TWI530545B - 加熱剝離型黏著片 - Google Patents
加熱剝離型黏著片 Download PDFInfo
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- TWI530545B TWI530545B TW101107222A TW101107222A TWI530545B TW I530545 B TWI530545 B TW I530545B TW 101107222 A TW101107222 A TW 101107222A TW 101107222 A TW101107222 A TW 101107222A TW I530545 B TWI530545 B TW I530545B
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- Prior art keywords
- heat
- expandable
- sensitive adhesive
- adhesive sheet
- adhesive layer
- Prior art date
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Classifications
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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
- 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
- C09J7/38—Pressure-sensitive adhesives [PSA]
-
- 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
- C09J7/40—Adhesives in the form of films or foils characterised by release liners
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
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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
- 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
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
-
- 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
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
-
- 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
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/28—Metal sheet
-
- 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
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
-
- 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
-
- 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
- C09J7/35—Heat-activated
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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Description
本發明係關於一種加熱剝離型黏著片。
於半導體晶圓之切割或背面研磨等加工、製造電子零件時之切斷等加工、及光學零件等之加工中,藉由確實地黏著於被加工物上而一體化,於該等加工時,欲藉由將被加工物經由加熱剝離型黏著片固定於加工機械上而使加工順利進行。
於加工此種被加工物之時,需要將被加工物固定於加熱剝離型黏著片之黏著劑層上之步驟。
於該步驟中,根據被加工物之種類選擇適當之加熱剝離型黏著片。此時,該等加熱剝離型黏著片之共同點在於均為無色透明之片狀,於該加熱剝離型黏著片之輥為新品時有包裝之狀態下,該包裝材上表示有品號等,因此即使存在複數種加熱剝離型黏著片,亦可根據被加工物之種類選擇加熱剝離型黏著片。
