、水酸化マグネシウム、ほう酸亜鉛、モリブデン酸亜鉛、フォスファゼン等の難燃剤等の添加剤を適宜配合しても差し支えない。   The epoxy resin composition of the present invention comprises an epoxy resin, a phenol resin, a curing accelerator, an inorganic filler, a silane coupling agent represented by the general formula (1), and a silicone oil represented by the general formula (2). In addition to these, as required, silane coupling agents such as amino silane, epoxy silane, mercapto silane, alkyl silane, ureido silane, and vinyl silane other than those represented by the general formula (1), and titanate coupling Agents, aluminum coupling agents, coupling agents such as aluminum / zirconium coupling agents, silicone oils other than those represented by the general formula (2), colorants such as carbon black, release agents such as natural wax and synthetic wax And low stress additives such as rubber, brominated epoxy resin, antimony trioxide, aluminum hydroxide Arm, magnesium hydroxide, zinc borate, zinc molybdate, be suitably blended additives such as flame retardants such as phosphazene no problem.

また、本発明のエポキシ樹脂組成物は、ミキサー等を用いて原料を充分に均一に混合した後、更に熱ロール又はニーダー等で溶融混練し、冷却後粉砕して得られる。
本発明のエポキシ樹脂組成物を用いて、半導体素子等の各種の電子部品を封止し、半導体装置を製造するには、トランスファーモールド、コンプレッションモールド、インジェクションモールド等の従来からの成形方法で硬化成形すればよい。
The epoxy resin composition of the present invention can be obtained by mixing the raw materials sufficiently uniformly using a mixer or the like, then melt-kneading with a hot roll or a kneader, cooling and pulverizing.
The epoxy resin composition of the present invention is used to encapsulate various electronic components such as semiconductor elements, and to manufacture semiconductor devices by conventional molding methods such as transfer molding, compression molding, and injection molding. do it.

以下に本発明の実施例を示すが、本発明はこれらに限定されるものではない。配合割合は重量部とする。
なお、実施例、及び比較例で用いたカップリング剤及びシリコーンオイルについて、以下に示す。
Examples of the present invention are shown below, but the present invention is not limited thereto. The blending ratio is parts by weight.
In addition, it shows below about the coupling agent and silicone oil which were used by the Example and the comparative example.

カップリング剤1:式(3)で示されるカップリング剤(信越化学(株)製、KBM−573)

Figure 0004539118
Coupling agent 1: Coupling agent represented by formula (3) (manufactured by Shin-Etsu Chemical Co., Ltd., KBM-573)
Figure 0004539118

カップリング剤2:式(4)で示されるカップリング剤(信越化学(株)製、X12−806)

Figure 0004539118
Coupling agent 2: Coupling agent represented by formula (4) (Shin-Etsu Chemical Co., Ltd., X12-806)
Figure 0004539118

カップリング剤3:式(5)で示されるカップリング剤(信越化学(株)製、KBM−403)

Figure 0004539118
Coupling agent 3: Coupling agent represented by formula (5) (manufactured by Shin-Etsu Chemical Co., Ltd., KBM-403)
Figure 0004539118

カップリング剤4:式(6)で示されるカップリング剤(信越化学(株)製、KBE−903)

Figure 0004539118
Coupling agent 4: Coupling agent represented by formula (6) (manufactured by Shin-Etsu Chemical Co., Ltd., KBE-903)
Figure 0004539118

シリコーンオイル1:式(7)で示されるシリコーンオイル(日本ユニカー(株)試作品)

Figure 0004539118
Silicone oil 1: Silicone oil represented by formula (7) (Nippon Unicar Co., Ltd. prototype)
Figure 0004539118

シリコーンオイル2:式(8)で示されるシリコーンオイル(日本ユニカー(株)試作品)

Figure 0004539118
Silicone oil 2: Silicone oil represented by formula (8) (Nippon Unicar Co., Ltd. prototype)
Figure 0004539118

シリコーンオイル3:式(9)で示されるシリコーンオイル(日本ユニカー(株)試作品)

Figure 0004539118
Silicone oil 3: Silicone oil represented by formula (9) (Nippon Unicar Co., Ltd. prototype)
Figure 0004539118

シリコーンオイル4:式(10)で示されるシリコーンオイル(日本ユニカー(株)製、FZ−3730)

