WO2015151604A1 - 熱伝導性シート、及び熱伝導性シートの製造方法 - Google Patents
熱伝導性シート、及び熱伝導性シートの製造方法 Download PDFInfo
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- WO2015151604A1 WO2015151604A1 PCT/JP2015/053958 JP2015053958W WO2015151604A1 WO 2015151604 A1 WO2015151604 A1 WO 2015151604A1 JP 2015053958 W JP2015053958 W JP 2015053958W WO 2015151604 A1 WO2015151604 A1 WO 2015151604A1
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- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
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- B32B7/04—Interconnection of layers
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- H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
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- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
- H01L21/4814—Conductive parts
- H01L21/4871—Bases, plates or heatsinks
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- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
- H01L23/3735—Laminates or multilayers, e.g. direct bond copper ceramic substrates
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- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/42—Fillings or auxiliary members in containers or encapsulations selected or arranged to facilitate heating or cooling
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Definitions
- the present invention relates to an acrylic heat conductive sheet used for heat dissipation measures for electronic parts and the like, and a method for manufacturing the heat conductive sheet.
- the heat conductive sheet may use a heat conductive resin layer having excellent flexibility, but the heat conductive resin layer having excellent flexibility may be used at the time of use. It may be stretched or cut and difficult to handle. For this reason, the support sheet which reinforces a heat conductive resin layer is used.
- the acrylic heat conductive resin layer is easily peeled off. For this reason, it is necessary to perform primer treatment on the PET film, and the number of steps increases.
- the present invention has been proposed in view of such conventional circumstances, and provides a thermally conductive sheet excellent in adhesion between an acrylic resin layer and a support sheet, and a method for producing the same.
- the present inventor improves the adhesion between the acrylic resin layer and the support sheet by using a support sheet containing a polyvinyl acetal resin and a styrene-vinyl isoprene block copolymer. I found out.
- the heat conductive sheet according to the present invention has a heat conductive resin layer made of an acrylic heat conductive composition, a polyvinyl acetal resin, and a support resin layer containing a styrene-vinyl isoprene block copolymer. It is characterized by.
- the support sheet according to the present invention is characterized by containing a polyvinyl acetal resin and a styrene-vinyl isoprene block copolymer.
- the method for producing a heat conductive sheet according to the present invention includes a step of mixing a polyvinyl acetal resin and a styrene-vinyl isoprene block copolymer, forming a sheet into a support resin layer, and an acrylic heat conductive composition. Curing a product in contact with the support resin layer to form a heat conductive resin layer.
- the method for producing a support sheet according to the present invention is characterized in that a polyvinyl acetal resin and a styrene-vinyl isoprene block copolymer are mixed to form a sheet.
- the support resin layer containing the polyvinyl acetal resin and the styrene-vinyl isoprene block copolymer is crosslinked with the acrylic monomer of the acrylic resin layer, the adhesion between the acrylic resin layer and the support sheet is increased. Can be improved.
- FIG. 1 is a cross-sectional view showing an example of a thermally conductive sheet according to an embodiment of the present invention.
- FIG. 2 is an explanatory diagram of a method for measuring the T-type peel strength between the heat conductive resin layer and the support resin layer.
- a heat conductive sheet includes a heat conductive resin layer made of an acrylic heat conductive composition, a polyvinyl acetal resin, and a support resin layer containing a styrene-vinyl isoprene block copolymer. Is provided.
- the preferable thickness of the heat conductive sheet is 0.1 mm or more and 10.0 mm or less, and the preferable thickness of the support resin layer is 0.001 mm or more and 0.500 mm or less.
- FIG. 1 is a cross-sectional view showing an example of a thermally conductive sheet according to an embodiment of the present invention.
- This heat conductive sheet includes a heat conductive resin layer 11 obtained by curing an acrylic heat conductive composition, and a support resin layer 12 that supports the heat conductive resin layer 11. Moreover, the peeling film 13 peeled at the time of use is affixed on the heat conductive resin layer 11 surface.
- the heat conductive resin layer 11 is obtained by curing an acrylic heat conductive composition.
- the preferable thermal conductivity of the heat conductive resin layer 11 is 0.3 W / m ⁇ K or more.
- the preferable compression rate when the load of the heat conductive resin layer 11 is 1 kgf / cm 2 is 1% or more and 80% or less. The higher the compression ratio, the better the flexibility and the better the adhesion to the heating element and the heat dissipation element.
