TWI756783B - 負型感光性樹脂組合物、與使用其之聚醯亞胺及硬化浮凸圖案之製造方法 - Google Patents
負型感光性樹脂組合物、與使用其之聚醯亞胺及硬化浮凸圖案之製造方法 Download PDFInfo
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- TWI756783B TWI756783B TW109128080A TW109128080A TWI756783B TW I756783 B TWI756783 B TW I756783B TW 109128080 A TW109128080 A TW 109128080A TW 109128080 A TW109128080 A TW 109128080A TW I756783 B TWI756783 B TW I756783B
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- compound
- photosensitive resin
- resin composition
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- negative photosensitive
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- JBYXACURRYATNJ-UHFFFAOYSA-N trimethoxy(1-trimethoxysilylhexyl)silane Chemical compound CCCCCC([Si](OC)(OC)OC)[Si](OC)(OC)OC JBYXACURRYATNJ-UHFFFAOYSA-N 0.000 description 1
- XVZMLSWFBPLMEA-UHFFFAOYSA-N trimethoxy(2-pyridin-2-ylethyl)silane Chemical compound CO[Si](OC)(OC)CCC1=CC=CC=N1 XVZMLSWFBPLMEA-UHFFFAOYSA-N 0.000 description 1
- ZNOCGWVLWPVKAO-UHFFFAOYSA-N trimethoxy(phenyl)silane Chemical compound CO[Si](OC)(OC)C1=CC=CC=C1 ZNOCGWVLWPVKAO-UHFFFAOYSA-N 0.000 description 1
- XQEGZYAXBCFSBS-UHFFFAOYSA-N trimethoxy-(4-methylphenyl)silane Chemical compound CO[Si](OC)(OC)C1=CC=C(C)C=C1 XQEGZYAXBCFSBS-UHFFFAOYSA-N 0.000 description 1
- YUYCVXFAYWRXLS-UHFFFAOYSA-N trimethoxysilane Chemical compound CO[SiH](OC)OC YUYCVXFAYWRXLS-UHFFFAOYSA-N 0.000 description 1
- QJOOZNCPHALTKK-UHFFFAOYSA-N trimethoxysilylmethanethiol Chemical compound CO[Si](CS)(OC)OC QJOOZNCPHALTKK-UHFFFAOYSA-N 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
- 229940116269 uric acid Drugs 0.000 description 1
- 229940075420 xanthine Drugs 0.000 description 1
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- C07C275/10—Derivatives of urea, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups having nitrogen atoms of urea groups bound to acyclic carbon atoms of an acyclic and saturated carbon skeleton being further substituted by singly-bound oxygen atoms
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Abstract
本發明提供一種可獲得高耐化學品性及解像度且於高溫保存試驗後可於Cu層之與樹脂層相接之界面抑制孔隙之產生的負型感光性樹脂組合物、及使用其之硬化浮凸圖案之形成方法。本發明提供一種負型感光性樹脂組合物,其包含:(A)以下之通式(1)所表示之聚醯亞胺前驅物;(B)包含選自胺基甲酸酯鍵、及脲鍵中之至少1種之化合物;以及(C)光聚合起始劑。式中,X1
、Y1
、n1
、R1
及R2
分別於本案說明書中進行定義。
Description
本發明係關於一種負型感光性樹脂組合物、與使用其之聚醯亞胺及硬化浮凸圖案之製造方法。
先前,於電子零件之絕緣材料、及半導體裝置之鈍化膜、表面保護膜、層間絕緣膜等中使用同時具有優異之耐熱性、電氣特性及機械特性之聚醯亞胺樹脂、聚苯并㗁唑樹脂、酚系樹脂等。該等樹脂之中,以感光性樹脂組合物之形態提供者藉由該組合物之塗佈、曝光、顯影、及利用硬化之熱醯亞胺化處理可容易地形成耐熱性之浮凸圖案皮膜。此種感光性樹脂組合物具有與先前之非感光型材料相比能夠實現大幅度之步驟縮短之特徵。
另外,半導體裝置(以下亦稱為「元件」)係對應目的而以各種方法安裝於印刷基板。先前之元件通常藉由自元件之外部端子(焊墊)至引線框架利用較細之導線進行連接之打線接合法而製作。然而,近年來元件之高速化推進,動作頻率達至GHz,故而安裝中之各端子之配線長度之差異對元件之動作產生影響。因此,於高端用途之元件之安裝中,需要正確地控制安裝配線之長度,藉由打線接合難以滿足其要求。
因此,提出於半導體晶片之表面形成再配線層,於其上形成凸塊(電極)後,將該晶片翻轉而直接安裝於印刷基板之覆晶安裝(例如參照專利文獻1)。於該覆晶安裝中,由於可正確地控制配線距離而被採用於處理高速之信號之高端用途之元件、或由於安裝尺寸較小而被採用於行動電話等,需求急速擴大。於在覆晶安裝中使用聚醯亞胺、聚苯并㗁唑、酚系樹脂等材料之情形時,形成該樹脂層之圖案後,經過金屬配線層形成步驟。金屬配線層通常藉由如下方式形成:對樹脂層表面進行電漿蝕刻使表面粗化後,藉由濺鍍以1 μm以下之厚度形成成為鍍覆之晶種層之金屬層,以該金屬層作為電極進行電解鍍覆。此時,通常作為成為晶種層之金屬使用鈦(Ti),作為藉由電解鍍覆所形成之再配線層之金屬使用銅(Cu)。
關於此種金屬再配線層,要求於可靠性試驗後再配線之金屬層與樹脂層之密接性較高。作為可靠性試驗,例如可列舉:於空氣中以125℃以上之高溫保存100小時以上之高溫保存試驗;一面組入配線施加電壓,一面確認於空氣中以125℃左右之溫度經過100小時以上之保存下之動作之高溫動作試驗;於空氣中循環往復-65℃~-40℃左右之低溫狀態與125℃~150℃左右之高溫狀態之溫度循環試驗;以85℃以上之溫度於濕度85%以上之水蒸氣環境下進行保存之高溫高濕保存試驗;一面組入配線施加電壓,一面進行與高溫高濕保存試驗相同之試驗之高溫高濕偏壓試驗;以及於空氣中或氮氣下複數次通過260℃之回焊爐之回焊試驗等。
[先前技術文獻]
[專利文獻]
[專利文獻1]日本專利特開2001-338947號公報
[發明所欲解決之問題]
然而,先前於上述可靠性試驗中之高溫保存試驗之情形時,存在於試驗後再配線之Cu層之與樹脂層相接之界面產生孔隙之問題。若於Cu層與樹脂層之界面產生孔隙,則兩者之密接性降低。
除了孔隙之問題以外,還對金屬再配線層要求耐化學品性,又,微細化要求亦變大。因此,尤其對半導體之再配線層之形成中使用之感光性樹脂組合物要求抑制孔隙之產生並且顯示高耐化學品性與解像性。
本發明係鑒於上述先前之實際情況而想出者,其目的之一在於提供一種可獲得高耐化學品性及解像度,且於高溫保存(high temperature storage)試驗後可於Cu層之與樹脂層相接之界面抑制孔隙之產生之負型感光性樹脂組合物(以下,於本案說明書中亦簡稱為「感光性樹脂組合物」)。又,其目的之一亦在於提供一種使用本發明之負型感光性樹脂組合物之硬化浮凸圖案之形成方法。
又,近年來扇出型半導體封裝體受到關注。於扇出型之半導體封裝體中,藉由以密封材覆蓋半導體晶片而形成大於半導體晶片之晶片尺寸之晶片密封體。進而,形成達至半導體晶片及密封材之區域之再配線層。再配線層係以較薄之膜厚形成。又,由於再配線層可形成至密封材之區域,故而可增多外部連接端子之個數。扇出型半導體封裝體必需硬化溫度之進一步低溫化,其結果,與塑模樹脂等密封材之密接性降低,故而必需進一步之改良。
[解決問題之技術手段]
本發明者等人發現藉由組合特定之結構之聚醯亞胺前驅物、具有特定之結構之(甲基)丙烯酸酯及光聚合起始劑,可解決上述課題,從而完成本發明。以下列舉本發明之實施形態之例。
[1]
一種負型感光性樹脂組合物,其包含:
(A)下述通式(1)所表示之聚醯亞胺前驅物;
(B)包含選自胺基甲酸酯鍵、及脲鍵中之至少1種之化合物;以及
(C)光聚合起始劑。
[化1]
{式中,X1
為4價之有機基,Y1
為2價之有機基,n1
為2~150之整數,並且R1
及R2
分別獨立為氫原子、或1價之有機基,R1
及R2
之至少一者為下述通式(2)所表示之1價之有機基}
[化2]
{式中,L1
、L2
及L3
分別獨立為氫原子或碳數1~3之有機基,並且m1
為2~10之整數}
[2]
如項目1中記載之負型感光性樹脂組合物,其中上述(B)化合物為具有脲鍵之化合物。
[3]
如項目1或2中記載之負型感光性樹脂組合物,其中上述(B)化合物進而包含選自(甲基)丙烯醯基、羥基、烷氧基、及胺基中之至少1種官能基。
[4]
如項目1至3中任一項記載之負型感光性樹脂組合物,其中上述(B)化合物為具有(甲基)丙烯醯基及脲鍵之化合物,且(甲基)丙烯醯基當量為150~400 g/mol。
