TW202321033A - 積層體及具備積層體之電子機器 - Google Patents
積層體及具備積層體之電子機器 Download PDFInfo
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- TW202321033A TW202321033A TW111126704A TW111126704A TW202321033A TW 202321033 A TW202321033 A TW 202321033A TW 111126704 A TW111126704 A TW 111126704A TW 111126704 A TW111126704 A TW 111126704A TW 202321033 A TW202321033 A TW 202321033A
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- epoxy resin
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Abstract
本發明提供一種不僅在常態時可維持鍍覆層之密合性、在長期耐熱試驗後亦可維持鍍覆層之密合性之積層體。
本發明之積層體係具備支持體、及於上述支持體依次配置之底塗層、金屬粒子層及金屬鍍覆層者,且上述金屬粒子層包含金屬粒子、具有含鹼性氮原子之基之化合物、及環氧樹脂。
Description
本發明係關於一種積層體,更詳細而言,係關於一種可較佳用於電磁波屏蔽、印刷配線板、積體電路、有機電晶體等電子機器之積層體、及使用其之電子機器。
隨著電子機器之小型化、高速化,要求印刷配線板之高速化、高性能化,為了響應該要求,尋求一種具有表面平滑且足夠薄之導電層(金屬層)之印刷配線板。又,作為構成該印刷配線板者,已知有撓性覆銅積層板(以下,縮寫為「FCCL」)。FCCL主要藉由以下方法製造,即,藉由環氧樹脂系接著劑將耐熱性高分子膜與銅箔貼合。
作為使用銅箔之FCCL,一面拉出捲繞成滾筒狀之銅箔,一面將環氧樹脂系接著劑塗佈於表面,進而將銅箔貼合於高分子膜,因此操作方面無法使銅箔足夠變薄。進而,存在如下問題,即,需要使銅箔表面粗化以提高與高分子膜之密合性,於用於實現印刷配線板之高密度化、高性能化所需之頻率(GHz頻帶)、高傳輸速度(數十Gbps)區域發生傳輸損耗。
另一方面,作為使FCCL之銅層薄膜化之方法,先前提出有以下方法:於高分子膜之表面藉由蒸鍍或濺鍍法形成金屬薄膜,其後,於該金屬薄膜上藉由電解鍍銅法、無電解鍍覆法、或兩者組合之方法形成銅(例如,專利文獻1)。然而,於該方法中,存在以下等問題,即,由於使用蒸鍍法或濺鍍法以形成金屬薄膜,故而需要大型之真空設備,在設備方面,基材尺寸受到限定。
進而,作為使FCCL之銅層薄膜化之其他方法,例如於專利文獻2中提出有,使用含有無機奈米粒子、酞青系配位基及溶劑(分散介質)之組成物作為設置於支持體與金屬鍍覆層之間之鍍覆基材層,提高支持體與鍍覆層之密合性。又,於專利文獻3中提出有,藉由於支持體上設置含有具有胺基三環之化合物之層作為底塗層,於該底塗層上設置金屬奈米粒子層,而提高支持體與金屬鍍覆層之密合性。進而,於專利文獻4中提出有,藉由於支持體與鍍覆層之間介置含有金屬粒子及特定之環氧化合物與嵌段聚異氰酸酯之反應物之金屬粒子層,而提高支持體與鍍覆層之密合性。
先前技術文獻
專利文獻
[專利文獻1]日本特開2015-118044號公報
[專利文獻2]日本特開2017-218664號公報
[專利文獻3]國際公開第2019/013038號說明書
[專利文獻4]日本特開2020-59185號公報
發明所欲解決之問題
上述專利文獻1~4中所提出之積層構造均在常態時、即形成鍍覆層後於常溫環境下提高支持體與鍍覆層之密合性。然而,此次,本發明人等例如於150℃進行300小時之長期耐熱試驗,結果判明存在下述新課題,即,即便於常態時具有優異之密合性,長期耐熱試驗後密合性亦會顯著降低。
因此,本發明之目的在於提供一種不僅在常態時可維持鍍覆層之密合性、在長期耐熱試驗後亦可維持鍍覆層之密合性之積層體。
解決問題之技術手段
針對上述課題,本發明人等獲得下述見解,即,剛實施鍍覆後(常態)之密合性及長期耐熱試驗後之密合性與底塗層與金屬粒子層之界面強度相關,藉由於金屬粒子層中導入環氧基等官能基,與底塗層中之酸基(酚性羥基或羧酸基等)反應,可提高底塗層與金屬粒子層之界面強度,結果可維持鍍覆層之密合性。本發明係基於該見解而完成者。即,本發明之主旨如下所示。
[1]一種積層體,其具備支持體、及於上述支持體依次配置之底塗層、金屬粒子層及金屬鍍覆層,且上述金屬粒子層包含金屬粒子、具有陽離子性基之化合物、及環氧樹脂。
[2]如[1]所記載之積層體,其中,上述金屬粒子層中,相對於金屬粒子100質量份,包含0.1質量份以上且10質量份以下之上述環氧樹脂。
[3]如[1]或[2]所記載之積層體,其中,上述環氧樹脂為脂肪族環氧樹脂。