- the preferable Asker C hardness (JISK 7312) of the heat conductive resin layer 11 is 5 or more and 60 or less.
- acrylic heat conductive composition a conventionally known acrylic heat conductive composition can be used.
- A monofunctional (meth) acrylate,
- B polyfunctional (meth) acrylate,
- C photopolymerization initiator,
- D thermally conductive particles,
- E plasticizer,
- An acrylic heat conductive composition containing F) a thiol compound can be mentioned.
- an alkyl (meth) acrylate having a linear or branched alkyl group is preferably used as the monofunctional (meth) acrylate.
- alkyl (meth) acrylate examples include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, and sec-butyl (meth).
- polyfunctional (meth) acrylate examples include 1,3-butanediol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, neopentanediol di (meth) acrylate, and 1,6-hexanediol.
- photopolymerization initiator examples include benzophenone series, benzoin series, benzoin alkyl ether series, benzyl dimethyl ketal series, ⁇ -hydroxyketone series, acylphosphine oxide series, etc., and one or more of these should be used. Can do.
- Thermally conductive particles include metal hydroxides such as aluminum hydroxide and magnesium hydroxide, metals such as aluminum, copper and silver, metal oxides such as alumina and magnesia, nitriding such as aluminum nitride, boron nitride and silicon nitride Products, carbon nanotubes, etc., and one or more of these can be used.
- metal hydroxides such as aluminum hydroxide and magnesium hydroxide
- metals such as aluminum, copper and silver
- metal oxides such as alumina and magnesia
- nitriding such as aluminum nitride, boron nitride and silicon nitride Products, carbon nanotubes, etc., and one or more of these can be used.
- the content of the heat conductive particles in the acrylic heat conductive composition is 100 parts by mass or more and 2000 parts by mass, preferably 300 parts by mass or more and 650 parts by mass or less with respect to 100 parts by mass of the monofunctional (meth) acrylate. If the content of the heat conductive particles is too small, it is difficult to sufficiently increase the heat conductivity of the heat conductive sheet. If the content of the heat conductive particles is too large, the flexibility of the heat conductive sheet is reduced. Tend to. Further, when two kinds of thermally conductive fillers having different average particle diameters are used, the blending ratio of the small diameter filler and the large diameter filler is preferably 15:85 to 90:10.
- adipic acid ester for example, at least one selected from adipic acid ester, pimelic acid ester, suberic acid ester, azelaic acid ester, and sebacic acid ester can be used.
- dicarboxylic acid esters include adipic acid (HOOC— (CH 2 ) 4 —COOH), pimelic acid (HOOC— (CH 2 ) 5 —COOH), suberic acid (HOOC— (CH 2 ) 6 —COOH), It can be obtained by esterifying a dicarboxylic acid selected from azelaic acid (HOOC— (CH 2 ) 7 —COOH) and sebacic acid (HOOC— (CH 2 ) 8 —COOH) with an alcohol by a conventional method.
- plasticizer examples include diisodecyl adipate, diisodecyl pimelate, diisodecyl suberate, obtained by esterifying one selected from adipic acid, pimelic acid, suberic acid, azelaic acid, and sebacic acid with isodecyl alcohol. It is preferable to use at least one selected from diisodecyl azelate and diisodecyl sebacate.
- thiol compound a bifunctional or higher polyfunctional thiol is used.
- polyfunctional thiol having 2 or more functional groups include 1,3,5-tris (3-mercaptobutyloxyethyl) -1,3,5-triazine-2,4,6 (1H, 3H, 5H) -trione, -Methyl-2-((3-mercapto-1-oxopropyl) -methyl) propane-1,3-diylbis (3-mercaptopropionate), trimethylolpropane tristhiopropionate, trimethylolpropane tristhioglycol
- Trifunctional thiol compounds such as 2,4,6-trimercapto-S-triazine, pentaerythritol tetrakis (3-mercaptobutyrate), pentaerythritol tetrakisthioglycolate, dipentaerythritol tetrakisthioglycolate
- an antioxidant e.g., a heat deterioration inhibitor, a flame retardant, a colorant, and the like can be blended in the acrylic heat conductive composition as other components.
