JP2013062379A - 熱伝導性シートおよびその製造方法 - Google Patents
熱伝導性シートおよびその製造方法 Download PDFInfo
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Abstract
【解決手段】熱伝導性シート1は、銅箔に対する剥離接着力が、2N/10mm以上であり、厚み方向TDの熱伝導率TC1が、4W/m・K以上であり、面方向PDの熱伝導率TC2が、20W/m・K以上であり、厚み方向TDの熱伝導率TC1に対する面方向PDの熱伝導率TC2の比(TC2/TC1)が、3以上である。
【選択図】図1
Description
MEHC−7800s(フェノール化合物、硬化剤、固体状、軟化点61〜89℃、水酸基当量173〜177g/eqiv.、明和化成(株)製)と、MEHC−7800ss(フェノール化合物、硬化剤、固体状、軟化点61〜89℃、水酸基当量173〜177g/eqiv.、明和化成(株)製)とを、重量比6:4で混合して、硬化剤混合物を調製した。
フィラーの配合処方を表2の記載に従って、変更した以外は、実施例1と同様に処理して、熱伝導性シートを得た。
AS−50:商品名、球状酸化アルミニウム粒子、平均粒子径(光散乱法)10μm、昭和電工(株)製
1. 密度
各実施例および各比較例において得られた熱伝導率評価用の熱伝導性シートの密度を、測定した。その結果を表2に示す。
2. 熱伝導率
(1)厚み方向の熱伝導率(TC1)
各実施例および各比較例において得られた熱伝導率評価用の熱伝導性シートを、1cm×1cmの正方形に切り出して切片を得、切片の表面(厚み方向一方面)全面にカーボンスプレー(カーボンのアルコール分散溶液)を塗布して乾燥し、かかる部分を受光部とし、裏面(厚み方向他方面)全面にカーボンスプレーを塗布して、これを検出部とした。
ρ : 熱伝導性シートの25℃における密度
Cp : 熱伝導性シートの比熱(実質的に0.9)
(2)面方向の熱伝導率(TC2)
各実施例および各比較例において得られた熱伝導率評価用の熱伝導性シートを、直径2.6cmの円形に切り出して、切片を得、表面の中央部にカーボンスプレーを円形状に塗布して乾燥し、かかる部分を受光部とし、裏面の中央部から径方向外側に間隔を隔てた周辺部に、カーボンスプレーをリング(円環)状に塗布して乾燥し、かかる部分を検出部とした。
ρ : 熱伝導性シートの25℃における密度
Cp : 熱伝導性シートの比熱(実質的に0.9)
3. 剥離接着力(90度ピール試験)
各実施例および各比較例において得られた剥離接着力評価用の熱伝導性シートを4×10cmの矩形状に切り出して、これを銅箔(10cm×10cm、厚み70μm、GTS−MP、古河電工(株)製)の粗面(表面粗さRz:12μm、JIS B0601−1994に準拠)に接触するように重ね合わせることにより、銅箔積層シートを作製した。
2 フィラー
2A 板状粒子
2B 非板状板状粒子
3 エポキシ樹脂
TD 厚み方向
PD 面方向
TC1 厚み方向TDの熱伝導率
TC2 面方向PDの熱伝導率
Claims (11)
- 銅箔に対する剥離接着力が、2N/10mm以上であり、
厚み方向の熱伝導率(TC1)が、4W/m・K以上であり、
前記厚み方向に対する直交方向の熱伝導率(TC2)が、20W/m・K以上であり、
前記厚み方向の熱伝導率(TC1)に対する前記直交方向の熱伝導率(TC2)の比(TC2/TC1)が、3以上である
ことを特徴とする、熱伝導性シート。 - 板状粒子および非板状粒子を含有するフィラーと、エポキシ樹脂とを含有し、
前記フィラーの含有割合が、40体積%以上であることを特徴とする、請求項1に記載の熱伝導性シート。 - 前記非板状粒子に対する前記板状粒子の含有割合が、体積基準で、4/3〜6/1であることを特徴とする、請求項2に記載の熱伝導性シート。
- 前記板状粒子のアスペクト比が、2以上10000以下であることを特徴とする、請求項2または3に記載の熱伝導性シート。
- 前記非板状粒子のアスペクト比が、1以上2未満であることを特徴とする、請求項2〜4のいずれか一項に記載の熱伝導性シート。
- 前記板状粒子が、窒化ホウ素からなることを特徴とする、請求項2〜5のいずれか一項に記載の熱伝導性シート。
- 前記非板状粒子が、金属酸化物、金属水酸化物および金属窒化物からなる群から選択される少なくとも1種の無機成分からなることを特徴とする、請求項2〜6いずれか一項に記載の熱伝導性シート。
- 前記非板状粒子が、酸化アルミニウム、水酸化アルミニウムおよび窒化アルミニウムからなる群から選択される少なくとも1種のアルミニウム化合物からなることを特徴とする、請求項2〜7のいずれか一項に記載の熱伝導性シート。
- 前記板状粒子の最大長さの平均値が、1〜100μmであることを特徴とする、請求項2〜8のいずれか一項に記載の熱伝導性シート。
- 前記非板状粒子の最大長さの平均値が、1〜100μmであることを特徴とする、請求項2〜9のいずれか一項に記載の熱伝導性シート。
- 板状粒子および非板状粒子を含有するフィラーと、エポキシ樹脂とを含有し、前記フィラーの含有割合が40体積%以上である樹脂組成物を準備する準備工程と、
前記樹脂組成物を熱プレスによりシート化するシート化工程と
を備えることを特徴とする、熱伝導性シートの製造方法。
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KR1020120100798A KR20130029019A (ko) | 2011-09-13 | 2012-09-12 | 열전도성 시트 및 그의 제조 방법 |
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US20130065987A1 (en) | 2013-03-14 |
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TW201311443A (zh) | 2013-03-16 |
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