JPH0577705B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a flame-retardant polyphenylene oxide resin composition and a metal-clad laminate using the same. More specifically, the present invention relates to a flame-retardant polyphenylene oxide resin composition that has low dielectric constant properties and excellent flame retardancy, and is useful as a wiring board used in electrical equipment, electronic equipment, etc. This relates to metal-clad laminates. (Conventional technology) For wiring boards used in precision instruments, electronic computers, communication devices, etc., there are increasing demands for faster calculation processing, higher reliability, higher circuit density, and smaller size. In order to meet these demands, wiring boards are rapidly becoming more multi-layered and more precisely miniaturized. Conventionally, such wiring boards have been made of epoxy resin, polyimide resin, or
Fluorine resins, polybutadiene resins, and the like have been used as low dielectric constant resins, and efforts have been made to improve their properties. (Problems to be Solved by the Invention) However, such conventional resins have not been able to fully satisfy various characteristics required for high-density multilayer wiring boards. For example, as the density of wiring increases, flame retardancy becomes an essential condition for resins used in multilayer wiring boards. However, conventional resins are generally flammable. Therefore, usually
Flame retardants are added to the resin used for wiring boards in order to efficiently and reliably make it flame retardant. However, even if the resin itself has a low dielectric constant, adding a flame retardant increases the resin dielectric constant, making it impossible to meet the high-speed signal processing required by measuring instruments and computer-related equipment. For this reason, we have created a new resin composition for laminates that can stably perform high-speed signal processing with a low dielectric constant, has excellent flame retardancy, and can increase the density of multilayer wiring, and laminates using the same. The realization of a board was strongly desired. This invention was made in order to solve the problems of conventional laminates as described above, and it is an object of the present invention to provide a resin composition that has a low dielectric constant and is flame retardant.
and to provide a laminate using the same. (Means for Solving the Problems) In order to achieve this object, the present invention provides polyphenylene oxide, a crosslinkable polymer and a crosslinkable monomer, a flame retardant or a flame retardant and a flame retardant aid,
A flame retardant resin composition further containing a reaction initiator if necessary, wherein <1> the crosslinkable polymer is at least polytrialyl isocyanurate or polytriallyl cyanurate having a number average molecular weight of 10,000 or less; <2> As a crosslinking monomer, triallyl isocyanurate or triallyl cyanurate; <3> As a flame retardant, brominated diphenyl ether, brominated bisphenol, brominated polycarbonate, and Provided is a flame-retardant polyphenylene oxide-based resin composition for electrical laminates, characterized in that it contains one or more selected from brominated cyanuric acid-based flame retardants. In addition, as a laminate using this, this invention includes:
A flame-retardant polyphenylene oxide-based metal characterized by forming a sheet and/or prepreg from the flame-retardant polyphenylene oxide-based resin composition, and laminating and integrating the sheet/or prepreg with metal foil. Provides tension laminates. The polyphenylene oxide used in the flame-retardant polyphenylene oxide resin composition of this invention has a relatively high glass transition point, low dielectric constant, and low dielectric loss, and has attracted attention in recent years because it is inexpensive. This is what is being done. However, until now, it has not been possible to improve the flame retardance of this resin, so it has not been put to practical use as a resin for high-density wiring boards. However, in this invention, by selectively using specific coexisting components of a flame retardant or a flame retardant and a flame retardant aid in a polyphenylene oxide resin composition, it is possible to improve flame retardancy while maintaining its low dielectric property. I'm finding out. That is, as mentioned above, when incorporating a flame retardant into the polyphenylene oxide resin composition, a specific organic brominated flame retardant is used,
Furthermore, we discovered that by coexisting a specific crosslinkable polymer and crosslinkable monomer, the flame retardance, chemical resistance, processability, and dimensional stability of the resin were also improved. Based on this knowledge, we The invention has been completed. The polyphenylene oxide used in this invention has, for example, the following general formula (1):