- antioxidants examples include a primary antioxidant that captures radicals generated by thermal degradation, and a secondary antioxidant that decomposes peroxides generated by thermal degradation. These may be used alone or in combination of two types. You may use the above together.
- heat deterioration preventing agent examples include acrylic acid monoester of 1,1-bis (2-hydroxy-3,5-di-tert-pentylphenyl) methane.
- acrylic heat conductive composition is not limited to the above-described configuration, and other acrylic heat conductive compositions may be used.
- examples of commercially available products include Transcool Series GNS (Inoac Corporation), Siroquinone Series (Taika Co., Ltd.), 5580H (Sumitomo 3M Co., Ltd.), and the like.
- the support resin layer 12 is a support sheet containing a polyvinyl acetal resin and a styrene-vinyl isoprene block copolymer.
- the polyvinyl acetal resin is obtained by acetalizing polyvinyl alcohol with an aldehyde.
- Polyvinyl alcohol is obtained, for example, by saponifying polyvinyl acetate, and the saponification degree is generally 80 mol% or more and 99.8 mol% or less.
- the polymerization degree of polyvinyl alcohol is generally 200 or more and 3000 or less.
- the aldehyde include formaldehyde, acetaldehyde, n-butyraldehyde, isobutyraldehyde, n-hexyl aldehyde, n-valeraldehyde, and the like, and one or more of these can be used.
- polyvinyl acetal or polyvinyl butyral obtained by reacting polyvinyl alcohol with acetaldehyde or butyraldehyde can be suitably used.
- the molecular weight of the polyvinyl acetal resin is 5 ⁇ 10 4 or more and 20 ⁇ 10 4 or less, more preferably 8 ⁇ 10 4 or more and 15 ⁇ 10 4 or less. If the molecular weight is too low, adhesiveness may be developed and the dryness of the support sheet may be reduced, and if the molecular weight is too high, the flexibility of the support sheet may be reduced.
- the glass transition temperature (Tg) of the polyvinyl acetal resin is 50 ° C. or higher and 150 ° C. or lower, more preferably 80 ° C. or higher and 120 ° C. or lower. If the glass transition temperature is too low, tackiness may be developed and the dryness of the support sheet may be reduced, and if the glass transition temperature is too high, the flexibility of the support sheet may be reduced.
- the degree of acetalization of the polyvinyl acetal resin is 50 mol% or more and 90 mol% or less, more preferably 60 mol% or more and 80 mol% or less. If the degree of acetalization is too low, the compatibility with the styrene-vinylisoprene block copolymer may be lowered, and if the degree of acetalization is too high, the heat resistance of the support sheet may be lowered.
- the degree of acetalization is a value indicating the mole fraction obtained by dividing the amount of ethylene groups to which acetal groups are bonded by the total amount of ethylene groups in the main chain as a percentage.
- the degree of acetalization was determined by measuring the degree of acetylation (acetyl group content) and the hydroxyl group content (vinyl alcohol content) according to JIS K6728 “Testing methods for polyvinyl butyral”. The rate can be calculated and then calculated by subtracting the degree of acetylation and the hydroxyl group content from 100 mol%.
- polyvinyl acetal resins examples include ESREC BX-1, BX-5, KS-3, and KS-5 (Sekisui Chemical Co., Ltd.).
- the styrene-vinyl isoprene block copolymer is a triblock copolymer composed of a styrene block and a vinyl-polyisoprene block, and is a thermoplastic elastomer having a styrene unit as a hard segment and a vinyl isoprene unit as a soft segment.
- the styrene content of the styrene-vinyl isoprene block copolymer is 10% to 30%, preferably 15% to 25%. If the styrene content is too small, the hard segment may be insufficient and rubber elasticity may be reduced, and if the styrene content is too high, the flexibility of the support sheet may be reduced.
- the glass transition temperature (Tg) of the styrene-vinyl isoprene block copolymer is ⁇ 40 ° C. or higher and + 40 ° C. or lower, preferably ⁇ 20 ° C. or higher and + 20 ° C. or lower. If the glass transition temperature is too low, tackiness may be developed and the dryness of the support sheet may be reduced, and if the glass transition temperature is too high, the flexibility of the support sheet may be reduced.
- Examples of such commercially available styrene-vinyl isoprene block copolymers include HIBLER 5125 and 5127 (Kuraray Co., Ltd.).
