WO2012099131A1 - プリプレグ及びこれを用いた積層板並びにプリント配線板 - Google Patents
プリプレグ及びこれを用いた積層板並びにプリント配線板 Download PDFInfo
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- WO2012099131A1 WO2012099131A1 PCT/JP2012/050875 JP2012050875W WO2012099131A1 WO 2012099131 A1 WO2012099131 A1 WO 2012099131A1 JP 2012050875 W JP2012050875 W JP 2012050875W WO 2012099131 A1 WO2012099131 A1 WO 2012099131A1
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- prepreg
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
- C08J5/241—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs using inorganic fibres
- C08J5/244—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs using inorganic fibres using glass fibres
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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
- H05K1/0353—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement
- H05K1/0373—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement containing additives, e.g. fillers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
- C08J5/249—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs characterised by the additives used in the prepolymer mixture
-
- 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
- C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
- C08K3/013—Fillers, pigments or reinforcing additives
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
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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
- C08L101/00—Compositions of unspecified macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2300/00—Characterised by the use of unspecified polymers
- C08J2300/24—Thermosetting resins
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2363/00—Characterised by the use of epoxy resins; Derivatives of epoxy resins
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2379/00—Characterised by the use 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 C08J2361/00 - C08J2377/00
- C08J2379/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08J2379/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
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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
- H05K1/0353—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement
- H05K1/0366—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement reinforced, e.g. by fibres, fabrics
Definitions
- the present invention relates to a prepreg suitable for a semiconductor package or a printed wiring board, a laminated board using the prepreg, and a printed wiring board.
- a laminated board for printed wiring boards is obtained by coating a glass woven fabric with a resin composition mainly composed of an epoxy resin or the like to obtain a prepreg, laminating one or more sheets, placing a copper foil, and thermosetting by pressing. Things are common.
- Epoxy resins generally have a good balance of insulation, heat resistance, cost, etc., but because of their large coefficient of thermal expansion, low thermal expansion can be achieved by selecting an epoxy resin with an aromatic ring and increasing the filling of inorganic fillers such as silica. (See Patent Documents 1 and 2). It is possible to further reduce the coefficient of thermal expansion by filling the inorganic filler at a high rate, but increasing the filling amount of the inorganic filler reduces the insulation reliability due to moisture absorption and the resin composition layer-wiring. It is known that the adhesion between layers is insufficient and press molding is poor. In addition, there is known a method of uniformly dispersing an inorganic filler by using a silicone polymer to increase the filling (see Patent Document 3). However, for applications in multilayer wiring boards, there has been a limit to lowering the coefficient of thermal expansion by increasing the filling of the inorganic filler.
- Patent Document 4 a method for reducing the thermal expansion coefficient of a resin composition for a wiring board is generally a method of increasing the crosslinking density and increasing the Tg to decrease the thermal expansion coefficient as shown in Patent Documents 5 and 6.
- increasing the crosslink density is shortening the molecular chain between the functional groups, and shortening the molecular chain beyond a certain level is difficult in terms of reactivity and resin strength. For this reason, there was a limit to the reduction in the thermal expansion coefficient by the method of increasing the crosslinking density. Even when the thermal expansion coefficient is reduced, the internal stress in the manufacturing process may cause warpage during solder mounting, resulting in poor connection.
- the present invention relates to a prepreg excellent in low thermal expansion property and warping characteristics, which is difficult to be expressed only by using a resin effective for increasing the filling and low thermal expansion of conventional inorganic fillers, and a laminate and a printed wiring board using the same.
- the purpose is to provide.
- the present inventors have found that the prepreg coated with a thermosetting resin composition containing a modified silicone oil on a fiber substrate exhibits a phase separation structure.
- the present inventors have found that the problems can be solved and have completed the present invention.
- the present invention (1) In a prepreg comprising a fiber base material and a thermosetting resin composition layer, the thermosetting resin composition layer contains a modified silicone oil or a compound having a skeleton derived from a modified silicone oil, and the heat A prepreg characterized in that the layer of the curable resin composition has a phase separation structure; (2) The prepreg according to the above (1), wherein the area ratio of the island portion per unit area of the observation surface of the layer of the thermosetting resin composition is 10% or more and 45% or less, (3) The prepreg according to (1) or (2) above, wherein the modified silicone oil or the compound having a skeleton derived from the modified silicone oil has a dimethyl silicone skeleton in the molecular structure.
- thermosetting resin composition contains an epoxy resin, a cyanate resin, or a bismaleimide resin
- thermosetting resin composition contains an inorganic filler
- a prepreg that is excellent in low thermal expansion and warpage characteristics, and can be suitably used for laminated boards and printed wiring boards.
- the prepreg of the present invention comprises a fiber base material and a thermosetting resin composition layer, and can be produced, for example, by applying a thermosetting resin composition to a fiber base material.
- a prepreg generally refers to a material that is semi-cured by applying a thermosetting resin composition to a fiber substrate and performing heat drying.
- the fiber substrate inorganic fibers such as E glass, D glass, S glass, and Q glass, or polyethylene, polyparaphenylene benzobisoxazole, aramid, polyarylate, polyimide, polyester, polytetrafluoroethylene, and the like.
- Organic fibers can be used as these fibers may be woven fabric or non-woven fabric.
- the thickness of the fiber substrate is not particularly limited, and for example, a fiber base having a thickness of about 0.03 to 0.5 mm can be used, and a surface treated with a silane coupling agent or the like or mechanically opened. Those subjected to fiber treatment are preferred from the viewpoints of heat resistance, moisture resistance and processability.
- the layer of the thermosetting resin composition used in the prepreg of the present invention contains a modified silicone oil or a compound having a skeleton derived from a modified silicone oil (hereinafter referred to as “modified silicone oil etc.”) and has a phase separation structure. It is a feature.
- the layer of the thermosetting resin composition refers to a portion other than the fiber substrate of the prepreg (the layer of the thermosetting resin composition is a semi-cured thermosetting resin composition).
- the compound having a skeleton derived from the modified silicone oil in the present invention mainly refers to a compound produced by a reaction between the modified silicone oil and the thermosetting resin, which will be described in detail later.
- the phase separation structure in the present invention refers to a case where a sea-island structure is adopted.
- the phase separation structure include a spherical structure, a columnar structure, a rod-shaped structure, a pyramidal structure, a conical structure, an elliptical structure, a lamellar structure, and a bicontinuous structure.
- the island part and the sea part of the sea-island structure may partially react with each other by a reactive group.
- Modified silicone oil or the like may be contained in either the island or the sea part, but it is contained in the island part from the viewpoint of peel strength when laminated and the surface roughness after chemical roughening. It is preferable.
- the elastic modulus is different between the island portion and the sea portion of the present invention.
- the entire substrate can be made highly elastic.
- the island portion has higher elasticity than the sea portion and the sea portion has low elasticity, the entire substrate has a low coefficient of thermal expansion. It is preferable to change the configuration according to each purpose.
- the method for observing the phase separation structure of the present invention is not particularly limited as long as the phase separation structure can be observed.
- a method of observing the surface with a microscope a method of observing a cross section of the substrate with a microscope, a method of observing an ultra-thin section subjected to iodine staining with a transmission electron microscope, and a scanning electron microscope (hereinafter abbreviated as “SEM”).
