JPH1142736A - Manufacture of metal foil-clad laminate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To scarcely form a foreign matter on a metal foil of a surface by forming a caul plate of a composite layer plate having a layer of metal foil on a surface layer of insulator made of glass cloth and non-halogen epoxy resin composition. SOLUTION: In the metal foil-clad laminate, flame retardant epoxy resin- impregnated cloth 11 is regulated according to a thickness of the laminate to be manufactured, predetermined number of the clothes 11 are superposed, and metal foils 12 are superposed on both outermost layers to form a laminated material 10. And, a plurality of the materials 10 are superposed while sandwiching metal plates 40 between the respective materials 10 to form the laminate. The laminate is sandwiched between the plates 40 and caul plates 20. Further, the entirety is sandwiched between hot plates 30, heated and pressurized to be manufactured. Incidentally, the plate 20 is formed of a plural-layer plate having a metal foil layer on a surface layer of an insulating layer made of glass cloth and non-halogen epoxy resin composition. And, in the case of incorporating an insulating layer containing halogen epoxy resin composition, a foreign matter is easily formed on the foil of the obtained metal foil-clad laminate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a metal foil-clad laminate used for manufacturing a printed wiring board.

[0002]

2. Description of the Related Art Epoxy resin-based metal foil-clad laminates used in the manufacture of printed wiring boards are prepared by impregnating and drying an epoxy resin composition on a base material such as a glass cloth or the like, and forming an epoxy resin impregnated cloth generally called a prepreg. After manufacturing this, the epoxy resin impregnated cloth is laminated to a predetermined thickness, and a metal foil such as a copper foil is further laminated on at least one of the outermost layers to form a laminate. It is manufactured by sandwiching it between hot plates and molding by heating and pressing.

In order to improve productivity, a laminate is formed by stacking a plurality of laminates while sandwiching a flat plate therebetween, and the laminate is sandwiched between hot plates and heated and pressed to produce a large number of laminates at once. A method of manufacturing a metal foil-clad laminate is also performed.

[0004] However, when the number of laminates sandwiched between the hot plates is three or more, compared to the laminate farther from the hot plate, the laminate near the hot plate has a higher heating rate during heating and has a higher heating rate.・ Because the resin flow at the time of pressurization becomes large, the laminate obtained at the part close to the hot plate has a problem that the thickness deviation is large,
There was a problem that the warpage was large. Therefore, as described in JP-A-54-125266, an organic caul plate such as a copper-clad laminate, generally called a caul plate, is generally provided between a laminate and a hot plate formed by laminating the laminates. It has been studied to reduce sheet thickness deviation and warp torsion by sandwiching a sheet-like elastic body having elasticity, such as cellulose paper, called a cushion material.

[0005] As a backing plate, a copper-clad laminate using an epoxy resin composition similar to the epoxy resin composition used for the metal foil-clad laminate to be manufactured is used. It is common to repeatedly use a cycle of producing a metal foil-clad laminate by heating and pressing.

In recent years, in order to enhance the fire safety of electronic devices, printed wiring boards having excellent flame retardancy have been demanded.
An epoxy resin-based metal foil-clad laminate excellent in flame retardancy, manufactured using a flame-retardant epoxy resin impregnated cloth in which a glass cloth is impregnated with a flame-retardant epoxy resin composition, is used for that purpose.

However, a laminate is formed by using a flame-retardant epoxy resin impregnated cloth, a plurality of the laminates are laminated to form a laminate, and the laminate is sandwiched by a backing plate using a flame-retardant epoxy resin. When the metal foil-clad laminate is manufactured by further heating and pressurizing between the hot plates, the tar-like foreign matter or the foreign matter on the metal foil on the surface of the obtained metal foil-clad laminate is considered to be caused by the foreign matter. In some cases, recesses were formed.

