JPS62248632A - Metal-lined flexible laminated board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to a metal-clad flexible laminate having excellent mechanical strength and heat resistance.

[Background technology]

Currently, polyimide film and glass epoxy are the only flexible printed wiring boards that are resistant to soldering heat.

However, polyimide films are expensive, and glass epoxy has drawbacks such as poor folding durability.

Therefore, it is desired to develop a flexible printed wiring board that is inexpensive, has good mechanical strength and heat resistance, and has sufficient bending durability.

Table 1 shows the physical properties of various metal-clad flexible laminates. As shown in the same table, those using polyphenylene oxide as the resin and composited with glass cloth have low dielectric constant and dielectric loss tangent, excellent high frequency characteristics, and good peel strength.

Those using polyimide as the resin have excellent flexibility, but are very expensive and have poor high frequency characteristics. Products using polyester (polyethylene terephthalate) as the resin are very cheap, but have poor peel strength and high frequency properties. Those that use epoxy as the resin and are composited with glass cloth are slightly less expensive, but have poor flexibility and high frequency characteristics.

Therefore, as a flexible printed wiring board that is inexpensive, has good mechanical strength, heat resistance, etc., and has sufficient bending durability, one using polyphenylene oxide can be considered. Furthermore, those using polyphenylene oxide are also suitable for high frequency and ultra-high frequency applications.

In addition, flexible printed wiring boards are used in a wide range of applications due to their flexibility, but when performing printed wiring, if the laminated board for flexible printed wiring boards is warped, it may be difficult to accurately perform printed wiring. I can't do it. Metal-clad flexible laminates with less warpage are desirable.

[Purpose of the invention]

In view of these circumstances, it is an object of the present invention to provide a metal-clad flexible laminate that uses an inexpensive resin, has good mechanical strength and heat resistance, and has little warpage.

[Disclosure of the invention]

In order to achieve the above object, the present invention uses a resin-impregnated base material as a core material, which is impregnated with a polyphenylene oxide resin composition containing polyphenylene oxide, a crosslinkable polymer and/or a crosslinkable monomer, and an initiator. The gist is a metal-clad flexible 8-layer board, in which a resin layer is provided on both surfaces, and a metal layer is formed on at least one surface through the resin layer.

The present invention will be explained in detail below.

The resin-impregnated base material used in this invention is produced by impregnating a base material with a resin liquid and then drying it. The base materials include resin-impregnated or loss-like materials such as glass cloth, aramid cloth, polyester cloth, and nylon cloth, mat-like materials made of these materials and/or fibrous materials such as non-woven fabrics, kraft paper, linter paper, etc. Paper or the like may be used, but the material is not limited to these. By combining these base materials with the polyphenylene oxide resin composition described below, mechanical strength, heat resistance, etc. are supplemented.

The resin liquid used for impregnation is mainly composed of polyphenylene oxide as a raw material, to which a crosslinkable polymer and/or a crosslinkable monomer is added.

Here, polyphenylene oxide (also referred to as polyphenylene ether, hereinafter referred to as rPPOJ) is, for example, represented by the following formula, and examples thereof include poly(2.
6-dimethylto-4-phenylene oxide).

Such a ppo is, for example, USP 4059
It can be synthesized by the method disclosed in No. 568. For example, 2,6-xylenol is subjected to an oxidative coupling reaction with an oxygen-containing gas and methanol in the presence of a catalyst, and poly(2,6-dimethyl-1,4
-phenylene oxide), but is not limited to this method. Here, as a catalyst, a copper (1) compound, N-N''-di-tert-butylethylenediamine,
Contains butyldimethylamine and hydrogen bromide. Based on methanol, 2 to 15% by weight of water is added to the reaction mixture system, and the total amount of methanol and water is 5 to 25% by weight.
It is used in such a way that it becomes a polymerization solvent with a heavy weight of %. Although not particularly limited, for example, weight average molecular weight (MW)
is 50,000. Molecular weight distribution Mw/Mn=4.
2 (Mn is number average molecular weight) is preferably used.

PPO is a resin with a low dielectric constant (and low dielectric loss), so it is suitable for laminates used in the ultra-high frequency range, but of course it may also be used in other frequency ranges.It is also inexpensive.

Examples of crosslinkable polymers include, but are not limited to, 1,2-polybutadiene, 1,4
- Polybutadiene, styrene-butadiene copolymer, modified 1,2-polybutadiene (maleic modification, acrylic modification, epoxy modification).

Examples include rubbers, and each may be used alone or in combination of two or more. The polymer state may be an elastomer or a rubber, but a high molecular weight rubber is particularly preferred since it improves film forming properties.

When the PPO resin composition used in this invention is made into a film by the casting method described below, from the viewpoint of improving the film forming properties, it is recommended to use polystyrene within a range that does not interfere with achieving the purpose of this invention. preferable. Note that polystyrene with a high molecular weight is desirable because it improves film-forming properties.

Examples of crosslinking monomers include ■ester (meth)
Acrylates, epoxy (meth)acrylates, urethane (meth)acrylates.

(Meth)acrylates such as ether (meth)acrylates, melamine (meth)acrylates, alkyd (meth)acrylates, silicone (meth)acrylates, triallyl cyanurate, triallyl isocyanurate, ethylene glycol dimethacrylate, Divinylbenzene.

Polyfunctional monomers such as diallyl phthalate, ■vinyltoluene, ethylvinylbenzene, and styrene.

Examples include monofunctional monomers such as rosemethylstyrene, polyfunctional epoxies, etc., and each may be used alone or in combination of two or more, but is not particularly limited to these.

As the crosslinking monomer, triallyl cyanurate and/or triallyl isocyanurate are used.
It is good because it has good compatibility with PO and is preferable in terms of film formability, crosslinkability, heat resistance, and dielectric properties. Triallyl cyanurate and triallyl isocyanurate are chemically structurally isomers and have similar film-forming properties, compatibility, solubility, reactivity, etc. One or both can be used.

The crosslinkable polymer and/or crosslinkable monomer are used to improve heat resistance and the like without impairing the properties of PPO by crosslinking (curing) it. These may be used alone or in combination, but their combined use is more effective in improving characteristics.

In addition, a ppo fatty acid constituent composition, a backing agent, and an initiator are used. As an initiator, dicumyl peroxide,
tart-butylcumyl peroxide, g-tart
-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)-bis(tert-butylperoxyisopropyl)benzene] and other peroxides such as NOF bistamyl, each of which may be used alone or in combination of two or more, Not limited to these.

The blending ratio of the above raw materials is not particularly limited, but PP
0IO to 90 parts by weight, 1 to 50 parts by weight of crosslinkable polymer and/or crosslinkable monomer, and 0.1 to 5 parts by weight of initiator.
Preferably, it is expressed in parts by weight. Further, although not particularly limited, it is preferable to use the crosslinkable polymer at a ratio of 20 parts by weight or less per 1 part by weight of the crosslinkable monomer. however,
When PPO is used in combination with polystyrene and/or styrene-butadiene copolymer, it is preferable to use the following blending weight ratio.

The raw materials according to the above formulation are usually dissolved in a solvent and mixed (solution mixing). In this case, it is preferable to form a 5 to 50% by weight solution of the PPO resin composition. After mixing, a PPO resin composition is obtained by removing the solvent. Examples of the solvent include halogenated hydrocarbons such as trichloroethylene, trichloroethane, chloroform, methylene chloride, and chlorobenzene, aromatic hydrocarbons such as benzene, toluene, and xylene, acetone, and carbon tetrachloride. Trichlorethylene is particularly preferred; Each of them can be used alone or in combination of two or more, but is not limited thereto. Note that the mixing may be performed by other methods.

