JPS60203642A - Manufacture of composite laminate board - Google Patents

Abstract

PURPOSE:To manufacture a laminated board having excellent drill-ability, dimensional stability and interlaminar strength, by impregnating a nonwoven glass cloth with a resin varnish containing cellulosic fiber and inorganic filler, combining the prepreg obtained by drying the above impregnated cloth with a glass cloth prepreg, and hot-pressing the laminate. CONSTITUTION:A resin varnish containing 100pts.(wt.) of solid resin component, 5-40pts. of cellulosic fiber and 40-100pts. of inorganic filler is impregnated and dried in a nonwoven glass cloth, and the obtained prepreg is combined with a glass cloth prepreg and hot-pressed to obtain the objective composite laminate. The cellulosic fiber is pretreated with a water-soluble phenolic resin or melamine resin. The inorganic filler is preferably one having low Mohs hardness.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a composite laminate having good dimensional stability, drillability and glabella adhesion.

In recent years, with the miniaturization of electronic devices, the density of printed wiring boards has increased. For this reason, conventionally one wire was placed between lands with a pitch of 254, but recently
Two or three wires are often installed between lands with a vm pitch. However, although composite laminates used for printed wiring boards can be punched and are inexpensive, they have poor dimensional stability and cannot be used for high-density printed wiring boards. A composite laminate is a combination of glass cloth and glass nonwoven fabric as a base material.

As a result of detailed research to improve this problem, the present invention contains 5 to 40 parts by weight of cellulose fiber and 40 to 100 parts by weight of inorganic filler per 100 parts by weight of resin solid content. We have discovered that it is possible to produce a composite laminate with good dimensional stability by impregnating and drying a glass nonwoven fabric with a resin to obtain a prepreg, combining this with a glass fabric prepreg, stacking the required number of sheets and heating and pressurizing them.

Generally, resin moldings contain inorganic fillers because they undergo large dimensional changes due to heating. However, if 100 parts by weight or more of inorganic fillers are contained per 100 parts by weight of resin solids, Y.

The dimensional change in the Z direction becomes smaller. However, in composite laminated boards, the interlayer density and drilling workability of the glass cloth deteriorate. On the other hand, if the amount of inorganic filler is 40 parts by weight or less, X, Y.

Dimensional stability in the Z direction deteriorates.

However, even if the amount of inorganic filler is between 40 and 100 parts by weight, the dimensional stability is still unsatisfactory. It was possible.

Therefore, the present inventor conducted various studies and found that by incorporating cellulose fibers into the resin and further containing an inorganic filler, a composite laminate with good dimensional stability, drill workability, and interlayer adhesion was obtained. I was able to do something.

Cellulose fiber is 5% per 10,000 weight of resin solid content.
If the amount is less than 1 part by weight, dimensional stability cannot be greatly improved and it cannot be applied to high-density printed wiring boards. On the other hand, 4
If the amount is 0 parts by weight or more, the dimensional stability will be good, but the heat resistance will be poor.The glass nonwoven fabric used in the present invention is made by bonding glass fibers with a length of 2 to 80+ m with a binder such as epoxy resin or synthetic fiber. The glass cloth is the glass cloth conventionally used for laminates.

In the present invention, cellulose fibers, kraft fibers, linter fibers, etc. are preferably used, but are not particularly limited to those treated with water-soluble phenol resin, melamine resin, or the like. The inorganic filler may be silica powder, talc, kaolin, or the like, but is not particularly limited, and preferably has a low Mohs hardness.

The resin is preferably a thermosetting resin such as an epoxy resin or a phenol resin, but may also be a thermoplastic resin such as an engineering plastic. When preparing a metal foil-clad laminate, copper foil, aluminum foil, nickel foil, or the like may be appropriately used as the metal foil, and although it is not particularly limited, it is preferable that the adhesive surface be roughened to #1 or higher.

