JPH03182341A - Laminate for electrical use - Google Patents

Abstract

PURPOSE:To manufacture a laminate for electrical use, superior in high frequency properties, by a method wherein at least one of resin impregnated base materials is a fluorine resin mixed paper. CONSTITUTION:As for a base material, a mixed paper composed of a fluorine resin fiber such as chlorinated ethylene trifuloride resin, ethylene tetrafluoride resin, ethylene tetrafluoride propylene hexafluoride copolymerized resin, ethylene perfluorovinyl ether tetrafluoride copolymerized resin or the like, and resin fiber other than fluorine resin fiber, glass fiber, carbon fiber, metallic fiber, ceramic fiber or the like, can be used for the whole of required number of sheets of resin impregnated base material, or can be used only for the central section, or else can be used in the state of being laminated alternately with a normal base material.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Commercial Use] The present invention relates to an electrical laminate to be included in electrical equipment, electronic equipment, computer communication equipment, and the like.

[Conventional technology]

Conventionally, electrical laminates are produced by laminating a required number of sheets of resin-impregnated base material, which is made by impregnating paper or glass stone with phenolic resin, epoxy resin, or polyimide resin and drying them, and gold@foil. has been manufactured for many years, but the dielectric constant of this electrical laminate is 5 when using epoxy resin-impregnated glass cloth.
．． 0. 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 high frequency arithmetic circuits and communication fa device circuits. It was. For this reason, attempts have been made to coat kraft paper or glass woven cloth with fluorine (1) 1) impregnated with fluorine resin, or to coat the entire circumference of fluororesin-impregnated glass woven cloth, but the fluororesin liquid has not been supplied in the form of an emulsion. Therefore, in order to attach the required resin value to the base material, it takes time and effort to repeat impregnation and drying.
Since it is necessary to heat the resin to a temperature higher than the melting point of the lζ7-9 base resin, there is a problem in that high-temperature molding at 250° C. or higher is required.

[Problem that the invention seeks to solve]

As described in the prior art section, electrical laminates made of resin-impregnated base materials in which kraft paper or woven glass cloth is impregnated with epoxy resin or polyimide resin lack high frequency characteristics. On the other hand, electrical laminates made of F9-MM fat gold kraft paper and resin-impregnated base material impregnated with glass woven fabric have low productivity. In view of this, the purpose is to provide an electrical laminate with excellent high frequency characteristics while maintaining Ci and productivity tm.

Means for Solving Problem C] The present invention is an electrical laminate made by integrating a required number of resin-impregnated bases with metal foils arranged on the upper and/or lower surfaces. At least one of the base materials is resin-impregnated fluorine M111 mixed paper made by mixing fluororesin fibers and fibers other than fluororesin fibers, so it has good high frequency characteristics and is impregnated. Except for using a fluororesin as the resin, productivity can be maintained, and furthermore, the properties of the base material can be widened by mixed papermaking.Hereinafter, the present invention will be described in detail.

Examples of resins for the resin-impregnated base material used in the present invention include phenolic resin, cresol resin, epoxy VI't resin, unsaturated polyester resin, melamine resin, polyimide, polybutadiene, polyamide, polyamideimide, polysulfone, polyphenylene sulfide, Polyphenylene oxide, polybutylene terephthalate, polyether ether ketone, fluororesin, etc. alone or a modified vJ% mixture are used, and if necessary, a solvent such as water, methyl alcohol, acetone, cyclohexanone, styrene, etc. is added to adjust the viscosity. As a base material, fluorine such as trifluorochlorinated ethylene resin, tetrafluorinated ethylene resin, tetrafluorinated ethylene hexafluorinated propylene copolymer resin, tetrafluorinated ethylene perfluorovinyl ether copolymer resin, etc. Mixed paper made by mixing resin fibers with fibers such as resin fibers, glass fibers, carbon fibers, gold fibers other than fluororesin fibers, ceramic fibers, etc. is used for all of the required number of resin-impregnated base materials. Alternatively, it may be used only in the central part of the required number of laminated sheets, or only in the outermost layer, or alternatively, laminated alternately with ordinary resin-impregnated base materials, but at least one of the resin-impregnated base materials may be used. It is necessary to use it on multiple sheets.

Single, alloy, or composite foils of copper, aluminum, nickel, zinc, iron, etc. are used as the metal foil, and if necessary, an adhesive layer is provided on one side of the metal foil to further improve adhesion. You can also leave it there. As for the lamination and integration means, any method such as press, multi-stage press, multi-roll, double belt, pressureless heating, etc. can be selected, and there is no particular limitation.

The present invention will be explained below based on actual winding examples.

Example: A 100 micron thick 79 resin glass fiber mixed paper made of 50 weight of beaten ethylene perfluorovinyl ether copolymer resin fibers and 45 weight of glass fibers after drying. Six sheets of resin-impregnated fluororesin glass fiber mixed paper obtained by impregnating and drying an epoxy resin varnish containing a hardening agent were coated on the top and bottom sides of the paper to give a 0. A laminate in which adhesive-coated copper foil of Q35 was laminated was laminated for 90 minutes at 170° C. under a molding pressure of 30 KQ/d% to obtain an electrical laminate having a thickness of 0.6 mm.

Comparative Example 1 A resin-impregnated glass woven fabric obtained by impregnating a hardening agent-containing epoxy resin varnish into a glass-X woven fabric having a thickness of Q, lW so that the amount of resin after drying is approximately 45% by weight, and drying. An electrical laminate with a thickness of 0.6fi was prepared in the same manner as in the example except that a laminate was used in which adhesive-coated copper foil with a thickness of 0.035 m1EI was placed on the upper and lower cylinders of 6 sheets stacked one on top of the other. Got the board.

Comparative Example 2 47-fluorinated ethylene resin emulsion, thickness 0. 6 sheets of resin-impregnated glass cloth obtained by impregnating and drying 6 sheets of resin-impregnated glass cloth so that the amount of resin after drying becomes more than 45 times, are layered on the top and bottom surfaces of a glass woven cloth with a thickness of Q and 0,351 g with adhesive attached. N# body "lra type" pressure aoKg/7° 6 at 335°C with foil arranged
Lamination was carried out for 0 minutes to obtain an electrical laminate having a thickness of 0.6 fi.

The performances of the electrical laminates of Examples and Comparative Examples 1 and 2 are shown in Table 1.

Note *This is the ratio when Comparative Example 1 'itGo'.

〔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.

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 is made of fluororesin fiber. 1. An electrical laminate, characterized in that it is a resin-impregnated fluororesin mixed paper made by mixing with fibers other than fluororesin fibers.