[R represents hydrogen or a hydrocarbon group having 1 to 3 carbon atoms, and each R may be the same or different. ] An example thereof is poly(2,6-dimethyl-1,4-phenylene oxide). Although its molecular weight is not particularly limited,
For example, it is preferable that the weight average molecular weight (Mw) is 50,000 and the molecular weight distribution Mw/Mn=4.2 (Mn is the number average molecular weight). Such polyphenylene oxide, for example, the above-mentioned poly(2,6-sidimethyl-1,4-phenylene oxide), is produced by oxidizing 2,6-xinnol with an oxygen-containing gas and methanol in the presence of a catalyst. It can be obtained by coupling reaction. Here, as a catalyst,
Contains copper(I) compounds, N,N'-di-tert-butylethylenediamine, butyldimethylamine and hydrogen bromide. Further, methanol is used by adding 2 to 15% by weight of water to the reaction mixture system so that the total amount of methanol and water is 5 to 25% by weight as a polymerization solvent. Examples of crosslinkable polymers include 1,2-
Examples include polybutadiene, 1,4-polybutadiene, styrene-butadiene copolymer, modified 1,2-polybutadiene (malein-modified, acrylic-modified, epoxy-modified), rubbers, polytriallyl in cyanurate, polytriallyl cyanurate, etc. , can be used alone or in combination of two or more. These polymers may be in the form of elastomers or rubbers. However, in this invention, in order to maintain and improve the properties for use in electrical laminates, when using the flame retardant, the crosslinkable polymer must have a number average molecular weight of at least 10,000.
It is essential to blend one of the following polytriallyl cyanurates or polytriallyl cyanurates. This polytriallyl isocyanurate or polytriallyl cyanurate can be synthesized by solution polymerization or bulk polymerization. In this case, solution polymerization has a milder reaction than bulk polymerization, and it is easier to adjust the molecular weight. It can be carried out by dissolving triallyl isocyanurate monomer or triallyl isocyanurate monomer in a solvent, mixing a radical initiator, reacting with stirring until an appropriate molecular weight is reached, and heating as necessary. can. At this time, it is preferable to carry out the reaction using a reflux vessel and in an atmosphere free of oxygen. The reaction atmosphere may be, for example, a nitrogen flowing atmosphere. Further, as the solvent, benzene, meluene, xylene, methanol, ethanol, acetone, methyl ethyl ketone, heptane, carbon tetrachloride, dichloromethane, trichloroethylene, etc. can be used. As the radical initiator, any suitable radical initiator can be used, including conventionally known ones, such as benzoyl peroxide, 2,5-dimethyl-2,5-di(benzoylperoxy)hexane, and t-butyl peroxide. Examples include oxybenzoate and dicumyl peroxide. For example, triallylisocyanurate prepolymer can be synthesized as follows. (Example 1) Add 11 g of benzoyl peroxide and 1087 g of benzene to 280 g of triallylisocyanurate monomer, and react for 6 hours while boiling under a nitrogen atmosphere using a reactor equipped with a stirrer and a reflux condenser.
After collecting benzene under reduced pressure, methanol is added,
The polymer is collected and dried under reduced pressure. 139 g of polymer was obtained. The number average molecular weight is approximately 10,000. (Example 2) Add 10 g of dicumyl peroxide and 527 g of toluene to 225 g of triallylisocyanurate, Example 1
A prepolymer is obtained in the same manner. The number average molecular weight is approximately 4000. For example, the number average molecular weight of triallyl isocyanurate or triallyl cyanurate prepolymer that can be synthesized as described above is
Must be 10,000 or less. If it exceeds this range, it becomes difficult to improve both flame retardancy and resin properties of the resin composition containing the flame retardant. In addition, the crosslinking monomer used in this invention is
In the curing process during the production of electrical laminates, it is characterized as a monomer that has network-crosslinking (cross-linking) reactivity with resin constituent components and also has polymerizability itself. Examples of crosslinkable monomers include acrylates such as ester acrylates, epoxy acrylates, urethane acrylates, ether acrylates, melamine acrylates, alkyd acrylates, and silicone acrylates, triallyl cyanurate, triallyl isocyanurate, Examples include polyfunctional monomers such as ethylene glycol dimethacrylate, divinylbenzene, and diallyl phthalate, monofunctional monomers such as vinyltoluene, ethylvinylbenzene, styrene, and paramethylstyrene, and polyfunctional epoxies, each of which may be used singly or in combination. The above can be used in combination. However, in this invention, the characteristics for use in electrical laminates are maintained,
In order to improve this, it is essential to blend at least one type of triallyl isocyanurate or triallyl isocyanurate as this crosslinking monomer. Triallyl isocyanurate or triallyl cyanurate has good compatibility with polyphenylene oxide and improves film forming properties, crosslinking properties, heat resistance, and dielectric properties. Triallyl cyanurate and triallyl isocyanurate are chemically structurally isomers and have almost the same film-forming properties, compatibility, solubility, reactivity, etc. Or both can be used equally. The flame retardant used in this invention is usually capable of reducing the dielectric constant of the polyphenylene oxide resin composition to 4.0 or less after adding the flame retardant together with the flame retardant aid, and the flame retardant property is UL94 rated. It is preferable to use a material whose characteristics can be V-1 or V-0 based on the flammability test method. For example, a brominated diphenyl ether system having the following formula (2)

