JP5375466B2 - Thermally conductive grease composition - Google Patents

Description

  The present invention relates to a thermally conductive grease composition excellent in water dispersibility.

  In general, since electric and electronic parts generate heat during use, it is necessary to remove heat in order to operate the electric parts properly. Therefore, various housings for removing heat such as heat sinks and heat pipes have been proposed. It is necessary to test whether or not the case exhibits the expected heat removal performance in a form close to the actual machine, but in order to perform the test, it is necessary to use a heat dissipation material between the heating element and the case. . This heat conductive material is roughly classified into two types: 1) a sheet-like material that is easy to handle, and 2) a paste-like material generally referred to as a heat radiation grease. Sheets are easy to handle, such as desorption, but their contact thermal resistance increases in nature, so using sheet-like ones makes it difficult to detect individual differences in the performance of the housing. is there.

On the other hand, the heat dissipating grease has a low contact thermal resistance, so that it is easy to find the difference between the individual housings. However, in order to remove the grease after the test, it was necessary to use an organic solvent. Organic solvents are not preferred because they may have an adverse effect on the human body.
In addition, the following literature is mentioned as a prior art relevant to this invention.

Japanese Patent No. 4219793 Japanese Patent No. 4130091 Japanese Patent No. 3948642 JP 2009-96961 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a water-dispersible thermally conductive grease composition.

As a result of intensive investigations to achieve the above object, the present inventors have used a specific polyoxyalkylene-modified silicone oil and / or polyoxyalkylene polymer as a base oil of the heat-dissipating grease, thereby achieving water dispersion. It was found that it could be a possible heat dissipation grease.
That is, since the thermally conductive grease composition comprising the polyoxyalkylene-modified silicone oil and / or polyoxyalkylene polymer and the thermally conductive filler can be dispersed in water, the heat dissipating grease can be removed with water. Therefore, it was found that it was very safe for the human body, and the present invention was made.

（式中、Ｒ ⁹ は炭素数１〜６のアルキル基、Ｒ ¹⁰ は炭素数１〜１８の非置換もしくは置換の飽和又は不飽和１価炭化水素基であり、ｇは５〜１２０の整数である。）
を含有してなることを特徴とする熱伝導性グリース組成物。
〔請求項２〕
成分（Ｂ）の熱伝導性充填剤が、平均粒径０．１〜１００μｍで、１０Ｗ／ｍ℃以上の熱伝導率を有する熱伝導性充填剤であることを特徴とする請求項１記載の熱伝導性グリース組成物。 Accordingly, the present invention provides the following thermally conductive grease composition.
[Claim 1]
Component (A): Table in which the average compositional formula (i), 25 kinematic viscosity ℃ is 10~100,000mm ² / s polyoxyalkylene denatured OIL and / or the following general formula (B) A polyoxyalkylene polymer having a kinematic viscosity at 25 ° C. of 10 to 100,000 mm ² / s ,
G _a R _b SiO _{(4-ab) / 2} (I)
[Wherein G is the following general formula
—R ¹ O (CH ₂ CH ₂ O) _m [CH ₂ CH (CH ₃ ) O] _n R ²
(Where R ¹ is a divalent hydrocarbon group having 1 to 10 carbon atoms, R ² is a hydrogen atom, or a monovalent organic group selected from an alkyl group having 1 to 6 carbon atoms, an acetyl group, and an isocyanate group. , M and n are numbers satisfying 0.1 ≦ m / m + n ≦ 1.0 with 5 ≦ m ≦ 50 and 0 ≦ n ≦ 50.)
, R is the same or different monovalent hydrocarbon group having 1 to 18 carbon atoms, a and b are positive numbers, 1.8 ≦ a + b ≦ 2.2, and 0. It is a number satisfying 01 ≦ a / a + b ≦ 1.0. ]
R ⁴ O (CH ₂ CH ₂ O) _c [CH ₂ CH (CH ₃ ) O] _d R ⁵ (b)
Wherein R ⁴ and R ⁵ are each a hydrogen atom or an unsubstituted or substituted monovalent hydrocarbon group having 1 to 18 carbon atoms, and c and d are 5 ≦ c ≦ 50 and 0 ≦ d ≦ 50. , 0.1 ≦ c / c + d ≦ 1.0.)
Component (B): thermally conductive filler ,
Component (C): alkoxysilane represented by the following general formula (C) and / or one-terminal trifunctional organopolysiloxane represented by the following general formula (D)
R ⁶ _e R ⁷ _f Si (OR ⁸ ) _4-ef (C)
Wherein R ⁶ is an alkyl group having 9 to 15 carbon atoms, R ⁷ is an unsubstituted or substituted saturated or unsaturated monovalent hydrocarbon group having 1 to ⁸ carbon atoms , and R ⁸ is an alkyl group having 1 to 6 carbon atoms. Group, e is an integer of 1 to 3, f is an integer of 0 to 2, and e + f is an integer of 1 to 3.)

