JP2003048285A - Heat conducting sheet - Google Patents
Heat conducting sheetInfo
- Publication number
- JP2003048285A JP2003048285A JP2001237846A JP2001237846A JP2003048285A JP 2003048285 A JP2003048285 A JP 2003048285A JP 2001237846 A JP2001237846 A JP 2001237846A JP 2001237846 A JP2001237846 A JP 2001237846A JP 2003048285 A JP2003048285 A JP 2003048285A
- Authority
- JP
- Japan
- Prior art keywords
- heat conductive
- heat
- layer
- sheet
- heat conducting
- 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.)
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Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、プラズマディスプ
レイパネル（以下ＰＤＰという）の表示パネルと放熱板
を固定すると共に、表示パネルに発生した熱を放熱板へ
伝導するための熱伝導シートに係り、特に、大型のＰＤ
Ｐであっても、表示パネルと放熱板を安定的に固定でき
る熱伝導シートに関する。
【０００２】
【従来の技術】ＰＤＰにあっては、画像を表示する際に
表示パネルが発熱する。この熱によって、表示する画像
に色斑が発生したり、ＰＤＰ自体に破損が発生してしま
うため、表示パネルの背面へ、熱伝導シートを介して放
熱板が固定されている。
【０００３】この熱伝導シートとは、シート状の熱伝導
層と、熱伝導層の両面に積層された粘着剤層を有するも
のであり、例えば、特開２０００−２８１９８２号の手
段が知られている。
【０００４】
【発明が解決しようとする課題】表示パネルと放熱板で
は、材質の違いにより熱伸縮率に差があり、熱伝導シー
トで両者を固定すると伸縮歪みが発生する。このため、
従来の熱伝導シートを、熱伸縮量が大きい大型のＰＤＰ
に採用すると、伸縮歪みを吸収しきれず、熱伝導シート
から表示パネルや放熱板が剥離してしまうという課題が
あった。
【０００５】ここで、熱伝導シートに、伸縮歪みを吸収
させる伸縮緩和層を設けて、伸縮歪みによる剥離を防止
する手段が考えられるが、単に伸縮緩和層を設けただけ
では、伸縮緩和層自体が断熱材となり、表示パネルで発
生した熱が放熱板へ伝わらなくなるという新たな課題が
発生した。
【０００６】したがって本発明の目的は、熱伸縮量が大
きい大型のＰＤＰであっても、熱伝導性を維持しつつ、
伸縮歪みを吸収して、表示パネルと放熱板を安定的に固
定できる熱伝導シートを提供することにある。
【０００７】
【課題を解決するための手段】本発明者らは、上記に鑑
み鋭意検討を行った結果、アクリル系共重合体に熱伝導
フィラーを配合した熱伝導性組成物をシート状に成形し
て得られた熱伝導層と、アクリル系共重合体を熱伝導層
の両面へ積層して得られた粘着剤層を有する熱伝導シー
トにおいて、熱伝導層が、総厚６００〜２０００μｍの
複数層からなり、熱伝導層の層間へ、デュロメータ硬さ
４〜１２且つ厚さ２０〜１２０μｍの伸縮緩和層を有す
ることにより、上記課題を解決できることを見出だし本
発明を完成した。
【０００８】
【発明の実施の形態】本発明における熱伝導層は、表示
パネルで発生した熱を粘着剤層を介して放熱板へ伝導さ
せるものであり、アクリル系共重合体に熱伝導フィラー
を配合させた熱伝導性組成物をシート状に成形し、複数
積層させて総厚６００〜２０００μｍにしたものであ
る。
【０００９】熱伝導層の厚さは、あまりに厚いと熱伝導
層自体が断熱材となってしまい、表示パネルで発生した
熱を放熱板へ伝導できなくなってしまう。また、厚さが
あまりに薄いと、表示パネルや放熱板の表面粗さを吸収
できず、それぞれの界面において貼り付かない部分が発
生して、これらの部材を安定的に固定できなくなってし
まう。このため、熱伝導層の厚さにあっては、総厚６０
０〜２０００μｍがよい。
【００１０】熱伝導層のベースポリマとしてのアクリル
系共重合体は、一般的なものを適宜選択して採用でき、
具体的には、メチル基、エチル基、プロピル基、イソオ
クチル基、イソノニル基、イソデシル基、ドデシル基、
ラウリル基、トリデシル基、ペンタデシル基、ヘキサデ
シル基、ヘプタデシル基、オクタデシル基、ノナデシル
基、エイコキシル基などの、炭素数が２０以下のアルキ
ル基を有するアクリル酸又はメタクリル酸、イタコン