然而,一旦若自上述包裝材中取出複數種加熱剝離型黏著片之輥,則由於輥自身並未示有品號等,故而有無法從外觀上進行區別,無法於該等複數種加熱剝離型黏著片之間進行區別,混入其他加熱剝離型黏著片,從而無法對被加工物使用正確之加熱剝離型黏著片之虞。
進而,由於該加熱剝離型黏著片為無色透明,故貼附於被加工物時根據被加工物而貼附之視認性較差,無法順利
地進行貼合。
如專利文獻1所示,已知於藉由在加熱剝離型黏著片之發泡性黏著劑層中添加作為紅外線吸收性物質之黑色或藍色乃至綠色著色劑而賦予紅外線吸收性而成之加熱剝離型黏著片中,藉由著色吸收紅外線而進行有效之發熱、剝離。
然而,上述著色之目的並非欲根據不同品號而改變加熱剝離型黏著片之著色,而在於對藉由加熱而發泡之所有加熱剝離型黏著片進行同樣之著色。而且,結果對所有品號之加熱剝離型黏著片進行同樣之著色,於根據被加工物選擇加熱剝離型黏著片之時,無法於加熱剝離型黏著片之間進行區別。又,由於吸收紅外線,故加熱剝離型黏著片之透光性降低,大部分光無法穿透。
如專利文獻2所示,亦眾所周知於加熱剝離型黏著片之熱膨脹性黏著層中含有熱變色性微球顏料,但該熱變色性微球顏料係為確認黏著片是否均勻加熱而含有,故使用該熱膨脹性黏著層熱膨脹前之加熱剝離型黏著片前為無色透明,因而於使用加熱剝離型黏著片前,並未根據品號等而改變加熱剝離型黏著劑層之顏色。
專利文獻1:日本專利第4010643號
專利文獻2:日本專利特開2003-160767
於使用加熱剝離型黏著片時,有時會錯誤使用根據被加工物之差異或步驟之差異等而預定之加熱剝離型黏著片。因此,為防止產生此種錯誤,必需根據被加工物或步驟之差異明確地確認可使用之加熱剝離型黏著片。又,於無色透明之加熱剝離型黏著片之情形時,難以確認是否正確地貼附於被加工物上。
又,若使加熱剝離型黏著片之黏著劑層僅著色,則有源自著色劑之金屬離子附著於電子零件等被加工物表面上從而污染損傷電子零件之虞。
因此,本發明者等人使加熱剝離型黏著片之加熱剝離層中含有顏料,進而將該顏料添加量設為適當量,藉此謀求提高識別性、視認性,並且減少金屬離子之污染。
具體而言:
1.一種加熱剝離型黏著片,其特徵在於:於基材之單面或兩面設置含有熱膨脹性微球、著色劑之熱膨脹性黏著層,或於基材之單面或兩面經由著色中間層設置含有熱膨脹性微球之熱膨脹性黏著層,且總光線穿透率為50%以上。
2.如1之加熱剝離型黏著片,其係將上述加熱剝離型黏著片貼附於被加工物上,剝離後向被加工物之金屬轉印量藉由電感耦合電漿質量分析法獲得之測定值為1.0×1010atoms/cm2以下者。
3.如1或2之加熱剝離型黏著片,其係將上述加熱剝離型黏著片貼附於被加工物上,於40℃之溫度下放置1天後,經加熱剝離時向被加工物之金屬轉印量藉由電感耦合電漿質量分析法獲得之測定值為1.0×1010 atoms/cm2以下者。
本發明藉由提高添加顏料之卷帶之識別性,可於使用本發明之加熱剝離型黏著片加工複數種被加工物之情形時,根據被加工物之種類對應準備不同顏色之加熱剝離型黏著片。若經過此種準備後進行被加工物之加工,則可於使用時使適合於被加工物之加熱剝離型黏著片具有識別性,從而可準確無誤地使用上述加熱剝離型黏著片,故可更確實地加工被加工物。再者,於貼附於被加工物上時,藉由經著色之加熱剝離型黏著片可容易地確認是否正確貼附。
並且,藉由調節添加量而進行對金屬離子量之限制,減少對電子零件(被加工物)之影響。進而,於本發明中,加熱剝離型黏著片係將其貼附並剝離後自熱膨脹性黏著層向被加工物之金屬轉印量為特定值以下之轉印量極少者,亦有防止由金屬離子所導致之電子零件之短路等不良影響之效果。
本發明之加熱剝離型黏著片係於晶圓或電子零件等之加工時用於固定該等者,其特徵在於,於基材之單面或兩面設置含有熱膨脹性微球、著色劑之熱膨脹性黏著層,總光線穿透率為50%以上。
再者,作為將總光線穿透率設為50%以上之手段,可考慮使用著色膜作為基材膜,但可用作基材膜之膜且已上市之膜均無色透明等,無法藉由該基材膜進行顏色之識別。
進而,本發明之目的在於,於貼附加熱剝離型黏著片並剝離後,可使自熱膨脹性黏著層向電子零件等被加工物之金屬轉印量為特定值以下即轉印量極少,而可防止金屬離子對電子零件之不良影響。
並且,於使用上述本發明之加熱剝離型黏著片加工複數種被加工物之情形時,預先根據被加工物之種類對應準備不同顏色之加熱剝離型黏著片。於經過此種準備後為加工被加工物而貼附於被加工物上時,適合於被加工物之加熱剝離型黏著片具有識別性,可準確無誤地使用該加熱剝離型黏著片,故可更確實地加工被加工物。再者,本發明之目的在於,於貼附於被加工物上時,藉由經著色之加熱剝離型黏著片可容易地確認是否正確貼附。
因此,提出如下加熱剝離型黏著片,其特徵在於,如上述般於基材之單面或兩面設置含有熱膨脹性微球、著色劑之熱膨脹性黏著層,或者於基材之單面或兩面經由著色中間層設置含有熱膨脹性微球之熱膨脹性黏著層,且總光線穿透率為50%以上。
該加熱剝離型黏著片係以基材、及含有熱膨脹性微球與著色劑之熱膨脹性黏著層作為基本構成,含有熱膨脹性微球與著色劑之熱膨脹性黏著層可設置於基材之單面或兩面。於設置於基材之單面時,亦可於另一面設置接著劑
