JPWO2018186223A1 - 金属張積層板およびその製造方法 - Google Patents
金属張積層板およびその製造方法 Download PDFInfo
- Publication number
- JPWO2018186223A1 JPWO2018186223A1 JP2019511164A JP2019511164A JPWO2018186223A1 JP WO2018186223 A1 JPWO2018186223 A1 JP WO2018186223A1 JP 2019511164 A JP2019511164 A JP 2019511164A JP 2019511164 A JP2019511164 A JP 2019511164A JP WO2018186223 A1 JPWO2018186223 A1 JP WO2018186223A1
- Authority
- JP
- Japan
- Prior art keywords
- metal
- liquid crystal
- crystal polymer
- polymer film
- clad laminate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- 229910052802 copper Inorganic materials 0.000 description 16
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- 125000003118 aryl group Chemical group 0.000 description 14
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- 230000000052 comparative effect Effects 0.000 description 11
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- RXOHFPCZGPKIRD-UHFFFAOYSA-N naphthalene-2,6-dicarboxylic acid Chemical compound C1=C(C(O)=O)C=CC2=CC(C(=O)O)=CC=C21 RXOHFPCZGPKIRD-UHFFFAOYSA-N 0.000 description 2
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- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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Abstract
Description
本発明の別の目的は、良好な伝送特性を達成できる金属張積層板を提供することにある。
本発明のさらに別の目的は、ロールツーロール方式で連続的に長時間製造した場合であっても、熱可塑性液晶ポリマーフィルム表面の表面平滑性に優れる金属張積層板を効率よく製造する製造方法を提供することにある。
〔態様1〕
熱可塑性液晶ポリマーフィルムと金属シートとが少なくとも積層された金属張積層板であって、金属シートとの接合面とは反対側の熱可塑性液晶ポリマーフィルム表面が、JIS Z 8741に基づく光沢度(20°)において55以上(好ましくは60以上、より好ましくは65以上)である、金属張積層板。
〔態様2〕
態様1に記載の金属張積層板であって、熱可塑性液晶ポリマーフィルムの融点が290℃以上(好ましくは300℃〜400℃、より好ましくは315℃〜380℃)である、金属張積層板。
〔態様3〕
態様1または2に記載の金属張積層板であって、さらに、前記熱可塑性液晶ポリマー表面に形成された金属蒸着層を備える、金属張積層板。
〔態様4〕
態様1〜3のいずれか一態様に記載の金属張積層板であって、長手方向において、100m以上の長さを有する、金属張積層板。
〔態様5〕
ロールツーロール方式により、熱可塑性液晶ポリマーフィルムの表面に金属シートが接合された金属張積層板の製造方法であって、
熱可塑性液晶ポリマーフィルムと金属シートとを準備する工程と、
前記熱可塑性液晶ポリマーフィルムと前記金属シートとを一対の加熱ロール間に導入し、前記熱可塑性液晶ポリマーフィルムと前記金属シートとを前記一対の加熱ロール間で圧着させる工程と、
を少なくとも備え、
前記一対の加熱ロールは、前記熱可塑性液晶ポリマーフィルムと接する側に金属弾性ロールを少なくとも備え、前記金属弾性ロールは、表面の十点平均粗さRzが0.2μm以下(例えば、0.01〜0.2μm)である、金属張積層板の製造方法。
〔態様6〕
態様5に記載の金属張積層板の製造方法において、前記一対の加熱ロールが、金属ロールと金属弾性ロールで構成される、金属張積層板の製造方法。