- SEM scanning electron microscope
- FIG.1 and FIG.2 an observation method using X-rays.
- many of the above structures exhibit a spherical structure, which is preferable in achieving the effects of the present invention.
- the present invention uses a rigid and highly elastic resin and a soft and low elastic silicone oil in combination to form a phase-separated structure having a highly elastic part and a low elastic part, relieving stress and reducing low thermal expansion. It is possible to contribute to efficiency and to suppress warpage.
- the area ratio of the island portion per unit area of the observation surface of the layer of the thermosetting resin composition of the prepreg of the present invention is preferably 10% or more and 45% or less. This is because when the area ratio of the island portion is 10% or more, it is possible to develop low thermal expansion and low warpage of the prepreg and the laminate and wiring board using the prepreg, depending on the characteristics of the island portion. .
- the area ratio occupied by the island portion per unit area is more preferably 15% or more, and particularly preferably 20% or more.
- the upper limit is not particularly limited as long as it has a phase separation structure, but is usually about 50%, and preferably 45% or less in terms of the stability of the phase separation structure.
- FIG. 1 shows the result of surface observation at a magnification of 2000 using an SEM.
- the phase separation scale is 1.0 ⁇ m. It is preferable that the number of island portions is 5 or more around 20 ⁇ m ⁇ 20 ⁇ m.
- FIG. 2 shows a view of the surface observed using a SEM at a magnification of 10,000 times. When the phase separation structure cannot be confirmed at 2000 times, it is preferable to observe at 10,000 times.
- the number of island portions having a phase separation scale of 20 nm or more is about 200 nm ⁇ 200 nm.
- the phase separation scale means the maximum diameter of the island portion as shown in FIGS.
- the island portion often shows a spherical shape, in which case it means the diameter of the sphere.
- blended and used for a thermosetting resin composition is not regarded as an island part.
- the observation surface in the present invention refers to the surface, back surface, cross-section, etc. of the observation object, which is appropriately processed as necessary so that the prepreg, laminate and printed wiring board to be observed are adapted to SEM observation.
- a thermosetting resin composition is applied on a support made of a resin such as a glass plate, a metal plate or polyethylene terephthalate so that the resin thickness after drying is 35 to 45 ⁇ m, and then heated and dried. And a semi-cured product is obtained.
- the surface of the semi-cured product is ion milled using argon gas.
- C The surface is observed with a scanning electron microscope.
- the ion milling process can be performed by any one commonly used for pre-processing for SEM observation, and is not particularly limited. More specifically, the semi-cured material is irradiated with an unfocused argon ion beam, and the surface of the sample is polished without applying stress using a sputtering phenomenon. By such treatment, the phase separation structure is more clearly observed due to the difference in etching rate.
- the modified silicone oil contained in the thermosetting resin composition in the present invention refers to one having a linear siloxane skeleton and having a group other than hydrogen or a hydrocarbon group in the molecular structure.
- modified silicone oil what is marketed as modified silicone oil can be used.
- those having a dimethyl silicone skeleton in the molecular structure are preferable.
- those having a reactive group in the molecular structure are preferable, and those having a dimethyl silicone skeleton in the molecular structure and having a reactive group capable of reacting with a thermosetting resin in the molecular structure are particularly preferable. preferable.
- the reactive group may be introduced into a part of the side chain of the polysiloxane, may be introduced into one or both ends of the polysiloxane, or the side of the polysiloxane. In addition to the chain, it may be introduced at one or both ends.
- Examples of the reactive group include an epoxy group, an amino group, a hydroxyl group, a methacryl group, a mercapto group, a carboxyl group, an alkoxy group, and a silanol group.
- the silicone oil having an epoxy group in the molecular structure a commercially available product can be used.
- Group equivalent 490 “X-22-163A” (functional group equivalent 1000), “X-22-163B” (functional group equivalent 1750), “X-22-163C” (functional group equivalent 2700) at both ends.
- X-22-169AS having an alicyclic epoxy group (functional group equivalent 500), “X-22-169B” (functional group equivalent 1700), “X-22-173DX” having an epoxy group at one end (Functional group equivalent 4500), “X-22-9002” having an epoxy group on the side chain and both ends (functional group equivalent 5000), “X-22-343” having an epoxy group on the side chain (functional group equivalent) 25), “KF-101” (functional group equivalent 350), “KF-1001” (functional group equivalent 3500), “X-22-2000” (functional group equivalent 620), “X-22-4741” (functional Group equivalent 2500), “KF-1002” (functional group equivalent 4300), “X-22-2046” (functional group equivalent 600) having an alicyclic epoxy group in the side chain and “KF-102” (functional group equivalent) 3600, or more, manufactured by Shin-Etsu Chemical Co., Ltd.), which can be used alone or in combination of two or more and further mixed with various epoxy resins.
- silicone oil having an amino group in the molecular structure a commercially available product can be used.
- silicone oil having a hydroxyl group in the molecular structure commercially available products can be used.
- silicone oil having a methacryl group in the molecular structure a commercially available product can be used.
- X-22-164A having a methacryl group at both ends
- X-22-164B Frctional group equivalent 1630
- X-22-174DX functional group equivalent 4600
- silicone oil having a mercapto group in the molecular structure a commercially available product can be used, for example, “X-22-167B” (functional group equivalent 1670) having a mercapto group at both ends, and a mercapto group in the side chain.
- “KF-2001” (functional group equivalent 1900), “KF-2004” (functional group equivalent 30000), and the like are included. These may be used alone or in combination of two or more. May be used.
- silicone oil having a carboxyl group in the molecular structure a commercially available product can be used, for example, “X-22-162C” (functional group equivalent 2300) having a carboxyl group at both ends, and a carboxyl group at one end.
- “X-22-3710” having a functional group equivalent of 1450 and “X-22-3701E” having a carboxyl group in the side chain (functional group equivalent of 4000) manufactured by Shin-Etsu Chemical Co., Ltd.
- These may be used alone or in admixture of two or more.
- silicone oil having an alkoxy group in the molecular structure a commercially available product can be used.
- FZ-3704 functional group equivalent 150 having an alkoxy group in the side chain (above, manufactured by Toray Dow Corning Co., Ltd.) These may be used alone or in admixture of two or more.
- silicone oil having a silanol group in the molecular structure a commercially available product can be used.
- “X-21-5841” having a silanol group at both ends (functional group equivalent 500, manufactured by Shin-Etsu Chemical Co., Ltd.)
- “Z-6018” functional group content: 6% by weight, manufactured by Toray Dow Corning Co., Ltd.).
- silicone oil modified with an epoxy group, amino group or hydroxyl group is particularly preferred.
- a both-end modified silicone is preferable from the viewpoint of reactivity, and a functional group equivalent of 5000 or less is more preferable from the viewpoint of compatibility.
- the content of the modified silicone oil or the like in the thermosetting resin composition in the present invention is 2 mass with respect to 100 mass parts of the total amount of the thermosetting resin and the curing agent added as desired described in detail later. It is preferable that it is 80 parts by mass or more.
