JPH04291783A - Electric metal clad laminate - Google Patents

Abstract

PURPOSE:To improve heat resistance and high frequency characteristics by employing a composite constitution wherein the inner core layer is composed of polyphenylene oxide resin and a thermosetting resin or a basic material layer impregnated therewith is applied on the surface. CONSTITUTION:The electric metal clad laminate is constituted of an inner core layer 2, surface layers 3 arranged on top and bottom thereof, and metal foils 4 applied on the outside of the surface layers. The inner core layer 2 is composed of polyphenylene oxide resin while the surface layer 3 is composed of thermosetting resin or a basic material layer impregnated therewith. The polyphenylene resin is an aromatic polyether resin having an ether bond similar to that of polyacetal. The inner core 2, the surface layers 3 and the metal foils 4 are integrated through conventional thermal press. According to the invention, a laminate excellent in heat resistance and high frequency characteristics can be produced easily.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal-clad laminate for electrical use. More specifically, the present invention relates to an electrical laminate that has excellent high frequency characteristics and can be manufactured at low cost.

0002

[Prior Art] Conventionally, electrical/electronic equipment, communication equipment,
Various metal-clad laminates have been used as printed wiring boards for computing devices and the like. In recent years, there has been an increasing demand for metal-clad laminates with good high-frequency characteristics such as dielectric constant and dielectric loss tangent. Until now, such laminated boards with good high frequency characteristics have generally been made of thermoplastic resin sheets, which have relatively good high frequency characteristics as the material itself, and which are made of metal with copper foil, etc. Tension laminates have been used.

[0003] Also, as a thermosetting resin type laminate, a copper-clad laminate using a polyether resin is known.

0004

[Problems to be Solved by the Invention] However, these conventional electrical metal-clad laminates have had several practical problems. First, in the case of metal-clad laminates using thermoplastic resin plates, although the resin itself has relatively good high frequency characteristics, it is thermoplastic and therefore has poor heat resistance.
It has the disadvantage of being easily deformed and melted during soldering. Furthermore, Teflon-based thermoplastic resin, which has attracted attention for its properties, has the disadvantage that it is extremely expensive and cannot be used as a general-purpose, inexpensive resin material. Furthermore, the use of polyether thermosetting resins has problems in that the resin itself is expensive to manufacture and the manufacturing process is complicated.

[0005]Therefore, there has been a strong demand for the realization of a metal-clad laminate for electric use with a new structure that can be manufactured at a lower cost, has good heat resistance, and has excellent high frequency characteristics. This invention was made in view of the above circumstances, and it improves the drawbacks of conventional laminates, and provides a new electrical laminate that has excellent heat resistance, good high frequency characteristics, and is inexpensive to manufacture. The purpose is to provide metal-clad laminates.

[0006]

[Means for Solving the Problems] The present invention solves the above problems by adding a thermosetting resin or a thermosetting resin-impregnated base material layer as a surface layer to an inner core layer made of polyphenylene oxide resin. The present invention provides an electrical metal-clad laminate characterized in that the present invention further includes an outermost layer of metal foil and is integrally molded therein.

That is, the present invention provides a laminate having a composite structure in which the inner core layer is made of polyphenylene oxide resin and the surface layer is provided with a thermosetting resin or a layer impregnated with a base material thereof.

[0008]

[Function] Since the laminate of the present invention has a composite structure as described above, the thermosetting resin layer of the surface layer or its base material impregnated layer supplements the heat resistance of the inner core layer, and the polyphenylene oxide By taking advantage of the excellent high-frequency properties of the resin, a metal-clad laminate with excellent high-frequency properties is realized as a whole laminate.

[0009] The use of polyphenylene oxide resin sheets facilitates their manufacture and reduces costs.

0010

[Example] As an example, the metal-clad laminate of the present invention will be explained in more detail. FIG. 1 of the attached drawings illustrates the structure of the electrical metal-clad laminate of the present invention. For example, as shown in FIG. 1, the metal-clad laminate (1) of the present invention includes an inner core layer (2), surface layers (3) disposed on the upper and lower surfaces of the inner core layer (2), and It consists of a metal foil (4) disposed on the outside, and an inner core layer (2).
) is coated with polyphenylene oxide resin, and the surface layer (3) is coated with polyphenylene oxide resin.
) uses a thermosetting resin or a thermosetting resin-impregnated base material layer.