層。而且,於加工電子零件時,可將固定電子零件之包含該熱膨脹性黏著層之該加熱剝離型黏著片載置於加工裝置之載台上,藉由該基材之另一面之接著劑層固定於載台上。
當然,基材之另一面並非必需形成該接著劑層,於此情形時,亦可藉由將固定電子零件之包含該熱膨脹性黏著層之該加熱剝離型黏著片設置於加工裝置之載台上之固定機構例如真空夾盤等固定。
並且,本發明之加熱剝離型黏著片亦可設置用以保護位於其表面之熱膨脹性黏著層、基材、黏著劑層之分隔件。
以下對構成本發明之加熱剝離型黏著片之各層進行說明。
基材1為中間層2等之支持母體,使用具有未因熱膨脹性黏著層3之加熱處理而有損機械物性之程度之耐熱性者。
作為此種基材1,可列舉例如聚酯、烯烴系樹脂、聚氯乙烯等塑膠膜或片材,但並不限於該等。
基材1較佳為對切斷被加工物時所使用之切割器等切斷機構具有切斷性者。又,於使用軟質聚烯烴膜或片材等具備耐熱性與伸縮性之基材作為基材1之情形下,若於被加工物之切斷步驟時將切斷刀切入基材中,則其後可擴展基材,因此適合於必需於切斷片之間產生間隙之切斷片回收方式。
進而,於中間層2包含能量射線硬化型樹脂層之情形
時,由於使該層硬化時使用能量射線,故基材1(或熱膨脹性黏著層3等)必需由可穿透特定量以上之能量射線之材料構成。基材1可為單層亦可為多層體。又,亦可藉由下述適當之剝離劑對基材1進行表面處理,於該處理面上形成能量射線硬化型樹脂層,其後對能量射線硬化型加熱剝離型黏著片照射能量射線,使該能量射線硬化型樹脂層硬化後,剝離基材1,藉此使該能量射線硬化型加熱剝離型黏著片本身薄層化。
基材1之厚度可於無損被加工物之貼合、被加工物之切斷、切斷片之剝離、回收等各步驟之操作性或作業性之範圍內適當地選擇,通常為500 μm以下,較佳為3~300 μm左右,更佳為5~150 μm左右。
基材1之表面亦可為提高與鄰接層之密接性、保持性等而進行慣用之表面處理,例如鉻酸處理、臭氧暴露、火焰暴露、高壓電擊暴露、離子化放射線處理等化學或物理處理、藉由底塗劑(例如下述黏著物質)之塗佈處理等。
熱膨脹性黏著層3含有用以賦予黏著性之黏著性物質、及用以賦予熱膨脹性之熱膨脹性微球。
熱膨脹性黏著層係藉由發泡劑因熱所致之發泡而減少接著面積從而使剝離變得容易之層,作為所使用之發泡劑,使用熱膨脹性微球。發泡劑可單獨使用或組合2種以上使用。
作為熱膨脹性微球,可自公知之熱膨脹性微球中適當選
擇。作為熱膨脹性微球,由於為未微膠囊化之發泡劑時有無法穩定表現良好之剝離性之情況,因此可較佳地使用微膠囊化之發泡劑。
作為上述黏著性物質,使用具有加熱時容許且不約束熱膨脹性微球之發泡及/或膨脹之程度之彈性者。因此,可使用先前公知之黏著劑等。作為黏著劑,例如可例示:天然橡膠或各種合成橡膠等橡膠系黏著劑、聚矽氧系黏著劑、(甲基)丙烯酸烷基酯與可與該酯共聚合之其他不飽和單體之共聚物等丙烯酸系黏著劑(例如,作為上述能量射線硬化型樹脂層2之母劑而記載之丙烯酸系黏著劑等)、乙烯基烷基醚系黏著劑、聚酯系黏著劑、聚醯胺系黏著劑、胺基甲酸酯系黏著劑、苯乙烯-二烯嵌段共聚物系黏著劑等。
進而,該等黏著劑可使用調配有熔點約為200℃以下之熱熔融性樹脂之蠕變特性改良型黏著劑等公知之黏著劑,可單獨使用1種或組合2種以上使用(例如參照日本專利特開昭56-61468號公報、日本專利特開昭61-174857號公報、日本專利特開昭63-17981號公報、日本專利特開昭56-13040號公報等)。
又,熱膨脹性黏著層3中亦可使用能量射線硬化型黏著劑。於此情形時,若能量射線照射後之動態彈性模數於開始熱膨脹性微球之膨脹之溫度範圍內,剪切儲存彈性模數為1×105~5×107 Pa(頻率:1 Hz,樣品:厚度為1.5 mm、膜狀),則可獲得良好之剝離性。
並且,就黏著性等觀點而言,較佳為於該等之中使用丙烯酸系黏著劑。
作為上述丙烯酸系黏著劑,可使用以將1種或2種以上之(甲基)丙烯酸烷基酯(例如甲酯、乙酯、丙酯、異丙酯、丁酯、異丁酯、第二丁酯、第三丁酯、戊酯、己酯、庚酯、辛酯、2-乙基己酯、異辛酯、異癸酯、十二酯、十三酯、十五酯、十六酯、十七酯、十八酯、十九酯、二十酯等C1-20烷基酯等)用作單體成分之丙烯酸系聚合物(均聚物或共聚物)作為基底聚合物之丙烯酸系黏著劑等。
再者,為改質凝聚力、耐熱性、交聯性等,上述丙烯酸系聚合物視需要亦可含有可與上述(甲基)丙烯酸烷基酯共聚合之其他單體成分所對應之單元。作為此種單體成分,例如可列舉:丙烯酸、甲基丙烯酸、丙烯酸羧基乙酯、丙烯酸羧基戊酯、衣康酸、順丁烯二酸、反丁烯二酸、丁烯酸等含羧基單體;順丁烯二酸酐、衣康酸酐等酸酐單體;(甲基)丙烯酸羥基乙酯、(甲基)丙烯酸羥基丙酯、(甲基)丙烯酸羥基丁酯、(甲基)丙烯酸羥基己酯、(甲基)丙烯酸羥基辛酯、(甲基)丙烯酸羥基癸酯、(甲基)丙烯酸羥基月桂酯、甲基丙烯酸(4-羥基甲基環己基)甲酯等含羥基單體;苯乙烯磺酸、烯丙基磺酸、2-(甲基)丙烯醯胺-2-甲基丙磺酸、(甲基)丙烯醯胺丙磺酸、(甲基)丙烯酸磺丙酯、(甲基)丙烯醯氧基萘磺酸等含磺酸基單體;(甲基)丙烯醯胺、N,N-二甲基(甲基)丙烯醯胺、N-丁基(甲基)丙烯醯胺、N-