- the polyvinyl acetal and the styrene-vinyl isoprene block copolymer are preferably blended in a mass ratio of 9: 1 to 7: 3. If the blending amount of the styrene-vinylisoprene block copolymer is too small, adhesion to the heat conductive resin layer cannot be obtained, and if the blending amount of the styrene-vinylisoprene block copolymer is too large, the dryness of the support sheet is achieved. May decrease or the strength may decrease.
- a crosslinking agent may be added to the support resin layer 12.
- a crosslinking agent an isocyanate type crosslinking agent, an epoxy type crosslinking agent, a silicone type crosslinking agent, etc. are mentioned, These 1 type (s) or 2 or more types can be used.
- the surface of the support resin layer 12 is preferably rough. Since the surface of the support resin layer 12 is rough, the surface area in contact with the heat conductive resin increases and the crosslinking point of the vinyl group increases, so that the adhesion can be improved by the anchor effect.
- a release agent such as silicone applied to PET (Polyethylene Terephthalate), OPP (Oriented Polypropylene), PMP (Poly-4-methylpentene-1), PTFE (Polytetrafluoroethylene) or the like can be used.
- PET Polyethylene Terephthalate
- OPP Oriented Polypropylene
- PMP Poly-4-methylpentene-1
- PTFE Polytetrafluoroethylene
- the support resin layer containing the polyvinyl acetal resin and the styrene-vinyl isoprene block copolymer is cross-linked with the acrylic monomer of the acrylic heat conductive resin layer. Adhesion between the resin layer and the support sheet can be improved. Moreover, since the surface of a support sheet is dry, workability
- the support resin layer is provided on one side of the heat conductive resin layer.
- the support resin layer may be provided on both sides of the heat conductive resin layer.
- a conductive resin layer may be provided.
- the support sheet was applied to the heat conductive sheet, it is not restricted to this. For example, you may use a support sheet as a support material of an acrylic adhesive tape or an adhesive tape.
- a method for producing a thermally conductive sheet according to an embodiment of the present invention includes a step of mixing a polyvinyl acetal resin and a styrene-vinyl isoprene block copolymer, forming a sheet and forming a support resin layer, an acrylic system Curing the heat conductive composition in contact with the support resin layer to form a heat conductive resin layer.
- the styrene-vinylisoprene block copolymer is added to the polyvinyl acetal resin in an amount of 10 parts by mass to 65 parts by mass, preferably 10 parts by mass to 45 parts by mass with respect to 100 parts by mass of the polyvinyl acetal resin. It adds and mixes so that it may become below a mass part, and a support resin composition is prepared. Sheeting is performed, for example, by uniformly applying the support resin composition on a release film with a bar coater and drying.
- the polyvinyl acetal resin and the styrene-vinyl isoprene block copolymer are thermoplastic resins, they can be formed into a sheet without using a solvent such as an injection molding method, an extrusion molding method, or a kneading method.
- the acrylic heat conductive composition is cured in contact with the support resin layer.
- the vinyl group part of the styrene-vinyl isoprene block copolymer of the support resin layer and the acrylic monomer part of the acrylic heat conductive composition are compatible with each other or cured to be integrated, Adhesion can be improved.
- a conventional curing method such as light, heat, or a solvent can be used, but it is preferable to use at least one of light or heat.
- the acrylic heat conductive composition may be cured while being sandwiched between two support sheets, and the acrylic heat conductive composition is applied to both surfaces of the support sheet. It may be cured.
- the heat conductive resin layer and the support resin layer can be firmly bonded by curing the acrylic heat conductive composition.
- Example> Examples of the present invention will be described below.
- a support resin layer was formed by mixing polyvinyl acetal and a styrene-vinyl isoprene block copolymer at a predetermined mass ratio.
- the heat conductive resin layer which hardened the acrylic heat conductive composition was formed on the support resin layer, and the heat conductive sheet was produced. And about each heat conductive sheet, tensile strength, T-type peeling strength of a support resin layer and a heat conductive resin layer, and the surface tack of a support resin layer were measured and evaluated.
- the present invention is not limited to these examples.
- a support resin composition was obtained by mixing polyvinyl acetal (ESLEC BX-1, Sekisui Chemical Co., Ltd.) and styrene-vinylisoprene block copolymer (Hibler 5125, Kuraray Co., Ltd.) at a predetermined mass ratio.