- the blending amount of the silicone oil is 2 parts by mass or more, the above-described phase separation structure is easily generated, which is preferable. From the above viewpoint, the blending amount of the silicone oil is more preferably 5 parts by mass or more, particularly preferably 7 parts by mass or more, and further preferably 10 parts by mass or more.
- the upper limit of the blending amount of the silicone oil is not particularly limited as long as the effects of the present invention are achieved, but is preferably 80 parts by mass or less from the viewpoint of moldability and adhesiveness of the prepreg, and 50 masses. More preferably, it is at most parts.
- thermosetting resin constituting the thermosetting resin composition in the present invention is not particularly limited, but examples thereof include unsaturated imide resins such as epoxy resins, phenol resins, and bismaleimide resins, cyanate resins, and isocyanate resins. , Benzoxazine resin, oxetane resin, amino resin, unsaturated polyester resin, allyl resin, dicyclopentadiene resin, silicone resin, triazine resin and melamine resin. These may be used alone or in combination of two or more. May be. Among these, epoxy resin, cyanate resin, and unsaturated imide resin are preferable from the viewpoint of moldability and electrical insulation.
- epoxy resin examples include bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, phenol novolac type epoxy resin, cresol novolak type epoxy resin, bisphenol A novolak type epoxy resin, bisphenol F novolak type epoxy resin.
- Stilbene type epoxy resin Triazine skeleton containing epoxy resin, Fluorene skeleton containing epoxy resin, Triphenolphenol methane type epoxy resin, Biphenyl type epoxy resin, Xylylene type epoxy resin, Biphenyl aralkyl type epoxy resin, Naphthalene type epoxy resin, Dicyclopentadiene -Type epoxy resin, alicyclic epoxy resin, polyfunctional phenols and diglycidyl ether compounds of polycyclic aromatics such as anthracene Beauty These phosphorus-containing epoxy resin obtained by introducing a phosphorus compound are mentioned, these alone, or may be used in combination of two or more.
- biphenylaralkyl type epoxy resins and naphthalene type epoxy resins are preferred from the viewpoint of heat resistance and flame retardancy.
- the cyanate resin include novolak-type cyanate resin, bisphenol A-type cyanate resin, bisphenol E-type cyanate resin, bisphenol-type cyanate resin of tetramethylbisphenol F-type cyanate resin, and prepolymers in which these are partially triazine. These may be used alone or in admixture of two or more. Among these, a novolak type cyanate resin is preferable from the viewpoint of heat resistance and flame retardancy.
- the unsaturated imide resin examples include bis (4-maleimidophenyl) methane, 3,3′-dimethyl-5,5′-diethyl-4,4′-diphenylmethane bismaleimide, 2,2′-bis [ Mention may be made of maleimide compounds such as 4- (4-maleimidophenoxy) phenyl] propane and polyphenylmethanemaleimide, and these may be used alone or in admixture of two or more. Of these, bismaleimide resins such as bis (4-maleimidophenyl) methane are preferred because of their heat resistance and low cost.
- the modified silicone oil when the modified silicone oil is contained in the island portion, the following three components can be considered as components constituting the island portion. That is, (1) When most of the modified silicone oil occupies (2) When the modified silicone oil and the modified silicone oil react with the thermosetting resin and the generated compound occupies, (3) When the modified silicone oil reacts with the thermosetting resin and the generated compound occupies most, It is.
- the compound having a skeleton derived from the modified silicone oil in the present invention mainly refers to a compound produced by the reaction of the modified silicone oil with the thermosetting resin in the above (2) and (3). Such a compound is usually produced at the time of prepreg production, but can be produced not only at the time of prepreg production but also in advance.
- a prepolymer by reacting a thermosetting resin and silicone oil in an organic solvent before blending.
- the organic solvent used in this reaction is not particularly limited, but alcohol solvents such as ethanol, propanol, butanol, methyl cellosolve, butyl cellosolve, and propylene glycol monomethyl ether; ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone Ester solvents such as ethyl acetate and ⁇ -butyrolactone; ether solvents such as tetrahydrofuran; aromatic solvents such as toluene, xylene and mesitylene; nitrogen atom-containing solvents such as dimethylformamide, dimethylacetamide and N-methylpyrrolidone; A sulfur atom-containing solvent such as dimethyl sulfoxide can be mentioned, and one or two or more kinds
- cyclohexanone, propylene glycol monomethyl ether, methyl isobutyl ketone, toluene and dimethylacetamide are preferable from the viewpoint of solubility, and propylene glycol monomethyl ether, toluene and Dimethylacetamide is particularly preferred.
- a reaction catalyst can be arbitrarily used for this reaction, and it will not be specifically limited if it is generally used as a reaction catalyst.
- reaction catalysts include zinc metal naphthenate, cobalt naphthenate, tin octylate, cobalt octylate, bisacetylacetonate cobalt (II), trisacetylacetonate cobalt (III), and other organic metal salts and organometallic complexes, Examples thereof include imidazoles and derivatives thereof, organophosphorus compounds, secondary amines, tertiary amines, and quaternary ammonium salts, and these can be used alone or in combination.
- a curing agent and a curing accelerator can be used as necessary.
- curing agents include, but are not limited to, polyfunctional phenolic compounds such as phenol novolak, cresol novolak, aminotriazine novolak resin; amine compounds such as dicyandiamide, diaminodiphenylmethane and diaminodiphenylsulfone; phthalic anhydride, anhydrous pyro Examples thereof include acid anhydrides such as merit acid, maleic anhydride and maleic anhydride copolymer, and these can be used alone or in combination. Of these, polyfunctional phenol compounds and amine compounds are preferred from the viewpoint of heat resistance and storage stability.
- Examples of the polyfunctional phenol compound include novolak resins and xylylene skeleton-containing phenols made from various phenols such as phenol, cresols, ethylphenols, butylphenols, octylphenols, bisphenol A, bisphenol F, bisphenol S, and naphthols.
- Various novolak resins such as novolak resin, dicyclopentadiene skeleton-containing phenol novolak resin, biphenyl skeleton-containing phenol novolak resin, and fluorene skeleton-containing phenol novolak resin may be mentioned.
- amine compounds include acidic substituents in the molecular structure such as p-aminophenol, p-aminobenzoic acid, p-aminobenzenesulfonic acid, 3,5-dihydroxyaniline, and 3,5-dicarboxyaniline.
- Aromatic amines such as 2′-bis [4- (4-aminophenoxy) phenyl] propane, 4,4′-diaminodiphenylsulfone, and guanamine compounds. These may be used alone or in combination of two or more.
- p-aminophenol 3,3′-diethyl-4,4′-diaminodiphenylmethane, and 2,2′-bis [4- (4-aminophenoxy) phenyl] propane are preferred.
- These amine compounds are preferably prepared as a prepolymer by reacting with the unsaturated imide resin in an organic solvent before blending, if necessary.
- the organic solvent and reaction catalyst used in this reaction are the same as the organic solvent and reaction catalyst used for prepolymerization of the silicone oil and the thermosetting resin.
- curing accelerators include, for example, zinc naphthenate, cobalt naphthenate, tin octylate, cobalt octylate, bisacetylacetonate cobalt (II), trisacetylacetonate cobalt (III), zinc (II)
- Organometallic salts and organometallic complexes such as acetylacetonate and iron (III) acetylacetonate, imidazoles and derivatives thereof, organophosphorus compounds, secondary amines, tertiary amines, and quaternary ammonium salts These can be used, and one or more of these can be mixed and used.
