JPS63290734A - Laminated sheet for electricity - Google Patents

Abstract

PURPOSE:To obtain a heat-resistant laminated sheet for a high-frequency circuit and electricity, which is superior in dimensional stability, by a method wherein specific laminated body is laminated inbetween the number of necessary sheets of fluororesin-impregnated bases or onto the top and bottom of the same for unification. CONSTITUTION:A laminated body obtained by arranging a metallic foil inbe tween the number of necessary sheets of fluororesin-impregnated bases or onto the top and bottom of the same through a fluororesin film, to which stress relaxation treatment has been performed, is laminated for integrating. The entire fluororesin can be used for the fluororesin. The base is either an indepen dent of combined base of woven cloth, nonwoven cloth, mat, felt, net, cheese cloth or paper composed of an inorganic fiber, an organic synthetic fiber or a natural fiber. It is preferable that stress relaxation treatment necessary for the flouroresin film is effected by heat treatment whose treatment speed is fast. A metallic foil composed of a single one or an alloy or a composition of copper, aluminum, iron, nickel or zinc can be used. With this construction, dimensional stability of a laminated sheet for electricity becomes favorable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an electrical laminate for a printed wiring board used in electronic equipment, electrical equipment, computers, communication equipment, etc.

[Background technology]

For heat-resistant high frequency circuits (The electrical laminate used is a fluororesin laminate. However, the problem with fluororesin laminates is that they lack dimensional stability because they require high-temperature molding.

[Purpose of the invention]

An object of the present invention is to provide a heat-resistant electrical laminate for high-frequency circuits with excellent dimensional stability.

[Disclosure of the invention]

The present invention is characterized in that it is formed by laminating and integrating a laminate in which a required number of fluororesin-impregnated base materials are provided with metal foil between the base materials and/or on the upper and lower surfaces via a stress-relaxed fluororesin film. The present invention will be described in detail below, since the above object has been achieved for the purpose of producing a laminate for use in the present invention.

The fluororesin used in the present invention includes tetrafluoroethylene resin, tetrafluoroethylene perfluorovinyl nylon 5"f
Any fluororesin can be used, such as iy copolymer, tetrafluoroethylene hexafluoride propylene copolymer, tetrafluoroethylene ethylene copolymer, trifluoroethylene chloride resin, and the like. The base material is free of glass, asbestos, etc.
It is a single or combination base material such as woven fabric, non-woven fabric, mat, felt, net, cheesecloth or paper made of organic synthetic fibers such as ates, polyester, polyacrylic, polyurethane, polyvinyl alcohol, polyamide, and natural fibers such as cotton. . Furthermore, the base material can be treated with a silane coupling agent or the like to improve the penetration and bonding between the base material and the resin.

As the fluororesin film, any fluororesin film can be used as described above, but stress relaxation treatment such as heat treatment, physical treatment, chemical treatment, etc. is required. As the stress-relaxing heat treatment, it is preferable to use a heat treatment with a fast processing speed. As the metal foil, metal foil made of copper, aluminum, iron, nickel, zinc, etc. alone, alloy, or composite can be used, and if necessary, an adhesive layer can be provided on one side to improve adhesive strength. You can also do so. Examples of lamination and integration methods include a press method, a multi-roll method, a double belt method, and a pressureless method using the own weight of the laminate.

The present invention will be explained below based on examples.

Example A lath cloth with a thickness of Wμ is impregnated with tetrafluoroethylene resin (manufactured by Daikin Industries, Ltd., product name: Polyflon TFE) so that the resin amount is 10% by weight (hereinafter simply referred to as %), and then fired to obtain fluorine. A polytetrafluoroethylene resin film with a thickness of 10 μm, which had been heat-treated at 250"C for (up to) minutes to relieve stress, was placed between the 10 resin-impregnated base materials and on the upper and lower surfaces. A laminate with a copper foil having a thickness of 0.0350 on the outermost side was molded at a molding pressure of kg/d at 380°C.
An electrical laminate was obtained by molding for 0 minutes.

Comparative Example An electrical laminate was obtained by processing in the same manner as in the Example except that the polytetrafluoroethylene resin film of the Example was used as it was without being heat-treated.

〔Effect of the invention〕

9! The dimensional stability of the electrical laminates of Examples and Comparative Examples was the first.
As is clear from the table, the performance of the present invention was good, confirming the superiority of the electrical laminate of the present invention.

Table 1

Claims (2)

[Claims] (1) An electrical device characterized by being formed by laminating and integrating a laminate in which a required number of fluororesin-impregnated base materials are provided with metal foil between the base materials and/or on the upper and lower surfaces via a stress-relaxed fluororesin film. laminate board. (2) The electrical laminate according to claim 1, wherein the stress relaxation treatment is a heat treatment.