JP2007283509A - Heat-conductive sheet and heat-conductive sheet package - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-conductive sheet excellent in handling properties and fitting properties and heat-conductive package fitted with the heat-conductive sheet. <P>SOLUTION: The heat-conductive package 11 has the heat-conductive sheet 21 (sheet 21) and a package 31 which is formed in the shape of a bag and packs the sheet 21. The sheet 21 has a sheet body 22 which intervenes between a heating element and a radiator to be used and an adhesive layer 23 formed on the outer surface 22a of the sheet body 22. The coefficient of static friction of the sheet body 22 is 1.0 or below. The adhesive layer 23 has adhesive properties higher than those of the sheet body 22 and is formed in part of the outer surface 22a of the sheet body 22. The package 31 has an opening 32 and a notch 33 extending from the opening 32. The adhesive layer 23 is exposed from the notch 33. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a thermally conductive sheet and a thermally conductive sheet package that are used between a heat generator and a heat radiator and promote heat conduction from the heat generator to the heat radiator.

  2. Description of the Related Art In recent years, power consumption and heat generation of electronic elements have increased with the improvement in performance of electronic elements typified by computer CPUs (central processing units). The processing capability of the electronic device is reduced by heat. Therefore, it is necessary to avoid heat storage of the electronic element in order to maintain the performance of the electronic element, and cooling of the electronic element is an important issue. Therefore, the heat conductive sheet used by interposing between the electronic element which is a heating element and a heat sink such as a heat sink is required to have excellent heat conduction performance.

  Patent Document 1 discloses a thermally conductive molded body made of a composition containing thermally conductive fibers having a fiber length of 10 mm or less. Patent Document 2 discloses a heat conductive molded body made of a composition containing a heat resistant polymer matrix and heat conductive fibers. These thermally conductive molded bodies have enhanced thermal conductivity performance by orienting thermally conductive fibers in a certain direction.

  Patent Document 3 discloses a heat conductive sheet including a graphite sheet and an insulating film formed on the graphite sheet. The insulating film insulates the graphite sheet, prevents detachment of the graphite powder from the surface of the sheet, and further improves the mechanical strength of the thermally conductive sheet.

Patent Document 4 discloses a heat conductive sheet made of a polymer member and a heat conductive member and subjected to a non-adhesion treatment. The heat conductive sheet is prevented from adhering to the object even when the object is pressed against the surface by the non-tackifying treatment.
JP-A-4-173235 JP 11-46021 A JP 2001-287299 A JP 2001-316502 A

  However, the thermally conductive molded articles of Patent Documents 1 and 2 have a problem that handling properties (handling properties) during transportation are low because of their high adhesiveness. The adhesiveness of the thermally conductive molded body is higher as the hardness of the thermally conductive molded body is lower. Therefore, as a method for solving the above-mentioned problem, for example, as disclosed in Patent Document 3, a layer having a high hardness such as a graphite sheet is formed on the outer surface of the thermally conductive molded body. A method for reducing the adhesiveness is mentioned. However, in this method, since the heat conductive molded body has a high hardness, there is a problem that the contact heat resistance value of the heat conductive formed body is increased and the heat conductive performance is lowered. Further, when the thermally conductive molded body is sandwiched between the heat generating body and the heat radiating body, a large load is applied to the heat conductive molded body, the heat generating body and the heat radiating body from the outside in order to improve the adhesion between the heat conductive molded body, the heat generating body and the heat radiating body. There is a need. Therefore, there exists a problem that a malfunction may arise in a heat generating body by this big load. Moreover, the handling property of the heat conductive sheet of patent document 4 becomes high when the non-adhesion process is performed to this heat conductive sheet. However, due to this non-tackifying treatment, there is a problem that when the thermally conductive sheet is attached to the heating element, the sheet is likely to be misaligned, and the attachability of the thermally conductive sheet is low.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a heat conductive sheet having excellent handling properties and attachment properties, and a heat conductive package including the heat conductive sheet.

  In order to achieve the above object, the invention according to claim 1 includes a sheet main body used by being interposed between the heating element and the heat radiating body, and an adhesive layer provided on the outer surface of the sheet main body. A heat conductive sheet, wherein the sheet body has a static friction coefficient of 1.0 or less, and the adhesive layer has higher adhesiveness than the sheet body and has a smaller outer shape than the sheet body. Providing sex sheets.

The invention according to claim 2 provides the thermally conductive sheet according to claim 1, wherein the adhesive layer has a thickness of 50 μm or less.
Invention of Claim 3 provides the heat conductive sheet of Claim 1 or Claim 2 with which the said adhesion layer is provided in the peripheral part of the said sheet | seat main body.

  According to a fourth aspect of the present invention, in the outer surface of the sheet main body provided with the adhesive layer, the ratio of the area occupied by the adhesive layer to the entire area of the outer surface is 30% or less. A thermally conductive sheet according to claim 1 is provided.

  The invention according to claim 5 is a heat conduction device comprising: the heat conductive sheet according to any one of claims 1 to 4; and a package that forms a bag and packages the heat conductive sheet. An adhesive layer of a thermally conductive sheet, wherein the package has an opening and a notch communicating with the opening, and the thermally conductive sheet is accommodated in the package. Provides a thermally conductive sheet package that is exposed from the notch.

The invention according to claim 6 provides the thermally conductive sheet package according to claim 5, wherein the package has translucency.
The invention according to claim 7 provides the thermally conductive sheet package according to claim 5 or 6, wherein the static friction coefficient of the sheet body is 0.3 or less.

  Invention of Claim 8 provides the heat conductive sheet packaging body as described in any one of Claim 5 to 7 further equipped with the release sheet which covers the said adhesion layer.

  ADVANTAGE OF THE INVENTION According to this invention, the heat conductive sheet which has the outstanding handling property and attachment property, and a heat conductive package provided with this heat conductive sheet are provided.

Hereinafter, an embodiment in which the present invention is embodied in a thermally conductive sheet package will be described with reference to the drawings.
As shown in FIGS. 1A and 1B, a thermally conductive sheet packaging body 11 according to this embodiment includes a thermally conductive sheet 21 (hereinafter simply referred to as a sheet 21) and a packaging for packaging the sheet 21. And a body 31. The sheet 21 is a pressure sensitive adhesive layered on a sheet body 22 formed from a heat conductive polymer composition (hereinafter simply referred to as a composition) and one outer surface 22a of a pair of opposed outer surfaces 22a of the sheet body 22. Layer 23. The sheet 21 is used by being interposed between the heat generating body and the heat radiating body, and promotes heat conduction from the heat generating body to the heat radiating body.

  The sheet 21 is provided with heat conduction performance, handling properties, and mounting properties. The heat conduction performance is an index representing the ease of heat conduction from the heat generating element to the heat radiating element. Mainly, the heat conductivity of the sheet body 22, the thermal resistance value, and the adhesion between the heat generating element and the heat radiating element. Is attributed. The sheet body 22 has a higher thermal conductivity, a smaller thermal resistance value, and a higher adhesion between the heating element and the heat radiating body. It will be excellent.

  The handleability is an index that represents the ease of handling when the sheet 21 is transported, and is mainly due to the adhesiveness of the sheet body 22. The smaller the adhesiveness of the sheet body 22, the easier the sheet 21 can be handled during transportation and the like, and the better the handleability.

  The attachment property is an index indicating the ease of attachment of the sheet 21 to the heating element or the heat dissipation member, and is caused by the adhesion property of the sheet body 22 and the adhesion property of the adhesion layer 23. The sheet 21 is attached to the heat generating body or the heat radiating body without causing misalignment because the adhesiveness of the sheet main body 22 is low and the adhesive layer 23 has appropriate adhesiveness. .

  The composition contains a polymer matrix and a thermally conductive filler. The polymer matrix holds the thermally conductive filler in the sheet body 22. The polymer matrix is selected according to the performance required for the sheet body 22, for example, mechanical strength such as hardness, durability such as heat resistance, or electrical characteristics. For example, the polymer matrix is thermoplastic or thermosetting. The polymer material is selected. Specific examples of the thermoplastic polymer material include a thermoplastic resin material and a thermoplastic elastomer.

  Specific examples of thermoplastic resin materials include ethylene, α-olefin copolymers such as polyethylene, polypropylene, and ethylene-propylene copolymers, polymethylpentene, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, and ethylene-vinyl acetate. Fluoropolymers such as copolymers, polyvinyl alcohol, polyvinyl acetal, polyvinylidene fluoride and polytetrafluoroethylene, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polystyrene, polyacrylonitrile, styrene-acrylonitrile copolymer, acrylonitrile Butadiene-styrene copolymer (ABS) resin, polyphenylene-ether copolymer (PPE) resin, modified PPE resin, aliphatic polyamide, aromatic polyamide, Polymethacrylates such as imide, polyamideimide, polymethacrylic acid, polymethacrylic acid methyl ester, polyacrylic acids, polycarbonate, polyphenylene sulfide, polysulfone, polyethersulfone, polyethernitrile, polyetherketone, polyketone, liquid crystal polymer , Silicone resins, and ionomers.

  Specific examples of the thermoplastic elastomer include styrene-butadiene block copolymer and hydrogenated polymer thereof, styrene-isoprene block copolymer and hydrogenated polymer thereof, styrene thermoplastic elastomer, olefin thermoplastic elastomer, vinyl chloride Examples thereof include thermoplastic elastomers, polyester-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, and polyamide-based thermoplastic elastomers.

  Specific examples of the thermosetting polymer material include crosslinked rubber, epoxy resin, phenol resin, polyimide resin, unsaturated polyester resin, and diallyl phthalate resin. Specific examples of the crosslinked rubber include natural rubber, acrylic rubber, butadiene rubber, isoprene rubber, styrene-butadiene copolymer rubber, nitrile rubber, hydrogenated nitrile rubber, chloroprene rubber, ethylene-propylene copolymer rubber, chlorinated polyethylene rubber, Examples include chlorosulfonated polyethylene rubber, butyl rubber, halogenated butyl rubber, fluorine rubber, urethane rubber, and silicone rubber.

  The thermally conductive filler increases the thermal conductivity of the sheet 21 by increasing the thermal conductivity of the sheet body 22. Examples of the shape of the thermally conductive filler include fiber, particle, and plate. Preferably, at least a part of the thermally conductive filler is formed into a fiber. Below, the sheet | seat 21 containing the heat conductive filler formed in the fiber form, ie, a fibrous filler, is demonstrated. Specific examples of the fibrous filler include carbon fiber, metal fiber, and glass fiber. These may constitute a fibrous filler alone, or two or more may be combined to constitute a fibrous filler. Among these, since the thermal conductivity of the sheet body 22 is high, carbon fiber is preferable.

  The carbon fiber is produced by infusibilizing a melt-spun fibrous pitch and then carbonizing or graphitizing, or by carbonizing or graphitizing an organic fiber. The fiber length of the carbon fiber is arbitrarily adjusted by pulverizing the carbon fiber during or after the production. The carbon fiber is pulverized using, for example, a hammer mill, a ball mill, a vibrating ball mill, a blade mill, a jet mill, a tornado mill, or a mill mixer. The chopped fiber obtained by being pulverized by a cutting machine during or after the production of the carbon fiber is further pulverized by using each of the above devices, so that the fiber length distribution is narrow and the carbon fiber suitable for the sheet body 22 is suitable. However, carbon fibers that are still chopped fibers may be used.

  The fibrous filler is oriented in a certain direction in the sheet body 22, and heat from the heating element is conducted through the sheet body 22 along the orientation direction of the fibrous filler. Therefore, the average fiber length of the fibrous filler is preferably equal to or greater than the thickness of the sheet body 22 in the orientation direction of the fibrous filler. In this case, the thermal conductivity of the sheet body 22 is easily increased because the fibrous filler is present without any breaks along the direction of thermal conduction. When the average fiber length of the fibrous filler is less than the thickness of the sheet main body 22 in the orientation direction of the fibrous filler, for example, the oriented fibrous fillers overlap, thereby causing the sheet main body 22 in the direction of heat conduction. It is preferable that the heat conductive fibers exist along the line.

  Since the heat conductivity of the sheet body 22 is high, the heat conductive filler having a shape other than the fibrous shape, that is, the non-fibrous filler is made of aluminum oxide, boron nitride, aluminum nitride, silicon carbide, and silicon dioxide. At least one selected is preferable.

  The content of the thermally conductive filler in the composition is preferably 90% by mass or less. When the content of the heat conductive filler exceeds 90% by mass, the flexibility of the sheet body 22 is low, so that the sheet body 22 becomes brittle and follows the surface shape of the heating element and the radiator of the sheet body 22. May decrease. In addition to the above-described components, the composition may contain, for example, a plasticizer for adjusting the hardness of the sheet body 22 and a stabilizer for enhancing durability.

  As shown in FIGS. 2A to 2C, the sheet main body 22 includes a polymer matrix 24 and a heat conductive filler 25. The thermally conductive filler 25 has a fibrous filler 26 and a particulate filler 27. The fibrous filler 26 is oriented in a certain direction in the sheet body 22. For example, in the sheet body 22 shown in FIGS. 2A to 2C, the fibrous filler 26 is oriented along the thickness direction of the sheet body 22. Therefore, in the sheet body 22, the value of the thermal conductivity in the thickness direction is equal to the value obtained by multiplying the value of the thermal conductivity in the width direction by 2 to several hundreds.

  In the sheet body 22, the fibrous filler 26 is exposed on the outer surface 22 a that intersects the orientation direction of the fibrous filler 26. That is, the fibrous filler 26 in the sheet main body 22 shown in FIGS. 2A to 2C extends along the width direction of the sheet main body 22 and is exposed on a pair of opposed outer surfaces 22a. In the fibrous filler 26 exposed on the outer surface 22a of the sheet main body 22, the ratio of the fibrous filler 26 exposed in a state of intersecting the outer surface 22a is preferably 50 to 100%.

  When the proportion of the fibrous filler 26 exposed in a state of crossing the outer surface 22a is less than 50%, that is, the proportion of the fibrous filler 26 exposed in a state of extending parallel to the outer surface 22a is 50%. If the ratio exceeds 1, the orientation of the fibrous filler 26 is insufficient, and the thermal conductivity of the sheet body 22 in the orientation direction of the fibrous filler 26 may be reduced. Therefore, when the ratio of the fibrous filler 26 exposed in a state of crossing the outer surface 22a exceeds 50%, the thermal conductivity of the sheet body 22 in the orientation direction of the fibrous filler 26 is 20 W / m · k or more can be achieved. Further, as the proportion of the fibrous filler 26 exposed in a state of intersecting the outer surface 22a increases, the thermal conductivity of the sheet body 22 in the orientation direction of the fibrous filler 26 is, for example, 50 W / m · k or more can be achieved.

  The ratio of the exposed fibrous filler 26 to the outer surface 22a of the sheet body 22 is, for example, 5 to 10% in terms of the area of the outer surface 22a in the projection view. When the proportion of the exposed fibrous filler 26 is less than 5%, the fibrous filler 26 is insufficiently oriented and the amount of the fibrous filler 26 is small. There is a possibility that the thermal conductivity of the sheet body 22 in the orientation direction of the sheet decreases. If the ratio of the exposed fibrous filler 26 exceeds 10%, the thermal conductivity of the sheet body 22 can be increased, but the flexibility of the sheet body 22 may be reduced.

  The exposed length of the fibrous filler 26, that is, the distance between the outer surface 22a of the sheet body 22 and the exposed tip of the fibrous filler 26 is preferably 50 μm or less. If the exposed length of the fibrous filler 26 exceeds 50 μm, the fibrous filler 26 may fall off from the sheet body 22.

  Since the adhesive strength of the sheet body 22 is very small, the adhesiveness of the sheet body 22 is indicated by the coefficient of static friction of the sheet body 22. That is, when the static friction coefficient of the sheet body 22 is small, the adhesiveness of the sheet body 22 is low, and when the static friction coefficient of the sheet body 22 is large, the adhesiveness of the sheet body 22 is high. The static friction coefficient of the sheet body 22 is 1.0 or less, preferably 0.3 or less. If the coefficient of static friction of the sheet main body 22 exceeds 1.0, the adhesiveness of the sheet main body 22 is excessively high, so that it becomes difficult to handle the sheet 21 and attach it to a heating element, etc. Sex is reduced. When the coefficient of static friction of the sheet body 22 is 0.3 or less, the sheet 21 is easily detached from the package 31 in the thermally conductive sheet package 11. The lower limit of the static friction coefficient of the seat main body 22 is not particularly limited, and the smaller the static friction coefficient of the seat main body 22, the better the handling and mounting properties of the seat 21.

  The thickness of the sheet body 22 is preferably 0.03 to 0.5 mm. When the thickness of the sheet main body 22 is less than 0.03 mm, it is difficult to manufacture the sheet main body 22. When the thickness of the sheet main body 22 exceeds 0.5 mm, it takes time to conduct heat from the heating element to the heat radiating body, and the heat conduction performance of the sheet 21 may be deteriorated. The sheet body 22 having a thickness of 0.5 mm or less easily exhibits flexibility resulting from the material.

  As shown in FIGS. 1A to 2B, the adhesive layer 23 is formed in a square plate shape on a part of the outer surface 22 a of the sheet main body 22. The adhesive layer 23 has higher adhesiveness than the sheet main body 22, and is attached to the heating element to prevent the positional deviation of the sheet 21 when the sheet 21 is attached to the heating element, for example.

  The material of the adhesive layer 23 is not particularly limited as long as the adhesive layer 23 can have higher adhesiveness than the sheet main body 22. Specific examples of the material of the adhesive layer 23 include acrylic and silicone materials. , Urethane-based, vinyl-based, and synthetic rubber-based pressure-sensitive adhesives and adhesives. The adhesive layer 23 is formed by applying a material for forming the adhesive layer 23 to the sheet body 22. Although the adhesive has tackiness immediately after being applied to the sheet main body 22, the adhesive loses tackiness over time. Therefore, since the sheet | seat 21 can be repeatedly used by the adhesion layer 23 maintaining adhesiveness, the material of the adhesion layer 23 has a preferable adhesive. Furthermore, since there exists the same effect, the adhesion layer 23 may be comprised with the adhesive tape by which the said adhesive is apply | coated to the polymer film. In addition, the material of the adhesive layer 23 is preferably flexible because the sheet main body 22 easily adheres to the heat generating body or the heat radiating body.

  In one outer surface 22a to which the adhesive layer 23 of the sheet body 22 is attached, the ratio of the area occupied by the adhesive layer 23 to the entire area of the outer surface 22a is preferably 30% or less. If the proportion of the area occupied by the adhesive layer 23 exceeds 30%, the handling property of the sheet 21 may be deteriorated due to the adhesiveness of the adhesive layer 23. Furthermore, since the adhesive layer 23 does not contain the heat conductive filler 25, the heat conductive performance of the adhesive layer 23 is lower than the heat conductive performance of the sheet body 22. Therefore, when the ratio of the area which the adhesion layer 23 occupies exceeds 30%, there exists a possibility that the heat conductive performance of the sheet | seat 21 may fall excessively.

  The adhesive layer 23 has an outer shape smaller than that of the sheet main body 22, and may be formed at the center of the sheet main body 22 as long as it is a part of the sheet main body 22, but may be formed at the peripheral edge of the sheet main body 22. preferable. Since the amount of heat generated at the center of the heating element is usually higher than the amount of heat generated at the periphery of the heating element, the center of the heating element is hotter than the periphery. When the adhesive layer 23 is formed on the peripheral edge of the sheet main body 22, the contact thermal resistance value of the peripheral edge of the sheet main body 22 attached to the heating element is compared with the contact thermal resistance value of the central portion of the sheet main body 22. Get higher. For this reason, since the central portion of the heating element that has a higher temperature than the peripheral portion corresponds to the central portion of the sheet main body 22 that has a lower contact thermal resistance value than the peripheral portion, the adhesive layer 23 corresponds to the central portion of the sheet main body 22. Compared with the case where is formed, the heat conduction performance of the sheet 21 can be enhanced.

  The adhesive layer 23 of the present embodiment is formed on the peripheral edge of the sheet body 22. Here, the peripheral portion of the sheet main body 22 refers to a region in which the distance from the center of the sheet main body 22 to the peripheral edge is equally divided into five and from the peripheral edge of the sheet main body 22 to 3/5 of the distance. For example, in the sheet main body 22 having a length of 40 mm and a width of 40 mm, the peripheral edge of the sheet main body 22 forms a square ring having a width of 24 mm. Further, in the circular sheet main body 22 having a radius of 20 mm, the peripheral edge portion of the sheet main body 22 forms an annular shape having a width of 12 mm.

  The thickness of the adhesive layer 23 is preferably 50 μm or less. When the thickness of the adhesive layer 23 exceeds 50 μm, the step between the outer surface 22a of the sheet main body 22 and the surface of the adhesive layer 23 becomes large. Therefore, when the sheet 21 is attached to a heating element or a heat radiator, the sheet main body There is a possibility that the adhesion between the heat generating body 22 and the heat radiating body is lowered and the contact thermal resistance value of the sheet 21 is increased. As described above, the heat conduction performance of the adhesive layer 23 is lower than the heat conduction performance of the sheet body 22. Therefore, the lower limit of the thickness of the pressure-sensitive adhesive layer 23 is not particularly limited, and the thinner the pressure-sensitive adhesive layer 23, the higher the adhesion between the sheet body 22 and the heating element or the heat radiating body, and in the direction of heat conduction in the sheet 21. Since the ratio of the adhesion layer 23 becomes low, the sheet | seat 21 has a small contact thermal resistance value.

  As shown in FIGS. 1A and 1B, the package 31 is formed in a flat bag shape having an opening 32, and the heat conductive sheet package 11 is accommodated by accommodating the sheet 21. The sheet 21 is protected during transportation.

  The material of the package 31 is not particularly limited, and specific examples of the material of the package 31 include polyester, polypropylene, polyethylene, polyamide, polyacrylate, and polycarbonate. In order to facilitate attachment of the accommodated sheet 21 to a heating element or a heat dissipation body, the packaging body 31 may have rigidity such that the packaging body 31 itself does not bend when one end of the packaging body 31 is sandwiched, for example. preferable. Furthermore, the packaging body 31 can easily visually recognize the state of the packaged sheet 21 from the outside, and the positioning of the sheet 21 is easy when the sheet 21 is attached to the heating element or the radiator. Therefore, it is preferable to have translucency. Therefore, among the specific examples, polyesters such as polyethylene terephthalate (hereinafter referred to as PET) are preferable.

  A cutout 33 is formed on one side wall of the package 31 and communicates with the opening 32 and extends from the opening 32 toward the center of the package 31. The shape and size of the notch 33 are set such that the adhesive layer 23 is exposed from the packaging body 31 in a state where the sheet 21 is accommodated in the packaging body 31. The notch 33 of the present embodiment is formed in a square shape.

The thermally conductive sheet package 11 is manufactured by storing the sheet 21 in the package 31 after the sheet 21 and the package 31 are formed.
The sheet 21 includes a preparation step for preparing a composition, an orientation step for orienting the fibrous filler in a certain direction, a molding step for shaping the sheet body 22, an exposure step for exposing the fibrous filler 26, and a sheet. It is manufactured through a lamination process in which the adhesive layer 23 is laminated on the main body 22.

  In the preparation step, the components are appropriately mixed to prepare a composition. In the orientation step, for example, after the composition is filled in the mold, the fibrous filler 26 is oriented in a certain direction. Examples of the method for orienting the fibrous filler 26 include a method of applying a magnetic field to the composition using a magnetic field generator and a method of applying vibration to the composition using a vibration device. Since 26 is easily oriented, a method of applying both a magnetic field and vibration to the composition is preferred. At this time, the magnetic field and vibration are applied to the fibrous filler 26 via the composition.

  In the molding step, the polymer matrix 24 is cured or solidified in the mold while maintaining the orientation of the fibrous filler, thereby forming a sheet body 22 having a predetermined shape as shown in FIG. The The fibrous filler 26 in the sheet body 22 after the forming process is not exposed from the outer surface 22a. In the exposing step, when the sheet body 22 has a thermoplastic polymer material as the polymer matrix 24, the polymer matrix 24 is removed from the outer surface 22a of the sheet body 22 using a solvent capable of dissolving the polymer material. Thus, the fibrous filler 26 is exposed on the outer surface 22a. Further, after pressing the mesh blade against the outer surface 22a of the sheet body 22, the polymer matrix 24 is removed from the outer surface 22a by sliding it along the outer surface 22a, and the outer surface 22a is filled with fibers. The material 26 is exposed. In this case, the polymer matrix 24 is removed with a uniform thickness. Further, the polymer matrix 24 is removed from the outer surface 22a by polishing using abrasive paper or the like, and the fibrous filler 26 is exposed on the outer surface 22a.

  In the laminating step, the adhesive layer 23 is laminated on the outer surface 22a of the sheet body 22 by applying a material for forming the adhesive layer 23 to a predetermined portion on the outer surface 22a of the sheet body 22 by a known method.

  When the sheet 21 is attached to the heat generating body and the heat radiating body, as shown in FIG. 4A, for example, the heat conductive sheet packaging body 11 is formed on the heat generating body 13 (for example, an electronic element) disposed on the substrate 12. Is placed. The lower part of the heating element 13 is covered with an insulating layer 14, and a terminal 15 for connecting the heating element 13 to an electric circuit (not shown) on the substrate 12 is disposed between the substrate 12 and the insulating layer 14. ing. When the thermally conductive sheet packaging 11 is placed on the heating element 13, the adhesive layer 23 is opposed to the heating element 13 while positioning the sheet 21. Subsequently, the location corresponding to the adhesion layer 23 in the package 31 is pressed toward the heat generating body 13 with a fingertip, for example. At this time, since the adhesive layer 23 is exposed, it is affixed to the heating element 13 due to its adhesiveness. Subsequently, the packaging body 31 is pulled out toward the opposite side of the heating element 13 where the adhesive layer 23 is pasted. At this time, as shown in FIG. 4B, since the adhesive layer 23 is affixed to the heating element 13, occurrence of displacement of the sheet 21 accompanying the movement of the packaging body 31 is prevented. Further, for example, the sheet main body 22 having a thickness of 0.5 mm or less contacts the heating element 13 due to its flexibility.

  Then, as shown in FIG. 5A, after placing the heat radiating body 16 on the sheet 21, the heat radiating body 16 faces the heat generating body 13 so that the sheet 21 is in close contact with the heat generating body 13 and the heat radiating body 16. The sheet 21 is sandwiched between the heating element 13 and the radiator 16. At this time, as shown in FIG. 5B, the end of the fibrous filler 26 exposed from the outer surface 22a of the sheet main body 22 is press-fitted into the sheet main body 22 by the load. Furthermore, the polymer matrix 24 oozes out between the exposed fibrous fillers 26 due to the load. Therefore, the exposed fibrous filler 26 is immersed relative to the polymer matrix 24 in the sheet body 22. As a result, the adhesiveness of the sheet body 22 is increased, and the sheet body 22 is in close contact with the heating element 13 and the radiator 16 without forming a gap between the heating element 13 and the radiator 16. The value of the load applied to the radiator 16 is, for example, 4.9N.

The effects exhibited by the above embodiment will be described below.
-The heat conductive sheet packaging body 11 of this embodiment is provided with the sheet | seat 21 and the packaging body 31 which packages this sheet | seat 21. FIG. The package 31 has a notch 33, and the adhesive layer 23 of the sheet 21 is exposed from the notch 33. Therefore, the heat conductive sheet packaging body 11 of the present embodiment can protect the sheet 21 by the packaging body 31 at times other than when the sheet 21 is used, such as when the heat conductive sheet packaging body 11 is transported. Further, when the sheet 21 is used, the sheet 21 can be easily prevented from being displaced due to the adhesiveness of the exposed adhesive layer 23, and the packaging body can be attributed to the adhesiveness (static friction coefficient) of the sheet body 22. The sheet 21 can be easily detached from the 31.

  Further, the static friction coefficient of the sheet body 22 and the adhesiveness of the adhesive layer 23 are set as described above, and the adhesive layer 23 is formed only on a part of the sheet body 22. Therefore, the sheet 21 of the present embodiment can exhibit excellent heat conduction performance without being affected by the adhesive layer 23 whose heat conduction performance is lower than that of the sheet main body 22, and the adhesiveness of the sheet main body 22. As a result, excellent handling properties can be exhibited. From the above, the sheet 21 can exhibit excellent heat conduction performance, handling properties, and mounting properties.

  In the thermally conductive sheet package 11, the sheet body 22 is accommodated in the package 31 and the adhesive layer 23 is exposed from the package 31. Therefore, the sheet 21 can be attached to the heating element 13 without directly touching it, and the attachment property of the sheet 21 can be improved, and foreign matters are prevented from adhering to the sheet 21 when being attached to the heating element 13. be able to. Furthermore, even when the sheet main body 22 is thin and the strength of the sheet main body 22 is low, the sheet main body 22 can be prevented from being damaged by gripping the sheet 21 or the like.

  On the other hand, when the adhesive layer 23 is not exposed from the package 31, the entire sheet 21 is packaged so that the adhesive layer 23 is attached to the heater 13 when the sheet 21 is attached to the heater 13. It is necessary to remove from 31 in advance. For this reason, for example, when the sheet 21 is grasped and the sheet 21 is taken out from the package 31, foreign matter adheres to the sheet 21 or the sheet main body 22 having low strength is damaged.

  The adhesive layer 23 of the present embodiment is formed on the peripheral edge of the sheet body 22. Therefore, the size of the notch 33 formed in the packaging body 31 can be reduced as compared with the case where the adhesive layer 23 is formed in the central portion of the sheet body 22, and the rigidity of the packaging body 31 can be easily secured. can do.

In addition, this embodiment can also be changed and embodied as follows.
-As shown in Drawing 6 (a)-(c) and Drawing 7, shape of adhesion layer 23 may be changed into a strip shape, may be changed into an elliptical plate shape, and is changed into a disk shape. May be. Furthermore, a plurality of adhesive layers 23 may be laminated on the outer surface 22a of the sheet body 22. As shown in FIG. 8A, when a plurality of adhesive layers 23 are stacked, a cutout 33 is formed in the package 31 at a location corresponding to each adhesive layer 23. 6A and 6B, when the plurality of adhesive layers 23 are formed along the four corners or side edges of the sheet body 22, the sheet 21 can be stored in the package 31 and Since it is difficult to take out the package 31, the sheet 21 is preferably used alone without forming the heat conductive sheet package 11 together with the package 31.

  As shown in FIG. 7, a cutout 33 may be formed over the entire length of the opening 32 in the package 31. Moreover, as shown in FIG.8 (b), the shape of the notch 33 may be changed into circular arc shape, for example. The outer shape of the notch 33 is preferably similar to the outer shape of the adhesive layer 23.

  -As shown to Fig.9 (a) and (b), the heat conductive sheet packaging body 11 may further be equipped with the release sheet 17. FIG. The release sheet 17 is attached to the package 31 so as to cover the adhesive layer 23. In this case, when the thermally conductive sheet package 11 is transported, the release sheet 17 protects the adhesive layer 23, so that foreign substances adhere to the adhesive layer 23, or the thermally conductive sheet package bodies 11 that are stacked on each other are bonded together. It is possible to prevent the adhesive layer 23 from adhering to another heat conductive sheet packaging body 11. Moreover, the package 31 and the release sheet 17 may be integrated. Specifically, for example, the release sheet 17 is integrated with the package 31 at one end, and the other end of the release sheet 17 is detachably attached to the package 31.

  In the manufacture of the thermally conductive sheet package 11, the sheet body 22 is packaged with the package 31 after the sheet body 22 and the package 31 are formed, and then exposed from the package 31 on the outer surface 22a of the sheet body 22. You may form the adhesion layer 23 in a location.

  -The inner surface of the package 31 may be embossed or wrinkled. In this case, due to the shape of the inner surface of the package 31, it becomes easy to accommodate the sheet 21 in the package 31 and to pull out the package 31.

  -The sheet | seat main body 22 may be comprised with the graphite sheet. Also in this case, the static friction coefficient of the sheet body 22 is 1.0 or less due to the graphite sheet. Furthermore, the adhesive layer 23 has higher adhesiveness than the sheet body 22 made of a graphite sheet.

  -The sheet | seat 21 may be used independently, without comprising the heat conductive sheet packaging body 11 with the packaging body 31. FIG.

Next, the embodiment will be described more specifically with reference to examples and comparative examples.
Example 1-a
In Example 1-a, as an adjustment step, addition type liquid silicone (hereinafter referred to as liquid silicone gel) as the polymer matrix 24, carbon fiber as the fibrous filler 26, and particulate filler 27 are used. The composition was prepared by mixing with spherical alumina. The liquid silicone gel becomes a gel after curing. Table 1 shows the amount of each component. The unit of the amount of each component is part by weight. The viscosity of the liquid silicone gel at 25 ° C. was 400 mPa · s, and the specific gravity of the liquid silicone gel was 1.0. The average fiber diameter of the carbon fibers was 10 μm, and the average fiber length of the carbon fibers was 160 μm. The average particle diameter of the spherical alumina was 3.2 μm. Next, after the composition was stirred until the carbon fibers and the spherical alumina were uniformly dispersed, the composition was defoamed.