A resin-impregnated base material impregnated with the PPO resin composition (hereinafter referred to as
(referred to as "prepreg") may be produced by any method, but generally it can be produced by the following method.

That is, the PPO resin composition or its raw material is completely dissolved in the above solvent at a ratio of, for example, 5 to 50% by weight,
The base material is dipped in this solution to impregnate and adhere these PPO resin compositions to the base material. In this case, the solvent may be simply removed by drying or the like, or the material may be semi-cured to a so-called B stage. The resin content of the prepreg thus produced is not particularly limited, but is preferably 30 to 50% by weight. If the prepreg is produced in this way, it is not necessary to melt the resin, so it can be done more easily at a relatively low temperature.

The resin layer formed on one side of the prepreg may have the same composition as the PPO resin composition impregnated into the base material, but may have a different composition. Methods for forming this resin layer on one side of the prepreg include, for example, the following two methods, but are not limited to these.

(2) A method in which the PPO resin composition is made into a film (sheet) and laminated onto a prepreg by heat or other means.

(2) A method in which the PPO resin composition is made into a solution, applied to prepreg, and dried.

The film used in method (1) above can be made by a casting method.

To explain this casting method in detail, please refer to the above page.
The PO resin composition or its raw material is added to the above solvent for 5 to 5 minutes.
A solution mixed at a ratio of 0% by weight is placed on a mirror-treated iron plate or a carrier film for casting, etc. at a concentration of, for example, 5 to 700% (preferably 5 to 5% by weight).
00) A film is obtained by casting (or coating) to a thickness of μm and thoroughly drying to remove the solvent. The carrier film for casting is not particularly limited, but it is preferably one that is insoluble in the above solvent, such as polyethylene terephthalate (hereinafter abbreviated as rPETJ) film, polyethylene film, polypropylene film, polyester film, or polyimide film, and The PPO resin composition solution cast (or coated) on a carrier film for casting, which is preferably subjected to mold release treatment, is
The solvent is removed by air drying and/or hot air drying. The upper limit of the set temperature during drying is preferably lower than the boiling point of the solvent or lower than the heat resistance temperature of the carrier film for casting (when drying is performed on a carrier film for casting), and the lower limit is lower than the boiling point of the solvent or lower than the heat resistance temperature of the carrier film for casting. It is determined by time and processability. For example, when trichlorethylene is used as a solvent and PET film is used as a carrier film for casting, a temperature range from room temperature to 80°C is preferable, and if the temperature is raised within this range, the drying time will be reduced. can be shortened.

According to this casting method, there is no need to melt the resin (and the expensive calendar method is not required, and it is possible to cast a film of the PPO resin composition at a low temperature. It may become a thing.

A film made of a PPO resin composition can be produced, for example, by the above-mentioned casting method, but methods other than this method may also be used.

Regarding the above method (■), if the above prepreg is used in place of the above-mentioned casting carrier film (mold release film) in the above casting method, the same structure as in the case of lamination in method (■) can be obtained by drying. .

Either of the above methods (1) and (2) may be used, but method (2) can be made more inexpensively.

As the metal layer, metal foil such as copper foil or aluminum foil is used. It is preferable that the metal foil has a smooth adhesion surface and good conductivity in order to improve dielectric properties. or
A metal layer may be formed by vapor deposition, or a desired conductor (circuit,
It may be formed as an electrode, etc.), and there is no particular limitation.

As the resin layer, any adhesive such as a film adhesive or a liquid adhesive may be used. When using a liquid adhesive, it may be applied to the prepreg or to the back surface of the metal foil. However, when applying to the back side of metal foil, workability is improved if heat is applied to semi-cure (B-stage) to eliminate stickiness in advance. Note that the method of applying the liquid adhesive is not particularly limited.

The composition of the adhesive is not particularly limited as long as it has flexibility after curing and resistance to soldering heat.

