WO2015147254A1 - 電子機器用熱伝導性積層体 - Google Patents
電子機器用熱伝導性積層体 Download PDFInfo
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- WO2015147254A1 WO2015147254A1 PCT/JP2015/059589 JP2015059589W WO2015147254A1 WO 2015147254 A1 WO2015147254 A1 WO 2015147254A1 JP 2015059589 W JP2015059589 W JP 2015059589W WO 2015147254 A1 WO2015147254 A1 WO 2015147254A1
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- foam sheet
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- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- C—CHEMISTRY; METALLURGY
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
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Definitions
- the present invention relates to a thermally conductive laminate for electronic equipment for efficiently dissipating heat inside the electronic equipment to the outside.
- thermoconductive foams containing thermal conductors have been proposed (for example, Patent Documents 1 and 2).
- the heat dissipating grease has good heat dissipating property, once the grease is applied, it is difficult to reapply it, and there is a problem that the yield of the product is lowered.
- the heat-dissipating gel is generally difficult to process into a sheet having a thickness of 1 mm or less, and there is a problem that the shape is deformed when compressed.
- a thin sheet has a problem that the compressive strength is high and the flexibility is low.
- Thermally conductive foams are thin and have good flexibility, so they are suitable for applications where heat inside thin electronic devices is dissipated to the outside, but they are not self-adhesive like silicone. It is necessary to give a layer.
- the foam is soft and thin, there is a drawback that once it is applied to the adherend surface, it is easily broken during rework.
- the present invention has been made in view of the above-described conventional problems, and has thinness, flexibility, and thermal conductivity that can be suitably used inside an electronic device, and is excellent in that it is not easily broken during rework. It is an object of the present invention to provide a thermally conductive laminate for electronic equipment having excellent workability.
- the present invention relates to a thermally conductive laminate for electronic equipment in which a double-sided adhesive tape is attached to at least one surface of a foam sheet having a 25% compressive strength of 200 kPa or less and a thickness of 0.05 to 1.0 mm.
- the base material of the double-sided pressure-sensitive adhesive tape is a heat conductive laminate for electronic equipment, wherein the base material is polyethylene terephthalate having a thickness of 2 to 100 ⁇ m.
- the heat conductive laminate for electronic equipment has excellent thinness, flexibility, and thermal conductivity that can be suitably used inside the electronic equipment, and also has excellent workability that is difficult to break during rework.
- the body can be provided.
- the heat conductive laminate for electronic equipment of the present invention has a 25% compressive strength of 200 kPa or less and a double-sided adhesive tape applied to at least one surface of a foam sheet having a thickness of 0.05 to 1.0 mm.
- the double-sided pressure-sensitive adhesive tape base material is polyethylene terephthalate having a thickness of 2 to 100 ⁇ m.
- the 25% compressive strength of the foam sheet used in the present invention is 200 kPa or less.
- the 25% compressive strength of the foam sheet is preferably 5 kPa or more, more preferably 10 kPa or more, further preferably 15 kPa or more, still more preferably 20 kPa or more, and preferably 190 kPa or less, 180 kPa or less is more preferable, 150 kPa or less is still more preferable, 100 kPa or less is still more preferable, 50 kPa or less is still more preferable, and 40 kPa or less is still more preferable.
- the 25% compressive strength of the foam sheet is preferably 5 to 190 kPa, more preferably 10 to 190 kPa, more preferably 15 to 150 kPa, and still more preferably 20 to 100 kPa, from the viewpoint of the flexibility of the foam sheet.
- the 50% compressive strength of the foam sheet used in the present invention is preferably 200 kPa or less. If the 50% compressive strength of the foam sheet is 200 kPa or less, it can be suitably used for thin electronic devices such as mobile terminals. From the viewpoint of improving flexibility, the 50% compressive strength of the foam sheet is more preferably 150 kPa or less, and even more preferably 100 kPa or less.
- the thickness of the foam sheet is 0.05 to 1 mm.
