JPH04345085A - Fluororesin multilayer laminated board - Google Patents

Abstract

PURPOSE:To make the plating property of the face of a fluororesin laminated board good and to prevent the face of another resin laminated board from being deteriorated by combining the following: the fluororesin laminated board which is composed of a fluororesin to which a plating catalytic filler has been added; and the laminated board composed of a resin other than fluororesin. CONSTITUTION:Glass cloths are impregnated with a fluororesin dispersion to which kaolin fine particles which have adsorbed palladium ions chemically have been added; they are backed; prepregs are obtained. Copper foils are piled up on both faces of the prepregs which have been piled up; this assembly is heated and pressurized at 380 deg.C; a fluororesin laminated board 1 containing a plating catalyst is obtained. Separely, glass cloths are impregnated with an epoxy resin and dried; prepregs are obtained; the prepregs are piled up on both faces of the flouroresin laminated board 1; in addition, copper foils 3 are piled up on both outer sides; this assembly is heated and pressurized at 180 deg.C; a fluororesin multilayer laminated where epoxy-resin laminated board 2 have been arranged on both faces is obtained. Thereby, a sodium treatment which has been executed to conventional fluororesin laminated boards is not required, and all inner walls can be plated well.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluororesin multilayer laminate that is economical and has good through-hole plating properties.

0002

[Prior Art] Conventionally, substrates for printed wiring boards are made of laminates made by impregnating glass or paper base materials with thermosetting resins such as polyimide, epoxy resins, unsaturated polyester resins, and phenolic resins and molding them under heat and pressure. use. However, in recent years, with the advancement in performance, there has been a trend to require laminates with low dielectric constants and dielectric loss tangents, and this has become a situation that cannot be met simply by using thermosetting resins as in the past. Therefore, polyphenylene oxide (PPO) and polyphenylene sulfide (PPS) have low dielectric constant and dielectric loss tangent and excellent heat resistance.
, thermoplastic resins called super engineering plastics such as polyetheretherketone (PEEK) have come to be used. In particular, fluororesins have begun to attract attention because of their low dielectric constant and dielectric loss tangent, excellent other electrical properties, and excellent heat resistance.

[0003] Fluororesin laminates are made by laminating prepregs obtained by impregnating glass cloth with fluororesin dispersion and drying them and then heating and pressing them, or by impregnating short glass fibers and fluororesin and then heating and pressing them. There is. However, although this conventional fluororesin laminate has excellent dielectric properties and heat resistance, it has poor adhesion with other materials because the resin is inert. Therefore, when plating the inner walls of through-holes made by drilling, it is necessary to perform special chemical treatment such as metallic sodium treatment. Although this treatment is effective for fluororesins, For plates, there is a problem of surface deterioration.

On the other hand, as the need for multilayering of fluororesin laminates increases, multilayering of fluororesin laminates alone is expensive, so multilayering of fluororesin laminates and other resin laminates is becoming more important. is possible. However, when through-holes are formed in this multilayer board and metal sodium treatment is applied to plate the inner wall, it is not appropriate because it degrades other resins, and the multilayer effect cannot be fully exhibited.

[0005] As disclosed in Japanese Patent Publication No. 50-31276, in order to improve the plating properties of the inner walls of through-holes in laminates using resins other than fluororesin, such as thermosetting resins such as epoxy resins and unsaturated polyester resins, There is a report that a plating catalytic filler is added to the above thermosetting resin. This addition has the effect of making it easier for the plating to precipitate when plating the inner walls of the through holes. These reports do not mention that a plating catalytic filler was applied to the production of fluororesin laminates.

[0006]

[Problems to be Solved by the Invention] The problem to be solved is to improve the plating properties of both resins, and to improve the plating properties of both resins while manufacturing a multilayer board that is a combination of a fluororesin laminate and other resin laminates. The objective is to develop a method that does not deteriorate the resin surface. The present invention improves the plating properties of the fluororesin laminate surface in place of the conventional metal sodium treatment,
It is an object of the present invention to provide a method that does not cause deterioration of other resin laminate surfaces.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a combination of a fluororesin laminate made of a fluororesin containing a plating catalytic filler and a laminate made of other resins. This is a multilayer laminate made of fluororesin.

[0008] The plating catalytic filler used in the present invention is
As mentioned in the prior art section, there have been reports regarding conventional resin laminates other than fluororesin. However, there are no optical technology or reports regarding fluororesin.

[0009] The above-mentioned plating catalytic filler has inert fine particles adsorbed on its surface to adsorb cations of metals belonging to group 8 of the periodic table. In manufacturing fluororesin laminates, it is necessary to heat and press at a high temperature of 400°C.
Palladium ions are suitable for plating catalytic fillers because they particularly require heat resistance. Kaolin, for example, is suitable as a particulate carrier for adsorbing this.

The fluororesin used is a tetrafluoroethylene resin, a tetrafluoroethylene-perfluoroalkvinyl ether copolymer resin, a tetrafluoroethylene-hexafluoropropylene copolymer resin, or a mixture thereof.

[0011] A method for adding a plating catalyst to a fluororesin is to mix fine kaolin particles adsorbed with palladium ions into a dispersion liquid of fine powder of a fluororesin. A glass fiber base material is impregnated with the obtained mixed solution and dried at about 400° C., and a plurality of sheets of the obtained prepreg are laminated with copper foil on both sides to form a fluororesin laminate. Separately, a laminate made of a resin other than fluororesin is made, and this and a fluororesin laminate are combined and integrally molded to form a fluororesin multilayer laminate.

The resin used for the combination laminate is preferably a thermosetting resin or a heat-resistant thermoplastic resin called super engineering plastic. The two laminates are integrated by a method of providing an adhesive layer other than a fluororesin that can be bonded at a temperature below the melting point or softening point and applying heat and pressure.

[0013]

[Operation] According to the present invention, a fluororesin laminate obtained by laminating a glass fiber base material impregnated with a fluororesin containing a plating catalytic filler and heating and pressurizing the fluororesin laminate and a laminate made of a resin other than the fluororesin are laminated and integrated. to obtain a multilayer fluororesin laminate. If the inner walls of the through-holes in this multilayer board are plated by the usual method, there is no need for the sodium treatment that is conventionally applied to fluororesin laminates, and the plating can be applied to all the inner walls.

[0014] A plating layer is formed by using palladium ion carrier fine particles mixed in the fluororesin and bonded to the fluororesin layer as nuclei for plating precipitation. Therefore, since the fluororesin is inert, it cannot be plated,
This can be explained as the need for sodium treatment to activate the fluororesin.

[0015]

【Example】

Example 1 Example 1 of the present invention will be described based on FIG. 1. Glass cloth (Nittobosha, WE116-104) was impregnated with a fluororesin dispersion (Mitsui DuPont Fluorochemical Co., Ltd., Polyflon TFE) to which 5% by weight of kaolin fine particles with palladium ions chemically adsorbed was added and sintered to obtain a prepreg. Ta. Copper foil 3 of 36 μm is layered on both sides of this stack, and heated and pressurized at 380° C. and 20 kg/cm2 to achieve a
A 6 mm thick fluororesin laminate 1 containing a plating catalyst was obtained.

Separately, a prepreg obtained by impregnating and drying the same glass cloth with epoxy resin as above was layered on both sides of the fluororesin laminate 1, and then copper foil 3 was layered on both outer sides of the prepreg, and heated at 180° C. and weighed 20 kg. / cm2 and apply heat and pressure to both sides.
．． A fluororesin multilayer laminate was prepared with a 2 mm epoxy resin laminate 2 arranged thereon.

Example 2 Example 2 will be explained based on FIG. 2. A predetermined pattern of circuits is provided on a plated catalytic filler-containing fluororesin laminate 1 obtained in the same manner as in Example 1. Epoxy resin laminates 2 obtained in the same manner as in Example 1 were placed on both sides of the epoxy resin laminate 2 and integrated to form a fluororesin multilayer laminate. A through hole was formed in this by drilling, and the through hole plating layer 4 was deposited by sequentially immersing it in a plating treatment solution.

Comparative Example Comparative Example 1 A conventional method carried out as Comparative Example 1 will be explained based on FIG. 3. A fluororesin multilayer laminate was obtained in the same manner as in Example 2, except that no plating catalytic filler was added. Furthermore, through-holes were made by drilling and plating was performed.

Comparative Example 2 The method carried out as Comparative Example 2 is shown in FIG. A fluororesin multilayer laminate was produced in the same manner as in Example 2, except that no plating catalytic filler was added, and through holes were formed in it. This was immersed in a metal sodium solution (Junkosha, Tetra Etch) to roughen the inner wall of the through hole, and then plated in the same manner as in Comparative Example 1.

[0020]

Effects of the Invention As shown in Figure 1, the fluororesin multilayer laminate of the present invention is composed of a combination of a fluororesin laminate and an epoxy resin laminate, but unlike a fluororesin laminate made only of fluororesin laminates, the manufacturing cost is lower. is cheaper and more economical.

Furthermore, as shown in FIG. 2, a plating layer 4 is also formed on the fluororesin layer on the inner wall of the through hole made by drilling by the method of the present invention. On the contrary,
If plating catalytic filler is not added to fluororesin,
As shown in FIG. 3, a plating layer is formed on the epoxy resin layer, but not on the fluororesin layer. Furthermore, when plating is performed by metal sodium treatment using the conventional method, a plating layer is formed on the fluororesin layer as shown in FIG. 4, but the inner wall 5 of the epoxy resin laminate deteriorates and no plating adheres to it.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a fluororesin multilayer laminate of the present invention.

FIG. 2 is an explanatory diagram of through-hole plating of the fluororesin multilayer laminate of the present invention.

FIG. 3 is an explanatory diagram of through-hole plating by a conventional method.

FIG. 4 is a cross-sectional view for identifying comparative examples.

[Explanation of symbols]

1 Fluororesin laminate with plating catalytic filler 2
Epoxy resin laminate 3 Copper foil 4 Through-hole inner wall plating layer

Claims (3)

[Claims] 1. A fluororesin multilayer laminate comprising a fluororesin laminate made of a fluororesin to which a plating catalytic filler has been added and a laminate made of a resin other than the fluororesin. 2. The fluororesin multilayer laminate according to claim 1, wherein the resin other than the fluororesin is a thermosetting resin. 3. The fluororesin multilayer laminate according to claim 1 or 2, wherein the resin other than the fluororesin is an engineering plastic.