- This support resin composition was applied to a release film made of PET with a bar coater to form a support resin layer having a thickness of 0.01 mm.
- An acrylic heat conductive composition is applied on the support resin layer, and ultraviolet rays are irradiated simultaneously at an irradiation intensity of 1 mW / cm 2 from both sides of the acrylic heat conductive composition surface and the support resin layer surface for 5 minutes on the support resin layer.
- a heat conductive resin layer was formed, and a heat conductive sheet composed of a support resin layer having a thickness of 0.01 mm and a heat conductive resin layer having a thickness of 1.0 mm was produced.
- a heat conductive sheet composed of the heat conductive resin layer 11 and the support resin layer 12 is processed by a hand press using a punching die (dumbbell shape No. 3) having a narrowest width of 5 mm and a narrowest portion of 20 mm in length.
- a sample was prepared.
- the strength (value obtained by dividing the tensile load value by the cross-sectional area of the test piece) when this sample was pulled at a speed of 500 mm / min and cut (ruptured) using a tensile tester (RTG-1225, Orientec). It was measured.
- Those having a tensile strength of 0.4 MPa or more were evaluated as “ ⁇ ”, and those having a tensile strength of less than 0.4 MPa were evaluated as “x”.
- a tackiness tester As a tackiness tester, a RHESCA company tacking tester TAC-II is used, and a 10 mm diameter aluminum cylindrical probe is pressed on the supporting resin layer at a pressing speed of 30 mm / min, a peeling speed of 120 mm / min, a load of 196 g, The probe tack was measured when it was pressed and peeled off under the conditions of pressing time 5.0 seconds, pulling distance 5 mm, and no probe heating.
- Those tack support resin layer is less than 10 kN / m 2 " ⁇ ", " ⁇ " and of less than 10 kN / m 2 or more 15 kN / m 2, and 15 kN / m 2 or more ones were evaluated as " ⁇ " .
- ⁇ Comparative Example 1> A heat conductive sheet was prepared as described above except that the supporting resin layer was formed by mixing polyvinyl acetal and styrene-vinyl isoprene block copolymer in a mass ratio of 10: 0. As shown in Table 1, the tensile strength evaluation of Comparative Example 1 was ⁇ , the T-type peel strength evaluation was ⁇ , and the surface tack evaluation was ⁇ .
- Example 1 A heat conductive sheet was prepared as described above except that the supporting resin layer was formed by mixing polyvinyl acetal and styrene-vinyl isoprene block copolymer in a mass ratio of 9: 1. As shown in Table 1, the evaluation of the tensile strength of Example 1 was ⁇ , the evaluation of the T-type peel strength was ⁇ , and the evaluation of the surface tack was ⁇ .
- Example 2 A heat conductive sheet was prepared as described above except that the support resin layer was formed by mixing polyvinyl acetal and styrene-vinyl isoprene block copolymer at a mass ratio of 8.5: 1.5. As shown in Table 1, the evaluation of the tensile strength of Example 2 was ⁇ , the evaluation of the T-type peel strength was ⁇ , and the evaluation of the surface tack was ⁇ .
- Example 3 A heat conductive sheet was prepared as described above except that the support resin layer was formed by mixing polyvinyl acetal and styrene-vinyl isoprene block copolymer at a mass ratio of 8: 2. As shown in Table 1, the evaluation of the tensile strength of Example 3 was ⁇ , the evaluation of the T-type peel strength was ⁇ , and the evaluation of the surface tack was ⁇ .
- Example 4 A heat conductive sheet was prepared as described above, except that the support resin layer was formed by mixing polyvinyl acetal and styrene-vinyl isoprene block copolymer in a mass ratio of 7: 3. As shown in Table 1, the evaluation of the tensile strength of Example 4 was ⁇ , the evaluation of the T-type peel strength was ⁇ , and the evaluation of the surface tack was ⁇ .
- ⁇ Comparative example 2> A heat conductive sheet was prepared as described above except that the supporting resin layer was formed by mixing polyvinyl acetal and styrene-vinyl isoprene block copolymer in a mass ratio of 0:10. As shown in Table 1, the evaluation of the tensile strength of Comparative Example 2 was x, the evaluation of the T-type peel strength was ⁇ , and the evaluation of the surface tack was x.