Wherein R ⁹ is an alkyl group having 1 to 6 carbon atoms, R ¹⁰ is an unsubstituted or substituted saturated or unsaturated monovalent hydrocarbon group having 1 to 18 carbon atoms, and g is an integer of 5 to 120. is there.)
A thermally conductive grease composition comprising:
[Claim 2 ]
Thermally conductive filler of component (B) is an average particle diameter of 0.1 to 100 [mu] m, according to claim 1 Symbol mounting, characterized in that a thermally conductive filler having a thermal conductivity greater than 10 W / m ° C. Thermally conductive grease composition.

  The thermally conductive grease composition of the present invention is excellent in water dispersibility and does not require the use of an organic solvent for wiping.

  The thermally conductive grease composition of the present invention comprises a component (A): a polyoxyalkylene-modified silicone oil and / or a polyoxyalkylene polymer, and a component (B): a thermally conductive filler. Features.

  The component (A) polyoxyalkylene-modified silicone oil is one of the main components of the thermally conductive grease composition of the present invention and is intended to develop the water dispersibility of the thermally conductive grease composition. The polyoxyalkylene-modified silicone oil represented by the following average composition formula (A) is preferable.

G _a R _b SiO _{(4-ab) / 2} (I)
[Wherein G represents the following general formula: —R ¹ O (CH ₂ CH ₂ O) _m [CH ₂ CH (CH ₃ ) O] _n R ²
(Where R ¹ is a divalent hydrocarbon group having 1 to 10 carbon atoms, R ² is a hydrogen atom, or a monovalent organic group selected from an alkyl group having 1 to 6 carbon atoms, an acetyl group, and an isocyanate group. , M and n are numbers satisfying 0.1 ≦ m / m + n ≦ 1.0 with 5 ≦ m ≦ 50 and 0 ≦ n ≦ 50.)
, R is the same or different monovalent hydrocarbon group having 1 to 18 carbon atoms, a and b are positive numbers, 1.8 ≦ a + b ≦ 2.2, and 0. It is a number satisfying 01 ≦ a / a + b ≦ 1.0. ]

Here, G represents the following general formula: —R ¹ O (CH ₂ CH ₂ O) _m [CH ₂ CH (CH ₃ ) O] _n R ²
R ¹ is a divalent hydrocarbon group having 1 to 10 carbon atoms such as methylene group, ethylene group, propylene group, butylene group, hexamethylene group, octamethylene group, decamethylene group, R ² is a monovalent organic compound selected from a hydrogen atom, an alkyl group having 1 to 6 carbon atoms such as a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, and a hexyl group, an acetyl group, and an isocyanate group. It is a group.

  If m is less than 5, the hydrophobicity is too strong and water dispersibility is poor, and if it is more than 50, the viscosity of the heat dissipating grease becomes too high, so it is in the range of 5-50, preferably in the range of 5-40. When n is larger than 50, the viscosity of the heat dissipating grease becomes too high, and therefore is in the range of 0-50, preferably in the range of 0-40. The relationship between m and n is in the range of 0.1 ≦ m / m + n ≦ 1.0, preferably 0 when m / m + n is less than 0.1, because the hydrophobicity becomes too strong and water dispersion becomes poor. .2 ≦ m / m + n ≦ 1.0.

  R is an alkyl group such as methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, dodecyl, tetradecyl, hexadecyl, octadecyl, etc. An alkenyl group such as a vinyl group or an allyl group; an aryl group such as a phenyl group or a tolyl group; a cycloalkyl group such as a cyclopentyl group or a cyclohexyl group; or a part or all of hydrogen atoms bonded to a carbon atom in these groups The same or different unsubstituted C1-C18 selected from chloromethyl group, 3-chloropropyl group, 3,3,3-trifluoropropyl group, cyanoethyl group, etc., substituted with halogen atom, cyano group, etc. Or it is a substituted monovalent hydrocarbon group.

