JPH0421437A - Laminated sheet for electrical use - Google Patents

Abstract

PURPOSE:To obtain a laminated sheet for electrical use almost free from electric property irregularities and warping by applying a fluorine resin film on the upper surface and the lower surface of a required number of sheets of bases material and integrating a laminated product with a metal foil arranged on an outermost layer, if necessary, into a single body. CONSTITUTION:Woven cloth, unwoven cloth or mat consisting of inorganic fiber, organic synthetic fiber or natural fiber, or paper, or a combination of these materials is used as a base material. Fluorine resin film is used as film and the film is 0.005 to 0.5mm-thick, if necessary, with the addition of an inorganic filler or a fibrous filler. A metal foil is such as copper or aluminum used alone or their alloys or composite foil. In addition, an adhesive layer is provided on one side of the metal foil to improve its adhesive properties. An integral processing technique adopted is such as pressing, multi-daylight pressing or multi-rolling.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrical laminate used in electronic equipment, electrical equipment, computers, communication equipment, etc.

[Conventional technology]

Conventional electrical laminates made of fluororesin are obtained by repeatedly impregnating and drying a base material with a fluororesin emulsion to adhere the required amount of resin to the base material. There were problems with poor impregnating properties, variations in electrical performance, and increased warping.

[Problems to be Solved by the Invention] As described in the prior art, electrical laminates using prepreg made by impregnating and drying a fluororesin emulsion into a base material have variations in electrical performance and large warpage ( The present invention has been made in view of the above-mentioned problems in the technology of the embodiments, and its purpose is to provide an electrical laminate with less variation in electrical performance and less warpage. .

[Means for solving problems]

The present invention is an electrical product characterized by integrating a laminate in which a required number of base materials are each provided with a fluororesin film on the upper and/or lower surfaces, and if necessary, a metal foil is provided on the outermost layer. Because it is a laminate, the molten resin is press-fitted into the base material, so that the base material is uniformly impregnated with the resin, reducing variations in electrical performance and warping.The present invention will be described in detail below.

The base materials used in the present invention include woven fabrics, non-woven fabrics made of inorganic fibers such as glass and asbestos, organic synthetic fibers such as polyester, polyacrylic, polyvinyl alcohol, polyamide, polyimide, polyphenylene sulfide, and polyurethane, and natural fibers such as cotton; 77) Alternatively, the base material may be treated with a compulsing agent or the like in advance using a base material made of Mizuki or a combination thereof. Examples of fluororesin films include tetrafluoroethylene resin, tetrafluoroethylene perfluorovinyl ether copolymer, tetrafluoroethylene hexafluoropropylene copolymer, tetrafluoroethylene ethylene copolymer, and trifluorochloride ethylene resin. Any film made of fluororesin can be used, such as the following. The thickness of the film is O, OO5~0.5
mm is preferable, and if necessary, the fluororesin may contain inorganic fillers such as aluminum hydroxide, talc, silica, alumina, calcium carbonate, magnesium carbonate, etc., and fibrous materials such as glass fiber chips, asbestos, wood powder, pulp, and cotton powder. Fillers can also be added. As the metal foil, single, alloy, or composite foils of copper, aluminum, iron, nickel, zinc, etc. are used, and if necessary, an adhesive layer can be provided on one side of the metal foil to further improve adhesiveness. can. As the unitary fixing means, a press, a multi-stage press, a multi-roll, etc. are used.

The present invention will be explained below based on examples.

[Example 1] A 0.1 mm thick tetrafluoroethylene hexafluoropropylene copolymer film (manufactured by Daikin Industries, Ltd., Neoflon Film ), and the outermost layer was a 0.035 mm thick adhesive-coated copper foil with the adhesive side facing the film.
An electrical laminate with a thickness of 1.2 mm was obtained by lamination molding using a minute press.

[Comparative example]

The same tetrafluoroethylene hexafluoropropylene copolymer emulsion as in the example was prepared to a thickness of 0 so that the resin amount was 30% by weight.
．． A laminate in which 7 sheets of impregnated and dried prepreg were stacked on a 15 m long glass cloth, and the same F4 foil as in the example was placed on each of the outermost layers was treated in the same manner as in the example to produce a 1.2 mm thick electrical grade. A laminate was obtained.

The performance of the electrical laminates of Examples and Comparative Examples is shown in Table 1.

Table 1 [Effects of the Invention] The present invention is constructed as described above. The electrical laminate having the structure described in the claims has the effect of reducing variations in electrical performance and warping.

Claims (1)

[Claims] (1) An electrical device characterized by being formed by integrating a laminate in which a fluororesin film is arranged on the upper and/or lower surfaces of each of the required number of base materials, and if necessary, a metal foil is arranged on the outermost layer. laminate board.