WO2022202939A1 - 硬化性樹脂組成物 - Google Patents
硬化性樹脂組成物 Download PDFInfo
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- WO2022202939A1 WO2022202939A1 PCT/JP2022/013718 JP2022013718W WO2022202939A1 WO 2022202939 A1 WO2022202939 A1 WO 2022202939A1 JP 2022013718 W JP2022013718 W JP 2022013718W WO 2022202939 A1 WO2022202939 A1 WO 2022202939A1
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- resin composition
- curable resin
- weight loss
- thermosetting resin
- epoxy resin
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Classifications
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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
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
-
- 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
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/50—Amines
- C08G59/5046—Amines heterocyclic
- C08G59/5053—Amines heterocyclic containing only nitrogen as a heteroatom
- C08G59/5073—Amines heterocyclic containing only nitrogen as a heteroatom having two nitrogen atoms in the ring
-
- 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
- C08K3/02—Elements
- C08K3/08—Metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L101/00—Compositions of unspecified macromolecular compounds
-
- 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
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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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0313—Organic insulating material
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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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
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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
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
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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
- C08K2201/00—Specific properties of additives
- C08K2201/01—Magnetic additives
Definitions
- the present invention relates to a curable resin composition, and more particularly to a curable resin composition that can be used as a filling material for filling through holes such as through holes and recesses in printed wiring boards.
- a wiring board or the like has been proposed in which a plurality of circuit elements such as a power supply circuit, a high frequency circuit, and a digital circuit are mounted on one substrate.
- Patent Document 1 discloses that a plurality of circuit elements are mounted on a multilayer wiring board by providing a magnetic layer between each substrate or filling through vias with a magnetic material. It has been proposed that noise can be reduced in a small size and at a low cost even in the case of Further, Patent Document 2 proposes filling through holes and via holes with a conductive paste containing a magnetic filler for electrical interlayer connection in a multilayer wiring board.
- Patent Literature 3 proposes a printed wiring board provided with a hole formed by drilling a through hole or a via hole partway through using a method called a back drilling method.
- JP 2017-017175 A Japanese Patent Application Laid-Open No. 2001-203463 Japanese Patent Publication No. 2007-509487
- a high Q value is required as a characteristic of inductor elements for high frequency bands.
- the Q value can be improved by increasing the relative magnetic permeability ( ⁇ ′) of the insulating layer that constitutes the high-frequency inductor element. Therefore, there is a demand for a material that can increase the relative magnetic permeability of the insulating layer.
- ⁇ ′ relative magnetic permeability
- the formation of a coating film and the ability to fill small diameters and narrow gaps are required, and the demand for paste magnetic materials is also increasing.
- an object of the present invention is to provide a curable resin composition that can be suitably used as a paste that can be applied or filled on a printed wiring board with a high degree of freedom in wiring formation, and that can form a coating film without variation.
- An object of the present invention is to provide a curable resin composition from which a cured product having a high relative magnetic permeability can be stably obtained over time.
- the present inventors investigated the difficulty in forming a uniform coating film in a paste-like magnetic material and the cause of the change in relative magnetic permeability over time, and found that the components in the paste-like magnetic material were It has been found that the viscosity changes over time due to volatilization beyond a certain level, making it difficult to form a coating film without variation. It was also found that the relative magnetic permeability changes due to volatilization of specific components over time even after the coating film is formed.
- the present invention is based on such findings. That is, the gist of the present invention is as follows.
- thermosetting resin has a 5% weight loss temperature of more than 180° C. by thermogravimetric analysis
- the diluent component is contained in an amount of 30% by mass or less with respect to the total amount of the thermosetting resin and the diluent component.
- the thermosetting resin is liquid.
- thermosetting resin contains an epoxy resin having a viscosity of 1 Pa ⁇ s or less.
- thermosetting resin contains an epoxy resin having a viscosity of 1 Pa ⁇ s or less.
- the curable resin composition according to [4] containing 35% by mass or more of the epoxy resin with respect to the entire thermosetting resin.
- the curable resin composition according to [1] which is used as a filler for through-holes or recesses in printed wiring boards.
- thermosetting resin having a 5% weight loss temperature of more than 180 ° C. by thermogravimetric analysis;
- a diluent component whose 5% weight loss temperature by analysis is 50 ° C. or higher and 180 ° C. or lower, it is possible to form a coating film without variation, and cure with a stable high relative magnetic permeability over time.
- It can be used as a curable resin composition from which a product can be obtained, so it can be suitably used as a paste that can be applied or filled in a printed wiring board with a high degree of freedom in wiring formation.
- it can be suitably used as an insulating material for high-frequency inductor elements that require high relative magnetic permeability in the range of 10 MHz to 200 MHz.
- the curable resin composition of the present invention contains a thermosetting resin, a curing agent, magnetic powder, and a diluent component as essential components.
- the term "liquid” refers to a fluid state or a semi-liquid state (paste state) having fluidity at at least one of 20°C and 40°C. Each component will be described in detail below.
- thermosetting resin As the thermosetting resin contained in the curable resin composition according to the present invention, any compound that can be cured by heat can be used without particular limitation, as long as the 5% weight loss temperature is higher than 180° C. by thermogravimetric analysis. be able to. A more preferred 5% weight loss temperature is above 200°C.
- the "5% weight loss temperature by thermogravimetric analysis” refers to a differential calorimetric weight measuring device (for example, TG / DTA6200, Hitachi High-Tech Science Co., Ltd., TGA5500, TA Instruments Japan Co., Ltd.), put a measurement sample weight of 10 mg to 30 mg in an aluminum pan (non-airtight type) in an air atmosphere, and heat it from 20 ° C to 500 ° C at a temperature increase rate of 10 ° C / min. It means the temperature at which the weight of the sample decreases by 5% relative to the weight of the sample before heating.
- the thermosetting resin is diluted with a solvent or the like, the weight loss temperature of the thermosetting resin alone without the solvent is measured.
- Thermosetting resins include isocyanate compounds, blocked isocyanate compounds, amino resins, carbodiimide resins, cyclocarbonate compounds, epoxy resins, oxetane compounds, episulfide resins, urea resins, resins having a triazine ring such as melamine resins, Saturated polyester resin, maleimide resin such as bismaleimide compound, polyurethane resin, diallyl phthalate resin, benzoxazine resin, polyimide resin, polyamideimide resin, benzocyclobutene resin, novolac type cyanate resin, bisphenol A type cyanate resin, bisphenol E type cyanate Resins, cyanate ester resins such as bisphenol-type cyanate resins such as tetramethylbisphenol F-type cyanate resins, silicone resins, and other known and commonly used resins can be used. These can be used alone or in combination of two or more. Among these, epoxy resins are preferred.