For example, acrylic adhesives, epoxy nylon adhesives, polyimide adhesives, epoxy adhesives, and the like are preferably used. In addition, the above casting film (film made by the gear casting method) also has a
When pressure is applied at a temperature of 0° C. or higher, the metal foil and prepreg are firmly heat-fused, so this property may be utilized.

Furthermore, if the film is cured after heat fusion, the adhesive strength will further increase.

All materials used in this invention, such as the PPO resin composition and resin layer, involve reactions (curing). That is, heat treatment is necessary to improve physical properties such as heat resistance. This heat treatment
For example, it is possible to first laminate the resin layer and prepreg, then laminate the metal foil through the resin layer, and then laminate the metal foil, and then perform the curing process again, but this would require two curing steps. , is very time-consuming. For this reason, when manufacturing the metal-clad flexible laminate of the present invention, 1. After integrating the resin layer, prepreg, and metal foil by a method such as temporary pressing, the resin layer, prepreg, and metal foil are integrated at once by heating for a certain period of time to cure them. It's good.

As a method of curing, a continuous method may be used in which the uncured product is allowed to flow, but since curing takes time, the line speed cannot be increased. In such a case, productivity can be increased by winding up the uncured product and post-curing the rolled roll in a dryer or the like. Also, if you keep it rolled up, it takes up less space. Note that if the resin layer is rolled up before curing, the surface of the metal foil will come into contact with the surface of the resin layer, so it is better to release the surface of the metal foil with silicone resin or the like.

The metal-clad flexible laminate thus obtained is
Since PPO is used as the resin, it is inexpensive and has excellent high frequency characteristics. Since the prepreg is impregnated with a PPO resin composition containing PPO, a crosslinkable polymer and/or a crosslinkable monomer, and an initiator, it has excellent mechanical strength and heat resistance, and also has resin on both sides of the prepreg. Since it has layers, there is less warping. Also, unlike glass epoxy, it is extremely flexible and has excellent bendability. That is, the folding durability is good.

The preferred thickness of the metal-clad flexible laminate of the present invention is 50 to 300 μm, and the preferred thickness of the core material is 30 to 300 μm.
It is 270 μm. The preferred thickness of each prepreg is 30 to 120 μm, and the preferred thickness of the resin layer is 30 to 120 μm.
100 μm, but is not limited to these ranges. 1
The resin layer may be a single layer or may be two or more layers.

, 5 and 6 show an example of continuous production of the metal-clad flexible laminate of the present invention. As shown in both figures, the resin impregnating means 2 (
In this example, PP is supplied to the substrate l (dip tank).
Impregnation with solution 3 of O resin composition. The base material 1 impregnated with the solution 3 of the PPO resin composition is further continuously sent to a drying means 4 (a dryer in this example) and dried.
This becomes prepreg 5. This prepreg 5 is continuously sent to a single-sided coating means 6 (knife coater in this example), and one side is coated with a solution of a resin composition (in this example, PP).
'O resin composition solution 3) is applied to a uniform thickness (see Figure 7). The prepreg 5 coated with the solution 3 of the PPO resin composition on one side is then continuously sent to the drying means 7 (in this example, a dryer) and dried, so that a layer 13 of the PPO resin composition is coated on one side. After being formed, it is wound into a roll. This rolled up prepreg 5 is again continuously sent to the single-sided coating means 8 (knife coater in this embodiment), and the other side (opposite to the previously coated side) is also coated with the resin composition. A solution (in this example, PPO resin composition solution 3) is applied to a uniform thickness (see FIG. 8). Prepreg 5 coated with solution 3 of PPO resin composition on the other side
is then continuously sent to the drying means 9 (in this example, a dryer) and dried, and the other side is also coated with PPO.
A layer 13 of resin composition is formed. A metal foil 10 (copper foil in this example) is superimposed on the layer 13 of the PPO resin composition (see Fig. 9) and is temporarily pressed by a temporary pressing means 11 (W belt press in this example). After that, it is rolled up.