- the thickness of the foam sheet is preferably 0.05 to 0.8 mm, more preferably 0.05 to 0.7 mm, and still more preferably 0.05 to 0.5 mm.
- the thermal conductivity of the foam sheet is preferably 0.3 to 10 W / m ⁇ K, more preferably 0.4 to 2.0 W / m ⁇ K, still more preferably 0.45 to 2.0 W / m ⁇ K. .
- the thermal conductivity of the foam sheet is within the above range, it becomes possible to efficiently dissipate heat inside the electronic device to the outside.
- the foaming ratio of the foam sheet is preferably 1.5 to 6 times, more preferably 1.5 to 5 times, still more preferably 1.5 to 4 times, and even more preferably 1.5 to 3.5 times.
- the foaming ratio of the foam sheet is within the above range, both the thinness and flexibility of the sheet can be achieved.
- Apparent density of the foam sheet is preferably 0.3 ⁇ 1.5g / cm 3, more preferably 0.35 ⁇ 1.5g / cm 3, more preferably 0.4 ⁇ 1.5g / cm 3, 0 0.4 to 1.4 g / cm 3 is more preferable, 0.5 to 1.4 g / cm 3 is still more preferable, and 0.55 to 1.2 g / cm 3 is still more preferable. If the apparent density of the foam sheet is within the above range, a foam sheet having a desired thickness, flexibility, and thermal conductivity can be obtained.
- the foam sheet used in the present invention is obtained by foaming an elastomer resin.
- elastomer resins that can be used in the present invention include acrylonitrile butadiene rubber, liquid acrylonitrile butadiene rubber, ethylene-propylene-diene rubber, liquid ethylene-propylene-diene rubber, ethylene-propylene rubber, liquid ethylene-propylene rubber, natural rubber, and polybutadiene rubber.
- the liquid elastomer content in the elastomer resin is preferably 10% by mass or more, more preferably 20% by mass or more, and preferably 90% by mass or less, more preferably 80% by mass or less.
- the elastomer resin which comprises the said foam sheet contains a heat conductor from a viewpoint of improving heat conductivity.
- the thermal conductor that can be used in the present invention include oxides such as aluminum oxide and magnesium oxide, nitrides such as boron nitride and aluminum nitride, carbon compounds such as graphite and graphene, and talc. Among these, at least one selected from oxides, nitrides and talc is preferable, at least one selected from oxides is more preferable, at least one selected from aluminum oxide and magnesium oxide is still more preferable, and magnesium oxide Is even more preferable. These may be used alone or in combination of two or more.
- the thermal conductivity of the thermal conductor is preferably 5 W / m ⁇ K or more, and more preferably 20 W / m ⁇ K or more. When the thermal conductivity is within the above range, the thermal conductivity of the foam sheet is sufficiently high.
- the content of the heat conductor is preferably 100 to 500 parts by mass with respect to 100 parts by mass of the elastomer resin.
- the content of the heat conductor is 100 parts by mass or more, sufficient thermal conductivity can be imparted to the foam sheet, and when the content of the heat conductor is 500 parts by mass or less, It can prevent that a softness
- the content of the thermal conductor with respect to 100 parts by mass of the elastomer resin is preferably 120 to 480 parts by mass, and more preferably 150 to 450 parts by mass.
- the foam sheet in the present invention is preferably produced by mixing the elastomer resin and a foaming agent and chemically foaming them.
- a foaming agent in the case of chemical foaming, a thermally decomposable foaming agent that decomposes by heat to generate gas is preferable.
- the thermally decomposable foaming agent include azodicarbonamide, benzenesulfonylhydrazide, dinitrosopentamethylenetetramine, toluenesulfonylhydrazide, 4,4-oxybis (benzenesulfonylhydrazide), and the like. These may be used alone or in combination of two or more.
- the content of the foaming agent is preferably 1 to 30 parts by mass, more preferably 3 to 25 parts by mass, and still more preferably 5 to 20 parts by mass with respect to 100 parts by mass of the elastomer resin.
- the blending amount of the foaming agent is within the above range, a foam having excellent flexibility can be obtained.
