JPH01150543A - Laminated plate for electric use - Google Patents

Abstract

PURPOSE:To obtain a laminated plate for electric use without poor outer appearance at the surface thereof and with superior heat resistance, by laminating a base material which is obtained by impregnating a glass cloth having the gas permeability of not more than a specified value with resin varnish not containing a filler, onto the upper and lower surfaces of a base material impregnated with resin varnish containing a filler, and further a metal foil onto the upper and/or lower surfaces of the base material. CONSTITUTION:A base material which is obtained by impregnating a glass cloth having the gas permeability not more than 4 with resin varnish not containing a filler is provided on the upper and lower surfaces of a base material impregnated with resin varnish containing a packing agent. A metal foil is further laminated on the upper and/or lower surfaces of the above-laminated member. Then, the laminated member is molded to be a laminated plate for electric use. Accordingly, the laminated plate has an improved heat resistance while the properties of the resin are maintained as they are. Moreover, since the base material made of the glass cloth having the gas permeability not more than 4 is a highly-densed material, the poor outer appearance on the surface of the laminated plate can be removed. A mineral packing agent such as calcium carbonate, aluminum hydroxide, silica, clay, glass powders, glass fiber pieces, etc. is generally used for the packing agent. As the metal foil, copper, iron, aluminum, brass, nickel, stainless steel, etc. is used singly or in mixture, or in surface treatment.

Description

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

[Background technology]

Conventionally, the thermal properties of electrical laminates have been improved by converting the resin itself of the resin-impregnated base material from, for example, phenolic resin to epoxy resin, or even polyimide resin. When unique properties are required, attempts have been made to modify the resin or add inorganic powder fillers.

Resin modification has some effect, but it is unavoidable that the properties of the resin itself change, and the addition of inorganic powder fillers tends to cause visual defects such as moth-eaten appearance on the surface of the laminate. Disadvantages [Object of the Invention] An object of the present invention is to provide an electrical laminate that has no defective appearance on the surface of the laminate and has excellent heat resistance.

[Disclosure of the invention]

In the present invention, a resin-impregnated base material made by impregnating a glass cloth with an air permeability of 4 or less with a resin varnish that does not contain a filler is arranged on the upper and lower surfaces of a resin-impregnated base material made by impregnating a resin varnish containing a filler, Furthermore, since it is an electrical laminate that is formed by laminating and molding a laminate with metal foil arranged on the upper and/or lower surfaces, it is possible to improve heat resistance while taking advantage of the unique properties of the resin. Furthermore, the appearance defects on the surface of the laminate can be eliminated by using a high-density base material with an air permeability of 4 or less.
The present invention will be explained in detail below.

The glass cloth used in the present invention is a fusu woven cloth with an air permeability of 4 or less.
This includes Fuss nonwoven fabrics, Fuss webbers, etc., and also includes blending, twisting, blending, blending, and mixing of Fuss fibers and other synthetic fibers. Resin varnishes impregnated into the base material include phenolic resin, cresol resin, epoxy resin, unsaturated polyester resin, melamine resin, polyimide, polybutadiene, polyamide, polyamideimide, polysulfone, polyphenylene sulfide, polyphenylene oxide, and polybutylene. Terephthalate, polyether ether ketone, fluorinated resin, etc. alone, modified products, mixtures, etc. are used, and if necessary, solvents such as water, methyl alcohol, acetone, fluorohexanone, styrene monomer, etc. are added to adjust the viscosity. Base materials include inorganic fibers such as glass and asbestos, and organic synthetic materials such as polyester, polyamide, carbon, polyvinyl alcohol, polyacrylic, and aramid. These include woven fabrics, non-woven fabrics, mats, paper, or combinations of these materials made of natural fibers such as cotton and cotton. Fillers include calcium charcoal, aluminum hydroxide, silica, clay, magnesium silicate, glass powder,
Inorganic fillers such as glass fiber pieces in general. The metal foil may be made of copper, iron, aluminum, brass, nickel, stainless steel, etc. alone, composite, or surface-treated, and if necessary, an adhesive layer may be provided on one side to further improve adhesiveness.

As the lamination molding, general lamination molding methods such as a multi-stage molding method, a multi-roll method, a contact pressure method, a pressureless molding method, and a double belt method can be used, and are not particularly limited.

The present invention will be explained below based on examples.

Example filler: 200 mesh aluminum hydroxide 15
Five sheets of resin-impregnated base material were prepared by impregnating an unsaturated polyester resin varnish with a 0.2 ff thick long gaffs barber so that the resin amount was 50%. On the bottom surface, one resin-impregnated base material made by impregnating a long length of fuss cloth with a thickness of 0.2N1 and air permeability 3 in an unsaturated polyester resin varnish that does not contain a filler so that the resin amount is w% is arranged. Furthermore, there is an adhesive layer on the top and bottom surfaces with a thickness of 0.
．． A long strip-shaped laminate on which long copper foils of No. 035 Wrll were arranged was laminated for minutes at 145° C. without pressure, and then cut into required dimensions to obtain an electrical laminate.

Comparative Example Processed in the same manner as in Example except that the long glass cloth with a thickness of 0.2N and an air permeability of 3 was replaced with a glass cloth with a thickness of 0.2 fl and an air permeability of 10! A laminate was obtained.

〔Effect of the invention〕

As is clear from Table 1, the performance of the electrical laminates of Examples and Comparative Examples was good, confirming the superiority of the present invention.

Table 1 Note Old open heat resistance

Claims (1)

[Claims] (1) A resin-impregnated base material made by impregnating a glass cloth with an air permeability of 4 or less with a resin varnish that does not contain a filler is arranged on the upper and lower surfaces of a resin-impregnated base material made by impregnating a resin varnish containing a filler,
An electrical laminate, characterized in that it is formed by laminating and molding a laminate having metal foil disposed on its upper and/or lower surfaces.