JP2020143362A - プリント回路板用の低伝送損失電解銅箔 - Google Patents
プリント回路板用の低伝送損失電解銅箔 Download PDFInfo
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- JP2020143362A JP2020143362A JP2020004658A JP2020004658A JP2020143362A JP 2020143362 A JP2020143362 A JP 2020143362A JP 2020004658 A JP2020004658 A JP 2020004658A JP 2020004658 A JP2020004658 A JP 2020004658A JP 2020143362 A JP2020143362 A JP 2020143362A
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- Prior art keywords
- copper foil
- treated
- layer
- range
- treated copper
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- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
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- C25D1/00—Electroforming
- C25D1/04—Wires; Strips; Foils
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Abstract
Description
電解銅箔の製造
電解銅箔を製造するためのシステムは、金属カソードドラム及び不溶性金属アノードを含む。前記金属カソードドラムは、回転可能であり、研磨表面を有する。このシステムにおいて、前記不溶性金属アノードは、金属カソードドラムのほぼ下半部に配置され、当該金属カソードドラムを囲む。連続的な電着を用いて電解銅箔を製造し、前記金属カソードドラムと前記不溶性金属アノードとの間に硫酸銅電解液を流させ、両者の間に電流を印加して、銅イオンを金属カソードドラムに吸引させて還元され、金属カソードドラムに銅を電着させることにより、電解銅箔を形成し、所定の厚さを得たとき、電解銅箔を金属カソードドラムから分離する。
銅線を硫酸水溶液(50wt%)に溶解させ、320g/Lの硫酸銅(CuSO4・5H2O)と95g/Lの硫酸とを含む硫酸銅電解質溶液を製造した。当該硫酸銅電解質溶液に30mg/Lの塩素イオン濃度を提供するように塩酸(RCI Labscan会社から取得)を添加した。0.5〜24.5mg/LのPEI(ポリエチレンイミン、線型、Mn=5000、Sigma−Aldrich社から購入)及び2〜10mg/Lのサッカリン(1,1−ジオキソ−1,2−ベンゾチアゾール−3−オン、Sigma−Aldrich社から購入)も添加した。
粗化処理の第1工程において、上記のように電解銅箔を製造した後、酸性溶液を使用して電解銅箔を洗浄した。その過程において、130g/Lの硫酸銅と50g/Lの硫酸とを含む電解質を充填した酸洗浄容器を使用し、当該溶液の温度を約27℃に維持した。電解銅箔を前記酸洗浄容器に導入し、当該電解質に30秒間浸漬することにより、表面の油、脂肪及び酸化物を除去した。次に、前記電解銅箔を水でリンスした。
表1には、上記のように特定の条件で製造された銅箔を示す。表1には、12つの実施例と8つの比較例が記載され、前記表面処理銅箔のいくつかの具体的な実施態様を例示的に説明する。表面処理銅箔について、良好な特性としては、剥離強度が約0.40N/mmを超え、加熱後の剥離強度減衰率が約35.0%未満であり、約−24.0dB/mより大きいという良好な伝送損失性能を有すると考えられる。実施例1〜12において、特定範囲のVmとYIは前記の良好な特性を提供することが確認されたが、それら以外、比較例1〜8に示されるように、これらの全ての特性を提供できなかった。実施態様を理解するのを助けるために、いくつかの特定の実施例及び比較例を検討する。また、特定範囲のVvを有する銅箔は、適切な剥離強度を有することができる。また、降伏強度を特定の範囲に制御することにより、表面処理銅箔の他の特性をさらに改善でき、例えば、約10mm未満のカール、及びシワの不形成であった。
・容積パラメータ
ISO25178−2(2012)に従って、レーザー顕微鏡の表面テクスチャ解析を使用することにより、銅箔の実体体積(Vm)と空隙容積(Vv)を測定した。前記レーザー顕微鏡は、Olympus社製のLEXTOLS5000−SAFであり、画像は、空気温度24±3℃及び相対湿度63±3%で作成された。
コニカミノルタ製の分光光度計CM−2500cを使用して黄色度指数を測定した。光源はD65であった。標準オブザーバー関数(Standard Observer Function)は2°であった。CIE 1931標準の標準オブザーバー関数を使用した。
IPC−TM−650 2.4.18の方法より、降伏強度の値を得た。実施例及び比較例の電解銅箔をそれぞれ切断し、サイズが100mm×12.7mm(長さ×幅)の試験サンプルが得られ、島津製作所(株)製のAG−I型試験機を用いて、チャック間距離が50mmであり、かつクロスヘッド速度が50mm/minである条件で、室温(約25℃)で前記試験サンプルを測定した。印加した力が0.075kgを超えた後に、測定値を記録し始めた。降伏強度(0.5%EUL)は、前記のひずみと応力との関係と類似する曲線において、ひずみが0.5%(ε=0.005)となる点のところで、Y軸に平行な直線(応力)を引くことにより得られた。
表面処理銅箔を樹脂基板(パナソニック株式会社のMegtron6)上に配置し、ノジュール層を有する処理層を樹脂基板と接触させた。続いて、前記銅箔と樹脂とをいずれも真空プレス機に置いた。使用されたラミネート条件としては、プレス圧力が30kg/cm2であり、温度が190℃であり、プレス時間が120分間であった。IPC−TM−650試験方法を使用して、剥離強度を評価した。
前記の剥離強度試験で述べたように、表面処理銅箔と樹脂を組み合わせて、ラミネート体を形成した。続いて、ラミネートサンプルを180℃のオーブンで48時間置いた。前記ラミネートサンプルが冷却した後、IPC−TM−650試験方法を使用して剥離強度を評価した。
ストリップライン(strip−line)技術を使用して伝送特性を評価した。樹脂に銅箔を貼り付け、さらにストリップラインに製造し、このストリップラインをソース電極として使用した。前記樹脂(SyTech社から取得したS7439G)の厚さは152.4μmであり、IPC−TM 650 No.2.5.5.5による10GHz信号試験では、誘電率(Dielectric Constant、Dk)=3.74、誘電損失(Dielectric Loss、Df)=0.006であった。前記ストリップラインは、長さが100mmであり、幅が120μmであり、厚さが18μmであった。
1000mm幅の表面処理銅箔に約30〜35kgfの張力を印加した。目視検査機により目視検査を行って、シワが発生するか否かを確認した。
この試験は、100mm×100mmの表面処理銅箔を机に置くことにより行われた。四角の高さを定規で測定し、最高値をカールの測定値とした。
102 電解銅箔
104 沈積面
106 ドラム面
108 処理層
110 表面処理面
112 ノジュール層
114 バリア層
116 防錆層
118 カップリング層
210 ピーク
212 谷
213 陰影領域
214 陰影領域
313 陰影領域
314 陰影領域
410 縦線
412 曲線
414 応力値
E−F 線
Z、A 点
Claims (15)
- ドラム面と沈積面とを含む電解銅箔、及び
前記沈積面に配置され、表面処理面を提供する処理層
を含む表面処理銅箔であって、
前記処理層は、ノジュール層を含み、
前記表面処理面は、0.05〜0.6μm3/μm2の範囲内にある実体体積(Vm)と、17〜52の範囲内にある黄色度指数(YI)とを有する、
表面処理銅箔。 - 前記表面処理面は、0.05〜0.5μm3/μm2の範囲内にある実体体積(Vm)を有する、請求項1に記載の表面処理銅箔。
- 前記表面処理面は、0.05〜0.3μm3/μm2の範囲内にある実体体積(Vm)を有する、請求項2に記載の表面処理銅箔。
- 前記表面処理面は、0.10〜0.85μm3/μm2の範囲内にある空隙容積(Vv)を有する、請求項1に記載の表面処理銅箔。
- 前記表面処理面は、0.39〜0.85μm3/μm2の範囲内にある空隙容積(Vv)を有する、請求項4に記載の表面処理銅箔。
- 前記表面処理面は、0.50〜0.85μm3/μm2の範囲内にある空隙容積(Vv)を有する、請求項4に記載の表面処理銅箔。
- 0.5%ひずみでの荷重延伸法に基づいて、8.5kg/mm2〜26kg/mm2の範囲内にある降伏強度を有する、請求項1に記載の表面処理銅箔。
- 0.5%ひずみでの荷重延伸法に基づいて、8.5kg/mm2〜20kg/mm2の範囲内にある降伏強度を有する、請求項7に記載の表面処理銅箔。
- 0.5%ひずみでの荷重延伸法に基づいて、8.5kg/mm2〜17kg/mm2の範囲内にある降伏強度を有する、請求項7に記載の表面処理銅箔。
- 前記処理層は、バリア層、防錆層及びカップリング層の少なくとも一つをさらに含む、請求項1に記載の表面処理銅箔。
- 前記バリア層は、金属又は前記金属を含む合金で製造されており、
前記金属は、Ni、Zn、Cr、Co、Mo、Fe、Sn及びVから選ばれる少なくとも一つである、請求項10に記載の表面処理銅箔。 - 前記カップリング層は、シリコンを含む、請求項10に記載の表面処理銅箔。
- 前記ノジュール層は、銅ノジュールを含む、請求項1に記載の表面処理銅箔。
- 樹脂層と表面処理銅箔とを含むラミネート体であって、
前記表面処理銅箔は、
ドラム面と沈積面とを有する電解銅箔、及び
前記沈積面に配置され、前記樹脂層と接触させる表面処理面を提供し、ノジュール層を含む処理層
を含み、
前記表面処理面は、0.05〜0.6μm3/μm2の範囲内にある実体体積(Vm)と、17〜52の範囲内にある黄色度指数(YI)と、0.10〜0.85μm3/μm2の範囲内にある空隙容積(Vv)とを有し、
前記表面処理銅箔は、0.5%ひずみでの荷重延伸法に基づいて、8.5kg/mm2〜26kg/mm2の範囲内にある降伏強度を有する、
ラミネート体。 - 請求項1に記載の表面処理銅箔を有する回路板と、前記回路板に取り付けられた複数の素子とを含む装置であって、
前記複数の素子の少なくとも一つの第一素子及び第二素子は、前記回路板の表面処理銅箔を介して、互いに電気的に接続される、
装置。
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