In order to manufacture a printed wiring board, when a conductive circuit is formed by etching the metal foil on which the foreign matter or the concave portion is formed, the portion where the foreign matter is formed remains without being etched, and the space between the conductive circuits is reduced. There may be short-circuit failure, the part where the concave part was formed is excessively etched,
There has been a problem that the conductor circuit may have a disconnection failure, and the yield of the conductor circuit is low. Therefore, there is a demand for a method of manufacturing a metal foil-clad laminate in which foreign substances and the like are hardly formed on the metal foil on the surface.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a glass cloth impregnated with a flame-retardant epoxy resin composition. A required number of epoxy resin-impregnated cloths are stacked, and a metal foil is stacked on at least one of the outermost layers to form a laminate.A plurality of the laminates are stacked to form a laminate, and the laminate is used as an organic backing plate. A method for manufacturing a metal-foil-clad laminate, which is manufactured by heating and applying pressure while sandwiching between hot plates, further comprising a metal-foil-clad laminate in which foreign substances are unlikely to be formed on the surface metal foil. To provide.

[0010]

According to a first aspect of the present invention, there is provided a method for manufacturing a metal-foil-clad laminate, comprising the steps of: providing a glass cloth impregnated with a flame-retardant epoxy resin composition in a required number of cloths impregnated with a flame-retardant epoxy resin; At the same time, a metal foil is laminated on at least one of the outermost layers to form a laminate, a plurality of the laminates are laminated to form a laminate, and the laminate is sandwiched between organic patch plates. A method for manufacturing a metal foil-clad laminate manufactured by heating and pressurizing sandwiched between, wherein the backing plate has a metal foil layer on a surface layer of a glass cloth and an insulating layer made of a non-halogen epoxy resin composition It is a plate.

According to a second aspect of the present invention, there is provided a method of manufacturing a metal foil-clad laminate according to the first aspect, wherein the flame-retardant epoxy resin composition comprises a brominated epoxy resin composition. It is characterized by being a thing.

According to a third aspect of the present invention, there is provided a method of manufacturing a metal foil-clad laminate according to the first or second aspect, wherein the inner layer of the backing plate includes a glass cloth and a non-woven cloth. It is also characterized by having an elastic layer having elasticity sandwiched between insulating layers made of a halogen-based epoxy resin composition.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a metal foil-clad laminate according to the third aspect, wherein the elastic body is made of an aramid fiber sheet, a glass fiber sheet, or a fluoro rubber. It is characterized by being at least one selected from a sheet and a composite thereof.

According to a fifth aspect of the present invention, there is provided a method of manufacturing a metal foil-clad laminate according to any one of the first to fourth aspects, wherein the laminate comprises a conductor circuit. And a laminate in which a required number of flame-retardant epoxy resin-impregnated cloths are stacked on both sides of the organic substrate on which is formed, and a metal foil is stacked on at least one of the outermost layers.

When the backing plate has an insulating layer containing a halogen-based epoxy resin composition, the halogen portion of the halogen-based epoxy resin composition is decomposed by repeated heating and pressing, and peels off from the end of the backing plate. It is thought that it becomes easy to fly. Therefore, when trying to manufacture a metal foil-clad laminate by laminating this patch and the laminate, the decomposed substances scattered from the end of the patch, adhere to the surface of the metal foil,
Foreign matter is likely to be formed on the metal foil of the obtained metal foil-clad laminate. However, according to the present invention, since the insulating layer is an insulating layer made of a glass cloth and a non-halogen epoxy resin composition, the insulating layer is hardly decomposed even after repeated heating and pressing, and the metal of the obtained metal foil-clad laminate is obtained. It is difficult to form foreign matter on the foil, and it is also difficult to form a concave portion considered to be caused by the foreign matter.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for producing a metal foil-clad laminate according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view illustrating one embodiment of a method for manufacturing a metal foil-clad laminate according to the present invention, and FIG. 2 is an embodiment of a method for manufacturing a metal foil-clad laminate according to the present invention. FIG. 3 is a cross-sectional view illustrating another embodiment of the method for manufacturing a metal foil-clad laminate according to the present invention.

