JPS6237150A - Metallic-foil lined 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 [Technical Field] The present invention relates to a metal foil-clad laminate that suppresses dimensional changes and is used in electrical and electrical equipment, electronic equipment, computing equipment, communication equipment, and the like.

[Background technology]

Conventionally, paper-based phenolic laminates and glass cloth-based epoxy V laminates have been provided that have metal foil attached to one side, but these laminates have metal foil placed on one side of the same resin-impregnated base material. Because it is laminated and molded, the dimensional changes between the metal foil side and the resin-impregnated base material side are different, causing large warpage. As a countermeasure to this problem, attempts have been made to improve dimensional changes by combining resin-impregnated base materials with the same base material but with different resin content, but this method requires a large amount of resin overall and the work in the process is complicated. There was a problem.

[Purpose of the invention]

An object of the present invention is to provide a metal foil-clad laminate that exhibits small dimensional changes and, therefore, small warpage.

[Disclosure of the invention]

In the present invention, a required number of resin-impregnated base materials that have been impregnated with a resin varnish and dried are stacked on one side, a metal foil is arranged on one side, and the other side is coated with the resin-impregnated base material on a base material having a larger weight than the above-mentioned base material. A resin-impregnated base material placed on the opposite side of the metal foil for a metal foil-clad laminate, characterized in that it is made by laminating and molding a resin-impregnated base material impregnated with resin varnish and dried to the same weight as the metal foil. This means that the amount of resin in the material is substantially reduced, and the dimensional stability with the metal foil is balanced, so warping can be reduced, and the overall weight can be kept constant, making the process easier. There are important points that will not make the work complicated. The present invention will be explained in detail below.

The resins used in the present invention include phenolic resin, cresol resin, epoxy resin, unsaturated polyester resin, melamine resin, polyimide, polybutadiene, polyamide, polyamideimide, polyphenylene sulfide, polyphenylene oxide, polysulfone, polybutylene terephthalate, and ether ether chthon,
Fluorinated resins, etc. alone, modified products, mixtures, etc. are used, and water, methyl alcohol, acetone, cyclohexanone, styrene, etc. Woven fabrics, nonwoven fabrics, mats, paper, or combinations of these are made of inorganic fibers such as Aspect, organic synthetic fibers such as polyester, polyamide, polyvinyl alcohol, acrylic, and natural fibers such as cotton, but metal foil Only the base material weight of the resin-impregnated base material disposed on the opposite side needs to be large, preferably 39/nl or more,
Furthermore, it is necessary to reduce the amount of impregnated resin by the amount corresponding to the increased basis weight, and the number of sheets used is usually one, but there is no particular limitation. The metal foil can be made of copper, aluminum, Niracle, iron, etc. alone or an alloy thereof, and if necessary, can be used with an adhesive layer formed on one side.

The present invention will be explained below based on examples.

Example 1 A paper base material with a weight of f175 F/Y" was impregnated with phenolic resin Waninu and dried to obtain a base material impregnated with a resin of 1507β (referred to as prepreg A). Separately, a paper base material with a weight of 80 was impregnated with phenol resin. Impregnated with resin varnish and dried to 150 V/nf
A resin-impregnated base material (referred to as prepreg B. 2 was obtained. 06 sheets of prepreg were stacked on top of each other, and a copper foil coated with an adhesive was placed with the adhesive side facing the prepreg side, and then the prepreg was layered. A laminate with 81 sheets of prepreg placed on the other side of A was molded at lo pressure.

Lamination molding was carried out for ω minutes at 160° C. and 160° C. to obtain a single-sided copper-clad base phenol m-layer board.

Example 2 A glass cloth base material having a weight of 104 pWl was impregnated with epoxy resin Waninu containing a curing agent, and dried. A # resin-impregnated base material (referred to as prepreg C) was obtained. Separately, a glass cloth base material with a weight of 1097β was impregnated with epoxy resin Waninu containing a curing agent and dried to obtain a resin-impregnated base material (referred to as prepreg D) with a weight of 1509/nl.Five sheets of prepreg C were stacked. A laminate with a 5 micron thick copper foil placed on the surface and 06 prepreg sheets placed on the other side of the prepreg C was molded at a pressure of 50°C for 120 minutes at 170'Q.
! A one-sided copper-clad glass cloth base epoxy laminate was obtained by molding.

Comparative Example 1 06 sheets of the same prepreg as in Example 1 were stacked and a thickness of 35
A bonded body in which micron adhesive-coated copper foil was arranged with the adhesive side facing the prepreg side was treated in the same manner as in Example 1 to obtain a single-sided copper-clad paper-based phenol laminate.

Comparative Example 2 06 sheets of the same prepreg as Example 2 were stacked and a thickness of 35
A laminate with micron copper foil arranged thereon was treated in the same manner as in Example 2 to obtain an epoxy laminate with a single-sided steel-clad glass cloth base.

〔Effect of the invention〕

As is clear from Table 1, the dimensional change rate and warpage of the metal foil-clad laminates of Examples 1 and 2 and Comparative Examples 1 and 2 are good, and the performance of the metal foil-clad laminates of the present invention is good. I confirmed that there is.

Table 1 Note: Vertical direction, coefficient of thermal expansion*2 After absorbing moisture for 4 days at 80% humidity and I°C, humidity %
, Warpage after 4 days of dehumidification at lOoC.

Claims (2)

[Claims] (1) The required number of resin-impregnated base materials, which are made by impregnating the base material with resin varnish and drying them, are piled up, metal foil is placed on one side, and the resin-impregnated base material is placed on the other side of a base material with a larger weight than the above base material. A metal foil-clad laminate, characterized in that it is formed by laminating and molding a resin-impregnated base material impregnated with resin varnish and dried so as to have the same weight as . (2) The metal foil-clad laminate according to claim 1, wherein the base material basis weight of the resin-impregnated base material disposed on the opposite side of the metal foil is 3 g/m^3 or more.