JP2002361772A - Heat conductive sheet - Google Patents

Heat conductive sheet

Info

Publication number
JP2002361772A
JP2002361772A JP2001168250A JP2001168250A JP2002361772A JP 2002361772 A JP2002361772 A JP 2002361772A JP 2001168250 A JP2001168250 A JP 2001168250A JP 2001168250 A JP2001168250 A JP 2001168250A JP 2002361772 A JP2002361772 A JP 2002361772A
Authority
JP
Japan
Prior art keywords
heat conductive
conductive sheet
sheet
nonwoven fabric
woven
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.)
Pending
Application number
JP2001168250A
Other languages
Japanese (ja)
Inventor
Motoyasu Nakanishi
幹育 中西
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzuki Sogyo Co Ltd
Original Assignee
Suzuki Sogyo Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Suzuki Sogyo Co Ltd filed Critical Suzuki Sogyo Co Ltd
Priority to JP2001168250A priority Critical patent/JP2002361772A/en
Publication of JP2002361772A publication Critical patent/JP2002361772A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001Technical content checked by a classifier
    • H01L2924/0002Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

PROBLEM TO BE SOLVED: To provide a heat conductive sheet which has excellent heat conductivity, flexibility and high reliability and in which a defect such as a craze or the like does not occur even by applying a large deformation such as folding or the like, and hence an accident such as a short circuit or the like can be more surely prevented, and to provide a heat conductive sheet which can be manufactured as a continuous sheet and which has a sufficient strength against a winding tension and excellent mass productivity. SOLUTION: The heat conductive sheet 1 comprises an insulating woven fabric or nonwoven fabric 4 laminated on at least one side surface of a sheet- like graphite 2 via an adhesive 3. Incidentally, a tensile strength of the woven fabric or the nonwoven fabric (according to a synthetic resin long stable fiber nonwoven fabric testing method of the Japan Chemical Fibres Association) is preferably 20 to 400 N/5 cm.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、熱伝導性シートに
関する。特に、各種の電気および電子機器の発熱性部品
から発生される熱を効率よく放熱するための放熱材とし
て好ましく用いられる熱伝導性シートに関する。
The present invention relates to a heat conductive sheet. In particular, the present invention relates to a heat conductive sheet preferably used as a heat radiating material for efficiently radiating heat generated from heat generating components of various electric and electronic devices.

【0002】[0002]