- ⁇ Comparative Example 3> Except that a support resin layer was formed by mixing polyvinyl acetal and a styrene-ethylene / butylene-styrene block copolymer (Septon V9827, Kuraray Co., Ltd.) at a mass ratio of 9: 1, heat conduction was performed as described above. Sheet was prepared. As shown in Table 1, the tensile strength evaluation of Comparative Example 3 was ⁇ , the T-type peel strength evaluation was ⁇ , and the surface tack evaluation was ⁇ .
- ⁇ Comparative example 4> Except that a support resin layer was formed by mixing polyvinyl acetal and a styrene-ethylene / butylene-styrene block copolymer (Septon V9827, Kuraray Co., Ltd.) in a mass ratio of 7: 3, heat conduction was performed as described above. Sheet was prepared. As shown in Table 1, the evaluation of the tensile strength of Comparative Example 4 was ⁇ , the evaluation of the T-type peel strength was ⁇ , and the evaluation of the surface tack was ⁇ .
- ⁇ Comparative Example 5> Except that a support resin layer was formed by mixing polyvinyl acetal and a styrene-ethylene / butylene-styrene block copolymer (Septon V9827, Kuraray Co., Ltd.) in a mass ratio of 3: 7, heat conduction was performed as described above. Sheet was prepared. As shown in Table 1, the evaluation of the tensile strength of Comparative Example 5 was x, the evaluation of the T-type peel strength was x, and the evaluation of the surface tack was x.
- the heat conductive resin layer is formed by mixing polyvinyl acetal and styrene-vinylisoprene block copolymer in a mass ratio of 9: 1 to 7: 3 as in Examples 1 to 4, the heat conductive resin layer
- the delamination strength between the resin and the supporting resin layer was large, and excellent adhesion could be obtained.
- the tensile strength of the heat conductive sheet was large, and the dryness of the support resin layer could be maintained.
Abstract
Description
1.熱伝導性シート
2.熱伝導性シートの製造方法
3.実施例
本発明の一実施の形態に係る熱伝導性シートは、アクリル系熱伝導組成物からなる熱伝導樹脂層と、ポリビニルアセタール樹脂と、スチレン-ビニルイソプレンブロック共重合体とを含有する支持樹脂層とを備える。熱伝導性シートの好ましい厚みは、0.1mm以上10.0mm以下であり、支持樹脂層の好ましい厚みは、0.001mm以上0.500mm以下である。
本発明の一実施の形態に係る熱伝導性シートの製造方法は、ポリビニルアセタール樹脂と、スチレン-ビニルイソプレンブロック共重合体とを混合し、シート化して支持樹脂層を形成する工程と、アクリル系熱伝導組成物を前記支持樹脂層と接触させた状態で硬化させ、熱伝導樹脂層を形成する工程とを有する。
以下、本発明の実施例について説明する。本実施例では、ポリビニルアセタールとスチレン-ビニルイソプレンブロック共重合体とを所定の質量割合で混合して支持樹脂層を形成した。次に、支持樹脂層上にアクリル系熱伝導組成物を硬化させた熱伝導樹脂層を形成し、熱伝導性シートを作製した。そして、各熱伝導性シートについて、引張強度、支持樹脂層と熱伝導樹脂層とのT型剥離強度、及び支持樹脂層の表面タックを測定し、評価した。なお、本発明はこれらの実施例に限定されるものではない。