〔態様7〕
態様6に記載の金属張積層板の製造方法において、前記金属ロールが、内部加熱式の金属ロールである、金属張積層板の製造方法。
〔態様8〕
態様5〜7のいずれか一態様に記載の金属張積層板の製造方法において、前記金属弾性ロールが、ロール状の耐熱性ゴムと、その周囲に形成された金属表面層とで構成されている、金属張積層板の製造方法。
〔態様9〕
態様8に記載の金属張積層板の製造方法において、前記耐熱性ゴムの硬度が70〜100であり、金属表面層の厚みが100〜1000μmである、金属張積層板の製造方法。
〔態様10〕
態様1〜4のいずれか一態様に記載の金属張積層板に、回路面が形成されている、回路基板。
〔態様11〕
態様10に記載の回路基板であって、前記回路パターンが、熱可塑性液晶ポリマーフィルム表面または金属蒸着層表面に形成されている、回路基板。
本発明の一実施形態は、ロールツーロール方式により、熱可塑性液晶ポリマーフィルムの表面に金属シートが接合された金属張積層板の製造方法である。前記製造方法は、熱可塑性液晶ポリマーフィルムと金属シートとを準備する工程と、前記熱可塑性液晶ポリマーフィルムおよび前記金属シートを一対の加熱ロール間に導入し、前記熱可塑性液晶ポリマーフィルムおよび前記金属シートを加熱ロール間で圧着させる工程と、を少なくとも含んでいる。
熱可塑性液晶ポリマーフィルムは、溶融成形できる液晶性ポリマーから形成される。この熱可塑性液晶ポリマー(単に液晶ポリマーと称する場合がある)は、溶融成形できる液晶性ポリマーであれば特にその化学的構成については特に限定されるものではないが、例えば、熱可塑性液晶ポリエステル、又はこれにアミド結合が導入された熱可塑性液晶ポリエステルアミドなどを挙げることができる。
金属シート(以下、金属箔と称する場合もある。)は、金属張積層板において、熱可塑性液晶ポリマーフィルムの片面に積層される。本発明の金属箔の材料としては、特に制限はなく、例えば、銅、金、銀、ニッケル、アルミニウム、及びステンレスなどを挙げることができ、導電性、取り扱い性、及びコスト等の観点から、銅箔やステンレス箔を使用することが好ましく、特に銅箔が好ましく用いられる。銅箔は、回路基板において用い得る銅箔であれば、特に限定されず、圧延銅箔、電解銅箔のいずれであってもよい。
本発明にかかる製造方法は、熱可塑性液晶ポリマーフィルムおよび金属シートの熱圧着工程を備え、前記熱圧着工程では、熱可塑性液晶ポリマーフィルムおよび金属シートを一対の加熱ロール間に導入し、両者を圧着させる工程を備えている。
また、所定の熱処理温度Taでの熱処理時間(ロールツーロール方式の場合は、任意の1点が、熱処理温度Taを通過する時間)は、1秒〜10分が好ましく、より好ましくは5秒〜8分であり、さらに好ましくは8秒〜5分であってもよく、特に好ましくは8秒〜3分である。
本発明にかかる製造方法は、さらに、片面金属張積層板の熱可塑性液晶ポリマーフィルム表面に対して、金属を蒸着させる金属蒸着工程を備えていてもよい。生産効率を高める観点から、金属蒸着工程についても、ロールツーロール方式で行われることが好ましい。その場合、蒸着用チャンバー内において、片面金属張積層板の金属シート面が蒸着用加熱ロールに接触するように、片面金属張積層板を蒸着用加熱ロールに導入し、蒸着用加熱ロール状で、熱可塑性液晶ポリマーフィルム面に対して、金属蒸着層を形成する。
本発明の一態様である金属張積層板は、熱可塑性液晶ポリマーフィルムと金属シートとが少なくとも積層された金属張積層板であって、金属シートとの接合面とは反対側の熱可塑性液晶ポリマーフィルム表面が、JIS Z 8741に基づく光沢度(20°)において55以上である、金属張積層板である。ここで、金属張積層板が、前記光沢度を有する熱可塑性液晶ポリマーフィルム表面に金属蒸着層を備えている場合、金属蒸着層をエッチング除去することにより、熱可塑性液晶ポリマーフィルム表面の光沢度を確認してもよい。
光沢度保持率=(60分連続運転後の光沢度/運転直後の光沢度)×100
ここで、「運転直後の光沢度」とは、ロールツーロール方式による運転を開始した直後に得られた積層体サンプルの熱可塑性液晶ポリマーフィルム表面の光沢度であり、「60分連続運転後の光沢度」は、60分間連続運転した後に得られた積層体サンプルの熱可塑性液晶ポリマーフィルム表面の光沢度である。
本発明の一態様である回路基板は、前記金属張積層板に、回路面が形成されている回路基板である。回路面は、公知のサブトラクティブ法、アディティブ法、セミアディティブ法などにより形成することができる。回路(金属層)の厚みは、例えば、10〜14μmであってもよく、好ましくは11〜13μmであってもよい。
回路面は、好ましくは熱可塑性液晶ポリマーフィルム面または金属蒸着層面に形成されていてもよい。または、金属蒸着層に対して、さらに金属メッキ層を形成し、前記金属メッキ面に回路面を形成してもよい。
