WO2022070335A1 - グリース組成物およびそれを用いた電子部品 - Google Patents
グリース組成物およびそれを用いた電子部品 Download PDFInfo
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- WO2022070335A1 WO2022070335A1 PCT/JP2020/037230 JP2020037230W WO2022070335A1 WO 2022070335 A1 WO2022070335 A1 WO 2022070335A1 JP 2020037230 W JP2020037230 W JP 2020037230W WO 2022070335 A1 WO2022070335 A1 WO 2022070335A1
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- grease composition
- polymethacrylic acid
- based organic
- liquid resin
- organic particles
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
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- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
- C08L71/08—Polyethers derived from hydroxy compounds or from their metallic derivatives
- C08L71/10—Polyethers derived from hydroxy compounds or from their metallic derivatives from phenols
- C08L71/12—Polyphenylene oxides
- C08L71/123—Polyphenylene oxides not modified by chemical after-treatment
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/28—Nitrogen-containing compounds
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/08—Materials not undergoing a change of physical state when used
- C09K5/14—Solid materials, e.g. powdery or granular
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/06—Mixtures of thickeners and additives
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/28—Nitrogen-containing compounds
- C08K2003/282—Binary compounds of nitrogen with aluminium
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- C08K2201/00—Specific properties of additives
- C08K2201/001—Conductive additives
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/206—Applications use in electrical or conductive gadgets use in coating or encapsulating of electronic parts
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/06—Metal compounds
- C10M2201/061—Carbides; Hydrides; Nitrides
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- C—CHEMISTRY; METALLURGY
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/06—Metal compounds
- C10M2201/062—Oxides; Hydroxides; Carbonates or bicarbonates
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/04—Ethers; Acetals; Ortho-esters; Ortho-carbonates
- C10M2207/0406—Ethers; Acetals; Ortho-esters; Ortho-carbonates used as base material
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/283—Esters of polyhydroxy compounds
- C10M2207/2835—Esters of polyhydroxy compounds used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/08—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type
- C10M2209/084—Acrylate; Methacrylate
- C10M2209/0845—Acrylate; Methacrylate used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2213/00—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions
- C10M2213/006—Organic macromolecular compounds containing halogen as ingredients in lubricant compositions used as thickening agents
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
- C10M2215/061—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
- C10M2227/02—Esters of silicic acids
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
- C10M2229/006—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions used as thickening agents
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- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/02—Viscosity; Viscosity index
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/055—Particles related characteristics
- C10N2020/06—Particles of special shape or size
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/02—Pour-point; Viscosity index
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/28—Anti-static
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/10—Form in which the lubricant is applied to the material being lubricated semi-solid; greasy
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Definitions
- the present disclosure relates to a grease composition and electronic components using the same.
- the grease composition can improve heat dissipation by interposing it between the heating element and the heat dissipation element.
- a thermally conductive silicone putty composition containing zinc oxide or alumina based on silicone oil for example, Patent Document 1 is generally known from the viewpoint of thermal decomposition stability, flame retardancy and the like. Has been done.
- a non-silicone-based thermally conductive grease composition having improved pump-out resistance of silicone grease has been proposed (for example, Patent Document 2).
- Patent Document 2 a non-silicone-based thermally conductive grease composition having improved pump-out resistance of silicone grease.
- the non-silicone-based thermally conductive grease composition may contain components that are easily volatilized.
- the nonionic surfactant used for preventing pump-out described in Patent Document 2 has a high affinity with water, and therefore easily adsorbs water in the atmosphere. Therefore, when the non-silicone-based heat conductive grease composition is used for a semiconductor power module or the like for an inverter which is often used outdoors, there is a possibility that moisture is easily adsorbed in a high humidity environment. When the temperature of the semiconductor element rises in the hygroscopic state, the adsorbed moisture rapidly volatilizes to generate voids, which may reduce heat dissipation.
- the conventional non-silicone-based thermally conductive grease composition has not been sufficiently examined to maintain the pump-out resistance and the thermal conductivity for a long period of time.
- the present disclosure describes a grease composition in which the occurrence of pump-out is reduced, thermal conductivity is maintained, and void generation is reduced at a high temperature, particularly about 150 ° C., and the grease composition is used as a heating element and a radiator. Provides electronic components placed in between.
- the grease composition of the present disclosure contains (A) a liquid resin, (B) polymethacrylic acid-based organic particles, and (C) an inorganic filler, and the (A) liquid resin is a polyol, a polyether, and a diamine.
- the polymethacrylic acid-based organic particles (B) containing at least one selected from the resin are dissolved in an organic solvent having a solubility parameter (SP value) of 7.8 to 10.1.
- the electronic component of the present disclosure includes a heating element, a heat radiating element, and the grease composition of the present disclosure arranged between the heating element and the heat radiating element.
- the grease composition of the present disclosure can reduce the occurrence of pump-out at high temperatures, particularly about 150 ° C., maintain thermal conductivity, and reduce the occurrence of voids.
- the electronic components of the present disclosure exhibit sufficient thermal conductivity even when the heating element has a high temperature of about 150 ° C. by arranging the grease composition of the present disclosure between the heating element and the radiator. can do.
- the electronic components of the present disclosure are excellent in long-term reliability because they can maintain the same thermal conductivity even in the subsequent use.
- the grease composition of the present embodiment has (A) a liquid resin containing at least one selected from a polyol, a polyether, and a diamine resin, and (B) a solubility parameter (SP value) of 7.8 to 10. It contains polymethacrylic acid-based organic particles that are soluble in the solvent of 1 and (C) an inorganic filler.
- SP value solubility parameter
- grease refers to a semi-solid or solid state in which a thickener is dispersed in a raw material base oil based on JIS K2220: 2013.
- solid state includes a gel state in which the fluidity of the entire system is lost.
- the grease composition of the present embodiment (hereinafter, also referred to as “the present grease composition”) is a composition having the properties of grease.
- the grease composition changes from a semi-solid state to a gel state by losing fluidity due to the action of (B) polymethacrylic acid-based organic particles by heating as described later.
- the gelled grease composition is also referred to as "the present gel-like composition”.
- the liquid of the liquid resin means that it is liquid at room temperature.
- the liquid component means a viscosity measured by an E-type viscometer at 25 ° C. (for example, manufactured by VISCOMETER TPE-100 TOKISANGYO) of 200,000 mPa ⁇ s or less.
- the viscosity of a liquid substance refers to the viscosity measured by an E-type viscometer (for example, manufactured by VISCOMETER TPE-100 TOKISANGYO) at 25 ° C.
- the normal temperature refers to 5 to 40 ° C, preferably 15 to 30 ° C.
- This grease composition is used by being arranged between a heating element and a heat radiating element in an electronic component, for example, a heat generating component.
- the grease composition is applied to at least one of the heating element and the radiator at room temperature.
- the heating element and the heat radiating element are arranged via the grease composition.
- it is arranged by a step such as injecting the present grease composition between a heating element and a heat radiating element arranged at a predetermined distance. Since this grease composition has a grease property and a viscosity described later, it can be applied or injected with good workability between a heating element and a heat radiating element in a heating element, does not require heat treatment such as drying, and is an electronic component. Is easy to assemble.
- the grease composition gels in the process of raising the temperature to become the gel-like composition.
- gelation in the present grease composition is achieved by swelling (B) polymethacrylic acid-based organic particles among the components contained in the present grease composition with (A) a liquid resin.
- the temperature at which the present grease composition starts gelation is approximately 60 to 130 ° C., although it depends on the types of (A) liquid resin and (B) polymethacrylic acid-based organic particles.
- the present gel-like composition can also reduce the generation of voids.
- the gel-like composition obtained by gelling the grease composition has flexibility, it has excellent followability to the shape change even when the shape of the heating element and the radiator changes due to temperature decrease, and at low temperature. However, it has excellent adhesion and can maintain thermal conductivity. In addition, the present gel-like composition can reduce the generation of volatile components.
- this grease composition When this grease composition is used for heat-generating parts, after gelling at a high temperature as described above, even if the temperature returns from high temperature to room temperature, the grease composition remains in the gelled state of the gel-like composition. It exists between the heating element and the radiator. After that, even if the heating element repeatedly raises and lowers the temperature, the gel-like composition obtained by gelling the grease composition has little change in properties due to a temperature change, and the above effect can be maintained. As a result, the heat-generating component can be used stably for a long period of time.
- the liquid resin (A) contained in the present grease composition is a resin that is liquid at room temperature and contains at least one selected from a polyol, a polyether, and a diamine resin.
- the definition of liquid is as described above.
- the (A) liquid resin is mixed with the solid component contained in the present grease composition, specifically, (B) polymethacrylic acid-based organic particles and (C) the inorganic filler to form the present grease composition. It is a component that makes it grease-like.
- the (A) liquid resin permeates (B) polymethacrylic acid-based organic particles by heating, and (B) the polymethacrylic acid-based organic particles are swelled to gel the present grease composition and present the gel. It has a function of forming a state composition.
- the present grease composition can reduce the increase in fluidity due to temperature changes during use.
- the heat resistance of the liquid resin is mainly affected by the skeleton of the resin. In particular, the presence or absence of aromatic rings in the resin affects the weight loss at high temperatures. Since the liquid resin (A) has such heat resistance, it is possible to provide a grease composition having excellent long-term reliability. Further, the liquid resin (A) may be a resin having low hygroscopicity. (A) Since the liquid resin has low hygroscopicity, the generation of voids can be reduced.
- the liquid resin (A) is selected from the above-mentioned specific types of resins, but may be a heat-resistant resin with little weight loss.
- the liquid resin contains two or more kinds of resins
- the mixture obtained by mixing the two or more kinds may be liquid.
- the liquid resin may be obtained by mixing a solid resin and a liquid resin.
- the liquid resin may have a viscosity measured by an E-type viscometer, for example, VISCOMETER TPE-100 TOKISANGYO at 25 ° C., which may be 10 to 10000 mPa ⁇ s, or 100 to 1000 mPa ⁇ s. good.
- a viscosity measured by an E-type viscometer for example, VISCOMETER TPE-100 TOKISANGYO at 25 ° C., which may be 10 to 10000 mPa ⁇ s, or 100 to 1000 mPa ⁇ s. good.
- the liquid resin may have a mass reduction rate of less than 1% at 150 ° C. based on 25 ° C.
- the lower limit of the mass reduction rate is not particularly defined.
- the mass reduction rate is less than 1%, for example, the volatile matter can be reduced when the grease composition is arranged between the heating element and the heat radiating element when used for heat generating parts, and the heat radiating characteristics due to the generation of voids can be reduced. The decrease can be reduced.
- the mass reduction rate can be calculated as the mass change rate (decrease rate) before and after heating (A) the liquid resin is left in an oven at 150 ° C. for 24 hours.
- the liquid resin (A) may have high compatibility with (B) polymethacrylic acid-based organic particles from the viewpoint of efficiently swelling (B) polymethacrylic acid-based organic particles.
- the SP value of the liquid resin and (B) the SP value of the polymethacrylic acid-based organic particles may be close to each other.
- the SP value of the liquid resin may be 7.3 to 11.5.
- the SP value is a value defined by the regular solution theory introduced by Hildebrand. For example, the smaller the difference between the solubility parameters (SP values) of the two components, the greater the solubility.
- the SP value of the liquid resin (A) can be measured by the same method as the method for measuring the SP value of the polymethacrylic acid-based organic particles described later (B).
- the SP value of the mixed resin obtained by mixing the two or more kinds may be close to the SP value of the (B) polymethacrylic acid-based organic particles.
- the SP value of each of the mixed resins may be close to the SP value of the (B) polymethacrylic acid-based organic particles.
- polyol examples include polylactone polyols, polycarbonate polyols, aromatic polyols, alicyclic polyols, aliphatic polyols, polycaprolactone polyols, castor oil-based polyols, ethylene-vinyl acetate copolymers, polyether polyols, polyester polyols and the like. Can be mentioned. These can be used alone or in admixture of two or more.
- the polyol may be a polyester polyol from the viewpoint of low viscosity and heat resistance.
- polyester polyol examples include a polyhydric alcohol-polyvalent carboxylic acid condensation system polyol, a cyclic ester ring-opening polymerization system polyol, and the like.
- polyester polyol examples include, for example, NOF Corporation's Unistar (registered trademark) HR-32, Unistar (registered trademark) H-809RB, and the like.
- the polyether may be used alone or mixed with a polyol or a diamine resin.
- aromatic hydrocarbon system examples include polyethylene terephthalate, polybutylene terephthalate, polybutylene naphthalate, polystyrene, polysulfone, polyethersulfone, polyphenylsulfone, polyphenylsulfone, polyallylate, polyetherimide, polyimide, and polyamideimide. Can be mentioned. These can be used alone or in admixture of two or more.
- Phenyl ether type includes phenyl ether resin and alkyl phenyl ether resin. Specifically, diphenyl ether, tetraphenyl ether, pentaphenyl ether, alkyl diphenyl ether, monoalkyl triphenyl ether, monoalkyl tetraphenyl ether, dialkyl tetraphenyl tail, polyethylene glycol, polypropylene glycol, polybutylene glycol, poly (1-methyl). Butylene glycol) Perfluoropolyether, polyether monool, polyether diol, polyether triol and the like can be mentioned. These can be used alone or in admixture of two or more.
- the polyether may be a polyether containing phenyl ether from the viewpoint of heat resistance.
- phenyl ether-based polyether examples include, for example, LB-100, S-3105, S-3103, S-3101, S-3230, etc. manufactured by MORESCO Co., Ltd.
- diamine resin examples include p-phenylenediamine (PDA), m-phenylenediamine, 4,4'-oxydianiline (ODA), 3,3'-bistrifluoromethyl-4,4'-diaminobiphenyl (TFMB).
- PDA p-phenylenediamine
- ODA 4,4'-oxydianiline
- TFMB 3,3'-bistrifluoromethyl-4,4'-diaminobiphenyl
- diamine resin examples include Erasmer 1000P manufactured by Kumiai Chemical Industry Co., Ltd.
- the liquid resin may contain a polyether from the viewpoint of heat resistance.
- the content thereof may be 50 to 95% by mass or 70 to 95% by mass in the liquid resin (A).
- the liquid resin may contain other resins other than the polyol, the polyether, and the diamine resin, if necessary.
- other resins include epoxy resins and oxetane resins.
- the content thereof may be 10% by mass or less, 5% by mass or less, or 3% by mass or less.
- the content of the (A) liquid resin in the present grease composition may be 5 to 30% by mass or 5 to 10% by mass with respect to the total amount of the present grease composition.
- (A) When the content of the liquid resin is 5% by mass or more, the viscosity of the present grease composition does not become too high, and it becomes easy to obtain a semi-solid property. Further, when the content of (A) the liquid resin is 30% by mass or less, the viscosity of the present grease composition does not become too low, and the workability is improved.
- the (B) polymethacrylic acid-based organic particles used in the present grease composition are components having a function of adjusting the viscosity of the present grease composition by being mixed with (A) a liquid resin together with (C) an inorganic filler at room temperature. be. Further, in the (B) polymethacrylic acid-based organic particles, when heated to a predetermined temperature or higher, the liquid component contained in the grease composition, mainly (A) the liquid resin, permeates the (B) polymethacrylic acid-based organic particles. It has a function of gelling the present grease composition by swelling.
- the polymethacrylic acid-based organic particles are specifically particles of an organic compound having the above-mentioned functions.
- the predetermined temperature is generally 60 to 130 ° C., although it depends on the types of (A) liquid resin and (B) polymethacrylic acid-based organic particles.
- the organic compound constituting the polymethacrylic acid-based organic particles may have good compatibility with (A) the liquid resin as described above. Specifically, the SP value of (B) the polymethacrylic acid-based organic particles may be close to the SP value of (A) the liquid resin. When the SP value of the (B) polymethacrylic acid-based organic particles is close to the SP value of the (A) liquid resin, the swellability of the (B) polymethacrylic acid-based organic particles becomes high, and the gelation of the present grease composition is good. Proceed to.
- the polymethacrylic acid-based organic particles are selected from the polymethacrylic acid-based organic particles that are soluble in a solvent having an SP value of 7.8 to 10.1.
- "dissolving in a solvent having an SP value of 7.8 to 10.1" for the (A) liquid resin or (B) polymethacrylic acid-based organic particles means that the SP value is 7.8 to 10. It means that it may be dissolved in any one of the solvents described in 1., and it may be dissolved in a plurality of solvents having different SP values.
- the method for measuring the SP value of the solvent can be calculated using the method of Fedors. Whether or not it is soluble in a solvent having an SP value of 7.8 to 10.1 can be specifically measured by the method described in Examples.
- a solvent having an SP value of 7.0 to 12.7 can be used, and a solvent having such characteristics is particularly used. Not limited. Examples of this solvent include n-pentane (SP value: 7.0), n-hexane (SP value: 7.3), ethylhexyl acrylate (SP value: 7.8), and cyclohexane (SP value: 8.9).
- the polymethacrylic acid-based organic particles may be soluble in all solvents having an SP value of 7.8 to 10.1 with respect to solubility in the solvent.
- the organic compound constituting the polymethacrylic acid-based organic particles may be an acrylic resin or a polymethacrylic acid ester.
- the acrylic resin is a resin obtained by polymerizing acrylic acid, methacrylic acid, and derivatives thereof as a main monomer, and may contain a polymerization unit of another vinyl group-containing monomer.
- the polymethacrylic acid ester is a resin obtained by polymerizing the methacrylic acid ester as a main component monomer, and may contain a polymerization unit of a monomer other than the methacrylic acid ester, or may be a partially crosslinked product. From the viewpoint of swellability, it may be a non-crosslinked product.
- polymethacrylic acid ester examples include an alkyl methacrylate polymer, an alkyl methacrylate copolymer, an alkyl methacrylate ester copolymer, and a resin containing an alkyl acrylate / alkyl methacrylate copolymer as a main component.
- the main component means a component whose content exceeds 50% by mass.
- the (B) polymethacrylic acid-based organic particles may contain at least one selected from polyacrylic acid alkyl particles, polymethacrylic acid alkyl ester particles, and alkyl acrylate / alkyl methacrylate resin particles.
- the polymethacrylic acid-based organic particles may have an average degree of polymerization of 1,000 to 50,000 or 3,000 to 40,000 from the viewpoint of good swellability. , 4,000 to 30,000.
- the average degree of polymerization is 1,000 or more, the polymethacrylic acid-based organic particles (B) sufficiently swell and have pump-out resistance in the present grease composition or the present gel-like composition.
- the average degree of polymerization is 50,000 or less, the flexibility of the gel-like composition becomes good, and the occurrence of cracks or peeling can be reduced.
- the polymethacrylic acid-based organic particles may have an average particle diameter of 0.1 ⁇ m or more and 10.0 ⁇ m or less, or may be 0.3 ⁇ m or more and 5.0 ⁇ m or less.
- the average particle size in the present specification is a volume-based cumulative average particle size D50 measured by a dynamic light scattering type particle size measuring device.
- the polymethacrylic acid-based organic particles may be core-shell type particles.
- the polymethacrylic acid-based organic particles one type may be used alone, or two or more types may be mixed and used.
- the content of (B) polymethacrylic acid-based organic particles in the present grease composition may be 5 to 30 parts by mass or 7 to 25 parts by mass with respect to 100 parts by mass of (A) liquid resin. May be good.
- (B) When the content of the polymethacrylic acid-based organic particles is 5 parts by mass or more, the obtained grease composition is sufficiently gelled when heated, and pump-out due to a decrease in viscosity can be reduced. Further, when the content of (B) polymethacrylic acid-based organic particles is 30 parts by mass or less, the flexibility of the gel-like composition becomes good, and the occurrence of cracks or exfoliation can be reduced.
- the (C) inorganic filler used in the present grease composition is a component that adjusts the present grease composition to a grease-like viscosity together with (B) polymethacrylic acid-based organic particles.
- the inorganic filler is not particularly limited as long as it is an inorganic filler used for electronic parts, but may be an inorganic filler having thermal conductivity.
- thermal conductivity can be imparted to the present grease composition.
- the inorganic filler having thermal conductivity examples include metal oxides having a thermal conductivity of 10 W / m ⁇ K or more, metal nitrides, nitride compounds, metals, graphite, silicon carbide, silicon compounds and the like.
- metal oxides having a thermal conductivity of 10 W / m ⁇ K or more metal nitrides, nitride compounds, metals, graphite, silicon carbide, silicon compounds and the like.
- aluminum oxide, boron nitride, silicon nitride, silicon carbide, and aluminum nitride may be used.
- aluminum oxide or aluminum nitride may be used.
- the inorganic filler one kind may be used alone, or two or more kinds may be mixed and used.
- the shape of the inorganic filler is not particularly limited, but may be spherical or irregular.
- the size of the inorganic filler may be 0.1 to 40 ⁇ m or 0.2 to 30 ⁇ m in average particle size from the viewpoint that the present grease composition obtains uniform grease-like properties. May be good.
- the inorganic filler may be used in combination with an inorganic filler having a different average particle diameter, for example, an inorganic filler (Ca) having a large average particle diameter and an inorganic filler (Cb) having a small average particle diameter. ..
- the average particle size of the inorganic fillers (Ca) and (Cb) can be determined in a suitable range depending on the material.
- the inorganic filler (C) is alumnium nitride particles
- the alumnium nitride particles (Ca-1) having an average particle diameter of 20 to 40 ⁇ m and the alumnium nitride particles (Cb-1) having an average particle diameter of 1 to 10 ⁇ m are used. May be used in combination.
