JPH0259637B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention belongs to the field of electrical laminates for multilayer printed wiring boards used in electronic equipment, electrical equipment, calculators, computers, and the like. [Background technology] Conventional electrical laminates require a prepreg in which a laminate base material such as paper, cloth, or glass cloth is impregnated with a laminate resin varnish such as phenolic resin, epoxy resin, or unsaturated polyester resin and then dried. Multilayer printed wiring boards are made by stacking a required number of prepreg sheets, then impregnating and drying them, and then, if necessary, placing metal foil on the bottom surface of the laminate. , multi-layering, and high-speed calculation performance were in great demand and could not be met using conventional materials. [Object of the Invention] An object of the present invention is to provide an electrical laminate for a multilayer printed wiring board that has high density, multilayer structure, and excellent high-speed calculation performance. [Disclosure of the Invention] The present invention is an electrical laminate characterized in that a surface plasma-treated aromatic polyamide fiber cloth is used as a part of the base material for the laminate, and the present invention will be described in detail below. Resins for laminates used in the present invention include phenolic resin, cresol resin, epoxy resin, unsaturated polyester resin, melamine resin, polyimide, polybutadiene, polyamide, polyamideoid, polysulfon, polybutylene terephthalate, polyether ether ketone, fluorinated resin, etc. These materials are used alone, modified products, or mixtures of these materials, and if necessary, solvents such as water, methyl alcohol, acetone, cyclohexanone, and styrene are added to adjust the viscosity. Woven fabrics, nonwoven fabrics, pine, paper, or combinations of these are made of inorganic fibers, organic synthetic fibers such as polyester, polyamide, polyvinyl alcohol, and acrylic, and natural fibers such as cotton, but they are one of the substrates for laminates. It is necessary to use a surface plasma-treated aromatic polyamide fiber cloth for the parts. The plasma processing equipment is not particularly limited, but the processing conditions are a vacuum level of 10 ^-2 Torr or higher, preferably
10 ^-3 Torr. Gases used are tetrafluoroethylene, oxygen,
Carbon dioxide, etc. is good, and the frequency is 100 to 200 KHz.
The treatment is preferably carried out at 15 to 35°C for 60 minutes, and may be carried out either batchwise or continuously. The surface-treated plasma-treated aromatic polyamide fiber cloth can be disposed at any position on the laminate base material, but it is preferably disposed on the outermost side of the laminate base material. In other words, the dielectric constant required for high-speed calculation is 4×10 ⁶ Hz.
This is because there is a tendency to make it easier to make the value less than . Further, the number of the arrangement is not particularly limited, but it is preferable to use a plurality of them. Example: Glass cloth with a thickness of 0.18 mm (manufactured by Nittobo Co., Ltd.,
Product number WE18K-104), 100 parts by weight of epoxy resin (manufactured by Ciel Chemical Co., Ltd., Epicote 1001) (hereinafter simply referred to as parts), 4 parts of dicyandiamide, 0.2 parts of benzyldimethylamine, methyloxytol.
Epoxy resin varnish consisting of 100 parts with resin amount of 50 parts
Impregnated so that it becomes % by weight (hereinafter simply referred to as %),
Dried prepreg (hereinafter referred to as prepreg A)
Aromatic polyamide fiber cloth (manufactured by Kanebo Glass Fiber Co., Ltd., product name: Kevlar Cloth K120) with a thickness of 0.18 mm was placed on the top and bottom surfaces of the four sheets using a batch-type plasma processing machine at a vacuum level of 10 ^-3 Torr and the gas used. A surface plasma-treated aromatic polyamide fiber cloth obtained by plasma treatment with tetrafluoroethylene at 150KHz at 25℃ for 30 minutes was impregnated with the above epoxy resin varnish to a resin content of 50%, and dried prepreg sheets were layered one by one. Furthermore, a laminate with one copper foil layered on the outermost layer is sandwiched between molding plates at a molding temperature of 165℃ and a molding pressure of 60Kg/cm ²
Laminate molding was performed for 120 minutes to obtain an electrical laminate with a thickness of 1.6 mm. [Conventional example] An electrical laminate with a thickness of 1.6 mm was obtained by processing in the same manner as in the example except that a laminate was used in which the same six prepreg A sheets as in the example were stacked and copper foil was layered on the bottom surface. . [Effects of the Invention] The results of testing the electrical laminates obtained in the examples and conventional examples show that, as is clear from Table 1, the electrical laminates of the present invention have excellent dimensional stability and high density. The structure is compatible with multi-layering and multi-layering, and the dielectric constant can be made less than 4×10 ⁶ Hz, so it is also compatible with high-speed calculation. 【table】

Claims (1)

[Claims] 1. An electrical laminate made by laminating and molding a laminate in which a required number of prepregs are impregnated with a laminate resin and dried into a laminate base material, and if necessary, a metal foil is placed on the bottom surface of the laminate. An electrical laminate, characterized in that a surface plasma-treated aromatic polyamide fiber cloth is used as a part of the laminate base material.