JIS Z 8741に準じて、サンプルを平坦な机の上に置き、入射角20°でのサンプルの光沢度(グロス度)を光沢度計(スガ機械株式会社製「GC-1」)で測定した。なお、光沢度計の較正は、付属の較正板を用いて行った。
誘電率測定は周波数10GHzで共振摂動法により実施した。マイクロ波ネットワークアナライザ(Agilent社製)に40〜67GHz対応プローブを接続し、40GHzおよび60GHzで伝送損失を測定した。
表面粗さは、JIS B0601:1994に準じ、接触式表面粗さ計(ミツトヨ(株)製、型式:SJ−201)を用いて十点平均粗さ(Rz)を測定した。より詳細には、十点平均粗さ(Rz)は、粗さ曲線から、その平均線の方向に基準長さを抜き取り、最高から5番目までの山頂(凸の頂点)の標高の平均値と、最深から5番目までの谷底(凹の底点)の標高の平均値との差をμmで表わした。
融点は、示差走査熱量計を用いて、フィルムの熱挙動を観察して得た。即ち、作製したフィルムを、20℃/分の速度で昇温して、完全に溶融させた後、溶融物を50℃/分の速度で50℃まで急冷し、再び20℃/分の速度で昇温した時に現れる吸熱ピークの位置を熱可塑性液晶ポリマーフィルムの融点とした。
融点は、熱機械分析装置を用いて、フィルムの熱挙動を観察して得た。即ち、作製したフィルムを、幅5mm長さ20mmの試験片として、チャック間距離15mmにて、引張荷重0.01N、昇温速度10℃/分の条件で試験片の長さ方向の熱膨張量を測定し、その変曲点を熱可塑性液晶ポリマーフィルムの熱変形温度とした。
(1)熱可塑性液晶ポリマーフィルムの作製
6−ヒドロキシ−2−ナフトエ酸単位(27モル%)、p−ヒドロキシ安息香酸単位(73モル%)からなるサーモトロピック液晶ポリエステルを、単軸押出機を用いて、280〜300℃で加熱混練した後、直径40mm、スリット間隔0.6mmのインフレーションダイより押出し、厚さ50μmの熱可塑性液晶ポリマーフィルムを得た。この熱可塑性液晶ポリマーフィルムの融点Tmは282℃、熱変形温度Tdefは230℃であった。
図1を参照しつつ、片面金属張積層板の作製を説明する。前記(1)で作製した熱可塑性液晶ポリマーフィルムと、12μm厚みの圧延銅箔(JX日鉱日石金属(株)製、商品名:BHYX−HA−V2、Rz:0.9μm)とを、それぞれ、熱可塑性液晶ポリマーフィルム2および金属シート6として用意した。一方、連続熱ロールプレス装置10に、積層用加熱ロール7として、金属弾性ロール8と、加熱金属ロール9とをそれぞれ取り付け、金属弾性ロール8側に熱可塑性液晶ポリマーフィルム2が、加熱金属ロール9側に金属シート6が接触するように導入し、熱可塑性液晶ポリマーフィルム2および金属シート6を熱圧着し、片面金属張積層板19を作製した。
図2を参照しつつ、銅蒸着層の形成を説明する。真空蒸着装置(ロック技研工業(株)製、商品名:RVC−W−300)を使用したロールツーロール方式を採用して、上記片面金属張積層板19の液晶ポリマーフィルム2面に銅蒸着層(厚み:0.3μm)を形成した。
作製した両面金属張積層板21を用いて、裏面に導体箔が形成された板状誘電体基板の表面に線状の導体箔が形成された構造を有し、電磁波を伝達する50Ωの伝送路(マイクロストリップライン)を作製した。
具体的には、両面金属張積層板21の金属蒸着面をシード層とし、その上にレジストのパターンを形成した後、電解銅めっきを行って回路を成長させた。その後、レジストを除去し、回路間のシード層をエッチングすることにより、厚みを12μmの回路パターンを形成した。さらに、スルーホールめっきを行うことにより、回路の厚みが30μmであるマイクロストリップ回路基板を作製し、その伝送特性を測定した。得られた結果を表7に示す。
(1)熱可塑性液晶ポリマーフィルムの作製
6−ヒドロキシ−2−ナフトエ酸単位(20モル%)、p−ヒドロキシ安息香酸単位(80モル%)からなるサーモトロピック液晶ポリエステルを、単軸押出機を用いて、350℃で加熱混練した後、直径40mm、スリット間隔0.6mmのインフレーションダイより押出し、厚さ50μmの熱可塑性液晶ポリマーフィルムを得た。この熱可塑性液晶ポリマーフィルムの融点Tmは325℃、熱変形温度Tdefは310℃であった。
(2)熱可塑性液晶ポリマーフィルムとして、前記(1)で得られた熱可塑性液晶ポリマーフィルムを使用し、加熱金属ロール5の表面温度を300℃とする以外は、実施例1と同様にして片面金属張積層板を作製した。その後、蒸着用加熱ロール13の設定温度を(Tm−15)℃(Tm:フィルム融点)とする以外は、実施例1と同様にして両面金属張積層板、マイクロストリップ回路基板を得た。各種物性を表7に示す。
実施例1および2の片面金属張積層板について、それぞれ、運転開始60分後に得られた片面金属張積層板に代えて、運転開始直後に製造された片面金属張積層板を用いる以外は、それぞれ実施例1および2と同様にして、両面金属張積層板、マイクロストリップ回路基板を得た。各種物性を表7に示す。