- the alumnium nitride particles (Ca-1) and the alumnium nitride particles (Cb-1) it is possible to increase the filling rate of the (C) inorganic filler in the present grease composition.
- alumnium nitride particles (Ca-1) and alumnium nitride particles (Cb-1) When alumnium nitride particles (Ca-1) and alumnium nitride particles (Cb-1) are used in combination, the mass ratio when the total of these mixtures is 100, alumnium nitride particles (Ca-1): nitriding.
- the alumnium particles (Cb-1) may be in the range of 10:90 to 80:20 or in the range of 50:50 to 80:20.
- the mixing ratio is in the range of 10:90 to 80:20, good close packing is obtained and the thermal conductivity is improved.
- the (C) inorganic filler is aluminum oxide particles
- the mass ratio when the total of these mixtures is 100 is the mass ratio of aluminum oxide particles (Ca-2): oxidation.
- the aluminum particles (Cb-2) may be in the range of 40:60 to 95: 5, or may be in the range of 50:50 to 90:10. When the mixing ratio is in the range of 40:60 to 95: 5, good close packing is obtained and the thermal conductivity is improved.
- the content of the (C) inorganic filler in the present grease composition may be 350 to 2000 parts by mass or 500 to 1800 parts by mass with respect to 100 parts by mass of the liquid resin (A) 800. It may be up to 1500 parts by mass.
- the content of the inorganic filler is 350 parts by mass or more, the obtained grease composition can obtain a desired viscosity. Further, when the content of (C) the inorganic filler is 2000 parts by mass or less, the processability at the time of producing the present grease composition is good, and the grease composition has an appropriate fluidity. Therefore, the present grease composition can be easily placed on the heat-generating component by coating or injecting.
- the content of the (C) inorganic filler in the present grease composition may be 70 to 95% by mass or 80 to 95% by mass with respect to the total amount of the present grease composition.
- the grease composition may contain (D) a silane coupling agent.
- the (D) silane coupling agent is used to modify the surface texture of the (C) inorganic filler, and known silane coupling agents in this type of composition can be used.
- silane coupling agents include amino group, phenyl group, epoxy group, isocyanate group, isocyanurate group, vinyl group, styryl group, methacrylic group, acrylic group, ureido group, titanate group, acid anhydride and the like. It can be used without any particular limitation as long as it contains.
- a silane coupling agent one of these may be used alone, or two or more thereof may be mixed and used.
- (D) a silane coupling agent is used, (C) the inorganic filler may be directly treated, and then (A) a liquid resin and (B) polymethacrylic acid-based organic particles may be mixed, or may be used. A liquid resin, (B) polymethacrylic acid-based organic particles, (C) an inorganic filler, and (D) a silane coupling agent may be mixed together.
- the content of the (D) silane coupling agent in the present grease composition may be 0.02 to 5 parts by mass with respect to 100 parts by mass of the (C) inorganic filler, and 0.03 to 2 parts by mass. There may be.
- the content of each of these additives in the present grease composition shall be about 0.05 to 15% by mass for each additive and the total amount of the additives with respect to the total amount of the present grease composition. It may be 0.2 to 10% by mass.
- the total content of (A) liquid resin, (B) polymethacrylic acid-based organic particles, and (C) inorganic filler in the present grease composition may be 80% by mass or more, or 90% by mass or more. It may be present, and may be 95% by mass or more.
- the grease composition comprises the above-mentioned (A) liquid resin, (B) polymethacrylic acid-based organic particles, (C) an inorganic filler, (D) a silane coupling agent, and various types, if necessary. It can be produced by weighing and blending the additives so as to have the above-mentioned contents, and mixing and stirring.
- the method of such mixing and stirring is not particularly limited, and can be appropriately selected depending on the type, viscosity and content of each component. Specific examples thereof include a method using a stirrer such as a dissolver mixer and a homo mixer.
- what is mixed and stirred in this way may be filtered, for example, in order to remove a mass of undispersed components, if necessary.
- a homogeneous grease composition can be obtained.
- the bubbles generated in the composition during such mixing and stirring may be defoamed under reduced pressure. By performing such defoaming, it is possible to reduce the generation of bubbles in the obtained grease composition.
- the present grease composition has grease properties. That is, the present grease composition has a viscosity at 25 ° C. of about 100 to 1000 Pa ⁇ s, may be 110 to 600 Pa ⁇ s, or may be 120 to 500 Pa ⁇ s.
- the viscosity can be measured by a leometer, and specifically, by the method described in Examples.
- the present grease composition starts gelation at about 60 to 130 ° C. to become the present gel-like composition. Therefore, when the grease composition is used in an application involving a temperature change, if the gelation start temperature is exceeded at the time of temperature rise, the grease composition is subsequently used as the gel-like composition.
- the fluidity of the resin composition increases as the temperature rises, but the gel-like composition has the property that the fluidity of the entire system is reduced to the extent that the fluidity is lost or slightly fluidized. be.
- the gel-like composition has a viscosity at 150 ° C. of about 190 to 10000 Pa ⁇ s, may be 200 to 5000 Pa ⁇ s, or may be 210 to 3000 Pa ⁇ s.
- the viscosity can be measured by a leometer, and specifically, by the method described in Examples.
- a viscosity ratio (V 150 ° C / V 25 ° C ) can be used as an index for evaluating the change in the properties of the grease composition.
- the viscosity ratio (V 150 ° C / V 25 ° C ) was obtained by measuring the viscosity value at 25 ° C (V 25 ° C ) and the viscosity value at 150 ° C (V 150 ° C ) with a leometer, and V 25 ° C and V were obtained. It can be calculated from the value at 150 ° C.
- the viscosity ratio (V 150 ° C / V 25 ° C ) of this grease composition is 1.05 or more, the properties of the gel are shown.
- V 150 ° C. is under the conditions of temperature range: 25 to 200 ° C., temperature rise rate: 10 ° C./min, temperature decrease rate: 10 ° C./min, frequency: 1 Hz (constant), shear strength: 10 Pa (constant). It is a value measured at 150 ° C.
- the thermal conductivity (W / m ⁇ K) in the present grease composition may be 1 W / m ⁇ K or more, or 2 W / m ⁇ K or more. Further, after the grease composition was subjected to a cold heat cycle at -40 to 150 ° C. under the setting conditions of 1000 cycles, the grease composition became the gel-like composition, but the heat of the gel-like composition was obtained.
- the conductivity (W / m ⁇ K) may be 1 W / m ⁇ K or more, or 2 W / m ⁇ K or more.
- the gel-like composition obtained by gelling the present grease composition tends to have a higher thermal conductivity (W / m ⁇ K) than the present grease composition.
- FIG. 1 is a schematic diagram showing a schematic configuration of an embodiment of the present electronic component.
- the electronic component (hereinafter, also referred to as “the electronic component”) 10 of the present embodiment is arranged between the heating element 1, the heat radiating element 2, and the heating element 1 and the radiating element 2.
- the present grease composition 3 is obtained.
- the heating element 1 may be provided on the substrate 4. Further, the substrate 4 provided with the heating element 1 and the heat radiating element 2 may be fixed by screws 5.
- Examples of electronic components include electronic devices, inverters, and the like, which may be electronic devices.
- examples of the heating element include an IC chip, a CPU chip, a GPU chip, and the like.
- examples of the heating element include IGBTs, and examples of the radiator include heat sinks.
- the above-mentioned coating or injection can be mentioned. Applying or injecting can generally be done in a manner similar to that in which grease products are applied or infused.
- the grease composition gels in the process when the heating element reaches a high temperature, for example, about 150 ° C.
- the gel-like composition is obtained, and in subsequent use, it exists as the present gel-like composition between the heating element and the radiator.
- the thickness of the grease composition or the gel-like composition arranged between the heating element and the heat radiating element may be 5 to 500 ⁇ m from the viewpoint of improving pump-out resistance and heat radiating property. It may be 50 to 400 ⁇ m.
- A Liquid resin
- A-1 Alkyl diphenyl ether (manufactured by MORESCO Co., Ltd., LB-100, viscosity at 25 ° C.: 200 mPa ⁇ s, oxidation: ⁇ 0.1 mgKOH / g, mass reduction rate: ⁇ 0.1%, SP value: 7.3 to 9.1)
- A-2 Pentaphenyl ether (manufactured by MORESCO Co., Ltd., S-3105, viscosity at 25 ° C.: 570 mPa ⁇ s, oxidation: ⁇ 0.1 mgKOH / g, mass reduction rate: ⁇ 0.1%, SP value: 7 .3-9.1)
- A-3 Tetraphenyl ether (manufactured by MORESCO Co., Ltd., S-3103, viscosity at 25 ° C.: 240 mPa ⁇ s, oxidation: ⁇ 0.1 mgKOH / g, mass reduction rate: ⁇ 0.1%,
- the mass reduction rate of (A) liquid resin was calculated as the mass change rate (decrease rate) before and after heating after leaving 30 g of (A) liquid resin in an oven at 150 ° C. for 24 hours.
- B-1 Alkyl methacrylate polymer (manufactured by Aica Kogyo Co., Ltd., Zephyac F320, average particle size: 2 ⁇ m, average degree of polymerization: 30,000)
- B-2 Alkyl methacrylate copolymer (manufactured by Aica Kogyo Co., Ltd., Zephyac F340M, average particle size: 1 ⁇ m, average degree of polymerization: 30,000)
- B-3 Alkyl methacrylate polymer (manufactured by Aica Kogyo Co., Ltd., Zephyac F325, average particle size: 1 ⁇ m, average degree of polymerization: 40,000)
- B-4 Methacrylic acid alkyl ester copolymer (manufactured by Aica Kogyo Co., Ltd., Zephyac F303, average particle size: 2 ⁇ m, average degree of polymerization: 20,000)
- B-5 Methacrylic acid alkyl ester copo
- Resin particles 1 Methyl methacrylate crosslinked product (manufactured by Nippon Shokubai Co., Ltd., Epostal (registered trademark) MA1002, average particle size: 2 ⁇ m)
- Resin particles 2 Methyl methacrylate crosslinked product (manufactured by Nippon Shokubai Co., Ltd., Epostal (registered trademark) MA1004, average particle diameter: 4 ⁇ m)
- Resin particles 3 Silicone rubber (manufactured by Shin-Etsu Chemical Co., Ltd., KMP-597, average particle diameter: 1 ⁇ m, average degree of polymerization: 30,000)
- Resin particles 4 Fluorine particles (manufactured by AGC Inc., L-173JE, average particle diameter: 2 ⁇ m, average degree of polymerization: 30,000)
- Methacrylate copolymer (liquid) manufactured by Toagosei Co., Ltd., UH-2190, average degree of polymerization: ⁇ 1,000
- Ca-1 Aluminum nitride particles (manufactured by Furukawa Electric Co., Ltd., FAN-f30, average particle diameter: 30 ⁇ m)
- Cb-1 Aluminum nitride particles (manufactured by Furukawa Electric Co., Ltd., FAN-f05, average particle diameter: 5 ⁇ m)
- Ca-2 Aluminum oxide particles (manufactured by Sumitomo Chemical Co., Ltd., AA-18, average particle size: 20 ⁇ m)
- Cb-2 Aluminum oxide particles (manufactured by Sumitomo Chemical Co., Ltd., AA-1.5, average particle size: 1.5 ⁇ m)
- Silane coupling agent D-1 3-glycidoxypropyltrimethoxysilane (manufactured by Evonik Japan Co., Ltd., Dynasylan (registered trademark) GLYMO)
- the solubility of resin particles 1 to 4 other than (A) liquid resin, (B) polymethacrylic acid-based organic particles, and (B) polymethacrylic acid-based organic particles was investigated.
- the 10 types of solvents shown in Table 1 were prepared, and 0.1 g of each of the component (A), the component (B) and the resin particles 1 to 4 were added to 5 g of the solvents having different SP values, and the temperature was room temperature (25 ° C.). A stirrer was applied and the mixture was stirred for 1 hour under the above environment. After stirring, their solubility was confirmed. Solubility was evaluated as "A” as a transparent substance that was sufficiently dissolved after stirring, and as "C” as a translucent or cloudy substance that was not sufficiently dissolved. .. The evaluation results are shown in Table 1.
- Examples 1 to 23, Comparative Examples 1 to 5 The above-mentioned materials were prepared so as to have the compositions shown in Tables 2-1 to 2-3 to obtain grease compositions of Examples 1 to 23 and Comparative Examples 1 to 5. In Tables 2-1 to 2-3, blanks indicate no compounding. Furthermore, the following evaluation was performed using the grease composition obtained in each example. The results are also shown in Tables 2-1 to 2-3.
- the viscosity at 25 ° C. was V 25 ° C.
- the viscosity at 150 ° C. was V 150 ° C.
- the viscosity ratio (V 150 ° C./V 25 ° C. ) was calculated from the values of V 25 ° C. and V 150 ° C.
- a cold cycle test was carried out with a cold cycle tester (trade name: TSA-100SW, manufactured by Espec Co., Ltd.) under the set conditions. After the cold cycle test, the three layers were taken out, and the state of the grease composition or the gelled product thereof between the slide glasses was visually observed and evaluated according to the following criteria.
- A The dripping is less than 3 mm.
- C The dripping is 3 mm or more.
- Void rate is less than 3%
- B Void rate is 3% or more and less than 6%
- C Void rate is 6% or more
- Thermal conductivity (before and after the cold cycle test, after continuous heating at 150 ° C)
- the thermal conductivity was measured using a diffusivity measuring device (LFA467, manufactured by Netch Japan Co., Ltd.).
- the grease composition was placed in an aluminum cup container having a diameter of 12.7 mm and covered with an aluminum lid having a diameter of 9 mm to form a three-layer structure.
- the grease composition was adjusted so that the thickness of the grease composition was 350 ⁇ m ⁇ 50 ⁇ m, and the grease composition was placed in a liquid measurement holder.
- the thermal diffusivity obtained by the xenon flash method was corrected, and the thermal diffusivity including the interfacial thermal resistance was obtained excluding the thermal diffusivity of aluminum.
- the obtained thermal diffusivity including the interfacial thermal resistance, the density of the grease composition, and the specific heat were introduced into the following formula (1) to calculate the thermal conductivity, which was used as the thermal conductivity before the cold cycle test.
- the density was measured using a high-precision electronic hydrometer (SD-200L, manufactured by Alpha Mirage Co., Ltd.).
- the specific heat measurement was performed using a differential scanning calorimeter (DSC-6200, manufactured by Seiko Instruments Inc.).
- Thermal conductivity (W / m ⁇ K) thermal diffusivity (mm 2 / s) x density (g / cm 3 ) x specific heat (J / (kg ⁇ K)) ... (1)
- the grease composition between the slide glasses or the gelled product thereof was taken out from the three-layered body after the thermal cycle test was carried out in the evaluation of the pump-out resistance, and the thermal conductivity was calculated by the same method as in (4) above. The thermal conductivity was used after the cold cycle test.
- the thermal conductivity was calculated by the same method as in (4) above, and used as the thermal conductivity after continuous heating at 150 ° C.
- Mass reduction rate (%) 50 g of the grease composition was placed in a 50 cc glass tube, and a cold cycle test was carried out with a cold cycle tester under the setting conditions of ⁇ 40 to 150 ° C. and 1000 cycles.
- the mass reduction rate (change rate) was calculated from the mass W1 before the cold cycle test and the mass W2 after the cold cycle test of the grease composition.
- Thermal resistance value Infineon's semiconductor power module components (length 106 mm x width 61 mm x thickness 30 mm, element TjMAX: 150 ° C.) have a grease composition with a thickness of 150 ⁇ m on the metal base substrate side of the component. It was applied and installed on a copper plate having a length of 210 mm, a width of 60 mm, and a thickness of 10 mm. For installation, screws were installed at 6 screw holes and fixed with a tightening torque of 200 cN / cm. The copper plate on which the semiconductor power module was installed was placed vertically, and the elements inside the component generated heat by applying a voltage to the terminals of the semiconductor power module. The voltage was turned ON / OFF (holding time: 3 seconds) for 5000 cycles, and the thermal resistance after 5000 cycles was evaluated.
- the grease composition of the present disclosure has a viscosity of 110 to 590 Pa ⁇ s at 25 ° C., and therefore has good processability and good fluidity. It is easy to apply to heat-generating parts. In addition, low thermal resistance can be realized because the interface has good wettability and followability. Further, the grease composition is gelled by the heat generated by the heat-generating component to become the present gel-like composition, which is difficult to pump out. After the cold cycle test, the thermal conductivity is improved by 0.5 W / m ⁇ K or more.
- this grease composition is easy to apply to heat-generating parts, and even if the heat-generating parts reach a high temperature, for example, about 150 ° C. after application, they gel and the decrease in viscosity is suppressed. It is difficult to pump out.
- the present grease composition has an improved thermal conductivity of 0.5 W / m ⁇ K or more, it is possible to compensate for the decrease in heat dissipation due to deterioration of parts during long-term use, and it is possible to exhibit stable performance. ..
- this grease composition is used as a grease used to transfer heat generated from heat-generating components such as electronic devices, for example, locally heat-generating IC chips, CPU chips, GPU chips, IGBTs, etc., to heat-dissipating parts such as heat sinks. It is useful.
- Heating element 1 Heating element 2 Heat radiator 3 Grease composition 4 Board 5 Screws 10 Electronic components
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Abstract
Description
本実施形態のグリース組成物は、(A)ポリオール、ポリエーテル、及びジアミン樹脂から選ばれる少なくとも1種を含む液状樹脂、(B)溶解度パラメーター(Solubility Parameter:SP値)が7.8~10.1の溶剤に溶解するポリメタクリル酸系有機粒子、及び(C)無機充填材を含む。
また、本明細書において、常温とは5~40℃を指し、好ましくは15~30℃である。
本グリース組成物は、グリース性状であり、後述する粘度を有することから、発熱部品において発熱体と放熱体の間に作業性良く塗布又は注入することができ、乾燥等熱処理がいらず、電子部品の組み立てが容易である。
〔(A)液状樹脂〕
本グリース組成物が含有する(A)液状樹脂は、常温において液状の樹脂であり、ポリオール、ポリエーテル、及びジアミン樹脂から選ばれる少なくとも1種を含む樹脂である。液状の定義は上記のとおりである。(A)液状樹脂は、本グリース組成物が含有する固形成分、具体的には、(B)ポリメタクリル酸系有機粒子および(C)無機充填材と混合されることで、本グリース組成物をグリース状とする成分である。また、(A)液状樹脂は、加熱により(B)ポリメタクリル酸系有機粒子に浸透し、(B)ポリメタクリル酸系有機粒子を膨潤させることで、本グリース組成物をゲル化させて本ゲル状組成物とする機能を有する。これにより、本グリース組成物は使用時に温度変化に伴う流動性の増加を低減することができる。
(A)液状樹脂は、上記特定の種類の樹脂から選ばれるが、重量減少が少ない耐熱性の樹脂であってもよい。
上記SP値は、ヒルデブラント(Hildebrand)によって導入された正則溶液論により定義された値であり、例えば、2つの成分の溶解度パラメーター(SP値)の差が小さいほど溶解度が大となる。
なお、(A)液状樹脂のSP値は、後述する(B)ポリメタクリル酸系有機粒子のSP値の測定方法と同一の方法で測定することができる。
ポリオールとしては、低粘度化および耐熱性の観点から、ポリエステルポリオールであってもよい。
ジアミン樹脂は、耐熱性の観点から、ポリテトラメチレンオキシド-ジ-p-アミノベンゾエートであってもよい。
(A)液状樹脂が、その他の樹脂を含有する場合、その含有量は、10質量%以下であってもよく、5質量%以下であってもよく、3質量%以下であってもよい。
本グリース組成物に用いる(B)ポリメタクリル酸系有機粒子は、常温においては(C)無機充填材とともに(A)液状樹脂と混合されて本グリース組成物の粘度を調整する機能を有する成分である。また、(B)ポリメタクリル酸系有機粒子は、所定温度以上に加熱した場合に、本グリース組成物が含有する液状成分、主として(A)液状樹脂が(B)ポリメタクリル酸系有機粒子に浸透し膨潤することで、本グリース組成物をゲル化させる機能を有する。(B)ポリメタクリル酸系有機粒子は、具体的には上記機能を有する有機化合物の粒子である。本グリース組成物において上記所定温度は、(A)液状樹脂と(B)ポリメタクリル酸系有機粒子の種類によるが、概ね60~130℃である。
ポリメタクリル酸エステルの具体例として、メタクリル酸アルキル重合体、メタクリル酸アルキル共重合体、メタクリル酸アルキルエステル共重合体、アクリル酸アルキル・メタクリル酸アルキル共重合体を主成分とする樹脂が挙げられる。ここで主成分とは、その含有量が50質量%を超える成分をいう。
(B)ポリメタクリル酸系有機粒子はコアシェル型の粒子であってもよい。(B)ポリメタクリル酸系有機粒子は、1種を単独で使用してもよく、2種以上を混合して使用してもよい。
本グリース組成物に用いる(C)無機充填材は、(B)ポリメタクリル酸系有機粒子とともに本グリース組成物をグリース状の粘度に調整する成分である。(C)無機充填材は、電子部品に用いる無機充填材であれば特に限定はないが、熱伝導性を有する無機充填材であってもよい。(C)無機充填材として、熱伝導性を有する無機充填材を用いることで、本グリース組成物に熱伝導性を付与することができる。熱伝導性を有する無機充填材としては、熱伝導率が10W/m・K以上の金属酸化物、金属窒化物、窒化化合物、金属、黒鉛、炭化珪素、珪素化合物等が挙げられる。これらの中でも、酸化アルミニウム、窒化ホウ素、窒化珪素、炭化珪素、窒化アルミニウムであってもよい。特に高熱伝導性の観点から、酸化アルミニウム、窒化アルミニウムであってもよい。(C)無機充填材は、1種を単独で使用してもよく、2種以上を混合して使用してもよい。
窒化アルムニウム粒子(Ca-1)と窒化アルムニウム粒子(Cb-1)とを組み合わせて用いた場合、これらの混合物の合計を100としたときの質量比で、窒化アルムニウム粒子(Ca-1):窒化アルムニウム粒子(Cb-1)として、10:90~80:20の範囲であってもよく、50:50~80:20の範囲であってもよい。該混合割合が10:90~80:20の範囲内であると良好な最密充填が得られ熱伝導率が向上する。
本グリース組成物は、(D)シランカップリング剤を含有してもよい。(D)シランカップリング剤は、(C)無機充填材の表面性状を改質するために用いられ、この種の組成物における公知のシランカップリング剤を用いることができる。
上記粘度は、レオメーターにより測定することができ、具体的には、実施例に記載の方法により測定することができる。
上記粘度は、レオメーターにより測定することができ、具体的には、実施例に記載の方法により測定することができる。
図1は、本電子部品の一実施形態の概略構成を示す模式図である。
本実施形態の電子部品(以下、「本電子部品」ともいう。)10は、図1に示すように、発熱体1と、放熱体2と、発熱体1と放熱体2との間に配置された本グリース組成物3と、を有する。発熱体1は基板4上に設けられていてもよい。また、発熱体1が設けられた基板4と放熱体2とがネジ5で固定されていてもよい。
実施例および比較例の組成物の調製に用いた材料を以下に示す。
A-1:アルキルジフェニルエーテル((株)MORESCO製、LB-100、25℃における粘度:200mPa・s、酸化:<0.1mgKOH/g、質量減少率:<0.1%、SP値:7.3~9.1)
A-2:ペンタフェニルエーテル((株)MORESCO製、S-3105、25℃における粘度:570mPa・s、酸化:<0.1mgKOH/g、質量減少率:<0.1%、SP値:7.3~9.1)
A-3:テトラフェニルエーテル((株)MORESCO製、S-3103、25℃における粘度:240mPa・s、酸化:<0.1mgKOH/g、質量減少率:<0.1%、SP値:7.3~9.1)
A-4:モノアルキルテトラフェニルエーテル((株)MORESCO製、S-3101、25℃における粘度:470mPa・s、酸化:<0.1mgKOH/g、質量減少率:<0.1%、SP値:7.3~9.1)
A-5:ジアルキルテトラフェニルエーテル((株)MORESCO製、S-3230、25℃における粘度:800mPa・s、酸化:<0.1mgKOH/g、質量減少率:<0.1%、SP値:7.3~9.1)
A-6:ポリエステルポリオール(日油(株)製、ユニスター(登録商標)HR-32、25℃における粘度:480mPa・s、酸化:0.1mgKOH/g、質量減少率:<0.1%、SP値:7.3~9.1)
A-7:ポリエステルポリオール(日油(株)製、ユニスター(登録商標)H-609BR、25℃における粘度:900mPa・s、酸化:0.1mgKOH/g、質量減少率:<0.1%、SP値:7.3~9.9)
A-8:ポリテトラメチレンオキシド-ジ-p-アミノベンゾエート(クミアイ化学工業(株)製、エラスマー1000P、25℃における粘度:8000mPa・s、アミン価:84.4mgKOH/g、質量減少率:<0.1%、SP値:8.9~11.5)
B-1:メタクリル酸アルキル重合体(アイカ工業(株)製、ゼフィアックF320、平均粒子径:2μm、平均重合度:30,000)
B-2:メタクリル酸アルキル共重合体(アイカ工業(株)製、ゼフィアックF340M、平均粒子径:1μm、平均重合度:30,000)
B-3:メタクリル酸アルキル重合体(アイカ工業(株)製、ゼフィアックF325、平均粒子径:1μm、平均重合度:40,000)
B-4:メタクリル酸アルキルエステル共重合体(アイカ工業(株)製、ゼフィアックF303、平均粒子径:2μm、平均重合度:20,000)
B-5:メタクリル酸アルキルエステル共重合体(アイカ工業(株)製、ゼフィアックF301、平均粒子径:2μm、平均重合度:20,000)
B-6:アクリル酸アルキル・メタクリル酸アルキル共重合体(アイカ工業(株)製、ゼフィアックF351、平均粒子径:0.5μm、平均重合度:40,000)
樹脂粒子1:メタクリル酸メチル架橋物((株)日本触媒製、エポスター(登録商標) MA1002、平均粒子径:2μm)
樹脂粒子2:メタクリル酸メチル架橋物((株)日本触媒製、エポスター(登録商標) MA1004、平均粒子径:4μm)
樹脂粒子3:シリコーンゴム(信越化学工業(株)製、KMP-597、平均粒子径:1μm、平均重合度:30,000)
樹脂粒子4:フッ素系粒子(AGC(株)製、L-173JE、平均粒子径:2μm、平均重合度:30,000)
Ca-1:窒化アルミニウム粒子(古河電気工業(株)製、FAN-f30、平均粒子径:30μm)
Cb-1:窒化アルミニウム粒子(古河電気工業(株)製、FAN-f05、平均粒子径:5μm)
Ca-2:酸化アルミニウム粒子(住友化学(株)製、AA-18、平均粒子径:20μm)
Cb-2:酸化アルミニウム粒子(住友化学(株)製、AA-1.5、平均粒子径:1.5μm)
・D-1:3-グリシドキシプロピルトリメトキシシラン(エボニック ジャパン(株)製、Dynasylan(登録商標) GLYMO)
溶解性は、撹拌した後、透明となっているものを十分に溶解しているものとして「A」、半透明又は白濁しているものを十分に溶解していないものとして「C」として評価した。評価結果を表1に示した。
上記した材料を、表2-1~表2-3に示す組成となるように調製し、実施例1~23および比較例1~5のグリース組成物を得た。なお、表2-1~表2-3において空欄は配合なしを表す。さらに、各例で得られたグリース組成物を用いて以下の評価を行った。結果を表2-1~表2-3に併せて示す。
グリース組成物の5~10gをレオメーター(キネクサスpro+、スペクトリス(株)社製)を用いて、温度範囲:25~200℃、昇温速度:10℃/min、周波数:1Hz(一定)、せん断強度:10Pa(一定)の条件下で測定した。25℃における粘度をV25℃とし、150℃における粘度をV150℃とした。また、V25℃およびV150℃の値から粘度比(V150℃/V25℃)を算出した。
グリース組成物の0.5~1.0gを150μmのスペーサーを設けたスライドガラス上の略中心に滴下し、スペーサーの無い(短辺26mm×長辺76mm×厚み1.3mm)スライドガラスでグリース組成物を挟み込み、該グリース組成物を直径10mmの円形にした。この時、グリース組成物がスライドガラスからはみださないようにした。スライドガラス/グリース組成物/スライドガラスの3層体の両サイドをクリップで止めた。クリップのクランプ力は2.5kgを適用した。3層体を長辺側が下になるように縦置きにし、-40~150℃、1000サイクル(保持時間:30分間、昇温時間:10℃/秒、降温時間:10℃/秒、)の設定条件にて冷熱サイクル試験機(商品名:TSA-100S-W、エスペック(株)製)により冷熱サイクル試験を実施した。該冷熱サイクル試験後、3層体を取り出し、スライドガラス間のグリース組成物またはそのゲル化物の状態を目視で観察し、以下の基準で評価した。
C:液だれが3mm以上である。
グリース組成物の0.5~1.0gを150μmのスペーサーを設けたスライドガラス上の略中心に滴下し、スペーサーの無い(短辺26mm×長辺76mm×厚み1.3mm)スライドガラスでグリース組成物を挟み込み、該グリース組成物を直径10mmの円形にした。この時、グリース組成物がスライドガラスからはみださないようにした。スライドガラス/グリース組成物/スライドガラスの3層体の両サイドをクリップで止めた。クリップのクランプ力は2.5kgを適用した。
クリップで止めたサンプルを150℃に調整したホットプレート上に平置きにし、1分間加熱を行った。加熱1分後の様子をマイクロスコープ(nano. capture PRO、サイトロン製)にて画像を取り込み、画像処理ソフトImage-Jにより2値化処理を実施した。2値化処理後の画像を適用し、下記の式よりボイド率を算出し、以下の基準で評価した。なお、下記評価において、AおよびBを合格とする。
ボイド率(%)=空隙部の面積(mm2)/グリース直径10mmの面積(mm2)
B:ボイド率が3%以上6%未満
C:ボイド率が6%以上
拡散率測定装置(LFA467、ネッチ・ジャパン(株)製)を用いて、熱伝導率の測定を行った。直径12.7mmのアルミニウム製のカップ容器に、グリース組成物を入れ、直径9mmのアルミニウム製の蓋で覆い3層構成とした。グリース組成物の厚みは、350μm±50μmになるようグリース組成物を調整し、液状測定用ホルダーに設置した。キセノンフラッシュ法にて得られた熱拡散率に対し、補正処理を行い、アルミニウムの熱拡散率を除外した、界面熱抵抗を含む熱拡散率を得た。得られた界面熱抵抗を含む熱拡散率と、グリース組成物の密度、比熱を下記式(1)に導入し熱伝導率を算出し、冷熱サイクル試験前の熱伝導率とした。密度の測定は、高精度電子比重計(SD-200L、アルファーミラジュ(株)製)を使用して測定した。比熱測定は、示差走査熱量計(DSC-6200、セイコーインスツルメンツ(株)製)を使用して測定した。
熱伝導率(W/m・K)=熱拡散率(mm2/s)×密度(g/cm3)×比熱(J/(kg・K))・・・(1)
グリース組成物50gを50ccガラス管に入れ、-40~150℃、1000サイクルの設定条件にて冷熱サイクル試験機により冷熱サイクル試験を実施した。グリース組成物の、冷熱サイクル試験前の質量W1および該冷熱サイクル試験後の質量W2から質量減少率(変化率)を算出した。
Infineon製の半導体パワーモジュール部品(縦106mm×横61mm×厚み30mm、素子のTjMAX:150℃)は、該部品の金属ベース基板側にグリース組成物を厚み150μmとなるように塗布し、縦210mm×横60mm×厚み10mmの銅板に設置した。設置は、ねじ穴6点にねじを設置し、締め付けトルク200cN/cmにて固定した。半導体パワーモジュールを設置した銅板は縦置きにし、半導体パワーモジュールの端子に電圧を印加することで部品内部の素子が発熱した。電圧のON/OFF(保持時間:3秒間)を5000サイクル行い、5000サイクル後の熱抵抗を評価した。
2 放熱体
3 グリース組成物
4 基板
5 ネジ
10 電子部品
Claims (8)
- (A)液状樹脂、(B)ポリメタクリル酸系有機粒子、及び(C)無機充填材を含有し、
前記(A)液状樹脂が、ポリオール、ポリエーテル、及びジアミン樹脂から選ばれる少なくとも1種を含み、
前記(B)ポリメタクリル酸系有機粒子が、溶解度パラメーター(SP値)が7.8~10.1の有機溶剤に溶解することを特徴とするグリース組成物。 - 前記(B)ポリメタクリル酸系有機粒子の平均粒子径が0.1~10.0μmである請求項1に記載のグリース組成物。
- 前記(B)ポリメタクリル酸系有機粒子の平均重合度が1,000~50,000である請求項1又は2に記載のグリース組成物。
- 前記(B)ポリメタクリル酸系有機粒子が、ポリメタクリル酸アルキル粒子、ポリメタクリル酸アルキルエステル粒子、及びアクリル酸アルキル・メタクリル酸アルキル樹脂粒子から選ばれる少なくとも1種を含む請求項1~3のいずれか1項に記載のグリース組成物。
- 前記(A)液状樹脂がポリエーテルを含み、前記(A)液状樹脂中のポリエーテルの割合が50~95質量%である請求項1~4のいずれか1項に記載のグリース組成物。
- 前記(C)無機充填材が酸化アルミニウム粒子または窒化アルミニウム粒子を含む請求項1~5のいずれか1項に記載のグリース組成物。
- 加熱によりゲル化した請求項1~6のいずれか1項に記載のグリース組成物。
- 発熱体と、
放熱体と、
前記発熱体と前記放熱体との間に配置された請求項1~7のいずれか1項に記載のグリース組成物と、を有する電子部品。
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| JP2019167429A (ja) * | 2018-03-22 | 2019-10-03 | 帝人株式会社 | エポキシ樹脂組成物、プリプレグ、炭素繊維強化複合材料及びこれらの製造方法 |
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| US8222190B2 (en) * | 2009-08-19 | 2012-07-17 | Nanotek Instruments, Inc. | Nano graphene-modified lubricant |
| JP5735827B2 (ja) * | 2011-03-23 | 2015-06-17 | Jx日鉱日石エネルギー株式会社 | 粘度指数向上剤、潤滑油用添加剤および潤滑油組成物 |
| WO2015005384A1 (ja) * | 2013-07-12 | 2015-01-15 | 横浜ゴム株式会社 | ゴム組成物およびそれを用いた空気入りタイヤ |
| JP6362265B2 (ja) * | 2014-11-28 | 2018-07-25 | 株式会社Adeka | グリース用添加剤及びそれを含有するグリース組成物 |
| JP6669028B2 (ja) * | 2016-09-27 | 2020-03-18 | 信越化学工業株式会社 | 熱伝導性シリコーングリース組成物 |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN116390975B (zh) | 2025-04-22 |
| CN116390975A (zh) | 2023-07-04 |
| JPWO2022070335A1 (ja) | 2022-04-07 |
| US20230392008A1 (en) | 2023-12-07 |
| EP4223843A4 (en) | 2024-07-03 |
| JP7496426B2 (ja) | 2024-06-06 |
| EP4223843A1 (en) | 2023-08-09 |
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