JP2018140628A - カラー薄型カバーレイフィルムおよびその製造方法 - Google Patents
カラー薄型カバーレイフィルムおよびその製造方法 Download PDFInfo
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Abstract
【解決手段】上部離型層100、カラーインク層200、低誘電接着剤層300および下部離型層400とを含み、カラーインク層200は上部離型層100と低誘電接着剤層300との間に位置し、低誘電接着剤層300はカラーインク層200と下部離型層400との間に位置し、カラーインク層200の厚さは1〜10μmであり、低誘電接着剤層300の厚さは3〜25μmであり、カラーインク層200と低誘電接着剤層300との合計厚さは4〜35μmであるカラー薄型カバーレイフィルム。
【選択図】図1
Description
その一、本発明は、低誘電接着剤層を採用しており、当該低誘電接着剤層はDk値が2.4〜2.8であり、Df値が0.002〜0.006であり、Dk/Df値が低いので、伝送過程における信号損失を減らし、信号伝送品質をより高めることができ、FPCの高周波数・高速化、熱放散・熱伝導の快速化、および生産コストの最小化への要求を完全に満足することができる。
その二、本発明の低誘電接着剤層の配合処方は、焼結シリカ、テフロン、フッ素系樹脂、リン系難燃剤およびポリイミド樹脂を含有するので、より低い吸水率(0.05〜0.2%)を有し、吸水後の性能が安定して、良好な電気性能を有し、信号伝送の挿入損失を減らすことができる。
その三、本発明の低誘電接着剤層は、極めて低い、かつ高温高湿環境下で安定したDk/Df値を有するので、本発明は、低温(190℃より低い)での硬化に適し、プロセス加工性が強く、また、製造設備に対する要求が低いため、生産コストを下げることができる。
その四、本発明のカラー薄型カバーレイフィルムは、より低い反発力を有し、下流の高密度実装プロセスに適する。
その五、本発明のカラーインク層と低誘電接着剤層との合計厚さは、最も低い場合は4〜7μmに達することができ、現在のFPCの微細配線化された回路のデザインの要求を満足する。
200 カラーインク層
201 第1カラーインク層
202 第2カラーインク層
300 低誘電接着剤層
400 下部離型層
Claims (10)
- 上部離型層、カラーインク層、低誘電接着剤層および下部離型層を含むカラー薄型カバーレイフィルムであって、
前記カラーインク層は、前記上部離型層に形成され、前記カラーインク層の厚さが1〜10μmであり、
前記低誘電接着剤層は、前記カラーインク層に形成され、前記カラーインク層を前記上部離型層と低誘電接着剤層の間に位置させ、前記低誘電接着剤層の厚さが3〜25μmであり、前記カラーインク層と前記低誘電接着剤層との合計厚さが4〜35μmであり、
前記下部離型層は、前記低誘電接着剤層に形成され、前記低誘電接着剤層を前記カラーインク層と離型層との間に位置させる、
カラー薄型カバーレイフィルム。 - 前記低誘電接着剤層は、Dk値が2.4〜2.8(10GHz)であり、Df値が0.002〜0.006(10GHz)であり、吸水率が0.05〜0.2%であり、線間絶縁抵抗が1011Ωより大きく、表面抵抗が1012Ωより大きく、体積抵抗が1013Ω・cmより大きい、請求項1に記載のカラー薄型カバーレイフィルム。
- 前記低誘電接着剤層を形成する材料は、フッ素系樹脂、エポキシ樹脂、アクリル系樹脂、ウレタン系樹脂、シリコーンゴム系樹脂、ポリパラキシリレン系樹脂、ビスマレインイミド系樹脂、ポリイミド樹脂、ポリアミドイミドおよびポリアミド樹脂からなる群から選択される少なくとも1種の樹脂を含む、請求項1に記載のカラー薄型カバーレイフィルム。
- 前記低誘電接着剤層は、焼結シリカ、テフロン、フッ素系樹脂、リン系難燃剤およびポリイミド樹脂を含み、
前記焼結シリカ、前記テフロン、前記フッ素系樹脂および前記リン系難燃剤の合計含有量は、前記低誘電接着剤層の総固形分含有量の8〜50重量%であり、
前記ポリイミド樹脂の含有量は、前記低誘電接着剤層の総固形分含有量の40〜90重量%である、請求項1に記載のカラー薄型カバーレイフィルム。 - 前記カラーインク層を形成する材料は、エポキシ樹脂、アクリル系樹脂、ウレタン系樹脂、シリコーンゴム系樹脂、ポリパラキシリレン系樹脂、ビスマレインイミド系樹脂、ポリイミド樹脂、ポリアミドイミドおよびポリアミド樹脂からなる群から選択される少なくとも1種の樹脂を含む、請求項1に記載のカラー薄型カバーレイフィルム。
- 前記上部離型層と前記下部離型層を形成する材料は、それぞれ独立して、ポリプロピレン、二軸延伸ポリプロピレンおよびポリエチレンテレフタレートからなる群から選択される少なくとも1種の重合体である、請求項1に記載のカラー薄型カバーレイフィルム。
- 前記焼結シリカの含有量は、前記低誘電接着剤層の総固形分含有量の2〜15重量%であり、
前記テフロンの含有量は、前記低誘電接着剤層の総固形分含有量の2〜10重量%であり、
前記フッ素系樹脂の含有量は、前記低誘電接着剤層の総固形分含有量の2〜10重量%であり、
前記リン系難燃剤の含有量は、前記低誘電接着剤層の総固形分含有量の2〜15重量%である、
請求項4に記載のカラー薄型カバーレイフィルム。 - 前記カラーインク層は、無機顔料または有機顔料を含み、
前記無機顏料は、カドミウムレッド、カドミウムレモンイエロー、カドミウムイエローオレンジ、二酸化チタン、カーボンブラック、黒色酸化鉄または黒色錯体無機顏料であり、
前記有機顏料は、アニリンブラック、ペリレンブラック、アントラキノンブラック、ベンジジン系黄色顏料、フタロシアニンブルーまたはフタロシアニングリーンである、
請求項1に記載のカラー薄型カバーレイフィルム。 - 前記カラーインク層の厚さは3〜5μmであり、前記低誘電接着剤層の厚さは3〜10μmである、請求項1に記載のカラー薄型カバーレイフィルム。
- 上部離型層の下表面にカラーインク原料を塗布して、50〜180℃で前記カラーインク原料を硬化させ、カラーインク層を形成する工程、
塗布法または転写法により、低誘電接着剤層を前記カラーインク層の下表面に形成する工程、および
下部離型層を前記低誘電接着剤層の下表面に貼り覆う工程
を含む、請求項1に記載のカラー薄型カバーレイフィルムの製造方法。
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