- additive component can be contained as necessary within a range not impairing the object of the present invention.
- the kind of the additive component is not particularly limited, and various additives usually used for foam molding can be used.
- additives include lubricants, shrinkage inhibitors, cell nucleating agents, crystal nucleating agents, plasticizers, colorants (pigments, dyes, etc.), ultraviolet absorbers, antioxidants, anti-aging agents, and the above-described conductivity imparting.
- examples include fillers excluding materials, reinforcing agents, flame retardants, flame retardant aids, antistatic agents, surfactants, vulcanizing agents, and surface treatment agents.
- the addition amount of the additive can be appropriately selected within a range that does not impair the formation of bubbles and the like, and the addition amount used for normal resin foaming and molding can be adopted. These may be used alone or in combination of two or more.
- Lubricants improve the fluidity of the resin and suppress the thermal degradation of the resin.
- the lubricant used in the present invention is not particularly limited as long as it has an effect on improving the fluidity of the resin.
- hydrocarbon lubricants such as liquid paraffin, paraffin wax, microwax and polyethylene wax
- fatty acid lubricants such as stearic acid, behenic acid, 12-hydroxystearic acid
- ester lubricants such as hydrogenated castor oil and stearyl stearate.
- the addition amount of the lubricant is preferably about 0.01 to 5 parts by mass, more preferably 0.05 to 4 parts by mass, and further preferably 0.1 to 3 parts by mass with respect to 100 parts by mass of the elastomer resin. . If the amount added exceeds 10 parts by mass, the fluidity may become too high and the expansion ratio may decrease. If the amount added is less than 0.5 parts by mass, the fluidity cannot be improved, and the stretchability at the time of foaming is low. There is a risk that the expansion ratio will decrease.
- the flame retardant examples include bromine-based flame retardants such as decabromodiphenyl ether and phosphorus-based flame retardants such as ammonium polyphosphate in addition to metal hydroxides such as aluminum hydroxide and magnesium hydroxide.
- Antimony compounds such as antimony trioxide, antimony tetroxide, antimony pentoxide, sodium pyroantimonate, antimony trichloride, antimony trisulfide, antimony oxychloride, antimony perchloropentane dichloride, potassium antimonate, etc.
- boron compounds such as zinc metaborate, zinc tetraborate, zinc borate, basic zinc borate, zirconium oxide, tin oxide, molybdenum oxide, and the like.
- the foam sheet used in the present invention can be produced by a known chemical foaming method or physical foaming method, and the production method is not particularly limited.
- the foaming processing method can use a well-known method including the method described in the plastic foam handbook (Makihiro, Atsushi Kosaka edit Nikkan Kogyo Shimbun 1973).
- the heat conductive laminate for electronic equipment of the present invention is obtained by attaching a double-sided adhesive tape to at least one surface of the foam sheet, and the base material of the double-sided adhesive tape is polyethylene terephthalate having a thickness of 2 to 100 ⁇ m. Composed. If the thickness of the base material of the double-sided pressure-sensitive adhesive tape is less than 2 ⁇ m, the base material is easily broken and the workability of the laminate is deteriorated. From the viewpoint of workability of the laminate, the thickness of the base material of the double-sided pressure-sensitive adhesive tape is preferably 3 to 100 ⁇ m, more preferably 3 to 80 ⁇ m, and still more preferably 4 to 50 ⁇ m.
- the thickness of the substrate is 100 ⁇ m or less, the heat dissipation performance is improved, the total thickness is further reduced, and the substrate can be easily used for a gap inside a small electronic device.
- PET polyethylene terephthalate
- a heat conductive laminate for electronic equipment having excellent workability that is difficult to break during rework can be obtained.
- the total thickness of the double-sided pressure-sensitive adhesive tape that is, the total thickness of the base material and the adhesive layer is preferably 5 to 150 ⁇ m, more preferably 6 to 120 ⁇ m, still more preferably 7 to 110 ⁇ m.