[5]
如項目1至3中任一項記載之負型感光性樹脂組合物,其中上述(B)化合物為具有(甲基)丙烯醯基及脲鍵之化合物,且(甲基)丙烯醯基當量為210~400 g/mol。
[6]
如項目1至3中任一項記載之負型感光性樹脂組合物,其中上述(B)化合物為具有(甲基)丙烯醯基及脲鍵之化合物,且(甲基)丙烯醯基當量為220~400 g/mol。
[7]
如項目1至6中任一項記載之負型感光性樹脂組合物,其中上述(B)化合物具有下述通式(3)所表示之結構。
[化3]
{式中,R3
為氫原子或甲基,A為選自由-O-、-NH-、及-NL4
-所組成之群中之一個基,L4
為碳數1~12之1價之有機基,Z1
為碳數2~24之m2
價之有機基,Z2
為碳數2~8之2價之有機基,並且m2
為1~3之整數}
[8]
如項目1至7中任一項記載之負型感光性樹脂組合物,其中上述(B)化合物進而包含(甲基)丙烯醯基、及選自羥基、烷氧基、及胺基中之至少1種官能基。
[9]
如項目1至8中任一項記載之負型感光性樹脂組合物,其中上述(B)化合物為選自由下述式(4)~(7)、及(11)~(14)所組成之群中之至少1種化合物。
[化4]
[化5]
[化6]
[化7]
[化8]
[化9]
[化10]
[化11]
[10]
如項目1至9中任一項記載之負型感光性樹脂組合物,其進而包含(D)防銹劑。
[11]
如項目10中記載之負型感光性樹脂組合物,其中上述(D)防銹劑包含含氮雜環化合物。
[12]
如項目11中記載之負型感光性樹脂組合物,其中上述含氮雜環化合物為唑化合物。
[13]
如項目11中記載之負型感光性樹脂組合物,其中上述含氮雜環化合物為嘌呤衍生物。
[14]
如項目1至13中任一項記載之負型感光性樹脂組合物,其進而包含(E)矽烷偶合劑。
[15]
如項目1至14中任一項記載之負型感光性樹脂組合物,其中上述(A)聚醯亞胺前驅物中之X1包含選自由下述通式(20a)、(20b)及(20c)所組成之群中之至少1種。
[化12]
[化13]
[化14]
{式中,R6分別獨立為選自由氫原子、氟原子、C1
~C10
之烴基、及C1
~C10
之含氟烴基所組成之群中之1價之基,l為選自0~2中之整數,並且m為選自0~3中之整數}
[16]
如項目1至15中任一項記載之負型感光性樹脂組合物,其中上述(A)聚醯亞胺前驅物中之Y1包含選自由下述通式(21a)、(21b)及(21c)所組成之群中之至少1種。
[化15]
[化16]
[化17]
{式中,R6分別獨立為選自由氫原子、氟原子、C1
~C10
之烴基、及C1
~C10
之含氟烴基所組成之群中之1價之基,並且n為選自0~4中之整數}
[17]
如項目1至16中任一項記載之負型感光性樹脂組合物,其中上述(A)聚醯亞胺前驅物包含具有下述通式(8):
[化18]
{式中,n1
為2~150之整數,並且R1
及R2
分別獨立為氫原子、或1價之有機基}
所表示之結構單元之聚醯亞胺前驅物。
[18]
如項目1至17中任一項記載之負型感光性樹脂組合物,其中上述(A)聚醯亞胺前驅物包含具有下述通式(9):
[化19]
{式中,n1
為2~150之整數,並且R1
及R2
分別獨立為氫原子、或1價之有機基}
所表示之結構單元之聚醯亞胺前驅物。
[19]
如項目1至18中任一項記載之負型感光性樹脂組合物,其中上述(A)聚醯亞胺前驅物為下述通式(8):
[化20]
{式中,n1
為2~150之整數,並且R1
及R2
分別獨立為氫原子、或1價之有機基,與通式(9)中之R1
、R2
、及n1
相同或可不同}
所表示之結構單元、與
下述通式(9):
[化21]
{式中,n1
為2~150之整數,並且R1
及R2
分別獨立為氫原子、或1價之有機基,與通式(8)中之R1
、R2
、及n1
相同或可不同}
所表示之結構單元之共聚物,或者
為具有上述通式(8)所表示之結構單元之聚醯亞胺前驅物與具有上述通式(9)所表示之結構單元之聚醯亞胺前驅物之混合物。
[20]
如項目19中記載之負型感光性樹脂組合物,其中上述(A)聚醯亞胺前驅物為上述通式(8)所表示之結構單元與上述通式(9)所表示之結構單元之共聚物。
[21]
如項目1至20中任一項記載之負型感光性樹脂組合物,其包含:
100質量份之上述(A)聚醯亞胺前驅物、
以上述(A)聚醯亞胺前驅物100質量份為基準而為0.1~30質量份之上述(B)化合物、及
以上述(A)聚醯亞胺前驅物100質量份為基準而為0.1~20質量份之上述(C)光聚合起始劑。
[22]
一種聚醯亞胺之製造方法,其包含將如項目1至21中任一項記載之負型感光性樹脂組合物轉化為聚醯亞胺之步驟。
[23]
一種硬化浮凸圖案之製造方法,其包含:
(1)將如項目1至21中任一項記載之負型感光性樹脂組合物塗佈於基板上而於上述基板上形成感光性樹脂層之步驟、
(2)對上述感光性樹脂層進行曝光之步驟、
(3)對曝光後之上述感光性樹脂層進行顯影而形成浮凸圖案之步驟、及
(4)對上述浮凸圖案進行加熱處理而形成硬化浮凸圖案之步驟。
[24]
一種化合物,其係以下述式(5)表示。
[化22]
[25]
一種化合物,其係以下述式(6)表示。
[化23]
[26]
一種化合物,其係以下述式(7)表示。
[化24]
[27]
一種化合物,其係以下述式(11)表示。
[化25]
[28]
一種化合物,其係以下述式(12)表示。
[化26]
[29]
一種化合物,其係以下述式(13)表示。
[化27]
[30]
一種化合物,其係以下述式(14)表示。
[化28]
[發明之效果]
根據本發明,可提供一種可獲得高耐化學品性與解像度,且於高溫保存(high temperature storage)試驗後於Cu層之與樹脂層相接之界面抑制孔隙之產生之負型感光性樹脂組合物,又,可提供一種使用該負型感光性樹脂組合物之硬化浮凸圖案之形成方法。又,根據本發明,可提供一種與扇出型半導體封裝體中使用之塑模樹脂之密接性良好之負型感光性樹脂組合物。
以下,對用以實施本發明之形態(以下亦稱為「本實施形態」)進行詳細說明。再者,本發明並不限定於以下之本實施形態,可於其主旨之範圍內進行各種變化而實施。再者,本說明書通篇中,通式中相同符號所表示之結構於在分子中存在複數個之情形時,相互相同,或可不同。
<負型感光性樹脂組合物>
本實施形態之負型感光性樹脂組合物包含:(A)聚醯亞胺前驅物;(B)包含選自胺基甲酸酯鍵、及脲鍵中之至少1種之化合物;以及(C)光聚合起始劑。
就獲得高耐化學品性之觀點而言,負型感光性樹脂組合物較佳為包含:100質量份之(A)聚醯亞胺前驅物、以(A)聚醯亞胺前驅物100質量份為基準而為0.1~30質量份之(B)化合物、及以(A)聚醯亞胺前驅物100質量份為基準而為0.1~20質量份之(C)光聚合起始劑。
(A)聚醯亞胺前驅物
本實施形態中之(A)聚醯亞胺前驅物係負型感光性樹脂組合物中所含之樹脂成分,藉由實施加熱環化處理而轉化為聚醯亞胺。聚醯亞胺前驅物係具有下述通式(1)所表示之結構之聚醯胺。
[化29]
{式中,X1
為4價之有機基,Y1
為2價之有機基,n1
為2~150之整數,並且R1
及R2
分別獨立為氫原子、或1價之有機基}
通式(1)中之n1
只要為2~150之整數則並無限定,就負型感光性樹脂組合物之感光特性及機械特性之觀點而言,較佳為3~100之整數,更佳為5~70之整數。於通式(1)中,X1
所表示之4價之有機基就兼顧耐熱性與感光特性之方面而言,較佳為碳數6~40之有機基,更佳為-COOR1
基及-COOR2
基與-CONH-基相互位於鄰位之芳香族基、或脂環式脂肪族基。作為X1
所表示之4價之有機基,具體而言,可列舉含有芳香族環之碳原子數6~40之有機基、例如具有下述通式(20)所表示之結構之基,但並不限定於該等。
[化31]
{式中,R6為選自由氫原子、氟原子、C1
~C10
之烴基、及C1
~C10
之含氟烴基所組成之群中之1價之基,l為選自0~2中之整數,m為選自0~3中之整數,並且n為選自0~4中之整數}
X1
之結構可為1種,亦可為2種以上之組合。具有上述式(20)所表示之結構之X1
基就兼顧耐熱性與感光特性之方面而言尤佳。作為X1
基,上述式(20)所表示之結構之中尤其是下式(20a)、(20b)及(20c)所表示之結構就耐化學品性、解像度、及高溫保存試驗後之孔隙抑制之觀點而言尤佳。
[化32]
{式中,R6分別獨立為選自由氫原子、氟原子、C1
~C10
之烴基、及C1
~C10
之含氟烴基所組成之群中之1價之基,l為選自0~2中之整數,m為選自0~3中之整數,並且n為選自0~4中之整數}通式(20a)~(20c)之R6
可分別與下述通式(21a)~(21c)之R6
相同,或亦可不同。
於上述通式(1)中,Y1
所表示之2價之有機基就兼顧耐熱性與感光特性之方面而言,較佳為碳數6~40之芳香族基,例如可列舉下述式(21)所表示之結構,但並不限定於該等。
[化33]
{式中,R6為選自由氫原子、氟原子、C1
~C10
之烴基、及C1
~C10
之含氟烴基所組成之群中之1價之基,並且n為選自0~4中之整數}
Y1
之結構可為1種,亦可為2種以上之組合。具有上述式(21)所表示之結構之Y1
基就兼顧耐熱性及感光特性之方面而言尤佳。作為Y1
基,上述式(21)所表示之結構之中尤其是下式(21a)、(21b)及(21c)所表示之結構就耐化學品性、解像度、及高溫保存試驗後之孔隙抑制之觀點而言尤佳。
[化34]
{式中,R6分別獨立為選自由氫原子、氟原子、C1
~C10
之烴基、及C1
~C10
之含氟烴基所組成之群中之1價之基,並且n為選自0~4中之整數}通式(21a)~(21c)之R6
可分別與上述通式(20a)~(20c)之R6
相同,或亦可不同。
上述通式(2)中之L1
較佳為氫原子或甲基,L2
及L3
就感光特性之觀點而言較佳為氫原子。又,m1
就感光特性之觀點而言為2以上且10以下之整數、較佳為2以上且4以下之整數。
於一實施形態中,(A)聚醯亞胺前驅物較佳為具有下述通式(8):
[化35]
{式中,R1
、R2
、及n1
係上述所定義者}
所表示之結構單元之聚醯亞胺前驅物。於通式(8)中,R1
及R2
之至少一者更佳為上述通式(2)所表示之1價之有機基。藉由使(A)聚醯亞胺前驅物包含具有通式(8)所表示之結構單元之聚醯亞胺前驅物,尤其是解像性之效果提高。
