WO2015059950A1 - ポリイミド樹脂組成物、及びそれを用いた熱伝導性接着フィルム - Google Patents
ポリイミド樹脂組成物、及びそれを用いた熱伝導性接着フィルム Download PDFInfo
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- WO2015059950A1 WO2015059950A1 PCT/JP2014/064393 JP2014064393W WO2015059950A1 WO 2015059950 A1 WO2015059950 A1 WO 2015059950A1 JP 2014064393 W JP2014064393 W JP 2014064393W WO 2015059950 A1 WO2015059950 A1 WO 2015059950A1
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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
- 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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1039—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors comprising halogen-containing substituents
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1042—Copolyimides derived from at least two different tetracarboxylic compounds or two different diamino compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1057—Polyimides containing other atoms than carbon, hydrogen, nitrogen or oxygen in the main chain
- C08G73/1064—Polyimides containing other atoms than carbon, hydrogen, nitrogen or oxygen in the main chain containing sulfur
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
- C08G73/1071—Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain
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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
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
- C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D179/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09D161/00 - C09D177/00
- C09D179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09D179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- 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
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
-
- 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
- C09J179/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09J161/00 - C09J177/00
- C09J179/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C09J179/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- 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
- H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
Definitions
- the present invention is a phenolic hydroxyl group-containing aromatic polyimide that can be suitably used as a silicon carbide-based power module that requires heat resistance, high heat dissipation, and sufficient insulation, when it is used as a thermally conductive adhesive film.
- the present invention relates to a resin composition containing a resin and an epoxy resin having a melt viscosity of 0.04 Pa ⁇ s or less, a thermally conductive adhesive film using the same, a laminate having a cured layer of the resin composition, and an electronic component.
- a power module mounted with power devices such as high power diodes, transistors and ICs is used.
- the power module is required to have sufficient heat dissipation to release the heat generated from the power element and high electrical insulation (electrical reliability) under high temperature.
- heat conductive adhesive films are used in order to join a power module and a heat sink, that is, a heat transfer member for radiating heat, in order to provide sufficient heat dissipation.
- These heat conductive films have high thermal conductivity such as silver, copper, gold, aluminum, metals, alloys, compounds, or electrical insulating properties such as aluminum oxide, silicon nitride, silicon carbide, etc. in order to enhance the thermal conductivity.
- a thermally conductive filler in the form of particles or fibers such as ceramics, carbon black, graphite and diamond is blended.
- a resin composition consisting of a ring-closing polyimide containing an ether bond in the skeleton and a thermally conductive inorganic filler can be designed to have a low glass transition temperature, so when it is used to form a film, a low temperature of about 170 to 200 ° C. It is known that it can be bonded to an adherend and can be suitably used as a heat conductive adhesive film (Patent Document 1).
- silicon carbide power semiconductors that can be smaller, consume less power, and have higher efficiencies than silicon semiconductors, and have excellent switching characteristics and operating characteristics under high temperature environments are expected as next-generation low-loss power devices It is done.
- the temperature range in which the peripheral members are used rises to around 200 degrees, so that the cured layer after bonding is required to have heat resistance of 200 ° C. or higher .
- Patent Document 1 can not be used as a thermally conductive adhesive film for bonding a silicon carbide power module because the glass transition temperature of a cured film after adhesive lamination is below 200 ° C.
- a resin composition comprising a phenolic hydroxyl group-containing aromatic polyamide resin and a thermally conductive inorganic filler is capable of adhering to an adherend at a low temperature of about 170 to 200 ° C. when it is used as a film.
- a silicon carbide power module Patent Document 2
- high electrical insulation for example, about 6 KV or more
- thermal conductivity for example, 10 W / m ⁇ K or more
- Patent Document 3 resin compositions of aromatic polyimide resins and epoxy resins containing ether bonds in the skeleton and containing phenolic hydroxyl groups are known.
- the epoxy resin there is no limitation on the epoxy resin to be used, and in the example, one having a melt viscosity of higher than 0.04 Pa ⁇ s is used, and its application is a binder for non-aqueous battery electrodes, and for silicon carbide power modules Is not known.
- An object of the present invention is a resin composition
- a resin composition comprising an aromatic polyimide resin containing an phenolic hydroxyl group, an epoxy resin, and a thermally conductive inorganic filler, wherein a low temperature (specifically good) is obtained when the thermally conductive adhesive film is used. It exhibits adhesiveness (for example, about 6 N / cm), electrical insulation (for example, about 6 KV or more), and thermal conductivity (for example, 10 W / m ⁇ K or more) at about 170 to 200 ° C., and heat resistance after curing It is an object of the present invention to provide a resin composition having a good (for example, a glass transition temperature of 200 ° C. or more).
- the inventors of the present invention conducted intensive studies to solve the above problems, and as a result, aromatic polyimide resins containing phenolic hydroxyl groups, epoxy resins having a melt viscosity of 0.04 Pa ⁇ s or less, inorganic fillers, in particular It has been found that the object of the present invention can be achieved by using a resin composition containing a thermally conductive inorganic filler.
- the present invention (A) An aromatic polyimide resin (A) containing a phenolic hydroxyl group, a filler (B), and an epoxy resin (C) having a melt viscosity of 0.04 Pa ⁇ s or less, and a polyimide resin (A),
- the aromatic polyimide resin (A) containing a phenolic hydroxyl group is represented by the following formula (1): (Wherein, m and n are average values, a positive number satisfying the relationship of 0.005 ⁇ n / (m + n) ⁇ 0.14 and 0 ⁇ m + n ⁇ 200, and R 1 has an ether bond) And a tetravalent aromatic group having no phenolic hydroxyl group, R 2 is
- the resin composition of the present invention when formed into a film, can be adhered to an adherend at a low temperature of about 170 to 200 ° C., and the glass transition temperature of the cured layer after adhesion lamination is 200 ° C. Exceed. Furthermore, since it exhibits specifically good electrical insulation and high thermal conductivity (heat dissipation), it is suitable as a thermally conductive adhesive film for silicon carbide based power modules. Furthermore, the varnish containing the resin composition of the present invention is thermally conductive by being impregnated into a coil used in other applications requiring heat dissipation (thermal conductivity), for example, a power device such as a motor, and dried. It is preferably used also for the use used as a heat-resistant heat-resistant covering material, and the conductive bonding material use between circuit wiring and electronic parts in the mounting process of electronic parts (use as a substitute for solder bonding).
- the phenolic hydroxyl group-containing aromatic polyimide resin (A) contained in the resin composition of the present invention preferably has an ether bond in its skeleton, and more preferably one in which ether bonds are bonded to the meta position of the aromatic ring .
- a phenolic hydroxyl group-containing aromatic polyimide resin having a repeating unit represented by the following formula (1) in the structure is more preferable.
- R 1 is the following formula (2):
- Represents a tetravalent aromatic group represented by R 2 is the following formula (3):
- Represents a divalent aromatic group represented by R 3 is the following formula (4):
- the phenolic hydroxyl group-containing aromatic polyimide resin (A) which has a repeating unit in a structure which is one or more types of bivalent aromatic groups chosen from is obtained.
- the molar ratio of the diamine compound to the diaminodiphenol compound used in the above reaction is preferably 0.005 ⁇ n / (m + n) ⁇ 0.14 and 0 ⁇ m + n ⁇ 200. .
- the hydroxyl equivalent of the phenolic hydroxyl group derived from the aromatic group R 3 in one molecule of the polyimide resin (A) and the molecular weight exert the effects of the present invention It will be an appropriate value. More preferably, 0.01 ⁇ n / (m + n) ⁇ 0.06, and still more preferably 0.015 ⁇ n / (m + n) ⁇ 0.04.
- the glass transition temperature of the cured film after bonding falls below 200 ° C. if 0.005> n / (m + n). It is not preferable that n / (m + n)> 0.14, since the electrical insulation property is deteriorated.
- the average molecular weight of the polyimide resin (A) of the present invention is preferably 1,000 to 70,000 in number average molecular weight and 5,000 to 500,000 in weight average molecular weight.
- the average molecular weight is less than this value, the mechanical strength required when forming the thermally conductive adhesive film is less likely to be developed, and when the average molecular weight exceeds this value, when the thermally conductive adhesive film is formed Necessary adhesion becomes difficult to develop.
- the terminal of the polyimide resin (A) becomes an acid anhydride, and when it exceeds, the terminal becomes an amine.
- the terminal of the polyimide resin (A) of the present invention is not limited to either structure, but is preferably a terminal amine.
- the addition reaction and the dehydration ring closure reaction can be carried out by using a solvent that dissolves the synthetic intermediate polyamic acid and the polyimide resin (A) of the present invention, such as N-methyl-2-pyrrolidone, N, N-dimethylacetamide, and ⁇ It is preferable to carry out in a solvent containing one or more selected from-butyrolactone.
- a solvent that dissolves the synthetic intermediate polyamic acid and the polyimide resin (A) of the present invention such as N-methyl-2-pyrrolidone, N, N-dimethylacetamide, and ⁇ It is preferable to carry out in a solvent containing one or more selected from-butyrolactone.
- a small amount of a relatively low boiling nonpolar solvent such as toluene, xylene, hexane, cyclohexane or heptane is used as a dehydrating agent, and water by-produced in the reaction is removed from the reaction system It is preferable to carry out. It is also preferable to add a small amount of a basic organic compound selected from pyridine, N, N-dimethyl-4-aminopyridine and triethylamine as a catalyst.