As shown in FIG. 10, the rolled-up laminate 12 is after-cured by a curing means to form a metal-clad flexible laminate.

FIG. 11 shows another example of continuous production of the metal-clad flexible laminate of the present invention. As shown in the figure, a base material 1 (glass cloth in this embodiment; see FIG. 12) wound into a roll is continuously supplied to a resin impregnating means 2 (a dip tank in this embodiment). , the base material 1 is impregnated with a solution 3 of the PPO resin composition.

The base material 1 impregnated with the solution 3 of the PPO resin composition is further continuously sent to a drying means 4 (in this embodiment, a dryer) and dried to become a prepreg 5 (see the box in FIG. 12). ). This prepreg 5 is continuously sent to a single-sided coating means 6 (a knife coater in this example), and a solution of a resin composition (solution 3 of a PPO resin composition in this example) is applied to one side of the prepreg to a uniform thickness. It is coated like this. The prepreg 5 coated with the PPO resin composition solution 3 on one side is
Subsequently, the drying means 7 (in this embodiment a dryer)
It is sent to dry and coated with a layer 1 of PPO resin composition on one side.
3 is formed (see M in FIG. 12). This prepreg 5 is continuously fed, and the adhesive 15 side of the adhesive-coated metal foil 14 (copper foil in this embodiment) is superimposed on the other side (the opposite side to the previously applied side). After being temporarily pressed by a temporary pressing means 16 (a roll press in this embodiment) (see N in FIG. 12), it is wound up. 11th
As shown at P in the figure, the rolled-up laminate 12 is after-cured as it is to become a metal-clad flexible laminate.

In the above explanation, metal foil was provided on only one side of the metal-clad flexible laminate, but metal foil was provided on the resin layer on both sides, so that metal layers were provided on both sides of the metal-clad flexible laminate. It's okay.

Note that the method for producing the metal-clad flexible laminate of the present invention is not limited to the above method. It is not a continuous method (it may also be produced by a batch method).

Next, examples and comparative examples will be explained. In addition, “department”
All hail the Senryobu.

(Example 1) 100 parts of PPO (with a molecular weight of about 10,000), 25 parts of styrene-butadiene copolymer (Asahi Kasei Corporation Turuprene T406) as a crosslinkable polymer, triallylisocyanurate (Nippon Kasei n'T'AI) as a crosslinkable monomer
c) 15 parts and 1 part of 2,5-dimethyl-2,5-di(tert-)ethylperoxy)hexine-3 (NOF ■Perhexine 25B) as a reaction initiator, and trichlorethylene (Toagosei Chemical Co., Ltd.) (Industrial trichlene) 15% and 25% 2 by stirring well and mixing in a solvent.
A solution of a standard PPO resin composition was prepared. Below, 15
The 25% solution is called solution A and the 25% solution is called solution B.

Pass a glass cloth (1100p thick) into solution A, scrape off the solution with a bar coater, dry for 10 minutes in a dryer at 60°C, and then dry in a dryer at 130'C for 2 minutes.
It was dried for 0 minutes to produce a prepreg with a resin content of 30%. This prepreg is referred to as prepreg E.

Next, solution B was uniformly applied to this prepreg E to a thickness of about 200 pm, and then dried in a dryer at 60°C for 10 minutes, and further dried at 130°C for 20 minutes to reduce the amount of residual trichlorethylene to zero. . The overall thickness of this composite film at this time was 150 μm.

Since the reaction initiator used here has a one-minute aging temperature of 190° C., this composite film is uncured.

Next, an epoxy adhesive (AH-333 from Mitsui Petrochemicals) was applied to the back surface of the 35 Ina thick copper foil to a thickness of 50 prm and dried at 130°C for 5 minutes. This adhesive-coated copper foil and the composite film at the tip were heated to 15 kg/- at 160°C.
Temporary compression was performed using a roll at a pressure of about 0.5 seconds.

The thus produced laminate was placed in a dryer at 230° C. and heated for 20 minutes to fully cure the composite film and adhesive to obtain a metal-clad flexible laminate. The total thickness of this metal-clad flexible laminate was approximately 200 mm. Second
The physical properties are shown in the table. This metal-clad flexible laminate has a layered structure as shown in FIG. In the figure, 21
22 is a cured layer of PPO resin composition, 22 is a cured prepreg layer, 23 is a cured adhesive layer, and IO is a metal foil.

(Example 2)? 200 -
After applying the film evenly and drying it for 10 minutes in a dryer at 60°C, carefully peel it off from the PET film to remove the PPO.
Only the film of the resin composition was dried in a dryer at 130°C for 20
After drying for minutes, a film free of residual trichlorethylene was obtained.

This film was placed on top, followed by a copper foil coated with the same adhesive as in Prepreg E1 Example 1.
Temporary compression was performed for about 0.5 seconds using a roll with a pressure of 5 kg/cj. The uncured metal-clad flexible laminate thus produced was placed in a dryer at 230°C and heated for 20 minutes to fully cure the film, prepreg, and adhesive. The total thickness of this metal-clad flexible laminate is approximately 20
The physical properties are shown in Table 2. This metal-clad flexible laminate has a layered structure as shown in FIG.

(Example 3) A 25μ thick acrylic resin adhesive sheet (DuPont's Vyralux WA/A) and a 184J yen copper foil were applied to the side of the composite film produced in Example 1 that was not coated with solution B. They were stacked one on top of the other and pre-pressed for about 0.5 seconds at 160°C using a roll with a pressure of 15 kg/c-.

This was sufficiently cured in the same manner as in Example 1 to obtain a metal-clad flexible laminate. The total thickness of this metal-clad flexible laminate was approximately 180 mm.

Its physical properties are shown in Table 2. This metal-clad flexible laminate has a layered structure as shown in FIG.

(Example 4) Solution B was applied to a thickness of 200 J1 m also on the side of the composite film produced in Example 1 to which Solution B was not applied, and dried under the same conditions as on the opposite side. The film produced in this way was layered with 18Pm thick copper foil and heated to 220°C for 10 minutes.
Temporary compression was performed for 0.5 seconds using a roll with a pressure of 5 kg/-. This operation was quickly repeated 10 times. The uncured metal-clad flexible laminate thus produced was sufficiently cured under the same conditions as in Example 1 to obtain a metal-clad flexible laminate. The thickness of this metal-clad flexible laminate was approximately 200 a+. Its physical properties are shown in Table 2. This metal-clad flexible laminate has a layered structure as shown in FIG. In the figure, 21 is a cured layer of the PPO resin composition, 22 is a cured prepreg, and IO is a metal foil.

(Example 5) The film made from solution B prepared in Example 2, prepreg, film, and copper foil were stacked in this order, and 15 kg was heated at 220°C.
Temporary compression was performed for 0.5 seconds using a roll with a pressure of /cd. This operation was repeated 10 times. The thus produced uncured metal-clad flexible laminate was sufficiently cured under the same conditions as in Example 1 to obtain a metal-clad flexible laminate. The thickness of this metal-clad flexible laminate is approximately 200μ
It was m. Its physical properties are shown in Table 2. This metal-clad flexible laminate has a layered structure as shown in FIG.

(Example 6) Using the same materials as in Example 5, 18 μml J- copper foil, film, prepreg, film, and 18-71 copper foil were stacked in this order, and rolled at 220°C and a pressure of 15 kg/cd. This operation was repeated 10 times to obtain an uncured metal-clad flexible laminate.This uncured metal-clad flexible laminate was subjected to the same conditions as in Example 1. It was sufficiently cured to obtain a metal-clad flexible laminate.The thickness of this metal-clad flexible laminate was 220 mm.
Met.