ポリビニルアセタール(エスレックBX-1、積水化学(株))とスチレン-ビニルイソプレンブロック共重合体(ハイブラー5125、(株)クラレ)とを所定の質量割合で混合して支持樹脂組成物を得た。この支持樹脂組成物をバーコーターでPETからなる剥離フィルムに塗布し、厚み0.01mmの支持樹脂層を形成した。
熱伝導樹脂層11と支持樹脂層12とからなる熱伝導性シートを、最狭幅5mm、最狭部の長さ20mmの打ち抜き型(ダンベル状3号)を用い、ハンドプレスを使って加工して試料を作製した。この試料を引張試験機(RTG-1225、オリエンテック社)を用いて、速度500mm/minで引っ張り、切断(破断)したときの強度(引張荷重値を試験片の断面積で除した値)を測定した。引張強度が0.4MPa以上のものを「○」と評価し、0.4MPa未満のものを「×」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2に示すように、熱伝導樹脂層11にPETからなる剥離フィルム13Aが貼り付けられ、支持樹脂層12にPETからなる剥離フィルム13Bが貼り付けられたままの状態で、熱伝導樹脂層11と支持樹脂層12との層間剥離強度をT型剥離試験により測定した。このときの引張速度は300mm/min、サンプル幅は15mmとした。層間剥離強度が0.2N/20mm以上のものを「○」、0.2N/20mm未満0.15N/20mm以上のものを「△」、及び0.15N/20mm未満のものを「×」と評価した。
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、支持樹脂層に、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、プローブ加熱なし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。支持樹脂層のタックが10kN/m2未満のものを「○」、10kN/m2以上15kN/m2未満のものを「△」、及び15kN/m2以上のものを「×」と評価した。
ポリビニルアセタールとスチレン-ビニルイソプレンブロック共重合体とを10:0の質量割合で混合して支持樹脂層を形成した以外は、前述のように熱伝導性シートを作製した。表1に示すように、比較例1の引張強度の評価は○、T型剥離強度の評価は×、及び表面タックの評価は○であった。
ポリビニルアセタールとスチレン-ビニルイソプレンブロック共重合体とを9:1の質量割合で混合して支持樹脂層を形成した以外は、前述のように熱伝導性シートを作製した。表1に示すように、実施例1の引張強度の評価は○、T型剥離強度の評価は△、及び表面タックの評価は○であった。
ポリビニルアセタールとスチレン-ビニルイソプレンブロック共重合体とを8.5:1.5の質量割合で混合して支持樹脂層を形成した以外は、前述のように熱伝導性シートを作製した。表1に示すように、実施例2の引張強度の評価は○、T型剥離強度の評価は○、及び表面タックの評価は○であった。
ポリビニルアセタールとスチレン-ビニルイソプレンブロック共重合体とを8:2の質量割合で混合して支持樹脂層を形成した以外は、前述のように熱伝導性シートを作製した。表1に示すように、実施例3の引張強度の評価は○、T型剥離強度の評価は○、及び表面タックの評価は○であった。
ポリビニルアセタールとスチレン-ビニルイソプレンブロック共重合体とを7:3の質量割合で混合して支持樹脂層を形成した以外は、前述のように熱伝導性シートを作製した。表1に示すように、実施例4の引張強度の評価は○、T型剥離強度の評価は○、及び表面タックの評価は△であった。
ポリビニルアセタールとスチレン-ビニルイソプレンブロック共重合体とを0:10の質量割合で混合して支持樹脂層を形成した以外は、前述のように熱伝導性シートを作製した。表1に示すように、比較例2の引張強度の評価は×、T型剥離強度の評価は○、及び表面タックの評価は×であった。
ポリビニルアセタールとスチレン-エチレン/ブチレン-スチレンブロック共重合体(セプトンV9827、(株)クラレ)とを9:1の質量割合で混合して支持樹脂層を形成した以外は、前述のように熱伝導性シートを作製した。表1に示すように、比較例3の引張強度の評価は○、T型剥離強度の評価は×、及び表面タックの評価は○であった。
ポリビニルアセタールとスチレン-エチレン/ブチレン-スチレンブロック共重合体(セプトンV9827、(株)クラレ)とを7:3の質量割合で混合して支持樹脂層を形成した以外は、前述のように熱伝導性シートを作製した。表1に示すように、比較例4の引張強度の評価は○、T型剥離強度の評価は×、及び表面タックの評価は○であった。
ポリビニルアセタールとスチレン-エチレン/ブチレン-スチレンブロック共重合体(セプトンV9827、(株)クラレ)とを3:7の質量割合で混合して支持樹脂層を形成した以外は、前述のように熱伝導性シートを作製した。表1に示すように、比較例5の引張強度の評価は×、T型剥離強度の評価は×、及び表面タックの評価は×であった。