- organometallic salts and organometallic complexes from the viewpoint of curability and solvent solubility, bisacetylacetonate cobalt (II), trisacetylacetonate cobalt (III), zinc (II) acetylacetonate, zinc naphthenate and Iron (III) acetylacetonate is preferred, and bisacetylacetonate cobalt (II) and zinc naphthenate are particularly preferred.
- imidazoles and derivatives thereof an isocyanate resin represented by the following general formula (I) and a compound represented by the following general formula (II) are cured and molded at a relatively low temperature of 200 ° C. or less due to catalytic activity. It is preferable because of its excellent stability over time of varnish and prepreg. Further, the compound represented by the following formula (III) or formula (IV) may be used in a small amount, and is preferred because it is commercially inexpensive.
- R 1 , R 2 , R 3 and R 4 each independently represent a hydrogen atom, an aliphatic hydrocarbon group having 1 to 5 carbon atoms, or a phenyl group
- D represents a single bond, an alkylene group, an alkylidene group, It represents either an ether group or a sulfonyl group.
- R 5 to R 8 are the same as R 1 to R 4 .
- B is a residue of an isocyanate resin such as an alkylene group or an aromatic hydrocarbon group.
- the use amount of the curing accelerator is preferably 0.1 to 10 parts by mass, more preferably 0.1 to 5 parts by mass, based on 100 parts by mass of the total resin amount in terms of solid content.
- the amount is particularly preferably 1 to 1 part by mass.
- an inorganic filler can be arbitrarily used in the thermosetting resin composition in the present invention.
- Inorganic fillers include silica, alumina, talc, mica, kaolin, aluminum hydroxide, boehmite, magnesium hydroxide, zinc borate, zinc stannate, zinc oxide, titanium oxide, boron nitride, calcium carbonate, barium sulfate, and boron.
- glass powders such as aluminum oxide, potassium titanate, E glass, T glass, and D glass, and hollow glass beads, and these can be used alone or in combination.
- silica is particularly preferable from the viewpoints of dielectric properties, heat resistance, and low thermal expansion.
- Examples of the silica include a precipitated silica produced by a wet method and having a high water content, and a dry method silica produced by a dry method and containing almost no bound water.
- the dry method silica further includes differences in production methods. Examples include crushed silica, fumed silica, and fused spherical silica. Among these, fused spherical silica is preferable because of its low thermal expansion and high fluidity when filled in a resin.
- the average particle size is preferably 0.1 to 10 ⁇ m, and more preferably 0.3 to 8 ⁇ m.
- the average particle size is a particle size at a point corresponding to a volume of 50% when a cumulative frequency distribution curve based on the particle size is obtained with the total volume of the particles being 100%, and the laser diffraction scattering method is used.
- the content of the inorganic filler is preferably 20 to 300 parts by mass, more preferably 50 to 200 parts by mass, per 100 parts by mass of the total resin amount in terms of solid content.
- thermosetting resin composition in the present invention can be arbitrarily used in combination with a known thermoplastic resin, elastomer, flame retardant, organic filler and the like.
- thermoplastic resin include polytetrafluoroethylene, polyethylene, polypropylene, polystyrene, polyphenylene ether resin, phenoxy resin, polycarbonate resin, polyester resin, polyamide resin, polyimide resin, xylene resin, petroleum resin, and silicone resin.
- elastomer include polybutadiene, polyacrylonitrile, epoxy-modified polybutadiene, maleic anhydride-modified polybutadiene, phenol-modified polybutadiene, and carboxy-modified polyacrylonitrile.
- organic fillers include silicone powder, tetrafluoroethylene, polyethylene, polypropylene, polystyrene, and polyphenylene ether organic powders.
- thermosetting resin composition of the present invention can be added with an ultraviolet absorber, an antioxidant, a photopolymerization initiator, a fluorescent brightening agent, an adhesion improver, and the like, and is not particularly limited.
- UV absorbers such as benzotriazoles, antioxidants such as hindered phenols and styrenated phenols, photopolymerization initiators such as benzophenones, benzyl ketals, and thioxanthones, and fluorescence such as stilbene derivatives.
- UV absorbers such as benzotriazoles, antioxidants such as hindered phenols and styrenated phenols
- photopolymerization initiators such as benzophenones, benzyl ketals, and thioxanthones
- fluorescence such as stilbene derivatives.
- brighteners urea compounds such as urea silane, and adhesion improvers for silane coupling agents.
- the prepreg of the present invention is obtained by coating the above-described thermosetting resin composition on a substrate.
- organic solvent used here examples include alcohol solvents such as methanol, ethanol, propanol, butanol, methyl cellosolve, butyl cellosolve, and propylene glycol monomethyl ether; ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; butyl acetate Ester solvents such as propylene glycol monomethyl ether acetate; ether solvents such as tetrahydrofuran; aromatic solvents such as toluene, xylene and mesitylene; nitrogen atom-containing solvents such as dimethylformamide, dimethylacetamide and N-methylpyrrolidone; dimethyl sulfoxide Examples thereof include sulfur atom-containing solvents such as 1 type or 2 or more types.
- methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, and propylene glycol monomethyl ether are preferable from the viewpoint of low toxicity and solubility, and methyl ethyl ketone and propylene glycol monomethyl ether are preferable because they are highly volatile and hardly remain as residual solvents during the production of prepreg. More preferred.
- the prepreg of the present invention can be produced by coating the above varnish on a substrate and then semi-curing (B-stage) by heating or the like. More specifically, after coating on the substrate such that the amount of the resin composition attached to the substrate is 20 to 90% by mass in terms of the resin content of the prepreg after drying, it is usually 100 to 200.
- the prepreg of the present invention can be obtained by heating and drying at a temperature of 1 to 30 minutes and semi-curing (B-stage).
- the laminate in the present invention can be formed by laminate molding using the prepreg of the present invention described above.
- the prepreg of the present invention can be produced, for example, by laminating and forming 1 to 20 sheets, and laminating and forming a metal foil such as copper and aluminum on one or both sides thereof.
- the metal foil is not particularly limited as long as it is used for electrical insulating material applications.
- a laminated plate for an electrical insulating material and a multilayer plate method can be applied as the molding conditions.
- a multistage press a multistage vacuum press, a continuous molding machine, an autoclave molding machine is used, and a temperature of 100 to Molding can be performed at 250 ° C., a pressure of 2 to 100 kgf / cm 2 , and a heating time of 0.1 to 5 hours.
- the printed wiring board in the present invention is manufactured by forming a circuit on the surface of the laminated board. That is, the conductor layer of the laminated board according to the present invention is subjected to wiring processing by a normal etching method, and a plurality of laminated boards subjected to wiring processing through the above-described prepreg are laminated and subjected to hot press processing to be multilayered at once. Thereafter, a multilayer printed wiring board can be manufactured through formation of a through hole or blind via hole by drilling or laser processing and formation of an interlayer wiring by plating or conductive paste.