  Here, a and b are positive numbers and satisfy 1.8 ≦ a + b ≦ 2.2, preferably 1.9 ≦ a + b ≦ 2.1, but the value of a / a + b is 0.8. If it is less than 01, the hydrophobicity is too strong and the heat dissipating grease does not disperse in water, so the range is 0.01 ≦ a / a + b ≦ 1.0, preferably 0.02 ≦ a / a + b ≦ 0.5.

If the kinematic viscosity at 25 ° C. measured with an Ostwald viscometer of this polyoxyalkylene-modified silicone oil is less than 10 mm ² / s, the resulting heat dissipating grease will be separated immediately, or greater than 100,000 mm ² / s. the viscosity of the heat dissipation grease obtained cumbersome too high and is preferably in the range of 10~100,000mm ² / s, in particular in the range of 100~10,000mm ² / s are preferred.

Moreover, a polyoxyalkylene polymer can also be used for a component (A). The polyoxyalkylene polymer is one of the main components of the thermally conductive grease composition of the present invention, and has a (R ³ O) group (where R ³ is an ethylene group or a propylene group) in the molecule. As long as it has any structure, it may be linear or branched, but a linear one represented by the following general formula (b) is preferred.

R ⁴ O (CH ₂ CH ₂ O) _c [CH ₂ CH (CH ₃ ) O] _d R ⁵ (b)
Wherein R ⁴ and R ⁵ are each a hydrogen atom or an unsubstituted or substituted monovalent hydrocarbon group having 1 to 18 carbon atoms, and c and d are 5 ≦ c ≦ 50 and 0 ≦ d ≦ 50. , 0.1 ≦ c / c + d ≦ 1.0.)

In the above formula, R ⁴ and R ⁵ are a hydrogen atom, or a methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, dodecyl group, tetradecyl group. Alkyl groups such as hexadecyl group and octadecyl group; alkenyl groups such as vinyl group and allyl group; aryl groups such as phenyl group and tolyl group; cycloalkyl groups such as cyclopentyl group and cyclohexyl group; The same or selected from a chloromethyl group, a 3-chloropropyl group, a 3,3,3-trifluoropropyl group, a cyanoethyl group, etc., in which some or all of the hydrogen atoms are substituted with a halogen atom, a cyano group, or the like It is a different monovalent hydrocarbon group having 1 to 18 carbon atoms.

  If c is less than 5, the hydrophobicity is too strong and water dispersion is poor, and if it is more than 50, the viscosity of the heat dissipating grease becomes too high, so it is in the range of 5-50, preferably in the range of 5-40. When d is larger than 50, the viscosity of the heat dissipating grease becomes too high, so that it is in the range of 0-50, preferably in the range of 0-40. The relationship between c and d is in a range of 0.1 ≦ c / c + d ≦ 1.0, preferably 0 if c / c + d is smaller than 0.1, because the hydrophobicity becomes too strong and water dispersion becomes poor. .2 ≦ c / c + d ≦ 1.0.

If the kinematic viscosity at 25 ° C. measured with an Ostwald viscometer of this polyoxyalkylene polymer is less than 10 mm ² / s, the resulting heat dissipating grease will be immediately separated and greater than 100,000 mm ² / s. the viscosity of the heat dissipation grease obtained cumbersome too high and is preferably in the range of 10~100,000mm ² / s, in particular in the range of 100~10,000mm ² / s are preferred.

The polyoxyalkylene-modified silicone oil and polyoxyalkylene polymer used as component (A) may be used alone or in combination, and each may be used alone or in combination of two or more. Good. If these components are less than 5% by mass in the thermally conductive grease composition, they are not desirable from the viewpoint of water dispersibility, and if they are more than 80% by mass, the desired thermal conductivity cannot be obtained. The range is preferably 8 to 60% by mass, more preferably 8 to 40% by mass.
In the case where the polyoxyalkylene-modified silicone oil and the polyoxyalkylene polymer are used in combination, the use ratio of the polyoxyalkylene-modified silicone oil / polyoxyalkylene polymer is preferably 1/9 to 9/1 in terms of mass ratio. More preferably, it is 2/8 to 8/2.

  The thermally conductive filler of component (B) is for imparting thermal conductivity to the present invention. If the average particle size of the thermally conductive filler is smaller than 0.1 μm, the viscosity of the resulting composition will be too high and the extensibility will be poor, and if it is larger than 100 μm, the resulting composition will be non-uniform. In the range of 0.1 to 100 μm, preferably in the range of 1 to 20 μm. In the present invention, the average particle diameter can be measured by Microtrac MT3300EX, which is a particle size distribution measuring instrument manufactured by Nikkiso Co., Ltd.

