JPH1034820A - Manufacture of flexible metal foil laminate having asymmetrical both side surfaces - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flexible metal foil laminate having asymmetrical both side surfaces and small warp and excellent processability. SOLUTION: This laminate is constituted to have a polyimide resin layer between two metal foil layers. In this case, to manufacture the asymmetrical both side surface flexible metal foil laminate having different two layer metal foil materials, in the case of using a metal foil, a polyimide resin adhesive sheet and a metal foil as one set, superposing a plurality of the sets, heating and press bonding them, they are superposed so that the metal foils of the same type are brought into contact with each other. Accordingly, since the metal foils of the same types of the characteristics are brought into contact with each other so that no irregular force is generated between the foils, the manufactured laminate has small warp and excellent processability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a double-sided flexible metal foil laminate used in the fields of electronics and electricity. It relates to a manufacturing method.

[0002]

2. Description of the Related Art A double-sided flexible metal foil laminate having a polyimide resin layer as an insulating layer is used as a substrate of a printed wiring board having towability in the fields of electronic equipment and medical equipment. As a double-sided flexible metal foil laminate, a copper foil on both sides is generally used. In recent years, materials having different metal foils on both sides have been increased due to diversification of applications. For example, a combination of a copper foil and a nickel foil, a combination of a copper foil and a stainless steel foil, and the like can be given. Methods for manufacturing such an asymmetric double-sided flexible laminate include a metal foil 1, a polyimide resin adhesive sheet, a metal foil 2
Is set as one set, and a plurality of sets are stacked and heated and press-bonded, and a method is generally used in which the sets are stacked in order as they are stacked.

[0003]

However, in the manufacturing method based on the above-described stacking method, since different metal foils come into contact with each other, the characteristics of the metal foils are different at the time of lamination at a high temperature. There is a problem that uneven force is applied and the manufactured laminate is warped.

[0004]

As a result of various studies, the present inventors have found that warping of a laminated plate is reduced by overlapping metal foils of the same kind so that they are in contact with each other, and have completed the present invention. Was.

That is, in a flexible metal foil laminate having a polyimide resin layer between two metal foil layers,
In manufacturing an asymmetric double-sided flexible metal foil laminate in which the materials of the two layers of metal foils are different, a set of the metal foil 1, the polyimide resin adhesive sheet, and the metal foil 2 is used, and the sets are stacked and heated and pressed. In this case, there is provided a method for producing an asymmetric double-sided flexible metal foil laminate, wherein metal foils of the same kind are overlapped so as to be in contact with each other.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION As the metal foil used in the present invention, copper, iron, nickel, chromium, molybdenum, aluminum and alloy foils based on these can be used. The thickness of the metal foil is generally 9 μm to 150 μm. The present invention relates to a method for manufacturing a laminate in which metal foils on both sides are made of different materials, and a method for manufacturing a laminate made of the same kind of metal is out of range.

[0007] The insulating layer of the asymmetric double-sided flexible metal foil laminate of the present invention is preferably a polyimide resin from the viewpoint of heat resistance. In order to form such an insulating layer, it is necessary to heat press the metal foils together with an adhesive sheet made of a polyimide resin. As the polyimide resin adhesive sheet, a single layer or three layers can be used as long as both surfaces of the sheet are thermoplastic polyimide resins. The thickness of the insulating layer depends on the intended use, but is
Generally, about 00 μm.

The method for manufacturing an asymmetric double-sided flexible metal foil laminate according to the present invention comprises the steps of: providing a mirror plate, a cushion material, a metal foil 1, a polyimide resin adhesive sheet, a metal foil between a hot plate above and below a press capable of heating and pressing. 2, a metal foil 2, a polyimide resin adhesive sheet, a metal foil 1, a metal foil 1, a polyimide resin adhesive sheet, a metal foil 2,... It is manufactured by thermocompression bonding in a time.

The asymmetric double-sided flexible metal foil laminate thus manufactured is a laminate having a small warpage and excellent workability, and is useful in the field of electronic equipment and medical equipment. Hereinafter, advantages of the present invention will be described with reference to examples.

[0010]

【Example】

Example 1 A set of 18 mm copper foil of 300 mm square, a polyimide resin adhesive sheet, and 18 μ nickel foil was set as one set, and 20 sets of copper foil and nickel foil were superimposed on each other and the cushion material was placed inside the mirror. With the face plate facing outside,
It was heated and pressed at 245 ° C. and 75 kg / cm ² × 1 hour to obtain a double-sided flexible laminate. This laminate was placed on a flat surface plate and the warpage was measured.
mm.

Example 2 A set of 18 mm copper foil of 300 mm square, a polyimide resin adhesive sheet, and 18 μ stainless steel foil was used as a set, and 20 copper foils and 20 stainless steel foils were stacked so that they came into contact with each other. Then, the mirror surface plate was sandwiched with the outside facing, and heated and pressed at 245 ° C. and 75 kg / cm ² × 1 hour to obtain a double-sided flexible laminate. When this laminate was placed on a flat surface plate and the warpage was measured, the amount of warpage at the end of the laminate was 0 mm.

Comparative Example 1 A set of 18 μm copper foil of 300 mm square, a polyimide resin adhesive sheet, and 18 μ nickel foil was set as one set, and 20 sets of copper foil and nickel foil were overlapped with a cushion material inside. 245 with the mirror plate facing outside
° C., and thermocompression bonding 75Kg / cm ² × 1 hour to obtain a double-sided flexible laminated plate. When this laminate was placed on a flat surface plate and the warpage was measured, the amount of warpage at the end of the laminate was 5 mm.

Comparative Example 2 In each case, a set of 18 mm copper foil of 300 mm square, a polyimide resin adhesive sheet, and 18 μ stainless steel foil, and 20 sets of copper foil and stainless steel foil were in contact with each other, and a cushion material was placed inside. With the mirror plate facing outside, 24
It was heated and pressed at 5 ° C. and 75 kg / cm ² × 1 hour to obtain a double-sided flexible laminate. When this laminate was placed on a flat surface plate and the warpage was measured, the amount of warpage at the end of the laminate was 3 mm.
Met.

Claims (1)

[Claims] 1. A flexible metal foil laminate having a polyimide resin layer between two metal foil layers, wherein the metal foil of the two layers is made of an asymmetric double-sided flexible metal foil laminate. Asymmetric double-sided flexible metal foil lamination characterized in that a plurality of sets are laminated so that the same kind of metal foils come into contact with each other when a plurality of such sets are laminated as a set; Plate manufacturing method.