- Any epoxy resin can be used without limitation as long as it has two or more epoxy groups in one molecule.
- bisphenol A type epoxy resin bisphenol F type epoxy resin, bisphenol E (AD) type epoxy resin, bisphenol S type epoxy resin, hydrogenated bisphenol A type epoxy resin, brominated bisphenol A type epoxy resin, bisphenol S type epoxy resin Epoxy resins having a bisphenol-type skeleton such as, phenol novolac-type epoxy resins, cresol novolac-type epoxy resins, bisphenol A novolac-type epoxy resins, biphenyl-type epoxy resins, naphthol-type epoxy resins, naphthalene-type epoxy resins, dicyclopentadiene, which will be described later.
- the above epoxy resins can be used singly or in combination of two or more.
- bisphenol A type epoxy resin, bisphenol F type epoxy resin, and bisphenol E (AD) type epoxy resin are preferable.
- the epoxy resin having a bisphenol skeleton may be liquid, semi-solid, or solid, but is preferably liquid from the viewpoint of filling properties.
- bisphenol A type epoxy resin It is preferable to use two types of bisphenol A type epoxy resin and bisphenol F type epoxy resin in combination.
- These commercial products include ZX-1059 (a mixture of bisphenol A type and bisphenol F type epoxy resin) manufactured by Nippon Steel Chemical & Materials Co., Ltd., and JER 828, JER 834, and JER 1001 manufactured by Mitsubishi Chemical Corporation. (Bisphenol A type epoxy resin), JER 807, JER 4004P (Bisphenol F type epoxy resin), R710 (Bisphenol E type epoxy resin) manufactured by Air Water, and the like.
- the curable resin composition of the present invention can also contain a polyfunctional epoxy resin as a thermosetting resin.
- polyfunctional epoxy resins include EP-3300E manufactured by ADEKA Corporation, which is a hydroxybenzophenone-type liquid epoxy resin, JER 630 manufactured by Mitsubishi Chemical Corporation, which is an aminophenol-type liquid epoxy resin (para-aminophenol-type liquid epoxy resin), ELM-100 manufactured by Sumitomo Chemical Co., Ltd., jER 604 manufactured by Mitsubishi Chemical Co., Ltd., which is a glycidylamine type epoxy resin, Epotato YH-434 manufactured by Nippon Steel Chemical & Materials Co., Ltd., Sumiepoxy ELM manufactured by Sumitomo Chemical Co., Ltd. -120, a phenolic novolac type epoxy resin manufactured by The Dow Chemical Company. E. N. 431 and the like. These polyfunctional epoxy resins can be used singly or in combination of two or more.
- the thermosetting resin is preferably in a liquid form rather than a solid form from the viewpoint of coating properties such as the film-forming properties of the curable resin composition, that is, printability.
- the thermosetting resin preferably has a viscosity at 25° C. of 5 Pa ⁇ s or less, more preferably 3 Pa ⁇ s or less, and even more preferably 1 Pa ⁇ s or less.
- the blending amount of the above-described thermosetting resin is preferably 3% by mass or more and 25% by mass or less, more preferably 5% by mass or more and 15% by mass or less, relative to the entire composition.
- thermosetting resin having a 5% weight loss temperature of more than 180°C by thermogravimetric analysis include an epoxy resin having a viscosity of 1 Pa ⁇ s or less at 25°C.
- an epoxy resin having a viscosity of 1 Pa ⁇ s or less at 25°C By including such a low-viscosity epoxy resin, magnetic powder and other fillers can be highly filled, and the viscosity of the curable resin composition can be lowered, so that the printability is improved, and the printed wiring board can be used. When applied, the degree of freedom in wiring formation can be increased.
- the viscosity means the viscosity measured in accordance with JIS Z 8803:2011, 10 "Method for measuring viscosity using a cone-plate rotational viscometer", specifically, cone-plate viscosity Using a meter (TVE-33H, manufactured by Toki Sangyo Co., Ltd.), a 3° ⁇ R14 cone rotor is used for liquids with a viscosity of less than 10 Pa s, and a paste with a viscosity of 10 to 300 Pa s. , refers to values measured under the conditions of 25° C., 5.0 rpm, and 30 seconds using a cone rotor of 3° ⁇ R9.7.
- the amount of the epoxy resin having a viscosity of 1 Pa s or less is preferably 35% by mass or more, preferably 60% by mass, based on the total thermosetting resin having a 5% weight loss temperature of over 180°C by thermogravimetric analysis. It is more preferable to be above.
- the curable resin composition according to the present invention contains a diluent component having a 5% weight loss temperature of 50° C. or higher and 180° C. or lower by thermogravimetric analysis.
- a diluent component having a 5% weight loss temperature of 50° C. or higher and 180° C. or lower by thermogravimetric analysis.
- the curable resin composition is a thermosetting resin having a 5% weight loss temperature of more than 180 ° C. by thermogravimetric analysis, and a 5% weight loss temperature of 50 ° C. or higher and 180 ° C.
- thermogravimetric analysis By containing a certain diluent component, the components in the curable resin composition are less likely to volatilize under a room temperature environment such as during coating film formation, thereby suppressing rapid changes in viscosity over time. As a result, the coatability (printability) of the curable resin composition is improved, and it becomes easier to form a coating film having a uniform thickness. In addition, even after the coating film is formed, there is little change in viscosity until the curable resin composition is cured, so the magnetic powder is suppressed from aggregating or precipitating, so the relative magnetic permeability decreases over time. It is considered that a cured product having a stable relative magnetic permeability without any problems can be obtained.
- the curable resin composition when the curable resin composition is cured (that is, when heated), most of the diluted components volatilize and shrink, so the magnetic powder ratio per volume in the cured product increases, and the relative magnetic permeability decreases. This is considered to be an improvement.
- the mechanism of action described above is only speculation and is not necessarily limited to this.
- the 5% weight loss temperature of the diluted component measured by thermogravimetric analysis is preferably 60° C. or higher and 160° C. or lower, more preferably 70° C. or higher and 150° C. or lower. More preferably, the temperature is 80° C. or higher and 140° C. or lower.