酸、アクリル酸ヒドロキエチル基、メタクリル酸ヒドロ
キシエチル、アクリル酸ヒドリキシプロピル、メタクリ
ル酸ヒドロキシプロピル、Ｎ―メチロールアクリルアミ
ド、アクリロニトリル、メタクリロニトリル、アクリル
酸グリシジル、酢酸ビニル、スチレン、イソプレン、ブ
タジエン、イソブチレン、ビニルエーテルなどがある。
【００１１】また、熱伝導層に配合する熱伝導フィラー
としては、上記効果を有するものであれば適宜選択して
採用でき、具体的には、アルミナ、ボロンナイトライ
ド、酸化珪素、水酸化アルミニウムなどがある。
【００１２】本発明における伸縮緩和層は、デュロメー
タ硬さ（ＪＩＳ Ｋ ６２５３）が４〜１２且つ厚さが
２０〜１２０μｍであり、熱伝導層の層間に配置され
て、表示パネルと放熱板の熱伸縮率の違いにより発生す
る伸縮歪みを吸収させるためのものである。
【００１３】伸縮緩和層の硬さは、一般的な弾性ゴムシ
ートの測定方法であるデュロメータ硬さにて評価した。
デュロメータ硬さは、あまりに高いと、伸縮歪みを吸収
しきれなくなり熱伝導シートから表示パネルや放熱板が
剥離してしまう。また、デュロメータ硬さがあまりに低
いと、ＰＤＰの表示パネルと放熱板を安定的に固定でき
なくなってしまう。このため、伸縮緩和層のデュロメー
タ硬さにあっては、４〜１２が良い。なお、デュロメー
タ硬さは、伸縮緩和層のベースポリマに、アルミナ、ボ
ロンナイトライド、酸化珪素、水酸化アルミニウムなど
のフィラーを配合して調整すればよい。
【００１４】さらに、伸縮緩和層の厚さがあまりに厚い
と、伸縮緩和層自体が断熱層になり表示パネルで発生し
た熱を放熱板へ伝導できなくなってしまう。また、厚さ
があまりに薄いと、伸縮歪みを吸収できずに熱伝導シー
トから表示パネルや放熱板が剥離してしまう。このた
め、伸縮緩和層の厚みにあっては、２０〜１２０μｍが
良い。
【００１５】伸縮緩和層のベースポリマとしては、上記
効果を有するアクリル系共重合体であれば適宜選択して
採用でき、具体的には、メチル基、エチル基、プロピル
基、イソオクチル基、イソノニル基、イソデシル基、ド
デシル基、ラウリル基、トリデシル基、ペンタデシル
基、ヘキサデシル基、ヘプタデシル基、オクタデシル
基、ノナデシル基、エイコキシル基などの、炭素数が２
０以下のアルキル基を有するアクリル酸又はメタクリル
酸、イタコン酸、アクリル酸ヒドロキエチル基、メタク
リル酸ヒドロキシエチル、アクリル酸ヒドリキシプロピ
ル、メタクリル酸ヒドロキシプロピル、Ｎ―メチロール
アクリルアミド、アクリロニトリル、メタクリロニトリ
ル、アクリル酸グリシジル、酢酸ビニル、スチレン、イ
ソプレン、ブタジエン、イソブチレン、ビニルエーテル
などがある。
【００１６】本発明における粘着剤層は、従来公知のも
のでよく、伸縮緩和層及び熱伝導層を介して表示パネル
と放熱板を安定的に固定するためのものである。なお、
粘着剤層の厚さは、一般的な１０〜６０μｍから選択し
て採用すれば良い。
【００１７】粘着剤層の材料としては、従来公知のアク
リル系共重合体を適宜選択して採用でき、具体的には、
メチル基、エチル基、プロピル基、イソオクチル基、イ
ソノニル基、イソデシル基、ドデシル基、ラウリル基、
トリデシル基、ペンタデシル基、ヘキサデシル基、ヘプ
タデシル基、オクタデシル基、ノナデシル基、エイコキ
シル基などの、炭素数が２０以下のアルキル基を有する
アクリル酸又はメタクリル酸、イタコン酸、アクリル酸
ヒドロキエチル基、メタクリル酸ヒドロキシエチル、ア
クリル酸ヒドリキシプロピル、メタクリル酸ヒドロキシ
プロピル、Ｎ―メチロールアクリルアミド、アクリロニ
トリル、メタクリロニトリル、アクリル酸グリシジル、
酢酸ビニル、スチレン、イソプレン、ブタジエン、イソ
ブチレン、ビニルエーテルなどがある。
【００１８】なお本発明伝導シートにおける粘着剤層、
熱伝導層及び伸縮緩和層にあっては、上記効果を阻害し
ない範囲で、改質剤、老化防止剤、熱安定剤、着色剤、
難燃剤などを添加しても良い。
【００１９】本発明の熱伝導シートは、以下の製法によ
って製造される。まず、剥離紙上に粘着剤層が積層さ
れ、粘着剤層上に熱伝導層が積層される。さらに、伸縮
緩和層、熱伝導層、粘着剤層が順に積層されて完成す
る。
【００２０】また、次の製法によって製造しても良い。
まず、剥離紙上に粘着剤層が積層され、粘着剤層上に熱
伝導層が積層される。さらに、熱伝導層上に伸縮緩和層
が積層された積層体を２つ準備し、伸縮緩和層同士を対
峙した状態で貼り合わされて完成する。
【００２１】なお、本発明の熱伝導シートを製造する際
に積層されるそれぞれの材料にあっては、カレンダーロ
ールによって調整したものだけでなく、材料を有機溶剤
や水に分散させたエマルジョンであっても良い。
【００２２】本発明にあっては、アクリル系共重合体に
熱伝導フィラーを配合した熱伝導性組成物をシート状に
成形して得られた熱伝導層と、アクリル系共重合体を熱