[0011] As the polyphenylene oxide resin for the inner core layer (2), an aromatic polyether resin having an ether bond similar to polyacetal can be used as appropriate, and a modified resin sheet can be used. You can also do it. This polyphenylene oxide resin (PPO
) is, for example, the expression

0012

[Chemical formula 1]

0013], and its properties as a sheet material are: Specific gravity (ASTM D-792)
1.00~1.20 ・Hardness (ASTM
D-785) R-109/R-121
・Tensile strength (ASTM D-638)
400-580kg/cm2 ・Bending strength (ASTM D-790)
600-1000kg/cm2 ・Heat distortion temperature (ASTM D-648)
100-120℃ ・Dielectric breakdown voltage (ASTM D-149)
15.5-19.0kV/mm ・Dielectric constant
60Hz 2.40-2.75
(ASTM D-150) 1kHz
2.40-2.75
1MH
z 2.40 to 2.75, etc.,
It is characterized by good heat resistance, high frequency properties, moldability, etc.

[0014] These polyphenylene oxide resins can be disposed by any means such as a resin sheet or resin coating when forming the inner core layer (2), and the thickness of the inner core layer (2) also varies depending on the thickness of the inner core layer (2). Generally 0.5~
The range can be up to about 10 mm. For this reason, when using a resin sheet, a thin one (0.5 mm
Since it is possible to easily manufacture the laminate (1) from a thickness of approximately 10 mm to a thickness of approximately 10 mm, the manufacturing cost is also lower.

[0015] As the thermosetting resin for the surface layer (3), various conventionally known thermosetting resins can be used, such as epoxy resins, phenol resins, polyimide resins, and the like. These thermosetting resins may be impregnated into a base material such as glass cloth, glass mat, nonwoven fabric, paper, etc., and used as a composite material of the resin and the base material. The surface layer (3) made of such a thermosetting resin can generally have a thickness of about 0.03 to 1.0 mm, and can be formed by various means such as a resin sheet, prepreg, or coating. It can be formed as the surface layer (3) using.

There is no particular limitation on the type of metal foil (4) as the outermost layer. Any metal or alloy such as copper, aluminum, iron, stainless steel, etc. can be used. Among them, copper is preferred. This metal foil (4
), the thickness is preferably about 5 to 70 μm.

[0017] In order to integrate these inner core layer (2), surface layer (3) and metal foil (4), ordinary means such as pressing by heating and pressing can be used.
Conditions such as a temperature of 80° C. and a pressure of 20 to 80 kg/cm 2 can be employed. Depending on the type of material used, the conditions may be no pressure or lower pressure and low temperature. In this lamination molding, an epoxy adhesive, a rubber adhesive, or the like may be used to increase the adhesive force between layers.

In fact, the inner core layer (2) is made of polyphenylene oxide resin sheet (sunroid).

[0019]

[0020] Nonyl sheet PN7120) (thickness 2m
m), and epoxy resin (thickness 0.3 mm) is applied to the surface layer (3).
) was laminated and integrally molded using copper foil with a thickness of 10 μm as the metal foil (4) to produce a double-sided metal-clad laminate.
．． 6×10-5/℃, heat distortion temperature (ASTM D-6
48) It has a good temperature of about 110°C, and its high frequency characteristics have a dielectric constant of about 2.66 (60Hz), 2.66 (1kHz),
An electrical laminate with a good frequency of 2.60 (1 MHz) was obtained. It was easy to manufacture and inexpensive.

[0021]

According to the present invention, as explained in detail above, an electrical metal-clad laminate having good heat resistance and excellent high frequency characteristics can be provided at low manufacturing cost and with simple manufacturing.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view illustrating an electrical metal-clad laminate of the present invention.

[Explanation of symbols]

1 Metal-clad laminate 2 Inner core layer 3 Surface layer 4 Metal foil

Claims (3)

[Claims] [Claim 1] An inner core layer made of polyphenylene oxide resin, a thermosetting resin or a thermosetting resin-impregnated base material layer as a surface layer, and an outermost metal foil are arranged and integrally molded. A metal-clad laminate for electrical use. [Claim 2] The thickness of the inner core layer is 0.5 to 10 mm.
2. The electrical metal-clad laminate according to claim 1, wherein the surface layer has a thickness of 0.03 to 1.0 mm. 3. The electrical metal-clad laminate according to claim 1 or 2, which is formed by integrally disposing a polyphenylene oxide resin sheet.