羥甲基(甲基)丙烯醯胺、N-羥甲基丙烷(甲基)丙烯醯胺等(N-取代)醯胺系單體;(甲基)丙烯酸胺基乙酯、(甲基)丙烯酸N,N-二甲基胺基乙酯、(甲基)丙烯酸第三丁基胺基乙酯等(甲基)丙烯酸胺基烷基酯系單體;(甲基)丙烯酸甲氧基乙酯、(甲基)丙烯酸乙氧基乙酯等(甲基)丙烯酸烷氧基烷基酯系單體;N-環己基順丁烯二醯亞胺、N-異丙基順丁烯二醯亞胺、N-月桂基順丁烯二醯亞胺、N-苯基順丁烯二醯亞胺等順丁烯二醯亞胺系單體;N-甲基衣康醯亞胺、N-乙基衣康醯亞胺、N-丁基衣康醯亞胺、N-辛基衣康醯亞胺、N-2-乙基己基衣康醯亞胺、N-環己基衣康醯亞胺、N-月桂基衣康醯亞胺等衣康醯亞胺系單體;N-(甲基)丙烯醯氧基亞甲基琥珀醯亞胺、N-(甲基)丙烯醯基-6-氧基六亞甲基琥珀醯亞胺、N-(甲基)丙烯醯基-8-氧基八亞甲基琥珀醯亞胺等琥珀醯亞胺系單體;乙酸乙烯酯、丙酸乙烯酯、N-乙烯基吡咯烷酮、甲基乙烯基吡咯烷酮、乙烯基吡啶、乙烯基哌啶酮、乙烯基嘧啶、乙烯基哌、乙烯基吡、乙烯基吡咯、乙烯基咪唑、乙烯基唑、乙烯基啉、N-乙烯基羧醯胺類、苯乙烯、α-甲基苯乙烯、N-乙烯基己內醯胺等乙烯基系單體;丙烯腈、甲基丙烯腈等氰基丙烯酸酯單體;(甲基)丙烯酸縮水甘油酯等含環氧基之丙烯酸系單體;聚乙二醇(甲基)丙烯酸酯、聚丙二醇(甲基)丙烯酸酯、甲氧基乙二醇(甲基)丙烯酸酯、甲氧基聚丙二醇(甲基)丙烯酸酯等二醇系丙烯酸酯單體;(甲基)丙烯酸四氫糠酯、氟(甲基)丙烯酸酯、聚矽氧(甲基)丙烯酸酯等具有雜
環、鹵素原子、矽原子等之丙烯酸酯系單體;己二醇二(甲基)丙烯酸酯、(聚)乙二醇二(甲基)丙烯酸酯、(聚)丙二醇二(甲基)丙烯酸酯、新戊二醇二(甲基)丙烯酸酯、季戊四醇二(甲基)丙烯酸酯、三羥甲基丙烷三(甲基)丙烯酸酯、季戊四醇三(甲基)丙烯酸酯、二季戊四醇六(甲基)丙烯酸酯、環氧丙烯酸酯、聚酯丙烯酸酯、丙烯酸胺基甲酸酯等多官能單體;異戊二烯、丁二烯、異丁烯等烯烴系單體;乙烯醚等乙烯醚系單體等。該等單體成分可使用1種或2種以上。
關於上述黏著劑,就加熱處理前之適度之接著力與加熱處理後之接著力之降低性的平衡之觀點而言,更佳之黏著劑為以自常溫至150℃之溫度下動態彈性模數為5萬~1000萬dyn/cm2之範圍內之聚合物作為基底的感壓接著劑。
作為著色劑,可使用顏料或染料等。
作為上述顏料,例如可列舉作為有機顏料之丙烯酸系顏料、偶氮系顏料、多偶氮系顏料、蒽醌系顏料、喹吖啶酮系顏料、異吲哚啉系顏料、異吲哚啉酮系顏料、酞菁系顏料、苝系顏料、DPP(Diphenylphosphine,二苯基膦)系顏料、螢光顏料、縮合多環顏料、著色樹脂粒子等,以及作為無機顏料之碳黑、合成二氧化矽、氧化鉻、酸化鉄、氧化鈦、硫化鋅、煅燒顏料、天然雲母等公知之顏料。
作為染料,可使用酸性染料、反應染料、直接染料、分散染料、陽離子染料、高分子染料等公知之任一形態之染
料。
該等著色劑之中,若為著色力較強之顏料及染料,則使其含於熱膨脹性黏著層中時亦可藉由更少之添加量進行同程度之著色。又,若採用不含有金屬元素、或於著色劑中以金屬元素不會分離之程度較強地結合金屬元素而成之顏料或染料,則於使用時可降低被加工物表面之金屬元素附著量。
熱膨脹性黏著層中之著色劑之濃度相對於構成熱膨脹性黏著層3之黏著劑基底聚合物100重量份,為0.01~1.5重量份,較佳為0.3~1.0重量份。若為此範圍內,則可獲得著色為使用者可視認之程度且著色劑或源自著色劑之金屬元素不會附著於被加工物上之加熱剝離型黏著片。
作為熱膨脹性微球,只要為使例如異丁烷、丙烷、戊烷等藉由加熱容易氣化而膨脹之物質內含於具有彈性之殼內之微球即可。上述殼通常由熱塑性物質、熱熔融性物質、藉由熱膨脹破裂之物質等形成。作為形成上述殼之物質,例如可列舉:偏二氯乙烯-丙烯腈共聚物、聚乙烯醇、聚乙烯丁醛、聚甲基丙烯酸甲酯、聚丙烯腈、聚偏二氯乙烯、聚碸等。熱膨脹性微球可藉由慣用之方法例如凝聚法、界面聚合法等製造。作為熱膨脹性微球,亦可利用例如Matsumoto Microsphere(商品名,松本油脂製藥股份有限公司製)等市售品。
就分散性或薄層形成性等方面而言,熱膨脹性微球之平
均粒徑通常為1~80 μm左右,較佳為3~50 μm左右。又,作為熱膨脹性微球,為藉由加熱處理有效地降低含有黏著劑之熱膨脹性黏著層之黏著力,較佳為具有體積膨脹係數達到5倍以上、尤其是10倍以上仍不破裂之適度強度者。再者,於使用以較低之膨脹係數破裂之熱膨脹性微球之情形或使用未微膠囊化之熱膨脹劑之情形時,無法充分地減少黏著層3與被加工物之黏著面積,難以獲得良好之剝離性。
熱膨脹性微球之使用量亦根據其種類而不同,相對於構成熱膨脹性黏著層3之黏著劑基底聚合物100重量份,例如為10~200重量份,較佳為20~125重量份,更佳為20~50重量份。若未達10重量份,則加熱處理後之有效之黏著力降低易不充分,又,若超過200重量份,則易產生熱膨脹性黏著層3之凝聚破壞,或於基材上設有中間層之情形時與該中間層之間產生界面破壞。
於熱膨脹性黏著層3中,除黏著劑、熱膨脹性微球之外,亦可調配交聯劑(例如聚異氰酸酯、烷基醚化三聚氰胺化合物等)、黏著賦予劑(例如多官能性環氧化合物,或異氰酸酯化合物、氮丙啶化合物、三聚氰胺樹脂、松香衍生物樹脂、聚萜烯樹脂、石油樹脂、油溶性酚樹脂、尿素樹脂、無水化合物、聚胺、含羧基聚合物等)、塑化劑、顏料、填充劑、防老化劑、界面活性劑、抗靜電劑等適當之添加劑。
本發明中之中間層係用以提高基材與熱膨脹性黏著層之接著性,於使用加熱剝離型黏著片時,抵抗加工被加工物時施加於熱膨脹性黏著層之剪切力及推壓力而保持熱膨脹性黏著層,從而使被加工物不發生位移而穩定地加工之層,藉由進而含有著色劑而著色加熱剝離型黏著片本身,並且減少表面層且為與被加工物接著之熱膨脹性黏著層中所含之著色劑量,藉此用以防止由金屬離子等所導致之被加工物表面之污染。
作為此種中間層,包含可使基材與熱膨脹性黏著層之密接性優異,且彈性模數及硬度高於熱膨脹性黏著層之材料,例如可使用能量射線硬化型樹脂、及可用於上述熱膨脹性黏著層之黏著性物質中凝聚力較大之樹脂等。
能量射線硬化型樹脂含有用以賦予能量射線硬化性之能量射線硬化性化合物(或能量射線硬化性樹脂),並且具有壓接熱膨脹性黏著層3時可緩和熱膨脹性微球之凹凸之程度的黏彈性。又,該能量射線硬化型樹脂較佳為經能量射線照射後成為彈性體者。就此種觀點而言,使用該能量射線硬化型樹脂之中間層較佳為由將能量射線硬化性化合物(或能量射線硬化性樹脂)調配於具有彈性之母劑中之組合物而構成。
作為該母劑,較佳為於上述黏著性物質中混合有能量射線硬化型樹脂者,藉此可使中間層獲得需要之物性。
作為用以使能量射線硬化型樹脂層進行能量射線硬化之能量射線硬化性化合物,若為可藉由可見光線、紫外線、
電子束等能量射線而硬化者則無特別限定,較佳為可使能量射線照射後之能量射線硬化型樹脂層之三維網狀化有效地完成者。能量射線硬化性化合物可單獨使用1種或組合2種以上使用。
作為能量射線硬化性化合物之具體例,例如可列舉:三羥甲基丙烷三丙烯酸酯、四羥甲基甲烷四丙烯酸酯、季戊四醇三丙烯酸酯、季戊四醇四丙烯酸酯、二季戊四醇單羥基五丙烯酸酯、二季戊四醇六丙烯酸酯、1,4-丁二醇二丙烯酸酯、1,6-己二醇二丙烯酸酯、聚乙二醇二丙烯酸酯等。
亦可使用能量射線硬化性樹脂作為能量射線硬化性化合物,作為能量射線硬化性樹脂,例如可列舉:於分子末端具有(甲基)丙烯醯基之酯(甲基)丙烯酸酯、(甲基)丙烯酸胺基甲酸酯、環氧(甲基)丙烯酸酯、三聚氰胺(甲基)丙烯酸酯、丙烯酸系樹脂(甲基)丙烯酸酯、於分子末端具有烯丙基之硫醇-烯加成型樹脂或光陽離子聚合型樹脂、聚乙烯基桂皮酸酯等含桂皮醯基之聚合物、經重氮化之胺基酚醛清漆樹脂或丙烯醯胺型聚合物等含感光性反應基之聚合物或低聚物等。進而作為藉由高能量射線反應之聚合物,可列舉環氧化聚丁二烯、不飽和聚酯、聚甲基丙烯酸縮水甘油酯、聚丙烯醯胺、聚乙烯基矽氧烷等。
再者,於使用能量射線硬化性樹脂之情形時,未必必需上述母劑。
能量射線硬化性化合物之調配量例如相對於母劑100重
量份為5~500重量份左右,較佳為15~300重量份,更佳為20~150重量份左右之範圍。又,若包含能量射線硬化型樹脂層之中間層之能量射線照射後之動態彈性模數於20℃之溫度下,剪切儲存彈性模數為5×106~1×1010Pa(頻率:1Hz,樣品:厚度1.5mm、膜狀),則可並存優異之切斷作業性與加熱剝離性。該儲存彈性模數可藉由適當選擇能量射線硬化性化合物之種類及調配量、能量射線照射條件等而調整。
再者,根據需要亦可與能量射線聚合起始劑併用能量射線聚合促進劑。
藉由設置此種中間層,可使熱膨脹性黏著層之層厚更薄,故於加工被加工物時可藉由較薄之膜厚穩定地保持被加工物。
又,即便於藉由使中間層本身含有著色劑而自中間層產生金屬離子之情形時,亦可藉由在與熱膨脹性黏著層之界面阻斷該金屬離子,使得使用後不會污染被加工物表面。
於中間層中,除上述成分之外,根據需要可調配用以使能量射線硬化性化合物硬化之能量射線聚合起始劑、及用以於能量射線硬化前後獲得適當之黏彈性之熱聚合起始劑、交聯劑、黏著賦予劑、加硫劑等適當之添加劑、以及填充劑、防老化劑、抗氧化劑、著色劑。
作為能量射線聚合起始劑,可根據所使用之能量射線之種類適當選擇公知或慣用之聚合起始劑。
於使用紫外線作為能量射線進行聚合、硬化之情形時,
為進行硬化而含有光聚合起始劑。作為光聚合起始劑,並無特別限定,例如可列舉:安息香甲醚、安息香異丙醚、2,2-二甲氧基-1,2-二苯基乙烷-1-酮等安息香醚;苯甲醚甲醚等取代安息香醚;2,2-二乙氧基苯乙酮、2,2-二甲氧基-2-苯基苯乙酮、1-羥基-環己基-苯基酮等取代苯乙酮;2-甲基-2-羥基苯丙酮等取代α-酮醇;2-萘磺醯氯等芳香族磺醯氯;1-苯基-1,1-丙二酮-2-(鄰乙氧羰基)-肟等光活性肟;2,4,6-三甲基苯甲醯基-二苯基-氧化膦、雙(2,4,6-三甲基苯甲醯基)-苯基氧化膦等醯基氧化膦等。
熱膨脹性黏著層3之形成例如可藉由以下等適當方法進行,即於基材上或經由基材1上所設之中間層2塗佈含有黏著劑、著色劑、熱膨脹性微球、及根據需要之添加劑、溶劑等之塗佈液,並經由分隔件4壓接之方法;以及於適當之分隔件(剝離紙等)4上塗佈上述塗佈液而形成熱剝離型黏著劑層3,並將其壓接轉印(移著)於基材1上或基材上所設之中間層2上之方法等。
該分隔件4係於基材膜之單面視需要形成剝離劑層而成者,且亦為保護本發明之加熱剝離型黏著片之表面層,為於使用前露出而剝離之片材,以及成為形成熱膨脹性黏著層時之基礎之片材。
作為分隔件4之基材膜,可使用公知者,例如可自聚醚醚酮、聚醚醯亞胺、聚芳酯、聚萘二甲酸乙二酯、聚乙烯膜、聚丙烯膜、聚丁烯膜、聚丁二烯膜、聚甲基戊烯膜、
聚氯乙烯膜、氯乙烯共聚物膜、聚對苯二甲酸乙二酯膜、聚對苯二甲酸丁二酯膜、聚胺基甲酸酯膜、乙烯-乙酸乙烯酯共聚物膜、離子聚合物樹脂膜、乙烯-(甲基)丙烯酸共聚物膜、乙烯-(甲基)丙烯酸酯共聚物膜、聚苯乙烯膜、及聚碳酸酯膜等塑膠膜等中選擇。
可使用之剝離劑層係根據黏著劑層之樹脂選擇含有經氟化之聚矽氧樹脂系剝離劑、氟樹脂系剝離劑、聚矽氧樹脂系剝離劑、聚乙烯醇系樹脂、聚丙烯系樹脂、長鏈烷基化合物等公知之剝離劑而成之層。
熱膨脹性黏著層3之厚度可根據黏著片之使用目的或由加熱所導致之黏著力之減少性等適當地決定,為保持表面平滑性,較佳為設定為熱膨脹性微球之最大徑以下。因此,熱膨脹性黏著層3之厚度為80 μm以下,較佳為50 μm以下,更佳為20 μm以下。於中間層2上形成熱膨脹性黏著層3之情形時,若熱膨脹性黏著層3之厚度為50 μm以下,則可獲得足以保持被加工物之黏著力,並且由於加工電子零件時向該電子零件施加推壓力及剪切力,因此亦向熱膨脹性黏著層3施加該等力,但由於熱膨脹性黏著層3之厚度較薄,故可抵抗該施加力而使本發明之加熱剝離型黏著片確實地保持該電子零件。
作為分隔件4,例如可使用包含藉由以聚矽氧系樹脂、長鏈烷基丙烯酸酯系樹脂、氟系樹脂等為代表之剝離劑進行表面塗佈之塑膠膜及紙等之基材,或包含聚乙烯或聚丙烯等無極性聚合物之黏著性較小之基材等。
如上所述,分隔件4可用作將熱膨脹性黏著層3壓接轉印(移著)於中間層2上時之暫時支持體,以及保護熱膨脹性黏著層3直至供至實際應用為止之保護材。
再者,中間層2及熱膨脹性黏著層3不僅可形成於基材1之單面,亦可形成於兩面。圖2係表示本發明之加熱剝離型黏著片之另一例的概略剖面圖。
如圖2所示,亦可於基材1之一面視需要經由中間層2設置熱膨脹性黏著層3,於另一面設置通常之接著劑層5。又,為防止隨著加熱處理時之熱膨脹性黏著層3之凹凸變形而於與被加工物之接著界面發生微細之凝聚破壞,亦可進而於該熱膨脹性黏著層3上設置黏著層。作為該黏著層之黏著物質,可使用上述熱膨脹性黏著層3所記載之黏著劑。就對被加工物之黏著力之減少乃至喪失之觀點而言,該黏著層之厚度較佳為0.1~8 μm,尤其為1~5 μm,可藉由按照熱膨脹性黏著層3之方法形成。
於圖2之例中,於基材1之一面上依序積層中間層2、熱膨脹性黏著層3及分隔件4,並且於基材1之另一面上積層接著劑層5及分隔件6。該黏著片僅有一點與圖1之黏著片不同,即於基材1之與中間層2及於其上形成有熱剝離型黏著劑層3之面為相反側之一面上設置有接著劑層5與分隔件6。
接著劑層5含有黏著性物質。作為該黏著性物質,可使用與上述熱膨脹性黏著層3中之黏著性物質(黏著劑)相同者,根據需要亦可調配交聯劑(例如異氰酸酯系交聯劑、
環氧系交聯劑等)、黏著賦予劑(例如松香衍生物樹脂、聚萜烯樹脂、石油樹脂、油溶性酚樹脂等)、塑化劑、填充劑、防老化劑、界面活性劑等適當之添加劑。其中,使用或添加明顯阻礙使能量射線硬化型樹脂層硬化之能量射線穿透之物質時欠佳。
接著劑層5之厚度可於不損害熱膨脹性黏著層3向被加工物之壓接、被加工物之切斷及切斷片之剝離、回收等操作性等之範圍內適當地設定,通常為1~50 μm,較佳為3~30 μm左右。
接著劑層5之形成可藉由按照熱膨脹性黏著層3之方法進行。作為分隔件6,可使用與上述熱膨脹性黏著層3上之分隔件4相同者。此種黏著片藉由利用接著劑層5,可固定於基座面上使用。
根據需要於基材1之單面或兩面藉由任意手段均勻塗佈形成中間層2之組合物。並且,於所得之形成於基材1之單面或兩面上之中間層2為能量射線硬化型之情形時,當含有反應性溶劑以外之溶劑時,此種溶劑為藉由乾燥而去除之狀態,使該中間層處於藉由能量射線硬化前之狀態。其中,只要具備充分之流動性,則亦可使其部分硬化。
於中間層2並非能量射線硬化型之情形時,塗佈形成中間層2之組合物並加以乾燥。
另外於所準備之分隔件上形成經塗佈乾燥之熱膨脹性黏著層3。該熱膨脹性黏著層由於其表面即並非分隔件側之
面所含有之熱膨脹性微球並未完全埋入該熱膨脹性黏著層中,故該熱膨脹性微球之一部分突出於表面而形成凸部。