【従来の技術】各種の電気および電子機器においては、
発熱性部品から発生される熱を効率よく放熱すること
が、誤作動を防止したり、製品寿命を延ばしたりする上
で重要である。したがって、従来から発熱を伴う部品を
有する電気および電子機器においては、発生される熱を
放熱するための放熱材が用いられている。そして、この
ような放熱材の一つとして、黒鉛シートの少なくとも片
面に、シリコーンゴムを塗布した熱伝導性シートが特公
平3−51302号において開示されている。かかる熱
伝導性シートは、その形状からして取り扱いが容易であ
り、また少なくとも片面にシリコーンゴムを有してい
て、取り付け対象部との密着性も良く、電気および電子
機器の放熱材として便利なものとされている。しかしな
がら、かかる熱伝導性シートは、取り付け対象部に沿っ
て熱伝導性シートを変形させるときに、シリコーンゴム
層が部分的に薄くなったり、ひび割れを生じる場合があ
った。そのため、ひび割れ等を生じた部分でショートを
起こす可能性があり、使用時における信頼性の点で問題
があった。この問題は、近年の電子機器の小型化に伴
い、熱伝導性シートをより小さな空間に組み込むことが
要求される中で重要になりつつある。また、ショート等
の事故を防ぐためにシリコーンゴム層を厚くすると、熱
伝導シート全体の可撓性(曲げやすさ)が低下し、かつ
放熱性も低下するという問題があった。さらに、上記熱
伝導性シートを製造する場合、連続シートとして製造し
ようとすると、黒鉛シートがちぎれる恐れがあるため十
分な巻取りテンションを掛け難く、量産性にも課題を残
していた。
2. Description of the Related Art In various electric and electronic devices,
It is important to efficiently dissipate the heat generated from the heat-producing components in order to prevent malfunctions and extend the life of the product. Therefore, a heat radiating material for radiating generated heat has been used in electric and electronic devices having components that generate heat. As one of such heat dissipating materials, a heat conductive sheet in which a silicone rubber is applied to at least one surface of a graphite sheet is disclosed in Japanese Patent Publication No. 3-51302. Such a heat conductive sheet is easy to handle due to its shape, has silicone rubber on at least one side, has good adhesion to a mounting target portion, and is convenient as a heat radiating material for electric and electronic devices. It is assumed. However, in such a heat conductive sheet, when the heat conductive sheet is deformed along the attachment target portion, the silicone rubber layer may be partially thinned or cracked. For this reason, there is a possibility that a short circuit may occur in a portion where a crack or the like has occurred, and there has been a problem in reliability during use. This problem has become more important in recent years as electronic devices have been downsized, and it has been required to incorporate a heat conductive sheet into a smaller space. Further, when the thickness of the silicone rubber layer is increased in order to prevent an accident such as a short circuit, there is a problem that flexibility (easiness of bending) of the entire heat conductive sheet is reduced and heat radiation is also reduced. Furthermore, in the case of manufacturing the above-mentioned heat conductive sheet, if it is attempted to manufacture a continuous sheet, there is a risk that the graphite sheet may be torn, so that it is difficult to apply sufficient winding tension, and there remains a problem in mass productivity.

【0003】[0003]

【発明が解決しようとする課題】そこで本発明は、上記
従来の状況に鑑み、優れた熱伝導性、可撓性を有し、か
つ折り曲げるなどの大きな変形を加えても、ひび割れ等
の欠陥を生ずることなく、そのためショート等の事故を
より確実に防止することができて信頼性の高い、新規な
熱伝導性シートを提供することを目的とする。さらに、
巻取りテンションに対して十分な強度を有するため、連
続シートとして製造できて量産性に優れる、新規な熱伝
導性シートを提供することを目的とする。
SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, the present invention has excellent thermal conductivity and flexibility, and is free from defects such as cracks even when subjected to large deformation such as bending. It is an object of the present invention to provide a highly reliable and novel heat conductive sheet which can prevent an accident such as a short circuit more reliably without occurrence. further,
An object of the present invention is to provide a novel heat conductive sheet which has sufficient strength against a winding tension, can be manufactured as a continuous sheet, and is excellent in mass productivity.

【0004】[0004]

【課題を解決するための手段】上記課題を解決するた
め、本発明の熱伝導性シートは、請求項1として、シー
ト状黒鉛の少なくとも片面に、接着剤を介して絶縁性の
織布又は不織布を積層させたことを特徴とする。
According to a first aspect of the present invention, there is provided a thermally conductive sheet according to the present invention, wherein at least one surface of a sheet of graphite is insulated from an insulating woven or nonwoven fabric via an adhesive. Are laminated.

【0005】上記構成によれば、絶縁性の織布又は不織
布とシート状黒鉛とが一体化される。そして、熱伝導性
シート全体を例えば折り畳んだりしても、その大きな変
形に対して熱伝導性シートが柔軟に追従し、シート状黒
鉛、あるいは織布又は不織布に欠陥を生じない。また、
織布又は不織布は薄く形成されるため、シート状黒鉛本
来の熱伝導性が最大限に生かされ、全体として高い熱伝
導性が発揮される。さらに、熱伝導性シートと、それを
取り付ける電子機器等とが、織布又は不織布の厚さの分
だけ確実に離間するため、ショート等の事故が防止され
る。
[0005] According to the above configuration, the insulating woven or nonwoven fabric and the sheet graphite are integrated. Then, even if the entire heat conductive sheet is folded, for example, the heat conductive sheet flexibly follows the large deformation, and no defect occurs in the sheet graphite or the woven or nonwoven fabric. Also,
Since the woven or nonwoven fabric is formed to be thin, the thermal conductivity inherent in the sheet graphite is maximized, and high thermal conductivity is exhibited as a whole. Further, since the heat conductive sheet is securely separated from the electronic device to which the heat conductive sheet is attached by the thickness of the woven or non-woven fabric, an accident such as a short circuit is prevented.