金属弾性ロールに代えて、耐熱性ゴムロール[樹脂被覆金属ロール(由利ロール機械(株)製、商品名:スーパーテンペックス、樹脂厚み:1.7cm)、直径:40cm]を使用する以外は、実施例1と同様にして片面金属張積層板を作製した。その後、実施例1と同様にして両面金属張積層板、マイクロストリップ回路基板を得た。各種物性を表7に示す。
金属弾性ロールに代えて、耐熱性ゴムロール[樹脂被覆金属ロール(由利ロール機械(株)製、商品名:スーパーテンペックス、樹脂厚み:1.7cm)、直径:40cm]を使用する以外は、実施例2と同様にして片面金属張積層板を作製した。その後、実施例2と同様にして両面金属張積層板、マイクロストリップ回路基板を得た。各種物性を表7に示す。
比較例1および2の片面金属張積層板について、それぞれ、運転開始60分後に得られた片面金属張積層板に代えて、運転開始直後に製造された片面金属張積層板を用いる以外は、それぞれ比較例1および2と同様にして、両面金属張積層板、マイクロストリップ回路基板を得た。各種物性を表7に示す。
さらに、このような高い光沢度を反映し、実施例1〜4で得られたマイクロストリップ回路基板の伝送損失は、40GHzおよび60GHzの双方において、比較例と比べて小さい値を示している。
6 金属シート
7 一対の加熱ロール
8 金属弾性ロール
9 加熱金属ロール
10 連続熱プレス装置
13 蒸着用加熱ロール
19 片面金属張積層板
21 両面金属張積層板
Claims (11)
- 熱可塑性液晶ポリマーフィルムと金属シートとが少なくとも積層された金属張積層板であって、金属シートとの接合面とは反対側の熱可塑性液晶ポリマーフィルム表面が、JIS Z 8741に基づく光沢度(20°)において55以上である、金属張積層板。
- 請求項1に記載の金属張積層板であって、熱可塑性液晶ポリマーフィルムの融点が290℃以上である、金属張積層板。
- 請求項1または2に記載の金属張積層板であって、さらに、前記熱可塑性液晶ポリマー表面に形成された金属蒸着層を備える、金属張積層板。
- 請求項1〜3のいずれか一項に記載の金属張積層板であって、長手方向において、100m以上の長さを有する、金属張積層板。
- ロールツーロール方式により、熱可塑性液晶ポリマーフィルムの表面に金属シートが接合された金属張積層板の製造方法であって、
熱可塑性液晶ポリマーフィルムと金属シートとを準備する工程と、
前記熱可塑性液晶ポリマーフィルムと前記金属シートとを一対の加熱ロール間に導入し、前記熱可塑性液晶ポリマーフィルムと前記金属シートとを前記一対の加熱ロール間で圧着させる工程と、
を少なくとも備え、
前記一対の加熱ロールは、前記熱可塑性液晶ポリマーフィルムと接する側に金属弾性ロールを少なくとも備え、前記金属弾性ロールは、表面の十点平均粗さRzが0.2μm以下である、金属張積層板の製造方法。 - 請求項5に記載の金属張積層板の製造方法であって、前記一対の加熱ロールが、金属ロールと金属弾性ロールで構成される、金属張積層板の製造方法。
- 請求項6に記載の金属張積層板の製造方法であって、前記金属ロールが、内部加熱式の金属ロールである、金属張積層板の製造方法。
- 請求項5〜7のいずれか一項に記載の金属張積層板の製造方法であって、前記金属弾性ロールが、ロール状の耐熱性ゴムと、その周囲に形成された金属表面層とで構成されている、金属張積層板の製造方法。
- 請求項8に記載の金属張積層板の製造方法であって、前記耐熱性ゴムの硬度が70〜100であり、金属表面層の厚みが100μm〜1000μmである、金属張積層板の製造方法。
- 請求項1〜4のいずれか一項に記載の金属張積層板に、回路パターンが形成されている、回路基板。
- 請求項10に記載の回路基板であって、前記回路パターンが、熱可塑性液晶ポリマーフィルム表面または金属蒸着層表面に形成されている、回路基板。
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CN114228169A (zh) * | 2021-12-21 | 2022-03-25 | 苏州东福来机电科技有限公司 | 一种高频柔性覆铜板的生产方法 |
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WO2018186223A1 (ja) | 2018-10-11 |
CN110461593B (zh) | 2021-11-02 |
JP7138623B2 (ja) | 2022-09-16 |
TWI787249B (zh) | 2022-12-21 |
KR102635625B1 (ko) | 2024-02-13 |
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