伝導層の両面へ積層して得られた粘着剤層を有する熱伝
導シートにおいて、熱伝導層が、総厚６００〜２０００
μｍの複数層からなり、熱伝導層の層間へ、デュロメー
タ硬さ４〜１２且つ厚さ２０〜１２０μｍの伸縮緩和層
を有することにより、熱伸縮量が大きい大型のＰＤＰで
あっても、伸縮歪みを吸収し、表示パネルと放熱板を安
定的に固定できる熱伝導シートが得られた。
【００２３】
【実施例】本発明における熱伝導シートの一実施例を、
図１及び表１を参照しつつ説明する。
【００２４】本実施例の熱伝導シートは、図１及び表1
に示したように、シート状に成形した厚さ９２０μｍの
熱伝導層１と、熱伝導層１の両面にそれぞれ積層された
厚さ厚さ４０μｍの粘着剤層２を有するものであり、熱
伝導層１の層間に、厚さ８０μｍの伸縮緩和層が設けら
れたものである。
【００２５】ここで、粘着剤層２は、アクリル系共重合
体を水に分散させたエマルジョン（一方社油脂工業株式
会社製 ＡＥ−１５０；樹脂成分５０％）を、乾燥させ
て得られたものである。また、熱伝導層１は、アクリル
系共重合体を水に分散させたエマルジョン（高圧ガス工
業株式会社製 ぺガール８５１；樹脂成分５５％）の樹
脂成分１００重量部に対して、熱伝導フィラーとしての
水酸化アルミニウム（昭和電工株式会社製 Ｈ−３２）
を１３５重量部配合した熱伝導性組成物を、乾燥させて
得られたものである。さらに、伸縮緩和層３は、アクリ
ル系共重合体を水に分散させたエマルジョン（高圧ガス
工業株式会社製 Ｈｐ−６２４５；樹脂製分６０％）の
樹脂成分１００重量部に対して、フィラーとしての水酸
化アルミニウム（昭和電工株式会社製 Ｈ−３２）を１
６重量部配合した組成物を、乾燥させて得られたもので
ある。なお、以下の比較例は、特に説明しない限り本実
施例と同様なものである。
【００２６】
【表１】
【００２７】表１中、伸縮歪み吸収性は、伸縮歪みによ
って熱伝導シートが剥離するか否かを特定する評価方法
として採用したものである。伸縮歪み吸収性は、縦４０
ｍｍ、横４０ｍｍ、厚さ１ｍｍに調整した熱伝導シート
の一方の面全体を覆うように、縦１００ｍｍ、横５０ｍ
ｍ、厚さ２ｍｍのアルミ板を貼り付け、さらに、熱伝導
シートの他方の面全体を覆うように、縦５０ｍｍ、横５
０ｍｍ、厚さ５ｍｍのフローガラス板を貼り付け、７２
時間養生して測定サンプルを得た。次に、得られたサン
プルを、下限温度−２０℃、上限温度１００℃、昇温２
０℃／分、降温２０℃／分に設定したヒートサイクル試
験機にて、上限及び下限温度で各６時間保持するサイク
ル試験を行ない、熱伝導シートからアルミ板やフローガ
ラスが剥離するまでの時間を測定した。伸縮歪み吸収性
にあっては、２０００時間を超えても剥離しなかったも
のを合格、２０００時間以内に剥離したものを不合格と
した。
【００２８】また表１中、熱伝導性は、縦３０ｍｍ、横
２０ｍｍ、厚さ１ｍｍに調整した熱伝導シートを、ヒー
ターブロックと放熱ブロックとの間に挟み、厚さが元の
熱伝導シートの９０％になるように圧縮して固定する。
次に、ヒーターブロックに５Ｗ、４分間の電力を印加
後、ヒーターブロックと放熱ブロックとの温度差を測定
し、次式より熱伝導度を算出した。熱伝導性にあって
は、熱伝導シートに求められる０．５Ｗ／ｍＫを超えた
ものを合格、０．５Ｗ／ｍＫ以下の値を示したものを不
合格とした。
熱伝導度（Ｗ／ｍＫ）＝Ｗ×ｔ／（Ｓ×（Ｔ１−Ｔ
２））
ここで、Ｗ（Ｗ）：印加電力（５Ｗ）
ｔ（ｍｍ）：試料厚さ（圧縮時）
Ｓ（ｍ2）：試料面積
Ｔ１（Ｋ）：ヒーターブロック温度
Ｔ２（Ｋ）：放熱ブロック温度
【００２９】本実施例にあっては、伸縮歪み吸収性、熱
伝導性とも合格となり、目標とする熱伝導シートが得ら
れた。
【００３０】実施例の熱伝導層１を、総厚２３００μｍ
に変更した比較例１では、熱伝導性が悪くなった。ま
た、総厚４００に変更した比較例２では、伸縮歪み吸収
性が悪くなった。
【００３１】実施例の伸縮緩和層３を、厚さ１５０μｍ
に変更した比較例３では、熱伝導性が悪くなった。ま
た、厚さ１０μｍに変更した比較例４では、伸縮歪み吸
収性が悪くなった。
【００３２】実施例の伸縮緩和層３に配合するフィラー
の配合量を、８０重量部に変更してデュロメータ硬さを
１５に調整した比較例５では、伸縮歪み吸収性が悪くな
った。また、フィラーの配合量を５重量部に変更してデ
ュロメータ硬さを２に調整した比較例６では、伸縮緩和
層３自体が破損して剥離してしまった。
【００３３】なお、表１中には記載しなかったが、伸縮
緩和層３を設けないものは伸縮歪み吸収性が悪く、０．
１時間以内にサンプルの剥離が確認された。
【００３４】
【発明の効果】本発明にあっては、アクリル系共重合体
に熱伝導フィラーを配合した熱伝導性組成物をシート状
に成形して得られた熱伝導層と、アクリル系共重合体を
熱伝導層の両面へ積層して得られた粘着剤層を有する熱
伝導シートにおいて、熱伝導層が、総厚６００〜２００
