JP2011521049A - 粘着剤組成物と、粘着シート及びこれを利用した半導体ウェーハ裏面研削方法 - Google Patents
粘着剤組成物と、粘着シート及びこれを利用した半導体ウェーハ裏面研削方法 Download PDFInfo
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- JP2011521049A JP2011521049A JP2011509414A JP2011509414A JP2011521049A JP 2011521049 A JP2011521049 A JP 2011521049A JP 2011509414 A JP2011509414 A JP 2011509414A JP 2011509414 A JP2011509414 A JP 2011509414A JP 2011521049 A JP2011521049 A JP 2011521049A
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Abstract
【解決手段】本発明は、イソボルニル(メタ)アクリレートを含有する単量体混合物の重合体を含む粘着剤組成物と、粘着シート及び半導体ウェーハの裏面研削方法に関する。本発明では、ハードタイプの単量体であり、且つ低い親水性を有するイソボルニル(メタ)アクリレートを使用することによって、優れた耐水性を示すと共に、剥離特性、再剥離性及びウェーハへの濡れ性に優れた粘着剤組成物と、上記を使用して製造された粘着シート及びこれを利用した裏面研削方法を提供することができる。
【選択図】図1
Description
本発明の粘着剤組成物に含まれる重合体は、単量体成分としてイソボルニル(メタ)アクリレートを含み、また、そのガラス転移温度が−50℃から15℃であることが好ましい。重合体のガラス転移温度が−50℃未満なら、剥離速度によって、剥離力が大きく増加し、例えば、ウェーハ加工工程での通常的な剥離速度(約1.0m/min)での剥離力が過度に高くなって、ウェーハに損傷などが発生するおそれがある。また、ガラス転移温度が15℃を超過すれば、半導体ウェーハのような被着体への濡れ性が低下するか、浮き上がり現象が発生するおそれがある。
以下、本発明による実施例及び比較例を通じて本発明をさらに詳しく説明するが、本発明の範囲が下記提示された実施例によって限定されるものではない。
イソボルニルアクリレート(IBOA)5重量部を含み、粘着性重合体のガラス転移温度が−25℃となるように、イソボルニルアクリレート、メチルアクリレート、エチルアクリレート、n−ブチルアクリレート及び2−ヒドロキシエチルアクリレートの単量体混合物(100重量部)を製造した後、重合工程を経て固形分含量が45重量%の粘着性重合体を製造した。次に、粘着性重合体100重量部に対して2重量部のイソシアネート架橋剤を添加した後、厚さ80μmのエチレン−酢酸ビニル共重合体フィルムに塗布及び乾燥して粘着層(厚さ:20μm)を形成することによって、粘着シートを製造した。次に、製造された粘着シートを50℃の温度で2日間熟成し、後述する評価工程に適用した。
イソボルニルアクリレート(IBOA)10重量部を含み、粘着性重合体のガラス転移温度が−9℃となるようにイソボルニルアクリレート、メチルアクリレート、エチルアクリレート、n−ブチルアクリレート及び2−ヒドロキシエチルアクリレートを混合して単量体混合物(100重量部)を製造して使用したことを除いて、実施例1と同一の方法で粘着シートを製造した。
イソボルニルアクリレート(IBOA)20重量部を含み、粘着性重合体のガラス転移温度が−1℃となるようにイソボルニルアクリレート、メチルアクリレート、エチルアクリレート、n−ブチルアクリレート及び2−ヒドロキシエチルアクリレートを混合して単量体混合物(100重量部)を製造して使用したことを除いて、実施例1と同一の方法で粘着シートを製造した。
イソボルニルアクリレート(IBOA)25重量部を含み、粘着性重合体のガラス転移温度が13℃となるようにイソボルニルアクリレート、メチルアクリレート、エチルアクリレート、n−ブチルアクリレート及び2−ヒドロキシエチルアクリレートを混合して単量体混合物(100重量部)を製造して使用したことを除いて、実施例1と同一の方法で粘着シートを製造した。
