JP6076291B2 - 樹脂層薄膜化処理液の管理方法 - Google Patents
樹脂層薄膜化処理液の管理方法 Download PDFInfo
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- JP6076291B2 JP6076291B2 JP2014095057A JP2014095057A JP6076291B2 JP 6076291 B2 JP6076291 B2 JP 6076291B2 JP 2014095057 A JP2014095057 A JP 2014095057A JP 2014095057 A JP2014095057 A JP 2014095057A JP 6076291 B2 JP6076291 B2 JP 6076291B2
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- resin layer
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Description
(1)基板の表面に感光性樹脂層を形成する工程、樹脂層薄膜化処理液によって感光性樹脂層を薄膜化する工程をこの順に含む感光性樹脂層を薄膜化する方法における樹脂層薄膜化処理液の管理方法において、基板処理量に応じて第一補充液を定量補充する方法と、中和滴定法によって樹脂層薄膜化処理液の疲労度を求め、樹脂層薄膜化処理液の能力を所定の範囲内に保持するように第二補充液を補充する方法とを併用することを特徴とする樹脂層薄膜化処理液の管理方法、
(2)中和滴定法において、2つ以上の中和点から樹脂層薄膜化処理液の疲労度を求める上記(1)記載の樹脂層薄膜化処理液の管理方法。
(3)第一補充液が、未使用の樹脂層薄膜化処理液と同じ疲労度の処理液であり、第二補充液が未使用の樹脂層薄膜化処理液と同じ疲労度の処理液、水及び未使用の樹脂層薄膜化処理液を水で希釈した処理液からなる群から少なくとも一つ選ばれた補充液である上記(1)又は(2)記載の樹脂層薄膜化処理液の管理方法、
によって、上記課題を解決できることを見出した。
補充液B:水
補充液C:未使用の樹脂層薄膜化処理液を水で希釈した処理液
基準I:目標第一疲労度<第一疲労度、目標第二疲労度<第二疲労度→補充液A、B又はC
基準II:第一疲労度<目標第一疲労度、目標第二疲労度<第二疲労度→補充液A
基準III:第一疲労度<目標第一疲労度、第二疲労度<目標第二疲労度→補充液A
補充液B=0%
補充液C=希釈倍率に準じた値を用いる。例えば、希釈倍率が2倍の補充液では、疲労度50%とする。
銅張積層板(面積170mm×200mm、銅箔厚18μm、基材厚み0.4mm)にエッチングレジストを使用したサブトラクティブ法にて、導体配線幅80μm、導体配線間距離80μmを有する回路基板を作製した。次に、ドライフィルム状ソルダーレジスト(太陽インキ製造(株)製、商品名:PFR−800 AUS410)を上記回路基板表面に真空熱圧着させ(ラミネート温度75℃、吸引時間30秒、加圧時間10秒)、感光性樹脂層を形成した。回路基板表面における絶縁性基板表面から感光性樹脂層表面までの乾燥膜厚が35μmの感光性樹脂層を形成した。
第一疲労度が115%、第二疲労度が125%であった場合、第二補充液として補充液B(水)を選択した。第二補充量は14kgであった。補充後の第一疲労度計算値は101%であり、所定の範囲内であったため、14kgの補充液Bを補充した。補充後の処理槽内処理液に対して、中和滴定を行い、第一及び第二疲労度を算出したところ、第一疲労度が101%、第二疲労度が110%であり、両方の疲労度が所定の範囲内に戻った。
第一疲労度が75%、第二疲労度が115%であった場合、第二補充液として補充液Aを選択した。第二補充量は50kgであった。補充後の第一疲労度計算値は83%であり、所定の範囲を外れていたため、第一補充量を求めたところ、67kgであった。第一補充量と第二補充量とを合わせた量(50+67kg)の補充液Aを補充した後、中和滴定を行い、第一及び第二疲労度を算出したところ、第一疲労度が90%、第二疲労度が107%であり、両方の疲労度が所定の範囲内に戻った。
実施例1において、中和滴定において、第二中和点(pH8付近)のみで第二滴定量を測定し、第二疲労度を算出した。管理例2において、第二補充液として補充液Aを選択し、第二補充液の補充量である補充量50kgを補充した後、中和滴定を行い、第二疲労度を算出したところ、110%であった。このように、中和滴定において1つの中和点から疲労度を求めた以外は、実施例1と同様にして、10日間薄膜化処理を続けた結果、感光性樹脂層の薄膜化後の膜厚は、平均値より−3μm〜+3μmの範囲に広がっていた。カウンターフロー法と中和滴定で1つの中和点から疲労度を求めて第二補充液を補充する方法を併用して樹脂層薄膜化処理液の管理を行った実施例2よりも、カウンターフロー法と中和滴定で2つ以上の中和点から疲労度を求めて第二補充液を補充する方法を併用して樹脂層薄膜化処理液の管理を行った実施例1の方が、樹脂層薄膜化処理液の能力がより一定には保たれていた。
実施例1において、第一補充液の補充を行わなかった。また、中和滴定において、第二中和点(pH8付近)のみで第二滴定量を測定し、第二疲労度を算出した。管理例2において、第二補充液として補充液Aを選択し、第二補充液の補充量である50kgを補充した後、中和滴定を行い、第二疲労度を算出したところ、110%であった。また、処理槽中の樹脂層薄膜化処理液の液面が低下していた。このように、第一補充液の補充を行わず、中和滴定において1つの中和点から疲労度を求めた以外は、実施例1と同様にして、10日間薄膜化処理を続けた結果、感光性樹脂層の薄膜化後の膜厚は、平均値より−5μm〜+5μmの範囲に広がっていた。中和滴定で1つの中和点から疲労度を求めて第二補充液を補充する方法を用いて樹脂層薄膜化処理液の管理を行った比較例1よりも、カウンターフロー法と中和滴定で疲労度を求めて第二補充液を補充する方法を併用して樹脂層薄膜化処理液の管理を行った実施例1及び2の方が、樹脂層薄膜化処理液の能力がより一定に保たれていた。
Claims (3)
- 基板の表面に感光性樹脂層を形成する工程、樹脂層薄膜化処理液によって感光性樹脂層を薄膜化する工程をこの順に含む感光性樹脂層を薄膜化する方法における樹脂層薄膜化処理液の管理方法において、基板処理量に応じて第一補充液を定量補充する方法と、中和滴定法によって樹脂層薄膜化処理液の疲労度を求め、樹脂層薄膜化処理液の能力を所定の範囲内に保持するように第二補充液を補充する方法とを併用することを特徴とする樹脂層薄膜化処理液の管理方法。
- 中和滴定法において、2つ以上の中和点から樹脂層薄膜化処理液の疲労度を求める請求項1記載の樹脂層薄膜化処理液の管理方法。
- 第一補充液が、未使用の樹脂層薄膜化処理液と同じ疲労度の処理液であり、第二補充液が未使用の樹脂層薄膜化処理液と同じ疲労度の処理液、水及び未使用の樹脂層薄膜化処理液を水で希釈した処理液からなる群から少なくとも一つ選ばれた補充液である請求項1又は2記載の樹脂層薄膜化処理液の管理方法。
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