JPS5957745A - Manufacture of aluminum-core metallic foil lined laminated board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an aluminum core metal scrap foil-clad laminate.

In recent years, as electronic devices have become smaller and more dense, the performance required for the printed circuit boards used in these devices has also increased.
This situation is becoming increasingly difficult to meet with conventional cellulose substrates or glass fabric panels. In other words, there is a growing demand for metal foil-clad laminates with less warping (high #4 Fi!I properties, rigidity, and conductivity). , entered Ji'iJA board,
For example, aluminum core or iron core metal ``single-layer plates'' have been provided, and have begun to be applied to power supply boards for communication equipment, cell connection boards for solar cells, etc.).However, conventional aluminum core metal τ" There was a problem with the adhesion strength between the gold 11 (1 foil) and the aluminum plate with a surface oxide film layer.As a way to solve this problem, we tried to bond between the copper foil and the aluminum plate with a surface oxide film layer. 1) A method was used in which one ply of thermosetting resin-impregnated fiber (hereinafter referred to as lever film) was pressed into a paper or glass cloth base material and bonded under heat and pressure. Since the aluminum core metal scrap foil-clad laminate manufactured by this method uses the above-mentioned lever film, it has the following drawbacks.

(1) Large warpage.

(2) Poor thermal conductivity.

(3) iJ heat resistance, resistance to 21' opening 111°.

(4) Manufacturing time is large.

(5) It is expensive.

The present invention aims to improve these drawbacks, and aims to provide an aluminum-core metal bent foil-clad JJ board that is less warped, has good heat resistance, and is inexpensive.

In order to achieve the above object, the present invention overlaps an adhesive 3 (; The formed body is inserted into a mirror plate 50, and the metal foil 2 with the adhesive 3 and the aluminum plate 1 having the surface oxidized film layer are bonded together under heating and pressure, and then cooled to form a mirror plate. 5 and the rubber-like elastic body 4 is removed (characterized by passing through a process. 1) Therefore, the metal foil bone cement layer alone can be used as an aluminum plate having a surface oxidized film layer without using a lever film. Gold F4 foil can be bonded, and an air layer is left between the thin metal foil adhesive layer and the aluminum plate, which has an oxidized film layer on one side, by utilizing the cushioning force of the rubber-like elastic body when heated and pressurized. A good contact 7°1 is made without any trouble.

In carrying out the present invention, it is preferable that the aluminum plate 1 having a surface oxidized film layer has an oxidized film formed on its surface by, for example, sulfuric acid treatment and has a thickness of at least 6 μm or more. If it is less than 6μ, there are problems such as insufficient adhesion with metal foil, reduced insulation when etching the metal foil and using it as a circuit board, and corrosion of the aluminum plate by the etching solution. The metal foil 2, for example, copper foil, can be used for commercially available copper-clad laminates, and the adhesive surface with the aluminum plate 1 is an adhesive 3 used for general phenolic resin laminates.
For example, a nitrile-modified phenol resin is coated to a thickness of 20 to 30 μm. The comb-like elasticity (wood 4) that is in contact with the surface of the metal foil 2 does not adhere to the metal foil 2 even under heat and pressure, has a smooth surface, does not cause wrinkles or unevenness on the metal foil 2, It is necessary to select a material that provides a uniform pressure distribution during rolling, and silicone comb sheets, butyl rubber sheets, etc. are particularly suitable.
The thickness is 0 considering thermal conductivity during molding, cost, etc.
5 to 2% is desirable. If it is less than 0.05%, the cushioning force of the comb-like elastic body will be insufficient, and the resulting aluminum cored metal scrap foil-clad laminate may lack metal foil peel strength and solder resistance. On the other hand, if it exceeds 2%, it is added! ! II
+: There is a risk that the heat conduction during molding will decrease and the resulting aluminum core metal foil-clad laminate will become warped.

In addition, using a generally known method for manufacturing thermosetting resin laminates, for example, an aluminum plate with a 91 fl. In the method of placing and forming, a uniform pressure distribution cannot be obtained and air is trapped, and the adhesive force between the gold layer foil and the aluminum plate is uneven and insufficient, making it impossible to produce a laminate with the desired characteristics.

Next, the present invention will be explained in detail.

Example Aluminum plate (plate J';) whose surface was subjected to positive frame oxidation treatment with a thickness of 6 μm (plate J'): 1.5%, aluminum material JIS If4000 A1050P-824, surface treatment JIS I (J to 8601-1974)゛ru) no 1
A 35μη shaved foil with a contact agent on the side was placed so that the adhesive side was in contact with the aluminum plate, and then a 10% thick silicone comb sheet was placed on the surface of the copper foil as a comb-like elastic body.
Neta v,,kn face plate 1'! j! Insert it into the temperature 160℃
, Pressure 100 K9/Crtl 60 minutes 11~
, no pressure. Thereafter, it was cooled and the silicone comb sheet was removed. Obtained aluminum core 1.,j tension R/j
The performance of the board is as shown in Table 1.

Comparative Example 1 An aluminum plate similar to the example in which the surface was subjected to oxidation removal treatment with a thickness of 6 μm was overlaid with phenol resin-impregnated paper (prepreg) on one side, and a 35 μ-thick copper foil with adhesive was placed on top of this. The mirror plates were placed on top of each other and molded under the same conditions as in the example. The performance of the obtained aluminum core tensile mP board was the first.
It was as shown in the table.

Comparative Example 2 Using the same aluminum l-plate as in the example, which had been subjected to surface treatment of 6μ thick lI+, l polarization t, and +6 film, a 35μ thick copper foil with adhesive was attached on one side of the aluminum plate. It was directly inserted between mirror plates without using a comb-shaped elastic body and heated and pressurized under the conditions of the example and studs. The performance of the obtained aluminum core copper clad laminate is as shown in iC2 in Table 1, and the warpage is 5θOX etched to a residual fly rate of 4096.
The dimension a shown in FIG. 2 was measured for a 500% sample piece. The solder resistance was shown by the range of measured values of three 20×20 sample pieces.

As mentioned above, the aluminum core metal foil cladding according to the present invention "
The single-layer board has the following characteristics: (1) It has less warpage when used as a circuit board, and there are no problems when mounting it as a circuit board for high-density electronic equipment.
There is no risk of cell destruction due to warping even if cells are pasted.

(2) It has excellent heat resistance, half-opening resistance, and strength, and there is no fear of circuit peeling when mounting two-piece components due to heat treatment on a circuit board.

(3) In addition, since the comb-shaped elastic body can be used repeatedly, the industrial value of the present invention is extremely high, such as the introduction of aluminum core metal foil-clad laminates, which have a simple and inexpensive manufacturing process. It is what it is.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the t&formation during manufacturing of the aluminum core R foil-clad laminate according to the present invention, and FIG. 2 is the fy! It is an explanatory view showing the measurement position of the warp of the layered plate. 1 is an aluminum plate, 2 is a metal foil, 3 is an adhesive, 4 is a rubber-like elastic body, and 5 is a mirror plate Patent applicant

Claims (1)

[Claims] Apply adhesive IXJ metal foil to an aluminum plate having a surface oxidation treatment film layer, then sandwich the slide formed by placing a rubber-like elastic body on the metal foil side between mirror plates, and apply the adhesive under heat and pressure. (i) An aluminum core metal foil clad rI scrap board characterized by a step of bonding a metal foil and an aluminum plate having a surface oxidized skin layer, and then cooling and removing the specular plate and the comb-shaped elastic body. Manufacturing method.