JP6098289B2 - 熱伝導性シート - Google Patents
熱伝導性シート Download PDFInfo
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- JP6098289B2 JP6098289B2 JP2013068724A JP2013068724A JP6098289B2 JP 6098289 B2 JP6098289 B2 JP 6098289B2 JP 2013068724 A JP2013068724 A JP 2013068724A JP 2013068724 A JP2013068724 A JP 2013068724A JP 6098289 B2 JP6098289 B2 JP 6098289B2
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Description
粘着性熱伝導層が、アクリル系化合物を硬化させたアクリル系樹脂と熱伝導性フィラーを含有し、該アクリル系樹脂のガラス転移温度が−80〜15℃であり、粘着性熱伝導層のタック性が非粘着性樹脂層のタック性よりも高く、
非粘着性樹脂層はガラス転移温度が60〜110℃であり、
非粘着性樹脂層のタック性が、該非粘着性樹脂層にアルミニウム製円柱状プローブを、押しつけ速度30mm/min、引き剥がし速度120mm/min、荷重196g、押しつけ時間5.0秒、引っ張り距離5mm、プローブ加熱40℃、シートステージ加熱40℃の条件で押しつけて引き剥がすことにより測定されるプローブタックとして6〜30kN/m2である熱伝導性シートを提供する。
粘着性熱伝導層が、アクリル系化合物を硬化させたアクリル系樹脂と熱伝導性フィラーを含有し、該アクリル系樹脂のガラス転移温度が−80〜15℃であり、粘着性熱伝導層のタック性が非粘着性樹脂層のタック性よりも高く、
非粘着性樹脂層はガラス転移温度が60〜110℃であり、
非粘着性樹脂層と粘着性熱伝導層とのT型剥離強度が0.2N/cm以上である熱伝導性シートを提供する。
本発明の熱伝導性シートでは、粘着性熱伝導層と非粘着性樹脂層が積層している。
粘着性熱伝導層に平均粒径の異なる2種の熱伝導性フィラーを使用する場合、小径のフィラーと大径のフィラーの配合比は15:85〜90:10とすることが好ましい。
表1に示した樹脂及び硬化剤をトルエン:メチルエチルケトン=1:1の混合溶剤にて、固形分10質量%に調製し、バーコーターでPETフィルムに塗布し、90℃で5分間乾燥させて表1に示す塗布厚の非粘着性樹脂層を形成した。
各実施例及び比較例の熱伝導性シートについて、(a)非粘着性樹脂層のタック性、(b)熱伝導性シートの熱伝導率、(c)熱伝導性シートのリワーク性、(d)熱伝導性シートの非粘着性樹脂層と粘着性熱伝導層との層間剥離強度を次のように評価した。結果を表1に示す。
タック性試験機として、RHESCA社製タッキング試験機TAC−IIを使用し、非粘着性樹脂層に、直径10mmのアルミニウム製円柱状プローブを、押しつけ速度30mm/min、引き剥がし速度120mm/min、荷重196g、押しつけ時間5.0秒、引っ張り距離5mm、プローブ加熱40℃、シートステージ加熱40℃の条件で押しつけて引き剥がしたときプローブタックを測定した。なお、比較例4では、非粘着性樹脂層がないため、粘着性熱伝導層のタック性を測定した。
熱伝導シートの厚み方向の熱伝導率をASTM D−5470準拠の熱伝導率計(ソニー製)により測定した(ヒーター出力 8W、シート面圧 1kgf/cm2)
上下に平行に向かい合わせた銅のロッドの間に、熱伝導性シートを非粘着性樹脂層が下側になるように挟み、圧力1kgf/cm2で10分間放置し、その後にロッドを剥がした。このとき、熱伝導性シートの非粘着性樹脂層と銅板との間で剥離が生じている場合を○、それ以外を×と評価した。
引張試験機(RTG−1225、オリエンテック社)を用いて、図1に示すように、PETフィルム1が非粘着性樹脂層2に積層し、粘着性熱伝導層3にカバーフィルム4が積層したままの状態で、非粘着性樹脂層2と粘着性熱伝導層3との層間剥離強度をT型剥離試験により測定した。この場合、引張速度は500mm/min、サンプル幅は2cmとした。
2 非粘着性樹脂層
3 粘着性熱伝導層
4 カバーフィルム(PET)
Claims (4)
- 粘着性熱伝導層と非粘着性樹脂層とが積層している熱伝導性シートであって、
粘着性熱伝導層が、アクリル系化合物を硬化させたアクリル系樹脂と熱伝導性フィラーを含有し、該アクリル系樹脂のガラス転移温度が−80〜15℃であり、粘着性熱伝導層のタック性が非粘着性樹脂層のタック性よりも高く、
非粘着性樹脂層はガラス転移温度が60〜110℃であり、
非粘着性樹脂層のタック性が、該非粘着性樹脂層にアルミニウム製円柱状プローブを、押しつけ速度30mm/min、引き剥がし速度120mm/min、荷重196g、押しつけ時間5.0秒、引っ張り距離5mm、プローブ加熱40℃、シートステージ加熱40℃の条件で押しつけて引き剥がすことにより測定されるプローブタックとして6〜30kN/m2であり、
非粘着性樹脂層と粘着性熱伝導層とのT型剥離強度が0.2N/cm以上であり、
非粘着性樹脂層を形成する樹脂が、ポリビニルブチラール樹脂、ポリエステル樹脂及びウレタン樹脂から選ばれる熱伝導性シート。 - 熱伝導性シートの厚さ方向の熱伝導率が1.5W/m・K以上である請求項1記載の熱伝導性シート。
- 粘着性熱伝導層を形成するアクリル系化合物が、単官能(メタ)アクリレートモノマーである請求項1又は2記載の熱伝導性シート。
- 粘着性熱伝導層が、アクリル系化合物のモノマーユニット100質量部に対して、アジピン酸系、セバシン酸系、リン酸系、ヒマシ油系、オレイン酸系及びアクリル酸系から選ばれる1種以上の可塑剤20〜60質量部を含有する請求項1〜3のいずれかに記載の熱伝導性シート。
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