Figure 0004539118
Silicone oil 4: Silicone oil represented by formula (10) (manufactured by Nippon Unicar Co., Ltd., FZ-3730)
Figure 0004539118

実施例1
エポキシ樹脂1:ビフェニル型エポキシ樹脂(ジャパンエポキシレジン(株)製、YX−4000、エポキシ当量190g/eq、融点105℃、以下、E−1という)
44重量部
フェノール樹脂1:フェノールアラルキル樹脂(三井化学(株)製、XLC−LL、水酸基当量165g/eq、軟化点79℃、以下H−1という) 38重量部
1,8−ジアザビシクロ(5,4,0)ウンデセン−7(以下DBUという)
5重量部
溶融球状シリカ(平均粒径21μm) 900重量部
カップリング剤1 3重量部
シリコーンオイル1 2重量部
カーボンブラック 3重量部
カルナバワックス 5重量部
をミキサーにて混合し、熱ロールを用いて、95℃で8分間混練して冷却後粉砕し、エポキシ樹脂組成物を得た。得られたエポキシ樹脂組成物を、以下の方法で評価した。結果を表1に示す。
Example 1
Epoxy resin 1: biphenyl type epoxy resin (manufactured by Japan Epoxy Resin Co., Ltd., YX-4000, epoxy equivalent 190 g / eq, melting point 105 ° C., hereinafter referred to as E-1)
44 parts by weight Phenol resin 1: Phenol aralkyl resin (manufactured by Mitsui Chemicals, Inc., XLC-LL, hydroxyl group equivalent 165 g / eq, softening point 79 ° C., hereinafter referred to as H-1) 38 parts by weight 1,8-diazabicyclo (5, 4,0) Undecene-7 (hereinafter referred to as DBU)
5 parts by weight Fused spherical silica (average particle size 21 μm) 900 parts by weight Coupling agent 1 3 parts by weight Silicone oil 1 2 parts by weight Carbon black 3 parts by weight Carnauba wax 5 parts by weight are mixed in a mixer and heated rolls are used. The mixture was kneaded at 95 ° C. for 8 minutes, cooled and pulverized to obtain an epoxy resin composition. The obtained epoxy resin composition was evaluated by the following methods. The results are shown in Table 1.

評価方法
スパイラルフロー:EMMI−1−66に準じたスパイラルフロー測定用金型を用いて、金型温度175℃、圧力6.9MPa、硬化時間120秒で測定した。単位はcm。
充填性(ボイド):低圧トランスファー成形機を用いて成形温度175℃、圧力9.3MPa、硬化時間120秒で160pQFPを成形したものを、超音波探傷装置で観察し内部のボイドの評価を行った。○はボイドなし。△は一部にボイドあり。×は全面にボイドあり。
硬化性:キュラストメーター(オリエンテック(株)製、JSRキュラストメーターIVPS型)を用い、175℃、45秒後のトルクを測定した。この値の大きい方が硬化性は良好である。単位はN・m。
吸湿率:低圧トランスファー成形機を用いて、金型温度175℃、注入圧力7.9MPa、硬化時間120秒で、直径50mm、厚さ3mmの円板を成形し、175℃、8時間加熱処理し、85℃、相対湿度85%の環境下で168時間加湿処理し、重量変化を測定して吸湿率を求めた。単位は重量%。
耐半田性:低圧トランスファー成形機を用いて、成形温度175℃、圧力8.3MPa、硬化時間120秒で、80pQFP(Cuフレーム、チップサイズ6.0mm×6.0mm)を成形し、アフターベークとして175℃、8時間加熱処理した後、85℃、相対湿度85%で120時間の加湿処理を行った後、260℃のIRリフロー処理をした。パッケージ内部の剥離とクラックを超音波探傷機で確認した。10個のパッケージ中の不良パッケージ数を示す。
Evaluation method Spiral flow: Using a spiral flow measurement mold according to EMMI-1-66, measurement was performed at a mold temperature of 175 ° C., a pressure of 6.9 MPa, and a curing time of 120 seconds. The unit is cm.
Fillability (Void): 160 pQFP molded with a low pressure transfer molding machine at a molding temperature of 175 ° C., a pressure of 9.3 MPa, and a curing time of 120 seconds was observed with an ultrasonic flaw detector, and the internal voids were evaluated. . ○ is no void. △ has some voids. X indicates voids on the entire surface.
Curability: Torque was measured after 45 seconds at 175 ° C. using a curast meter (Orientec Co., Ltd., JSR curast meter IVPS type). The larger this value, the better the curability. The unit is N · m.
Moisture absorption: Using a low-pressure transfer molding machine, a disk with a mold temperature of 175 ° C., an injection pressure of 7.9 MPa, a curing time of 120 seconds and a diameter of 50 mm and a thickness of 3 mm is molded and heat-treated at 175 ° C. for 8 hours. , 85 ° C. and 85% relative humidity for 168 hours, and the weight change was measured to determine the moisture absorption rate. The unit is% by weight.
Solder resistance: 80 pQFP (Cu frame, chip size 6.0 mm × 6.0 mm) was molded using a low-pressure transfer molding machine at a molding temperature of 175 ° C., a pressure of 8.3 MPa, and a curing time of 120 seconds. After heat treatment at 175 ° C. for 8 hours, a humidification treatment was performed at 85 ° C. and a relative humidity of 85% for 120 hours, followed by an IR reflow treatment at 260 ° C. Peeling and cracks inside the package were confirmed with an ultrasonic flaw detector. The number of defective packages among the 10 packages is shown.