粘着性重合体のガラス転移温度が−27℃となるようにメチルアクリレート、エチルアクリレート、n−ブチルアクリレート及び2−ヒドロキシエチルアクリレートを混合して製造された単量体混合物(100重量部)を使用したことを除いて、実施例1と同一の方法で粘着シートを製造した。
粘着性重合体のガラス転移温度が−2℃となるようにメチルアクリレート、エチルアクリレート、n−ブチルアクリレート及び2−ヒドロキシエチルアクリレートを混合して製造された単量体混合物(100重量部)を使用したことを除いて、実施例1と同一の方法で粘着シートを製造した。
ウェーハマウンタ(DS Precision Inc.DYWMDS−8')を使用して、8インチのシリコンウェーハに粘着フィルムを付着し、付着されたウェーハの表面を観察し、ラミネート気泡が発生した部分を計数した後、発生した気泡の数が3個以下なら○、4から7個であれば△、8個以上なら×で評価した。
JIS Z 0237に基づいて、粘着シートをシリコンウェーハに2kgのローラーを使用して付着した後、23℃の温度及び55%の相手湿度条件下で1時間保管した後、引張試験機を使用して1.0m/minの剥離速度で剥離力を評価した。この時、試料のサイズは、2.5cm×24cm(横×縦)で切断して使用した。
ウェーハマウンタで8インチのシリコンウェーハに粘着フィルムを付着した後、エキスパンダー(Expander)でフィルムをウェーハ形状に沿って切断した後、ウェーハ裏面研削機(SVG−502MKII8)を使用して、ウェーハの損傷及びクラックの回数を評価した。具体的に、研削を5回実施し、ウェーハ損傷の回数が0回なら○、1回なら△、2回以上なら×で評価した。
浮き上がり現象を測定し、これを根拠にして粘着シートの耐水性を評価した。具体的に、粘着シートを8インチのシリコンウェーハに付着し、エキスパンダー(Expander)でシートをウェーハ形状に沿って切断した後、ウェーハ裏面研削機(SVG−502MKII8)を使用した裏面研削工程後に、ウェーハ表面及び粘着シートの間への水の浸透可否及び浮き上がり現象を下記基準で評価した。
○:浮き上がりまたは剥離現象無し
△:浮き上がりまたは剥離現象が多少ある
×:浮き上がりまたは剥離現象が多量発生
8インチのシリコンウェーハを150μmまで研削した後、常温で24時間保管した後、平坦な面に粘着シートが付着された面が上向となるように配置し、研削されたウェーハを安全に支持しながら粘着シートを剥離した。剥離時にウェーハに発生するクラック及び破損程度を評価し、下記基準によって再剥離性を評価した。
○:ウェーハにクラック及び破損発生無し
△:ウェーハにクラック及び破損が多少発生
×:ウェーハにクラック及び破損が多量発生
20 基材フィルム
Claims (17)
- イソボルニル(メタ)アクリレートを含有する(メタ)アクリル酸エステル系単量体;及び
ヒドロキシ基、カルボキシル基及び窒素含有官能基よりなる群から選択された1つ以上の官能基を含有する架橋性単量体を含む単量体混合物の重合体を含む粘着剤組成物。 - 前記重合体は、ガラス転移温度が−50℃から15℃である、請求項1に記載の粘着剤組成物。
- 前記重合体は、重量平均分子量が5万から70万である、請求項1に記載の粘着剤組成物。
- 前記(メタ)アクリル酸エステル系単量体は、メチル(メタ)アクリレート、エチル(メタ)アクリレート、n−プロピル(メタ)アクリレート、イソプロピル(メタ)アクリレート、n−ブチル(メタ)アクリレート、t−ブチル(メタ)アクリレート、sec−ブチル(メタ)アクリレート、ペンチル(メタ)アクリレート、2−エチルヘキシル(メタ)アクリレート、2−エチルブチル(メタ)アクリレート、n−オクチル(メタ)アクリレート、イソオクチル(メタ)アクリレート、イソノニル(メタ)アクリレート、ラウリル(メタ)アクリレート及びテトラデシル(メタ)アクリレートよりなる群から選択された1つ以上の第2単量体をさらに含む、請求項1に記載の粘着剤組成物。
- 前記(メタ)アクリル酸エステル系単量体は、1重量部から30重量部のイソボルニル(メタ)アクリレート及び60重量部から98.9重量部の第2単量体を含む、請求項4に記載の粘着剤組成物。