- the reaction temperature during the addition reaction is usually 10 to 100 ° C., preferably 40 to 90 ° C.
- the reaction temperature during the dehydration ring closure reaction is usually 150 to 220 ° C., preferably 160 to 200 ° C., and the reaction time is usually 2 to 15 hours, preferably 5 to 10 hours.
- the amount of dehydrating agent added is usually 5 to 20% by mass with respect to the reaction solution, and the amount of catalyst added is usually 0.1 to 5% by mass with respect to the reaction solution.
- the polyimide resin (A) used in the present invention is preferably one that dissolves in a solvent, and is obtained as a varnish of the polyimide resin (A) of the present invention dissolved in a solvent after dehydration ring closure reaction.
- the solvent for example, N-methyl-2-pyrrolidone, N, N-dimethylacetamide or ⁇ -butyrolactone is preferable.
- dissolves also in any 1 or more types of the solvent used for the varnish of the following resin composition is preferable.
- a method of adding a poor solvent such as water or alcohol to the obtained varnish of the polyimide resin (A) of the present invention to precipitate the polyimide resin (A) and purifying it for use Be
- the varnish of the polyimide resin (A) of the present invention obtained after the dehydration ring closure reaction can be used as it is without purification, and this embodiment is more preferable from the viewpoint of operability.
- the filler (B) and an additive such as an epoxy resin (C) having a melt viscosity of 0.04 Pa ⁇ s or less are added to the polyimide resin (A) thus obtained.
- a resin composition can be obtained.
- an inorganic filler particularly a thermally conductive inorganic filler is preferably used.
- the thermal conductivity measured by the laser flash method is preferably 1 W / m ⁇ k or more, more preferably 5 W / m ⁇ k or more, and still more preferably 10 W / m ⁇ k or more.
- Specific examples of the filler (B) include aluminum hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, calcium silicate, calcium oxide, magnesium oxide, magnesium oxide, alumina, aluminum nitride, aluminum borate whiskers, silicon nitride, boron nitride, Crystalline silica, amorphous silica, silicon carbide can be mentioned.
- alumina, aluminum nitride, silicon nitride, boron nitride, crystalline silica, amorphous silica, and silicon carbide are preferable.
- the filler (B) it is more preferable to use at least one selected from aluminum nitride and boron nitride as the filler (B) from the viewpoint of obtaining high thermal conductivity.
- the average particle diameter of the secondary aggregation particles is preferably about 10 to 50 ⁇ m, and more preferably about 15 to 40 ⁇ m. Therefore, when using large secondary aggregation particle boron nitride as a raw material, the size of secondary aggregation particle of boron nitride appropriately dispersed in the resin composition of the present invention is appropriately crushed or the like so as to fall within the above range. It is preferable to adjust.
- the particle size of boron nitride may be adjusted in advance by stirring and mixing, or secondary particles may be adjusted together with mixing when mixing with stirring or kneading with other raw materials.
- microcrystals of about 0.6 ⁇ m are also aggregated to form secondary agglomerated fine particles of about 1 to 2 ⁇ m, so they can be used as they are.
- the average particle size may be measured by sampling the liquid in stirring and mixing. The measurement of the average particle size can be performed with a grind gauge (particle size gauge) or a laser diffraction particle size distribution measuring apparatus.
- the resin composition of the present invention can make the glass transition temperature of the cured layer after adhesive lamination when forming a heat conductive adhesive film be 200 ° C. or higher. Furthermore, by setting the epoxy resin to an epoxy resin (C) having a melt viscosity of 0.04 Pa ⁇ s or less, the effect of the present invention is specifically good electrical insulation, thermal conductivity, good at low temperature Adhesiveness can be expressed. In the present invention, the melt viscosity of the epoxy resin is measured at 150 ° C. using a cone-plate viscometer.
- epoxy resin (C) having a melt viscosity of 0.04 Pa ⁇ s or less which is blended into the resin composition of the present invention, include bisphenol A epoxy resin (for example, JER 828 (manufactured by Mitsubishi Chemical Corporation), EP 4100) (Made by ADEKA Co., Ltd.), 850-S (made by DIC Corporation), RE-310S (made by Nippon Kayaku Co., Ltd.), Guatemala resin BEO-60E (made by Shin Nippon Rika Co., Ltd.) bisphenol F type epoxy resin (For example, YDF-870GS (manufactured by Nippon Steel Sumikin Chemical Co., Ltd.), RE-303S (manufactured by Nippon Kayaku Co., Ltd.)), biphenol skeleton epoxy resin or alkyl biphenol skeleton epoxy resin (eg, YX-4000 (Mitsubishi Chemical Co., Ltd., YL6121H (Mitsubishi Chemical Co., Ltd.), etc., but not
- the epoxy resin whose melt viscosity exceeds 0.04 Pa.s can be mix
- Specific examples of such epoxy resin include novolac epoxy resin (for example, N-660 (manufactured by DIC Corporation), YDCN-700-5 (manufactured by Nippon Steel Sumikin Chemical Co., Ltd.), EOCN-1020 (manufactured by Nippon Kayaku) Medicine (manufactured by Nippon Kayaku Co., Ltd.) EPPN-501H (manufactured by Nippon Kayaku Co., Ltd.), dicyclopentadiene-phenol condensation epoxy resin (for example, XD-1000 (manufactured by Nippon Kayaku Co., Ltd.)), xylylene skeleton-containing phenol Novolak epoxy resin (for example, NC-2000 (manufactured by Nippon Kayaku Co., Ltd.)), biphen
- Polyimide resin as a measure of the amount of epoxy resin exceeding 0.04 Pa ⁇ s
- the sum of the mass of (A) and the epoxy resin (C) having a melt viscosity of 0.04 Pa ⁇ s or less is 100 parts, it is preferably 50 parts or less, more preferably 40 parts or less, and 20 More preferably, it is not more than part.
- additives for expressing various physical properties can be blended.
- epoxy resin curing agent examples include diaminodiphenylmethane, diethylenetriamine, triethylenetetramine, diaminodiphenylsulfone, isophorone diamine, dicyandiamide, a polyamide resin synthesized from a dimer of linolenic acid and ethylene diamine, phthalic anhydride, trimellitic anhydride Acids, pyromellitic anhydride, maleic anhydride, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, methyl nadic anhydride, hexahydrophthalic anhydride, polyhydric phenol compounds such as methylhexahydrophthalic anhydride, phenol novolac, triphenyl Methane and modified products thereof, imidazole, BF 3 -amine complex, guanidine derivative and the like can be mentioned, but it is not limited thereto. It can be selected as appropriate depending on the mode of use.
- a polyhydric phenol compound is used, preferably a phenol novolac obtained by condensation reaction of phenol, formaldehyde and benzene or biphenyl.
- an epoxy resin curing agent when compounded, it depends on the curing agent used in combination, so it can not be generally said, but the curing agent is preferably 500 parts by mass or less, more preferably 100 parts by mass with respect to 100 parts by mass of the total epoxy resin. It is below. When it is more than this, the heat resistance of the heat conductive adhesive film may be reduced.
- the resin composition of the present invention at the time of curing reaction, all phenolic hydroxyl groups in the polyimide (A) and hydroxyl groups or amino groups in the curing agent as an optional component, and all contained in the composition The epoxy groups of the epoxy resin react stoichiometrically.
- the number of moles of epoxy group is preferably 1.0 times or more of the sum of the number of moles of hydroxyl group or amino group in the phenolic hydroxyl group and the curing agent as an optional component, more preferably Is 1.05 times or more, more preferably 1.2 times or more.
- the molar number of the phenolic hydroxyl group in the polyimide (A), the molar number of the hydroxyl group or amino group in the curing agent as an optional component, and the molar number of the epoxy group of the epoxy resin are each divided by mass of functional group equivalent It can be calculated by
- curing accelerator examples include 2-methylimidazole, 2-ethylimidazole, 2-ethyl-4-methylimidazole, 2-phenyl-4,5-dihydroxymethylimidazole, 2- Imidazoles such as phenyl-4-methyl-5-hydroxymethylimidazole and 2-phenylimidazole, 2,4-diamino-6- [2'-undecylimidazolyl- (1 ')]-ethyl-s-triazine Triazines such as 2,4-diamino-6- [2′-methylimidazolyl- (1 ′)]-ethyl-s-triazine, 2- (dimethylaminomethyl) phenol, 1,8-diaza-bicyclo (5 , 4,0) Tertiary amines such as undecene-7, phosphines such as triphenylphosphine, and metal compounds such as tin oc
- Additives such as a coupling agent, an organic solvent, an ion scavenger and the like may be added to the resin composition of the present invention as required.
- the coupling agent to be used is not particularly limited, but a silane coupling agent is preferable, and specific examples thereof include ⁇ -glycidoxypropyltrimethoxysilane, ⁇ -mercaptopropyltrimethoxysilane, ⁇ -aminopropyltriethoxysilane, and ⁇ Ureidopropyltriethoxysilane, N- ⁇ -aminoethyl- ⁇ -aminopropyltrimethoxysilane and the like.
- the amount of the coupling agent used may be selected according to the application of the resin composition, the type of the coupling agent, etc., and is usually 5 parts by mass or less in 100 parts by mass of the resin composition of the present invention.
- the ion scavenger which can be used in the resin composition of the present invention is not particularly limited.