繼而,將上述分隔件4上所形成之該熱膨脹性黏著層3以對準形成有該凸部之表面之方式積層於上述硬化前之該中間層2之表面,並自該基材1及該分隔件4側相互推壓該中間層2與該熱膨脹性黏著層3,藉此使該凸部埋入未硬化之該中間層之內部。
其結果,可獲得依序積層該基材1、未硬化之該中間層2、該熱膨脹性黏著層3及分隔件4而成之片材。
進而,藉由自基材1側及/或分隔件4側對該未硬化之該中間層2照射能量射線而使未硬化之該中間層2硬化,由此可獲得本發明之加熱剝離型黏著片。
當然亦可不使用分隔件4而直接於基材1上塗佈、乾燥熱膨脹性黏著劑。
該加熱剝離型黏著片之製造方法係於基材1之單面設置中間層2與熱膨脹性黏著層3之方法,於基材1之兩面設置中間層2與熱膨脹性黏著層3時,可於基材之單面逐次實施該方法,亦可對基材之兩面同時實施該方法。又,於基材之另一面設置接著劑層5之情形時,可於設置中間層2與熱膨脹性黏著層3之步驟前後之任一階段進行該接著劑層5之形成。
圖3係表示使用本發明之加熱剝離型黏著片的切斷片之製造方法之一例的概略步驟圖。更詳細而言,圖3係以剖
面圖表示以下一系列步驟之步驟圖,即於圖1之加熱剝離型黏著片(剝離分隔件4之狀態者)之熱膨脹性黏著層3之表面壓接並貼合被加工物7,藉由能量射線8之照射等使中間層2硬化後,沿切斷線9切斷成特定尺寸,形成切斷片,繼而藉由加熱處理使熱膨脹性黏著層3中之熱膨脹性微球膨脹及發泡,剝離回收切斷片7a。再者,亦可藉由能量射線8之照射使中間層2硬化後,於熱膨脹性黏著層3表面壓接並貼合被加工物7,沿切斷線9切斷。
又,本發明之加熱剝離型黏著片之用途不僅限於此種切斷,通常用於研磨、開孔等加工步驟。
圖3中,1表示基材,2a表示能量射線照射後經硬化之中間層,3a表示能量射線照射後進而藉由加熱使熱膨脹性微球膨脹後之熱膨脹性黏著層。加熱剝離型黏著片之熱膨脹性黏著層3與被加工物7之壓接例如可藉由以橡膠輥、層壓輥、按壓裝置等適當之推壓機構進行壓接處理之方式等進行。再者,壓接處理時,若需要則亦可根據黏著性物質之類型,於熱膨脹性微球不膨脹之溫度範圍內加熱,或塗佈水或有機溶劑而賦予黏著性物質活性。
作為能量射線8,可使用可見光線或紫外線、電子束等。能量射線8之照射可採用適當之方法進行。其中,有時由於能量射線8之照射熱導致熱膨脹性微球開始膨脹,故較理想為儘可能限制為短時間之照射,或對加熱剝離型黏著片進行風冷等而保持在熱膨脹性微球不開始膨脹之溫度下。
被加工物7之切斷可藉由切割等慣用之切斷手段進行。加熱條件可根據被加工物7(或切斷片7a)之表面狀態或耐熱性、熱膨脹性微球之種類、黏著片之耐熱性、被加工物之熱容量等適當地設定,通常條件為溫度為350℃以下、處理時間為30分鐘以下,特佳為溫度為80~200℃、處理時間為1秒~15分鐘左右。又,作為加熱方式,可列舉熱風加熱方式、熱板接觸方式、紅外線加熱方式等,但並無特別限定。
又,於黏著片之基材1使用具有伸縮性者之情形時,擴展處理例如可藉由使用使片材類二維地擴展時所用之慣用之擴展手段而進行。
由於本發明之加熱剝離型黏著片包含含有黏著性物質(黏著劑)之熱膨脹性黏著層3,故可牢固地黏著保持被加工物7,被加工物7不會由於例如搬送時之振動等而剝離。又,由於可形成較薄之熱膨脹性黏著層3,且可使中間層2於切斷步驟前硬化,故較之先前之加熱剝離型黏著片,可大幅減少於切斷步驟時由切斷刀所導致之接著劑層之上卷及伴隨接著劑層等之移動之碎屑等,並且切斷成特定之尺寸。進而,熱膨脹性黏著層3含有熱膨脹性微球,具有熱膨脹性,故藉由切斷步驟後之加熱處理使熱膨脹性微球迅速發泡或膨脹,而使上述熱膨脹性黏著層3發生體積變化形成凹凸狀之三維構造,與所切斷之切斷片7a之接著面積乃至接著強度大幅降低或喪失。如此,藉由中間層2之硬化、及由加熱處理引起之接著強度之明顯降低或喪失,可
大幅改善被加工物7之切斷步驟、切斷片7a之剝離、回收步驟中之操作性及作業性,生產效率亦大幅提高。
本發明之加熱剝離型黏著片亦可用於永久接著被加工物之用途,但適用於要求或希望將被加工物接著特定時間,並且於達成接著目的後解除該接著狀態之用途。作為此種用途之具體例,除半導體晶圓或陶瓷積層片之固定材之外,可列舉各種電氣裝置、電子裝置、顯示裝置等之組裝步驟中之零件搬送用、暫時固定用等之載帶、暫時固定材或固定材、及目的在於防止金屬板、塑膠板、玻璃板等之污染損傷之表面保護材或遮蔽材等。尤其是於電子零件之製造步驟中,可較佳地用於較小或薄層之半導體晶片或積層電容器晶片等之製造步驟等。
藉由以下步驟製作實施例1之加熱剝離型黏著片。
首先,製備含有丙烯酸2-乙基己酯-丙烯酸乙酯-甲基丙烯酸甲酯(依序以30、70、5重量份之比例聚合)共聚物系感壓接著劑100重量份(調配1重量份異氰酸酯系交聯劑)之甲苯溶液,以乾燥後之厚度成為15 μm左右之方式塗佈於成為基材之厚度為100 μm之聚酯膜上,獲得橡膠狀有機彈性層。
繼而,製備於丙烯酸2-乙基己酯-丙烯酸乙酯-甲基丙烯酸甲酯共聚物系感壓接著劑100重量份(調配2重量份異氰酸酯系交聯劑)中調配有Matsumoto Microsphere-F-501D 30