- Tg glass transition temperature
- thermosetting resin composition was applied onto polyethylene terephthalate (PET) using a desktop coating machine so that the resin thickness after drying would be 35 to 45 ⁇ m. did. After the application, it was heated and dried at 180 ° C. for 1 hour using an explosion-proof dryer to obtain a semi-cured product.
- ii Ion milling treatment The surface of the semi-cured product was subjected to ion milling treatment using Ar gas.
- iii SEM observation The surface shape of the semi-cured material subjected to the ion milling treatment was observed using the SEM because the morphology can be observed from the difference in the etching rate (see FIGS. 1 and 2).
- Examples 1 to 18 and Comparative Examples 1 to 6 Modified silicone oil, thermosetting resin, curing agent, inorganic filler, curing accelerator, and dilution solvent shown below, using methyl ethyl ketone as the mixing solvent, mixing at the blending ratio (parts by mass) shown in Table 1 A uniform varnish of 65% by weight was obtained. Next, the varnish was applied to an E glass cloth and a T glass cloth having a thickness of 0.05 mm and dried by heating at 160 ° C. for 10 minutes to obtain a prepreg having a resin content of 54 mass%. Two pieces of this prepreg were stacked, 12 ⁇ m electrolytic copper foils were placed one above the other, and pressed at a pressure of 2.5 MPa and a temperature of 240 ° C. for 60 minutes to obtain a copper-clad laminate. Table 2 shows the measurement and evaluation results of the obtained copper-clad laminate.
- X-22-163A Epoxy-modified silicone at both ends (manufactured by Shin-Etsu Chemical Co., Ltd .; trade name)
- X-22-161A Both-end amine-modified silicone [manufactured by Shin-Etsu Chemical Co., Ltd .; trade name]
- X-22-1821 Both-end phenol-modified silicone (manufactured by Shin-Etsu Chemical Co., Ltd .; trade name)
- KF-6003 Carbinol-modified silicone at both ends (manufactured by Shin-Etsu Chemical Co., Ltd .; trade name)
- FZ-2162 Side chain polyether-modified silicone (manufactured by Toray Dow Corning Co., Ltd .; trade name)
- X-22-164C methacryl-modified silicone at both ends [manufactured by Shin-Etsu Chemical Co., Ltd .; trade name]
- X-22-167B Both-end mercapto
- a laminate produced by laminating the prepreg of the present invention and a multilayer printed wiring board produced using the laminate are excellent in glass transition temperature, coefficient of thermal expansion, solder heat resistance, warpage, and electronic properties. It is useful as a printed wiring board for equipment.
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Abstract
Description
プリント配線板用積層板は、エポキシ樹脂等を主剤とした樹脂組成物をガラス織布に塗工してプリプレグを得、これを一枚以上積層し、銅箔を配置し、プレスによって熱硬化したものが一般的である。エポキシ樹脂は、一般に絶縁性や耐熱性、コスト等のバランスに優れるが、熱膨張率が大きいため、芳香環を有するエポキシ樹脂の選択やシリカ等の無機充填材を高充填化することで低熱膨張化を図っている(特許文献1、2参照)。無機充填材を高い割合で充填することにより、さらなる低熱膨張率化を図ることも可能であるが、無機充填材の充填量を増やすことは吸湿による絶縁信頼性の低下や樹脂組成物層-配線層間の密着力の不足、プレス成形不良を起こすことが知られている。他にも、シリコーン重合体を用いることにより、無機充填材を均一に分散させ、高充填化する方法が知られている(特許文献3参照)。しかし、多層配線板における用途では、無機充填材の高充填化での低熱膨張率化には限界があった。
また、上記低熱膨張率化を行った場合でも、製造過程における内部応力によって、はんだ実装時にはそりを生じ、接続不良となる場合があった。
すなわち、本発明は、
(1)繊維基材及び熱硬化性樹脂組成物の層を含んでなるプリプレグにおいて、熱硬化性樹脂組成物の層が変性シリコーンオイル又は変性シリコーンオイル由来の骨格を有する化合物を含み、かつ前記熱硬化性樹脂組成物の層が相分離構造を有することを特徴とするプリプレグ、
(2)前記熱硬化性樹脂組成物の層の観察面の単位面積当たりの島部分の占める面積比率が10%以上45%以下である上記(1)に記載のプリプレグ、
(3)前記変性シリコーンオイル又は変性シリコーンオイル由来の骨格を有する化合物が分子構造中にジメチルシリコーン骨格を有する上記(1)又は(2)に記載のプリプレグ、