  The filler preferably has a thermal conductivity of 10 W / m ° C. or higher. If the thermal conductivity is too low, the thermal conductivity of the heat radiation grease obtained may be too low.

  This filler may be anything as long as it has a good thermal conductivity, but is aluminum powder, zinc oxide powder, alumina powder, boron nitride powder, aluminum nitride powder, silicon nitride powder, copper powder, silver powder, diamond powder, nickel powder, zinc Although powder, stainless steel powder, carbon powder, etc. are mentioned, it is not restricted to these. These may be either spherical or indeterminate, and two or more of these may be mixed.

  When the blending amount of component (B) is less than 20% by mass in the thermally conductive grease composition, the resulting composition has poor thermal conductivity and poor storage stability, and when it is greater than 95% by mass. Since it becomes a thing with a poor extensibility, the range of 20-95 mass% is preferable, The range of 40-92 mass% is especially preferable, Most preferably, it is the range of 60-92 mass%.

  In the present invention, a wetter component (C) can be further blended as an optional component. This improves the wettability with the component (A) which is the base oil by treating the surface of the heat conductive filler of the component (B) with a wetter component, and assists in high filling.

First, examples of the component (C) include alkoxysilanes represented by the following general formula (C).
R ⁶ _e R ⁷ _f Si (OR ⁸ ) _4-ef (C)

R ⁶ in the above formula is an alkyl group having 9 to 15 carbon atoms, and specific examples include nonyl group, decyl group, dodecyl group, tetradecyl group and the like. If the carbon number is less than 9, the wettability with the powder may not be sufficient, and if it is greater than 15, the alkoxysilane solidifies at room temperature, which is inconvenient to handle and the low temperature characteristics of the resulting composition may be reduced. There is.

R ⁷ in the above formula is an unsubstituted or substituted saturated or unsaturated monovalent hydrocarbon group having 1 to 8 carbon atoms. Specific examples include a methyl group, an ethyl group, a propyl group, a hexyl group, Alkyl groups such as octyl group, cycloalkyl groups such as cyclopentyl group and cyclohexyl group, alkenyl groups such as vinyl group and allyl group, aryl groups such as phenyl group and tolyl group, 2-phenylethyl group, 2-methyl-2- Halogen-substituted hydrocarbon groups such as aralkyl groups such as phenylethyl groups, 3,3,3-trifluoropropyl groups, 2- (perfluorobutyl) ethyl groups, 2- (perfluorooctyl) ethyl groups, and p-chlorophenyl groups Among them, a methyl group and an ethyl group are particularly preferable.

R ⁸ is one or more alkyl groups having 1 to 6 carbon atoms such as a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, and a hexyl group, and a methyl group and an ethyl group are particularly preferable.
E is an integer of 1 to 3, but 1 is particularly preferable. f is an integer of 0 to 2, and e + f is an integer of 1 to 3.

Specific examples of the alkoxysilane represented by the general formula (c) include the following.
C ₁₀ H ₂₁ Si (OCH ₃ ) ₃ , C ₁₂ H ₂₅ Si (OCH ₃ ) ₃ ,
C ₁₀ H ₂₁ Si (CH ₃ ) (OCH ₃ ) ₂ , C ₁₀ H ₂₁ Si (C ₆ H ₅ ) (OCH ₃ ) ₂ ,
C ₁₀ H ₂₁ Si (CH ₃ ) (OC ₂ H ₅ ) ₂ ,
C ₁₀ H ₂₁ Si (CH═CH ₂ ) (OCH ₃ ) ₂ ,
C ₁₀ H ₂₁ Si (CH ₂ CH ₂ CF ₃ ) (OCH ₃ ) ₂

  It is preferable that the addition amount of this alkoxysilane is 0-5 mass% in a heat conductive grease composition. Even if the addition amount is more than 5% by mass, the wetter effect may not increase, which is uneconomical. A more preferable addition amount is 0 to 3% by mass in the heat conductive grease composition. In addition, when mix | blending, 0.5 mass% or more is preferable.

As the component (C), the one-terminal trifunctional hydrolyzable organopolysiloxane represented by the following general formula (d) is listed below.

In said formula, R < ⁹ > is a C1-C6 alkyl group independently, for example, a methyl group, an ethyl group, a propyl group etc. are mentioned, A methyl group and an ethyl group are especially preferable. R ¹⁰ is independently an unsubstituted or substituted saturated or unsaturated monovalent hydrocarbon group having 1 to 18 carbon atoms, for example, methyl group, ethyl group, propyl group, hexyl group, octyl group, decyl group, dodecyl Group, alkyl group such as tetradecyl group, hexadecyl group and octadecyl group, cycloalkyl group such as cyclopentyl group and cyclohexyl group, alkenyl group such as vinyl group and allyl group, aryl group such as phenyl group and tolyl group, 2-phenylethyl Group, aralkyl group such as 2-methyl-2-phenylethyl group, 3,3,3-trifluoropropyl group, 2- (perfluorobutyl) ethyl group, 2- (perfluorooctyl) ethyl group, p-chlorophenyl And a halogenated hydrocarbon group such as a group, and a methyl group is particularly preferable. Moreover, g is an integer of 5-120, Preferably it is an integer of 10-90.

  The addition amount of this one-terminal trifunctional hydrolyzable organopolysiloxane is preferably 0 to 20% by mass in the thermally conductive grease composition. Even if the addition amount is more than 20% by mass, the wetter effect may not increase, which is uneconomical. A more preferable addition amount is 0 to 10% by mass in the heat conductive grease composition. In addition, when mix | blending, it is 0.5 mass% or more.

  Furthermore, in the present invention, a heat resistance improver such as iron oxide and cerium oxide, a viscosity modifier such as silica, a colorant, and the like may be added within a range not impairing the object of the present invention.

  In order to produce the thermally conductive grease composition of the present invention, the components (A) and (B), and optionally the optional component (C) and other components are mixed into a trimix, twin mix, planetary mixer. (All are registered trademarks of mixers manufactured by Inoue Mfg. Co., Ltd.), Ultramixer (registered trademark of mixers manufactured by Mizuho Industry Co., Ltd.), Hibis Dispermix (registered trademark of mixers manufactured by Special Machine Industries Co., Ltd.) It can obtain by mixing with mixers. If necessary, mixing may be performed while heating to 50 to 150 ° C. Further, after mixing, it is preferable to perform a kneading operation under a high shearing force for uniform finishing. Examples of the kneading apparatus include a three roll, a colloid mill, a sand grinder, and the like. Among these, a method using a three roll is preferable.

  EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in full detail, this invention is not limited by this. In order to clarify the superiority of the present invention, specific examples will be shown and proved.

  The test relating to the present invention was performed as follows. The absolute viscosity of the thermally conductive grease composition is measured by a model number PC-1TL (10 rpm) manufactured by Malcolm Co., Ltd., and the thermal conductivity is measured at 25 ° C. by TPA-501 manufactured by Kyoto Electronics Industry Co., Ltd. It was measured. The particle size measurement is a volume-based cumulative average diameter measured by Microtrac MT3300EX, which is a particle size distribution measuring device manufactured by Nikkiso Co., Ltd. The water dispersibility of the thermally conductive grease was evaluated as follows.

<Evaluation of water dispersibility>
A thermal conductive grease was screen-printed on an Al plate with a length of 30 mm × width of 30 mm × thickness of 120 μm. A paper towel was immersed in water, and the printed grease was wiped off. Evaluation was performed as follows.
○: Thermally conductive grease was wiped clean.
Δ: Some heat conductive grease remained on the Al plate.
X: The heat conductive grease was not wiped off at all.

[Examples 1-7 , Reference Example 1 , Comparative Examples 1-3]
As shown in Tables 1 and 2, each component was uniformly mixed at 70 ° C. by a planetary mixer to prepare a heat conductive grease composition. The various tests mentioned above were done using the obtained composition. The results are shown in Tables 1 and 2. In addition, the components (A) to (C) used are as shown below.

(A) -1
G ¹ _0.09 (CH ₃ ) _1.97 SiO _{0.970
^{G 1 = -C 3 H 6 O}} (CH 2 CH 2 O) 26 [CH 2 CH (CH 3) O] 26 C 4 H 9
Kinematic viscosity 1,600mm ² / s

(A) -2
G ² _0.13 (CH ₃ ) _1.93 SiO _{0.970
^{G 2 = -C 3 H 6 O}} (CH 2 CH 2 O) 25.5 [CH 2 CH (CH 3) O] 8.5 C 4 H 9
Kinematic viscosity 1,000mm ² / s

(A) -3
G ³ _0.13 (CH ₃ ) _1.93 SiO _{0.970
^{G 3 = -C 3 H 6 O}} (CH 2 CH 2 O) 8.5 [CH 2 CH (CH 3) O] 25.5 C 4 H 9
Kinematic viscosity 1,100mm ² / s

(A) -4
G ⁴ _0.95 (CH ₃ ) _1.10 SiO _0.975
G ⁴ = −C ₃ H ₆ O (CH ₂ CH ₂ O) ₉ H Kinematic viscosity 300 mm ² / s

(A) -5
C ₄ H ₉ O (CH ₂ CH ₂ O) ₂₀ [CH ₂ CH (CH ₃ ) O] ₂₀ H
Kinematic viscosity 270mm ² / s

(A) -6
CH ₂ = CHCH ₂ O (CH ₂ CH ₂ O) _25.5 [CH ₂ CH (CH ₃ ) O] _8.5 C ₄ H ₉
Kinematic viscosity 150mm ² / s

(A) -7
G ⁵ _0.05 (CH ₃ ) _1.98 SiO _{0.985
^{G 5 = -C 3 H 6 O}} [CH 2 CH (CH 3) O] 27 H kinematic viscosity 600 mm ² / s

(A) -8
(CH ₃ ) _2.01 SiO _0.995 Kinematic viscosity 500 mm ² / s

(A) -9
CH ₂ = CHCH ₂ O [CH ₂ CH (CH ₃ ) O] ₂₇ H Kinematic viscosity 120 mm ² / s

(B) -1
Zinc oxide powder (indefinite shape, average particle size = 2 μm, thermal conductivity = 25.2 W / m ° C.)
(B) -2
Aluminum powder (indefinite shape, average particle size = 7 μm, thermal conductivity = 236 W / m ° C.)

(C) -1
C ₁₀ H ₂₁ Si (OCH ₃ ) ₃
(C) -2

Claims (2)

Component (A): Table in which the average compositional formula (i), 25 kinematic viscosity ℃ is 10~100,000mm ² / s polyoxyalkylene denatured OIL and / or the following general formula (B) A polyoxyalkylene polymer having a kinematic viscosity at 25 ° C. of 10 to 100,000 mm ² / s ,
G _a R _b SiO _{(4-ab) / 2} (I)
[Wherein G is the following general formula
—R ¹ O (CH ₂ CH ₂ O) _m [CH ₂ CH (CH ₃ ) O] _n R ²
(Where R ¹ is a divalent hydrocarbon group having 1 to 10 carbon atoms, R ² is a hydrogen atom, or a monovalent organic group selected from an alkyl group having 1 to 6 carbon atoms, an acetyl group, and an isocyanate group. , M and n are numbers satisfying 0.1 ≦ m / m + n ≦ 1.0 with 5 ≦ m ≦ 50 and 0 ≦ n ≦ 50.)
, R is the same or different monovalent hydrocarbon group having 1 to 18 carbon atoms, a and b are positive numbers, 1.8 ≦ a + b ≦ 2.2, and 0. It is a number satisfying 01 ≦ a / a + b ≦ 1.0. ]
R ⁴ O (CH ₂ CH ₂ O) _c [CH ₂ CH (CH ₃ ) O] _d R ⁵ (b)
Wherein R ⁴ and R ⁵ are each a hydrogen atom or an unsubstituted or substituted monovalent hydrocarbon group having 1 to 18 carbon atoms, and c and d are 5 ≦ c ≦ 50 and 0 ≦ d ≦ 50. , 0.1 ≦ c / c + d ≦ 1.0.)
Component (B): thermally conductive filler ,
Component (C): alkoxysilane represented by the following general formula (C) and / or one-terminal trifunctional organopolysiloxane represented by the following general formula (D)
R ⁶ _e R ⁷ _f Si (OR ⁸ ) _4-ef (C)
Wherein R ⁶ is an alkyl group having 9 to 15 carbon atoms, R ⁷ is an unsubstituted or substituted saturated or unsaturated monovalent hydrocarbon group having 1 to ⁸ carbon atoms , and R ⁸ is an alkyl group having 1 to 6 carbon atoms. Group, e is an integer of 1 to 3, f is an integer of 0 to 2, and e + f is an integer of 1 to 3.)

Wherein R ⁹ is an alkyl group having 1 to 6 carbon atoms, R ¹⁰ is an unsubstituted or substituted saturated or unsaturated monovalent hydrocarbon group having 1 to 18 carbon atoms, and g is an integer of 5 to 120. is there.)
A thermally conductive grease composition comprising: Thermally conductive filler of component (B) is an average particle diameter of 0.1 to 100 [mu] m, according to claim 1 Symbol mounting, characterized in that a thermally conductive filler having a thermal conductivity greater than 10 W / m ° C. Thermally conductive grease composition.