[Chemical formula] (wherein R represents hydrogen, an aromatic group or an aliphatic group), or a brominated polycarbonate system having the following formula (3),

[Chemical formula] (wherein R represents hydrogen, an aromatic group or an aliphatic group), or a brominated bisphenol system having the following formula (4),

[Chemical formula] (wherein R ¹ and R ² are each hydrogen, an aromatic group, an aliphatic group, or the following formula
> represents a group represented by any of the following. <>-O-CH ₂ -CH=CH ₂ <>-O-CO-CH=CH ₂

[Formula] <>-O-CH ₂ -CH ₂ -O-CO-CH=CH ₂

[ka]

[Formula] Furthermore, a brominated cyanuric acid system having the following formula (5) can be exemplified.

[Chemical formula] These flame retardants may be used alone or in combination. In the present invention, a flame retardant aid may be used together with such a flame retardant as necessary, thereby producing a synergistic effect on flame retardation. As the flame retardant aid, for example, antimony oxide (antimony trioxide, antimony pentoxide), zirconium oxide, etc. can be used. These flame retardant aids may be used alone or in combination. These flame retardant aids may be used alone or in combination as flame retardants. In addition, when using antimony oxide, it is preferable to disperse it in an organic solvent for ease of handling. As the initiator, the following two types can be selected depending on whether the polyphenylene oxide resin composition is an ultraviolet curing type or a thermosetting type, but the initiator is not limited to these. Examples of ultraviolet curing photoinitiators (that is, those that generate radicals when exposed to ultraviolet rays) include benzoin, benzyl, allyldiazonium fluoroborate, benzyl methyl ketal, 2,2-diethoxyacetophenone, benzoyl isobutyl ether, p-tert-butyltrichloroacetophenone, benzyl(o-ethoxycarbonyl)-
α-Monoxime, biacetyl, acetophenone, benzophenone, Michler's ketone, ketoramethylthiuram sulfide, azobisisobutyronitrile, and the like can be used. Dicumyl peroxide is a thermosetting initiator (that is, one that generates radicals when heated). tert-butylcumyl peroxide, benzoyl peroxide, di-tert-butyl peroxide, 2,5-dimethyl-2,5-
di-(tert-butylperoxy)hexyne-3,
2,5-dimethyl-2,5-di-(tert-butylperoxy)hexane, α,α′-bis(tert-butylperoxy-m-isopropyl)benzene [1,4(or 1,3)- peroxides such as bis(tert-butylperoxyisopropyl)benzene], 1-hydroxycyclohexyl phenyl edone, 2-hydroxy-2-methyl-1-
Phenyl-propan-1-one, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropan-1-one, 2-chlorothioxanthone, methylbenzoylformate 4,4-bisdimethylaminobenzophenone (Michler ketone), benzoyl methyl ether, methyl-O-
Benzoyl benzoate, α-acyloxime ester, Biscumil manufactured by NOF Corporation, etc. can be used. These initiators may be used alone or in combination of two or more. Further, an initiator using ultraviolet rays and an initiator using heat may be used in combination. The above-mentioned blending ratios of polyphenylene oxide, crosslinkable polymer, crosslinkable monomer, flame retardant or flame retardant and flame retardant aid, and reaction initiator are usually preferably 5 to 50% polyphenylene oxide.
-95% by weight, 1-95% by weight of crosslinkable polymer/monomer, 1-90% by weight of flame retardant, and 1-50% by weight of flame retardant aid. Further, the proportion of the reaction initiator added in addition to such a mixture is preferably 0 to 10% by weight. Of course, the blending ratio of the flame retardant depends on the flame retardant ability of the flame retardant, the relative permittivity of the flame retardant itself, and the relative permittivity and resin properties required for the resin composition after adding the flame retardant. It can be determined accordingly. As described above, the flame retardant polyphenylene oxide resin composition of the present invention contains polyphenylene oxide, a crosslinkable polymer, a crosslinkable monomer, a flame retardant, a flame retardant aid, and a reaction initiator. However, properties such as the dielectric constant may be changed by further blending various inorganic fillers. Examples of such inorganic fillers include:
Titanium dioxide-based ceramics, barium titanate-based ceramics, lead titanate-based ceramics, strontium titanate-based ceramics, calcium titanate-based ceramics, lead zirconate-based ceramics, and the like can be used singly or in combination. The flame-retardant polyphenylene oxide resin composition of the present invention as described above is usually dissolved in a solvent, dispersed, and mixed. In this case, the amount of solvent used should be 5 to 50% by weight solution of the flame retardant polyphenylene oxide resin composition (or the solid content of the resin should be in the range of 10 to 13% by weight based on the solvent). is preferable. As the solvent, halogenated hydrocarbons such as trichloroethylene, trichloroethane, chloroform, methylene chloride, and chlorobenzene, aromatic hydrocarbons such as benzene, toluene, and xylene, acetone, and carbon tetrachloride can be