- a triazine thiol compound known as a copper inhibitor to prevent copper from ionizing and dissolving and 2,2'-methylene And bisphenol-based reducing agents such as bis- (4-methyl-6-tert-butylphenol), zirconium-based compounds as inorganic ion adsorbents, antimony bismuth-based compounds, magnesium aluminum-based compounds, and hydrotalcites.
- ion scavengers ionic impurities can be adsorbed to improve the electric reliability at the time of moisture absorption.
- the amount of the ion scavenger used is usually 5% by mass or less in the resin composition of the present invention in consideration of the effects, heat resistance, cost and the like.
- the resin composition of the present invention can also be used as a varnish dissolved in an organic solvent.
- organic solvent which can be used include lactones such as ⁇ -butyrolactone, N-methylpyrrolidone (NMP), N, N-dimethylformamide (DMF), N, N-dimethylacetamide and N, N-dimethylimidazolidinone
- Amide solvents such as tetramethylene sulfone, sulfones such as tetramethylene sulfone, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, propylene glycol, propylene glycol monomethyl ether, ether solvents such as propylene glycol monomethyl ether monoacetate and propylene glycol monobutyl ether, acetone, methyl ethyl ketone, Ketone solvents such as methyl isobutyl ketone, cyclopentanone and cyclohexanone, aromatic solvents such as to
- Two or more organic solvents may be mixed and used.
- a mixed solvent of a high boiling point solvent and a low boiling point solvent such as ⁇ -butyrolactone (boiling point: 204 ° C.) and methyl ethyl ketone (boiling point: 79.6 ° C.) are preferably used.
- the amount of the organic solvent used is usually 90% by mass or less, preferably 70% by mass or less, more preferably 50% by mass or less in the varnish of the present invention.
- the varnish of the present invention is preferably used in the heat conductive adhesive film of the present invention through the coating and drying steps, as well as in other applications where thermal conductivity is required.
- it is used as a heat conductive heat-resistant coating material by impregnating a coil used in a power device such as a motor and drying it, and a conductive bonding material between circuit wiring and the electronic component in the mounting process of the electronic component
- the application (application as a substitute for solder bonding) is given as a specific example.
- conductive particles such as silver powder and copper powder are blended in the resin composition in addition to the thermal conductivity filler.
- the varnish can be produced by using a grinder, 3-roll, bead mill or the like, or a combination thereof, in consideration of the dispersion of the thermally conductive filler. Moreover, after mixing a heat conductive filler and a low molecular weight component beforehand, it becomes possible to shorten the time which mixing requires by mix
- the resin composition of the present invention can be formed into a thermally conductive adhesive film of the present invention by applying the varnish to a substrate and then drying the organic solvent to form a film.
- a base material used at the time of film formation a polyethylene terephthalate film, a polyethylene film, a polypropylene film, a polyester film, a fluorine film, copper foil, stainless steel foil, etc. are suitable.
- the surface of the substrate may be release-treated with silicone or the like.
- a varnish of the resin composition of the present invention is applied to the surface of a substrate by a comma coater, a die coater, a gravure coater or the like, and the curing reaction does not proceed by hot air or an infrared heater etc. By evaporating the solvent and peeling it from the substrate, a film comprising the resin composition of the present invention can be obtained.
- the base material used here as an adherend of the resin composition of this invention as it is it is not necessary to peel a base material, after volatilizing a solvent.
- the thickness of the heat conductive adhesive film of the present invention is usually 2 to 500 ⁇ m, preferably 5 to 300 ⁇ m.
- the thickness of the film is too thin, the adhesion strength with the adherend decreases significantly, and when the thickness of the film is too thick, the solvent remaining in the film increases, and the environmental test for the adherend with the adherend When you do, problems such as floating and swelling occur.
- the application of the thermally conductive adhesive film of the present invention is not particularly limited, but from the effects such as heat resistance, high thermal conductivity (heat dissipation), adhesiveness and electrical insulation properties, heat dissipation from electric circuits, metal foils or circuit boards It is preferably used to bond a plate.
- the material of the metal foil is not particularly limited, but in terms of versatility, copper foil, aluminum foil or stainless steel foil is preferable.
- the heat conductive adhesive film of the present invention is also preferably used to bond a cooler and a power module such as, for example, a silicon carbide power module.
- the power module is one in which a plurality of power elements (power MOSFETs, IGBTs, etc.) are connected to a ceramic substrate or the like and incorporated in one package.
- power elements power MOSFETs, IGBTs, etc.
- the cooler may be one that can cool the power module by heat exchange, and may be water-cooled or air-cooled.
- Direct bonding of the cooler to both sides of the type of power module capable of radiating heat from both sides via the cured layer of the thermally conductive adhesive film of the present invention is one of the preferable applications of the thermally conductive adhesive film of the present invention It can be mentioned as
- the heat sink here is a plate laminated on the surface on which the electronic component is mounted for the purpose of promoting heat radiation from the electronic component mounted in the electric circuit, and a metal plate or the like is usually used. Ru.
- the material of the heat sink include metals such as copper, aluminum, stainless steel, nickel, iron, gold, silver, molybdenum and tungsten, composites of metal and glass, and alloys, among which copper having high thermal conductivity. Aluminum, gold, silver or iron, and alloys using these are preferable.
- the thickness of the heat sink is not particularly limited, but is usually 0.1 to 5 mm from the viewpoint of processability.
- the resin composition of the present invention is applied as a varnish to these heat sinks or metal foils, and the varnish is dried, or the above-mentioned single adhesive film is laminated to form a heat conduction consisting of the resin composition of the present invention
- the heat conductive adhesive film-attached metal foil comprising the heat-dissipation plate with the adhesive film and the resin composition of the present invention is obtained.
- Heat sink with heat conductive adhesive film and metal foil comprising the resin composition of the present invention, or metal foil with heat conductive adhesive film and heat sink comprising the resin composition of the present invention, or heat sink and sole material of the present invention
- a laminate comprising a metal foil, a cured layer of the resin composition of the present invention, and a heat sink is obtained by overlapping the heat conductive adhesive film and the metal foil and heating and pressure bonding with a hot plate press or hot roll press.
- the electronic component of the present invention can be obtained, for example, by overlapping a power module, the thermally conductive adhesive film of the present invention, and a cooler and heat-pressing them with a hot plate press or a hot roll press.
- the electronic component of the present invention is not limited to the above configuration.
- the temperature for thermocompression bonding is preferably 170 ° C. to 200 ° C. at which a heat roll press with high production efficiency can be used, and the press pressure is preferably 0.5 MPa to 15 MPa.
- An electric circuit, a cured layer of the resin composition of the present invention, and a heat sink are laminated by performing circuit processing on the metal foil portion of the laminate comprising the metal foil, the cured layer of the resin composition of the present invention, and the heat sink. Can be created. Moreover, mounting of the electronic component to an electric circuit is performed by solder connection etc., and it becomes an electronic component which has a cured layer of the resin composition of this invention.
- m and n in Formula (1) can be calculated using following formula (a) and (b).
- M and N each represent the number of moles of diamine and diaminodiphenol having no phenolic hydroxyl group used in the reaction.
- m + n 100 / (100R-100)
- n / (m + n) N / (M + N)
- Synthesis example 1 APB-N (1,3-bis- (3-aminophenoxy) as a diamine compound in a 500 ml reactor equipped with a thermometer, reflux condenser, Dean Stark apparatus, powder inlet, nitrogen introduction apparatus and stirrer. Benzene, 30.79 parts (0.105 mol) of Mitsui Chemicals, Inc., molecular weight 292.33) and ABPS (3,3'-diamino-4,4'-dihydroxydiphenyl sulfone as a diaminophenol compound, Nippon Kayaku Co., Ltd.
- Synthesis example 2 APB-N (1,3-bis- (3-aminophenoxy) as a diamine compound in a 500 ml reactor equipped with a thermometer, reflux condenser, Dean Stark apparatus, powder inlet, nitrogen introduction apparatus and stirrer. Benzene, 30.63 parts (0.105 mol) of Mitsui Chemicals, Inc., molecular weight 292.33) and ABPS (3,3'-diamino-4,4'-dihydroxydiphenyl sulfone as a diaminophenol compound, Nippon Kayaku Co., Ltd.
- Synthesis example 3 APB-N (1,3-bis- (3-aminophenoxy) as a diamine compound in a 500 ml reactor equipped with a thermometer, reflux condenser, Dean Stark apparatus, powder inlet, nitrogen introduction apparatus and stirrer.
- Benzene made by Mitsui Chemicals, Inc., 30.31 parts (0.104 mol) of molecular weight 292.33) and ABPS (3,3'-diamino-4,4'-dihydroxydiphenyl sulfone as a diaminophenol compound, Nippon Kayaku Co., Ltd.
- the ring closure reaction was performed by heating at 180 ° C. for 3 hours while removing water generated by the imidization reaction using a Dean-Stark apparatus, and heating was further performed for 4 hours to remove pyridine and toluene.
- the reaction solution cooled to 80 ° C. or less is subjected to pressure filtration using a Teflon (registered trademark) filter with a pore size of 3 ⁇ m to obtain the following formula (8): 200 parts of polyimide resin varnish of this invention which contains 30% of polyimide resin (A) of this invention represented by these is obtained.
- the number average molecular weight determined in terms of polystyrene based on the measurement results of gel permeation chromatography of the polyimide resin (A) of the present invention in a polyimide resin varnish is 42,000, and the weight average molecular weight is 110,000.
- the value of m in Formula (8) calculated from the molar ratio of each component used by reaction was 48.00, and the value of n was 2.00.