[4]如[1]至[3]中任一項所記載之積層體,其中,上述環氧樹脂為脂環式環氧樹脂。
[5]如[1]至[4]中任一項所記載之積層體,其中,上述具有陽離子性基之化合物為具有含鹼性氮原子之基的化合物。
[6]如[1]至[5]中任一項所記載之積層體,其中,上述金屬粒子層中,相對於金屬粒子100質量份包含0.01質量份以上且50質量份以下之上述具有陽離子性基之化合物。
[7]如[1]至[6]中任一項所記載之積層體,其中,上述底塗層進而含有:具有胺基三環之化合物。
[8]如[1]至[7]中任一項所記載之積層體,其中,上述支持體由可撓性樹脂材料構成。
[9]如[1]至[8]中任一項所記載之積層體,其用於電子機器。
[10]如[9]所記載之積層體,其中,電子機器選自印刷配線板及電磁波屏蔽。
[11]一種電子機器,其具備[1]至[10]中任一項所記載之積層體。
發明之效果
根據本發明,於依次具備支持體、底塗層、金屬粒子層及金屬鍍覆層之積層體中,藉由在金屬粒子層中添加環氧樹脂,不僅在常態時可維持金屬鍍覆層之密合性,在長期耐熱試驗後亦可維持金屬鍍覆層之密合性。
[積層體]
本發明之積層體具備支持體、及於上述支持體依次配置之底塗層、金屬粒子層及金屬鍍覆層。以下,對構成本發明之積層體之各要素進行說明。
<支持體>
作為支持體,只要為具備可依次積層下述底塗層、金屬粒子層、金屬鍍覆層之機械強度之材料,則可不受特別限制地使用,例如可例舉:聚醯亞胺樹脂、聚醯胺醯亞胺樹脂、聚醯胺樹脂、聚對苯二甲酸乙二酯樹脂、聚對苯二甲酸丁二酯樹脂、聚萘二甲酸乙二酯樹脂、聚碳酸酯樹脂、丙烯腈-丁二烯-苯乙烯(ABS)樹脂、聚苯乙烯、環烯烴聚合物、液晶聚合物、聚醚醚酮、聚苯硫醚樹脂、聚苯碸、聚苯醚、聚(甲基)丙烯酸甲酯等丙烯酸樹脂、聚偏二氟乙烯樹脂、聚氯乙烯樹脂、聚偏二氯乙烯樹脂、聚乙烯醇樹脂、聚乙烯樹脂、聚丙烯樹脂、胺酯樹脂(urethane resin)、矽、碳化矽、氮化鎵、藍寶石、陶瓷、玻璃、玻璃環氧樹脂、玻璃聚醯亞胺、酚醛紙、類鑽碳、氧化鋁、聚酯纖維、聚醯胺纖維、聚芳醯胺纖維等合成纖維、碳纖維等無機纖維、纖維素奈米纖維等天然纖維等。該等支持體較佳為絕緣性者,可使用多孔質者。又,支持體可為由單一材料所構成者,亦可為積層多種材料而成者。
又,作為支持體,例如亦可使用:由聚酯纖維、聚醯胺纖維、芳香族聚醯胺纖維等合成纖維、棉、麻等天然纖維等所構成之基材。亦可對上述纖維預先實施加工。
作為支持體,一般而言,較佳為大多數情況下用作形成電路等之導電性圖案時之支持體的由聚醯亞胺樹脂、聚對苯二甲酸乙二酯、聚萘二甲酸乙二酯、玻璃、纖維素奈米纖維等所構成之支持體。
上述之中,就對積層體賦予柔軟性且獲得可彎曲之最終製品之方面而言,支持體較佳為由可撓性樹脂材料構成。具體而言,較佳為藉由進行單軸或雙軸延伸等所形成之膜狀或片狀之形態。作為膜狀或片狀之支持體,例如可例舉:聚醯亞胺膜、聚對苯二甲酸乙二酯膜、聚萘二甲酸乙二酯膜、聚對苯二甲酸丁二酯膜等。
於支持體之形狀為膜狀或片狀之情形時,厚度並無特別限定,若考慮柔軟性或彎曲性,則厚度通常為1~5,000 μm左右,更佳為1~500 μm,更佳為1~200 μm。
關於支持體表面,為了更加提高與下述底塗層之密合性,亦可視需要形成「不失去平滑性之程度之微細凹凸」,或進行表面處理以導入羥基、羰基、羧基等官能基。例如可例舉:電暈放電處理等電漿放電處理、紫外線處理等乾式處理、使用水、酸/鹼等之水溶液或有機溶劑等之濕式處理等方法。
<底塗層>
底塗層具有提高上述支持體與下述金屬粒子層之密合性之功能。底塗層較佳為包含具有可與下述金屬粒子層中所含之環氧樹脂反應之官能基之化合物,例如可例舉:具有酚性羥基(羥基苯基)或羧基之化合物。該等化合物可為低分子量之化合物,亦可為更高分子量之樹脂等化合物。
作為具有胺基三環之低分子量之化合物,可使用具有胺基三環之各種添加劑。作為市售品,可例舉:作為具有胺基三環及羥基之化合物之VT、VD-3、VD-4(均為四國化成股份有限公司)、或作為具有胺基三環及乙氧基矽烷基之化合物之VD-5(四國化成股份有限公司)等。該等可單獨使用1種,亦可併用2種以上。
於使用具有胺基三環之低分子量之化合物之情形時,較佳使用黏合劑樹脂以形成底塗層。作為黏合劑樹脂,例如可例舉:胺酯樹脂、丙烯酸樹脂、胺酯-乙烯複合樹脂、環氧樹脂、醯亞胺樹脂、醯胺樹脂、三聚氰胺樹脂、酚樹脂、脲甲醛樹脂、使用苯酚作為封端劑之嵌段聚異氰酸酯、聚乙烯醇、聚乙烯吡咯啶酮等。該等黏合劑樹脂可單獨使用1種,亦可併用2種以上。該等之中,就可更加提高密合性之方面而言,較佳為環氧樹脂,更佳為併用酚醛清漆樹脂與環氧樹脂。
胺基三改質酚醛清漆樹脂係經由亞甲基使胺基三環結構與酚結構鍵結而成之酚醛清漆樹脂。胺基三改質酚醛清漆樹脂例如可藉由以下方式獲得,即,於烷基胺等弱鹼性觸媒之存在下或無觸媒時,使三聚氰胺、苯并胍胺、乙胍等胺基三化合物、苯酚、甲酚、丁基苯酚、雙酚A、苯基苯酚、萘酚、間苯二酚等酚化合物與甲醛在中性附近發生共縮合反應,或使甲醚化三聚氰胺等胺基三化合物之烷基醚化物與酚化合物反應。