- diluent components having a 5% weight loss temperature of 50° C. or higher and 180° C. or lower by thermogravimetric analysis include alicyclic epoxy resins such as LDO and low molecular weight glycidyl ether type epoxy resins. Glycidyl ether, ethylhexyl glycidyl ether, allyl glycidyl ether and the like can be used. In addition, organic solvents such as ketones, aromatic hydrocarbons, glycol ethers, glycol ether acetates, esters, alcohols, aliphatic hydrocarbons, and petroleum solvents can also be used. These diluent components may be used singly or as a mixture of two or more.
- All of the diluent component described above does not necessarily have to be volatilized during curing of the curable resin composition, and a part of it may act as one component during the curing reaction together with the thermosetting resin.
- a diluent component when an alicyclic epoxy resin such as LDO is used as a diluent component, cure shrinkage increases, so that the relative magnetic permeability of the cured product can be significantly improved.
- a compound having the same functional group as the reactive functional group of the thermosetting resin as a diluent component, the affinity with the thermosetting resin is improved and the viscosity change of the curable resin composition is suppressed. Therefore, it becomes easy to form a coating film without variation.
- thermosetting resin is an epoxy resin
- LDO dipropylene glycol methyl ether, diethylene glycol monoethyl ether acetate, or the like
- the affinity with the resin component is high, and the coating film formability over time. improves.
- the amount of the diluent component described above is preferably 30% by mass or less with respect to the total amount of the thermosetting resin and the diluent component. It is more preferably 20% by mass.
- the curable resin composition according to the present invention contains a curing agent for curing the above thermosetting resin.
- a curing agent for curing thermosetting resins
- known curing agents generally used for curing thermosetting resins can be used, such as amines, imidazoles, polyfunctional phenols, acid anhydrides and isocyanates. , and polymers containing these functional groups, and if necessary, a plurality of these may be used.
- Amines include dicyandiamide, diaminodiphenylmethane, and the like.
- Examples of imidazoles include alkyl-substituted imidazoles and benzimidazoles.
- the imidazole compound may also be an imidazole latent curing agent such as an imidazole adduct.
- polyfunctional phenols examples include hydroquinone, resorcinol, bisphenol A and their halogen compounds, and condensates of these with aldehydes such as novolak and resole resins.
- Acid anhydrides include phthalic anhydride, hexahydrophthalic anhydride, methylnadic anhydride, benzophenonetetracarboxylic acid and the like.
- Isocyanates include tolylene diisocyanate, isophorone diisocyanate, and the like, and these isocyanates may be used after being masked with phenols or the like.
- One type of these curing agents may be used alone, or two or more types may be used in combination.
- amines and imidazoles can be preferably used from the viewpoint of adhesion to the conductive portion and the insulating portion, storage stability, and heat resistance.
- Adduct compounds of aliphatic polyamines such as alkylenediamines having 2 to 6 carbon atoms, polyalkylenepolyamines having 2 to 6 carbon atoms, and aromatic ring-containing aliphatic polyamines having 8 to 15 carbon atoms, or isophoronediamine, 1,3-bis
- the main component is an alicyclic polyamine adduct compound such as (aminomethyl)cyclohexane, or a mixture of the above aliphatic polyamine adduct compound and the above alicyclic polyamine adduct compound.
- adduct compound of the aliphatic polyamine those obtained by subjecting the aliphatic polyamine to addition reaction with aryl glycidyl ether (especially phenyl glycidyl ether or tolyl glycidyl ether) or alkyl glycidyl ether are preferable.
- aryl glycidyl ether especially phenyl glycidyl ether or tolyl glycidyl ether
- alkyl glycidyl ether alkyl glycidyl ether
- adduct compound of the alicyclic polyamine those obtained by subjecting the alicyclic polyamine to addition reaction with n-butyl glycidyl ether, bisphenol A diglycidyl ether or the like are preferable.
- Aliphatic polyamines include alkylenediamines having 2 to 6 carbon atoms such as ethylenediamine and propylenediamine, polyalkylenepolyamines having 2 to 6 carbon atoms such as diethylenetriamine and triethylenetriamine, and aromatic ring-containing fats having 8 to 15 carbon atoms such as xylylenediamine. group polyamines.
- Examples of commercially available modified aliphatic polyamines include Fujicure FXE-1000, Fujicure FXR-1020, Fujicure FXR-1030, Fujicure FXR-1080, Fujicure FXR-1090M2 (manufactured by T&K TOKA Co., Ltd.), Ancamine 2089K, and Sunmide P. -117, Sunmide X-4150, Ancamine 2422, Serwet R, Sunmide TX-3000, Sunmide A-100 (manufactured by Evonik Japan Co., Ltd.) and the like.
- alicyclic polyamines examples include isophoronediamine, 1,3-bis(aminomethyl)cyclohexane, bis(4-aminocyclohexyl)methane, norbornenediamine, 1,2-diaminocyclohexane, and lalomine.
- modified alicyclic polyamines include Ancamine 1618, Ancamine 2074, Ancamine 2596, Ancamine 2199, Sunmide IM-544, Sunmide I-544, Ancamine 2075, Ancamine 2280, Ancamine 1934, and Ancamine 2228 (Evonik Japan Co., Ltd.).
- EH-5015S manufactured by ADEKA Co., Ltd.
- EH-5015S can be mentioned as a polyamine-type curing agent.
- imidazoles include reaction products of epoxy resin and imidazole.
- Examples of commercially available imidazole compounds include imidazoles such as 2E4MZ, C11Z, C17Z, and 2PZ, imidazole AZINE compounds such as 2MZ-A and 2E4MZ-A, and imidazoles such as 2MZ-OK and 2PZ-OK. and imidazole hydroxymethyl compounds such as isocyanurate of 2PHZ and 2P4MHZ (all of which are manufactured by Shikoku Kasei Kogyo Co., Ltd.).
- Examples of commercially available imidazole-type latent curing agents include Cure Duct P-0505 (manufactured by Shikoku Kasei Kogyo Co., Ltd.).
- the amount of the above-described curing agent is preferably 0.4% by mass or more and 2.5% by mass or less in terms of solid content with respect to the entire composition.
- the curable resin composition according to the present invention contains magnetic powder.
- the inclusion of magnetic powder can suppress or absorb noise electromagnetic waves in a nearby electromagnetic field, so even when a plurality of circuit elements are mounted, the printed wiring board has excellent characteristics such as noise suppression. be able to.
- it can be suitably used as an insulating material for high-frequency inductor elements that require a high relative magnetic permeability in the range of 1 MHz to 200 MHz.