- the R value was 1.02.
- Synthesis example 5 APB-N (1,3-bis- (3-aminophenoxy) as a diamine compound in a 500 ml reactor equipped with a thermometer, reflux condenser, Dean Stark apparatus, powder inlet, nitrogen introduction apparatus and stirrer.
- tetracarboxylic acid dianhydride 32.44 parts (0.105 mol) of ODPA (4,4'-oxydiphthalic anhydride, manufactured by Manac Corporation, molecular weight 310.22), ⁇ -butyrolactone 71 as a solvent are used. 19 parts, 1.66 parts of pyridine as a catalyst and 28.49 parts of toluene as a dehydrating agent were added, and the temperature in the reactor was raised to 180 ° C. The ring closure reaction was performed by heating at 180 ° C. for 3 hours while removing water generated by the imidization reaction using a Dean-Stark apparatus, and heating was further performed for 4 hours to remove pyridine and toluene.
- the reaction solution cooled to 80 ° C. or less is subjected to pressure filtration using a Teflon (registered trademark) filter with a pore size of 3 ⁇ m to obtain the following formula (9): 200 parts of polyimide resin varnish of this invention which contains 30% of polyimide resin (A) of this invention represented by these is obtained.
- the number average molecular weight determined in terms of polystyrene based on the measurement results of gel permeation chromatography of the polyimide resin (A) of the present invention in a polyimide resin varnish is 40,000, and the weight average molecular weight is 100,000.
- the value of m in Formula (9) calculated from the molar ratio of each component used by reaction was 48.96, and the value of n was 1.04.
- the R value was 1.02.
- Synthesis example 6 APB-N (1,3-bis- (3-aminophenoxy) as a diamine compound in a 500 ml reactor equipped with a thermometer, reflux condenser, Dean Stark apparatus, powder inlet, nitrogen introduction apparatus and stirrer. Benzene, 30.70 parts (0.105 mol) of Mitsui Chemicals, Inc., molecular weight 292.33, and HAB (3,3'-diaminobiphenyl-4,4'-diol as a diaminodiphenol compound, Nippon Kayaku Co., Ltd.
- tetracarboxylic acid dianhydride 32.53 parts (0.105 mol) of ODPA (4,4′-oxydiphthalic anhydride, manufactured by Manac Corporation, molecular weight 310.22), ⁇ -butyrolactone 71 as a solvent is used.
- 37 parts, 1.66 parts of pyridine as a catalyst and 28.49 parts of toluene as a dehydrating agent were added, and the temperature in the reactor was raised to 180 ° C.
- the ring closure reaction was performed by heating at 180 ° C. for 3 hours while removing water generated by the imidization reaction using a Dean-Stark apparatus, and heating was further performed for 4 hours to remove pyridine and toluene.
- reaction solution cooled to 80 ° C. or less is subjected to pressure filtration using a Teflon (registered trademark) filter with a pore size of 3 ⁇ m to obtain the following formula (11): 200 parts of polyimide resin varnish of this invention which contains 30% of polyimide resin (A) of this invention represented by these is obtained.
- Teflon registered trademark
- the number average molecular weight determined in terms of polystyrene based on the measurement result of gel permeation chromatography of the polyimide resin (A) of the present invention in a polyimide resin varnish is 22,000, and the weight average molecular weight is 77,000,
- the value of m in Formula (11) calculated from the molar ratio of each component used by reaction was 50.00, and the value of n was 0.
- the R value was 1.02.
- Synthesis Example 9 (synthesis of phenolic hydroxyl group-containing aromatic polyamide resin for comparison) 3.64 parts (0.02 moles) of 5-hydroxyisophthalic acid and 162.8 parts (0.98 parts) of isophthalic acid while nitrogen purging is performed on a flask equipped with a thermometer, a condenser, a fractionation pipe and a stirrer. Mol), 204.24 parts (102 mol) of 3,4'-diaminodiphenyl ether, 10.68 parts of lithium chloride, 1105 parts of N-methylpyrrolidone and 236.28 parts of pyridine, and the mixture is stirred and dissolved, and then phosphorous acid is added.
- a reaction liquid containing a phenolic hydroxyl group-containing aromatic polyamide resin was obtained by adding 512.07 parts of triphenyl and causing a condensation reaction at 95 ° C. for 4 hours. While the reaction mixture was stirred, 670 parts of water was added dropwise over 3 hours at 90 ° C., and the mixture was further stirred at 90 ° C. for 1 hour. After cooling to 60 ° C. and leaving for 30 minutes, the upper layer was separated into an aqueous layer and the lower layer was separated into an oil layer (resin layer), so the upper layer was removed by decantation. The amount of the upper layer removed was 1200 parts.
- the wet cake of the obtained precipitate was dispersed in 2700 parts of methanol and refluxed under stirring for 2 hours. Next, methanol is separated by filtration, and the precipitate collected by filtration is washed with 3300 parts of water and then dried to obtain the following formula (12): And 332 parts of a phenolic hydroxyl group-containing aromatic polyamide resin having a repeating unit represented by To 60 parts of the obtained phenolic hydroxyl group-containing aromatic polyamide resin was added 140 parts of ⁇ -butyrolactone to obtain 200 parts of a comparative polyamide resin varnish containing 30% of the phenolic hydroxyl group-containing aromatic polyamide resin. The number average molecular weight of the comparative polyamide resin was 44,000, and the weight average molecular weight was 106,000. The R value was 1.02.
- Example 1 RE-602S (bisphenol F type epoxy) having a melt viscosity of 0.003 Pa ⁇ s as an epoxy resin (C) relative to 100 parts of a varnish containing 30% of the polyimide resin (A) of the present invention obtained in Synthesis Example 1 16 parts of resin, Nippon Kayaku Co., Ltd., epoxy equivalent 188 g / eq, GPH-65 (biphenyl phenol condensation type novolak resin, Nippon Kayaku Co., Ltd., hydroxyl equivalent 200 g / eq as epoxy resin curing agent) 4 parts, 0.3 parts of 2-phenyl-4,5-dihydroxymethylimidazole (2PHZ) as a curing accelerator, 33 parts of ⁇ -butyrolactone as a solvent, and stirring at 30 ° C.
- 2-phenyl-4,5-dihydroxymethylimidazole (2PHZ) as a curing accelerator
- ⁇ -butyrolactone as a solvent
- Example 2 A resin composition (2) of the present invention was prepared by conducting the same experiment as in Example 1 except that the polyimide resin varnish used was a varnish containing 30% of the polyimide resin (A) obtained in Synthesis Example 2. Obtained.
- Example 3 A resin composition (3) varnish of the present invention was prepared by conducting the same experiment as in Example 1 except that the polyimide resin varnish used was a varnish containing 30% of the polyimide resin (A) obtained in Synthesis Example 3. Obtained.
- Example 4 A resin composition (4) varnish of the present invention was prepared by conducting the same experiment as in Example 1 except that the polyimide resin varnish used was a varnish containing 30% of the polyimide resin (A) obtained in Synthesis Example 4. Obtained.
- Example 5 A resin composition (5) of the present invention was prepared by conducting the same experiment as in Example 1 except that the polyimide resin varnish used was a varnish containing 30% of the polyimide resin (A) obtained in Synthesis Example 5. Obtained.
- Example 6 A resin composition (6) of the present invention was prepared by conducting the same experiment as in Example 1 except that the polyimide resin varnish used was a varnish containing 30% of the polyimide resin (A) obtained in Synthesis Example 6. Obtained.
- Example 7 The same experiment as in Example 1 was carried out except that the epoxy resin used was changed to YX4000 (alkyl biphenols skeleton epoxy resin, manufactured by Mitsubishi Chemical Corporation, epoxy equivalent weight 186 g / eq) having a melt viscosity of 0.02 Pa ⁇ s, The resin composition (7) varnish of the present invention was obtained.
- Example 8 RE-602S (bisphenol F type epoxy) having a melt viscosity of 0.003 Pa ⁇ s as an epoxy resin (C) relative to 100 parts of a varnish containing 30% of the polyimide resin (A) of the present invention obtained in Synthesis Example 1 30 parts of resin, Nippon Kayaku Co., Ltd., epoxy equivalent 188 g / eq, GPH-65 (biphenyl phenol condensation type novolak resin, Nippon Kayaku Co., Ltd., hydroxyl equivalent 200 g / eq as epoxy resin curing agent) (5 parts), 0.4 parts of 2-phenyl-4,5-dihydroxymethylimidazole (2PHZ) as a curing accelerator, 65 parts of ⁇ -butyrolactone as a solvent, and stirring at 30 ° C.
- resin Nippon Kayaku Co., Ltd., epoxy equivalent 188 g / eq
- GPH-65 biphenyl phenol condensation type novolak resin, Nippon Kayaku Co., Ltd
- Comparative example 3 An experiment was conducted in the same manner as in Example 1 except that the polyimide resin varnish used was a varnish containing 30% of the phenolic hydroxyl group-containing aromatic polyamide resin for comparison obtained in Synthesis Example 9, and a resin composition for comparison (11) Obtained a varnish.
- Comparative example 4 Comparative epoxy resin NC- having a melt viscosity of 0.06 Pa ⁇ s as the epoxy resin (C) relative to 100 parts of a varnish containing 30% of the comparative phenolic hydroxyl group-containing aromatic polyamide resin obtained in Synthesis Example 9 Three parts of 3000 (biphenyl skeleton-containing novolac epoxy resin, manufactured by Nippon Kayaku Co., Ltd., epoxy equivalent: 188 g / eq), in addition GPH-65 (biphenyl phenol condensation type novolac resin, Nippon Kayaku Co., Ltd.