胺基三改質酚醛清漆樹脂較佳為實質上不具有羥甲基者。又,亦可於胺基三改質酚醛清漆樹脂中包含其製造時作為副產物所產生之僅胺基三結構與亞甲基鍵結之分子、僅酚結構與亞甲基鍵結之分子等。進而,亦可包含少量之未反應原料。
作為酚結構,例如可例舉:苯酚殘基、甲酚殘基、丁基苯酚殘基、雙酚A殘基、苯基苯酚殘基、萘酚殘基、間苯二酚殘基等。又,此處之殘基意指與芳香環之碳鍵結之氫原子至少缺失1個之結構。例如,於為苯酚之情形時,意指羥基苯基。
作為環氧樹脂,可例舉:雙酚A型環氧樹脂、雙酚F型環氧樹脂、聯苯型環氧樹脂、甲酚酚醛清漆型環氧樹脂、苯酚酚醛清漆型環氧樹脂、雙酚A酚醛清漆型環氧樹脂、醇醚型環氧樹脂、四溴雙酚A型環氧樹脂、萘型環氧樹脂、具有來自9,10-二氫-9-氧雜-10-磷雜菲-10-氧化物衍生物之結構之含磷之環氧化合物、具有來自二環戊二烯衍生物之結構之環氧樹脂、環氧化大豆油等油脂之環氧化物等。該等環氧樹脂可單獨使用1種,亦可併用2種以上。
作為與胺基三改質酚醛清漆樹脂併用之環氧樹脂,就可更加提高密合性之方面而言,較佳為雙酚A型環氧樹脂、雙酚F型環氧樹脂、聯苯型環氧樹脂、甲酚酚醛清漆型環氧樹脂、苯酚酚醛清漆型環氧樹脂、雙酚A酚醛清漆型環氧樹脂等芳香族環氧樹脂,尤佳為雙酚A型環氧樹脂。
就可更加提高密合性之方面而言,環氧樹脂之環氧當量較佳為100~300 g/當量,更佳為120~250 g/當量。
於底塗層含有胺基三改質酚醛清漆樹脂及環氧樹脂之情形時,就提高密合性之觀點而言,胺基三改質酚醛清漆樹脂中之酚性羥基(x)與環氧樹脂中之環氧基(y)之莫耳比(y/x)較佳為0.1~5之範圍,更佳為0.2~3之範圍。
底塗層除了包含上述環氧樹脂或具有胺基三環之化合物以外,亦可視需要進而含有交聯劑。作為交聯劑,較佳使用多元羧酸。作為多元羧酸,例如可例舉:1,2,4-苯三甲酸酐、焦蜜石酸酐、順丁烯二酸酐、琥珀酸等。該等交聯劑可單獨使用1種,亦可併用2種以上。又,該等交聯劑之中,就可更加提高密合性之方面而言,較佳為1,2,4-苯三甲酸酐。
又,底塗層亦可視需要包含除上述成分以外之其他樹脂。作為其他樹脂,例如可例舉:胺酯樹脂、丙烯酸樹脂、嵌段異氰酸酯樹脂、三聚氰胺樹脂、酚樹脂等。該等其他樹脂可單獨使用1種,亦可併用2種以上。
又,當形成上述底塗層時,為了設為塗佈於支持體時容易塗佈之黏度,較佳為除了摻合上述成分以外亦摻合有機溶劑。作為有機溶劑,例如可例舉:甲苯、乙酸乙酯、甲基乙基酮、甲基異丁基酮、環己酮、異丙醇等。
有機溶劑之使用量可根據塗佈於支持體時所使用之塗佈方法、底塗層之所需厚度進行適當調整。
進而,亦可於形成底塗層之塗佈液中視需要適當添加皮膜形成助劑、調平劑、增黏劑、撥水劑、消泡劑、抗氧化劑等公知之添加劑進行使用。
底塗層可藉由以下方式形成,即,將包含上述成分之塗佈液塗佈於支持體之表面之一部分或整個面,對塗佈液中所含之有機溶劑進行加熱或乾燥而去除。
作為塗佈方法,並無特別限制,可應用先前公知之塗佈法,例如可例舉:凹版方式、塗佈方式、網版方式、滾筒方式、旋轉方式、噴霧方式、毛細管方式等方法。
作為將塗佈液塗佈於支持體之表面後,去除該塗佈膜中所含之有機溶劑之方法,例如通常為使用乾燥機進行乾燥使有機溶劑揮發之方法。作為乾燥溫度,可設定為可使所使用之有機溶劑揮發且不會對支持體造成熱變形等不良影響之範圍之溫度。
底塗層厚度可根據使用本發明之積層體之用途進行適當調整,較佳為支持體與下述金屬粒子層之密合性更加提高之範圍,底塗層之厚度較佳為10 nm~1 μm,更佳為10 nm~500 nm。底塗層之厚度可根據塗佈液對支持體之塗佈量進行調整。
就與下述金屬粒子層之密合性之觀點而言,底塗層之表面可視需要藉由電暈放電處理法等電漿放電處理法、紫外線處理法等乾式處理法、使用水或酸性或鹼性藥液、有機溶劑等之濕式處理法進行表面處理。
<金屬粒子層>
金屬粒子層係設置於上述底塗層上者,係用於形成下述金屬鍍覆層所設置之層。於本發明中,金屬粒子層包含金屬粒子、具有陽離子性基之化合物、及環氧樹脂。藉由在金屬粒子層中包含環氧樹脂,可與構成上述底塗層之成分(例如,可與具有陽離子性基之化合物化學鍵結之化合物)形成化學鍵,藉此提高底塗層與金屬粒子層之界面之密合性,結果認為,例如即便於在150℃進行300小時之長期耐熱試驗之情形時,亦可維持密合性。
作為構成金屬粒子之金屬,可例舉:過渡金屬或其化合物,該等之中,較佳為離子性過渡金屬。作為離子性過渡金屬,可例舉:銅、銀、金、鎳、鈀、鉑、鈷等,就下述金屬鍍覆層之形成性之觀點而言,較佳為銀。再者,於本發明中,金屬粒子係指由上述金屬所構成之粒子狀或纖維狀者。
於使用粒子狀金屬之情形時,就可更加減少電阻值之觀點而言,平均粒徑較佳為1~100 nm,更佳為1~50 nm。再者,於本說明書中,平均粒徑意指藉由分散良溶劑稀釋金屬粒子並藉由動態光散射法所測得之體積平均值(D50)。又,於使用纖維狀金屬之情形時,亦就可更加減少電阻值之觀點而言,纖維之直徑較佳為5~100 nm,更佳為5~50 nm。又,纖維長度較佳為0.1~100 μm,更佳為0.1~30 μm。
