JPS61118246A - Metal 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 [Technical Field 1] The present invention relates to a metal-clad laminate, which is a so-called composite shift laminate, which has improved punching processability.

[Background technology] When metal-clad laminates are used for printed wiring boards, so-called punching properties are often a problem. For this reason, the intermediate layer of metal-clad laminates is formed of an inorganic nonwoven fabric. A so-called compo-shift laminate, which has a lower density, is used. Although conventional component knot laminates have excellent punchability, dimensional stability, and heat resistance, prepregs made by impregnating inorganic nonwoven fabric with resin have a rough surface and are difficult to bond with metal foils. Adhesion was low, and the metal foil peeled off after punching, resulting in problems with adhesion and low reliability.

[Objective of the Invention 1 The present invention has been made in view of the above points, and its object is to have good punching properties, excellent dimensional stability and heat resistance, and to provide a prepreg and metal foil after punching. The object of the present invention is to provide a metal-clad laminate that has high adhesiveness and reliability.

DISCLOSURE OF THE INVENTION The metal foil-clad Ht laminate of the present invention consists of a required number of prepregs formed by impregnating an inorganic nonwoven fabric with a resin varnish and drying it.
It is characterized by overlapping the prepregs 1 and pasting the metal M3 on at least one side of the prepreg 1 through the resin N32.With this configuration, the above object can be achieved. Since the resin layer 2 functions as an adhesive, the metal M3 does not peel off from the prepreg 1 even after punching, resulting in good punching processability.

As the inorganic nonwoven fabric in the present invention, a nonwoven fabric made of inorganic fibers such as glass and asbestos alone or in combination can be used. This black iso nonwoven fabric is impregnated with resin varnish. The resins for resin varnish include phenolic resin, epoxy resin,
Thermosetting resins such as unsaturated polyester resins, thermoplastic resins such as polyimide resins, polyphenylene polysulfide resins, and polyamide resins can be used. This resin varnish contains inorganic particle fillers such as calcium carbonate, silica, alumina, aluminum hydroxide, titanium oxide, J-F powder, magnesium carbonate, and clay, based on 100 parts by weight of resin solid content, without impairing punching properties. about 80
It may be contained in an amount of up to 120 parts by weight to further improve insulation resistance, dimensional stability, and heat resistance during moisture absorption. Also, Kuroiso nonwoven fabric! ! Before impregnating the oil 7 varnish, it is treated with a coupling agent in advance, and the coupling agent is applied in an amount of 0.1 to 2.
0! I! m% to improve the 511 properties of the Kuroiso nonwoven fabric, and impregnated with resin varnish to obtain a2. When dried, it can improve the adhesion between Tsubameiso nonwoven fabric and resin.
It is also possible to obtain a laminate with improved insulation resistance when wet. As this coupling agent, commonly used ones can be used, and specific examples include methacrylate chromic chloride, vinyltrichlorosilane, vinyltrisbetamethoxysilane, and ganma-7minoprobyltriethoxysilane. Non-woven fabric is impregnated with υ (greasy varnish and then dried to prepare prepreg 1)
get. A required number of prepregs 1 are stacked and a metal M3 is stretched on at least one side of the prepregs 1 via a resin/[2] to obtain a metal-clad laminate A. In this case, for example, a required number of prepregs 1 are stacked between metal plates, metal foils 3 are placed on both or one side of the prepregs, and a plurality of prepregs 1 are sandwiched between hot platens as a set.
', 4O-90s+in, heated and pressurized at 150-170°C to form a metal clad laminate. As the metal foil 3, copper foil, aluminum foil, brass foil, nickel foil, stainless steel W4 foil, iron 76, etc. can be used. The back surface of the metal foil 3 is coated with an epoxy resin, a mixture of a thermosetting resin such as 7-7-l-flf resin and a thermoplastic resin such as a rubber-based resin, or a thermosetting resin such as
A resin layer 2 is formed by coating a modified material with rubber thread or a modified material made into a thermoplastic resin by graft polymerization in a range of 10 to 50 g/2, and prepreg 1 with a rough surface is coated.
The adhesion between the metal foil 3 and the metal foil 3 is improved.

Next, the present invention will be described in detail, but the present invention is not limited to the following examples.

(Example) 75 g/m2 of plus nonwoven fabric is impregnated with epoxy resin varnish and dried to produce prepreg 1a of 700 g/+*'
I got it.

Also, impregnate a 200g/+a2 glass nonwoven fabric with Evokin phase (fatty varnish), dry it, and prepare a 40011/II'' prepreg 1b.

On the other hand, butyl rubber-based t was applied to the electrolytic copper foil 3 with a thickness of 0.070 mm.
A resin layer 2 was formed by coating a modified 7 el resin at a solid content of 25 g/m'.

Next, three sheets of prepreg 1a of 700 g/+*2 are stacked, one sheet of prepreg 1b of 400 g/m2 is stacked on each side, and one sheet of the above electrolytic@M3 is stacked on top of that, sandwiched between metal plates, and pressure is applied. Lamination molding was carried out at 40 kg/c+s' and a temperature of 170° C. to obtain a 1.6 mm thick copper-clad laminate A.

A printed wiring board B was obtained by drilling holes in this knotted copper-clad laminate A. The holes were formed by punching using a mold installed in a 150L press. The adhesion between the tI4 foil 3 and the prepreg 1 was determined by inserting a nickel silver edge 5 into the punched hole 4, applying solder 6, and measuring the peel strength of the tensile land 7 in the direction of the arrow as shown in the attached figure. The results are shown in Table 1.

(Comparative example) A funbo knot laminated M board was obtained in the same manner as in the example except that no oil layer was formed on the electrolytic copper foil, and a printed M plate was obtained by performing the same hole processing and the peel strength was measured. . Results first
Shown in the table.

From the results shown in Table 1, it can be seen that in the example, the copper foil 3 did not peel off after punching, and the peel strength of the land 7 was greater than that of the comparative example. This is #I due to resin layer 2.
i! This is thought to be due to the increased adhesive strength between f3 and prepreg 1b.

[Effect of the invention 1 In the present invention, a required number of prepregs formed by impregnating an inorganic nonwoven fabric with a resin varnish and drying them are superimposed, and a metal foil is attached to at least one side of the prepregs through a resin layer. Therefore, the inorganic nonwoven fabric has good punchability and excellent dimensional stability and heat resistance, and the resin layer functions as an adhesive, improving the adhesion between prepreg with a rough surface and Group I foil. When a printed wiring board is formed by forming holes, the metal foil does not peel off from the prepreg after punching, and the punching processability is improved.

[Brief explanation of the drawing]

The attached drawings are cross-sectional views showing a method for measuring the peel strength of the land of a printed wiring board formed using the metal-clad laminate of the present invention, in which A is the metal-clad laminate, B is the printed wiring board, 1
2 is a prepreg, 2 is a resin layer, 3 is a metal foil, 4 is a punched hole, 5 is solder, 6 is a nickel silver wire, and 7 is a land.

Claims (1)

[Claims] (1) A metal-clad laminate comprising a required number of prepregs formed by impregnating and drying an inorganic non-woven fabric with a resin varnish and pasting a metal foil on at least one side of the prepregs with a resin layer interposed therebetween. .