ポリビニルアセタールとスチレン-エチレン/ブチレン-スチレンブロック共重合体(セプトンV9827、(株)クラレ)とを0:10の質量割合で混合して支持樹脂層を形成した以外は、前述のように熱伝導性シートを作製した。表1に示すように、比較例6の引張強度の評価は×、T型剥離強度の評価は×、及び表面タックの評価は×であった。
Claims (20)
- アクリル系熱伝導組成物からなる熱伝導樹脂層と、
ポリビニルアセタール樹脂と、スチレン-ビニルイソプレンブロック共重合体とを含有する支持樹脂層と
を備える熱伝導性シート。 - 前記ポリビニルアセタールと前記スチレン-ビニルイソプレンブロック共重合体とが、9:1~7:3の質量割合で配合されてなる請求項1記載の熱伝導性シート。
- 前記ポリビニルアセタール樹脂が、ポリビニルアセタール又はポリビニルブチラールである請求項1又は2記載の熱伝導性シート。
- 前記ポリビニルアセタール樹脂の分子量が、5×104以上20×104以下である請求項1又は2記載の熱伝導性シート。
- 前記ポリビニルアセタール樹脂の分子量が、5×104以上20×104以下である請求項3記載の熱伝導性シート。
- 前記ポリビニルアセタール樹脂のガラス転移温度が、50℃以上150℃以下である請求項1又は2記載の熱伝導性シート。
- 前記ポリビニルアセタール樹脂のガラス転移温度が、50℃以上150℃以下である請求項3記載の熱伝導性シート。
- 前記ポリビニルアセタール樹脂のガラス転移温度が、50℃以上150℃以下である請求項4記載の熱伝導性シート。
- 前記スチレン-ビニルイソプレンブロック共重合体のスチレン含有量が、10%以上30%以下である請求項1又は2記載の熱伝導性シート。
- 前記スチレン-ビニルイソプレンブロック共重合体のスチレン含有量が、10%以上30%以下である請求項3記載の熱伝導性シート。
- 前記スチレン-ビニルイソプレンブロック共重合体のスチレン含有量が、10%以上30%以下である請求項4記載の熱伝導性シート。
- 前記スチレン-ビニルイソプレンブロック共重合体のスチレン含有量が、10%以上30%以下である請求項6記載の熱伝導性シート。
- 前記スチレン-ビニルイソプレンブロック共重合体のガラス転移温度が、-40℃以上+40℃以下である請求項1又は2記載の熱伝導性シート。
- 前記スチレン-ビニルイソプレンブロック共重合体のガラス転移温度が、-40℃以上+40℃以下である請求項3記載の熱伝導性シート。
- 前記スチレン-ビニルイソプレンブロック共重合体のガラス転移温度が、-40℃以上+40℃以下である請求項4記載の熱伝導性シート。
- 前記スチレン-ビニルイソプレンブロック共重合体のガラス転移温度が、-40℃以上+40℃以下である請求項6記載の熱伝導性シート。
- 前記スチレン-ビニルイソプレンブロック共重合体のガラス転移温度が、-40℃以上+40℃以下である請求項9記載の熱伝導性シート。
- ポリビニルアセタール樹脂と、スチレン-ビニルイソプレンブロック共重合体とを含有する支持シート。
- ポリビニルアセタール樹脂と、スチレン-ビニルイソプレンブロック共重合体とを混合し、シート化して支持樹脂層を形成する工程と、
アクリル系熱伝導組成物を前記支持樹脂層と接触させた状態で硬化させ、熱伝導樹脂層を形成する工程と
を有する熱伝導性シートの製造方法。 - ポリビニルアセタール樹脂と、スチレン-ビニルイソプレンブロック共重合体とを混合し、シート化する支持シートの製造方法。
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- 2015-02-13 WO PCT/JP2015/053958 patent/WO2015151604A1/ja active Application Filing
- 2015-02-13 TW TW104104887A patent/TWI653326B/zh active
- 2015-02-13 CN CN201580017182.6A patent/CN106457801A/zh active Pending
- 2015-02-13 KR KR1020167018340A patent/KR102368118B1/ko active IP Right Grant
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2020
- 2020-11-16 US US17/098,579 patent/US20210060912A1/en active Pending
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US20210060912A1 (en) | 2021-03-04 |
CN106457801A (zh) | 2017-02-22 |
KR20160140577A (ko) | 2016-12-07 |
TW201536908A (zh) | 2015-10-01 |
JP6344951B2 (ja) | 2018-06-20 |
JP2015198144A (ja) | 2015-11-09 |
US10864709B2 (en) | 2020-12-15 |
US20160355000A1 (en) | 2016-12-08 |
KR102368118B1 (ko) | 2022-02-25 |
TWI653326B (zh) | 2019-03-11 |
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