Next, examples of the present invention will be explained □Example epoxy resin (Epicoat 1001 manufactured by Yuka Shell, mp
, 70°C) 10,000 weight parts dicyandiamide 3.5 parts by weight and dimethylbenzylamine 0.4 weight parts were blended and a resin solid content of 65 weight % epoxy resin varnish was impregnated into plain weave glass to a resin amount of 41 weight % and dried. I got it. On the other hand, 65 parts by weight of silica powder and 30 parts by weight of linter fibers pretreated with a water-soluble phenol resin were mixed with 100 parts by weight of resin solids in the above epoxy resin varnish, and this was mixed with a glass nonwoven fabric (weighing 75 parts by weight). P/m') with a resin amount of 9
The prepreg was obtained by impregnating and drying so that the amount was 0%. Three sheets of the thus obtained glass nonwoven fabric prepreg were stacked, one glass cloth prepreg was placed on the outermost layer, and copper foil was layered on both sides, and the temperature was 170°C. °C1 pressure 20 kf /
Table 1 shows the physical properties of this laminate, which was laminated for 2 hours to obtain a double-sided steel-clad laminate with a thickness of 1.6 m.

Comparative Example 1 65 parts by weight of silica powder and 3 parts by weight of linter fibers pretreated with water-soluble phenol resin were added to 100 parts by weight of resin solids in the epoxy resin varnish used in the production of glass cloth Gripreg in the example. A prepreg was obtained by impregnating and drying the glass nonwoven fabric used in the examples to a resin amount of 899 parts by weight.

This prepreg was laminated and molded together with the glass cloth prepreg shown in the example under the same conditions to obtain a double-sided steel-clad laminate having a thickness of 1.6X. The physical properties of this laminate are shown in Table 1. Comparative Example 2 The epoxy resin varnish used in the production of the glass cloth prepreg in the example contained 100 parts by weight of resin solids, 65 parts by weight of silica powder, and a water-soluble phenol resin. A prepreg was obtained by mixing 60 parts by weight of linter fibers which had been pretreated with the following methods and impregnating and drying the mixture to obtain the glass nonwoven fabric trapping resin 't89A96 used in the examples.

This prepreg was laminated and molded together with the glass cloth prepreg shown in the example under the same conditions to obtain a double-sided copper-clad laminate having a thickness of 16 mm. The properties of this laminate are shown in Table 1.

Comparative Example 3 For 100 parts by weight of resin solids, 20 parts by weight of silica powder and 40 parts by weight of linter fibers pretreated with water-soluble two-nor resin were added to the epoxy resin face used to produce the glass cloth prepreg in the example. This was mixed and impregnated into the glass non-woven fabric used in the example to give a resin amount of 90 weight/gravity pressure and dried to obtain a prepreg.This prepreg was laminated and molded under the same conditions with the glass fabric prepreg shown in the example to give a thickness of 1. A double-sided copper-clad laminate with a length of .6 m was obtained. The physical properties of this laminate are shown in Table 1.

Comparative Example 4 The resin solid content of the epoxy resin used in the production of the glass cloth prepreg in Example 100, 120 parts by weight of silica powder, and 40 parts by weight of linter fibers pretreated with water-soluble phenol resin. A prepreg was obtained by impregnating and drying the glass non-woven fabric used in the examples with resin 11'89 weight 41[. This prepreg was laminated and molded together with the glass cloth prepreg shown in the example under the same conditions to obtain a double-sided copper-clad laminate having a thickness of 19.6 mm. The physical properties of this laminate are shown in Table 1.

Table 1 (Note 1) Adhesion between glass cloth and glass nonwoven fabric of ff1lJ board (Note 2) Evaluation after drilling 30,000 holes: O: Good ×
As is clear from Table 1, according to the present invention, a composite laminate with excellent dimensional stability, drill workability, and interlayer adhesion can be manufactured, and its industrial value is great.

patent applicant

Claims (1)

[Claims] 5 to 4 parts of cellulose fiber per 100 parts by weight of resin solids
A prepreg is obtained by impregnating and drying a glass nonwoven fabric with a resin face containing 0 part of electrolytic corrosion and 40 to 100 parts by weight of an inorganic filler.
A method for manufacturing a composite laminate, which is characterized by combining this with glass cloth prepreg and stacking the required number of sheets under pressure and heating.