於通式(9)中,R1
及R2
之至少一者更佳為上述通式(2)所表示之1價之有機基。藉由使(A)聚醯亞胺前驅物除包含具有通式(8)所表示之結構單元之聚醯亞胺前驅物以外,還包含具有通式(9)所表示之結構單元之聚醯亞胺前驅物,而尤其是解像性之效果進一步提高。
就耐化學品性、解像度、及高溫保存試驗後之孔隙抑制之觀點而言,尤佳為(A)聚醯亞胺前驅物為具有通式(8)所表示之結構單元之聚醯亞胺前驅物與具有通式(9)所表示之結構單元之聚醯亞胺前驅物之混合物,或者為上述通式(8)所表示之結構單元與上述通式(9)所表示之結構單元之共聚物。於通式(8)及(9)中,一個式中之R1
、R2
、及n1
可分別與另一個式中之R1
、R2
、及n1
相同,或亦可不同。
(A)聚醯亞胺前驅物之製備方法
聚醯亞胺前驅物可藉由如下方式獲得:首先,使包含上述4價之有機基X1
之四羧酸二酐、與具有光聚合性之不飽和雙鍵之醇類及任意不具有不飽和雙鍵之醇類進行反應,製備部分酯化之四羧酸(以下亦稱為酸/酯體)後,使其與包含上述2價之有機基Y1
之二胺類進行醯胺縮聚。
(酸/酯體之製備)
於本實施形態中,作為較佳地用於製備(A)聚醯亞胺前驅物之包含4價之有機基X1
之四羧酸二酐,以上述通式(20)所示之四羧酸二酐為代表,例如可列舉:均苯四甲酸二酐、二苯醚-3,3',4,4'-四羧酸二酐、二苯甲酮-3,3',4,4'-四羧酸二酐、4,4'-氧二鄰苯二甲酸二酐(ODPA)、3,3',4,4'-聯苯四羧酸二酐(BPDA)、二苯基碸-3,3',4,4'-四羧酸二酐、二苯基甲烷-3,3',4,4'-四羧酸二酐、2,2-雙(3,4-鄰苯二甲酸酐)丙烷、2,2-雙(3,4-鄰苯二甲酸酐)-1,1,1,3,3,3-六氟丙烷等。較佳為可列舉均苯四甲酸二酐、二苯醚-3,3',4,4'-四羧酸二酐、二苯甲酮-3,3',4,4'-四羧酸二酐、4,4'-氧二鄰苯二甲酸二酐(ODPA)、3,3',4,4'-聯苯四羧酸二酐(BPDA),但並不限定於該等。又,該等可單獨使用,亦可混合2種以上而使用。
於本實施形態中,作為可適當地用於製備(A)聚醯亞胺前驅物之具有光聚合性之不飽和雙鍵之醇類,例如可列舉:甲基丙烯酸2-羥基乙酯(HEMA)、2-丙烯醯氧基乙醇、1-丙烯醯氧基-3-丙醇、2-丙烯醯胺乙醇、羥甲基乙烯基酮、2-羥基乙基乙烯基酮、丙烯酸2-羥基-3-甲氧基丙酯、丙烯酸2-羥基-3-丁氧基丙酯、丙烯酸2-羥基-3-苯氧基丙酯、丙烯酸2-羥基-3-丁氧基丙酯、丙烯酸2-羥基-3-第三丁氧基丙酯、丙烯酸2-羥基-3-環己氧基丙酯、2-甲基丙烯醯氧基乙醇、1-甲基丙烯醯氧基-3-丙醇、2-甲基丙烯醯胺乙醇、羥甲基乙烯基酮、甲基丙烯酸2-羥基-3-甲氧基丙酯、甲基丙烯酸2-羥基-3-丁氧基丙酯、甲基丙烯酸2-羥基-3-苯氧基丙酯、甲基丙烯酸2-羥基-3-丁氧基丙酯、甲基丙烯酸2-羥基-3-第三丁氧基丙酯、甲基丙烯酸2-羥基-3-環己氧基丙酯等。
亦可向上述具有光聚合性之不飽和雙鍵之醇類中部分混合例如甲醇、乙醇、正丙醇、異丙醇、正丁醇、第三丁醇、1-戊醇、2-戊醇、3-戊醇、新戊醇、1-庚醇、2-庚醇、3-庚醇、1-辛醇、2-辛醇、3-辛醇、1-壬醇、三乙二醇單甲醚、三乙二醇單乙醚、四乙二醇單甲醚、四乙二醇單乙醚、苄醇等不具有不飽和雙鍵之醇類而使用。
又,作為聚醯亞胺前驅物,亦可將僅以上述不具有不飽和雙鍵之醇類製備之非感光性聚醯亞胺前驅物與感光性聚醯亞胺前驅物混合而使用。就解像性之觀點而言,非感光性聚醯亞胺前驅物較佳為以感光性聚醯亞胺前驅物100質量份為基準而為200質量份以下。
將上述較佳之四羧酸二酐與上述醇類於吡啶等鹼性觸媒之存在下,於如下所述之溶劑中,以溫度20~50℃攪拌溶解4~10小時進行混合,藉此可進行酸酐之酯化反應,獲得所需之酸/酯體。
(聚醯亞胺前驅物之製備)
於冰冷下向上述酸/酯體(典型而言為下述溶劑中之溶液)中投入混合適當之脫水縮合劑、例如二環己基碳二醯亞胺、1-乙氧基羰基-2-乙氧基-1,2-二氫喹啉、1,1-羰基二氧基-二-1,2,3-苯并三唑、N,N'-二丁二醯亞胺基碳酸酯等而將酸/酯體製成聚酸酐後,向其中滴加投入於本實施形態中可適當使用之包含2價之有機基Y1
之二胺類另行溶解或分散於溶劑而成者,進行醯胺縮聚,藉此可獲得目標之聚醯亞胺前驅物。作為代替方案,針對上述酸/酯體,使用亞硫醯氯等將酸部分進行醯氯化後,於吡啶等鹼存在下與二胺化合物反應,藉此可獲得目標之聚醯亞胺前驅物。
作為於本實施形態中較佳地使用之包含2價之有機基Y1
之二胺類,以具有上述通式(21)所示之結構之二胺為代表,例如可列舉:對苯二胺、間苯二胺、4,4-二胺基二苯醚(4,4'-氧二苯胺(ODA))、3,4'-二胺基二苯醚、3,3'-二胺基二苯醚、4,4'-二胺基二苯基硫醚、3,4'-二胺基二苯基硫醚、3,3'-二胺基二苯基硫醚、4,4'-二胺基二苯基碸、3,4'-二胺基二苯基碸、3,3'-二胺基二苯基碸、4,4'-二胺基聯苯、3,4'-二胺基聯苯、3,3'-二胺基聯苯、4,4'-二胺基二苯甲酮、3,4'-二胺基二苯甲酮、3,3'-二胺基二苯甲酮、4,4'-二胺基二苯基甲烷、3,4'-二胺基二苯基甲烷、3,3'-二胺基二苯基甲烷、1,4-雙(4-胺基苯氧基)苯、1,3-雙(4-胺基苯氧基)苯、1,3-雙(3-胺基苯氧基)苯、雙[4-(4-胺基苯氧基)苯基]碸、雙[4-(3-胺基苯氧基)苯基]碸、4,4-雙(4-胺基苯氧基)聯苯、4,4-雙(3-胺基苯氧基)聯苯、雙[4-(4-胺基苯氧基)苯基]醚、雙[4-(3-胺基苯氧基)苯基]醚、1,4-雙(4-胺基苯基)苯、1,3-雙(4-胺基苯基)苯、9,10-雙(4-胺基苯基)蒽、2,2-雙(4-胺基苯基)丙烷、2,2-雙(4-胺基苯基)六氟丙烷、2,2-雙[4-(4-胺基苯氧基)苯基]丙烷、2,2-雙[4-(4-胺基苯氧基)苯基]六氟丙烷、1,4-雙(3-胺基丙基二甲基矽烷基)苯、鄰聯甲苯胺碸、9,9-雙(4-胺基苯基)茀、及該等之苯環上之氫原子之一部分經甲基、乙基、羥基甲基、羥基乙基、鹵素等取代而成者、例如3,3'-二甲基-4,4'-二胺基聯苯、2,2'-二甲基-4,4'-二胺基聯苯(2,2'-二甲基聯苯-4,4'-二胺(m-TB))、3,3'-二甲基-4,4'-二胺基二苯基甲烷、2,2'-二甲基-4,4'-二胺基二苯基甲烷、3,3'-二甲氧基-4,4'-二胺基聯苯、3,3'-二氯-4,4'-二胺基聯苯、及其混合物等,但並不限定於其。
於醯胺縮聚反應結束後,將該反應液中共存之脫水縮合劑之吸水副產物視需要過濾分離後,將水、脂肪族低級醇、或其混合液等不良溶劑投入至所得之聚合物成分中,析出聚合物成分,進而反覆進行再溶解、再沈澱析出操作等,藉此將聚合物純化,並進行真空乾燥,單離目標之聚醯亞胺前驅物。為了提高純化度,亦可使該聚合物之溶液通過將陰離子及/或陽離子交換樹脂以適當之有機溶劑膨潤後進行填充之管柱而去除離子性雜質。
上述(A)聚醯亞胺前驅物之分子量於以利用凝膠滲透層析法獲得之聚苯乙烯換算重量平均分子量進行測定之情形時,較佳為8,000~150,000,更佳為9,000~50,000。於重量平均分子量為8,000以上之情形時,機械物性良好,於為150,000以下之情形時,於顯影液中之分散性良好,浮凸圖案之解像性能良好。作為凝膠滲透層析法之展開溶劑,推薦四氫呋喃、及N-甲基-2-吡咯啶酮。又,重量平均分子量係由使用標準單分散聚苯乙烯所製成之校準曲線求出。作為標準單分散聚苯乙烯,推薦自昭和電工公司製造之有機溶劑系標準試樣STANDARD SM-105中進行選擇。
(B)具有胺基甲酸酯鍵、或脲鍵之化合物
本實施形態中使用之(B)化合物於分子結構中包含選自胺基甲酸酯鍵、及脲鍵中之至少1種(以下於本實施形態中亦稱為「胺基甲酸酯/脲化合物」)。本實施形態中使用之化合物只要於分子結構中具有胺基甲酸酯鍵及/或脲鍵,則其他結構並無限定。其中,就Cu表面孔隙抑制或耐化學品性之觀點而言,較佳為具有脲鍵。於本實施形態中,(B)化合物較佳為進而具有選自由(甲基)丙烯醯基、羥基、烷氧基、及胺基所組成之群中之至少1種官能基。
藉由含有本實施形態之(B)化合物,耐化學品性或解像性較佳,關於其理由並未明確,但本發明者等人認為如下。即,於一態樣中,負型感光性樹脂組合物於180℃以下之較低溫度下加熱硬化,故而存在聚醯亞胺前驅物向聚醯亞胺之轉化並不充分之傾向。另一方面,認為本實施形態之負型感光性樹脂組合物藉由含有胺基甲酸酯/脲化合物(B),因(B)化合物之一部分發生熱分解而產生胺等,該胺等促進聚醯亞胺前驅物向聚醯亞胺之轉化。並且,認為於較佳之態樣中,藉由使化合物(B)進而具有(甲基)丙烯醯基,尤其於製成負型感光性樹脂組合物之情形時,藉由光照射,化合物(B)與聚醯亞胺前驅物之側鏈部分反應而進行交聯,藉此更容易存在於聚醯亞胺前驅物之附近,可飛躍性地提高轉化效率。
於本實施形態中,於(B)化合物進而具有(甲基)丙烯醯基之情形時,(B)化合物之(甲基)丙烯醯基當量較佳為150~400 g/mol。藉由使(B)化合物之(甲基)丙烯醯基當量為150 g/mol以上,存在負型感光性樹脂組合物之耐化學品性變得良好之傾向,藉由為400 g/mol以下,存在顯影性變得良好之傾向。(B)化合物之(甲基)丙烯醯基當量之下限值更佳為200 g/mol以上、210 g/mol以上、220 g/mol以上、230 g/mol以上、進而較佳為240 g/mol以上、250 g/mol以上,下限值更佳為350 g/mol以下、330 g/mol以下、進而較佳為300 g/mol以下。(B)化合物之(甲基)丙烯醯基當量進而更佳為210~400 g/mol、尤佳為220~400 g/mol。
本實施形態中使用之胺基甲酸酯/脲化合物(B)較佳為具有下述通式(3)所表示之結構之含有(甲基)丙烯醯基之胺基甲酸酯/脲化合物。
[化37]
{式中,R3
為氫原子或甲基,A為選自由-O-、-NH-、及-NL4
-所組成之群中之一個基,L4
為碳數1~12之1價之有機基,Z1
為碳數2~24之m2
價之有機基,Z2
為碳數2~8之2價之有機基,並且m2
為1~3之整數}
R3
只要為氫原子或甲基則並無限定,就顯影性之觀點而言,較佳為甲基。Z1
只要為碳數2~20之m2
價之有機基則並無限定。此處,Z1
亦可包含氧原子、硫原子、氮原子、磷原子等雜原子。若Z1
之碳數為2以上,則存在負型感光性樹脂組合物之耐化學品性良好之傾向,若碳數為20以下,則存在顯影性良好之傾向。Z1
之碳數較佳為3以上,更佳為4以上,且較佳為18以下,更佳為16以下。Z2
只要為碳數2~8之2價之有機基則並無限定。此處,Z2
亦可包含氧原子、硫原子、氮原子、磷原子等雜原子。若Z2
之碳數為2以上,則存在負型感光性樹脂組合物之耐化學品性良好之傾向,若碳數為8以下,則存在耐熱性良好之傾向。Z2
之碳數較佳為6以下,更佳為4以下。A為選自由-O-、-NH-、及-NL4
-所組成之群中之一個基。就耐化學品性之觀點而言,A較佳為-NH-或-NL4
-。
於上述所說明之(B)化合物之中,就耐化學品性、孔隙抑制、及顯影性之觀點而言,尤佳為選自由下述式(4)~(7)、及(11)~(14)所組成之群中之至少1種化合物。再者,下述式(4)~(7)、及(11)~(14)所表示之化合物亦為本發明之一實施形態。
[化39]
[化40]
[化41]
[化42]
[化43]
[化44]
[化45]
[化46]
本實施形態之胺基甲酸酯/脲化合物(B)較佳為進而具有選自由羥基、烷氧基、及胺基所組成之群中之至少1種官能基。本實施形態之胺基甲酸酯/脲化合物藉由含有選自由羥基、烷氧基、及胺基所組成之群中之至少1種,存在例如與作為一態樣之扇出型半導體封裝體中使用之塑模樹脂之密接性變得良好之傾向。關於其理由並未明確,但本發明者等人認為如下。即,於一態樣中,負型感光性樹脂組合物於180℃以下之較低之溫度下加熱硬化。若為上述較低之溫度,則扇出型半導體封裝體中使用之塑模樹脂中所含之環氧樹脂未部分開環而具有環氧結構,該環氧結構存在與胺基甲酸酯/脲化合物(B)中所含之羥基、烷氧基、胺基等相互作用之傾向。另一方面,推定藉由使化合物(B)中所含之胺基甲酸酯/脲結構與聚醯亞胺樹脂相互作用,表現出與塑模樹脂之較高之密接性。該等官能基之中,較佳為羥基、烷氧基,尤佳為羥基。就與塑模樹脂之密接性、耐化學品性、及Cu孔隙抑制之觀點而言,化合物(B)更佳為除了胺基甲酸酯/脲結構以外,還於分子結構中具有(甲基)丙烯醯基與羥基。
本實施形態中之(B)化合物可單獨使用1種,或亦可混合2種以上而使用。(B)化合物之調配量相對於(A)聚醯亞胺前驅物100質量份,較佳為0.1質量份以上且30質量份,更佳為1質量份以上且20質量份以下。關於上述(B)之調配量,就光感度或圖案化性之觀點而言為0.1質量份以上,就負型感光性樹脂組合物之硬化後之感光性樹脂層之物性之觀點而言為30質量份以下。
(C)光聚合起始劑
作為光聚合起始劑,較佳為光自由基聚合起始劑。作為光自由基聚合起始劑,可列舉:二苯甲酮、鄰苯甲醯基苯甲酸甲酯、4-苯甲醯基-4'-甲基二苯基酮、二苄基酮、及茀酮等二苯甲酮衍生物;2,2'-二乙氧基苯乙酮、2-羥基-2-甲基苯丙酮、及1-羥基環己基苯基酮等苯乙酮衍生物;9-氧硫、2-甲基-9-氧硫、2-異丙基-9-氧硫、二乙基-9-氧硫𠮿等9-氧硫𠮿衍生物;苯偶醯、苯偶醯二甲基縮酮、及苯偶醯-β-甲氧基乙基縮醛等苯偶醯衍生物;安息香、及安息香甲醚等安息香衍生物;1-苯基-1,2-丁二酮-2-(o-甲氧基羰基)肟、1-苯基-1,2-丙二酮-2-(o-甲氧基羰基)肟、1-苯基-1,2-丙二酮-2-(o-乙氧基羰基)肟、1-苯基-1,2-丙二酮-2-(o-苯甲醯基)肟、1,3-二苯基丙三酮-2-(o-乙氧基羰基)肟、及1-苯基-3-乙氧基丙三酮-2-(o-苯甲醯基)肟等肟類;N-苯基甘胺酸等N-芳基甘胺酸類;全氯苯甲醯等過氧化物類;芳香族聯咪唑類;二茂鈦類;以及α-(正辛烷磺醯氧基亞胺基)-4-甲氧基苄基氰化物等光酸產生劑類等,但並不限定於該等。於上述光聚合起始劑之中,尤其就光感度之方面而言,更佳為肟類。
(C)光聚合起始劑之調配量相對於(A)聚醯亞胺前驅物100質量份,較佳為0.1質量份以上且20質量份,更佳為1質量份以上且8質量份以下。關於上述調配量,就光感度或圖案化性之觀點而言為0.1質量份以上,就負型感光性樹脂組合物之硬化後之感光性樹脂層之物性之觀點而言為20質量份以下。
(D)防銹劑
本實施形態之負型感光性樹脂組合物可進而包含防銹劑。作為防銹劑,只要可對金屬進行防銹則並無限定,可列舉含氮雜環化合物。作為含氮雜環化合物,可列舉唑化合物、及嘌呤衍生物等。
作為唑化合物,可列舉:1H-三唑、5-甲基-1H-三唑、5-乙基-1H-三唑、4,5-二甲基-1H-三唑、5-苯基-1H-三唑、4-第三丁基-5-苯基-1H-三唑、5-羥基苯基-1H-三唑、苯基三唑、對乙氧基苯基三唑、5-苯基-1-(2-二甲胺基乙基)三唑、5-苄基-1H-三唑、羥基苯基三唑、1,5-二甲基三唑、4,5-二乙基-1H-三唑、1H-苯并三唑、2-(5-甲基-2-羥基苯基)苯并三唑、2-[2-羥基-3,5-雙(α,α-二甲基苄基)苯基]-苯并三唑、2-(3,5-二-第三丁基-2-羥基苯基)苯并三唑、2-(3-第三丁基-5-甲基-2-羥基苯基)-苯并三唑、2-(3,5-二-第三戊基-2-羥基苯基)苯并三唑、2-(2'-羥基-5'-第三辛基苯基)苯并三唑、羥基苯基苯并三唑、甲苯基三唑、5-甲基-1H-苯并三唑、4-甲基-1H-苯并三唑、4-羧基-1H-苯并三唑、5-羧基-1H-苯并三唑、1H-四唑、5-甲基-1H-四唑、5-苯基-1H-四唑、5-胺基-1H-四唑、及1-甲基-1H-四唑等。
作為唑化合物,尤佳為列舉甲苯基三唑、5-甲基-1H-苯并三唑、及4-甲基-1H-苯并三唑。又,該等唑化合物可單獨使用1種,亦可混合2種以上使用。
作為嘌呤衍生物,可列舉:嘌呤、腺嘌呤、鳥嘌呤、次黃嘌呤、黃嘌呤、可可鹼、咖啡因、尿酸、異鳥嘌呤、2,6-二胺基嘌呤、9-甲基腺嘌呤、2-羥基腺嘌呤、2-甲基腺嘌呤、1-甲基腺嘌呤、N-甲基腺嘌呤、N,N-二甲基腺嘌呤、2-氟腺嘌呤、9-(2-羥基乙基)腺嘌呤、鳥嘌呤肟、N-(2-羥基乙基)腺嘌呤、8-胺基腺嘌呤、6-胺基-8-苯基-9H-嘌呤、1-乙基腺嘌呤、6-乙基胺基嘌呤、1-苄基腺嘌呤、N-甲基鳥嘌呤、7-(2-羥基乙基)鳥嘌呤、N-(3-氯苯基)鳥嘌呤、N-(3-乙基苯基)鳥嘌呤、2-氮雜腺嘌呤、5-氮雜腺嘌呤、8-氮雜腺嘌呤、8-氮雜鳥嘌呤、8-氮雜嘌呤、8-氮雜黃嘌呤、及8-氮雜次黃嘌呤等、以及該等之衍生物。
於負型感光性樹脂組合物含有唑化合物或嘌呤衍生物之情形時,其調配量較佳為相對於(A)聚醯亞胺前驅物100質量份為0.05~5質量份,就光感度特性之觀點而言,更佳為0.1~5質量份。於唑化合物相對於(A)聚醯亞胺前驅物100質量份之調配量為0.05質量份以上之情形時,在銅或銅合金上形成本實施形態之負型感光性樹脂組合物之情形時抑制銅或銅合金表面之變色,另一方面,於唑化合物為5質量份以下之情形時,光感度優異。
於本實施形態之負型感光性樹脂組合物包含(D)防銹劑之情形時,尤其是抑制Cu層之孔隙形成。起到效果之理由並未明確,但認為其原因在於,存在於Cu表面之防銹劑、與胺基甲酸酯/脲化合物之較佳之實施態樣中所含之(甲基)丙烯醯基、羥基、烷氧基、或胺基相互作用,於Cu界面附近形成緻密之層。
(E)矽烷偶合劑
本實施形態之負型感光性樹脂組合物可進而包含矽烷偶合劑。作為矽烷偶合劑,可列舉:γ-胺基丙基二甲氧基矽烷、N-(β-胺基乙基)-γ-胺基丙基甲基二甲氧基矽烷、γ-縮水甘油氧基丙基甲基二甲氧基矽烷、γ-巰基丙基甲基二甲氧基矽烷、3-甲基丙烯醯氧基丙基二甲氧基甲基矽烷、3-甲基丙烯醯氧基丙基三甲氧基矽烷、二甲氧基甲基-3-哌啶基丙基矽烷、二乙氧基-3-縮水甘油氧基丙基甲基矽烷、N-(3-二乙氧基甲基矽烷基丙基)丁二醯亞胺、N-[3-(三乙氧基矽烷基)丙基]鄰苯二甲醯胺酸、二苯甲酮-3,3'-雙(N-[3-三乙氧基矽烷基]丙基醯胺)-4,4'-二羧酸、苯-1,4-雙(N-[3-三乙氧基矽烷基]丙基醯胺)-2,5-二羧酸、3-(三乙氧基矽烷基)丙基丁二酸酐、N-苯基胺基丙基三甲氧基矽烷、3-脲基丙基三甲氧基矽烷、3-脲基丙基三乙氧基矽烷、及3-(三烷氧基矽烷基)丙基丁二酸酐等矽烷偶合劑。
作為矽烷偶合劑,更具體而言,可列舉:3-巰基丙基三甲氧基矽烷(信越化學工業股份有限公司製造:商品名KBM803、Chisso股份有限公司製造:商品名Sila-Ace S810)、3-巰基丙基三乙氧基矽烷(Azmax股份有限公司製造:商品名SIM6475.0)、3-巰基丙基甲基二甲氧基矽烷(信越化學工業股份有限公司製造:商品名LS1375、Azmax股份有限公司製造:商品名SIM6474.0)、巰基甲基三甲氧基矽烷(Azmax股份有限公司製造:商品名SIM6473.5C)、巰基甲基甲基二甲氧基矽烷(Azmax股份有限公司製造:商品名SIM6473.0)、3-巰基丙基二乙氧基甲氧基矽烷、3-巰基丙基乙氧基二甲氧基矽烷、3-巰基丙基三丙氧基矽烷、3-巰基丙基二乙氧基丙氧基矽烷、3-巰基丙基乙氧基二丙氧基矽烷、3-巰基丙基二甲氧基丙氧基矽烷、3-巰基丙基甲氧基二丙氧基矽烷、2-巰基乙基三甲氧基矽烷、2-巰基乙基二乙氧基甲氧基矽烷、2-巰基乙基乙氧基二甲氧基矽烷、2-巰基乙基三丙氧基矽烷、2-巰基乙基三丙氧基矽烷、2-巰基乙基乙氧基二丙氧基矽烷、2-巰基乙基二甲氧基丙氧基矽烷、2-巰基乙基甲氧基二丙氧基矽烷、4-巰基丁基三甲氧基矽烷、4-巰基丁基三乙氧基矽烷、4-巰基丁基三丙氧基矽烷、N-(3-三乙氧基矽烷基丙基)脲(信越化學工業股份有限公司製造:商品名LS3610、Azmax股份有限公司製造:商品名SIU9055.0)、N-(3-三甲氧基矽烷基丙基)脲(Azmax股份有限公司製造:商品名SIU9058.0)、N-(3-二乙氧基甲氧基矽烷基丙基)脲、N-(3-乙氧基二甲氧基矽烷基丙基)脲、N-(3-三丙氧基矽烷基丙基)脲、N-(3-二乙氧基丙氧基矽烷基丙基)脲、N-(3-乙氧基二丙氧基矽烷基丙基)脲、N-(3-二甲氧基丙氧基矽烷基丙基)脲、N-(3-甲氧基二丙氧基矽烷基丙基)脲、N-(3-三甲氧基矽烷基乙基)脲、N-(3-乙氧基二甲氧基矽烷基乙基)脲、N-(3-三丙氧基矽烷基乙基)脲、N-(3-三丙氧基矽烷基乙基)脲、N-(3-乙氧基二丙氧基矽烷基乙基)脲、N-(3-二甲氧基丙氧基矽烷基乙基)脲、N-(3-甲氧基二丙氧基矽烷基乙基)脲、N-(3-三甲氧基矽烷基丁基)脲、N-(3-三乙氧基矽烷基丁基)脲、N-(3-三丙氧基矽烷基丁基)脲、3-(間胺基苯氧基)丙基三甲氧基矽烷(Azmax股份有限公司製造:商品名SLA0598.0)、間胺基苯基三甲氧基矽烷(Azmax股份有限公司製造:商品名SLA0599.0)、對胺基苯基三甲氧基矽烷(Azmax股份有限公司製造:商品名SLA0599.1)、胺基苯基三甲氧基矽烷(Azmax股份有限公司製造:商品名SLA0599.2)、2-(三甲氧基矽烷基乙基)吡啶(Azmax股份有限公司製造:商品名SIT8396.0)、2-(三乙氧基矽烷基乙基)吡啶、2-(二甲氧基矽烷基甲基乙基)吡啶、2-(二乙氧基矽烷基甲基乙基)吡啶、(3-三乙氧基矽烷基丙基)-第三丁基胺基甲酸酯、(3-縮水甘油氧基丙基)三乙氧基矽烷、四甲氧基矽烷、四乙氧基矽烷、四-正丙氧基矽烷、四-異丙氧基矽烷、四-正丁氧基矽烷、四-異丁氧基矽烷、四-第三丁氧基矽烷、四(甲氧基乙氧基矽烷)、四(甲氧基-正丙氧基矽烷)、四(乙氧基乙氧基矽烷)、四(甲氧基乙氧基乙氧基矽烷)、雙(三甲氧基矽烷基)乙烷、雙(三甲氧基矽烷基)己烷、雙(三乙氧基矽烷基)甲烷、雙(三乙氧基矽烷基)乙烷、雙(三乙氧基矽烷基)乙烯、雙(三乙氧基矽烷基)辛烷、雙(三乙氧基矽烷基)辛二烯、雙[3-(三乙氧基矽烷基)丙基]二硫醚、雙[3-(三乙氧基矽烷基)丙基]四硫醚、二-第三丁氧基二乙醯氧基矽烷、二-異丁氧基鋁氧基三乙氧基矽烷、苯基矽烷三醇、甲基苯基矽烷二醇、乙基苯基矽烷二醇、正丙基苯基矽烷二醇、異丙基苯基矽烷二醇、正丁基苯基矽烷二醇、異丁基苯基矽烷二醇、第三丁基苯基矽烷二醇、二苯基矽烷二醇、二甲氧基二苯基矽烷、二乙氧基二苯基矽烷、二甲氧基二-對甲苯基矽烷、乙基甲基苯基矽烷醇、正丙基甲基苯基矽烷醇、異丙基甲基苯基矽烷醇、正丁基甲基苯基矽烷醇、異丁基甲基苯基矽烷醇、第三丁基甲基苯基矽烷醇、乙基正丙基苯基矽烷醇、乙基異丙基苯基矽烷醇、正丁基乙基苯基矽烷醇、異丁基乙基苯基矽烷醇、第三丁基乙基苯基矽烷醇、甲基二苯基矽烷醇、乙基二苯基矽烷醇、正丙基二苯基矽烷醇、異丙基二苯基矽烷醇、正丁基二苯基矽烷醇、異丁基二苯基矽烷醇、第三丁基二苯基矽烷醇、及三苯基矽烷醇等,但並不限定於該等。該等可單獨使用一種,亦可組合複數種使用。
作為矽烷偶合劑,於上述矽烷偶合劑之中,就保存穩定性之觀點而言,較佳為苯基矽烷三醇、三甲氧基苯基矽烷、三甲氧基(對甲苯基)矽烷、二苯基矽烷二醇、二甲氧基二苯基矽烷、二乙氧基二苯基矽烷、二甲氧基二-對甲苯基矽烷、三苯基矽烷醇、及具有下述式所表示之結構之矽烷偶合劑。
[化50]
作為使用矽烷偶合劑之情形時之調配量,相對於(A)聚醯亞胺前驅物100質量份,較佳為0.1~20質量份。於本實施形態之負型感光性樹脂組合物包含(E)矽烷偶合劑之情形時,尤其是抑制Cu層之孔隙形成。起到效果之理由並未明確,但認為其原因在於:偏集存在於Cu表面之矽烷偶合劑與胺基甲酸酯/脲化合物之較佳之實施態樣中所含之(甲基)丙烯醯基、羥基、烷氧基、或胺基相互作用,於Cu界面附近形成緻密之層。
(F)其他成分
本實施形態之負型感光性樹脂組合物亦可進而含有上述(A)~(E)成分以外之成分。作為(A)~(E)成分以外之成分,並無限定,可列舉:溶劑、受阻酚化合物、有機鈦化合物、增感劑、光聚合性不飽和單體、熱聚合抑制劑等。
溶劑
作為溶劑,可列舉醯胺類、亞碸類、脲類、酮類、酯類、內酯類、醚類、鹵化烴類、烴類、及醇類等。更具體而言,例如可使用:N-甲基-2-吡咯啶酮、N-乙基-2-吡咯啶酮、N,N-二甲基乙醯胺、N,N-二甲基甲醯胺、二甲基亞碸、四甲基脲、丙酮、甲基乙基酮、甲基異丁基酮、環戊酮、環己酮、乙酸甲酯、乙酸乙酯、乙酸丁酯、草酸二乙酯、乳酸乙酯、乳酸甲酯、乳酸丁酯、γ-丁內酯、丙二醇單甲醚乙酸酯、丙二醇單甲醚、苄醇、苯乙二醇、四氫糠醇、乙二醇二甲醚、二乙二醇二甲醚、四氫呋喃、𠰌啉、二氯甲烷、1,2-二氯乙烷、1,4-二氯丁烷、氯苯、鄰二氯苯、苯甲醚、己烷、庚烷、苯、甲苯、二甲苯、均三甲苯等。其中,就樹脂之溶解性、樹脂組合物之穩定性、及對基板之接著性之觀點而言,較佳為N-甲基-2-吡咯啶酮、二甲基亞碸、四甲基脲、乙酸丁酯、乳酸乙酯、γ-丁內酯、丙二醇單甲醚乙酸酯、丙二醇單甲醚、二乙二醇二甲醚、苄醇、苯乙二醇、及四氫糠醇。
於上述溶劑之中,尤佳為完全溶解生成聚合物者,例如可列舉:N-甲基-2-吡咯啶酮、N-乙基-2-吡咯啶酮、N,N-二甲基乙醯胺、N,N-二甲基甲醯胺、二甲基亞碸、四甲基脲、及γ-丁內酯等。
於本實施形態之負型感光性樹脂組合物中,溶劑之使用量相對於(A)聚醯亞胺前驅物100質量份,較佳為100~1000質量份,更佳為120~700質量份,進而較佳為125~500質量份之範圍。
受阻酚化合物
為了抑制銅表面上之變色,負型感光性樹脂組合物可任意地包含受阻酚化合物。作為受阻酚化合物,可列舉:2,6-二-第三丁基-4-甲基苯酚、2,5-二-第三丁基-對苯二酚、3-(3,5-二-第三丁基-4-羥基苯基)丙酸十八烷基酯、3-(3,5-二-第三丁基-4-羥基苯基)丙酸異辛酯、4、4'-亞甲基雙(2,6-二-第三丁基苯酚)、4,4'-硫基-雙(3-甲基-6-第三丁基苯酚)、4,4'-亞丁基-雙(3-甲基-6-第三丁基苯酚)、三乙二醇-雙[3-(3-第三丁基-5-甲基-4-羥基苯基)丙酸酯]、1,6-己二醇-雙[3-(3,5-二-第三丁基-4-羥基苯基)丙酸酯]、2,2-硫基-二伸乙基雙[3-(3,5-二-第三丁基-4-羥基苯基)丙酸酯]、N,N'-六亞甲基雙(3,5-二-第三丁基-4-羥基-苯丙醯胺)、2,2'-亞甲基-雙(4-甲基-6-第三丁基苯酚)、2,2'-亞甲基-雙(4-乙基-6-第三丁基苯酚)、季戊四醇-四[3-(3,5-二-第三丁基-4-羥基苯基)丙酸酯]、異氰尿酸三-(3,5-二-第三丁基-4-羥基苄基)酯、1,3,5-三甲基-2,4,6-三(3,5-二-第三丁基-4-羥基苄基)苯、1,3,5-三(3-羥基-2,6-二甲基-4-異丙基苄基)-1,3,5-三𠯤-2,4,6-(1H,3H,5H)-三酮、1,3,5-三(4-第三丁基-3-羥基-2,6-二甲基苄基)-1,3,5-三𠯤-2,4,6-(1H,3H,5H)-三酮、1,3,5-三(4-第二丁基-3-羥基-2,6-二甲基苄基)-1,3,5-三𠯤-2,4,6-(1H,3H,5H)-三酮、1,3,5-三[4-(1-乙基丙基)-3-羥基-2,6-二甲基苄基]-1,3,5-三𠯤-2,4,6-(1H,3H,5H)-三酮、1,3,5-三[4-三乙基甲基-3-羥基-2,6-二甲基苄基]-1,3,5-三𠯤-2,4,6-(1H,3H,5H)-三酮、1,3,5-三(3-羥基-2,6-二甲基-4-苯基苄基)-1,3,5-三𠯤-2,4,6-(1H,3H,5H)-三酮、1,3,5-三(4-第三丁基-3-羥基-2,5,6-三甲基苄基)-1,3,5-三𠯤-2,4,6-(1H,3H,5H)-三酮、1,3,5-三(4-第三丁基-5-乙基-3-羥基-2,6-二甲基苄基)-1,3,5-三𠯤-2,4,6-(1H,3H,5H)-三酮、1,3,5-三(4-第三丁基-6-乙基-3-羥基-2-甲基苄基)-1,3,5-三𠯤-2,4,6-(1H,3H,5H)-三酮、1,3,5-三(4-第三丁基-6-乙基-3-羥基-2,5-二甲基苄基)-1,3,5-三𠯤-2,4,6-(1H,3H,5H)-三酮、1,3,5-三(4-第三丁基-5,6-二乙基-3-羥基-2-甲基苄基)-1,3,5-三𠯤-2,4,6-(1H,3H,5H)-三酮、1,3,5-三(4-第三丁基-3-羥基-2-甲基苄基)-1,3,5-三𠯤-2,4,6-(1H,3H,5H)-三酮、1,3,5-三(4-第三丁基-3-羥基-2,5-二甲基苄基)-1,3,5-三𠯤-2,4,6-(1H,3H,5H)-三酮、及1,3,5-三(4-第三丁基-5-乙基-3-羥基-2-甲基苄基)-1,3,5-三𠯤-2,4,6-(1H,3H,5H)-三酮等,但並不限定於其。該等之中,尤佳為1,3,5-三(4-第三丁基-3-羥基-2,6-二甲基苄基)-1,3,5-三𠯤-2,4,6-(1H,3H,5H)-三酮等。
受阻酚化合物之調配量較佳為相對於(A)聚醯亞胺前驅物100質量份為0.1~20質量份,就光感度特性之觀點而言,更佳為0.5~10質量份。於受阻酚化合物相對於(A)聚醯亞胺前驅物100質量份之調配量為0.1質量份以上之情形時,例如於銅或銅合金上形成本發明之感光性樹脂組合物之情形時,可防止銅或銅合金之變色、腐蝕,另一方面,於為20質量份以下之情形時,光感度優異。
有機鈦化合物
本實施形態之負型感光性樹脂組合物可含有有機鈦化合物。藉由含有有機鈦化合物,即便於在低溫下硬化之情形時,亦可形成耐化學品性優異之感光性樹脂層。
作為能夠使用之有機鈦化合物,可列舉於鈦原子上經由共價鍵或離子鍵鍵結有有機化學物質者。將有機鈦化合物之具體例示於以下之I)~VII):
I)鈦螯合物化合物:其中,就可獲得負型感光性樹脂組合物之保存穩定性及良好之圖案之方面而言,更佳為具有2個以上之烷氧基之鈦螯合物。具體例為雙(三乙醇胺)二異丙醇鈦、雙(2,4-戊二酸)二(正丁醇)鈦、雙(2,4-戊二酸)二異丙醇鈦、雙(四甲基庚二酸)二異丙醇鈦、雙(乙醯乙酸乙酯)二異丙醇鈦等。
II)四烷氧基鈦化合物:例如為四(正丁醇)鈦、四乙醇鈦、四(2-乙基己醇)鈦、四異丁醇鈦、四異丙醇鈦、四甲醇鈦、四甲氧基丙醇鈦、四甲基苯酚鈦、四(正壬醇)鈦、四(正丙醇)鈦、四硬脂醇鈦、四[雙{2,2-(烯丙氧基甲基)丁醇}]鈦等。
III)二茂鈦化合物:例如為(五甲基環戊二烯基)三甲醇鈦、雙(η5-2,4-環戊二烯-1-基)雙(2,6-二氟苯基)鈦、雙(η5-2,4-環戊二烯-1-基)雙(2,6-二氟-3-(1H-吡咯-1-基)苯基)鈦等。
IV)單烷氧基鈦化合物:例如為三(二辛基磷酸)異丙醇鈦、三(十二烷基苯磺酸)異丙醇鈦等。
V)氧化鈦化合物:例如為雙(戊二酸)氧化鈦、雙(四甲基庚二酸)氧化鈦、酞菁氧化鈦等。
VI)四乙醯丙酮鈦化合物:例如為四乙醯丙酮鈦等。
VII)鈦酸酯偶合劑:例如為三(十二烷基苯磺醯基)鈦酸異丙酯等。
其中,就發揮更良好之耐化學品性之觀點而言,較佳為有機鈦化合物為選自由上述I)鈦螯合物化合物、II)四烷氧基鈦化合物、及III)二茂鈦化合物所組成之群中之至少1種化合物。尤佳為雙(乙醯乙酸乙酯)二異丙醇鈦、四(正丁醇)鈦、及雙(η5-2,4-環戊二烯-1-基)雙(2,6-二氟-3-(1H-吡咯-1-基)苯基)鈦。