- 前記架橋性単量体が、2−ヒドロキシエチル(メタ)アクリレート、2−ヒドロキシプロピル(メタ)アクリレート、4−ヒドロキシブチル(メタ)アクリレート、6−ヒドロキシヘキシル(メタ)アクリレート、8−ヒドロキシオクチル(メタ)アクリレート、2−ヒドロキシエチレングリコール(メタ)アクリレート、2−ヒドロキシプロピレングリコール(メタ)アクリレート、(メタ)アクリル酸、2−(メタ)アクリロイルオキシ酢酸、3−(メタ)アクリロイルオキシプロピオン酸、4−(メタ)アクリロイルオキシ酪酸、アクリル酸二量体、イタコン酸、マレイン酸、マレイン酸無水物、(メタ)アクリルアミド、N−ビニルピロリドン及びN−ビニルカプロラクタムよりなる群から選択された1つ以上である、請求項1に記載の粘着剤組成物。
- 前記単量体混合物は、90重量部から99.9重量部の(メタ)アクリル酸エステル系単量体及び0.1重量部から10重量部の架橋性単量体を含む、請求項1に記載の粘着剤組成物。
- 重合体100重量部に対して0.1重量部から10重量部の架橋剤をさらに含む、請求項1に記載の粘着剤組成物。
- 前記架橋剤が、イソシアネート系化合物、エポキシ系化合物、アジリジン系化合物及び金属キレート系化合物よりなる群から選択された1つ以上である、請求項9に記載の粘着剤組成物。
- 基材フィルム;及び
上記基材フィルムの一面または両面に形成され、請求項1から10のいずれか1項に記載の粘着剤組成物の硬化物を含有する粘着層を含む粘着シート。 - 前記基材フィルムが、ポリエチレンフィルム、エチレン−酢酸ビニル共重合体フィルム、エチレン−アルキル(メタ)アクリレート共重合体フィルム、エチレン−α−オレフィン共重合体フィルム、プロピレン−α−オレフィン共重合体フィルム、ポリオレフィン系フィルム、ポリエステル系フィルム、ポリ塩化ビニルフィルム、ポリエステル系エラストマまたはウレタン系フィルムである、請求項11に記載の粘着シート。
- 前記基材フィルムは、厚さが10μmから500μmである、請求項11に記載の粘着シート。
- 前記基材フィルムは、−10℃から100℃の温度で貯蔵弾性率が1×107Paから1×109Paである、請求項11に記載の粘着シート。
- 前記粘着層は、厚さが0.5μmから50μmである、請求項11に記載の粘着シート。
- 前記粘着層上に形成された剥離フィルムをさらに含む、請求項11に記載の粘着シート。
- 半導体ウェーハに請求項11に記載の粘着シートを付着する第1段階;及び
前記粘着シートが付着された前記半導体ウェーハの裏面を研削する第2段階を含む裏面研削方法。
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- 2009-05-14 KR KR1020090042231A patent/KR101191120B1/ko active IP Right Grant
- 2009-05-14 WO PCT/KR2009/002559 patent/WO2009139584A2/ko active Application Filing
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Also Published As
Publication number | Publication date |
---|---|
US20170290217A1 (en) | 2017-10-05 |
TWI400311B (zh) | 2013-07-01 |
TW201006900A (en) | 2010-02-16 |
EP2277964B1 (en) | 2019-04-17 |
CN102027085B (zh) | 2014-06-11 |
EP2277964A4 (en) | 2016-05-25 |
US20110139347A1 (en) | 2011-06-16 |
KR20090118881A (ko) | 2009-11-18 |
JP2014218672A (ja) | 2014-11-20 |
WO2009139584A2 (ko) | 2009-11-19 |
KR101191120B1 (ko) | 2012-10-15 |
US10844248B2 (en) | 2020-11-24 |
JP6064261B2 (ja) | 2017-01-25 |
WO2009139584A3 (ko) | 2010-01-21 |
JP5867921B2 (ja) | 2016-02-24 |
EP2277964A2 (en) | 2011-01-26 |
CN102027085A (zh) | 2011-04-20 |
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