【0006】また、請求項2は、請求項1記載の熱伝導
性シートにおいて、織布又は不織布の厚さが50〜20
0μmであることを特徴とする。
A second aspect of the present invention is the heat conductive sheet according to the first aspect, wherein the thickness of the woven or nonwoven fabric is 50 to 20.
0 μm.

【0007】上記構成によれば、熱伝導性シート全体の
高い熱伝導性を維持しつつ、強度を向上させる観点か
ら、織布又は不織布の厚さが最適化される。
[0007] According to the above configuration, the thickness of the woven or nonwoven fabric is optimized from the viewpoint of improving the strength while maintaining the high thermal conductivity of the entire thermally conductive sheet.

【0008】また、請求項3は、請求項1又は2記載の
熱伝導性シートにおいて、織布又は不織布の引張強度
(日本化学繊維協会の合繊長繊維不織布試験方法によ
る)が20〜400N/5cmであることを特徴とす
る。
A third aspect of the present invention is the heat conductive sheet according to the first or second aspect, wherein the woven or nonwoven fabric has a tensile strength of 20 to 400 N / 5 cm (according to the synthetic fiber nonwoven fabric test method of the Japan Chemical Fiber Association). It is characterized by being.

【0009】上記構成によれば、熱伝導性シートを、連
続シートとして量産的に製造する場合を考慮して、織布
又は不織布の引張強度が最適化される。
According to the above configuration, the tensile strength of the woven or non-woven fabric is optimized in consideration of mass production of the heat conductive sheet as a continuous sheet.

【0010】さらに、請求項4は、請求項1〜3のいず
れか記載の熱伝導性シートにおいて、シート状黒鉛の厚
さが100〜300μmであることを特徴とする。
A fourth aspect of the present invention is the heat conductive sheet according to any one of the first to third aspects, wherein the thickness of the sheet graphite is 100 to 300 μm.

【0011】上記構成によれば、熱伝導性シートの放熱
性、および可撓性のバランスを考慮して、シート状黒鉛
の厚さが最適化される。
According to the above configuration, the thickness of the sheet graphite is optimized in consideration of the balance between heat dissipation and flexibility of the heat conductive sheet.

【0012】[0012]

【発明の実施の形態】以下、本発明を詳細に説明する。
図1は、本発明の熱伝導性シートの実施の形態(1)に
おける断面を模式的に示したものである。図1の熱伝導
性シート1は、シート状黒鉛2の両面に、接着剤3を介
して絶縁性の織布又は不織布4が積層され概略構成され
ている。なお、図1では便宜的に、シート状黒鉛2の片
側において、織布又は不織布4が接着剤3に挟まれて3
層(シート状黒鉛2の両面では6層)構造であるように
描いているが、実際には、接着剤3は織布又は不織布4
に含浸した状態で硬化することが好ましく、その場合に
は、図1で示す3層は重なり合って1層となる。
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
FIG. 1 schematically shows a cross section of the heat conductive sheet according to the embodiment (1) of the present invention. The heat conductive sheet 1 of FIG. 1 has a schematic configuration in which an insulating woven or nonwoven fabric 4 is laminated on both sides of a sheet graphite 2 with an adhesive 3 interposed therebetween. In FIG. 1, for convenience, a woven or nonwoven fabric 4 is sandwiched between adhesives 3 on one side of the sheet graphite 2.
Although it is depicted as having a layer structure (six layers on both sides of the sheet graphite 2), the adhesive 3 is actually made of a woven or non-woven fabric 4.
It is preferable to cure in a state of being impregnated, and in that case, the three layers shown in FIG. 1 overlap to form one layer.

