JPS6153332A - Production of laminate - Google Patents

Abstract

PURPOSE:To obtain a metal foil-clad laminate suppressing migration of silver, by subjecting a substrate impregnated with a thermosetting resin containing a benzotriazole to laminate molding. CONSTITUTION:A substrate impregnated with a thermosetting resin containing 1,2,3-triazole is subjected to laminate molding. A phenolic resin, epoxy resin, etc. is used as the thermosetting resin, and the amount of triazole blended is 0.03- 3wt%.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a laminate or a metal foil-clad laminate having an effect of suppressing silver migration.

2. Description of the Related Art Conventionally, conductive circuits have been formed by printing or filling holes in a printed wiring board obtained by processing a laminate or a metal foil-clad laminate with a conductive paint containing silver as a main component.

Problems to be Solved by the Invention Silver paint has good electrical conductivity, but if a laminated terminal board or printed wiring board printed with silver paint or filled with holes is used under a DC load in a high humidity atmosphere, the wiring will deteriorate. ＼There is a drawback that migration of silver, that is, migration, occurs in the wire conductor part, and short circuits are likely to occur between the conductor electrodes.

In particular, with the miniaturization and higher performance of electronic components in recent years, the silver migration resistance of laminates or metal foil-clad laminates is becoming increasingly important.

The present invention was conceived in view of the above-mentioned current situation, and provides a laminate or a metal foil-clad laminate having an effect of suppressing silver migration.

A means for solving the problem, that is, the present invention is characterized by laminated molding of a base material impregnated with a thermosetting resin to which 1,2.3 benzotriazole is added.

Thermosetting resins used in the present invention include phenol resins and epoxy resins, and base materials include cellulose base paper, woven fabrics and non-woven fabrics of glass fibers or synthetic fibers. 1 added to the thermosetting resin in the present invention
, 2.3 The content of benzotriazole is 0.03 to 3
The weight percent is preferably 0.2 to 2 weight percent.

Effect 1, 2.3 It is thought that benzotriazole easily captures water-soluble silver ions to produce an insoluble chelate compound, which has the effect of suppressing the movement of silver ions. 1,
2.3 Benzotriazole is inherently volatile, but
In the invention, since it is added and mixed with a thermosetting resin and molded with a hardness of 1, there is little risk of vaporization and it has long-term effects.

Example After adding and mixing 0.8 parts by weight of 1.2.3 benzotriazole to 100 parts by weight of tung oil-modified phenolic resin varnish (concentration 55%), this was coated with a kraft coated with a water-soluble phenolic resin initial condensate. Paper was impregnated and dried to obtain coated paper with a resin content of 48 weights. Eight sheets of this coated paper were layered with adhesive-coated copper foil 35 mμ thick on one side, and the temperature was 160°C.
A copper-clad laminate having a thickness of 1.6 mm was obtained by heating and pressing at a pressure of 90 mm for 50 minutes.

For comparison, a copper-clad laminate was obtained under the same conditions as above except that 1,2.3-benzotriazole was not added.

A test piece was prepared by printing a silver paint of test pattern 2 shown in FIG. 1 on one side of the substrate of each of the obtained laminates. Using the obtained test piece, a voltage of 50 VDC was applied at 4.0° C. in a 95% RH atmosphere,
6 each after 250.500.7501iooo hours
The presence or absence of silver migration was observed using a 0x microscope.

The results of the above test are shown in Table 1.

Effects of the Invention As is clear from Table 1, according to the present invention, a laminate having excellent migration resistance can be produced, and its industrial value is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a test piece for a silver migration test. 1 is the board, 2 is the test pattern, 3.3' is the electrode

Claims (1)

[Claims] A method for producing a laminate, comprising laminating and molding a base material impregnated with a thermosetting resin containing 1,2,3 benzotriazole.