(4)前記変性シリコーンオイル又は変性シリコーンオイル由来の骨格を有する化合物が分子構造中に反応性基を有する上記(1)~(3)のいずれかに記載のプリプレグ、
(5)前記変性シリコーンオイル又は変性シリコーンオイル由来の骨格を有する化合物の配合量が、前記熱硬化性樹脂組成物を構成する熱硬化性樹脂及び所望により添加される硬化剤の配合量の総量100質量部に対して、2質量部以上80質量部以下である上記(1)~(4)のいずれかに記載のプリプレグ、
(6)前記繊維基材がガラスクロスである上記(1)~(5)のいずれかに記載のプリプレグ、
(7)前記熱硬化性樹脂組成物がエポキシ樹脂、シアネート樹脂又はビスマレイミド樹脂を含有する上記(1)~(6)のいずれかに記載のプリプレグ、
(8)前記熱硬化性樹脂組成物が、無機充填材を含有する上記(1)~(7)のいずれかに記載のプリプレグ、
(9)電子顕微鏡を用いた表面観察において、2000倍で相分離構造が確認可能である上記(1)~(7)のいずれかに記載のプリプレグ、
(10)電子顕微鏡を用いた表面観察において、2000倍では相分離構造が確認出来ず、10000倍で相分離構造が確認可能である程度に微細な相分離構造を有する、上記(1)~(7)のいずれかに記載のプリプレグ、
(11)電子顕微鏡を用いた2000倍の表面観察において、相分離スケールが1.0μm以上である島部分が、20μm×20μm辺りに5個以上である上記(9)に記載のプリプレグ、
(12)電子顕微鏡を用いた10000倍の表面観察において、相分離スケールが20nm以上である島部分が、200nm×200nm辺りに2個以上である上記(9)に記載のプリプレグ、
(13)上記(1)~(12)のいずれかに記載のプリプレグを用いて積層成形されてなる積層板、及び
(14)上記(13)に記載の積層板を用いて製造されてなるプリント配線板、
である。
また、繊維基材の厚さとしては、特に制限されず、例えば、約0.03~0.5mmのものを使用することができ、シランカップリング剤等で表面処理したもの又は機械的に開繊処理を施したものが、耐熱性や耐湿性、加工性の面から好適である。
変性シリコーンオイル等は、島、海部分の、どちらに含まれていても良いが、積層板とした場合のピール強度の点や化学粗化後の表面粗さの点から、島部分に含まれていることが好ましい。また、顕著な低熱膨張率化という観点からは、海部分に含まれていることが好ましい。また、本発明の島部分と海部分は、弾性率が異なることが好ましい。そして、島部分が海部分と比較して、低弾性であり、海部分が高弾性な場合、基板全体として高弾性化が可能である。また、島部分が海部分と比較して高弾性であり、海部分が低弾性な場合、基板全体として低熱膨張率となる。それぞれの目的によって構成を変更することが好ましい。
図1及び図2にSEMでの観察結果を示す。本発明では、上記構造の中で、球状構造を示すものが多く、本願発明の効果を達成する点で好ましい。なお、表面を観察するに際し、表面での相分離構造の確認が困難な場合には、イオンミリングなどで表面の層を削ることによって、相分離の確認が容易となる。
本発明は、剛直であり高弾性な樹脂と、柔軟で低弾性であるシリコーンオイルを併用することによって、高弾性な部分と低弾性な部分を有する相分離構造となり、応力を緩和し、低熱膨張率化に寄与し、そりを抑制することが可能である。
まず、図1に、SEMを用いて2000倍で表面観察した結果を示す。このように、相分離構造の確認には、2000倍程度の倍率での観察が適当であり、2000倍での表面観察で相分離構造が観察される場合には、相分離スケールが1.0μm以上である島部分が、20μm×20μm辺りに5個以上であることが好ましい。
次に、図2に、SEMを用いて10000倍で表面観察した図を示す。2000倍では相分離構造が確認出来ない場合には、10000倍で観察することが好ましい。10000倍で相分離構造が確認可能である程度に微細な相分離構造を有する場合には、相分離スケールが20nm以上である島部分が、200nm×200nm辺りに2個以上であることが好ましい。
なお、ここで相分離スケールとは、図1及び図2に示すように、島部分の最大径をいう。通常、島部分は球状を示すことが多く、その場合には球の直径を意味する。
また、本発明においては、熱硬化性樹脂組成物に配合して使用される一般的な有機又は無機充填材は島部分とは見なさない。
(a)熱硬化性樹脂組成物を、例えば、ガラス板、金属板又はポリエチレンテレフタレート等の樹脂製の支持体上に、乾燥後の樹脂厚が35~45μmとなるように塗布し、加熱・乾燥し、半硬化物を得る。
(b)半硬化物の表面を、アルゴンガスを用いてイオンミリング処理を行う。
(c)走査型電子顕微鏡による表面観察を行う。
支持体としては、特に制限はなく、汎用のものを使用することができ、また、塗布の方法としても特に制限はなく、通常の卓上塗工機を用いて塗布すればよい。
乾燥についても、通常の防爆乾燥機を用いて乾燥することができ、特に制限されない。
本発明において、充填材の存在によって、相分離構造が確認困難である場合、熱硬化性樹脂組成物の配合において、充填材以外のものを上記の様に塗布乾燥して、観察することができる。
反応性基としては、ポリシロキサンの側鎖の一部に導入されたものであってもよいし、ポリシロキサンの片末端又は両末端に導入されたものであってもよいし、ポリシロキサンの側鎖に加えて、片末端又は両末端に導入されたものであってもよい。
分子構造中にエポキシ基を有するシリコーンオイルは、市販品を用いることができ、例えば、両末端にエポキシ基を有する「X-22-163」(官能基当量200)、「KF-105」(官能基当量490)、「X-22-163A」(官能基当量1000)、「X-22-163B」(官能基当量1750)、「X-22-163C」(官能基当量2700)、両末端に脂環式エポキシ基を有する「X-22-169AS」(官能基当量500)、「X-22-169B」(官能基当量1700)、一方の末端にエポキシ基を有する「X-22-173DX」(官能基当量4500)、側鎖及び両末端にエポキシ基を有する「X-22-9002」(官能基当量5000)、側鎖にエポキシ基を有する「X-22-343」(官能基当量525)、「KF-101」(官能基当量350)、「KF-1001」(官能基当量3500)、「X-22-2000」(官能基当量620)、「X-22-4741」(官能基当量2500)、「KF-1002」(官能基当量4300)、側鎖に脂環式エポキシ基を有する「X-22-2046」(官能基当量600)及び「KF-102」(官能基当量3600、以上、信越化学工業(株)製)が挙げられ、これらは単独で、又は2種類以上を混合して、さらには各種エポキシ樹脂と混合して使用することができる。
分子構造中にメルカプト基を有するシリコーンオイルは、市販品を用いることができ、例えば、両末端にメルカプト基を有する「X-22-167B」(官能基当量1670)、側鎖にメルカプト基を有する「KF-2001」(官能基当量1900)、「KF-2004」(官能基当量30000)、(以上、信越化学工業(株)製)が挙げられ、 これらは単独で、あるいは2種類以上を混合して用いてもよい。
これらのうち、特にエポキシ基、アミノ基又は水酸基で変性されたシリコーンオイルが好ましい。これらの中で、反応性の点から両末端変性シリコーンが好ましく、相溶性の点から官能基当量5000以下のものがより好ましい。
また、シアネート樹脂としては、例えば、ノボラック型シアネート樹脂、ビスフェノールA型シアネート樹脂、ビスフェノールE型シアネート樹脂、テトラメチルビスフェノールF型シアネート樹脂のビスフェノール型シアネート樹脂およびこれらが一部トリアジン化したプレポリマーを挙げることができ、これらは単独で、あるいは2種類以上を混合して使用してもよい。これらの中で耐熱性、難燃性の点からノボラック型シアネート樹脂が好ましい。