【0013】シート状黒鉛2としては、従来から知られ
た各種の黒鉛シートを適宜選択して用いることができ
る。例えば、天然黒鉛から誘導されたものや、高分子化
合物を黒鉛化して誘導されたもの等を挙げることがで
き、その製造由来は問わない。また、このシート状黒鉛
2は可撓性を有している。
As the sheet graphite 2, various types of graphite sheets known in the art can be appropriately selected and used. For example, those derived from natural graphite, those derived by graphitizing a polymer compound, and the like can be mentioned, and the origin of production is not limited. The sheet graphite 2 has flexibility.

【0014】シート状黒鉛2の厚さは、厚すぎると可撓
性が低下し、逆に薄すぎると織布又は不織布4の厚さの
影響が大きくなって放熱性が十分に得られないので、こ
れらのバランスを考慮して適宜設定される。具体的に
は、100〜300μm程度とすることが好ましいが、
これに限定されるものではない。
If the thickness of the sheet graphite 2 is too large, the flexibility is reduced, and if it is too thin, the influence of the thickness of the woven or non-woven fabric 4 becomes large, so that sufficient heat radiation cannot be obtained. Are appropriately set in consideration of these balances. Specifically, it is preferably about 100 to 300 μm,
It is not limited to this.

【0015】また、シート状黒鉛2の表面には、織布又
は不織布4との接着性を向上させるため、必要に応じ
て、予めプライマーを塗布しておくこともできる。この
プライマーの例として、プライマーC(商品名:信越シ
リコーン社製)、プライマーX(商品名:東レ・ダウコ
ーニング・シリコーン社製)、プライマーY(商品名:
東レ・ダウコーニング・シリコーン社製)、ME151
(商品名:東芝シリコーン社製)等を挙げることができ
る。
Further, a primer may be applied to the surface of the sheet graphite 2 in advance, if necessary, in order to improve the adhesion to the woven or nonwoven fabric 4. Examples of the primer include Primer C (trade name: manufactured by Shin-Etsu Silicone Co., Ltd.), Primer X (trade name: manufactured by Dow Corning Toray Silicone Co., Ltd.), and Primer Y (trade name:
Toray Dow Corning Silicone), ME151
(Trade name: manufactured by Toshiba Silicone Co., Ltd.) and the like.

【0016】次に、シート状黒鉛2に積層させる織布又
は不織布4としては、電気絶縁性を有することを条件と
して、種々の合成繊維、天然繊維、ガラス繊維等の織布
又は不織布の中から適宜選択し用いることができる。こ
のような織布又は不織布の好適な例として、メタ・アラ
ミドペーパー(商品名:デュポン帝人アドバンスドペー
パー社製)等のアラミド系繊維からなる不織布を挙げる
ことができる。織布又は不織布4を積層させることによ
り、熱伝導性シート1全体を撓ませたときの安全性が高
まり、大きな変形に対してひび割れ等の欠陥を生じるこ
とがなくなる。
Next, the woven or non-woven fabric 4 to be laminated on the sheet graphite 2 may be selected from various woven or non-woven fabrics such as synthetic fibers, natural fibers and glass fibers, provided that it has electrical insulation properties. It can be appropriately selected and used. A preferred example of such a woven or nonwoven fabric is a nonwoven fabric made of aramid fibers such as meta-aramid paper (trade name: manufactured by DuPont Teijin Advanced Paper Co., Ltd.). By laminating the woven or nonwoven fabric 4, the safety when the entire heat conductive sheet 1 is bent is enhanced, and a defect such as a crack is not caused by a large deformation.