金屬粒子層中所含之具有陽離子性基之化合物具有下述功能,即,使上述金屬粒子良好分散,且與底塗層之構成成分中所含之官能基、例如環氧樹脂中所含之環氧基反應,進而提高底塗層與金屬粒子層之界面之密合性。具有陽離子性基之化合物亦可為同樣地對金屬粒子層中所含之金屬粒子進行表面處理所得者。
作為具有陽離子性基之化合物,可較佳使用具有含鹼性氮原子之基的化合物。作為具有含鹼性氮原子之基之化合物,例如可使用:聚伸乙基亞胺、聚伸丙基亞胺等聚伸烷基亞胺、在聚伸烷基亞胺加成有聚氧伸烷基之化合物等。就可提高金屬粒子之水分散穩定性之方面而言,較佳為在聚伸烷基亞胺加成有聚氧伸烷基之化合物。
作為聚氧伸烷基,例如可使用:聚氧伸乙基、聚(氧伸乙基-氧伸丙基)等無規結構或嵌段結構。作為聚氧伸烷基,就金屬粒子之水分散穩定性之觀點而言,較佳使用具有氧伸乙基單元者,較佳使用相對於聚氧伸烷基整體以10~90質量%之範圍具有氧伸乙基單元者。
作為在聚伸烷基亞胺加成有聚氧伸烷基之化合物,例如可使用:具有由聚伸乙基亞胺所構成之結構、及聚乙烯氧化物結構等聚氧伸烷基結構者。
聚伸乙基亞胺及聚氧伸烷基可為直鏈狀之經鍵結者,亦可為相對於由聚伸乙基亞胺所構成之主鏈在其側鏈接枝並鍵結有聚氧伸烷基者。
作為在聚伸烷基亞胺加成有聚氧伸烷基之化合物,具體而言,可使用:聚伸乙基亞胺與聚氧伸乙基之共聚物、存在於其主鏈中之亞胺基之一部分與環氧乙烷發生加成反應所獲得之化合物等。該等較佳為具有嵌段結構。
作為在聚伸烷基亞胺加成有聚氧伸烷基之化合物,亦可使用:藉由使聚伸烷基亞胺所具有之胺基、聚氧乙二醇所具有之羥基與環氧樹脂所具有之環氧基反應所獲得者。
作為聚伸烷基亞胺,可使用市售品,例如可使用EPOMIN(註冊商標),可使用SP-003、SP-006、SP-012、SP-018、SP-200、P-1000等(以上為日本觸媒股份有限公司)。
作為金屬粒子層中所含之具有陽離子性基之化合物之含量,就金屬粒子之分散性、底塗層與金屬粒子層之界面密合性、及下述金屬鍍覆層之形成性之觀點而言,較佳為相對於金屬粒子100質量份為0.01質量份以上且50質量份以下,更佳為相對於金屬粒子100質量份為0.01質量份以上且10質量份以下。
作為金屬粒子層中所含之環氧樹脂,可使用與上述底塗層中所說明之環氧樹脂相同者,於使用具有含鹼性氮原子之基的化合物作為具有陽離子性基之化合物之情形時,就抑制環氧樹脂與具有含鹼性氮原子之基的化合物反應之觀點而言,可較佳使用脂肪族環氧樹脂,其中可更佳使用脂環式環氧樹脂。
作為脂肪族環氧樹脂,例如可例舉:新戊二醇二縮水甘油醚、二羥甲基環己烷二縮水甘油醚、1,4-環己烷二縮水甘油醚、1,3-環己烷二縮水甘油醚、1,2-環己烷二縮水甘油醚、二羥甲基二環戊二烯二縮水甘油醚、六氫鄰苯二甲酸二縮水甘油酯、六氫對苯二甲酸二縮水甘油酯、1,4-丁二醇二縮水甘油醚、1,6-己二醇二縮水甘油醚等非環式脂肪族環氧樹脂、或3',4'-環氧環己基甲基-3,4-環氧環己烷羧酸酯、ε-己內酯改質3',4'-環氧環己基甲基-3,4-環氧環己烷羧酸酯、二氧化檸檬烯、二氧化二環戊二烯、氫化雙酚A型二縮水甘油醚等脂環式環氧樹脂。該等脂肪族環氧樹脂可單獨使用1種,亦可併用2種以上。
於本發明中,就抑制與金屬粒子層形成用塗佈液中之具有含鹼性氮原子之基的化合物之反應、或與下述溶劑之相溶性之觀點而言,較佳為脂環式環氧樹脂,可尤佳使用3',4'-環氧環己基甲基-3,4-環氧環己烷羧酸酯、ε-己內酯改質3',4'-環氧環己基甲基-3,4-環氧環己烷羧酸酯。
亦可使用作為上述脂肪族環氧樹脂所市售者,例如可例舉:ADEKA RESIN EP-4080S、ADEKA RESIN EP-4085S、ADEKA RESIN EP-4088S(以上為ADEKA股份有限公司製造)、Celloxide 2021P、Celloxide 2081、Celloxide 2083、Celloxide 2085、Celloxide 8010、EHPE 3150、EPOLEAD PB 3600、EPOLEAD PB 4700(以上為大賽璐股份有限公司製造)、Denacol EX-121、Denacol EX-211、Denacol EX-212、Denacol EX-212L、Denacol EX-214、Denacol EX-214L、Denacol EX-216、Denacol EX-216L、Denacol EX-252、Denacol EX-252L、Denacol EX-321、Denacol EX-321L、Denacol EX-830、Denacol EX-830L、Denacol EX-850、Denacol EX-850L(以上為Nagase chemteX股份有限公司製造)、Shofree CDMDG、Shofree PETG(以上為昭和電工股份有限公司製造)等。
作為金屬粒子層中所含之環氧樹脂之含量,就金屬鍍覆層對金屬粒子層之形成性及金屬粒子層與金屬鍍覆層之密合性之觀點而言,相對於金屬粒子100質量份較佳為0.1質量份以上且10質量份以下,更佳為0.1質量份以上且5質量份以下。