In one embodiment of the method for manufacturing a metal foil-clad laminate according to the present invention, as shown in FIG. 1, a flame-retardant epoxy resin-impregnated cloth 11 is adjusted according to the thickness of the laminate to be manufactured. A required number of sheets are stacked, and a metal foil 12 is stacked on both outermost layers to form a laminate 10. A plurality of the laminates 10 are stacked with a metal flat plate 40 interposed therebetween to form a laminate. The laminate is made of a metal flat plate 40,
This is a method of manufacturing a metal foil-clad laminate sandwiched between organic caul plates 20 and further heated and pressed between hot plates 30. Although not shown, an elastic sheet-shaped elastic body such as cellulose paper may be interposed between the caul plate 20 and the hot plate 30 or between the caul plate 20 and the flat plate 40.

Note that, as shown in FIG.
A multilayer board having a metal foil layer 22 on the surface of an insulating layer 21 made of glass cloth and a non-halogen epoxy resin composition, and having no insulating layer containing a halogen epoxy resin composition. It is important that When an insulating layer containing a halogen-based epoxy resin composition is provided, foreign matter is likely to be formed on the metal foil of the obtained metal foil-clad laminate. This is because, when an insulating layer containing a halogen-based epoxy resin composition is provided, the halogen portion of the halogen-based epoxy resin composition is decomposed by repeated heating and pressurization, peeled off from the end of the backing plate 20, and scattered. In order to manufacture the metal foil-clad laminate by laminating the backing plate 20 and the laminate 10 or the like,
It is considered that the decomposed product scattered from the end of the metal foil 12 adheres to the surface of the metal foil 12 and foreign matter is easily formed on the metal foil of the obtained metal foil-clad laminate. In the case of an insulating layer that does not include a glass cloth, the variation in the thickness of the backing plate 20 tends to be large, and the variation in the thickness of the obtained metal foil-clad laminate tends to be large, which is a problem.

As a method of manufacturing the backing plate 20, for example, a glass cloth impregnated with a non-halogen epoxy resin composition impregnated with a non-halogen epoxy resin composition is stacked in a required number of times, and a metal foil is formed on both outermost layers. And then heat and pressurize to integrate them.

The non-halogen epoxy resin-impregnated cloth may be produced, for example, by impregnating a non-halogen epoxy resin composition in a varnish having a viscosity adjusted with a solvent by impregnating the glass cloth and then heating and drying the cloth. It is manufactured by semi-curing or by impregnating a glass cloth with a non-halogen epoxy resin composition in a solid state at room temperature by heating and melting to reduce the viscosity, and then solidifying by cooling. .

The glass cloth is a woven fabric made of glass fiber, and its thickness is generally 0.04 to 0.3 mm. Further, the non-halogen epoxy resin composition contains at least a non-halogen epoxy resin having two or more epoxy groups in a molecule and a curing agent,
An epoxy resin composition containing no halogen-based epoxy resin.

Examples of the above epoxy resin include bisphenol A epoxy resin, bisphenol F epoxy resin, phenol novolak epoxy resin, bisphenol A novolak epoxy resin, cresol novolak epoxy resin, diaminodiphenylmethane epoxy resin and the like. , Modified products and mixtures.
The number of epoxy groups in one molecule of the epoxy resin is not particularly limited as long as it is two or more. However, if the number is too large, the viscosity of the epoxy resin composition becomes high, and the impregnating property to the glass cloth decreases. Therefore, it is preferable to use one in the range of 2 to 30 pieces. In addition, one epoxy group is present in the molecule.
It is also possible to use a plurality of epoxy resins together.

The curing agent contained in the non-halogen epoxy resin composition is not particularly limited as long as it reacts with the epoxy resin and cures. For example, amide curing agents such as dicyandiamide and aliphatic polyamide can be used. Agents, amine-based curing agents such as aromatic amines, phenolic compounds such as bisphenol A, bisphenol F, phenol novolak, cresol novolak, pyrogallol, diaminomaleonitrile, hydrazide compounds, and acid anhydrides. These can be used in combination. Further, the non-halogen epoxy resin composition may contain a curing accelerator and the like, if necessary.