- Magnetic powders that can be used without particular limitation include Mg--Zn ferrite, Mn--Zn ferrite, Mn--Mg ferrite, Cu--Zn ferrite, Mg--Mn--Sr ferrite, and Ni--Zn.
- Non-conductive magnetic materials such as garnet-type ferrites such as ferrite, pure iron powder, Fe—Si alloy powder, Fe—Si—Al alloy powder, Ni powder, Fe—Ni alloy powder, Fe—Ni -Mo-based alloy powder, Fe--Ni--Mo--Cu-based alloy powder, Fe--Co-based alloy powder, Fe--Ni--Co-based alloy powder, Fe--Cr-based alloy powder, Fe--Cr--Si-based alloy powder, Fe Conductive magnetic materials such as Fe alloys such as -Ni--Cr alloy powders, Fe--Cr--Al alloy powders, Ni alloys, amorphous alloys such as Fe-based amorphous and Co-based amorphous alloys.
- Non-conductive magnetic powder can be used by adjusting the blending amount or coating the surface with an insulating inorganic or organic material.
- a commercially available magnetic filler can be used as the magnetic powder.
- Specific examples of commercially available magnetic fillers include “PST-S” manufactured by Sanyo Special Steel Co., Ltd., and "AW2-08PF20F”, “AW2-08PF10F”, “AW2-08PF8F”, and “AW2-08PF3F” manufactured by Epson Atmix Corporation. ”, “Fe-3.5Si-4.5CrPF20F”, “Fe-50NiPF20F”, “Fe-80Ni-4MoPF20F”, JFE Chemical Co., Ltd.
- L-M “LD-M”, “LD-MH”, “KNI-106” , “KNI-106GSM”, “KNI-106GS”, “KNI-109”, “KNI-109GSM”, “KNI-109GS”, manufactured by Toda Kogyo Co., Ltd.
- KNS-415 "BSF-547”, “BSF -029”, “BSN-125”, “BSN-714”, “BSN-828”, “JR09P2” manufactured by Japan Heavy Chemical Industries, Ltd., and the like.
- a magnetic substance may be used individually by 1 type, and may use 2 or more types together.
- the shape of the magnetic powder is not particularly limited, and includes spherical, needle-like, plate-like, scale-like, hollow, irregular, hexagonal, cubic, and flaky shapes.
- the average particle diameter of these magnetic powders is preferably 0.1 ⁇ m to 25 ⁇ m in consideration of the dispersibility of the magnetic filler, the ability to fill the holes, the smoothness when forming the wiring layer in the filled portion, and the like. is suitably in the range of 0.1 ⁇ m to 15 ⁇ m.
- the average particle size means the average primary particle size, and the average particle size (D50) can be measured by a laser diffraction/scattering method.
- the magnetic powder described above is preferably contained in a proportion of 60 to 94% by mass, more preferably in a proportion of 75 to 94% by mass, and further in a proportion of 85 to 94% by mass with respect to the entire curable resin composition. preferable.
- a dispersant may be used together.
- Phosphate esters, acrylic copolymers, polyamines, polyurethanes, polyesters, polyacrylates, their phosphates, alkylammonium salts and the like having an acidic group or a basic group or both of them can be suitably used as dispersants.
- the above dispersants may be used alone or in combination.
- the curable resin composition according to the present invention may contain a photocurable resin in combination with the thermosetting resin described above.
- Photocurable resins include curable resins that can be cured by radical addition polymerization reaction with active energy rays.
- Specific examples of radical addition polymerization reactive components having one or more ethylenically unsaturated groups in the molecule include commonly known polyester (meth)acrylates, polyether (meth)acrylates, and urethane (meth)acrylates. Acrylate, carbonate (meth)acrylate, epoxy (meth)acrylate and the like can be mentioned.
- glycol diacrylates such as ethylene glycol, methoxytetraethylene glycol, polyethylene glycol and propylene glycol
- acrylamides such as N,N-dimethylacrylamide, N-methylolacrylamide and N,N-dimethylaminopropylacrylamide
- Aminoalkyl acrylates such as N,N-dimethylaminoethyl acrylate and N,N-dimethylaminopropyl acrylate
- Polyhydric alcohols such as hexanediol, trimethylolpropane, pentaerythritol, dipentaerythritol and tris-hydroxyethyl isocyanurate or polyvalent acrylates such as ethylene oxide adducts, propylene oxide adducts, or ⁇ -caprolactone adducts thereof; phenoxy acrylate, bisphenol A diacrylate, and ethylene oxide adducts or propylene oxide adduct
- the curable resin is It is preferable to use a carboxyl group-containing resin.
- the carboxyl group-containing resin may be a carboxyl group-containing photosensitive resin having an ethylenically unsaturated group, and may or may not have an aromatic ring.
- the curable resin composition of the present invention contains a photocurable resin
- a photopolymerization initiator examples include benzoin compounds such as benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, and benzyl methyl ketal, and their alkyl ethers.
- acetophenone 2,2-dimethoxy-2-phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, diethoxyacetophenone, 2,2-diethoxy-2-phenylacetophenone, 1,1- Acetophenones such as dichloroacetophenone, 1-hydroxycyclohexylphenyl ketone, 2-methyl-1-[4-(methylthio)phenyl]-2-morpholino-propan-1-one; methylanthraquinone, 2-ethylanthraquinone, 2-tertiary -anthraquinones such as butylanthraquinone, 1-chloroanthraquinone, and 2-amylanthraquinone; thioxanthones such as thioxanthones; ketals such as acetophenone dimethyl ketal and benzyl dimethyl ketal; and benzophenones such as benzophenone and 4,4-bismethyla
- tertiary amines such as triethanolamine and methyldiethanolamine; 2-dimethylaminoethylbenzoic acid, ethyl 4-dimethylaminobenzoate and the like.
- a photopolymerization initiation aid such as a benzoic acid derivative.
- the curable resin composition according to the present invention contains fillers other than the magnetic powder described above within a range that does not impair the effects of the present invention, in order to relax stress due to curing shrinkage of the composition and to adjust the coefficient of linear expansion.
- the filler is not particularly limited, and conventionally known fillers can be used, such as silica, barium sulfate, calcium carbonate, silicon nitride, aluminum nitride, boron nitride, alumina, magnesium oxide, aluminum hydroxide, Examples include magnesium hydroxide, mica, and talc.
- fillers may be used alone, or two or more types may be used in combination.