金屬粒子層可藉由以下方式形成,即,使上述成分溶解或分散於適當之溶劑中製備塗佈液,於底塗層上進行塗佈形成塗膜,使塗膜乾燥而去除溶劑。
作為金屬粒子層形成用塗佈液中所使用之溶劑,例如可使用:蒸餾水、離子交換水、純水、超純水等水性介質、以及醇、醚、酯及酮等有機溶劑。
作為醇,例如可使用:甲醇、乙醇、正丙醇、異丙醇、正丁醇、異丁醇、第二丁醇、第三丁醇、庚醇、己醇、辛醇、壬醇、癸醇、十一醇、十二烷醇、十三烷醇、十四烷醇、十五烷醇、硬脂醇、烯丙醇、環己醇、松油醇、萜品醇、二氫萜品醇、乙二醇單甲醚、乙二醇單乙醚、乙二醇單丁醚、二乙二醇單乙醚、二乙二醇單甲醚、二乙二醇單丁醚、四乙二醇單丁醚、丙二醇單甲醚、二丙二醇單甲醚、三丙二醇單甲醚、丙二醇單丙醚、二丙二醇單丙醚、丙二醇單丁醚、二丙二醇單丁醚、三丙二醇單丁醚等。
於塗佈液中可組合使用丙酮、環己酮、甲基乙基酮等酮溶劑以調整物性。此外,可使用乙酸乙酯、乙酸丁酯、乙酸3-甲氧基丁酯、乙酸3-甲氧基-3-甲基-丁酯等酯溶劑、甲苯等烴溶劑、特別是碳數為8以上之烴溶劑。
關於碳數為8以上之烴溶劑,例如可將辛烷、壬烷、癸烷、十二烷、十三烷、十四烷、環辛烷、二甲苯、1,3,5-三甲苯、乙基苯、十二烷基苯、四氫萘、三甲基苯環己烷等非極性溶劑視需要組合使用。進而,亦可併用作為混合溶劑之礦油精及溶劑油等。
作為其他溶劑,例如可使用:2-乙基-1,3-己二醇、乙二醇、二乙二醇、三乙二醇、聚乙二醇、丙二醇、二丙二醇、1,2-丁二醇、1,4-丁二醇、2,3-丁二醇、甘油、乙二醇單甲醚、乙二醇單乙醚、乙二醇單丁醚、二乙二醇單乙醚、二乙二醇單丁醚、乙二醇單乙醚乙酸酯、乙二醇單丁醚乙酸酯、二乙二醇單乙醚乙酸酯、二乙二醇單丁醚乙酸酯等。
就提高塗佈於底塗層時之潤濕性等之觀點而言,於金屬粒子層形成用塗佈液中亦可視需要包含界面活性劑、消泡劑、流變調整劑等。
金屬粒子層形成用塗佈液中所含之金屬粒子之含量相對於塗佈液整體較佳為1~90質量%,更佳為5~60質量%,進而較佳為10~40質量%。又,具有陽離子性基之化合物之含量相對於塗佈液整體較佳為0.01~10質量%,更佳為0.05~5質量%。又,於塗佈並乾燥塗佈液而形成金屬粒子層之情形時(即,去除了溶劑之情形時),較佳為於金屬粒子層中包含0.01~10質量%之環氧樹脂,更佳為於金屬粒子層中包含0.05~5質量%之環氧樹脂。
金屬粒子層可為設置於底塗層之整個表面之層,亦可為設置於底塗層之表面之一部分之層。作為在底塗層之表面之一部分形成金屬粒子層之情形,具體而言,可例舉:在底塗層之表面畫線所形成之細線狀之層。於將本發明之積層體用於印刷配線板等之情形時,上述細線狀之層較為適合。於該情形時,細線狀之層(圖案)之寬度(線寬)大致為0.01~200 μm左右,較佳為0.01~150 μm左右。
就形成低電阻且導電性優異之導電性圖案之方面而言,金屬粒子層較佳為具有0.01~100 μm之厚度。又,於金屬粒子層為細線狀者之情形時,其厚度(高度)較佳為0.05~50 μm之範圍。金屬粒子層之厚度可根據塗佈液對底塗層之塗佈量進行調整。
作為將金屬粒子層形成用塗佈液塗佈於底塗層之方法,例如除了凸版反轉印刷法等反轉印刷法之外,還可例舉噴墨印刷法、網版印刷法、膠版印刷法、凹版印刷法、旋轉塗佈法、噴塗法、棒式塗佈法、模嘴塗佈法、狹縫式塗佈法、輥式塗佈法、浸漬塗佈法等。再者,於以實現電子電路等之高密度化時所要求之大致0.01~100 μm左右之細線狀進行塗佈(印刷)之情形時,較佳為採用噴墨印刷法。
<金屬鍍覆層>
構成本發明之積層體之金屬鍍覆層例如係為了以下目的而設置之層,即,於將積層體用於印刷配線板或電磁波屏蔽等之情形時,於長期不產生斷線等之情況下,形成可維持良好通電性之可靠性較高之配線圖案。
金屬鍍覆層係形成於上述金屬粒子層之上之層,作為其形成方法,較佳為藉由鍍覆處理而形成之方法。作為該鍍覆處理,可例舉:可簡便形成金屬鍍覆層之電鍍法、無電解鍍覆法等濕式鍍覆法。又,亦可將該等鍍覆法組合2種以上。例如,亦可於實施無電解鍍覆後,實施電鍍而形成金屬鍍覆層。
無電解鍍覆法例如為:藉由使無電解鍍覆液與構成金屬粒子層之金屬接觸而使無電解鍍覆液中所含之銅等金屬析出而形成由金屬被膜所構成之無電解鍍覆層之方法。作為無電解鍍覆液,例如可例舉:含有銅、銀、金、鎳、鉻、鈷、錫等金屬、還原劑、及水性介質、有機溶劑等溶劑者。
作為還原劑,例如可例舉:二甲胺基硼烷、次磷酸、次磷酸鈉、二甲胺硼烷、肼、甲醛、硼氫化鈉、苯酚等。
作為無電解鍍覆液,可視需要使用含有下述成分者:乙酸、甲酸等單羧酸;丙二酸、琥珀酸、己二酸、順丁烯二酸、反丁烯二酸等二羧酸化合物;蘋果酸、乳酸、羥乙酸、葡萄糖酸、檸檬酸等羥基羧酸化合物;甘胺酸、丙胺酸、亞胺基二乙酸、精胺酸、天冬胺酸、麩胺酸等胺基酸化合物;亞胺基二乙酸、氮基三乙酸、乙二胺二乙酸、乙二胺四乙酸、二乙三胺五乙酸等胺基多羧酸化合物等有機酸、或該等有機酸之可溶性鹽(鈉鹽、鉀鹽、銨鹽等)、乙二胺、二乙三胺、三乙四胺等胺化合物等錯合劑。
