JPH03226B2 - - Google Patents

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 with metal foils such as copper foil attached, or A ceramic substrate with copper foil or the like attached is used. However, by using the above-mentioned laminate, 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 a laminate that does not have the problem of limited size, and reduced the thermal expansion coefficient of the laminate.
In particular, by improving dimensional stability under heat, it is possible to increase the density and multilayer of printed wiring boards, and by lowering the dielectricity of the laminate, it is possible to increase the calculation speed. We conducted repeated research in an attempt to make it possible to measure the 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, in which at least one of the resin-impregnated base materials is woven using quartz fiber yarn and glass fiber yarn. The gist of the product is a laminate that is characterized by being made of a composite fabric. This invention will be explained in detail below. A laminate is made by laminating and molding a predetermined number of resin-impregnated base materials (prepreg), and in the laminate according to the present invention, at least one of the resin-impregnated base materials is made of quartz fiber. It differs from conventional fabrics in that it is a composite fabric woven using yarn and glass fiber yarn. Since the above-mentioned composite fabric is used, the thermal expansion coefficient of the laminate is low (approximately 10 ^-6 mm/mm°C when polyimide resin (Kelimide 601) is used as the impregnating resin), and it is particularly resistant to heat. The dimensional stability during heating is improved, and the dielectric constant is also lowered (approximately 4×10 ⁶ Hz or less when polyimide resin (Kelimide 601) is used as the impregnating resin). Moreover, when a composite fabric such as the one described above is used, workability is better than when using a quartz fiber yarn made only of quartz fiber yarn. For example, when processing a laminate made using a resin-impregnated base material made by impregnating the composite cloth with polyimide resin (Kelimide 601), a laminate made using a resin-impregnated base material made by impregnating a quartz fiber cloth with the same resin is used. It was found that the life of the machining drill teeth was 1.5 times longer than when machining ivy laminates. Preferably, the composite fabric is 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, Figures 1 and 2
It is a composite fabric as shown in the figure. The composite fabric shown in Figure 1 has 1 quartz fiber yarn as the warp.
and glass fiber threads 2 are arranged alternately,
One each of the two weft threads are arranged alternately. The composite fabric shown in FIG.
One quartz fiber thread 1 and glass fiber thread 2 are used as warp threads.
Five threads are arranged alternately, and one thread of each is arranged alternately as a weft thread. The quartz fiber yarn used in composite fabrics has a silicon dioxide (SiO ₂ ) content of 96~
It is better if it is as high as 99%. However, it is not limited to this range. The type of glass fiber yarn is not particularly limited. For example, E-glass (manufactured by Owens-Corning Fiber Glas) or the like is 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 thread impregnated with polyimide resin, etc. are used. The type of resin-impregnated base material to be used, the number of the base materials, and the position of overlapping must be appropriately determined depending on the intended use of the laminate. In addition, when making a metal foil-clad laminate in which metal foil such as copper foil is adhered to one or both sides of the laminate, one or both sides of the laminate formed by laminating a predetermined number of resin-impregnated base materials may Metal foil is applied to both sides and then molded, or after a laminate is made, metal foil is attached to one or both sides. The laminate according to the present invention is constructed as described above, and since at least one of the resin-impregnated base materials is made of the 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. Printed wiring boards equipped with this laminated board are leadless IC chips (ceramic type,
Very suitable for use as a carrier (plastic type, etc.). Furthermore, since the induction factor is low, it becomes easy to increase the speed of calculation. Moreover, the workability is relatively good. Next, Examples and Comparative Examples will be described. [Example] In the following manner, a laminated board according to an example in which copper foil was adhered to both sides was produced. The composite fabric that serves as the base material is plain woven with alternating quartz fiber threads and glass fiber threads, with a thickness of 0.18 mm and a warp arrangement of 42/25 threads.
mm, with a weft arrangement of 32 threads/25 mm. A resin-impregnated base material was prepared by impregnating the composite cloth as described above with polyimide so that the resin amount was 50% by weight. Six sheets of this resin-impregnated base material were stacked, and copper foil with a thickness of 35 μm was placed on the top and bottom surfaces, and then laminated by heating and pressurizing at 165 ° C and 70 Kg / cm ² for 90 minutes, A laminate was obtained. A comparative laminate having copper foil adhered to both sides was produced in the same manner as in the example except that glass cloth with a thickness of 0.18 mm 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] 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 the drawing]

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 thread, 2...Glass fiber thread.

Claims (1)

[Scope of Claims] 1. 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
A laminate board characterized in that the base material of the sheet is a composite cloth woven using quartz fiber threads and glass fiber threads. 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.