JP2011184576A - 放射線硬化性粘着剤組成物、それを用いたダイシング用粘着フィルム、及び切断片の製造方法 - Google Patents
放射線硬化性粘着剤組成物、それを用いたダイシング用粘着フィルム、及び切断片の製造方法 Download PDFInfo
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- JP2011184576A JP2011184576A JP2010051613A JP2010051613A JP2011184576A JP 2011184576 A JP2011184576 A JP 2011184576A JP 2010051613 A JP2010051613 A JP 2010051613A JP 2010051613 A JP2010051613 A JP 2010051613A JP 2011184576 A JP2011184576 A JP 2011184576A
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Images
Abstract
【解決手段】共重合モノマー成分として、炭素数2〜8の直鎖または分岐アルキル基含有(メタ)アクリル系モノマー、水酸基含有(メタ)アクリル系モノマー、及び炭素数14〜18の直鎖アルキル基含有(メタ)アクリル系モノマーを少なくとも有するベースポリマーと分子内に放射線反応性炭素−炭素二重結合を有する放射線反応性化合物とを反応させることによって得られる(メタ)アクリル系ポリマー、及び多官能モノマーを含有する放射線硬化性粘着剤組成物、及び該粘着剤を含有する粘着層を有するダイシング用粘着フィルム。
【選択図】なし
Description
前記ベースポリマーは、共重合モノマー成分として、炭素数2〜8の直鎖または分岐アルキル基含有(メタ)アクリル系モノマーと、水酸基含有(メタ)アクリル系モノマーと、炭素数14〜18の直鎖アルキル基含有(メタ)アクリル系モノマーとを少なくとも有し、
前記共重合モノマー成分全量に対して、前記炭素数2〜8の直鎖または分岐アルキル基含有(メタ)アクリル系モノマーの含有量が30〜80質量%、前記水酸基含有(メタ)アクリル系モノマーの含有量が5〜20質量%、前記炭素数14〜18の直鎖アルキル基含有(メタ)アクリル系モノマーの含有量が10〜60質量%であり、
前記放射線反応性化合物の含有量が、前記ベースポリマー100質量部に対して、5〜25質量部である放射線硬化性粘着剤組成物である。
前記粘着剤層は、上記放射線硬化性粘着剤組成物を含有するダイシング用粘着フィルムである。
前記ダイシング用粘着フィルムが貼付された被加工物を切断して切断片に分離し、
前記切断片に貼付されている粘着剤層に放射線を照射して前記粘着剤層の粘着力を低下させ、
前記粘着力を低下させたダイシング用粘着フィルムから前記切断片をピックアップする切断片の製造方法である。特に、被加工物が活性面を有する半導体ウェハである場合に、上記切断片の製造方法が有効である。
共重合モノマー成分として、炭素数2の直鎖アルキル基を含有するアクリル酸エチル(EA)、炭素数8の分岐アルキル基を含有するアクリル酸2−エチルヘキシル(EHA)、水酸基を含有するアクリル酸2−ヒドロキシエチル(HEA)、炭素数14の直鎖のアルキル基を含有するアクリル酸ミリスチル(MA)、炭素数18の直鎖のアルキル基を含有するアクリル酸オクタデシル(STA)、及び炭素数12の直鎖のアルキル基を含有するアクリル酸ドデシル(LA)を準備した。これらの共重合モノマー成分を表1に示す各配合量で混合し、溶液ラジカル重合して各ベースポリマーを合成した。なお、重合にあたっては、GPCにより共重合モノマー成分の反応追跡を行い、共重合モノマー成分が消失した時点で重合を終了した。
多官能モノマーとして、ペンタエリスリトールトリアクリレート(共栄社化学社製,PE3A,3官能)、及びジペンタエリスリトールヘキサアクリレート(日本化薬社製,DPHA,6官能)を準備した。上記のようにして得られた各(メタ)アクリル系ポリマーと、表1に示す各配合量の多官能モノマーと、架橋剤としてポリイソシアネート化合物(日本ポリウレタン社製,コロネートL)0.1部と、光重合開始剤として1−ヒドロキシシクロヘキシルフェニルケトン(チバスペシャリティー・ケミカルズ社製,イルガキュア−184)0.5部とを混合し、各放射線硬化性粘着剤組成物を調製した。
