JPH03183186A - Laminated board for electrical use - Google Patents

Abstract

PURPOSE:To offer laminated boards for electrical use excellent in high-frequency characteristics by using a resin-impregnated fluororesin paper having a specific thickness for at least a piece of resin-impregnated base material. CONSTITUTION:A laminated board for electrical use monolithically prepared from laminates of a predetermined number of resin impregnated base materials each metal-foiled in the top and bottom uses resin-impregnated fluororesin paper for as least a piece of resin-impregnated base material. The fluororesin paper must be 30-350mum in thickness: less than 30mum is susceptible to damage in handling, and more than 350mum to damage in resin impregnation. The metal foil may be a foil from a simplex, an alloy, or a complex of copper, aluminum, nickel, zinc, iron, etc: it may be coated with an adhesive layer in one side for further improvement of adhesiveness as necessary.

Description

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

[Conventional technology]

Conventionally, electrical laminates have been made by laminating and molding a laminate of paper or glass woven fabric impregnated with 7-dinol resin, epoxy resin, or polyimide resin and then drying a required number of resin-impregnated base materials and metal foil. However, the dielectric constant of this electrical laminate is 5.0 when using epoxy resin-impregnated glass cloth.
In the case of polyimide resin glass cloth, it is relatively large at 4.0, so when used as a printed wiring board, the high frequency characteristics are insufficient, and restrictions are added for use in high frequency arithmetic circuits and communication equipment circuits. Ta. For this reason, attempts have been made to use fluororesin-impregnated kraft paper or fluororesin-impregnated glass nonwoven fabric, which are kraft paper or glass woven cloth impregnated with pre-resin, but since fluororesin liquid can only be supplied in the form of an emulsion, In order to give the material the required resin curve, it is time-consuming to repeat impregnation and drying, and furthermore, it is necessary to heat the material above the melting point of the fluororesin during laminated molding, which poses the problem of requiring high-temperature molding at 250°C or higher. is.

[Problem that the invention seeks to solve]

As described in the prior art, electrical laminates made of resin-impregnated base materials in which kraft paper or glass woven cloth is impregnated with epoxy resin or polyimide resin lack high frequency characteristics. On the other hand, electrical laminates made of resin-impregnated materials such as kraft paper and glass woven fabric with 2J resin have low productivity. The present invention has been made in view of the above-mentioned problems in the conventional technology, and its purpose is to provide an electrical seed layer*1 with excellent high frequency characteristics while maintaining productivity.
There is so much to offer.

[Means for solving problems]

The present invention provides an electrical laminate formed by integrating a laminate in which a required number of resin-impregnated substrates are provided with metal foil on the upper and/or lower surfaces, in which at least one of the resin-impregnated substrates is Thickness 30
This electrical laminate is characterized by being made of resin-impregnated fluororesin vapor of ~350 microns, so it has good high-frequency properties and can maintain productivity except for the use of fluororesin as the impregnating resin. The present invention will now be described in detail.

Examples of resins for the resin-impregnated base material discussed in the present invention include phenolic resin, cresol resin, EBOKI V resin, unsaturated polyester 41N resin, melamine resin, polyimide, polybutadiene, polyamide, polyamideimide, polysulfone, polyphenylene sulfide, and polyphenylene oxide. , polybutylene terephthalate, polyether ether ketone, fluororesin, etc. alone, modified products, and mixed materials are used. If necessary, solvents such as water, methyl alcohol, acetone, cyclohexone, and styrene are used to adjust the viscosity. The base materials are trifluoroethylene chloride resin, tetra7fluoroethylene resin, and tetrafluoroethylene hexafluoropropylene copolymer resin.

Paper made from fluororesin fibers such as tetra-ethylene perfluorovinyl ether copolymerized resin and has a thickness of 30 to 3
50 micron 7. The base resin paper may be used for all of the required number of resin-impregnated base materials, or only for the central portion where the required number of sheets are laminated, or only for the outermost layer, or alternatively, laminated alternately with ordinary resin-impregnated base materials. It is optional, but it is necessary to use it on at least one of the resin-impregnated substrates. Thickness of free resin paper is 30-35
It needs to be 0 microns. That is, if it is less than 30 microns, it will be easily damaged during handling, and if it exceeds 350 microns, it will be easily damaged during resin impregnation. As the metal foil, single, alloy, or composite foils of copper, aluminum, aluminum, zinc, iron, etc. are used, and if necessary, to further improve visibility, a viewing agent may be added to one side of the metal foil. #
You can also set it up. When it comes to lamination and integration, presses, multi-stage presses, multi-rolls, double belts,
Any method such as pressureless heating can be selected, and the method is not particularly limited and will be described based on the following embodiments of the present invention.

Example A hardening agent-containing epoxy resin was added to a 100 micron thick 7-I resin paper made from a 7-ethylene perfluoroalkyl vinyl ether copolymer resin fiber so that the amount of resin after drying would be 45% by weight. Pjt layered body 'I' in which 6 sheets of resin-impregnated fluororesin paper impregnated with resin varnish, dried and then placed on the bed are stacked, and a steel foil with adhesive of 0.0351 nI is arranged on the upper and lower surfaces respectively - molding pressure aoKg /cd, 170
Lamination molding was carried out at .degree. C. for 90 minutes to obtain a 0.6 nm thick double-sided electrical laminate made of steel.

Comparative Example 1 A glass woven fabric having a thickness of 0.1 fl was impregnated with an epoxy resin varnish containing a curing agent so that the amount of resin after drying was 45%, and dried. Six sheets of resin-impregnated glass woven fabric were stacked. An electrical laminate with a thickness of 0.6 fl was obtained by processing in the same manner as in the example except that a laminate having adhesive-coated copper foil with a thickness of 0.035 In+ was disposed on the upper and lower surfaces of the laminate. Ta.

Comparative Example 2 47 J-ethylene resin emulsion was mixed with a thickness of 0.1
On the right side of the fin glass fabric, six sheets of m#If-impregnated glass fabric obtained by impregnating lζ and drying so that the amount of resin after drying is 45 times the fit ratio are layered, and on the upper and lower surfaces, a layer of 0.035M thick Laminated body sound molding pressure 30Kg/d with copper foil with adhesion agent respectively arranged.

It was molded at 335° C. for 60 minutes to obtain an electrical laminate having a thickness Q of 01 nM.

The performances of the electrical 8-layer boards of Examples and Comparative Examples 1 and 2 are shown in Table 1.

note * Comparative Example 1 i This is the ratio when Zoo is used.

〔Effect 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 improving high frequency characteristics while maintaining productivity.

patent issuer Matsushita Electric Works Co., Ltd.

Claims (1)

[Claims] (1) In an electrical laminate formed by integrating a laminate in which a required number of resin-impregnated substrates are provided with metal foil on the upper and/or lower surfaces, at least one of the resin-impregnated substrates has a thickness of 30 to 30 mm. 3
An electrical laminate characterized by being made of 50 micron resin-impregnated fluororesin paper.