The amount of the resin in the non-halogenated epoxy resin impregnated cloth is 35 to 50 parts by weight based on 100 parts by weight of the non-halogenated epoxy resin impregnated cloth (total weight of resin and glass cloth). preferable. If the amount is less than 35 parts by weight, air bubbles may remain inside the obtained patch plate 20. Therefore, when the patch plate 20 is used repeatedly, the inside of the insulating layer 21 or the insulating layer 21 and the metal foil layer 2
Peeling may occur between the two. When the amount exceeds 50 parts by weight, the variation in the thickness of the backing plate 20 tends to increase, and the variation in the thickness of the metal foil-clad laminate manufactured using the backing plate 20 also tends to increase. .

The metal foil used for manufacturing the backing plate 20 may be copper, aluminum, brass, nickel, or the like.
An alloy or composite metal foil can be used, and the thickness of the metal foil is generally 0.012 to 0.070 mm.

A required number of these non-halogen epoxy resin impregnated cloths are adjusted according to the thickness of the backing plate 20 to be manufactured, and a metal foil is stacked on both outermost layers, and then heated and pressed. The backing plate 20 is manufactured by integrating these. The heating and pressurizing conditions are appropriately selected depending on the temperature at which the epoxy resin in the non-halogen epoxy resin impregnated cloth cures. The pressure is appropriately adjusted to a pressure at which no air bubbles remain in the obtained contact plate, and the pressure is applied. In general, a temperature of 150
Heating and pressurizing are performed under conditions of about 300 ° C., a pressure of 1 to 6 MPa, and a time of about 10 to 120 minutes.

The flame-retardant epoxy resin-impregnated cloth used for the production of the metal foil-clad laminate is obtained by impregnating a glass cloth with a flame-retardant epoxy resin composition. After the glass cloth is immersed and impregnated in a varnish whose viscosity has been adjusted with a solvent, the glass cloth is semi-cured by heating and drying, or a solid flame-retardant epoxy resin composition is heated and melted at room temperature to obtain a viscosity. The glass cloth is impregnated in a state in which is reduced, and then solidified by cooling to produce.

The glass cloth and the thickness thereof can be the same as the glass cloth used for the above-mentioned backing plate.

The flame-retardant epoxy resin composition is a flame-retardant epoxy resin composition containing at least an epoxy resin having two or more epoxy groups in a molecule and a curing agent. As a method of making this resin composition flame-retardant, a method of making it flame-retardant by containing a flame-retardant epoxy resin such as a brominated epoxy resin, or a method of containing a flame retardant such as a phosphorus compound or antimony trioxide. Flame retardation. Incidentally, in the case of a method of flame retardation by containing a brominated epoxy resin, a method containing a flame retardant,
Compared with other methods containing a halogenated epoxy resin, the resulting laminate has excellent electrical properties and is preferred.

As the epoxy resin contained in the flame-retardant epoxy resin composition, the same epoxy resin as used for the above-mentioned backing plate can be used. Examples of the flame-retardant epoxy resin include an epoxy resin in which a part of hydrogen atoms in the structure of the epoxy resin is brominated or chlorinated, or a mixture thereof. The preferred number of epoxy groups in one molecule of the epoxy resin is the same as in the case of the epoxy resin used for the backing plate.

The curing agent contained in the flame-retardant epoxy resin composition may be the same as the curing agent used for the backing plate. When dicyandiamide is contained as a curing agent, the storage stability of the obtained flame-retardant epoxy resin-impregnated cloth and the heat resistance of the obtained metal-foil-clad laminate are excellent and preferable. Furthermore, a curing accelerator, an inorganic filler, and the like can be added to the flame-retardant epoxy resin composition, if necessary.

The amount of resin in the flame-retardant epoxy resin-impregnated cloth is 3 parts per 100 parts by weight of the flame-retardant epoxy resin-impregnated cloth (total weight of resin and glass cloth).
It is preferably from 5 to 70 parts by weight. If the amount is less than 35 parts by weight, the heat resistance of the obtained metal foil-clad laminate may decrease. If it exceeds 70 parts by weight, the thickness of the obtained metal foil-clad laminate may vary greatly. is there.