０μｍの複数層からなり、熱伝導層の層間へ、デュロメ
ータ硬さ４〜１２且つ厚さ２０〜１２０μｍの伸縮緩和
層を有することにより、熱伸縮量が大きい大型のＰＤＰ
であっても、伸縮歪みを吸収し、表示パネルと放熱板を
安定的に固定できる熱伝導シートが得られた。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display panel of a plasma display panel (hereinafter, referred to as a PDP) and a radiator plate, and heat generated in the display panel is transferred to the radiator plate. The present invention relates to a heat conductive sheet for conducting, especially, a large PD
The present invention relates to a heat conductive sheet that can stably fix a display panel and a heat radiating plate even if it is P. 2. Description of the Related Art In a PDP, a display panel generates heat when displaying an image. Since the heat causes color unevenness in an image to be displayed or damage to the PDP itself, a heat radiating plate is fixed to the rear surface of the display panel via a heat conductive sheet. The heat conductive sheet has a sheet-shaped heat conductive layer and an adhesive layer laminated on both sides of the heat conductive layer. For example, a means disclosed in Japanese Patent Application Laid-Open No. 2000-281982 is known. I have. [0004] There is a difference in thermal expansion and contraction ratio between the display panel and the heat radiating plate due to a difference in material, and expansion and contraction occurs when both are fixed with a heat conductive sheet. For this reason,
A large PDP with a large amount of thermal expansion and contraction
In this case, there is a problem that the display panel and the heat radiating plate are peeled off from the heat conductive sheet because the expansion distortion cannot be completely absorbed. Here, a means for preventing the peeling due to the stretching strain by providing a stretching layer for absorbing the stretching strain on the heat conductive sheet can be considered. Has become a heat insulating material, and a new problem has occurred in that heat generated in the display panel is not transmitted to the heat sink. Accordingly, an object of the present invention is to provide a large-sized PDP having a large thermal expansion and contraction while maintaining thermal conductivity.
An object of the present invention is to provide a heat conductive sheet that can stably fix a display panel and a heat sink by absorbing expansion and contraction distortion. Means for Solving the Problems The inventors of the present invention have conducted intensive studies in view of the above, and as a result, formed a heat conductive composition obtained by blending a heat conductive filler with an acrylic copolymer into a sheet. In a heat conductive sheet having an adhesive layer obtained by laminating a heat conductive layer and an acrylic copolymer on both sides of the heat conductive layer, the heat conductive layer has a total thickness of 600 to 2000 μm. It has been found that the above problem can be solved by having a stretch relaxation layer having a durometer hardness of 4 to 12 and a thickness of 20 to 120 μm between the heat conductive layers. [0008] The heat conductive layer in the present invention conducts the heat generated in the display panel to the heat radiating plate through the adhesive layer, and a heat conductive filler is added to the acrylic copolymer. The compounded heat conductive composition is formed into a sheet shape, and a plurality of layers are laminated to have a total thickness of 600 to 2000 μm. If the thickness of the heat conducting layer is too large, the heat conducting layer itself becomes a heat insulating material, and the heat generated in the display panel cannot be conducted to the heat radiating plate. On the other hand, if the thickness is too small, the surface roughness of the display panel or the heat radiating plate cannot be absorbed, and a portion that does not adhere to each interface will be generated, making it impossible to stably fix these members. Therefore, the total thickness of the heat conductive layer is 60
It is preferably from 0 to 2000 μm. As the acrylic copolymer as a base polymer of the heat conductive layer, a general one can be appropriately selected and employed.
Specifically, methyl, ethyl, propyl, isooctyl, isononyl, isodecyl, dodecyl,
Acrylic or methacrylic acid, itaconic acid, hydroxyethyl acrylate group having an alkyl group having 20 or less carbon atoms such as a lauryl group, a tridecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, an octadecyl group, a nonadecyl group, and an eicoxyl group. , Hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, N-methylolacrylamide, acrylonitrile, methacrylonitrile, glycidyl acrylate, vinyl acetate, styrene, isoprene, butadiene, isobutylene, vinyl ether and the like. As the heat conductive filler to be incorporated in the heat conductive layer, any material having the above-mentioned effects can be appropriately selected and employed, and specific examples thereof include alumina, boron nitride, silicon oxide, and aluminum hydroxide. There is. The expansion / contraction layer of the present invention has a durometer hardness (JIS K 6253) of 4 to 12 and a thickness of 20 to 120 μm, and is disposed between layers of the heat conductive layer, so that the heat of the display panel and the heat radiating plate can be reduced. This is for absorbing the stretching strain generated due to the difference in the stretching ratio. The hardness of the elastic layer was evaluated by durometer hardness, which is a general method for measuring an elastic rubber sheet.
If the durometer hardness is too high, the display panel and the heat radiating plate will not be able to absorb the expansion and contraction strain, and the display panel and the heat radiating plate will peel off. If the durometer hardness is too low, the PDP display panel and the heat sink cannot be stably fixed. Therefore, the durometer hardness of the expansion / contraction layer is preferably 4 to 12. The durometer hardness may be adjusted by adding a filler such as alumina, boron nitride, silicon oxide, or aluminum hydroxide to the base polymer of the expansion / contraction layer. Further, if the thickness of the expansion / contraction layer is too large, the expansion / contraction layer itself becomes a heat insulating layer, and the heat generated in the display panel cannot be conducted to the heat sink. On the other hand, if the thickness is too small, the display panel and the heat radiating plate are separated from the heat conductive sheet without being able to absorb the expansion and contraction distortion. For this reason, the thickness of the stretch relaxation layer is preferably 20 to 120 μm. As the base polymer of the expansion / contraction layer, any acrylic copolymer having the above-mentioned effects can be appropriately selected and employed. Specifically, a methyl group, an ethyl group, a propyl group, an isooctyl group, an isononyl group , Isodecyl, dodecyl, lauryl, tridecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicoxyl, etc.