(1)変性シリコーンオイルがほとんどを占める場合、
(2)変性シリコーンオイルと変性シリコーンオイルが熱硬化性樹脂と反応して、生成した化合物が占める場合、
(3)変性シリコーンオイルが熱硬化性樹脂と反応して、生成した化合物がほとんどを占める場合、
である。
本発明における変性シリコーンオイル由来の骨格を有する化合物とは、上記(2)及び(3)における、変性シリコーンオイルが熱硬化性樹脂と反応して、生成した化合物を主に指す。係る化合物は、通常プリプレグ製造時に生成するが、プリプレグ製造時のみではなく、あらかじめ生成させることもできる。
あらかじめ生成させる方法としては、熱硬化性樹脂とシリコーンオイルを配合前に有機溶剤中で反応させ、プレポリマーとして調製することが好ましい。
この反応で使用される有機溶剤は特に制限されないが、例えばエタノール、プロパノール、ブタノール、メチルセロソルブ、ブチルセロソルブ、プロピレングリコールモノメチルエーテル等のアルコール系溶剤;アセトン、メチルエチルケトン、メチルイソブチルケトン、シクロヘキサノン等のケトン系溶剤;酢酸エチルエステルやγ-ブチロラクトン等のエステル系溶剤;テトラヒドロフラン等のエーテル系溶剤;トルエン、キシレン、メシチレン等の芳香族系溶剤;ジメチルホルムアミド、ジメチルアセトアミド、N-メチルピロリドン等の窒素原子含有溶剤;ジメチルスルホキシド等の硫黄原子含有溶剤が挙げられ、1種又は2種以上を混合して使用できる。これらの有機溶剤の中で、溶解性の点からシクロヘキサノン、プロピレングリコールモノメチルエーテル、メチルイソブチルケトン、トルエン及びジメチルアセトアミドが好ましく、揮発性が高く残溶剤として残りにくい点から、プロピレングリコールモノメチルエーテル、トルエン及びジメチルアセトアミドが特に好ましい。
また、この反応には任意に反応触媒を使用することができ、反応触媒として一般に使用されるものであれば、特に限定されない。反応触媒の例としては、ナフテン酸亜鉛、ナフテン酸コバルト、オクチル酸スズ、オクチル酸コバルト、ビスアセチルアセトナートコバルト(II)、トリスアセチルアセトナートコバルト(III)等の有機金属塩及び有機金属錯体、イミダゾール類及びその誘導体、有機リン系化合物、第二級アミン類、第三級アミン類及び第四級アンモニウム塩などが挙げられ、これらの1種又は2種以上を混合して使用できる。
多官能フェノール化合物としては、例えば、フェノール、クレゾール類、エチルフェノール類、ブチルフェノール類、オクチルフェノール類、ビスフェノールA、ビスフェノールF、ビスフェノールS、ナフトール類などの各種フェノールを原料とするノボラック樹脂、キシリレン骨格含有フェノールノボラック樹脂、ジシクロペンタジエン骨格含有フェノールノボラック樹脂、ビフェニル骨格含有フェノールノボラック樹脂及びフルオレン骨格含有フェノールノボラック樹脂の各種ノボラック樹脂が挙げられる。
これらアミン化合物は必要に応じて前記不飽和イミド樹脂と配合前に有機溶剤中で反応させ、プレポリマーとして調製することが好ましい。この反応で使用される有機溶剤及び反応触媒は、前記シリコーンオイルと熱硬化性樹脂のプレポリマー化に使用される有機溶剤及び反応触媒と同様である。
有機金属塩及び有機金属錯体としては、硬化性、溶剤溶解性の観点から、ビスアセチルアセトナートコバルト(II)、トリスアセチルアセトナートコバルト(III)、亜鉛(II)アセチルアセトナート、ナフテン酸亜鉛及び鉄(III)アセチルアセトナートが好ましく、特にビスアセチルアセトナートコバルト(II)、ナフテン酸亜鉛が好ましい。
イミダゾール類及びその誘導体としては、下記一般式(I)で表されるイソシアネート樹脂や、下記一般式(II)で表される化合物が、触媒活性によって、200℃以下という比較的低温での硬化成形性が可能であり、さらにワニスやプリプレグの経日安定性に優れるため好ましい。また、下記式(III)又は式(IV)で表される化合物が少量の配合使用でよく、また商業的にも安価であることから好ましい。
これらの中で、誘電特性、耐熱性、低熱膨張性の点からシリカが特に好ましい。シリカとしては、例えば、湿式法で製造され含水率の高い沈降シリカと、乾式法で製造され結合水等をほとんど含まない乾式法シリカが挙げられ、乾式法シリカとしてはさらに、製造法の違いにより破砕シリカ、フュームドシリカ、溶融球状シリカが挙げられる。これらの中で、低熱膨張性及び樹脂に充填した際の高流動性から溶融球状シリカが好ましい。
無機充填材の含有量は、固形分換算の全樹脂量の総和100質量部当たり20~300質量部であることが好ましく、50~200質量部であることがより好ましい。無機充填材の含有量を樹脂成分の総和100質量部当たり20~300質量部にすることで、プリプレグの成形性と低熱膨張性を良好に保つことができる。
熱可塑性樹脂の例としては、ポリテトラフルオロエチレン、ポリエチレン、ポリプロピレン、ポリスチレン、ポリフェニレンエーテル樹脂、フェノキシ樹脂、ポリカーボネート樹脂、ポリエステル樹脂、ポリアミド樹脂、ポリイミド樹脂、キシレン樹脂、石油樹脂及びシリコーン樹脂が挙げられる。
エラストマーの例としては、ポリブタジエン、ポリアクリロニトリル、エポキシ変性ポリブタジエン、無水マレイン酸変性ポリブタジエン、フェノール変性ポリブタジエン及びカルボキシ変性ポリアクリロニトリル等が挙げられる。
有機充填材の例としては、シリコーンパウダー、テトラフルオロエチレン、ポリエチレン、ポリプロピレン、ポリスチレン、並びにポリフェニレンエーテルの有機物粉末等が挙げられる。
この際用いる有機溶剤としては、例えば、メタノール、エタノール、プロパノール、ブタノール、メチルセロソルブ、ブチルセロソルブ、プロピレングリコールモノメチルエーテル等のアルコール系溶剤;アセトン、メチルエチルケトン、メチルイソブチルケトン、シクロヘキサノン等のケトン系溶剤;酢酸ブチル、プロピレングリコールモノメチルエーテルアセテート等のエステル系溶剤;テトラヒドロフラン等のエーテル系溶剤;トルエン、キシレン、メシチレン等の芳香族系溶剤;ジメチルホルムアミド、ジメチルアセトアミド、N-メチルピロリドン等の窒素原子含有溶剤;ジメチルスルホキシド等の硫黄原子含有溶剤が挙げられ、1種又は2種以上を混合して使用できる。これらの中で、低毒性、溶解性の点からメチルエチルケトン、メチルイソブチルケトン、シクロヘキサノン、プロピレングリコールモノメチルエーテルが好ましく、揮発性が高くプリプレグの製造時に残溶剤として残りにくい点からメチルエチルケトン、プロピレングリコールモノメチルエーテルがより好ましい。
より具体的には、基材に対する樹脂組成物の付着量が、乾燥後のプリプレグの樹脂含有率で、20~90質量%となるように、基材に塗工した後、通常、100~200℃の温度で1~30分加熱乾燥し、半硬化(Bステージ化)させて、本発明のプリプレグを得ることができる。
なお、各実施例および比較例で得られた積層板を用いて、ガラス転移温度、熱膨張率、銅付きはんだ耐熱性、そり特性について以下の方法で測定・評価した。
銅張積層板を銅エッチング液に浸漬することにより銅箔を取り除いた5mm角の評価基板を作製し、TMA試験装置(デュポン社製、TMA2940)を用いて圧縮法で熱機械分析をおこなった。評価基板を前記装置にZ方向に装着後、荷重5g、昇温速度10℃/分の測定条件にて連続して2回測定した。2回目の測定における熱膨張曲線の異なる接線の交点で示されるTgを求め、耐熱性を評価した。
(2)熱膨張率の測定
銅張積層板を銅エッチング液に浸漬することにより銅箔を取り除いた5mm角の評価基板を作製し、TMA試験装置(デュポン社製、TMA2940)を用いて圧縮法で熱機械分析をおこなった。評価基板を前記装置にX方向に装着後、荷重5g、昇温速度10℃/分の測定条件にて連続して2回測定した。2回目の測定における30℃から100℃までの平均熱膨張率を算出し、これを熱膨張率の値とした。これは、精度を向上させるため、2回目の測定結果を用いる。
銅張積層板から25mm角の評価基板を作製し、温度288℃のはんだ浴に、120分間評価基板をフロートし、外観を観察することにより銅付きはんだ耐熱性を評価した。
(4)そり量の評価
AKROMETRIX社製 サーモレイPS200シャドーモアレ分析を用いて、基板のそり量を評価した。基板のサンプルサイズは40mm×40mmとし、測定エリアは36mm×36mmとした。室温から260℃まで加熱し、その後50℃まで冷却した時のそり量を測定した。
(5)SEMによる観察
i:半硬化物の作成方法
熱硬化性樹脂組成物を,卓上塗工機を用いてポリエチレンテレフタレート(PET)上に乾燥後の樹脂厚が35~45μmとなるように塗布した。塗布後、防爆乾燥機を用いて180℃で1時間加熱・乾燥し、半硬化物を得た。
ii:イオンミリング処理
半硬化物の表面を、Arガスを用いてイオンミリング処理を行った。
iii:SEM観察
イオンミリング処理した半硬化物の表面形状はエッチング速度の違いから、モルフォロジを観察できるため、SEMを用いて表面観察した(図1及び図2参照)。
以下に示す変性シリコーンオイル、熱硬化性樹脂、硬化剤、無機充填材、硬化促進剤、及び希釈溶剤にメチルエチルケトンを使用して、第1表に示した配合割合(質量部)で混合して樹脂分65質量%の均一なワニスを得た。
次に、上記ワニスを厚さ0.05mmのEガラスクロス及びTガラスクロスに塗工し、160℃で10分加熱乾燥して樹脂含有量54質量%のプリプレグを得た。
このプリプレグを2枚重ね、12μmの電解銅箔を上下に配置し、圧力2.5MPa、温度240℃で60分間プレスを行って、銅張積層板を得た。
得られた銅張積層板の測定・評価結果を第2表に示す。
X-22-163A:両末端エポキシ変性シリコーン〔信越化学工業(株)製;商品名〕
X-22-161A:両末端アミン変性シリコーン〔信越化学工業(株)製;商品名〕
X-22-1821:両末端フェノール変性シリコーン〔信越化学工業(株)製;商品名〕
KF-6003:両末端カルビノール変性シリコーン〔信越化学工業(株)製;商品名〕
FZ-2162:側鎖ポリエーテル変性シリコーン〔東レ・ダウコーニング(株)製;商品名〕
X-22-164C:両末端メタクリル変性シリコーン〔信越化学工業(株)製;商品名〕
X-22-167B:両末端メルカプト変性シリコーン〔信越化学工業(株)製;商品名〕
X-22-162C:両末端カルボキシル変性シリコーン〔信越化学工業(株)製;商品名〕
FZ-3704:側鎖アルコキシ変性シリコーン〔東レ・ダウコーニング(株)製;商品名〕
KF-9701:両末端シラノール変性シリコーン〔信越化学工業(株)製;商品名〕
PT-30:ノボラック型シアネート樹脂〔ロンザジャパン(株)製、商品名〕
NC-7000L:α-ナフトール型エポキシ樹脂〔日本化薬(株)製;商品名〕
BMI:ビス(4-マレイミドフェニル)メタン〔ケイ・アイ化成(株)製;商品名〕
(硬化剤)
KA-1165:クレゾールノボラック樹脂〔大日本インキ化学工業(株)製、商品名〕
KAYAHARD A-A:3、3’-ジエチル-4、4’-ジアミノジフェニルメタン〔日本化薬製;商品名〕
p-アミノフェノール〔関東化学(株)製〕
(無機充填材)
SC2050-KNK:溶融シリカ〔アドマテック(株)製、商品名〕
BMT-3LVベーマイト〔河合石灰工業(株)製、商品名〕
(硬化促進剤)
ナフテン酸亜鉛(II):ナフテン酸亜鉛8%ミネラルスピリット溶液〔東京化成(株)製〕
G-8009L:イソシアネートマスクイミダゾール〔第一工業製薬(株)製、商品名〕
20 島構造部分
30 海構造部分
Claims (14)
- 繊維基材及び熱硬化性樹脂組成物の層を含んでなるプリプレグにおいて、熱硬化性樹脂組成物の層が変性シリコーンオイル又は変性シリコーンオイル由来の骨格を有する化合物を含み、かつ該熱硬化性樹脂組成物の層が相分離構造を有することを特徴とするプリプレグ。
- 前記熱硬化性樹脂組成物の層の観察面の単位面積当たりの島部分の占める面積比率が10%以上45%以下である請求項1に記載のプリプレグ。
- 前記変性シリコーンオイル又は変性シリコーンオイル由来の骨格を有する化合物が分子構造中にジメチルシリコーン骨格を有する請求項1又は2に記載のプリプレグ。
- 前記変性シリコーンオイル又は変性シリコーンオイル由来の骨格を有する化合物が分子構造中に反応性基を有する請求項1~3のいずれかに記載のプリプレグ。
- 前記変性シリコーンオイル又は変性シリコーンオイル由来の骨格を有する化合物の配合量が、前記熱硬化性樹脂組成物を構成する熱硬化性樹脂及び所望により添加される硬化剤の配合量の総量100質量部に対して、2質量部以上80質量部以下である請求項1~4のいずれか1項に記載のプリプレグ。
- 前記繊維基材がガラスクロスである請求項1~5のいずれか1項に記載のプリプレグ。
- 前記熱硬化性樹脂組成物がエポキシ樹脂、シアネート樹脂又はビスマレイミド樹脂を含有する請求項1~6のいずれか1項に記載のプリプレグ。
- 前記熱硬化性樹脂組成物が、無機充填材を含有する請求項1~7のいずれか1項に記載のプリプレグ。
- 電子顕微鏡を用いた表面観察において、2000倍で相分離構造が確認可能である、請求項1~8のいずれか1項に記載のプリプレグ。
- 電子顕微鏡を用いた表面観察において、2000倍では相分離構造が確認出来ず、10000倍で相分離構造が確認可能である程度に微細な相分離構造を有する、請求項1~8のいずれか1項に記載のプリプレグ。
- 電子顕微鏡を用いた2000倍の表面観察において、相分離スケールが1.0μm以上である島部分が、20μm×20μm辺りに5個以上である請求項9に記載のプリプレグ。
- 電子顕微鏡を用いた10000倍の表面観察において、相分離スケールが20nm以上である島部分が、200nm×200nm辺りに2個以上である請求項10に記載のプリプレグ。
- 請求項1~12のいずれか1項に記載のプリプレグを用いて積層成形されてなる積層板。
- 請求項13に記載の積層板を用いて製造されてなるプリント配線板。
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TWI690248B (zh) | 2020-04-01 |
JP2018048347A (ja) | 2018-03-29 |
CN103328549A (zh) | 2013-09-25 |
KR20140016882A (ko) | 2014-02-10 |
TWI640228B (zh) | 2018-11-01 |
CN107200859B (zh) | 2021-02-05 |
EP2666806A1 (en) | 2013-11-27 |
TW201825565A (zh) | 2018-07-16 |
TWI726270B (zh) | 2021-05-01 |
KR101914917B1 (ko) | 2018-11-05 |
JPWO2012099131A1 (ja) | 2014-06-30 |
JP6658721B2 (ja) | 2020-03-04 |
CN107200859A (zh) | 2017-09-26 |
TW201251530A (en) | 2012-12-16 |
JP6255668B2 (ja) | 2018-01-10 |
JP2016104882A (ja) | 2016-06-09 |
KR102039874B1 (ko) | 2019-11-04 |
CN103328549B (zh) | 2017-05-03 |
TW201922068A (zh) | 2019-06-01 |
KR20180121679A (ko) | 2018-11-07 |
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