WO2016125737A1 - 熱伝導性ペースト及びその製造方法 - Google Patents
熱伝導性ペースト及びその製造方法 Download PDFInfo
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- WO2016125737A1 WO2016125737A1 PCT/JP2016/052900 JP2016052900W WO2016125737A1 WO 2016125737 A1 WO2016125737 A1 WO 2016125737A1 JP 2016052900 W JP2016052900 W JP 2016052900W WO 2016125737 A1 WO2016125737 A1 WO 2016125737A1
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- WIPO (PCT)
- Prior art keywords
- conductive paste
- fine particles
- silver fine
- primary amine
- mass
- Prior art date
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- 229910000148 ammonium phosphate Inorganic materials 0.000 description 1
- ZRIUUUJAJJNDSS-UHFFFAOYSA-N ammonium phosphates Chemical compound [NH4+].[NH4+].[NH4+].[O-]P([O-])([O-])=O ZRIUUUJAJJNDSS-UHFFFAOYSA-N 0.000 description 1
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- JGQFVRIQXUFPAH-UHFFFAOYSA-N beta-citronellol Natural products OCCC(C)CCCC(C)=C JGQFVRIQXUFPAH-UHFFFAOYSA-N 0.000 description 1
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- SQIFACVGCPWBQZ-UHFFFAOYSA-N delta-terpineol Natural products CC(C)(O)C1CCC(=C)CC1 SQIFACVGCPWBQZ-UHFFFAOYSA-N 0.000 description 1
- OEGDRYRDQUBDHT-UHFFFAOYSA-N diazanium;dodecyl phosphate Chemical compound N.N.CCCCCCCCCCCCOP(O)(O)=O OEGDRYRDQUBDHT-UHFFFAOYSA-N 0.000 description 1
- XXJWXESWEXIICW-UHFFFAOYSA-N diethylene glycol monoethyl ether Chemical compound CCOCCOCCO XXJWXESWEXIICW-UHFFFAOYSA-N 0.000 description 1
- 229940075557 diethylene glycol monoethyl ether Drugs 0.000 description 1
- ZPWVASYFFYYZEW-UHFFFAOYSA-L dipotassium hydrogen phosphate Chemical compound [K+].[K+].OP([O-])([O-])=O ZPWVASYFFYYZEW-UHFFFAOYSA-L 0.000 description 1
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003759 ester based solvent Substances 0.000 description 1
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- 235000019325 ethyl cellulose Nutrition 0.000 description 1
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- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 229940113087 geraniol Drugs 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
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- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000001863 hydroxypropyl cellulose Substances 0.000 description 1
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- 150000002500 ions Chemical class 0.000 description 1
- 229930007744 linalool Natural products 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 150000002762 monocarboxylic acid derivatives Chemical class 0.000 description 1
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 1
- 235000019796 monopotassium phosphate Nutrition 0.000 description 1
- 229910000403 monosodium phosphate Inorganic materials 0.000 description 1
- 235000019799 monosodium phosphate Nutrition 0.000 description 1
- 229920001220 nitrocellulos Polymers 0.000 description 1
- GUSFEBGYPWJUSS-UHFFFAOYSA-N pentaazanium;[oxido(phosphonatooxy)phosphoryl] phosphate Chemical compound [NH4+].[NH4+].[NH4+].[NH4+].[NH4+].[O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O GUSFEBGYPWJUSS-UHFFFAOYSA-N 0.000 description 1
- HWGNBUXHKFFFIH-UHFFFAOYSA-I pentasodium;[oxido(phosphonatooxy)phosphoryl] phosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O HWGNBUXHKFFFIH-UHFFFAOYSA-I 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- PJNZPQUBCPKICU-UHFFFAOYSA-N phosphoric acid;potassium Chemical compound [K].OP(O)(O)=O PJNZPQUBCPKICU-UHFFFAOYSA-N 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 235000014786 phosphorus Nutrition 0.000 description 1
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- OQZCJRJRGMMSGK-UHFFFAOYSA-M potassium metaphosphate Chemical compound [K+].[O-]P(=O)=O OQZCJRJRGMMSGK-UHFFFAOYSA-M 0.000 description 1
- 229940099402 potassium metaphosphate Drugs 0.000 description 1
- 238000000634 powder X-ray diffraction Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002516 radical scavenger Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 150000003335 secondary amines Chemical class 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- CYLMOXYXYHNGHZ-UHFFFAOYSA-M silver;propanoate Chemical compound [Ag+].CCC([O-])=O CYLMOXYXYHNGHZ-UHFFFAOYSA-M 0.000 description 1
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 description 1
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 description 1
- 235000019983 sodium metaphosphate Nutrition 0.000 description 1
- 229940048086 sodium pyrophosphate Drugs 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 235000007586 terpenes Nutrition 0.000 description 1
- 229940116411 terpineol Drugs 0.000 description 1
- RYCLIXPGLDDLTM-UHFFFAOYSA-J tetrapotassium;phosphonato phosphate Chemical compound [K+].[K+].[K+].[K+].[O-]P([O-])(=O)OP([O-])([O-])=O RYCLIXPGLDDLTM-UHFFFAOYSA-J 0.000 description 1
- 235000019818 tetrasodium diphosphate Nutrition 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 239000013008 thixotropic agent Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- UNXRWKVEANCORM-UHFFFAOYSA-N triphosphoric acid Chemical compound OP(O)(=O)OP(O)(=O)OP(O)(O)=O UNXRWKVEANCORM-UHFFFAOYSA-N 0.000 description 1
- 229910000404 tripotassium phosphate Inorganic materials 0.000 description 1
- 235000019798 tripotassium phosphate Nutrition 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
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- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L24/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L24/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
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- B22F1/056—Submicron particles having a size above 100 nm up to 300 nm
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
- B22F9/24—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds starting from liquid metal compounds, e.g. solutions
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J1/00—Adhesives based on inorganic constituents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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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 potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/52—Mounting semiconductor bodies in containers
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- H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L24/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
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- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
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- C—CHEMISTRY; METALLURGY
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- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/314—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive layer and/or the carrier being conductive
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- H01L2224/29339—Silver [Ag] as principal constituent
Definitions
- the present invention relates to a heat conductive paste, and more particularly to a heat conductive paste for die attach or bump formation of a semiconductor device.
- the present invention also relates to a semiconductor device using the thermally conductive paste for joining components.
- a conductive paste containing silver particles is used to form electrodes and circuit patterns of electronic parts.
- Such conductive paste is used, for example, for electrodes such as conductive circuits and capacitors on a printed circuit board.
- a conductive paste in order to improve the storage stability and dispersibility of the metal particles in the organic solvent in the paste together with the conductive metal particles, a conductive paste containing an amine salt of phosphoric acid has been proposed. (Patent Document 1).
- conductive pastes containing metal particles and a surfactant having a phosphate group have been proposed in order to improve the dispersibility of the metal particles (Patent Documents 2 to 6).
- the phosphate group contained in the surfactant adheres to the highly reducible metal particles, and the surfactant having the phosphate group serves as a protective substance to coat the surface of the metal particles, Suppresses aggregation of metal particles in the conductive paste.
- the object of the present invention is to meet the above-mentioned circumstances, using silver fine particles, satisfying the requirements for low-temperature firing at 300 ° C. or lower, more preferably 200 ° C. or lower, having high conductivity, It is to provide a thermally conductive paste with improved conductivity and a method for manufacturing the same.
- the present invention relates to a heat conductive paste containing a group primary amine and a compound having a phosphate group.
- the present invention 2 includes the heat conduction of the present invention 1, comprising 1 to 40 parts by mass of an aliphatic primary amine and 0.001 to 2 parts by mass of a compound having a phosphate group with respect to 100 parts by mass of silver fine particles. Relates to sex paste.
- a silver salt of a carboxylic acid and an aliphatic primary amine are mixed, then a reducing agent is added, and a reaction mixture containing silver fine particles obtained by reaction is mixed with a compound having a phosphate group. It is related with the heat conductive paste obtained.
- the reaction mixture contains 1 to 40 parts by mass of an aliphatic primary amine with respect to 100 parts by mass of the silver fine particles, and 0.001 to 2 parts by mass of a compound having a phosphate group in the reaction mixture. It is related with the heat conductive paste of this invention 3 obtained by doing.
- the compound having a phosphoric acid group is at least one selected from the group consisting of phosphoric acid, pyrophosphoric acid, polyphosphoric acid and their phosphates, and phosphoric acid surfactants.
- the present invention relates to the thermally conductive paste according to any one of 1 to 4.
- the compound having a phosphate group is represented by the formula (I):
- the present invention relates to the thermally conductive paste according to any one of the present inventions 1 to 4, which is a compound represented by the formula (wherein m is 1 to 10).
- the aliphatic primary amine is at least one aliphatic primary amine selected from the group consisting of 2-methoxyethylamine, 3-methoxypropylamine, 3-ethoxypropylamine and 1,2-diaminocyclohexane.
- the present invention relates to the thermally conductive paste according to any one of the present inventions 1 to 6, which is a secondary amine.
- Invention 8 relates to any one of Inventions 1 to 6, wherein the aliphatic primary amine is at least one aliphatic primary amine selected from the group consisting of 3-methoxypropylamine and 1,2-diaminocyclohexane. It relates to the heat conductive paste described in the above.
- the present invention 9 relates to the heat conductive paste according to any one of the present inventions 3 to 8, wherein the reducing agent is at least one reducing agent selected from the group consisting of formic acid, formaldehyde, ascorbic acid and hydrazine.
- the present invention 10 relates to the thermally conductive paste according to any one of the present inventions 3 to 9, wherein the silver salt of carboxylic acid is a silver salt of at least one carboxylic acid selected from the group consisting of acetic acid and propionic acid. .
- the present invention 11 relates to the thermally conductive paste according to any one of the present invention 1 to 10 for die attach of a semiconductor device.
- the present invention 12 relates to the thermally conductive paste according to any one of the present inventions 1 to 10 for bump formation of a semiconductor device.
- the present invention 13 relates to a semiconductor device using the thermally conductive paste according to any one of the present inventions 1 to 12 for joining parts.
- the present invention 14 includes (1) a step of mixing a silver salt of a carboxylic acid and an aliphatic primary amine, (2) a step of adding a reducing agent and reacting at a reaction temperature of 20 to 80 ° C., (3) reaction Manufacturing a thermally conductive paste, comprising separating a product and separating a layer containing silver fine particles; and (4) mixing a compound having a phosphoric acid group into the collected silver fine particle-containing layer.
- the present invention 15 provides a thermally conductive paste comprising 1 to 40 parts by mass of an aliphatic primary amine and 0.001 to 2 parts by mass of a compound having a phosphate group with respect to 100 parts by mass of silver fine particles.
- the present invention relates to a method for producing a thermally conductive paste according to invention 14.
- the heat conductive paste of the present invention can maintain stability and improve applicability to a substrate.
- the heat conductive paste of the present invention ensures sufficient denseness and surface smoothness of the silver film when sintered at a firing temperature of 300 ° C. or less, preferably 200 ° C. or less, for example 120 to 180 ° C., and has a sufficiently high conductivity.
- a silver film exhibiting high thermal conductivity for example, an electrical resistivity (specific resistance) of less than 10 ⁇ ⁇ cm and a thermal conductivity of 65 W / m ⁇ K or more
- the thermal conductive paste of the present invention can sufficiently satisfy the demand for excellent thermal conductivity by improving the sinterability even for silver fine particles having a small average particle diameter.
- the heat conductive paste can be used as a heat conductive paste for die attachment or bump formation.
- a semiconductor device can be obtained by using a heat conductive paste for joining parts.
- the present invention relates to silver fine particles having an average primary particle size of 40 to 350 nm, a crystallite size of 20 to 70 nm, and a ratio of the average particle size to the crystallite size of 1 to 5, It is a heat conductive paste containing a primary amine and a compound having a phosphate group.
- silver fine particles having an average primary particle diameter of 40 to 350 nm, a crystallite diameter of 20 to 70 nm, and a ratio of the average particle diameter to the crystallite diameter of 1 to 5 are specified.
- the average particle size of silver fine particles is measured by FE-SEM (JSM7500F) manufactured by JEOL Ltd., and an arithmetic average value of the diameters of 300 arbitrarily selected particles is obtained. did. Further, in this specification, the crystallite diameter is obtained by measuring the half width of the plane index (1,1,1) plane peak from the measurement by the powder X-ray diffraction method using Cu K ⁇ ray as the source, and the Scherrer equation. This is the result of more calculations.
- the silver fine particles used in the present invention have an average primary particle diameter of 40 to 350 nm, preferably 50 to 200 nm, more preferably 60 to 180 nm.
- the silver fine particles used in the present invention are usually substantially spherical.
- the average particle size of the primary particles is 40 to 350 nm, the aggregation of the silver fine particles is suppressed, storage stability is easily obtained when the paste is made into a paste, and excellent thermal conductivity can be secured.
- a sintered film of silver fine particles having high density and excellent surface smoothness can be obtained, it is also suitable as a raw material for a heat conductive paste.
- the silver fine particles used in the present invention have a crystallite diameter of 20 to 70 nm, preferably 20 to 50 nm.
- Silver fine particles having a crystallite diameter of 20 to 70 nm suppresses volume shrinkage during firing, ensures the denseness and surface smoothness of the silver film formed after firing, and has excellent thermal conductivity. Since it is obtained, it is also suitable as a raw material for a heat conductive paste used for a joining member of an electronic component.
- the silver fine particles used in the present invention have a ratio of average particle diameter of primary particles to crystallite diameter of primary particles (average particle diameter / crystallite diameter) of 1 to 5, preferably 1.5 to 4.5. More preferably, it is in the range of 2-4.
- the silver fine particles have a firing ratio of 300 ° C. or less, preferably 200 ° C. or less, when the ratio of the average particle size of the primary particles to the crystallite size of the primary particles (average particle size / crystallite size) is 1 to 5.
- Thermal conductivity exhibiting sufficient thermal conductivity while ensuring the denseness and smoothness of the obtained thermal conductive film (silver film) at a firing temperature of preferably less than 180 ° C., particularly preferably 120 to 180 ° C. Suitable for paste raw material.
- the silver fine particles used in the present invention can be produced by mixing a silver salt of a carboxylic acid and an aliphatic primary amine, then adding a reducing agent and reacting to precipitate silver fine particles.
- the reaction temperature is preferably 20 to 80 ° C.
- a silver salt of carboxylic acid and an aliphatic primary amine are mixed to obtain a solution in which the silver salt of carboxylic acid is dissolved.
- an aliphatic primary amine is coordinated to a silver salt of carboxylic acid to form a kind of amine complex.
- the silver salt of carboxylic acid is preferably a silver salt of at least one carboxylic acid selected from the group consisting of silver acetate and silver propionate, and more preferably silver acetate. These may be used alone or in combination of two.
- the aliphatic primary amine to be mixed with the silver salt of carboxylic acid may be a chain aliphatic primary amine or a cyclic aliphatic primary amine.
- the aliphatic primary amine may be the same type of aliphatic primary amine or a different type of aliphatic primary amine.
- the aliphatic primary amine may be a monoamine compound or a polyamine compound such as a diamine compound.
- Aliphatic primary amines include those in which an aliphatic hydrocarbon group is substituted with an alkoxy group such as a hydroxyl group, a methoxy group, an ethoxy group, or a propoxy group.
- the aliphatic primary amine is more preferably at least one selected from the group consisting of 2-methoxyethylamine, 3-methoxypropylamine, 3-ethoxypropylamine, 3-aminopropanol, and 1,2-diaminocyclohexane. is there.
- the aliphatic primary amine is more preferably at least one selected from the group consisting of 2-methoxyethylamine, 3-methoxypropylamine, 3-ethoxypropylamine and 1,2-diaminocyclohexane.
- the aliphatic primary amine is more preferably at least one selected from the group consisting of 3-methoxypropylamine and 1,2-diaminocyclohexane.
- the aliphatic primary amine is particularly preferably 3-methoxypropylamine. These may be used alone or in combination of two or more.
- the amount of the aliphatic primary amine to be mixed with the silver salt of the carboxylic acid is determined by process requirements and equipment such as post-treatment of the silver fine particles to be produced, but from the viewpoint of obtaining silver fine particles with a controlled particle size.
- the amino group in the aliphatic primary amine is preferably 1 equivalent or more with respect to 1 equivalent of the carboxylic acid in the silver salt of the carboxylic acid. Further, even if an excess of aliphatic primary amine is present, stable silver fine particles can be produced, but the amount of amine released to the environment increases, so that the amino group in the aliphatic primary amine is increased. Is preferably 3.0 equivalents or less, more preferably 2.0 equivalents or less, and particularly preferably 1.6 equivalents or less.
- excess aliphatic primary amine may be vaporized by heating. It is particularly desirable to employ a preferable range of use amount in which the amino group in the aliphatic primary amine is 1 equivalent or more per 1 equivalent of the carboxylic acid in the silver salt.
- Mixing of the silver salt of carboxylic acid and the aliphatic primary amine can be performed in the absence or presence of an organic solvent. Mixing can be facilitated by the use of organic solvents.
- organic solvents include alcohols such as ethanol, propanol and butanol, ethers such as propylene glycol dibutyl ether, and aromatic hydrocarbons such as toluene. These may be used alone or in combination of two or more.
- the amount of the organic solvent used can be set to an arbitrary amount from the viewpoint of convenience of mixing and productivity of silver fine particles in the subsequent steps.
- the mixing of the silver salt of the carboxylate and the aliphatic primary amine is performed, for example, by stirring the silver salt of the carboxylic acid while stirring the aliphatic primary amine or the mixture of the aliphatic primary amine and the organic solvent. Add and do. Stirring can be continued as appropriate after completion of the addition. Meanwhile, the temperature is preferably maintained at 20 to 80 ° C., more preferably 20 to 60 ° C.
- the reducing agent is preferably at least one reducing agent selected from the group consisting of formic acid, formaldehyde, ascorbic acid and hydrazine, more preferably formic acid, from the viewpoint of control of the reaction. These may be used alone or in combination of two or more.
- the amount of the reducing agent used is usually not less than the redox equivalent relative to the silver salt of the carboxylic acid, and the redox equivalent is preferably 0.5 to 5 times, more preferably 1 to 3 times.
- the amount of formic acid used in terms of mole is 0.25 to 2 with respect to 1 mol of silver salt of carboxylic acid.
- the amount is preferably 0.5 mol, more preferably 0.5 to 1.5 mol, and still more preferably 0.5 to 1.0 mol.
- the temperature is preferably maintained at 20 to 80 ° C.
- the reaction temperature is more preferably 20 to 70 ° C, still more preferably 20 to 60 ° C.
- the time required for the addition of the reducing agent and the subsequent reaction depends on the scale of the reaction apparatus, but is usually 10 minutes to 10 hours.
- an organic solvent such as an alcohol such as ethanol, propanol or butanol, an ether such as propylene glycol dibutyl ether, or an aromatic hydrocarbon such as toluene is added as necessary. Can be added.
- a reaction mixture containing silver fine particles obtained by mixing a silver salt of a carboxylic acid and an aliphatic primary amine and then adding a reducing agent and reacting the mixture contains the fine particles of silver by separating the reaction product into layers. The layer can be recovered.
- the silver fine particles precipitated by the reaction have an average primary particle size of 40 to 350 nm, a crystallite size of 20 to 70 nm, and a ratio of the average primary particle size to the primary crystallite size ( The average particle diameter / crystallite diameter) is 1-5.
- a layer containing silver fine particles deposited by reaction or a reaction mixture containing silver fine particles obtained by mixing a silver salt of a carboxylic acid and an aliphatic primary amine, then adding a reducing agent, and reacting is directly thermally conductive.
- the reaction mixture containing silver fine particles or the layer containing silver fine particles precipitated by the reaction is composed of an unreacted aliphatic primary amine, a carboxylic acid produced by the reaction of a silver salt of a carboxylic acid and a reducing agent, Salts and the like produced by the reaction of the aliphatic primary amine remain.
- the thermal conductive paste is prepared by mixing a silver salt of a carboxylic acid and an aliphatic primary amine, then adding a reducing agent, and precipitating the silver fine particles in the reaction mixture containing the silver fine particles obtained by the reaction, and decanting.
- the silver fine particles can be taken out after removing the supernatant by, for example, and the silver fine particles can be used.
- the precipitation of silver fine particles can be accelerated by adding alcohols such as methanol and ethanol, and if necessary, the remaining methanol can be distilled off by an evaporator to increase the silver content.
- a solvent such as dihydroterpineol or benzyl alcohol can be added to the layer containing silver fine particles immediately before the evaporation with an evaporator.
- the silver content in the layer containing silver fine particles precipitated by the reaction is preferably 30 to 95% by mass, more preferably 50 to 92% by mass.
- Examples of the solvent added to the layer containing silver fine particles precipitated by the reaction include alcohol solvents such as ethylene glycol, propylene glycol, benzyl alcohol, 2-ethyl-1,3-hexanediol, and dihydroterpineol; Terpene alcohols such as terpineol, linalool, geraniol, citronellol; Ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol mono-n-butyl ether, ethylene glycol monophenyl ether, propylene glycol mono-tert-butyl ether, diethylene glycol monoethyl ether, diethylene glyco -Ether alcohol solvents such as dimethyl monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monobutyl ether, tripropylene glyco
- the solvent added to the layer containing silver fine particles may be used alone or in combination of two or more.
- the solvent added to the layer containing silver fine particles is preferably, for example, an alcohol solvent having a hydroxyl group and a boiling point of 180 to 250 ° C. Among them, diethylene glycol monobutyl ether acetate, dihydroterpineol, benzyl alcohol, 2-ethyl 1,3-hexanediol, ethylene glycol monophenyl ether and the like are preferable.
- the content of the solvent added to the layer containing silver fine particles is not particularly limited, but is preferably 1 to 30 parts by mass, more preferably 1 to 100 parts by mass of silver fine particles contained in the layer containing silver fine particles. -20 parts by mass, more preferably 1-10 parts by mass.
- a silver salt of a carboxylic acid and an aliphatic primary amine are mixed, then a reducing agent is added, and the reaction is performed in a reaction mixture containing silver fine particles obtained by reaction or in a layer containing silver fine particles precipitated by the reaction.
- an aliphatic primary amine is coordinated around and forms a kind of amine complex.
- the amines present around the silver fine particles prevent aggregation of silver fine particles having a particle size of sub-micron or less, while the amines considered to be coordinated with the silver fine particles When added, it is considered that the fusion of silver fine particles is hindered, leading to a decrease in thermal conductivity.
- a silver paste of carboxylic acid and an aliphatic primary amine are mixed, then a reducing agent is added, and a reaction mixture containing silver fine particles obtained by reacting or a layer containing silver fine particles precipitated by the reaction as it is is a heat conductive paste.
- a reaction mixture containing silver fine particles obtained by reacting or a layer containing silver fine particles precipitated by the reaction as it is is a heat conductive paste.
- the aliphatic primary amine in the reaction mixture containing silver fine particles or the layer containing silver fine particles precipitated by the reaction is more preferably 1.5 to 35 parts by mass, still more preferably 2 to 100 parts by mass of silver fine particles. To 30 parts by mass, particularly preferably 2 to 20 parts by mass.
- the aliphatic primary amine in the reaction mixture containing silver fine particles or the layer containing silver fine particles precipitated by the reaction is within the above range, the aliphatic primary amine is coordinated around the silver fine particles, Aggregation of silver fine particles can be prevented.
- the aliphatic primary amine in the reaction mixture containing silver fine particles or the layer containing silver fine particles precipitated by the reaction can be obtained by, for example, using a gas chromatograph mass spectrometer (GCMS-QP2010Plus) manufactured by Shimadzu Corporation as shown in the examples described later. Can be measured.
- GCMS-QP2010Plus gas chromatograph mass spectrometer
- the heat conductive paste of the present invention contains silver fine particles having specific particle characteristics, an aliphatic primary amine, and a compound having a phosphate group.
- silver fine particles silver fine particles taken out from the reaction mixture obtained by the above method or a layer containing silver fine particles precipitated by the reaction may be used.
- the aliphatic primary amine contained in the heat conductive paste is a mixture of silver salt of carboxylic acid and aliphatic primary amine, then added with a reducing agent, and reacted to contain the silver fine particles. May be the same type of aliphatic primary amine and different types of aliphatic primary amines.
- the aliphatic primary amine may be a monoamine compound or a polyamine compound such as a diamine compound.
- Aliphatic primary amines include those in which an aliphatic hydrocarbon group is substituted with an alkoxy group such as a hydroxyl group, a methoxy group, an ethoxy group, or a propoxy group.
- the aliphatic primary amine is more preferably at least one selected from the group consisting of 2-methoxyethylamine, 3-methoxypropylamine, 3-ethoxypropylamine, 3-aminopropanol, and 1,2-diaminocyclohexane. is there.
- the aliphatic primary amine is more preferably at least one selected from the group consisting of 2-methoxyethylamine, 3-methoxypropylamine, 3-ethoxypropylamine and 1,2-diaminocyclohexane.
- the aliphatic primary amine is more preferably at least one selected from the group consisting of 3-methoxypropylamine and 1,2-diaminocyclohexane.
- the aliphatic primary amine is particularly preferably 3-methoxypropylamine. These may be used alone or in combination of two or more.
- the heat conductive paste preferably contains 1 to 40 parts by mass of an aliphatic primary amine with respect to 100 parts by mass of the silver fine particles.
- the aliphatic primary amine is more preferably 1.5 to 35 parts by mass, further preferably 2 to 30 parts by mass, particularly preferably 2 to 20 parts by mass with respect to 100 parts by mass of the silver fine particles. Including parts.
- the content of the aliphatic primary amine is 1 to 40 parts by mass with respect to 100 parts by mass of the silver fine particles in the heat conductive paste, the aliphatic primary amine is coordinated around the silver fine particles, Aggregation can be prevented.
- amines considered to be coordinated to the silver fine particles in the heat conductive paste when the heat conductive paste is heat-treated, prevents the fusion of the silver fine particles, leading to a decrease in heat conductivity. it is conceivable that.
- the aliphatic primary amine in the heat conductive paste can be measured, for example, using a gas chromatograph mass spectrometer (GCMS-QP2010Plus) manufactured by Shimadzu Corporation as shown in the examples described later.
- the heat conductive paste of this invention contains the compound which has a phosphoric acid group with the silver fine particle and aliphatic primary amine which have a specific particle characteristic.
- the heat conductive paste of the present invention has a phosphoric acid group in a reaction mixture containing silver fine particles obtained by mixing a silver salt of a carboxylic acid and an aliphatic primary amine and then adding a reducing agent and reacting the mixture. It is obtained by mixing the compounds. While the amines contained in the heat conductive paste prevent aggregation of silver fine particles, they hinder the fusion of silver fine particles during heat treatment.
- the thermally conductive paste of the present invention contains a compound having a phosphate group together with silver fine particles and an aliphatic primary amine, whereby a compound having a phosphate group and amines coordinated to the silver fine particles during firing As a result, the amines can be removed from the periphery of the silver fine particles.
- the heat conductive paste of the present invention includes a specific silver fine particle, an aliphatic primary amine, and a compound having a phosphate group, thereby facilitating the fusion of silver fine particles by low-temperature firing, Denseness and smoothness can be ensured, and thermal conductivity can be further improved.
- the firing temperature is preferably 300 ° C. or less, preferably 200 ° C. or less, more preferably 180 ° C. or less, and particularly preferably 120 to 150 ° C. on the low temperature side.
- the compound having a phosphate group is not particularly limited as long as it has a phosphate group.
- the compound having a phosphoric acid group is selected from the group consisting of phosphoric acid (including hypophosphorous acid, phosphorous acid and phosphonic acid), pyrophosphoric acid, polyphosphoric acid and their phosphates, and phosphoric acid surfactants It is preferable that it is at least one kind.
- Phosphoric acid including hypophosphorous acid, phosphorous acid, phosphonic acid
- pyrophosphoric acid and their phosphate salts include phosphoric acid, phosphonic acid, sodium dihydrogen phosphate, disodium hydrogen phosphate, triphosphate Sodium, sodium pyrophosphate, sodium metaphosphate, potassium dihydrogen phosphate, dipotassium hydrogen phosphate, tripotassium phosphate, potassium pyrophosphate, potassium metaphosphate, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, triphosphate Ammonium, ammonium pyrophosphate and the like can be used.
- linear condensed phosphoric acid such as tripolyphosphoric acid and tetrapolyphosphoric acid
- cyclic condensed phosphoric acid such as metaphosphoric acid and hexametaphosphoric acid
- chain and cyclic condensed phosphoric acid are combined.
- Condensed phosphoric acids ammonium salt, sodium salt, potassium salt, etc. can be used.
- the phosphate surfactant is not particularly limited as long as it is a surfactant having a phosphate group.
- examples of the surfactant having a phosphoric acid group include polyoxyethylene alkylphenyl ether phosphoric acid, polyoxyethylene alkyl ether phosphoric acid, dipolyoxyethylene lauryl ether ammonium phosphate, dipolyoxyethylene oxypropylene lauryl ether phosphoric acid.
- Surfactants having a phosphate group include Phosphanol (registered trademark) PE-510, PE-610, LB-400, EC-6103, RE-410, RS-410, RS-610, RS-710, and the like. (All manufactured by Toho Chemical Co., Ltd.), Disperbyk (registered trademark) -102, Disperbyk-106, Disperbyk-110, Disperbyk-111, Disperbyk-180, etc. (all manufactured by Big Chemie Japan) Can be used.
- the surfactant having a phosphate group is preferably a surfactant having an acid value in the range of 50 to 140 mgKOH / g and an amine value in the range of about 0 to 100 mgKOH / g.
- Examples of the compound having a phosphate group include formula (I): A compound represented by the formula (wherein m is 1 to 10) can be used.
- the compound represented by the formula (I) may be in the form of a mixture containing an amine together with the compound represented by the formula (I). At that time, the amine content is within a range that does not impair the effects of the present invention.
- Examples of the compound having a phosphate group used in the heat conductive paste of the present invention include phosphoric acid, phosphonic acid, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, triammonium phosphate, ammonium pyrophosphate, and phosphate groups. It is preferable to use at least one selected from the group consisting of a surfactant and a compound represented by formula (I).
- the surfactant having a phosphoric acid group preferably has an acid value in the range of 90 to 140 mgKOH / g.
- the heat conductive paste of the present invention is composed of 100 parts by mass of silver fine particles having specific particle characteristics, 1 to 40 parts by mass of an aliphatic primary amine, and 0.001 to 2 parts by mass of a compound having a phosphate group. It is preferable to include a part.
- the heat conductive paste of the present invention has a phosphoric acid group in a reaction mixture containing silver fine particles obtained by mixing a silver salt of a carboxylic acid and an aliphatic primary amine and then adding a reducing agent and reacting the mixture.
- a compound obtained by mixing a compound, wherein the reaction mixture contains 1 to 40 parts by mass of an aliphatic primary amine with respect to 100 parts by mass of silver fine particles, and the compound having a phosphate group in the reaction mixture Is preferably obtained by mixing 0.001 to 2 parts by mass.
- the compound having a phosphate group contained in the heat conductive paste is preferably 1001 to 1.5 parts by mass with respect to 100 parts by mass of silver fine particles and 1 to 40 parts by mass of aliphatic primary amine. Part, more preferably 0.001 to 1.0 part by weight.
- the heat conductive paste of the present invention contains 0.001 to 2 parts by mass of a compound having a phosphoric acid group with respect to 100 parts by mass of silver fine particles and 1 to 40 parts by mass of an aliphatic primary amine.
- the amines coordinated to the silver fine particles that hindered the fusion of the silver fine particles were removed from the periphery of the silver fine particles, and the fusion of the silver fine particles was promoted by firing at a low temperature range, and the denseness of the silver film And smoothness can be ensured and thermal conductivity can be improved more.
- the content of the compound having a phosphate group in the thermally conductive paste is less than 0.001 part by mass, the content of the compound having a phosphate group is too small, and the amine is coordinated to the silver fine particles. May not be sufficiently removed from the periphery of the silver fine particles, and thermal conductivity or specific resistance may be reduced.
- the content of the compound having a phosphate group in the heat conductive paste exceeds 2 parts by mass, a compound having a phosphate group on the surface of the silver fine particles excluding amines coordinated on the surface is obtained. In some cases, it adheres and, on the contrary, prevents fusion between the silver fine particles.
- the heat conductive paste of the present invention includes silver fine particles having specific particle characteristics, an aliphatic primary amine, and a compound having a phosphate group, and may further include a binder resin.
- the heat conductive paste of the present invention has a phosphoric acid group in a reaction mixture containing silver fine particles obtained by mixing a silver salt of a carboxylic acid and an aliphatic primary amine and then adding a reducing agent and reacting the mixture. It is obtained by mixing the compounds and can further contain a binder resin.
- the content of the binder resin in the heat conductive paste is preferably 1 to 15 parts by mass, more preferably 2 to 12 parts by mass, and further preferably 3 to 10 parts by mass with respect to 100 parts by mass of the silver fine particles.
- the binder resin used in the present invention may be a thermosetting resin or a thermoplastic resin.
- the thermosetting resin is not particularly limited as long as it is cured by heating.
- epoxy resin, urethane resin, vinyl ester resin, silicone resin, phenol resin, urea resin, melamine resin, unsaturated polyester resin. , Diallyl phthalate resin, polyimide resin, and the like can be used.
- the thermoplastic resin is not particularly limited as long as it is softened by heating, and those known in the art can be used.
- cellulose resins such as ethyl cellulose and nitrocellulose, acrylic resins, alkyd resins, saturated polyester resins, butyral resins, polyvinyl alcohol, hydroxypropyl cellulose, and the like can be used. These binder resins may be used alone or in combination of two or more.
- the thermally conductive paste may further include a curing agent.
- the curing agent is not particularly limited as long as it cures the thermosetting resin, and for example, a cationic polymerization initiator, an amine curing agent, an acid anhydride curing agent, a phenol curing agent, and the like can be used.
- a cationic polymerization initiator is particularly preferred from the viewpoint that fusion between silver particles proceeds and good conductivity is obtained. These may be used alone or in combination of two or more.
- the content of the curing agent in the thermally conductive paste is not particularly limited because it varies greatly depending on the type of the curing agent and the combination with the binder resin.
- the epoxy resin in which the binder resin in the thermally conductive paste contains an ester bond is not limited.
- the curing agent is a cationic polymerization initiator in the resin, the amount is preferably 0.5 to 10 parts by mass, more preferably 2.5 to 8 parts by mass with respect to 100 parts by mass of the binder resin.
- the heat conductive paste of the present invention includes a titanium coupling agent (for example, titanate such as isopropyl triisostearoyl titanate), a silane coupling agent, a flame retardant, a leveling agent, a thixotropic agent, and an antifoaming agent.
- a titanium coupling agent for example, titanate such as isopropyl triisostearoyl titanate
- silane coupling agent for example, a silane coupling agent, a flame retardant, a leveling agent, a thixotropic agent, and an antifoaming agent.
- An ion scavenger and the like can be contained.
- the method for producing a heat conductive paste of the present invention comprises (1) a step of mixing a silver salt of a carboxylic acid and an aliphatic primary amine, and (2) a reaction at a reaction temperature of 20 to 80 ° C. by adding a reducing agent. (3) a step of separating the reaction product into layers and recovering a layer containing silver fine particles, and (4) a step of mixing a compound having a phosphate group with the layer containing the recovered silver fine particles. .
- an organic solvent may be present in the steps (1) to (4).
- the organic solvent used here is an alcohol such as ethanol, propanol, or butanol, an ether such as propylene glycol dibutyl ether, an aromatic hydrocarbon such as toluene, etc.
- An organic solvent is an alcohol such as ethanol, propanol, or butanol, an ether such as propylene glycol dibutyl ether, an aromatic hydrocarbon such as toluene, etc.
- the layer containing silver fine particles obtained by separating the reaction product into layers is an unreacted aliphatic primary amine, a carboxylic acid produced by the reaction of a silver salt of a carboxylic acid and a reducing agent, A salt or the like produced by the reaction of the carboxylic acid and the aliphatic primary amine remains.
- the aliphatic primary amine is preferably 1 to 40 parts by mass, more preferably 1.5 to 35 parts by mass, and still more preferably 100 parts by mass of the silver fine particles. 2 to 30 parts by mass, particularly preferably 2 to 20 parts by mass is contained.
- the aliphatic primary amine in the layer containing silver fine particles can be measured, for example, using a gas chromatograph mass spectrometer (GCMS-QP2010Plus) manufactured by Shimadzu Corporation as shown in the examples described later.
- GCMS-QP2010Plus gas chromatograph mass spectrometer
- 0.001 to 2 parts by mass of a compound having a phosphate group is mixed with 100 parts by mass of the silver fine particles contained in the layer containing the collected silver fine particles. It is preferable to obtain a heat conductive paste containing 1 to 40 parts by mass of an aliphatic primary amine and 0.001 to 2 parts by mass of a compound having a phosphate group with respect to parts by mass.
- the compound having a phosphoric acid group is more preferably 0.001 to 1.5 parts by mass, and still more preferably 0.001 to 1.0 parts by mass with respect to 100 parts by mass of the silver fine particles.
- the heat conductive paste obtained by the steps (1) to (4) contains 0.001 to 2 parts by mass of a compound having a phosphoric acid group, thereby preventing silver fine particles from being fused with each other during firing.
- the amines coordinated to the fine particles are removed from the surroundings of the silver fine particles, and the fusion of the silver fine particles is promoted by firing at a low temperature range, ensuring the denseness and smoothness of the silver film, and further improving the thermal conductivity. can do.
- the method for producing a heat conductive paste of the present invention is the same as the step of mixing a compound having a phosphoric acid group when the heat conductive paste to be obtained contains a binder resin and other additives such as a curing agent, Alternatively, it may include a step of mixing a binder resin, a curing catalyst or the like before or after that.
- the heat conductivity A film (silver film) can be formed.
- the firing temperature is preferably 60 to 300 ° C., more preferably 100 to 250 ° C., still more preferably 120 to 200 ° C., and particularly preferably 120 to 180 ° C.
- the blended silver fine particles have an average primary particle diameter of 40 to 350 nm, a crystallite diameter of 20 to 70 nm, and a ratio of the average particle diameter to the crystallite diameter of 1 to 5.
- the heat conductive paste of the present invention is particularly suitable for application as a die attach material for semiconductor devices.
- a die attach material lead solder is widely used, but due to the toxicity of lead, restrictions on the use of lead in each country are becoming stricter.
- the die attach material obtained by using the heat conductive paste of the present invention exhibits a heat conductivity equal to or higher than that of lead solder (generally 35 to 65 W / mK) and also has good conductivity. Therefore, it can be a high conductivity and high thermal conductivity die attach material that can replace lead solder.
- the thermal conductive paste of the present invention is also suitable for application as a bump in a semiconductor device.
- the heat conductive paste of this invention is suitable as a joining member in electronic components, such as a bump and a die attach material.
- a semiconductor device using the thermally conductive paste of the present invention for joining parts has excellent thermal conductivity.
- the content of the aliphatic primary amine in the paste containing silver fine particles was determined by gasifying the analysis sample at 250 ° C. in a pyrolyzer (PY-3030D), and using a gas chromatograph mass spectrometer (GCMS- QP2010Plus) can be injected and measured by the split method. Details of the measurement conditions are as follows. Starting temperature: 40 ° C Holding time at start temperature: 3 minutes Temperature increase rate: 15 ° C / min End temperature: 300 ° C Retention time at end temperature: 10 minutes Column type: ULTRA ALLOY-5 (manufactured by Frontier Labs) Carrier gas: Helium gas Carrier gas flow rate (column flow rate): 1.78 ml / min
- the upper layer was a clear yellow liquid, and black silver fine particles (A2) were precipitated in the lower layer.
- the liquid in the upper layer was removed by decantation, and methanol was added and allowed to stand, and decantation was repeated to collect a layer containing silver fine particles.
- 0.15 kg of dihydroterpineol was added to the layer containing silver fine particles and mixed, and the remaining methanol was distilled off by an evaporator to obtain a paste containing 90% by mass of silver containing silver fine particles.
- the 1,2-diaminocyclohexane in the obtained paste was 2 parts by mass with respect to 100 parts by mass of the silver fine particles in the paste.
- [Paste containing silver fine particles (A3)] Contains silver fine particles (A3) in the same manner as the paste preparation containing silver fine particles (A1) except that 2-methoxyethylamine is used as the aliphatic primary amine instead of 3-methoxypropylamine.
- a paste was prepared. The silver content in the paste was 90% by mass. The amount of 2-methoxyethylamine in the obtained paste was 2 parts by mass with respect to 100 parts by mass of the silver fine particles in the paste.
- [Paste containing silver fine particles (A4)] Contains silver fine particles (A4) in the same manner as the paste preparation containing silver fine particles (A1) except that 3-ethoxypropylamine is used instead of 3-methoxypropylamine as the aliphatic primary amine.
- a paste was prepared. The silver content in the paste was 90% by mass. The amount of 3-ethoxypropylamine in the obtained paste was 2 parts by mass with respect to 100 parts by mass of the silver fine particles in the paste.
- a paste containing silver fine particles (A5) was produced in the same manner as the above method for producing a paste containing silver fine particles (A1) except that diethylene glycol monophenyl ether was used instead of dihydroterpineol as a solvent.
- the silver content in the paste was 90% by mass.
- the amount of 3-methoxypropylamine in the obtained paste was 2 parts by mass with respect to 100 parts by mass of the silver fine particles in the paste.
- a paste containing silver fine particles (A5) was produced in the same manner as the above method for producing a paste containing silver fine particles (A1) except that ethylene glycol monophenyl ether was used instead of dihydroterpineol as a solvent.
- the silver content in the paste was 90% by mass.
- the amount of 3-methoxypropylamine in the obtained paste was 2 parts by mass with respect to 100 parts by mass of the silver fine particles in the paste.
- the measurement and evaluation of the particle characteristics of the silver fine particles were performed as follows.
- Average particle diameter of primary particles Measured by FE-SEM (JSM7500F) manufactured by JEOL Ltd., the arithmetic average value of the diameter of 300 arbitrarily selected particles was determined, and the value was used as the average particle diameter.
- Crystallite diameter The half-value width of the plane index (1,1,1) plane peak using Cu K ⁇ ray as the radiation source was determined by measurement with an X-ray diffraction measurement device (M18XHF22) manufactured by Mac Science, and the Scherrer equation was used. The crystallite size was calculated.
- Examples 1 to 6, 12 A paste (silver content 90 mass%) containing silver fine particles (A1) obtained by the steps (1) to (3) is added to (4) a compound having a phosphate group as ammonium hydrogen phosphate, phosphoric acid, phosphorus An acid surfactant (Disperbyk 180 or Disperbyk 111) was added in each formulation shown in Table 2 to obtain heat conductive pastes of Examples 1 to 6 and 12.
- the unit of each formulation is “parts by mass”.
- Disperbyk 111 as a phosphoric acid-based surfactant has a formula (I): (Wherein, m is 1 to 10).
- Disperbyk180 as a phosphate surfactant was a mixture of the compound represented by formula (I) and an amine.
- Example 7 to 11 As described above, the paste containing silver fine particles (A2) (silver content 90% by mass) and the paste containing silver fine particles (A3) (silver content 90% by mass) obtained by the steps (1) to (3) , Paste containing silver fine particles (A4) (silver content 90% by mass), paste containing silver fine particles (A5) (silver content 90% by mass), or paste containing silver fine particles (A6) (silver content 90% by mass) %) was added (4) ammonium hydrogen phosphate as a compound having a phosphate group in each formulation shown in Table 2 to obtain thermal conductive pastes of Examples 7 to 11. In Table 2, the unit of each formulation is “parts by mass”.
- Comparative Examples 1 to 4 In Comparative Example 1, a paste (silver content 90 mass%) containing silver fine particles (A1) was used as a heat conductive paste. Comparative Examples 2, 3, and 4 have “acetic acid” and “amino group” in the paste containing silver fine particles (A1) (silver content 90 mass%) instead of the compound having a phosphate group, respectively. , “A surfactant not having a phosphate group” or “compound having a phosphorus element and having no phosphoric acid” was added in each formulation shown in Table 2. Table 2 shows the compositions of the heat conductive pastes of Comparative Examples 1 to 4.
- the thermal conductive paste is applied on a slide glass so that the width is 0.5 cm, the length is 5.0 cm, and the thickness is 100 ⁇ m, and the temperature is raised from room temperature (25 ° C.) to 3 ° C./min by a blow dryer. Heating was started at a rate, and when the temperature reached 120 ° C., heating was further performed for 1 hour while maintaining the temperature to form a silver film on the slide glass.
- the film thickness of the obtained silver film was measured with a surface roughness / shape measuring instrument (Surfcom 300B) manufactured by Tokyo Seimitsu Co., Ltd., and then using a multimeter (2001 type (memory 128K)) manufactured by Toyo Corporation. Electrical resistance was measured by the terminal method. The electrical resistivity (specific resistance) was determined from the obtained film thickness after heat curing and electrical resistance. The electrical resistivity (specific resistance) was evaluated as ⁇ when it was less than 10 ⁇ ⁇ cm, and ⁇ when it was 10 ⁇ ⁇ cm or more.
- ⁇ Thermal conductivity ⁇ Apply the heat conductive paste onto the slide glass so that the coating thickness is 1 to 2 mm, and heat the paste at the temperature rise rate from room temperature (25 ° C) to 3 ° C / min. When the temperature reached 120 ° C., heating was further performed for 1 hour while maintaining the temperature. After the heating, the film was sufficiently cooled to room temperature (25 ° C.), and the silver film formed on the slide glass was peeled off from the slide glass. The thermal conductivity of the silver film thus obtained was measured using a laser flash method (Xe flash analyzer manufactured by NETZSCH) to obtain a thermal conductivity value. Generally, the thermal conductivity of lead solder is 35 to 65 W / m ⁇ K. The thermal conductivity was evaluated as ⁇ for 65 W / m ⁇ K or more and x for less than 65 W / m ⁇ K.
- Table 2 shows the evaluation of electrical resistivity (specific resistance) and the evaluation of thermal conductivity for the thermal conductive pastes of the examples and comparative examples.
- the heat conductive pastes of Examples 1 to 12 contain silver fine particles having specific particle characteristics, an aliphatic primary amine, and a compound having a phosphate group.
- the heat conductive paste of the present invention comprises an amine coordinated to silver fine particles during firing by containing silver fine particles having specific particle characteristics, an aliphatic primary amine, and a compound having a phosphate group. Was removed from the surroundings of the silver fine particles, and sintering at a relatively low temperature of 120 ° C. promoted the sintering of the silver fine particles, thereby improving the thermal conductivity.
- the heat conductive pastes of Comparative Examples 1 to 4 are silver having an electrical resistivity (specific resistance) of 50 ⁇ ⁇ cm or more and a thermal conductivity of 15 W / m ⁇ K or less at a relatively low firing temperature of 120 ° C. A film was formed and no improvement in conductivity and thermal conductivity was observed.
- the denseness and surface smoothness of the silver film are ensured during sintering at a low firing temperature of 300 ° C. or less, preferably 200 ° C. or less, for example, 120 to 180 ° C.
- Thermally conductive film exhibiting sufficient thermal conductivity and electrical conductivity (for example, thermal conductivity of 80 W / m ⁇ K or more and electrical resistivity (specific resistance) of 9.5 ⁇ ⁇ cm or less by firing at 120 ° C.) (Silver film) can be formed.
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Abstract
Description
本発明2は、銀微粒子を100質量部に対して、脂肪族第一級アミンを1~40質量部、リン酸基を有する化合物を0.001~2質量部含む、本発明1の熱伝導性ペーストに関する。
本発明4は、反応混合物が、銀微粒子100質量部に対して、脂肪族第一級アミンを1~40質量部含み、反応混合物にリン酸基を有する化合物を0.001~2質量部混合して得られる、本発明3の熱伝導性ペーストに関する。
本発明6は、リン酸基を有する化合物が、式(I):
(式中、mは1~10である。)で表される化合物である、本発明1~4のいずれかに記載の熱伝導性ペーストに関する。
本発明7は、脂肪族第一級アミンが、2-メトキシエチルアミン、3-メトキシプロピルアミン、3-エトキシプロピルアミン及び1,2-ジアミノシクロヘキサンからなる群から選ばれる少なくとも1種の脂肪族第一級アミンである本発明1~6のいずれかに記載の熱伝導性ペーストに関する。
本発明8は、脂肪族第一級アミンが、3-メトキシプロピルアミン及び1,2-ジアミノシクロヘキサンからなる群より選ばれる少なくとも1種の脂肪族第一級アミンである本発明1~6のいずれかに記載の熱伝導性ペーストに関する。
本発明9は、還元剤が、ギ酸、ホルムアルデヒド、アスコルビン酸及びヒドラジンからなる群より選ばれる少なくとも1種の還元剤である、本発明3~8のいずれかに記載の熱伝導性ペーストに関する。
本発明10は、カルボン酸の銀塩が、酢酸及びプロピオン酸からなる群より選ばれる少なくとも1種のカルボン酸の銀塩である、本発明3~9のいずれかに記載の熱伝導性ペーストに関する。
本発明12は、半導体装置のバンプ形成用の本発明1~10のいずれかに記載の熱伝導性ペーストに関する。
本発明13は、本発明1~12のいずれかに記載の熱伝導性ペーストを、部品の接合に使用した半導体装置に関する。
本発明15は、銀微粒子100質量部に対して、脂肪族第一級アミンを1~40質量部、リン酸基を有する化合物を0.001~2質量部含む熱伝導性ペーストを得る、本発明14記載の熱伝導性ペーストの製造方法に関する。
テルピネオール、リナロール、ゲラニオール、シトロネロール等のテルペンアルコール;
エチレングリコールモノエチルエーテル、エチレングリコールモノブチルエーテル、プロピレングリコールモノメチルエーテル、プロピレングリコールモノエチルエーテル、プロピレングリコールモノ-n-ブチルエーテル、エチレングリコールモノフェニルエーテル、プロピレングリコールモノ-tert-ブチルエーテル、ジエチレングリコールモノエチルエーテル、ジエチレングリコ-ルモノブチルエーテル、ジプロピレングリコールモノメチルエーテル、ジプロピレングリコールモノブチルエーテル、トリプロピレングリコールモノメチルエーテル等のエーテルアルコール系溶剤;
並びにエチレングリコールモノメチルエーテルアセテート、エチレングリコールモノエチルエーテルアセテート、ジエチレングリコールモノエチルエーテルアセテート、エチレングリコールモノブチルエーテルアセテート、ジエチレングリコールモノブチルエーテルアセテート、プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールモノエチルエーテルアセテート、ジプロピレングリコールモノエチルエーテルアセテート等のエステル系溶剤;水等が挙げられる。
銀微粒子を含む層に加えておく溶剤は、単独で用いてもよく、又は2種類以上を併用することもできる。
銀微粒子を含む層に加えておく溶剤は、例えば、水酸基を有し沸点が180~250℃のアルコール系溶剤であることが好ましく、中でも、ジエチレングリコールモノブチルエーテルアセテート、ジヒドロターピネオール、ベンジルアルコール、2-エチル-1,3-ヘキサンジオール、エチレングリコールモノフェニルエーテル等が好ましい。
銀微粒子を含む層に加えておく溶剤の含有量は、特に限定されないが、銀微粒子を含む層中に含まれる銀微粒子100質量部に対して、好ましくは1~30質量部、より好ましくは1~20質量部、さらに好ましくは1~10質量部である。
本発明の熱伝導性ペーストは、カルボン酸の銀塩と脂肪族第一級アミンを混合し、次いで還元剤を添加し、反応させて得られる銀微粒子を含む反応混合物に、リン酸基を有する化合物を混合して得られる。
熱伝導性ペースト中に含まれるアミン類は、銀微粒子同士の凝集を防ぐ一方で、熱処理時には、銀微粒子同士の融着の妨げとなっている。
本発明の熱伝導性ペーストは、銀微粒子と脂肪族第一級アミンと共に、リン酸基を有する化合物を含むことによって、焼成時に銀微粒子に配位しているアミン類とリン酸基を有する化合物のリン酸基とが反応し、アミン類を銀微粒子の周囲から除くことができる。本発明の熱伝導性ペーストは、特定の銀微粒子、脂肪族第一級アミン、及びリン酸基を有する化合物を含むことによって、低温の焼成によって銀微粒子同士の融着を促進し、銀膜の緻密性及び平滑性を確保し、熱伝導性をより改善することができる。焼成温度は、300℃以下、好ましくは200℃以下、より好ましくは180℃以下、特に好ましくは120~150℃の低温側の焼成温度であることが好ましい。
リン酸基を有する化合物は、リン酸(次亜リン酸、亜リン酸、ホスホン酸を含む)、ピロリン酸、ポリリン酸及びこれらのリン酸塩、並びにリン酸系界面活性剤からなる群より選択される少なくとも1種であることが好ましい。
ポリリン酸としては、トリポリリン酸、テトラポリリン酸等の直鎖状の縮合リン酸、メタリン酸、ヘキサメタリン酸等の環状の縮合リン酸、及びこのような鎖状、環状の縮合リン酸が結合したものを用いることができる。そして、これらの縮合リン酸の塩として、アンモニウム塩、ナトリウム塩、カリウム塩等を用いることができる。
リン酸基を有する界面活性剤は、酸価が50~140mgKOH/gの範囲であり、かつ、アミン価がほぼ0~100mgKOH/gの範囲である界面活性剤であることが好ましい。
(式中、mは1~10である。)で表される化合物を用いることができる。リン酸基を有する化合物として式(I)で表される化合物を用いる場合、式(I)で表される化合物とともにアミンが含まれている混合物の形態でもよい。その際、アミンの含有量としては、本発明の効果を損なわない範囲である。
熱硬化性樹脂としては、加熱により硬化するものであれば特に制限するものではなく、例えば、エポキシ樹脂、ウレタン樹脂、ビニルエステル樹脂、シリコーン樹脂、フェノール樹脂、ユリア樹脂、メラミン樹脂、不飽和ポリエステル樹脂、ジアリルフタレート樹脂、ポリイミド樹脂等が用いることができる。
熱可塑性樹脂としては、加熱により軟化するものであれば特に制限するものではなく、当該分野において公知のものを使用することができる。例えば、エチルセルロース、ニトロセルロース等のセルロース系樹脂、アクリル樹脂、アルキド樹脂、飽和ポリエステル樹脂、ブチラール樹脂、ポリビニルアルコール、ヒドロキシプロピルセルロース等を用いることができる。これらのバインダ樹脂は、単独で用いてもよく、又は2種類以上を併用することもできる。
熱伝導性ペースト中の銀微粒子100質量部に対する脂肪族第一級アミンの含有量が1~40質量部であると、銀微粒子の周囲に脂肪族第一級アミンが配位し、銀微粒子同士の凝集を防ぐことができる。
(1)反応容器に3-メトキシプロピルアミン4kg(45mol)を入れ、撹拌しながら反応温度を40℃以下に保持しつつ、酢酸銀5kg(30mol)を添加すると、酢酸銀は微黄色澄明な溶液となって溶解し、混合物を得た。
(2)混合物に、還元剤として95重量%のギ酸0.7kg(15mol)をゆっくり滴下し、その間、反応温度を30~40℃に保持すると、ギ酸の添加とともに銀微粒子が生成していき、微黄色澄明な溶液が次第に黒色へと変化した。ギ酸を全量滴下して反応を終了させて、反応混合物を得た。
(3)その後、得られた反応混合物に撹拌しながらメタノールを添加し、その後25℃で静置すると二層に分かれた。上層は黄色澄明な液であり、下層には黒色の銀微粒子(A1)が沈降した。上層の液をデカンテーションで除去し、さらにメタノール添加と静置、そしてデカンテーションを繰り返して銀微粒子を含有する層を回収した。銀微粒子を含有する層に、ジヒドロターピネオール0.3kgを加えて混合し、エバポレーターによって残存するメタノールを留去して、銀微粒子を含む銀含有率90質量%のペーストを得た。得られたペースト中の3-メトキシプロピルアミンは、ペースト中の銀微粒子100質量部に対して、2質量部であった。
開始温度:40℃
開始温度での保持時間:3分
昇温速度:15℃/分
終了温度:300℃
終了温度での保持時間:10分
カラムの種類: ULTRA ALLOY - 5 (フロンティア・ラボ社製)
キャリアガス:ヘリウムガス
キャリアガス流量(カラム流量):1.78 ml / 分
(1)反応容器にトルエン1.5kgを入れ、1,2-ジアミノシクロヘキサン0.9kg(8.0mol)を添加した後、撹拌しながら、反応温度を45℃以下に保持しつつ、酢酸銀2.5kg(15.0mol)を添加し、混合物を得た。