- epoxy resin curing agent Add 0.75g of hydroxyl equivalent 200g / eq), 0.3 parts of 2-phenyl-4,5-dihydroxymethylimidazole (2PHZ) as a curing accelerator, and 6 parts of ⁇ -butyrolactone as a solvent. By stirring at 30 ° C. for 2 hours, the concentration of the sum of polyamide resin (A ′ ′) and epoxy resin (C) is increased.
- a mixed solution of 30% was obtained: 50 parts of the mixed solution (15 parts by mass of the sum of the polyamide resin (A ′ ′) and the epoxy resin (C)) was boron nitride (filler) as a filler (B) 45 parts (300% of resin solid content) of Mizushima Alloy Iron Co., Ltd. thermal conductivity 50 W / mK were added and kneaded with a three-roll mill to obtain a resin composition (12) varnish for comparison.
- Comparative example 5 Example except that the epoxy resin used is a comparative epoxy resin NC-3000 (biphenyl skeleton-containing novolak epoxy resin, manufactured by Nippon Kayaku Co., Ltd., epoxy equivalent: 275 g / eq) having a melt viscosity of 0.06 Pa ⁇ s
- NC-3000 biphenyl skeleton-containing novolak epoxy resin, manufactured by Nippon Kayaku Co., Ltd., epoxy equivalent: 275 g / eq
- the same experiment as in 1 was performed to obtain a resin composition (13) varnish for comparison.
- Comparative example 6 Comparative epoxy resin NC-3000 having a melt viscosity of 0.06 Pa ⁇ s as the epoxy resin (C) relative to 100 parts of a varnish containing 30% of the polyimide resin (A) of the present invention obtained in Synthesis Example 4 1.65 parts of biphenyl skeleton-containing novolak type epoxy resin, manufactured by Nippon Kayaku Co., Ltd., epoxy equivalent: 275 g / eq), besides, as a curing accelerator, 2-phenyl-4,5-dihydroxymethylimidazole (2PHZ) 2 Parts and 2 parts of ⁇ -butyrolactone as a solvent were added, respectively, and the mixture was stirred at 30 ° C.
- 2-phenyl-4,5-dihydroxymethylimidazole (2PHZ) 2 Parts and 2 parts of ⁇ -butyrolactone as a solvent were added, respectively, and the mixture was stirred at 30 ° C.
- Examples 9 to 16 The resin compositions (1) to (8) of the present invention obtained in Examples 1 to 8 are each coated on a PET film so that the thickness after drying is 150 ⁇ m, and dried at 130 ° C. for 10 minutes. The solvent was removed. The obtained film was peeled from the PET film to obtain the heat conductive adhesive films (1) to (8) of the present invention.
- Comparative Examples 7 to 12 The resin compositions (9) to (14) for comparison obtained in Comparative Examples 1 to 6 are respectively coated on a PET film so that the thickness after drying is 150 ⁇ m, and dried at 130 ° C. for 10 minutes. The solvent was removed. The obtained film was peeled from the PET film to obtain comparative thermally conductive adhesive films (9) to (14).
- the thermally conductive adhesive film obtained in each of the examples and comparative examples is cured to measure electrical insulation, thermal conductivity, adhesion at a low temperature of about 170 to 200 ° C., and glass transition temperature as follows. did. The measured results are shown in Table 1.
- thermally conductive adhesive films of Examples 9 to 16 and Comparative Examples 7 to 12 were treated at 170 ° C. for 1 hour to obtain a cured film.
- the electrical insulation property was measured by processing the obtained cured film with a dielectric breakdown tester (manufactured by Yasuda Seisakusho) under an electrical condition of 30 kV and 10 mA.
- Thermal conductivity heat dissipation
- Three thermal conductive adhesive films of Examples 9 to 16 and Comparative Examples 7 to 12 were respectively stacked, and heat press-bonded for 60 minutes under conditions of 180 ° C. and 1 MPa using a hot plate press to obtain a sample for thermal conductivity test Obtained.
- the thermal conductivity of the obtained sample was measured using a thermal conductivity measurement device (manufactured by Anter Corporation, UNITEM MODEL 2022).
- thermally conductive adhesive films of Examples 9 to 16 and Comparative Examples 7 to 12 were each made of 2 sheets of 18 ⁇ m thick electrolytic copper foil (CF-T9B-HTE, manufactured by Fukuda Metal Foil & Powder Industries) Both sides were sanded on the side, and pressure bonding was performed for 60 minutes under conditions of 180 ° C. and 1 MPa using a hot plate press to obtain a sample for adhesion test.
- CF-T9B-HTE electrolytic copper foil
- Low temperature adhesion (tensile shear adhesion strength after lamination with aluminum plate)
- two heat conductive metal adhesive films as the metal adherends and the heat conductive adhesive films of Examples 9 to 16 and Comparative Examples 7 to 12 as the adhesive layer are respectively used.
- Heat compression bonding was carried out at 180 ° C. and 1 MPa for 60 minutes to obtain a sample for tensile shear adhesion test.
- the tensile speed is set to 50 mm / sec in accordance with JIS K 6850-1999, and the adhesiveness (II) of the adhesive film at low temperature (tensile) Shear bond strength was measured.
- As temperature at the time of pulling it measured on two conditions of room temperature and 175 ° C.
- the heat conductive adhesive films of Examples 9 to 16 and Comparative Examples 7 to 12 were treated at 170 ° C. for 1 hour to obtain a cured film.
- the DMA of the obtained cured film was measured (using EXSTAR DMS 6100 manufactured by Seiko Instruments Inc.), and tan ⁇ max was measured as a glass transition temperature.
- the polyimide resin varnishes of Synthesis Examples 1 to 9 are separately coated on a PET film so that the thickness after drying is 25 ⁇ m, dried at 130 ° C. for 10 minutes to remove the solvent, and treated at 170 ° C. for 1 hour I got a film.
- the DMA of the obtained film was measured (using EXSTAR DMS 6100 manufactured by Seiko Instruments Inc.), and tan ⁇ max was measured as a glass transition temperature.
- the electrical insulation property is about 6 KV
- the thermal conductivity is 12 W / mK or more
- the adhesiveness at low temperature (I) is about 6 N / cm
- Adhesion at low temperature (II) is about 9 MPa when measured at room temperature, 8 MPa when measured at 175 ° C
- the objective was achieved with a degree, a glass transition temperature of 200 ° C. or more.
- Comparative Examples 7 to 12 the purpose is not achieved in one or more of these characteristic values.
- the details will be described below.
- Comparative Example 7 is a polyimide resin composition having no phenolic hydroxyl group
- Comparative Example 8 is a polyimide resin composition having a large content of phenolic hydroxyl group.
- the glass transition temperature is as low as 165 ° C. in Comparative Example 7 and does not reach the target value, whereas in Examples 9 to 12 of the present invention, the temperature is 200 ° C. or higher. So, we have achieved the target value.
- the dielectric breakdown occurs at 3.0 KV, while in the inventive examples 9 to 12, the dielectric breakdown does not occur up to about 6 KV.
- the thermal conductivity is only 8 W / mK in Comparative Example 9 and 7.5 W / mK in Comparative Example 10, while Examples 9 to 16 of the present invention show high values of 12 W / mK or more.
- the adhesion (II) tensile shear adhesive strength after lamination with an aluminum plate
- Examples 9 to 16 of the present invention show a high value of about 8 MPa.
- Comparative Examples 9 and 10 are resin compositions using a polyamide resin, and Comparative Example 9 is a case where an epoxy resin having a low melt viscosity is used, and Comparative Example 10 is a case where an epoxy resin having a high melt viscosity is used. .
- Example 9 of the present invention using an epoxy resin having a low melt viscosity, dielectric breakdown does not occur up to a voltage as high as 6.0 KV (5.8 KV in Example 14) in electrical insulation, and thermal conduction The rate also shows a high value of 13 W / mk (12.7 W / mk in Example 15). Therefore, in the aromatic polyimide resin composition containing a phenolic hydroxyl group, a remarkable effect is exhibited when using an epoxy resin having a lower melt viscosity than when using an epoxy resin having a high melt viscosity.