  Subsequently, as an alignment step, the viscosity of the composition at 25 ° C. was measured using a rotational viscometer, and then the composition was filled into a mold. The viscosity measurement results are shown in Table 1. Next, a magnetic field having a magnetic flux density of 100,000 gauss is applied to the composition using a superconducting magnet, and vibration having a frequency of 3.0 Hz and an amplitude of 10 mm is applied to the mold using compressed air. The carbon fiber was oriented along the thickness direction of the sheet body 22 by applying to the composition via

  Next, as a forming step, the composition was heated at 120 ° C. for 90 minutes to cure the liquid silicone gel, thereby obtaining a sheet body 22. And as an exposure process, carbon fiber was exposed by removing the hardened silicone from the pair of outer surfaces 22a of the sheet body 22 with a thickness of 5 μm using a rotary cutter. The thickness of the sheet body 22 after the exposure process was 0.3 mm. When the outer surface 22a of the sheet body 22 after the exposure process is observed with an electron microscope, the exposure of the carbon fibers can be confirmed, and the ratio of the exposed carbon fibers in a state of crossing the outer surface 22a. Was 70%. The sheet body 22 thus obtained was cut into a square plate shape (vertical and horizontal length: 40 mm).

  Subsequently, as shown in FIG. 10 (a), as a lamination process, by applying a silicone-based adhesive to the outer surface 22a of the peripheral portion of the sheet body 22, a square-shaped adhesive layer 23 (thickness: 30 μm, vertical And a lateral length: 5 mm) to form a sheet 21.

Example 1-b
As shown in FIG. 10B and Table 2, the sheet 21 was formed in the same manner as in Example 1-a, except that the adhesive layer 23 was formed in a rectangular shape by changing the horizontal length of the adhesive layer 23 to 30 mm. Got.

Example 1-c
As shown in FIG. 10 (c), a sheet was obtained in the same manner as in Example 1-a, except that adhesive layers 23 (thickness: 50 μm, vertical and horizontal lengths: 10 mm) were formed at the four corners of the sheet body 22. 21 was obtained.

Example 1-d
As a lamination process, as shown in FIG. 10 (d), an adhesive tape (thickness: 20 mm, width: 2 mm, length: 20 mm) in which an acrylic silicone adhesive is applied to a PET film is attached to the periphery of the sheet body 22. It stuck on the outer surface 22a of the part. The sheet | seat 21 was obtained like Example 1-a except having added the process and having formed the adhesion layer 23. FIG.

Example 1-e
As shown in FIG. 10 (e), a sheet 21 was obtained in the same manner as in Example 1-a, except that the adhesive layer 23 was formed at the center of the sheet body 22.

Example 1-f
As shown in FIG. 10F and Table 2, a sheet 21 was obtained in the same manner as in Example 1-e, except that the vertical and horizontal lengths of the adhesive layer 23 were changed to 10 mm.

(Example 1-g)
As shown in FIG. 10G and Table 2, a sheet 21 was obtained in the same manner as in Example 1-c, except that the vertical and horizontal lengths of the adhesive layer 23 were changed to 12 mm.

Example 1-h
As shown in Table 2, a sheet 21 was obtained in the same manner as in Example 1-d except that the thickness of the adhesive layer 23 was changed to 70 μm.

(Examples 2-a to 2-h)
In Examples 2-a to 2-h, polyparaphenylene benzobisoxazole precursor carbon fiber (PBO carbon fiber) is used as the fibrous filler 26, and the amount of each component is changed as shown in Table 1. Further, the silicone was removed by polishing using a metal mesh in the exposure step. Other than that obtained the sheet | seat main body 22 like Example 1-a-1-h. When the outer surface 22a of the sheet body 22 after the exposure process is observed with an electron microscope, the exposure of the PBO carbon fiber can be confirmed. In the exposed PBO carbon fiber, the PBO carbon exposed in a state of intersecting the outer surface 22a. The fiber percentage was 70%. The sheet body 22 thus obtained was cut into a square plate shape (vertical and horizontal length: 40 mm). And as shown in Table 3, the adhesion layer 23 was formed like Example 1-a-1-h, and the sheet | seat 21 was obtained.

(Examples 3-a to 3-h)
In Examples 3-a to 3-h, a graphite sheet having a thickness of 0.1 mm and a thermal conductivity in the thickness direction of 15 W / m · K (PGS (registered trademark) manufactured by Panasonic Electronic Devices Co., Ltd.) ) Was used to obtain a sheet main body 22. Then, as shown in Table 4, an adhesive layer 23 was formed in the same manner as in Examples 1-a to 1-h to obtain a sheet 21.

  Here, the alphabets in Examples 2-a to 2-h and Examples 3-a to 3-h indicate correspondence with Examples 1-a to 1-h. For example, in Example 2-a, the adhesive layer 23 is formed in the same manner as in Example 1-a, and in Example 2-b, the adhesive layer 23 is formed in the same manner as in Example 1-b. Similarly, in Example 3-a, the adhesive layer 23 is formed in the same manner as in Example 1-a, and in Example 3-b, the adhesive layer 23 is formed in the same manner as in Example 1-b. .

(Comparative Examples 1-3)
In Comparative Example 1, a sheet was obtained in the same manner as in Example 1-a except that the adhesive layer 23 was omitted. In Comparative Example 2, a sheet was obtained in the same manner as in Example 2-a except that the adhesive layer 23 was omitted. In Comparative Example 3, a sheet was obtained in the same manner as in Example 3-a except that the adhesive layer 23 was omitted.

  And about the sheet main body 22 and the sheet | seat 21 of each example, it measured or evaluated regarding the following each item. The results are shown in Tables 1 to 4. The numerical value in the “cross-direction fibrous filler (%)” column of Table 1 indicates the ratio of carbon fibers or PBO carbon fibers exposed in a state of intersecting the outer surface 22a of the sheet body 22. The numerical values in the column “ratio (%) (outside surface)” in Tables 2 to 4 indicate the ratio of the area occupied by the adhesive layer 23 to the entire area of one outer surface 22a to which the adhesive layer 23 of the sheet body 22 is attached. .

<Handling>
About the sheet | seat main body 22 of each Example, handling property was evaluated based on those adhesiveness. In the “Handling” column of Table 1, “◯” indicates that the adhesiveness of the sheet body 22 is moderately low and the sheet body 22 is easy to handle.

<Thermal conductivity>
After obtaining a disk-shaped test piece (diameter: 10 mm, thickness: 0.3 mm) from the sheet body 22 of each example, the thermal conductivity of the test piece was measured by a laser flash method.