(2)反応系である混合物がほぼ均一になったことを確認した後、撹拌しながら、ギ酸0.5kg(10.5mol)を少量ずつ添加した。その間、反応温度を40~45℃に保持し、反応混合物を得た。
(3)その後、得られた反応混合物に撹拌しながらメタノールを添加し、その後25℃で静置すると二層に分かれた。上層は黄色澄明な液であり、下層には黒色の銀微粒子(A2)が沈降した。上層の液をデカンテーションで除去し、さらにメタノール添加と静置、そしてデカンテーションを繰り返して銀微粒子を含有する層を回収した。銀微粒子を含有する層に、ジヒドロターピネオール0.15kgを加えて混合し、エバポレーターによって残存するメタノールを留去して、銀微粒子を含む銀含有率90質量%のペーストを得た。得られたペースト中の1,2-ジアミノシクロヘキサンは、ペースト中の銀微粒子100質量部に対して、2質量部であった。
脂肪族第一級アミンとして3-メトキシプロピルアミンの代わりに2-メトキシエチルアミンを使用した以外は上記銀微粒子(A1)を含有するペーストの作製方法と同様にして、銀微粒子(A3)を含有するペーストを作製した。ペースト中の銀含有率は90質量%であった。得られたペースト中の2-メトキシエチルアミンは、ペースト中の銀微粒子100質量部に対して、2質量部であった。
脂肪族第一級アミンとして3-メトキシプロピルアミンの代わりに3-エトキシプロピルアミンを使用した以外は上記銀微粒子(A1)を含有するペーストの作製方法と同様にして、銀微粒子(A4)を含有するペーストを作製した。ペースト中の銀含有率は90質量%であった。得られたペースト中の3-エトキシプロピルアミンは、ペースト中の銀微粒子100質量部に対して、2質量部であった。
溶剤としてジヒドロターピネオールの代わりにジエチレングリコールモノフェニルエーテルを使用した以外は上記銀微粒子(A1)を含有するペーストの作製方法と同様にして、銀微粒子(A5)を含有するペーストを作製した。ペースト中の銀含有率は90質量%であった。得られたペースト中の3-メトキシプロピルアミンは、ペースト中の銀微粒子100質量部に対して、2質量部であった。
溶剤としてジヒドロターピネオールの代わりにエチレングリコールモノフェニルエーテルを使用した以外は上記銀微粒子(A1)を含有するペーストの作製方法と同様にして、銀微粒子(A5)を含有するペーストを作製した。ペースト中の銀含有率は90質量%であった。得られたペースト中の3-メトキシプロピルアミンは、ペースト中の銀微粒子100質量部に対して、2質量部であった。
(1)~(3)の工程によって得られる銀微粒子(A1)を含むペースト(銀含有率90質量%)に、(4)リン酸基を有する化合物として、リン酸水素アンモニウム、リン酸、リン酸系の界面活性剤(Disperbyk180又はDisperbyk111)を表2に示す各配合で加え、実施例1~6、12の熱伝導性ペーストを得た。表2中、各配合の単位は「質量部」である。
(式中、mは1~10である。)で表される化合物であった。リン酸系の界面活性剤としてのDisperbyk180は、式(I)で表される化合物とアミンとの混合物であった。
上記のとおり、(1)~(3)の工程によって得られる、銀微粒子(A2)を含むペースト(銀含有率90質量%)、銀微粒子(A3)を含むペースト(銀含有率90質量%)、銀微粒子(A4)を含むペースト(銀含有率90質量%)、銀微粒子(A5)を含むペースト(銀含有率90質量%)、又は銀微粒子(A6)を含むペースト(銀含有率90質量%)の各々に、(4)リン酸基を有する化合物として、リン酸水素アンモニウムを表2に示す各配合で加え、実施例7~11の熱伝導性ペーストを得た。表2中、各配合の単位は「質量部」である。
比較例1は、銀微粒子(A1)を含むペースト(銀含有率90質量%)を、熱伝導性ペーストとした。また、比較例2、3、4は、銀微粒子(A1)を含むペースト(銀含有率90質量%)に、リン酸基を有する化合物の代わりに、それぞれ「酢酸」、「アミノ基を有し、リン酸基を有していない界面活性剤」又は「リン元素を有し、リン酸を有していない化合物」を表2に示す各配合で添加した。比較例1~4の熱伝導性ペーストの各配合を表2に示す。
熱伝導性ペーストを、スライドガラス上に、幅0.5cm・長さ5.0cm・厚み100μmとなるように塗布し、送風乾燥機にて、室温(25℃)から3℃/分の昇温速度で加熱を開始し、120℃に到達したところで、その温度を維持しながらさらに1時間の加熱を行って、スライドガラス上に銀膜を形成した。その後、東京精密社製表面粗さ形状測定機(サーフコム300B)にて、得られた銀膜の膜厚を測定し、次いで東陽テクニカ社製マルチメーター(2001型(メモリー128K))を用いて四端子法にて電気抵抗の測定を行った。電気抵抗率(比抵抗)は、得られた加熱硬化後の膜厚、電気抵抗から求めた。
電気抵抗率(比抵抗)の評価は、10μΩ・cm未満の場合は○、10μΩ・cm以上の場合は×とした。
熱伝導性ペーストを、スライドガラス上に、塗布厚み1~2mmとなるように塗布し、そのままの状態で送風乾燥機にて、室温(25℃)から3℃/分の昇温速度で加熱を開始し、120℃に到達したところで、その温度を維持しながらさらに1時間の加熱を行った。加熱終了後、室温(25℃)まで十分に冷却し、スライドガラス上に形成された銀膜をスライドガラスから剥がした。こうして得られた銀膜について、レーザーフラッシュ法(NETZSCH社製 Xe フラッシュアナライザー)を用いて熱伝導率を測定し、熱伝導率の値を得た。一般的に鉛はんだの熱伝導率は、35~65W/m・Kである。
熱伝導率の評価は、65W/m・K以上の場合は○、65W/m・K未満の場合は×とした。
本発明の熱伝導性ペーストは、特定の粒子特性を有する銀微粒子と、脂肪族第一級アミンと、リン酸基を有する化合物とを含むことによって、焼成時に銀微粒子に配位しているアミン類が銀微粒子の周囲から取り除かれ、120℃の比較的低温の焼成によって銀微粒子同士の焼結が促進され、熱伝導性が改善された。
Claims (15)
- 1次粒子の平均粒子径が40~350nmであり、結晶子径が20~70nmであり、かつ結晶子径に対する平均粒子径の比が1~5である銀微粒子と、脂肪族第一級アミンと、リン酸基を有する化合物とを含む、熱伝導性ペースト。
- 銀微粒子を100質量部に対して、脂肪族第一級アミンを1~40質量部、リン酸基を有する化合物を0.001~2質量部含む、請求項1記載の熱伝導性ペースト。
- カルボン酸の銀塩と脂肪族第一級アミンを混合し、次いで還元剤を添加し、反応させて得られる銀微粒子を含む反応混合物に、リン酸基を有する化合物を混合して得られる、熱伝導性ペースト。
- 反応混合物が、銀微粒子100質量部に対して、脂肪族第一級アミンを1~40質量部含み、反応混合物にリン酸基を有する化合物を0.001~2質量部混合して得られる、請求項3記載の熱伝導性ペースト。
- リン酸基を有する化合物が、リン酸、ピロリン酸、ポリリン酸及びこれらのリン酸塩、並びにリン酸系界面活性剤からなる群から選ばれる少なくとも1種である、請求項1~4のいずれか1項記載の熱伝導性ペースト。
- 脂肪族第一級アミンが、2-メトキシエチルアミン、3-メトキシプロピルアミン、3-エトキシプロピルアミン及び1,2-ジアミノシクロヘキサンからなる群から選ばれる少なくとも1種の脂肪族第一級アミンである、請求項1~6のいずれか1項記載の熱伝導性ペースト。
- 脂肪族第一級アミンが、3-メトキシプロピルアミン及び1,2-ジアミノシクロヘキサンからなる群より選ばれる少なくとも1種の脂肪族第一級アミンである、請求項1~6のいずれか1項記載の熱伝導性ペースト。
- 還元剤が、ギ酸、ホルムアルデヒド、アスコルビン酸及びヒドラジンからなる群より選ばれる少なくとも1種の還元剤である、請求項3~6のいずれか1項記載の熱伝導性ペースト。
- カルボン酸の銀塩が、酢酸及びプロピオン酸からなる群より選ばれる少なくとも1種のカルボン酸の銀塩である、請求項3~9のいずれか1項記載の熱伝導性ペースト。
- 半導体装置のダイアタッチ用の請求項1~10のいずれか1項記載の熱伝導性ペースト。
- 半導体装置のバンプ形成用の請求項1~10のいずれか1項記載の熱伝導性ペースト。
- 請求項1~12のいずれか1項記載の熱伝導性ペーストを、部品の接合に使用した半導体装置。
- (1)カルボン酸の銀塩と脂肪族第一級アミンを混合する工程、
(2)還元剤を添加して、反応温度20~80℃で反応させる工程、
(3)反応生成物を層分離させて、銀微粒子を含有する層を回収する工程、
(4)回収した銀微粒子を含む層に、リン酸基を有する化合物を混合する工程を含む、熱伝導性ペーストの製造方法。 - 銀微粒子100質量部に対して、脂肪族第一級アミンを1~40質量部、リン酸基を有する化合物を0.001~2質量部含む熱伝導性ペーストを得る、請求項14記載の熱伝導性ペーストの製造方法。
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