Acrylic or methacrylic acid having an alkyl group of 0 or less, itaconic acid, hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, N-methylolacrylamide, acrylonitrile, methacrylonitrile, acrylic Examples include glycidyl acid, vinyl acetate, styrene, isoprene, butadiene, isobutylene, and vinyl ether. The pressure-sensitive adhesive layer in the present invention may be a conventionally known pressure-sensitive adhesive layer, and is used for stably fixing the display panel and the heat radiating plate via the expansion / contraction layer and the heat conductive layer. In addition,
The thickness of the pressure-sensitive adhesive layer may be selected and adopted from general 10 to 60 μm. As a material for the pressure-sensitive adhesive layer, a conventionally known acrylic copolymer can be appropriately selected and employed.
Methyl group, ethyl group, propyl group, isooctyl group, isononyl group, isodecyl group, dodecyl group, lauryl group,
Acrylic or methacrylic acid, itaconic acid, hydroxyethyl acrylate, methacrylic acid having an alkyl group having 20 or less carbon atoms, such as a tridecyl group, a pentadecyl group, a hexadecyl group, a heptadecyl group, an octadecyl group, a nonadecyl group, an eicoxyl group, etc. Hydroxyethyl, hydroxypropyl acrylate, hydroxypropyl methacrylate, N-methylolacrylamide, acrylonitrile, methacrylonitrile, glycidyl acrylate,
Examples include vinyl acetate, styrene, isoprene, butadiene, isobutylene, and vinyl ether. The pressure-sensitive adhesive layer in the conductive sheet of the present invention,
In the heat conductive layer and the stretch relaxation layer, as long as the above effects are not impaired, a modifier, an antioxidant, a heat stabilizer, a coloring agent,
A flame retardant may be added. The heat conductive sheet of the present invention is manufactured by the following method. First, an adhesive layer is laminated on release paper, and a heat conductive layer is laminated on the adhesive layer. Further, the expansion / contraction layer, the heat conductive layer, and the pressure-sensitive adhesive layer are sequentially laminated to complete the process. Further, it may be manufactured by the following manufacturing method.
First, an adhesive layer is laminated on release paper, and a heat conductive layer is laminated on the adhesive layer. Furthermore, two laminates in which the expansion / contraction layer is laminated on the heat conductive layer are prepared, and the expansion / contraction layers are bonded to each other in a state where they face each other. The materials to be laminated when producing the heat conductive sheet of the present invention are not only those prepared by calender rolls but also emulsions in which the materials are dispersed in an organic solvent or water. May be. In the present invention, a heat conductive layer obtained by molding a heat conductive composition obtained by blending a heat conductive filler with an acrylic copolymer into a sheet is used. In a heat conductive sheet having an adhesive layer obtained by laminating on both sides of a layer, the heat conductive layer has a total thickness of 600 to 2000.
a large PDP having a durometer hardness of 4 to 12 and a thickness of 20 to 120 μm between layers of the heat conductive layer, so that even a large PDP having a large thermal expansion and contraction And a heat conductive sheet capable of stably fixing the display panel and the heat radiating plate was obtained. An embodiment of the heat conductive sheet of the present invention will be described below.
This will be described with reference to FIG. 1 and Table 1. The heat conductive sheet of this embodiment is shown in FIG.
As shown in FIG. 1, the heat conductive layer 1 has a thickness of 920 μm and is formed into a sheet shape, and the pressure-sensitive adhesive layer 2 has a thickness of 40 μm laminated on both sides of the heat conductive layer 1. An 80 μm-thick stretch relaxation layer is provided between the layers 1. Here, the pressure-sensitive adhesive layer 2 is obtained by drying an emulsion obtained by dispersing an acrylic copolymer in water (AE-150 manufactured by YAS Co., Ltd .; resin component 50%). It is. In addition, the heat conductive layer 1 is used as a heat conductive filler with respect to 100 parts by weight of a resin component of an emulsion in which an acrylic copolymer is dispersed in water (ぺ Gall 851, manufactured by Koatsu Gas Co., Ltd .; resin component 55%). Aluminum hydroxide (H-32 manufactured by Showa Denko KK)
Was obtained by drying a heat conductive composition containing 135 parts by weight of Furthermore, the expansion / contraction relaxation layer 3 is used as a filler as a filler with respect to 100 parts by weight of a resin component of an emulsion (Hp-6245, manufactured by Kogaku Gas Kogyo Co., Ltd .; resin content 60%) in which an acrylic copolymer is dispersed in water. 1 piece of aluminum hydroxide (H-32 manufactured by Showa Denko KK)
The composition obtained by drying 6 parts by weight of the composition. The following comparative examples are the same as the present embodiment unless otherwise specified. [Table 1] In Table 1, the stretch strain absorption is employed as an evaluation method for specifying whether or not the heat conductive sheet is peeled off due to the stretch strain. The stretch strain absorption is 40
mm, width 40 mm, thickness 1 mm, 100 mm length, 50 m width so as to cover one entire surface of the heat conductive sheet.
m, an aluminum plate having a thickness of 2 mm, and a 50 mm long, 5 mm wide so as to cover the entire other surface of the heat conductive sheet.