重量份(商品名,松本油脂製藥股份有限公司製)、含金屬元素之固形顏料0.01重量份之甲苯溶液,以乾燥後之厚度成為35 μm左右之方式塗佈於分隔件上,獲得熱膨脹性黏著層。
最後,將熱膨脹性黏著層表面貼合於聚酯膜上之橡膠狀有機彈性層上,藉此製作實施例1之加熱剝離型黏著片。
調配0.5重量份代替調配0.01重量份含金屬元素之固形顏料,除此之外,以與實施例1相同之方法獲得實施例2之加熱剝離型黏著片。
調配0.8重量份代替調配0.01重量份含金屬元素之固形顏料,除此之外,以與實施例1相同之方法獲得實施例3之加熱剝離型黏著片。
調配1.0重量份代替調配0.01重量份含金屬元素之固形顏料,除此之外,以與實施例1相同之方法獲得實施例4之加熱剝離型黏著片。
比較例1之加熱剝離型黏著片除調配3.0重量份固形顏料之外,以與實施例1相同之方法製作。
又,藉由ICP-MS(電感耦合電漿質量分析法)將該黏著片向被加工物之金屬轉印量(本評價中使用添加含酞菁銅之顏料之黏著片)定量化(測定方法如以下所示)。
首先,將黏著片貼合於半導體製造時所用之矽晶圓(鏡面,100 mm厚)上,藉由2 kg定負荷之橡膠輥進行壓接。於40℃之溫度下放置1天後,藉由加熱發泡而剝離黏著片。其次,以適當之氫氟酸蝕刻矽晶圓之片材剝離面側之氧化膜整體。將藉由蝕刻所得之液體全部採取於蒸發皿中,進行加熱、蒸發乾燥,並將殘渣溶解於酸中而獲得測定供試液。藉由ICP-MS測定所得之供試液。將藉由測定所得之元素質量(ng)除以Cu之原子量,換算為莫耳數,乘以阿佛加德羅數轉換為原子數,將該值除以經蝕刻之矽晶圓之面積,藉此換算為每單位面積之原子數(atoms/cm2)。
將所得結果示於以下。
於上述實施例中,可確認於ICP-MS中,片材剝離面之銅轉印量為檢測極限以下。關於上述測定值,作為實質上無或幾乎無來自金屬元素之污染或附著之判斷手法,可列舉如下方法:將含金屬元素之黏著片應用於半導體被加工對象物,剝離後,藉由ICP-MS測定向半導體被加工對象物(例如矽晶圓之鏡面)之轉印物,於該情形時,測定半導體被加工對象物表面之金屬為1.0×1010 atoms/cm2以下。
根據以上,藉由添加顏料可提高視認性、識別性,並且藉由限制顏料之添加量,可確保足以確認片材之貼附之穿透率,可將由貼附材料上之金屬元素引起之污染抑制在最小限度。因此,即便於被加工物為電子零件之情形時,亦無因金屬離子之污染而對該電子零件造成不良影響之虞。
進而即使變更顏料之種類亦具備相同之性質。因此,準備呈各種顏色之加熱剝離型黏著片,一面根據被加工物之種類藉由顏色進行區別,一面選擇、使用適當之加熱剝離型黏著片。
1‧‧‧基材
2‧‧‧中間層
2a‧‧‧能量射線照射後之經硬化之中間層
3‧‧‧熱膨脹性黏著層
3a‧‧‧熱膨脹性微球膨脹後之熱膨脹性黏著層
4‧‧‧分隔件
5‧‧‧接著劑層
6‧‧‧分隔件
7‧‧‧被加工物
7a‧‧‧切斷片
8‧‧‧能量射線
9‧‧‧切斷線
圖1係表示本發明之加熱剝離型黏著片。
圖2係表示本發明之加熱剝離型黏著片之另一例。
圖3係表示使用本發明之加熱剝離型黏著片之例。
1‧‧‧基材
2‧‧‧中間層
3‧‧‧熱膨脹性黏著層
4‧‧‧分隔件
Claims (3)
- 一種加熱剝離型黏著片,其特徵在於:於基材之單面或兩面設置含有熱膨脹性微球、著色劑之熱膨脹性黏著層,或於基材之單面或兩面經由著色中間層設置含有熱膨脹性微球之熱膨脹性黏著層,熱膨脹性黏著層中之著色劑之濃度相對於構成熱膨脹性黏著層之黏著劑基底聚合物100重量份為0.01~1.5重量份,且加熱剝離型黏著片之總光線穿透率為50%以上。
- 如請求項1之加熱剝離型黏著片,其係將上述加熱剝離型黏著片貼附於被加工物上,剝離後向被加工物之金屬轉印量藉由電感耦合電漿質量分析法獲得之測定值為1.0×1010atoms/cm2以下者。
- 如請求項1或2之加熱剝離型黏著片,其係將上述加熱剝離型黏著片貼附於被加工物上,於40℃之溫度下放置1天後,經加熱剝離時向被加工物之金屬轉印量藉由電感耦合電漿質量分析法獲得之測定值為1.0×1010atoms/cm2以下者。
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KR20130023272A (ko) | 2013-03-07 |
CN102959030A (zh) | 2013-03-06 |
US20130330546A1 (en) | 2013-12-12 |
JP2012184292A (ja) | 2012-09-27 |
KR101505259B1 (ko) | 2015-03-23 |
JP5689336B2 (ja) | 2015-03-25 |
CN102959030B (zh) | 2015-05-27 |
EP2682442A1 (en) | 2014-01-08 |
TW201243014A (en) | 2012-11-01 |
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