【0017】織布又は不織布4の厚さは、厚すぎると熱
伝導性シート1全体の熱伝導率が低下するので好ましく
なく、逆に薄すぎるとシート状黒鉛2に対する補強効果
が十分に得られず、全体の柔軟さが損なわれるので、こ
れらのバランスを考慮して適宜設定される。具体的には
50〜200μm程度が適当であり、好ましくは50〜
100μmである。
If the thickness of the woven or nonwoven fabric 4 is too large, the thermal conductivity of the heat conductive sheet 1 as a whole is undesirably reduced. Conversely, if the thickness is too small, a sufficient reinforcing effect on the sheet graphite 2 can be obtained. However, since the overall flexibility is impaired, the setting is appropriately made in consideration of these balances. Specifically, about 50 to 200 μm is appropriate, and preferably 50 to 200 μm.
100 μm.

【0018】また、織布又は不織布4は、メッシュなど
の目の粗いものを用いることもできるが、目が粗すぎる
と、熱伝導性シート1を電子機器に取り付けたときに、
目の通孔の部分でショートする可能性があるので注意を
要する。具体的な目の粗さは、織布又は不織布4の厚さ
との関係もあり一概にはいえないが、少なくとも目付が
10g/m2以上であることが好ましい。
The woven or non-woven fabric 4 may be made of a coarse mesh such as a mesh. However, if the mesh is too coarse, when the heat conductive sheet 1 is attached to an electronic device,
Care must be taken because a short circuit may occur at the through-hole of the eye. Specific eye roughness, since it may also relationship between the thickness of the woven or nonwoven fabric 4 flatly, it is preferable that at least the basis weight is 10 g / m 2 or more.

【0019】また、本発明の熱伝導性シート1を、例え
ば巻取りテンション装置により連続シートとして製造す
るような場合を考慮し、本発明における織布又は不織布
4としては、外力に対して強靱なものを用いることが望
ましい。具体的には、織布又は不織布4の引張強度が2
0〜400N/5cm程度のものを用いることが好まし
い。なお、上記引張強度は、日本化学繊維協会の合繊長
繊維不織布試験方法によって得られる値である。
Considering the case where the heat conductive sheet 1 of the present invention is manufactured as a continuous sheet by, for example, a winding tension device, the woven or nonwoven fabric 4 of the present invention is tough against external force. It is desirable to use one. Specifically, the woven or nonwoven fabric 4 has a tensile strength of 2
It is preferable to use one having a size of about 0 to 400 N / 5 cm. In addition, the said tensile strength is a value obtained by the synthetic fiber long-fiber nonwoven fabric test method of the Japan Chemical Fiber Association.

【0020】さらに、接着剤3としては、電子機器等が
発熱するときの温度で溶融や劣化を起こさないことを条
件として、従来知られた各種の接着剤の中から適宜選択
して用いることができる。具体例としては、ゴム系、ア
クリル樹脂系、ポリアミド系、エポキシ系、エチレン−
酢酸ビニル共重合体、シリコーン樹脂系等の接着剤を挙
げることができる。
Further, the adhesive 3 may be appropriately selected from conventionally known various adhesives on condition that melting and deterioration do not occur at a temperature at which the electronic device generates heat. it can. Specific examples include rubber, acrylic resin, polyamide, epoxy, ethylene-
Adhesives such as a vinyl acetate copolymer and a silicone resin can be used.

【0021】次に、熱伝導性シート1の製造方法につい
て説明する。熱伝導性シート1は、シート状黒鉛2に対
し、接着剤3を介して織布又は不織布4を接着させるこ
とにより製造することができる。さらに具体的には、シ
ート状黒鉛2に接着剤3を塗布した後に、織布又は不織
布4を積層させ、接着剤3を硬化させる方法や、あるい
は予め織布又は不織布4に対し接着剤3を塗布もしくは
含浸させ、それとシート状黒鉛2とを積層させ、接着剤
3を硬化させる方法などを適宜採用することができる。
Next, a method of manufacturing the heat conductive sheet 1 will be described. The heat conductive sheet 1 can be manufactured by bonding a woven or nonwoven fabric 4 to the sheet graphite 2 via an adhesive 3. More specifically, after the adhesive 3 is applied to the sheet graphite 2, a woven or nonwoven fabric 4 is laminated and the adhesive 3 is cured, or the adhesive 3 is previously applied to the woven or nonwoven fabric 4. A method of applying or impregnating, laminating it with the sheet graphite 2 and curing the adhesive 3 can be appropriately adopted.