- calcium carbonate, silica, barium sulfate, and aluminum oxide which are excellent in low hygroscopicity and low volume expansion, are preferably used, and silica and calcium carbonate are more preferably used.
- Silica may be amorphous, crystalline, or a mixture thereof. Amorphous (fused) silica is particularly preferred.
- Calcium carbonate may be either natural heavy calcium carbonate or synthetic precipitated calcium carbonate.
- a filler treated with a fatty acid or an amorphous filler such as organic bentonite or talc can be added to impart thixotropy.
- the curable resin composition of the present invention may contain a silane coupling agent.
- silane-based coupling agent By blending the silane-based coupling agent, it becomes possible to improve the adhesion between the magnetic powder or the filler and the thermosetting resin, thereby suppressing the occurrence of cracks in the cured product.
- the curable resin composition according to the present invention may optionally contain an oxazine compound having an oxazine ring obtained by reacting a phenol compound, formalin and a primary amine.
- an oxazine compound having an oxazine ring obtained by reacting a phenol compound, formalin and a primary amine.
- known colorants such as phthalocyanine blue, phthalocyanine green, disazo yellow, titanium oxide, carbon black and naphthalene black may be added to the curable resin composition according to the present invention.
- thermal polymerization inhibitors such as hydroquinone, hydroquinone monomethyl ether, tert-butyl catechol, pyrogallol, and phenothiazine for imparting storage stability during storage, and clay, kaolin, and the like for viscosity adjustment.
- known thickeners and thixotropic agents such as organic bentonite and montmorillonite can be added.
- known additives such as silicone-based, fluorine-based, polymer-based antifoaming agents, leveling agents, imidazole-based, thiazole-based, triazole-based, silane coupling agents, and other adhesive agents are added. be able to.
- organic bentonite is used, the portion protruding from the surface of the hole portion is easily formed into a protruding state that is easy to polish and remove, and is excellent in polishability, which is preferable.
- the curable resin composition according to the present invention preferably has a viscosity of 5 to 250 Pa s, more preferably 7 to 200 Pa s, more preferably 10 to 150 Pa s, in consideration of coatability (printability). It is even more preferable to have
- the viscosity of the curable resin composition is determined by the amount of the diluent component having a 5% weight loss temperature of 50 ° C. or more and 180 ° C. or less by thermogravimetric analysis, and the 5% weight loss temperature of more than 180 ° C. by thermogravimetric analysis. It can be adjusted according to the type and amount of the thermosetting resin component.
- the curable resin composition described above can be used widely and generally, but it is preferably for forming a cured film of a printed wiring board, more preferably for forming a permanent protective film, solder resist, More preferably, it is used as an interlayer insulating layer, a coverlay, or a filler (material) for filling holes.
- it is particularly preferable to use it as a filling material for filling holes, specifically, as a filling material for filling through holes such as through holes of printed wiring boards and recesses.
- the filling material is formed using a known patterning method such as a screen printing method, a roll coating method, a die coating method, and a vacuum printing method, for example, a multilayer printed wiring board. through-holes and recesses with bottoms.
- the inner diameter of the hole filled with the curable resin composition is preferably 0.05 to 0.8 mm, and the depth is preferably 0.4 to 10 mm.
- the inner diameter of the concave portion filled with the curable resin composition is 0.1 mm or more and the depth is 0.8 mm or less. At this time, it is preferable that the curable resin composition is completely filled so as to protrude slightly from the holes and recesses.
- the curable resin composition By heating the multilayer printed wiring board in which the holes and recesses are filled with the liquid curable resin composition, for example, at 80 to 160 ° C. for about 30 to 180 minutes, the curable resin composition is cured and a cured product is formed. be.
- the curing of the curable resin composition may be carried out in two stages from the viewpoint of easily removing unnecessary portions protruding from the substrate surface after filling the holes in the cured product by physical polishing. That is, the curable resin composition can be pre-cured at a lower temperature and then subjected to main curing (finish curing). Heating at 80 to 110° C. for about 30 to 180 minutes is preferable as the condition for pre-curing.
- the hardness of the pre-cured cured product is relatively low, the unnecessary portion protruding from the substrate surface can be easily removed by physical polishing, and the surface can be flattened. After that, it is heated to be fully cured. Heating at 130 to 180° C. for about 30 to 180 minutes is preferable as the condition for main curing.
- a hot air circulation drying oven for both pre-curing and main curing, a hot air circulation drying oven, IR oven, hot plate, convection oven, etc. (equipped with a steam air heating type heat source) is used to heat the dryer in the countercurrent direction.
- a contact method and a method of spraying onto the material to be cured from a nozzle) can be used.
- a hot air circulation drying furnace is particularly preferable.
- the cured product hardly expands or contracts due to its low expansibility, and the final cured product is excellent in dimensional stability, low hygroscopicity, adhesion, electrical insulation and the like.
- the hardness of the pre-cured product can be controlled by changing the heating time and heating temperature for pre-curing.
- the curable resin composition may be cured by irradiating it with an active energy ray.
- a photocurable resin such as a carboxyl group-containing photosensitive resin
- the integration of about 500 to 2000 mJ / cm 2
- the exposed portion is cured.
- it can be heated to a temperature of about 100 to 180° C. for thermal curing (post-curing).
- a predetermined circuit pattern is formed by patterning into a predetermined pattern. If necessary, the surface of the cured product may be roughened with an aqueous solution of potassium permanganate or the like, and then a wiring layer may be formed on the cured product by electroless plating or the like.
- the amount of the magnetic powder compounded in the table was adjusted so as to be constant on a weight basis in each curable resin composition.
- the content ratio of the diluent component in the table represents the content ratio (% by mass) with respect to the total amount of the thermosetting resin and the diluent component. represents the content ratio (% by mass) with respect to the entire thermosetting resin having a 5% weight loss temperature of over 180°C.
- the content ratio of the magnetic powder represents the content ratio (% by mass) with respect to the entire composition.
- *1 to *9 in Table 1 represent the following components.
- *1 Alicyclic epoxy resin (manufactured by Tomoe Kogyo Co., Ltd., LDO, 5% weight loss temperature: 109.1 ° C.)
- *2 1,6-hexanediol diglycidyl ether (Mitsubishi Chemical Corporation, YED216D, 5% weight loss temperature: 172.0°C)
- *3 Dipropylene glycol methyl ether (manufactured by Dow Chemical Japan Co., Ltd., Dowanol DPM, 5% weight loss temperature: 78.5 ° C.)
- 4 Mixed solvent of ethanol, IPA, and NPA (manufactured by Amakusu Kagaku Co., Ltd., Arcosol K, 5% weight loss temperature by thermogravimetric analysis: 23.4 ° C.
- the printability evaluation criteria were as follows. ⁇ : The difference between the highest value and the lowest value is 30 ⁇ m or less ⁇ : The difference between the highest value and the lowest value is more than 30 ⁇ m, 50 ⁇ m or less ⁇ : The difference between the highest value and the lowest value is more than 50 ⁇ m The evaluation results are shown in Table 1 below. Met.
- ⁇ The difference between the highest value and the lowest value is 30 ⁇ m or less ⁇ : The difference between the highest value and the lowest value is more than 30 ⁇ m, 50 ⁇ m or less ⁇ : The difference between the highest value and the lowest value is more than 50 ⁇ m
- Table 1 The evaluation results are shown in Table 1 below. Met.
- Each of the prepared curable resin compositions was screen-printed on the surface of a copper foil attached to an etched-out plate without viscosity adjustment to form a coating film having a thickness of 150 ⁇ m after curing.
- a cured coating film was formed by heat treatment at 150° C. for 45 minutes in a hot air circulation drying furnace (DF610 manufactured by Yamato Scientific Co., Ltd.).
- the cured coating film was peeled off from the copper foil, and the peeled cured coating film was cut into a toroidal shape having an outer diameter of 1.7 cm and an inner diameter of 0.5 cm to prepare an evaluation test piece.
- the relative magnetic permeability ( ⁇ ') was measured at a temperature of 25° C. and 100 MHz using an impedance analyzer E4291B manufactured by Keysight. The measurement results were as shown in Table 1 below.
- the curable resin compositions according to the present invention have excellent printability stability over time, and also have excellent relative permeability over time stability. It can be seen that Furthermore, compared with Comparative Example 2 containing no diluent component, the relative magnetic permeability is improved and the magnetic properties are excellent.
- the curable resin composition (Comparative Example 1) containing a diluent component having a 5% weight loss temperature of less than 50°C by thermogravimetric analysis when the composition is left at room temperature, some of the components in the composition It can be seen that it volatilizes and the printability stability over time is insufficient. In addition, it can be seen that the curable resin composition (Comparative Example 2) containing no diluent component has poor printability and a low relative magnetic permeability compared to the others.
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Abstract
Description
前記熱硬化性樹脂は、熱重量分析による5%重量減少温度が180℃超であり、
前記希釈成分は、熱重量分析による5%重量減少温度が50℃以上、180℃以下であることを特徴とする、硬化性樹脂組成物。
[2] 前記希釈成分が、前記熱硬化性樹脂および前記希釈成分の総量に対して30質量%以下含まれる、[1]に記載の硬化性樹脂組成物。
[3] 前記熱硬化性樹脂が液状である、[1]に記載の硬化性樹脂組成物。
[4] 前記熱硬化性樹脂は、粘度が1Pa・s以下のエポキシ樹脂を含む、[1]に記載の硬化性樹脂組成物。
[5] 前記エポキシ樹脂を、前記熱硬化性樹脂全体に対して35質量%以上含む、[4]に記載の硬化性樹脂組成物。
[6] プリント配線板の貫通孔または凹部の充填材として使用される、[1]に記載の硬化性樹脂組成物。
本発明の硬化性樹脂組成物は、熱硬化性樹脂と、硬化剤と、磁性粉体と、希釈成分とを必須成分として含む。なお、本明細書において「液状」とは、20℃および40℃の少なくとも一方の温度において流動性を有する液状状態または半液体状態(ペースト状態)にあることをいうものとする。以下、各成分について詳述する。
本発明による硬化性樹脂組成物に含まれる熱硬化性樹脂としては、熱重量分析による5%重量減少温度が180℃超であるものであれば、熱により硬化し得る化合物を特に制限なく使用することができる。より好ましい5%重量減少温度は200℃超である。なお、本明細書において「熱重量分析による5%重量減少温度」とは、示差熱量重量測定装置(例えば、TG/DTA6200、株式会社日立ハイテクサイエンスや、TGA5500、ティー・エイ・インスツルメント・ジャパン株式会社等)を用いて、Air雰囲気下、測定サンプル重量10mg~30mgをアルミパン(非気密型)に入れ、昇温速度10℃/分の条件で20℃から500℃まで昇温した際のサンプルの重量が、加熱前のサンプル重量に対して5%重量減少した温度を意味する。なお、熱硬化性樹脂が溶媒等で希釈されている場合は、当該溶媒を除いた熱硬化性樹脂単体での重量減少温度を測定するものとする。
本発明による硬化性樹脂組成物は、熱重量分析による5%重量減少温度が50℃以上、180℃以下である希釈成分を含む。このような希釈成分を含むことにより、ばらつきのない塗膜の形成が可能であり、経時的に安定して高い比透磁率を有する硬化物が得られる硬化性樹脂組成物とすることができる。この理由は必ずしも定かではないが以下のように推測される。すなわち、硬化性樹脂組成物が、上記した熱重量分析による5%重量減少温度が180℃超である熱硬化性樹脂と、熱重量分析による5%重量減少温度が50℃以上、180℃以下である希釈成分を含有することによって、塗膜形成時のような室温環境下において、硬化性樹脂組成物中の成分が揮発しにくいため経時的に粘度が急激に変化することが抑制される。その結果、硬化性樹脂組成物の塗布性(印刷適性)が向上し、ばらつきのない膜厚の塗膜を形成し易くなる。また、塗膜形成後も、硬化性樹脂組成物を硬化させるまでの間の粘度変化が少ないため磁性粉体が凝集したり沈殿することが抑制されるため、経時的に比透磁率が低下することのない安定した比透磁率を有する硬化物が得られるものと考えられる。さらに、硬化性樹脂組成物を硬化させる際(すなわち、加熱時)に希釈成分の大部分が揮発して収縮するため、硬化物中の体積あたりの磁性粉体割合が増加し、比透磁率が向上するものと考えられる。しかしながら、上記した作用機序はあくまでも推測の域であって必ずしもこの限りではない。
本発明による硬化性樹脂組成物は、上記した熱硬化性樹脂を硬化させるための硬化剤を含む。硬化剤としては、熱硬化性樹脂を硬化させるために一般的に使用されている公知の硬化剤を使用することができ、例えばアミン類、イミダゾール類、多官能フェノール類、酸無水物、イソシアネート類、およびこれらの官能基を含むポリマー類があり、必要に応じてこれらを複数用いても良い。アミン類としては、ジシアンジアミド、ジアミノジフェニルメタン等がある。イミダゾール類としては、アルキル置換イミダゾール、ベンゾイミダゾール等がある。また、イミダゾール化合物はイミダゾールアダクト体等のイミダゾール潜在性硬化剤であってもよい。多官能フェノール類としては、ヒドロキノン、レゾルシノール、ビスフェノールAおよびそのハロゲン化合物、さらに、これにアルデヒドとの縮合物であるノボラック、レゾール樹脂等がある。酸無水物としては、無水フタル酸、ヘキサヒドロ無水フタル酸、無水メチルナジック酸、ベンゾフェノンテトラカルボン酸等がある。イソシアネート類としては、トリレンジイソシアネート、イソホロンジイソシアネート等があり、このイソシアネートをフェノール類等でマスクしたものを使用しても良い。これら硬化剤は1種類を単独で用いてもよく、2種以上を併用してもよい。
本発明による硬化性樹脂組成物は磁性粉体を含む。磁性粉体が含まれることにより、近傍電磁界におけるノイズ電磁波を抑制ないし吸収することができるため、複数の回路要素を実装した場合であってもノイズ抑制等の特性に優れたプリント配線板とすることができる。また、1MHz~200MHzにおいて高い比透磁率が必要とされる高周波用インダクタ素子の絶縁材料として好適に使用することができる。
本発明による硬化性樹脂組成物は、上記した熱硬化性樹脂と併用して光硬化性樹脂が含まれていてもよい。光硬化性樹脂としては、活性エネルギー線によってラジカル性の付加重合反応により硬化し得る硬化性樹脂が挙げられる。分子中に1個以上のエチレン性不飽和基を有するラジカル性の付加重合反応性成分の具体例としては、例えば、慣用公知のポリエステル(メタ)アクリレート、ポリエーテル(メタ)アクリレート、ウレタン(メタ)アクリレート、カーボネート(メタ)アクリレート、エポキシ(メタ)アクリレート等が挙げることができる。具体的には、エチレングリコール、メトキシテトラエチレングリコール、ポリエチレングリコール、プロピレングリコール等のグリコールのジアクリレート類;N,N-ジメチルアクリルアミド、N-メチロールアクリルアミド、N,N-ジメチルアミノプロピルアクリルアミド等のアクリルアミド類;N,N-ジメチルアミノエチルアクリレート、N,N-ジメチルアミノプロピルアクリレート等のアミノアルキルアクリレート類;ヘキサンジオール、トリメチロールプロパン、ペンタエリスリトール、ジペンタエリスリトール、トリス-ヒドロキシエチルイソシアヌレート等の多価アルコールまたはこれらのエチレオキサイド付加物、プロピレンオキサイド付加物、もしくはε-カプロラクトン付加物等の多価アクリレート類;フェノキシアクリレート、ビスフェノールAジアクリレート、およびこれらのフェノール類のエチレンオキサイド付加物もしくはプロピレンオキサイド付加物等の多価アクリレート類;グリセリンジグリシジルエーテル、グリセリントリグリシジルエーテル、トリメチロールプロパントリグリシジルエーテル、トリグリシジルイソシアヌレート等のグリシジルエーテルの多価アクリレート類;前記に限らず、ポリエーテルポリオール、ポリカーボネートジオール、水酸基末端ポリブタジエン、ポリエステルポリオール等のポリオールを直接アクリレート化、もしくは、ジイソシアネートを介してウレタンアクリレート化したアクリレート類およびメラミンアクリレート、および前記アクリレートに対応する各メタクリレート類の少なくとも何れか一種等が挙げられる。なお、本明細書において、(メタ)アクリレートとは、アクリレート、メタクリレート及びそれらの混合物を総称する用語で、他の類似の表現についても同様である。上記した光硬化性樹脂は、液状であることが好ましい。
上記した硬化性樹脂組成物は広く一般的に使用することができるが、プリント配線板の硬化膜の形成用であることが好ましく、永久保護膜の形成用であることがより好ましく、ソルダーレジスト、層間絶縁層、カバーレイまたは穴埋め用の充填(材)として使用することがさらに好ましい。これらの用途のなかでも、穴埋め用充填材、具体的にはプリント配線板のスルーホール等の貫通孔や凹部の穴埋め用充填材として使用するのが特に好ましい。
下記表1に示す種々の成分を各表に示す割合(質量部)にて配合し、攪拌機にて混合し、実施例1~6および比較例1、2の各硬化性樹脂組成物を調製した。なお、表中の磁性粉体の配合量は、各硬化性樹脂組成物において重量基準で一定となるように調整した。また、表中の希釈成分含有割合は、熱硬化性樹脂と希釈成分の総量に対しての含有割合(質量%)を表し、粘度が1Pa・s以下のエポキシ樹脂の含有割合は、熱重量分析による5%重量減少温度が180℃超の熱硬化性樹脂全体に対しての含有割合(質量%)を表す。また、磁性粉体の含有割合は、組成物全体に対しての含有割合(質量%)を表す。
*1:脂環式エポキシ樹脂(巴工業株式会社製、LDO、5%重量減少温度:109.1℃)
*2:1,6-ヘキサンジオールジグリシジルエーテル(三菱ケミカル株式会社、YED216D、5%重量減少温度:172.0℃)
*3:ジプロピレングリコールメチルエーテル(ダウ・ケミカル日本株式会社製、ダワノールDPM、5%重量減少温度:78.5℃)
*4:エタノール、IPA、NPAの混合溶剤(甘糟化学株式会社製、アルコゾールK、熱重量分析による5%重量減少温度:23.4℃(混合溶剤としての5%重量減少温度))
*5:トリグリシジルアミノフェノール型エポキシ樹脂(三菱ケミカル株式会社製、jER 630、粘度:0.5~1Pa・s、液状エポキシ樹脂、5%重量減少温度:250.6℃)
*6:ビスフェノールA型エポキシ樹脂とビスフェノールF型エポキシ樹脂の50:50混合品(日鉄ケミカル&マテリアル株式会社製ZX-1059、粘度:1.9~2.6Pa・s、液状エポキシ樹脂、5%重量減少温度:271.5℃)
*7:アモルファス合金磁性粉体(エプソンアトミックス株式会社製、AW02-08PF8F、平均粒径5μm)
*8:酸基を含む共重合化合物(ビッグケミージャパン株式会社製、DISPERBYK-111)
*9:イミダゾール型硬化剤(四国化成工業株式会社製、2MZA-PW)
混合品)
なお、5%重量減少温度は、示差熱量重量測定装置(TG/DTA6200、株式会社日立ハイテクサイエンス)を用いて、Air雰囲気下、測定サンプル重量10~20mg、アルミパン(非気密型)、10℃/分の昇温速度、20~500℃の測定温度にて行った。
調製した各硬化性樹脂組成物を、粘度調整せずに銅箔基板(150mm×95mm、厚さ18μm)表面に80メッシュで2回スクリーン印刷を行い、硬化後の膜厚が100μmとなるように塗膜を形成した。次いで、熱風循環式乾燥炉(ヤマト科学株式会社製DF610)にて150℃×30分の熱処理を2回行うことにより硬化塗膜を形成した。
印刷適性は、硬化塗膜の膜厚にばらつきがあるか(膜厚制御)を確認した。膜厚はデジマチックマイクロメーター(株式会社ミツトヨ製)を用いて、硬化塗膜内の15mm等間隔の5点を測定し、最高値と最低値を確認した。印刷適性の評価基準は以下のとおりとした。
○:最高値と最低値の差が30μm以下
△:最高値と最低値の差が30μm超、50μm以下
×:最高値と最低値の差が50μm超
評価結果は下記の表1に示されるとおりであった。
実際の塗膜形成工程を再現するため、調製した各硬化性樹脂組成物を一旦、開放系の容器であるハイレジストBHR-150に50g投入し、25℃で20分間静置した後、上記と同様にして、粘度調整せずに銅箔基板表面に塗膜し、硬化させて硬化塗膜を形成した。
得られた硬化塗膜について、上記と同様にして印刷適性の評価を行った。印刷適性の評価基準は以下のとおりとした。
○:最高値と最低値の差が30μm以下
△:最高値と最低値の差が30μm超、50μm以下
×:最高値と最低値の差が50μm超
評価結果は下記の表1に示されるとおりであった。
調製した各硬化性樹脂組成物を、粘度調整を行わずに、エッチアウト板に貼り付けた銅箔表面にスクリーン印刷を行い、硬化後の膜厚が150μmとなるように塗膜を形成した。次いで、熱風循環式乾燥炉(ヤマト科学株式会社製DF610)にて150℃×45分間の熱処理により硬化塗膜を形成した。
続いて、硬化塗膜を銅箔から剥離し、剥離した硬化塗膜を外径1.7cm、内径0.5cmのトロイダル形状に切り出し、評価試験片を作製した。
上記のようにして得られた各評価試験片について、Keysight社製インピーダンスアナライザE4291Bを用いて、温度25℃、100MHzでの比透磁率(μ’)を測定した。測定結果は下記表1に示されるとおりであった。
実際の塗膜形成工程を再現するため、調製した各硬化性樹脂組成物を一旦、開放系の容器であるハイレジストBHR-150に50g投入し、25℃で20分間静置した後、上記と同様にして、粘度調整せずにエッチアウト板に貼り付けた銅箔表面に塗膜し、硬化させて硬化塗膜を形成した。
続いて、硬化塗膜を銅箔から剥離し、剥離した硬化塗膜を外径1.7cm、内径0.5cmのトロイダル形状に切り出し、評価試験片を作製し、上記と同様にして比透磁率の測定を行った。磁性特性の経時的安定性の評価基準は以下のとおりとした。
〇:比透磁率が、<磁性特性の評価>において測定した値より低下していない
×:比透磁率が、<磁性特性の評価>において測定した値より低下している
評価結果は下記表1に示されるとおりであった。なお、表中「-」とあるのは、硬化塗膜を形成できず、比透磁率を測定できなかったことを表す。
一方、熱重量分析による5%重量減少温度が50℃未満である希釈成分を含む硬化性樹脂組成物(比較例1)では、当該組成物を放置すると室温でも組成物中の成分の一部が揮発し、印刷適性の経時安定性が不十分であることがわかる。
また、希釈成分を含まない硬化性樹脂組成物(比較例2)では、印刷適性が悪く、比透磁率も他と比較して低いことがわかる。
多層プリント配線基板のスルーホール(内径が0.3mm、深さが3.2mm)に、実施例1~6で使用した各硬化性樹脂組成物をスクリーン印刷法により充填し、ラックに立て掛けて基板が載置面に対して90°±10°の角度となるように載置した状態で、熱風循環式乾燥炉(ヤマト科学株式会社製DF610)にて150℃×30分間の熱処理により組成物を硬化させた。
次いで、スルーホールを硬化物で充填した基板を用いて、穴埋めした後のスルーホール断面の光学顕微鏡観察および電子顕微鏡観察を行い、クラック発生の有無およびデラミ(剥離)の有無を確認した。
その結果、いずれの実施例の硬化性樹脂組成物を用いた穴埋めもクラック発生およびデラミ(剥離)の発生は確認されなかった。
Claims (6)
- 熱硬化性樹脂と、硬化剤と、磁性粉体と、希釈成分と、を含んでなる硬化性樹脂組成物であって、
前記熱硬化性樹脂は、熱重量分析による5%重量減少温度が180℃超であり、
前記希釈成分は、熱重量分析による5%重量減少温度が50℃以上、180℃以下であることを特徴とする、硬化性樹脂組成物。 - 前記希釈成分が、前記熱硬化性樹脂および前記希釈成分の総量に対して30質量%以下含まれる、請求項1に記載の硬化性樹脂組成物。
- 前記熱硬化性樹脂が液状である、請求項1に記載の硬化性樹脂組成物。
- 前記熱硬化性樹脂は、粘度が1Pa・s以下のエポキシ樹脂を含む、請求項1に記載の硬化性樹脂組成物。
- 前記エポキシ樹脂を、前記熱硬化性樹脂全体に対して35質量%以上含む、請求項4に記載の硬化性樹脂組成物。
- プリント配線板の貫通孔または凹部の充填材として使用される、請求項1に記載の硬化性樹脂組成物。
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EP4428192A1 (en) * | 2023-03-06 | 2024-09-11 | Ajinomoto Co., Inc. | Resin composition |
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WO2020022393A1 (ja) * | 2018-07-25 | 2020-01-30 | 味の素株式会社 | 磁性ペースト |
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