JPH05162238A - Laminated sheet - Google Patents

Abstract

PURPOSE:To obtain a laminated sheet having a high permittivity by integrally arranging metal foil to the upper surface and/or rear surface of a laminate composed of a required number of resin impregnated base materials each obtained by impregnating a base material with a resin containing an inorg. filler with a high permittivity. CONSTITUTION:A glass fibric with a thickness of 0.2mm is impregnated with a curing agent-containing epoxy resin with alumina content of 20% in an amount of 45% to be dried. Copper foils with a thickness of 0.018mm are arranged on the upper and rear surfaces of seven epoxy resin impregnated glass fabric prepregs thus obtained to form a laminate which is, in turn, heated and pressed at 165 deg.C for 90min under molding pressure of 40kg/cm<2> by a multistage press to obtain a laminated sheet with a thickness of 1.6mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electronic equipment, electric equipment,
The present invention relates to a laminated plate used for a computer, a communication device, etc., particularly a laminated plate having a high dielectric constant.

[0002]

2. Description of the Related Art Conventionally, a ceramic substrate made of alumina, silicon nitride or the like has been used for a high dielectric constant laminated plate, but the ceramic substrate has problems in that it is multi-layered, lightweight and has high productivity. There has been a strong demand for dielectric constant laminates.

[0003]

As described in the prior art, the conventional high dielectric constant laminate has a problem. The present invention has been made in view of the above problems in the prior art, and an object of the present invention is to provide a laminate having a high dielectric constant made of a resin laminate.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides a metal foil disposed on the upper surface and / or lower surface of a required number of resin-impregnated base materials obtained by impregnating a base material with a resin containing a high dielectric constant inorganic filler. The above-mentioned object can be achieved because the laminated plate is characterized by being made into a material, and the present invention will be described in detail below.

The high dielectric constant inorganic filler-containing resin used in the present invention is phenol resin, epoxy resin, unsaturated polyester resin, polyimide resin, polyamide resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyphenylene sulfide resin, polyphenylene. Oxide resin, fluorine resin, polybutadiene resin, etc., single, modified or mixed resin containing high dielectric constant inorganic filler such as alumina, silicon nitride, or polon nitride. Can be used. The amount of the high dielectric constant inorganic filler is 10 to 85 in the resin.
It is desirable that the content is weight% (hereinafter simply referred to as%). That is, if it is less than 10%, it becomes difficult to obtain a high dielectric constant, and if it exceeds 85%, the impregnation property into the base material tends to decrease. As the substrate, inorganic fibers such as glass, ceramics, asbestos, organic fibers such as vinyl alcohol, polyimide, polyethylene terephthalate, polybutylene terephthalate, polyamide, polyphenylene sulfide, polyphenylene oxide, fluororesin and cotton, etc. Woven fabrics, non-woven fabrics, papers, and the like made from natural fibers. The amount of resin with which the base material is impregnated is preferably 35 to 70% as a resin solid content.
Further, the resin may be impregnated only with the same resin, but may be made into a plurality of impregnations such as primary impregnation and secondary impregnation with the same resin or different type resin so that the impregnation becomes more uniform. Thus, after impregnating the base material with the resin, it is dried by heating or the like, if necessary, to obtain a resin-impregnated base material. The required number of resin-impregnated base materials can be used as needed. As the metal foil, copper, aluminum, brass, nickel, iron or the like alone, an alloy or a composite foil is used, and an adhesive layer can be provided on one side of the metal foil if necessary. Thus, the above-mentioned metal foil is provided on the upper surface and / or the lower surface of the required number of resin-impregnated base materials to form a laminate. A press, a multi-roll, a double belt, a pressureless continuous method, or the like is used as the integration means, and the integration means is not particularly limited and is arbitrary.

The present invention will be described below based on examples.

[0007]

Example 1 A glass woven cloth having a thickness of 0.2 mm was coated with a curing agent-containing epoxy resin containing 20% of alumina in a resin amount of 4
0.018 mm thick on the upper and lower surfaces of seven epoxy resin-impregnated glass woven prepregs
Multi-stage press for forming a laminated body with the copper foil of
The laminate was heat and pressure molded at 165 ° C. for 90 minutes at g / cm ² to obtain a laminated plate having a thickness of 1.6 mm.

[0008]

Example 2 Example 1 except that the amount of alumina was 50%.
The same treatment as described above was performed to obtain a laminated plate having a thickness of 1.6 mm.

[0009]

Example 3 Example 1 except that the amount of alumina was 75%.
The same treatment as described above was performed to obtain a laminated plate having a thickness of 1.6 mm.

[0010]

[Comparative Example] A laminated plate having a thickness of 1.6 mm was obtained in the same manner as in Example 1 except that the amount of alumina was changed to 0%.

Table 1 shows the performance of the laminated plates of Examples 1 to 3 and Comparative Example.

[0012]

[Table 1]

[0013]

The present invention is constructed as described above. It was confirmed that a high dielectric constant resin laminated plate was obtained in the laminated plate having the structure described in the claims, and the present invention was excellent.

Claims (1)

[Claims] 1. A metal foil is arranged and formed on the upper surface and / or the lower surface of a required number of resin-impregnated base materials obtained by impregnating a base material with a resin containing a high dielectric constant inorganic filler. Laminated board.