JP6559150B2 - 表面保護用シート - Google Patents
表面保護用シート Download PDFInfo
- Publication number
- JP6559150B2 JP6559150B2 JP2016555257A JP2016555257A JP6559150B2 JP 6559150 B2 JP6559150 B2 JP 6559150B2 JP 2016555257 A JP2016555257 A JP 2016555257A JP 2016555257 A JP2016555257 A JP 2016555257A JP 6559150 B2 JP6559150 B2 JP 6559150B2
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- curable resin
- meth
- urethane
- wafer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229920005989 resin Polymers 0.000 claims description 72
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- 238000000034 method Methods 0.000 claims description 35
- 239000010410 layer Substances 0.000 claims description 32
- 239000004065 semiconductor Substances 0.000 claims description 27
- 238000000227 grinding Methods 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 26
- 239000000758 substrate Substances 0.000 claims description 24
- 239000011231 conductive filler Substances 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 16
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- 235000012431 wafers Nutrition 0.000 description 71
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- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 description 3
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- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
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- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/21—Anti-static
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/402—Coloured
- B32B2307/4026—Coloured within the layer by addition of a colorant, e.g. pigments, dyes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/748—Releasability
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/14—Semiconductor wafers
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- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
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- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/314—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive layer and/or the carrier being conductive
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- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/40—Additional features of adhesives in the form of films or foils characterized by the presence of essential components
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- H—ELECTRICITY
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- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
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- H01L2221/683—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus 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
- H01L2221/68304—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus 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
- H01L2221/6834—Apparatus for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus 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 used to protect an active side of a device or wafer
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Description
〔1〕表面に回路が形成された半導体ウエハの裏面研削を行う際に用いる表面保護用シートであって、
無機導電性フィラーと硬化性樹脂(A)の硬化物とを含む帯電防止コート層及び支持フィルムからなる基材と、粘着剤層とを有し、
10%伸張時の1分経過後における基材の応力緩和率が60%以上であり、
基材のヤング率が100〜2000MPaである表面保護用シート。
無機導電性フィラーと硬化性樹脂(A)とを含む配合物を予備硬化層上に塗布し、塗膜層を形成する工程と、
予備硬化層と塗膜層とを硬化し、基材を形成する工程とを有する表面保護用シートの製造方法。
本発明の表面保護用シートに使用される基材は、帯電防止コート層と支持フィルムとからなる。以下において、帯電防止コート層、支持フィルムの順に説明する。
帯電防止コート層は、後述する支持フィルムの片面または両面を被覆するように形成される。帯電防止コート層を設けることで、本発明に係る表面保護用シートを被着体(例えば半導体ウエハや半導体チップ等)から剥離する際に剥離帯電により発生する静電気を効果的に拡散し、帯電防止性能が向上する。帯電防止コート層は、無機導電性フィラーと硬化性樹脂(A)の硬化物とからなり、無機導電性フィラーと硬化性樹脂(A)とを含む配合物を硬化する方法により得ることができる。
本発明の表面保護用シートに使用される支持フィルムは、樹脂シートであれば特に限定されず、各種の樹脂シートが使用可能である。このような樹脂シートとしては、例えば、ポリオレフィン、ポリ塩化ビニル、アクリルゴム、ウレタン等の樹脂フィルムが挙げられる。支持フィルムはこれらの単層であってもよいし、積層体からなってもよい。また、架橋等の処理を施したフィルムであってもよい。
エネルギー線硬化型含ウレタン樹脂としては、ウレタン(メタ)アクリレート樹脂やウレタンポリマーと、エネルギー線重合性モノマーとを主成分とするエネルギー線硬化型樹脂が挙げられる。
ウレタンポリマーはウレタン(メタ)アクリレートオリゴマーと異なり、分子中に(メタ)アクリロイル基等の重合性官能基を有しないウレタン系重合体であり、たとえば上述のポリオール化合物と多価イソシアネート化合物とを反応させて得ることができる。
エネルギー線重合性モノマーは、ウレタン(メタ)アクリレート樹脂を希釈するものとして上述したのと同じものを用いることができるほか、N,N−ジメチルアミノエチルアクリレート、N,N−ジメチルアミノプロピルメタクリルアミド、アクリロイルモルホリン、N,N−ジメチルアクリルアミド、N,N−ジエチルアクリルアミド、イミドアクリレート、N−ビニルピロリドン等の含窒素モノマーを用いてもよい。
本発明の表面保護用シートにおいては、帯電防止コート層上または支持フィルム上に粘着剤層が形成される。
本発明に係る表面保護用シートは、上記帯電防止コート層と支持フィルムとからなる基材の片面に粘着剤層が形成されてなる。粘着剤層は帯電防止コート層上または支持フィルム上に設けることができる。なお、図1においては、支持フィルム2上に粘着剤層3を形成している。
なお、上記の表面保護用シートの製造方法においては、予備硬化の段階で硬化性樹脂(B)を完全に硬化させてもよい。このような製造方法であっても、帯電防止コート層と支持フィルムとの密着性を向上させることができる。
本発明の表面保護用シートは、下記に示すように半導体ウエハの加工に用いることができる。
(ウエハ裏面研削方法)
ウエハの裏面研削においては、図1に示すように、表面に回路12が形成された半導体ウエハ11の回路面に表面保護用シート10を貼付して回路面を保護しつつウエハの裏面をグラインダー20により研削し、所定厚みのウエハとする。
さらにまた、本発明の表面保護用シートは、いわゆる先ダイシング法による高バンプ付ウエハのチップ化において好ましく用いられる。具体的には、バンプを有する回路が表面に形成された半導体ウエハ表面からそのウエハ厚さよりも浅い切込み深さの溝を形成し、該回路形成面に、表面保護用シートを貼付し、 その後、半導体ウエハの裏面研削をすることでウエハの厚みを薄くするとともに、最終的には個々のチップへの分割を行なう。
基材のヤング率は、万能引張試験機(オリエンテック社製テンシロンRTA−T−2M)を用いて、JIS K7161:1994に準拠して、23℃、湿度50%の環境下において引張速度200mm/分で測定した。
実施例または比較例で使用した基材を幅15mm、長さ100mmに切り出して試験片を得た。この試験片を、オリエンテック社製テンシロンRTA−100を用いて室温(23℃)にて速度200mm/分で引っ張った。10%伸張した状態で引張を停止し、その時の応力Aと、伸張停止の1分後の応力Bとから、応力緩和率=(A−B)/A×100(%)の式に基づいて応力緩和率を算出した。
実施例または比較例で作成した表面保護用シートをシリコンウエハ(200mmφ、厚み750μm)に、テープマウンター(リンテック社製Adwill RAD−3500)を用いて貼付した。その後、ディスコ社製 DFG−840を用いてシリコンウエハの厚みが150μmとなるように研削した。研削後、表面保護用シートを除去せずに、ウエハをJIS B 7513;1992に準拠した平面度1級の精密検査用の定盤上に、表面保護用シートが上側となるように載置した。
ウエハ回路面に、実施例または比較例の表面保護用シートを貼付し、ウエハと表面保護用シートとの積層体を得た。積層体について、積層体作成後から30日間、平均温度約23℃、平均湿度65%RHの環境下に放置した。放置後、まず、積層体を10×10cmの四角形に裁断した。次に、表面保護用シートをウエハから500mm/分で剥離した。このとき、表面保護用シートに帯電した帯電電位を50mmの距離から集電式電位測定機(春日電機社製 KSD−6110)により23℃、湿度65%RHの環境下で測定した(測定下限値0.1kV)。
研削後のウエハの反りを評価したのと同じ方法によりウエハを研削した後、表面保護用シートをウエハより剥離し、帯電防止コート層面をデジタル顕微鏡にて観察し、帯電防止コート層のクラックの有無を確認した。
分子量2000のポリエステル型ポリオールとイソホロンジイソシアネートから合成されたウレタンオリゴマーを骨格とし、その末端に2−ヒドロキシエチルアクリレートを付加して得た二官能ウレタンアクリレートオリゴマー(重量平均分子量8000)50質量部、アクリル系モノマー(エネルギー線重合性モノマー)としてのイソボルニルアクリレート25質量部と2−ヒドロキシ−3−フェノキシプロピルアクリレート25質量部の混合物、および光重合開始剤としてのダロキュア1173(製品名、BASF社製)1質量部を含む配合物を剥離フィルム上に塗布展延し、紫外線により硬化させてなる厚さ100μmの支持フィルムを得た。
エポキシアクリレート系樹脂100質量部(重量平均分子量2000)に、平均粒子径0.1μmのアンチモンドープ酸化スズ(ATO)を230質量部、光重合開始剤(BASF社製イルガキュア184)を2質量部配合した配合物を得た。この配合物を支持フィルムの片面に塗布し、紫外線を照射することにより厚みが2μmの帯電防止コート層を設けた。一方、支持フィルムの帯電防止コート層を設けた面とは逆の面に紫外線硬化型粘着剤を20μmの厚さになるように塗布し、粘着剤層を設けて表面保護用シートを作成した。各評価結果を表1に示す。
支持フィルムの製造においてウレタンアクリレートオリゴマーの重量平均分子量を3000とした以外は実施例1と同様にして表面保護用シートを作成した。各評価結果を表1に示す。
支持フィルムの製造においてウレタンアクリレートオリゴマーの重量平均分子量を6000とし、ATOの添加量を400質量部とし、帯電防止コート層の厚みを0.25μmとした以外は実施例1と同様にして表面保護用シートを作成した。各評価結果を表1に示す。
ATOの添加量を150質量部とし、帯電防止コート層の厚みを4.8μmとした以外は実施例1と同様にして表面保護用シートを作成した。各評価結果を表1に示す。
帯電防止コート層を設けなかった以外は実施例1と同様にして表面保護用シートを作成した。各評価結果を表1に示す。
支持フィルムの製造においてウレタンアクリレートオリゴマーの重量平均分子量を12000とした以外は実施例1と同様にして表面保護用シートを作成した。各評価結果を表1に示す。
支持フィルムの製造においてウレタンアクリレートオリゴマーの重量平均分子量を900とした以外は実施例1と同様にして表面保護用シートを作成した。各評価結果を表1に示す。
2・・・支持フィルム
3・・・粘着剤層
5・・・基材
10・・・表面保護用シート
Claims (4)
- 表面に回路が形成された半導体ウエハの裏面研削を行う際に用いる表面保護用シートであって、
無機導電性フィラーと硬化性樹脂(A)の硬化物とを含む帯電防止コート層及び硬化性樹脂(B)の硬化物を含む支持フィルムからなる基材と、粘着剤層とを有し、
10%伸張時の1分経過後における基材の応力緩和率が60%以上であり、
基材のヤング率が100〜2000MPaである表面保護用シート。 - 帯電防止コート層が、硬化性樹脂(A)の硬化物100質量部に対して無機導電性フィラーを150〜600質量部含有する請求項1に記載の表面保護用シート。
- 硬化性樹脂(B)が、エネルギー線硬化型含ウレタン樹脂である請求項1または2に記載の表面保護用シート。
- 硬化性樹脂(B)を含む配合物を工程シート上に塗布し予備硬化して、予備硬化層を形成する工程と、
無機導電性フィラーと硬化性樹脂(A)とを含む配合物を予備硬化層上に塗布し、塗膜層を形成する工程と、
予備硬化層と塗膜層とを硬化し、基材を形成する工程とを有する表面保護用シートの製造方法。
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PCT/JP2015/079724 WO2016063916A1 (ja) | 2014-10-23 | 2015-10-21 | 表面保護用シート |
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KR102175717B1 (ko) * | 2017-12-14 | 2020-11-06 | 주식회사 엘지화학 | 다이싱 다이 본딩 필름 |
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JPS60223139A (ja) | 1984-04-18 | 1985-11-07 | Nitto Electric Ind Co Ltd | 半導体ウエハ固定用接着薄板 |
JPS63153814A (ja) | 1986-07-09 | 1988-06-27 | F S K Kk | ウエハ貼着用粘着シ−ト |
JPH06101455B2 (ja) | 1987-05-27 | 1994-12-12 | リンテック株式会社 | ウエハ研摩用保護シ−トおよびこのシ−トを用いたウエハ面の研摩方法 |
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