実施例2〜10、比較例1〜9
表1、及び表2の配合に従い、実施例1と同様にしてエポキシ樹脂組成物を得て、実施例1と同様にして評価した。結果を表1、及び表2に示す。
実施例1以外で用いた原材料を以下に示す。
エポキシ樹脂2:ビフェニレン骨格を有するフェノールアラルキル型エポキシ樹脂(日本化薬(株)製、NC3000P、軟化点58℃、エポキシ当量273、以下、E−2という。)
Examples 2-10, Comparative Examples 1-9
According to the composition of Table 1 and Table 2, an epoxy resin composition was obtained in the same manner as in Example 1 and evaluated in the same manner as in Example 1. The results are shown in Tables 1 and 2.
The raw materials used other than Example 1 are shown below.
Epoxy resin 2: phenol aralkyl type epoxy resin having a biphenylene skeleton (manufactured by Nippon Kayaku Co., Ltd., NC3000P, softening point 58 ° C., epoxy equivalent 273, hereinafter referred to as E-2)

フェノール樹脂2:ビフェニレン骨格を有するフェノールアラルキル樹脂(明和化成(株)製、MEH−7851SS、軟化点107℃、水酸基当量204、以下、H−2という。) Phenol resin 2: Phenol aralkyl resin having a biphenylene skeleton (Maywa Kasei Co., Ltd., MEH-7851SS, softening point 107 ° C., hydroxyl equivalent 204, hereinafter referred to as H-2)

Figure 0004539118
Figure 0004539118

Figure 0004539118
Figure 0004539118

本発明に従うと、半導体素子等の封止成形時において良好な流動性、充填性を有し、かつ無鉛半田に対応する高温の半田処理によってもクラックが発生しない良好な耐半田性を有する半導体封止用エポキシ樹脂組成物が得られるので、特に表面実装型の半導体装置の製造用として好適に用いることができる。   According to the present invention, a semiconductor package having good fluidity and filling properties at the time of sealing molding of a semiconductor element or the like, and having good solder resistance that does not generate cracks even by high-temperature solder processing corresponding to lead-free solder. Since the epoxy resin composition for stopping is obtained, it can be suitably used particularly for the production of a surface mount type semiconductor device.

Claims (2)

(A)エポキシ樹脂、(B)フェノール樹脂、(C)硬化促進剤、(D)無機充填材、(E)一般式(1)で表されるシランカップリング剤、及び(F)一般式(2)で表されるシリコーンオイルを必須成分とすることを特徴とする半導体封止用エポキシ樹脂組成物。
Figure 0004539118
Figure 0004539118
(A) epoxy resin, (B) phenol resin, (C) curing accelerator, (D) inorganic filler, (E) silane coupling agent represented by general formula (1), and (F) general formula ( 2) An epoxy resin composition for encapsulating a semiconductor, comprising the silicone oil represented by 2) as an essential component.
Figure 0004539118
Figure 0004539118
請求項1に記載の半導体封止用エポキシ樹脂組成物を用いて半導体素子を封止してなることを特徴とする半導体装置。 A semiconductor device obtained by sealing a semiconductor element using the epoxy resin composition for semiconductor sealing according to claim 1.
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