used, and trichloroethylene is particularly preferred. These can be used alone or in combination of two or more. The flame-retardant polyphenylene oxide-based laminate of the present invention is obtained by forming a sheet from the flame-retardant polyphenylene oxide-based resin composition of the present invention, or by impregnating the same into a base material to form a prepreg. If necessary, core materials and the like are manufactured from these sheets and prepregs, and then they are laminated and integrated with other base materials, films, prepregs, metal foils, etc. according to conventional methods. When forming a sheet from a flame-retardant polyphenylene oxide resin composition, for example, a casting method can be used. The casting method is a method in which a resin mixed with a solvent is formed into a thin layer by casting or coating, and then the solvent is removed to form a cured product. According to the casting method, a cured product can be obtained at a low temperature without using the costly calendar method. To explain this casting method more specifically, for example, a flame retardant polyphenylene oxide resin composition mixed with a solvent is placed on a mirror-treated iron plate or a carrier film for casting. Casting (or coating) to a thickness of ~700 (preferably 5-500) μm
A sheet is obtained by thoroughly drying and removing the solvent. Carrier films for casting are not particularly limited, but include those insoluble in the above solvents, such as polyethylene terephthalate (hereinafter abbreviated as "PET") film, polyethylene film, polypropylene film, polyester film, and polyimide film. is preferable, and
It is preferable to use a mold release treatment. Drying is performed by air drying or hot air drying. In this case, it is preferable that the upper limit of the temperature range be lower than the boiling point of the solvent or lower than the heat-resistant temperature of the carrier film for casting (when drying is performed on the carrier film for casting). . The lower limit shall be determined depending on drying time and processability. For example, when trichlorethylene is used as a solvent and PET film is used as a carrier film for casting,
Preferably, the temperature is up to 80°C. Note that by increasing the temperature within this range, the drying time can be shortened. When manufacturing a prepreg by impregnating a base material with a flame-retardant polyphenylene oxide resin composition, the following method can generally be used. That is, the base material is immersed (dipped) in a solvent dispersion of the flame retardant polyphenylene oxide resin composition to impregnate and adhere the flame retardant polyphenylene oxide resin composition to the base material. . Then, the solvent is removed by drying or the like, or semi-cured to bring it to the B stage. In this case, the impregnation amount of the flame retardant polyphenylene oxide resin composition is not particularly limited, but is 30 to 80% by weight.
It is preferable that The base material may be cloth-like materials that can be impregnated with resin such as glass cloth, aramid cloth, polyester cloth, or nylon cloth, pine-like materials made of these materials and/or fibrous materials such as nonwoven fabrics, kraft paper, linter paper, etc. Paper or the like can be used, but the material is not limited to these materials. As the metal foil for circuit formation used in forming the metal-clad laminate of the present invention, a wide variety of metal foils used for ordinary wiring boards can be used. For example, metal foil such as copper foil or aluminum foil can be used. In this case, it is preferable that the metal foil has a smooth adhesive surface and good conductivity in order to improve the characteristics of the printed wiring board. A desired conductor can be formed from such metal foil by a subtractive method or the like. Alternatively, a desired conductor (circuit, electrode, etc.) may be formed by vapor deposition, an additive method (sol additive method, semi-additive method), or the like. As a method for producing a laminate using a core material, sheet, or prepreg produced from a flame-retardant polyphenylene oxide resin composition, the following method can be used, for example. That is, the above-mentioned properly dried sheets and/or prepregs are combined in a predetermined manner so as to have a predetermined design thickness, and if necessary, metal foil such as a conductive layer for wiring is also combined and laminated, followed by heating and pressing. The resin is melted and sheets are bonded together, sheets and prepreg or core material, prepregs are bonded to each other, sheets and metal foil, and prepreg and metal foil are bonded to each other to form a laminate. Strong adhesion is obtained by this fusion, but even stronger adhesion can be obtained if the heating at this time causes a crosslinking reaction by the reaction initiator. Such a crosslinking reaction is carried out by photocrosslinking such as ultraviolet irradiation, thermal crosslinking, radiation irradiation, or the like. Note that such adhesion may be performed using an adhesive in combination. Here, the combination of sheet, prepreg, and core material when used together is not particularly limited, but after molding, the combination should be vertically symmetrical.
This is preferable from the viewpoint of preventing warpage after secondary processing (etching, etc.). Further, it is preferable to combine the sheets so that they are placed on the adhesive interface with the metal foil, since the adhesive force can be improved. The temperature during heat pressing depends on the combination of metal foil and film or prepreg, but for example,
Since the heat fusion properties of the sheet can be used to bond the metal foil and the sheet, the lamination pressing temperature is preferably higher than the glass transition point of the sheet, and is preferably in the range of about 160 to 300°C. Furthermore, when crosslinking the flame retardant polyphenylene oxide resin composition of the present invention by placing it in a dryer and heating it, the crosslinking reaction depends on the reaction temperature of the initiator used, etc. , heating temperature and heating time are selected depending on the type of initiator. For example, the temperature is 150 to 300°C and the time is about 10 to 60 minutes. The pressing conditions can be, for example, a pressure of about 30 to 80 kg/cm ² . The above-described heat-pressing may be carried out by heat-laminating a predetermined number of the films and/or prepregs, overlaying metal foil on one or both sides of the film, and heat-pressing again. . (Function) The flame-retardant polyphenylene oxide resin composition of the present invention has the excellent heat resistance, dimensional stability, chemical resistance, and low dielectric constant that polyphenylene oxide resin compositions have, It also exhibits flame retardant properties and resin properties for printed wiring boards. Therefore, a laminate using the flame-retardant polyphenylene oxide resin composition of the present invention is easy to process with high precision, is suitable for high-speed signal processing, and can also realize high-density multilayering. Next, examples will be shown to further explain the flame retardant polyphenylene oxide resin composition of the present invention and the metal-clad laminate of the present invention using the same. (Example) (A) Example of producing a flame-retardant polyphenylene oxide resin composition and a laminate using the same 1 Polyphenylene oxide was placed in a reactor equipped with a pressure reduction device.
30% by weight (GE PPO), 4% by weight of styrene-butadiene copolymer (Asahi Kasei Corporation; Solprene T406), triallyl isocyanurate (Nippon Kasei Corporation:
TAIC) 4.5% by weight, polytrialyl isocyanurate 4.5% by weight, flame retardant GX-6145 (Daiichi Kogyo Seiyaku)
20% by weight, 5% by weight of antimony trioxide sol (Nissan Chemical Co., Ltd.) as a flame retardant auxiliary agent, and further toluene, stirred thoroughly until a homogeneous solution was formed, defoamed, and turned into a flame retardant polyester. A phenylene oxide resin composition was obtained. Next, the obtained flame-retardant polyphenylene oxide resin composition was coated onto a PET film using a coating machine to a thickness of 500 μm. After drying this at 50°C for about 10 minutes, the formed film was released from the PET film and dried at 120°C for another 30 minutes.
After drying for a minute, toluene was completely removed to obtain a sheet made of a flame-retardant polyphenylene oxide resin composition. The thickness of this sheet was approximately 150 μm. Stack 4 of these sheets, 190℃, 50Kg/
The sheet was pressed for 30 minutes at a pressure of cm ² for complete curing, and as shown in FIG. 1, a laminate consisting of four sheets 1 laminated and integrated was produced. A metal foil is laminated on this to obtain a metal-clad laminate. Alternatively, as shown in FIG. 2, prepreg 2 may be manufactured and metal foil 3 may be laminated thereon. Examples 2 to 9 Eight types of resin compositions were produced in the same manner using the formulations of flame-retardant polyphenylene oxide resin compositions as shown in Table 1. Furthermore, a laminate was similarly produced using the resin composition. The physical properties of the obtained laminates of Examples 1 to 9 were evaluated in terms of dielectric constant, dielectric loss tangent, solder heat resistance, copper foil peel strength, flame retardance, and the like. The results are also shown in Table 1. As is clear from the comparison with the comparative example described below, the characteristics of the laminate of the present invention are very good. Comparative Example 1 A resin composition was manufactured using the formulation shown in Table 1 without adding a flame retardant or a flame retardant aid to a polyphenylene oxide resin composition. Furthermore, a laminate was produced using the resin composition, and its physical properties were evaluated.

【table】

[Table] (B) Example of producing a flame-retardant polyphenylene oxide resin composition and a metal-clad laminate using the same 1 Polyphenylene oxide was placed in a reactor equipped with a pressure reduction device
30% by weight (GE PPO), 4% by weight of styrene-butadiene copolymer (Asahi Kasei Corporation: Solprene T406), triallyl isocyanurate (Nippon Kasei Corporation:
TAIC) 4.5% by weight, polytriallylisocyanunate 4.5% by weight, Perbutyl P (NOF) 2% by weight, flame retardant GX-6145 (Daiichi Kogyo Seiyaku) 20% by weight,
Add 5% by weight of antimony trioxide sol (Nissan Chemical Co., Ltd.) as a flame retardant aid, and then add toluene (Hakai Chemical Co., Ltd.) and stir thoroughly until a homogeneous solution is obtained.
A flame-retardant polyphenylene oxide resin composition was obtained by defoaming. Next, a glass cloth was impregnated with the obtained flame-retardant polyphenylene oxide resin composition using an impregnating device, and dried at 110°C for about 7 minutes to remove toluene. It was created. Four sheets of this prepreg were stacked together, and electrolytic copper foil with a thickness of 18 μm was stacked on both sides.
Pressing was carried out for 30 minutes under conditions of Kg/cm ² to produce a metal-clad laminate consisting of four sheets of prepreg 2 and two sheets of copper foil 3 laminated and integrated as shown in FIG. Examples 2 to 9 The flame retardant polyphenylene oxide resin compositions were formulated as shown in Table 2, and eight types of resin compositions were produced in the same manner. Further, a metal-clad laminate was similarly produced using the resin composition. The physical properties of the metal-clad laminates obtained in Examples 1 to 9 were evaluated in terms of dielectric constant, dielectric loss tangent, heat resistance, peel strength, flame retardance, and the like. The results are also shown in Table 2. Further, the metal-clad laminate thus obtained was subjected to etching, through-hole processing, and other treatments such as plating by conventional methods to produce a multilayer wiring board for practical use. When this multilayer wiring board was used as a wiring board for a high-speed signal processing circuit, signal delay was suppressed and good results were obtained. Comparative Examples 1 to 2 Two types of resin compositions were manufactured using the formulations shown in Table 2 without incorporating a flame retardant or a flame retardant aid into the polyphenylene oxide resin composition. Furthermore, a metal-clad laminate was produced using the resin composition, and its physical properties were measured. Comparative Example 3 A metal-clad laminate was produced in the same manner as in Example 2 without incorporating polytriallylisocyanurate as a crosslinkable polymer, and its properties were evaluated. As a result, the soldering heat resistance deteriorated, and the copper foil peel strength decreased to 0.85. (Effects of the Invention) According to the flame-retardant polyphenylene oxide-based resin composition of the present invention, polyphenylene oxide, a crosslinkable polymer and/or monomer, a flame retardant or a flame retardant and a flame retardant aid are further added. By blending a reaction initiator according to the conditions, we can create a resin composition for laminated substrates that has excellent heat resistance, dimensional stability, chemical resistance, good processability, low dielectric constant, and excellent flame retardancy. can get. Therefore, the laminate of the present invention formed using the flame-retardant polyphenylene oxide resin composition of the present invention can be processed with high precision as a wiring board, and has excellent heat resistance and chemical resistance during mounting. Since it has excellent flame retardancy and good dielectric properties, it is also advantageous as a high-density multilayer wiring board for high-speed signal processing.

【table】

【table】 [Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views showing embodiments of the laminate of the present invention, respectively. 1...sheet, 2...prepreg, 3...metal foil.

Claims (1)

[Scope of Claims] 1. A flame retardant resin composition containing polyphenylene oxide, a crosslinkable polymer, a crosslinkable monomer, a flame retardant or a flame retardant and a flame retardant aid, and optionally a reaction initiator. <1> As a crosslinkable polymer, at least one type of polytriallyl isocyanurate or polytriallyl cyanurate having a number average molecular weight of 10,000 or less; <2> As a crosslinkable monomer, triallyl isocyanurate or triallyl cyanurate and <3> one or more flame retardants selected from brominated diphenyl ether-based, brominated bisphenol-based, brominated polycarbonate-based, and brominated cyanuric acid-based flame retardants. 1. A flame-retardant polyphenylene oxide resin composition for electrical laminates.