電鍍法例如為以下方法,即,藉由使構成金屬粒子層之金屬、或藉由無電解處理所形成之無電解鍍覆層(被膜)之表面於與電鍍液接觸之狀態下進行通電,而使電鍍液中所含之銅等金屬析出至「設置於陰極之構成金屬粒子層之金屬粒子或藉由無電解處理所形成之無電解鍍覆層之表面」,從而形成電鍍層。
作為電鍍液,例如可例舉:含有銅、鎳、鉻、鈷、錫等金屬之硫化物、硫酸、及水性介質者等。具體而言,可例舉:含有硫酸銅、硫酸及水性介質者。
作為金屬鍍覆層之形成方法,就容易將金屬鍍覆層之膜厚控制在薄膜至厚膜之所需之膜厚之方面而言,較佳為在實施無電解鍍覆後實施電鍍之方法。
金屬鍍覆層之膜厚較佳為1~50 μm。金屬鍍覆層之膜厚可藉由如下方式調整,即,對形成金屬鍍覆層時之鍍覆處理步驟中之處理時間、電流密度、鍍覆用添加劑之使用量等進行控制。
<積層體之用途>
關於本發明之積層體,形成於表面之金屬鍍覆層不僅在常態下不會剝離,於在150℃之高溫下長時間放置之情形時,亦可維持金屬鍍覆層之密合性。因此,可較佳用於:電子電路、積體電路等中所使用之電路形成用基板之形成、構成有機太陽電池、電子書終端、有機EL、有機電晶體、軟性印刷基板、RFID等之周邊配線之形成、電漿顯示器之電磁波屏蔽之配線等中之特別是要求耐久性之用途。特別是,由於實施了上述鍍覆處理之導電性圖案可於長期不會引起斷線等之情況下,形成可維持良好通電性之可靠性較高之配線圖案,故而可用於例如軟性印刷配線板(FPC)或電磁波屏蔽等電子機器用途。
作為本發明之實施方式,對支持體之一個面依次具備底塗層、金屬粒子層及金屬鍍覆層之積層體進行例示並說明,作為本發明之另一實施方式,可設為支持體之相反側之面亦依次具備底塗層、金屬粒子層及金屬鍍覆層之積層體。
實施例
以下,藉由實施例更加具體地說明本發明,但本發明並不限於實施例。再者,以下記載為「份」及「%」者只要沒有特別說明,則全部為質量基準。
[實施例1]
<底塗層形成用塗佈液之製備>
於安裝有溫度計、冷凝管、分留管、攪拌器之燒瓶中加入苯酚750質量份、三聚氰胺75質量份、41.5質量%福馬林346質量份、及三乙胺1.5質量份,一面注意發熱,一面升溫至100℃。於回流下、100℃下反應2小時後,一面於常壓下去除水,一面耗時2小時升溫至180℃。其次,於減壓下去除未反應之苯酚,獲得胺基三改質酚醛清漆樹脂。羥基當量為120 g/當量。
於所獲得之胺基三改質酚醛清漆樹脂65質量份中混合環氧樹脂(DIC股份有限公司製造之「EPICLON 850-S」;雙酚A型環氧樹脂,環氧基當量188 g/當量)35質量份後,藉由甲基乙基酮以不揮發分成為2質量%之方式進行稀釋,將之均勻混合,藉此獲得胺基三改質酚醛清漆樹脂與環氧樹脂之混合樹脂溶液。
<金屬粒子層形成用塗佈液(M-1)之製備>
於氮氣環境下,將包含對甲苯磺醯氯9.6質量份之氯仿(30 ml)溶液於冰浴冷卻下進行攪拌,並耗時30分鐘將其滴下至包含甲氧基聚乙二醇(數量平均分子量2,000)20質量份、吡啶8.0質量份及氯仿20 ml之混合物中,其後,於浴槽溫度40℃攪拌4小時,混合氯仿50 ml。
其次,藉由5質量%鹽酸水溶液100 ml洗淨所獲得之產物,其次藉由飽和碳酸氫鈉水溶液100 ml進行洗淨,其次藉由飽和食鹽水溶液100 ml進行洗淨,其後使用無水硫酸鎂進行乾燥、過濾、減壓濃縮,藉由己烷洗淨數次後進行過濾,於80℃進行減壓乾燥,藉此獲得具有對甲苯磺醯氧基之甲氧基聚乙二醇。
將具有對甲苯磺醯氧基之甲氧基聚乙二醇5.39質量份、聚伸乙基亞胺(Aldrich公司製造,分子量25,000)20質量份、碳酸鉀0.07質量份及N,N-二甲基乙醯胺100 ml加以混合,於氮氣環境下,於100℃攪拌6小時。
其次,加入乙酸乙酯與己烷之混合溶液(乙酸乙酯/己烷之體積比=1/2)300 ml,於室溫進行強力攪拌後,過濾產物之固形物。使用乙酸乙酯與己烷之混合溶液(乙酸乙酯/己烷之體積比=1/2)100 ml對該固形物進行洗淨後,進行減壓乾燥,藉此獲得在聚伸乙基亞胺鍵結有聚乙二醇之化合物。
將包含所獲得之在聚伸乙基亞胺鍵結有聚乙二醇之化合物0.592質量份之水溶液138.8質量份、氧化銀10質量份加以混合,於25℃攪拌30分鐘。其次,攪拌二甲基乙醇胺46質量份,並同時將之緩緩添加,於25℃攪拌30分鐘。繼而,攪拌10質量%抗壞血酸水溶液15.2質量份,並同時將之緩緩添加,持續攪拌20小時,藉此獲得銀之分散體。
於所獲得之銀之分散體中加入異丙醇200 ml與己烷200 ml之混合溶劑,攪拌2分鐘後,於3000 rpm進行5分鐘離心濃縮。去除上清液後,於沈澱物中加入異丙醇50 ml與己烷50 ml之混合溶劑,攪拌2分鐘後,以3000 rpm進行5分鐘離心濃縮。去除上清液後,於沈澱物中進而加入水20質量份攪拌2分鐘,於減壓下去除有機溶劑。進而加入水10質量份進行攪拌分散後,將該分散體於-40℃之冷凍機中放置1個晝夜進行冷凍,藉由冷凍乾燥機(東京理化器械股份有限公司製造之FDU-2200)對其處理24小時,藉此獲得由有灰綠色金屬光澤之鱗片狀之塊所構成之陽離子性銀粒子。
使所獲得之陽離子性銀粒子之粉末分散於乙二醇45質量份與離子交換水55質量份之混合溶劑中,製備含5質量%之陽離子性銀粒子之塗佈液。
其次,於含陽離子性銀粒子之塗佈液100質量份中添加作為環氧樹脂之3',4'-環氧環己基甲基-3,4-環氧環己烷羧酸酯(大賽璐股份有限公司製造之Celloxide 2021P,固形物成分100質量%)0.075質量份進行攪拌,藉此製備金屬粒子層形成用塗佈液(M-1)。
<積層體之製作>
使用桌上型小型塗佈機(K Printing Proofer,RK Print Coat Instruments股份有限公司),以乾燥後之塗膜厚成為300 nm之方式將上述所獲得之底塗層形成用塗佈液塗佈於聚醯亞胺膜(東麗杜邦股份有限公司製造之「Kapton 150EN-A」;厚度38 μm)之表面。其次,使用熱風乾燥機,於155℃乾燥5分鐘,藉此於聚醯亞胺膜之表面形成底塗層。
繼而,使用棒式塗佈機,以乾燥後之塗膜厚成為100 nm之方式將上述所獲得之金屬粒子層形成用塗佈液(M-1)塗佈於底塗層之表面。其次,於140℃乾燥5分鐘,藉此形成金屬粒子層。
將如上所述形成之金屬粒子層設定在陰極側,將含磷銅設定在陽極側,使用含有硫酸銅之電鍍液,以電流密度2 A/dm
2進行18分鐘電鍍,藉此在金屬粒子層上形成銅鍍覆層(膜厚8 μm)。作為電鍍液,使用硫酸銅70 g/L、硫酸200 g/L、氯離子50 mg/L、添加劑(Top Lucina SF-M,奧野製藥工業股份有限公司)5 ml/L。
如此,獲得依次積層有支持體、底塗層、金屬粒子層、及金屬鍍覆層之積層體。
[實施例2]
於金屬粒子層形成用塗佈液(M-1)之製備中,將環氧樹脂之添加量設為0.15質量份,除此以外,以與實施例1相同之方式製作積層體。
[實施例3]
於金屬粒子層形成用塗佈液(M-1)之製備中,將環氧樹脂之添加量設為0.23質量份,除此以外,以與實施例1相同之方式製作積層體。
[實施例4]
於金屬粒子層形成用塗佈液(M-1)之製備中,將環氧樹脂之添加量設為0.3質量份,除此以外,以與實施例1相同之方式製作積層體。
[實施例5]
於金屬粒子層形成用塗佈液(M-1)之製備中,添加0.15質量份之己內酯改質ε-3',4'-環氧環己基甲基-3,4-環氧環己烷羧酸酯(Celloxide 2081,固形物成分100質量%,大賽璐股份有限公司)作為環氧樹脂,除此以外,以與實施例1相同之方式製作積層體。
[實施例6]
於金屬粒子層形成用塗佈液(M-1)之製備中,添加0.15質量份之脂環式環氧樹脂(Celloxide 8010,固形物成分100質量%,大賽璐股份有限公司)作為環氧樹脂,除此以外,以與實施例1相同之方式製作積層體。
[實施例7]
於金屬粒子層形成用塗佈液(M-1)之製備中,添加0.15質量份之2-乙基己基縮水甘油醚(Nagase chemteX股份有限公司之Denacol EX-121,固形物成分100質量%)作為環氧樹脂,除此以外,以與實施例1相同之方式製作積層體。
[實施例8]
於金屬粒子層形成用塗佈液(M-1)之製備中,添加0.15質量份之新戊二醇二縮水甘油醚(Nagase chemteX股份有限公司之Denacol EX-211,固形物成分100質量%)作為環氧樹脂,除此以外,以與實施例1相同之方式製作積層體。
[實施例9]
於金屬粒子層形成用塗佈液(M-1)之製備中,添加0.15質量份之氫化雙酚A二縮水甘油醚(Nagase chemteX股份有限公司之Denacol EX-252,固形物成分100質量%)作為環氧樹脂,除此以外,以與實施例1相同之方式製作積層體。
[實施例10]
於金屬粒子層形成用塗佈液(M-1)之製備中,添加0.15質量份之三羥甲基丙烷聚縮水甘油醚(Nagase chemteX股份有限公司之Denacol EX-321,固形物成分100質量%)作為環氧樹脂,除此以外,以與實施例1相同之方式製作積層體。
[實施例11]
於金屬粒子層形成用塗佈液(M-1)之製備中,添加0.15質量份之聚乙二醇二縮水甘油醚(Nagase chemteX股份有限公司之Denacol EX-830,固形物成分100質量%)作為環氧樹脂,除此以外,以與實施例1相同之方式製作積層體。
[比較例1]
於金屬粒子層形成用塗佈液(M-1)之製備中,未摻合環氧樹脂,除此以外,以與實施例1相同之方式製作積層體。
[比較例2]
使用如下所述製備之金屬粒子層形成用塗佈液(M-2)代替金屬粒子層形成用塗佈液(M-1),除此以外,以與實施例1相同之方式製作積層體。
<金屬粒子層形成用塗佈液(M-2)之製備>
將銀粉(福田金屬箔工業股份有限公司製造之AgC-A)100質量份、飽和聚酯樹脂(Toyobo股份有限公司製造之Vylon 500,分子量:23,000)10質量份加以混合後,藉由三輥輥磨機使之充分分散。其後,藉由甲基乙基酮以稀釋不揮發分成為5質量%之方式進行稀釋,使之均勻混合,藉此製備將聚酯樹脂作為分散劑之金屬粒子塗佈液。其後,於將聚酯樹脂作為分散劑之金屬粒子塗佈液100質量份中添加作為環氧樹脂之3',4'-環氧環己基甲基-3,4-環氧環己烷羧酸酯(大賽璐股份有限公司製造之Celloxide 2021P,固形物成分100質量%)0.075質量份進行攪拌,藉此製備金屬粒子層形成用塗佈液(M-2)。
<密合性評價(常態時)>
關於上述所獲得之各積層體,於室溫環境下,使用Nordson DAGE公司製造之4000Plus測定剝離強度。再者,測定中所使用之引線寬為5 mm,其剝離角度為90°。又,有金屬鍍覆層之厚度越厚,剝離強度表現越高值之趨勢,於本說明書中,剝離強度之測定係以金屬鍍覆層之厚度8 μm中之測定值作為基準進行實施。
根據所測得之加熱前之剝離強度之值,依據下述基準評價密合性。
A:剝離強度之值為600 N/m以上。
B:剝離強度之值為450 N/m以上且未達600 N/m。
C:剝離強度之值為250 N/m以上且未達450 N/m。
D:剝離強度之值未達250 N/m。
評價結果如下述表1所示。
<密合性評價(長期耐熱試驗)>
關於上述所獲得之各積層體,於分別設定在150℃之乾燥機內保管並加熱300小時。加熱後,使各積層體冷卻至室溫,藉由與上述相同之方法測定剝離強度。
使用所測得之加熱前後之剝離強度值,計算加熱前後之保持率,依據下述基準評價耐熱性之保持程度。
A:保持率為80%以上。
B:保持率為60%以上且未達80%。
C:保持率為30%以上且未達60%。
D:保持率未達30%。
評價結果如下述表1所示。
[表1]
環氧樹脂摻合量 (質量%) | 密合性評價 | |||||
常態時 | 長期耐熱試驗後 | 長期耐熱試驗後/常態時之保持率 (%) | ||||
剝離強度 (N/m) | 密合性 | 剝離強度 (N/m) | 保持程度 | |||
實施例1 | 1.5 | 590 | B | 400 | B | 68 |
實施例2 | 3 | 600 | A | 480 | A | 80 |
實施例3 | 4.5 | 600 | A | 420 | B | 70 |
實施例4 | 6 | 630 | A | 200 | C | 32 |
實施例5 | 3 | 620 | A | 410 | B | 66 |
實施例6 | 3 | 530 | B | 300 | C | 57 |
實施例7 | 3 | 520 | B | 380 | B | 73 |
實施例8 | 3 | 520 | B | 300 | C | 58 |
實施例9 | 3 | 510 | B | 410 | A | 80 |
實施例10 | 3 | 620 | A | 230 | C | 37 |
實施例11 | 3 | 520 | B | 250 | C | 48 |
比較例1 | 0 | 610 | A | 50 | D | 8 |
比較例2 | 1.5 | 300 | C | 30 | D | 10 |
根據表1所示之密合性評價結果亦可明確,在金屬粒子層中添加有環氧樹脂之積層體(實施例1~11)在常態時之剝離強度均為450 N/m以上,即便於長期耐熱試驗後,亦具有常態時之剝離強度之30%以上之保持率。即,可知,不論常態時還是長期耐熱試驗後,密合性評價均優異。
相對於此,於在金屬粒子層中不含環氧樹脂之積層體(比較例1)中,雖常態時之剝離強度較高,但長期耐熱試驗後之保持率未達30%,不具有穩定之密合性。即,可知,與實施例相比,長期耐熱試驗後之密合性評價較差。又,在金屬粒子層中不含具有陽離子性基之化合物之積層體(比較例2)即便在金屬粒子層中包含環氧樹脂,不僅常態時之剝離強度之值稍有不足為250 N/m以上且未達450 N/m,長期耐熱試驗後之保持率亦未達30%。即,可知,與實施例相比,不論常態時還是長期耐熱試驗後,密合性評價均較差。
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Claims (10)
- 一種積層體,其具備支持體、及於上述支持體依次配置之底塗層、金屬粒子層及金屬鍍覆層,且上述金屬粒子層包含金屬粒子、具有含鹼性氮原子之基之化合物、及環氧樹脂。
- 如請求項1之積層體,其中,於上述金屬粒子層中,相對於金屬粒子100質量份,包含0.1質量份以上且10質量份以下之上述環氧樹脂。
- 如請求項1之積層體,其中,上述環氧樹脂為脂肪族環氧樹脂。
- 如請求項3之積層體,其中,上述環氧樹脂為脂環式環氧樹脂。
- 如請求項1之積層體,其中,上述金屬粒子層中,相對於金屬粒子100質量份包含0.01質量份以上且50質量份以下之上述具有含鹼性氮原子之基的化合物。
- 如請求項1之積層體,其中,上述支持體由可撓性樹脂材料構成。
- 如請求項1至7中任一項之積層體,其用於電子機器。
- 如請求項8之積層體,其中,電子機器選自印刷配線板及電磁波屏蔽。
- 一種電子機器,其具備請求項1至7中任一項之積層體。
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