The metal foil used for manufacturing the metal foil-clad laminate and the thickness thereof can be the same as the metal foil used for the backing plate. The metal foil is
The number of flame-retardant epoxy resin-impregnated cloths is not limited to being overlapped on both outermost layers of the required number of pieces, but it is only necessary to overlap at least one of the outermost layers. When only one is laminated, a release sheet such as a fluororesin film is generally laminated on the other. When the thickness of the metal foil is large, the flat plate 40 sandwiched between the laminates 10 shown in FIG.
Alternatively, the flat plate 40 laminated on the outside of the laminate formed by laminating a plurality of laminates 10 may be omitted.

The required number of flame-retardant epoxy resin-impregnated cloths are adjusted according to the thickness of the metal foil-clad laminate to be manufactured, and the metal foil is stacked on the outermost layer, and then heated and pressed. A metal foil-clad laminate is manufactured by integrating these components. The heating and pressurizing conditions are appropriately selected depending on the temperature at which the epoxy resin in the flame-retardant epoxy resin-impregnated cloth cures. The pressure is appropriately adjusted to such a level that no air bubbles remain in the obtained metal foil-clad laminate, and the pressure is applied. In general, a temperature of 15
Heating and pressurizing are performed under the conditions of 0 to 300 ° C., a pressure of 1 to 6 MPa, and a time of about 10 to 120 minutes.

In the above embodiment, the backing plate has been described as an embodiment in which the backing plate is a multi-layer plate comprising an insulating layer made of glass cloth and a non-halogen epoxy resin composition and a metal foil layer. As shown in FIG. 3, the inner layer of the backing plate 20 may also have an elastic layer 23 having elasticity sandwiched between an insulating layer 21 made of glass cloth and a non-halogen epoxy resin composition. good. In this case, even if a sheet-like elastic body having elasticity such as cellulose paper is not separately prepared and used together with the backing plate 20, the sheet thickness deviation, warpage, and formability (bubble persistence inside the metal foil-clad laminate) can be achieved. Is preferable since a metal foil-clad laminate excellent in the above is obtained. Furthermore, since both surfaces of the elastic body layer 23 are covered, it is possible to prevent the generation of foreign substances such as fibers generated from the surface of the elastic body as compared with the case where the sheet-like elastic body is used alone. preferable.

This elastic body is formed of a sheet having elasticity and enduring the temperature and pressure during heating and pressurizing. For example, aramid fiber sheet, polyester fiber sheet, glass fiber sheet Such as a sheet formed by bonding a large number of fibers with voids between them, and formed into a sheet, fluorine rubber, butadiene styrene rubber or the like having an elastic compound formed into a sheet, or a composite thereof. No. It is preferable that at least one selected from an aramid fiber sheet, a glass fiber sheet, a fluororubber sheet, and a composite thereof is particularly excellent in heat resistance.

In the above embodiment, the required number of flame-retardant epoxy resin-impregnated cloths are stacked one on top of the other, and a metal foil-clad laminate is manufactured using a laminate in which a metal foil is stacked on the outermost layer. Although the form has been described, the laminate is a laminate in which a required number of flame-retardant epoxy resin-impregnated cloths are laminated on both sides of the organic substrate on which the conductive circuit is formed, and a metal foil is laminated on at least one of the outermost layers. good. In this case, it is possible to obtain a multi-layered metal foil-clad laminate having a conductor circuit in the inner layer, in which foreign substances are hardly formed on the metal foil on the surface.

[0038]

【Example】

(Example 1) As a non-halogen epoxy resin composition,
Non-halogen epoxy resin (bisphenol A type epoxy resin [trade name: R-35, manufactured by Mitsui Petrochemical Industries, Ltd.)
0]) as solids, 2.5 parts by weight of a curing agent (dicyandiamide [manufactured by Nippon Carbide Co., Ltd.]), and a curing accelerator (2-ethyl-4-methylimidazole [manufactured by Shikoku Chemicals Co., Ltd.] ]) Was used in an amount of 0.2 part by weight.

Then, a 0.19 mm-thick glass cloth (trade name: 7628, manufactured by Asahi Schwebel KK) was used as a base material for the thermosetting resin whose viscosity was adjusted by adding 20 parts by weight of a solvent (dimethylformamide). Then, it was immersed and impregnated, and then heated and dried at a maximum temperature of 180 ° C. to prepare a non-halogen epoxy resin impregnated cloth having a resin amount of 40% by weight and a gel time of 120 ° C. at 170 ° C.

Then, eight non-halogen epoxy resin impregnated cloths were stacked, and the outermost layers of both cloths had a thickness of 0.0.
After laminating 18 mm copper foil [manufactured by Nikko Gould Foil Co., Ltd.], sandwiched between metal flat plates, five sheets of 190 g / sq. M kraft paper [manufactured by Tomagawa Seisakusho] as an elastic body were laminated on both outer sides. After, sandwiched between hot plates, maximum temperature 180
Heating and pressing were performed at a temperature of 3.0 ° C. and a pressure of 3.0 MPa for 120 minutes to produce a patch.

Further, as a flame-retardant epoxy resin composition,
Epoxy resin (tetrabromobisphenol A type epoxy resin [YDB-500 manufactured by Toto Kasei Co., Ltd.)
K]) as a solid content, 100 parts by weight, a curing agent (dicyandiamide [manufactured by Nippon Carbide Co., Ltd.]) 2.5 parts by weight, and a curing accelerator (2-ethyl-4-methylimidazole [manufactured by Shikoku Chemicals Co., Ltd.] ]) Was mixed and mixed, and a flame-retardant epoxy resin composition was used.

Then, a glass cloth having a thickness of 0.19 mm [trade name: 7628, manufactured by Asahi Sweebel Co., Ltd.] was added to the flame-retardant epoxy resin composition whose viscosity was adjusted by adding 20 parts by weight of a solvent (dimethylformamide). To obtain a flame-retardant epoxy resin-impregnated cloth having a resin amount of 40% by weight and a gel time of 120 seconds at 170 ° C. at a maximum temperature of 180 ° C.

Then, five pieces of the flame-retardant epoxy resin impregnated cloth were stacked, and the outermost layers of both cloths had a thickness of 0.035 m.
m of copper foil (manufactured by Nikko Gould Foil Co., Ltd.) to form a laminate. Then, 10 sets of the laminates are stacked while sandwiching a metal flat plate therebetween to form a laminate, and on both sides of the laminate, a metal flat plate, the above-mentioned contact plate, and 190 g / m 2 as an elastic body. 5 sheets of Kraft paper [made by Tomoe Seisakusho] are stacked in this order, sandwiched between hot plates,
Heat at maximum temperature of 180 ° C and pressure of 3.0MPa for 120 minutes.
A metal foil-clad laminate was produced by pressing.

Next, using the same backing plate repeatedly, the production of the metal foil-clad laminate was performed for 100 cycles.

(Example 2) As an elastic body having elasticity,
A sheet composed of an aramid fiber sheet, a glass fiber sheet and a fluoro rubber sheet [Yamauchi Co., Ltd., trade name F
GK20MK], a single non-halogen epoxy resin impregnated cloth similar to that of Example 1 was laminated on both outer sides thereof, and a copper foil of 0.018 mm thickness [manufactured by Nikko Gould Foil Co., Ltd.] on both outermost layers. By overlapping
Producing and using a backing plate having an elastic layer as an inner layer,
And copper foil thickness 0.035mm, insulation part thickness 0.4m
m epoxy resin double-sided copper-clad substrate [product name: R1766, manufactured by Matsushita Electric Works, Ltd.] is etched to obtain an organic substrate on which a conductor circuit is formed. 1 each of fire-resistant epoxy resin impregnated cloth
A metal foil-clad laminate was manufactured in the same manner as in Example 1 except that the laminate was formed by stacking a copper foil (manufactured by Nikko Gould Foil Co., Ltd.) having a thickness of 0.035 mm on both outermost layers. did.

(Comparative Example 1) A patch plate was prepared using the flame-retardant epoxy resin-impregnated cloth prepared in Example 1 in place of the non-halogen epoxy resin-impregnated cloth, and the patch plate was used. Then, a metal foil-clad laminate was manufactured in the same manner as in Example 1.

(Comparative Example 2) In addition to the backing plate used in Comparative Example 1, an elastic body composed of an aramid fiber sheet, a glass fiber sheet and a fluoro rubber sheet [manufactured by Yamauchi Corporation, trade name: FGK20MK] was used. A metal foil-clad laminate was manufactured in the same manner as in Example 2, except that the production of the metal foil-clad laminate was repeated 100 times by using the same elastic body repeatedly.

(Evaluation and Results) The number of defective appearances of the metal foil-clad laminates obtained in each of Examples and Comparative Examples was evaluated. As a method, whether or not a tar-like foreign material or a concave portion considered to be caused by the foreign material is generated on the metal foil on the surface of the metal foil-clad laminate obtained at the 50th cycle and the 100th cycle. Was visually observed, and the number of occurrences was counted. In addition, both sides of the metal foil-clad laminate having a size of 50 × 50 cm were evaluated.

The results show that, as shown in Table 1, each of the examples has less appearance defects as compared with the comparative examples, and the manufacturing method of each of the examples is less likely to form foreign matter on the surface metal foil. It was confirmed that this was a method for producing a metal foil-clad laminate.

[0050]

[Table 1]

[0051]

The method of manufacturing a metal foil-clad laminate according to the present invention uses a backing plate having a metal foil layer as a surface layer of an insulating layer made of a glass cloth and a non-halogen epoxy resin composition. Thus, a method for manufacturing a metal-foil-clad laminate in which foreign substances and the like are unlikely to be formed on the metal foil on the surface is provided.

[Brief description of the drawings]

FIG. 1 shows a method for producing a metal foil-clad laminate according to the present invention.
FIG. 2 is a cross-sectional view illustrating one embodiment.

FIG. 2 shows a method for producing a metal foil-clad laminate according to the present invention.
It is sectional drawing explaining the backing plate of one Embodiment.

FIG. 3 shows a method for producing a metal foil-clad laminate according to the present invention.
It is sectional drawing explaining the backing plate of other embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Laminate 11 Flame-retardant epoxy resin impregnated cloth 12 Metal foil 20 Backing plate 21 Insulating layer 22 Metal foil layer 23 Elastic layer 30 Hot plate 40 Flat plate

Claims (5)

[Claims] 1. A required number of flame-retardant epoxy resin impregnated cloths in which a glass cloth is impregnated with a flame-retardant epoxy resin composition, and a metal foil is laminated on at least one outermost layer to form a laminate. In a method for manufacturing a metal-foil-clad laminate, which is produced by stacking a plurality of laminates to form a laminate, sandwiching the laminate with an organic backing plate, and further heating and pressing the laminate between hot plates, Is a glass cloth and a non-halogen epoxy resin composition on the surface of the insulating layer,
A method for producing a metal foil-clad laminate, which is a multilayer board having a metal foil layer. 2. The method for producing a metal foil-clad laminate according to claim 1, wherein the flame-retardant epoxy resin composition is a brominated epoxy resin composition. 3. An inner layer of the backing plate further comprising an elastic layer having elasticity sandwiched between an insulating layer made of glass cloth and a non-halogen epoxy resin composition. Item 3. The method for producing a metal foil-clad laminate according to Item 2. 4. The metal foil-clad laminate according to claim 3, wherein the elastic body is at least one selected from an aramid fiber sheet, a glass fiber sheet, a fluoro rubber sheet, and a composite thereof. Production method. 5. A laminate in which a required number of flame-retardant epoxy resin-impregnated cloths are laminated on both sides of an organic substrate on which a conductor circuit is formed, and a metal foil is laminated on at least one of the outermost layers. The method for producing a metal foil-clad laminate according to any one of claims 1 to 4, characterized in that: