JPS61285230A - Laminated board of glass cloth base material and resin - Google Patents

Abstract

PURPOSE:A laminated board, obtained by placing sheets of prepreg obtained by impregnating glass cloth with a barium titanate-containing resin on top of each other, laminating and molding the resultant laminates with metallic foils at the top and bottom and having a high dielectric constant, small dielectric loss tangent and improved high frequency characteristics. CONSTITUTION:A required number of prepreg sheets impregnated with a resin containing barium titanate are placed on top of each other, and, as necessary, metallic foils are placed on the top and bottom thereof. The resultant laminates are then laminated. A fluororesin is used as the resin, and tetrafluoroethylene resin, tetrafluoroethylene-perfluorovinyl ether copolymer, etc., may be preferred. Plain weave cloth is preferred for the glass cloth. 30-300pts.wt., based on 100pts.wt. resin, barium titanate having 0.015-100mu particle diameter is incorporated therewith.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a glass cloth-based resin laminate used for printed wiring boards used in electrical equipment, electronic equipment, computers, etc.

[Background technology]

Conventionally, fluororesin laminates have been used for printed wiring board laminates that particularly require high frequency properties, but laminates made by laminating and molding Gripreg, which is a glass cloth impregnated with fluororesin, have been used. Although it has excellent dimensional stability and workability, it has the disadvantage that the dielectric constant is small, making it impossible to miniaturize printed wiring boards.The laminate is made by kneading fluororesin and filler and forming a sheet.Printed wiring boards have a high dielectric constant. However, since there is no base material such as glass cloth, there are problems with large bending and bending, and a lack of workability and dimensional stability.

[Purpose of the invention]

An object of the present invention is to provide a glass cloth base resin laminate having a high dielectric constant, a small dielectric loss tangent, and excellent high frequency characteristics.

[Disclosure of the invention]

The present invention is characterized by laminating a required number of prepregs made by impregnating glass cloth with resin containing barium titanate, and further forming a laminate with metal foil arranged on the upper and/or lower surfaces as necessary. Because it is a glass cloth-based resin board, it has a high dielectric constant and a low dielectric loss tangent, which provides excellent dimensional stability and workability when processing printed wiring boards, and it has also been possible to miniaturize printed wiring boards. The present invention will now be described in detail.

Examples of resins used in the present invention include phenolic resin, cresol resin, epoxy resin, unsaturated polyester resin, melamine resin, polyimide, polybutadiene, polyamide,
Polyamideimide, poly/I/7one, polybutylene terephthalate, polyether ether/l/rton, fluororesin, etc. alone, modified products, mixtures, etc. are used, and water, methyl alcohol, acetone is used to adjust the viscosity as necessary. , cyclohexanone, styrene, and other solvents are added, but preferred examples include tetra7tethylene resin, tetra7tethylene purple olovinylethe/I' copolymer, and tetrafluoroethylene hexafluoropropylene copolymer. It is desirable to use a fluororesin such as a polymer, tetrafluoroethylene ethylene copolymer, or trifluorochloride ethylene resin. As the glass cloth base material, gaffne cloth or glass non-woven fabrics such as hachiya weave, satin weave, plain weave, open plain weave, leno weave, patterned weave, etc. can be used, but it is preferable to use plain weave glass cloth because it has heat resistance and dimensional stability. It is often desirable in terms of sex. Barium titanate is not particularly limited, but preferably has a particle size of about 0.015 to 100 microns from the viewpoint of dispersibility. The amount of barium titanate added to the resin can be varied depending on the required dielectric constant, etc., but it is preferably 30 to 300 parts per 100 parts by weight or less of the resin. is desirable. That is, if the dielectric constant is less than Tabe, it is difficult to increase the dielectric constant, and if it exceeds 300 parts, the moldability during lamination molding tends to decrease. The amount of barium titanate-containing resin impregnated into the glass cloth base material is 40 to 80% by weight.
(hereinafter simply referred to as %) is desirable. That is, if it is less than 40%, moisture resistance, drilling workability, and metal foil peeling strength tend to decrease, while if it exceeds 80%, dimensional stability tends to decrease. As the metal foil, copper foil, brass foil, aluminum foil, Niracle foil, nutless steel foil, etc. can be used, and if necessary, an adhesive layer can be provided on the metal foil.

The present invention will be explained below using examples.

Example Tetrafluoroethylene resin die version (manufactured by Daikin Industries, Ltd., trade name Borian 0, Dispersilon) 1
Glass cloth (manufactured by Nittobo Co., Ltd., product name W118 to 104
) was impregnated with a resin content of 75%, melted, and cooled to obtain a prepreg, and 8 sheets of the prepreg were stacked on top of each other, and an adhesive-coated copper foil with a thickness of 0.035 wr was placed on the bottom surface of each prepreg. Molding the laminate under a pressure of 20W.

Lamination molding was carried out at 400° C. for ω minutes to obtain a glass cloth-based fluororesin laminate having a thickness of 1.6 mm.

Conventional Example 1 A prepreg was obtained by impregnating the same glass cloth as in Example without adding barium titanate with the same tetrafluoroethylene resin Dispersilon as in Example 1 so that the resin amount was 1%, melting, and cooling. A laminate in which eight sheets of the prepreg were stacked and the same adhesive-coated copper foil as in Example 1 was placed on the bottom surface was laminated and molded in the same manner as in Example 1 to obtain a glass cloth base material with a thickness of 1.6M. A fluororesin laminated sheet metal was obtained.

Conventional Example 2 A resin obtained by adding 100 parts of barium titanate to 100 parts of polytetrafluoroethylene resin molding powder (manufactured by Daikin Industries, Ltd., trade name Polyflon, Mor/I/Ding Powder) was extruded, and then the upper and lower surfaces were extruded. thickness 0
．． Copper foils coated with a 0351W adhesive were respectively disposed and then heated and pressed at a molding pressure of 20 by' (J) for lead at 400°C to obtain a fluororesin laminate with a thickness of 1.6 m.

〔Effect of the invention〕

As clearly shown in Table 1, the performance of the fluororesin laminates of Example 1 and Conventional Examples 1 and 2 was good, confirming the superiority of the present invention. .

Chapter 1 Table

Claims (2)

[Claims] (1) It is characterized by laminating and molding a laminate in which a required number of prepregs made of glass cloth impregnated with resin containing barium titanate are layered, and metal foil is further arranged on the upper and/or lower surfaces as necessary. Glass cloth base resin laminate. (2) The glass cloth base resin laminate according to claim 1, wherein the resin is a fluororesin.