調配有機鈦化合物之情形時之調配量較佳為相對於(A)聚醯亞胺前驅物100質量份為0.05~10質量份,更佳為0.1~2質量份。於有機鈦化合物之調配量為0.05質量份以上之情形時,表現良好之耐熱性及耐化學品性,另一方面,於為10質量份以下之情形時,保存穩定性優異。
增感劑
本實施形態之負型感光性樹脂組合物可為了提高光感度而任意地包含增感劑。作為增感劑,例如可列舉:米其勒酮、4,4'-雙(二乙胺基)二苯甲酮、2,5-雙(4'-二乙胺基亞苄基)環戊烷、2,6-雙(4'-二乙胺基亞苄基)環己酮、2,6-雙(4'-二乙胺基亞苄基)-4-甲基環己酮、4,4'-雙(二甲胺基)查耳酮、4,4'-雙(二乙胺基)查耳酮、對二甲胺基亞桂皮基茚酮、對二甲胺基亞苄基茚酮、2-(對二甲胺基苯基聯伸苯基)-苯并噻唑、2-(對二甲胺基苯基伸乙烯基)苯并噻唑、2-(對二甲胺基苯基伸乙烯基)異萘并噻唑、1,3-雙(4'-二甲胺基亞苄基)丙酮、1,3-雙(4'-二乙胺基亞苄基)丙酮、3,3'-羰基-雙(7-二乙胺基香豆素)、3-乙醯基-7-二甲胺基香豆素、3-乙氧基羰基-7-二甲胺基香豆素、3-苄氧基羰基-7-二甲胺基香豆素、3-甲氧基羰基-7-二乙胺基香豆素、3-乙氧基羰基-7-二乙胺基香豆素、N-苯基-N'-乙基乙醇胺、N-苯基二乙醇胺、N-對甲苯基二乙醇胺、N-苯基乙醇胺、4-𠰌啉基二苯甲酮、二甲胺基苯甲酸異戊酯、二乙胺基苯甲酸異戊酯、2-巰基苯并咪唑、1-苯基-5-巰基四唑、2-巰基苯并噻唑、2-(對二甲胺基苯乙烯基)苯并㗁唑、2-(對二甲胺基苯乙烯基)苯并噻唑、及2-(對二甲胺基苯乙烯基)萘并(1,2-d)噻唑、2-(對二甲胺基苯甲醯基)苯乙烯等。該等可單獨使用1種,或可組合複數種、例如2~5種而使用。
感光性樹脂組合物含有增感劑之情形時之調配量較佳為相對於(A)聚醯亞胺前驅物100質量份為0.1~25質量份。
光聚合性不飽和單體
負型感光性樹脂組合物可為了提高浮凸圖案之解像性而任意地包含具有光聚合性之不飽和鍵之單體(光聚合性不飽和單體)。作為此種單體,較佳為藉由光聚合起始劑進行自由基聚合反應之(甲基)丙烯酸系化合物,可列舉:二乙二醇二甲基丙烯酸酯、四乙二醇二甲基丙烯酸酯等乙二醇或聚乙二醇之單或二丙烯酸酯及甲基丙烯酸酯、丙二醇或聚丙二醇之單或二丙烯酸酯及甲基丙烯酸酯、甘油之單、二或三丙烯酸酯及甲基丙烯酸酯、環己烷二丙烯酸酯及二甲基丙烯酸酯、1,4-丁二醇之二丙烯酸酯及二甲基丙烯酸酯、1,6-己二醇之二丙烯酸酯及二甲基丙烯酸酯、新戊二醇之二丙烯酸酯及二甲基丙烯酸酯、雙酚A之單或二丙烯酸酯及甲基丙烯酸酯、苯三甲基丙烯酸酯、丙烯酸異𦯉酯及甲基丙烯酸異𦯉酯、丙烯醯胺及其衍生物、甲基丙烯醯胺及其衍生物、三羥甲基丙烷三丙烯酸酯及甲基丙烯酸酯、甘油之二或三丙烯酸酯及甲基丙烯酸酯、季戊四醇之二、三、或四丙烯酸酯及甲基丙烯酸酯、以及該等化合物之環氧乙烷或環氧丙烷加成物等化合物,但並不特別限定於以上。
於感光性樹脂組合物含有光聚合性不飽和單體之情形時,其調配量較佳為相對於(A)聚醯亞胺前驅物100質量份為1~50質量份。
熱聚合抑制劑
本實施形態之負型感光性樹脂組合物可為了提高尤其是包含溶劑之溶液之狀態下之保存時之負型感光性樹脂組合物之黏度及光感度之穩定性而任意地包含熱聚合抑制劑。作為熱聚合抑制劑,可使用:對苯二酚、N-亞硝基二苯基胺、對第三丁基鄰苯二酚、啡噻𠯤、N-苯基萘基胺、乙二胺四乙酸、1,2-環己烷二胺四乙酸、二醇醚二胺四乙酸、2,6-二-第三丁基-對甲基苯酚、5-亞硝基-8-羥基喹啉、1-亞硝基-2-萘酚、2-亞硝基-1-萘酚、2-亞硝基-5-(N-乙基-N-磺丙基胺基)苯酚、N-亞硝基-N-苯基羥基胺銨鹽、N-亞硝基-N-(1-萘基)羥基胺銨鹽等。
<硬化浮凸圖案之製造方法及半導體裝置>
本實施形態之硬化浮凸圖案之製造方法包含:
(1)將上述本實施形態之負型感光性樹脂組合物塗佈於基板上而於上述基板上形成感光性樹脂層之步驟、
(2)對上述感光性樹脂層進行曝光之步驟、
(3)對曝光後之上述感光性樹脂層進行顯影而形成浮凸圖案之步驟、及
(4)對上述浮凸圖案進行加熱處理而形成硬化浮凸圖案之步驟。
(1)感光性樹脂層形成步驟
於本步驟中,將本實施形態之負型感光性樹脂組合物塗佈於基材上,視需要於其後進行乾燥而形成感光性樹脂層。作為塗佈方法,可使用先前以來用於感光性樹脂組合物之塗佈之方法、例如利用旋轉塗佈機、棒式塗佈機、刮刀塗佈機、淋幕式塗佈機、網版印刷機等進行塗佈之方法、利用噴塗機進行噴霧塗佈之方法等。
視需要可對包含感光性樹脂組合物之塗膜進行乾燥。作為乾燥方法,可使用風乾、利用烘箱或加熱板之加熱乾燥、真空乾燥等方法。具體而言,於進行風乾或加熱乾燥之情形時,可於20℃~140℃、1分鐘~1小時之條件下進行乾燥。如此可於基板上形成感光性樹脂層。
(2)曝光步驟
於步驟中,藉由紫外線光源等對上述中所形成之感光性樹脂層進行曝光。作為曝光方法,可使用接觸式對準機、鏡面投影曝光機、步進機等曝光裝置。曝光可經由具有圖案之光罩或光柵、或者直接進行。
其後,出於光感度之提高等目的,亦可視需要實施任意之溫度及時間之組合下之曝光後烘烤(PEB)及/或顯影前烘烤。關於烘烤條件之範圍,較佳為溫度為40℃~120℃,並且時間為10秒~240秒,但只要不阻礙本發明之感光性樹脂組合物之各特性,則不限於該範圍。
(3)浮凸圖案形成步驟
於本步驟中,將曝光後之感光性樹脂層中之未曝光部自基板上顯影去除,藉此於基板上殘留浮凸圖案。作為對曝光(照射)後之感光性樹脂層進行顯影之顯影方法,可自先前已知之光阻之顯影方法、例如旋轉噴霧法、覆液法、伴有超音波處理之浸漬法等之中選擇任意之方法來使用。又,顯影之後,出於調整浮凸圖案之形狀等目的,亦可視需要實施任意之溫度及時間之組合下之顯影後烘烤。
作為用於顯影之顯影液,例如較佳為對負型感光性樹脂組合物之良溶劑、或該良溶劑與不良溶劑之組合。作為良溶劑,例如較佳為N-甲基-2-吡咯啶酮、N-環己基-2-吡咯啶酮、N,N-二甲基乙醯胺、環戊酮、環己酮、γ-丁內酯、及α-乙醯基-γ-丁內酯等。作為不良溶劑,例如較佳為甲苯、二甲苯、甲醇、乙醇、異丙醇、乳酸乙酯、丙二醇甲醚乙酸酯及水等。於混合使用良溶劑與不良溶劑之情形時,較佳為根據負型感光性樹脂組合物中之聚合物之溶解性來調整不良溶劑相對於良溶劑之比率。又,亦可將各溶劑組合2種以上、例如組合數種而使用。
(4)硬化浮凸圖案形成步驟
於本步驟中,對藉由上述顯影所得之浮凸圖案進行加熱使感光成分稀散,並且使(A)聚醯亞胺前驅物進行醯亞胺化,藉此轉化為包含聚醯亞胺之硬化浮凸圖案。作為加熱硬化之方法,例如可選擇利用加熱板者、使用烘箱者、使用可設定溫控程式之升溫式烘箱者等各種方法。加熱例如可於170℃~400℃、30分鐘~5小時之條件下進行。作為加熱硬化時之環境氣體,可使用空氣,亦可使用氮氣、氬氣等惰性氣體。
<聚醯亞胺>
由上述聚醯亞胺前驅物組合物形成之硬化浮凸圖案中所含之聚醯亞胺之結構係由下述通式(10)表示。
[化51]
{於通式(10)中,X1
及Y1
係與通式(1)中之X1
及Y1
相同,m為正之整數}
通式(1)中之較佳之X1
與Y1
根據相同之理由而於通式(10)之聚醯亞胺中亦較佳。通式(10)之重複單元數m並無特別限定,可為2~150之整數。又,上述所說明之包含將負型感光性樹脂組合物轉化為聚醯亞胺之步驟之聚醯亞胺之製造方法亦為本發明之一態樣。
<半導體裝置>
於本實施形態中,亦提供具有藉由上述硬化浮凸圖案之製造方法所得之硬化浮凸圖案之半導體裝置。因此,可提供具有作為半導體元件之基材與藉由上述硬化浮凸圖案製造方法而形成於該基材上之聚醯亞胺之硬化浮凸圖案之半導體裝置。又,本發明亦可應用於使用半導體元件作為基材,包含上述硬化浮凸圖案之製造方法作為步驟之一部分之半導體裝置之製造方法。本發明之半導體裝置可藉由形成利用上述硬化浮凸圖案製造方法所形成之硬化浮凸圖案作為表面保護膜、層間絕緣膜、再配線用絕緣膜、覆晶裝置用保護膜、或具有凸塊結構之半導體裝置之保護膜等,且與既知之半導體裝置之製造方法組合而製造。
<顯示體裝置>
於本實施形態中,提供一種具備顯示體元件與設置於該顯示體元件之上部之硬化膜,且該硬化膜為上述硬化浮凸圖案之顯示體裝置。此處,該硬化浮凸圖案可直接與該顯示體元件相接而積層,亦可於其間夾持其他層而積層。例如作為該硬化膜,可列舉:薄膜電晶體(TFT)液晶顯示元件及彩色濾光片元件之表面保護膜、絕緣膜、及平坦化膜、多域垂直配向(MVA)型液晶顯示裝置用之突起、以及有機電致發光(EL)元件陰極用之間隔壁。
本發明之負型感光性樹脂組合物除了如上所述之半導體裝置中之應用以外,亦可用於多層電路之層間絕緣、可撓性銅箔板之覆蓋塗層、阻焊膜、及液晶配向膜等用途。
[實施例]
以下,藉由實施例對本實施形態進行具體說明,但本實施形態並不限定於其。於實施例、比較例、及製造例中,依據以下之方法對聚合物或負型感光性樹脂組合物之物性進行測定及評價。
<測定及評價方法>
(1)重量平均分子量
各樹脂之重量平均分子量(Mw)係使用凝膠滲透層析法(標準聚苯乙烯換算),於以下之條件下進行測定。
泵:JASCO PU-980
檢測器:JASCO RI-930
管柱烘箱:JASCO CO-965 40℃
管柱:昭和電工(股)製造之Shodex KD-806M 串聯2根、或
昭和電工(股)製造之Shodex 805M/806M 串聯
標準單分散聚苯乙烯:昭和電工(股)製造之Shodex STANDARD SM-105
流動相:0.1 mol/L LiBr/N-甲基-2-吡咯啶酮(NMP)
流速:1 mL/min
(2)Cu上之硬化浮凸圖案之製作
使用濺鍍裝置(L-440S-FHL型,Canon-Anelva公司製造),於6英吋矽晶圓(富士見電子工業股份有限公司製造,厚度625±25 μm)上依序濺鍍200 nm厚之Ti、400 nm厚之Cu。繼而,使用塗佈顯影機(D-Spin60A型,SOKUDO公司製造),於該晶圓上旋轉塗佈藉由下述方法製備之負型感光性樹脂組合物,利用加熱板於110℃下預烘烤180秒,形成約7 μm厚之塗膜。使用附測試圖案之遮罩,藉由Prisma GHI(Ultratech公司製造),對該塗膜照射500 mJ/cm2
之能量。繼而,使用環戊酮作為顯影液,以塗佈顯影機(D-Spin60A型,SOKUDO公司製造)對該塗膜進行噴霧顯影,利用丙二醇甲醚乙酸酯進行沖洗,藉此獲得Cu上之浮凸圖案。使用升溫程式固化爐(VF-2000型,Koyo Lindberg公司製造),將於Cu上形成有該浮凸圖案之晶圓於氮氣環境下以表1中記載之硬化溫度加熱處理2小時,藉此於Cu上獲得包含約4~5 μm厚之樹脂之硬化浮凸圖案。
(3)Cu上之硬化浮凸圖案之解像性評價
於光學顯微鏡下觀察利用上述方法所得之硬化浮凸圖案,求出最小開口圖案之尺寸。此時,若所得之圖案之開口部之面積為對應之圖案遮罩開口面積之1/2以上則視為經解像者,將經解像之開口部中具有最小面積者所對應之遮罩開口邊之長度設為解像度。將解像度未達10 μm者設為「優」、將10 μm以上且未達14 μm者設為「良」、將14 μm以上且未達18 μm者設為「可」、將18 μm以上者設為「不可」。
(4)Cu上之硬化浮凸圖案之高溫保存(high temperature storage)試驗與其後之Cu表面孔隙面積評價
使用升溫程式固化爐(VF-2000型,Koyo Lindberg公司製造),將於Cu上形成有該硬化浮凸圖案之晶圓於空氣中以150℃加熱168小時。繼而,使用電漿表面處理裝置(EXAM型,神港精機公司製造),藉由電漿蝕刻將Cu上之樹脂層全部去除。電漿蝕刻條件如下所述。
輸出:133 W
氣體種・流量:O2
:40 mL/min+CF4
:1 mL/min
氣體壓力:50 Pa
模式:困難模式
蝕刻時間:1800秒
藉由FE-SEM(Field-emission Scanning Electron Microscope,場效掃描式電子顯微鏡)(S-4800型,Hitachi High-Technologies公司製造)觀察將樹脂層全部去除後之Cu表面,使用圖像解析軟體(A像君,旭化成公司製造),算出於Cu層之表面所占之孔隙之面積。將評價比較例1中記載之負型感光性樹脂組合物時之孔隙之總面積設為100%時,將孔隙之總面積比率未達50%者判定為「優」、將50%以上且未達75%者判定為「良」、將75%以上且未達100%者判定為「可」、將100%以上者判定為「不可」。
(5)硬化浮凸圖案(聚醯亞胺塗膜)之耐化學品性評價
於將抗蝕劑剝離液{ATMI公司製造,製品名ST-44,主成分為2-(2-胺基乙氧基)乙醇、及1-環己基-2-吡咯啶酮}加熱至50℃而成者中將形成於Cu上之該硬化浮凸圖案浸漬5分鐘,利用流水洗淨1分鐘並進行風乾。其後,利用光學顯微鏡目視觀察膜表面,藉由龜裂等由藥液引起之損傷之有無、或藥液處理後之膜厚之變化率評價耐化學品性。作為評價基準,將未產生龜裂等且膜厚變化率以藥品浸漬前之膜厚為基準時為10%以下者設為「優」、將超過10%~15%以下者設為「良」、將超過15%~20%以下者設為「可」、將產生龜裂者或膜厚變化率超過20%者設為「不可」。
(6)與密封材之密接性試驗
作為環氧系密封材,準備Nagase ChemteX公司製造之R4000系列。於濺鍍有鋁之聚矽氧晶圓上以厚度成為約150微米之方式旋轉塗佈密封材,於130℃下進行熱硬化使環氧系密封材硬化。於上述環氧系硬化膜上以最終膜厚成為10微米之方式塗佈各實施例、及各比較例中製作之感光性樹脂組合物。針對所塗佈之感光性樹脂組合物,使用對準機(PLA-501F,Canon公司製造),以曝光量600 mJ/cm2
之ghi射線對整個面進行曝光。其後,於180℃下進行2小時熱硬化,製作厚度10微米之第1層之硬化膜。
於上述第1層之硬化膜上塗佈於第1層之硬化膜形成中使用之感光性樹脂組合物,於與第1層之硬化膜製作時相同之條件下對整個面進行曝光後進行熱硬化,製作厚度10微米之第2層之硬化膜。於密封材劣化試驗中製作之樣品豎起大頭針(pin),使用牽引試驗機(Quad Group公司製造,Sebastian 5型)進行密接性試驗。即,測定環氧系密封材與由各實施例及各比較例中製作之感光性樹脂組合物製作之硬化浮凸圖案之接著強度,按照以下之基準進行評價。
評價:接著強度70 MPa以上・・・密接力A
接著強度50 MPa以上~未達70MPa・・・密接力B
接著強度30 MPa以上~未達50MPa・・・密接力C
接著強度未達30 MPa・・・密接力D
製造例1:作為(A)聚醯亞胺前驅物之聚合物A-1之合成
將4,4'-氧二鄰苯二甲酸二酐(ODPA)155.1 g添加至容量2 L之可分離式燒瓶中,並添加甲基丙烯酸2-羥基乙酯(HEMA)131.2 g與γ-丁內酯400 mL,於室溫下進行攪拌,一面攪拌一面添加吡啶81.5 g,獲得反應混合物。於由反應引起之放熱結束後,將反應混合物放冷至室溫並放置16小時。繼而,於冰冷下,一面攪拌一面歷時40分鐘向反應混合物中添加使二環己基碳二醯亞胺(DCC)206.3 g溶解於γ-丁內酯180 mL而成之溶液,繼而一面攪拌一面歷時60分鐘添加使4,4'-氧二苯胺(ODA)93.0 g懸浮於γ-丁內酯350 mL而成者。進而於室溫下攪拌2小時後,添加乙醇30 mL攪拌1小時,繼而添加γ-丁內酯400 mL。將反應混合物中產生之沈澱物藉由過濾去除,獲得反應液。將所得之反應液添加至3 L之乙醇中而生成包含粗聚合物之沈澱物。將所生成之粗聚合物過濾分離,溶解於四氫呋喃1.5 L中,獲得粗聚合物溶液。將所得之粗聚合物溶液滴加至28 L之水中使聚合物沈澱,將所得之沈澱物過濾分離後,進行真空乾燥獲得粉末狀之聚合物(聚合物A-1)。利用凝膠滲透層析法(標準聚苯乙烯換算)測定聚合物(A-1)之分子量,結果重量平均分子量(Mw)為20,000。
製造例2:作為(A)聚醯亞胺前驅物之聚合物A-2之合成
使用3,3',4,4'-聯苯四羧酸二酐(BPDA)147.1 g代替製造例1之4,4'-氧二鄰苯二甲酸二酐(ODPA)155.1 g,除此以外,以與上述製造例1中記載之方法同樣之方式進行反應,獲得聚合物(A-2)。利用凝膠滲透層析法(標準聚苯乙烯換算)測定聚合物(A-2)之分子量,結果重量平均分子量(Mw)為22,000。
製造例3:作為(A)聚醯亞胺前驅物之聚合物A-3之合成
使用2,2'-二甲基聯苯-4,4'-二胺(m-TB)98.6 g代替製造例1之4,4'-氧二苯胺(ODA)93.0 g,除此以外,以與上述製造例1中記載之方法同樣之方式進行反應,獲得聚合物(A-3)。利用凝膠滲透層析法(標準聚苯乙烯換算)測定聚合物(A-3)之分子量,結果重量平均分子量(Mw)為21,000。
製造例4:作為(A)聚醯亞胺前驅物之聚合物A-4之合成
使用對苯二胺(50.3 g)代替製造例1之4,4'-氧二苯胺(ODA),除此以外,以與上述製造例1中記載之方法同樣之方式進行反應,獲得聚合物(A-3)。利用凝膠滲透層析法(標準聚苯乙烯換算)測定聚合物(A-3)之分子量,結果重量平均分子量(Mw)為18,000。
<實施例1>MOI-D之製造方法(化合物B-1)
將二乙二醇雙(3-胺基丙基)醚55.1 g(0.25 mol)添加至容量500 mL之可分離式燒瓶中,並添加四氫呋喃150 mL,於室溫下進行攪拌。繼而,於冰冷下,歷時30分鐘將向異氰酸2-甲基丙烯醯氧基乙酯(昭和電工公司製品,製品名:Karenz MOI)77.6 g(0.50 mol)中添加四氫呋喃150 mL而成之溶液滴加至上述燒瓶內,於室溫下攪拌5小時。其後,使用旋轉蒸發器將四氫呋喃蒸餾去除,獲得化合物B-1。化合物B-1之甲基丙烯醯基當量為265 g/mol。
<實施例2>MOI-AP之製造方法(化合物B-2)
於上述實施例1中,將二乙二醇雙(3-胺基丙基)醚55.1 g替換為1,4-丁二醇雙(3-胺基丙醚)51.1 g(0.25 mol),除此以外,以與實施例1同樣之方法進行合成,獲得化合物B-2。化合物B-2之甲基丙烯醯基當量:257 g/mol。
<實施例3>MOI-ODA之製造方法(化合物B-3)
於上述實施例1中,將二乙二醇雙(3-胺基丙基)醚55.1 g替換為ODA 50.1 g(0.25 mol),除此以外,以與實施例1同樣之方法進行合成,獲得化合物B-3。化合物B-3之甲基丙烯醯基當量:255 g/mol。
<實施例4>MOI-DEtA之製造方法(化合物B-4)
於上述實施例1中,將二乙二醇雙(3-胺基丙基)醚55.1 g替換為二乙醇胺26.3 g(0.25 mol),將異氰酸2-甲基丙烯醯氧基乙酯(昭和電工公司製品,製品名:Karenz MOI)77.6 g替換為38.8 g(0.25 mol),除此以外,以與實施例1同樣之方法進行合成,獲得化合物B-4。化合物B-4之甲基丙烯醯基當量:260 g/mol。
<實施例5>MOI-EG-MOI之製造方法(化合物B-5)
於上述實施例1中,將異氰酸2-甲基丙烯醯氧基乙酯(昭和電工公司製品,製品名:Karenz MOI)77.6 g替換為甲基丙烯酸2-(2-異氰酸酯基乙氧基)乙酯99.6 g(0.50 mol),除此以外,以與實施例1同樣之方法進行合成,獲得化合物B-5。化合物B-5之甲基丙烯醯基當量:309 g/mol。
<實施例6>MOI-DEA之製造方法(化合物B-6)
將N-苯基二乙醇胺55.1 g(0.25 mol)添加至容量500 mL之三口茄形燒瓶中,並添加丙二醇單甲醚乙酸酯100 mL,於室溫下進行攪拌。進而,向異氰酸2-甲基丙烯醯氧基乙酯(昭和電工公司製品,製品名:Karenz MOI)77.6 g(0.50 mol)中添加丙二醇單甲醚乙酸酯150 mL。並且,利用油浴將燒瓶升溫至120℃,於120℃下攪拌13小時後,冷卻至室溫。其後,使用旋轉蒸發器,將丙二醇單甲醚乙酸酯蒸餾去除,獲得化合物B-6。化合物B-6之甲基丙烯醯基當量:245 g/mol。
<實施例7>MOI-AEE之製造方法(化合物B-7)
於上述製造例5中,將二乙二醇雙(3-胺基丙基)醚55.1 g替換為2-(2-胺基乙氧基)乙醇26.3 g(0.25 mol),將異氰酸2-甲基丙烯醯氧基乙酯(昭和電工公司製品,製品名:Karenz MOI)77.6 g替換為38.8 g(0.25 mol),除此以外,以與實施例1同樣之方法進行合成,獲得化合物B-7。化合物B-7之甲基丙烯醯基當量:260 g/mol。
<實施例8>MOI-DOA之製造方法(化合物B-8)
於上述實施例1中,將二乙二醇雙(3-胺基丙基)醚55.1 g替換為二-正辛基胺60.4 g(0.25 mol),將異氰酸2-甲基丙烯醯氧基乙酯(昭和電工公司製品,製品名:Karenz MOI)77.6 g替換為38.8 g(0.25 mol),除此以外,以與實施例1同樣之方法進行合成,獲得化合物B-8。化合物B-8之甲基丙烯醯基當量:397 g/mol。
<實施例9>BEI-DEtA之製造方法(化合物B-9)
將二乙醇胺26.3 g(0.25 mol)添加至容量500 mL之可分離式燒瓶中,並添加四氫呋喃150 mL,於室溫下進行攪拌。繼而,於冰冷下,歷時30分鐘將向異氰酸1,1-(雙丙烯醯氧基甲基)乙酯(昭和電工公司製品,製品名:Karenz BEI)59.8 g(0.25 mol)中添加四氫呋喃150 mL而成之溶液滴加至上述燒瓶內,於室溫下攪拌5小時。其後,使用旋轉蒸發器將四氫呋喃蒸餾去除,獲得化合物B-9。化合物B-9之丙烯醯基當量:172 g/mol。
<實施例10>BEI-BHEA之製造方法(化合物B-10)
於上述實施例9中,將二乙醇胺26.3 g(0.25 mol)替換為N,N'-雙(2-羥基乙基)乙二胺37.1 g(0.25 mol),將異氰酸1,1-(雙丙烯醯氧基甲基)乙酯59.8 g(0.25 mol)替換為119.6 g(0.50 mol),除此以外,以與實施例9同樣之方法進行合成,獲得化合物B-10。化合物B-10之丙烯醯基當量為157 g/mol。
<實施例11>(化合物B-11)
將二乙醇胺2.10 g(0.020 mol)添加至容量100 mL之三口燒瓶中,並添加四氫呋喃5.6 g,於室溫下進行攪拌。繼而,於冰冷下,歷時15分鐘將向異氰酸己酯2.67 g(0.021 mol)中添加四氫呋喃5.6 g而成之溶液滴加至上述燒瓶內,於室溫下攪拌4小時。其後,使用旋轉蒸發器將四氫呋喃蒸餾去除,獲得化合物B-11。
<實施例12>(化合物B-12)
於上述實施例11中,將二乙醇胺2.10 g(0.020 mol)替換為2-(2-胺基乙氧基)乙醇2.10 g(0.020 mol),除此以外,以與實施例11同樣之方法進行合成,獲得化合物B-12。
<實施例13>(化合物B-13)
於上述實施例11中,將二乙醇胺2.10 g(0.020 mol)替換為雙(2-甲氧基乙基)胺2.66 g(0.020 mol),除此以外,以與實施例11同樣之方法進行合成,獲得化合物B-13。
<實施例14>
使用聚合物A-1,藉由以下之方法製備負型感光性樹脂組合物,進行所製備之組合物之評價。將作為(A)聚醯亞胺前驅物之聚合物A-1:100 g、作為(B)化合物之實施例1之化合物B-1:8 g、作為(C)光聚合起始劑之1-[9-乙基-6-(2-甲基苯甲醯基)-9H-咔唑-3-基]乙酮1-(O-乙醯基肟)(OXE-02,相當於感光劑C-1):3 g溶解於γ-丁內酯(GBL):150 g中。藉由進而添加少量之GBL,將所得之溶液之黏度調整至約30泊,製成負型感光性樹脂組合物。依據上述方法評價該組合物。將結果示於表1。
<實施例15~26>
以如表1所示之調配比進行製備,除此以外,製備與實施例14同樣之負型感光性樹脂組合物,依據上述方法進行評價。將其結果示於表1。
<實施例27>
使用聚合物A-1及A-2,藉由以下之方法製備負型感光性樹脂組合物,進行所製備之組合物之評價。將作為(A)聚醯亞胺前驅物之聚合物A-1:50 g、及聚合物A-2:50 g、作為(B)化合物之化合物B-1:8 g、作為(C)光聚合起始劑之1-[9-乙基-6-(2-甲基苯甲醯基)-9H-咔唑-3-基]乙酮1-(O-乙醯基肟)(OXE-02,相當於感光劑C-1):3 g溶解於γ-丁內酯(GBL):150 g中。藉由進而添加少量之GBL,將所得之溶液之黏度調整至約30泊,製成負型感光性樹脂組合物。依據上述方法評價該組合物。將結果示於表2。
<實施例28~36>
以如表2所示之調配比進行製備,除此以外,製備與實施例14同樣之負型感光性樹脂組合物,依據上述方法進行評價。將其結果示於表1。
<實施例37>
使用聚合物A-3,藉由以下之方法製備負型感光性樹脂組合物,進行所製備之組合物之評價。將作為(A)聚醯亞胺前驅物之聚合物A-3:100 g、作為(B)化合物之化合物B-1:8 g、作為(C)光聚合起始劑之1-[9-乙基-6-(2-甲基苯甲醯基)-9H-咔唑-3-基]乙酮1-(O-乙醯基肟)(OXE-02,相當於感光劑C-1):3 g溶解於γ-丁內酯(GBL):150 g中。藉由進而添加少量之GBL,將所得之溶液之黏度調整至約30泊,製成負型感光性樹脂組合物。依據上述方法評價該組合物。將結果示於表2。
<實施例38>
使用聚合物A-4代替聚合物A-3,除此以外,與實施例24同樣地製備負型感光性樹脂組合物,依據上述方法進行評價。將結果示於表2。
<比較例1>
除了不使用(B)化合物以外,與實施例1同樣地製造負型感光性樹脂組合物,依據上述方法進行評價。將結果示於表2。
表1中記載之化合物(B-1~B-13)與感光劑(C-1)分別為以下之化合物。
C-1:1-[9-乙基-6-(2-甲基苯甲醯基)-9H-咔唑-3-基]乙酮1-(O-乙醯基肟)(商標名:IRGACURE OXE-02(OXE-02))
[表1]
實施例14 | 實施例15 | 實施例16 | 實施例17 | 實施例18 | 實施例19 | 實施例20 | 實施例21 | 實施例22 | 實施例23 | 實施例24 | 實施例25 | 實施例26 | |||
聚合物 | A-1 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | |
A-2 | |||||||||||||||
A-3 | |||||||||||||||
A-4 | |||||||||||||||
化合物 | B-1 | 8 | |||||||||||||
B-2 | 8 | ||||||||||||||
B-3 | 8 | ||||||||||||||
B-4 | 8 | ||||||||||||||
B-5 | 8 | ||||||||||||||
B-6 | 8 | ||||||||||||||
B-7 | 8 | ||||||||||||||
B-8 | 8 | ||||||||||||||
B-9 | 8 | ||||||||||||||
B-10 | 8 | ||||||||||||||
B-11 | 8 | ||||||||||||||
B-12 | 8 | ||||||||||||||
B-13 | 8 | ||||||||||||||
感光劑 | C-1 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | |
硬化溫度(℃) | 180 | 180 | 180 | 180 | 180 | 180 | 180 | 180 | 180 | 180 | 180 | 180 | 180 | ||
Cu表面孔隙面積評價 | 良 | 良 | 可 | 良 | 可 | 可 | 良 | 良 | 良 | 良 | 良 | 良 | 良 | ||
解像性評價 | 良 | 良 | 良 | 良 | 可 | 良 | 良 | 可 | 可 | 可 | 可 | 可 | 可 | ||
耐化學品性評價 | 良 | 良 | 可 | 良 | 可 | 可 | 良 | 良 | 良 | 良 | 良 | 良 | 可 | ||
與密封材之密接性試驗 | B | B | C | A | B | C | A | C | A | A | A | A | B | ||
(單位:g) | |||||||||||||||
[表2]
[產業上之可利用性]
實施例27 | 實施例28 | 實施例29 | 實施例30 | 實施例31 | 實施例32 | 實施例33 | 實施例34 | 實施例35 | 實施例36 | 實施例37 | 實施例38 | 比較例1 | ||
聚合物 | A-1 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 100 | ||
A-2 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | ||||
A-3 | 100 | |||||||||||||
A-4 | 100 | |||||||||||||
化合物 | B-1 | 8 | 8 | 8 | ||||||||||
B-2 | 8 | |||||||||||||
B-3 | 8 | |||||||||||||
B-4 | 8 | |||||||||||||
B-5 | 8 | |||||||||||||
B-6 | 8 | |||||||||||||
B-7 | 8 | |||||||||||||
B-8 | 8 | |||||||||||||
B-9 | 8 | |||||||||||||
B-10 | 8 | |||||||||||||
B-11 | ||||||||||||||
B-12 | ||||||||||||||
B-13 | ||||||||||||||
感光劑 | C-1 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
硬化溫度(℃) | 180 | 180 | 180 | 180 | 180 | 180 | 180 | 180 | 180 | 180 | 180 | 180 | 180 | |
Cu表面孔隙面積評價 | 優 | 優 | 良 | 優 | 良 | 良 | 優 | 優 | 優 | 良 | 良 | 良 | 不可 | |
解像性評價 | 優 | 優 | 良 | 優 | 良 | 良 | 優 | 良 | 優 | 優 | 優 | 優 | 不可 | |
耐化學品性評價 | 良 | 良 | 良 | 優 | 良 | 可 | 優 | 優 | 優 | 良 | 良 | 良 | 不可 | |
與密封材之密接性試驗 | B | B | C | A | B | C | A | C | A | A | B | B | D | |
(單位:g) |
藉由使用本發明之負型感光性樹脂組合物,可獲得具有高耐化學品性與解像性之硬化浮凸圖案,且可抑制Cu表面之孔隙產生。本發明可較佳地用於對例如半導體裝置、多層配線基板等電性、電子材料之製造有用之感光性材料之領域。
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