(放射線による硬化前の粘着力)
25mm幅の短冊状に切断したダイシング用粘着フィルムを、鏡面研磨処理直後の5インチのシリコンミラーウェハに、23℃の雰囲気下で貼り合せ、これを室温雰囲気下で30分間静置した測定試料を作製した。この測定試料の粘着力を測定し、以下の基準で硬化前の粘着力を評価した。粘着力の測定条件は、剥離角度180°、剥離速度300mm/分、温度23±3℃とした。
○:粘着力の測定値が、1.0N/10mm以上
△:粘着力の測定値が、0.5N/10mm以上、1.0N/10mm未満
×:粘着力の測定値が、0.5N/10mm未満
放射線による硬化前の粘着力の測定で用いた測定試料と同様の測定試料を作製した。この測定試料のダイシング用粘着フィルムの基材側から紫外線(照射強度:300mJ/cm2)を照射し、照射後の粘着力を上記の放射線による硬化前の粘着力と同様にして測定し、以下の基準で硬化後の粘着力を評価した。
○:粘着力の測定値が、0.05N/10mm未満
△:粘着力の測定値が、0.05N/10mm以上、0.15N/10mm以下
×:粘着力の測定値が、0.15N/10mm超
厚さ100μmの5インチのシリコンミラーウェハを鏡面研磨処理した後、直ちに23℃の雰囲気下で研磨面にダイシング用粘着フィルムを貼り合わせた。この粘着フィルムが貼付されたウェハに洗浄水を供給しながらウェハを3mm×3mmの大きさにフルカットした。
次に、ダイシング用粘着フィルムの基材側から紫外線(照射強度:300mJ/cm2)を照射し、エキスパンドした後、半導体素子を粘着フィルムから剥離して、ピックアップした。任意の半導体素子100個をピックアップしたときに、全ての半導体素子のピックアップが成功した場合を、◎、95〜99個の半導体素子のピックアップが成功した場合を、○、50〜94個の半導体素子のピックアップが成功した場合を、△、それ以外を、×としてピックアップ性を評価した。
2 基材
3 粘着剤層
4 セパレータ
Claims (6)
- ベースポリマーと分子内に放射線反応性炭素−炭素二重結合を有する放射線反応性化合物とを反応させることによって得られる(メタ)アクリル系ポリマー、及び多官能モノマーを含有し、
前記ベースポリマーは、共重合モノマー成分として、炭素数2〜8の直鎖または分岐アルキル基含有(メタ)アクリル系モノマーと、水酸基含有(メタ)アクリル系モノマーと、炭素数14〜18の直鎖アルキル基含有(メタ)アクリル系モノマーとを少なくとも有し、
前記共重合モノマー成分全量に対して、前記炭素数2〜8の直鎖または分岐アルキル基含有(メタ)アクリル系モノマーの含有量が30〜80質量%、前記水酸基含有(メタ)アクリル系モノマーの含有量が5〜20質量%、前記炭素数14〜18の直鎖アルキル基含有(メタ)アクリル系モノマーの含有量が10〜60質量%であり、
前記放射線反応性化合物の含有量が、前記ベースポリマー100質量部に対して、5〜25質量部である放射線硬化性粘着剤組成物。 - 前記多官能モノマーの含有量が、前記ベースポリマー100質量部に対して、5〜30質量部である請求項1に記載の放射線硬化性粘着剤組成物。
- さらに、架橋剤、及び光重合開始剤を含有する請求項1または2に記載の放射線硬化性粘着剤組成物。
- 基材と、前記基材の少なくとも一方の面に粘着剤層とを有するダイシング用粘着フィルムであって、
前記粘着剤層は、請求項1〜3のいずれか1項に記載の放射線硬化性粘着剤組成物を含有するダイシング用粘着フィルム。 - 被加工物の一面に請求項4に記載のダイシング用粘着フィルムを貼付し、
前記ダイシング用粘着フィルムが貼付された被加工物を切断して切断片に分離し、
前記切断片に貼付されている粘着剤層に放射線を照射して前記粘着剤層の粘着力を低下させ、
前記粘着力を低下させたダイシング用粘着フィルムから前記切断片をピックアップする切断片の製造方法。 - 前記被加工物は、活性面を有する半導体ウェハである請求項5に記載の切断片の製造方法。
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