<Thermal resistance value>
As shown in FIG. 11, after the sheet 21 and the metal radiator 16 of each example are sequentially placed on the heating element 13 formed on the substrate 12, a 10 kg weight 41 is placed on the radiator 16. Then, a load of 6.1 × 10 ⁴ Pa was applied to the sheet 21. The heating element 13 is allowed to stand for 10 minutes while heating, the temperature T ₁ of the outer surface of the heat generating element 13 side of the sheet 21 and the temperature T ₂ of the outer surface of the radiator 16 side was measured by measuring instrument. And the thermal resistance value of the sheet | seat 21 was computed by following formula (1). The heating element 13 is usually an electronic component typified by a CPU, but a heater having a heating value of 100 W was used as the heating element 13 in this test in order to simplify and speed up the performance evaluation of the sheet 21. The value of the load indicates the magnitude of the load normally applied to the sheet 21 when the sheet 21 is attached to the electronic component.

Thermal resistance value (° C./W)=(T ₁ (° C.) − T ₂ (° C.)) / Heat generation amount (W) (1)
<Positioning>
In the above <thermal resistance value>, the ease of positioning of the sheet 21 when the sheet 21 was attached to the heating element 13 was evaluated. In the “Positioning” column in Tables 2 to 4, “◯” indicates that the sheet 21 is not displaced even when the heating element 13 to which the sheet 21 is attached is inclined, and “X” indicates When the heating element 13 to which the sheet 21 is attached is tilted obliquely, the sheet 21 is displaced and the position of the sheet 21 is shifted.

表１に示すように、各実施例のシート本体２２においては、各項目について優れた評価および結果が得られた。そのため、各実施例のシート本体２２は、優れた熱伝導性能およびハンドリング性を有する。表２〜４に示すように、各実施例のシート２１においても、各項目について優れた評価および結果が得られた。そのため、各実施例のシート２１は、粘着層２３による熱伝導性能の低下が見られず、且つ位置ずれが起こることなく容易に発熱体１３に取り付けられることができる。以上のことから、各実施例のシート２１は、優れた熱伝導性能、ハンドリング性、及び取り付け性を有している。

As shown in Table 1, in the sheet main body 22 of each example, excellent evaluation and results were obtained for each item. Therefore, the sheet body 22 of each embodiment has excellent heat conduction performance and handling properties. As shown in Tables 2 to 4, excellent evaluation and results were obtained for each item also in the sheet 21 of each example. Therefore, the sheet 21 of each example can be easily attached to the heating element 13 without any deterioration in the heat conduction performance due to the adhesive layer 23 and without causing a positional shift. From the above, the sheet 21 of each example has excellent heat conduction performance, handling properties, and mounting properties.

  In addition, as shown in Tables 1 to 3, the thermal resistance values of the sheets 21 according to Examples 1-c, 2-c, and 3-c are related to Examples 1-f, 2-f, and 3-f. Each was smaller than the thermal resistance value of the sheet 21. In Examples 1-c, 2-c, and 3-c, the adhesive layers 23 are formed at the four corners of the sheet body 22, and in Examples 1-f, 2-f, and 3-f, the adhesive layers 23 are formed on the sheet body 22. It is formed in the central part. Further, the ratio of the area occupied by the adhesive layer 23 to the entire area of one outer surface 22a to which the adhesive layer 23 of the sheet main body 22 is attached is that in Examples 1-c, 2-c and 3-c. Higher than -f, 2-f and 3-f, respectively. From the above, even if the ratio of the area occupied by the adhesive layer 23 to the entire area of the outer surface 22a of the sheet main body 22 is large, the adhesive layer 23 is formed on the peripheral portion of the sheet main body 22, thereby It was found that the heat conduction performance of the sheet 21 can be improved as compared with the case where 23 is formed in the central portion of the sheet main body 22.

On the other hand, in Comparative Examples 1-3, the evaluation regarding positioning was inferior compared with each Example. Therefore, the attachment property of the sheet | seat of each comparative example is inferior compared with each Example.
Example 4
In Example 4, a sheet main body 22 (thickness: 0.3 mm) was obtained in the same manner as Example 1-a.

(Example 5)
In Example 5, a sheet main body 22 (thickness: 0.3 mm) was obtained in the same manner as Example 2-a.

(Example 6)
In Example 6, a sheet main body 22 (thickness: 0.13 mm) was obtained in the same manner as Example 3-a.

(Example 7)
In Example 7, the fibrous filler 26 was omitted, spherical aluminum hydroxide and spherical alumina were used as the particulate filler 27, and the application of the magnetic field and vibration in the alignment step and the exposure step were omitted. In the same manner as in Example 1-a, a sheet main body 22 (thickness: 0.3 mm) was obtained. Table 5 shows the amount of each component.

(Example 8)
In Example 8, a sheet main body 22 was obtained in the same manner as Example 1-a except that the exposure step was omitted.

(Comparative Example 4)
In Comparative Example 4, the fibrous filler 26 was omitted, spherical aluminum hydroxide and spherical alumina were used as the particulate filler 27, and the application of the magnetic field and vibration in the alignment step and the exposure step were omitted. A sheet body (thickness: 0.3 mm) was obtained in the same manner as in Example 1-a. Table 5 shows the types and amounts of each component. As for the sheet | seat main body of the comparative example 4, the one outer surface has adhesiveness, and the other outer surface did not have adhesiveness.

そして、実施例４〜８及び比較例４のシートについて、下記の各項目に関して測定または評価を行った。その結果を表６に示す。表６の“比較例４”欄の“粘着面”は、比較例４のシート本体において粘着性を有している外面についての結果を示し、“非粘着面”は、比較例４のシート本体において粘着性を有していない外面についての結果を示す。

And about the sheet | seat of Examples 4-8 and the comparative example 4, it measured or evaluated regarding the following each item. The results are shown in Table 6. “Adhesive surface” in the “Comparative example 4” column of Table 6 shows the results for the outer surface having adhesiveness in the sheet body of Comparative example 4, and “Non-adhesive surface” is the sheet body of Comparative example 4. The result about the outer surface which does not have adhesiveness in is shown.

<Static friction coefficient>
As shown in FIG. 12, after the sheet main body 22 of each example is placed on the horizontal base 43, a sliding piece 44 and a weight 41 of 120 g (diameter: 28 mm, height: 25 mm cylindrical shape) are placed on the sheet main body 22. ) In order. Next, one end of a pulling tape 45 was attached to the weight 41, and the other end of the tape 45 was fixed to a push-pull gauge 46 (CPU gauge M-9500 manufactured by Aiko Engineering Co., Ltd.). Subsequently, as indicated by an arrow in FIG. 12, the push-pull gauge 46 was pulled at a speed of 100 mm / min in a direction parallel to the outer surface of the sheet main body 22. Next, the static friction force Fs (N) between the seat body 22 and the sliding piece 44 when the push-pull gauge 46 was pulled was measured. And the static friction coefficient was computed by following formula (2). Here, the measurement of the static friction force Fs and the calculation of the static friction coefficient were performed five times for the sheet body 22 of each example, and the average value of the static friction coefficients was taken as the static friction coefficient of the sheet body 22. Further, as the sliding piece 44, two types of PET film (Lumirror S10 75 μm manufactured by Toray Industries, Inc.) and aluminum foil tape (Scotch Brand Tape 433HD manufactured by 3M) were used. For the aluminum foil tape, the aluminum foil tape was placed on the sheet body 22 so that the aluminum foil surface of the tape faces the sheet body 22. Moreover, about the sheet | seat main body of the comparative example 3, it measured and calculated about both the outer surface which has adhesiveness, and the outer surface which does not have adhesiveness.

Coefficient of static friction = Fs (N) / Fp (N) (2)
In the above formula (2), Fp represents the vertical drag generated by the mass (weight) of the sliding piece 44, and the value of Fp is 0.12 kg (weight 41) × 9.8 m / s ² (gravity acceleration) = It is represented by 0.1176N.

<Adhesive strength>
The adhesive strength of the sheet body 22 of each example was measured according to JISZ0237 of Japanese Industrial Standard. Specifically, as shown in FIG. 13, after fixing the film 47 on the surface of the horizontal table 43, the sheet body 22 of each example was placed. Then, one end of the sheet body 22 was attached to a load cell 49 of a tensile tester. And the load at the time of peeling the sheet | seat main body 22 along the perpendicular with respect to the horizontal base 43 at a speed | rate of 300 mm / min was measured. Here, with respect to the sheet main body 22 of each example, the load was measured five times, and the average value of the measured values was used as the adhesive strength of the sheet main body 22. As the film 47, two types of PET film (Lumirror S10 75 μm manufactured by Toray Industries, Inc.) and aluminum foil tape (Scotch Brand Tape 433HD manufactured by 3M) were used. As for the aluminum foil tape, the aluminum foil tape was fixed to the horizontal base 43 so that the aluminum foil surface of the tape faces the sheet main body 22. Moreover, about the sheet | seat main body of the comparative example 4, it measured about both the outer surface which has adhesiveness, and the outer surface which does not have adhesiveness. The column “Adhesive strength (to aluminum) (N / 25 mm)” in Table 6 shows the measurement results of the adhesive strength when using an aluminum foil tape, and the column “Adhesive strength (to PET) (N / 25 mm)” The measurement result of the adhesive force at the time of using a PET film is shown. In these columns, “-” indicates that the adhesive strength was so small that the adhesive strength could not be measured by the above-described method.

表６に示すように、実施例４〜６のシート本体２２は、その静摩擦係数が１．０以下であり、上述の方法で粘着力を測定することができないほど粘着力が小さかった。そのため、実施例４〜６のシート本体２２は取扱いが容易である。実施例７及び８のシート本体２２の静摩擦係数も１．０以下であった。更に、実施例７及び８のシート本体２２は、上述の方法で測定することができる程度の粘着力を有しており、実施例４〜６のシート本体２２に比べて取扱いが若干困難になるものの、十分に実用に耐えるものである。

As shown in Table 6, the sheet main bodies 22 of Examples 4 to 6 had a static friction coefficient of 1.0 or less, and the adhesive strength was so small that the adhesive strength could not be measured by the above-described method. Therefore, the sheet bodies 22 of Examples 4 to 6 are easy to handle. The static friction coefficients of the sheet main bodies 22 of Examples 7 and 8 were also 1.0 or less. Furthermore, the sheet main body 22 of Examples 7 and 8 has an adhesive strength that can be measured by the above-described method, and is slightly difficult to handle as compared with the sheet main bodies 22 of Examples 4 to 6. However, it can withstand practical use.

  On the other hand, the sheet main body of Comparative Example 4 had a static friction coefficient of each outer surface exceeding 1.0, and had higher adhesive strength than each Example. Therefore, handling of the sheet main body of Comparative Example 4 was difficult as compared with each Example.

(A) The top view which shows the heat conductive sheet packaging body which concerns on this embodiment, (b) is sectional drawing in the 1b-1b line | wire of Fig.1 (a). (A) is a top view which shows a sheet | seat, (b) is sectional drawing in the 2b-2b line | wire of Fig.2 (a), (c) is an expanded sectional view which shows a sheet | seat main body. Sectional drawing which shows the sheet | seat main body after a formation process. (A) And (b) is sectional drawing which shows the attachment to the heat generating body of a sheet | seat. (A) is sectional drawing which shows the sheet | seat clamped by the heat generating body and the heat radiator, (b) is an expanded sectional view which shows a sheet | seat main body. (A)-(c) is a top view which shows another example of the adhesion layer. The top view which shows another example of a heat conductive sheet packaging body. (A) And (b) is a top view which shows another example of a heat conductive sheet packaging body. (A) is a top view which shows another example of a heat conductive sheet packaging body, (b) is sectional drawing in the 9b-9b line | wire of Fig.9 (a). (A)-(g) is a top view which shows the sheet | seat which concerns on an Example. Schematic which shows the measuring method of the thermal resistance value of a sheet | seat. Schematic which shows the measuring method of the static friction coefficient of a sheet | seat main body. Schematic which shows the measuring method of the adhesive force of a sheet | seat main body.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Thermally conductive sheet packaging body, 13 ... Heat generating body, 16 ... Radiator, 17 ... Release sheet, 21 ... Thermally conductive sheet, 22 ... Sheet main body, 22a ... Outer surface, 23 ... Adhesive layer, 31 ... Packaging body 32 ... Opening, 33 ... Notch.

Claims (8)

A heat conductive sheet comprising a sheet main body used between a heating element and a heat radiating body, and an adhesive layer provided on the outer surface of the sheet main body,
The static friction coefficient of the sheet body is 1.0 or less,
The adhesive layer has a higher adhesiveness than the sheet main body and has a smaller outer shape than the sheet main body.   The heat conductive sheet according to claim 1, wherein the adhesive layer has a thickness of 50 μm or less.   The heat conductive sheet according to claim 1 or 2 with which said adhesion layer is provided in the peripheral part of said sheet main part.   The heat conductivity according to any one of claims 1 to 3, wherein the ratio of the area occupied by the adhesive layer to the entire outer surface of the outer surface of the sheet main body provided with the adhesive layer is 30% or less. Sheet. A thermally conductive sheet package comprising the thermally conductive sheet according to any one of claims 1 to 4 and a package that forms a bag and wraps the thermally conductive sheet,
The package has an opening and a notch communicating with the opening,
The heat conductive sheet packaging body, wherein the adhesive layer of the heat conductive sheet is exposed from the notch in a state where the heat conductive sheet is accommodated in the packaging body.   The thermally conductive sheet package according to claim 5, wherein the package has translucency.   The thermally conductive sheet package according to claim 5 or 6, wherein the sheet body has a static friction coefficient of 0.3 or less.   The thermally conductive sheet package according to any one of claims 5 to 7, further comprising a release sheet that covers the adhesive layer.

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