【0022】接着剤3を、シート状黒鉛2あるいは織布
又は不織布4に対して、塗布もしくは含浸させる方法と
しては、スプレー法、カレンダリング法、ワイヤーバー
コート法、ディッピング法等の公知の手段を適宜用いる
ことができる。
As a method of applying or impregnating the adhesive 3 to the sheet graphite 2 or the woven or non-woven fabric 4, a known method such as a spray method, a calendering method, a wire bar coating method, a dipping method and the like can be used. It can be used as appropriate.

【0023】シート状黒鉛2と織布又は不織布4とを積
層させ、硬化させるにあたっては、全体を加圧しつつ行
うことができる。加圧する方法としては、ロールや平板
プレス等の各種プレス機を用い、必要に応じて加熱しな
がら適宜行われる。加圧する際の圧力は、硬化温度や、
シート状黒鉛2の厚さ等によって適宜調整する。加圧す
ることにより、織布又は不織布4とシート状黒鉛2とが
強く密着したまま硬化が進むので、後に剥離や空隙を生
じる層間の欠陥が除かれ、高い熱伝導性が維持される。
When laminating the sheet-like graphite 2 and the woven or non-woven fabric 4 and curing them, the whole can be pressurized. As a method of applying pressure, various presses such as a roll and a flat plate press are used, and the pressure is appropriately increased while heating. The pressure at the time of pressing depends on the curing temperature,
It is appropriately adjusted depending on the thickness of the sheet graphite 2 and the like. By applying pressure, the curing proceeds while the woven or nonwoven fabric 4 and the sheet graphite 2 are in intimate contact with each other, so that defects between layers that cause peeling or voids later are removed, and high thermal conductivity is maintained.

【0024】次に、図2は、本発明の熱伝導性シートの
実施の形態(2)である。この実施の形態では、織布又
は不織布4が、シート状黒鉛2の片面のみに積層されて
いる。この場合、熱伝導性シート1を電子機器等に取り
付ける際には、絶縁性の織布又は不織布4の側が当然に
電子機器への取り付け面となる。また、この実施形態に
係る熱伝導性シート1は、片面にシート状黒鉛2が露出
しているため、より高い放熱性が得られる利点がある。
なお、織布又は不織布4を片面に積層させる以外の構成
は、上記実施の形態(1)に準ずる。
Next, FIG. 2 shows an embodiment (2) of the heat conductive sheet of the present invention. In this embodiment, a woven or nonwoven fabric 4 is laminated on only one surface of the sheet graphite 2. In this case, when attaching the heat conductive sheet 1 to an electronic device or the like, the side of the insulating woven or non-woven fabric 4 is naturally a surface to be attached to the electronic device. Further, the heat conductive sheet 1 according to this embodiment has an advantage that higher heat dissipation can be obtained because the sheet-like graphite 2 is exposed on one side.
The configuration other than the lamination of the woven or non-woven fabric 4 on one side conforms to the above-described embodiment (1).