Abstract
Description
(ア) フェノール性水酸基を含有する芳香族ポリイミド樹脂(A)、フィラー(B)、および溶融粘度が0.04Pa・s以下であるエポキシ樹脂(C)を含有し、かつポリイミド樹脂(A)、フィラー(B)、およびエポキシ樹脂(C)の質量部の比率が(A):(C)=99:1~1:99、((A)+(C)):(B)=80:20~5:95の関係を満たす樹脂組成物、
(イ) フェノール性水酸基を含有する芳香族ポリイミド樹脂(A)が下記式(1):
(ウ) 式(1)で表される繰り返し単位において、
R1が下記式(2):
R2が下記式(3):
R3が下記式(4):
(オ) (ア)~(エ)のいずれかに記載の樹脂組成物が、有機溶剤に溶解してなるワニス、
(カ) (ア)~(エ)のいずれかに記載の樹脂組成物からなる熱伝導性接着フィルム、
(キ) (カ)に記載の熱伝導性接着フィルムと、銅箔、アルミニウム箔またはステンレス箔とからなる積層物、
(ク) (カ)に記載の熱伝導性接着フィルムと放熱板との積層物、
(ケ) (ア)~(エ)のいずれかに記載の樹脂組成物の硬化層と、銅箔、アルミニウム箔またはステンレス箔とからなる積層物、
(コ) (ア)~(エ)のいずれかに記載の樹脂組成物の硬化層と放熱板との積層物、
この樹脂は通常、下記式(5):
下記式(6):
下記式(7):
R1が下記式(2):
R2が下記式(3):
R3が下記式(4):
平均粒子径は、攪拌混合中の液をサンプリングして、測定すれば良い。平均粒子径の測定はグラインドゲージ(粒度ゲージ)またはレーザ回折粒度分布測定装置で行うことができる。
なお、本発明において、エポキシ樹脂の溶融粘度は、150℃において、コーンプレート型粘度計を用いて測定したものとする。
両面から放熱できるタイプのパワーモジュールの両面に、本発明の熱伝導性接着フィルムの硬化層を介して、冷却器を直接接着させることは、本発明の熱伝導性接着フィルムの好ましい用途の一つとして挙げることができる。
m+n=100/(100R-100) (a)
n/(m+n)=N/(M+N) (b)
温度計、環流冷却器、ディーンスターク装置、粉体導入口、窒素導入装置及び攪拌装置のついた500mlの反応器に、ジアミン化合物としてAPB-N(1,3-ビス-(3-アミノフェノキシ)ベンゼン、三井化学株式会社製、分子量292.33)30.79部(0.105モル)及びジアミノフェノール化合物としてABPS(3,3’-ジアミノ-4,4’-ジヒドロキシジフェニルスルホン、日本化薬株式会社製、分子量280.30)0.467部(0.0017モル)を仕込み、乾燥窒素を流しながら溶剤としてγ-ブチロラクトン68.58部を加え、70℃で30分間撹拌した。その後、テトラカルボン酸二無水物として、ODPA(4,4’-オキシジフタル酸無水物、マナック株式会社製、分子量310.22)32.54部(0.105モル)、溶剤としてγ-ブチロラクトン71.40部、触媒としてピリジン1.66部及び脱水剤としてトルエン28.49部を添加して反応器内を180℃まで昇温した。ディーンスターク装置を用いてイミド化反応により発生する水を除去しながら、180℃で3時間加熱閉環反応を行った後、更に4時間加熱を行いピリジン及びトルエンを除去した。反応終了後、80℃以下に冷却した反応液に孔径3μmのテフロン(登録商標)製フィルターを用いて加圧濾過を施すことにより、下記式(8):
温度計、環流冷却器、ディーンスターク装置、粉体導入口、窒素導入装置及び攪拌装置のついた500mlの反応器に、ジアミン化合物としてAPB-N(1,3-ビス-(3-アミノフェノキシ)ベンゼン、三井化学株式会社製、分子量292.33)30.63部(0.105モル)及びジアミノフェノール化合物としてABPS(3,3’-ジアミノ-4,4’-ジヒドロキシジフェニルスルホン、日本化薬株式会社製、分子量280.30)0.623部(0.0022モル)を仕込み、乾燥窒素を流しながら溶剤としてγ-ブチロラクトン68.58部を加え、70℃で30分間撹拌した。その後、テトラカルボン酸二無水物として、ODPA(4,4’-オキシジフタル酸無水物、マナック株式会社製、分子量310.22)32.54部(0.105モル)、溶剤としてγ-ブチロラクトン71.41部、触媒としてピリジン1.66部及び脱水剤としてトルエン28.49部を添加して反応器内を180℃まで昇温した。ディーンスターク装置を用いてイミド化反応により発生する水を除去しながら、180℃で3時間加熱閉環反応を行った後、更に4時間加熱を行いピリジン及びトルエンを除去した。反応終了後、80℃以下に冷却した反応液に孔径3μmのテフロン(登録商標)製フィルターを用いて加圧濾過を施すことにより、下記式(8):
温度計、環流冷却器、ディーンスターク装置、粉体導入口、窒素導入装置及び攪拌装置のついた500mlの反応器に、ジアミン化合物としてAPB-N(1,3-ビス-(3-アミノフェノキシ)ベンゼン、三井化学株式会社製、分子量292.33)30.31部(0.104モル)及びジアミノフェノール化合物としてABPS(3,3’-ジアミノ-4,4’-ジヒドロキシジフェニルスルホン、日本化薬株式会社製、分子量280.30)0.935部(0.0033モル)を仕込み、乾燥窒素を流しながら溶剤としてγ-ブチロラクトン68.56部を加え、70℃で30分間撹拌した。その後、テトラカルボン酸二無水物として、ODPA(4,4’-オキシジフタル酸無水物、マナック株式会社製、分子量310.22)32.55部(0.105モル)、溶剤としてγ-ブチロラクトン71.42部、触媒としてピリジン1.66部及び脱水剤としてトルエン28.49部を添加して反応器内を180℃まで昇温した。ディーンスターク装置を用いてイミド化反応により発生する水を除去しながら、180℃で3時間加熱閉環反応を行った後、更に4時間加熱を行いピリジン及びトルエンを除去した。反応終了後、80℃以下に冷却した反応液に孔径3μmのテフロン(登録商標)製フィルターを用いて加圧濾過を施すことにより、下記式(8):
温度計、環流冷却器、ディーンスターク装置、粉体導入口、窒素導入装置及び攪拌装置のついた500mlの反応器に、ジアミン化合物としてAPB-N(1,3-ビス-(3-アミノフェノキシ)ベンゼン、三井化学株式会社製、分子量292.33)30.04部(0.103モル)及びジアミノフェノール化合物としてABPS(3,3’-ジアミノ-4,4’-ジヒドロキシジフェニルスルホン、日本化薬株式会社製、分子量280.30)1.200部(0.0043モル)を仕込み、乾燥窒素を流しながら溶剤としてγ-ブチロラクトン68.55部を加え、70℃で30分間撹拌した。その後、テトラカルボン酸二無水物として、ODPA(4,4’-オキシジフタル酸無水物、マナック株式会社製、分子量310.22)32.56部(0.105モル)、溶剤としてγ-ブチロラクトン71.43部、触媒としてピリジン1.66部及び脱水剤としてトルエン28.49部を添加して反応器内を180℃まで昇温した。ディーンスターク装置を用いてイミド化反応により発生する水を除去しながら、180℃で3時間加熱閉環反応を行った後、更に4時間加熱を行いピリジン及びトルエンを除去した。反応終了後、80℃以下に冷却した反応液に孔径3μmのテフロン(登録商標)製フィルターを用いて加圧濾過を施すことにより、下記式(8):
温度計、環流冷却器、ディーンスターク装置、粉体導入口、窒素導入装置及び攪拌装置のついた500mlの反応器に、ジアミン化合物としてAPB-N(1,3-ビス-(3-アミノフェノキシ)ベンゼン、三井化学株式会社製、分子量292.33)30.54部(0.104モル)及びジアミノフェノール化合物としてBAFA(2,2-ビス(3-アミノ-4-ヒドロキシフェニル)ヘキサフルオロプロパン、日本化薬株式会社製、分子量366.26)0.814部(0.0022モル)を仕込み、乾燥窒素を流しながら溶剤としてγ-ブチロラクトン68.79部を加え、70℃で30分間撹拌した。その後、テトラカルボン酸二無水物として、ODPA(4,4’-オキシジフタル酸無水物、マナック株式会社製、分子量310.22)32.44部(0.105モル)、溶剤としてγ-ブチロラクトン71.19部、触媒としてピリジン1.66部及び脱水剤としてトルエン28.49部を添加して反応器内を180℃まで昇温した。ディーンスターク装置を用いてイミド化反応により発生する水を除去しながら、180℃で3時間加熱閉環反応を行った後、更に4時間加熱を行いピリジン及びトルエンを除去した。反応終了後、80℃以下に冷却した反応液に孔径3μmのテフロン(登録商標)製フィルターを用いて加圧濾過を施すことにより、下記式(9):