- the total thickness of the double-sided pressure-sensitive adhesive tape is within the above range, the heat dissipation performance is improved, and further, the double-sided pressure-sensitive adhesive tape can be easily used for a gap inside a small electronic device.
- the double-sided pressure-sensitive adhesive tape is not particularly limited as long as it has the thickness of the base material.
- “3801X (PET base material thickness 4 ⁇ m)”, “3805H (PET base material) manufactured by Sekisui Chemical Co., Ltd. And 4038H (PET base material thickness 50 ⁇ m) ” can be preferably used.
- the manufacturing method of the heat conductive laminated body for electronic devices There is no restriction
- Ethylene-propylene-diene rubber (EPDM) Product name “EP21” manufactured by JSR Corporation Density: 0.86 g / cm 3 Propylene content: 34% by mass
- liquid EPDM Liquid ethylene-propylene-diene rubber
- PX-068 Liquid ethylene-propylene-diene rubber
- Example 1 A double-sided adhesive tape [“3801X” manufactured by Sekisui Chemical Co., Ltd. (PET substrate thickness 4 ⁇ m, double-sided adhesive tape total thickness 10 ⁇ m)] was applied to one side of the foam sheet obtained in Production Example 1. The heat conductive laminated body for electronic devices was obtained.
- Example 2 The same procedure as in Example 1 was performed except that the affixed double-sided adhesive tape was changed to “3805H” (PET base material thickness 40 ⁇ m, double-sided adhesive tape total thickness 50 ⁇ m) manufactured by Sekisui Chemical Co., Ltd.
- Example 3 The same procedure as in Example 1 was performed except that the affixed double-sided adhesive tape was changed to “3810H” (PET base material thickness 50 ⁇ m, double-sided adhesive tape total thickness 100 ⁇ m) manufactured by Sekisui Chemical Co., Ltd.
- Example 4 The same operation as in Example 1 was performed except that the foam sheet obtained in Production Example 2 was used.
- Example 5 The same procedure as in Example 3 was performed except that the foam sheet obtained in Production Example 2 was used.
- Comparative Example 1 An acrylic adhesive was applied to the foam sheet obtained in Production Example 1 to a thickness of 20 ⁇ m to obtain a foam sheet with an adhesive layer.
- Comparative Example 2 A nonwoven fabric base double-sided tape [Sekisui Chemical Co., Ltd. “# 5782” (nonwoven base material thickness 70 ⁇ m, non-woven base material double-sided tape total thickness 130 ⁇ m)] was applied to the foam sheet obtained in Production Example 1. As a result, a laminate was obtained. Comparative Example 3 A double-sided adhesive tape [Sekisui Chemical Co., Ltd. “3820BH” (PET base material thickness 130 ⁇ m, double-sided adhesive tape total thickness 200 ⁇ m)] was applied to one side of the foam sheet obtained in Production Example 1. A laminate was obtained.
- the heat conductive laminate for electronic equipment of the present invention has thinness, flexibility and heat conductivity, and is excellent in workability.