Its physical properties are shown in Table 2. This metal-clad flexible laminate has a layered structure as shown in Figure 3.
21 is a cured layer of PPO resin composition, 22 is a cured prepreg, and 10 is a metal foil.

(Example 7) Using the same composite film as in Example 4, a metal-clad flexible laminate was obtained in the same manner as in Example 6 by laminating 18 tone thick copper foil on both sides. The thickness of this metal-clad flexible laminate was approximately 220 μ-.

Its physical properties are shown in Table 2. This metal-clad flexible laminate has a layered structure as shown in FIG.

(Comparative Example) A metal-clad flexible laminate was obtained in the same manner as in Example 6 by overlaying an 18-thick copper foil on the surface of the composite film prepared in Example 1 coated with solution B. The thickness of this metal-clad flexible laminate was approximately 150 μm. The physical properties are the second
Shown in the table. This metal-clad flexible laminate has a layered structure as shown in FIG. In the figure, 21 is a cured layer of the PPO resin composition, 22 is a cured prepreg, and 10 is a metal foil.

From Table 2, it can be seen that the metal-clad flexible laminates of Examples 1 to 7 have better peel strength and less warpage than the metal-clad flexible laminates of Comparative Examples.

〔Effect of the invention〕

As described above, the metal-clad flexible laminate of the present invention comprises a resin-impregnated base material impregnated with a polyphenylene oxide resin composition containing polyphenylene oxide, a crosslinkable polymer and/or a crosslinkable monomer, and an initiator. It has a core material, a resin layer is provided on both sides, and a metal layer is formed on at least one side through the resin layer, so it is inexpensive, has good mechanical strength and heat resistance, and has little warpage. It becomes.

[Brief explanation of drawings]

Figures 1 to 3 are cross-sectional views of the metal-clad flexible laminate of the present invention, Figure 4 is a cross-sectional view of the metal-clad flexible laminate used for comparison, and Figures 5 and 6 are the metal-clad flexible laminate of the present invention. An explanatory diagram schematically showing an example of a method for continuously manufacturing a plate, and Figures 7 to 9 are enlarged sectional views of the main parts,
Fig. 1O is an enlarged view of another main part thereof, Fig. 11 is an explanatory drawing schematically showing another example of the method for continuously manufacturing the metal-clad flexible laminate of the present invention, and Fig. 12 is It is an explanatory diagram of the main part. 1...Base material 10...Metal foil 21.23...Cured resin layer 22...Cured prepreg (core material) Agent Patent attorney Takehiko Matsumoto Figure 5 Figure 7 −〉

Claims (5)

[Claims] (1) The core material is a resin-impregnated base material impregnated with a polyphenylene oxide resin composition containing polyphenylene oxide, a crosslinkable polymer and/or a crosslinkable monomer, and an initiator, and resin layers are provided on both sides of the core material. A metal-clad flexible laminate having a metal layer formed on at least one surface with the resin layer interposed therebetween. (2) The metal-clad flexible laminate according to claim 1, wherein the resin layer comprises a polyphenylene oxide resin composition containing polyphenylene oxide, a crosslinkable polymer and/or a crosslinkable monomer, and an initiator. (3) A patent in which the polyphenylene oxide resin composition contains 1 to 50 parts by weight of a crosslinkable polymer and/or a crosslinkable monomer and 0.1 to 5 parts by weight of an initiator to 10 to 90 parts by weight of polyphenylene oxide. A metal-clad flexible laminate according to claim 1 or 2. (4) The resin layer, the resin-impregnated base material, and the metal layer are temporarily compressed, and then the resin-impregnated base material and the resin layer are simultaneously cured. metal-clad flexible laminate. (5) The resin layer is formed by applying a solution of a polyphenylene oxide resin composition containing polyphenylene oxide, a crosslinkable polymer and/or a crosslinkable monomer, and an initiator to one or both sides of a resin-impregnated base material, and then drying the resin layer. A metal-clad flexible laminate according to any one of claims 1 to 4, which is formed by: