JPS59109347A - 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] The present invention relates to a laminate used for IC circuits and the like.

Conventionally, printed wiring boards (PWB) include paper phenol laminates, paper epoxy laminates, glass epoxy laminates, glass polyimide laminates, and other laminates to which metal foil such as copper foil is attached, or A ceramic substrate with metal foil such as copper foil attached is used. However, by using the above-mentioned laminated board, it is difficult to increase the density of the printed wiring board, increase the number of layers (multilayer wiring), or increase the calculation speed.

On the other hand, if a ceramic substrate is used, the size of the printed wiring board is limited because it is difficult to manufacture a large-sized one and the ceramic substrate is easily broken.

The inventors focused on laminates that do not have the problem of limited size, and aimed to increase the density of printed wiring boards by lowering the coefficient of thermal expansion of laminates and improving their dimensional stability, especially under heat. We conducted repeated research in an attempt to increase the calculation speed by increasing the number of layers and by lowering the dielectric constant of the laminate. As a result, it was discovered that these problems could be solved by including a quartz component in the base material, and the present invention was hereby completed.

That is, the present invention provides a laminate formed by laminating and molding a predetermined number of resin-impregnated base materials, wherein at least one of the resin-impregnated base materials is made of quartz fiber yarn and glass fiber yarn. The gist of this product is a laminate that is characterized by being made of Ml-woven composite fabric. The present invention will be explained in detail below.

A laminate is made by laminating and molding a predetermined number of resin-impregnated base materials (prepregs), and in the laminate according to the present invention, at least one of the resin-impregnated base materials is made of quartz fiber yarn. It differs from conventional products in that it is a composite fabric woven using glass fiber threads. Since the above-mentioned composite fabric is used, the coefficient of thermal expansion of the laminate is low [about 10-''n/°C when polyimide resin (Kelimide 601) is used as the impregnating resin];
In particular, the dimensional stability under heat is improved and the dielectric constant is lowered [polyimide resin (Kelimide 60
1) is approximately 4 x 10" Hz or less]. Furthermore, when using a composite fabric such as the one described above, processability is improved compared to when using a quartz fiber cloth made only of quartz fiber threads. For example, when processing a laminate made using a resin-impregnated base material made by impregnating the composite cloth with polyimide resin (Kelimide 601), use a resin-impregnated base material made by impregnating a quartz fiber cloth with the same resin. Compared to machining a laminate made using a laminate, the life of the machining drill teeth is 1.
It turned out to be 5 times more.

The composite fabric is preferably woven so that an appropriate number of quartz fiber threads and glass fiber threads are alternately arranged, and the two are evenly arranged as a whole without shifting.

For example, composite fabrics such as those shown in FIGS. 1 and 2. In the composite fabric shown in Fig. 1, two quartz fiber threads 1 and two glass fiber threads 2 are alternately arranged as warp threads, and one thread of both is arranged alternately as weft threads. . The composite fabric shown in Figure 2 has one quartz fiber yarn 1 and five glass fiber yarns 2 alternately arranged as warp threads, and one each of the two as weft threads. There is.

The quartz fiber yarn used in composite fabrics contains silicon dioxide (
S i O2) content is 96-99%
It is better if the level is higher. However, it is not limited to this range. The type of glass fiber yarn is not particularly limited. For example, E-glass (Owens-Co
(manufactured by Fiber Glass), etc. are used. As the resin to be impregnated into the composite cloth, the same resins as those commonly used in the past are used, and polyimide resins, epoxy resins, and polybutadiene resins are preferably used.

When a type of resin-impregnated base material other than the composite cloth impregnated with a resin is used, the type is not particularly limited. For example, glass cloth impregnated with epoxy resin or polyimide resin, quartz fiber cloth impregnated with polyimide resin, etc. are used. The type of resin-impregnated base material used, the number of sheets, and the position of overlapping are as follows:
Laws need to be established as appropriate depending on the purpose of use of the laminate.

In addition, if necessary, #i may be applied to one or both sides of the laminate.
When manufacturing a metal foil-clad laminate to which metal foil such as foil is attached, the laminate is formed by laminating a predetermined number of resin-impregnated base materials, and the metal foil is applied to one or both sides of the laminate and then molded. After the laminate is made, metal foil is attached to either or both sides of the laminate.

The laminate according to the present invention is constructed as described above, and since at least one of the resin-impregnated base materials is a composite cloth as described above, the laminate has a low coefficient of thermal expansion. In particular, it has excellent dimensional stability under heat. Therefore, it becomes possible to easily increase the density and multilayer of printed wiring boards. A printed wiring board equipped with this laminate is a leadless IC chip (ceramic type,
It is very suitable for use as a carrier (plastic type, etc.). Furthermore, since the dielectric constant is low, calculation speed can be easily increased. Moreover, the workability is relatively good.

Next, Examples and Comparative Examples will be described.

〔Example〕

In the following manner, a laminated board of an example having copper foil adhered to both sides was produced.

The composite fabric serving as the base material is plain woven with one quartz fiber thread and one glass fiber thread arranged alternately, and has a thickness of 0.18 f1. The arrangement of braided threads is 42/251
m, the weft yarn arrangement was 32 threads/25 mm. The composite cloth as described above was impregnated with polyimide so that the resin amount was 50% by weight to form a resin-impregnated base material. Six sheets of this resin-impregnated base material were stacked, and a layer of 35 μm thick was added on the top and bottom surfaces. After combining the copper foil, heat to 165℃,
Laminate molding was performed by heating and pressurizing at 70 kg/crA for 90 minutes to obtain a laminate.

A comparative laminate with copper foil attached on both sides was made with a thickness of 0.1
It was produced in the same manner as in the example except that 8 tm glass cloth was used as the base material.

The thermal expansion coefficient and dielectric constant of the laminates of Examples and Comparative Examples were measured. The measurement results are shown in Table 1.

Table 1 From Table 1, it can be seen that the laminates of the examples have lower coefficients of thermal expansion and dielectric constants than those of the comparative examples.

[Brief explanation of drawings]

FIGS. 1 and 2 are structural explanatory diagrams of an example of a composite fabric used in a laminate according to the present invention. 1...Quartz fiber yarn 2...Glass fiber yarn Agent Patent attorney Takehiko Matsumoto

Claims (2)

[Claims] (1) A laminate formed by laminating and molding a predetermined number of resin-impregnated base materials, in which at least one of the resin-impregnated base materials is a composite woven using quartz fiber yarn and glass fiber yarn. A laminate board characterized by being made of cloth. (2) The laminate according to claim 1, wherein the composite fabric is woven such that an appropriate number of quartz fiber threads and glass fiber threads are alternately arranged.