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Abstract
Description
また、熱伝導性発泡体は薄く柔軟性が良好であるため、薄型の電子機器内部の熱を外部に放熱する用途に適しているが、シリコーンのように自着性を有していないため粘着層を付与する必要がある。しかし、発泡体が柔らかく薄いため、被着面に一度貼付けてしまうとリワーク時に破れやすいという欠点があった。
本発明において用いる発泡体シートの25%圧縮強度は200kPa以下である。前記圧縮強度が200kPaを超えると、発泡体シートの柔軟性が低下するため好ましくない。発泡体シートの柔軟性の観点から、発泡体シートの25%圧縮強度は5kPa以上が好ましく、10kPa以上がより好ましく、15kPa以上が更に好ましく、20kPa以上がより更に好ましく、そして、190kPa以下が好ましく、180kPa以下がより好ましく、150kPa以下が更に好ましく、100kPa以下がより更に好ましく、50kPa以下がより更に好ましく、40kPa以下がより更に好ましい。
発泡体シートの25%圧縮強度は、発泡体シートの柔軟性の観点から、5~190kPaが好ましく、10~190kPaがより好ましく、15~150kPaがより好ましく、20~100kPaが更に好ましい。
本発明において用いる発泡体シートは、エラストマー樹脂を発泡させることにより得られたものである。
本発明に用いることができるエラストマー樹脂としては、アクリロニトリルブタジエンゴム、液状アクリロニトリルブタジエンゴム、エチレン-プロピレン-ジエンゴム、液状エチレン-プロピレン-ジエンゴム、エチレン-プロピレンゴム、液状エチレン-プロピレンゴム、天然ゴム、ポリブタジエンゴム、液状ポリブタジエンゴム、ポリイソプレンゴム、液状ポリイソプレンゴム、スチレン-ブタジエンブロック共重合体、液状スチレン-ブタジエンブロック共重合体、水素添加スチレン-ブタジエンブロック共重合体、液状水素添加スチレン-ブタジエンブロック共重合体、水素添加スチレン-ブタジエン-スチレンブロック共重合体、液状水素添加スチレン-ブタジエン-スチレンブロック共重合体、水素添加スチレン-イソプレンブロック共重合体、液状水素添加スチレン-イソプレンブロック共重合体、水素添加スチレン-イソプレン-スチレンブロック共重合体、液状水素添加スチレン-イソプレン-スチレンブロック共重合体等が挙げられ、これらの中では、アクリロニトリルブタジエンゴム、液状アクリロニトリルブタジエンゴム、エチレン-プロピレン-ジエンゴム、及び液状エチレン-プロピレン-ジエンゴムが好ましい。
エラストマー樹脂中の液状エラストマー含有量は、柔軟性を向上させる観点から、10質量%以上が好ましく、20質量%以上がより好ましく、そして、90質量%以下が好ましく、80質量%以下がより好ましい。
本発明においては、熱伝導性を向上させる観点から、前記発泡体シートを構成するエラストマー樹脂が熱伝導体を含有することが好ましい。
本発明に用いることができる熱伝導体としては、酸化アルミニウム、及び酸化マグネシウム等の酸化物、窒化ホウ素、及び窒化アルミニウム等の窒化物、グラファイト、及びグラフェン等の炭素化合物、及びタルクが挙げられ、これらの中では、酸化物、窒化物及びタルクから選ばれる1種以上が好ましく、酸化物から選ばれる1種以上がより好ましく、酸化アルミニウム及び酸化マグネシウムから選ばれる1種以上が更に好ましく、酸化マグネシウムがより更に好ましい。これらは、単独でもよく、2種以上を組み合わせて用いてもよい。
前記熱伝導体の熱伝導率としては、5W/m・K以上が好ましく、20W/m・K以上がより好ましい。熱伝導率が前記範囲内であれば、発泡体シートの熱伝導率が十分に高いものになる。
本発明における発泡体シートは、前記エラストマー樹脂と発泡剤とを混合し、化学的に発泡させることにより製造することが好ましい。
化学的に発泡させる場合における発泡剤としては、熱により分解してガスを発生する熱分解型発泡剤が好ましい。熱分解型発泡剤としては、例えば、アゾジカルボンアミド、ベンゼンスルホニルヒドラジド、ジニトロソペンタメチレンテトラミン、トルエンスルホニルヒドラジド、4,4-オキシビス(ベンゼンスルホニルヒドラジド)等が挙げられる。これらは、単独でもよく、2種以上を組み合わせて用いてもよい。
発泡剤の含有量は、前記エラストマー樹脂100質量部に対して、1~30質量部が好ましく、は3~25質量部がより好ましく、5~20質量部が更に好ましい。発泡剤の配合量が前記範囲内であれば、柔軟性に優れる発泡体を得ることができる。
本発明においては、本発明の目的を損なわない範囲で、必要に応じて各種の添加成分を含有させることができる。
この添加成分の種類は特に限定されず、発泡成形に通常使用される各種添加剤を用いることができる。このような添加剤として、例えば、滑剤、収縮防止剤、気泡核剤、結晶核剤、可塑剤、着色剤(顔料、染料等)、紫外線吸収剤、酸化防止剤、老化防止剤、上記導電付与材を除いた充填剤、補強剤、難燃剤、難燃助剤、帯電防止剤、界面活性剤、加硫剤、表面処理剤等が挙げられる。添加剤の添加量は、気泡の形成等を損なわない範囲で適宜選択でき、通常の樹脂の発泡・成形に用いられる添加量を採用できる。これらは、単独でもよく、2種以上を組み合わせて用いてもよい。
難燃助剤としては、三酸化アンチモン、四酸化アンチモン、五酸化アンチモン、ピロアンチモン酸ナトリウム、三塩化アンチモン、三硫化アンチモン、オキシ塩化アンチモン、二塩化アンチモンパークロロペンタン、アンチモン酸カリウム等のアンチモン化合物、メタホウ酸亜鉛、四ホウ酸亜鉛、ホウ酸亜鉛、塩基性ホウ酸亜鉛等のホウ素化合物、ジルコニウム酸化物、スズ酸化物、モリブデン酸化物等が挙げられる。
本発明に用いる発泡体シートは、公知の化学発泡法又は物理的発泡法により製造することができ、製造方法に特に制限はない。
なお、発泡処理方法は、プラスチックフォームハンドブック(牧広、小坂田篤編集 日刊工業新聞社発行 1973年)に記載されている方法を含め、公知の方法を用いることができる。
本発明の電子機器用熱伝導性積層体は、前記発泡体シートの少なくとも一方の面に両面粘着テープを貼付したものであり、両面粘着テープの基材は、厚さ2~100μmのポリエチレンテレフタレートで構成される。
両面粘着テープの基材の厚さが2μm未満であると基材が破れやすくなり積層体の作業性が悪くなる。両面粘着テープの基材の厚さは、積層体の作業性の観点から、3~100μmが好ましく、3~80μmがより好ましく、4~50μmが更に好ましい。基材の厚さが100μm以下であると、放熱性能が向上し、更に総厚さが小さくなり小型の電子機器内部の空隙に使用しやすくなる。
本発明においては、基材としてポリエチレンテレフタレート(以下、「PET」ともいう)を用いているため、リワーク時に破れにくい優れた作業性を有する電子機器用熱伝導性積層体を得ることができる。
本発明の電子機器用熱伝導性積層体を製造する方法に特に制限はなく、一般的な方法により製造することができる。例えば、発泡体シートと、両面粘着テープとをラミネートする方法を挙げることができる。なお、ラミネートは常温、常圧下で行ってもよく、また、加熱、加圧下で行ってもよい。
以下の製造例で使用した材料は以下のとおりである。
(1)エチレン-プロピレン-ジエンゴム(EPDM)
JSR株式会社製、商品名「EP21」
密度:0.86g/cm3
プロピレン含量:34質量%
(2)液状エチレン-プロピレン-ジエンゴム(液状EPDM)
三井化学株式会社製、商品名「PX-068」
密度:0.9g/cm3
プロピレン含量:39質量%
大塚化学株式会社製、商品名「SO-L」
(4)酸化マグネシウム
宇部マテリアルズ株式会社、商品名「RF-10C-SC」
破砕品45μm以下分級平均粒径4μm
熱伝導率:42~60W/m・K
(5)フェノール系酸化防止剤
BASFジャパン株式会社製、商品名「イルガノックス1010」
エチレン-プロピレン-ジエンゴム60質量部、液状エチレン-プロピレン-ジエンゴム40質量部、アゾジカルボンアミド17質量部、酸化マグネシウム360質量部、及びフェノール系酸化防止剤0.1質量部の混合物180gを溶融混練後、プレスすることにより厚さが0.4mmの発泡性樹脂シートを得た。得られた発泡性樹脂シートの両面に加速電圧500keVにて電子線を3.0Mrad照射して発泡性樹脂シートを架橋させた。次にシートを250℃に加熱することによって発泡性樹脂シートを発泡させて、見掛け密度0.60g/cm3、厚さ0.5mmの発泡体シートを得た。
エチレン-プロピレン-ジエンゴム50質量部、液状エチレン-プロピレン-ジエンゴム50質量部、アゾジカルボンアミド20質量部、酸化マグネシウム300質量部、及びフェノール系酸化防止剤0.1質量部の混合物180gを溶融混練後、プレスすることにより厚さが0.32mmの発泡性樹脂シートを得た。得られた発泡性樹脂シートの両面に加速電圧500keVにて電子線を3.0Mrad照射して発泡性樹脂シートを架橋させた。次にシートを250℃に加熱することによって発泡性樹脂シートを発泡させて、見掛け密度0.35g/cm3、厚さ0.5mmの発泡体シートを得た。
製造例1で得られた発泡体シートの一方の面に両面粘着テープ[積水化学工業株式会社製「3801X」(PET基材の厚さ4μm、両面粘着テープの総厚さ10μm)]を貼付し、電子機器用熱伝導性積層体を得た。
貼付した両面粘着テープを、積水化学工業株式会社製「3805H」(PET基材の厚さ40μm、両面粘着テープの総厚さ50μm)に変更したこと以外は実施例1と同様に実施した。
貼付した両面粘着テープを、積水化学工業株式会社製「3810H」(PET基材の厚さ50μm、両面粘着テープの総厚さ100μm)に変更したこと以外は実施例1と同様に実施した。
製造例2で得られた発泡体シートを使用したこと以外は、実施例1と同様に実施した。
実施例5
製造例2で得られた発泡体シートを使用したこと以外は、実施例3同様に実施した。
製造例1で得られた発泡体シートにアクリル系の粘着剤を20μm塗布し、粘着層付発泡体シートを得た。
製造例1で得られた発泡体シートに不織布基材両面テープ[積水化学工業株式会社製「#5782」(不織布基材の厚さ70μm、不織布基材両面テープの総厚さ130μm)]を貼付し、積層体を得た。
比較例3
製造例1で得られた発泡体シートの一方の面に両面粘着テープ[積水化学工業株式会社製「3820BH」(PET基材の厚さ130μm、両面粘着テープの総厚さ200μm)]を貼付し、積層体を得た。
得られた発泡体シートの物性は以下のように測定した。各測定結果は表1に示す。
〔発泡倍率〕
発泡倍率は、発泡体シ-トの比重を発泡性樹脂シートの比重で除することにより算出した。
〔見掛け密度〕
JIS K 7222に準拠して測定した。
発泡体シートの厚さ方向の25%圧縮強度は、JIS K6767-7.2.3(JIS2009)に準拠して測定した。
〔発泡体シートの熱伝導率〕
レーザーフラッシュ法により、アルバック理工株式会社製「TC-7000」を用いて、未発泡樹脂シートの熱伝導率を25℃にて測定し、該見かけ密度から下記数式により計算値として発泡体シートの熱伝導率を算出した。
1/λe={(1-V1/3)/λS}+V1/3/{λS・(1-V2/3)+λg・V2/3}
λe:発泡体シートの熱伝導率
V:発泡体の気孔率(気孔率=1-〔1/発泡倍率〕)
λS:未発泡樹脂シートの熱伝導率
λg:空気の熱伝導率
実施例及び比較例で得られた積層体の最大抗張力を、引張試験機を用いてJIS K6767(A法)に準拠して行った。
実施例と比較例で得られたシートの熱伝導性は図1に示した積層構造を用いて測定した。具体的には、断熱材の上に25mm×25mm×2mmのヒーター(坂口電熱株式会社製マイクロセラミックヒーター、型番「MS5」)を載せ、その上に25mm×25mmの各実施例及び比較例で作成したサンプルを重ねた。その上に50mm×100mm×2mmのアルミニウム板を載せ、サンプルを伝わった熱がアルミニウム板に拡散する構造を形成した。この状態でヒーターに1Wの電力を引加し、15分後にヒーターの温度が一定となったところで当該ヒーターの温度[T](℃)を測定した。値が小さい程、熱伝導性能がよいことを示す。
Claims (5)
- 25%圧縮強度が200kPa以下であり、厚さが0.05~1.0mmである発泡体シートの少なくとも一方の面に、両面粘着テープを貼付した電子機器用熱伝導性積層体であり、前記両面粘着テープの基材が厚さ2~100μmのポリエチレンテレフタレートである電子機器用熱伝導性積層体。
- 前記発泡体シートを構成するエラストマー樹脂が、酸化物、窒化物及びタルクから選ばれる1種以上の熱伝導体を含有する、請求項1に記載の電子機器用熱伝導性積層体。
- 前記熱伝導体の含有量が、前記エラストマー樹脂100質量部に対して100~500質量部である、請求項2に記載の電子機器用熱伝導性積層体。
- 前記発泡体シートの発泡倍率が1.5~6倍である、請求項1~3のいずれかに記載の電子機器用熱伝導性積層体。
- 前記両面粘着テープの基材の厚さが3~100μmである、請求項1~4のいずれかに記載の電子機器用熱伝導性積層体。
Priority Applications (5)
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JP2016510549A JP6491641B2 (ja) | 2014-03-28 | 2015-03-27 | 電子機器用熱伝導性積層体 |
CN201580011287.0A CN106068182A (zh) | 2014-03-28 | 2015-03-27 | 电子设备用导热性叠层体 |
KR1020167026113A KR20160138409A (ko) | 2014-03-28 | 2015-03-27 | 전자기기용 열전도성 적층체 |
EP15767842.6A EP3124241A4 (en) | 2014-03-28 | 2015-03-27 | Heat-conducting laminate for electronic device |
US15/122,521 US20170072666A1 (en) | 2014-03-28 | 2015-03-27 | Heat-conducting laminate for electronic device |
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EP (1) | EP3124241A4 (ja) |
JP (1) | JP6491641B2 (ja) |
KR (1) | KR20160138409A (ja) |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2017079264A (ja) * | 2015-10-20 | 2017-04-27 | 積水化学工業株式会社 | 電子機器用熱伝導性シート |
WO2018056407A1 (ja) * | 2016-09-23 | 2018-03-29 | 積水化学工業株式会社 | 多孔質体 |
Families Citing this family (1)
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US20160356731A1 (en) * | 2015-06-05 | 2016-12-08 | Probe Holdings, Inc. | Thermal conductivity quartz transducer with waste-heat management system |
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WO2014192460A1 (ja) * | 2013-05-27 | 2014-12-04 | Dic株式会社 | 両面粘着テープ |
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2015
- 2015-03-27 US US15/122,521 patent/US20170072666A1/en not_active Abandoned
- 2015-03-27 CN CN201580011287.0A patent/CN106068182A/zh active Pending
- 2015-03-27 TW TW104110148A patent/TW201540517A/zh unknown
- 2015-03-27 WO PCT/JP2015/059589 patent/WO2015147254A1/ja active Application Filing
- 2015-03-27 KR KR1020167026113A patent/KR20160138409A/ko unknown
- 2015-03-27 EP EP15767842.6A patent/EP3124241A4/en not_active Withdrawn
- 2015-03-27 JP JP2016510549A patent/JP6491641B2/ja active Active
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WO2018056407A1 (ja) * | 2016-09-23 | 2018-03-29 | 積水化学工業株式会社 | 多孔質体 |
JP6346384B1 (ja) * | 2016-09-23 | 2018-06-20 | 積水化学工業株式会社 | 多孔質体 |
Also Published As
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JP6491641B2 (ja) | 2019-03-27 |
CN106068182A (zh) | 2016-11-02 |
TW201540517A (zh) | 2015-11-01 |
EP3124241A1 (en) | 2017-02-01 |
KR20160138409A (ko) | 2016-12-05 |
JPWO2015147254A1 (ja) | 2017-04-13 |
EP3124241A4 (en) | 2017-10-18 |
US20170072666A1 (en) | 2017-03-16 |
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