【0025】[0025]

【実施例】以下、実施例を示して本発明をさらに具体的
に説明するが、これに限定されるものではない。 (実施例1)まず、厚さ160μmのポリエステル不織
布(ユニチカ社製;ラブシート(商品名))を、市販の
一般的なシリコーンワニス中に浸漬し、ポリエステル不
織布にシリコーンワニスを含浸させた。なお、含浸の割
合は、ポリエステル不織布に対し、シリコーンワニスが
固形分として120wt%となるように含浸させた。こ
れを、厚さ200μmのシート状黒鉛(日本カーボン社
製;ニカフィルムFL−401(商品名))の両面に積
層させ、平板プレス機を用いて加圧加熱して、接着剤で
あるシリコーンワニスが硬化したことを確認し、目的の
熱伝導性シートを得た。得られた熱伝導性シートは、全
体の厚さが300μmであった。
EXAMPLES Hereinafter, the present invention will be described more specifically with reference to Examples, but it should not be construed that the invention is limited thereto. Example 1 First, a 160 μm-thick polyester nonwoven fabric (manufactured by Unitika; Love Sheet (trade name)) was immersed in a commercially available general silicone varnish to impregnate the polyester nonwoven fabric with the silicone varnish. The impregnation ratio was such that the polyester nonwoven fabric was impregnated so that the silicone varnish had a solid content of 120 wt%. This was laminated on both sides of sheet graphite (manufactured by Nippon Carbon Co., Ltd .; Nikafilm FL-401 (trade name)) having a thickness of 200 μm, and was heated under pressure using a flat plate press to obtain silicone varnish as an adhesive Was confirmed, and the intended heat conductive sheet was obtained. The obtained heat conductive sheet had an overall thickness of 300 μm.

【0026】上記の熱伝導性シートについて、熱伝導率
計(京都電子工業社製;QTM500)を用いて熱伝導
率を測定した。その結果、熱伝導率は5W/mKであ
り、十分に高い数値を示した。また、指での折り曲げを
繰り返した場合、シート状黒鉛単体の場合にはすぐに生
じてしまうひび割れや劈開等が起こらず、破片の欠落も
なかった。そして、爪で完全に折れ筋が付くくらい折り
曲げることにより、初めてひび割れが観察されたが、そ
の場合でも破片の欠落はなく、厳しい条件での使用に十
分耐えるものであることが確認された。また、体積抵抗
率は6×1013Ω・cm、絶縁破壊強度は1.0kVで
あり、良好な結果であった。
The thermal conductivity of the above heat conductive sheet was measured using a thermal conductivity meter (manufactured by Kyoto Electronics Industry Co., Ltd .; QTM500). As a result, the thermal conductivity was 5 W / mK, which was a sufficiently high value. In addition, when bending with a finger was repeated, cracks, cleavage, etc., which would occur immediately in the case of the sheet-like graphite alone, did not occur, and there was no chipping. Then, cracking was observed for the first time by bending the nail so as to completely fold the nail, but even in this case, there was no chipping of the debris, and it was confirmed that the chip could sufficiently withstand use under severe conditions. The volume resistivity was 6 × 10 13 Ω · cm, and the dielectric breakdown strength was 1.0 kV, which was a good result.

【0027】[0027]

【発明の効果】以上、本発明の熱伝導性シートは、可撓
性に優れ、例えば折り曲げるなどの大きな変形を加えて
もその変形に対して柔軟に追従するため、ひび割れ等の
欠陥を生じず、ショート等の事故を確実に防止すること
ができる。また、積層させる織布又は不織布は一般的に
薄いため、シート状黒鉛本来の熱伝導性が生かされ、全
体として高い放熱性を発揮させることができる。さら
に、巻取りテンションに対して十分な強度を有するた
め、連続シートとして量産的に製造することが可能とな
る。
As described above, the heat conductive sheet of the present invention is excellent in flexibility and flexibly follows the deformation even when a large deformation such as bending is applied, so that defects such as cracks do not occur. And accidents such as short circuits can be reliably prevented. Further, since the woven or nonwoven fabric to be laminated is generally thin, the inherent thermal conductivity of the sheet graphite can be utilized, and high heat dissipation can be exhibited as a whole. Further, since the sheet has sufficient strength against the winding tension, it can be mass-produced as a continuous sheet.

【0028】本発明の熱伝導性シートは、発熱を伴う電
気および電子機器分野での放熱材として好ましく用いる
ことができ、特に、比較的狭い空間や多数の素子がこみ
入って取り付けられる空間などで、熱伝導性シートを大
きく変形させることが要求される場合などに適してい
る。
The heat conductive sheet of the present invention can be preferably used as a heat dissipating material in the field of electric and electronic devices which generate heat, particularly in a relatively narrow space or a space into which a large number of elements are embedded. It is suitable when the heat conductive sheet is required to be greatly deformed.

【図面の簡単な説明】[Brief description of the drawings]

【図1】 本発明の熱伝導性シートの実施の形態(1)
の断面を模式的に示す図である。
FIG. 1 is an embodiment (1) of a heat conductive sheet of the present invention.
It is a figure which shows the cross section of FIG.

【図2】 本発明の熱伝導性シートの実施の形態(2)
の断面を模式的に示す図である。
FIG. 2 is an embodiment (2) of the heat conductive sheet of the present invention.
It is a figure which shows the cross section of FIG.

【符号の説明】[Explanation of symbols]

1 熱伝導性シート 2 シート状黒鉛 3 接着剤 4 織布又は不織布 Reference Signs List 1 heat conductive sheet 2 sheet graphite 3 adhesive 4 woven or non-woven fabric

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 シート状黒鉛の少なくとも片面に、接着
剤を介して絶縁性の織布又は不織布が積層されてなる熱
伝導性シート。
1. A heat conductive sheet in which an insulating woven or nonwoven fabric is laminated on at least one surface of a sheet of graphite via an adhesive.
【請求項2】 請求項1記載の熱伝導性シートにおい
て、織布又は不織布の厚さが50〜200μmであるこ
とを特徴とする熱伝導性シート。
2. The heat conductive sheet according to claim 1, wherein the thickness of the woven or nonwoven fabric is 50 to 200 μm.
【請求項3】 請求項1又は2記載の熱伝導性シートに
おいて、織布又は不織布の引張強度(日本化学繊維協会
の合繊長繊維不織布試験方法による)が20〜400N
/5cmであることを特徴とする熱伝導性シート。
3. The heat conductive sheet according to claim 1, wherein the woven or nonwoven fabric has a tensile strength (according to the synthetic fiber nonwoven fabric test method of the Japan Chemical Fiber Association) of 20 to 400 N.
/ 5 cm.
【請求項4】 請求項1〜3のいずれか記載の熱伝導性
シートにおいて、シート状黒鉛の厚さが100〜300
μmであることを特徴とする熱伝導性シート。
4. The heat conductive sheet according to claim 1, wherein the thickness of the sheet graphite is 100 to 300.
μm.
JP2001168250A 2001-06-04 2001-06-04 Heat conductive sheet Pending JP2002361772A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001168250A JP2002361772A (en) 2001-06-04 2001-06-04 Heat conductive sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001168250A JP2002361772A (en) 2001-06-04 2001-06-04 Heat conductive sheet

Publications (1)

Publication Number Publication Date
JP2002361772A true JP2002361772A (en) 2002-12-18

Family

ID=19010505

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001168250A Pending JP2002361772A (en) 2001-06-04 2001-06-04 Heat conductive sheet

Country Status (1)

Country Link
JP (1) JP2002361772A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1739745A3 (en) * 2005-06-30 2008-06-18 Polymatech Co., Ltd. Heat-radiating sheet and heat-radiating structure
CN108701880A (en) * 2016-03-14 2018-10-23 松下知识产权经营株式会社 Composite sheet and the battery pack for using the composite sheet

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1739745A3 (en) * 2005-06-30 2008-06-18 Polymatech Co., Ltd. Heat-radiating sheet and heat-radiating structure
US7419722B2 (en) 2005-06-30 2008-09-02 Polymatech Co., Ltd. Heat-radiating sheet and heat-radiating structure
CN108701880A (en) * 2016-03-14 2018-10-23 松下知识产权经营株式会社 Composite sheet and the battery pack for using the composite sheet

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