温度計、環流冷却器、ディーンスターク装置、粉体導入口、窒素導入装置及び攪拌装置のついた500mlの反応器に、ジアミン化合物としてAPB-N(1,3-ビス-(3-アミノフェノキシ)ベンゼン、三井化学株式会社製、分子量292.33)30.70部(0.105モル)及びジアミノジフェノール化合物としてHAB(3,3’-ジアミノビフェニル-4,4’-ジオール、日本化薬株式会社製、分子量216.24)0.481部(0.0022モル)を仕込み、乾燥窒素を流しながら溶剤としてγ-ブチロラクトン68.42部を加え、70℃で30分間撹拌した。その後、テトラカルボン酸二無水物として、ODPA(4,4’-オキシジフタル酸無水物、マナック株式会社製、分子量310.22)32.62部(0.105モル)、溶剤としてγ-ブチロラクトン71.57部、触媒としてピリジン1.66部及び脱水剤としてトルエン28.49部を添加して反応器内を180℃まで昇温した。ディーンスターク装置を用いてイミド化反応により発生する水を除去しながら、180℃で3時間加熱閉環反応を行った後、更に4時間加熱を行いピリジン及びトルエンを除去した。反応終了後、80℃以下に冷却した反応液に孔径3μmのテフロン(登録商標)製フィルターを用いて加圧濾過を施すことにより、下記式(10):
温度計、環流冷却器、ディーンスターク装置、粉体導入口、窒素導入装置及び攪拌装置のついた500mlの反応器に、ジアミン化合物としてAPB-N(1,3-ビス-(3-アミノフェノキシ)ベンゼン、三井化学株式会社製、分子量292.33)31.27部(0.107モル)を仕込み、乾燥窒素を流しながら溶剤としてγ-ブチロラクトン68.61部を加え、70℃で30分間撹拌した。その後、テトラカルボン酸二無水物として、ODPA(4,4’-オキシジフタル酸無水物、マナック株式会社製、分子量310.22)32.53部(0.105モル)、溶剤としてγ-ブチロラクトン71.37部、触媒としてピリジン1.66部及び脱水剤としてトルエン28.49部を添加して反応器内を180℃まで昇温した。ディーンスターク装置を用いてイミド化反応により発生する水を除去しながら、180℃で3時間加熱閉環反応を行った後、更に4時間加熱を行いピリジン及びトルエンを除去した。反応終了後、80℃以下に冷却した反応液に孔径3μmのテフロン(登録商標)製フィルターを用いて加圧濾過を施すことにより、下記式(11):
温度計、環流冷却器、ディーンスターク装置、粉体導入口、窒素導入装置及び攪拌装置のついた500mlの反応器に、ジアミン化合物としてAPB-N(1,3-ビス-(3-アミノフェノキシ)ベンゼン、三井化学株式会社製、分子量292.33)26.06部(0.089モル)及びジアミノフェノール化合物としてABPS(3,3’-ジアミノ-4,4’-ジヒドロキシジフェニルスルホン、日本化薬株式会社製、分子量280.30)5.097部(0.0182モル)を仕込み、乾燥窒素を流しながら溶剤としてγ-ブチロラクトン68.37部を加え、70℃で30分間撹拌した。その後、テトラカルボン酸二無水物として、ODPA(4,4’-オキシジフタル酸無水物、マナック株式会社製、分子量310.22)32.64部(0.105モル)、溶剤としてγ-ブチロラクトン71.62部、触媒としてピリジン1.67部及び脱水剤としてトルエン28.49部を添加して反応器内を180℃まで昇温した。ディーンスターク装置を用いてイミド化反応により発生する水を除去しながら、180℃で3時間加熱閉環反応を行った後、更に4時間加熱を行いピリジン及びトルエンを除去した。反応終了後、80℃以下に冷却した反応液に孔径3μmのテフロン(登録商標)製フィルターを用いて加圧濾過を施すことにより、下記式(8):
温度計、冷却管、分留管及び撹拌機を取り付けたフラスコに、窒素パージを施しながら、5-ヒドロキシイソフタル酸3.64部(0.02モル)、イソフタル酸162.81部(0.98モル)、3,4’-ジアミノジフェニルエーテル204.24部(102モル)、塩化リチウム10.68部、N-メチルピロリドン1105部及びピリジン236.28部を加えて撹拌溶解させた後、亜リン酸トリフェニル512.07部を加えて95℃で4時間縮合反応をさせることによりフェノール性水酸基含有芳香族ポリアミド樹脂を含む反応液を得た。この反応液に撹拌を施しながら、90℃で水670部を3時間かけて滴下し、更に90℃で1時間撹拌した。その後60℃まで冷却して30分間静置したところ、上層が水層、下層が油層(樹脂層)に層分離したため、上層をデカンテーションによって除去した。除去した上層の量は1200部であった。油層(樹脂層)にN,N-ジメチルホルムアミド530部を加え、希釈液とした。該希釈液に、水670部を添加し、静置した。層分離後、デカンテーションにより、水層除去した。この水洗工程を4回繰り返してフェノール性水酸基含有芳香族ポリアミド樹脂の洗浄を行った。洗浄終了後、得られた成分(A”)の希釈液を、撹拌された水8000部中に2流体ノズルを用いて噴霧し、析出した粒径5~50μmの成分(A”)の微粉を濾別した。得られた析出物のウェットケーキを、メタノール2700部に分散させ撹拌下で2時間還流した。次いでメタノールを濾別し、濾取した析出物を水3300部で洗浄後、乾燥することにより、下記式(12):
合成例1で得られた本発明のポリイミド樹脂(A)を30%含有するワニス100部に対し、エポキシ樹脂(C)として溶融粘度が0.003Pa・sであるRE-602S(ビスフェノールF型エポキシ樹脂、日本化薬株式会社製、エポキシ当量188g/eq)を16部、それ以外にエポキシ樹脂硬化剤としてGPH-65(ビフェニルフェノール縮合型ノボラック樹脂、日本化薬株式会社製、水酸基当量200g/eq)を4部、硬化促進剤として2-フェニル-4,5-ジヒドロキシメチルイミダゾール(2PHZ)を0.3部、溶剤としてγ-ブチロラクトン33部をそれぞれ加え、30℃で2時間攪拌することによりポリイミド樹脂(A)とエポキシ樹脂(C)の和の濃度が30%の混合溶液を得た。得られた混合溶液50部(ポリイミド樹脂(A)とエポキシ樹脂(C)の和の質量が15部)に対し、フィラー(B)として、窒化ホウ素(水島合金鉄株式会社製、熱伝導率50W/mK)を45部(対樹脂固形分300%)加えて三本ロールで混練し、本発明の樹脂組成物(1)ワニスを得た。ポリイミド樹脂(A)、フィラー(B)、およびエポキシ樹脂(C)の質量部の関係は、(A):(C)=65:35、((A)+(C)):(B)=25:75であった。
用いられるポリイミド樹脂ワニスを、合成例2で得られたポリイミド樹脂(A)を30%含有するワニスとした以外は実施例1と同様の実験を行い、本発明の樹脂組成物(2)ワニスを得た。ポリイミド樹脂(A)、フィラー(B)、およびエポキシ樹脂(C)の質量部の関係は、(A):(C)=65:35、((A)+(C)):(B)=25:75であった。
用いられるポリイミド樹脂ワニスを、合成例3で得られたポリイミド樹脂(A)を30%含有するワニスとした以外は実施例1と同様の実験を行い、本発明の樹脂組成物(3)ワニスを得た。ポリイミド樹脂(A)、フィラー(B)、およびエポキシ樹脂(C)の質量部の関係は、(A):(C)=65:35、((A)+(C)):(B)=25:75であった。
用いられるポリイミド樹脂ワニスを、合成例4で得られたポリイミド樹脂(A)を30%含有するワニスとした以外は実施例1と同様の実験を行い、本発明の樹脂組成物(4)ワニスを得た。ポリイミド樹脂(A)、フィラー(B)、およびエポキシ樹脂(C)の質量部の関係は、(A):(C)=65:35、((A)+(C)):(B)=25:75であった。
用いられるポリイミド樹脂ワニスを、合成例5で得られたポリイミド樹脂(A)を30%含有するワニスとした以外は実施例1と同様の実験を行い、本発明の樹脂組成物(5)ワニスを得た。ポリイミド樹脂(A)、フィラー(B)、およびエポキシ樹脂(C)の質量部の関係は、(A):(C)=65:35、((A)+(C)):(B)=25:75であった。
用いられるポリイミド樹脂ワニスを、合成例6で得られたポリイミド樹脂(A)を30%含有するワニスとした以外は実施例1と同様の実験を行い、本発明の樹脂組成物(6)ワニスを得た。ポリイミド樹脂(A)、フィラー(B)、およびエポキシ樹脂(C)の質量部の関係は、(A):(C)=65:35、((A)+(C)):(B)=25:75であった。
用いられるエポキシ樹脂を溶融粘度が0.02Pa・sであるYX4000(アルキルビフェノール類骨格エポキシ樹脂、三菱化学株式会社製、エポキシ当量186g/eq)とした以外は実施例1と同様の実験を行い、本発明の樹脂組成物(7)ワニスを得た。ポリイミド樹脂(A)、フィラー(B)、およびエポキシ樹脂(C)の質量部の関係は、(A):(C)=65:35、((A)+(C)):(B)=25:75であった。
合成例1で得られた本発明のポリイミド樹脂(A)を30%含有するワニス100部に対し、エポキシ樹脂(C)として溶融粘度が0.003Pa・sであるRE-602S(ビスフェノールF型エポキシ樹脂、日本化薬株式会社製、エポキシ当量188g/eq)を30部、それ以外にエポキシ樹脂硬化剤としてGPH-65(ビフェニルフェノール縮合型ノボラック樹脂、日本化薬株式会社製、水酸基当量200g/eq)を5部、硬化促進剤として2-フェニル-4,5-ジヒドロキシメチルイミダゾール(2PHZ)を0.4部、溶剤としてγ-ブチロラクトン65部をそれぞれ加え、30℃で2時間攪拌することによりポリイミド樹脂(A)とエポキシ樹脂(C)の和の濃度が30%の混合溶液を得た。得られた混合溶液50部(ポリイミド樹脂(A)とエポキシ樹脂(C)の和の質量が15部)に対し、フィラー(B)として、窒化ホウ素(水島合金鉄株式会社製、熱伝導率50W/mK)を45部(対樹脂固形分300%)加えて三本ロールで混練し、本発明の樹脂組成物(8)ワニスを得た。ポリイミド樹脂(A)、フィラー(B)、およびエポキシ樹脂(C)の質量部の関係は、(A):(C)=50:50、((A)+(C)):(B)=25:75であった。
用いられるポリイミド樹脂ワニスを、合成例7で得られたn=0である比較用ポリイミド樹脂を30%含有するワニスとした以外は実施例1と同様の実験を行い、比較用の樹脂組成物(9)ワニスを得た。ポリイミド樹脂(A)、フィラー(B)、およびエポキシ樹脂(C)の質量部の関係は、(A):(C)=65:35、((A)+(C)):(B)=25:75であった。
用いられるポリイミド樹脂ワニスを、合成例8で得られたn/m+n=0.17である比較用ポリイミド樹脂を30%含有するワニスとした以外は実施例1と同様の実験を行い、比較用の樹脂組成物(10)ワニスを得た。ポリイミド樹脂(A)、フィラー(B)、およびエポキシ樹脂(C)の質量部の関係は、(A):(C)=65:35、((A)+(C)):(B)=25:75であった。
用いられるポリイミド樹脂ワニスを、合成例9で得られた比較用フェノール性水酸基含有芳香族ポリアミド樹脂を30%含有するワニスとした以外は実施例1と同様の実験を行い、比較用の樹脂組成物(11)ワニスを得た。ポリアミド樹脂(A”)、フィラー(B)、およびエポキシ樹脂(C)の質量部の関係は、(A”):(C)=65:35、((A”)+(C)):(B)=25:75であった。
合成例9で得られた比較用フェノール性水酸基含有芳香族ポリアミド樹脂を30%含有するワニス100部に対し、エポキシ樹脂(C)として溶融粘度が0.06Pa・sである比較用エポキシ樹脂NC-3000(ビフェニル骨格含有ノボラック型エポキシ樹脂、日本化薬株式会社製、エポキシ当量188g/eq)を3部、それ以外にエポキシ樹脂硬化剤としてGPH-65(ビフェニルフェノール縮合型ノボラック樹脂、日本化薬株式会社製、水酸基当量200g/eq)を0.75部、硬化促進剤として2-フェニル-4,5-ジヒドロキシメチルイミダゾール(2PHZ)を0.3部、溶剤としてγ-ブチロラクトン6部をそれぞれ加え、30℃で2時間攪拌することによりポリアミド樹脂(A”)とエポキシ樹脂(C)の和の濃度が30%の混合溶液を得た。得られた混合溶液50部(ポリアミド樹脂(A”)とエポキシ樹脂(C)の和の質量が15部)に対し、フィラー(B)として、窒化ホウ素(水島合金鉄株式会社製熱伝導率50W/mK)を45部(対樹脂固形分300%)加えて三本ロールで混練し、比較用の樹脂組成物(12)ワニスを得た。ポリアミド樹脂(A”)、フィラー(B)、およびエポキシ樹脂(C)の質量部の関係は、(A”):(C)=91:9、((A”)+(C)):(B)=25:75であった。
用いられるエポキシ樹脂を溶融粘度が0.06Pa・sである比較用エポキシ樹脂NC-3000(ビフェニル骨格含有ノボラック型エポキシ樹脂、日本化薬株式会社製、エポキシ当量275g/eq)とした以外は実施例1と同様の実験を行い、比較用の樹脂組成物(13)ワニスを得た。ポリイミド樹脂(A)、フィラー(B)、およびエポキシ樹脂(C)の質量部の関係は、(A):(C)=65:35、((A)+(C)):(B)=25:75であった。
合成例4で得られた本発明のポリイミド樹脂(A)を30%含有するワニス100部に対し、エポキシ樹脂(C)として溶融粘度が0.06Pa・sである比較用エポキシ樹脂NC-3000(ビフェニル骨格含有ノボラック型エポキシ樹脂、日本化薬株式会社製、エポキシ当量275g/eq)を1.65部、それ以外に硬化促進剤として2-フェニル-4,5-ジヒドロキシメチルイミダゾール(2PHZ)を2部、溶剤としてγ-ブチロラクトン2部をそれぞれ加え、30℃で2時間攪拌することによりポリイミド樹脂(A)とエポキシ樹脂(C)の和の濃度が30%の混合溶液を得た。得られた混合溶液50部(ポリイミド樹脂(A)とエポキシ樹脂(C)の和の質量が15部)に対し、フィラー(B)として、窒化ホウ素(水島合金鉄株式会社製、熱伝導率50W/mK)を45部(対樹脂固形分300%)加えて三本ロールで混練し、比較用の樹脂組成物(14)ワニスを得た。ポリイミド樹脂(A)、フィラー(B)、およびエポキシ樹脂(C)の質量部の関係は、(A):(C)=95:5、((A)+(C)):(B)=25:75であった。
実施例1~8で得られた本発明の樹脂組成物(1)~(8)ワニスを、それぞれPETフィルム上に乾燥後の厚みが150μmになるように塗布し、130℃で10分乾燥して溶剤を除去した。得られたフィルムをPETフィルムから剥離することにより、本発明の熱伝導性接着フィルム(1)~(8)を得た。
比較例1~6で得られた比較用の樹脂組成物(9)~(14)ワニスを、それぞれPETフィルム上に乾燥後の厚みが150μmになるように塗布し、130℃で10分乾燥して溶剤を除去した。得られたフィルムをPETフィルムから剥離することにより、比較用の熱伝導性接着フィルム(9)~(14)を得た。
150℃におけるコーンプレート法における溶融粘度
測定機械:コーンプレート(ICI)高温粘度計
(RESEARCH EQUIPMENT(LONDON)LTD.製)
コーンNo.:3(測定範囲0~2.00Pa・s)
試料量:0.155±0.01g
実施例9~16および比較例7~12の熱伝導性接着フィルムを170℃で1時間処理し、硬化フィルムを得た。得られた硬化フィルムを絶縁破壊試験機(安田製作所製)にて30kV、10mAの電気的条件で処理することにより、電気絶縁性を測定した。
実施例9~16および比較例7~12の熱伝導性接着フィルムをそれぞれ3枚重ね、熱板プレス機を用いて180℃、1MPaの条件で60分間加熱圧着して熱伝導性試験用サンプルを得た。得られたサンプルの熱伝導率を、熱伝導率測定器(Anter Corporation製、UNITEM MODEL2022)を用いて測定した。
実施例9~16および比較例7~12の熱伝導性接着フィルムをそれぞれ厚み18μmの電解銅箔(CF-T9B-HTE、福田金属箔粉工業製)2枚で粗面を熱伝導性接着フィルム側にして両面をサンドし、熱板プレス機を用いて180℃、1MPaの条件で60分間加熱圧着して密着試験用サンプルを得た。これらのサンプルについて、テンシロン試験機(東洋ボールドウィン製)を用いて、JIS C6481に準拠して、1cm幅の試験片を、引きはがし速度を3mm/分に設定し、90°(プラスマイナス5°)の方向に引きはがし、接着フィルムの低温での接着性(I)(銅箔との積層後の剥離強度)を測定した。
JIS K 6850-1999に準拠して、金属被着体としてアルミ板2枚、接着層として実施例9~16および比較例7~12の熱伝導性接着フィルムを、それぞれ熱板プレス機を用いて180℃、1MPaの条件で60分間加熱圧着して引っ張りせん断接着試験用サンプルを得た。これらのサンプルについて、テンシロン試験機(東洋ボールドウィン製)を用いて、JIS K 6850-1999に準拠して、引っ張り速度を50mm/秒に設定し、接着フィルムの低温での接着性(II)(引っ張りせん断接着強度)を測定した。引っ張り時の温度として、室温と175℃の2条件にて測定を行った。
実施例9~16および比較例7~12の熱伝導性接着フィルムを170℃で1時間処理し、硬化フィルムを得た。得られた硬化フィルムのDMAを測定し(セイコーインスツル製EXSTAR DMS6100を使用)、tanδmaxをガラス転移温度として測定した。また、別途合成例1~9のポリイミド樹脂ワニスをそれぞれPETフィルム上に乾燥後の厚みが25μmになるように塗布し、130℃で10分乾燥して溶剤を除去し、170℃で1時間処理し、フィルムを得た。得られたフィルムのDMAを測定し(セイコーインスツル製EXSTAR DMS6100を使用)、tanδmaxをガラス転移温度として測定した。
Claims (14)
- フェノール性水酸基を含有する芳香族ポリイミド樹脂(A)、フィラー(B)、および溶融粘度が0.04Pa・s以下であるエポキシ樹脂(C)を含有し、かつポリイミド樹脂(A)、フィラー(B)、およびエポキシ樹脂(C)の質量部の比率が(A):(C)=99:1~1:99、((A)+(C)):(B)=80:20~5:95の関係を満たす樹脂組成物。
- フィラー(B)が窒化アルミニウムおよび窒化ホウ素より選ばれる少なくとも1種である請求項1~3のいずれかに記載の樹脂組成物。
- 請求項1~4のいずれかに記載の樹脂組成物が、有機溶剤に溶解してなるワニス。
- 請求項1~4のいずれかに記載の樹脂組成物からなる熱伝導性接着フィルム。
- 請求項6に記載の熱伝導性接着フィルムと、銅箔、アルミニウム箔またはステンレス箔とからなる積層物。
- 請求項6に記載の熱伝導性接着フィルムと放熱板との積層物。
- 請求項1~4のいずれかに記載の樹脂組成物の硬化層と、銅箔、アルミニウム箔またはステンレス箔とからなる積層物。
- 請求項1~4のいずれかに記載の樹脂組成物の硬化層と放熱板との積層物。
- 請求項1~4のいずれかに記載の樹脂組成物の硬化層を有する電子部品。
- 樹脂組成物の硬化層が、パワーモジュールと冷却器との間に、両者に接して存在する請求項11に記載の電子部品。
- パワーモジュールが炭化ケイ素系パワーモジュールである請求項12に記載の電子部品。
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