Attach a flow glass plate of 0 mm and thickness of 5 mm.
After curing for a time, a measurement sample was obtained. Next, the obtained sample was subjected to a lower limit temperature of −20 ° C., an upper limit temperature of 100 ° C., and a temperature rise of 2 ° C.
Using a heat cycle tester set at 0 ° C / min and a temperature drop of 20 ° C / min, a cycle test was performed in which the aluminum plate and flow glass were peeled off from the heat conductive sheet for 6 hours at each of the upper and lower temperatures. Was measured. Regarding the stretch strain absorption, those that did not peel even after more than 2000 hours were passed, and those that peeled within 2000 hours were rejected. In Table 1, the thermal conductivity was adjusted to 30 mm in length, 20 mm in width and 1 mm in thickness by sandwiching the heat conductive sheet between the heater block and the heat radiating block. Compress and fix to 90%.
Next, after applying 5 W of electric power for 4 minutes to the heater block, the temperature difference between the heater block and the heat dissipation block was measured, and the thermal conductivity was calculated from the following equation. Regarding the thermal conductivity, those exceeding 0.5 W / mK required for the heat conductive sheet were accepted, and those showing a value of 0.5 W / mK or less were rejected. Thermal conductivity (W / mK) = W × t / (S × (T1-T
2)) Here, W (W): applied power (5 W) t (mm): sample thickness (when compressed) S (m 2 ): sample area T1 (K): heater block temperature T2 (K): heat radiation Block Temperature In this example, both the stretch strain absorption and the thermal conductivity were acceptable, and the target thermal conductive sheet was obtained. The heat conductive layer 1 of the embodiment has a total thickness of 2300 μm.
In Comparative Example 1, the thermal conductivity was poor. Further, in Comparative Example 2 in which the total thickness was changed to 400, the stretching strain absorption was poor. The stretch relaxation layer 3 of the embodiment was formed to a thickness of 150 μm.
In Comparative Example 3 in which the heat conductivity was changed, the thermal conductivity was poor. Further, in Comparative Example 4 in which the thickness was changed to 10 μm, the stretching strain absorption was poor. In Comparative Example 5 in which the durometer hardness was adjusted to 15 by changing the blending amount of the filler to be blended into the stretching relaxation layer 3 to 80 parts by weight, the stretching strain absorption was poor. In Comparative Example 6, in which the durometer hardness was adjusted to 2 by changing the blending amount of the filler to 5 parts by weight, the stretch relaxation layer 3 itself was damaged and peeled off. Although not shown in Table 1, those without the stretch relaxation layer 3 had poor stretch strain absorption,
Peeling of the sample was confirmed within one hour. According to the present invention, a heat conductive layer obtained by molding a heat conductive composition obtained by blending a heat conductive filler with an acrylic copolymer into a sheet is provided with an acrylic copolymer. In a heat conductive sheet having an adhesive layer obtained by laminating a polymer on both sides of a heat conductive layer, the heat conductive layer has a total thickness of 600 to 200.
A large PDP having a plurality of layers of 0 μm and a stretch relaxation layer having a durometer hardness of 4 to 12 and a thickness of 20 to 120 μm between layers of the heat conductive layer, thereby providing a large amount of thermal expansion and contraction.
Even in this case, a heat conductive sheet capable of absorbing the stretching strain and stably fixing the display panel and the heat radiating plate was obtained.
【図面の簡単な説明】
【図１】実施例の熱伝導シートを模式的に示した端面図
である。
【符号の説明】
１ 熱伝導層
２ 粘着剤層
３ 伸縮緩和層BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an end view schematically showing a heat conductive sheet of an example. [Description of Signs] 1 Thermal conductive layer 2 Adhesive layer 3 Stretch relaxation layer
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 4F100 AA19H AA20H AK25 AK25A AK25C AK25D AR00B BA04 BA10C BA10D BA25A CA23A GB41 JJ01A JK08B JK12B JL13C JL13D YY00A YY00B 5C040 FA10 KA14 MA13 ────────────────────────────────────────────────── ─── Continuation of front page F term (reference) 4F100 AA19H AA20H AK25 AK25A AK25C AK25D AR00B BA04 BA10C BA10D BA25A CA23A GB41 JJ01A JK08B JK12B JL13C JL13D YY00A YY00B 5C040 FA10 KA14 MA13
Claims (1)
配合した熱伝導性組成物をシート状に成形して得られた
熱伝導層（１）と、アクリル系共重合体を該熱伝導層
（１）の両面へ積層して得られた粘着剤層（２）を有す
る熱伝導シートにおいて、上記熱伝導層（１）が、総厚
６００〜２０００μｍの複数層からなり、該熱伝導層
（１）の層間に、デュロメータ硬さ４〜１２且つ厚さ２
０〜１２０μｍの伸縮緩和層（３）を有することを特徴
とする熱伝導シート。Claims: 1. A heat conductive layer (1) obtained by molding a heat conductive composition obtained by blending a heat conductive filler into an acrylic copolymer into a sheet, and an acrylic copolymer. In the heat conductive sheet having the pressure-sensitive adhesive layer (2) obtained by laminating the coalesced on both surfaces of the heat conductive layer (1), the heat conductive layer (1) comprises a plurality of layers having a total thickness of 600 to 2000 µm. A durometer hardness of 4 to 12 and a thickness of 2 between the heat conductive layers (1).
A heat conductive sheet having a stretch relaxation layer (3) of 0 to 120 µm.
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| JP2001237846A JP4614593B2 (en) | 2001-08-06 | 2001-08-06 | Heat conduction sheet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001237846A JP4614593B2 (en) | 2001-08-06 | 2001-08-06 | Heat conduction sheet |
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| JP4614593B2 JP4614593B2 (en) | 2011-01-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7527753B2 (en) | 2003-04-16 | 2009-05-05 | 3M Innovative Properties Company | Acrylic-based thermally conductive composition and thermally conductive sheet |
| JP2009120841A (en) * | 2008-12-18 | 2009-06-04 | Three M Innovative Properties Co | Acrylic thermally conductive composition and article including the same |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5892734B2 (en) | 2011-05-02 | 2016-03-23 | スリーエム イノベイティブ プロパティズ カンパニー | Thermally conductive sheet |
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|---|---|---|---|---|
| JPH11157011A (en) * | 1997-09-24 | 1999-06-15 | Tokai Rubber Ind Ltd | Thermal conductive composite sheet, continuous manufacture thereof, and plasma display using it |
| JPH11292998A (en) * | 1998-04-03 | 1999-10-26 | Minnesota Mining & Mfg Co <3M> | Heat-conductive sheet |
| JP2000281982A (en) * | 1999-03-30 | 2000-10-10 | Tokai Rubber Ind Ltd | Heat-radiating pressure-sensitive adhesive sheet and preparation thereof |
| JP2001138918A (en) * | 1999-11-11 | 2001-05-22 | Yamato Industry Co Ltd | Carrying truck |
| JP2001168246A (en) * | 1999-11-30 | 2001-06-22 | Three M Innovative Properties Co | Heat conductive sheet and manufacturing method thereof |
-
2001
- 2001-08-06 JP JP2001237846A patent/JP4614593B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11157011A (en) * | 1997-09-24 | 1999-06-15 | Tokai Rubber Ind Ltd | Thermal conductive composite sheet, continuous manufacture thereof, and plasma display using it |
| JPH11292998A (en) * | 1998-04-03 | 1999-10-26 | Minnesota Mining & Mfg Co <3M> | Heat-conductive sheet |
| JP2000281982A (en) * | 1999-03-30 | 2000-10-10 | Tokai Rubber Ind Ltd | Heat-radiating pressure-sensitive adhesive sheet and preparation thereof |
| JP2001138918A (en) * | 1999-11-11 | 2001-05-22 | Yamato Industry Co Ltd | Carrying truck |
| JP2001168246A (en) * | 1999-11-30 | 2001-06-22 | Three M Innovative Properties Co | Heat conductive sheet and manufacturing method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7527753B2 (en) | 2003-04-16 | 2009-05-05 | 3M Innovative Properties Company | Acrylic-based thermally conductive composition and thermally conductive sheet |
| KR101099258B1 (en) * | 2003-04-16 | 2011-12-27 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | Acrylic-based thermally conductive composition and thermally conductive sheet |
| JP2009120841A (en) * | 2008-12-18 | 2009-06-04 | Three M Innovative Properties Co | Acrylic thermally conductive composition and article including the same |
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|---|---|
| JP4614593B2 (en) | 2011-01-19 |
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